Desktop coffee machine

Abstract

The invention relates to a desktop coffee machine which is technically characterized by comprising a table top, an electric kettle arranged on the table top, an extraction head and a water pump, the extraction head is provided with a water return channel capable of enabling water to flow back into the electric kettle, and the water pump is provided with a water outlet pipeline capable of pumping out water in the electric kettle and a water conveying pipeline capable of conveying the pumped water into the extraction head. The extraction head is internally provided with a water cavity communicated with the water supply pipeline, a valve element cavity capable of being communicated with the water cavity and the water return channel, and a coffee brewing cavity capable of being communicated with the valve element cavity. The valve core is used for controlling water flow between the coffee brewing cavity and the valve core cavity and between the water return channel and the valve core cavity, and the control switch is used for driving the valve core to control water flow disconnection or connection between the coffee brewing cavity and the valve core cavity and control water flow connection or disconnection between the water return channel and the valve core cavity. The coffee maker is simple in structure, and the extraction head can be preheated through backwater of the backwater channel during coffee making, so that the coffee making temperature is accurately controlled.

Description

Technical Field

[0001] The present invention relates to an electric coffee machine.

Background Art

[0002] People who love drinking tea usually set up a tea brewing machine on the desktop or tea table, etc. A common tea brewing machine is like the one with the patent number 202222654928.4 and the name of a base and a tea brewing machine. A water kettle is set on the tea table, and the general standard size of the tea table is about 20*37 cm. The water kettle and the tea table are plugged in through a coupler, and water is discharged through a water discharge device. The water discharge device pumps water from a water pump to supply water to the water kettle. There is also another kind of tea brewing machine on the market, like the one with the patent number 202323380575.4 and the name of a cooked water tea brewing machine, which pumps the heated water in the water storage container to the tea leakage device to make tea, and the water flows out through the connector in the coupler. However, there is no such base-type brewer that can be used to brew coffee on the market.

[0003] Because coffee is a bit different from tea, the taste of coffee has a great relationship with the brewing water pressure and temperature. For the coffee machines currently on the market, a common one has the patent number 201310291519.5 and the name of a two-in-one coffee machine, which supplies water by pumping water with a water pump, and the pressure is achieved through the sealing structure of the pressure coffee funnel. When brewing, the water pump pumps the water in the water tank for brewing. The taste of coffee has a certain relationship with the water temperature. Generally, coffee is brewed with water at about 93°C for the best taste. The water temperature in the water kettle is easy to control, but when the water is pumped to the brewing head, the water temperature changes. Therefore, the water temperature cannot be controlled when brewing coffee.

Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a tabletop coffee machine with a simple structure, convenient for tabletop installation and use, and capable of preheating the extraction head.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A tabletop coffee machine, including a tabletop;

[0007] An electric kettle, which is arranged on the tabletop;

[0008] An extraction head, which is arranged on the tabletop, and a water return pipe capable of returning water to the electric kettle is arranged on the extraction head;

[0009] A water pump, which is arranged on the tabletop. An outlet pipe capable of pumping water out of the electric kettle and a water supply pipe for sending the pumped water into the extraction head are arranged on the water pump. A water cavity communicated with the water supply pipe, a valve core cavity capable of communicating with the water cavity, a coffee brewing cavity capable of communicating with the valve core cavity, and a water return channel capable of communicating the valve core cavity and the water return pipe are arranged in the extraction head;

[0010] A valve core that controls the on-off of water flow between the coffee brewing chamber and the valve core chamber and between the water return channel and the valve core chamber;

[0011] A control switch that drives the valve core to control the disconnection or connection of the water flow between the coffee brewing chamber and the valve core chamber and the connection or disconnection of the water flow between the water return channel and the valve core chamber.

[0012] A desktop coffee machine as described above, characterized in that: a rotating arm is provided on the desktop, one end of which is rotatably provided on the desktop, and a brewing seat body is provided at the bottom of the extraction head, and the brewing seat body is rotatably provided at the other end of the rotating arm.

[0013] A desktop coffee machine as described above, characterized in that: the water outlet pipe includes a front water delivery section connected to an electric kettle and a rear water delivery section connected to the extraction head, the water pump is provided on the front water delivery section, the water return channel includes a front water return section that can direct water to the electric kettle and a rear water return section communicated with the valve core chamber, an inlet connection channel and a water return connection channel are provided on the rotating arm, first and second transfer chambers communicated with the inlet connection channel and the water return connection channel are respectively provided at both ends of the rotating arm, a first adapter is rotatably inserted into the first transfer chamber, and a first water inlet communication groove and a first water return communication groove for sealingly separating the first transfer chamber up and down are provided on the first adapter, the first water inlet communication groove is communicated with the inlet connection channel, the first water return communication groove is communicated with the water return connection channel, a first water inlet transfer channel for communicating the front water delivery section and the first water inlet communication groove and a first water return transfer channel for communicating the front water return section and the first water return communication groove are provided on the first adapter, the lower end of the first adapter penetrates into the desktop to communicate the first water inlet transfer channel with the front water delivery section and the first water return transfer channel with the front water return section; a second adapter is rotatably inserted into the second transfer chamber, and a second water inlet communication groove and a second water return communication groove for sealingly separating the second transfer chamber up and down are provided on the second adapter, the second water inlet communication groove is communicated with the inlet connection channel, the second water return communication groove is communicated with the water return connection channel, a second water inlet transfer channel for communicating the rear water delivery section and the second water inlet communication groove and a second water return transfer channel for communicating the rear water return section and the second water return communication groove are provided on the second adapter, and the upper end of the second adapter penetrates into the brewing seat body for connecting the second water inlet transfer channel with the rear water delivery section and the second water return transfer channel with the rear water return section.

[0014] A desktop coffee machine as described above, characterized in that: a brewing seat body is provided on the desktop, a vertically extending support rod is provided on the brewing seat body, and the extraction head is detachably clamped at the upper end of the support rod.

[0015] A desktop coffee machine as described above, characterized in that: a clamping seat is provided on the extraction head, a connecting rod is provided at the upper end of the support rod, a first trapezoidal block is provided at one end of the connecting rod, and a first trapezoidal slot for the first trapezoidal block to be inserted into is provided at the upper end of the support rod. A first locking block slot communicating with the first trapezoidal slot is further provided at the upper end of the support rod. A first locking slot is provided on the first trapezoidal block, and a first convex buckle that can be inserted into the first locking slot is inserted into the first locking block slot; a second trapezoidal block is provided on the clamping seat, and a second trapezoidal slot for the second trapezoidal block to be inserted into and a second locking block slot communicating with the second trapezoidal slot are provided at the other end of the connecting rod. A second locking slot is provided on the second trapezoidal block, and a second convex buckle that can be inserted into the second locking slot is provided in the second locking block slot.

[0016] A desktop coffee machine as described above, characterized in that: a receiving groove is provided below the extraction head on the brewing seat body.

[0017] A desktop coffee machine as described above, characterized in that: the valve core is provided in the valve core cavity, the control switch is provided on the extraction head and one end extends into one side of the valve core to drive the valve core, and the other end extends out of the water cavity.

[0018] A desktop coffee machine as described above, characterized in that: the control switch drives the valve core to move axially along the valve core cavity. A sealing ring that can move with the valve core and can control the on-off of the water flow between the valve core cavity and the coffee brewing cavity and the on-off of the water flow between the valve core cavity and the return water channel is provided on the valve core. When the sealing ring moves to connect the water flow between the coffee brewing cavity and the valve core cavity, the water flow between the valve core cavity and the return water channel is disconnected. When the sealing ring moves to disconnect the water flow between the valve core cavity and the coffee brewing cavity, the water flow between the control valve core cavity and the return water channel is connected.

[0019] The extraction head is provided with a positioning pin extending into the valve core cavity. The valve core is provided with a first positioning edge blocked by the positioning pin when the valve core moves to connect the coffee brewing cavity and the valve core cavity and a second positioning edge blocked by the positioning pin when the valve core moves to connect the return water channel and the valve core cavity.

[0020] A tabletop coffee machine as described above, characterized in that: a valve core inner cavity extending along the length direction of the valve core and having one end capable of communicating with the water in the water supply cavity of the valve core cavity is provided inside the valve core; the sealing ring divides the valve core cavity into a first cavity capable of communicating with the coffee brewing cavity and a second cavity capable of communicating with the return water channel along the length direction; first communication holes communicating the first cavity with the valve core inner cavity and second communication holes communicating the second cavity with the valve core inner cavity are provided on the valve core wall body at intervals along the length direction of the valve core; the first communication hole and the first communication hole are respectively on both sides of the sealing ring; when the sealing ring moves to a position where the water flow between the first cavity and the coffee brewing cavity is communicated, the sealing ring disconnects the water flow between the second cavity and the return water channel; when the sealing ring moves to a position where the water flow between the first cavity and the coffee brewing cavity is disconnected, the sealing ring communicates the water flow between the second cavity and the return water channel.

[0021] A tabletop coffee machine as described above, characterized in that: a worm segment is provided on the valve core; the control switch includes a rotating head provided outside the extraction head, and a worm gear capable of extending into one side of the valve core and meshing with the worm segment is provided on the rotating head.

[0022] A tabletop coffee machine as described above, characterized in that: the return water channel includes an outer return water pipe provided outside the extraction head and a return water joint provided inside the extraction head; a communication groove communicating the return water joint with the valve core cavity is provided inside the extraction head; the upper end of the communication groove extends towards the top of the water cavity; the top of the communication groove is higher than the return water joint and the valve core cavity; both ends of the communication groove extend downwards to communicate with the return water joint and the valve core cavity respectively.

[0023] A tabletop coffee machine as described above, characterized in that: a pressure gauge cavity capable of communicating with the water cavity is provided on the extraction head; a pressure measuring column extending towards the top of the water cavity and close to the top of the water cavity is provided on the pressure gauge cavity; a pressure measuring communication hole communicating the pressure gauge cavity and the water cavity is provided at the top of the pressure measuring column.

[0024] A tabletop coffee machine as described above, characterized in that: a pressure relief cavity capable of communicating with the water cavity is provided on the extraction head; a pressure relief column extending towards the top of the water cavity and close to the top of the water cavity is provided on the pressure relief cavity; a pressure relief communication hole communicating the pressure relief cavity and the water cavity is provided at the top of the pressure relief column; a pressure relief valve capable of sealing the pressure relief cavity is provided inside the pressure relief cavity; a pressure relief switch capable of pushing the pressure relief valve to open and allowing the air flow to flow out of the extraction head is provided on the extraction head.

[0025] A tabletop coffee machine as described above, characterized in that: an inflation cavity capable of communicating with the water cavity is provided on the extraction head; an inflation column extending towards the top of the water cavity and close to the top of the water cavity is provided on the inflation cavity; an inflation communication hole communicating the inflation cavity and the water cavity is provided at the top of the inflation column; an inflation check valve capable of controlling the one-way flow of air from the inflation cavity to the water cavity is provided inside the inflation cavity.

[0026] A tabletop coffee machine as described above, characterized in that: the bottom of the electric kettle and the tabletop are respectively plugged through a coupler, the water outlet pipe passes through the coupler and communicates with the inside of the electric kettle, and a first water outlet check valve for controlling the one-way flow of water from the inside of the electric kettle to the water pump is arranged at one end of the water outlet pipe penetrating into the electric kettle.

[0027] A tabletop coffee machine as described above, characterized in that: the water pump includes a gear pump and a diaphragm pump connected to one end of the gear water pump for water inlet, the water outlet pipe is connected to the other end of the diaphragm pump, a second water outlet check valve for controlling the one-way flow of water from the inside of the electric kettle to the water pump is arranged in the middle of the water outlet pipe, a pressure relief pipe is arranged between the second water outlet check valve and the diaphragm pump on the water outlet pipe, and a pressure relief water check valve for controlling the outward discharge of water from the pressure relief pipe is arranged on the pressure relief pipe.

[0028] A tabletop coffee machine as described above, characterized in that: a bubble blocking cover capable of vertically blocking air bubbles is arranged at one end of the water outlet pipe penetrating into the electric kettle.

[0029] A tabletop coffee machine as described above, characterized in that: a water supply elbow pipe that vertically extends and can supply water to the electric kettle is arranged on the tabletop, the end of the water supply elbow pipe is above the electric kettle, an insertion port for inserting one end of a return water pipe is arranged on the return water channel, the other end of the return water pipe is connected to the water supply elbow pipe, a water supply pipe is connected to the return water channel, a water pump capable of pumping water to the return water channel and a water supply check valve for controlling the one-way flow of water from the water pump to the return water pipe are connected to the water supply pipe, and a return water check valve for controlling the one-way flow of water to the side of the electric kettle is arranged on the return water channel.

[0030] A tabletop coffee machine as described above, characterized in that: a water storage tank is arranged in the middle of the water outlet pipe between the electric kettle and the water pump, the water pumping end of the water pump is connected to the bottom of the water storage tank, and the water outlet pipe is connected to the top of the water storage tank.

[0031] A tabletop coffee machine, characterized in that:

[0032] including a tabletop;

[0033] an electric kettle, which is arranged on the electric kettle;

[0034] an extraction head, which is arranged on the tabletop, and a return water channel capable of returning water to the inside of the electric kettle is arranged on the extraction head;

[0035] A water pump is provided on the tabletop. An outlet pipe capable of pumping water out of the electric kettle and a water supply pipe for sending the pumped water into the extraction head are provided on the water pump. A water cavity communicating with the water supply pipe and a return water channel, a valve core cavity capable of communicating with the water cavity, and a coffee brewing cavity capable of communicating with the valve core cavity are provided inside the extraction head;

[0036] A valve core is provided in the valve core cavity to control the on-off of the water flow between the coffee brewing cavity and the valve core cavity;

[0037] A control switch is provided on the extraction head to drive the valve core to control the disconnection or connection of the water flow between the coffee brewing cavity and the valve core cavity;

[0038] A control valve is provided on the return water channel to control the on-off of the water flow between the return water channel and the water cavity.

[0039] The beneficial effects of the present invention are as follows: An electric kettle, an extraction head, and a water pump are arranged on the tabletop, which is convenient for installation on the tabletop and convenient for brewing coffee after the water is heated. By setting a return water pipe, when the control switch drives the valve core to control the disconnection of the water flow between the coffee brewing cavity and the valve core cavity and the connection of the water flow between the return water channel and the valve core cavity, when the water in the kettle reaches the set temperature, the water pump starts to pump water. After the water enters the water cavity, it flows out from the return water channel through the valve core cavity. In this way, the hot water can preheat the water cavity and raise the temperature inside the water cavity. When the preheating is completed, through the control switch, the coffee brewing cavity is communicated with the valve core cavity, and the return water channel is disconnected from the valve core cavity. The water brews coffee through the coffee brewing cavity. At this time, the water temperature for brewing coffee is approximately the same as the water temperature at the set temperature. In this way, accurate temperature control can be achieved, and the coffee taste can be improved; By setting a rotating arm, the position can be rotated when brewing coffee. For example, it can be rotated away from the tabletop to prevent the kettle on one side from blocking. There is not only more space for brewing coffee, but also it does not block the taking and placing of coffee cups, which is convenient to use; The extraction head is detachably installed, which is convenient to remove, carry and use outdoors, and is also convenient for cleaning and assembling; By setting a communication groove, the water level in the water cavity can be raised, and the air in the water cavity can be reduced; An inflation cavity is provided on the extraction head. In this way, the water cavity can be pressurized by inflation, without the need to pressurize through a water pump, which is convenient to use and can also be used outdoors; A first outlet check valve is provided on the outlet pipe to prevent the electric kettle from leaking water, and a second outlet check valve is provided to prevent water from flowing back into the electric kettle; By setting a bubble blocking cover, the water bubbles during water heating are blocked from the upper end of the outlet pipe, and the bubbles are guided to flow along the side of the electric kettle.

Description of the Drawings

[0040] Figure 1 It is a perspective view of the first embodiment of the present invention;

[0041] Figure 2 It is a rear view of the first embodiment of the present invention:

[0042] Figure 3 It is a bottom view of the first embodiment of the present invention;

[0043] Figure 4 It is a cross-sectional view of the electric kettle part in the first embodiment of the present invention;

[0044] Figure 5 It is a perspective view of the extraction head in the first embodiment of the present invention;

[0045] Figure 6 It is a cross-sectional view of the extraction head in the first embodiment of the present invention;

[0046] Figure 7 It is an exploded view of the extraction head in the first embodiment of the present invention;

[0047] Figure 8 It is a partial exploded view of the extraction head in the first embodiment of the present invention;

[0048] Figure 9 It is a perspective view of the components of the extraction head in the first embodiment of the present invention;

[0049] Figure 10 It is a front view of the assembly of the tabletop, rotating arm, and brewing seat body in the first embodiment of the present invention;

[0050] Figure 11 It is a cross-sectional view of the assembly of the tabletop, rotating arm, and brewing seat body in the first embodiment of the present invention;

[0051] Figure 12 It is a perspective view of the assembly of the rotating arm and the brewing seat body in the first embodiment of the present invention;

[0052] Figure 13 It is a perspective view of the rotating arm in the first embodiment of the present invention;

[0053] Figure 14 It is an exploded view of the rotating arm in the first embodiment of the present invention;

[0054] Figure 15 It is a cross-sectional view of the rotating arm in the first embodiment of the present invention;

[0055] Figure 16 It is a perspective view of the components of the rotating arm in the first embodiment of the present invention;

[0056] Figure 17 It is a cross-sectional view of the first adapter in the first embodiment of the present invention;

[0057] Figure 18 It is a cross-sectional view of the second adapter in the first embodiment of the present invention;

[0058] Figure 19 It is a perspective view of the valve core in the first embodiment of the present invention;

[0059] Figure 20 It is a rear view of the second embodiment of the present invention:

[0060] Figure 21Stereogram of components of the extraction head in the second embodiment of the present invention:

[0061] Figure 22 Cross-sectional view of the extraction head in the second embodiment of the present invention;

[0062] Figure 23 Stereogram of the third embodiment of the present invention.

Specific Embodiment

[0063] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0064] As Figures 1 to 19 shown, a tabletop coffee machine, the name coffee machine is not only used for brewing coffee, but also applicable to brewing tea, tangerine peel, etc. It includes a tabletop 1, which can be embedded in a tea table. An electric kettle 2, an extraction head 3, and a water pump 4 are provided on the tabletop 1. The extraction head 3 is on one side of the electric kettle 2. The water pump 4 can be installed at the bottom of the tabletop 1. The water pump 4 includes a gear pump 46 and a diaphragm pump 47 connected to the water inlet end of the tooth water pump 4. The water pressure can be adjusted by adjusting the rotation speed of the gear pump 46, thereby adjusting the pressure in the extraction head 3. The diaphragm pump 47 is used to increase the water flow rate. An outlet pipe 41 for pumping the water in the electric kettle 2 and a water supply pipe 42 for sending the pumped water into the extraction head 3 are provided on the water pump 4. The outlet pipe 41 is connected to the diaphragm pump 47, and the water supply pipe 42 is connected to the gear pump 46. The electric kettle 2 can be connected and heated by means of a coupler. A return water pipe 43 for returning the water to the electric kettle 2 is provided on the extraction head 3. A water cavity 31 communicating with the water supply pipe 42, a valve core cavity 32 capable of communicating with the water cavity 31, a coffee brewing cavity 33 capable of communicating with the valve core cavity 32, and a return water channel 34 capable of communicating the valve core cavity 32 and the return water pipe 43 are provided in the extraction head 3. The valve core cavity 32 is in the water cavity 31. The bottom of the coffee brewing cavity 33 is open. A multi-layer filter screen is provided in the liquid outlet of the coffee brewing cavity 33, and a funnel assembly can be clamped. Coffee is placed in the funnel assembly. A valve core 5 is provided in the valve core cavity 32. One or more valve cores 5 can be provided. In this embodiment, only one valve core 5 is provided in the valve core cavity 32. The valve core 5 can control the water flow on and off between the coffee brewing cavity 33 and the valve core cavity 32. A control switch 6 for driving the valve core 5 to control the water flow between the coffee brewing cavity 33 and the valve core cavity 32 to be disconnected or connected and to control the water flow between the return water channel 34 and the valve core cavity 32 to be connected or disconnected is provided on the extraction head 3. One control switch 6 is provided corresponding to the valve core 5. The control switch 6 has two gears. One gear is that the water flow between the coffee brewing cavity 33 and the valve core cavity 32 is disconnected. At this time, the water flow between the return water channel 34 and the valve core cavity 32 is connected to preheat the extraction head 3; the other gear is that the water flow between the coffee brewing cavity 33 and the valve core cavity 32 is connected. At this time, the water flow between the return water channel 34 and the valve core cavity 32 is disconnected to brew coffee.

[0065] In order to facilitate the use when the size of the tabletop 1 reaches the standard size of the tea table, a rotating arm 11 is provided on the tabletop 1, with one end rotatably arranged above the tabletop 1. The rotating arm 11 is approximately flat and waist-shaped. A brewing seat body 7 is provided at the bottom of the extraction head 3. The brewing seat body 7 can be provided with a pressure regulating switch for controlling the pressure of the water pump 4. The brewing seat body 7 is rotatably arranged at the other end of the rotating arm 11. In this way, the rotating arm 11 can rotate out relative to the tabletop 1, so that the rotating arm 11 can be unfolded and the brewing seat body 7 can be rotated away from the tabletop 1. For convenient rotational installation, bearings can be used.

[0066] To simplify the installation and use of the water pipe and make the coffee machine more concise, the water outlet pipe 41 includes a front water delivery section 48 connected to the electric water kettle 2 and a rear water delivery section 49 connected to the extraction head 3. The water pump 4 is provided on the front water delivery section 48. The water return channel 34 includes a front water return section 341 that can direct water to the electric water kettle 2 and a rear water return section 342 connected to the valve core cavity 32. The front water delivery section 48, the rear water delivery section 49, the front water return section 341, and the front water return section 341 do not refer to a single section or a single pipe. For the convenience of description, with the swivel arm 11 as the demarcation line, they can be multiple sections. The swivel arm 11 is provided with a water inlet connection channel 17 and a water return connection channel 18. The water inlet connection channel 17 and the water return connection channel 18 are on the same horizontal line, so that the thickness of the swivel arm 11 can be reduced except at both ends. The two ends of the swivel arm 11 are respectively provided with a first transfer cavity 101 and a second transfer cavity 102 connected to the water inlet connection channel 17 and the water return connection channel 18. The first transfer cavity 101 and the second transfer cavity 102 are hollow cylindrical. A first adapter 103 is rotatably inserted into the first transfer cavity 101. The first adapter 103 is provided with a first water inlet communication groove 104 and a first water return communication groove 105 that can seal and separate the first transfer cavity 101 up and down. To increase the sealing performance, multiple such up and down sealing grooves can be provided, but they do not have the function of passing water. The first water inlet communication groove 104 and the first water return communication groove 105 are arranged up and down on the outer circumference of the first adapter 103. The edges of the annular grooves of the first water inlet communication groove 104 and the first water return communication groove 105 are pressed against the inner wall of the first transfer cavity 101 for sealing, so that the first transfer cavity 101 is independent and not connected. The first water inlet communication groove 104 is connected to the water inlet connection channel 17. One end of the water inlet connection channel 17 is opened to communicate with the first transfer cavity 101, and the opening position of one end of the water inlet connection channel 17 is within the first water inlet communication groove 104. The first water return communication groove 105 is connected to the water return connection channel 18, and its connection principle is the same as the connection structure between the first water inlet communication groove 104 and the water inlet connection channel 17. Since there is a certain height difference between the first water inlet communication groove 104 and the first water return communication groove 105 up and down. In this embodiment, the first water inlet communication groove 104 is higher than the first water return communication groove 105, but the water inlet connection channel 17 and the water return connection channel 18 are on the same horizontal line. To make up for the height difference, the end of the water return connection channel 18 is bent downward and then connected to the first transfer cavity 101.The first adapter 103 is provided with a first water inlet transfer channel 106 that connects the front section 48 of water supply and the first water inlet connection groove 104, and a first water return transfer channel 107 that connects the front section 341 of water return and the first water return connection groove 105. The lower end of the first adapter 103 penetrates into the tabletop 1 so that the first water inlet transfer channel 106 communicates with the front section 48 of water supply and the first water return transfer channel 107 communicates with the front section 341 of water return. The lower end of the first adapter 103 penetrates into the tabletop 1. The lower end communication hole of the first water inlet transfer channel 106 is exposed at the lower end of the first adapter 103 for connecting with the front section 48 of water supply, and the first water return transfer channel 107 is exposed at the lower end of the first adapter 103 for connecting with the front section 341 of water return. When rotating, the brewing seat body 7 is pushed, and the brewing seat body 7 rotates around the first adapter 103 together with the rotating arm 11, so that the brewing seat body 7 rotates out of the tabletop 1. The lower end of the first adapter 103 penetrates out of the first transfer cavity 101 and can be fixed on the tabletop 1 by bolts or the like. The lower end of the first adapter 103 and the end of the rotating arm 11 can be relatively rotatably abutted. The upper end of the first adapter 103 penetrates upward out of the first transfer cavity 101, and a flange and an elastic washer can be provided between the upper end of the first adapter 103 and the upper end of the rotating arm 11. The second transfer cavity 102 is relatively rotatably inserted with a second adapter 111. The second adapter 111 is provided with a second water inlet connection groove 112 and a second water return connection groove 113 that can seal and separate the upper and lower parts of the second transfer cavity 102. In this embodiment, the second water inlet connection groove 112 is above and the second water return connection groove 113 is below, and the sealing structure is the same as that of the first water inlet connection groove 104 and the first water return connection groove 105.The second water inlet communication groove 112 is communicated with the water inlet connection channel 17. In order to make up for the height difference, the other end of the water inlet connection channel 17 is bent upward and then communicated with the second water inlet communication groove 112. The second water return communication groove 113 is communicated with the water return connection channel 18. The second adapter 111 is provided with a second water inlet adapter channel 114 communicating the latter section 49 of the water supply and the second water inlet communication groove 112, and a second water return adapter channel 115 communicating the latter section 342 of the water return and the second water return communication groove 113. The upper end of the second adapter 111 penetrates into the brewing seat body 7 for connecting the second water inlet adapter channel 114 with the latter section 49 of the water supply and connecting the second water return adapter channel 115 with the latter section 342 of the water return. One ends of the second water inlet adapter channel 114 and the second water return adapter channel 115 are exposed at the upper end of the second adapter 111 for the latter section 49 of the water supply and the latter section 342 of the water return to be connected. In order to simplify the pipeline more, a transfer block 116 is arranged on the brewing seat body 7. An outlet transfer block channel and an inlet transfer block channel are arranged in the transfer block 116. One end of the transfer block 116 covers the upper end of the second adapter 111 so that the second water inlet adapter channel 114 and the second water return adapter channel 115 are respectively communicated with the outlet transfer block channel and the inlet transfer block channel. The other ends of the outlet transfer block channel and the inlet transfer block channel are connected with the latter section 49 of the water supply and the latter section 342 of the water return. The transfer block 116 is an L-shaped block. The second adapter 111 and the brewing seat body 7, specifically, the upper end of the second adapter 111 is fixed to the transfer block 116 by bolts, and the transfer block 116 is fixed on the brewing seat body 7. When the brewing seat body 7 is pushed, the second adapter 111 is driven to rotate relative to the rotating arm 11, so that the brewing seat body 7 is unfolded relative to the rotating arm 11 once again. The lower end of the second adapter 111 penetrates out of the second transfer cavity 102. A flange and an elastic washer are arranged between the downward penetrating end of the second transfer cavity 102 and the rotating arm 11.

[0067] To facilitate the installation and use of the extraction head 3, a vertically extending support rod 71 is provided on the brewing seat body 7. The extraction head 3 is detachably clamped to the upper end of the support rod 71, so that the extraction head 3 can be detached and used independently. A clamping seat 30 is provided on the extraction head 3, and a connecting rod 72 is provided at the upper end of the support rod 71. The connecting rod 72 is an L-shaped rod. One end of the connecting rod 72 is provided with a first inverted trapezoidal clamping block 73, and the upper end of the support rod 71 is provided with a first inverted trapezoidal clamping groove 74 for the first inverted trapezoidal clamping block 73 to be inserted into. The upper end of the first inverted trapezoidal clamping block 73 is wide and the lower end is narrow. The shape of the first inverted trapezoidal clamping groove 74 matches that of the first inverted trapezoidal clamping block 73, and the first inverted trapezoidal clamping block 73 can be supported in the first inverted trapezoidal clamping groove 74. The upper end of the support rod 71 is also provided with a first locking block groove 75 that can communicate with the first inverted trapezoidal clamping groove 74. One side of the first locking block groove 75 is open. A first locking groove 76 is provided on the first inverted trapezoidal clamping block 73, and the left or right side of the first locking groove 76 is open. A first convex buckle 77 that can be inserted into the first locking groove 76 is inserted into the first locking block groove 75. When the first convex buckle 77 is pulled out of the first locking block groove 75, the protruding end of the first convex buckle 77 is inserted into the first locking groove 76 to lock the first inverted trapezoidal clamping block 73. When the first convex buckle 77 is pushed inward, the protruding end of the first convex buckle 77 slides out of the first locking groove 76 to unlock the first inverted trapezoidal clamping block 73. A second inverted trapezoidal clamping block 301 is provided on the clamping seat 30. The other end of the connecting rod 72 is provided with a second inverted trapezoidal clamping groove 78 for the second inverted trapezoidal clamping block 301 to be inserted into and a second locking block groove 79 that communicates with the second inverted trapezoidal clamping groove 78. A second locking groove 302 is provided on the second inverted trapezoidal clamping block 301, and a second convex buckle 70 that can be inserted into the second locking groove 302 is provided in the second locking block groove 79. The locking and disassembly of the clamping seat 30 are the same as those of the first inverted trapezoidal clamping block 73. For the convenience of use, a receiving groove 700 is provided below the extraction head 3 on the brewing seat body 7. The receiving groove 700 can be used to receive an electronic scale or a cup, etc.

[0068] For convenient control, the valve core 5 is arranged in the valve core cavity 32. The control switch 6 is arranged on the extraction head 3, with one end extending into one side of the valve core 5 to drive the valve core 5, and the other end extending outside the water cavity 31. The upper end of the control switch 6 extends out of the extraction head 3 from the upper end of the water cavity 31. The control switch 6 drives the valve core 5 to axially move along the valve core cavity 32. A sealing ring 50 is arranged on the valve core 5, which can move along with the valve core 5 and control the on-off of the water flow between the valve core cavity 32 and the coffee brewing cavity 33 and the on-off of the water flow between the valve core cavity 32 and the return water channel 34. The sealing ring 50 is sleeved outside the valve core 5. When the valve core 5 axially moves, the sealing ring 50 also moves accordingly. When the sealing ring 50 moves to the position where the water flow between the coffee brewing cavity 33 and the valve core cavity 32 is connected, the water flow between the valve core cavity 32 and the return water channel 34 is disconnected, that is, the sealing ring 50 seals and separates or connects the valve core cavity 32 and the return water channel 34. When the sealing ring 50 moves to the position where the water flow between the valve core cavity 32 and the coffee brewing cavity 33 is disconnected, the water flow between the valve core cavity 32 and the return water channel 34 is connected, that is, the sealing ring 50 seals and separates or connects the valve core cavity 32 and the coffee brewing cavity 33. In this case, two sealing rings 50 are arranged, and the two sealing rings 50 are axially spaced apart from each other and sleeved outside the valve core 5. In this way, the space between the two sealing rings 50 in the valve core cavity 32 is sealed. When the valve core cavity 32 is connected to the coffee brewing cavity 33, the communication hole connecting the return water channel 34 and the valve core cavity 32 is sealed between the two sealing rings 50. In this way, the sealing ring 50 blocks the flow to the return water channel 34, while the communication hole between the coffee brewing cavity 33 and the valve core cavity 32 is not sealed by the sealing ring 50. Similarly, when the communication hole between the coffee brewing cavity 33 and the valve core cavity 32 is located between the two sealing rings, the coffee brewing cavity 33 and the valve core cavity 32 are sealed and disconnected, and the return water channel 34 is connected to the valve core cavity 32. Of course, a sealing ring 50 can also be used to directly block the communication hole. A valve core inner cavity 51 extending along the length direction of the valve core 5 is arranged in the valve core 5, and one end of the valve core inner cavity 51 can connect the water in the water supply cavity 31 of the valve core cavity 32 to enter. The sealing ring 50 divides the valve core cavity 32 into a first cavity 321 that can communicate with the coffee brewing cavity 33 and a second cavity 322 that can communicate with the return water channel 34 along the length direction. The first cavity 321 and the second cavity 322 are respectively on the left and right sides of the two sealing rings 50, and the spaces of the first cavity 321 and the second cavity 322 will change as the sealing ring 50 moves.On the wall of the valve core 5, there are a first communication hole 52 and a second communication hole 53 that are spaced along the length direction of the valve core 5 and communicate the first chamber 321 with the inner cavity 51 of the valve core and the second chamber 322 with the inner cavity 51 of the valve core respectively. The first communication hole 52 and the first communication hole 52 are on both sides of the sealing ring 50 respectively. The first communication hole 52 can drain the water in the water chamber 31 to one side of the sealing ring 50, and the first communication hole 52 can drain the water in the water chamber 31 to the other side of the sealing ring 50. When the sealing ring 50 moves to a position where the water flow between the first chamber 321 and the coffee brewing chamber 33 is connected, the sealing ring 50 disconnects the water flow between the second chamber 322 and the return water channel 34, that is, the sealing ring 50 seals the hole connecting the return water channel 34 and the second chamber 322. When the sealing ring 50 moves to a position where the water flow between the first chamber 321 and the coffee brewing chamber 33 is disconnected, the sealing ring 50 connects the water flow between the second chamber 322 and the return water channel 34, that is, the sealing ring 50 seals the communication hole between the return water channel 34 and the second chamber 322.

[0069] In order to facilitate position control, a positioning pin 13 with one end extending into the valve core chamber 32 is provided in the water chamber 31. On the valve core 5, there are a first positioning edge 55 that is blocked by the positioning pin 13 when the valve core 5 moves to a position where the coffee brewing chamber 33 is connected to the valve core chamber 32 and a second positioning edge 56 that is blocked by the positioning pin 13 when the valve core 5 moves to a position where the return water channel 34 is connected to the valve core chamber 32. The positions of the positioning pin 13 at the first positioning edge 55 and the second positioning edge 56 are respectively two gears of the control switch 6, which is convenient for judging whether the two gears are adjusted in place.

[0070] The valve core 5 is provided with a worm section 54. The control switch 6 includes a rotating head 61 provided outside the extraction head 3. The rotating head 61 is provided with a worm gear 62 that can extend into one side of the valve core 5 and mesh with the worm section 54. A notch is provided on the valve core chamber 32 to expose the worm section 54 from the water chamber 31, so that the worm gear 62 can extend into the water chamber 31 to mesh with the worm section 54. Of course, it can also be in the form of a gear and a rack. The rotating head 61 extends out from the upper end of the water chamber 31. The upper end of the water chamber 31 is open. The upper end of the extraction head 3 is provided with an outer ring cover covering the upper end opening of the water chamber 31, a middle ring cover provided inside the outer ring cover, and an inner ring cover threadedly connected inside the middle ring cover. The upper end of the rotating head 61 passes out from inside the inner ring cover. The upper end of the rotating head 61 is provided with a rotating handle. The outer ring cover, the middle ring cover, the inner ring cover, and the rotating head 61 are all connected in a sealed manner.

[0071] In order to raise the water level in the water chamber 31 and reduce the air in the water chamber 31, the return water channel 34 includes an external return water pipe 43 provided outside the extraction head 3 and a return water joint 35 provided inside the extraction head 3. The external return water pipe 43 is inserted into the return water joint 35. A communication groove 36 is provided inside the extraction head 3 to connect the return water joint 35 and the valve core chamber 32. The top of the communication groove 36 is covered by a lid. Inside the extraction head 3, there are a return water joint 35 capable of connecting the return water pipe 43 and a communication groove 36 connecting the return water joint 35 and the valve core chamber 32. The upper end of the communication groove 36 extends towards the top of the water chamber 31. The top of the communication groove 36 is higher than the return water joint 35 and the valve core chamber 32. Both ends of the communication groove 36 extend downward to communicate with the return water joint 35 and the valve core chamber 32 respectively. In this way, the water flow in the return water joint 35 has a certain height pressure, the water level height in the water chamber 31 will be raised, and the air in the water chamber 31 will be reduced.

[0072] A pressure gauge chamber 37 capable of communicating with the water chamber 31 is provided on the extraction head 3. A pressure gauge is installed inside the pressure gauge chamber 37. A pressure measuring column 371 extending towards the top of the water chamber 31 and close to the top of the water chamber 31 is provided on the pressure gauge chamber 37. A pressure measuring communication hole 372 connecting the pressure gauge chamber 37 and the inside of the water chamber 31 is provided at the top of the pressure measuring column 371. When the water pump 4 pumps water into the water chamber 31, the pressure in the water chamber 31 continuously increases. Due to the pressure in the water chamber 31, the top inside the water chamber 31 will not be filled. The pressure gauge can measure the pressure inside the water chamber 31 according to the pressure at the top of the water chamber 31.

[0073] A pressure relief chamber 38 capable of communicating with the water chamber 31 is provided on the extraction head 3. A pressure relief column 381 extending towards the top of the water chamber 31 and close to the top of the water chamber 31 is provided on the pressure relief chamber 38. A pressure relief communication hole 382 connecting the pressure relief chamber 38 and the inside of the water chamber 31 is provided at the top of the pressure relief column 381. A pressure relief valve 383 capable of sealing the pressure relief chamber 38 is provided inside the pressure relief chamber 38. The pressure relief valve 383 is an ordinary one-way valve, which belongs to a common structure. It is mainly composed of a valve stem and a spring. The valve stem can only move in the direction of overcoming the spring force, so it is called a one-way valve. A pressure relief switch 384 capable of pushing the pressure relief valve 383 to open and allowing the air to flow out of the extraction head 3 is provided on the extraction head 3. The pressure relief switch 384 pushes the valve stem to overcome the spring force. The pressure relief switch 384 is a shrapnel. When the shrapnel is pushed towards the pressure relief valve 383, the shrapnel bends towards the pressure relief valve 383 side to push the valve stem of the pressure relief valve 383.

[0074] In order to enable pressure use without a water pump, an inflation chamber 39 communicating with the water chamber 31 is provided on the extraction head 3. An inflation column 391 extending towards the top of the water chamber 31 and close to the top of the water chamber 31 is provided on the inflation chamber 39. An inflation communication hole 392 communicating the inflation chamber 39 and the inside of the water chamber 31 is provided at the top of the inflation column 391. An inflation check valve 393 capable of controlling the unidirectional flow of air from the inflation chamber 39 into the water chamber 31 is provided in the inflation chamber 39. In this way, an inflation device can be used to inject air pressure into the water chamber 31. The inflation communication hole 392, the pressure relief communication hole 382, and the pressure relief communication hole 382 can be as close as possible to the top of the water chamber. A hollow cylinder with an open upper end is provided in the water chamber 31, and the inflation chamber 39,

[0075] To facilitate water collection, the bottom of the electric kettle 2 and the tabletop 1 are respectively plugged through a coupler. The water outlet pipe 41 passes through the coupler and communicates with the inside of the electric kettle 2. A first water outlet check valve 44 for controlling the unidirectional flow of water from the inside of the electric kettle 2 to the water pump 4 is provided at one end of the water outlet pipe 41 that penetrates into the electric kettle 2. A second water outlet check valve 441 for controlling the unidirectional flow of water from the inside of the electric kettle 2 to the water pump 4 is provided in the middle of the water outlet pipe 41. A pressure relief pipe 461 is provided on the water outlet pipe 41 between the second water outlet check valve 441 and the diaphragm pump 47. A pressure relief water check valve 442 for controlling the discharge of water from the pressure relief pipe 461 to the outside is provided on the pressure relief pipe 461. When the water pump 4 stops working, due to the action of water flow inertia and the like, the water pressure in the water outlet pipe 41 will increase. When the pressure reaches a certain level, it can be relieved through the pressure relief water check valve 442 to prevent water droplets from emerging at the end of the water outlet pipe 41 inside the electric kettle 2 due to excessive pressure inside the water outlet pipe 41. The part of the second water outlet check valve 441 outside the electric kettle 2. A horizontally arranged bubble blocking cover 45 is provided at one end of the water outlet pipe 41 that penetrates into the electric kettle 2. The bubble blocking cover 45 can be in the shape of a horizontal cover. The water outlet pipe 41 is in the middle of the bubble blocking cover 45, and the water inlet end of the water outlet pipe 41 is above the bubble blocking cover 45. In this way, when the water is heated, water bubbles will not appear at the water inlet of the water outlet pipe 41, preventing the situation where there are only water bubbles and the water cannot be pumped out.

[0076] Of course, in this embodiment, water extraction is achieved through a coupler. Of course, two holes can also be directly opened on the electric kettle 2 and plugged with the water outlet pipe 41 and the water return pipe 43 respectively.

[0077] On the tabletop 1, there is a water supply elbow pipe 12 that extends vertically and can supply water to the electric kettle 2. The end of the water supply elbow pipe 12 is above the electric kettle 2. On the water return channel 34, there is an insertion port for one end of the water return pipe 43 to be inserted. The other end of the water return pipe 43 is connected to the water supply elbow pipe 12. The water supply elbow pipe 12 is equivalent to a faucet to add water to the electric kettle 2. A water supply pipe 14 is connected to the water return channel 34. A water pump 15 that can pump water to the water return channel 34 and a water supply one-way valve 16 that can control the one-way flow of water from the water pump 15 to the water return pipe 43 are connected to the water supply pipe 14. A water return one-way valve 343 that controls the one-way flow of water to the side of the electric kettle 2 is provided on the water return channel 34. The one-way flow is not connected in the reverse direction. The water return one-way valve 343 prevents water from flowing to the side of the extraction head 3 through the water return channel 34 when the water pump 15 supplies water. The water pump 15 pumps water from the outside to the water return pipe 43, and then enters the water supply elbow pipe 12 to add water to the electric kettle 2.

[0078] Embodiment 2, as Figures 20 - 22 shown, a desktop coffee machine, the difference from Embodiment 1 lies in that the valve core 5 and the control switch 6 are different. In this embodiment, two valves are used to control respectively. Specifically, it includes a tabletop 1 that can be embedded in the tea table;

[0079] An electric kettle 2, which is provided on the electric kettle 2;

[0080] An extraction head 3, which is provided on the tabletop 1. A water return channel 34 that can return water to the electric kettle 2 is provided on the extraction head 3;

[0081] A water pump 4, which is provided on the tabletop 1. The setting of the water pump 4 is the same as that in Embodiment 1. An outlet pipe 41 that can pump out the water in the electric kettle 2 and a water supply pipe 42 that sends the pumped water to the extraction head 3 are provided on the water pump 4. A water cavity 31 that is connected to the water supply pipe 42 and the water return channel 34, a valve core cavity 32 that can be connected to the water cavity 31, and a coffee brewing cavity 33 that can be connected to the valve core cavity 32 are provided in the extraction head 3. The water cavity 31 is respectively connected to the water return channel 34 and the water supply pipe 42. A communication hole is opened on a section of the water return channel 34 in the water cavity 31 to communicate with the water cavity 31. The composition of the water pump 4 and the connection of the water pipes are the same as those in Embodiment 1.

[0082] A valve core 5, which is provided in the valve core cavity 32 to control the on-off of the water flow between the coffee brewing cavity 33 and the valve core cavity 32. The valve core 5 only controls the water flow channel between the coffee brewing cavity 33 and the valve core cavity 32. The valve core 5 has no second communication hole 53 compared with Embodiment 1. It only controls the on-off of the water flow between the coffee brewing cavity 33 and the valve core cavity 32. The two sealing rings 50 only control the on-off of the coffee brewing cavity 33 and the valve core cavity 32. The first positioning edge 55 and the second positioning edge 56 limit the position of the valve core 5. A communication groove 36 is provided on the water return channel 34 of the water cavity 31. The top of the communication groove 36 is higher than the water return channel 34 to raise the water level;

[0083] A control switch 6 is provided on the extraction head 3 to drive the valve core 5 to control the disconnection or connection of the water flow between the coffee brewing chamber 33 and the valve core chamber 32. The mechanism of the control switch 6 is the same as that of the first embodiment;

[0084] A control valve 8 is provided on the return water channel 34 to control the on-off of the water flow between the return water channel 34 and the water chamber 31. The control valve 8 can be a gate valve or a manual valve, that is, it is controlled by a handle. The valve core in the control valve 8 opens or closes the return water channel 34. When the valve core 5 controls the connection between the coffee brewing chamber 33 and the valve core chamber 32, the control valve 8 needs to be closed so as not to affect coffee brewing; when return water preheating is required, the valve core 5 controls the closure between the coffee brewing chamber 33 and the valve core chamber 32, and at this time, the control valve 8 is operated to open the return water channel 34. That is, the difference between the second embodiment and the first embodiment is that the valve core 5 and the control valve 8 are respectively used to control the on-off of the water flow for brewing coffee and preheating the return water. The mechanism on the swing arm in this embodiment is the same as that of the first embodiment.

[0085] The third embodiment is different from the first embodiment in that a water storage tank 19 is added. Specifically, a water storage tank 19 is provided in the middle of the water outlet pipe 41 between the electric kettle 2 and the water pump 4. The pumping end of the water pump 4 is connected to the bottom of the water storage tank 19, and the water outlet pipe 41 is connected to the top of the water storage tank 19. In this way, the water storage tank 19 can store water. The water storage tank 19 is provided between the gear pump 46 and the second water outlet one-way valve 441, and the pumping end of the gear pump 46 is communicated with the bottom of the water storage tank 19. This can prevent the water in the electric kettle 2 from being continuously pumped out under specific circumstances (for example, because there are a large number of bubbles in the water in the electric kettle 2 during heating, and at this time, the water cannot be stably pumped out and air bubbles may be pumped), and ensure that the water can be continuously pumped during pumping.

Claims

1. A desktop coffee machine, characterized in that: including a table top (1); An electric kettle (2) arranged on the table (1); An extraction head (3) is arranged on the table (1), and the extraction head (3) is provided with a water return channel (34) capable of returning water to the electric kettle (2); A water pump (4) is arranged on the table (1), the water pump (4) is provided with a water outlet pipe (41) capable of pumping water out of the electric kettle (2) and a water supply pipe (42) for delivering the pumped water to the extraction head (3), the extraction head (3) is provided with a water cavity (31) connected to the water supply pipe (42), a valve core cavity (32) capable of communicating with the water cavity (31) and the water return channel (34), and a coffee brewing cavity (33) capable of communicating with the valve core cavity (32); A valve core (5) for controlling the water flow between the coffee brewing chamber (33) and the valve core chamber (32) and between the return water channel (34) and the valve core chamber (32); A control switch (6) drives the valve core (5) to control the disconnection or connection of the water flow between the coffee brewing chamber (33) and the valve core chamber (32) and to control the connection or disconnection of the water flow between the return water channel (34) and the valve core chamber (32).

2. A desktop coffee machine according to claim 1, characterized in that: The table top (1) is provided with a rotating arm (11) with one end relatively rotatably arranged on the upper end of the table top (1), and the bottom of the extraction head (3) is provided with a brewing seat (7), and the brewing seat (7) is rotatably arranged on the other end of the rotating arm (11).

3. A desktop coffee machine according to claim 2, characterized in that: The water supply pipe (42) comprises a water supply front section (48) connected to the water pump (4) and a water supply rear section (49) connected to the extraction head (3); the water return channel (34) comprises a water return front section (341) capable of directing water to the electric kettle (2) and a water return rear section (342) connected to the valve core chamber (32); the rotating arm (11) is provided with a water inlet connecting channel (17) and a water return connecting channel (18); the two ends of the rotating arm (11) are respectively provided with a first transfer chamber (101) and a second transfer chamber (102) connected to the water inlet connecting channel (17) and the water return connecting channel (18); the first transfer chamber (101) and the second transfer chamber (102) are connected to the water inlet connecting channel (17) and the water return connecting channel (18); The cavity (101) is relatively rotatably plugged with a first adapter (103); the first adapter (103) is provided with a first water inlet connecting groove (104) and a first water return connecting groove (105) which can seal and separate the first adapter cavity (101) from top to bottom; the first water inlet connecting groove (104) is connected to a water inlet connecting passage (17); the first water return connecting groove (105) is connected to a water return connecting passage (18); the first adapter (103) is provided with a first water inlet connecting passage (106) which connects the water supply front section (48) and the first water inlet connecting groove (104); and a first water return connecting passage (106) which connects the water return front section (341) and the first water return connecting passage (18); A first water return transfer channel (107) of a water return connecting groove (105); the lower end of the first adapter (103) penetrates into the table top (1) so that the first water inlet transfer channel (106) is connected to the water supply front section (48) and the first water return transfer channel (107) is connected to the water return front section (341); the second adapter (111) is relatively rotatably plugged into the second transfer chamber (102); the second adapter (111) is provided with a second water inlet connecting groove (112) and a second water return connecting groove (113) which can seal and separate the second transfer chamber (102) from top to bottom; the second water inlet connecting groove (112) and the The second water return connecting groove (113) is connected to the water return connecting groove (18); the second adapter (111) is provided with a second water inlet transfer channel (114) connecting the water supply rear section (49) and the second water inlet connecting groove (112), and a second water return transfer channel (115) connecting the water return rear section (342) and the second water return connecting groove (113); the upper end of the second adapter (111) penetrates into the brewing seat body (7) for connecting the second water inlet transfer channel (114) with the water supply rear section (49) and the second water return transfer channel (115) with the water return rear section (342).

4. The desktop coffee machine according to claim 1, characterized in that: A brewing seat (7) is provided on the table top (1), a vertically extending support rod (71) is provided on the brewing seat (7), and the extraction head (3) is detachably clamped on the upper end of the support rod (71).

5. A desktop coffee machine according to claim 4, characterized in that: The extraction head (3) is provided with a card seat (30), the upper end of the support rod (71) is provided with a connecting rod (72), one end of the connecting rod (72) is provided with a first inverted trapezoidal card block (73), the upper end of the support rod (71) is provided with a first inverted trapezoidal card groove (74) for the first inverted trapezoidal card block (73) to be inserted, the upper end of the support rod (71) is also provided with a first locking block groove (75) that can be connected to the first inverted trapezoidal card groove (74), the first inverted trapezoidal card block (73) is provided with a first locking groove (76), and the first locking block groove (75) is provided with a first locking groove (76). A first convex buckle (77) capable of being inserted into the first locking groove (76) is inserted; a second inverted trapezoidal clamping block (301) is provided on the clamping seat (30); a second inverted trapezoidal clamping groove (78) for inserting the second inverted trapezoidal clamping block (301) and a second locking block groove (79) connected to the second inverted trapezoidal clamping groove (78) are provided on the other end of the connecting rod (72); a second locking groove (302) is provided on the second inverted trapezoidal clamping block (301); and a second convex buckle (70) capable of being inserted into the second locking groove (302) is provided in the second locking block groove (79).

6. A desktop coffee machine according to claim 2 or 3, characterized in that: The brewing seat (7) is provided with a receiving groove (700) below the extraction head (3).

7. The desktop coffee machine according to claim 1, characterized in that: The valve core (5) is arranged in the valve core cavity (32), and the control switch (6) is arranged on the extraction head (3) with one end extending into one side of the valve core (5) to drive the valve core (5) and the other end extending out of the water cavity (31).

8. The desktop coffee machine according to claim 7, characterized in that: The control switch (6) drives the valve core (5) to move axially along the valve core chamber (32). The valve core (5) is provided with a sealing ring (50) which can move with the valve core (5) and can control the water flow interruption between the valve core chamber (32) and the coffee brewing chamber (33) and the water flow interruption between the valve core chamber (32) and the return channel (34). When the sealing ring (50) moves to control the water flow between the coffee brewing chamber (33) and the valve core chamber (32), the water flow between the valve core chamber (32) and the return channel (34) is interrupted. When the sealing ring (50) moves to control the water flow between the valve core chamber (32) and the coffee brewing chamber (33), the water flow between the valve core chamber (32) and the return channel (34) is connected.

9. The desktop coffee machine according to claim 8, characterized in that: The valve core (5) is provided with a valve core inner cavity (51) extending along the length direction of the valve core (5) and one end of which can communicate with the valve core cavity (32) to allow water in the water supply cavity (31) to enter. The sealing ring (50) divides the valve core cavity (32) along the length direction into a first cavity (321) that can communicate with the coffee brewing cavity (33) and a second cavity (322) that can communicate with the water return channel (34). The wall of the valve core (5) is provided with a first connecting hole (52) that connects the first cavity (321) and the valve core inner cavity (51) and a second connecting hole (52) that connects the second cavity (322) and the first connecting hole (52) that connects the first cavity (321) and the valve core inner cavity (51) and a second connecting hole (52) that connects the second cavity (322) and the first connecting hole (52) that are arranged at intervals along the length direction of the valve core (5). 2) a second communicating hole (53) with the inner cavity (51) of the valve core, the first communicating hole (52) and the second communicating hole (53) are respectively located on both sides of the sealing ring (50), when the sealing ring (50) moves to the point where the water flow between the first cavity (321) and the coffee brewing cavity (33) is connected, the sealing ring (50) disconnects the water flow between the second cavity (322) and the return water channel (34), and when the sealing ring (50) moves to the point where the water flow between the first cavity (321) and the coffee brewing cavity (33) is disconnected, the sealing ring (50) connects the water flow between the second cavity (322) and the return water channel (34).

10. The desktop coffee machine according to claim 1, characterized in that: The extraction head (3) is provided with a positioning pin (13) having one end extending into the valve core cavity (32); the valve core (5) is provided with a first positioning edge (55) which is blocked by the positioning pin (13) when the valve core (5) moves to the coffee brewing cavity (33) and communicates with the valve core cavity (32); and a second positioning edge (56) which is blocked by the positioning pin (13) when the valve core (5) moves to the water return channel (34) and communicates with the valve core cavity (32).

11. The desktop coffee machine according to claim 1, characterized in that: The valve core (5) is provided with a worm section (54), and the control switch (6) comprises a rotating head (61) arranged outside the extraction head (3), and the rotating head (61) is provided with a worm wheel (62) which can extend into one side of the valve core (5) and mesh with the worm section (54).

12. The desktop coffee machine according to claim 1, characterized in that: The water return channel (34) comprises an external water return pipe (43) arranged outside the extraction head (3) and a water return joint (35) arranged inside the extraction head (3); a connecting groove (36) connecting the water return joint (35) and the valve core chamber (32) is provided inside the extraction head (3); the upper end of the connecting groove (36) extends toward the top of the water chamber (31); the top of the connecting groove (36) is higher than the water return joint (35) and the valve core chamber (32); and the two ends of the connecting groove (36) extend downwards respectively to communicate with the water return joint (35) and the valve core chamber (32).

13. The desktop coffee machine according to claim 1, characterized in that: The extraction head (3) is provided with a pressure gauge chamber (37) capable of communicating with the water chamber (31); the pressure gauge chamber (37) is provided with a pressure measuring column (371) extending toward the top of the water chamber (31) and close to the top of the water chamber (31); the top of the pressure measuring column (371) is provided with a pressure measuring connecting hole (372) connecting the pressure gauge chamber (37) and the water chamber (31).

14. The desktop coffee machine according to claim 1, characterized in that: The extraction head (3) is provided with a pressure relief chamber (38) which can be communicated with the water chamber (31); the pressure relief chamber (38) is provided with a pressure relief column (381) which extends toward the top of the water chamber (31) and is close to the top of the water chamber (31); the top of the pressure relief column (381) is provided with a pressure relief connecting hole (382) which connects the pressure relief chamber (38) and the water chamber (31); the pressure relief chamber (38) is provided with a pressure relief valve (383) which can seal the pressure relief chamber (38); and the extraction head (3) is provided with a pressure relief switch (384) which can push the pressure relief valve (383) to open and allow air to flow out of the extraction head (3).

15. The desktop coffee machine according to claim 1, characterized in that: The extraction head (3) is provided with an air-filled cavity (39) which can communicate with the water cavity (31); the air-filled cavity (39) is provided with an air-filled column (391) which extends toward the top of the water cavity (31) and is close to the top of the water cavity (31); the top of the air-filled column (391) is provided with an air-filled connecting hole (392) which connects the air-filled cavity (39) and the water cavity (31); the air-filled cavity (39) is provided with an air-filled one-way valve (393) which can control the one-way flow of air from the air-filled cavity (39) to the water cavity (31).

16. The desktop coffee machine according to claim 1, characterized in that: The bottom of the electric kettle (2) and the table (1) are respectively plugged into each other through a coupler, and the water outlet pipe (41) passes through the coupler and is connected to the electric kettle (2). One end of the water outlet pipe (41) that penetrates into the electric kettle (2) is provided with a first water outlet one-way valve (44) for controlling the one-way flow of water from the electric kettle (2) to the water pump (4).

17. The desktop coffee machine according to claim 16, characterized in that: The water pump (4) comprises a gear pump (46) and a diaphragm pump (47) connected to one water inlet end of the gear water pump (4); the water outlet pipe (41) is connected to the other end of the diaphragm pump (47); a second water outlet check valve (441) for controlling the unidirectional flow of water from the electric kettle (2) to the water pump (4) is provided in the middle of the water outlet pipe (41); a pressure relief pipe (461) is provided on the water outlet pipe (41) between the second water outlet check valve (441) and the diaphragm pump (47); and a pressure relief water check valve (442) for controlling the water flow to be discharged from the pressure relief pipe (461) is provided on the pressure relief pipe (461).

18. The desktop coffee machine according to claim 16, characterized in that: A bubble blocking cover (45) capable of vertically blocking bubbles is provided on one end of the water outlet pipe (41) that penetrates into the electric kettle (2).

19. The desktop coffee machine according to claim 1, characterized in that: The table top (1) is provided with a water supply elbow (12) extending vertically and capable of supplying water to the electric kettle (2); the end of the water supply elbow (12) is above the electric kettle (2); one end of the return water channel (34) is connected to the water supply elbow (12); the return water channel (34) is connected to a water supply pipe (14); the water supply pipe (14) is connected to a water pump (15) capable of pumping water to the return water channel (34) and a water supply check valve (16) capable of controlling the unidirectional flow of water from the water pump (15) to the return water pipe (43); the return water channel (34) is provided with a return water check valve (343) capable of controlling the unidirectional flow of water to one side of the electric kettle (2).

20. The desktop coffee machine according to claim 16, characterized in that: A water storage tank (19) is provided in the middle of the water outlet pipe (41) between the electric kettle (2) and the water pump (4); the water pumping end of the water pump (4) is connected to the bottom of the water storage tank (19); and the water outlet pipe (41) is connected to the top of the water storage tank (19).

21. A desktop coffee machine, characterized in that: including a table top (1); An electric kettle (2), which is arranged on the electric kettle (2); An extraction head (3) is arranged on the table (1), and the extraction head (3) is provided with a water return channel (34) capable of returning water to the electric kettle (2); A water pump (4) is arranged on the table (1), the water pump (4) is provided with a water outlet pipe (41) capable of pumping water out of the electric kettle (2) and a water supply pipe (42) for delivering the pumped water to the extraction head (3), the extraction head (3) is provided with a water cavity (31) connected with the water supply pipe (42) and the water return channel (34), a valve core cavity (32) capable of communicating with the water cavity (31), and a coffee brewing cavity (33) capable of communicating with the valve core cavity (32); A valve core (5) is arranged in the valve core cavity (32) to control the water flow between the coffee brewing cavity (33) and the valve core cavity (32); A control switch (6) is provided on the extraction head (3) to drive the valve core (5) to control the water flow between the coffee brewing chamber (33) and the valve core chamber (32) to be disconnected or connected; A control valve (8) is provided on the water return channel (34) to control the water flow between the water return channel (34) and the water chamber (31).

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