CN112545309A

CN112545309A - Small coffee machine

Info

Publication number: CN112545309A
Application number: CN202011320050.XA
Authority: CN
Inventors: 伍平安; 林谦忠
Original assignee: Ningbo Yansen Electronic Technology Co ltd
Current assignee: Ningbo Yansen Electronic Technology Co ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-03-26

Abstract

The invention relates to a small coffee machine, which comprises an upper shell, a lower shell, an extraction box, a heating device and a water pump, wherein the heating device and the water pump are arranged in the lower shell; the top end of the upper shell is transversely provided with an extraction mounting part, and the extraction box is detachably connected with the lower end of the extraction mounting part; the upper shell is connected with the lower shell in a rotating mode, so that the upper shell drives the extraction installation part and the extraction box to rotate in the horizontal direction relative to the lower shell, the extraction installation part and the extraction box are staggered with the lower shell when the coffee machine is in a use state so as to be extracted, the extraction installation part and the extraction box return to the original position to be located right above the lower shell together with the upper shell when the coffee machine is not in use, and the whole machine is compact in structure and uniform in heating.

Description

Small coffee machine

Technical Field

The invention relates to the technical field of coffee machines, in particular to a small-sized coffee machine.

Background

Coffee, as a marked drink with modern life taste, gradually enters daily work, study and life of people. People can soak a cup of strong and mellow coffee at leisure time, so that the spirit can be greatly improved, and people can slowly enjoy infinite relaxation and beauty at leisure time.

With the continuous improvement of the drinking frequency of coffee, more and more people need to use coffee machines to make coffee when traveling outdoors or at home. However, the heating device of the coffee machine on the market is unreasonable in design, long in preheating and heating time, uneven in heating and large in occupied space, so that the whole layout of the coffee machine is not compact enough and is inconvenient to carry.

Disclosure of Invention

In view of the above problems, the present invention provides a small coffee machine with fast heating time, uniform heating, reasonable layout and compact structure.

In order to achieve the purpose, the technical scheme of the invention is as follows: a small coffee machine, the small coffee machine includes upper casing, lower casing, extraction box and sets up heating device and the water pump in the lower casing, the water pump links to each other with heating device makes it flow into extraction box with the water pressure that will heat through heating device, its characterized in that:

the heating device is an instant heating type heating device, and the instant heating type heating device comprises a heating element formed by a thick film instant heating type boiler and a control component which is connected with the heating element and controls the heating power of the heating element and the speed of water flowing into the heating element so as to heat the water body uniformly;

an extraction mounting part is transversely arranged at the top end of the upper shell, and the extraction box is detachably connected with the lower end of the extraction mounting part;

the upper shell is connected with the lower shell in a rotating mode, so that the upper shell drives the extraction installation part and the extraction box to rotate in the horizontal direction relative to the lower shell, the extraction installation part and the extraction box are staggered with the lower shell when the coffee machine is in a use state so as to be extracted, and the extraction installation part and the extraction box return to the original position to be located right above the lower shell together with the upper shell when the coffee machine is not in use.

Further, the lower casing includes left half casing and right half casing, the top terminal surface middle part of left side half casing upwards extends and forms connecting portion, the lower pot head of going up the casing is established at the connecting portion periphery and can use connecting portion to make the horizontal direction rotation as the pivot.

Furthermore, a gasket tightly arranged at the top end of the connecting part is arranged at the upper end of the connecting part, and the cross sectional area of the gasket is larger than that of the top end of the connecting part;

the lower end of the upper shell is bent inwards and upwards to form a bent part, and the gasket is matched with the top end of the left half shell to limit the bent part between the upper shell and the lower shell so as to prevent the upper shell and the lower shell from being separated.

Furthermore, the top end face of the left half shell is provided with a groove which is circumferentially distributed around the root of the connecting part, and the upper shell is also provided with a positioning component which is matched with the top end of the left half shell to position the upper shell;

the positioning part comprises a positioning pin penetrating through the bent part, the positioning pin can move up and down in the rotating process of the upper shell to be separated from or matched with the groove for positioning, and the positioning pin is located below the gasket to be limited by the gasket and cannot be separated from the bent part when moving upwards.

Furthermore, the positioning part further comprises a compression spring, one end of the compression spring is sleeved on the periphery of the positioning pin, the other end of the compression spring is in contact with the lower end face of the gasket, and the positioning pin moves up and down under the driving of the compression spring.

Furthermore, the extraction box comprises an extraction box body with a lower through hole at the bottom, and an extraction box cover body, wherein the upper end of the extraction box cover body is connected with the lower end of the extraction installation part, and the lower end of the extraction box cover body is connected with the extraction box body in a covering manner so as to form a sealed extraction space;

the upper end face of the extraction box cover body is provided with an upper through hole for water flowing out of the extraction installation part to flow into the sealed extraction space.

Further, the extraction box still includes the extraction box sealing washer that sets up between extraction box body and the extraction box lid with the sealed effect of reinforcing, set up in extraction box inner chamber top and with the last filter screen subassembly that extraction box sealing washer is connected and set up the bottom filter screen subassembly in extraction box inner chamber bottom.

Furthermore, the lower end surface of the extraction box sealing ring is downward to form a positioning bulge, and the outer surface of the extraction box sealing ring is L-shaped;

the positioning bulge is abutted against the upper end face of the port of the extraction box body, and a first bump which can be embedded with the L-shaped outer surface is formed at the corresponding position of the inner wall of the extraction box cover body, so that the extraction box cover body and the extraction box body form a sealed extraction space.

Furthermore, the extraction box also comprises a lower filter screen component arranged below the inner cavity of the extraction box body;

the lower end surface of the extraction box sealing ring is arranged on the port of the extraction box body, the inner wall of the port of the extraction box body sinks to form a first step, and the lower end surface of the extraction box sealing ring correspondingly protrudes downwards to form a positioning bulge which can be in matched contact with the first step to increase the sealing performance;

the outer surface of the extraction box sealing ring is L-shaped, and a first bump which can be embedded with the L-shaped outer surface is formed at the corresponding position of the inner wall of the extraction box cover body.

Furthermore, the upper filter screen assembly comprises an upper filter screen fixing seat and an upper filter screen fixedly connected with the lower end face of the upper filter screen fixing seat, and a through hole opposite to the upper through hole is formed in the upper filter screen fixing seat;

a first boss is formed on the outer surface of the upper filter screen fixing seat outwards, and a second boss is arranged inwards at a position corresponding to the inner wall of the extraction box sealing ring;

the lower end face of the second boss is arranged on the upper end face of the first boss, and the side face of the first boss is abutted against the inner wall of the extraction box sealing ring so as to realize the positioning assembly of the extraction box sealing ring and the upper filter screen fixing seat.

Furthermore, the lower filter screen assembly comprises a lower filter screen cover which is fixed below the inner cavity of the extraction box body and is provided with a water flow through hole, a lower filter screen which is arranged on the upper surface of the lower filter screen cover and a flow limiting hole sheet which is positioned in the water flow through hole;

the inner wall below of extraction box body forms the third boss inwards, the lower filter screen subassembly still includes that the lower extreme is arranged in the upper surface of third boss and the lower filter screen sealing washer of surface laminating extraction box body inner wall, the internal surface of filter screen sealing washer is located down to the edge of filter screen lid and lower filter screen down.

Further, bottom filter screen subassembly is including setting up the bottom filter screen of through-hole top under and the bottom filter screen lid wherein with bottom filter screen holding, the bottom filter screen comprises a plurality of metal mesh that from top to bottom stack in proper order.

Furthermore, the thick film instant heating type boiler is vertically arranged in the left half shell, the lower end of the thick film instant heating type boiler is connected with the water inlet joint, and the upper end of the thick film instant heating type boiler is connected with the water outlet joint so that water flows from bottom to top and flows out after being heated by the thick film instant heating type boiler;

the control assembly comprises a temperature detection component arranged on the thick film instant heating type boiler and a control component which is connected with the temperature detection component and receives the temperature detected by the temperature detection component so as to control the heating power of the thick film instant heating type boiler and the water flow speed flowing into the thick film instant heating type boiler.

Furthermore, the instant heating type heating device also comprises a water outlet pipe which is welded at the upper end of the boiler wall and is bent upwards to guide water in the boiler to flow out, and a water inlet pipe which is welded at the lower end of the boiler wall and is bent downwards to guide water to flow into the boiler;

one end of the water outlet pipe, which is far away from the boiler wall, is assembled in the water outlet connector through a metal meson, and one end of the water inlet pipe, which is far away from the boiler wall, is also assembled in the water inlet connector through a metal meson;

the water outlet joint is internally provided with a bayonet lock positioned at one side of the metal meson close to the upper end face of the boiler so as to realize fixed connection with the water outlet pipe, and the water inlet joint is internally provided with a bayonet lock positioned at one side of the metal meson close to the lower end face of the boiler so as to realize fixed connection with the water inlet pipe.

Furthermore, the thick film instant heating type boiler is a hollow cylinder, and the wall of the boiler is arranged in a cavity mode so that water flows through the water inlet pipe, enters the boiler, circularly flows in the boiler and flows out of the water outlet pipe;

the outer wall of thick film instant heating type boiler is smooth and the inner wall is the screw thread setting towards one side surface of outer wall, outlet pipe and oral siphon all weld on the inner wall and towards the inside shaping of buckling of cylinder.

Furthermore, the instant heating type heating device also comprises a boiler upper cover capable of covering the boiler wall and a boiler lower cover in assembly connection with the boiler upper cover, wherein the upper end of the thick film instant heating type boiler is fixed on the lower end face of the boiler upper cover, and the lower end of the boiler is fixedly assembled with the upper end face of the boiler lower cover.

Further, a temperature controller for detecting the water temperature in the thick film instant heating boiler and a fuse which is connected with the temperature controller and is fused when the temperature controller senses that the water temperature reaches a set value are fixed on the upper cover of the boiler;

the water outlet joint is a two-way joint, or the water outlet joint is a three-way joint, an NTC assembly is arranged in one of the three-way joints, and the temperature detection part comprises the NTC assembly.

Furthermore, the coffee machine also comprises a water inlet pipeline which is arranged in the upper shell, extends into the extraction mounting part and extends out of the lower end surface of the extraction mounting part, and a water tank which is vertically arranged in the right half shell;

the water pump is connected with the instant heating boiler through the water inlet connector and transversely arranged at the bottom of the lower shell, and the water pump is connected with the water tank so as to press water in the water tank into the thick film instant heating boiler through the water inlet connector;

the water inlet pipeline is connected with the water outlet joint and guides water flowing out of the instant heating type boiler into the extraction box.

Further, the coffee machine also comprises a power supply control system arranged on the control assembly, wherein the power supply control system comprises a control module;

the power supply control system is also provided with a first access port for accessing alternating current and a second access port for accessing a battery;

the power supply control system also comprises a power supply access detection module and a switch module, wherein the power supply access detection module is respectively connected with the first access port and the control module, detects an alternating current access signal and then outputs the alternating current access signal to the control module;

the switch module is connected with the second access port and the control module respectively, the control module controls the switch module to be switched off when the power access detection module detects that the alternating current is accessed so that the alternating current serves as a power supply and the battery does not supply power, and controls the switch module to be switched on when the alternating current is not detected so that the battery serves as a power supply to supply power.

Furthermore, the power control system further comprises an ADC detection module which is respectively connected with the control module and the second access port and used for detecting the electric quantity of the battery and transmitting detection information to the control module, and a charging module which is respectively connected with the control module, the first access port and the second access port and is controlled by the control module to enable the alternating current to charge the battery when the ADC detection module detects that the electric quantity of the battery is insufficient and the alternating current is currently used as a power supply.

Further, the power supply access detection module comprises a photoelectric coupler, wherein a light emitting diode part of the photoelectric coupler is connected with alternating current, and a photosensitive triode part of the photoelectric coupler is connected with the control module;

the ADC detection module comprises a divider resistor formed by connecting a first resistor and a second resistor in series, one end of the divider resistor is connected with the second access port, the other end of the divider resistor is grounded, and a voltage signal acquisition port of the control module is connected between the first resistor and the second resistor;

the charging module comprises a voltage-reducing charging module and a charging switch module, wherein the voltage-reducing charging module is used for reducing the voltage of the direct current output after the alternating current is rectified so as to enable the direct current output to meet the charging voltage requirement of the battery and is electrically connected with the second access port, and the charging switch module is respectively connected with the first access port, the voltage-reducing charging module and the control module and enables the first access port and the voltage-reducing charging module to be communicated after the control module controls the conduction of the control module.

Compared with the prior art, the invention has the advantages that: the upper shell and the lower shell are rotatably connected, so that the extraction box and the lower shell are staggered to facilitate taking coffee when in use, and can be positioned right above the lower shell when not in use, the overall structural layout of the coffee machine is compact and reasonable, and the volume of the coffee machine is greatly reduced; the extraction box body is provided with the extraction box cover body, and the extraction box cover body and the extraction box body form an extraction sealed space together, so that guarantee is provided for extracting coffee with pure taste, and the extraction box is convenient to clean and sanitary; the arrangement of the upper and lower filter screen components is beneficial to filtering and extraction, so that the extraction effect is better; adopt thick film instant heating type boiler heating, shortened preheating time greatly, and through control system control boiler heating process, according to the power that generates heat of the feedback adjustment control water velocity and the boiler that the temperature detection part flowed into in the boiler, fine solution the temperature uncontrollable, the inhomogeneous problem of heating, but power switchable and chargeable function has improved the wholeness ability of coffee machine greatly.

Drawings

Fig. 1 is a schematic view of the overall structure of the small coffee machine of the present application.

Fig. 2 is a schematic view of the partially exploded structure of fig. 1.

Fig. 3 is a further exploded view of fig. 2.

Fig. 4 is a cross-sectional view of the extraction cartridge of fig. 1 in an unused state with the outer casing removed.

Fig. 5 is a sectional view of the extraction cartridge of fig. 1 in a use state with the outer case removed.

Fig. 6 is a schematic view of the overall structure of the extraction cartridge.

Fig. 7 is an exploded view of the preferred embodiment of the extraction cartridge of fig. 6.

Fig. 8 is an exploded view of a second preferred embodiment of the extraction cartridge of fig. 6.

Fig. 9 is a cross-sectional view of the preferred embodiment of the extraction cartridge of fig. 6.

Fig. 10 is a cross-sectional view of the second preferred embodiment of the extraction cartridge of fig. 6.

Fig. 11 is an exploded view of the connection between the extraction cartridge and the main body of the coffee maker.

Fig. 12 is an enlarged view of a portion a of fig. 10.

Fig. 13 is an enlarged view of a portion B in fig. 11.

Fig. 14 is a schematic structural view of the tankless heating apparatus without the control assembly.

Fig. 15 is a cross-sectional view of fig. 14.

Fig. 16 is a schematic diagram of the exploded structure of fig. 14.

FIG. 17 is a block diagram of a power control system of the coffee maker of the present application.

FIG. 18 is a schematic circuit diagram of the power access detection module and the AC power connection in the coffee maker power control system of the present application.

FIG. 19 is a schematic circuit diagram of the connection between the battery and the charging module and the ADC detection module in the power control system of the coffee maker according to the present invention.

FIG. 20 is a schematic circuit diagram illustrating the connection between the switch module and the boost module in the power control system of the coffee maker of the present application.

Fig. 21 is a schematic diagram of a control module structure.

Fig. 22 is a schematic diagram of the overall control module of the tankless heating controller.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Fig. 1-16 show schematic structural diagrams of coffee machines corresponding to the present application. As shown in fig. 1 to 5, the small coffee maker comprises an upper shell 1, a lower shell 2 and an extraction cartridge 3, wherein an extraction mounting part 11 is transversely arranged at the top end of the upper shell 1, and the extraction cartridge 3 is detachably connected with the lower end of the extraction mounting part 11. The upper casing 1 and the lower casing 2 are rotatably connected so that the upper casing 1 can drive the extraction mounting part 11 and the extraction cartridge 3 to rotate together in the horizontal direction with respect to the lower casing 2, so that the extraction mounting part 11 and the extraction cartridge 3 are misaligned with the lower casing 2 for extraction when the coffee maker is in use, and the extraction mounting part 11 and the extraction cartridge 3 are returned to their original positions to be positioned directly above the lower casing 2 together with the upper casing 1 when the coffee maker is not in use. It should be mentioned that the extraction mounting 11 is in this embodiment formed by a top end of the upper housing 1 extending laterally, i.e. being formed integrally with the top end of the upper housing 1.

So design, when not using the coffee machine, can be through making the casing and extract the installation department and lie in under the casing jointly directly over to reduce the complete machine volume, be convenient for accomodate and carry, and when coffee machine user state was down, then can be again through rotatory casing, thereby drive the extraction installation department and make the horizontal direction rotation around the casing down jointly, make extraction installation department and lower casing dislocation, so that expose the extraction installation department, the extraction of being convenient for, convenient operation.

The lower shell 2 comprises a left shell half 21 and a right shell half 22, the middle part of the top end surface of the left shell half 21 extends upwards to form a connecting part 211, and the lower end of the upper shell 1 is sleeved on the periphery of the connecting part 211 and can rotate in the horizontal direction by taking the connecting part 211 as a rotating shaft. Meanwhile, the upper end of the connection portion 211 is provided with a gasket 23, the lower end of the upper case 1 is bent inward and upward to form a bent portion 12, and the gasket 23 is engaged with the top end of the left half case 21 to define the bent portion 12 therebetween to prevent the upper case 1 from being separated from the lower case 2. In order to provide a good rotation effect, the connection portion 211 is designed to have a cylindrical structure.

In the present application, the connection portion 211 is connected to the gasket 23 by a screw, of course, other connection methods may be adopted between the connection portion and the gasket, for example, the connection portion 211 is disposed in a hollow structure, an annular groove is formed on a lower end surface of the gasket 23, and an upper end of the connection portion 211 is embedded in the annular groove to realize a tight connection between the connection portion 211 and the gasket, regardless of the connection method, in order to provide a good blocking force, a cross-sectional area of the gasket 23 is larger than a cross-sectional area of an upper end of the connection portion 211, so that the bending portion 12 is limited between the gasket 23 and a top end surface of the left half shell 21, so that, during the rotation of the upper shell 1, due to the effects of the gasket 23 and the top end of the left half shell 21, the bending portion 12 can only move longitudinally within a longitudinal range formed by the length of the connection portion 211, the assembly firmness of the coffee machine is improved.

As shown in fig. 3, the top end surface of the left half casing 21 has a groove 212 circumferentially distributed around the root of the connecting portion 211, and the positioning member 4 includes a positioning pin 41 passing through the bent portion 12, the positioning pin 41 can move up and down to be separated from or positioned in cooperation with the groove 212 during the rotation of the upper casing 1, and the positioning pin 41 is located below the washer 23 to be restricted by the washer 23 during the upward movement, so that the positioning pin does not fall off from the bent portion.

With continued reference to fig. 3, the positioning component 4 further includes a compression spring 42 having one end sleeved on the periphery of the positioning pin 41 and the other end contacting with the lower end surface of the washer 23, and the positioning pin 41 can move up and down under the driving of the compression spring 42.

That is, when rotating upper housing 1, based on compression spring 42's elasticity, compression spring 42 can upwards continue to retract, drive locating pin 42 upward movement, make locating pin 42 break away from in recess 212, thereby it continues the rotation to be convenient for upper housing drive extraction installation department 11 and extraction box 3, the position of adjustment extraction installation department 11 and extraction box 3, after rotatory adjustment is to the position, compression spring 42 again under self restoring force effect, make locating pin 41 downstream, fall into in new recess 212, thereby fix a position once more.

In the present application, the depth of the groove 212 is shallow, so that the rotation operation is flexible, but the groove 212 may be designed to have a deeper depth, which may make the rotation operation slightly laborious, but no matter which design, the design is designed to facilitate the rotation and achieve the good positioning effect, and will not be described in detail herein.

The left and

right half cases

21 and 22 are connected to each other and have a cylindrical structure with the same diameter to enhance the appearance, the upper case 1 is a cylinder with the same diameter as the left half case 21, and the extraction attachment portion 11 is a cylinder with a height smaller than that of the upper case 1 to attach the extraction cartridge 3.

Fig. 6-13 show a schematic view of the construction of an extraction cartridge for a small coffee machine. As shown in fig. 6, 7 and 9, the extraction cartridge 3 includes an extraction cartridge case 31 having a bottom through hole 311, and further includes an extraction cartridge cover 32 having an upper end connected to the extraction mounting portion 11 and a lower end connected to the extraction cartridge case 31 in a covering manner to form a sealed extraction space, wherein an upper through hole 321 is formed in the upper end surface of the extraction cartridge cover 32 for allowing water flowing out from the extraction mounting portion 11 to flow into the sealed extraction space. The extracting box body is only provided with the extracting box cover body which is sealed with the extracting box body in a covering way in the prior art, and an effective sealing space can be formed, thereby providing guarantee for extracting purer coffee. Wherein the size of the small coffee machine is about 162 x 80 x 215mm, and if the volume is small, the volume of the extraction box is also small.

The extraction box also comprises an extraction box sealing ring 33 arranged between the extraction box body 31 and the extraction box cover body 32 to enhance the sealing effect, an upper filter screen assembly 34 arranged above the inner cavity of the extraction box body 31 and connected with the extraction box sealing ring 33, and a bottom filter screen assembly 35 arranged at the bottom of the inner cavity of the extraction box body 31.

In order to reduce the whole volume of the extraction box, the inner wall of the extraction box cover body 3 is connected with the outer wall of the extraction box body 2 through double threads. In order to achieve a good sealing effect, the lower end surface of the sealing ring 33 of the extraction box forms a positioning protrusion 331 downward and the outer surface is "L" shaped, the positioning protrusion 331 abuts against the upper end surface of the port of the extraction box body 31, and meanwhile, a first protrusion 322 capable of being embedded with the "L" shaped outer surface is formed at a corresponding position of the inner wall of the extraction box cover 32, so that the extraction box cover 32 and the extraction box body 31 form a sealed extraction space, the cup body 7 can be placed in the sealed extraction space, for convenience of assembly and disassembly, the filter cup 7 can adopt a design in which the edge of the cup mouth is folded outward to form a folded part 71, the folded part 71 is placed on the edge of the port of the extraction box body 31 to assemble the filter cup 7 in the extraction box body 31, and the positioning protrusion 331 is pressed on the folded part 71, as shown in fig. 8.

This bottom filter screen subassembly 35 is including setting up bottom filter screen 351 in through-hole 311 top down and the bottom filter screen lid 352 with bottom filter screen 351 holding wherein, this bottom filter screen 352 comprises a plurality of metal mesh that stack from top to bottom in proper order, so, can let coffee and air intensive mixing to make the foam more fine and smooth many runs, make the extraction effect more pure.

The upper filter screen assembly 34 in the extraction box 3 includes an upper filter screen fixing seat 341 and an upper filter screen 342 fixedly connected to a lower end surface of the upper filter screen fixing seat 341, and the upper filter screen fixing seat 341 is provided with a through hole 343 opposite to the upper through hole 321. Meanwhile, the outer surface of the upper filter screen fixing seat 341 is outwardly formed with a first boss 344, the inner wall of the extraction box sealing ring 33 is inwardly provided with a second boss 334, the lower end surface of the second boss 334 is arranged on the upper end surface of the first boss 344, and the side surface of the first boss 344 abuts against the inner wall of the extraction box sealing ring 33 to realize the positioning and assembling of the extraction box sealing ring 33 and the upper filter screen fixing seat 34.

In order to better ensure the extraction effect, the extraction cartridge 3 may further include a lower screen assembly 36 disposed below the inner cavity of the extraction cartridge body 31, as shown in fig. 8, 10 and 12, in this case, the lower end surface of the extraction cartridge sealing ring 33 is disposed on the port of the extraction cartridge body 31, the inner wall of the port of the extraction cartridge body 31 sinks to form a first step 312, and the lower end surface of the extraction cartridge sealing ring 33 protrudes downward to form a positioning protrusion 331 capable of being in contact with the first step 312 to increase the sealing performance.

This lower filter screen subassembly 36 is including fixing in extraction box body 31 inner chamber below and having lower filter screen lid 361 of rivers through-hole 3611, set up lower filter screen 362 and the restriction hole piece 363 that is located rivers through-hole 3611 at lower filter screen lid 361 upper surface, extraction box body 31's inner wall below inwards forms third boss 313, lower filter screen subassembly 36 still includes that the lower extreme is placed in the upper surface of third boss 313 and the lower filter screen sealing washer 364 of the outer surface laminating extraction box body 31 inner wall, lower filter screen lid 361 and the edge of lower filter screen 362 inlay the internal surface of locating lower filter screen sealing washer 364. Since the rest of the structure is similar to that shown in fig. 6 and 8, it is not described here.

Fig. 11 and 13 show the connection and matching relationship between the extraction cartridge and the extraction mounting portion, as can be seen from the figures, the upper end of the extraction cartridge cover 32 is formed with a clamping portion 323 inward and upward, the upper end of the periphery of the clamping portion 323 is provided with at least two clamping protrusions 324 distributed at intervals, the extraction mounting portion 11 is correspondingly provided with a sleeve 111 formed downward and capable of being sleeved on the periphery of the clamping portion 323 to be connected with the clamping protrusions 324 in a clamping manner.

Specifically, the inner wall of the sleeve 111 is provided with a recessed portion 112 capable of guiding the engaging protrusion 324 to be inserted into the recessed portion from bottom to top, the upper half portion of the recessed portion 112 extends along the circumferential direction of the inner wall of the sleeve 111 to form a guiding groove 113 capable of guiding the engaging protrusion 324 to move so as to fixedly connect the engaging portion 323 with the sleeve 111, and the lower groove wall of the guiding groove 113 is further provided with a positioning groove 114, and the lower end of the engaging protrusion 324 is correspondingly provided with a positioning protrusion 325 which is matched with the positioning groove 114 to fix the engaging portion 323 and the sleeve 111, as shown in fig. 11.

The coffee machine also comprises instantaneous heating means, as shown in particular in figures 14-16, 22. The instant heating type heating device comprises a control assembly and a heating body which is connected with the control assembly and is vertically arranged in a left half shell 21, the heating body is a thick film instant heating type boiler 5, the lower end of the thick film instant heating type boiler 5 is connected with a water inlet connector 51, the upper end of the thick film instant heating type boiler is connected with a water outlet connector 52, the heating body flows out after being heated by the thick film instant heating type boiler 5 from bottom to top through water supply flow, the control assembly comprises a temperature detection component arranged on the thick film instant heating type boiler 5, the control component 10 is connected with the temperature detection component and receives the temperature detected by the temperature detection component so as to control the heating power of the thick film instant heating type boiler 5 and the water flow speed flowing into the instant heating type thick film.

The instant heating type heating device further comprises a water outlet pipe 53 welded at the upper end of the boiler wall and bent upwards to guide water in the boiler to flow out, and a water inlet pipe 54 welded at the lower end of the boiler wall and bent downwards to guide water to flow into the boiler, wherein one end of the water outlet pipe 53, far away from the boiler wall, is assembled in the water outlet joint 52 through a metal meson 55, one end of the water inlet pipe 54, far away from the boiler wall, is also assembled in the water inlet joint 51 through the metal meson 55, a bayonet 56 positioned at one side of the metal meson 55, close to the upper end face of the boiler, is arranged in the water outlet joint 52 to be fixedly connected with the water outlet pipe 53, and meanwhile, a bayonet 56 positioned at one side of the metal meson 55, close to the lower end face of the.

Thick film instantaneous heating type boiler 5 is hollow cylinder and the boiler wall is the cavity setting and flows in its inner loop after entering with water flow through oral siphon 54 and flows out by outlet pipe 53, and simultaneously, the outer wall 551 of thick film instantaneous heating type boiler 5 is smooth and inner wall 552 is the screw thread setting towards one side surface of outer wall 551, and outlet pipe 53 and oral siphon 54 all weld on inner wall 552 and towards the shaping of buckling inside the cylinder.

The instant heating device further comprises a boiler upper cover 57 capable of covering the boiler wall, and a boiler lower cover 58 assembled with the boiler upper cover 57, wherein the upper end of the thick film instant heating boiler 5 is fixed on the lower end face of the boiler upper cover 57, the lower end of the boiler is fixedly assembled with the upper end face of the boiler lower cover 58, meanwhile, a temperature controller 59 for detecting the water temperature in the thick film instant heating boiler 5 and a fuse 50 connected with the temperature controller 59 and fused when the temperature controller 59 senses that the water temperature reaches a set value are fixed on the boiler upper cover 57, the water outlet joint 52 is a two-way joint or a three-way joint, thus, an NTC component can be arranged in one of the three-way joints, and the temperature detecting component comprises the NTC component 553.

As shown in fig. 3, the coffee maker further comprises a water inlet pipe 6 arranged in the upper housing 1, extending into the extraction mounting part 11 and extending out to the lower end face of the extraction mounting part 11, a water tank 8 vertically arranged in the right housing half 22, and a water pump 9 transversely arranged at the bottom of the lower housing 2, wherein the water pump 9 is connected with the water tank 8 and a water inlet connector 51 respectively, the water inlet pipe 6 is connected with a water outlet connector 52 and guides the water flowing out from the instant heating type boiler 5 into the extraction box 3, obviously, the water in the instant heating type boiler 5 is from the water pump 9, that is, the water pump 9 presses the water in the water tank 8 into the instant heating type boiler 5 from the water inlet connector 51 through a water inlet pipe 54, and simultaneously, the water pressure heated by the thick film boiler 5 is enabled to flow into the instant heating type extraction box 3 through the water inlet pipe 6, and the speed of the water flowing into the instant heating type boiler 5, thereby adjusting the water flow velocity.

The NTC component 553 feeds back the detected water outlet temperature to the control component 10, the control component 10 determines that the water temperature is higher than the set value T, then the heating power of the instantaneous boiler is reduced, and simultaneously, the water velocity flowing into the instantaneous boiler 5 is increased, that is, the pumping power of the water pump 9 is increased, thereby increasing the flow rate, and when the water temperature is found to be lower than the set value T, then the heating power of the instantaneous boiler 5 is increased, and simultaneously, the water velocity flowing into the boiler is reduced, that is, the pumping power of the water pump 9 is also reduced, thereby reducing the flow rate, so, the boiler water temperature is uniformly realized through a temperature feedback mode, and the output is stable. The specific number of the set value T is set according to actual needs, and is not described in detail here.

The upper shell and the lower shell are rotatably connected, so that the extraction box and the lower shell are staggered to conveniently take coffee when in use, and can be positioned right above the lower shell when not in use, the overall structural layout of the coffee machine is compact and reasonable, and the volume of the coffee machine is greatly reduced; the extraction box body is provided with the extraction box cover body, and the extraction box cover body and the extraction box body form an extraction sealed space together, so that guarantee is provided for extracting coffee with pure taste, and the extraction box is convenient to clean and sanitary; the arrangement of the upper and lower filter screen components is beneficial to filtering and extraction, so that the extraction effect is better; adopt thick film instant heating type boiler heating, shortened preheating time greatly, and through control system control boiler heating process, according to the feedback adjustment control of temperature detection part in the velocity of water flow in the boiler and the heating power of boiler, fine solution the temperature uncontrollable, the inhomogeneous problem of heating has improved the wholeness ability of coffee machine.

Meanwhile, it needs to be mentioned that the small coffee machine can heat and pump water by switching on the mains supply, and can also be used as a power supply to supply power and pump water by a lithium battery or a dry battery under the condition of power failure or outdoor electroless convenience, and can be directly converted into the power supply by the mains supply after the power supply is on, and meanwhile, the small coffee machine can also charge the battery in the power supply state, and the specific corresponding power control circuit is as follows:

a preferred embodiment of the present invention which allows dual use of a small coffee maker is shown in fig. 17-21, which, as shown, the coffee machine power control system comprises a control module 1 ', a first access port 2 ' for accessing alternating current, a second access port 3 ' for accessing a battery, a power access detection module 4 ' and a switch module 5 ', the power access detection module 4 ' is respectively connected with the first access port 2 ' and the control module 1 ' and detects an alternating current access signal and then outputs the alternating current access signal to the control module 1 ', ' the switch module 5 ' is respectively connected with the second access port 2 ' and the control module 1 ', the control module 1 ' controls the switch module 5 ' to be switched off when the power access detection module 4 ' detects the alternating current access so that the alternating current is used as a power supply and the battery does not supply power, and when the alternating current is not detected, the switch module 5' is controlled to be started so that the battery can be used as a power supply to supply power.

In order to know the power of the battery, the power control system further comprises an ADC detection module 6 'connected to the control module 1' and the second access port 3 'respectively for detecting the power of the battery and transmitting the detection information to the control module 1'.

In order to ensure that the battery can be presented in a full capacity state when the battery does not have alternating current and needs to be used as a power supply source, the power supply control system further comprises a charging module 7 'which is respectively connected with the control module 1', the first access port 2 'and the second access port 3' and is controlled by the control module 1 'to charge the battery by alternating current when the ADC detection module 6' detects that the battery is insufficient and the alternating current is currently used as the power supply source.

Specifically, as shown in fig. 18-21, the power-on detection module 4 'includes a photo-coupler U2, the light emitting diode portion of the photo-coupler U2 is connected to ac power and the photo-sensitive triode portion is connected to the control module 1'.

Meanwhile, the power control system further comprises a boost module 8 'for boosting the battery voltage and outputting the boosted battery voltage, the switch module 5 comprises a first switch component 51' and a second switch component 52 'which can be synchronously switched on or switched off, the first switch component 51' is connected between the control module 1 'and the second switch component 52' and is controlled by the control module 1 'to be switched on or off, and the second switch component 52' is further connected with the second access port 3 'and the boost module 8' respectively to control the on-off between the second access port 3 'and the boost module 8'. Because the direct current is boosted, the method belongs to the conventional technical design of a person skilled in the art, and therefore, the boosting module 8 is not expanded here any more, and a proper circuit design is selected according to actual needs.

As shown in fig. 18-21, the first switch element 51 ' is a transistor Q10' controlled to be turned ON by the control module 1 ' when the battery is used as power supply, i.e., Q10' is connected to pin 12V _ ON of the control module 1 '; the second switch component 52 ' is a MOS transistor Q5 that is turned on synchronously with the first switch component 51 ' to connect the second access port 3 ' to the boost module 8 ', in this embodiment, the transistor Q10' is an NPN-type transistor, and the MOS transistor Q5 is a P-channel enhancement-type MOS transistor, but the first switch component 51 ' and the second switch component 52 ' may also be other devices having a switch function, as long as the two components can connect the second access port 3 ' to the boost module 8 ' when powered by a battery through cooperation.

With continued reference to fig. 19, the ADC test module 6 ' includes a voltage dividing resistor formed by a first resistor R17 and a second resistor R13 connected in series, wherein one end of the voltage dividing resistor is connected to the second access port 3 ' and the other end is grounded, and the voltage signal acquisition port BAT _ AD of the control module 1 ' is connected between the first resistor R17 and the second resistor R13.

The charging module 7 'comprises a step-down charging module 71' for stepping down the direct current output after rectifying the alternating current so as to enable the direct current output to meet the requirement of the charging voltage of the battery and be electrically connected with the second access port 3 ', and a charging switch module 72' which is respectively connected with the first access port 2 'and the step-down charging module 71' and the control module 1 'and enables the first access port 2' and the step-down charging module 71 'to be communicated after the control module 1' controls the conduction of the control module.

The charging switch module 72 'includes an NPN transistor Q4 and a P-channel enhancement type MOS transistor Q2, wherein a base of the NPN transistor Q4 is connected to the BAT _ ON pin of the control module 1', an emitter is grounded, a collector is connected to a gate of the P-channel enhancement type MOS transistor Q2, a source of the P-channel enhancement type MOS transistor Q2 is connected to the rectified ac to be connected to the first access port 2 ', and a drain is connected to the step-down charging module 71'.

It should also be mentioned that the charging circuit for charging the dc power supply after the commercial power is output through the rectifier bridge is of a conventional design, and therefore, the step-down charging module is not developed in detail here, and is specifically designed according to actual needs; meanwhile, the control module 1' can be a conventional singlechip or other microprocessors.

The specific working principle of the power supply control system is as follows:

the coffee machine is in a standby state after being started, if alternating current is connected, the U2 is connected, the control module obtains a signal to enable the Q10 to be disconnected, the Q5 is disconnected, the battery is not powered and is directly powered by the alternating current, in the process of alternating current power supply, the control module can obtain the voltage value of the divider resistor and judge whether the voltage value is smaller than a preset value, if yes, the Q4 is connected, the Q2 is connected, the alternating current is only rectified and then charges the battery through the voltage reduction charging module, otherwise, the S4 is disconnected, and the Q2 is also disconnected and is not charged; if no alternating current is detected to be connected, the U2 is not conducted, the control module controls the Q10 to be conducted, and further the Q5 is also conducted, so that the battery is connected with the boosting module, and the battery supplies power to the back-end circuit after being boosted by the boosting module.

While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A small coffee machine comprising an upper casing (1), a lower casing (2), an extraction cartridge (3) and a heating device and a water pump (9) arranged in the lower casing (2), the water pump (9) being connected to the heating device and making the water pressure heated by the heating device flow into the extraction cartridge (3), characterized in that:

the heating device is an instant heating type heating device, and the instant heating type heating device comprises a heating body formed by a thick film instant heating type boiler (5) and a control component which is connected with the heating body and controls the heating power of the heating body and the speed of water flowing into the heating body so as to heat a water body uniformly;

an extraction installation part (11) is transversely arranged at the top end of the upper shell (1), and the extraction box (3) is detachably connected with the lower end of the extraction installation part (11);

go up casing (1) and casing (2) rotation phase even down to go up casing (1) and drive extraction installation department (11) and extraction box (3) and make the horizontal direction rotation relatively casing (2) jointly, so that extraction installation department (11) and extraction box (3) misplace with casing (2) down so that extract when coffee machine is in the user state, and make extraction installation department (11) and extraction box (3) return the normal position and be located casing (2) directly over with last casing (1) jointly when not using.

2. A small coffee machine according to claim 1, characterized in that:

lower casing (2) are including left half casing (21) and right half casing (22), the top terminal surface middle part of left side half casing (21) upwards extends and forms connecting portion (211), the lower pot head of going up casing (1) is established at connecting portion (211) periphery and can use connecting portion (211) to make the horizontal direction rotation as the pivot.

3. A small coffee machine according to claim 2, characterized in that:

the upper end of the connecting part (211) is provided with a gasket (23) which is tightly arranged at the top end of the connecting part (211), and the cross sectional area of the gasket (23) is larger than that of the top end of the connecting part (211);

the lower end of the upper shell (1) is bent inwards and upwards to form a bent part (12), and the gasket (23) is matched with the top end of the left half shell (21) to limit the bent part (12) between the upper shell and the lower shell to prevent the upper shell (1) and the lower shell (2) from being separated.

4. A small coffee machine according to claim 3, characterized in that:

the top end face of the left half shell (21) is provided with grooves (212) which are circumferentially distributed around the root of the connecting part (211), and the upper shell (1) is also provided with a positioning component (4) which is matched with the top end of the left half shell (21) to position the upper shell (21);

the positioning component (4) comprises a positioning pin (41) penetrating through the bending part (12) and a compression spring (42) with one end sleeved on the periphery of the positioning pin (41) and the other end contacted with the lower end face of the gasket (23);

the positioning pin (41) can move up and down in the rotating process of the upper shell (1) to be separated from or matched with the groove (212) for positioning, the positioning pin (41) is located below the gasket (23) and limited by the gasket (24) when moving upwards so as not to be separated from the bent part (12), and the positioning pin (41) moves up and down under the driving of the compression spring (42).

5. A small coffee machine according to claim 1, characterized in that:

the extraction box (3) comprises an extraction box body (31) with a lower through hole (311) at the bottom, and an extraction box cover body (32) with the upper end connected with the lower end of the extraction installation part (11) and the lower end connected with the extraction box body (31) in a covering manner to form a sealed extraction space;

an upper through hole (321) for water flowing out from the extraction mounting part (11) to flow into the sealed extraction space is arranged on the upper end surface of the extraction box cover body (32).

6. A small coffee machine according to claim 5, characterized in that:

the extraction box also comprises an extraction box sealing ring (33) which is arranged between the extraction box body (31) and the extraction box cover body (32) to enhance the sealing effect, an upper filter screen component (34) which is arranged above the inner cavity of the extraction box body (31) and connected with the extraction box sealing ring (33), and a bottom filter screen component (35) which is arranged at the bottom of the inner cavity of the extraction box body (31);

bottom filter screen subassembly (35) are including setting up bottom filter screen (351) above through-hole (311) down and bottom filter screen lid (352) wherein with bottom filter screen (351) holding, bottom filter screen (351) comprise a plurality of metal mesh that from top to bottom stack in proper order.

7. A small coffee machine according to claim 6, characterized in that:

the lower end surface of the extraction box sealing ring (33) faces downwards to form a positioning bulge (331) and the outer surface is L-shaped;

the positioning bulge (331) is abutted on the upper end face of the port of the extraction box body (31) and a first convex block (322) capable of being embedded with the L-shaped outer surface is formed at the corresponding position of the inner wall of the extraction box cover body (32), so that a sealed extraction space is formed by the extraction box cover body (32) and the extraction box body (31).

8. A small coffee machine according to claim 6, characterized in that:

the extraction box also comprises a lower filter screen component (36) arranged below the inner cavity of the box body (31) of the extraction box;

the lower end face of the extraction box sealing ring (33) is arranged on a port of the extraction box body (31), the inner wall of the port of the extraction box body (31) sinks to form a first step (312), and the lower end face of the extraction box sealing ring (33) correspondingly protrudes downwards to form a positioning protrusion (331) which can be in matched contact with the first step (312) to increase the sealing performance;

the outer surface of the extraction box sealing ring (33) is L-shaped, and a first convex block (322) which can be embedded with the L-shaped outer surface is formed at the corresponding position of the inner wall of the extraction box cover body (32).

9. A small coffee machine according to claim 7 or 8, characterized in that:

the upper filter screen assembly (34) comprises an upper filter screen fixing seat (341) and an upper filter screen (342) fixedly connected with the lower end face of the upper filter screen fixing seat (341), and a through hole (343) opposite to the upper through hole (321) is formed in the upper filter screen fixing seat (341);

a first boss (344) is formed outwards on the outer surface of the upper filter screen fixing seat (341), and a second boss (334) is arranged inwards at a position corresponding to the inner wall of the extraction box sealing ring (33);

the lower end face of the second boss (334) is arranged on the upper end face of the first boss (344), and the side face of the first boss (344) abuts against the inner wall of the extraction box sealing ring (33) so as to realize the positioning and assembling of the extraction box sealing ring (33) and the upper filter screen fixing seat (342).

10. A small coffee machine according to claim 8, characterized in that:

the lower filter screen assembly (36) comprises a lower filter screen cover (361) which is fixed below the inner cavity of the extraction box body (31) and is provided with a water flow through hole (3611), a lower filter screen (362) which is arranged on the upper surface of the lower filter screen cover (361) and a flow limiting hole sheet (363) which is positioned in the water flow through hole (3611);

inner wall below of extraction box body (31) inwards forms third boss (314), lower filter screen subassembly (36) still include the lower extreme and place the upper surface of third boss (314) in and the lower filter screen sealing washer (364) of outer surface laminating extraction box body (31) inner wall in, the internal surface of filter screen sealing washer (364) is located down to the edge of filter screen lid (361) and lower filter screen (362) inlays down.

11. A small coffee machine according to claim 1, characterized in that:

the thick film instant heating type boiler (5) is vertically arranged in the left half shell (21), the lower end of the thick film instant heating type boiler is connected with the water inlet connector (51), the upper end of the thick film instant heating type boiler is connected with the water outlet connector (52), and water flows out after being heated by the thick film instant heating type boiler (5) from bottom to top;

the control assembly comprises a temperature detection component arranged on the thick film instant heating type boiler (5), and a control component (10) which is connected with the temperature detection component and receives the temperature detected by the temperature detection component so as to control the heating power of the thick film instant heating type boiler (5) and the water flow speed flowing into the thick film instant heating type boiler (5).

12. A small coffee machine according to claim 11, characterized in that:

the instant heating type heating device also comprises a water outlet pipe (53) which is welded at the upper end of the boiler wall and is bent upwards to guide water in the boiler to flow out, and a water inlet pipe (54) which is welded at the lower end of the boiler wall and is bent downwards to guide water to flow into the boiler;

one end of the water outlet pipe (53) far away from the boiler wall is assembled in the water outlet connector (52) through a metal medium (55), and one end of the water inlet pipe (54) far away from the boiler wall is also assembled in the water inlet connector (51) through the metal medium (55);

a bayonet (56) which is positioned at one side of the metal meson (55) close to the upper end face of the boiler is arranged in the water outlet joint (52) to realize the fixed connection with the water outlet pipe (53), and meanwhile, a bayonet (56) which is positioned at one side of the metal meson (55) close to the lower end face of the boiler is arranged in the water inlet joint (51) to realize the fixed connection with the water inlet pipe (54).

13. A small coffee machine according to claim 12, characterized in that:

the thick film instant heating type boiler (5) is a hollow cylinder, and the boiler wall is arranged in a cavity mode so that water flows through the water inlet pipe (54), enters the boiler, circularly flows in the boiler and flows out of the water outlet pipe (53);

the thick film instant heating type boiler (5) is characterized in that the outer wall (551) of the thick film instant heating type boiler (5) is smooth, the surface of one side, facing the outer wall, of the inner wall (552) is in threaded arrangement, and the water outlet pipe (53) and the water inlet pipe (54) are both welded on the inner wall (552) and are bent and formed towards the inside of the cylinder.

14. A small coffee machine according to claim 13, characterized in that:

the instant heating type heating device also comprises a boiler upper cover (57) capable of covering the boiler wall and a boiler lower cover (58) which is assembled and connected with the boiler upper cover (57), wherein the upper end of the thick film instant heating type boiler (5) is fixed on the lower end face of the boiler upper cover (57), and the lower end of the boiler is fixedly assembled with the upper end face of the boiler lower cover (58);

a temperature controller (59) for detecting the water temperature in the thick film instant heating type boiler (5) and a fuse (50) which is connected with the temperature controller (59) and is fused when the temperature controller (59) senses that the water temperature reaches a set value are fixed on the upper boiler cover (57);

the water outlet joint (52) is a two-way joint or a three-way joint, an NTC component (553) is arranged in one of the three-way joints, and the temperature detection part comprises the NTC component (553).

15. A small coffee machine according to claim 1, characterized in that:

the coffee machine also comprises a water inlet pipeline (6) which is arranged in the upper shell (1), extends into the extraction installation part (11) and extends out of the lower end surface of the extraction installation part (11), and a water tank (8) which is vertically arranged in the right shell (22);

the water pump (9) is connected with the instantaneous heating boiler (5) through a water inlet joint (51) and transversely arranged at the bottom of the lower shell (2), the water pump (9) is connected with the water tank (8) so as to press water in the water tank (8) into the instantaneous heating boiler (5) through the water inlet joint (51), and the water inlet pipeline (7) is connected with a water outlet joint (52) and guides water flowing out of the instantaneous heating boiler (5) into the extraction box (3).

16. A small coffee machine according to claim 1, characterized in that: the coffee machine further comprises a power supply control system arranged on the control assembly, the power supply control system comprising a control module (1');

the power supply control system is also provided with a first access port (2 ') for accessing alternating current and a second access port (3') for accessing a battery;

the power supply control system also comprises a power supply access detection module (4 ') and a switch module (5'), wherein the power supply access detection module (4 ') is respectively connected with the first access port (2') and the control module (1 ') and detects and outputs an alternating current access signal to the control module (1');

the switch module (5 ') is respectively connected with the second access port (3 ') and the control module (1 '), and the control module (1 ') controls the switch module (5 ') to be turned off to enable the alternating current to serve as a power supply source and the battery to be not powered when the power access detection module (4 ') detects the alternating current access, and controls the switch module (5 ') to be turned on to enable the battery to serve as the power supply source to be powered when the alternating current is not detected.

17. The power control system of claim 16, wherein:

the power supply control system also comprises an ADC detection module (6 ') which is respectively connected with the control module (1 ') and the second access port (3 ') and used for detecting the electric quantity of the battery and transmitting detection information to the control module, and a charging module (7 ') which is respectively connected with the control module (1 ') and the first access port (2 ') and the second access port (3 ') and is controlled by the control module (1 ') to charge the battery by alternating current when the ADC detection module (6 ') detects that the electric quantity of the battery is insufficient and the alternating current is currently used as a power supply.

18. The power control system of claim 17, wherein:

the power supply access detection module (4 ') comprises a photoelectric coupler (U2), a light emitting diode part of the photoelectric coupler (U2) is connected with alternating current, and a photosensitive triode part is connected with the control module (1');

the ADC detection module (6 ') comprises a voltage division resistor formed by connecting a first resistor (R17) and a second resistor (R13) in series, one end of the voltage division resistor is connected with the second access port (3 ') while the other end is grounded, and a voltage signal acquisition port (BAT _ AD) of the control module (1 ') is connected between the first resistor (R17) and the second resistor (R13);

the charging module (7 ') comprises a voltage-reducing charging module (71') for reducing the voltage of the direct current output after rectifying the alternating current so as to meet the charging voltage requirement of the battery and electrically connected with the second access port (3 '), and a charging switch module (72') which is respectively connected with the first access port (2 ') and the voltage-reducing charging module (71') and the control module (1 ') and enables the first access port (2') and the voltage-reducing charging module (71 ') to be communicated after the control module (1') controls the conduction of the charging module.