Background technology
Along with the raising of people's living standard, the quality of people to coffee it is also proposed higher requirement.In general, when making coffee with coffee maker, if water temperature can control between 92 DEG C ~ 96 DEG C, the coffee taste good now brewing out.
But existing coffee machine especially leak through type coffee machine, generally U-shaped heat-generating pipe is all adopted to heat water, U-shaped heat-generating pipe one end is directly connected with water tank, the other end is communicated with coffee machine gondola water faucet, form a water circuit system be communicated with to gondola water faucet from water tank again to U-shaped heat-generating pipe, produce steam pressure after the water in heat-generating pipe is heated, under the effect of steam pressure, water in heat-generating pipe is pushed to and advances and flow through coffee machine gondola water faucet, in the funnel of final inflow contain coffee powder.Because this water circuit system is a system be communicated with, in order to prevent from water tank water out because steam pressure flows backwards, and water can not be pushed to coffee machine gondola water faucet, in the water pipe of joining water box and U-shaped heat-generating pipe, generally will be provided with check valve flow backwards to prevent water road.But this check valve can only control the flow direction of current, prevent it from flowing backwards, the flow velocity of current can not be controlled, to such an extent as to the water velocity of existing coffee machine is unstable, when the water in water tank is more, because hydraulic pressure is comparatively large, cause current very fast through U-shaped heat-generating pipe hourly velocity, water heated time is shorter, causes water temperature can not reach 92 DEG C ~ 96 DEG C these desirable high temperature.On the contrary, when the water in water tank reduces, because hydraulic pressure reduces, current also slow down thereupon, and now, water can fully be heated, even overheated and produce a large amount of steam, and what affect coffee brews effect, can not meet the demand of people to coffee brewing quality.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of coffee machine that the water in water route can be made when infusing coffee to keep constant high temperature.
In order to solve the problems of the technologies described above, the technical scheme that the present invention takes is: a kind of coffee machine, comprise water tank, the water pump be communicated with water tank, main heating element, and the gondola water faucet to be communicated with main heating element, it is characterized in that, the water inlet pipe and water level pipe that longitudinally arrange is connected with in turn between described water pump and main heating element, water inlet pipe is communicated with the top of water level pipe, water inlet pipe and/or water level pipe top are provided with the water level hole be communicated with water tank, water level hole horizontal height is higher than liquid level in water tank, the level height in water level hole is between gondola water faucet spout waterline and the lowest water level line of water inlet pipe and water level pipe connectivity part simultaneously, and gondola water faucet spout waterline is higher than the lowest water level line of water inlet pipe and water level pipe connectivity part.
Described coffee machine also comprises the water level switch be connected with water pump, main heating element respectively by electric-controlled plate, and described water level switch comprises the float being located at water tank bottom and the tongue tube be located at below water tank.
Described water inlet pipe and water level pipe are trough body structure.Further, described water inlet pipe and water level pipe side by side arrangement.
Described water level pipe is connected by Connection Block with between main heating element.
Described main heating element comprises at least one heat-generating pipe.Further, described heat-generating pipe is quartz glass tube, earthenware or two aluminum pipe.
Described machine chassis is provided with warming plate.Further, time heater is provided with bottom described warming plate.
The present invention is connected with the water inlet pipe and water level pipe that top is communicated with in turn between water pump with main heating element, and regulate the range difference between water level in main heating element and gondola water faucet spout waterline by the water level hole on water inlet pipe and/or water level pipe, the height of water level in main heating element is made to remain constant, have how many regardless of the water in water tank, the water yield in main heating element remains constant, further ensuring water in main heating element can thermally equivalent, eliminate the impact of current speed on water temperature to greatest extent, thus ensure that coffee brewage quality.In addition, the present invention is also provided with float in water tank, is controlled the "on" position of water pump and main heating element, prevent dry combustion method with this by the floating state of float.
Detailed description of the invention
below in conjunction with specific embodiments and the drawings, concrete detailed description is further done to the present invention.
Coffee machine as shown in Figure 1, comprise body 4 and the water tank 1 be communicated with successively, water pump 8, water inlet pipe 2, water level pipe 3, main heating element 5 and gondola water faucet 11, the below of gondola water faucet 11 is provided with the funnel 13 in order to contain coffee, the below of funnel 13 is provided with coffee cup 15, hot water flows to funnel 13 and in funnel 13, ground coffee is brewed into coffee liquid, then flows in coffee cup 15.Coffee cup 15 is placed on the warming plate 16 of machine chassis 17, warming plate 16 is made by Heat Conduction Material, the below of warming plate 16 is provided with time heater 18, and secondary heater 18 is mainly used to, for the coffee cup 15 on warming plate 16 provides heat, avoid the coffee liquid in coffee cup 15 to cool rapidly.
For preventing dry combustion method, the present invention is provided with water level switch 7 in the bottom of water tank 1, and water level switch 7 is connected with water pump 8 and main heating element 5 respectively by electric-controlled plate 10.Water level switch described herein comprises the tongue tube being located at float 71 in water tank 1 and water tank 1 bottom, described float 71 forms by magnetisable material with for the plastics of coated magnetic material, because plastics produce buoyancy in water, plastics fluctuate according to the height of the water surface, and magnetisable material moves with float 71.Described tongue tube is a kind of magnet-sensitive switch, and tongue tube makes circuit communication or disconnection under the influence of a magnetic field, and signal is sent to electric-controlled plate 10, and then controls the duty of water pump 8 and main heating element 5.Electric-controlled plate 10 is herein a kind of printed circuit board (PCB)s, is connected respectively with water pump 8 and main heating element 5.
Specifically, when the water level in water tank 1 is higher than float 71, float 71 is in floating state because of buoyancy of water, and now, the tongue tube in water level switch 7 makes water pump 8 and main heating element 5 be in normal power-up state by electric-controlled plate 10.When the water in water tank 1 is lower than float 71 height, float 71 starts to sink, and tongue tube cuts off the power supply of water pump 8 and main heating element 5 under magnetic fields by electric-controlled plate 10, serve the effect avoiding the empty loaded work piece of water pump 8 and main heating element 5 that dry combustion method occurs.
In order to water temperature when realizing coffee brewing keeps constant high temperature, main heating element 5 of the present invention is erect by least one the heat-generating pipe arranged and is formed, if the quantity of heat-generating pipe is more than one, the plurality of heat-generating pipe can be set up in parallel.Heat-generating pipe of the present invention both can be quartz glass tube, also can be earthenware or two aluminum pipe.
In the present embodiment, water inlet pipe 2 and water level pipe 3 are erect side by side and put, wherein the entrance of water inlet pipe 2 is directly communicated with the outlet of water pump 8 or is communicated with by tube connector 9, the outlet of water level pipe 3 is communicated with by Connection Block 19 with the entrance of main heating element 5, the outlet of main heating element 5 is connected with gondola water faucet connector 111, gondola water faucet 11 level is placed in the top of coffee machine, and the water after main heating element 5 heats flows to funnel 13 from the spout 12 of gondola water faucet 11.The water level hole 21 communicated with water tank is provided with in the upper end of water inlet pipe 2 and/or water level pipe 3, height of water level height water tank 1 water surface elevation in water level hole 21, and between spout waterline 122 and the lowest water level line 22 of water inlet pipe 2 and water level pipe 3 connectivity part, and gondola water faucet spout waterline 122 is higher than the lowest water level line 22 of water inlet pipe 2 with water level pipe 3 connectivity part.
According to law of connected vessels, the water in water tank 1 is transported in water level pipe 3 and main heating element 5 through water inlet pipe 2 by water pump 8, also can ensure that the water level in main heating element 5 is unlikely to too high and overflows gondola water faucet 11 spout 12 easily simultaneously.
Water inlet pipe 2 in above-described embodiment and water level pipe 3 are for erect placement side by side, the length of water inlet pipe 2 and water level pipe 3 can be reduced like this and take the space of coffee machine, certainly, as long as water inlet pipe 2 and water level pipe 3 erect to arrange, not must be in juxtaposition.
In addition, the water inlet pipe 2 in the present invention and water level pipe 3 are not limited in tubular structure, also can be set to trough body structure, and this trough body structure both can be one-body molded with body 4, also can be installed on body 4 independently.Trough body structure just changes the shape of water inlet pipe 2 and water level pipe 3, does not change the connectivity structure of water level hole 21 and water inlet pipe 2 and water level pipe 3.
Operation principle of the present invention is: after water pump 8 starts, water in water tank 1 is constantly transported in water inlet pipe 2, flow to as shown by arrow a, when in water inlet pipe 2 be water level exceed lowest water level line 22 with water level pipe 3 connectivity part of water inlet pipe 2 time, water starts to flow into water level pipe 3 and main heating element 5, when the water in water inlet pipe 2 exceedes water level hole 21, water starts to be back to water tank 1, like this, the water level that just can ensure in water inlet pipe 2, water level pipe 3 and main heating element 5 according to law of connected vessels remains on position, water level hole 21.After water heating in main heating element 5, volume expands, and when water is heated to a certain degree, the water in main heating element 5 will be flowed out from spout 12 by gondola water faucet 11.Due to expanding volume and the temperature correlation of water, therefore, flow out from spout 12 after water can being made to be heated to ideal temperature by the height difference H between adjustment main heating element 5 water level and spout waterline 122, and the height difference H between main heating element 5 water level and spout waterline 122 is arranged by the height in water level hole 21 to realize.Because water expanded by heating, the temperature correlation of degrees of expansion and water, this is the common practise known by those skilled in the art, therefore, without the need to highly limiting the concrete of water level hole 21, as long as enable the water after heating spray from gondola water faucet 11, and this point is be easy to realize for the person of ordinary skill of the art.
Below be only specific embodiments of the invention, protection scope of the present invention is not limited thereto, and all insubstantial modifications made on basis of the present invention all will fall into protection scope of the present invention.