A warm water machine and milk foaming machine capable of accurately adjusting temperature

Abstract

The present invention relates to the technical field of warm water equipment, and specifically discloses a warm water machine with accurate temperature adjustment, including a segmented control heater, a heat exchanger and an electric control system, wherein the segmented control heater includes a heating base with multiple heating zones and a water passing member with multiple water passing zones, each heating zone is provided with a heating body and a temperature sensor; a cold water channel of the heat exchanger is fed with preheated cold water by a sub-heater, and the output end of the cold water channel delivers water to another sub-heater, and the hot water channel of the heat exchanger is connected to the boiled water heated by the sub-heater and exchanges heat with the cold water in the cold water channel to output warm water; the electric control system includes a main control circuit connected to each temperature sensor, a switch circuit and a power supply circuit, and the power supply circuit includes a voltage input circuit, a voltage transformation circuit, an optical coupling circuit, a voltage processor and a rectifier circuit, and the main control chip controls the voltage value output by the rectifier circuit to the heating body to adjust the heating temperature of the heating body. Also disclosed is a milk frother including the above-mentioned warm water machine.

Description

Technical Field

[0001] The invention relates to the technical field of warm water equipment, in particular to a warm water machine and a milk foaming machine capable of accurately adjusting the temperature. Background Art

[0002] A warm water machine, also known as a warm water dispenser, is a drinking water device that uses a heat exchanger to cool boiled water to obtain warm water of suitable temperature for immediate drinking by users. The outlet water temperature of a warm water machine mainly depends on the performance of the heat exchanger. The heat energy conversion efficiency of the heat exchanger is mainly determined by the material of the heat conduction mechanism and the water circuit design of the heat exchanger. Under the conditions determined by the heat exchanger, the temperature of the warm water output by the warm water machine mainly depends on the temperature of the cooling water. However, due to the different regions and seasons where the warm water machine is used, the water temperature in the cold water pipeline input to the heat exchanger varies greatly due to the influence of ambient temperature. As a result, the temperature of the warm water output by the same warm water machine in different regions and seasons also varies greatly. Traditional warm water machines have a single function and cannot adjust the output temperature of warm water. It is difficult to meet the needs of users in different regions or meet the needs of users in different seasons, which is not conducive to improving the market competitiveness of the product. Summary of the invention

[0003] Based on this, it is necessary to provide a warm water machine and milk frother that can accurately adjust the temperature to address the technical problem that the outlet temperature of warm water is difficult to control.

[0004] A warm water machine capable of accurately adjusting temperature, comprising:

[0005] A segmented controlled heater, the segmented controlled heater comprises a heating substrate and a water flow member cooperating with the heating substrate to form a plurality of sub-heaters, the heating substrate is provided with a plurality of heating zones at intervals, each of the heating zones is provided with a heating body that generates heat when powered on and a temperature sensor for detecting the water temperature; a plurality of water flow zones corresponding to the heating zones are provided at intervals on the water flow member, the surface of each of the water flow zones is provided with an independent continuous water channel, and a water inlet and a water outlet connected to the continuous water channel are provided on the water flow member at both ends corresponding to each continuous water channel, and the water inlet of one of the sub-heaters is used to connect cold water from the outside, a side wall of the heating substrate facing away from the heating body cooperates with the continuous water channel to form a plurality of closed water channels, and a sealing structure is provided between two adjacent closed water channels;

[0006] A heat exchanger, the heat exchanger comprising at least one heat exchange unit consisting of an isolation plate and a cold water channel and a hot water channel formed on both sides of the isolation plate, the input end of the cold water channel being connected to the water outlet of the sub-heater connected to the water to be heated so as to receive the preheated cold water, the output end of the cold water channel being connected to the water inlet of another sub-heater to provide a heating water source, the input end of the hot water channel being connected to the water outlet of the sub-heater connected to the output end of the cold water channel so as to receive boiled water, the boiled water in the hot water channel being heat-exchanged with the cold water in the cold water channel through the isolation plate, and the output end of the hot water channel outputs direct drinking warm water;

[0007] An electric control system, the electric control system includes a main control circuit with a main control chip and a switching circuit and a power supply circuit electrically connected to the main control chip, the main control chip is electrically connected to the temperature sensors of each sub-heater to receive the temperature signal sent by the temperature sensor, the power supply circuit includes a voltage input circuit electrically connected to an external power supply, a transformer circuit and an optical coupling circuit connected to the voltage input circuit, a voltage processor connected to the transformer circuit and the optical coupling circuit, and a rectifier circuit connected to the voltage processor and the transformer circuit, the output end of the rectifier circuit is respectively connected to the heating body of each sub-heater to provide voltage, and the main control chip is used to control the voltage value output by the rectifier circuit to the heating body to adjust the heating temperature of different heating bodies.

[0008] In one embodiment, the electric control system further includes a zero-crossing detection circuit electrically connected to the main control chip and provided with an optical coupler.

[0009] In one embodiment, the electric control system further includes a communication circuit electrically connected to the main control chip and having a communication serial port, and the main control chip is communicatively connected to an external control terminal via the communication serial port.

[0010] In one embodiment, the warm water machine also includes a water pump electrically connected to the main control chip, and the water pump is used to store normal temperature water input from an external water pipe or water tank, and to deliver cold water to the sub-heater connected to the cold water channel input end at a predetermined flow rate under the control of the main control chip.

[0011] In one of the embodiments, an NTC temperature sensing device is respectively provided at the output end of the water pump and the output end of the hot water channel, and the two NTC temperature sensing devices are respectively electrically connected to the main control chip.

[0012] In one embodiment, the electronic control system further comprises a control panel electrically connected to the main control chip, for inputting temperature control instructions and displaying the water inlet temperature, warm water outlet temperature and water pump flow information of the warm water machine.

[0013] In one of the embodiments, the heating substrate is made of quartz material, food-grade stainless steel material or ceramic material, and the heating body is a thick film slurry coated on the heating substrate, graphene or a resistance wire wound on the heating substrate.

[0014] In one embodiment, the heating substrate and the water flow part are both plate-shaped structures or circular tubular structures or cylindrical structures and circular tubular structures that cooperate with each other. When the heating substrate is a circular tubular structure and the water flow part is a cylindrical structure, the heating substrate is located at the outer layer of the segmented controlled heater, and the water flow part is located at the core of the segmented controlled heater; when the heating substrate and the water flow part are both circular tubular structures, the heating substrate is located at the core of the segmented controlled heater, and the water flow part is located at the outer layer of the segmented controlled heater.

[0015] In one embodiment, a plurality of heat exchange units are stacked, and a heat-conducting metal partition is provided between two adjacent heat exchange units. The input ends of the cold water channels of each heat exchange unit are connected and preheated cold water is introduced into the cold water channel through a sub-heater connected to water to be heated. The output ends of the cold water channels of each heat exchange unit are connected and connected to the water inlet of another sub-heater. The input end of the hot water channel of each heat exchange unit is connected to the sub-heater connected to the output end of the cold water channel to receive boiling water. The output ends of the hot water channels of each heat exchange unit are connected to output warm water for direct drinking.

[0016] The invention also discloses a milk frother comprising the warm water machine.

[0017] The warm water machine and milk frother that can precisely adjust the temperature of the present invention are implemented by setting a segmented control heater to preheat the cold water in the cold water channel entering the heat exchanger, so that the water in the cold water channel is first heated to a predetermined temperature and then heat-exchanges with the hot water in the hot water channel. In this way, the user can control the voltage of the heating body in the sub-heater in the segmented control heater for preheating cold water as needed, so that the temperature of the warm water output by the heat exchanger can reach any desired value, so as to meet the user's demand for warm water in different areas, different seasons and different usage scenarios. The water temperature control of the warm water machine is relatively simple, and the water outlet temperature can be accurately adjusted, thereby improving the quality reliability and market competitiveness of the warm water machine and milk frother. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a warm water machine capable of accurately adjusting the temperature in one embodiment of the present invention;

[0019] Figure 2 A schematic cross-sectional structure diagram of a segmented control heater in one embodiment of the present invention;

[0020] Figure 3 It is a schematic structural diagram of a heating substrate in one embodiment of the present invention;

[0021] Figure 4 It is a schematic structural diagram of a water flow part in one embodiment of the present invention;

[0022] Figure 5 It is a schematic structural diagram of a heating substrate in another embodiment of the present invention;

[0023] Figure 6 It is a schematic cross-sectional structure diagram of a water flow member in another embodiment of the present invention;

[0024] Figure 7 A schematic cross-sectional structure diagram of a heat exchanger in one embodiment of the present invention;

[0025] Figure 8 A schematic diagram of the structure of a cold water plate in one embodiment of the present invention;

[0026] Fig. 9 It is a schematic diagram of the structure of a hot water plate in one embodiment of the present invention;

[0027] Fig.10 A schematic diagram of the structure of an electric control system in one embodiment of the present invention;

[0028] Fig.11 is a circuit schematic diagram of a main control circuit in one embodiment of the present invention;

[0029] Fig.12 is a circuit schematic diagram of a zero-crossing detection circuit in one embodiment of the present invention;

[0030] Fig.13 is a circuit schematic diagram of a communication circuit in one embodiment of the present invention;

[0031] Fig.14 is a circuit schematic diagram of a water pump circuit in one embodiment of the present invention;

[0032] Fig.15 This is a circuit schematic diagram of a water inlet NTC temperature sensing device in one embodiment of the present invention;

[0033] Fig.16 This is a circuit schematic diagram of a water outlet NTC temperature sensing device in one embodiment of the present invention;

[0034] Fig.17 is a circuit schematic diagram of a switch circuit in one embodiment of the present invention;

[0035] Fig.18 FIG. 4 is a circuit schematic diagram of a power supply circuit in one embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0037] See also Figure 1 The present invention discloses a warm water machine 10 capable of precisely adjusting temperature, the warm water machine 10 comprising a segmented control heater 100, a heat exchanger 200 and an electric control system 300, wherein the segmented control heater 100 comprises a plurality of sub-heaters, preferably, the segmented control heater 100 comprises two sub-heaters, one of which is used to access normal temperature water input from an external water pipe or water tank and preheat the normal temperature water, thereby inputting cold water of a predetermined temperature into a cold water channel 220 of the heat exchanger 200, and the segmented control heater 100 comprises a plurality of sub-heaters, preferably, the segmented control heater 100 comprises two sub-heaters, one of which is used to access normal temperature water input from an external water pipe or water tank and preheat the normal temperature water, thereby inputting cold water of a predetermined temperature into a cold water channel 220 of the heat exchanger 200, Another sub-heater of the heat exchanger 200 is used to access the cold water after heat exchange output from the cold water channel 220 and use the cold water as a heating water source. After heating the water, the boiled water is passed into the hot water channel 230 of the heat exchanger 200, so that the hot water in the hot water channel 230 and the preheated cold water in the cold water channel 220 are heat-transferred, so that the heat exchanger 200 outputs warm water of a predetermined temperature. In this way, by controlling the heating temperature of the sub-heater used for preheating water, the heat exchanger 200 can output warm water of any desired temperature. It should be noted that the arbitrary temperature in this embodiment refers to a temperature that satisfies the laws of thermodynamics and conforms to the laws of water heating and heat exchange. Generally speaking, the temperature of warm water should be between 30 degrees Celsius and 80 degrees Celsius. The electric control system 300 is used to control the heating temperature of each sub-heater in the segmented control heater 100, and to control the final output warm water temperature by adjusting the temperature of the preheated cold water.

[0038] See also Figures 2 to 4The segmented control heater 100 includes a heating base 110 and a water flow part 120 that cooperates with the heating base 110 to form a plurality of sub-heaters, and each sub-heater works independently and does not interfere with each other. The heating base 110 is used to generate heat when powered on, so as to provide thermal energy to the water to be heated and achieve heating of the water body. Specifically, a plurality of heating zones 111 are arranged at intervals on the heating base 110, and each heating zone 111 is respectively provided with a heating body 112 that generates heat when powered on and a temperature sensor 113 for detecting the water temperature. The water flow part 120 is used to cooperate with the heating base 110 to form a plurality of sub-heaters, that is, the water flow part 120 is mainly used to pass the water to be heated and provide space for the heating process of the water body. A plurality of water flow areas 121 corresponding to the heating areas 111 are arranged on the water flow element 120 at intervals, that is, each water flow area 121 corresponds to a heating area 111, and the projection of the water flow area 121 in the length direction of the water flow element 120 is larger than the projection of the heating area 111 in the length direction of the heating substrate 110, so as to avoid the problem of excessive local temperature of the heater caused by overheating of the exposed part of the heating area 111 adjacent to the water flow element 120, so as to extend the service life of the equipment. It should be noted that the side of the heating substrate 110 facing away from the heating area 111, that is, the side in contact with the water flow area 121 of the water flow element 120, contacts the water introduced into the continuous water channel 122 and heats the water, taking away the heat on the heating substrate 110, thereby ensuring that the heating area 111 does not overheat, and improving the safety of the heater.

[0039] The surface of each water flow area 121 is provided with an independent continuous water channel 122, and the water flow part 120 is provided with a water inlet 123 and a water outlet 124 connected to the continuous water channel 122 at both ends of each continuous water channel 122, and the water inlet 123 of one of the sub-heaters is used to connect cold water from the outside. The wall surface on the side of the heating substrate 110 facing away from the heating body 112 cooperates with the continuous water channel 122 on the water flow part 120 to form a plurality of closed water channels, and a sealing structure 125 is provided between two adjacent closed water channels. It should be noted that in this embodiment, the heating substrate 110 includes two sections of heating zones 111, and the water flow part 120 includes two sections of water flow areas 121. In actual production, the number of heating zones 111 and water flow areas 121 can be increased according to the need for water temperature control, which will not be repeated here.

[0040] In one embodiment, the heating substrate 110 is made of quartz material, food-grade stainless steel material or ceramic material, and the heating body 112 is a thick film slurry, graphene or a resistance wire wound on the heating substrate 110 coated on the heating substrate 110. Thick film slurry and graphene are both resistance slurries, which generate heat quickly under power-on conditions and generate heat radiation to the heating substrate 110, so that the heating substrate 110 is heated up, thereby generating heat radiation to the water to be heated in contact with the heating substrate 110, so as to achieve the purpose of heating the water. When the resistance wire is wound on the heating substrate 110, after the resistance wire is powered on, when the current passes through the resistance wire, the current does work and consumes electrical energy, thereby generating heat, and generating heat radiation to the heating substrate 110, and then transferring the heat to the water in contact with the heating substrate 110, so as to achieve the heating of the water. It should be noted that, in the present embodiment, regardless of whether the method of coating thick film slurry or graphene or the method of winding resistance wire is adopted, the above-mentioned heating body 112 is not provided in the portion between two adjacent sub-heaters. Thus, during the operation of the segmented control heater 100, the portion of the heating substrate 110 that is not coated with slurry or wound with resistance wire does not generate heat, that is, the temperature variation of the transition portion between two adjacent sub-heaters is small, thereby reducing the amount of heat transfer between two adjacent heating zones 111, and improving the reliability of the segmented heating operation of the segmented control heater 100 of the present embodiment.

[0041] Furthermore, when the heating substrate 110 is made of food-grade stainless steel, 304 stainless steel or 316 stainless steel or other food-grade stainless steel with good high temperature resistance and corrosion resistance can be used to avoid the problem of harmful substances precipitating when the heating substrate 110 contacts the water body, thereby improving the mechanical strength of the heating substrate 110 and the safety of drinking water. In addition, in the present embodiment, an insulating layer 114 is provided on one side of the heating substrate 110 made of food-grade stainless steel material for setting the heating body 112, so as to block the charge conduction between the heating body 112 and the heating substrate 110, so as to avoid the occurrence of leakage accidents of the segmented control heater 100 caused by the water body being charged due to the conduction of the heating substrate 110, so as to improve the safety of the use of the segmented control heater 100.

[0042] In one embodiment, the heating substrate 110 is an integrally formed structure or includes a plurality of detachably connected sub-substrates. When the heating substrate 110 includes a plurality of detachably connected sub-substrates, each sub-substrate is correspondingly provided with a heating area 111, a heating body 112, and a temperature sensor 113; the water flow component 120 is integrally formed or includes a plurality of detachably connected sub-components. When the water flow component 120 includes a plurality of detachably connected sub-components, each sub-component is correspondingly provided with a water flow area 121 and a water inlet 123 and a water outlet 124 connected to a continuous water channel 122 of the water flow area 121. Preferably, when the heating substrate 110 is a detachable structure, the plurality of sub-substrates are connected by means of buckles, screws, or concave-convex fits, and similarly, when the water flow component 120 is a detachable structure, the plurality of sub-components are connected by means of buckles, screws, or concave-convex fits, etc. It can be understood that the heating base 110 and the water flow member 120 can be both an integrated structure, or one of them can be an integrated structure and the other can be a detachable structure, or both can be detachable structures. When the heating base 110 and the water flow member 120 are both detachable structures, multiple sub-heaters that are independent of each other and can be removed separately are actually formed. In this way, users or production personnel can select a corresponding number of heating bases 110 and water flow members 120 to combine according to actual needs, so as to improve the flexibility of using the segmented control heater 100 of this embodiment.

[0043] In one embodiment, the heating substrate 110 and the water flow member 120 are both plate-shaped structures or circular tubular structures or cylindrical structures and circular tubular structures that cooperate with each other. When the heating substrate 110 is a circular tubular structure and the water flow member 120 is a cylindrical structure, the heating substrate 110 is located at the outer layer of the segmented control heater 100, and the water flow member 120 is located at the core of the segmented control heater 100; when the heating substrate 110 and the water flow member 120 are both circular tubular structures, the heating substrate 110 is located at the core of the segmented control heater 100, and the water flow member 120 is located at the outer layer of the segmented control heater 100. Please refer to Figures 2 to 4 When the heating substrate 110 and the water flow member 120 are both plate-shaped structures, the heating substrate 110 is covered on the water flow member 120 and is sealed to the water flow member 120, the surface of the water flow member 120 is recessed to form a continuous water channel 122, and the side of the heating substrate 110 facing away from the heating body 112 is abutted against and blocks the continuous water channel 122 to form a closed water channel. The continuous water channel 122 can be in the form of Figure 4The S-shaped structure shown here includes multiple S-bends, so it can also be understood as a serpentine structure, and can also be a volute structure or a square spiral structure to extend the flow path of the water to be heated in the continuous water channel 122, ensuring uniform heating of the water body, so that the temperature of the water body output from the same closed water channel at the same heating temperature of the heating body 112 is the same, thereby improving the reliability of water temperature control by each sub-heater in the segmented control heater 100. When the heating substrate 110 is in a tubular structure and the water flow member 120 is in a cylindrical structure, the heating body 112 and the temperature sensor 113 are arranged on the outer side of the heating substrate 110, the outer surface of the water flow member 120 protrudes and forms a spiral continuous water channel 122, the water flow member 120 is inserted into the heating substrate 110, and the continuous water channel 122 of the water flow member 120 and the heating area 111 on the inner side of the heating substrate 110 are surrounded to form a plurality of closed water channels, the heating substrate 110 is provided with a water inlet pipe and a water outlet pipe which are connected to the water inlet 123 and the water outlet 124 of the water flow member 120 in a one-to-one correspondence, and the two ends of the heating substrate 110 are sealed. In this case, the heating substrate 110 is located in the outer layer of the segmented control heater 100, the water flow member 120 is located in the core of the segmented control heater 100, and the structure of the heating substrate 110 can be referred to. Figure 5 .

[0044] In another embodiment, when the heating substrate 110 and the water flow member 120 are both tubular structures, the heating body 112 and the temperature sensor 113 are arranged on the inner surface of the heating substrate 110, and the inner surface of the water flow member 120 is raised and surrounded by a continuous water channel 122, which extends the flow path of the water to be heated and makes the heating more uniform. The heating substrate 110 is inserted into the water flow member 120 and the outer surface of the heating substrate 110 and the continuous water channel 122 on the inner surface of the water flow member 120 are surrounded to form a plurality of closed water channels. The two ends of the water flow member 120 are sealed. In this case, the heating substrate 110 is located in the core of the segmented control heater 100, and the water flow member 120 is located in the outer layer of the segmented control heater 100. The structure of the water flow member 120 can be referred to. Figure 6 .

[0045] It should be noted that, when the heating base 110 and the water flow member 120 are both plate-like structures, a straight groove 126 is formed between two adjacent closed water channels and a sealing strip is arranged in the straight groove 126; when the heating base 110 and the water flow member 120 are both tubular structures or cylindrical structures and tubular structures that cooperate with each other, an annular groove 127 is formed on the outer surface or inner surface of the water flow member 120 between two adjacent closed water channels and a sealing ring is arranged in the annular groove 127 to seal the gap between the two adjacent closed water channels to avoid water cross-talk problems.

[0046] The heat exchanger 200 includes at least one heat exchange unit consisting of an isolation plate and a cold water channel 220 and a hot water channel 230 formed on both sides of the isolation plate. The input end of the cold water channel 220 is connected to the water outlet 124 of the sub-heater connected to the water to be heated to receive the preheated cold water. The output end of the cold water channel 220 is connected to the water inlet 123 of another sub-heater to provide a heating water source. The input end of the hot water channel 230 is connected to the water outlet 124 of the sub-heater connected to the output end of the cold water channel 220 to receive boiled water. The boiled water in the hot water channel 230 is heat-exchanged with the cold water in the cold water channel 220 through the isolation plate, and the hot water for direct drinking is output from the output end of the hot water channel 230. It should be noted that the heat exchanger 200 of this embodiment can be either a common heat exchange device in which the water cavity is divided by an isolation plate to form a cold water channel 220 and a hot water channel 230, or a parallel heat exchange device in which a plurality of heat exchange units are stacked and connected in parallel. The structure of the parallel heat exchange device is described below.

[0047] See also Figures 7 to 9 In one embodiment, a plurality of heat exchange units are stacked, and a heat-conducting metal partition 210 is provided between two adjacent heat exchange units. The input end of the cold water channel 220 of each heat exchange unit is connected and preheated cold water is introduced by a sub-heater connected to the water to be heated. The output end of the cold water channel 220 of each heat exchange unit is connected and connected to the water inlet 123 of another sub-heater. The input end of the hot water channel 230 of each heat exchange unit is connected to the sub-heater connected to the output end of the cold water channel 220 to receive boiled water, and the output end of the hot water channel 230 of each heat exchange unit is connected to output warm water for direct drinking. Further, the heat exchanger 200 also includes a first pressing plate 240 and a second pressing plate 250 that are relatively arranged and used to jointly squeeze each heat exchange unit. The first pressing plate 240 and the second pressing plate 250 are fixedly connected by bolts to compress each heat exchange unit, thereby improving the stability of the heat exchanger 200 structure and the sealing of each heat exchange unit.

[0048] See also Figure 8 and Fig. 9The heat exchanger 200 also includes a cold water plate 260 and a hot water plate 270. The cold water plate 260 is arranged between two adjacent metal partitions 210 and has a first hollow portion 280. The first hollow portion 280 and the two adjacent metal partitions 210 together form a cold water channel 220. The hot water plate 270 is arranged between two adjacent metal partitions 210 and has a second hollow portion 290. The second hollow portion 290 and the two adjacent metal partitions 210 together form a hot water channel 230. For the cold water plate 260 or the hot water plate 270 located on both sides of the heat exchanger 200, the cold water plate 260, the metal baffle 210 and the first pressing plate 240 or the second pressing plate 250 respectively enclose the cold water channel 220, and the hot water plate 270, the metal baffle 210 and the first pressing plate 240 or the second pressing plate 250 respectively enclose the hot water channel 230, and the first pressing plate 240, the second pressing plate 250 and the metal baffle 210 are all made of 304 stainless steel or 316 stainless steel or other food-grade stainless steel. The parallel heat exchanger 200 of this embodiment is composed of only two pressing plates and a plurality of heat exchange units arranged between the two pressing plates. The inlet and outlet of two adjacent water channels for the same type of water are connected respectively to realize the parallel connection of the water channels. While realizing the cooling of hot water, the water channel flow area is increased and the distance between the cold water inlet and the warm water outlet of the heat exchanger 200 is shortened. The water flow resistance is small, which is conducive to improving the water outlet efficiency of the heat exchanger 200 and extending the service life of the equipment.

[0049] See also Fig.10The electric control system 300 includes a main control circuit 310 having a main control chip 311, a switch circuit 320 and a power supply circuit 330 electrically connected to the main control chip 311, the main control chip 311 is electrically connected to the temperature sensors 113 of each sub-heater to receive the temperature signal sent by the temperature sensor 113, the power supply circuit 330 includes a voltage input circuit 331 electrically connected to an external power supply, a transformer circuit 332 and an optical coupling circuit 333 connected to the voltage input circuit 331, a voltage processor 334 connected to the transformer circuit 332 and the optical coupling circuit 333, and a rectifier circuit 335 connected to the voltage processor 334 and the transformer circuit 332, the transformer circuit 332 is used to convert the external civilian voltage into a safe voltage suitable for the circuit of the warm water machine 10, the optical coupling circuit 333 is used to filter the input voltage, the voltage processor 334 is used to perform calculations on the converted and filtered voltage, and the rectifier circuit 335 is used to convert alternating current into direct current that can be transmitted to the heating body 112. The output end of the rectifier circuit 335 is respectively connected to the heating body 112 of each sub-heater to provide voltage, and the main control chip 311 is connected to the rectifier circuit 335 to control the voltage value output by the rectifier circuit 335 to the heating body 112, so as to adjust the heating temperature of different heating bodies 112. It should be noted that the main control chip 311 of this embodiment also calculates the cold water preheating temperature according to the voltage value and power, and the warm water temperature output by calculating the hot water temperature and the temperature of the preheated cold water according to the laws of thermodynamics, so as to obtain the functional relationship between the voltage value and the warm water outlet temperature. In this way, in the control process of the warm water machine 10, the user only needs to input a level signal associated with the warm water outlet temperature to the main control chip 311, and the main control chip 311 can be driven to control the voltage value of the heating body 112, so as to achieve the purpose of controlling the outlet water temperature.

[0050] Please also read Figures 11 to 18The electric control system 300 also includes a zero-crossing detection circuit 340 electrically connected to the main control chip 311 and provided with an optical coupler, and a communication circuit 350 electrically connected to the main control chip 311 and having a communication serial port. The main control chip 311 is communicated with the external control terminal through the communication serial port. The warm water machine 10 also includes a water pump 400 electrically connected to the main control chip 311. The water pump 400 is used to store normal temperature water input from an external water pipe or water tank, and under the control of the main control chip 311, delivers cold water to the sub-heater connected to the input end of the cold water channel 220 at a predetermined flow rate. The output end of the water pump 400 and the output end of the hot water channel 230 are respectively provided with an NTC temperature sensing device, and the two NTC temperature sensing devices are respectively electrically connected to the main control chip 311. Specifically, the main control chip 311 adopts an IC chip of model SOP28, wherein pins 7 and 10 of the main control chip 311 are respectively connected to the water outlet NTC temperature sensing device and the water inlet NTC temperature sensing device, pins 8 and 9 of the main control chip 311 are respectively connected to the input end and output end of the water pump 400 circuit, and pins 16 and 18 of the main control chip 311 are respectively connected to the Rxd pin and Txd pin of the communication circuit 350, so that the main control chip 311 can be connected to the external controller through the communication circuit 350 using a communication protocol, such as a serial port based on RS232. Of course, the electric control system 300 of this embodiment can also include a Bluetooth module or / and a wireless signal receiver electrically connected to the main control chip 311, so that a signal can be sent to the main control chip 311 through an intelligent mobile device with a Bluetooth transceiver function or a remote controller with a wireless signal transmission function, so as to realize remote control of the warm water machine 10. Pin 28 of the main control chip 311 is connected to the zero-crossing detection circuit 340, which is used to determine the frequency and voltage inversion point of the single-phase AC power supply, i.e., the zero-crossing point, to achieve voltage zero-point drive or power control, thereby increasing the adjustment range of the main control chip 311 on the voltage value of the heating body 112 and improving the reliability of the electric control system 300. The switch circuit 320 is provided with an integrated circuit IC of model AP2301 / SOT23-5 and connected to the main control chip 311, and a switch connected to the integrated circuit IC, so as to facilitate manual input of instructions so that the voltage value of the heating body 112 can be controlled by the main control chip 311.

[0051] Furthermore, in one embodiment, the electric control system 300 further includes a control panel electrically connected to the main control chip 311, which is used to input temperature control instructions and display the water inlet temperature, the warm water outlet temperature and the flow information of the water pump 400 of the warm water machine 10. Preferably, the control panel is a touch screen, so that while receiving external control signals through the touch screen, the current working parameters of the warm water machine 10 can also be read in real time, so as to facilitate accurate adjustment of the warm water temperature.

[0052] In addition, the present invention also discloses a milk frother including the above-mentioned warm water machine 10, wherein the water outlet 124 of the milk frother is the output end of the hot water channel 230 of the heat exchanger 200 of the warm water machine 10. In this way, the user can input a control instruction to the main control chip 311 of the milk frother to accurately control the water outlet temperature of the milk frother to a predetermined value, so that the output warm water temperature meets the warm water requirement for making milk, thereby avoiding the problem of loss of nutrients in milk powder caused by excessively high hot water temperature for making milk, thereby improving the quality and reliability of the milk frother.

[0053] The warm water machine 10 and milk frother that can precisely adjust the temperature of the present invention are implemented by setting a segmented control heater 100 to preheat the cold water in the cold water channel 220 entering the heat exchanger 200, so that the water in the cold water channel 220 is first heated to a predetermined temperature and then heat-exchanged with the hot water in the hot water channel 230. In this way, the user can control the voltage of the heating body 112 in the sub-heater used for preheating cold water in the segmented control heater 100 as needed, so that the temperature of the warm water output by the heat exchanger 200 can reach any desired value, so as to meet the user's warm water usage needs in different areas, different seasons and different usage scenarios. The water temperature control of the warm water machine 10 is relatively simple, and the outlet water temperature can be accurately adjusted, thereby improving the reliability and market competitiveness of the quality of the warm water machine 10 and the milk frother.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A warm water machine capable of precise temperature adjustment, characterized in that: include: A segmented controlled heater, the segmented controlled heater comprises a heating substrate and a water flow member cooperating with the heating substrate to form a plurality of sub-heaters, the heating substrate is provided with a plurality of heating zones at intervals, each of the heating zones is provided with a heating body that generates heat when powered on and a temperature sensor for detecting the water temperature; a plurality of water flow zones corresponding to the heating zones are provided at intervals on the water flow member, the surface of each of the water flow zones is provided with an independent continuous water channel, and a water inlet and a water outlet connected to the continuous water channel are provided on the water flow member at both ends corresponding to each continuous water channel, and the water inlet of one of the sub-heaters is used to connect cold water from the outside, a side wall of the heating substrate facing away from the heating body cooperates with the continuous water channel to form a plurality of closed water channels, and a sealing structure is provided between two adjacent closed water channels; A heat exchanger, the heat exchanger comprising at least one heat exchange unit consisting of an isolation plate and a cold water channel and a hot water channel formed on both sides of the isolation plate, the input end of the cold water channel being connected to the water outlet of the sub-heater connected to the water to be heated so as to receive the preheated cold water, the output end of the cold water channel being connected to the water inlet of another sub-heater to provide a heating water source, the input end of the hot water channel being connected to the water outlet of the sub-heater connected to the output end of the cold water channel so as to receive boiled water, the boiled water in the hot water channel being heat-exchanged with the cold water in the cold water channel through the isolation plate, and the output end of the hot water channel outputs direct drinking warm water; An electric control system, the electric control system comprising a main control circuit having a main control chip and a switch circuit and a power supply circuit electrically connected to the main control chip, the main control chip being electrically connected to the temperature sensors of the sub-heaters respectively to receive temperature signals sent by the temperature sensors, the power supply circuit comprising a voltage input circuit electrically connected to an external power supply, a voltage conversion circuit and an optical coupling circuit connected to the voltage input circuit, a voltage processor connected to the voltage conversion circuit and the optical coupling circuit, and a rectifier circuit connected to the voltage processor and the voltage conversion circuit, the output ends of the rectifier circuits being respectively connected to the heating bodies of the sub-heaters to provide voltage, the main control chip being used to control the voltage value outputted by the rectifier circuit to the heating bodies so as to adjust the heating temperatures of different heating bodies; The electronic control system can control the heating temperature of the sub-heater used for preheating water so that the heat exchanger can output warm water of any desired temperature.

2. The warm water machine according to claim 1, characterized in that: The electric control system also includes a zero-crossing detection circuit which is electrically connected to the main control chip and is provided with an optical coupler.

3. The warm water machine according to claim 2, characterized in that: The electric control system also includes a communication circuit which is electrically connected to the main control chip and has a communication serial port. The main control chip is communicatively connected to an external control terminal via the communication serial port.

4. The warm water machine according to claim 3, characterized in that: The warm water machine also includes a water pump electrically connected to the main control chip, which is used to store room temperature water input from an external water pipe or water tank, and to deliver cold water to the sub-heater connected to the cold water channel input end at a predetermined flow rate under the control of the main control chip.

5. The warm water machine according to claim 4, characterized in that: An NTC temperature sensing device is respectively provided at the output end of the water pump and the output end of the hot water channel, and the two NTC temperature sensing devices are respectively electrically connected to the main control chip.

6. The warm water machine according to claim 5, characterized in that: The electric control system also includes a control panel electrically connected to the main control chip, which is used to input temperature control instructions and display the water inlet temperature, warm water outlet temperature and water pump flow information of the warm water machine.

7. The warm water machine according to claim 1, characterized in that: The heating substrate is made of quartz material, food-grade stainless steel material or ceramic material, and the heating body is a thick film slurry coated on the heating substrate or a resistance wire wound on the heating substrate.

8. The warm water machine according to claim 1, characterized in that: The heating substrate and the water flow part are both plate-shaped structures or circular tubular structures or are cylindrical structures and circular tubular structures that cooperate with each other. When the heating substrate is a circular tubular structure and the water flow part is a cylindrical structure, the heating substrate is located at the outer layer of the segmented controlled heater, and the water flow part is located at the core of the segmented controlled heater; when the heating substrate and the water flow part are both circular tubular structures, the heating substrate is located at the core of the segmented controlled heater, and the water flow part is located at the outer layer of the segmented controlled heater.

9. The warm water machine according to claim 1, characterized in that: Multiple heat exchange units are stacked, and a heat-conducting metal partition is provided between two adjacent heat exchange units. The input ends of the cold water channels of each heat exchange unit are connected and preheated cold water is introduced into the sub-heater connected to the water to be heated. The output ends of the cold water channels of each heat exchange unit are connected and connected to the water inlet of another sub-heater. The input end of the hot water channel of each heat exchange unit is connected to the sub-heater connected to the output end of the cold water channel to receive boiling water. The output ends of the hot water channels of each heat exchange unit are connected to output warm water for direct drinking.

10. A milk frother, characterized in that: The invention comprises the warm water machine as described in any one of claims 1 to 9.

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