Heating and temperature maintaining boiler assembly for coffee machine and coffee machine

Abstract

The heating and temperature maintaining boiler assembly comprises a primary boiler and a secondary boiler, a temperature maintaining box is arranged on one side of the primary boiler, a constant temperature control system is arranged on the temperature maintaining box, the water temperature in the temperature maintaining box is lower than the water temperature in the secondary boiler, a second pipeline is connected between the temperature maintaining box and the secondary boiler, and a first water pump is arranged on the second pipeline. A circulating water cooling mechanism is connected between the first pipeline and the temperature maintaining box; a third pipeline is connected between the mother boiler and the son boiler, and a first electromagnetic valve is arranged on the third pipeline; circulating water in the circulating water cooling mechanism circularly flows in the cooling sleeve to cool high-temperature water flowing out of the sub-boiler, the stable extraction temperature is kept, and the coffee extraction taste is improved; the temperature maintaining box can provide warm water for the child boiler and the mother boiler, the heating time of water in the child boiler and the mother boiler is shortened, and the heating time can be shortened by supplementing water for increasing the temperature of the child boiler in advance.

Description

Technical Field

[0001] The invention relates to the technical field of coffee machines, in particular to a heating and temperature-maintaining boiler component for a coffee machine and the coffee machine. Background Art

[0002] Coffee is loved by consumers for its unique taste. Using a coffee machine to make coffee is not only convenient but also can ensure the quality of coffee. Therefore, coffee machines are widely used. Coffee machines generally have two functions: one is to extract coffee with hot water, and the other is to use steam to make milk foam. There are several types of coffee machines in the prior art:

[0003] The first type is a coffee machine with a single boiler. The temperature of water used to extract coffee is lower than 100°C. However, if steam is to be generated, the water must be heated to 100°C. Therefore, a single boiler coffee machine has the defect of not being able to provide both hot water and steam at the same time.

[0004] The second type is a coffee machine with a double boiler. A double boiler coffee machine can use one boiler to provide hot water and the other boiler to generate steam. Although a double boiler coffee machine can provide both hot water and steam at the same time, its price is much more expensive than a single boiler coffee machine.

[0005] The third type is a coffee machine with a mother-and-child boiler. The cost of a mother-and-child boiler is much cheaper than that of a double boiler. The mother boiler provides steam and non-extraction hot water, and the child boiler is heated by the mother boiler through heat exchange with the mother boiler. After the heat exchange in the mother boiler, the cold water in the child boiler will exceed 100°C even if it is not further heated by a heating device. This temperature exceeds the optimal temperature for coffee extraction, which results in a poor taste of coffee brewed with hot water at this temperature. Moreover, since cold water is added to both the mother and child boilers, when there is a lack of water when brewing coffee, the heating speed of the cold water is slow, resulting in a longer heating time.

[0006] In Chinese patent CN115886556A, a dual heat exchange mechanism for a coffee machine is disclosed, including a coffee machine boiler body, a heating chamber is provided in the coffee machine boiler body, and an in-bin heating part is provided in the heating chamber. The invention injects water to be used by the coffee machine into the heating chamber in the coffee machine boiler body, heats the water through the in-bin heating part, and after the water temperature in the heating chamber is heated, the hot water is sent to the stamping pump body through the cooling heat exchange part in the pump-connected dual heat exchange assembly. After the cooled hot water passes through the stamping pump body, it flows back to the heating chamber, and is heated by the secondary heating heat exchange part, and then injected into the brewing part for coffee brewing. On the one hand, the invention performs dual heat exchange treatment on the brewing water to achieve stable water temperature, and on the other hand, the overall structure is compact and small in size. However, the invention outputs the hot water heated in the heating chamber and cools it down to make the temperature reach the required brewing temperature, which is obviously a waste of energy. Summary of the invention

[0007] The purpose of the present invention is to solve the problems in the prior art that the temperature of brewing coffee is too high, resulting in a bad taste, and when the boiler is short of water, the added cold water is heated slowly and the heating time is long.

[0008] The present invention achieves the above-mentioned object through the following technical solutions: a heating and temperature-maintaining boiler assembly for a coffee machine, comprising a mother boiler and a sub-boiler arranged in the mother boiler, the mother boiler is provided with a first heating component for heating water in the mother boiler, the sub-boiler is connected to a brewing head through a first pipeline, a temperature-maintaining box is provided on one side of the mother boiler, the temperature-maintaining box is provided with a constant temperature control system for controlling the water temperature in the temperature-maintaining box, the water temperature in the temperature-maintaining box is lower than the water temperature in the sub-boiler, a second pipeline is connected between the temperature-maintaining box and the sub-boiler, and a first water pump for conveying water in the temperature-maintaining box to the sub-boiler is provided on the second pipeline; a circulating water cooling mechanism is connected between the first pipeline and the temperature-maintaining box, the circulating water cooling mechanism comprises a cooling sleeve sleeved on the outside of the first pipeline, a water delivery pipe and a return water pipe are connected between the temperature-maintaining box and the cooling sleeve, and a second water pump for conveying water in the temperature-maintaining box to the cooling sleeve is provided on the water delivery pipe; a third pipeline is connected between the mother boiler and the sub-boiler, and a first solenoid valve is provided on the third pipeline.

[0009] Furthermore, a cavity is opened in the cooling sleeve, one end of the water supply pipe and the return pipe are connected to the cavity, the other end of the water supply pipe and the return pipe are connected to the temperature maintenance box, and the cooling sleeve is put on the outside of the first pipeline.

[0010] Furthermore, a fourth pipeline is connected to the temperature maintenance box, a water pump connected to the fourth pipeline is provided on one side of the temperature maintenance box, the water pump is connected to an external water source to provide water for the temperature maintenance box, and a second solenoid valve is connected to the fourth pipeline.

[0011] Furthermore, the constant temperature control system includes a temperature sensor, a temperature controller and a heater, and the water delivery pump and the second solenoid valve are both electrically connected to the constant temperature control system.

[0012] Furthermore, the water temperature in the temperature maintenance box is maintained at 60 degrees Celsius.

[0013] Furthermore, a diverter valve is installed on the fourth pipeline on one side of the second solenoid valve, and the diverter valve is connected to the mother boiler through a fifth pipeline.

[0014] Furthermore, a water level detector is installed on the temperature maintenance box, a temperature sensor and a water level probe are installed on the mother boiler, a steam pipeline is connected to the mother boiler, a third solenoid valve is also installed on the second pipeline, and a fourth solenoid valve is installed on the first pipeline.

[0015] Furthermore, a pressure relief valve for pressure relief is provided on the top of the mother boiler.

[0016] Furthermore, the temperature-maintaining box is a water tank arranged in the coffee machine.

[0017] A coffee machine uses the coffee machine heating and temperature-maintaining boiler assembly.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, a circulating water cooling mechanism is provided between the temperature-maintaining box and the first pipeline. When brewing coffee, the circulating water in the circulating water cooling mechanism cools down the high-temperature water flowing out of the sub-boiler by circulating in the cooling sleeve, and maintains a stable brewing temperature, thereby improving the coffee extraction taste. In addition, it also reduces the energy consumption required for direct cooling and improves energy utilization efficiency.

[0020] 2. The temperature-maintaining box is connected to the sub-boiler through a second pipeline, and the sub-boiler is connected to the main boiler through a third pipeline, so the temperature-maintaining box can provide warm water to the sub-boiler to shorten the heating time of the water in the sub-boiler. The temperature-maintaining box can also provide warm water to the main boiler, so the heating time of the water in the main boiler can also be shortened. Compared with the double-boiler coffee machine, the power required by the temperature-maintaining box is relatively low. In addition, when the sub-boiler is required to continuously discharge water to brew coffee, it can be preset in advance, so that the sub-boiler can obtain supplementary water with a higher temperature, so that the water in the sub-boiler can quickly rise to a high temperature that meets the brewing requirements, which not only shortens its heating time, but also makes use of the excess high-temperature energy of the extraction water, so that the supplementary water in the sub-boiler can be put into the next coffee brewing as soon as possible.

[0021] 3. The constant temperature control system includes a temperature sensor, a temperature controller and a heater. The water delivery pump and the second solenoid valve are electrically connected to the constant temperature control system, so that it can automatically adjust the water temperature in the temperature maintenance box, realize intelligent management, reduce manual intervention, and improve operational convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the present invention;

[0024] Figure 3 It is a cross-sectional view of the circulating water cooling mechanism in the present invention;

[0025] Figure 4 It is a schematic diagram of the installation position of the present invention in a coffee machine;

[0026] Figure 5 is a schematic diagram of a coffee machine using the present invention;

[0027] Figure 6 This is a schematic diagram of the operation principle of Embodiment 5 of the present invention.

[0028] In the figure: 1-mother boiler, 2-sub-boiler, 3-brewing head, 4-temperature maintenance box, 5-first water pump, 6-circulating water cooling mechanism, 7-water delivery pump, 8-diverter valve, 9-fifth pipeline, 10-temperature sensor, 11-water level probe, 12-third solenoid valve, 13-fourth solenoid valve, 14-pressure relief valve;

[0029] 21 - first pipeline, 41 - second pipeline, 42 - fourth pipeline, 43 - second solenoid valve, 61 - cooling jacket, 62 - water supply pipe, 63 - return pipe, 64 - second water pump, 611 - cavity. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] Embodiment 1

[0033] Combination Figures 1 to 5 A heating and temperature-maintaining boiler assembly for a coffee machine is shown, comprising a mother boiler 1 and a sub-boiler 2 arranged in the mother boiler 1, wherein the mother boiler 1 is provided with a first heating component for heating water in the mother boiler 1, the sub-boiler 2 is connected to a brewing head 3 via a first pipeline 21, a temperature-maintaining box 4 is provided on one side of the mother boiler 1, and the temperature-maintaining box 4 is provided with a constant temperature control system for controlling the water temperature in the temperature-maintaining box 4, and the water temperature in the temperature-maintaining box 4 is lower than the water temperature in the sub-boiler 2;

[0034] like Figure 1-3 As shown, a circulating water cooling mechanism 6 is connected between the first pipeline 21 and the temperature maintenance box 4, and the circulating water cooling mechanism 6 includes a cooling sleeve 61 sleeved on the outside of the first pipeline 21, and a water delivery pipe 62 and a return water pipe 63 are connected between the temperature maintenance box 4 and the cooling sleeve 61. The water delivery pipe 62 is provided with a second water pump 64 for transporting water in the temperature maintenance box 4 to the cooling sleeve 61; specifically, a cavity 611 is opened in the cooling sleeve 61, one end of the water delivery pipe 62 and the return water pipe 63 are connected to the cavity 611, and the other ends of the water delivery pipe 62 and the return water pipe 63 are connected to the temperature maintenance box 4, and the cooling sleeve 61 is sleeved on the outside of the first pipeline 21;

[0035] When in use, the mother boiler 1 utilizes the first heating component to heat the water therein, and the steam generated is used to make milk foam. A pressure relief valve 14 for pressure relief is provided on the top of the mother boiler 1. The mother boiler 1 heats the water for extracting coffee in the sub-boiler 2 through heat exchange. When extraction is needed, due to the long standby time, the water in the sub-boiler 2 will exceed 100°C even if it is not heated by the heating device after the heat exchange in the mother boiler 1. This temperature exceeds the optimal temperature for coffee extraction, which results in a poor taste of the coffee brewed with hot water at this temperature. The temperature of the hot water coming out of the sub-boiler 2 is relatively high, so an additional temperature maintenance box 4 is provided, which is provided with a constant temperature control system. The water temperature can be maintained at a specific temperature all the time, and the temperature is lower than the water temperature in the sub-boiler 2. When the fourth solenoid valve 13 is opened, the water in the sub-boiler 2 will be heated to a temperature higher than 100°C. This temperature exceeds the optimal temperature for coffee extraction. When the hot water in the sub-boiler 2 is transported to the brewing head 3 for coffee extraction by using the first pipeline 21, the circulating water cooling mechanism 6 is started, that is, the second water pump 64 is started, and the water in the temperature maintaining box 4 is transported to the cavity 611 of the cooling sleeve 61 through the water pipe 62. Then, the water in the cavity 611, which is lower than the water temperature in the sub-boiler 2, takes away a small part of the heat of the hot water in the sub-boiler 2 flowing through the first pipeline 21 for coffee extraction through heat exchange, that is, the water for coffee extraction flowing out is cooled, so that the water temperature originally not less than 100°C can be reduced, thereby improving the taste of the extracted coffee; thus, the circulating water cooling mechanism 6 reduces the temperature of the extraction water in the first pipeline 21 by circulating water, reduces the extraction water temperature, and maintains the extraction water temperature at a certain temperature, thereby improving the taste of coffee extraction.

[0036] Embodiment 2

[0037] like Figure 1 As shown, the temperature maintenance box 4 is connected with a fourth pipeline 42, and a water delivery pump 7 connected to the fourth pipeline 42 is provided on one side of the temperature maintenance box 4. The water delivery pump 7 is connected to an external water source to provide water for the temperature maintenance box 4, and a second solenoid valve 43 is connected to the fourth pipeline 42; the constant temperature control system includes a temperature sensor, a temperature controller and a heater, and the water delivery pump 7 and the second solenoid valve 43 are both electrically connected to the constant temperature control system;

[0038] When in use, when the temperature-maintaining box 4 cools down the high-temperature extraction water of the sub-boiler 2 through the circulating water of the circulating water cooling mechanism 6, the temperature of the water returning to the temperature-maintaining box 4 through the return pipe 63 has been increased through heat exchange. After returning to the temperature-maintaining box 4, the temperature of the water in the temperature-maintaining box 4 will gradually increase, thereby reducing the effect of cooling the extraction water in the first pipeline 21. At this time, the constant temperature control system can control the start of the water delivery pump 7 and open the second solenoid valve 43 to add cold water to the temperature-maintaining box 4, so that the water temperature in the temperature-maintaining box 4 is neutralized, and the water temperature in the temperature-maintaining box 4 is maintained at a specific temperature through the detection of the temperature sensor, so as to avoid the situation where the cooling effect on the extraction water is weakened; the water delivery pump 7 can be a rotary pump;

[0039] In addition, the water temperature in the temperature maintenance box 4 can be set to maintain at 60 degrees Celsius. This temperature can be adjusted according to the temperature requirement of the extraction water flowing through the first pipeline 21, thereby changing the temperature of the water for extracting coffee while changing the water temperature in the temperature maintenance box 4, thereby achieving the purpose of regulating the temperature of the extraction water.

[0040] Embodiment 3

[0041] like Figure 1 and Figure 3 As shown, a second pipeline 41 is connected between the temperature-maintaining box 4 and the sub-boiler 2, and a first water pump 5 is provided on the second pipeline 41 to transport water in the temperature-maintaining box 4 to the sub-boiler 2, and a fourth solenoid valve 13 is installed on the first pipeline 21;

[0042] When there is a lack of water in the sub-boiler 2, in the prior art, cold water is added to the sub-boiler 2 through a water pump, and then the water in the sub-boiler 2 is heated by heat exchange between the mother boiler 1 and the sub-boiler 2, which reduces the heating time of the water in the sub-boiler 2 and causes a slower heating speed. In the present embodiment, when in use, when there is a lack of water in the sub-boiler 2, the first water pump 5 is started, and the fourth solenoid valve 13 is opened. The heated warm water of a specific temperature can be directly transported to the sub-boiler 2 through the connection with the sub-boiler 2 through the second pipeline 41. Therefore, when the mother boiler 1 performs heat exchange heating on the sub-boiler 2, the water in the sub-boiler 2 can be quickly heated to the extraction temperature, thereby increasing the heating speed of the water in the sub-boiler 2 and shortening the heating time.

[0043] Embodiment 4

[0044] like Figure 2 As shown, a third pipeline 22 is connected between the mother boiler 1 and the sub-boiler 2, and a first solenoid valve 23 is provided on the third pipeline 22; a temperature sensor 10 and a water level probe 11 are installed on the mother boiler 1;

[0045] When in use, a third pipeline 22 is connected between the mother boiler 1 and the sub-boiler 2, and a first solenoid valve 23 is provided on the third pipeline 22, wherein the first solenoid valve 23 can be a one-way valve, and water only flows from the sub-boiler 2 to the mother boiler 1; when the mother boiler 1 shows a lack of water under the detection of the water level probe 11 due to the continuous formation of steam in the mother boiler 1, the first water pump 5 can be started and the third solenoid valve 12 and the first solenoid valve 23 can be opened to transport the water in the temperature maintenance box 4 to the sub-boiler 2, and then flow from the sub-boiler 2 and the third pipeline 22 into the mother boiler 1 to replenish the mother boiler 1 with water, and the temperature of the incoming water is the temperature set by the temperature maintenance box 4, and its water temperature is higher than the temperature of cold water, so that the water in the mother boiler 1 can be quickly heated, thereby shortening the heating time of the mother boiler 1.

[0046] Embodiment 5

[0047] like Figure 1-3 As shown, when the water in the sub-boiler 2 is extracted for coffee extraction, the circulating water in the circulating water cooling mechanism 6 will cool down the extraction water. At this time, the problem of water consumption of the sub-boiler 2 for coffee extraction will be involved: on the one hand, when only a certain amount of water in the sub-boiler 2 is extracted for coffee extraction, that is, hot water is still left in the sub-boiler 2, and the water level probe detection will not show water shortage;

[0048] On the other hand, when it is necessary to continuously extract water from the sub-boiler 2 for coffee extraction, until the hot water in the sub-boiler 2 is exhausted, the sub-boiler 2 will be in a water shortage state, which will involve two situations A and B. Figure 6 As shown:

[0049] A. When the water in the sub-boiler 2 is used for coffee extraction and is about to be exhausted, and there is no need to continue coffee extraction, that is, there is no urgent need to use the water in the sub-boiler 2 to brew coffee again, then when the hot water in the sub-boiler 2 is extracted for coffee extraction, the circulating water cooling mechanism 6 works as usual, and the circulating water therein cools down the extraction water flowing through the first pipeline 21 as usual when the water in the sub-boiler 2 is extracted for extraction, and the water delivery pump 7 also delivers cold water to the temperature maintenance box 4 as usual under the control of the constant temperature control system to maintain the water temperature in the temperature maintenance box 4;

[0050] B. When the water in the sub-boiler 2 is used to extract coffee and is about to be pumped out, and the water in the sub-boiler 2 needs to be further pumped out for coffee extraction, that is, the operator is in a hurry to use water and hopes that the water added to the sub-boiler 2 can quickly reach above 90 degrees to shorten the heating time. Then, the operator can set it in advance, that is, press the button for preset continuous water extraction. At this time, the water delivery pump 7 will be suspended from delivering cold water to the temperature-maintaining box 4 for neutralizing the water temperature in the temperature-maintaining box 4. Then, when the circulating water cooling mechanism 6 uses the circulating water to cool the extraction temperature, the hot water in the circulating water that returns to the temperature-maintaining box 4 through the return pipe 63 will heat the water in the temperature-maintaining box 4, so that the water temperature in the temperature-maintaining box 4 increases, and as hot water is continuously pumped out from the sub-boiler 2 for coffee extraction, the water temperature in the temperature-maintaining box 4 will continue to increase;

[0051] When the water in the sub-boiler 2 is extracted and pumped out, the high-temperature water in the temperature maintenance box 4 can be immediately transported to the sub-boiler 2 through the first water pump 5. As a result, the high-temperature water in the sub-boiler 2 can quickly reach the temperature required for extraction under the action of heat exchange in the mother boiler 1. When the amount of water in the sub-boiler 2 is sufficient, the operator can cancel the button for preset continuous water extraction, and continue to use the first pipeline 21 to extract water from the sub-boiler 2 for coffee extraction. In this way, the water addition in the sub-boiler 2 can be completed quickly and the added water can quickly reach the extraction water temperature, thereby shortening the heating time for re-filling water.

[0052] Embodiment 6

[0053] like Figure 2 As shown, a diverter valve 8 is installed on the fourth pipeline 42 on one side of the second solenoid valve 43, and the diverter valve 8 is connected to the mother boiler 1 through the fifth pipeline 9; when in use, when adding water to the mother boiler 1, the diverter valve 8 can be used to cut off the water supply to the temperature maintenance box 4, and then the water supply pump 7 can be used to directly add water to the mother boiler 1 through the fifth pipeline 9.

[0054] Embodiment 7

[0055] The temperature-maintaining box 4 is a water tank disposed in the coffee machine. In this embodiment, the water tank in the coffee machine can be used as the temperature-maintaining box 4 in the present invention, thereby replacing the function of the temperature-maintaining box 4.

[0056] And as Figure 4 As shown, the temperature-maintaining box 4 in this coffee machine is independent of the water tank. The coffee machine is not provided with a water tank, but directly uses a water delivery pump 7 to directly deliver external water to the temperature-maintaining box 4;

[0057] In addition, it can be distinguished from the above-mentioned coffee machine in that both a water tank and a temperature maintenance box 4 and a water delivery pump 7 are provided.

[0058] The first water pump 5 and the second water pump 64 in the present invention are both micro water pumps or coffee machine water pumps; the control system used in the coffee machine can be a PLC (Programmable Logic Controller) controller, which receives various input signals and controls the output signals according to the program written by the user, thereby achieving precise control of various components of the coffee machine.

[0059] like Figure 4-5 As shown, a coffee machine is provided, in which the coffee machine heating and temperature-maintaining boiler assembly of the present invention is used.

[0060] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A heating and temperature-maintaining boiler assembly for a coffee machine, comprising a mother boiler (1) and a sub-boiler (2) arranged in the mother boiler (1), wherein the mother boiler (1) is provided with a first heating component for heating water in the mother boiler (1), and the sub-boiler (2) is connected to a brewing head (3) via a first pipeline (21), characterized in that: A temperature maintenance box (4) is provided on one side of the mother boiler (1), and the temperature maintenance box (4) is provided with a constant temperature control system for controlling the water temperature in the temperature maintenance box (4). The water temperature in the temperature maintenance box (4) is lower than the water temperature in the sub-boiler (2). A second pipeline (41) is connected between the temperature maintenance box (4) and the sub-boiler (2), and a first water pump (5) is provided on the second pipeline (41) for transporting the water in the temperature maintenance box (4) to the sub-boiler (2); a circulating water pump (21) is connected between the first pipeline (21) and the temperature maintenance box (4). A temperature maintaining mechanism (6), the circulating water cooling mechanism (6) comprises a cooling sleeve (61) sleeved on the outside of the first pipeline (21), a water supply pipe (62) and a return pipe (63) are connected between the temperature maintaining box (4) and the cooling sleeve (61), and a second water pump (64) is provided on the water supply pipe (62) for conveying water in the temperature maintaining box (4) to the cooling sleeve (61); a third pipeline (22) is connected between the mother boiler (1) and the sub-boiler (2), and a first solenoid valve (23) is provided on the third pipeline (22).

2. The heating and temperature-maintaining boiler assembly for a coffee machine according to claim 1, characterized in that: A cavity (611) is provided in the cooling sleeve (61), one end of the water supply pipe (62) and the return pipe (63) are connected to the cavity (611), the other end of the water supply pipe (62) and the return pipe (63) are connected to the temperature maintenance box (4), and the cooling sleeve (61) is sleeved on the outside of the first pipeline (21).

3. The heating and temperature-maintaining boiler assembly for a coffee machine according to claim 2, characterized in that: The temperature maintenance box (4) is connected to a fourth pipeline (42), one side of the temperature maintenance box (4) is provided with a water supply pump (7) connected to the fourth pipeline (42), the water supply pump (7) is connected to an external water source to provide water for the temperature maintenance box (4), and the fourth pipeline (42) is connected to a second solenoid valve (43).

4. The heating and temperature-maintaining boiler assembly for a coffee machine according to claim 3, characterized in that: The constant temperature control system comprises a temperature sensor, a temperature controller and a heater, and the water delivery pump (7) and the second solenoid valve (43) are both electrically connected to the constant temperature control system.

5. The heating and temperature-maintaining boiler assembly for a coffee machine according to claim 4, characterized in that: The water temperature in the temperature-maintaining box (4) is maintained at 60 degrees Celsius.

6. The heating and temperature-maintaining boiler assembly for a coffee machine according to claim 5, characterized in that: A diverter valve (8) is installed on the fourth pipeline (42) on one side of the second solenoid valve (43), and the diverter valve (8) is connected to the mother boiler (1) through a fifth pipeline (9).

7. The heating and temperature-maintaining boiler assembly for a coffee machine according to claim 1, characterized in that: The temperature maintenance box (4) is equipped with a water level detector, the mother boiler (1) is equipped with a temperature sensor (10) and a water level probe (11), the mother boiler (1) is connected with a steam pipeline, the second pipeline (41) is also equipped with a third solenoid valve (12), and the first pipeline (21) is equipped with a fourth solenoid valve (13).

8. The heating and temperature-maintaining boiler assembly for a coffee machine according to claim 1, characterized in that: A pressure relief valve (14) for pressure relief is arranged on the top of the mother boiler (1).

9. The heating and temperature-maintaining boiler assembly for a coffee machine according to claim 1, characterized in that: The temperature maintenance box (4) is a water tank arranged in the coffee machine.

10. A coffee machine, characterized in that: The coffee machine uses the heating and temperature-maintaining boiler assembly for the coffee machine as described in any one of claims 1 to 9.

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