Constant-temperature hot water system and control method thereof

Abstract

The invention provides a constant-temperature hot water system and a control method. The constant-temperature hot water system comprises a hot water tank, a heat preservation water tank, a first common water pump set and a heating unit. Wherein the heating water tank, the first common water pump group and the heating unit are sequentially communicated to form a temperature rise loop of the heating water tank; the heating water tank, the first common water pump set, the heating unit and the heat preservation water tank are sequentially communicated to form a water adding loop of the heat preservation water tank. According to the first common water pump set, heating of the heating water tank can be achieved, communication between the heating water tank and the heat preservation water tank can also be achieved, the problem that the heat supply temperature is unstable due to a single-water-tank hot water system in the related technology is solved, and the use comfort of a user is improved; and the use of water pump sets in a double-water-tank hot water system in the related technology can be reduced, the system design is simplified, and the initial investment and the failure rate can be reduced. In other words, according to the constant-temperature hot water system, the more simplified and stable hot water system is achieved through the few water pump sets, and the use experience is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of constant temperature hot water systems, and in particular to a constant temperature hot water system and a control method thereof. Background Art

[0002] Conventional hot water systems generally use a single water tank design. It is difficult to ensure a constant water temperature on the user side when the system is running, resulting in a poor user experience. For this reason, people have proposed a dual-phase hot water system. However, in conventional hot water systems that use dual water tanks, the system design is generally more complicated, and the two water tanks need to be connected by independent water pump groups, resulting in increased initial investment and increased system failure rate. Summary of the invention

[0003] In view of this, in order to solve the technical problem in the prior art that an independent water pump is required to connect the two water tanks in a double-tank hot water system, resulting in increased initial investment and increased system failure rate, the present disclosure provides a constant temperature hot water system and a control method thereof.

[0004] According to a first aspect of an embodiment of the present disclosure, a constant temperature hot water system is provided, the constant temperature hot water system comprising a hot water tank, an insulation water tank, a first common water pump group and a heating unit;

[0005] Among them, the heating water tank, the first common water pump group and the heating unit are connected in sequence to form a heating circuit of the heating water tank; the heating water tank, the first common water pump group, the heating unit and the insulation water tank are connected in sequence to form a water adding circuit of the insulation water tank.

[0006] In an optional embodiment, the constant temperature hot water system includes a first pipeline, a second pipeline and a third pipeline, the first pipeline and the second pipeline constitute a pipeline between the heating unit and the heating water tank, the first pipeline and the third pipeline constitute a pipeline between the heating unit and the insulation water tank, and the first pipeline is located on the upstream side of the second pipeline, the first pipeline is located on the upstream side of the third pipeline, the second pipeline is provided with a first control valve, and the third pipeline is provided with a second control valve.

[0007] In an optional embodiment, the constant temperature hot water system includes a second common water pump group and an insulation unit. The insulation water tank is connected to the water use side through the second common water pump group, and the insulation water tank, the second common water pump group and the insulation unit are connected in sequence to form an insulation circuit of the insulation water tank.

[0008] In an optional embodiment, the constant temperature hot water system includes a fourth pipeline, a fifth pipeline, a sixth pipeline and a seventh pipeline;

[0009] The fourth pipeline is connected to the fifth pipeline, forming a pipeline between the second common water pump group and the water-using side;

[0010] The fourth pipeline is connected to the sixth pipeline, forming a pipeline between the second common water pump group and the water inlet end of the insulation unit, and the seventh pipeline forms a pipeline between the water outlet end of the insulation unit and the insulation water tank, and a third control valve is arranged on the sixth pipeline and / or the seventh pipeline.

[0011] In an optional embodiment, the constant temperature hot water system includes a first pipeline and a third pipeline, the first pipeline and the third pipeline constitute a pipeline between the heating unit and the thermal insulation water tank, and the third pipeline and the seventh pipeline share part of the pipeline;

[0012] Wherein, when the third control valve is arranged in the seventh pipeline, the pipeline outside the common part of the third pipeline is provided with a second control valve, and the pipeline outside the common part of the seventh pipeline is provided with the third control valve.

[0013] In an optional embodiment, the constant temperature hot water system includes an eighth pipeline, a first end of the eighth pipeline is connected to the fifth pipeline, and a second end of the eighth pipeline is connected to the thermal insulation water tank through the second control valve.

[0014] According to a second aspect of an embodiment of the present disclosure, a control method is provided. The control method is applied to the constant temperature hot water system as described in any one of the first aspects. The control method includes:

[0015] When the water temperature of the heating water tank is lower than the heating temperature threshold, the water supply circuit of the heat preservation water tank is shut down, the temperature increase circuit of the heating water tank is turned on, and the first common water pump unit and the heating unit are turned on to increase the water temperature of the heating water tank;

[0016] When the water temperature of the heating water tank is greater than or equal to the heating temperature threshold and the water volume of the insulation water tank is less than the insulation water volume threshold, the water adding circuit is controlled to be turned on, the heating circuit is turned off, the first shared water pump group is turned on, and the heating unit is turned off to increase the water volume of the insulation water tank.

[0017] In an optional embodiment, when the water temperature of the heating water tank is lower than the heating temperature threshold, the water adding circuit of the heat preservation water tank is controlled to be turned off, and the heating circuit of the heating water tank is controlled to be turned on to increase the water temperature of the heating water tank, the control method includes:

[0018] The heating unit is controlled to operate with a set temperature rise gradient to gradually increase the water temperature of the heating water tank until the heating temperature threshold is reached.

[0019] In an optional embodiment, the constant temperature hot water system includes a first pipeline, a second pipeline and a third pipeline, the first pipeline and the second pipeline constitute a pipeline between the heating unit and the heating water tank, the first pipeline and the third pipeline constitute a pipeline between the heating unit and the thermal insulation water tank, and the first pipeline is located on the upstream side of the second pipeline, the second pipeline is provided with a first control valve, and the third pipeline is provided with a second control valve; the control method includes:

[0020] When the water temperature of the heating water tank is lower than the heating temperature threshold, the first control valve is opened and the second control valve is closed to control the water adding circuit to be closed and the heating circuit to be turned on;

[0021] When the water temperature of the heating water tank is greater than or equal to the heating temperature threshold and the water volume of the insulation water tank is less than the insulation water volume threshold, the water adding circuit is controlled to be turned on and the heating circuit to be turned off by opening the second control valve and closing the first control valve.

[0022] In an optional embodiment, the constant temperature hot water system includes a second common water pump group and a heat preservation unit, the heat preservation water tank is connected to the water use side through the second common water pump group, and the heat preservation water tank, the second common water pump group and the heat preservation unit are connected in sequence to form a heat preservation circuit of the heat preservation water tank, and the control method includes:

[0023] When the water volume in the insulation water tank is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank is less than the difference between the insulation temperature threshold and the set temperature, the insulation circuit is controlled to be turned on, the second shared water pump group and the insulation unit are turned on, and the water adding circuit is turned off to increase the water temperature of the insulation water tank until the insulation temperature threshold is reached.

[0024] In an optional embodiment, the constant temperature hot water system includes a fourth pipeline, a fifth pipeline, a sixth pipeline and a seventh pipeline; the fourth pipeline is connected to the fifth pipeline to form a pipeline between the second common water pump group and the water use side; the fourth pipeline is connected to the sixth pipeline to form a pipeline between the second common water pump group and the water inlet end of the insulation unit, the seventh pipeline constitutes a pipeline between the water outlet end of the insulation unit and the insulation water tank, and a third control valve is provided on the sixth pipeline and / or the seventh pipeline; the control method includes:

[0025] When the water volume in the insulation water tank is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank is less than the difference between the insulation temperature threshold and the set temperature, the insulation circuit is controlled to be conductive by opening the third control valve.

[0026] In an optional embodiment, the constant temperature hot water system includes a first pipeline and a third pipeline, the first pipeline and the third pipeline constitute a pipeline between the heating unit and the thermal insulation water tank, and the third pipeline and the seventh pipeline share a portion of the pipeline; when the third control valve is set on the seventh pipeline, the pipeline outside the shared portion of the third pipeline is provided with a second control valve, and the pipeline outside the shared portion of the seventh pipeline is provided with the third control valve; the control method includes:

[0027] When the water volume in the insulated water tank is greater than or equal to the insulation water volume threshold, and the water temperature of the insulated water tank is less than the difference between the insulation temperature threshold and the set temperature, the water addition circuit is shut off and the insulation circuit is turned on by closing the second control valve and opening the third control valve.

[0028] In an optional embodiment, the constant temperature hot water system includes an eighth pipeline, a first end of the eighth pipeline is connected to the fifth pipeline, and a second end of the eighth pipeline is connected to the thermal insulation water tank through the third control valve; the control method includes:

[0029] When the water volume in the insulated water tank is greater than or equal to the insulated water volume threshold and the water temperature in the insulated water tank reaches the insulated temperature threshold, the third control valve is closed and the second control valve is opened to provide water source for the water-using side.

[0030] The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: In the present disclosure, the temperature-raising circuit of the heating water tank and the water-adding circuit of the insulation water tank may share the same water pump group, namely, the first common water pump group. When the heating water tank needs to be heated, the first common water pump group will increase the water temperature of the heating water tank through the temperature-raising circuit; when the insulation water tank needs to be filled with water, the first common water pump group will transport the hot water in the heating water tank to the insulation water tank through the water-adding circuit to increase the water volume of the insulation water tank. The first common water pump group of the present disclosure can not only realize the heating of the heating water tank, but also realize the connection between the heating water tank and the insulation water tank, that is, solve the problem of unstable heating temperature caused by the hot water system of the single water tank in the related art, improve the user's comfort, and reduce the use of water pump groups in the hot water system of the double water tank in the related art, simplify the system design, and reduce the initial investment and failure rate. That is, the constant temperature hot water system of the present disclosure uses fewer water pump groups to realize a more simplified and stable hot water system, improving the user experience.

[0031] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0035] Figure 1 is a schematic diagram of a constant temperature hot water system according to an exemplary embodiment.

[0036] Figure 2 is another schematic diagram of a constant temperature hot water system according to an exemplary embodiment.

[0037] Figure 3 is a schematic diagram of a control method for a constant temperature hot water system according to an exemplary embodiment.

[0038] Reference numerals:

[0039] 11. The first common water pump unit; 12. The second common water pump unit;

[0040] 21. Heating unit; 22. Insulation unit;

[0041] 31. Heating water tank; 32. Insulation water tank;

[0042] 41. a first temperature sensor; 42. a second temperature sensor; 43. a third temperature sensor; 44. a fourth temperature sensor;

[0043] 51. First water level switch; 52. Second water level switch;

[0044] 60. Pressure sensor;

[0045] 70. Water side;

[0046] 81, first control valve; 82, second control valve; 83, third control valve; 84, fourth control valve;

[0047] 91, first pipeline; 92, second pipeline; 93, third pipeline; 94, fourth pipeline; 95, fifth pipeline; 96, sixth pipeline; 97, seventh pipeline; 98, eighth pipeline; 99, ninth pipeline;

[0048] 100. Share some pipelines. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0050] The disclosure below provides many different embodiments or examples to implement different schemes of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0051] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0052] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0053] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0054] In order to solve the technical problem in the prior art that a dual-tank hot water system requires an independent water pump to connect the two water tanks, resulting in increased initial investment and increased system failure rate, the present disclosure provides a constant temperature hot water system and a control method thereof.

[0055] Among them, in the present disclosure, the temperature increase circuit of the heating water tank and the water adding circuit of the insulation water tank can share the same water pump group, that is, the first shared water pump group. When the heating water tank needs to be heated, the first shared water pump group will increase the water temperature of the heating water tank through the temperature increase circuit; when the insulation water tank needs to be filled with water, the first shared water pump group will transport the hot water in the heating water tank to the insulation water tank through the water adding circuit to increase the water volume of the insulation water tank. The first shared water pump group of the present disclosure can not only realize the heating of the heating water tank, but also realize the connection between the heating water tank and the insulation water tank, that is, solve the problem of unstable heating temperature caused by the hot water system of the single water tank in the related art, improve the user's comfort, and reduce the use of water pump groups in the hot water system of the double water tank in the related art, simplify the system design, and can reduce the initial investment and failure rate. That is, the constant temperature hot water system of the present disclosure uses fewer water pump groups to achieve a more simplified and stable hot water system, thereby improving the user experience.

[0056] In an exemplary embodiment, reference Figures 1 to 3 As shown, a constant temperature hot water system is provided, which includes a hot water tank, an insulated water tank 32, a first common water pump group 11 and a heating unit 21. The hot water tank is used to store hot water and provide a hot water source for the entire system. The insulated water tank 32 is used to store insulated hot water to meet the water needs of users. The first common water pump group 11 is used to drive the flow of water in the system. The heating unit 21 is used to increase the temperature of the water.

[0057] The heating water tank 31, the first common water pump group 11 and the heating unit 21 are connected in sequence to form a heating circuit for the heating water tank 31. When the heating water tank 31 needs to be heated, the first common water pump group 11 drives the water in the heating water tank 31 to circulate in the heating circuit, thereby raising the water temperature through the heating unit 21 in the heating circuit to increase the water temperature of the heating water tank 31.

[0058] Among them, the heating water tank 31, the first common water pump group 11, the heating unit 21 and the insulation water tank 32 are connected in sequence to form a water adding circuit for the insulation water tank 32. When the insulation water tank 32 needs to be filled with water, the first common water pump group 11 drives the water in the heating water tank 31 to flow in the water adding circuit, thereby transporting the hot water in the heating water tank 31 to the insulation water tank 32 to increase the water volume in the insulation water tank 32. It should be noted that in this case, it is possible to first ensure that the water temperature of the heating water tank 31 meets the standard, so that when adding water to the insulation water tank 32, the heating unit 21 can be controlled to be turned off to reduce energy consumption.

[0059] In this embodiment, the constant temperature hot water system can monitor the water temperature of the heating water tank 31 and the insulation water tank 32 in real time through a temperature sensor (recorded as the first temperature sensor 41). When the water temperature of the heating water tank 31 is less than the heating temperature threshold, the heating circuit can be started and the heating unit 21 can be turned on for heating. That is, the water supply circuit of the insulation water tank 32 can be controlled to be turned off, the heating circuit of the heating water tank 31 can be turned on, and the first common water pump group 11 and the heating unit 21 can be turned on to increase the water temperature of the heating water tank 31.

[0060] In some embodiments,

[0061] refer to Figures 1 to 3 As shown, when the temperature sensor detects that the water temperature of the heating water tank 31 is less than the heating temperature threshold, the control unit of the constant temperature hot water system can issue an instruction to control the water supply circuit of the insulated water tank 32 to be shut down, for example, by closing the corresponding valve to prevent water from flowing in the water supply circuit. The heating circuit of the heating water tank 31 can also be controlled to be turned on, and the corresponding valve can be opened to ensure that water can flow in the heating circuit. Among them, the first common water pump group 11 and the heating unit 21 can be turned on, and the first common water pump group 11 drives the water of the heating water tank 31 to circulate in the heating circuit. When passing through the heating unit 21, the heating unit 21 heats the water, thereby increasing the water temperature of the heating water tank 31.

[0062] This embodiment can effectively improve energy efficiency and avoid unnecessary energy waste by accurately controlling the water temperature of the heating water tank 31 and automatically starting the heating circuit when the water temperature is lower than the heating temperature threshold. This embodiment can ensure that the heating water tank 31 always provides a stable hot water temperature to meet the user's water demand and improve the user's experience.

[0063] Among them, in this embodiment, the constant temperature hot water system can monitor the water volume of the insulated water tank 32 through a water level detection device. When the water volume of the insulated water tank 32 is less than the insulation water volume threshold and the water temperature of the heating water tank 31 is greater than or equal to the heating temperature threshold, the water adding circuit can be controlled to be turned on, the heating circuit can be turned off, the first common water pump group 11 can be turned on, and the heating unit 21 can be turned off to increase the water volume in the insulation water tank 32.

[0064] Among them, controlling the water adding circuit to be turned on can ensure that hot water can flow from the heating water tank 31 to the insulation water tank 32. Controlling the temperature increase circuit to be turned off can avoid unnecessary heating of the heating water tank 31 at this time; and controlling the first common water pump group 11 to be turned on, driving the hot water to flow in the water adding circuit, and delivering the hot water in the heating water tank 31 to the insulation water tank 32, thereby increasing the water volume of the insulation water tank 32. At the same time, controlling the heating unit 21 to be turned off can avoid unnecessary energy consumption and achieve the purpose of energy saving.

[0065] This embodiment can automatically adjust the operating frequency of the first common water pump group 11 according to the user's water demand and the operating state of the system to achieve precise control of the flow rate. The constant temperature hot water system of this embodiment realizes the heating of the heating water tank 31 and the water adding function of the insulation water tank 32 through reasonable design and control. When adding water to the insulation water tank 32, the heating unit 21 is turned off to reduce energy consumption. In addition, the constant temperature hot water system operates stably and can provide constant temperature hot water to meet the user's water demand.

[0066] The first common water pump group 11 in the constant temperature hot water system can not only heat the heating water tank 31, but also connect the heating water tank 31 with the insulation water tank 32, which solves the problem of unstable heating temperature caused by the hot water system with a single water tank in the related art, improves the user's comfort, and reduces the use of water pump groups in the hot water system with two water tanks in the related art, simplifies the system design, and can reduce the initial investment and failure rate. That is, the constant temperature hot water system of this embodiment uses fewer water pump groups to achieve a more simplified and stable hot water system, improving the user experience.

[0067] In an exemplary embodiment, a constant temperature hot water system and a control method thereof are provided. Figures 1 to 3 As shown, the constant temperature hot water system may include a first pipeline 91 and a second pipeline 92, the first pipeline 91 and the second pipeline 92 constitute a pipeline between the heating unit 21 and the heating water tank 31, and the first pipeline 91 is located at the upstream side of the second pipeline 92, and the second pipeline 92 is provided with a first control valve 81. The first control valve 81 can be used to control the conduction and shutoff of the temperature increase circuit.

[0068] The constant temperature hot water system may further include a third pipeline 93. The first pipeline 91 and the third pipeline 93 constitute a pipeline between the heating unit 21 and the thermal insulation water tank 32, and a second control valve 82 is provided on the third pipeline 93. The second control valve 82 can be used to control the conduction and shutoff of the water supply circuit.

[0069] In this embodiment, when the water temperature of the heating water tank 31 is lower than the heating temperature threshold, the first control valve 81 is opened and the second control valve 82 is closed to control the water adding circuit to be shut off and the heating circuit to be turned on, so as to increase the water temperature of the heating water tank 31 and prevent the water from being transported to the insulation water tank 32.

[0070] When the water temperature of the heating water tank 31 is greater than or equal to the heating temperature threshold and the water volume of the insulation water tank 32 is less than the insulation water volume threshold, the water adding circuit is controlled to be turned on and the heating circuit is turned off by opening the second control valve 82 and closing the first control valve 81, so as to transport the hot water in the heating water tank 31 to the insulation water tank 32, thereby increasing the water volume in the insulation water tank 32.

[0071] This embodiment can realize intelligent switching of the heating circuit and the water adding circuit by precisely controlling the first control valve 81 and the second control valve 82, and can meet different requirements of the heating water tank 31 and the insulation water tank 32 through the first common water pump group 11 according to different situations. The number of water pumps can be reduced, and the stable operation of the hot water system and the reasonable control of water temperature and water volume can be ensured.

[0072] In addition, when the water temperature of the heating water tank 31 is lower than the heating temperature threshold, the water adding circuit of the heat preservation water tank 32 is controlled to be shut off, and the heating circuit of the heating water tank 31 is controlled to be turned on to increase the water temperature of the heating water tank 31. The heating unit 21 can be controlled to operate with a set temperature increase gradient to gradually increase the water temperature of the heating water tank 31 until the heating temperature threshold is reached.

[0073] That is to say, if the water temperature of the heating water tank 31 is far from the heating temperature threshold, and the amount of water in the heating circuit is also large during this process, the heating unit 21 can be set to operate according to the set heating gradient (for example, 5°C). In this way, in the early stage of heating, the evaporation temperature of the heating unit 21 is relatively low, and the compressor pressure of the heating pump of the heating unit 21 is relatively small. Therefore, the energy efficiency of the heating unit 21 in the early stage of heating is relatively high. Compared with the conventional circulating heating system with 60°C water outlet and 55°C return water, the one-time step heating system of this embodiment is more energy-efficient, which can improve energy utilization efficiency and avoid unnecessary energy waste.

[0074] In an exemplary embodiment, a constant temperature hot water system and a control method thereof are provided. Figures 1 to 3As shown, the constant temperature hot water system may include a second common water pump group 12 and an insulation unit 22. The insulation water tank 32 is connected to the water use side 70 through the second common water pump group 12, that is, the second common water pump can drive the water in the insulation water tank 32 to be transported to the water use side 70 to meet the normal water use of the water use side 70.

[0075] Among them, the insulation water tank 32, the second common water pump group 12 and the insulation unit 22 can be connected in sequence to form an insulation circuit of the insulation water tank 32. That is, the second common water pump can drive the water in the insulation water tank 32 to circulate between the insulation water tank 32 and the insulation unit 22, thereby ensuring the water temperature of the insulation water tank 32.

[0076] Among them, when the water volume of the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 is less than the difference between the insulation temperature threshold and the set temperature, it means that the water volume of the insulation water tank 32 is sufficient, but the temperature is low, and it needs to be heated to ensure that the water temperature of the insulation water tank 32 is at a suitable temperature. In this case, the insulation circuit can be controlled to be turned on, the second common water pump group 12 can be turned on, and the water adding circuit can be turned off to increase the water temperature of the insulation water tank 32 until the insulation temperature threshold is reached.

[0077] It should be noted that the insulation temperature threshold and the set temperature difference can be set according to actual needs, and their specific values ​​are not limited.

[0078] In some embodiments,

[0079] refer to Figures 1 to 3 As shown, the constant temperature hot water system may include a control device and a water level switch (referred to as the second water level switch 52) for real-time monitoring of the amount of water in the thermal insulation water tank 32, and a temperature sensor (referred to as the second temperature sensor 42) for real-time monitoring of the water temperature in the thermal insulation water tank 32. The control device may be electrically connected to the water level switch, and the control device may also be electrically connected to the temperature sensor.

[0080] When the water volume of the insulation water tank 32 detected by the water level switch is greater than or equal to the insulation water volume threshold, and the temperature sensor detects that the water temperature of the insulation water tank 32 is less than the insulation temperature threshold and the set temperature difference, the control device can determine that the water volume of the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 is less than the insulation temperature threshold and the set temperature difference based on the information detected by the above water level switch and temperature sensor, which means that the water volume of the insulation water tank 32 is sufficient but the temperature is low, and it needs to be heated. At this time, the control device can control the insulation circuit to be turned on to ensure that water can circulate between the insulation water tank 32 and the insulation unit 22; and can turn on the second common water pump group 12 to drive the water in the insulation water tank 32 to flow in the insulation circuit; and can control the water adding circuit to be turned off to avoid adding water to the insulation water tank 32 at this time, affecting the heating effect. In this embodiment, when water passes through the insulation unit 22 in the insulation circuit, the insulation unit 22 heats the water, thereby increasing the water temperature in the insulation water tank 32 until the insulation temperature threshold is reached.

[0081] This embodiment can timely heat up the insulation water tank 32 to ensure that the water temperature is within a suitable temperature range by precisely controlling the conduction of the insulation circuit and the opening of the second common water pump group 12 when the insulation water tank 32 has sufficient water but a low temperature. This embodiment can improve the stability and reliability of the hot water system and meet the hot water demand of the water-using side 70.

[0082] Among them, since the insulation circuit is controlled to be turned on only when the water temperature of the insulation water tank 32 is less than the difference between the insulation temperature threshold and the set temperature, when the insulation circuit is turned on, it means that the water temperature of the insulation water tank 32 does not meet the standard, and water may not be provided to the water-using side 70. That is, in this case, the pipeline between the insulation water tank 32 and the water-using side 70 may be shut off. For example, a control valve may be provided on the water-using side 70, such as the fourth control valve 84 (not shown in the figure), and the fourth control valve 84 may be closed to prevent the water-using side 70 from misusing water that does not meet the temperature standard.

[0083] In addition, in this embodiment, when the insulation circuit is turned on and the water adding circuit is turned off, the heating circuit of the heating water tank 31 can be controlled according to the actual situation. For example, if the water temperature of the heating water tank 31 is less than the heating temperature threshold, the heating circuit of the heating water tank 31 can be controlled to be turned on, and the first common water pump group 11 and the heating unit 21 can be turned on to increase the water temperature of the heating water tank 31. If the water temperature of the heating water tank 31 is greater than or equal to the heating temperature threshold, the heating circuit of the heating water tank 31 can be controlled to be turned off, and the first common water pump group 11 and the heating unit 21 can be turned off.

[0084] In an exemplary embodiment, a constant temperature hot water system and a control method thereof are provided. Figures 1 to 3As shown, the constant temperature hot water system may include a fourth pipeline 94 , a fifth pipeline 95 , a sixth pipeline 96 and a seventh pipeline 97 .

[0085] The fourth pipeline 94 and the fifth pipeline 95 are connected to form a pipeline between the second common water pump group 12 and the water-using side 70 , so as to transport the water in the insulated water tank 32 to the water-using side 70 through the second common water pump group 12 .

[0086] Among them, the fourth pipeline 94 and the sixth pipeline 96 are connected to form a pipeline between the second common water pump group 12 and the water inlet end of the insulation unit 22, the seventh pipeline 97 forms a pipeline between the water outlet end of the insulation unit 22 and the insulation water tank 32, and a third control valve 83 is arranged on the sixth pipeline 96 and / or the seventh pipeline 97.

[0087] In this embodiment, when the water volume in the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 is less than the difference between the insulation temperature threshold and the set temperature, the insulation circuit can be controlled by opening the third control valve 83, thereby achieving precise control of the insulation circuit.

[0088] In some embodiments, reference Figures 1 to 3 As shown, the water volume of the insulation water tank 32 can be monitored in real time by the water level switch, and the water temperature of the insulation water tank 32 can be monitored in real time by the temperature sensor. When the water volume of the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 is less than the difference between the insulation temperature threshold and the set temperature, it means that the insulation water tank 32 needs to be heated. At this time, the control device can open the third control valve 83, so that the fourth pipeline 94, the sixth pipeline 96, the insulation unit 22 and the seventh pipeline 97 form a conductive insulation circuit; and the second common water pump group 12 can be started to drive the water of the insulation water tank 32 to circulate in the insulation circuit. When the water passes through the insulation unit 22 in the insulation circuit, the insulation unit 22 heats the water to increase the water temperature of the insulation water tank 32 until the insulation temperature threshold is reached.

[0089] This embodiment can accurately control the conduction of the insulation circuit by setting a specific pipeline connection and the third control valve 83, ensuring that when the insulation water tank 32 needs to be heated, heat can be efficiently transferred to improve energy utilization efficiency. This embodiment can well ensure that the water temperature of the insulation water tank 32 is stable within a suitable range, provide stable constant temperature hot water for the water side 70, and improve user satisfaction.

[0090] In an exemplary embodiment, a constant temperature hot water system and a control method thereof are provided. Figures 1 to 3As shown, the constant temperature hot water system may include a first pipeline 91 and a third pipeline 93 , the first pipeline 91 and the third pipeline 93 constitute a pipeline between the heating unit 21 and the insulated water tank 32 , and the third pipeline 93 and the seventh pipeline 97 share part of the pipeline 100 .

[0091] When the third control valve 83 is disposed in the seventh pipeline 97 , the second control valve 82 is disposed in the pipeline outside the common part pipeline 100 of the third pipeline 93 , and the third control valve 83 is disposed in the pipeline outside the common part pipeline 100 of the seventh pipeline 97 .

[0092] In this embodiment, when the water volume in the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 is less than the difference between the insulation temperature threshold and the set temperature, the water adding circuit is shut off and the insulation circuit is turned on by closing the second control valve 82 and opening the third control valve 83.

[0093] Among them, the water volume of the insulation water tank 32 can be monitored in real time by the water level switch, and the water temperature of the insulation water tank 32 can be monitored in real time by the temperature sensor. When the water volume of the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 is less than the insulation temperature threshold and the set temperature difference, it is necessary to heat the insulation water tank 32 and ensure that no water addition operation is performed at this time. In this case, the second control valve 82 can be closed to cut off the water addition circuit to prevent the water in the heating water tank 31 from flowing into the insulation water tank 32 and affecting the heating operation of the insulation water tank 32. And open the third control valve 83 to make the seventh pipeline 97 conductive, so as to realize the conduction of the insulation circuit. The insulation circuit includes the fourth pipeline 94, the sixth pipeline 96, the insulation unit 22, the seventh pipeline 97 and the insulation water tank 32. And the second common water pump group 12 can be started to drive the water in the insulation water tank 32 to circulate in the insulation circuit. The water is heated when passing through the heat preservation unit 22, and the water temperature of the heat preservation water tank 32 is increased until the heat preservation temperature threshold is reached.

[0094] In this embodiment, by precisely controlling the states of the second control valve 82 and the third control valve 83, the water supply circuit and the insulation circuit can be accurately switched on and off under certain circumstances, thereby improving the operating efficiency and stability of the system. This embodiment can ensure that the water temperature of the insulation water tank 32 is always maintained within a suitable range, providing users with stable constant temperature hot water while avoiding energy waste.

[0095] In an exemplary embodiment, a constant temperature hot water system and a control method thereof are provided. Figures 1 to 3 As shown, the constant temperature hot water system may include an eighth pipeline 98 , a first end of the eighth pipeline 98 is connected to the fifth pipeline 95 , and a second end of the eighth pipeline 98 is connected to the insulated water tank 32 via a second control valve 82 .

[0096] Among them, when the water volume in the insulated water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulated water tank 32 reaches the insulation temperature threshold, it means that the water volume and water temperature of the insulated water tank 32 meet the requirements, and the third control valve 83 can be closed and the second control valve 82 can be opened to provide water source for the water use side 70.

[0097] Among them, in this embodiment, the water volume and water temperature of the insulation water tank 32 can be monitored in real time. When the water volume of the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 reaches the insulation temperature threshold, it means that the water volume and water temperature of the insulation water tank 32 meet the requirements. At this time, the third control valve 82 can be closed, so that the insulation circuit between the fourth pipeline 94, the sixth pipeline 96, the heating unit 21, the eighth pipeline 98 and the insulation water tank 32 is shut off to prevent hot water from flowing back to the insulation water tank 32. And the second control valve 82 can be opened, the eighth pipeline 98 and the insulation water tank 32 are connected, and the second common water pump group 12 is started to transport the hot water in the insulation water tank 32 to the water side 70 through the fourth pipeline 94 and the fifth pipeline 95, and the hot water in the insulation water tank 32 is circulated between the insulation water tank 32, the fourth pipeline 94, the fifth pipeline 95 and the eighth pipeline 98, to ensure that the user has a stable constant temperature hot water supply when using it.

[0098] This embodiment can provide a stable hot water supply to the water-using side 70 in a timely manner when the insulated water tank 32 meets the conditions by accurately monitoring the state of the insulated water tank 32 and controlling the opening and closing of the second control valve 82 and the third control valve 83. This improves the intelligence and operation efficiency of the hot water system and meets the user's demand for hot water.

[0099] In an exemplary embodiment, a constant temperature hot water system and a control method thereof are provided. Figures 1 to 3 As shown, the constant temperature hot water system may include a hot water tank, an insulation water tank 32 , a first common water pump group 11 , a heating unit 21 , a second common water pump group 12 and an insulation unit 22 .

[0100] Among them, the heating water tank 31, the first common water pump group 11 and the heating unit 21 are connected in sequence to form a heating circuit of the heating water tank 31, which is used to heat the water in the heating water tank 31. The heating water tank 31, the first common water pump group 11, the heating unit 21 and the insulation water tank 32 are connected in sequence to form a water adding circuit of the insulation water tank 32, which is used to add water to the insulation water tank 32. It can be seen that this embodiment can realize both heating the water in the heating water tank 31 and adding water to the insulation water tank 32 through the first common water pump group 11. In other words, this embodiment can realize the heating of the heating water tank 31 and the connection between the heating water tank 31 and the insulation water tank 32 through a group of water pump groups.

[0101] Among them, the heat preservation water tank 32 is connected to the water-using side 70 through the second common water pump group 12, and the heat preservation water tank 32, the second common water pump group 12 and the heat preservation unit 22 are connected in sequence to form a heat preservation circuit of the heat preservation water tank 32. It can be seen that the second common water pump group 12 can not only realize the water use of the water-using side 70, but also realize the heat preservation of the heat preservation water tank 32. In other words, this embodiment can realize the water supply to the water-using side 70 and the heat preservation of the heat preservation water tank 32 through a set of water pump groups.

[0102] In addition, the constant temperature hot water system may further include a first pipeline 91 , a second pipeline 92 , a third pipeline 93 , a fourth pipeline 94 , a fifth pipeline 95 , a sixth pipeline 96 , a seventh pipeline 97 and an eighth pipeline 98 .

[0103] The first pipeline 91 and the second pipeline 92 constitute a pipeline between the heating unit 21 and the heating water tank 31, that is, the water outlet of the heating unit 21 is connected to the heating water tank 31 through the first pipeline 91 and the second pipeline 92. The first pipeline 91 and the third pipeline 93 constitute a pipeline between the heating unit 21 and the insulation water tank 32, that is, the water outlet of the heating unit 21 is connected to the insulation water tank 32 through the first pipeline 91 and the third pipeline 93.

[0104] The first pipeline 91 is located at the upstream side of the second pipeline 92, the first pipeline 91 is located at the upstream side of the third pipeline 93, the second pipeline 92 is provided with a first control valve 81, and the third pipeline 93 is provided with a second control valve 82. Thus, the on-off control of the heating circuit can be realized by the first control valve 81, and the on-off control of the water adding circuit can be realized by the second control valve 82, so as to better ensure the heating of the heating water tank 31 through a group of water pumps, and the connection between the heating water tank 31 and the insulation water tank 32.

[0105] Among them, the fourth pipeline 94 and the fifth pipeline 95 are connected to form a pipeline between the second common water pump group 12 and the water use side 70, so that the water in the insulated water tank 32 is transported to the water use side 70 through the second common water pump group 12 to ensure normal water use of the water use side 70.

[0106] Among them, the fourth pipeline 94 and the sixth pipeline 96 are connected to form a pipeline between the second common water pump group 12 and the water inlet end of the insulation unit 22, and the seventh pipeline 97 forms a pipeline between the water outlet end of the insulation unit 22 and the insulation water tank 32, and the third control valve 83 is provided on the seventh pipeline 97. The third control valve 83 can control the on-off of the insulation circuit composed of the insulation water tank 32, the second common water pump group 12, the insulation unit 22, etc.

[0107] Among them, the third pipeline 93 and the seventh pipeline 97 share a part of the pipeline 100, the pipeline other than the shared part of the pipeline 100 of the third pipeline 93 is provided with a second control valve 82, the pipeline other than the shared part of the pipeline 100 of the seventh pipeline 97 is provided with a third control valve 83, the first end of the eighth pipeline 98 is connected to the fifth pipeline 95, and the second end of the eighth pipeline 98 is connected to the insulation water tank 32 through the third control valve 83. In this way, the third control valve 83 can realize the conduction of the water adding circuit, and can also realize the circulation of the water in the insulation water tank 32 among the fourth pipeline 94, the fifth pipeline 95, the eighth pipeline 98 and the insulation water tank 32. At the same time, since the fourth pipeline 94 and the fifth pipeline 95 constitute a pipeline between the second common water pump group 12 and the water-using side 70, the water in the insulated water tank 32 can be supplied to the water-using side 70 while circulating between the fourth pipeline 94, the fifth pipeline 95, the eighth pipeline 98 and the insulated water tank 32, thereby better ensuring a stable supply of hot water.

[0108] The constant temperature hot water system may include a ninth pipeline 99, and the ninth pipeline 99 may be provided with a fourth control valve 84. The ninth pipeline 99 may be used to add water to the heating water tank 31, and it may provide hot water to the heating water tank 31, or it may provide cold water to the heating water tank 31, and then heat it through the heating circuit, which is not limited. In this embodiment, the water volume of the heating water tank 31 may be monitored in real time through a water level switch (referred to as the first water level switch 51). When the water volume of the heating water tank 31 is less than the heating water volume threshold, the fourth control valve 84 may be opened to control the ninth pipeline 99 to be connected, thereby adding water to the heating water tank 31.

[0109] It should be noted that the heating water volume threshold refers to the water volume threshold in the heating water tank 31, which can be set according to actual needs and its specific value is not limited.

[0110] Among them, when the water volume of the heating water tank 31 is greater than or equal to the heating water volume threshold, and the water temperature of the heating water tank 31 is less than the heating temperature threshold, the fourth control valve 84 and the second control valve 82 can be closed, and the first control valve 81 can be opened to control the ninth pipeline 99 and the water supply circuit to be closed, and to control the heating circuit to be turned on. At the same time, the first common water pump group 11 and the heating unit 21 can be controlled to be turned on. In this way, the water in the heating water tank 31 can be prevented from flowing into the insulation water tank 32, and the water in the heating water tank 31 can be heated by the first common water pump group 11 and the heating unit 21 to increase the water temperature of the heating water tank 31.

[0111] It should be noted that, in the process of heating the water in the heating water tank 31, the insulation circuit of the insulation water tank 32 can be turned on or off, and this is not limited. If the water volume of the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 is less than the insulation temperature threshold and the set temperature difference, the second control valve 82 can be opened to control the insulation circuit to be turned on. The second common water pump group 12 and the insulation unit 22 can be controlled to be turned on to increase the water temperature of the insulation water tank 32 until the insulation temperature threshold is reached. If the insulation water tank 32 does not meet the above conditions, that is, the water volume of the insulation water tank 32 is less than the insulation water volume threshold, and / or the water temperature of the insulation water tank 32 is greater than or equal to the insulation temperature threshold and the set temperature difference, the second control valve 82 can be closed to control the insulation circuit to be turned off. The second common water pump group 12 and the insulation unit 22 can be controlled to be turned off to save energy consumption.

[0112] Among them, when the water temperature of the heating water tank 31 is greater than or equal to the heating temperature threshold, and the water volume of the heating water tank 31 is greater than or equal to the heating water volume threshold, and the water volume of the insulation water tank 32 is less than the insulation water volume threshold, it means that the water temperature and water volume of the heating water tank 31 are sufficient, and the water volume of the insulation water tank 32 is small. At this time, the second control valve 82 can be opened and the first control valve 81 can be closed to control the water supply circuit to be turned on and the heating circuit to be turned off. At the same time, the first common water pump group 11 can be controlled to open, so as to transport the hot water in the heating water tank 31 to the insulation water tank 32. In addition, the heating unit 21 can be controlled to be turned off to reduce energy consumption.

[0113] Among them, when the amount of water in the insulation water tank 32 is greater than or equal to the insulation water amount threshold, and the water temperature of the insulation water tank 32 is less than the difference between the insulation temperature threshold and the set temperature, it means that the amount of water in the insulation water tank 32 is sufficient, but the water temperature is low. At this time, the third control valve 83 can be opened to control the conduction of the insulation circuit. And the second control valve 82 can be closed to control the water supply circuit to be shut off. At the same time, the second common water pump group 12 and the insulation unit 22 can be controlled to open to increase the water temperature of the insulation water tank 32 until the insulation temperature threshold is reached. In addition, since the second control valve 82 is in a closed state during this process, it can better ensure that the water in the insulation water tank 32 is heated and circulated through the insulation circuit.

[0114] It should be noted that when the heat preservation circuit is in the on state, the temperature increase circuit of the heating water tank 31 can be either on or off, and there is no limitation on this.

[0115] Among them, when the water volume of the insulated water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulated water tank 32 reaches the insulation temperature threshold, it means that the water volume and water temperature of the insulated water tank 32 meet the requirements. At this time, the third control valve 83 can be closed to shut off the insulation circuit, and the second control valve 82 can be opened and the first control valve 81 can be closed. Thus, the water in the insulated water tank 32 can be opened to circulate between the insulated water tank 32, the fourth pipeline 94, the fifth pipeline 95, the eighth pipeline 98 and the common part pipeline 100, so as to better ensure the stable water supply to the water use side 70.

[0116] It should be noted that when the insulation circuit is in the off state, if the water volume of the insulation water tank 32 is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank 32 is greater than or equal to the difference between the insulation temperature threshold and the set temperature, the second control valve 82 can be opened and the first control valve 81 can be closed, thereby opening the circulation of the water in the insulation water tank 32 between the insulation water tank 32, the fourth pipeline 94, the fifth pipeline 95, the eighth pipeline 98 and the common part pipeline 100, so as to better ensure the stable water supply to the water side 70. When the insulation circuit is in the on state, after detecting that the water temperature of the insulation water tank 32 reaches the insulation temperature threshold, the third control valve 83 can be closed to shut down the insulation circuit; and the second control valve 82 is opened, and the first control valve 81 is controlled to be in the closed state, so as to better ensure the stable water supply to the water side 70.

[0117] It should be noted that the control valves such as the first control valve 81, the second control valve, the third control valve 83 and the fourth control valve 84 in this embodiment may be electric valves or other control valves, and this is not limited.

[0118] The fifth pipeline 95 of this embodiment can be provided with a pressure sensor 60 and a temperature sensor (referred to as the third temperature sensor 43) to monitor the water pressure and water temperature of the water-using side 70 to better improve the user experience. The eighth pipeline 98 can be provided with a temperature sensor (referred to as the fourth temperature sensor 44). Through the temperature sensors of the fifth pipeline 95 and the eighth pipeline 98, the water temperature of the water-using side 70 can be better determined to further improve the user experience.

[0119] In the constant temperature hot water system of this embodiment, the heating water tank 31 and the heat preservation water tank 32 can share a set of water pumps (i.e., the first shared water pump set 11) to achieve the connection between the two water tanks and the heating water tank 31. In addition, the heat preservation unit 22 and the terminal system on the water side 70 are designed to share a set of water pumps (i.e., the second shared water pump set 12) to achieve circulation in different modes.

[0120] Compared with the related art, this embodiment reduces the water pump group and the corresponding connecting pipes between the two water tanks (i.e., the heating water tank 31 and the insulation water tank 32), and reduces the separate water pump configuration of the insulation water tank 32 on the insulation unit 22 and the water side 70, thereby reducing the initial investment in the water pump and its corresponding pipes, simplifying the system, reducing the failure rate of the system, and facilitating construction and installation.

[0121] In this embodiment, when it is detected that the water in the heating water tank 31 is lower than the set minimum value Q1 (i.e., the threshold value of the heating water tank 31), the fourth control valve 84 can be automatically opened to start the water replenishment operation of the heating water tank 31, and replenish the set water volume Q2 of the water tank at one time. Then the first control valve 81 is opened, and the heating unit 21 and the first common water pump unit 11 are controlled to be turned on. Then the system starts to detect the water temperature of the heating water tank. If the water temperature reaches the set value T1 (i.e., the heating temperature threshold), the heating unit 21 on the side of the heating water tank 31 is stopped, and the first control valve 81 is closed. If the water temperature in the heating water tank 31 does not reach the set value T1, the system continues to operate in this mode until the water temperature of the heating water tank 31 reaches the set value T1. During this process, because the amount of water is large, the heating unit 21 can operate according to the set temperature difference (that is, the set temperature rise gradient, for example, 5°C). Therefore, in the early stage of heating, the evaporation temperature of the heating unit 21 is relatively low, and the pressure of the compressor of the heating unit 21 is relatively small. Therefore, the energy efficiency of the heating unit 21 in the early stage of heating is relatively high. Compared with the conventional circulating heating system with 60°C water outlet and 55°C return water, the one-time step heating system is more energy-efficient.

[0122] In this embodiment, after the temperature in the heating water tank 31 reaches the set value T1, the system first detects whether the amount of water in the insulation water tank 32 is lower than the minimum set value Q3 (i.e., the insulation water threshold value). If it is higher than the minimum set value Q3, it means that the insulation water tank 32 does not need to be supplemented with hot water, and the system ensures the status quo. If it is detected that the amount of water in the insulation water tank 32 is lower than the minimum set value Q3, the system opens the second control valve 82 and closes the first control valve 81, and the hot water in the heating water tank 31 is supplemented to the insulation water tank 32 through the first common water pump group 11 water pump. It should be noted that the difference between the minimum set value Q3 and the maximum water set value Q4 of the water volume of the insulation water tank 32 should be consistent with the maximum water volume that the heating water tank 31 can provide.

[0123] In this embodiment, the temperature sensor can be used to detect whether the water temperature in the insulated water tank 32 reaches the set temperature T2 (i.e., the insulation temperature threshold). If it is detected that the set temperature T2 is met, the insulated water tank 32 does not need to be insulated by the insulation unit 22. If it is detected that the water temperature in the insulated water tank 32 is lower than the difference between the set temperature T2 and the set allowable temperature difference Tb, the second control valve 82 can be closed, and the third control valve 83 can be opened synchronously, and the second water pump group and the insulation unit 22 can be controlled to be opened, so as to keep the insulated water tank 32 in an insulated operation until the water temperature of the insulated water tank 32 reaches the set temperature T2.

[0124] In addition, in this embodiment, when the user is in use, the second control valve 82 can be opened, and the second common water pump group 12 can be controlled to circulate all the time, ensuring that the user always has a stable constant temperature hot water supply when in use.

[0125] This embodiment can achieve heating of the heating water tank 31 and communication between the heating water tank 31 and the insulation water tank 32 through the first common water pump group 11 and the second common water pump group 12 and their related pipelines, and can also achieve insulation circulation of the insulation water tank 32 and circulating water on the water side 70, which solves the problem of unstable heating temperature caused by the hot water system with a single water tank in the related art, improves user comfort, and reduces the use of water pump groups in the hot water system with two water tanks in the related art, simplifies system design, and can reduce initial investment and failure rate. The constant temperature hot water system of this embodiment uses fewer water pump groups to achieve a simpler and more stable hot water system, improving the user experience.

[0126] The professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0127] It should be noted that the phrases "one implementation", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0128] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more limiting values, the elements defined by the sentence "comprise a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0129] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. A constant temperature hot water system, It is characterized in that The constant temperature hot water system comprises a hot water tank, a heat preservation water tank, a first common water pump unit and a heating unit; Among them, the heating water tank, the first common water pump group and the heating unit are connected in sequence to form a heating circuit of the heating water tank; the heating water tank, the first common water pump group, the heating unit and the insulation water tank are connected in sequence to form a water adding circuit of the insulation water tank.

2. According to the constant temperature hot water system of claim 1, It is characterized in that The constant temperature hot water system includes a first pipeline, a second pipeline and a third pipeline. The first pipeline and the second pipeline constitute the pipeline between the heating unit and the heating water tank, and the first pipeline and the third pipeline constitute the pipeline between the heating unit and the thermal insulation water tank. The first pipeline is located on the upstream side of the second pipeline, and the first pipeline is located on the upstream side of the third pipeline. The second pipeline is provided with a first control valve, and the third pipeline is provided with a second control valve.

3. The constant temperature hot water system according to any one of claims 1 or 2, It is characterized in that The constant temperature hot water system includes a second common water pump group and an insulation unit. The insulation water tank is connected to the water use side through the second common water pump group, and the insulation water tank, the second common water pump group and the insulation unit are connected in sequence to form an insulation circuit of the insulation water tank.

4. According to the constant temperature hot water system of claim 3, It is characterized in that The constant temperature hot water system comprises a fourth pipeline, a fifth pipeline, a sixth pipeline and a seventh pipeline; The fourth pipeline is connected to the fifth pipeline, forming a pipeline between the second common water pump group and the water-using side; The fourth pipeline is connected to the sixth pipeline, forming a pipeline between the second common water pump group and the water inlet end of the insulation unit, and the seventh pipeline forms a pipeline between the water outlet end of the insulation unit and the insulation water tank, and a third control valve is arranged on the sixth pipeline and / or the seventh pipeline.

5. According to the constant temperature hot water system of claim 4, It is characterized in that The constant temperature hot water system comprises a first pipeline and a third pipeline, wherein the first pipeline and the third pipeline constitute a pipeline between the heating unit and the thermal insulation water tank, and the third pipeline shares part of the pipeline with the seventh pipeline; Wherein, when the third control valve is arranged in the seventh pipeline, the pipeline outside the common part of the third pipeline is provided with a second control valve, and the pipeline outside the common part of the seventh pipeline is provided with the third control valve.

6. The constant temperature hot water system according to claim 4, It is characterized in that The constant temperature hot water system includes an eighth pipeline, a first end of the eighth pipeline is connected to the fifth pipeline, and a second end of the eighth pipeline is connected to the thermal insulation water tank through the second control valve.

7. A control method, It is characterized in that The control method is applied to the constant temperature hot water system according to any one of claims 1 to 6, and the control method comprises: When the water temperature of the heating water tank is lower than the heating temperature threshold, the water supply circuit of the heat preservation water tank is shut down, the temperature increase circuit of the heating water tank is turned on, and the first common water pump unit and the heating unit are turned on to increase the water temperature of the heating water tank; When the water temperature of the heating water tank is greater than or equal to the heating temperature threshold and the water volume of the insulation water tank is less than the insulation water volume threshold, the water adding circuit is controlled to be turned on, the heating circuit is turned off, the first shared water pump group is turned on, and the heating unit is turned off to increase the water volume of the insulation water tank.

8. The control method according to claim 7, It is characterized in that When the water temperature of the heating water tank is lower than the heating temperature threshold, the water adding circuit of the heat preservation water tank is controlled to be turned off, and the heating circuit of the heating water tank is controlled to be turned on to increase the water temperature of the heating water tank, the control method includes: The heating unit is controlled to operate with a set temperature rise gradient to gradually increase the water temperature of the heating water tank until the heating temperature threshold is reached.

9. The control method according to claim 7, It is characterized in that The constant temperature hot water system comprises a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline and the second pipeline constitute a pipeline between the heating unit and the heating water tank, and the first pipeline and the third pipeline constitute a pipeline between the heating unit and the thermal insulation water tank, and the first pipeline is located at the upstream side of the second pipeline, a first control valve is provided on the second pipeline, and a second control valve is provided on the third pipeline; the control method comprises: When the water temperature of the heating water tank is lower than the heating temperature threshold, the first control valve is opened and the second control valve is closed to control the water adding circuit to be closed and the heating circuit to be turned on; When the water temperature of the heating water tank is greater than or equal to the heating temperature threshold and the water volume of the insulation water tank is less than the insulation water volume threshold, the water adding circuit is controlled to be turned on and the heating circuit to be turned off by opening the second control valve and closing the first control valve.

10. The control method according to any one of claims 7 to 9, It is characterized in that The constant temperature hot water system includes a second common water pump group and a heat preservation unit, the heat preservation water tank is connected to the water use side through the second common water pump group, and the heat preservation water tank, the second common water pump group and the heat preservation unit are connected in sequence to form a heat preservation circuit of the heat preservation water tank, and the control method includes: When the water volume in the insulation water tank is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank is less than the difference between the insulation temperature threshold and the set temperature, the insulation circuit is controlled to be turned on, the second shared water pump group and the insulation unit are turned on, and the water adding circuit is turned off to increase the water temperature of the insulation water tank until the insulation temperature threshold is reached.

11. The control method according to claim 10, It is characterized in that The constant temperature hot water system includes a fourth pipeline, a fifth pipeline, a sixth pipeline and a seventh pipeline; the fourth pipeline is connected to the fifth pipeline, forming a pipeline between the second common water pump group and the water use side; the fourth pipeline is connected to the sixth pipeline, forming a pipeline between the second common water pump group and the water inlet end of the insulation unit, the seventh pipeline forms a pipeline between the water outlet end of the insulation unit and the insulation water tank, and a third control valve is provided on the sixth pipeline and / or the seventh pipeline; the control method includes: When the water volume in the insulation water tank is greater than or equal to the insulation water volume threshold, and the water temperature of the insulation water tank is less than the difference between the insulation temperature threshold and the set temperature, the insulation circuit is controlled to be conductive by opening the third control valve.

12. The control method according to claim 11, It is characterized in that The constant temperature hot water system comprises a first pipeline and a third pipeline, wherein the first pipeline and the third pipeline constitute a pipeline between the heating unit and the thermal insulation water tank, and the third pipeline and the seventh pipeline share a portion of the pipeline; when the third control valve is arranged on the seventh pipeline, a second control valve is arranged on the pipeline other than the shared portion of the third pipeline, and the third control valve is arranged on the pipeline other than the shared portion of the seventh pipeline; the control method comprises: When the water volume in the insulated water tank is greater than or equal to the insulation water volume threshold, and the water temperature of the insulated water tank is less than the difference between the insulation temperature threshold and the set temperature, the water addition circuit is shut off and the insulation circuit is turned on by closing the second control valve and opening the third control valve.

13. The control method according to claim 12, It is characterized in that The constant temperature hot water system includes an eighth pipeline, a first end of the eighth pipeline is connected to the fifth pipeline, and a second end of the eighth pipeline is connected to the thermal insulation water tank through the third control valve; the control method includes: When the water volume in the insulated water tank is greater than or equal to the insulated water volume threshold and the water temperature in the insulated water tank reaches the insulated temperature threshold, the third control valve is closed and the second control valve is opened to provide water source for the water-using side.

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