A heat pump water heater water system

Abstract

The present invention discloses a heat pump water heater water circuit system, including a heat pump water heater, and at least one pipeline energy storage thermostat; each pipeline energy storage thermostat includes a controller, an energy storage heating module and a thermostatic water mixing valve; the water inlet of the energy storage heating module is connected to the water outlet of the heat pump water heater, the water outlet of the energy storage heating module is connected to the first water inlet of the thermostatic water mixing valve; the water outlet of the heat pump water heater is connected to the second water inlet of the thermostatic water mixing valve; the water outlet of the thermostatic water mixing valve is connected to the first hot water use end. The heat pump water heater water circuit system provided by the embodiment of the present invention, by arranging the pipeline energy storage thermostat between the water outlet and the use end of the heat pump water heater, enables the cold water in the pipeline to be heated, kept warm and mixed in the coordinated action of the controller, the energy storage heating module and the thermostatic water mixing valve in the pipeline energy storage thermostat, and the hot water use end can discharge the hot water in time, shortening the time for users to wait for hot water.

Description

Technical Field

[0001] The invention relates to the technical field of water heaters, and in particular to a water circuit system of a heat pump water heater. Background Art

[0002] A water heater is a device that raises the temperature of cold water to hot water within a certain period of time. It is connected to multiple user ends through a water supply pipeline and heats and supplies hot water when users need it. Due to the different locations of each user end, the pipeline from the water outlet of the water heater to the user end is long. When using hot water, users need to drain the cold water in the pipeline before they can get hot water, resulting in a long waiting time, making it difficult to get hot water in time, and causing a waste of water resources. Summary of the invention

[0003] The present invention provides a heat pump water heater water circuit system to solve the technical problem that the existing water supply end cannot discharge hot water in time. By heating the cold water in the pipeline between the water outlet of the water heater and the user end, the time for users to wait for hot water can be shortened.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a heat pump water heater water system, including a heat pump water heater, and at least one pipeline energy storage constant temperature device;

[0005] Each of the pipeline energy storage constant temperature devices comprises a controller, an energy storage heating module and a constant temperature water mixing valve, and the controller is connected to the energy storage heating module and the constant temperature water mixing valve respectively;

[0006] The water inlet end of the energy storage heating module is connected to the water outlet end of the heat pump water heater, and the water outlet end of the energy storage heating module is connected to the first water inlet end of the constant temperature mixing water valve; the water outlet end of the heat pump water heater is connected to the second water inlet end of the constant temperature mixing water valve; the water outlet end of the constant temperature mixing water valve is connected to the first hot water usage end.

[0007] As a preferred solution, the energy storage heating module includes an electric water heater and a thermal insulation water tank;

[0008] The water inlet of the electric water heater is connected to the water outlet of the heat pump water heater; the water outlet of the insulated water tank is connected to the first water inlet of the constant temperature mixing valve.

[0009] As a preferred solution, the method for calculating the volume of the electric water heater is:

[0010] Obtaining the volume of cold water in the water path to be heated, and calculating a first heating temperature difference according to the cold water temperature and the target water temperature of the first hot water user end;

[0011] Substituting the cold water volume and the first heating temperature difference into a preset heating equivalent calculation formula to calculate the heating equivalent of the electric water heater;

[0012] The volume of the electric water heater is obtained according to the heating equivalent, the heating parameter of the electric water heater and the insulation parameter of the insulation water tank.

[0013] As a preferred solution, the step of obtaining the cold water volume in the water path to be heated is specifically as follows:

[0014] The cold water volume is calculated based on the length and diameter of the water circuit to be heated.

[0015] As a preferred solution, the heating equivalent calculation formula includes:

[0016] δ

[0017] Where Q is the heating equivalent of the electric water heater, C is the cold water volume, T δ is the first heating temperature difference.

[0018] As a preferred solution, the step of obtaining the volume of the electric water heater according to the heating equivalent, the heating parameter of the electric water heater and the insulation parameter of the insulation water tank is specifically as follows:

[0019] Respectively obtaining the maximum safe heating temperature of the electric water heater and the heat loss ratio of the thermal insulation water tank, and calculating the second heating temperature difference according to the maximum safe heating temperature and the cold water temperature;

[0020] The volume of the electric water heater is determined according to the second heating temperature difference, the heat loss ratio of the thermal insulation water tank, and the heating equivalent.

[0021] As a preferred solution, the first water inlet end of the thermostatic mixing valve is provided with a first temperature sensor; the second water inlet end of the thermostatic mixing valve is provided with a second temperature sensor; the water outlet end of the thermostatic mixing valve is provided with a third temperature sensor;

[0022] The controller is connected to the first temperature sensor, the second temperature sensor, and the third temperature sensor respectively;

[0023] As a preferred solution, the thermostatic water mixing valve is a solenoid valve with adjustable flow.

[0024] As a preferred solution, the water system of the heat pump water heater further includes at least one cold water pipeline, and the water outlet end of each of the cold water pipelines is respectively connected to the corresponding cold water use end.

[0025] As a preferred solution, the water outlet of the heat pump water heater is also connected to the second hot water usage end.

[0026] Compared with the prior art, the beneficial effect of the embodiments of the present invention lies in that, by arranging a pipeline energy storage thermostat device between the water outlet and the use end of the heat pump water heater, the cold water in the pipeline is heated, insulated and mixed accordingly under the coordinated action of the controller, energy storage heating module and constant temperature mixing valve in the pipeline energy storage thermostat device. When the user needs to use hot water, since the pipeline energy storage thermostat device has carried out targeted treatment on the cold water in the pipeline, the use end will not discharge the cold water first like the prior art, but will directly discharge the hot water treated by the pipeline energy storage thermostat. The user does not need to wait, which greatly shortens the time the user waits for hot water. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a water circuit system of a heat pump water heater in one embodiment of the present invention;

[0028] Figure 2 is a flow chart of a method for calculating the volume of an electric water heater in one embodiment of the present invention;

[0029] Figure 3 It is a partial flow chart of a method for calculating the volume of an electric water heater in one embodiment of the present invention;

[0030] The reference numerals in the accompanying drawings of the specification are as follows:

[0031] 1. Heat pump water heater; 2. Pipeline energy storage constant temperature device; 21. Energy storage heating module; 22. Constant temperature mixing valve; A. First hot water use end; B. Second hot water use end; M. Hot water pipeline; N. Cold water pipeline. DETAILED DESCRIPTION

[0032] 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.

[0033] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0036] An embodiment of the present invention provides a water circuit system for a heat pump water heater. For details, see Figure 1 , Figure 1 A schematic structural diagram of a water system of a heat pump water heater provided in an embodiment of the present invention, comprising a heat pump water heater 1 and at least one pipeline energy storage thermostat 2.

[0037] It should be noted that there are many scenarios where heat pump water heaters are used to obtain hot water supply, such as apartments, shopping malls, office buildings, etc. The heat pump water heater 1 and the pipeline energy storage thermostat 2 in the embodiment of the present invention are both arranged on the hot water pipeline M that provides hot water. By setting up multiple hot water pipelines M and setting the pipeline energy storage thermostat 2 on the corresponding hot water pipelines M, it is possible to achieve multiple hot water pipelines M to supply different user ends, solving the problem of water pressure and water temperature fluctuations at the end of the pipeline. For example, in today's household water use, the water use ends of the kitchen, bathroom, shower room and other rooms all share a hot water supply pipeline, using a single-circulation water system, tap water enters the water heater and is heated to the temperature required by the user end before being supplied to each user end, and the hot water is circulated by the heat-insulating circulating water pump. The actions of each water user end will cause fluctuations in water volume and water temperature, resulting in a poor user experience. The present invention supplies water through the cold water pipeline and the hot water pipeline in parallel, directly supplies water to each user end respectively, and arranges a pipeline energy storage constant temperature device on the hot water pipeline with a longer pipeline to shorten the user's waiting time for hot water, which can solve the problems of water pressure and water temperature fluctuations at the end of the pipeline, and there is no need to use an insulated circulating water pump to strengthen the circulation of the hot water pipeline, thereby reducing heat loss caused by the thermal insulation circulation, and playing a role of high efficiency and energy saving.

[0038] In this embodiment, each of the pipeline energy storage constant temperature devices 2 includes a controller (not shown), an energy storage heating module 21 and a constant temperature mixing valve 22, and the controller is connected to the energy storage heating module 21 and the constant temperature mixing valve 22 respectively; the water inlet end of the energy storage heating module 21 is connected to the water outlet end of the heat pump water heater 1, and the water outlet end of the energy storage heating module 21 is connected to the first water inlet end of the constant temperature mixing valve 22; the water outlet end of the heat pump water heater 1 is connected to the second water inlet end of the constant temperature mixing valve 22; the water outlet end of the constant temperature mixing valve 22 is connected to the first hot water usage end A.

[0039] Since the pipeline from the water outlet of the heat pump water heater to some of the usage ends is long, in the prior art, the cold water in the pipeline needs to be discharged first, and the hot water heated by the heat pump water heater will be discharged at the usage end. The embodiment of the present invention heats and mixes the cold water in the pipeline by providing a pipeline energy storage constant temperature device which is coordinated by a controller, an energy storage heating module and a constant temperature mixing valve. After the user opens the water use end, hot water can flow out in time. When the hot water heated by the heat pump water heater reaches the usage end, the heat pump water heater continues to provide hot water. The user does not need to wait for the cold water to be discharged, which will not cause waste of water resources and improve the user experience.

[0040] As one of the preferred solutions, the energy storage heating module 21 includes an electric water heater and an insulated water tank. Of course, in addition to the electric water heater, other heat exchangers, electric heating wires and other devices can also be used to achieve the heating treatment of cold water in the pipeline. The choice of devices is determined by the actual requirements of the product and the cost factor. In this embodiment, the water inlet end of the electric water heater is connected to the water outlet end of the heat pump water heater, which is used to receive the hot water discharged from the water outlet end of the heat pump water heater; the water outlet end of the insulated water tank is connected to the first water inlet end of the constant temperature mixing valve, which is used to provide treated hot water to the constant temperature mixing valve. In addition, the volume of the insulated water tank needs to match the electric water heater, and the cost limit of the product and the actual needs of the user need to be comprehensively considered.

[0041] It should be noted that, in the present embodiment, the controller is also connected to the heat pump water heater for receiving relevant trigger signals. For example, when the controller detects that the heat pump water heater is not working, it controls the energy storage heating module to work and heats the water in the pipeline. Of course, the specific heating temperature needs to be designed in combination with actual parameters. Since the time range for users to use hot water cannot be determined, it is necessary to control the energy storage heating module to heat the water temperature to a higher temperature (higher than the temperature at the hot water usage end). In this way, it is ensured that the heated water does not lose too much heat in the insulated water tank, and cooperates with the insulated water tank to play the role of energy storage and heat preservation.

[0042] In addition, in the embodiment of the present invention, the volume of the electric water heater in the energy storage heating module has been set before leaving the factory. Therefore, in actual use, there is no need to set up relevant detection elements, or perform additional operations such as detecting the cold water volume, thereby saving product costs, simplifying the control process of the entire heat pump water heater water system, and being able to relatively reduce the installation space of the electric water heater.

[0043] Preferably, see Figure 2 , Figure 2 The flowchart of the method for calculating the volume of an electric water heater according to one embodiment is shown, which specifically includes:

[0044] S1. Obtain the volume of cold water in the water path to be heated, and calculate a first heating temperature difference according to the cold water temperature and the target water temperature of the first hot water user end;

[0045] S2, substituting the cold water volume and the first heating temperature difference into a preset heating equivalent calculation formula to calculate the heating equivalent of the electric water heater;

[0046] S3. Obtaining the volume of the electric water heater according to the heating equivalent, the heating parameter of the electric water heater and the insulation parameter of the insulation water tank.

[0047] First, the cold water volume in the water circuit is obtained according to the length of the pipeline between the heat pump water heater and the user end. As one of the preferred solutions, the volume can be calculated according to the length and diameter of the pipeline to be heated. Of course, it can also be directly obtained by referring to the corresponding water plant manufacturer standard; then the cold water temperature in the water circuit is obtained (based on the average value), and the first heating temperature difference is calculated according to the cold water temperature and the target water temperature of the first hot water user end; then the cold water volume and the first heating temperature difference are substituted into the preset heating equivalent calculation formula, and the specific calculation formula includes:

[0048] δ

[0049] Where Q is the heating equivalent of the electric water heater, C is the cold water volume, T δ is the first heating temperature difference.

[0050] After calculating the heating equivalent of the electric water heater, the volume of the electric water heater is obtained according to the heating equivalent, the heating parameter of the electric water heater and the insulation parameter of the insulation water tank. In this embodiment, as a preferred embodiment, see Figure 3 , Figure 3 A partial flow chart of a method for calculating the volume of an electric water heater according to one embodiment is shown, comprising:

[0051] S301, respectively obtaining the maximum safe heating temperature of the electric water heater and the heat loss ratio of the thermal insulation water tank, and calculating a second heating temperature difference according to the maximum safe heating temperature and the cold water temperature;

[0052] S302. Determine the volume of the electric water heater according to the second heating temperature difference, the heat loss ratio of the thermal insulation water tank, and the heating equivalent.

[0053] In this embodiment, the heating parameters of the electric water heater include the maximum safe heating temperature of the electric water heater, and the insulation parameters of the insulated water tank include the heat loss ratio of the insulated water tank. By respectively obtaining the maximum safe heating temperature of the electric water heater and the heat loss ratio of the insulated water tank, and calculating the second heating temperature difference according to the maximum safe heating temperature and the cold water temperature, multi-faceted data support is provided for the volume calculation of the electric water heater, so that the calculated volume of the electric water heater meets the requirements of multiple factors such as volume, water temperature, heat loss and cost. The most suitable volume of the electric water heater is obtained by pre-calculating, so that the electric water heater occupies a small space in the water system of the heat pump water heater, the structure is more compact, and the heating heat is more fully utilized, achieving a high efficiency and energy-saving effect.

[0054] For example, the cold water volume in the pipeline is 6L, the cold water temperature is 15℃, and the target hot water temperature at the user end is required to be ≥45℃. Therefore, the heating equivalent of the cold water in the pipeline is Q1=(45-15)*6=180J; let the volume of the electric water heater be A, and the initial water temperature be 55℃, that is, the heat storage equivalent of the electric water heater needs to be greater than or equal to the above heating equivalent, that is, Q2 =(55-15)*A*70%≥Q1=180. It can be calculated that when A≥6.43L, the heat requirement is met. According to the specifications of electric water heaters on the market and the corresponding selection specifications of the thermal insulation water tank, the electric water heater with a minimum A=6.6L can meet the heating needs.

[0055] In the embodiment of the present invention, the controller is used to achieve basic control over the energy storage heating module 21 and the thermostatic water mixing valve 22; the thermostatic water mixing valve 22 is used to mix the hot water discharged after the energy storage heating module 21 is heated with the cold water in the pipeline, thereby reducing the bad experience of cold water discharge and water waste when the user uses it, and finally achieves the mixing of the cold water in the pipeline to obtain stable water output at the temperature required by the user. The thermostatic water valve is used to ensure the temperature of the water used at the user end. Its type can be an intelligent control water valve that cooperates with the controller, a solenoid valve with adjustable flow, or a regulating water valve that can achieve basic functions, which is determined by the actual requirements of the product and cost factors.

[0056] As one of the preferred solutions, the first water inlet end of the thermostatic mixing valve is provided with a first temperature sensor; the second water inlet end of the thermostatic mixing valve is provided with a second temperature sensor; the water outlet end of the thermostatic mixing valve is provided with a third temperature sensor; the controller is connected to the first temperature sensor, the second temperature sensor, and the third temperature sensor respectively. The introduction of temperature sensors can improve the accuracy of control. By collecting the water temperature at each position in the water path in real time, the controller can perform more accurate water temperature calculations, ensuring that the user's hot water use end can discharge hot water of the expected target temperature.

[0057] As one of the preferred solutions, the heat pump water heater water system also includes at least one cold water pipeline N, and the water outlet end of each cold water pipeline N is respectively connected to the corresponding cold water use end (for the convenience of display, the cold water use end is not shown in the figure, and it is arranged at the same place as the hot water use end), so that cold water is directly supplied when the user needs to use it.

[0058] Preferably, the water outlet of the heat pump water heater 1 is also connected to the second hot water use end B. In this embodiment, Figure 1 As shown, the second hot water user end B is closer to the heat pump water heater 1 and has a shorter pipeline, so the above pipeline energy storage thermostat 2 is not needed, and the water outlet of the heat pump water heater 1 is directly connected to the second hot water user end B. The first hot water user end A is far from the heat pump water heater 1 and has a longer pipeline, so the above pipeline energy storage thermostat 2 needs to be used for corresponding processing (in the figure, the number of the first hot water user ends A is preferably two, and the number of the second hot water user end B is preferably one).

[0059] The heat pump water heater water system provided by the embodiment of the present invention arranges a pipeline energy storage thermostat between the water outlet and the use end of the heat pump water heater, so that the cold water in the pipeline is heated, kept warm and mixed accordingly under the coordinated action of the controller, energy storage heating module and constant temperature water mixing valve in the pipeline energy storage thermostat. When the user needs to use hot water, since the pipeline energy storage thermostat has carried out targeted treatment on the cold water in the pipeline, the use end will not discharge the cold water first as in the prior art, but will directly discharge the hot water treated by the pipeline energy storage thermostat. The user does not need to wait, which greatly shortens the time the user waits for hot water.

[0060] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A heat pump water heater water system, characterized in that: It includes a heat pump water heater and at least one pipeline energy storage thermostat; Each of the pipeline energy storage constant temperature devices comprises a controller, an energy storage heating module and a constant temperature water mixing valve, and the controller is connected to the energy storage heating module and the constant temperature water mixing valve respectively; The water inlet of the energy storage heating module is connected to the water outlet of the heat pump water heater, and the water outlet of the energy storage heating module is connected to the first water inlet of the constant temperature mixing valve; the water outlet of the heat pump water heater is connected to the second water inlet of the constant temperature mixing valve; the water outlet of the constant temperature mixing valve is connected to the first hot water use end; The energy storage heating module includes an electric water heater and a thermal insulation water tank; The water inlet of the electric water heater is connected to the water outlet of the heat pump water heater; the water outlet of the thermal insulation water tank is connected to the first water inlet of the thermostatic mixing valve; The calculation method of the volume of the electric water heater is: Obtaining the volume of cold water in the water path to be heated, and calculating a first heating temperature difference according to the cold water temperature and the target water temperature of the first hot water user end; Substituting the cold water volume and the first heating temperature difference into a preset heating equivalent calculation formula to calculate the heating equivalent of the electric water heater; Obtaining the volume of the electric water heater according to the heating equivalent, the heating parameter of the electric water heater and the insulation parameter of the insulation water tank; The step of obtaining the volume of the electric water heater according to the heating equivalent, the heating parameter of the electric water heater and the insulation parameter of the insulation water tank is specifically: Respectively obtaining the maximum safe heating temperature of the electric water heater and the heat loss ratio of the thermal insulation water tank, and calculating the second heating temperature difference according to the maximum safe heating temperature and the cold water temperature; The volume of the electric water heater is determined according to the second heating temperature difference, the heat loss ratio of the thermal insulation water tank, and the heating equivalent.

2. The heat pump water heater water circuit system according to claim 1, characterized in that: The step of obtaining the cold water volume in the water path to be heated is specifically as follows: The cold water volume is calculated based on the length and diameter of the water circuit to be heated.

3. The heat pump water heater water circuit system according to claim 1, characterized in that: The heating equivalent calculation formula includes: δ Where Q is the heating equivalent of the electric water heater, C is the cold water volume, T δ is the first heating temperature difference.

4. The heat pump water heater water circuit system according to claim 1, characterized in that: The first water inlet end of the thermostatic mixing valve is provided with a first temperature sensor; the second water inlet end of the thermostatic mixing valve is provided with a second temperature sensor; the water outlet end of the thermostatic mixing valve is provided with a third temperature sensor; The controller is connected to the first temperature sensor, the second temperature sensor, and the third temperature sensor respectively.

5. The heat pump water heater water circuit system according to claim 1, characterized in that: The constant temperature water mixing valve is a solenoid valve with adjustable flow.

6. The heat pump water heater water circuit system according to claim 1, characterized in that: The heat pump water heater water system also includes at least one cold water pipeline, and the water outlet end of each cold water pipeline is connected to the corresponding cold water use end.

7. The heat pump water heater water circuit system according to claim 1, characterized in that: The water outlet of the heat pump water heater is also connected to the second hot water use end.

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