CN214469322U - Hot water device and preheating circulation system thereof - Google Patents

Abstract

The embodiment of the application provides a hot water system and preheating circulation system that integrated has soft water function, wherein, a hot water system includes: the water heater comprises a water inlet pipeline for inputting water, a heat exchanger for heating water, a soft water waterway and a bypass waterway which are connected in parallel between the heat exchanger and the water inlet pipeline, a preheating circulating pump positioned at the upstream or downstream of the soft water waterway and the bypass waterway, and a water outlet pipeline communicated with the heat exchanger and used for outputting water; the soft water waterway and the bypass waterway can be respectively and independently conducted or blocked; the soft water waterway is provided with a softening module for softening water.

Description

Hot water device and preheating circulation system thereof

Technical Field

The application relates to the field of hot water devices, in particular to a hot water device and a control method and a preheating circulation system thereof.

Background

At present, along with the improvement of living standard of people, the requirement of people on daily water is more strict, water quality is irregular all over the country due to factors such as regions, water quality resource difference is larger, water quality in most regions is hard, and the skin of people is dry, rough and quick in aging when the water with high hardness is used for a long time, so that the demand of people on soft water is continuously increased, the soft water does not contain or contains less soluble calcium and magnesium compounds, the soft water can effectively inhibit fungi, delay skin aging and prevent the heated water from scaling, and the soft water is beneficial to life.

The existing water softener and the existing water heating device on the market are independent products, and all the water softeners and the water heating devices need to be installed independently in the installation process, so that the water softener not only occupies a large space and is high in purchase cost, but also is difficult to use and install, and the problem of hot water demand can be solved and the hardness of water can be reduced.

In addition, when the hot water device is applied to a zero cold water system (also called a preheating circulation system), a circulation water path in which the hot water device is located is easy to be contaminated and scaled after long-term operation, and needs to be maintained regularly, which has certain influence on the use experience of users.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings, it is an object of the present application to provide a hot water apparatus integrated with soft water function, a control method thereof, and a preheating circulation system, so as to solve at least one of the above problems.

In order to achieve the purpose, the technical scheme is as follows:

a preheating circulation control method of a hot water device, the hot water device comprises a soft water waterway and a bypass waterway which are connected in parallel and can be respectively and independently conducted or blocked, a preheating circulation pump which is positioned at the upstream or downstream of the soft water waterway and the bypass waterway, and a heat exchanger which is positioned at the downstream of the soft water waterway and the bypass waterway; the soft water waterway is provided with a softening module for softening water; wherein, the preheating circulation control method comprises the following steps:

starting the preheating circulating pump, and conducting the bypass waterway to perform preheating circulation;

and when the inlet water temperature of the hot water device is increased to be higher than a first preset temperature, the soft water waterway is conducted to carry out preheating circulation.

As a preferred embodiment, the inlet water temperature of the hot water unit is obtained by a first temperature sensor located on the inlet water main upstream of the soft water circuit and the bypass circuit.

In a preferred embodiment, the preheating circulation pump is turned off when the temperature of the inlet water to the heat exchanger increases to the target preheating circulation temperature.

In a preferred embodiment, the preheating circulation pump is turned off when the soft water path is turned on for a first predetermined time.

As a preferred embodiment, the inlet water temperature of the heat exchanger is obtained by a second temperature sensor located upstream of the heat exchanger and downstream of the soft water circuit and the bypass circuit.

In a preferred embodiment, the bypass water path is conducted to perform the preheating cycle when the soft water path is blocked.

In a preferred embodiment, when the inlet water temperature of the hot water apparatus increases to a first predetermined temperature or higher, the soft water path is conducted and the bypass path is blocked to perform the preheating cycle.

In a preferred embodiment, when the temperature of the inlet water of the hot water apparatus increases to a first predetermined temperature or higher, the preheating cycle is performed by blocking the bypass water path after the soft water path is turned on.

As a preferred embodiment, the warm-up cycle control method includes: and in the preheating circulation process of the bypass waterway in a conducting state, blocking the bypass waterway and conducting the soft water waterway when the flow change value of the water inlet flow or the water outlet flow of the heat exchanger is greater than a first preset value and the time is greater than a second preset time.

As a preferred embodiment, the warm-up cycle control method includes: and in the process of a preheating cycle performed before the inlet water temperature is increased to a first preset temperature, when the flow change value of the inlet water flow or the outlet water flow of the heat exchanger is greater than a first preset value and the time is greater than a second preset time, blocking the bypass water path and conducting the soft water path.

As a preferred embodiment, in the step of blocking the bypass water path and conducting the soft water path, the preheating circulation pump is stopped before conducting the soft water path, and the preheating circulation pump is restarted when the inflow or outflow of the water to the heat exchanger is reduced below a predetermined flow value or a flow change value of the inflow or outflow is greater than a second predetermined value.

As a preferred embodiment, the warm-up cycle control method includes: and in the preheating circulation process of the soft water waterway in a conducting state, when the water inlet temperature is reduced to be lower than a second preset temperature and the flow change value of the water inlet flow or the water outlet flow of the heat exchanger is smaller than a third preset value, the soft water waterway is blocked and the bypass waterway is conducted.

As a preferred embodiment, the warm-up cycle control method includes: and blocking the soft water path and conducting the bypass path when the inlet water temperature drops below a second predetermined temperature and a flow rate variation value of the inlet water flow rate or the outlet water flow rate of the heat exchanger is less than a third predetermined value during a preheating cycle performed after the inlet water temperature increases to a first predetermined temperature.

In a preferred embodiment, the second predetermined temperature is lower than the first predetermined temperature.

As a preferred embodiment, in the step of blocking the soft water path and conducting the bypass path, the preheating circulation pump is continuously operated.

In a preferred embodiment, the inlet water flow of the heat exchanger is obtained by a flow sensor located on the main line upstream of the heat exchanger.

As a preferred embodiment, the soft water waterway is provided with a first on-off solenoid valve for conducting or blocking the soft water waterway; the bypass waterway is provided with a second on-off solenoid valve for conducting or blocking the bypass waterway; wherein the first on-off solenoid valve is located upstream of the softening module on the soft water waterway; accordingly, the method can be used for solving the problems that,

in the step of conducting the bypass waterway to perform preheating circulation, closing the first on-off electromagnetic valve, opening the second on-off electromagnetic valve, and starting the preheating circulation pump;

and in the step of conducting the soft water waterway for preheating circulation, opening the first on-off electromagnetic valve, closing the second on-off electromagnetic valve and continuously operating the preheating circulation pump.

As a preferred embodiment, in the step of conducting the bypass water path for the preheating cycle, conducting the bypass water path and blocking the soft water path for the preheating cycle;

and in the step of conducting the soft water waterway for preheating circulation, conducting the bypass waterway and the soft water waterway for preheating circulation.

A preheating circulation control method of a hot water device, the hot water device comprises a soft water waterway and a bypass waterway which are connected in parallel and can be respectively and independently conducted or blocked, a preheating circulation pump which is positioned at the upstream or downstream of the soft water waterway and the bypass waterway, and a heat exchanger which is positioned at the downstream of the soft water waterway and the bypass waterway; the soft water waterway is provided with a softening module for softening water; wherein, the preheating circulation control method comprises the following steps:

conducting the bypass waterway and the soft water waterway to perform preheating circulation;

and when the inlet water temperature of the hot water device is increased to be higher than a first preset temperature, the soft water waterway is conducted and the bypass waterway is blocked to carry out preheating circulation.

A preheating circulation control method of a hot water device, the hot water device comprises a soft water waterway and a bypass waterway which are connected in parallel and can be respectively and independently conducted or blocked, a preheating circulation pump which is positioned at the upstream or downstream of the soft water waterway and the bypass waterway, and a heat exchanger which is positioned at the downstream of the soft water waterway and the bypass waterway; the soft water waterway is provided with a softening module for softening water; wherein, the preheating circulation control method comprises the following steps: and simultaneously conducting the bypass water path and the soft water path for preheating circulation.

In a preferred embodiment, when the bypass waterway and the soft water waterway are both in a conducting state, the flow rate of the bypass waterway is greater than the flow rate of the soft water waterway.

A preheating circulation control method of a hot water device, the hot water device comprises a soft water waterway and a bypass waterway which are connected in parallel and can be respectively and independently conducted or blocked, a preheating circulation pump which is positioned at the upstream or downstream of the soft water waterway and the bypass waterway, and a heat exchanger which is positioned at the downstream of the soft water waterway and the bypass waterway; the soft water waterway is provided with a softening module for softening water;

wherein, the preheating circulation control method comprises the following steps: and conducting the bypass waterway and blocking the soft water waterway to perform preheating circulation.

A control method of a water heating apparatus comprising a soft water circuit and a bypass circuit connected in parallel and each of which can be independently conducted or blocked, a preheating circulation pump located upstream or downstream of the soft water circuit and the bypass circuit, and a heat exchanger located downstream of the soft water circuit and the bypass circuit; the soft water waterway is provided with a softening module for softening water;

wherein the control method comprises the following steps: and when the preheating circulating pump is in a stop state and the water inlet flow or the water outlet flow of the heat exchanger is increased to be higher than a preset flow, conducting the soft water waterway after conducting the bypass waterway for a preset time.

A control method of a water heating apparatus comprising a soft water circuit and a bypass circuit connected in parallel and each of which can be independently conducted or blocked, a preheating circulation pump located upstream or downstream of the soft water circuit and the bypass circuit, and a heat exchanger located downstream of the soft water circuit and the bypass circuit; the soft water waterway is provided with a softening module for softening water;

wherein the control method comprises the following steps: and under the condition that the preheating circulating pump is in a stop state, when the water inlet flow or the water outlet flow of the heat exchanger is more than the preset flow and the bypass water path is conducted for a preset time, conducting the soft water path.

A control method of a water heating apparatus comprising a soft water circuit and a bypass circuit connected in parallel and each of which can be independently conducted or blocked, a preheating circulation pump located upstream or downstream of the soft water circuit and the bypass circuit, and a heat exchanger located downstream of the soft water circuit and the bypass circuit; the soft water waterway is provided with a softening module for softening water;

wherein the control method comprises the following steps: and under the condition that the preheating circulating pump is in a stop state and the bypass water path is in a conduction state, the soft water path is conducted when the water inlet flow or the water outlet flow of the heat exchanger lasts for a preset time length above a preset flow.

As a preferred embodiment, the control method further includes: and when the preheating circulating pump is in a starting state, the bypass water path is in a conducting state.

As a preferred embodiment, the control method further includes: the warm-up cycle control method according to any one of the above embodiments.

A water heating apparatus comprising: the system comprises a soft water waterway, a bypass waterway, a preheating circulating pump and a heat exchanger, wherein the soft water waterway and the bypass waterway are connected in parallel and can be independently conducted or blocked, the preheating circulating pump is positioned at the upstream or downstream of the soft water waterway and the bypass waterway, and the heat exchanger is positioned at the downstream of the soft water waterway and the bypass waterway; the soft water waterway is provided with a softening module for softening water; the hot water device is used for executing the control method of any one of the above embodiments.

In a preferred embodiment, the water heater is a gas-fired water heater.

A preheat cycle system, comprising:

the hot water apparatus as described above;

a cold water pipeline communicated with the water inlet of the hot water device; the water inlet of the cold water pipeline or the hot water device is also communicated with a tap water pipeline;

the hot water pipeline is communicated with the water outlet of the hot water device;

the constant-pressure water return valve is communicated with the cold water pipeline and the hot water pipeline; and the constant-pressure water return valve is opened when the preheating circulating pump runs to communicate the hot water pipeline with the cold water pipeline.

A water heating apparatus comprising: the water heater comprises a water inlet pipeline for inputting water, a heat exchanger for heating water, a soft water waterway and a bypass waterway which are connected in parallel between the heat exchanger and the water inlet pipeline, a preheating circulating pump positioned at the upstream or downstream of the soft water waterway and the bypass waterway, and a water outlet pipeline communicated with the heat exchanger and used for outputting water; the soft water waterway and the bypass waterway can be respectively and independently conducted or blocked; the soft water waterway is provided with a softening module for softening water.

In a preferred embodiment, the preheating circulation pump is connected to the water inlet line.

In a preferred embodiment, a first temperature sensor is further disposed on the water inlet pipeline.

As a preferred embodiment, the method further comprises: a second temperature sensor located upstream of the heat exchanger and downstream of the soft water and bypass waterways.

In a preferred embodiment, the water heating device has a housing; the heat exchanger, soft water waterway, bypass waterway, the first valve body and the second valve body are located in the housing.

As a preferred embodiment, the method further comprises: a flow sensor located upstream or downstream of the soft water circuit and the bypass circuit.

In a preferred embodiment, the flow sensor is located downstream of the soft water circuit and the bypass circuit and upstream of the heat exchanger.

In a preferred embodiment, the soft water waterway is provided with a first valve body for conducting or blocking the soft water waterway; and the bypass waterway is provided with a second valve body for conducting or blocking the bypass waterway.

As a preferred embodiment, the first valve body is located upstream of the softening module.

As a preferred embodiment, the softening module comprises a resin tank; the connection port of the resin tank is located at the lower end of the resin tank.

A preheat cycle system, comprising:

the hot water apparatus as claimed in any one of the above embodiments;

a cold water pipeline communicated with the water inlet of the hot water device; the water inlet of the cold water pipeline or the hot water device is also communicated with a tap water pipeline;

the hot water pipeline is communicated with the water outlet of the hot water device;

the constant-pressure water return valve is communicated with the cold water pipeline and the hot water pipeline; and the constant-pressure water return valve is opened when the preheating circulating pump runs to communicate the hot water pipeline with the cold water pipeline.

Has the advantages that:

the hot water system of this embodiment is through being equipped with parallelly connected soft water route and bypass water route to, soft water route and bypass water route can be independently switched on or block separately, and then can realize exporting hot soft water (the soft water that is heated) or ordinary hot water through the break-make in control soft water route and bypass water route, satisfy user's different water demands, promote user and use experience.

The hot water system of this embodiment is through being equipped with the bypass water route, under the condition that the user need not hot soft water, can introduce the running water into heat exchanger through the bypass water route and heat and form hot water, and need not to change softening the module, and system stability is higher, satisfies user's different water experiences.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic diagram of a water circuit of a preheating circulation system according to an embodiment of the present disclosure;

FIG. 2 is a flow chart of a warm-up cycle control method of FIG. 1;

FIG. 3 is a flow chart of method steps for preheat cycle control in one embodiment of FIG. 1;

FIG. 4 is a flow chart of a control method in one embodiment of FIG. 1.

Description of reference numerals: 1. a soft water circuit; 2. a bypass waterway; 3. a heat exchanger; 4. a water inlet pipeline; 5. a water outlet pipeline; 6. a cold water line; 7. a tap water line; 8. preheating a circulating pump; 9. a first temperature sensor; 10. a first valve body; 11. a second valve body; 12. a diversion point; 13. a confluence point; 14. a one-way valve; 15. a flow sensor; 16. a second temperature sensor; 17. a third temperature sensor; 18. a hot water pipeline.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, an embodiment of the present application provides a water heater, which may be but is not limited to a gas water heater, wherein the gas water heater may be a wall-hanging stove, a gas water heater, etc. integrated with a soft water function (module).

Specifically, this hot water system includes: a soft water circuit 1 and a bypass circuit 2 connected in parallel and each of which can be independently conducted or blocked, a preheating circulation pump 8 located upstream or downstream of the soft water circuit 1 and the bypass circuit 2, and a heat exchanger 3 located downstream of the soft water circuit 1 and the bypass circuit 2. The soft water waterway 1 is provided with a softening module for softening water.

Wherein the water heating device has a housing. The heat exchanger 3, the soft water waterway 1 and the bypass waterway 2 are positioned in the shell. The hot water device has a water inlet line 4 for the input of water. A soft water circuit 1 and a bypass water circuit 2 are connected in parallel between the heat exchanger 3 and the water inlet line 4. The heat exchanger 3 is also communicated with a water outlet pipeline 5 for outputting water. The preheating circulating pump 8 is connected to the water inlet pipeline 4. The water outlet end of the water outlet pipeline 5 is communicated with a hot water pipeline 18 to supply water to a water using point.

The hot water device of the embodiment has a preheating circulation mode and a normal water making mode. The hot water device can start the preheating circulating pump 8 in the preheating circulating mode to drive the water in the circulating water path to flow, so that the water in the circulating water path is heated. And the preheating circulating pump stops when the hot water device is in a normal water making mode.

In one embodiment, the heat exchanger 3 is a heat exchange tube type heat exchanger, and the water heating device is provided with a burner, and high-temperature flue gas formed by combustion of the burner exchanges heat with the heat exchange tubes of the heat exchanger 3 to heat water inside the heat exchanger 3. In other embodiments, the heat exchanger 3 is an electrically heated heat exchanger, such as: an electric heating rod is arranged in an inner container to heat water, and the inner container is communicated with the downstream of a parallel water channel formed by the soft water channel 1 and the bypass water channel 2.

The hot water system of this embodiment is through being equipped with parallelly connected soft water route 1 and bypass water route 2 to, soft water route 1 and bypass water route 2 can be independently switched on or block separately, and then can realize exporting hot soft water (the soft water that is heated) or ordinary hot water through the break-make in control soft water route 1 and bypass water route 2, satisfy user's different water demands, promote user and use experience.

The hot water system of this embodiment is through being equipped with bypass water route 2, under the condition that the user need not hot soft water, can introduce the running water into heat exchanger 3 in through bypass water route 2 and heat and form hot water, and need not to change to softening the module, and system stability is higher, satisfies user's different water experiences.

In the present embodiment, the soft water path 1 and the bypass water path 2 may be independently conducted or blocked. The soft water waterway 1 is provided with a softening module for softening water. The soft water path 1 and the bypass path 2 form a parallel path. The preheating circulation pump 8 may be disposed on the main line upstream of the parallel water path or on the main line downstream thereof, and drives water to perform the preheating circulation.

As shown in fig. 1, the soft water passage 1 and the bypass passage 2 have a confluence point 13 and a division point 12 along the inner passage direction, and the water inlet line 4 is communicated with the soft water passage 1 and the bypass passage 2 through the division point 12, respectively. The soft water circuit 1 and the bypass circuit 2 are joined by a junction point 13 and communicate with the intermediate main circuit between the heat exchangers 3 via the junction point 13. When the soft water waterway and the bypass waterway 2 are both in a conducting state, water in the water inlet pipeline 4 is shunted to enter the soft water waterway 1 and the bypass waterway 2 through the shunting point 12, and the water in the soft water waterway 1 and the bypass waterway 2 is recombined through the converging point 13 and then enters the heat exchanger 3 for heating.

A second temperature sensor 16 is located between the confluence point 13 and the inlet of the heat exchanger 3. A flow sensor 15 is located between the confluence point 13 and the inlet of the heat exchanger 3. The positions of the second temperature sensor 16 and the flow sensor 15 are not limited, and the second temperature sensor 16 is located downstream of the flow sensor 15 as shown in fig. 1. The preheating circulation pump 8 and the first temperature sensor 9 are located upstream of the diversion point 12. The preheating circulation pump 8 is located upstream of the first temperature sensor 9.

In this embodiment, the bypass water path 2 is turned on when the soft water path 1 is in the blocking state, and does not affect the water supply to the heat exchanger 3, thereby avoiding affecting the user's water experience when the user does not need soft water. The bypass water path 2 does not soften the water flowing therethrough. Preferably, the bypass water path 2 does not perform a water treatment on the passing water, and the bypass water path 2 is used to establish communication between the water inlet pipeline 4 and the heat exchanger 3, so that the inlet water (such as tap water) of the water inlet pipeline can be input into the heat exchanger 3 for heating without treatment through the bypass water path 2, thereby obtaining ordinary hot water.

Specifically, the bypass water path 2 may be provided by a bypass pipe, or may be provided by a water flow passage provided in the module body, and the present application is not particularly limited. The bypass waterway 2 and the soft water waterway 1 can be conducted or blocked at the same time, or can be in a state of blocking one conduction, wherein the bypass waterway 2 and the soft water waterway 1 can be conducted or blocked respectively according to expectation, or can be automatically switched to the conduction state or the blocking state according to the water use mode of a user, so that water with different qualities can be provided, and different water requirements of the user can be met.

Under the conducting state of the soft water waterway 1, the inlet water enters the soft water waterway 1 and is softened by the soft water module, and the inlet water is heated by the heat exchanger 3 and then outputs hot soft water. The softening module is provided with a resin tank storing softening resin, wherein the hot water device can also be provided with a salt tank structure storing soft water salt. The link of this resin jar is equipped with integrated water route module, and integrated water route module provides corresponding connection port and is linked together with salt case structure, resin jar, water route diverter valve, inlet channel 4, heat exchanger 3. The integrated water path module performs soft water operation or backwashing resin regeneration operation and the like through the switching communication function of the water path switching valve.

In this embodiment, in order to conveniently integrate the softening module into the hot water apparatus, the resin tank is installed in an inverted manner. Wherein the connection port of the resin tank is located at a lower end of the resin tank. The connection port of the resin tank is connected with the integrated waterway module, and the waterway inside the water heating device is integrated through the integrated waterway module, so that the integration level of the system is improved.

In a possible embodiment, the softening module in this embodiment may refer to the patent application with application number 2020206327997 entitled integrated waterway module, softening component and water heater, which is filed on 23/4/2020 by the applicant, and will not be described herein again.

In this embodiment, the hot water device further comprises a first temperature sensor 9 for measuring the inlet water temperature of the hot water device. According to the temperature of the inlet water measured by the first temperature sensor 9, whether the user uses cold water in the preheating cycle can be judged so as to make corresponding adjustment. Specifically, the first temperature sensor 9 is located on the main line upstream of the soft water path 1 and the bypass water path 2. As shown in fig. 1, a first temperature sensor 9 and a preheating circulation pump 8 are disposed on the water inlet line 4.

In this embodiment, the water heating apparatus further includes: a second temperature sensor 16 for measuring the temperature of the incoming water to the heat exchanger 3. In particular, the water heating device further comprises a second temperature sensor 16 located upstream of the heat exchanger 3 and downstream of the soft water circuit 1 and the bypass circuit 2. The second temperature sensor 16 is located on the trunk downstream of the parallel water circuit.

As shown in fig. 1, the water heating apparatus further includes a third temperature sensor 17 for measuring the temperature of the outlet water of the heat exchanger 3. The heating power, for example the combustion power of the burner, can be adjusted according to the leaving water temperature.

In this embodiment, the water heating apparatus further includes: and a flow sensor 15 for measuring the inflow or outflow of water to or from the heat exchanger 3. Wherein a flow sensor 15 is provided upstream or downstream of the soft water circuit 1 and the bypass circuit 2. As shown in fig. 1, the flow sensor 15 is located downstream of the soft water path 1 and the bypass water path 2 and upstream of the heat exchanger 3. A flow sensor 15 and a second temperature sensor 16 are connected in series in the water circuit between the parallel water circuit and the heat exchanger 3.

For realizing that soft water route 1 and bypass water route 2 independently block or switch on, and then for the user provides the water mode that does not use, promote user's use and experience, be equipped with on the soft water route 1 and switch on or block its first valve body 10. The bypass waterway 2 is provided with a second valve body 11 for conducting or blocking the bypass waterway. Wherein the first valve body 10 and the second valve body 11 are located in the housing of the water heating device. The first valve body 10 may be located upstream of the softening module. The first valve body 10 and the second valve body 11 may be on-off solenoid valves to realize automatic control of waterway switching. The first valve body 10 and the second valve body 11 can be independently controlled to be opened and closed, thereby realizing the independent conduction or the blocking of the soft water waterway 1 and the bypass waterway 2

As shown in fig. 1, 2 and 3, in one embodiment of the present application, a method for controlling a preheating cycle of a hot water apparatus is provided. Wherein the hot water device comprises a soft water waterway 1 and a bypass waterway 2 which are connected in parallel and can be independently conducted or blocked, a preheating circulating pump 8 positioned at the upstream or downstream of the soft water waterway 1 and the bypass waterway 2, and a heat exchanger 3 positioned at the downstream of the soft water waterway 1 and the bypass waterway 2; the soft water waterway 1 is provided with a softening module for softening water.

The preheating circulation control method may adopt the hot water device as in the above embodiment, and may be applied to a preheating circulation system in which the cold water line 6 is used as a return pipe. Of course, in some embodiments, the hot water control method may also be applied to a hot water device formed by combining a gas water heater and a water softener, and the application is not limited to the only application.

As shown in fig. 2 and 3, the preheating cycle control method includes: s100, starting the preheating circulating pump 8, and conducting the bypass water path 2 for preheating circulation. And S200, conducting the soft water waterway 1 to perform preheating circulation when the inlet water temperature of the hot water device is increased to be higher than a first preset temperature.

In the present embodiment, the preheating cycle is started by starting the preheating circulation pump 8, and the return water (the water inlet of the hot water apparatus is used as the water return port at this time) is directly introduced into the heat exchanger 3 through the bypass water path 2 to be heated, and at this time, the soft water path 1 is in the blocking state.

It should be noted that the conducting and blocking in each step of the present embodiment can be understood as making the bypass water path 2 or the soft water path 1 in a conducting state or a blocking state, and the conducting state of the bypass water path 2 is specifically formed by switching between a state before use and a state before use, and the present embodiment is not limited. For example, in step S100, the preheating circulation pump 8 is started to conduct the bypass water path 2; if the bypass water path 2 is in a conducting state before the preheating circulation is started, the bypass water path 2 is still in the conducting state, and the bypass water path 2 is kept in the conducting state; if the bypass water path 2 is in the blocking state before the preheating cycle is started, the bypass water path 2 is switched to the conducting state.

The preheat cycle is divided into two phases in this embodiment: a low temperature cycle phase and a high temperature cycle phase. The preheating cycle performed in step S100 is taken as a low-temperature cycle phase, and the preheating cycle performed in step S200 is taken as a high-temperature cycle phase.

In the initial stage of the preheating cycle (low-temperature cycle stage), the change of the inlet water temperature of the hot water device is not obvious, if a user opens the cold water of the water using point, even if the cold water is mixed in the water returned by the hot water device, the inlet water temperature is not increased too much, and then the cold water is used by the water using point, the change of the inlet water temperature of the hot water device is also not obvious, whether the user uses the cold water is difficult to determine according to the temperature change, and the pressure input by the tap water pipeline is discharged by the water using point, so that the inlet water flow of the hot water device is not changed or is changed little, and therefore, the cold water used by the user is difficult to detect according to the inlet water flow.

Based on the above analysis, if the soft water path 1 is in the conducting state at the initial stage of the preheating cycle, the preheating cycle is easily continued to supply soft water because it cannot be known that the water usage point is opened, which causes the hot soft water to enter the water usage point together with the cold water from the cold water line 6 and output after passing through the constant pressure water return valve, further causes the non-user-desired cold water to be provided to the user, but is the warm soft water doped with soft water, which affects the user experience.

In the preheating circulation control method in this embodiment, the bypass water path 2 is conducted when the preheating circulation is started, soft water is not required to be made, and even if the user opens the water consumption point at this time, although the preheating circulation is continuously operated, the water output by the hot water device is normal water and soft water is not output, even if the water consumption point is mixed with cold water through the constant-pressure water return valve and is provided to the user, the normal cold water is still provided to the user, and the cold water is not mixed with soft water, so that the user's demand is met.

The preheating cycle is carried out to the high-temperature cycle stage (S200), because the temperature in the circulation water route has already improved to above first predetermined temperature this moment, even the user uses cold water at the water consumption point, some running water (cold water) can enter into hot water system along with the backward flow in, and then reduce hot water system ' S temperature of intaking for hot water system can learn user ' S water use state and in time switch or block, guarantees user ' S water use and experiences.

In addition, if the circulation water path is established by conducting only the bypass water path 2 in the preheating cycle, a large amount of cold water stored in the softening module having the resin tank, for example, is kept in a cold water state because it does not participate in the preheating cycle. When a user opens a water using point to use hot water after the preheating cycle is finished, the soft water path 1 is communicated with the heat exchanger 3, but factors such as the unstable flame intensity of a heat source such as a burner in the initial stage of combustion or the temperature of the heat exchanger 3 needs to be raised lead to the heat exchanger 3 not performing sufficient heat exchange on the input cold soft water, so that hot soft water with the expected temperature cannot be provided for the user, the hot soft water with the expected temperature can be provided after the heat source lasts for a period of time, and the constant temperature performance is poor.

Based on above problem, this embodiment switches on in preheating the circulation soft water route 1 preheats the circulation to can preheat the water in the soft water route 1, especially the water in the resin tank, and then even the user uses hot water after preheating the circulation, because the water in the soft water route 1 has been preheated, the required heat that heaies up is less, thereby can heat up to the required temperature of user fast, has the constant temperature performance of preferred, satisfies user experience.

Moreover, the preheating circulation control method of the embodiment conducts the bypass water path 2 and the soft water path 1 back and forth, so that water in the bypass water path 2 and the soft water path 1 can be preheated, and after the preheating circulation is finished, no matter the user uses ordinary hot water or hot soft water, hot water with the temperature expected by the user can be provided quickly, and the water demand of the user is met.

As shown in fig. 3, the warm-up cycle method in the present embodiment further includes a warm-up cycle ending step (step S300). Specifically, step S300 includes: when the temperature of the feed water to the heat exchanger 3 increases to the preheating-cycle target temperature, the preheating-cycle pump 8 is turned off. The on-state of soft water route 1 and the block state of bypass water route 2 can be kept when closing preheating circulation pump 8, also can block to lead to bypass water route 2 etc. behind the soft water route 1, and this application does not do the restriction. Wherein the temperature of the inlet water to the heat exchanger 3 is obtained by a second temperature sensor 16 located upstream of the heat exchanger 3 and downstream of the soft water circuit 1 and the bypass circuit 2.

It should be noted that, in the present application, the preheating cycle ending step may not be limited to the above embodiment, and in another embodiment, the preheating cycle ending step may also be conditioned to end the continuous operation time. In the present embodiment, the preheating circulation pump 8 is turned off when the soft water circuit 1 is turned on for a first predetermined time. At this time, when the first predetermined time period is operated in step S200, the preheating circulation pump 8 is turned off to stop the preheating circulation.

With continued reference to fig. 2 and 3, in step S100, the preheating circulation pump 8 is activated, the bypass water path 2 is conducted, and the soft water path 1 is blocked for preheating circulation. This step is performed by the controller of the hot water device as: and closing the first on-off electromagnetic valve, opening the second on-off electromagnetic valve and starting the preheating circulating pump 8.

In step S200, the inlet water temperature of the hot water apparatus is obtained by the first temperature sensor 9 located on the inlet water main upstream of the soft water path 1 and the bypass water path 2. Further, in step S200, when the inlet water temperature of the hot water device increases to a first predetermined temperature or more, the soft water path 1 is turned on and the bypass water path 2 is blocked to perform the preheating cycle. This step is performed by the controller of the hot water device as: and when the inlet water temperature of the hot water device is increased to be higher than a first preset temperature, opening the first on-off electromagnetic valve, closing the second on-off electromagnetic valve, and continuously operating the preheating circulating pump 8.

The blocking of the bypass water path 2 may be performed after the soft water path 1 is turned on. That is, in step S200, the soft water path 1 is turned on and then the bypass water path 2 is blocked to perform the preheating cycle, so that the preheating cycle does not need to be suspended, the continuous preheating cycle can be ensured, and the pressure-holding condition of the system due to the switching of the water paths can be avoided. Of course, it is also feasible to switch on soft water route 1 and block bypass water route 2 simultaneously, even block bypass water route 2 earlier and switch on soft water route 1 again, and this application does not do the only restriction.

In one specific embodiment, as shown in fig. 3, the preheating cycle control method includes: s100, starting the preheating circulating pump 8, conducting the bypass water path 2 and blocking the soft water path 1 for preheating circulation; and S200, conducting the bypass water path 2 and the soft water path 1 for preheating circulation when the inlet water temperature of the hot water device is increased to be higher than a first preset temperature.

In order to avoid that the user turns on the water using point to use the hot water when the cold water circulation stage (performing the step S100) fails to supply the hot soft water, the preheating circulation control method includes: in the process of executing step S100, when the flow rate variation value of the inlet water flow rate or the outlet water flow rate of the heat exchanger 3 is greater than a first predetermined value and the time is greater than a second predetermined time, the bypass water path 2 is blocked and the soft water path 1 is conducted.

Specifically, the hot water apparatus determines whether it is in the process of performing step S100 in the preheating cycle mode according to whether the bypass water path 2 is on (the second on-state solenoid valve is in the on state) or whether the temperature of the intake water increases to the first predetermined temperature. That is, it is determined whether the user uses hot water at the point of water use during the preheating cycle performed with the bypass water path 2 in a conducting state and/or during the preheating cycle performed before the intake water temperature increases to the first predetermined temperature.

In this case, when the water usage point is opened to use hot water, the water supply line 7 is hydraulically introduced into the circulation water path, so that the inflow and outflow of water to and from the hot water device or heat exchanger 3 are increased, and whether or not the user uses hot water is determined by detecting the amount of change in the inflow.

Since the soft water path 1 does not circulate and the hot water apparatus does not output soft water in the cold water circulation stage, soft water is not supplied to the user even if the user opens the water using point to use cold water in this stage, and the cold water inputted from the tap water line 7 is supplied to the water using point through the cold water line 6 in this stage, the change of the flow rate (the water inlet flow rate and the water outlet flow rate of the heat exchanger 3) of the hot water apparatus is small, and the preheating circulation control method does not make a judgment in the case of the user using cold water in this stage, the preheating circulation pump 8 is continuously operated, and the judgment in the case of using hot water by the user is not disturbed.

Considering that if the inflow water flow or the outflow water flow is used as the determination condition, the circulation flow in different areas is different, so that the situation that the inflow water flow or the outflow water flow is directly used as the determination condition and the adaptation scene is limited, based on this consideration, the flow change value is used as the determination condition for determining whether the user uses hot water, and the situation that the water pressure in different areas is different can be adapted.

Further, when the user uses hot water at the stage, hot soft water is provided for the user according to a normal mode, and the user experience is guaranteed. When it is determined that the user uses hot water in the cold water circulation stage, the preheating circulation pump 8 is stopped before the soft water circuit 1 is turned on. The water is driven by the water pressure of the tap water to provide hot soft water for the water using point. Specifically, in the process of executing step S100, when the flow rate change value (for example, the flow rate increase) of the inlet water flow rate or the outlet water flow rate of the heat exchanger 3 is greater than a first predetermined value and the time is greater than a second predetermined time, the preheating circulation pump 8 is stopped, the bypass water path 2 is blocked, and the soft water path 1 is conducted.

Considering that the preheating cycle is not completed, the preheating cycle needs to be restarted after the user finishes using water. Specifically, this case is performed as: and restarting the preheating circulating pump 8 when the water inlet flow or the water outlet flow of the heat exchanger 3 is reduced to be lower than a preset flow value or the flow change value of the water inlet flow or the water outlet flow is larger than a second preset value. Wherein the second predetermined value may be equal to the first predetermined value. Of course, the second predetermined value may be greater than the first predetermined value. When the flow rate variation value of the hot water device is eliminated and/or the flow rate of the hot water device is lower than the predetermined flow rate value (normally, the predetermined flow rate value is 0 because the preheating circulation pump 8 is not started), it is determined that the user has stopped the hot water demand, and the preheating circulation pump 8 is restarted. At this time, the preheating cycle control method may be executed again, and steps S100 and S200 may be performed step by step until the preheating cycle is ended (S300).

Illustrative examples are: when the preheating circulating pump 8 is started, the controller detects and records the water inlet flow of the heat exchanger 3 through the flow sensor 15, the flow in the circulating water path is stable under the normal state of the preheating circulation, and then the controller can record a continuous and stable flow value which is the preheating circulating flow. When the first on-off solenoid valve is in a closed state, the second on-off solenoid valve is in an open state, the inflow water temperature detected by the first temperature sensor 9 is lower than a first preset temperature, the inflow water flow of the heat exchanger 3 detected by the flow sensor 15 is increased from 3.2 liters per minute to 4.0 liters per minute, the flow change value is 0.8 liters per minute, which exceeds 0.7 liters per minute, and the duration of the flow change value exceeding 0.7 liters per minute is more than 3 seconds (the flow of 4.0 liters per minute is maintained more than 3 seconds), the hot water is used at a water consumption point, at the moment, the preheating circulating pump 8 is closed, the second on-off solenoid valve is closed to block the bypass water path 2, the first solenoid valve is opened to conduct the soft water path 1, the water flow is driven by using the water pressure of tap water, and the hot soft water in a common hot water mode is provided for a user.

After a period of time, the user closes the water consumption point to stop the hot water demand, at this time, the water flow in the circulation water path stops, the water inlet flow or the water outlet flow of the hot water device is reduced to below 3 liters per minute (usually, at this time, 0), or the flow change value of the heat exchanger 3 is reduced to 0.5 liters per minute at 4.0 liters per minute, the flow change value (flow reduction) is greater than 1 liter per minute, the user is considered to end the hot water demand, at this time, the second electromagnetic valve is opened to open the bypass water path 2, the first electromagnetic valve is closed to block the soft water path 1, and the preheating circulation pump 8 is opened to execute the preheating circulation again.

In order to avoid that the user cannot supply the general cold water when the user turns on the water using point to use the cold water in the hot water circulation stage (performing step S200), the preheating circulation control method includes: in the process of performing the step S200, when the temperature of the inlet water drops below the second predetermined temperature and the flow rate variation value of the inlet water flow rate or the outlet water flow rate of the heat exchanger 3 is less than a third predetermined value, the soft water path 1 is blocked and the bypass path 2 is conducted. Wherein the second predetermined temperature is less than the first predetermined temperature. The second predetermined temperature and the first predetermined temperature have a temperature difference therebetween, for example, a temperature difference of 5 degrees celsius or more.

Specifically, the hot water apparatus determines whether it is in the process of performing step S200 according to whether the soft water path 1 is on (whether the first on-off solenoid valve is in the on state) or whether the temperature of the intake water is raised to a first predetermined temperature in the preheating circulation mode. That is, during the preheating cycle performed when the soft water circuit 1 is in the on state, and/or during the preheating cycle performed after the inlet water temperature reaches the first predetermined temperature, it is determined whether the user uses cold water at the water consumption point.

In this case, in the case of the water usage point being turned on to use cold water, the water supply line 7 is hydraulically introduced into the circulation water path, causing the temperature of the inlet water of the hot water device to be lowered, and whether or not the user uses cold water is determined by detecting the change in the temperature of the inlet water.

Because in the hot water circulation stage, the bypass water path 2 does not circulate, the hot soft water output by the hot water device is required by the user, thereby even if the user opens the water using point to use hot water in this stage, the hot water device does not need to be correspondingly changed, the conducting state of the soft water path 1 and the heating state of the heat exchanger 3 can be maintained, and further the preheating circulation control method does not change under the condition that the user uses hot water in this stage, the preheating circulation pump 8 continuously operates, meanwhile, because the inflow of the hot water device can be obviously promoted due to the entering of the water pressure when the hot water is used in this stage, and further the judgment of the embodiment when the user uses cold water can not be interfered.

Considering that if the inflow water flow or the outflow water flow is used as the determination condition, the circulation flow in different areas is different, so that the situation that the inflow water flow or the outflow water flow is directly used as the determination condition and the adaptation scene is limited, based on this consideration, the flow change value is used as the determination condition for determining whether the user uses hot water, and the situation that the water pressure in different areas is different can be adapted.

Further, the user can continue to operate in the preheating circulation mode at this stage while using hot water, keeping the preheating circulation pump 8 operating without stopping the pump. When the user uses the cold water at this stage, the operation of the preheating circulation pump 8 is maintained without stopping the pump, and the user can enter the preheating circulation mode of the hot water device again when the user stops using the water, and step S100 is executed. Specifically, in the step of blocking the soft water path 1 and conducting the bypass path 2, the preheating circulation pump 8 is continuously operated.

In this hot water circulation phase, when the user uses cold water, the heat exchanger 3 may stop heating at this time, for example, stop the burner, and may also continue heating, providing the user with an appropriate cold water temperature, and may enter the temperature rise state quickly when continuing the preheating cycle, ensuring the user experience.

In this hot water circulation stage, the preheating circulation pump 8 drives water to supply cold water to the water consumption point. Specifically, during the execution of the preheating cycle of step S200, when the inlet water temperature drops below the second predetermined temperature and the flow rate change value (flow rate increase amount) of the inlet water flow rate or the outlet water flow rate of the heat exchanger 3 is smaller than the third predetermined value, the preheating circulation pump 8 is maintained in operation, the bypass water path 2 is turned on, and the soft water path 1 is blocked.

Illustrative examples are: when the preheating circulating pump 8 is started, the controller detects and records the water inlet flow of the heat exchanger 3 through the flow sensor 15, the flow in the circulating water path is stable under the normal state of the preheating circulation, and then the controller can record a continuous and stable flow value which is the preheating circulating flow. Under the condition that the first on-off solenoid valve is in an open state and the second on-off solenoid valve is in a closed state, the inflow water flow of the heat exchanger 3 detected by the flow sensor 15 is changed from 3.2 liters per minute to 3.3 liters per minute, the flow change value is 0.1 liters per minute, which is lower than 0.5 liters per minute (a third preset value), but the inflow water temperature is reduced from 40 ℃ to 20 ℃ and is lower than 35 ℃ (a second preset temperature), so that the inflow water flow of the water heating device is slightly increased, but the inflow water temperature (return water temperature) is obviously reduced, the water consumption point is determined to be using cold water, at the moment, the operation of the preheating circulating pump 8 is maintained, the first on-off solenoid valve is closed to block the soft water waterway 1, the second solenoid valve is opened to conduct the bypass waterway 2, and normal cold water (the temperature is higher than tap water) is provided for a user.

After a period of time, the user closes the water using point, the cold water demand is stopped, at the moment, the running water stops being supplemented in the circulating water path, at the moment, the bypass water path 2 is in a conducting state, the soft water path 1 is in a blocking state, the preheating circulating pump 8 is in an operating state, and then the step S100 is entered, and the preheating circulation mode can be directly re-entered for preheating circulation.

In one possible embodiment, a warm-up cycle control method of the hot water apparatus includes: s100, conducting the bypass water path 2 and the soft water path 1 for preheating circulation; and S200, when the inlet water temperature of the hot water device is increased to be higher than a first preset temperature, conducting the soft water waterway 1 and blocking the bypass waterway 2 to perform preheating circulation. In the embodiment, during the whole preheating cycle, the soft water path 1 is normally open, and the bypass path 2 is switched to the blocking state after being led on for a period of time until the preheating cycle is finished.

Specifically, when the bypass water path 2 and the soft water path 1 are simultaneously in a conducting state, the flow rate of the bypass water path 2 is greater than that of the soft water path 1. As shown in fig. 1, a check valve 14 (specifically, a check throttle valve) is connected in series to the soft water passage 1, and the flow rate of the bypass passage 2 is made larger than the flow rate of the soft water passage 1 by the throttling action of the check valve 14. More specifically, the flow rate of the bypass water passage 2 is 2 times or more the flow rate of the soft water passage 1.

The preheating circulation control method that this embodiment provided switches on bypass water route 2 and soft water route 1 simultaneously and preheats the circulation in preheating circulation initial stage, and then can reduce the soft water content in hot water unit output aquatic, even user's demand cold water this moment, the soft water content in the cold water of using water point output is not high to can reduce the influence to the experience of using cold water this moment to the user. In addition, the present embodiment can preheat the water in the soft water channel 1 at the initial stage of the preheating cycle without waiting for the water temperature in the whole channel to rise above the first predetermined temperature and then raising the temperature, which not only has the effects of the above embodiments, but also has better constant temperature performance for the hot soft water.

In another possible embodiment, a warm-up cycle control method of the hot water apparatus includes: and simultaneously conducting the bypass water path 2 and the soft water path 1 for preheating circulation. Further, the bypass water path 2 and the soft water path 1 are simultaneously conducted during the operation of the preheating circulation pump 8. That is, the bypass water path 2 and the soft water path 1 are always in a conductive state during the preheating cycle.

Specifically, when the bypass water path 2 and the soft water path 1 are simultaneously in a conducting state, the flow rate of the bypass water path 2 is greater than that of the soft water path 1. As shown in fig. 1, a check valve 14 (specifically, a check throttle valve) is connected in series to the soft water passage 1, and the flow rate of the bypass passage 2 is made larger than the flow rate of the soft water passage 1 by the throttling action of the check valve 14. More specifically, the flow rate of the bypass water passage 2 is 2 times or more the flow rate of the soft water passage 1.

In another embodiment, a warm-up cycle control method of the hot water apparatus includes: and the bypass water path 2 is conducted, and the soft water path 1 is blocked to perform preheating circulation. That is, the bypass waterway 2 is always in a conduction state and the soft water waterway 1 is always in a blocking state during the preheating cycle.

In a preferred embodiment, in order to prevent hot water from being unable to be supplied at a temperature desired by a user at an initial stage of water discharge due to a long initial temperature rise time of hot water supply in a case where a large amount of cold water is stored in a resin tank in a normal use of hot water, a control method of the hot water apparatus includes: when the preheating circulation pump 8 is in a stopped state or the hot water device is in a normal water making mode, and the inflow or outflow of the heat exchanger 3 is increased to be higher than a predetermined flow, the soft water path 1 is conducted after the bypass water path 2 is conducted for a preset time.

In another embodiment, to avoid that the hot water of the temperature desired by the user cannot be provided at the beginning of the water outlet due to a long initial temperature rise time in the case of normal use of the hot water, a control method of the hot water apparatus includes: and under the condition that the preheating circulating pump 8 is in a stop state, when the water inlet flow or the water outlet flow of the heat exchanger 3 is more than the preset flow and the bypass water path 2 is conducted for a preset time, conducting the soft water path 1.

In another embodiment, to avoid that the hot water of the temperature desired by the user cannot be provided at the beginning of the water outlet due to a long initial temperature rise time in the case of normal use of the hot water, a control method of the hot water apparatus includes: and under the condition that the preheating circulating pump 8 is in a stop state and the bypass water path 2 is in a conduction state, when the water inlet flow or the water outlet flow of the heat exchanger 3 is above the preset flow for a preset time, the soft water path 1 is conducted.

The preset time period may be more than 5 seconds, for example, the preheating time period may be 10 seconds. When the water inlet flow or the water outlet flow of the heat exchanger 3 is increased to be higher than a preset flow, the user is determined to open a water using point to use hot water. Preheat the hot water system and not be in when circulating pump 8 is in under the off-state and preheat the circulation mode under, also be that the hot water system is in under the normal system water mode, the user opens the water spot and provides normal hot water earlier with hot soft water (hot water) time hot water system, and not hot soft water, the warm water that introduces in the circulating line through bypass water route 2 heats up fast, provide normal hot water for the user, introduce soft water route 1 after combustor and heat exchanger 3 heat up to steady state, make soft water heat up fast, guarantee user's hot water supply and experience.

In the above control method of the present application, the control method further includes: when the preheating circulating pump 8 is in a starting state, the bypass water path 2 is in a conducting state. The bypass water path 2 is in a conduction state and the soft water path 1 is in a blocking state in the process of the preheating circulation.

During the preheating cycle, the hot water device outputs normal hot water, and the soft water circuit 1 is maintained in a low temperature state without being preheated. When the preheating cycle is completed and the preheating circulation pump 8 is stopped, the bypass water path 2 is maintained in the on state. Correspondingly, whole bypass water route 2 is in by preheating the intensification state, and under the normal water consumption state after preheating the circulation, because the water in bypass water route 2 has been heated when the user uses hot water, and then can rapid heating up, guarantees that the hot water temperature of initial stage supply user is close user's expectation temperature to provide hot soft water after the combustor burning is stable, heat exchanger 3 temperature promotes, so promote hot water heating device's constant temperature performance.

In a specific embodiment, as shown in fig. 4, the control method includes: and preheating circulation is carried out when the bypass water path 2 is in a conduction state, and after the preheating circulation is finished, the soft water path 1 is conducted when the inflow or outflow of the heat exchanger 3 lasts for a preset time duration above a preset flow.

Further, the control method further includes: the warm-up cycle control method as described in any one of the above embodiments. This embodiment is not described in detail.

The application also provides a water heating device, the water heating device is a gas water heating device. Specifically, this hot water system includes: a soft water circuit 1 and a bypass circuit 2 connected in parallel and each of which can be independently conducted or blocked, a preheating circulation pump 8 located upstream or downstream of the soft water circuit 1 and the bypass circuit 2, and a heat exchanger 3 located downstream of the soft water circuit 1 and the bypass circuit 2; the soft water waterway 1 is provided with a softening module for softening water. Preferably, the water heating device is capable of executing the control method as described in any of the above embodiments.

The hot water device in any one of the above embodiments may be applied to a preheating circulation system, wherein an embodiment of the present application further provides a preheating circulation system, including: the hot water unit as described in any one of the above embodiments; a cold water pipeline 6 communicated with the water inlet of the hot water device; a hot water pipeline 18 communicated with the water outlet of the hot water device; and the constant-pressure water return valve is communicated with the cold water pipeline 6 and the hot water pipeline 18.

Wherein, the cold water pipeline 6 or the water inlet of the hot water device is also communicated with a tap water pipeline 7. When the preheating circulating pump 8 operates, the constant-pressure water return valve is opened to communicate the hot water pipeline 18 with the cold water pipeline 6. The constant pressure water return valve is connected with the water consumption point in parallel.

During the preheating cycle, the cold water pipe 6 is used as a return water pipe, and forms a circulation pipe together with the water inlet pipe 4 and the hot water pipe 18. The cold water pipeline 6 is also communicated with a tap water pipeline and is communicated with each water consumption point, and when cold water is used at the water consumption point, the cold water pipeline 6 conveys tap water to the water consumption point for use by a user. The water inlet pipeline 4 is communicated with a tap water pipeline 7 so as to input tap water for heating or softening. Specifically, the water inlet pipeline 4, the cold water pipeline 6 and the tap water pipeline 7 can be communicated through a three-way structure, and the tap water pipeline 7 is communicated with the water inlet pipeline 4 and the cold water pipeline 6 in pairs.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the system embodiment, since the software functions executed by the processor or the controller are basically similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.

Although the present application has been described in terms of embodiments, those of ordinary skill in the art will recognize that there are numerous variations and permutations of the present application without departing from the spirit of the application, and it is intended that the appended claims encompass such variations and permutations without departing from the spirit of the application.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed inventive subject matter.

Claims (10)

1. A water heating apparatus, comprising: the water heater comprises a water inlet pipeline for inputting water, a heat exchanger for heating water, a soft water waterway and a bypass waterway which are connected in parallel between the heat exchanger and the water inlet pipeline, a preheating circulating pump positioned at the upstream or downstream of the soft water waterway and the bypass waterway, and a water outlet pipeline communicated with the heat exchanger and used for outputting water; the soft water waterway and the bypass waterway can be respectively and independently conducted or blocked; the soft water waterway is provided with a softening module for softening water.

2. The water heating apparatus as claimed in claim 1, wherein the preheating circulation pump is connected to the water inlet line.

3. The water heating apparatus according to claim 1, wherein a first temperature sensor is further provided on the water inlet pipeline; the water heating apparatus further includes: a second temperature sensor located upstream of the heat exchanger and downstream of the soft water and bypass waterways.

4. The water heating apparatus as claimed in claim 1, further comprising: a flow sensor located upstream or downstream of the soft water circuit and the bypass circuit.

5. The hot water device of claim 4, wherein the flow sensor is located downstream of the soft water circuit and the bypass circuit and upstream of the heat exchanger.

6. The water heating apparatus as claimed in claim 1, wherein the soft water path is provided with a first valve body for opening or closing the soft water path; and the bypass waterway is provided with a second valve body for conducting or blocking the bypass waterway.

7. The water heating apparatus of claim 6, wherein the first valve body is located upstream of the softening module.

8. The water heating apparatus as claimed in claim 6, wherein the water heating apparatus has a housing; the heat exchanger, soft water waterway, bypass waterway, the first valve body and the second valve body are located in the housing.

9. The hot water device as claimed in claim 1, wherein the softening module comprises a resin tank; the connection port of the resin tank is located at the lower end of the resin tank.

10. A pre-heat cycle system, comprising:

the hot water apparatus as claimed in any one of claims 1 to 9;

a cold water pipeline communicated with the water inlet of the hot water device; the water inlet of the cold water pipeline or the hot water device is also communicated with a tap water pipeline;

the hot water pipeline is communicated with the water outlet of the hot water device;

the constant-pressure water return valve is communicated with the cold water pipeline and the hot water pipeline; and the constant-pressure water return valve is opened when the preheating circulating pump runs to communicate the hot water pipeline with the cold water pipeline.

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