CN212253129U - Zero-cold-water gas water heater with water softener - Google Patents

Abstract

The utility model discloses a zero-cold water gas water heater with a water softener, which comprises a gas water heater main body, a heat exchanger, a main water channel pipeline, a water heater inlet pipe, a hot water pipe, a water return pipe and a controller, wherein the water inlet end of the heat exchanger is connected with the main water channel pipeline, the water outlet end of the heat exchanger is connected with the hot water pipe, the water return pipe is connected between the hot water pipe and the water heater inlet pipe, a pre-filter is arranged on the gas water heater main body, a water softener is arranged in the gas water heater main body, the water inlet end of the pre-filter is connected with the water heater inlet pipe, the water outlet end is connected with the main water channel pipeline, a soft water inlet pipe and a soft water outlet pipe are arranged on the main water channel pipeline, the soft water inlet pipe is connected with the soft water inlet of the water softener, the soft water outlet pipe is connected with the soft, the structure is simple and compact, and the cost is lower.

Description

Zero-cold-water gas water heater with water softener

Technical Field

The utility model relates to a water heater technical field especially relates to a zero cold water gas heater with water softener.

Background

Along with the improvement of living standard, the demand of users on healthy water quality is increasingly strong, most of gas water heaters in the market do not carry the function of soft water bathing, and in order to meet the demand, a preposed filter and a water softener are usually added in front of the water inlet end of a main water channel. However, the complete set of zero-cold water gas water heater, pre-filter and water softener is expensive and occupies a small installation space, especially for small kitchens.

However, the current zero-cold water gas water heater has the following defects:

1. the gas water heater, the pre-filter and the water softener are independent and need to be purchased respectively and then assembled into the zero-cold water gas water heater, so that the total purchase price of the zero-cold water gas water heater is high;

2. water softeners on the market are generally relatively large in size, so that more installation space is occupied, and particularly small-sized kitchens are difficult to install.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the problems that exist among the prior correlation technique at least to a certain extent, for this reason, the utility model provides a zero cold water gas heater with water softener, its simple structure, compactness, the cost is lower.

According to the zero-cold-water gas water heater with the water softening device, the zero-cold-water gas water heater is realized by the following technical scheme:

a zero-cold-water gas water heater with a water softening device comprises a gas water heater main body, a heat exchanger, a main water path pipeline, a water heater water inlet pipe, a hot water pipe, a water return pipe and a controller, wherein the heat exchanger and the main water path pipeline are arranged in the gas water heater main body, the water inlet end of the heat exchanger is connected with the main water path pipeline, the water outlet end of the heat exchanger is connected with the hot water pipe, the water return pipe is connected between the hot water pipe and the water heater water inlet pipe, the controller is electrically connected with the heat exchanger, a front filter is arranged on the gas water heater main body, the water softening device is arranged in the gas water heater main body, the water inlet end of the front filter is connected with the water inlet pipe of the water heater, the water outlet end of the front filter is connected with the main water path pipeline, a soft water, the soft water inlet pipe with water softener's soft water inlet is connected, the soft water outlet pipe with water softener's soft water delivery port is connected.

In some embodiments, an electric three-way valve is disposed at a connection of the main waterway pipeline and the soft water inlet pipe, and the electric three-way valve is electrically connected to the controller.

In some embodiments, a soft water solenoid valve is disposed on the soft water inlet pipe, a main path solenoid valve is disposed between the soft water inlet pipe and the soft water outlet pipe and on the main water path pipeline, and the soft water solenoid valve and the main path solenoid valve are electrically connected to the controller respectively.

In some embodiments, a water pump and a water inlet temperature probe are arranged between the pre-filter and the soft water inlet pipe and on the main water path pipeline, and the water pump and the water inlet temperature probe are respectively electrically connected with the controller.

In some embodiments, a water flow sensing device is disposed between the soft water outlet pipe and the heat exchanger and on the main water path pipeline, and the water flow sensing device is electrically connected to the controller.

In some embodiments, a check valve is disposed on the water return pipe, and the check valve is configured to conduct from the hot water pipe to the water inlet pipe of the water heater in a single direction.

In some embodiments, an operation display is disposed on the gas water heater main body, and the operation display is electrically connected with the controller.

In some embodiments, the water softening device includes soft water control valve, soft water inlet, soft water delivery port, softening tank, salt jar and blow off pipe, wherein be provided with on the soft water control valve soft water inlet with the soft water delivery port, softening tank set up in the salt jar just softening tank with soft water control valve is connected be provided with soft water resin in the softening tank, the blow off pipe respectively with soft water control valve salt jar is connected.

In some embodiments, a screen mesh with a mesh size of 60-100 mesh is disposed within the pre-filter, and a water purification material comprising one or more of activated carbon, KDF, and a scale inhibitor is disposed within the pre-filter.

In some embodiments, the pre-filter is externally hung on the gas water heater main body, and the pre-filter and the gas water heater main body are detachably connected.

Compared with the prior art, the utility model discloses an at least including following beneficial effect:

1. the zero-cold-water gas water heater of the utility model integrates the zero-cold-water gas water heater, the pre-filter and the water softening device together, thereby reducing purchasing cost to a certain extent, effectively saving installation space, simplifying installation pipe distribution, realizing instant use of hot water and outputting bathing soft water;

2. the gas water heater and the water softening device can be controlled to work through the arranged controller and the operation display, the water softening device is not required to be separately provided with the controller and the operation display, and the product cost can be reduced through integration;

3. the zero-cold-water gas water heater and the water softening device are integrated and share the pre-filter, so that the filtering precision is higher, the water flow is large, the blockage is not easy, the cleaning is convenient, and the preheating and high-temperature backwater can be resisted without damage;

4. the pre-filter can be added with high-temperature resistant water purification particles such as KDF, activated carbon, scale inhibitor and the like, so that multiple filtration effects of removing heavy metals, removing odor and chlorine, reducing water hardness and the like are achieved;

5. the main water channel pipeline of the zero-cold-water gas water heater and the water softener adopt a parallel water channel design, the on-off of the main water channel pipeline and the water softener is simultaneously controlled through an electric three-way valve or an electromagnetic valve, and the water channel of the water softener is switched on when the water inlet temperature is low, so that the bathing soft water requirement is met; when the water inlet temperature is too high, the water way of the water softener is blocked, so that the high-temperature preheating return water can be effectively prevented from flowing into the water softener, and an alarm prompt is given.

Drawings

FIG. 1 is a schematic structural diagram of a zero-cold-water gas water heater in a normal shower standby mode in the first embodiment;

FIG. 2 is a schematic structural diagram of a zero-cold-water gas water heater in a preheating mode of operation in the first embodiment;

FIG. 3 is a schematic structural diagram of a zero cold water gas water heater in a normal shower standby mode according to the second embodiment;

FIG. 4 is a schematic structural diagram of a zero-cold-water gas water heater in a preheating mode of operation according to the second embodiment;

FIG. 5 is a control flow chart of the zero cold water gas water heater in the embodiment.

Detailed Description

The present invention is illustrated by the following examples, but the present invention is not limited to these examples. To the embodiment of the present invention, modify or replace some technical features, without departing from the spirit of the present invention, it should be covered in the technical solution scope of the present invention.

The first embodiment is as follows: as shown in fig. 1, 2 and 5, the present embodiment provides a zero-cold water gas water heater with a water softening device, which includes a gas water heater main body 1, a heat exchanger 2, a main water path pipeline 3, a water heater water inlet pipe 4, a hot water pipe 5, a water return pipe 6 and a controller 7, wherein the heat exchanger 2 and the main water path pipeline 3 are disposed in the gas water heater main body 1, a water inlet end of the heat exchanger 2 is connected with the main water path pipeline 3, a water outlet end of the heat exchanger 2 is connected with the hot water pipe 5, the water return pipe 6 is connected between the hot water pipe 5 and the water heater water inlet pipe 4, the controller 7 is electrically connected with the heat exchanger 2, a pre-filter 8 is disposed on the gas water heater main body 1, a water softening device 9 is disposed in the gas water heater main body 1, a water inlet end of the pre-filter 8 is connected with the water heater water inlet pipe 4, a water outlet end, the soft water inlet pipe 91 is connected to the soft water inlet 93 of the water softening device 9, and the soft water outlet pipe 92 is connected to the soft water outlet 94 of the water softening device 9, so that the main water passage pipe 3 and the water softening device 9 form a parallel water flow, and the on/off of the main water passage pipe 3 or the water softening device 9 is controlled by the electric three-way valve 10.

The zero-cold-water gas water heater of the embodiment integrates the zero-cold-water gas water heater, the pre-filter 8 and the water softener 9 together, so that the purchasing cost can be reduced to a certain extent, the installation space can be effectively saved, the installation pipe distribution is simplified, hot water can be used immediately after being started, and bathing soft water can be output.

In addition, the zero-cold-water gas water heater and the water softening device 9 are integrated and share the pre-filter 8, so that the filtering precision is higher, the water flow is large, the blockage is not easy, the cleaning is convenient, and the preheating and high-temperature return water can be resisted without damage.

The zero-cold-water gas water heater can realize that hot water can be used immediately after being opened, provides bathing hot water, and the water softener 9 reduces the water hardness, provides comfortable bathing soft water, effectively prevents the pipeline of the gas water heater from forming scale, and prolongs the service life.

In the present embodiment, an electric three-way valve 10 is provided at the junction of the main waterway pipe 3 and the soft water inlet pipe 91, and the electric three-way valve 10 is electrically connected to the controller 7. Zero cold water gas heater's main water route pipeline 3 adopts parallelly connected water route design with water softener 9, through the break-make in electric three-way valve 10 simultaneous control main water route pipeline and water softener water route, through the water softener 9 whether flows through of the steerable rivers of electric three-way valve 10 that set up to this can satisfy the different shower water demand of user.

Preferably, a water pump 13 and a water inlet temperature probe 14 are arranged between the pre-filter 8 and the soft water inlet pipe 91 and on the main water path pipeline 3, and the water pump 13 and the water inlet temperature probe 14 are respectively and electrically connected with the controller 7. The water inlet temperature of the zero-cold water gas water heater can be monitored in real time through the arranged water inlet temperature probe 14, whether the soft water inlet pipe 91 is conducted or not can be determined according to the water inlet temperature of the zero-cold water gas water heater, and when the water inlet temperature is low, the water way of the soft water device is conducted to meet the bathing soft water requirement; when the water inlet temperature is too high, the water way of the water softener is blocked, so that the high-temperature preheating return water can be effectively prevented from flowing into the water softener, and an alarm prompt is given. Further, the inlet temperature probe 14 is capable of monitoring the inlet temperature in the normal shower mode and the return temperature in the preheat mode.

More preferably, a water flow sensing device 15 is disposed between the soft water outlet pipe 92 and the heat exchanger 2 and on the main water channel 3, and the water flow sensing device 15 is electrically connected to the controller 7. The water flow of the zero-cold-water gas water heater can be monitored in real time through the arranged water flow sensing device 15, so that a data basis is provided for the control of the zero-cold-water gas water heater. Further, the water flow sensing device 15 monitors the water flow passing through the gas water heater main body 1 in real time, thereby controlling the on/off of the water heater.

Furthermore, a check valve 16 is arranged on the water return pipe 6, and the check valve 16 is formed to be communicated from the hot water pipe 5 to the water inlet pipe 4 of the water heater in a one-way mode. Preferably, a return check valve 16 is disposed at the far end of the machine to connect the hot water pipe 5 and the return pipe 6, and the return check valve 16 is turned on in a direction from the hot water to the cold water, so as to prevent the tap water from flowing directly to the hot water faucet through the return pipe 6.

In the present embodiment, the gas water heater main body 1 is provided with an operation display 17, and the operation display 17 is electrically connected to the controller 7. The gas water heater and the water softening device 9 can be controlled to work by the arranged controller 7 and the operation display 17, the controller and the operation display are not required to be arranged on the water softening device 9 independently, and the product cost can be reduced by integration. The operation display 17 is provided with a preheating function key and a soft water function key, and can display the soft water function state, and the preheating function key can turn on or off the preheating function.

Preferably, the water softening device 9 includes a soft water control valve 95, a soft water inlet 93, a soft water outlet 94, a softening tank 96, a salt tank 97 and a sewage drain pipe 98, wherein the soft water control valve 95 is provided with the soft water inlet 93 and the soft water outlet 94, the softening tank 96 is disposed in the salt tank 97 and the softening tank 96 is connected with the soft water control valve 95, the softening tank 96 is provided with soft water resin 99, and the sewage drain pipe 98 is respectively connected with the soft water control valve 95 and the salt tank 97. The soft water control valve 95 is electrically connected with the controller 7 and can receive an instruction of the controller 7 to control the on-off of the water path inside the water softening device 9, so that the functions of the conventional water softeners such as soft water replacement, salt washing, back washing, quick washing and the like are realized. Further, the controller 7 has a water metering function, accumulates the amount of tap water flowing through the water flow sensing device 15 according to the water flow signal fed back by the water flow sensing device 15, and automatically starts the salt washing regeneration function after the accumulated amount of soft water reaches the preset amount of water of the operation display 17, and reactivates the soft water resin 99 in the softening tank 96 to ensure the soft water function of the soft water device 9.

Furthermore, a filter screen is arranged in the pre-filter 8, the mesh number of the filter screen is 60-100 meshes, and the filter material of the pre-filter 8 adopts an ultra-dense filter screen, the mesh number of the ultra-dense filter screen is 60-100 meshes, so that micro particle impurities in water can be isolated, and the water flow is large, is not easy to block and is convenient to clean. In this embodiment, the pre-filter 8 can withstand a high water temperature and is not damaged by the preheated high-temperature return water. In addition, a water purifying material is arranged in the pre-filter 8, and the water purifying material comprises one or more of activated carbon, KDF and a scale inhibitor, so that multiple filtering effects of removing heavy metals, purifying smell, absorbing chlorine, reducing water hardness and the like can be achieved.

Furthermore, the front filter 8 is externally hung on the gas water heater main body 1, the front filter 8 and the gas water heater main body 1 are detachably connected, and the front filter 8 is of an externally hung detachable structure, so that the filter element can be conveniently checked, replaced and cleaned in daily life, and the use experience of a user can be improved.

The working principle of the zero-cold-water gas water heater provided by the embodiment is described as follows:

as shown in fig. 1, in the normal shower standby mode, the remote hot water tap is turned on, and the tap water flows into the main waterway pipe 3 of the gas water heater main body 1 through the water heater inlet pipe 4 and the pre-filter 8. In a common shower mode, the temperature of tap water is low, when the temperature of the inlet water detected by the inlet water temperature probe 14 is lower than the temperature of program soft water, the controller 7 controls the electric three-way valve 10 to conduct the water path of the soft water device 9 and block the main water path pipeline 3, tap water flows through the water inlet pipe 4 of the water heater and the pre-filter 8 to filter out micro particle impurities in the water, then flows through the electric three-way valve 10 and the soft water inlet pipe 91 to enter the soft water device 9, after ion replacement is carried out to reduce the water hardness, and then flows into the main water path pipeline through the soft water outlet pipe 92, when the water flow detected by the water flow sensing device 15 is greater than the program start flow, the gas water heater main.

As shown in fig. 2, the remote hot water faucet is closed, the zero-cold water gas water heater is in a normal shower standby mode, the preheating function is turned on by operating the preheating function key of the display 17, the preheating operation mode of the gas water heater main body 1 is switched, the controller 7 turns on the water pump 13 to drive the hot water pipe 5 and the water return pipe 6 to store water to circularly flow, when the water flow detected by the water flow sensing device 15 is greater than the program start flow, the gas water heater main body 1 is started to ignite and heat the stored water, and the hot water flows through the hot water pipe 5 and the water return pipe 6 and then flows back to the water heater water inlet pipe 4 of.

In the preheating operation mode, preheat the return water and flow into water heater inlet tube 4 again, survey when intaking temperature probe 14 and measure the return water temperature and be higher than program soft water temperature (like 45 ℃), then operation display 17 carries out soft water overtemperature alarm, controller 7 control electric three-way valve 10 switches on main water route pipeline 3 and blocks up the water softening plant 3 water route, then the circulation return water is through leading filter 8, but can not flow into water softening plant 9, prevent that high temperature return water from flowing into water softening plant 9 and harm water softening plant 9's control flap and pipeline. When the water inlet temperature probe 14 detects that the water return temperature is higher than the program preheating temperature, the controller 7 turns off the water pump 13, the gas water heater main body 1 is flamed out, and the circular preheating is stopped.

After the preheating operation mode is exited, the pipeline stored water heat is radiated to the outside, when the water inlet temperature detected by the water inlet temperature probe 14 is reduced and continuously lower than the program soft water temperature, the controller 7 controls the electric three-way valve 10 to switch on the water way of the soft water device 9 again and plug the main water way pipeline 3, the bathing soft water output is recovered, and the soft water overtemperature alarm is synchronously eliminated.

As a further description of the solution of the present invention, as shown in fig. 1, in the standby mode, shower mode or preheating operation mode, when the water inlet temperature detected by the water inlet temperature probe 14 is continuously lower than the programmed soft water temperature (e.g. 45 ℃), the controller 7 controls the electric three-way valve 10 to open the water path of the soft water device 9 and block the main water path pipe 3, so that the tap water can normally flow through the soft water device 9 and output the soft bath water. When the water inlet temperature probe 14 detects that the water inlet temperature is continuously higher than the program soft water temperature, the controller 7 controls the electric three-way valve 10 to block the water path of the water softener 9 and conduct the main water path pipeline 3, so as to prevent the high-temperature water from entering the water softener 9 to damage the valve and the pipeline of the water softener; the operation display 17 can prompt the soft water overtemperature alarm. The temperature of the soft water in the program is generally a fixed value, and can also be set by the parameter setting mode of the controller.

The zero-cold-water gas water heater of the embodiment realizes the on-off control of the water path by the electric three-way valve 10. The water softener 9 is integrally installed inside the shell of the gas water heater main body 1, the pre-filter 8 is designed into an external hanging type detachable structure, and the water softener and the external hanging type detachable structure are integrated on the zero-cold-water gas water heater. In the normal shower standby mode, tap water flows into the main water channel 3 of the gas water heater main body 1 through the water heater inlet pipe 4 and the pre-filter 8. When the inlet water temperature detected by the inlet water temperature probe 14 is lower than the program soft water temperature, the controller 7 controls the electric three-way valve 10 to conduct the water path of the water softener 9 and block the main water path pipeline 3, the tap water flows through the water inlet pipe 4 of the water heater and the pre-filter 8 to filter out micro particle impurities in the water, then flows through the electric three-way valve 10 and the soft water inlet pipe 91 to enter the water softener 9, the ion replacement is carried out to reduce the water hardness, then the tap water flows into the main water path pipeline 3 through the soft water outlet pipe 92, and the water flow sensing device 15 monitors that the water flow is larger than the program start flow rate, the gas water heater main body.

In the preheating working mode, the preheating backwater flows into the water inlet pipe 4 of the water heater again, when the temperature of the backwater detected by the water inlet temperature probe 14 is higher than the temperature of program soft water, the operation display 17 is used for soft water overtemperature alarm, the controller 7 controls the electric three-way valve 10 to conduct the main water pipeline 3 and block the water channel of the water softening device 9, the circulating backwater passes through the pre-filter 8 but cannot flow into the water softening device 9, and the control valve and the pipeline of the water softening device 9 are prevented from being damaged due to the fact that the high-temperature backwater flows into the water softening device 9. When the water inlet temperature probe 14 detects that the water return temperature is higher than the program preheating temperature, the controller 7 turns off the water pump 13, the gas water heater main body 1 is flamed out, and the circular preheating is stopped. After the preheating operation mode is exited, the pipeline stored water heat is radiated to the outside, when the water inlet temperature detected by the water inlet temperature probe 14 is reduced and continuously lower than the program soft water temperature, the controller 7 controls the electric three-way valve 10 to switch on the water way of the soft water device 9 again and plug the main water way pipeline 3, the bathing soft water output is recovered, and the soft water overtemperature alarm is synchronously eliminated.

Example two: as shown in fig. 3, 4 and 5, the zero-cold-water gas water heater provided by the present embodiment is different from the zero-cold-water gas water heater provided by the first embodiment in that: through adopting soft water solenoid valve and main way solenoid valve to replace electric three-way valve, specifically, be provided with soft water solenoid valve 11 on soft water inlet tube 91, be provided with main way solenoid valve 12 between soft water inlet tube 91 and soft water outlet pipe 92, on main waterway pipeline 3, soft water solenoid valve 11, main way solenoid valve 12 respectively with controller 7 electric connection.

As a further explanation of the embodiment, the electric three-way valve of the embodiment is replaced by two electromagnetic valves, so that on-off control of the water path is realized. As shown in fig. 3 and 4, the second embodiment of the present invention is different from the first embodiment in that a main solenoid valve 12 and a soft water solenoid valve 11 are used instead of an original electric three-way valve 10, and the equivalent effect of simultaneously controlling the on-off of the main waterway pipeline 3 and the water softening device 9 is achieved by controlling the on-off of the two solenoid valves. Main path solenoid valve 12 and soft water solenoid valve 11 all are connected with controller 7 electricity, and main path solenoid valve 12 is established at the main waterway pipeline 3 of pre-filter 8 rear end, and is located into the 14 rear ends of temperature probe of intaking to set up soft water inlet tube 91 at main path solenoid valve 12 front end bypass and connect the soft water inlet 93 of water softener 9, set up soft water outlet pipe 92 at main path solenoid valve 12 rear end bypass and connect the soft water delivery port 94 of water softener 9, form the parallelly connected water route of constituteing by main path solenoid valve 12 and water softener 9. The main solenoid valve 12 controls the on-off of the main waterway pipeline 3; the soft water inlet pipe 91 is provided with a soft water electromagnetic valve 11 for controlling the on-off of the water path of the soft water device 9.

As shown in fig. 3 and 4, in the second embodiment of this patent, in the standby mode, shower mode or preheating operation mode, when the water inlet temperature probe 14 detects that the water inlet temperature is continuously lower than the program soft water temperature, the controller 7 opens the soft water solenoid valve 11 to conduct the water path of the soft water device 9 and closes the main path solenoid valve 12 to block the main water path pipe 3, so that the tap water can normally flow through the soft water device 9 to output the bathing soft water. When the water inlet temperature probe 14 detects that the water inlet temperature is continuously higher than the program soft water temperature, the controller 7 controls the soft water solenoid valve 11 to be closed to block the water path of the water softener 9 and opens the main path solenoid valve 12 to conduct the main water path pipeline 3, so as to prevent the high-temperature water from entering the water softener 9 and damaging the water softener valve and pipeline.

As shown in fig. 3, in the second embodiment of this patent, in a normal shower standby mode, a remote hot water faucet is opened, tap water flows into the main water channel 3 of the gas water heater main body 1 through the water inlet pipe 4 and the pre-filter 8, if the tap water temperature is low and the temperature of the inlet water detected by the inlet water temperature probe 14 is lower than the temperature of program soft water, the controller 7 opens the soft water solenoid valve 11 to conduct the water channel of the soft water device 9 and closes the main water solenoid valve 12 to block the main water channel 3, and after the tap water flows through the water inlet pipe 4 and the pre-filter 8 to filter out micro-particle impurities in the water, the tap water flows through the soft water solenoid valve 11 and the soft water inlet pipe 91 to enter the soft water device 9 and then flows into the main water channel 3 through the soft water outlet pipe 92.

In the second embodiment of the present invention, as shown in fig. 4, in the normal shower standby mode, the hot water tap is turned off, the preheating function is started by operating the preheating function key of the display 17, and the controller 7 turns on the water pump 13 to drive the hot water pipe 5 and the water return pipe 6 to store water for circulating flow heating. The preheating backwater flows into the water inlet pipe 4 of the water heater again, when the temperature of the backwater detected by the water inlet temperature probe 14 is higher than the temperature of program soft water, the operation display 17 performs soft water overtemperature alarm, the controller 7 opens the main-path electromagnetic valve 12 to conduct the main water path pipeline 3 and closes the soft water electromagnetic valve 11 to block the water path of the soft water device 9, the circulating backwater passes through the pre-filter 8 but cannot flow into the soft water device 9, and the control valve and the pipeline of the soft water device 9 are prevented from being damaged due to the fact that the high-temperature backwater flows into the soft water device 9.

As shown in fig. 3, the second embodiment of this patent, quits from the preheating mode, and the pipeline stored water heat is radiated to the outside, and when the temperature probe 14 of intaking measured the temperature of intaking and reduced and continuously be less than the soft water temperature of procedure, then controller 7 opens soft water solenoid valve 11 and switches on the water route of water softener 9 again and closes main water route solenoid valve 12 and blocks main water route pipeline 3, resumes bathing soft water output, and eliminates soft water overtemperature alarm in step.

In a second embodiment of the present invention, as shown in fig. 3 and 4, two solenoid valves are used to replace the electric three-way valve to control the on/off of the water path. In the ordinary shower standby mode, open distal end hot water tap, the running water passes through water heater inlet tube 4 and pre-filter 8, flow in the main water route pipeline 3 of gas heater main part 1, if the running water temperature is lower, intake temperature probe 14 surveys into the water temperature and is less than the soft water temperature of procedure, then controller 7 opens soft water solenoid valve 11 and switches on the water route of water softener 9 and closes main water route solenoid valve 12 and blocks up main water route pipeline 3, the running water flows through water heater inlet tube 4, after pre-filter 8 filters the tiny particle impurity in the aquatic, flow through soft water solenoid valve 11 again, soft water inlet tube 91 gets into soft water device 9, flow in main water route pipeline 3 through soft water outlet pipe 92 again, output bathing soft water.

In the preheating working mode, the preheating function is started by operating a preheating function key of the display 17, the controller 7 starts the water pump 13, and the water stored in the hot water pipe 5 and the water return pipe 6 is driven to circularly flow and heat. Preheating backwater flows into the water inlet pipe 4 of the water heater again, when the temperature of the backwater detected by the water inlet temperature probe 14 is higher than the temperature of program soft water, the operation display 17 performs soft water overtemperature alarm, the controller 7 opens the main water solenoid valve 12 to conduct the main water channel pipeline 3 and closes the soft water solenoid valve 11 to block the water channel of the soft water device 9, then circulating backwater passes through the pre-filter 8 and cannot flow into the soft water device 9, after the main water solenoid valve 12 exits from the preheating working mode, the pipeline stored water heat dissipates heat to the outside, when the temperature of the water detected by the water inlet temperature probe 14 is reduced and is continuously lower than the temperature of the program soft water, the controller 7 opens the soft water solenoid valve 11 to conduct the water channel of the soft water device 9 again and closes the main water channel solenoid valve 12 to block the main water channel pipeline 3.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims (10)

1. A zero-cold-water gas water heater with a water softening device comprises a gas water heater main body (1), a heat exchanger (2), a main water path pipeline (3), a water heater water inlet pipe (4), a hot water pipe (5), a water return pipe (6) and a controller (7), wherein the heat exchanger (2) and the main water path pipeline (3) are arranged in the gas water heater main body (1), the water inlet end of the heat exchanger (2) is connected with the main water path pipeline (3), the water outlet end of the heat exchanger (2) is connected with the hot water pipe (5), the water return pipe (6) is connected between the hot water pipe (5) and the water heater water inlet pipe (4), the controller (7) is electrically connected with the heat exchanger (2), and the zero-cold-water gas water heater is characterized in that a front filter (8) is arranged on the gas water heater main body (1), and the water softening device (9) is arranged in, wherein the end of intaking of leading filter (8) with water heater inlet tube (4) are connected, go out the water end with main water route pipeline (3) are connected be provided with soft water inlet tube (91) and soft water outlet pipe (92) on main water route pipeline (3), soft water inlet tube (91) with soft water inlet (93) of water softener (9) are connected, soft water outlet pipe (92) with soft water delivery port (94) of water softener (9) are connected.

2. A zero-cold-water gas water heater with a water softening device according to claim 1, characterized in that an electric three-way valve (10) is arranged at the junction of the main water path pipe (3) and the soft water inlet pipe (91), and the electric three-way valve (10) is electrically connected with the controller (7).

3. The zero-cold-water gas water heater with the water softening device according to claim 1, wherein a soft water solenoid valve (11) is arranged on the soft water inlet pipe (91), a main path solenoid valve (12) is arranged on the main water path pipeline (3) between the soft water inlet pipe (91) and the soft water outlet pipe (92), and the soft water solenoid valve (11) and the main path solenoid valve (12) are respectively electrically connected with the controller (7).

4. The zero-cold-water gas water heater with the water softening device is characterized in that a water pump (13) and a water inlet temperature probe (14) are arranged between the pre-filter (8) and the soft water inlet pipe (91) and on the main waterway pipeline (3), and the water pump (13) and the water inlet temperature probe (14) are respectively and electrically connected with the controller (7).

5. A zero-cold-water gas water heater with a water softening device according to claim 1, 2 or 3, characterized in that a water flow sensing device (15) is arranged on the main water path pipe (3) between the soft water outlet pipe (92) and the heat exchanger (2), and the water flow sensing device (15) is electrically connected with the controller (7).

6. A zero-cold-water gas water heater with a water softening device according to claim 1, 2 or 3, characterized in that a one-way valve (16) is arranged on the return pipe (6), and the one-way valve (16) is configured to conduct from the hot water pipe (5) to the water heater inlet pipe (4) in one way.

7. A zero-cold-water gas water heater with a water softening device according to claim 1, 2 or 3, characterized in that an operation display (17) is arranged on the gas water heater main body (1), and the operation display (17) is electrically connected with the controller (7).

8. The zero-cold-water gas water heater with the water softening device is characterized in that the water softening device (9) comprises a soft water control valve (95), a soft water inlet (93), a soft water outlet (94), a softening tank (96), a salt tank (97) and a sewage discharge pipe (98), wherein the soft water control valve (95) is provided with the soft water inlet (93) and the soft water outlet (94), the softening tank (96) is arranged in the salt tank (97) and the softening tank (96) is connected with the soft water control valve (95), soft water resin (99) is arranged in the softening tank (96), and the sewage discharge pipe (98) is respectively connected with the soft water control valve (95) and the salt tank (97).

9. The zero-cold-water gas water heater with the water softening device is characterized in that a filter screen is arranged in the pre-filter (8) and has the mesh number of 60-100 meshes, and a water purifying material is arranged in the pre-filter (8) and comprises one or more of activated carbon, KDF and scale inhibitor.

10. A zero-cold-water gas water heater with a water softening device according to claim 1, 2 or 3, characterized in that the pre-filter (8) is externally hung on the gas water heater main body (1), and the pre-filter (8) and the gas water heater main body (1) are detachably connected.

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