CN221122553U - Gas water heater - Google Patents

Abstract

The utility model belongs to the technical field of water heaters, and particularly discloses a gas water heater. The gas water heater comprises a combustion device, a main heat exchanger and a condensation heat exchanger which are sequentially arranged along the flow direction of the flue gas, wherein the water inlet end of the condensation heat exchanger is connected with a cold water pipe, and the water outlet end of the main heat exchanger is connected with a hot water pipe; a bypass pipe is connected between the cold water pipe and the water inlet end of the main heat exchanger, and the bypass pipe is connected with the condensing heat exchanger in parallel; a communicating pipe is connected between the water outlet end of the condensation heat exchanger and the water inlet end of the main heat exchanger; the gas water heater also comprises a water flow control device, wherein the water flow control device controls the on-off of the water inlet end of the main heat exchanger and the communicating pipe and the on-off of the water inlet end of the main heat exchanger and the bypass pipe. The gas water heater disclosed by the utility model can improve the utilization rate of the heat of the flue gas, reduce the waiting time of water consumption and improve the use experience of users.

Description

Gas water heater

Technical Field

The utility model relates to the technical field of water heaters, in particular to a gas water heater.

Background

The gas water heater is a water heating device for heating water by high-temperature flue gas generated by gas combustion, and in order to improve the utilization rate of the heat of the flue gas, the condensing gas water heater which adopts a condenser to absorb the waste heat after the flue gas heat exchange is also increasingly widely applied.

The condensing gas water heater provided by the prior art comprises a cold water pipe, a condenser, a main heat exchanger and a hot water pipe which are sequentially connected, high-temperature flue gas generated by gas combustion is changed into medium-temperature flue gas after heat exchange of the main heat exchanger, the medium-temperature flue gas flows to the condenser under the action of a fan, and the heat is further absorbed by the condenser to be changed into low-temperature flue gas; meanwhile, cold water is preheated into warm water by heat exchange with medium-temperature flue gas when flowing through the condenser, and the preheated warm water is heated to hot water with target temperature when flowing through the main heat exchanger.

The condensing gas water heater provided by the prior art can fully utilize heat in flue gas to heat water, but in the process from the water inlet end to the water outlet end of the gas heat exchanger, water sequentially passes through a cold water pipe, a condenser, a main heat exchanger and a hot water pipe, so that a waterway circulation path is longer, and the water flow time and the heat supply time of starting up of a user are influenced; the water quantity can not be controlled when the gas water heater is started, and cold water flows to the main heat exchanger after passing through the condenser, so that a certain time is required for the cold water to reach a target temperature, more cold water can flow out before the water flow reaches the target temperature, the waste of water resources is caused, and the water consumption experience of the gas water heater is reduced; furthermore, as the water inlet pipe of the cold water pipe is longer from the pipeline between the water inlet ends of the main heat exchanger, when the gas water heater is used for the first time, cold water does not reach the main heat exchanger, high-temperature flue gas reaches the main heat exchanger, dry combustion of the main heat exchanger is caused, and the use safety of the main heat exchanger and the gas water heater is affected.

Disclosure of utility model

The utility model aims to provide a gas water heater, which can effectively solve the problems of long waiting time for starting up, large cold water waste and easy dry heating of a main heat exchanger of the existing condensing gas water heater, and improves the use experience of the gas water heater.

The technical problems are solved by the following technical scheme:

the gas water heater comprises a combustion device, a main heat exchanger and a condensation heat exchanger which are sequentially arranged along the flow direction of flue gas, wherein the water inlet end of the condensation heat exchanger is connected with a cold water pipe, and the water outlet end of the main heat exchanger is connected with a hot water pipe;

a bypass pipe is connected between the cold water pipe and the water inlet end of the main heat exchanger, and the bypass pipe is connected with the condensing heat exchanger in parallel;

a communicating pipe is connected between the water outlet end of the condensation heat exchanger and the water inlet end of the main heat exchanger;

The gas water heater also comprises a water flow control device, wherein the water flow control device controls the on-off of the water inlet end of the main heat exchanger and the communicating pipe and the on-off of the water inlet end of the main heat exchanger and the bypass pipe.

Compared with the background technology, the gas water heater has the following beneficial effects: by arranging the bypass pipe, a first water inlet branch and a second water inlet branch which are arranged in parallel are arranged between the water inlet end of the main heat exchanger and the cold water pipe, wherein the first water inlet branch only comprises the bypass pipe, the second water inlet branch comprises the condensation heat exchanger and the communicating pipe, and the second water inlet branch is longer than the first water inlet branch; the water flow control device is adopted to control the conduction of the first water inlet branch pipe and the second water inlet branch pipe, so that the gas water heater can be switched between a quick heating mode in which only the first water inlet branch pipe is conducted and an energy-saving mode in which only the second water inlet branch pipe is conducted, and further when the gas water heater is cold started, the gas water heater can be switched to the quick heating mode first, so that quick hot water output is realized, the water use waiting time of a user is reduced, the discharged cold water quantity is reduced, the resource waste is reduced, and the dry burning probability of the main heat exchanger is reduced; after the gas water heater starts for a period of time, the first water inlet branch pipe is closed, the second water inlet branch pipe is opened, so that the condensation heat exchanger can be utilized to fully absorb the heat of the flue gas, the heat utilization rate is improved, the overall energy efficiency of the gas water heater is improved, and the use experience of the gas water heater is improved.

In one embodiment, the communication tube includes an auxiliary heat exchange tube, the auxiliary heat exchange tube being located between the combustion device and the main heat exchanger.

In one embodiment, the gas water heater comprises a combustion cavity, the upper end of the combustion device stretches into the combustion cavity, the main heat exchanger is located inside the combustion cavity, and the auxiliary heat exchange tube is coiled outside the combustion cavity.

In one embodiment, the water flow control device is provided with a first valve and a second valve, the first valve is used for controlling the on-off of the bypass pipe, the second valve is used for controlling the on-off of the communicating pipe, and the maximum water passing area of the first valve is smaller than the water passing area of the water inlet end of the main heat exchanger and smaller than the water passing area of the cold water pipe.

In one embodiment, the maximum water passage area of the first valve is smaller than the maximum water passage area of the second valve.

In one embodiment, the main heat exchanger comprises a main heat exchange tube, the condensing heat exchanger comprises a condensing tube, and the inner diameter of the main heat exchange tube, the inner diameter of the condensing tube, the inner diameter of the cold water tube and the inner diameter of the communicating tube are all the same.

In one embodiment, the water flow control device comprises a three-way valve, the three-way valve comprises a valve body and a valve core arranged in the valve body, the valve core comprises a first valve and a second valve, the first valve is connected with the water outlet end of the bypass pipe, and the second valve is connected with the water outlet end of the communication pipe;

The valve body further comprises a third valve, the third valve is connected with the water inlet end of the main heat exchanger, and the valve core controls the opening and closing of the first valve and the second valve.

In one embodiment, the water flow control device comprises a first control valve and a second control valve which are arranged in a split way, wherein the first control valve is arranged on the bypass pipe and provided with the first valve;

the second control valve is provided in the communication pipe, and the second control valve has the second valve.

In one embodiment, the second control valve is mounted at an end of the communication pipe remote from the condensation heat exchanger.

In one embodiment, the opening degree of the first valve and the second valve can be adjusted.

Drawings

FIG. 1 is a schematic diagram of a gas water heater according to an embodiment of the present utility model;

Fig. 2 is a schematic structural diagram of a gas water heater according to a second embodiment of the present utility model.

Description of the reference numerals:

1.a combustion device; 2.a cold water pipe; 3.a main heat exchanger; 31. a main heat exchange tube; 32. a heat exchange fin; 33. a heat exchange housing; 4.a hot water pipe; 5.a condensing heat exchanger; 51. a condensing chamber; 511. a water outlet; 52. a condensing tube; 6. a pumping assembly; 61. a blower; 62. a smoke exhaust hood; 63. connecting a smoke pipe; 64. a smoke exhaust pipe; 7. a bypass pipe; 8. a communicating pipe; 81. an auxiliary heat exchange tube; 82. a transfer tube; 9. a water flow control device; 9a, a three-way valve; 9b, a first control valve; 9c, a second control valve; 91. a first valve; 92. a second valve; 10. a combustion chamber; 20. a water inlet flowmeter; 30. a water inlet thermometer; 40. a water outlet thermometer.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Example 1

The embodiment provides a gas water heater, and when it can promote gas water heater's energy efficiency, the cold water volume when reducing the start shortens water waiting time, improves water experience.

As shown in fig. 1, the gas water heater comprises a cold water pipe 2, a hot water pipe 4, a combustion device 1, a main heat exchanger 3 and a condensing heat exchanger 5 which are sequentially arranged along the flow direction of flue gas; the water outlet end of the cold water pipe 2 is connected with the water inlet end of the condensation heat exchanger 5, and the hot water pipe 4 is connected with the water outlet end of the main heat exchanger 3; a bypass pipe 7 is connected between the cold water pipe 2 and the water inlet end of the main heat exchanger 3, and the bypass pipe 7 is connected with the condensing heat exchanger 5 in parallel; a communicating pipe 8 is connected between the water outlet end of the condensation heat exchanger 5 and the water inlet end of the main heat exchanger 3; the gas water heater also comprises a water flow control device 9, wherein the water flow control device 9 controls the on-off of the water inlet end of the main heat exchanger 3 and the communicating pipe 8 and the on-off of the water inlet end of the main heat exchanger 3 and the bypass pipe 7.

The gas water heater provided in this embodiment, through connecting the bypass pipe 7 on the cold water pipe 2, and making the water outlet end of the bypass pipe 7 and the communicating pipe 8 all be connected with the water inlet end of the main heat exchanger 3, make the main heat exchanger 3 have two parallel water inlet branch pipes connected between the water inlet end of the main heat exchanger 3 and the cold water pipe 2, namely the bypass pipe 7 forms the first water inlet branch pipe, and the communicating pipe 8 and the condensation heat exchanger 5 jointly form the second water inlet branch pipe. And because the second water inlet branch pipe comprises the condensation heat exchanger 5 and the communicating pipe 8, the first water inlet branch pipe only comprises the bypass pipe 7, so that the length of the first water inlet branch pipe is smaller than that of the second water inlet branch pipe; meanwhile, the water flow control device 9 is arranged to control the on-off of the water inlet end of the main heat exchanger 3 and the communicating pipe 8 and the on-off of the water inlet end of the main heat exchanger 3 and the bypass pipe 7, so that water can be fed into the main heat exchanger 3 from the first water inlet branch pipe and can be fed into the main heat exchanger 3 from the second water inlet branch pipe in the use process, and the gas water heater provided by the embodiment has a quick heating mode and an energy-saving mode.

When the gas water heater is in the fast hot mode, the bypass pipe 7 is connected with the main heat exchanger 3, the communicating pipe 8 is disconnected with the main heat exchanger 3, namely, the second water inlet branch pipe is in a disconnected state, the first water inlet branch pipe is in a conducting state, cold water entering from the cold water pipe 2 enters into the main heat exchanger 3 through the bypass pipe 7, and the cold water does not need to pass through the condensation heat exchanger 5, so that the path of the cold water entering into the main heat exchanger 3 from the cold water pipe 2 is relatively short, the cold water entering from the cold water pipe 2 can quickly reach the main heat exchanger 3 and be heated by the main heat exchanger 3, the water waiting time when the gas water heater is started can be effectively reduced, the hot water supply efficiency is improved, and the dry burning probability of the main heat exchanger 3 is reduced.

When the gas water heater is in the energy-saving mode, the bypass pipe 7 is disconnected from the main heat exchanger 3, the communicating pipe 8 is connected with the main heat exchanger 3, namely, the second water inlet branch pipe is connected, and the first water inlet branch pipe is disconnected, so that cold water entering from the cold water pipe 2 firstly passes through the condensation heat exchanger 5 and then flows to the main heat exchanger 3 through the communicating pipe 8, thereby, waste heat in medium-temperature flue gas after heat exchange of the main heat exchanger 3 can be absorbed by the condensation heat exchanger 5, and the absorbed heat can preheat water flowing through the condensation heat exchanger 5, so that heat of the flue gas can be fully absorbed, the energy of the gas water heater is improved, and heat loss is reduced.

Namely, when the gas water heater is cold started, the gas water heater can be switched to the quick heating mode firstly, so that quick hot water output is realized, the water waiting time of a user is reduced, the discharged cold water quantity is reduced, the resource waste is reduced, and the dry burning probability of the main heat exchanger 3 is reduced; after the gas water heater starts for a period of time, the first water inlet branch pipe is closed, the second water inlet branch pipe is opened, so that the condensation heat exchanger 5 can be utilized to fully absorb the heat of the flue gas, the heat utilization rate is improved, the overall energy efficiency of the gas water heater is improved, and the use experience of the gas water heater is improved.

In one embodiment, the gas water heater comprises a combustion chamber 10 and a pump assembly 6, the combustion chamber 10 having a combustion chamber, the upper end of the combustion device 1 extending into the combustion chamber 10. The main heat exchanger 3 includes a heat exchange housing 33 and a main heat exchange tube 31 penetrating the heat exchange housing 33, the lower end of the heat exchange housing 33 is connected with the upper end of the combustion chamber 10, and the main heat exchange tube 31 is connected with the hot water pipe 4, the bypass pipe 7 and the communication pipe 8. The condensing heat exchanger 5 includes a condensing chamber 51 and a condensing tube 52 provided inside the condensing chamber 51, and the condensing chamber 51 has a smoke inlet and a smoke outlet. The exhaust component 6 comprises an exhaust hood 62, a fan 61 and an exhaust pipe 64, wherein the lower end of the exhaust hood 62 is connected with the heat exchange shell 33, the upper end of the exhaust hood 62 is connected with the air inlet end of the fan 61, the air outlet end of the fan 61 is connected with the condensation cavity 51 and is communicated with the smoke inlet, and the exhaust pipe 64 is arranged at the smoke outlet.

That is, the combustion chamber 10, the heat exchange housing 33, the exhaust hood 62, the scroll case of the fan 61, and the condensation chamber 51 are sequentially connected to form an inner case having a smoke flow chamber, and a controller of the gas water heater is disposed outside the inner case. When the fan 61 operates, high-temperature flue gas generated by the combustion device 1 sequentially flows through the combustion cavity, the inner cavity of the heat exchange shell 33, the smoke exhaust hood 62, the fan 61 and the condensation cavity 51 and is discharged through the smoke exhaust pipe 64, so that the drainage effect on the flue gas is ensured, the high-temperature flue gas can only flow in the inner shell, the utilization rate of the heat of the flue gas is improved, the high-temperature flue gas is prevented from damaging a controller or other electronic structures in the gas water heater, and the use safety of the gas water heater is improved; meanwhile, the fan 61 is arranged between the fume exhaust hood 62 and the condensation cavity 51, so that the layout flexibility of the condensation heat exchanger 5 in the gas water heater can be improved.

In an embodiment, the condensing heat exchanger 5 is arranged at the side of the fan 61, so that the overall height of the gas water heater is reduced, and the layout flexibility and convenience of the internal structure of the gas water heater are improved; meanwhile, due to the fact that the condensing heat exchanger 5 is used for laterally feeding air, the probability of contact between smoke and condensed water in the condensing cavity 51 can be reduced, and the condensing heat exchange effect of the condensing heat exchanger 5 is guaranteed.

In other embodiments, the condensing heat exchanger 5 may also be disposed above the main heat exchanger 3 and below the blower 61. In other embodiments, the fan 61 may also be arranged below the combustion device 1.

The pumping unit 6 further comprises a connecting smoke tube 63, the connecting smoke tube 63 is connected between the smoke inlet of the condensation cavity 51 and the air outlet end of the fan 61, so that the connection convenience of the fan 61 and the condensation heat exchanger 5 is improved, the tightness after connection is improved, and the setting flexibility of the condensation heat exchanger 5 is improved.

Because condenser pipe 52 can produce the comdenstion water in the in-process of condensing the flue gas, the outlet 511 has been seted up to the bottom of condensation cavity 51, and outlet 511 is connected with the drain pipe, and the comdenstion water that drips from condenser pipe 52 gathers in the bottom of condensation cavity 51 to in the drain pipe is arranged to the outlet 511, in order to realize the drainage of comdenstion water, avoid the comdenstion water to gather in condensation cavity 51.

In an embodiment, the main heat exchanger 3 further comprises heat exchange fins 32, and the main heat exchange tubes 31 are arranged through the heat exchange fins 32, so that the contact area with the flue gas can be increased through the heat exchange fins 32, and the heat exchange efficiency and the heat exchange effect are improved. The specific structure of the main heat exchanger 3 can refer to the prior art, and will not be described in detail.

In one embodiment, to further increase the utilization of the flue gas heat, the communication pipe 8 includes an auxiliary heat exchange pipe 81, and the auxiliary heat exchange pipe 81 is located between the main heat exchanger 3 and the combustion apparatus 1. The arrangement ensures that the high-temperature flue gas generated by the combustion device 1 firstly passes through the auxiliary heat exchange tube 81, exchanges heat with water in the auxiliary heat exchange tube 81, flows to the main heat exchanger 3, exchanges heat with the main heat exchanger 3, becomes medium-temperature flue gas, flows to the condensing heat exchanger 5, exchanges heat with the condensing heat exchanger 5, and becomes low-temperature flue gas; at the same time, cold water enters the condensation heat exchanger 5 from the cold water pipe 2, is heated to form low-temperature water after heat exchange with the medium-temperature flue gas, the low-temperature water is further increased in temperature to become medium-temperature water after heat exchange with the high-temperature flue gas after passing through the auxiliary heat exchange pipe 81, and the medium-temperature water becomes hot water reaching the target temperature after being heated by the main heat exchanger 3.

That is, by providing the auxiliary heat exchange pipe 81, the heat exchange of the flue gas can be performed three times by the auxiliary heat exchange pipe 81, the main heat exchanger 3 and the condensing heat exchanger 5, so that the utilization efficiency of the heat of the flue gas can be increased; meanwhile, the arrangement of the auxiliary heat exchange tube 81 can reduce the temperature of the flue gas flowing to the main heat exchanger 3, so that the problem that the temperature of the water outlet is too high due to small water consumption can be avoided when the water consumption is small, the water consumption safety of the gas water heater is improved, the heat load adjusting range of the gas water heater is increased, and the use experience of the gas water heater is further improved.

In an embodiment, the auxiliary heat exchange tube 81 is coiled outside the combustion chamber 10, so that the auxiliary heat exchange tube 81 can be arranged closer to the combustion device 1, fully absorbs heat of flue gas, and avoids damage to the auxiliary heat exchange tube 81 caused by flame generated by combustion. In other embodiments, the auxiliary heat exchange tube 81 may also be a fin heat exchanger or other existing heat exchanger structure.

In an embodiment, the communicating tube 8 further includes a switching tube 82 connected between the condensation tube 52 and the auxiliary heat exchange tube 81, and the arrangement of the switching tube 82 can reduce the position requirement between the condensation tube 52 and the auxiliary heat exchange tube 81, and improve the connection convenience of the condensation tube 52 and the auxiliary heat exchange tube 81. In one embodiment, the transfer tubes 82 are arranged vertically to reduce floor space. In other embodiments, the transfer tube 82 may be bent, and the structural configuration of the transfer tube 82 should be set according to the relative positions of the condensation tube 52 and the auxiliary heat exchange tube 81.

In an embodiment, the water flow control device 9 has a first valve 91 and a second valve 92, the first valve 91 is used for controlling the on-off of the bypass pipe 7, the second valve 92 is used for controlling the on-off of the communicating pipe 8, and the maximum water passing area of the first valve 91 is smaller than the water passing area of the water inlet end of the main heat exchanger 3 and smaller than the water passing area of the cold water pipe 2.

The maximum water passing area through the first valve 91 is smaller than the water inlet end area of the main heat exchanger 3 and smaller than the water passing area of the cold water pipe 2, so that the water inlet flow of the bypass pipe 7 can be reduced when water is fed, and accordingly when the gas water heater is started, the water flow from the bypass pipe 7 to the main heat exchanger 3 can be reduced on the basis that the water inlet flow of the cold water pipe 2 is unchanged, the water flow with small flow can be rapidly heated to the target temperature, the water waiting time is further reduced, the cold water amount discharged during starting is reduced, and the water use experience is improved.

In one embodiment, the ratio of the maximum water passage area of the first valve 91 to the water passage area of the water inlet end of the main heat exchanger 3 is 0.2 to 0.7, preferably 0.2 to 0.4.

In one embodiment, the maximum water passage area of the first valve 91 is smaller than the maximum water passage area of the second valve 92. Thereby ensuring that the water inflow of the bypass pipe 7 to the main heat exchanger 3 is smaller than the water inflow of the communication pipe 8 to the main heat exchanger 3.

In order to improve the convenience of assembling the gas water heater, the main heat exchanger 3 includes a main heat exchange tube 31, and the inner diameter of the main heat exchange tube 31, the inner diameter of the condensation tube 52, the inner diameter of the cold water tube 2 and the inner diameter of the communication tube 8 are all the same. This kind of setting can improve the connection convenience between each pipeline.

In one embodiment, the water flow control device 9 comprises a three-way valve 9a, the three-way valve 9a comprises a valve body and a valve core arranged in the valve body, the valve core comprises a first valve 91 and a second valve 92, the first valve 91 is connected with the water outlet end of the bypass pipe 7, and the second valve 92 is connected with the water outlet end of the communicating pipe 8; the valve body also comprises a third valve, the third valve is connected with the water inlet end of the main heat exchanger 3, and the valve core controls the opening and closing of the first valve 91 and the second valve 92. The three-way valve 9a is in communication connection with a controller of the gas water heater.

By providing the three-way valve 9a for the water flow control device 9, the connection structure between the bypass pipe 7 and the communication pipe 8 and the main heat exchanger 3 can be simplified, the structure of the water flow control device 9 can be simplified, and the control convenience of the controller on the water flow control device 9 can be improved.

In an embodiment, the opening degree of the first valve 91 and the opening degree of the second valve 92 are adjustable, so that the flow rates of the bypass pipe 7 and the communicating pipe 8 can be adjusted, the gas water heater can be adjusted through the opening degree of the first valve 91 and the opening degree of the second valve 92, smooth transition between the quick heating module and the energy-saving mode is realized, the fluctuation amplitude of the water outlet temperature of the hot water pipe 4 is reduced, and the water use experience is improved.

When the gas water heater is just started, the first valve 91 can be opened to the maximum opening, and the second valve 92 is closed, namely the gas water heater is in a rapid heating mode; after the rapid heating mode continues for a preset time, or after the outlet water temperature of the hot water pipe 4 reaches the preset temperature, the opening of the first valve 91 can be gradually reduced, the opening of the second valve 92 can be increased until the opening of the first valve 91 is reduced to zero, and the second valve 92 reaches the maximum opening, so that the smooth transition from the rapid heating mode to the energy-saving mode is realized.

For controlling the operation of the combustion device 1 and better controlling the operation of the water flow control device 9, the cold water pipe 2 is provided with a water inlet thermometer 30, and the water inlet thermometer 30 is used for detecting the temperature of cold water flowing into the cold water pipe 2. The hot water pipe 4 is provided with a water outlet thermometer 40, the water outlet thermometer 40 is used for detecting the temperature of water in the hot water pipe 4, so as to detect the water outlet temperature of the gas water heater, and the water inlet thermometer 30 and the water outlet thermometer 40 are both in communication connection with the controller.

Further, the cold water pipe 2 is provided with a water inlet flow meter 20, and the water inlet flow meter 20 is used for detecting the water inlet flow of the cold water pipe 2, namely the water use flow of the gas water heater, so as to control the heating load of the combustion device 1. The intake flowmeter 20 is communicatively coupled to the controller.

The rest of the structure of the gas water heater can be set by referring to the prior art, which is not the key point of the utility model and will not be repeated here.

Example two

The embodiment provides a gas water heater, and the gas water heater provided in the embodiment is basically the same as the first embodiment, only has a difference in partial arrangement, and the embodiment does not describe the same contents as the first embodiment.

As shown in fig. 2, in the present embodiment, the water flow control device 9 includes a first control valve 9b and a second control valve 9c which are separately provided, the first control valve 9b being provided on the bypass pipe 7 and having a first valve 91; a second control valve 9c is provided on the communication pipe 8, the second control valve 9c having a second valve 92.

The gas water heater provided by this embodiment controls the on-off of two water inlet branch pipes respectively by arranging the first control valve 9b on the bypass pipe 7 and the second control valve 9c on the communicating pipe 8, so that the first valve 91 and the second valve 92 can be regulated independently, thereby improving the regulation flexibility of the water flow control device 9.

The first control valve 9b and the second control valve 9c are electromagnetic valves, and the first control valve 9b and the second control valve 9c are in communication connection with a controller.

Further, the second control valve 9c is installed at an end of the communication pipe 8 remote from the condensation heat exchanger 5. When the communicating pipe 8 is disconnected, cold water in the communicating pipe 8 is prevented from entering the main heat exchanger 3 as much as possible, and the heating efficiency of the gas water heater is improved in a rapid heating mode; meanwhile, the problem that the auxiliary heat exchange tube 81 is evacuated and dry combustion caused by the fact that the second control valve 9c is arranged on the upstream of the auxiliary heat exchange tube 81 can be avoided, and the use safety and reliability of the auxiliary heat exchange tube 81 can be guaranteed.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing detailed description of the embodiments presents only a few embodiments of the present utility model, which are described in some detail and are not intended to limit the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The gas water heater is characterized by comprising a combustion device (1), a main heat exchanger (3) and a condensation heat exchanger (5) which are sequentially arranged along the flow direction of flue gas, wherein the water inlet end of the condensation heat exchanger (5) is connected with a cold water pipe (2), and the water outlet end of the main heat exchanger (3) is connected with a hot water pipe (4);

A bypass pipe (7) is connected between the cold water pipe (2) and the water inlet end of the main heat exchanger (3), and the bypass pipe (7) is connected with the condensing heat exchanger (5) in parallel;

A communicating pipe (8) is connected between the water outlet end of the condensation heat exchanger (5) and the water inlet end of the main heat exchanger (3);

The gas water heater further comprises a water flow control device (9), and the water flow control device (9) controls the on-off of the water inlet end of the main heat exchanger (3) and the communicating pipe (8) and the on-off of the water inlet end of the main heat exchanger (3) and the bypass pipe (7).

2. A gas water heater according to claim 1, wherein the communication pipe (8) comprises an auxiliary heat exchange pipe (81), the auxiliary heat exchange pipe (81) being located between the combustion device (1) and the main heat exchanger (3).

3. A gas water heater according to claim 2, characterized in that it comprises a combustion chamber (10), the upper end of the combustion device (1) extending into the combustion chamber (10), the main heat exchanger (3) being located inside the combustion chamber (10), the auxiliary heat exchange tube (81) being coiled outside the combustion chamber (10).

4. A gas water heater according to any one of claims 1-3, wherein the water flow control device (9) is provided with a first valve (91) and a second valve (92), the first valve (91) is used for controlling the on-off of the bypass pipe (7), the second valve (92) is used for controlling the on-off of the communicating pipe (8), and the maximum water through area of the first valve (91) is smaller than the water through area of the water inlet end of the main heat exchanger (3) and smaller than the water through area of the cold water pipe (2).

5. The gas water heater according to claim 4, wherein the maximum water passage area of the first valve (91) is smaller than the maximum water passage area of the second valve (92).

6. A gas water heater according to claim 5, wherein the main heat exchanger (3) comprises a main heat exchange tube (31), the condensing heat exchanger (5) has a condensing tube (52), and the inner diameter of the main heat exchange tube (31), the inner diameter of the condensing tube (52), the inner diameter of the cold water tube (2) and the inner diameter of the communicating tube (8) are all the same.

7. The gas water heater according to claim 4, characterized in that the water flow control device (9) comprises a three-way valve (9 a), the three-way valve (9 a) comprises a valve body and a valve core arranged in the valve body, the valve core comprises the first valve (91) and the second valve (92), the first valve (91) is connected with the water outlet end of the bypass pipe (7), and the second valve (92) is connected with the water outlet end of the communicating pipe (8);

The valve body further comprises a third valve, the third valve is connected with the water inlet end of the main heat exchanger (3), and the valve core controls the opening and closing of the first valve (91) and the second valve (92).

8. The gas water heater according to claim 4, characterized in that the water flow control device (9) comprises a first control valve (9 b) and a second control valve (9 c) arranged separately, the first control valve (9 b) being arranged on the bypass pipe (7) and having the first valve (91);

The second control valve (9 c) is provided with a communication pipe (8), and the second control valve (9 c) has the second valve (92).

9. A gas water heater according to claim 8, wherein the second control valve (9 c) is mounted at the end of the communication pipe (8) remote from the condensation heat exchanger (5).

10. The gas water heater according to claim 4, characterized in that the opening of the first valve (91) and the second valve (92) is adjustable.