Gas Heating Hot Water Boiler

Abstract

The present invention relates to a gas heating hot water boiler, comprising: a main heat exchanger, a plate heat exchanger, a secondary heat exchanger, a burner, a fan, a first switching valve, a heating hot water pipe, a heating return pipe, a bathroom water inlet pipe, and a bathroom water outlet pipe; the main heat exchanger is connected to the heating hot water pipe and the heating return pipe; the plate heat exchanger is connected between the heating hot water pipe and the heating return pipe, and the plate heat exchanger is also connected to the bathroom water inlet pipe and the bathroom water outlet pipe; the secondary heat exchanger is connected between the plate heat exchanger and the heating hot water pipe, or, the secondary heat exchanger is connected between the plate heat exchanger and the bathroom water outlet pipe; the burner is arranged corresponding to the main heat exchanger, and the fan is arranged corresponding to the secondary heat exchanger; the first switching valve is connected between the plate heat exchanger and the heating hot water pipe. It is realized that when the bathroom function is used, heating can also be carried out, effectively avoiding the drop in indoor temperature, effectively improving the user's comfort and experience effect, and effectively ensuring the user's health.

Description

Technical Field

[0001] The invention relates to the technical field of household heating equipment, in particular to a gas heating water boiler. Background Art

[0002] As people's living standards continue to improve, people have higher and higher requirements for indoor heating comfort. People generally use gas heating water boilers to achieve heating and bathroom functions.

[0003] When a traditional gas-fired hot water boiler is used for heating, the high-temperature flue gas generated by the combustion of the burner heats the water in the system through the main heat exchanger. The heated water flows through the radiator installed indoors under the drive of the circulation pump, and dissipates heat to the room through the radiator, so that the room temperature rises and the purpose of heating is achieved. At this time, the bathroom function is in a closed state. When the user needs to use the bathroom function, the circulating hot water in the system is isolated from the bathroom water through the plate heat exchanger. The heated bathroom water flows out of the sanitary hot water outlet, but the circulating hot water cannot flow through the radiator installed indoors to dissipate heat to the room, causing the indoor temperature to drop, affecting the user's comfort indoors, and easily causing the user to catch a cold, endangering the user's health. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a gas heating water heater which can provide heating when using the bathroom function.

[0005] The above technical problems are solved by the following technical solutions:

[0006] A gas heating hot water boiler comprises: a main heat exchanger, a plate heat exchanger, a secondary heat exchanger, a burner, a fan, a first switching valve, a heating hot water pipe, a heating return pipe, a bathroom water inlet pipe, and a bathroom water outlet pipe; the main heat exchanger is connected to the heating hot water pipe and the heating return pipe; the plate heat exchanger is connected between the heating hot water pipe and the heating return pipe, and the plate heat exchanger is also connected to the bathroom water inlet pipe and the bathroom water outlet pipe; the secondary heat exchanger is connected between the plate heat exchanger and the heating hot water pipe, or, the secondary heat exchanger is connected between the plate heat exchanger and the bathroom water outlet pipe; the burner is arranged corresponding to the main heat exchanger, and the fan is arranged corresponding to the secondary heat exchanger; the first switching valve is connected between the plate heat exchanger and the heating hot water pipe.

[0007] The gas heating water heater of the present invention has the following beneficial effects compared with the background technology: when using the bathroom function, the first switching valve is adjusted to connect the plate heat exchanger with the heating hot water pipe, the heat generated by the burner heats the circulating water flowing through the main heat exchanger, the heated circulating water flows to the secondary heat exchanger through the heating hot water pipe for partial heat exchange to heat the airflow flowing through the secondary heat exchanger, the fan transports the airflow heated by the secondary heat exchanger to the room for heating, the bathroom water flows to the plate heat exchanger through the bathroom water inlet pipe, the circulating water after partial heat release in the secondary heat exchanger flows to the plate heat exchanger to heat the bathroom water flowing through the plate heat exchanger, and the heated bathroom water is discharged through the bathroom outlet pipe for use by the user. It is realized that heating can also be performed when using the bathroom function, effectively avoiding the drop in indoor temperature, effectively improving the user's comfort and experience effect, and effectively ensuring the user's health.

[0008] In one embodiment, the first switching valve is a three-way valve, which has a first valve port, a second valve port and a third valve port. The first valve port and the second valve port are both connected to a heating hot water pipe, and the third valve port is connected to a heat exchange water inlet of the plate heat exchanger. When the heating function is used, the first valve port is connected to the second valve port; when the bathroom function is used, the first valve port is connected to the third valve port.

[0009] In one embodiment, when the secondary heat exchanger is connected between the plate heat exchanger and the heating hot water pipe, the first switching valve is located between the water outlet end of the secondary heat exchanger and the plate heat exchanger; the gas heating hot water boiler also includes a second switching valve, which is connected between the water inlet end of the secondary heat exchanger and the heating hot water pipe, and the second switching valve is located upstream of the first switching valve along the flow direction of circulating water in the heating hot water pipe.

[0010] In one embodiment, the second switching valve is a three-way valve, and the second switching valve has a first interface, a second interface and a third interface. The first interface and the second interface are both connected to the heating hot water pipe, and the third interface is connected to the water inlet end of the secondary heat exchanger; when the heating function is used, the first interface and the second interface are connected; when the bathroom function is used, the first interface and the third interface are connected.

[0011] In one of the embodiments, the method further comprises an air heater for preheating the air flow flowing to the secondary heat exchanger.

[0012] In one embodiment, the air heater, the fan and the secondary heat exchanger are arranged in sequence, and the air heater, the fan and the secondary heat exchanger are connected in sequence through an air pipe to form an air flow channel; or, the air heater, the secondary heat exchanger and the fan are arranged in sequence, and the air heater, the secondary heat exchanger and the fan are connected in sequence through an air pipe to form an air flow channel.

[0013] In one of the embodiments, an expansion water tank is also included, and the expansion water tank is connected to the heating return pipe.

[0014] In one of the embodiments, a circulation pump is also included, and the circulation pump is connected to the heating return pipe.

[0015] In one of the embodiments, a gas valve is further included, and the gas valve is connected to the burner.

[0016] In one of the embodiments, the bathroom water inlet pipe is also connected to the heating return pipe, and the gas heating hot water boiler also includes a water replenishment valve connected between the bathroom water inlet pipe and the heating return pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a gas-fired hot water boiler according to an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the structure of a gas-fired hot water boiler according to another embodiment of the present invention;

[0019] The meanings of the symbols in the accompanying drawings are:

[0020] Shell 10, air inlet 11, air outlet 12, main heat exchanger 20, plate heat exchanger 30, secondary heat exchanger 40, burner 50, fan 60, first switching valve 70, heating hot water pipe 80, heating return pipe 90, bathroom inlet pipe 100, bathroom outlet pipe 110, heat exchange inlet pipe 120, heat exchange outlet pipe 130, second switching valve 140, air heater 150, gas pipe 160, expansion water tank 170, circulation pump 180, gas valve 190, water replenishment valve 200. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0027] Please refer to Figure 1 , a gas heating hot water boiler according to an embodiment of the invention includes a housing 10, a main heat exchanger 20, a plate heat exchanger 30, a secondary heat exchanger 40, a burner 50, a fan 60, a first switching valve 70, a heating hot water pipe 80, a heating return pipe 90, a bathroom water inlet pipe 100 and a bathroom water outlet pipe 110. The main heat exchanger 20, the plate heat exchanger 30, the secondary heat exchanger 40, the burner 50, the fan 60 and the first switching valve 70 are arranged in the housing 10. The main heat exchanger 20 is connected to the heating hot water pipe 80 and the heating return pipe 90. The plate heat exchanger 30 is connected between the heating hot water pipe 80 and the heating return pipe 90, and the plate heat exchanger 30 is also connected to the bathroom water inlet pipe 100 and the bathroom water outlet pipe 110. The secondary heat exchanger 40 is connected between the plate heat exchanger 30 and the heating hot water pipe 80. The first switching valve 70 is connected between the plate heat exchanger 30 and the heating hot water pipe 80. The burner 50 is arranged corresponding to the main heat exchanger 20, and the fan 60 is arranged corresponding to the secondary heat exchanger 40.

[0028] Specifically, the main heat exchanger 20 has a heating water outlet and a heating water inlet that are interconnected. Further, the main heat exchanger 20 includes a main fin group and a main heat exchange tube that is inserted through the main fin group. The main heat exchange tube is tortuous, and the two ends of the main heat exchange tube are respectively a heating water outlet and a heating water inlet. One end of the heating hot water pipe 80 is connected to the heating water outlet of the main heat exchanger 20, and the other end of the heating hot water pipe 80 is used to connect to an external radiator. One end of the heating return water pipe 90 is connected to the heating water inlet of the main heat exchanger 20, and the other end of the heating return water pipe 90 is used to connect to a radiator. It can be understood that the burner 50 burns gas to generate high-temperature flue gas, and the heat in the high-temperature flue gas is transferred to the main fin group, and then transferred to the main heat exchange tube through the main fin group to heat the circulating water flowing through the main heat exchange tube. The heated circulating water is discharged through the heating outlet of the main heat exchanger 20 and the heating hot water pipe 80 in turn, and the circulating water after heat exchange flows back to the main heat exchange tube through the heating return pipe 90 and the heating water inlet of the main heat exchanger 20 in turn.

[0029] The plate heat exchanger 30 has a heat exchange water inlet and a heat exchange water outlet that are interconnected, and a cold water inlet and a hot water outlet that are interconnected. The gas heating hot water boiler also includes a heat exchange water inlet pipe 120 and a heat exchange water outlet pipe 130. The two ends of the heat exchange water inlet pipe 120 are respectively connected to the heat exchange water inlet of the plate heat exchanger 30 and the heating hot water pipe 80, and the two ends of the heat exchange water outlet pipe 130 are respectively connected to the heat exchange water outlet of the plate heat exchanger 30 and the heating return water pipe 90. One end of the bathroom water inlet pipe 100 is the cold water inlet of the plate heat exchanger 30, and the other end of the bathroom water inlet pipe 100 is used to connect to the external tap water pipe. One end of the bathroom water outlet pipe 110 is connected to the hot water outlet of the plate heat exchanger 30, and the other end of the bathroom water outlet pipe 110 is used to connect to bathroom equipment. It can be understood that when the bathroom function is used, the external bathroom water enters the plate heat exchanger 30 through the bathroom water inlet pipe 100 and the cold water inlet of the plate heat exchanger 30 in turn. At the same time, the circulating water in the heating hot water pipe 80 enters the plate heat exchanger 30 through the heat exchange water inlet pipe 120 and the heat exchange water inlet in turn for heat exchange, so as to heat the bathroom water flowing through the plate heat exchanger 30. The heated bathroom equipment is discharged in turn through the hot water outlet of the plate heat exchanger 30 and the bathroom water outlet pipe 110. The circulating water after heat exchange flows to the heating return water pipe 90 through the heat exchange water outlet and the heat exchange water outlet pipe 130 of the plate heat exchanger 30 in turn.

[0030] The secondary heat exchanger 40 has a water inlet and a water outlet. Specifically, the secondary heat exchanger 40 includes a secondary fin group and a secondary heat exchange tube that is inserted through the secondary fin group. The secondary heat exchange tube is tortuous, and the two ends of the secondary heat exchange tube are respectively a water inlet and a water outlet. In this embodiment, the water inlet and the water outlet of the secondary heat exchanger 40 are both connected to the heating hot water pipe 80, and the first switching valve 70 is located between the water outlet of the secondary heat exchanger 40 and the plate heat exchanger 30. Specifically, the first switching valve 70 is a three-way valve, and the first switching valve 70 has a first valve port, a second valve port, and a third valve port. The first valve port and the second valve port are both connected to the heating hot water pipe 80, and the third valve port is connected to the heat exchange water inlet of the plate heat exchanger 30. Further, the third valve port is connected to the hot water inlet through the heat exchange water inlet pipe 120, that is, the third valve port is connected to the end of the heat exchange water inlet pipe 120 away from the heat exchange water inlet. When the heating function is used, the first valve port is connected to the second valve port, and the circulating water in the heating hot water pipe 80 flows through the first valve port and the second valve port of the first switching valve 70 in sequence; when the bathroom function is used, the first valve port is connected to the third valve port, and the circulating water in the heating hot water pipe 80 flows through the first valve port and the third valve port of the first switching valve 70 in sequence.

[0031] The gas heating water heater also includes a second switching valve 140, which is connected between the water inlet end of the secondary heat exchanger 40 and the heating water pipe 80, and the second switching valve 140 is located upstream of the first switching valve 70 along the flow direction of the circulating water in the heating water pipe 80, that is, the second switching valve 140 is located between the first switching valve 70 and the main heat exchanger 20. Specifically, the second switching valve 140 is also a three-way valve, and the second switching valve 140 has a first interface, a second interface and a third interface, the first interface and the second interface are both connected to the heating water pipe 80, and the third interface is connected to the water inlet end of the secondary heat exchanger 40. When the heating function is used, the first interface and the second interface are connected, and the circulating water in the heating water pipe 80 flows through the first interface and the second interface of the second switching valve 140 in sequence; when the bathroom function is used, the first interface and the third interface are connected, and the circulating water in the heating water pipe 80 flows through the first interface and the third interface of the second switching valve 140 in sequence.

[0032] In some embodiments, the gas heating water heater further includes an air heater 150, which is used to preheat the airflow flowing to the secondary heat exchanger 40. It can be understood that the air heater 150 first preheats the airflow to a preset temperature, and the airflow preheated to the preset temperature flows to the secondary heat exchanger 40 to continue heating and heating. Since the temperature difference between the outdoor cold airflow and the hot water in the secondary heat exchanger 40 is large, the air heater 150 is set to preheat the airflow flowing to the secondary heat exchanger 40, which effectively avoids the outdoor cold airflow directly exchanging heat with the hot water flowing through the secondary heat exchanger 40, resulting in a large amount of heat in the hot water being taken away, so that the bathroom hot water temperature is too low and cannot meet the bathroom temperature requirements. In addition, it can effectively avoid a large amount of condensed water generated when the outdoor cold airflow directly exchanges heat with the hot water, accumulating inside the shell 10 and damaging the components of the shell 10 or directly dripping into the room and affecting the user's experience.

[0033] The air heater 150, the fan 60 and the secondary heat exchanger 40 are arranged in sequence, that is, the air heater 150 is located on the side of the fan 60 away from the secondary heat exchanger 40, and the air heater 150, the fan 60 and the secondary heat exchanger 40 are connected in sequence through the air pipe 160 to form an air flow channel, and the fan 60 is a blower. Specifically, the shell 10 is provided with an air inlet 11 and an air outlet 12, and the air pipe 160 is arranged between the air inlet 11 and the air heater 150, between the air heater 150 and the fan 60, and between the fan 60 and the secondary heat exchanger 40. It can be understood that the air inlet 11, the air heater 150, the fan 60 and the secondary heat exchanger 40 are connected in sequence through the air pipe 160 to form an air flow channel, and the secondary heat exchanger 40 is arranged correspondingly to the air outlet 12. When in use, the fan 60 delivers the external air flow to the air heater 150 through the air inlet 11. The air heater 150 heats the air flow to a preset constant temperature. The preheated air flow flows into the fan 60. The fan 60 blows the preheated air flow to the secondary heat exchanger 40 in a blowing manner for heat exchange and continued heating.

[0034] In other embodiments, the air heater 150, the secondary heat exchanger 40 and the fan 60 are arranged, that is, the secondary heat exchanger 40 is located between the fan 60 and the air heater 150, and the air heater 150, the secondary heat exchanger 40 and the fan 60 are sequentially connected through the air pipe 160 to form an air flow channel. Thus, the fan 60 delivers the airflow heated by the secondary heat exchanger 40 to the room in a suction manner, effectively reducing the pressure loss of the components constituting the air flow channel, reducing the operating noise, and being able to adapt to a fan 60 with lower power, saving costs.

[0035] The gas heating water heater further comprises an expansion water tank 170, a circulation pump 180 and a gas valve 190. The expansion water tank 170 is connected to the heating water return pipe 90. The heating water return pipe 90 is used to relieve the pressure when the gas heating water heater is heated and expanded. The circulation pump 180 is connected to the heating water return pipe 90. The circulation pump 180 is used to transport the circulating water in the heating water return pipe 90 to the main heat exchanger 20. The gas valve 190 is connected to the burner 50. Specifically, the gas valve 190 is arranged on the pipeline connected to the gas inlet of the burner 50. When the burner 50 is used, the gas valve 190 is opened, and the gas flows to the burner 50 through the gas valve 190 for combustion; when the burner 50 is not used, the gas valve 190 is closed.

[0036] In some embodiments, the bathroom water inlet pipe 100 is also connected to the heating water return pipe 90, and the gas heating water heater further includes a water supply valve 200 connected between the bathroom water inlet pipe 100 and the heating water return pipe 90. Specifically, the gas heating water heater further includes a connecting pipe, the two ends of which are respectively connected to the bathroom water inlet pipe 100 and the heating water return pipe 90, and the water supply valve 200 is arranged on the connecting pipe. When it is necessary to add water to the heating water return pipe 90, the water supply valve 200 is opened, and the external tap water flows to the heating water return pipe 90 through the bathroom water inlet pipe 100 and the connecting pipe in turn. After the water supply is completed, the water supply valve 200 is closed.

[0037] Figure 1 The working process of the gas heating water heater of the embodiment shown is as follows:

[0038] When the heating function is used, the first switching valve 70 is adjusted so that the first valve port and the second valve port of the first switching valve 70 are connected, and the first valve port and the third valve port, as well as the second valve port and the third valve port are disconnected, that is, there is no connection between the heat exchange water inlet pipe 120 and the heating hot water pipe 80; at the same time, the second switching valve 140 is adjusted so that the first interface and the second interface of the second switching valve 140 are connected, and the first interface and the third interface, as well as the second interface and the third interface are disconnected, that is, there is no connection between the water inlet end of the secondary heat exchanger 40 and the heating hot water pipe 80; the high-temperature flue gas generated by the burner 50 during combustion heats the circulating water flowing through the main heat exchanger 20, and the heated circulating water directly flows to the external radiator through the heating hot water pipe 80 for heat exchange, and the circulating water after heat exchange flows back to the main heat exchanger 20 through the heating return pipe 90 for heating, and the cycle continues in this way.

[0039] When the bathroom function is used, the first switching valve 70 is adjusted to make the first valve port and the third valve port of the first switching valve 70 conductive, and the first valve port and the second valve port, as well as the second valve port and the third valve port disconnected, that is, the heat exchange water inlet pipe 120 and the heating hot water pipe 80 are conductive; at the same time, the second switching valve 140 is adjusted to make the first interface and the third interface conductive, and the first interface and the second interface, as well as the second interface and the third interface disconnected, that is, the water inlet end of the secondary heat exchanger 40 and the heating hot water pipe 80 are conductive; the fan 60 is operated to make the external air flow first flow through the air heater 150 for preheating, and the preheated air flow then flows to the secondary heat exchanger 40, and at the same time, the burner 50 burns, and the high-temperature flue gas generated when the burner 50 burns impinges on the circulating water inlet flowing through the main heat exchanger 20 The heated circulating water flows to the secondary heat exchanger 40 through the heating hot water pipe 80 for partial heat exchange to heat the airflow flowing through the secondary heat exchanger 40, and the airflow heated by the secondary heat exchanger 40 flows to the indoor room for heating: the bathroom water flows to the plate heat exchanger 30 through the bathroom water inlet pipe 100, and the circulating water after partial heat exchange in the secondary heat exchanger 40 flows to the plate heat exchanger 30 through the heating hot water pipe 80 to continue heat exchange to heat the bathroom water flowing through the plate heat exchanger 30, and the bathroom water heated in the plate heat exchanger 30 flows through the bathroom outlet pipe 110 to be discharged for use by users, and the circulating water after heat exchange in the plate heat exchanger 30 flows back to the main heat exchanger 20 through the heating return pipe 90 for heating, and the cycle continues.

[0040] In the embodiment shown in FIG. 2 , the secondary heat exchanger 40 is connected between the plate heat exchanger 30 and the bathroom water outlet pipe 110 . Specifically, the water inlet of the secondary heat exchanger 40 is connected to the hot water outlet of the plate heat exchanger 30 through a water pipe, and the water outlet of the secondary heat exchanger 40 is connected to the bathroom water outlet pipe 110 .

[0041] Figure 2 The working process of the gas heating water heater of the embodiment shown is as follows:

[0042] When the heating function is used, the first switching valve 70 is adjusted to make the first valve port and the second valve port of the first switching valve 70 conductive, and the first valve port and the third valve port, as well as the second valve port and the third valve port disconnected, that is, the heat exchange water inlet pipe 120 and the heating hot water pipe 80 are not conductive; the high-temperature flue gas generated by the burner 50 when burning heats the circulating water flowing through the main heat exchanger 20, and the heated circulating water directly flows to the external radiator through the heating hot water pipe 80 for heat exchange, and the circulating water after heat exchange flows back to the main heat exchanger 20 through the heating return water pipe 90 for heating, and the cycle continues.

[0043] When the bathroom function is used, the first switching valve 70 is adjusted to make the first valve port and the third valve port of the first switching valve 70 connected, and the first valve port and the second valve port, and the second valve port and the third valve port are disconnected, that is, the heat exchange water inlet pipe 120 and the heating hot water pipe 80 are connected; the bathroom water flows to the plate heat exchanger 30 through the bathroom water inlet pipe 100, and the fan 60 is operated to make the external air flow flow through the air heater 150 for preheating, and the preheated air flow then flows to the secondary heat exchanger 40. At the same time, the burner 50 burns, and the high-temperature flue gas generated by the burner 50 during combustion heats the circulating water flowing through the main heat exchanger 20. The heated circulating water flows through the heating hot water pipe 80 to the plate heat exchanger 30 for heat exchange, so as to heat the bathroom water flowing through the plate heat exchanger 30. The circulating water after heat exchange in the plate heat exchanger 30 flows back to the main heat exchanger 20 through the heating return pipe 90, and the bathroom water heated by the plate heat exchanger 30 flows to the secondary heat exchanger 40 for partial heat exchange, so as to heat the airflow flowing through the secondary heat exchanger 40. The fan 60 transports the airflow heated by the secondary heat exchanger 40 to the room for heating. The bathroom water after partial heat exchange in the secondary heat exchanger 40 is discharged through the bathroom outlet pipe 110 for user use.

[0044] The gas heating hot water boiler of the present invention has the following beneficial effects compared with the background technology: if the secondary heat exchanger 40 is connected between the plate heat exchanger 30 and the heating hot water pipe 80, when the bathroom function is used, the first switching valve 70 is adjusted to make the plate heat exchanger 30 and the heating hot water pipe 80 conductive, the heat generated by the burner 50 heats the circulating water flowing through the main heat exchanger 20, and the heated circulating water flows through the heating hot water pipe 80 to the secondary heat exchanger 40 for partial heat exchange to heat the airflow flowing through the secondary heat exchanger 40, and the wind The machine 60 conveys the air flow heated by the secondary heat exchanger 40 to the indoor room for heating, and the bathroom water flows to the plate heat exchanger 30 through the bathroom water inlet pipe 100. The circulating water after partial heat release in the secondary heat exchanger 40 flows to the plate heat exchanger 30 to heat the bathroom water flowing through the plate heat exchanger 30. The heated bathroom water is discharged through the bathroom outlet pipe 110 for user use, and the circulating water after heat exchange in the plate heat exchanger 30 flows back to the main heat exchanger 20 through the heating return pipe 90. If the secondary heat exchanger 40 is connected between the plate heat exchanger 30 and the bathroom outlet pipe 110, when the bathroom function is used, the first switching valve 70 is adjusted to connect the plate heat exchanger 30 with the heating hot water pipe 80, and the bathroom water flows into the plate heat exchanger 30 through the bathroom inlet pipe 100. The heat generated by the burner 50 heats the circulating water flowing through the main heat exchanger 20. The heated circulating water flows into the plate heat exchanger 30 through the heating hot water pipe 80 to exchange heat, so as to heat the The bathroom water flowing through the plate heat exchanger 30, the circulating water after heat exchange flows back to the main heat exchanger 20 through the heating return pipe 90, and the bathroom water heated by the plate heat exchanger 30 flows to the secondary heat exchanger 40 for partial heat exchange to heat the airflow flowing through the secondary heat exchanger 40. The fan 60 transports the airflow heated by the secondary heat exchanger 40 to the room for heating, and the bathroom water after partial heat exchange in the secondary heat exchanger 40 is discharged through the bathroom outlet pipe 110 for user use. It is achieved that heating can also be performed when the bathroom function is used, effectively avoiding the drop in indoor temperature, effectively improving the user's comfort and experience effect, and effectively ensuring the user's health.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A gas-fired hot water boiler, characterized in that: include: A main heat exchanger (20), a plate heat exchanger (30), a secondary heat exchanger (40), a burner (50), a fan (60), a first switching valve (70), a heating hot water pipe (80), a heating return pipe (90), a bathroom water inlet pipe (100), and a bathroom water outlet pipe (110); the main heat exchanger (20) is connected to the heating hot water pipe (80) and the heating return pipe (90); the plate heat exchanger (30) is connected between the heating hot water pipe (80) and the heating return pipe (90), and the plate heat exchanger (30) is also connected to the bathroom water inlet pipe (100) and the bathroom water outlet pipe (110); the secondary heat exchanger (40) is connected between the plate heat exchanger (30) and the heating hot water pipe (80), or the secondary The heat exchanger (40) is connected between the plate heat exchanger (30) and the bathroom water outlet pipe (110); the burner (50) is arranged corresponding to the main heat exchanger (20), and the fan (60) is arranged corresponding to the secondary heat exchanger (40); the first switching valve (70) is connected between the plate heat exchanger (30) and the heating hot water pipe (80), and the first switching valve (70) has a first valve port, a second valve port and a third valve port, the first valve port and the second valve port are both connected to the heating hot water pipe (80), and the third valve port is connected to the heat exchange water inlet of the plate heat exchanger (30); when the heating function is used, the first valve port and the second valve port are connected; when the bathroom function is used, the first valve port and the third valve port are connected.

2. The gas heating water heater according to claim 1, characterized in that: The first switching valve (70) is a three-way valve.

3. The gas heating water heater according to claim 1, characterized in that: When the secondary heat exchanger (40) is connected between the plate heat exchanger (30) and the heating hot water pipe (80), the first switching valve (70) is located between the water outlet end of the secondary heat exchanger (40) and the plate heat exchanger (30); the gas heating hot water boiler also includes a second switching valve (140), the second switching valve (140) is connected between the water inlet end of the secondary heat exchanger (40) and the heating hot water pipe (80), and the second switching valve (140) is located upstream of the first switching valve (70) along the flow direction of the circulating water in the heating hot water pipe (80).

4. The gas heating water heater according to claim 3, characterized in that: The second switching valve (140) is a three-way valve. The second switching valve (140) has a first interface, a second interface and a third interface. The first interface and the second interface are both connected to the heating hot water pipe (80), and the third interface is connected to the water inlet end of the secondary heat exchanger (40); when the heating function is used, the first interface and the second interface are connected; when the bathroom function is used, the first interface and the third interface are connected.

5. The gas-fired hot water heater according to claim 1, characterized in that: Also included is an air heater (150) for preheating the air flow to the secondary heat exchanger (40).

6. The gas-fired hot water heater according to claim 5, characterized in that: The air heater (150), the fan (60) and the secondary heat exchanger (40) are arranged in sequence, and the air heater (150), the fan (60) and the secondary heat exchanger (40) are connected in sequence through an air pipe to form an air flow channel; or, the air heater (150), the secondary heat exchanger (40) and the fan (60) are arranged in sequence, and the air heater (150), the secondary heat exchanger (40) and the fan (60) are connected in sequence through an air pipe to form an air flow channel.

7. The gas-fired hot water heater according to claim 1, characterized in that: It also includes an expansion water tank (170), and the expansion water tank (170) is connected to the heating water return pipe (90).

8. The gas-fired hot water heater according to claim 1, characterized in that: It also includes a circulation pump (180), and the circulation pump (180) is connected to the heating water return pipe (90).

9. The gas heating water heater according to claim 1, characterized in that: It also includes a gas valve (190), wherein the gas valve (190) is connected to the burner (50).

10. The gas heating water heater according to claim 1, characterized in that: The bathroom water inlet pipe (100) is also connected to the heating water return pipe (90), and the gas heating hot water boiler also includes a water replenishment valve (200) connected between the bathroom water inlet pipe (100) and the heating water return pipe (90).

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