A dual-purpose furnace

Abstract

The present invention discloses a dual-purpose stove, comprising a combustion heat exchange device (1); a heat exchanger (2); a heat exchange pipe (3); a heating water inlet pipe (4a) and a heating water outlet pipe (4b); a domestic water inlet pipe (5a) and a domestic water outlet pipe (5b); a delivery pump (6); and an expansion water tank (8), which has a heating water chamber (8121) for accommodating and replenishing the expansion and contraction of circulating water in a circulation loop, wherein the heating water chamber (8121) is connected to the heat exchange pipe (3) or the heating water inlet pipe (4a) through a pipe. The invention is characterized in that the expansion water tank (8) also has a domestic water channel (8122) capable of exchanging heat with the heating water chamber (8121), and at least a portion of the domestic water inlet pipe (5a) passes through the domestic water channel (8122). Compared with the prior art, the dual-purpose stove of the present invention can increase the water outlet speed of domestic hot water in winter and prevent domestic hot water from scalding users in summer.

Description

Technical Field

[0001] The invention relates to the technical field of heating equipment, in particular to a dual-purpose furnace. Background Art

[0002] Currently, some homes are equipped with hydrothermal heating systems, such as floor heating. In addition to domestic water supply, these homes also require additional water for the corresponding hydrothermal heating systems. Therefore, conventional gas water heaters cannot simultaneously supply hot water for domestic use and heating water for the hydrothermal heating systems. Therefore, a dual-purpose boiler is required to provide both domestic hot water and heating water.

[0003] In existing dual-purpose furnaces, a three-way valve is used to switch between the internal and external circulations: in heating mode, the dual-purpose furnace switches to the external circulation, the heat exchange pipe is connected to the heating pipe, and under the action of the circulation pump, the water in the heat exchange pipe is heated by the combustion heat exchange device and then discharged into the heating pipe. The hot water flows through each room through the external circulation, thereby achieving heating; in domestic hot water mode, the dual-purpose furnace switches to the internal circulation, the heat exchange pipe itself forms a circulation loop, and under the action of the circulation pump, the hot water exchanges heat with the domestic water pipe when flowing through the heat exchanger through the internal circulation, thereby achieving the supply of domestic hot water. At this time, the heat exchange pipe is not connected to the heating pipe, the external circulation is interrupted, the water in the heating pipe is dead water, and the heating automatically stops until the use of domestic hot water is finished. For the specific structure, please refer to the Chinese invention patent application number CN201710624991.4 (publication number CN108061375A) previously applied by the applicant, "A Dual-purpose Furnace Working System".

[0004] However, the above-mentioned dual-purpose boiler has the following problems: on the one hand, when using domestic hot water in winter, the water flow rate is slow, and each time the hot water tap is turned on, cold water needs to be released for a long time; on the other hand, when using domestic hot water in summer, due to the high inlet temperature of domestic water, temperature overshoot is very likely to occur, resulting in the risk of scalding.

[0005] In addition, the main function of a dual-purpose boiler is to meet the user's domestic hot water needs and winter heating needs. In recent years, in order to improve the user's comfort, more and more dual-purpose boiler products have added zero cold water functions. It mainly adds a circulating water pump in the domestic water channel and combines it with a one-way valve installed in the water channel to allow domestic water to circulate internally. After this cycle runs and is heated, when you open the hot water faucet at any water point, you no longer need to release a section of cold water, and hot water can be directly discharged, achieving zero waiting for hot water. This function can greatly improve the user's comfort.

[0006] However, there are certain limitations to using the zero cold water function. The heating and domestic hot water of the dual-purpose furnace share a heating system, which mainly relies on the three-way valve in the system to switch the heating water line to achieve independent operation of heating and domestic water (only one of heating and domestic hot water can be operated, domestic hot water takes priority, and they cannot be operated at the same time). For dual-purpose furnaces with zero cold water function, the zero cold water function needs to be turned on all day or during the scheduled period for the user experience to be optimal. However, in winter, when the zero cold water function is used for a long time, the heating function will be stopped for a long time, which will affect the heating of the user's home, resulting in the house temperature not meeting the requirements, affecting the heating experience. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to provide a dual-purpose boiler capable of increasing the water output speed of domestic hot water in winter in response to the current status of the existing technology.

[0008] The second technical problem to be solved by the present invention is to provide a dual-purpose boiler which can prevent domestic hot water from scalding users in summer.

[0009] The third technical problem to be solved by the present invention is to provide a dual-purpose stove that can avoid the conflict between the zero cold water function and the heating experience.

[0010] The technical solutions adopted by the present invention to solve the above-mentioned first and second technical problems are as follows: a dual-purpose furnace, comprising a combustion heat exchange device, comprising a heat exchanger having a heat exchange channel;

[0011] A heat exchanger having a hot water channel and a cold water channel for mutual heat exchange;

[0012] The heat exchange pipe includes a first heat exchange section and a second heat exchange section connected in sequence, wherein at least a portion of the first heat exchange section passes through the heat exchange channel of the heat exchanger, and at least a portion of the second heat exchange section passes through the hot water channel of the heat exchanger;

[0013] A heating water inlet pipe and a heating water outlet pipe are respectively connected to the two ends of the first heat exchange section and are respectively used to connect to the two ends of the external heating pipeline;

[0014] A domestic water inlet pipe and a domestic water outlet pipe are respectively connected to both ends of the cold water channel of the heat exchanger;

[0015] a delivery pump, installed on the first heat exchange section; and

[0016] An expansion water tank having a heating water chamber for accommodating and replenishing the expansion and contraction of circulating water in a circulation loop, the heating water chamber being connected to the heat exchange pipe or the heating water inlet pipe through a pipeline;

[0017] The second heat exchange section and the heating water outlet pipe are both provided with valves so that the dual-purpose furnace has at least two states:

[0018] In the first state, the second heat exchange section is connected and the heating water outlet pipe is disconnected;

[0019] In the second state, the second heat exchange section is disconnected and the heating water outlet pipe is connected;

[0020] The feature is that the expansion water tank further comprises a domestic water channel capable of exchanging heat with the heating water chamber, and at least a portion of the domestic water inlet pipe passes through the domestic water channel.

[0021] In order to facilitate the formation of the heating water chamber and the domestic water channel, the expansion water tank includes a box body and a flexible diaphragm arranged in the box body. The flexible diaphragm divides the internal space of the box body into a gas chamber and a liquid chamber. A heat-conducting partition is installed in the liquid chamber. The heat-conducting partition divides the inner cavity of the liquid chamber into the heating water chamber and the domestic water channel.

[0022] In order to fully exchange heat between the domestic water in the domestic water channel and the heating water in the heating water chamber, the inlet and outlet ends of the domestic water channel are respectively located at the lower and upper parts of the box body.

[0023] In order to facilitate the entry and exit of heating water in the heating water chamber, the water inlet and outlet of the heating water chamber are located at the lower part of the box body and share the same port, which is connected to the heat exchange pipe or heating water inlet pipe through a pipeline.

[0024] In order to facilitate the inflation of the gas chamber, the top of the box body is provided with an inflation port which is in communication with the gas chamber.

[0025] In order to improve the heat exchange efficiency of the heating water chamber and the domestic water channel, the surface of the heat-conducting partition is stamped to form grooves or convex humps arranged in a serpentine shape.

[0026] In order to facilitate the setting of valves on the second heat exchange section and the heating water outlet pipe, the second heat exchange section and the heating water outlet pipe share the same three-way valve, which has a water inlet end, a first water outlet end and a second water outlet end. The water inlet end of the three-way valve is connected to the first heat exchange section, the first water outlet end of the three-way valve is connected to the second heat exchange section, and the second water outlet end of the three-way valve is connected to the heating water outlet pipe.

[0027] In order to facilitate the pressure relief of the heating pipeline, a pressure relief valve is provided on the heat exchange pipeline or the heating water inlet pipe.

[0028] In order to facilitate the replenishment of water flow in the heating pipeline, a water supply pipe is connected between the domestic water inlet pipe and the heating water inlet pipe or the heating water outlet pipe, and a water supply valve is installed on the water supply pipe for controlling the on-off of the water supply pipe.

[0029] In order to facilitate the supply of heat to the heat exchanger, the combustion heat exchange device also includes a burner for supplying heat to the heat exchanger.

[0030] The technical solution adopted by the present invention to solve the third technical problem is: a dual-purpose furnace, comprising

[0031] The combustion heat exchange device includes a heat exchanger having a heat exchange channel;

[0032] A heat exchanger having a hot water channel and a cold water channel for mutual heat exchange;

[0033] The heat exchange pipe includes a first heat exchange section and a second heat exchange section connected in sequence, wherein at least a portion of the first heat exchange section passes through the heat exchange channel of the heat exchanger, and at least a portion of the second heat exchange section passes through the hot water channel of the heat exchanger;

[0034] A heating water inlet pipe and a heating water outlet pipe are respectively connected to the two ends of the first heat exchange section and are respectively used to connect to the two ends of the external heating pipeline;

[0035] A domestic water inlet pipe and a domestic water outlet pipe are respectively connected to both ends of the cold water channel of the heat exchanger;

[0036] A domestic water return pipe, with both ends connected to the domestic water inlet pipe and the domestic water outlet pipe, and a one-way valve is provided on the domestic water return pipe to allow only domestic water to be transported from the domestic water outlet pipe to the domestic water inlet pipe;

[0037] a delivery pump, installed on the first heat exchange section; and

[0038] An expansion water tank having a heating water chamber for accommodating and replenishing the expansion and contraction of circulating water in a circulation loop, the heating water chamber being connected to the heat exchange pipe or the heating water inlet pipe through a pipeline;

[0039] The second heat exchange section and the heating water outlet pipe are both provided with valves so that the dual-purpose furnace has at least two states:

[0040] In the first state, the second heat exchange section is connected and the heating water outlet pipe is disconnected;

[0041] In the second state, the second heat exchange section is disconnected and the heating water outlet pipe is connected;

[0042] The feature is that the expansion water tank further comprises a domestic water channel capable of exchanging heat with the heating water chamber, and at least a portion of the domestic water inlet pipe passes through the domestic water channel.

[0043] In order to facilitate the formation of the heating water chamber and the domestic water channel, the expansion water tank includes a box body and a flexible diaphragm arranged in the box body. The flexible diaphragm divides the internal space of the box body into a gas chamber and a liquid chamber. A heat-conducting partition is installed in the liquid chamber. The heat-conducting partition divides the inner cavity of the liquid chamber into the heating water chamber and the domestic water channel.

[0044] In order to fully exchange heat between the domestic water in the domestic water channel and the heating water in the heating water chamber, the inlet and outlet ends of the domestic water channel are respectively located at the lower and upper parts of the box body.

[0045] In order to facilitate the entry and exit of heating water in the heating water chamber, the water inlet and outlet of the heating water chamber are located at the lower part of the box body and share the same port, which is connected to the heat exchange pipe or heating water inlet pipe through a pipeline.

[0046] In order to facilitate the inflation of the gas chamber, the top of the box body is provided with an inflation port which is in communication with the gas chamber.

[0047] In order to improve the heat exchange efficiency of the heating water chamber and the domestic water channel, the surface of the heat-conducting partition is stamped to form grooves or convex humps arranged in a serpentine shape.

[0048] In order to facilitate the setting of valves on the second heat exchange section and the heating water outlet pipe, the second heat exchange section and the heating water outlet pipe share the same three-way valve, which has a water inlet end, a first water outlet end and a second water outlet end. The water inlet end of the three-way valve is connected to the first heat exchange section, the first water outlet end of the three-way valve is connected to the second heat exchange section, and the second water outlet end of the three-way valve is connected to the heating water outlet pipe.

[0049] In order to facilitate the pressure relief of the heating pipeline, a pressure relief valve is provided on the heat exchange pipeline or the heating water inlet pipe.

[0050] In order to facilitate the replenishment of water flow in the heating pipeline, a water supply pipe is connected between the domestic water inlet pipe and the heating water inlet pipe or the heating water outlet pipe, and a water supply valve is installed on the water supply pipe for controlling the on-off of the water supply pipe.

[0051] In order to facilitate the circulation of domestic water, the domestic water inlet pipe, the domestic water outlet pipe or the domestic water return pipe is provided with a circulation pump for transporting domestic water from the domestic water outlet pipe to the domestic water inlet pipe.

[0052] Compared with the prior art, the advantages of the present invention are:

[0053] (1) A heating water chamber for accommodating and replenishing the expansion and contraction of circulating water in the circulation loop and a domestic water channel for heat exchange with the heating water chamber are provided in the expansion water tank, and at least a portion of the domestic water inlet pipe passes through the domestic water channel. In this way, on the one hand, when domestic hot water is used in winter, the domestic water inlet temperature is relatively low. At this time, the domestic water inlet first flows through the expansion water tank for heat exchange and preheating, thereby increasing the water outlet speed of the domestic hot water; on the other hand, when domestic hot water is used in summer, the domestic water inlet temperature is relatively high. The domestic water inlet first flows through the expansion water tank for heat exchange and cooling, thereby preventing domestic hot water from scalding users in summer;

[0054] (2) The circulation of domestic water is realized by connecting the domestic water inlet pipe and the domestic water outlet pipe with the domestic water return pipe, and a heating water chamber for accommodating and replenishing the expansion and contraction of the circulating water in the circulation loop and a domestic water channel for heat exchange with the heating water chamber are set in the expansion water tank, and at least part of the domestic water inlet pipe passes through the domestic water channel. In this way, during the heating process, if the zero cold water function is turned on, the domestic water channel of the expansion water tank is used to realize full-time heat exchange of heating water with domestic water. At this time, the heating and zero cold water functions are realized in synchronous operation, thereby avoiding the conflict between the zero cold water function and the heating experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a structural diagram of Example 1 of a dual-purpose furnace of the present invention;

[0056] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the expansion water tank;

[0057] Figure 3 for Figure 2 A longitudinal cross-sectional view of

[0058] Figure 4 for Figure 2 Schematic diagram of the three-dimensional decomposition of

[0059] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure of the middle heat-conducting baffle in another direction;

[0060] Figure 6 This is a schematic structural diagram of Example 2 of a dual-purpose furnace of the present invention;

[0061] Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure of the expansion water tank;

[0062] Figure 8 for Figure 7 A longitudinal cross-sectional view of

[0063] Figure 9 for Figure 7 Schematic diagram of the three-dimensional decomposition of

[0064] Figure 10 for Figure 9 Schematic diagram of the three-dimensional structure of the middle heat-conducting partition in another direction. DETAILED DESCRIPTION

[0065] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0066] Example 1:

[0067] like Figures 1 to 5 FIG. 1 shows a first preferred embodiment of a dual-purpose furnace according to the present invention. The dual-purpose furnace comprises a combustion heat exchange device 1, a heat exchanger 2, a heat exchange pipe 3, a heating water inlet pipe 4a, a heating water outlet pipe 4b, a domestic water inlet pipe 5a, a domestic water outlet pipe 5b, a delivery pump 6, a three-way valve 7, and an expansion tank 8.

[0068] Among them, the combustion heat exchange device 1 includes an inner shell 11, a heat exchanger 12, a burner 13, an outer shell 15, a fan 16 and a wind pressure sensor 17. The heat exchanger 12, the burner 13 and the fan 16 are arranged in the inner shell 11, and the outer shell 15 is arranged outside the inner shell 11. There is an interlayer 151 between the inner wall of the outer shell 15 and the outer wall of the inner shell 11.

[0069] Specifically, the bottom of the inner shell 11 is connected to a gas pipeline 111 for supplying gas to the burner 13. A proportional valve 1111 is installed on the gas pipeline 111 for adjusting the amount of gas. The bottom wall of the inner shell 11 has a plurality of gas supply holes 112 for connecting the inner cavity of the inner shell 11 and the interlayer 151. The top of the inner shell 11 is connected to a smoke exhaust pipe 113 for exhausting smoke.

[0070] The heat exchanger 12 is located in the middle of the inner shell 11 and has a heat exchange channel inside.

[0071] The burner 13 is located at the lower part of the inner shell 11 and is used to supply heat to the heat exchanger 12;

[0072] The top of the housing 15 is connected to an air supply duct 152 for replenishing air. The air supply duct 152 is sleeved around the outer periphery of the smoke exhaust duct 113 with a gap between the two. In this way, the cold air in the air supply duct 152 can fully exchange heat with the high-temperature flue gas in the smoke exhaust duct 113, thereby preheating the cold air and cooling the high-temperature flue gas at the same time.

[0073] The fan 16 is located at the entrance of the smoke exhaust duct 113 and is used to supply air to the burner 13 and exhaust the smoke;

[0074] The wind pressure sensor 17 is installed at the entrance of the smoke exhaust duct 113 to monitor the wind pressure inside the smoke exhaust duct 113 .

[0075] The heat exchanger 2 has a hot water channel and a cold water channel for exchanging heat with each other.

[0076] The heat exchange pipe 3 is a circulation pipe comprising a first heat exchange section 31 and a second heat exchange section 32 connected in sequence. Specifically, a portion of the first heat exchange section 31 passes through the heat exchange channel of the heat exchanger 12, while a portion of the second heat exchange section 32 passes through the hot water channel of the heat exchanger 2. Specifically, a pressure relief valve 311 is provided on the first heat exchange section 31.

[0077] The heating water inlet pipe 4a and the heating water outlet pipe 4b are respectively connected to the inlet end and the outlet end of the first heat exchange section 31, and are respectively used to connect to the two ends of the external heating pipeline.

[0078] The domestic water inlet pipe 5a and the domestic water outlet pipe 5b are respectively connected to the two ends of the cold water channel of the heat exchanger 2. Specifically, a water supply pipe 51 is connected between the domestic water inlet pipe 5a and the heating water inlet pipe 4a. The water supply pipe 51 is installed with a water supply valve 511 for controlling the on-off of the water supply pipe 51.

[0079] The delivery pump 6 is installed on the first heat exchange section 31 and can deliver water from the inlet end of the first heat exchange section 31 to the outlet end of the first heat exchange section 31 .

[0080] The three-way valve 7 has a water inlet end, a first water outlet end and a second water outlet end. The water inlet end of the three-way valve 7 is connected to the outlet end of the first heat exchange section 31, the first water outlet end of the three-way valve 7 is connected to the inlet end of the second heat exchange section 32, and the second water outlet end of the three-way valve 7 is connected to the heating water outlet pipe 4b. By adjusting the three-way valve 7, the on-off of the second heat exchange section 32 and the heating water outlet pipe 4b can be controlled.

[0081] By adjusting the three-way valve 7, the dual-purpose furnace has at least two states:

[0082] In the first state, the second heat exchange section 32 is connected and the heating water outlet pipe 4b is disconnected, so that the heat exchange pipe 3 forms a separate circulation loop, which is the internal circulation mentioned in the background technology;

[0083] In the second state, the second heat exchange section 32 is disconnected and the heating water outlet pipe 4b is connected, so that the heating water inlet pipe 4a, the first heat exchange section 31, the heating water outlet pipe 4b and the external heating pipeline together form a circulation loop, which is the external circulation mentioned in the background technology.

[0084] The expansion water tank 8 includes a tank body 81 , a flexible diaphragm 82 and a heat-conducting partition plate 83 .

[0085] Specifically, the box body 81 includes a pair of left and right covers 810 that are matched and connected;

[0086] The flexible diaphragm 82 is vertically arranged in the box body 81, and its edge is sandwiched between the two covers 810. The flexible diaphragm 82 divides the internal space of the box body 81 into a gas chamber 811 and a liquid chamber 812. The top of the box body 81 has an air filling port 8111 that is connected to the gas chamber 811.

[0087] The heat-conducting partition 83 is vertically arranged in the liquid chamber 812 , dividing the inner cavity of the liquid chamber 812 into a heating water chamber 8121 and a domestic water channel 8122 for heat exchange with each other. The heating water chamber 8121 is separated between the domestic water channel 8122 and the gas chamber 811 . In this embodiment, the water inlet and outlet ends of the heating water chamber 8121 are both located at the lower part of the box body 81 and share the same port, which is connected to the above-mentioned heating water inlet pipe 4a through a pipeline, and is used to accommodate and replenish the expansion and contraction of the circulating water in the circulation loop; the inlet and outlet ends of the domestic water channel 8122 are respectively located at the lower and upper parts of the box body 81, and the above-mentioned domestic water inlet pipe 5a partially passes through the domestic water channel 8122; the surface of the heat-conducting baffle 83 is stamped to form a serpentine groove 831 or a convex bump 832, which can increase the surface area of the heat-conducting baffle 83, thereby improving the heat exchange efficiency of the heating water chamber 8121 and the domestic water channel 8122.

[0088] The working principle of this embodiment 1 is as follows:

[0089] (1) In the heating mode, the dual-purpose furnace is switched to the second state through the three-way valve 7, the second heat exchange section 32 is disconnected, and the heating water outlet pipe 4b is connected, so that the heating water inlet pipe 4a, the first heat exchange section 31, the heating water outlet pipe 4b and the external heating pipeline together form a circulation loop. Under the action of the delivery pump 6, the water in the first heat exchange section 31 of the heat exchange pipe 3 is heated by the combustion heat exchange device 1 and then discharged to the heating water outlet pipe 4b. The hot water flows through each room through the external heating pipeline to dissipate heat, and finally returns to the first heat exchange section 31 through the heating water inlet pipe 4a to supplement heat, thereby achieving continuous heating of each room;

[0090] (2) In the domestic hot water mode, the dual-purpose boiler is switched to the first state through the three-way valve 7, the second heat exchange section 32 is connected, and the heating water outlet pipe 4b is disconnected, so that the heat exchange pipe 3 forms a separate circulation loop. Under the action of the delivery pump 6, the water in the first heat exchange section 31 of the heat exchange pipe 3 is heated by the combustion heat exchange device 1 and then enters the second heat exchange section 32. At the same time, the cold water introduced into the domestic water inlet pipe 5a first passes through the expansion water tank 8 and the heating water in the heating water chamber 8121 to exchange heat, and then passes through the heat exchanger 2 to exchange heat with the hot water in the second heat exchange section 32. After the cold water is heated to become hot water, it is supplied to the user through the domestic water outlet pipe 5b. The water in the second heat exchange section 32 finally returns to the first heat exchange section 31 to replenish heat, thereby realizing a continuous supply of domestic hot water.

[0091] Since there is always a portion of heating water in the heating water chamber 8121 of the expansion water tank 8, when there is a heating demand in winter, the heating water is high-temperature water when the heating function is turned on; when there is no heating demand in summer, when the heating function is turned off, the heating water is not heated and is low-temperature water with a constant temperature. This makes the expansion water tank 8 an ideal water temperature regulating tank. Therefore:

[0092] ① When using domestic hot water in winter, the domestic water temperature is relatively low (usually below 10°C). At this time, the domestic water first flows through the expansion water tank 8. The high-temperature heating water in the expansion water tank 8 can preheat the low-temperature domestic cold water, thereby raising the domestic cold water temperature. In the subsequent self-heating, it can reach the user's set temperature more quickly, avoiding the need for the dual-purpose boiler to release cold water for a long time when using domestic hot water;

[0093] ② When using domestic hot water in summer, the domestic water inlet temperature is relatively high (usually above 30°C). If it is directly heated by the heat exchanger 2, the temperature is very likely to overheat. In the dual-purpose furnace system of this embodiment, the domestic water inlet first flows through the expansion water tank 8. The low-temperature heating water stored in the expansion water tank 8 (the heating water is in the indoor floor heating or heating plate, which is less affected by the external temperature and has a lower temperature) can appropriately lower the domestic water inlet temperature, thereby avoiding the problem of overheating and effectively improving the comfort of bathing in summer.

[0094] The advantages of this solution are:

[0095] First, it improves the user's bathing comfort, with hot water coming out quickly in winter and preventing scalding in summer;

[0096] Second, avoid running cold water for a long time in winter, which will lead to waste of water resources;

[0097] Third, the expansion tank has a simple process, no major changes to its appearance, and no significant impact on the overall layout of the machine;

[0098] Fourth, the structural scheme makes the system stable and highly reliable.

[0099] Example 2:

[0100] like Figures 6 to 10 FIG. 2 shows a second preferred embodiment of a dual-purpose furnace according to the present invention. The dual-purpose furnace includes a combustion heat exchange device 1, a heat exchanger 2, a heat exchange pipe 3, a heating water inlet pipe 4a, a heating water outlet pipe 4b, a domestic water inlet pipe 5a, a domestic water outlet pipe 5b, a domestic water return pipe 5c, a delivery pump 6, a three-way valve 7, and an expansion tank 8.

[0101] Among them, the combustion heat exchange device 1 includes an inner shell 11, a heat exchanger 12, a burner 13, an outer shell 15, a fan 16 and a wind pressure sensor 17. The heat exchanger 12, the burner 13 and the fan 16 are arranged in the inner shell 11, and the outer shell 15 is arranged outside the inner shell 11. There is an interlayer 151 between the inner wall of the outer shell 15 and the outer wall of the inner shell 11.

[0102] Specifically, the bottom of the inner shell 11 is connected to a gas pipeline 111 for supplying gas to the burner 13. A proportional valve 1111 is installed on the gas pipeline 111 for adjusting the amount of gas. The bottom wall of the inner shell 11 has a plurality of gas supply holes 112 for connecting the inner cavity of the inner shell 11 and the interlayer 151. The top of the inner shell 11 is connected to a smoke exhaust pipe 113 for exhausting smoke.

[0103] The heat exchanger 12 is located in the middle of the inner shell 11 and has a heat exchange channel inside.

[0104] The burner 13 is located at the lower part of the inner shell 11 and is used to supply heat to the heat exchanger 12;

[0105] The top of the housing 15 is connected to an air supply duct 152 for replenishing air. The air supply duct 152 is sleeved around the outer periphery of the smoke exhaust duct 113 with a gap between the two. In this way, the cold air in the air supply duct 152 can fully exchange heat with the high-temperature flue gas in the smoke exhaust duct 113, thereby preheating the cold air and cooling the high-temperature flue gas at the same time.

[0106] The fan 16 is located at the entrance of the smoke exhaust duct 113 and is used to supply air to the burner 13 and exhaust the smoke;

[0107] The wind pressure sensor 17 is installed at the entrance of the smoke exhaust duct 113 to monitor the wind pressure inside the smoke exhaust duct 113 .

[0108] The heat exchanger 2 has a hot water channel and a cold water channel for exchanging heat with each other.

[0109] The heat exchange pipe 3 is a circulation pipe comprising a first heat exchange section 31 and a second heat exchange section 32 connected in sequence. Specifically, a portion of the first heat exchange section 31 passes through the heat exchange channel of the heat exchanger 12, while a portion of the second heat exchange section 32 passes through the hot water channel of the heat exchanger 2. Specifically, a pressure relief valve 311 is provided on the first heat exchange section 31.

[0110] The heating water inlet pipe 4a and the heating water outlet pipe 4b are respectively connected to the inlet end and the outlet end of the first heat exchange section 31, and are respectively used to connect to the two ends of the external heating pipeline.

[0111] The domestic water inlet pipe 5a and the domestic water outlet pipe 5b are respectively connected to the two ends of the cold water channel of the heat exchanger 2. Specifically, a water supply pipe 51 is connected between the domestic water inlet pipe 5a and the heating water inlet pipe 4a. The water supply pipe 51 is installed with a water supply valve 511 for controlling the on-off of the water supply pipe 51.

[0112] The two ends of the domestic return water pipe 5c are respectively connected to the domestic water inlet pipe 5a and the domestic water outlet pipe 5b. The domestic return water pipe 5c is provided with a one-way valve 52 that only allows domestic water to be transported from the domestic water outlet pipe 5b to the domestic water inlet pipe 5a, and the domestic water inlet pipe 5a is provided with a circulation pump 53 for transporting domestic water from the domestic water outlet pipe 5b to the domestic water inlet pipe 5a.

[0113] The delivery pump 6 is installed on the first heat exchange section 31 and can deliver water from the inlet end of the first heat exchange section 31 to the outlet end of the first heat exchange section 31 .

[0114] The three-way valve 7 has a water inlet end, a first water outlet end and a second water outlet end. The water inlet end of the three-way valve 7 is connected to the outlet end of the first heat exchange section 31, the first water outlet end of the three-way valve 7 is connected to the inlet end of the second heat exchange section 32, and the second water outlet end of the three-way valve 7 is connected to the heating water outlet pipe 4b. By adjusting the three-way valve 7, the on-off of the second heat exchange section 32 and the heating water outlet pipe 4b can be controlled.

[0115] By adjusting the three-way valve 7, the dual-purpose furnace has at least two states:

[0116] In the first state, the second heat exchange section 32 is connected and the heating water outlet pipe 4b is disconnected, so that the heat exchange pipe 3 forms a separate circulation loop, which is the internal circulation mentioned in the background technology;

[0117] In the second state, the second heat exchange section 32 is disconnected and the heating water outlet pipe 4b is connected, so that the heating water inlet pipe 4a, the first heat exchange section 31, the heating water outlet pipe 4b and the external heating pipeline together form a circulation loop, which is the external circulation mentioned in the background technology.

[0118] The expansion water tank 8 includes a tank body 81 , a flexible diaphragm 82 and a heat-conducting partition plate 83 .

[0119] Specifically, the box body 81 includes a pair of left and right covers 810 that are matched and connected;

[0120] The flexible diaphragm 82 is vertically arranged in the box body 81, and its edge is sandwiched between the two covers 810. The flexible diaphragm 82 divides the internal space of the box body 81 into a gas chamber 811 and a liquid chamber 812. The top of the box body 81 has an air filling port 8111 that is connected to the gas chamber 811.

[0121] The heat-conducting partition 83 is vertically arranged in the liquid chamber 812 , dividing the inner cavity of the liquid chamber 812 into a heating water chamber 8121 and a domestic water channel 8122 for heat exchange with each other. The heating water chamber 8121 is separated between the domestic water channel 8122 and the gas chamber 811 . In this embodiment, the water inlet and outlet ends of the heating water chamber 8121 are both located at the lower part of the box body 81 and share the same port, which is connected to the above-mentioned heating water inlet pipe 4a through a pipeline, and is used to accommodate and replenish the expansion and contraction of the circulating water in the circulation loop; the inlet and outlet ends of the domestic water channel 8122 are respectively located at the lower and upper parts of the box body 81, and the above-mentioned domestic water inlet pipe 5a partially passes through the domestic water channel 8122; the surface of the heat-conducting baffle 83 is stamped to form a serpentine groove 831 or a convex bump 832, which can increase the surface area of the heat-conducting baffle 83, thereby improving the heat exchange efficiency of the heating water chamber 8121 and the domestic water channel 8122.

[0122] The working principle of this embodiment 2 is as follows:

[0123] (1) In the heating mode, the dual-purpose furnace is switched to the second state through the three-way valve 7, the second heat exchange section 32 is disconnected, and the heating water outlet pipe 4b is connected, so that the heating water inlet pipe 4a, the first heat exchange section 31, the heating water outlet pipe 4b and the external heating pipeline together form a circulation loop. Under the action of the delivery pump 6, the water in the first heat exchange section 31 of the heat exchange pipe 3 is heated by the combustion heat exchange device 1 and then discharged to the heating water outlet pipe 4b. The hot water flows through each room through the external heating pipeline to dissipate heat, and finally returns to the first heat exchange section 31 through the heating water inlet pipe 4a to supplement heat, thereby achieving continuous heating of each room;

[0124] During this process, if the zero cold water function is turned on, the circulation pump 53 will transport domestic water from the domestic water outlet pipe 5b to the domestic water inlet pipe 5a for circulation. During this circulation process, the domestic water will flow through the expansion water tank 8 and exchange heat with the heating water in the heating water chamber 8121, so that the domestic water in the pipe is heated to a certain temperature;

[0125] (2) In the domestic hot water mode, the dual-purpose boiler is switched to the first state through the three-way valve 7, the second heat exchange section 32 is connected, and the heating water outlet pipe 4b is disconnected, so that the heat exchange pipe 3 forms a separate circulation loop. Under the action of the delivery pump 6, the water in the first heat exchange section 31 of the heat exchange pipe 3 is heated by the combustion heat exchange device 1 and then enters the second heat exchange section 32. At the same time, the cold water introduced into the domestic water inlet pipe 5a first passes through the expansion water tank 8 and the heating water in the heating water chamber 8121 to exchange heat, and then passes through the heat exchanger 2 to exchange heat with the hot water in the second heat exchange section 32. After the cold water is heated to become hot water, it is supplied to the user through the domestic water outlet pipe 5b. The water in the second heat exchange section 32 finally returns to the first heat exchange section 31 to replenish heat, thereby realizing a continuous supply of domestic hot water.

[0126] If the zero cold water function has been activated in the heating mode before, a portion of hot water will be accumulated in the domestic water inlet pipe 5a. In this way, when the user activates the domestic hot water mode, there is no need to release a portion of cold water and hot water can be directly discharged, achieving zero waiting time for hot water. This function can greatly improve the user's comfort.

[0127] In the dual-purpose boiler system of this embodiment, domestic water can be heated in two places: one is in the heat exchanger 2, and the other is in the expansion water tank 8. When normal domestic hot water is used, domestic water can be heated in two places at the same time, improving heating efficiency. During the heating process, if the zero cold water function is turned on, the three-way valve 7 can always remain in the heating state, and the domestic water channel 8122 of the expansion water tank 8 is used to achieve full-time heat exchange between heating water and domestic water. At this time, the heating and zero cold water functions are synchronized, improving the domestic hot water experience without affecting the user's normal heating, effectively solving the problems of ordinary zero cold water dual-purpose boilers.

[0128] The advantages of this solution are:

[0129] (1) Realize the simultaneous operation of domestic hot water, zero cold water and heating functions, improving the domestic water use experience without affecting heating;

[0130] (2) Avoid running cold water for a long time in winter, which will lead to water waste;

[0131] (3) The expansion tank has a simple process and no major changes to its appearance, which has no significant impact on the overall layout of the machine;

[0132] (4) Pure structural solution, stable system and high reliability.

Claims

1. A dual-purpose furnace comprising A combustion heat exchange device (1) includes a heat exchanger (12) having a heat exchange channel; A heat exchanger (2) having a hot water channel and a cold water channel for exchanging heat with each other; The heat exchange pipe (3) comprises a first heat exchange section (31) and a second heat exchange section (32) connected in sequence, wherein at least a portion of the first heat exchange section (31) passes through the heat exchange channel of the heat exchanger (12), and at least a portion of the second heat exchange section (32) passes through the hot water channel of the heat exchanger (2); A heating water inlet pipe (4a) and a heating water outlet pipe (4b) are respectively connected to the two ends of the first heat exchange section (31), and are respectively used to connect to the two ends of an external heating pipeline; A domestic water inlet pipe (5a) and a domestic water outlet pipe (5b) are respectively connected to both ends of the cold water channel of the heat exchanger (2); a delivery pump (6), installed on the first heat exchange section (31); and The expansion water tank (8) has a heating water chamber (8121) for accommodating and replenishing the expansion and contraction of circulating water in the circulation loop, and the heating water chamber (8121) is connected to the heat exchange pipe (3) or the heating water inlet pipe (4a) through a pipeline; The second heat exchange section (32) and the heating water outlet pipe (4b) are both provided with valves so that the dual-purpose furnace has at least two states: In the first state, the second heat exchange section (32) is connected, and the heating water outlet pipe (4b) is disconnected; In the second state, the second heat exchange section (32) is disconnected, and the heating water outlet pipe (4b) is connected; Its characteristics are: The expansion water tank (8) further comprises a domestic water channel (8122) capable of exchanging heat with the heating water chamber (8121), and at least a portion of the domestic water inlet pipe (5a) passes through the domestic water channel (8122); In the domestic hot water mode, the cold water introduced through the domestic water inlet pipe (5a) first passes through the expansion water tank (8) to exchange heat with the heating water in the heating water chamber (8121), and then passes through the heat exchanger (2) to exchange heat with the hot water in the second heat exchange section (32). After the cold water is heated to become hot water, it is supplied to the user through the domestic water outlet pipe (5b).

2. The dual-purpose furnace according to claim 1, characterized in that: The expansion water tank (8) includes a box body (81) and a flexible diaphragm (82) arranged in the box body (81), wherein the flexible diaphragm (82) divides the internal space of the box body (81) into a gas chamber (811) and a liquid chamber (812), and a heat-conducting partition (83) is installed in the liquid chamber (812), and the heat-conducting partition (83) divides the inner cavity of the liquid chamber (812) into the heating water chamber (8121) and the domestic water channel (8122).

3. The dual-purpose furnace according to claim 2, characterized in that: The inlet and outlet ends of the living water channel (8122) are respectively located at the lower and upper parts of the box body (81).

4. The dual-purpose furnace according to claim 2, characterized in that: The water inlet and outlet of the heating water chamber (8121) are located at the lower part of the box (81) and share the same port, which is connected to the heat exchange pipe (3) or the heating water inlet pipe (4a) through a pipeline.

5. The dual-purpose furnace according to claim 2, characterized in that: The top of the box body (81) is provided with an air filling port (8111) which is in communication with the gas receiving chamber (811).

6. The dual-purpose stove according to claim 2, characterized in that: The surface of the heat-conducting baffle (83) is punched to form grooves (831) or convex bumps (832) arranged in a serpentine shape.

7. The dual-purpose stove according to any one of claims 1 to 6, characterized in that: The second heat exchange section (32) and the heating water outlet pipe (4b) share the same three-way valve (7), which has a water inlet end, a first water outlet end, and a second water outlet end. The water inlet end of the three-way valve (7) is connected to the first heat exchange section (31), the first water outlet end of the three-way valve (7) is connected to the second heat exchange section (32), and the second water outlet end of the three-way valve (7) is connected to the heating water outlet pipe (4b).

8. The dual-purpose stove according to any one of claims 1 to 6, characterized in that: The heat exchange pipe (3) or the heating water inlet pipe (4a) is provided with a pressure relief valve (311).

9. The dual-purpose stove according to any one of claims 1 to 6, characterized in that: A water supply pipe (51) is connected between the domestic water inlet pipe (5a) and the heating water inlet pipe (4a) or the heating water outlet pipe (4b), and a water supply valve (511) for controlling the on-off of the water supply pipe (51) is installed on the water supply pipe (51).

10. The dual-purpose stove according to any one of claims 1 to 6, characterized in that: The combustion heat exchange device (1) further comprises a burner (13) for supplying heat to the heat exchanger (12).

11. A dual-purpose stove comprising A combustion heat exchange device (1) includes a heat exchanger (12) having a heat exchange channel; A heat exchanger (2) having a hot water channel and a cold water channel for exchanging heat with each other; The heat exchange pipe (3) comprises a first heat exchange section (31) and a second heat exchange section (32) connected in sequence, wherein at least a portion of the first heat exchange section (31) passes through the heat exchange channel of the heat exchanger (12), and at least a portion of the second heat exchange section (32) passes through the hot water channel of the heat exchanger (2); A heating water inlet pipe (4a) and a heating water outlet pipe (4b) are respectively connected to the two ends of the first heat exchange section (31), and are respectively used to connect to the two ends of an external heating pipeline; A domestic water inlet pipe (5a) and a domestic water outlet pipe (5b) are respectively connected to both ends of the cold water channel of the heat exchanger (2); A domestic water return pipe (5c), with both ends respectively connected to the domestic water inlet pipe (5a) and the domestic water outlet pipe (5b), and a one-way valve (52) is provided on the domestic water return pipe (5c) for only allowing domestic water to be transported from the domestic water outlet pipe (5b) to the domestic water inlet pipe (5a); a delivery pump (6), installed on the first heat exchange section (31); and The expansion water tank (8) has a heating water chamber (8121) for accommodating and replenishing the expansion and contraction of circulating water in the circulation loop, and the heating water chamber (8121) is connected to the heat exchange pipe (3) or the heating water inlet pipe (4a) through a pipeline; The second heat exchange section (32) and the heating water outlet pipe (4b) are both provided with valves so that the dual-purpose furnace has at least two states: In the first state, the second heat exchange section (32) is connected, and the heating water outlet pipe (4b) is disconnected; In the second state, the second heat exchange section (32) is disconnected, and the heating water outlet pipe (4b) is connected; Its characteristics are: The expansion water tank (8) further comprises a domestic water channel (8122) capable of exchanging heat with the heating water chamber (8121), and at least a portion of the domestic water inlet pipe (5a) passes through the domestic water channel (8122); In the domestic hot water mode, the cold water introduced through the domestic water inlet pipe (5a) first passes through the expansion water tank (8) to exchange heat with the heating water in the heating water chamber (8121), and then passes through the heat exchanger (2) to exchange heat with the hot water in the second heat exchange section (32). After the cold water is heated to become hot water, it is supplied to the user through the domestic water outlet pipe (5b).

12. The dual-purpose stove according to claim 11, characterized in that: The expansion water tank (8) includes a box body (81) and a flexible diaphragm (82) arranged in the box body (81), wherein the flexible diaphragm (82) divides the internal space of the box body (81) into a gas chamber (811) and a liquid chamber (812), and a heat-conducting partition (83) is installed in the liquid chamber (812), and the heat-conducting partition (83) divides the inner cavity of the liquid chamber (812) into the heating water chamber (8121) and the domestic water channel (8122).

13. The dual-purpose stove according to claim 12, characterized in that: The inlet and outlet ends of the living water channel (8122) are respectively located at the lower and upper parts of the box body (81).

14. The dual-purpose stove according to claim 12, characterized in that: The water inlet and outlet of the heating water chamber (8121) are located at the lower part of the box (81) and share the same port, which is connected to the heat exchange pipe (3) or the heating water inlet pipe (4a) through a pipeline.

15. The dual-purpose stove according to claim 12, characterized in that: The top of the box body (81) is provided with an air filling port (8111) which is in communication with the gas receiving chamber (811).

16. The dual-purpose stove according to claim 12, characterized in that: The surface of the heat-conducting baffle (83) is punched to form grooves (831) or convex bumps (832) arranged in a serpentine shape.

17. The dual-purpose stove according to any one of claims 11 to 16, characterized in that: The second heat exchange section (32) and the heating water outlet pipe (4b) share the same three-way valve (7), which has a water inlet end, a first water outlet end, and a second water outlet end. The water inlet end of the three-way valve (7) is connected to the first heat exchange section (31), the first water outlet end of the three-way valve (7) is connected to the second heat exchange section (32), and the second water outlet end of the three-way valve (7) is connected to the heating water outlet pipe (4b).

18. The dual-purpose stove according to any one of claims 11 to 16, characterized in that: The heat exchange pipe (3) or the heating water inlet pipe (4a) is provided with a pressure relief valve (311).

19. The dual-purpose stove according to any one of claims 11 to 16, characterized in that: A water supply pipe (51) is connected between the domestic water inlet pipe (5a) and the heating water inlet pipe (4a) or the heating water outlet pipe (4b), and a water supply valve (511) for controlling the on-off of the water supply pipe (51) is installed on the water supply pipe (51).

20. The dual-purpose stove according to any one of claims 11 to 16, characterized in that: The domestic water inlet pipe (5a), the domestic water outlet pipe (5b) or the domestic water return pipe (5c) is provided with a circulation pump (53) for transporting domestic water from the domestic water outlet pipe (5b) to the domestic water inlet pipe (5a).

Images