A dual-purpose furnace

Abstract

This invention discloses a dual-purpose boiler, 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); and a domestic water inlet pipe (5a) and a domestic water outlet pipe (5b); characterized in that it further comprises a first delivery pump (6) disposed on the heat exchange pipe (3); a second delivery pump (7) disposed on either the heating water inlet pipe (4a) or the heating water outlet pipe (4b); and a first valve (8) having two independent first connecting channels (81) inside; the dual-purpose boiler has at least two states: in the second state, the heating water inlet pipe (4a) and the heating water outlet pipe (4b) are connected through another first connecting channel (81). Compared with the prior art, the dual-purpose boiler of this invention can prevent individual rooms from rapidly cooling down due to excessive heat dissipation in domestic hot water mode.

Description

Technical Field

[0001] This invention relates to the field of heating equipment technology, specifically to a dual-purpose furnace. Background Technology

[0002] Currently, some residential buildings are equipped with underfloor heating or other hydrothermal heating systems. In these buildings, in addition to domestic water supply, an extra water supply is needed to power the corresponding hydrothermal heating equipment. Therefore, ordinary gas water heaters cannot simultaneously supply hot water for domestic use and heating water for the hydrothermal equipment. A dual-purpose boiler is required to supply both hot water for domestic use and heating water for the equipment.

[0003] like Figure 1 As shown, in the existing dual-purpose boiler, the internal circulation and external circulation are switched using a three-way valve 8': In heating mode, the dual-purpose boiler switches to external circulation, and the heat exchange pipe 3' is connected to the heating pipe 4'. Under the action of the circulation pump 6', the water in the heat exchange pipe 3' is heated by the combustion heat exchange device 1' and discharged into the heating pipe 4'. The hot water flows through each room through the external circulation, thereby achieving heating. In domestic hot water mode, the dual-purpose boiler switches to internal circulation, and the heat exchange pipe 3' forms its own circulation loop. Under the action of the circulation pump 6', the hot water exchanges heat with the domestic water pipe 5' when flowing through the heat exchanger 2' through the internal circulation, thereby achieving the supply of domestic hot water. At this time, the heat exchange pipe 3' is not connected to the heating pipe 4', the external circulation is interrupted, the water in the heating pipe 4' is stagnant, and the heating automatically stops until the use of domestic hot water ends. For details on the structure, please refer to the applicant's earlier Chinese invention patent, "A Dual-Purpose Furnace Working System," with patent application number CN201710624991.4 (publication number CN108061375A).

[0004] However, the above solution has the following drawbacks: First, in the domestic hot water mode, the external circulation is interrupted, and some rooms may cool down rapidly due to excessive heat dissipation; Second, the external circulation is a one-way circulation, and the heating pipes are divided into front and back ends. The temperature of the front end rooms is higher, while the temperature of the back end rooms is lower, or even not hot at all. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a dual-purpose boiler that can prevent individual rooms from rapidly cooling down due to excessive heat dissipation in domestic hot water mode, in light of the current state of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a dual-purpose furnace that can provide uniform heating to each room.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a dual-purpose furnace, comprising...

[0008] A combustion heat exchange device with heat exchange channels;

[0009] The heat exchanger has internal hot water channels and cold water channels that exchange heat with each other;

[0010] The heat exchange pipe includes a first heat exchange section and a second heat exchange section connected in sequence. At least part of the first heat exchange section passes through the heat exchange channel of the combustion heat exchange device, and at least part of the second heat exchange section passes through the hot water channel of the heat exchanger.

[0011] The heating inlet pipe and heating outlet pipe are used to connect to both ends of an external heating pipeline, respectively; and

[0012] The domestic water inlet pipe and the domestic water outlet pipe are respectively connected to both ends of the cold water passage of the heat exchanger;

[0013] Its characteristic is that it also includes:

[0014] The first delivery pump is installed on the heat exchange pipeline;

[0015] A second delivery pump is installed on the heating inlet pipe or the heating outlet pipe; and

[0016] The first valve has two independent first connecting channels inside;

[0017] The dual-purpose furnace described above has at least two states:

[0018] In the first state, the heating inlet pipe and the heating outlet pipe are respectively connected to both ends of the heat exchange pipe through two first connecting channels.

[0019] In the second state, the two ends of the heat exchange pipe are connected through one of the first connecting channels, and the heating inlet pipe and the heating outlet pipe are connected through the other of the first connecting channels.

[0020] To further solve the second technical problem mentioned above, the heating inlet pipe or heating outlet pipe includes a first heating section, a second heating section and a third heating section connected in sequence, and the second delivery pump is installed on the second heating section, which can deliver water from the inlet end of the second heating section to the outlet end of the second heating section.

[0021] Furthermore, it also includes

[0022] The second valve has two independent second connecting channels inside;

[0023] The dual-purpose furnace also has at least a third state:

[0024] In the second state, the inlet and outlet ends of the second heating section are respectively connected to the first heating section and the third heating section through two second connecting channels.

[0025] In the third state, the two ends of the heat exchange pipe are connected through one of the first connecting channels, and the heating inlet pipe and the heating outlet pipe are connected through the other of the first connecting channels; the inlet and outlet ends of the second heating section are respectively connected to the third heating section and the first heating section through two of the second connecting channels.

[0026] In order to deliver the heat from the heat exchange pipe to the heating pipe in a timely manner, the inlet end of the second heat exchange section is the inlet end of the heat exchange pipe, the outlet end of the second heat exchange section is connected to the inlet end of the first heat exchange section, and the outlet end of the first heat exchange section is the outlet end of the heat exchange pipe.

[0027] In order to continuously deliver circulating water to the heat exchange channel for heat exchange, the first delivery pump is installed on the first heat exchange section and located upstream of the heat exchange channel, and can deliver water from the inlet end of the first heat exchange section to the outlet end of the first heat exchange section.

[0028] To facilitate the drainage of water in the heating pipes, a drainage pipe is connected to the heating inlet or outlet pipe, and a drainage valve is installed on the drainage pipe to control the opening and closing of the drainage pipe.

[0029] 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 to control the opening and closing of the water supply pipe.

[0030] In order to supply heat to the heat exchange channel, the combustion heat exchange device also has a burner for supplying heat to the heat exchange channel, which is connected to a gas pipeline.

[0031] To facilitate the adjustment of combustion intensity, a proportional valve for adjusting the amount of gas is installed on the gas pipeline.

[0032] To facilitate complete combustion of the gas, the combustion heat exchange device also includes a fan for supplying air to the burner and discharging flue gas.

[0033] To facilitate the containment and replenishment of the expansion and contraction of the circulating water, an expansion tank is connected to the heat exchange pipe for containing and replenishing the expansion and contraction of the circulating water in the circulation loop.

[0034] Compared with the prior art, the advantages of the present invention are as follows:

[0035] (1) By adjusting the first valve, the dual-purpose boiler is switched to the first state or the second state. In the domestic hot water mode, the two ends of the heat exchange pipe are connected through one of the first connecting channels to form an internal circulation to achieve a continuous supply of domestic hot water. In addition, the heating inlet pipe and the heating outlet pipe are connected through another first connecting channel so that the heating inlet pipe, the heating outlet pipe and the external heating pipe form a circulation loop together. In this way, under the action of the second delivery pump, hot water can still flow through the external heating pipe to dissipate heat in each room. Although the external circulation is interrupted due to the lack of connection with the heat exchange pipe, and new heat cannot be replenished through the combustion heat exchange device, the water in the heating pipe is running water at this time, which can prevent individual rooms from cooling down rapidly due to excessive heat dissipation in the domestic hot water mode.

[0036] (2) The dual-purpose boiler is switched between the second and third states by the second valve so that the clockwise circulation loop and the counterclockwise circulation loop alternate, so that the external heating pipes dissipate heat evenly, thereby providing uniform heating to each room. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of an existing dual-purpose furnace in the background art;

[0038] Figure 2 This is a schematic diagram of the structure of the dual-purpose furnace of the present invention in its first state (arrows indicate the direction of water flow);

[0039] Figure 3 for Figure 2 A schematic diagram of the structure of the dual-purpose boiler after switching to the second state (arrows indicate the direction of water flow);

[0040] Figure 4 for Figure 3 A schematic diagram of the structure of the dual-purpose boiler after switching to the third state (arrows indicate the direction of water flow). Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0042] like Figures 2 to 4 The image shows a preferred embodiment of the dual-purpose furnace of 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 first delivery pump 6, a second delivery pump 7, a first valve 8, and a second valve 9.

[0043] The combustion heat exchange device 1 includes a heat exchange channel 11, a burner 12 for supplying heat to the heat exchange channel 11, and a fan 13 for supplying air to the burner 12 and exhausting flue gas. Specifically, the burner 12 is connected to a gas pipeline 121, on which a proportional valve 1211 for adjusting the amount of gas is installed.

[0044] The heat exchanger 2 has a hot water channel 21 and a cold water channel 22 that exchange heat with each other.

[0045] The heat exchange pipe 3 includes a first heat exchange section 31 and a second heat exchange section 32 connected in sequence. Specifically, the inlet end of the second heat exchange section 32 is the inlet end of the heat exchange pipe 3, the outlet end of the second heat exchange section 32 is connected to the inlet end of the first heat exchange section 31, and the outlet end of the first heat exchange section 31 is the outlet end of the heat exchange pipe 3; part of the first heat exchange section 31 passes through the heat exchange channel 11 of the combustion heat exchange device 1, and part of the second heat exchange section 32 passes through the hot water channel 21 of the heat exchanger 2; an expansion tank 33 for containing and replenishing the expansion and contraction of the circulating water in the circulation loop is connected to the first heat exchange section 31.

[0046] The heating inlet pipe 4a and the heating outlet pipe 4b are respectively used to connect to both ends of an external heating pipeline. Specifically, the heating outlet pipe 4b includes a first heating section 41, a second heating section 42, and a third heating section 43 connected in sequence; a drain pipe 44 is connected to the heating inlet pipe 4a, and a drain valve 441 for controlling the opening and closing of the drain pipe 44 is installed on the drain pipe 44.

[0047] 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 22 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, and a water supply valve 511 for controlling the opening and closing of the water supply pipe 51 is installed on the water supply pipe 51.

[0048] The first delivery pump 6 is installed on the first heat exchange section 31 of the heat exchange pipe 3 and is located upstream of the heat exchange channel 11. It 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.

[0049] The second delivery pump 7 is installed on the second heating section 42 of the heating outlet pipe 4b, and can deliver water from the inlet end of the second heating section 42 to the outlet end of the second heating section 42.

[0050] The first valve 8 has two independent first connecting channels 81 inside.

[0051] The second valve 9 has two independent second connecting channels 91 inside.

[0052] By adjusting the first valve 8 and the second valve 9, the dual-purpose furnace can have at least three states:

[0053] In the first state, such as Figure 2 As shown, the heating inlet pipe 4a is connected to the inlet end of the heat exchange pipe 3 through one of the first connecting channels 81, and the heating outlet pipe 4b is connected to the outlet end of the heat exchange pipe 3 through another first connecting channel 81, so that the heating inlet pipe 4a, the heat exchange pipe 3, the heating outlet pipe 4b and the external heating pipe together form a circulation loop, that is, the external circulation mentioned in the background art.

[0054] In the second state, such as Figure 3 As shown, the inlet and outlet ends of the heat exchange pipe 3 are connected through one of the first connecting channels 81, so that the heat exchange pipe 3 forms a separate circulation loop, i.e., the internal circulation mentioned in the background art; the first heating section 41 of the heating inlet pipe 4a and the heating outlet pipe 4b is connected through another first connecting channel 81, and the inlet and outlet ends of the second heating section 42 are connected to the first heating section 41 and the third heating section 43 through two second connecting channels 91, so that the heating inlet pipe 4a, the heating outlet pipe 4b and the external heating pipes together form a clockwise circulation loop;

[0055] In the third state, such as Figure 4 As shown, the inlet and outlet ends of the heat exchange pipe 3 are connected through one of the first connecting channels 81, so that the heat exchange pipe 3 forms a separate circulation loop, i.e., the internal circulation mentioned in the background art; the first heating section 41 of the heating inlet pipe 4a and the heating outlet pipe 4b is connected through another first connecting channel 81, and the inlet and outlet ends of the second heating section 42 are connected to the third heating section 43 and the first heating section 41 through two second connecting channels 91, so that the heating inlet pipe 4a, the heating outlet pipe 4b and the external heating pipeline together form a counterclockwise circulation loop.

[0056] The working principle of this embodiment is as follows:

[0057] (1) In heating mode, the dual-purpose boiler is switched to the following mode via the first valve 8: Figure 2 In the first state shown, the heating inlet pipe 4a is connected to the inlet end of the heat exchange pipe 3 through one of the first connecting channels 81, and the heating outlet pipe 4b is connected to the outlet end of the heat exchange pipe 3 through another first connecting channel 81, so that the heating inlet pipe 4a, the heat exchange pipe 3, the heating outlet pipe 4b and the external heating pipeline together form a circulation loop. Under the action of the first delivery pump 6, the water in the heat exchange pipe 3 is heated by the combustion heat exchange device 1 and then discharged to the heating outlet pipe 4b. The hot water flows through each room to dissipate heat through the external heating pipeline, and finally returns to the heat exchange pipe 3 through the heating inlet pipe 4a to replenish the heat, thereby achieving continuous heating for each room.

[0058] (2) In domestic hot water mode, the dual-purpose boiler is switched to the following mode via the first valve 8: Figure 3 The second state shown or as Figure 4 In the third state shown, the inlet and outlet ends of the heat exchange pipe 3 are connected through one of the first connecting channels 81, so that the heat exchange pipe 3 forms a separate circulation loop. Under the action of the first 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. When the hot water in the second heat exchange section 32 passes through the heat exchanger 2, it exchanges heat with the cold water introduced by the domestic water inlet pipe 5a. After the cold water is heated into 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 the heat, thereby realizing the continuous supply of domestic hot water.

[0059] At the same time, the heating inlet pipe 4a and the heating outlet pipe 4b are connected through another first connecting channel 81, so that the heating inlet pipe 4a, the heating outlet pipe 4b and the external heating pipes form a circulation loop. In this way, under the action of the second delivery pump 7, hot water can still flow through each room to dissipate heat through the external heating pipes. Although the external circulation is interrupted due to the lack of connection with the heat exchange pipe 3, and new heat cannot be replenished through the combustion heat exchange device 1, the water in the heating pipes is running water at this time, which can prevent individual rooms from cooling down rapidly due to excessive heat dissipation in the domestic hot water mode.

[0060] It is worth noting that in this mode, the dual-purpose boiler can be switched between the second and third states via the second valve 9, so that the clockwise and counterclockwise circulation loops alternate, which is equivalent to the heating inlet pipe 4a and the heating outlet pipe 4b being swapped, so that the external heating pipes can dissipate heat evenly, thereby providing uniform heating to each room and preventing any room from being cold.

Claims

1. A dual-purpose stove, comprising: Combustion heat exchange device (1) has heat exchange channel (11); The heat exchanger (2) has a hot water channel (21) and a cold water channel (22) for mutual heat exchange. The heat exchange pipe (3) includes a first heat exchange section (31) and a second heat exchange section (32) connected in sequence. The first heat exchange section (31) passes through the heat exchange channel (11) of the combustion heat exchange device (1) in at least part, and the second heat exchange section (32) passes through the hot water channel (21) of the heat exchanger (2) in at least part. The heating inlet pipe (4a) and heating outlet pipe (4b) are respectively used to connect to both ends of an external heating pipeline; and The domestic water inlet pipe (5a) and the domestic water outlet pipe (5b) are respectively connected to both ends of the cold water channel (22) of the heat exchanger (2); Its features are: It also includes The first delivery pump (6) is installed on the heat exchange pipe (3); A second delivery pump (7) is installed on the heating inlet pipe (4a) or the heating outlet pipe (4b); and The first valve (8) has two independent first connecting channels (81) inside; The dual-purpose furnace described above has at least two states: In the first state, the heating inlet pipe (4a) and heating outlet pipe (4b) are respectively connected to both ends of the heat exchange pipe (3) through two first connecting channels (81); In the second state, the two ends of the heat exchange pipe (3) are connected through one of the first connecting channels (81), and the heating water inlet pipe (4a) and the heating water outlet pipe (4b) are connected through the other of the first connecting channels (81).

2. The dual-purpose furnace according to claim 1, characterized in that: The heating inlet pipe (4a) or heating outlet pipe (4b) includes a first heating section (41), a second heating section (42) and a third heating section (43) connected in sequence. The second delivery pump (7) is installed on the second heating section (42) and can deliver water from the inlet end of the second heating section (42) to the outlet end of the second heating section (42). Furthermore, it also includes The second valve (9) has two independent second connecting channels (91) inside; The dual-purpose furnace also has at least a third state: In the second state, the inlet and outlet ends of the second heating section (42) are connected to the first heating section (41) and the third heating section (43) respectively through two second connecting channels (91); In the third state, the two ends of the heat exchange pipe (3) are connected through one of the first connecting channels (81), and the heating inlet pipe (4a) and heating outlet pipe (4b) are connected through the other first connecting channel (81); the inlet and outlet ends of the second heating section (42) are connected to the third heating section (43) and the first heating section (41) through two second connecting channels (91) respectively.

3. The dual-purpose furnace according to claim 1, characterized in that: The inlet end of the second heat exchange section (32) is the inlet end of the heat exchange pipe (3), the outlet end of the second heat exchange section (32) is connected to the inlet end of the first heat exchange section (31), and the outlet end of the first heat exchange section (31) is the outlet end of the heat exchange pipe (3).

4. The dual-purpose furnace according to claim 1, characterized in that: The first delivery pump (6) is installed on the first heat exchange section (31) and located upstream of the heat exchange channel (11), and is able to deliver water from the inlet end of the first heat exchange section (31) to the outlet end of the first heat exchange section (31).

5. The dual-purpose furnace according to any one of claims 1 to 4, characterized in that: A drain pipe (44) is connected to the heating inlet pipe (4a) or heating outlet pipe (4b), and a drain valve (441) for controlling the opening and closing of the drain pipe (44) is installed on the drain pipe (44).

6. The dual-purpose furnace according to any one of claims 1 to 4, 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 opening and closing of the water supply pipe (51) is installed on the water supply pipe (51).

7. The dual-purpose furnace according to any one of claims 1 to 4, characterized in that: The combustion heat exchange device (1) also has a burner (12) for supplying heat to the heat exchange channel (11), which is connected to a gas pipeline (121).

8. The dual-purpose furnace according to claim 7, characterized in that: The gas pipeline (121) is equipped with a proportional valve (1211) for adjusting the amount of gas.

9. The dual-purpose furnace according to claim 7, characterized in that: The combustion heat exchange device (1) also has a fan (13) for supplying air to the burner (12) and for exhausting flue gas.

10. The dual-purpose furnace according to any one of claims 1 to 4, characterized in that: The heat exchange pipe (3) is connected to an expansion tank (33) for containing and replenishing the expansion and contraction of the circulating water in the circulation loop.

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