Gas wall-hung boiler

Abstract

The utility model relates to a heating equipment technical field especially is related to a kind of gas wall-hung boiler.A kind of gas wall-hung boiler, including shell, heat pump and main heat exchanger in shell, heat pump includes compressor, condenser and first evaporator, condenser has refrigerant passage and hot water passage, compressor, refrigerant passage and first evaporator are communicated to form refrigerant circulation flow path;Hot water passage's water outlet is communicated with the water inlet of main heat exchanger, along the front-back direction of shell, the orthographic projection of first evaporator and the orthographic projection of main heat exchanger at least partially coincide.The utility model in along the front-back direction of shell, because the orthographic projection of first evaporator and the orthographic projection of main heat exchanger at least partially coincide setting, so main heat exchanger when heat exchange, part of heat radiated to outside can be directly radiated to first evaporator, so that the refrigerant in first evaporator absorbs this part of heat and then returns to compressor, effectively improve the energy utilization of this gas wall-hung boiler.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment technology, and in particular to a gas-fired wall-hung boiler. Background Technology

[0002] A gas-fired wall-hung boiler is a device that uses gas as its primary energy source to provide domestic hot water and heating. Its advantages include rapid heating, independence from external temperature fluctuations, and a stable supply of high-temperature hot water. However, its operation relies on gas, resulting in relatively high operating costs. Therefore, a wall-hung boiler integrating a heat pump system has emerged. This system combines the technologies of both wall-hung boilers and heat pumps, leveraging their complementary advantages. It can automatically switch energy sources (gas / electricity) according to different operating conditions, achieving highly efficient and energy-saving solutions for heating or providing hot water for various scenarios. Specifically, the heat pump's condenser is located inside the water tank. When the heat pump is working, the condenser generates heat to heat the water in the tank to meet heating or bathroom needs. The wall-hung boiler, on the other hand, heats the water in the main heat exchanger through combustion generated by the burner to meet heating or bathroom needs. During the heating process in the main heat exchanger, the heat radiated from it is directly lost to the external environment, resulting in low energy utilization. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a gas-fired wall-hung boiler that effectively improves the energy utilization rate of existing integrated heat pump system wall-hung boilers.

[0004] The above-mentioned technical problems are solved by the following technical solutions: A gas-fired wall-hung boiler includes a shell, a heat pump disposed in the shell, and a main heat exchanger. The heat pump includes a compressor, a condenser, and a first evaporator. The condenser has a refrigerant passage and a hot water passage. The compressor, the refrigerant passage, and the first evaporator are connected to form a refrigerant circulation path. The outlet of the hot water passage is connected to the inlet of the main heat exchanger. Along the front-rear direction of the shell, the orthographic projection of the first evaporator and the orthographic projection of the main heat exchanger at least partially coincide.

[0005] Compared with the prior art, the gas-fired wall-hung boiler of this utility model has the following beneficial effects: After being compressed, the refrigerant in the compressor enters the refrigerant channel of the condenser. The high-temperature refrigerant in the refrigerant channel preheats the water entering the hot water channel of the condenser. The preheated water enters the main heat exchanger and is reheated by the heat generated by the combustion of gas in the burner before being supplied to the user. Since the water in the main heat exchanger is preheated by the refrigerant in the condenser, the time it takes for the main heat exchanger to heat the water to the predetermined temperature is shortened, thus improving the heating efficiency. Furthermore, along the front-back direction of the shell, since the orthographic projection of the first evaporator and the orthographic projection of the main heat exchanger at least partially overlap, some of the heat radiated outward by the main heat exchanger during heat exchange can be directly radiated to the first evaporator. The refrigerant in the first evaporator absorbs this heat and then returns to the compressor for compression before re-entering the refrigerant channel of the condenser. In other words, it indirectly utilizes some of the heat radiated outward by the main heat exchanger during heat exchange to preheat the water before it enters the main heat exchanger, effectively improving the energy utilization rate of the gas-fired wall-hung boiler.

[0006] In one embodiment, the projected area of ​​the main heat exchanger is smaller than the projected area of ​​the first evaporator along the front-rear direction of the casing.

[0007] In one embodiment, along the front-rear direction of the casing, the center of the orthographic projection of the main heat exchanger is located above the center of the orthographic projection of the first evaporator.

[0008] In one embodiment, the first evaporator is located between the back plate of the shell and the main heat exchanger along the front-rear direction of the shell.

[0009] In one embodiment, a premixer is also included, with an air inlet on the housing, and a first evaporator disposed in the air passage between the air inlet and the premixer inlet.

[0010] In one embodiment, the heat pump includes a smoke collection shell and a second evaporator disposed within the smoke collection shell. The smoke inlet of the smoke collection shell is connected to the smoke outlet of the main heat exchanger. The refrigerant inlet of the second evaporator is connected to the refrigerant outlet of the first evaporator, and the refrigerant outlet of the second evaporator is connected to the refrigerant inlet of the compressor.

[0011] In one embodiment, a first temperature detector is provided at the inlet of the hot water channel of the condenser, a second temperature detector is provided between the first evaporator and the air inlet, and a third temperature detector is provided between the inlet of the flue gas collection shell and the outlet of the main heat exchanger.

[0012] In one embodiment, the compressor and condenser are both located below the first evaporator along the vertical direction of the housing.

[0013] In one embodiment, a bathroom heat exchanger is also included, which has a bathroom water channel and a heating water channel; the inlet of the heating water channel is connected to the outlet of the main heat exchanger, and the outlet of the heating water channel is connected to the inlet of the hot water channel of the condenser.

[0014] In one embodiment, the bathroom heat exchanger is located below the main heat exchanger along the vertical direction of the housing. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram illustrating the working principle of the gas-fired wall-hung boiler according to an embodiment of the present invention; Figure 2 This is a side view of the gas-fired wall-hung boiler according to an embodiment of the present invention after the casing has been removed; Figure 3 for Figure 2 A partial sectional view.

[0017] Explanation of reference numerals in the attached figures: 1. Shell; 100. Back plate; 2. Compressor; 3. Condenser; 4. First evaporator; 5. Premixer; 6. Main heat exchanger; 7. Burner; 8. Air inlet; 9. Second evaporator; 10. First temperature detector; 11. Second temperature detector; 12. Third temperature detector; 13. Bathroom heat exchanger; 14. Smoke collection shell; 15. Heating return water pipe; 16. Heating outlet water pipe. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Since the operation of wall-hung boilers is not affected by ambient temperature, but their efficiency is limited, while heat pumps have high energy efficiency and can absorb heat from the air, but are limited by ambient temperature, combining the two into an integrated structural design can achieve complementary advantages to a certain extent.

[0023] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0024] According to an embodiment of the present invention, a gas-fired wall-hung boiler is provided, comprising a shell 1, a heat pump disposed in the shell 1, and a main heat exchanger 6; the heat pump includes a compressor 2, a condenser 3, and a first evaporator 4, the condenser 3 having a refrigerant channel and a hot water channel, the compressor 2, the refrigerant channel, and the first evaporator 4 being connected to form a refrigerant circulation path; the outlet of the hot water channel is connected to the inlet of the main heat exchanger 6, and along the front-rear direction of the shell 1, the orthographic projection of the first evaporator 4 at least partially overlaps with the orthographic projection of the main heat exchanger 6.

[0025] The casing 1 is typically rectangular to house the boiler body and heat pump. The boiler body includes a premixer 5, a burner 7, and a main heat exchanger 6 connected in sequence. The heat pump includes a compressor 2, a condenser 3, a throttling valve, and a first evaporator 4 connected in sequence. During boiler operation, heating return water enters the condenser 3 from the heating return water pipe 15. The heat pump utilizes the circulation of refrigerant in the compressor 2, condenser 3, throttling valve, and first evaporator 4 to continuously absorb heat radiated to the air by the main heat exchanger 6 and release this heat to heat the heating return water flowing into the condenser 3. The heating return water then enters the main heat exchanger 6 under the power of the pump. Air and gas are mixed in the premixer 5 and then burned in the burner. The heat generated by combustion further heats the warm water entering the main heat exchanger 6. The heated hot water can then flow out through the heating outlet pipe 16 to meet the heating needs of the user's room.

[0026] The first evaporator 4 is typically a coiled tube formed by pipe bends. Its orthographic projection refers to the side of the first evaporator 4 facing the user's room, i.e., the side with the largest heat exchange area in a plane, which is the plane with multiple pipe sections arranged in parallel. The main heat exchanger 6 is typically cylindrical, so its orthographic projection also faces the user's room, i.e., the disc surface. A mounting plate is provided inside the casing 1. The first evaporator 4 and the main heat exchanger 6 are symmetrically fixed on opposite sides of the mounting plate, specifically using screws or other fasteners for installation and fixation. In this embodiment, the first evaporator 4 and the main heat exchanger 6 are arranged along the front-rear direction of the casing 1. Since the projected area of ​​the main heat exchanger 6 along the front-rear direction of the casing 1 is typically smaller than the projected area of ​​the first evaporator 4 in that direction, the orthographic projections of the first evaporator 4 and the main heat exchanger 6 at least partially coincide in the front-rear direction.

[0027] The refrigerant in compressor 2 is compressed and then enters the refrigerant channel of condenser 3. The high-temperature refrigerant in the refrigerant channel preheats the water entering the hot water channel of condenser 3. The preheated water enters the main heat exchanger 6, where it is reheated by the heat generated by the combustion of gas in burner 7 before being supplied to the user. Because the water in the main heat exchanger 6 is preheated by the refrigerant in condenser 3, the time it takes for the main heat exchanger 6 to heat the water to the predetermined temperature is shortened, thus improving heating efficiency. Furthermore, along the front-back direction of the casing 1, since the orthographic projection of the first evaporator 4 at least partially overlaps with the orthographic projection of the main heat exchanger 6, some of the heat radiated to the outside by the main heat exchanger 6 during heat exchange can be directly radiated to the first evaporator 4. The refrigerant in the first evaporator 4 absorbs this heat and then returns to the compressor 2 for compression before re-entering the refrigerant channel of the condenser. In other words, the heat radiated to the outside by the main heat exchanger during heat exchange is indirectly utilized to preheat the water before it enters the main heat exchanger, effectively improving the energy utilization rate of the gas wall-hung boiler.

[0028] In one embodiment, along the front-rear direction of the casing 1, the projected area of ​​the main heat exchanger 6 is smaller than the projected area of ​​the first evaporator 4.

[0029] like Figure 2 As shown, since the main heat exchanger 6 is smaller in volume than the first evaporator 4, in order to make full use of the heat radiated outward by the main heat exchanger 6 during heat exchange, in this embodiment, the main heat exchange surface of the main heat exchanger 6 is arranged to correspond to the main heat exchange surface of the first evaporator 4, that is, the side with the largest heat exchange area is arranged opposite each other, so as to ensure that the heat radiated outward by the main heat exchanger 6, including the heat radiated by the side wall, is transferred to the main heat exchange surface of the first evaporator 4 to the greatest extent, thereby further improving the energy utilization rate of the gas wall-hung boiler.

[0030] In one embodiment, along the front-rear direction of the casing 1, the center of the orthographic projection of the main heat exchanger 6 is located above the center of the orthographic projection of the first evaporator 4.

[0031] The main heat exchanger 6 is positioned as close as possible to the top of the first evaporator 4. This is because the main heat exchanger 6 is also connected to the burner 7, premixer 5, etc., and these components occupy a certain space in the shell 1. Thus, the above-mentioned components can be installed in the lower space corresponding to the first evaporator 4, making the structure of the entire device more compact.

[0032] In one embodiment, along the front-rear direction of the housing 1, the first evaporator 4 is located between the back plate 100 of the housing 1 and the main heat exchanger 6.

[0033] like Figure 2 As shown, for ease of installation, the first evaporator 4 is positioned between the back plate 100 of the casing 1 and the main heat exchanger 6. This also facilitates the assembly of other components and minimizes the overall space occupied by the device. A mounting plate with mounting holes is provided inside the casing 1. The first evaporator 4 and the main heat exchanger 6 are fastened to these mounting holes with screws or similar fasteners. To ensure efficient heat transfer, the mounting plate can be made of metal, such as aluminum.

[0034] In an embodiment not shown, the first evaporator 4 is located in front of the main heat exchanger 6 along the front-rear direction of the housing 1. Alternatively, the first evaporator 4 may extend to surround the side of the main heat exchanger 6, forming a semi-enclosed structure to maximize the reception of heat radiated outward from the main heat exchanger 6.

[0035] In one embodiment, a premixer 5 is also included, with an air inlet 8 on the housing 1 and a first evaporator 4 disposed in the air passage between the air inlet 8 and the air inlet of the premixer 5.

[0036] In this embodiment, the air inlet 8 is located on the top wall of the housing 1, and the first evaporator 4 is located in the air passage formed by the mounting plate and the side wall of the housing 1. After the air enters through the air inlet 8, it exchanges heat with the refrigerant inside the first evaporator 4, and the air that has absorbed the heat directly enters the premixer 5.

[0037] Before entering the premixer 5 and being ignited by the gas, the air passes through the first evaporator 4 and exchanges heat with it. The refrigerant in the first evaporator 4 absorbs the heat from the air and then enters the compressor 2 to be compressed, which improves the energy utilization rate of the gas wall-hung boiler.

[0038] In one embodiment, the heat pump includes a smoke collection housing 14 and a second evaporator 9 disposed within the smoke collection housing 14. The smoke inlet of the smoke collection housing 14 is connected to the smoke outlet of the main heat exchanger 6. The refrigerant inlet of the second evaporator 9 is connected to the refrigerant outlet of the first evaporator 4, and the refrigerant outlet of the second evaporator 9 is connected to the refrigerant inlet of the compressor 2.

[0039] In this embodiment, the second evaporator 9 is a latent heat recovery unit, located above the main heat exchanger 6. The inlet of the flue gas collection shell is connected to the outlet of the main heat exchanger 6. The flue gas generated after fuel combustion directly enters the flue gas collection shell 14. The refrigerant that has absorbed heat from the air in the first evaporator 4 enters the second evaporator 9 to continue absorbing heat from the flue gas generated by the combustion of the gas. Then it returns to the compressor 2 for further compression. This not only recovers the waste heat of the flue gas but also further improves the energy utilization rate of the gas wall-hung boiler.

[0040] In one embodiment, a first temperature detector 10 is provided at the inlet of the hot water channel of the condenser 3, a second temperature detector 11 is provided between the first evaporator 4 and the air inlet 8, and a third temperature detector 12 is provided between the inlet of the smoke collection shell and the outlet of the main heat exchanger 6.

[0041] The first temperature detector 10, the second temperature detector 11, and the third temperature detector 12 are all temperature probes. The first temperature detector 10 detects the water temperature in the hot water channel entering the condenser 3 in real time, the second temperature detector 11 detects the gas temperature at the air inlet 8 in real time, and the third temperature detector 12 detects the flue gas temperature entering the flue gas collection shell in real time. By adjusting the corresponding water or gas temperatures, the heat pump is ensured to operate at a higher COP value. Specifically, the first temperature detector 10, the second temperature detector 11, and the third temperature detector 12 are all connected to a controller. The controller adjusts the water inlet flow rate or the inlet flow rate of air and gas according to the detected real-time water and gas temperatures to achieve the expected requirements.

[0042] In one embodiment, along the vertical direction of the housing 1, both the compressor 2 and the condenser 3 are located below the first evaporator 4.

[0043] like Figure 2 As shown, there are many pipes below the main heat exchanger 6, including heating return water pipes connected to the condenser 3, heating outlet water pipes connected to the main heat exchanger 6, refrigerant inlet and outlet pipes connected to the compressor 2, and gas pipes, etc. These numerous pipes occupy a large amount of space. In this embodiment, the compressor 2 and condenser 3 are located below the first evaporator 4, i.e., behind the pipes, making the component distribution of the entire device more reasonable and minimizing the vertical space occupied by the device. This is because other functional components are usually installed below the gas wall-hung boiler, maximizing space utilization.

[0044] In one embodiment, a bathroom heat exchanger 13 is also included, which has a bathroom water channel and a heating water channel; the inlet of the heating water channel is connected to the outlet of the main heat exchanger 6, and the outlet of the heating water channel is connected to the inlet of the hot water channel of the condenser 3.

[0045] The bathroom heat exchanger 13 is connected to a bathroom inlet pipe and a bathroom outlet pipe. Hot water output from the main heat exchanger 6 can directly enter the bathroom heat exchanger 13 to heat the cold water input through the bathroom inlet pipe. The heated water is then output through the bathroom outlet pipe for direct use. Cooled cold water flows out through the outlet of the heating water channel, mixes with the hot water output from the hot water channel of the condenser 3, and is then returned to the main heat exchanger 6. To ensure ease of use, a fourth temperature detector can be installed on the bathroom outlet pipe of the bathroom heat exchanger 13, and a fifth temperature detector can be installed on the heating outlet pipe. Both the fourth and fifth temperature detectors can be temperature probes to monitor the outlet water temperature in real time.

[0046] In one embodiment, the bathroom heat exchanger 13 is located below the main heat exchanger 6 along the vertical direction of the housing 1.

[0047] The bathroom heat exchanger 13 is located directly below the main heat exchanger 6 to reserve space for the arrangement of pipes.

[0048] In one embodiment, a fan is provided between the premixer 5 and the burner 7.

[0049] After the air and fuel gas are mixed in the premixer 5, they enter the burner 7 for combustion under the action of the fan, which improves the combustion efficiency.

[0050] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0051] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A gas-fired boiler, characterized in that: The device includes a housing (1), a heat pump and a main heat exchanger (6) disposed in the housing (1); the heat pump includes a compressor (2), a condenser (3) and a first evaporator (4), the condenser (3) has a refrigerant channel and a hot water channel, the compressor (2), the refrigerant channel and the first evaporator (4) are connected to form a refrigerant circulation path; the outlet of the hot water channel is connected to the inlet of the main heat exchanger (6), and along the front and rear direction of the housing (1), the orthographic projection of the first evaporator (4) and the orthographic projection of the main heat exchanger (6) at least partially coincide.

2. The gas-fired wall-hung boiler according to claim 1, characterized in that: Along the front-rear direction of the shell (1), the projected area of ​​the main heat exchanger (6) is smaller than the projected area of ​​the first evaporator (4).

3. The gas-fired wall-hung boiler according to claim 1, characterized in that: Along the front-rear direction of the shell (1), the center of the orthographic projection of the main heat exchanger (6) is located above the center of the orthographic projection of the first evaporator (4).

4. The gas-fired boiler of claim 1, wherein: Along the front-rear direction of the housing (1), the first evaporator (4) is located between the back plate (100) of the housing (1) and the main heat exchanger (6).

5. The gas-fired wall-hung boiler according to any one of claims 1 to 4, characterized in that: It also includes a premixer (5), and the housing (1) is provided with an air inlet (8). The first evaporator (4) is located in the air passage between the air inlet (8) and the air inlet of the premixer (5).

6. The gas-fired wall-hung boiler according to claim 5, characterized in that: The heat pump includes a smoke collection housing (14) and a second evaporator (9) disposed in the smoke collection housing (14). The smoke inlet of the smoke collection housing (14) is connected to the smoke outlet of the main heat exchanger (6). The refrigerant inlet of the second evaporator (9) is connected to the refrigerant outlet of the first evaporator (4), and the refrigerant outlet of the second evaporator (9) is connected to the refrigerant inlet of the compressor (2).

7. The gas-fired boiler of claim 6, characterized in that: The inlet of the hot water channel of the condenser (3) is provided with a first temperature detector (10), the first evaporator (4) is provided with a second temperature detector (11) between the air inlet (8), and the smoke inlet of the smoke collection shell (14) is provided with a third temperature detector (12) between the smoke outlet of the main heat exchanger (6).

8. The gas-fired boiler of any one of claims 1 to 4, characterized in that: Along the vertical direction of the housing (1), the compressor (2) and the condenser (3) are both located below the first evaporator (4).

9. The gas-fired wall-hung boiler according to any one of claims 1 to 4, characterized in that: It also includes a bathroom heat exchanger (13), which has a bathroom water channel and a heating water channel; the inlet of the heating water channel is connected to the outlet of the main heat exchanger (6), and the outlet of the heating water channel is connected to the inlet of the hot water channel of the condenser (3).

10. The gas-fired wall-hung boiler according to claim 9, characterized in that: Along the vertical direction of the housing (1), the bathroom heat exchanger (13) is located below the main heat exchanger (6).

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