Indoor heat pump air conditioner

Abstract

The utility model belongs to the technical field of air conditioners, and particularly relates to an indoor heat pump air conditioner which comprises an equipment shell, a circulating fan is arranged in the equipment shell, an air inlet of the circulating fan is communicated with an air return cavity in the equipment shell, the air return cavity is communicated with an air return opening in the surface of the equipment shell, and an air outlet of the circulating fan is communicated with the air return opening in the surface of the equipment shell. An air outlet of the circulating fan communicates with an air supply outlet in the surface of the equipment shell, an air filter is arranged at the joint of an air inlet of the circulating fan and the air return cavity, and the air return cavity is further connected with a fresh air pipe. Core components such as a compressor, a heat exchanger and a water pump are integrally arranged, pipeline redundancy is reduced, installation space is saved, meanwhile, overhaul and maintenance are facilitated, resource conditions of different regions are met, environmental heat energy is directly utilized, fossil energy dependence is reduced, and carbon emission is reduced.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an indoor heat pump air conditioner. Background Technology

[0002] As a highly efficient, energy-saving, and environmentally friendly technology, heat pump air conditioning systems are widely used in heating, hot water, and drying. With the outbreak of the global energy crisis and the rise in fuel prices, heat pump technology has regained attention due to its efficient recovery of low-temperature environmental heat energy and its energy-saving and environmentally friendly characteristics. Utility Model Content

[0003] This utility model provides an indoor heat pump air conditioner, which aims to combine a shell-and-tube heat exchanger and a finned heat exchanger. The shell-and-tube heat exchanger is highly efficient and pressure-bearing, suitable for water circulation, while the finned heat exchanger has a large surface area, suitable for air heat exchange. During cooling, the finned heat exchanger acts as an evaporator to absorb heat, and during heating, it becomes a condenser to release heat, flexibly adapting to operating conditions.

[0004] This utility model provides the following technical solution:

[0005] An indoor heat pump air conditioner includes a housing, a circulating fan inside the housing, an air inlet of the circulating fan communicating with a return air chamber inside the housing, a return air chamber communicating with a return air outlet on the surface of the housing, an air outlet of the circulating fan communicating with a supply air outlet on the surface of the housing, an air filter being installed at the connection between the air inlet of the circulating fan and the return air chamber, a fresh air duct being connected to the return air chamber, and a compressor, a shell-and-tube (plate) heat exchanger, a finned heat exchanger, and a throttling valve forming a cooling or heating circulation loop inside the housing, as well as an energy supply circulation loop formed by a circulating water pump, a shell-and-tube heat exchanger, and an outdoor pipe network.

[0006] In one possible configuration, the air inlet of the circulating fan is connected to a return air converging pipe, and the air outlet of the circulating fan is connected to an air supply expanding pipe.

[0007] In one possible embodiment, the air filter includes a frame mounted to the device housing and filter material in a W-shaped continuous fold mounted on the frame.

[0008] In one possible configuration, the inner end of the fresh air duct is located within the return air chamber and communicates with the fresh air inlet, while the outer end of the fresh air duct is connected to the outside of the equipment housing.

[0009] In one possible embodiment, an electrical cabinet is also provided inside the equipment housing. In the electrical cabinet, the power supply is connected through a circuit breaker and then connected to equipment such as a small compressor, circulating water pump, and circulating fan via the main contacts of a contactor, forming a main power supply circuit. The power supply is connected to a control circuit via a start button. The control circuit drives the contactor coil after processing by an intermediate relay or PLC logic. The contactor action can control the on / off state of the main power supply circuit.

[0010] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0011] In this invention, the coordinated design of the circulating fan and the return air chamber ensures rapid indoor air circulation, reduces temperature stratification, and improves the uniformity of cooling / heating. A filter is installed at the air inlet to effectively intercept pollutants such as dust, prevent dust accumulation in the internal heat exchanger, extend the equipment's lifespan, and significantly improve indoor air quality. Fresh outdoor air is introduced through the fresh air duct and mixed with the return air as needed, avoiding the increase in CO2 concentration caused by the closed environment of traditional air conditioning and improving human comfort.

[0012] In this invention, a combination of shell-and-tube heat exchanger and finned heat exchanger is used. The shell-and-tube heat exchanger is highly efficient and pressure-bearing, suitable for water circulation, while the finned heat exchanger has a large surface area, suitable for air heat exchange. During cooling, the finned heat exchanger acts as an evaporator to absorb heat, and during heating, it becomes a condenser to release heat, flexibly adapting to operating conditions and improving the energy efficiency ratio.

[0013] In this invention, an outdoor pipe network is connected to a ground-source buried water system, utilizing a relatively stable underground temperature field.

[0014] In this utility model, the core components such as the compressor, heat exchanger, and water pump are integrated into a single layout, the pipeline arrangement is compact, saving installation space and facilitating inspection and maintenance. The filter is placed in front to protect the fan and heat exchanger, reducing the frequency of maintenance.

[0015] In this invention, the power supply circuit can be adapted to underground buried pipe heat exchange systems of different sizes to meet the resource conditions of different regions. It can indirectly maximize the use of solar energy heat, reduce dependence on fossil fuels, and reduce carbon emissions. Attached Figure Description

[0016] Figure 1 One of the internal structural schematic diagrams of an indoor heat pump air conditioner provided in this embodiment of the present utility model;

[0017] Figure 2 A front view of an indoor heat pump air conditioner provided in an embodiment of this utility model;

[0018] Figure 3 This is a second schematic diagram of the internal structure of an indoor heat pump air conditioner provided in an embodiment of this utility model.

[0019] Figure label:

[0020] 1. Small compressor; 2. Finned heat exchanger; 3. Shell and tube heat exchanger; 4. Circulating water pump; 5. Circulating fan; 6. Air filter; 7. Fresh air duct; 8. Supply air diffuser; 9. Return air reducer; 10. Electrical cabinet; 11. External supply air reducer; 12. External return air reducer. Detailed Implementation

[0021] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0022] like Figures 1-3 As shown, a pump air conditioner includes an equipment housing, which is rectangular in shape and is formed by a bottom plate, a front side plate, a rear side plate, a left side plate, a right side plate, and a top plate. A return air inlet and a supply air outlet are provided on the front side plate. The return air inlet is connected to an external return air reducer 12, and the supply air outlet is connected to an external supply air reducer 11.

[0023] The unit is enclosed by a base plate, front / rear / left / right side plates, and a top plate to form a standardized rectangular structure, which improves space utilization and makes it an integrated unit. The core components such as the compressor, heat exchanger, and water pump are integrated into one layout, reducing pipeline redundancy, saving installation space, and facilitating inspection and maintenance. The filter is placed in front to protect the fan and heat exchanger, reducing the frequency of maintenance.

[0024] A circulating fan 5 is installed in the middle of the base plate. The air inlet on the right side of the circulating fan 5 is connected to the constricting end of the return air tapering pipe 9. The flared end of the return air tapering pipe 9 is connected to the air outlet of the air filter 6. The tapering structure accelerates the return airflow, reducing the fan's suction resistance and noise.

[0025] The air inlet of the air filter 6 is connected to the return air cavity, which is enclosed by a partition, a bottom plate, a top plate, a front side plate, a rear side plate, and a right side plate. The return air inlet of the front side plate is connected to the return air cavity, and the partition has a through-hole adapted to the air inlet of the air filter 6. After the air inlet of the air filter 6 is connected to the through-hole, it can communicate with the return air cavity. The air filter 6 is located between the flared end of the return air converging pipe 9 and the return air cavity. The return air has been filtered before entering the circulating fan 5 to prevent dust, hair and other pollutants from adhering to the surface of the heat exchanger and maintain long-term stable heat exchange efficiency.

[0026] A fresh air duct 7 is also installed in the return air cavity. The inner end of the fresh air duct 7 is connected to the return air cavity, and the outer end of the fresh air duct 7 passes through the right side plate and is connected to the outside. The fresh air inlet is connected to the return air cavity. An electric control device is installed in the inner end of the fresh air duct 7 to adjust the fresh air volume as needed. The fresh air and return air are evenly mixed in the return air cavity.

[0027] An installation port is provided on the bottom or top plate for easy removal of the air filter 6. Standardized installation ports are provided on the bottom or top plate to support the removal of the air filter 6 from the bottom or top, adapting to different installation scenarios. For example, it can be inspected from the bottom when ceiling-mounted and operated from the top when floor-standing. The maintenance time is shortened from 15 minutes for traditional screw fixing to within 3 minutes, so that the air conditioning filter can be inspected at any time. The air conditioning filter includes an outer frame connected to the equipment housing. The outer frame is equipped with W-shaped continuous folded filter material, which can effectively increase the filtration area and improve the filtration effect. The W-shaped continuous folded structure makes the effective area of ​​the filter material several times that of the windward side.

[0028] The outlet of the circulating fan 5 is connected to the constriction end of the air supply diffuser 8. The air supply diffuser 8 gradually expands from the constriction end to the expansion end, and the airflow speed gradually decreases, effectively offsetting the wind resistance of the finned heat exchanger 2, ensuring the stability of long-distance air supply, and reducing noise. The expansion end of the air supply diffuser 8 is connected to the air outlet of the front side plate, and the expansion end of the air supply diffuser 8 is equipped with finned heat exchangers 2 covering the expansion end of the air supply diffuser 8. The cross-sectional area of ​​the expansion end is fully matched with the windward side of the finned heat exchanger 2, and the airflow evenly covers the surface of the heat exchanger, avoiding local "dead zones".

[0029] An electrical cabinet 10, a small compressor 1, a shell-and-tube heat exchanger 3, and a circulating water pump 4 are installed on the left side of the circulating fan 5. The electrical cabinet 10 is installed on the front side plate and the left side plate, while the small compressor 1, the shell-and-tube heat exchanger 3, and the circulating water pump 4 are installed on the bottom plate.

[0030] In electrical cabinet 10, the power supply is connected through a circuit breaker and then connected to equipment such as small compressor 1, circulating water pump 4, and circulating fan 5 via the main contacts of the contactor, forming the main power supply circuit. The power supply is connected to the control circuit via a start button. The control circuit drives the contactor coil after processing by an intermediate relay or PLC logic. The contactor action can control the on / off of the main power supply circuit.

[0031] The compressor discharge port is connected to the inlet of the shell-and-tube heat exchanger 3-pass by welding or flange through copper or steel pipe. The outlet of the shell-and-tube heat exchanger 3-pass by copper pipe is connected to the throttle valve, usually by brazing or flared connection. The outlet of the throttle valve is connected to the inlet of the finned evaporator through copper pipe, fixed by flared or threaded connection. The outlet of the finned evaporator is connected to the compressor suction port through copper pipe, which can be connected by welding or flange.

[0032] Among them, the shell-side inlet of the shell-and-tube heat exchanger 3 is connected to the outlet of the circulating water pump 4, the inlet of the circulating water pump 4 is connected to the water supply interface of the outdoor pipe network, and the shell-side outlet of the shell-and-tube heat exchanger 3 is connected to the return water interface of the outdoor pipe network.

[0033] The cooling or heating loop, consisting of a compressor, shell-and-tube heat exchanger 3, finned heat exchanger 2, and expansion valve, provides energy conversion and temperature increase functions. The circulating water pump 4 and shell-and-tube heat exchanger 3 exchange heat with the underground temperature field through the outdoor pipe network to obtain the energy required for cooling or heating.

[0034] The outdoor pipe network, as the core component for heat exchange with the underground soil, is buried in the shallow underground layer and uses the constant temperature characteristics of the soil to absorb or release heat. The circulating water pump 4 drives water to circulate in the shell side of the outdoor pipe network and the indoor shell heat exchanger 3 to realize the transport of heat.

[0035] Cooling mode: Indoor heat is transferred to the refrigerant in the finned heat exchanger 2 through the finned heat exchanger 2. The refrigerant exchanges heat with the underground circulating water in the shell side of the tube heat exchanger 3. The circulating water pump 4 drives the high temperature water to flow into the underground buried pipe, releasing heat to the soil. The cooled water returns to the heat exchanger to complete the cycle.

[0036] Heating mode: The underground pipe absorbs low-temperature heat from the soil. The circulating water pump 4 delivers low-temperature water to the shell side of the shell-and-tube heat exchanger 3. The refrigerant in the tube side of the shell-and-tube heat exchanger 3 evaporates and absorbs heat from the circulating water. The heated refrigerant is compressed and flows to the finned heat exchanger 2. The circulating fan 5 draws air from the return air port and sends it to the finned heat exchanger 2. The air is heated after passing through the finned heat exchanger 2, thereby releasing heat energy into the room. Meanwhile, the underground circulating water in the shell side of the shell-and-tube heat exchanger 3 releases heat, cools down, and flows back into the ground to absorb heat.

[0037] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A room heat pump air conditioner characterized by comprising: The device includes a housing, within which a circulating fan is installed. The air inlet of the circulating fan is connected to a return air chamber inside the housing, and the return air chamber is connected to a return air outlet on the surface of the housing. The air outlet of the circulating fan is connected to an air supply outlet on the surface of the housing. An air filter is installed at the connection between the air inlet of the circulating fan and the return air chamber. The return air chamber is also connected to a fresh air duct. The housing also contains a compressor, a shell-and-tube heat exchanger or a plate heat exchanger, a finned heat exchanger, and a throttling valve forming a refrigeration or heating circulation loop, as well as an energy supply circulation loop formed by a circulating water pump, a shell-and-tube heat exchanger, and an outdoor pipe network.

2. An indoor heat pump air conditioner according to claim 1, wherein The air inlet of the circulating fan is connected to a return air converging pipe, and the air outlet of the circulating fan is connected to an air supply expanding pipe.

3. An indoor heat pump air conditioner according to claim 1, wherein The air filter includes a frame mounted to the equipment housing and a W-shaped, continuously folded filter material mounted on the frame.

4. An indoor heat pump air conditioner according to claim 1, wherein The inner end of the fresh air duct is located inside the return air cavity and is connected to the air inlet of the fresh air fan, while the outer end of the fresh air duct is connected to the outside of the equipment housing.

5. An indoor heat pump air conditioner according to claim 1, wherein The equipment housing also contains an electrical cabinet. In the electrical cabinet, the power supply is connected through a circuit breaker and then connected to a small compressor, a circulating water pump, and a circulating fan via the main contacts of a contactor, forming the main power supply circuit. The power supply is connected to the control circuit via a start button. The control circuit drives the contactor coil after processing by an intermediate relay or PLC logic. The contactor action can control the on / off state of the main power supply circuit.

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