Direct-expansion outdoor unit of integrated double-L heat exchanger variable-frequency air-cooled heat pump

Abstract

The utility model provides an integrated double-L heat exchanger frequency conversion air cooling heat pump direct expansion outdoor unit which comprises a compressor, a refrigerant pipeline system, a supporting stand column assembly, a left side air cooling fin type condenser, a right side air cooling fin type condenser, an integrated metal plate base plate and a direct current axial flow fan. The left side air cooling fin type condenser is connected with the right side air cooling fin type condenser; the left air-cooled finned condenser and the right air-cooled finned condenser are arranged on the integrated sheet metal chassis through the supporting stand column assembly, and the compressor and the refrigerant pipeline system are arranged in the space defined by the left air-cooled finned condenser and the right air-cooled finned condenser and arranged on the integrated sheet metal chassis. The direct current axial flow fan is arranged above the left side air cooling fin type condenser and the right side air cooling fin type condenser through a connecting assembly. The high-pressure cavity full-direct-current variable-frequency compressor has the advantages that the rotating speed of 20-120 hz can be linearly adjusted, and linear stepless adjustment of refrigerating (heating) capacity is effectively achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of commercial central air-conditioning equipment, in particular to an outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion. Background Art

[0002] In the field of medical purification, especially some small biological laboratories and hospital clean auxiliary rooms, due to limited investment, they basically do not use high-investment chillers, but instead use variable frequency air-cooled heat pump direct expansion outdoor units. Therefore, in the field of purification, variable frequency air-cooled heat pump direct expansion units are more commonly used.

[0003] Usually, since the outdoor unit of the variable frequency air-cooled heat pump direct expansion only includes the compressor, outdoor heat exchanger, expansion valve and other units, but does not include the indoor heat exchanger, the outdoor unit of the variable frequency air-cooled heat pump direct expansion is usually used in conjunction with an air handling unit. That is, the indoor heat exchanger is located inside the air handling unit. In the cooling process, the indoor heat exchanger is equivalent to the evaporator, which cools and dehumidifies the air by absorbing the heat from the air flowing through its surface; in the heating process, the indoor heat exchanger is equivalent to the condenser, which heats and raises the temperature of the air flowing through its surface by condensing the high-temperature and high-pressure gas from the compressor. In this way, the cooling and heating functions are achieved.

[0004] Since the outdoor unit of the variable frequency air-cooled heat pump direct expansion does not require secondary heat exchange of the refrigerant, its installation does not require water pipes, water pumps, buffer water tanks and other water system related equipment. During use, there is no need to preheat or precool the water in the tank. Therefore, its installation and use are more convenient.

[0005] The outdoor unit of the wind-inverter air-cooled heat pump direct expansion does not have secondary heat exchange like the chiller. Its evaporator or condenser directly exchanges heat with the air entering the room, which is more efficient. At the same time, in response to the national dual-carbon environmental protection concept, the cooling or heating efficiency of the unit is becoming more and more a key consideration for building energy conservation.

[0006] When air conditioning units are in operation, they operate at partial load most of the time. Therefore, we cannot only consider the operation evaluation of a single cooling or heating season, but also conduct a comprehensive annual evaluation of the cooling and heating of the system. Utility Model Content

[0007] In view of this, the utility model aims to propose an outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion to solve the problems of high energy consumption and high noise.

[0008] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0009] An integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion outdoor unit, comprising a compressor, a refrigerant piping system, a support column assembly, a left-side air-cooled finned condenser, a right-side air-cooled finned condenser, an integrated sheet metal chassis, and a DC axial flow fan;

[0010] The left side air-cooled finned condenser and the right side air-cooled finned condenser are connected;

[0011] The left-side air-cooled finned condenser and the right-side air-cooled finned condenser are arranged on the integrated sheet metal chassis through the support column assembly, and the compressor and the refrigerant pipeline system are arranged inside the space surrounded by the left-side air-cooled finned condenser and the right-side air-cooled finned condenser, and are arranged on the integrated sheet metal chassis;

[0012] The DC axial flow fan is arranged above the left air-cooled fin-type condenser and the right air-cooled fin-type condenser through a connecting component.

[0013] Further, the support column assembly includes a front left column, a front right column, a rear column, and a rear middle column;

[0014] The front left column is arranged at the end of the left air-cooled fin condenser, and the front right column is arranged at the end of the right air-cooled fin condenser; the two rear columns are arranged at the bending parts of the left air-cooled fin condenser and the right air-cooled fin condenser respectively, and the rear middle column is arranged at the connection between the left air-cooled fin condenser and the right air-cooled fin condenser.

[0015] Further, the left air-cooled finned condenser is connected to the electrical access panel via the front left column, and the right air-cooled finned condenser is connected to the mechanical access panel via the front right column;

[0016] The electrical access panel is connected to the mechanical access panel through the front center column.

[0017] Furthermore, a sealed waterproof variable frequency electric control box is provided on the inner side of the electric maintenance panel through an electric control box crossbeam assembly.

[0018] Furthermore, the sealed waterproof variable frequency electric control box is arranged below the DC axial flow fan. The sealed waterproof variable frequency electric control box is installed at a relatively close position below the DC brushless axial flow fan. While the DC brushless axial flow fan is dissipating heat to the left air-cooled finned condenser and the right air-cooled finned condenser, the waterproof electric control box arranged inside the air duct can also fully dissipate heat with the help of airflow, effectively alleviating the heat dissipation problem of the electric control box in high temperature weather and ensuring reliability.

[0019] The sealed waterproof frequency conversion electric control box is electrically connected to the compressor, the DC axial flow fan and the refrigerant pipeline system respectively.

[0020] Furthermore, the electric control box crossbeam assembly includes an upper crossbeam and a lower crossbeam of the electric control box. One side of the upper crossbeam and the lower crossbeam of the electric control box is set on the electrical maintenance panel, and the other side of the upper crossbeam and the lower crossbeam of the electric control box is connected to the sealed waterproof variable frequency electric control box.

[0021] Furthermore, the connection assembly includes an upper frame of the condenser, which is U-shaped and is arranged between the DC axial flow fan and the left-side air-cooled fin-type condenser and the right-side air-cooled fin-type condenser.

[0022] Furthermore, the upper parts of the left-side air-cooled fin-type condenser and the right-side air-cooled fin-type condenser are connected through an upper frame connecting plate of the heat exchanger.

[0023] Furthermore, a wooden bottom frame is provided at the bottom of the integrated sheet metal chassis.

[0024] Furthermore, the compressor is a full DC variable frequency high-speed compressor, which can automatically adjust the speed according to the actual needs of the room, automatically reduce the speed after the room working conditions are stable, and increase the speed in time to offset the increase in room load when the room load demand increases, achieving true on-demand output and effectively controlling room temperature fluctuations, thereby providing a more comfortable physical experience, and completely avoiding the problem that the fixed-frequency compressor can only balance the room load by turning it on or off, causing the temperature to fluctuate and the fluctuation amplitude to be too large. At the same time, especially under partial load conditions, the compressor intelligently operates at a variable speed, so that the whole machine has a higher performance coefficient. The fully optimized partial load characteristics can also ensure better noise performance of the unit under conditions with lower load demand, such as at night.

[0025] Furthermore, the axial flow fan is a high-strength metal large-diameter vortex fan, and the driving motor of the high-strength metal large-diameter vortex fan is a DC brushless motor. The DC brushless motor intelligently adjusts the speed according to the suction pressure and exhaust pressure of the refrigeration system. Therefore, under partial load conditions, the fan no longer needs to run at full speed, which effectively reduces the fan noise and avoids the high energy consumption problem caused by the fan always running at a high speed, thereby achieving a balance between the supply and demand of the condensing air volume. At the same time, intelligent speed regulation according to the pressure of the refrigerant system can also make the refrigerant system always in a dynamically stable working state, avoiding the potential safety hazards caused by system pressure fluctuations.

[0026] Compared with the prior art, the outdoor unit of the integrated double L heat exchanger variable frequency air-cooled heat pump direct expansion described in the utility model has the following advantages:

[0027] 1. The low-noise variable-frequency air-cooled heat pump direct expansion outdoor unit described in the utility model adopts a high-pressure chamber full-DC variable-frequency compressor, has the characteristic of linearly adjustable speed of 20 to 120 Hz, and effectively realizes linear stepless regulation of cooling (heating) capacity.

[0028] 2. The low-noise variable-frequency air-cooled heat pump direct expansion outdoor unit described in the utility model has the characteristics of linear stepless adjustment of the compressor, which fully adapts to the performance requirements of partial loads, has a higher performance coefficient throughout the year, and is more energy-efficient to use.

[0029] 3. The low-noise variable-frequency air-cooled heat pump direct expansion outdoor unit described in the utility model adopts a high-strength metal large-diameter vortex fan in combination with a DC variable-frequency brushless motor, which greatly reduces the fan speed under low-load conditions such as at night, thereby saving energy and effectively reducing the noise of the unit.

[0030] 4. The low-noise variable-frequency air-cooled heat pump direct expansion outdoor unit described in the utility model adopts a fully sealed full-DC variable-frequency electric control box, which includes a full-DC variable-frequency compressor, a DC brushless fan motor, and a main control hardware to achieve integrated control of the entire machine.

[0031] 5. The low-noise variable-frequency air-cooled heat pump direct expansion outdoor unit described in the utility model adopts an air-cooled fin-type condenser with an internally threaded copper tube and a hydrophilic aluminum foil in series. The internally threaded copper tube and the window-opened cross-flow hydrophilic aluminum foil have a higher heat exchange enhancement coefficient and a higher heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of the exploded structure of an outdoor unit of an integrated double-L heat exchanger, a full DC variable frequency air-cooled heat pump direct expansion according to an embodiment of the utility model;

[0034] Figure 2 This is a schematic diagram of the overall structure of an outdoor unit of an integrated double-L heat exchanger, a full DC variable frequency air-cooled heat pump direct expansion according to an embodiment of the utility model;

[0035] Figure 3 This is a schematic diagram of removing the inspection panel of the outdoor unit of the integrated double L heat exchanger, full DC variable frequency air-cooled heat pump direct expansion described in an embodiment of the utility model.

[0036] Description of reference numerals:

[0037] 1. Three-dimensional sheet metal chassis; 2. Front left column; 3. Front right column; 4. Rear column; 5. Upper crossbeam of electric control box; 6. Lower crossbeam of electric control box; 7. Sealed waterproof variable frequency electric control box; 8. Left air-cooled finned condenser; 9. Right air-cooled finned condenser; 10. DC axial flow fan; 11. Compressor; 12. Front middle column; 13. Mechanical maintenance panel; 14. Heat exchanger upper frame connecting plate; 15. Rear middle column; 16. Condenser upper frame; 17. Wooden bottom frame; 18. Refrigerant piping system; 19. Electrical maintenance panel. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] An integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion outdoor unit comprises a compressor 11, a refrigerant piping system 18, a support column assembly, a left-side air-cooled finned condenser 8, a right-side air-cooled finned condenser 9, an integrated sheet metal chassis 1, and a DC axial flow fan 10; the left-side air-cooled finned condenser 8 and the right-side air-cooled finned condenser 9 are connected; the left-side air-cooled finned condenser 8 and the right-side air-cooled finned condenser 9 are arranged on the integrated sheet metal chassis through the support column assembly, the compressor 11 and the refrigerant piping system 18 are arranged inside the space surrounded by the left-side air-cooled finned condenser 8 and the right-side air-cooled finned condenser 9, and are arranged on the integrated sheet metal chassis 1; the DC axial flow fan 10 is arranged above the left-side air-cooled finned condenser 8 and the right-side air-cooled finned condenser 9 through a connecting assembly.

[0041] The supporting column assembly includes a front left column 2, a front right column 3, a rear column 4, and a rear middle column 15; the front left column 2 is arranged at the end of the left air-cooled fin-type condenser 8, and the front right column 3 is arranged at the end of the right air-cooled fin-type condenser 9; the two rear columns 4 are respectively arranged at the bending parts of the left air-cooled fin-type condenser 8 and the right air-cooled fin-type condenser 9, and the rear middle column 15 is arranged at the connection between the left air-cooled fin-type condenser 8 and the right air-cooled fin-type condenser 9.

[0042] The left side air-cooled finned condenser 8 is connected to the electrical inspection panel 19 through the front left column 2, and the right side air-cooled finned condenser 9 is connected to the mechanical inspection panel 13 through the front right column 3; the electrical inspection panel 19 is connected to the mechanical inspection panel 13 through the front middle column 12. The inner side of the electrical inspection panel 19 is provided with a sealed waterproof variable frequency electric control box 7 through the electric control box crossbeam assembly. The sealed waterproof variable frequency electric control box 7 is arranged below the DC axial flow fan 10. The sealed waterproof variable frequency electric control box 7 is installed at a position close to the DC brushless axial flow fan. While the DC brushless axial flow fan dissipates heat for the left side air-cooled finned condenser 8 and the right side air-cooled finned condenser 9, the waterproof electric control box arranged inside the air duct can also fully dissipate heat with the help of airflow, effectively alleviating the heat dissipation problem of the electric control box in high temperature weather and ensuring reliability. The sealed waterproof variable frequency electric control box 7 is electrically connected to the compressor 11, the DC axial flow fan 10, and the refrigerant pipeline system 18 respectively.

[0043] The electric control box crossbeam assembly includes an upper crossbeam 5 and a lower crossbeam 6 of the electric control box. One side of the upper crossbeam 5 and the lower crossbeam 6 of the electric control box is arranged on the electrical maintenance panel 19, and the other side of the upper crossbeam 5 and the lower crossbeam 6 of the electric control box is connected to the sealed waterproof variable frequency electric control box 7.

[0044] The connection assembly includes a condenser upper frame 16, which is U-shaped and is disposed between the DC axial flow fan 10 and the left air-cooled fin condenser 8 and the right air-cooled fin condenser 9. The upper parts of the left air-cooled fin condenser 8 and the right air-cooled fin condenser 9 are connected by an upper frame connection plate 14. A wooden bottom frame 17 is provided at the bottom of the integrated sheet metal chassis 1.

[0045] like Figure 1 As shown, an integrated double-L heat exchanger full DC variable frequency air-cooled heat pump direct expansion outdoor unit, including a refrigerant piping system 18 including a compressor 11, is placed in an internal space surrounded by a front left column 2, a front right column 3, a rear column 4, a rear middle column 15, a left air-cooled finned condenser 8, a right air-cooled finned condenser 9 and an integrated sheet metal chassis 1, which effectively isolates the electromagnetic and mechanical noise generated by the compressor when running at high speed, thereby ensuring operating comfort.

[0046] like Figure 1As shown, an outdoor unit of an integrated double-L heat exchanger, a fully DC variable frequency air-cooled heat pump direct expansion, the compressor 11 is a fully DC variable frequency high-speed compressor, which can automatically adjust the speed according to the actual needs of the room, and automatically reduce the speed after the room working conditions are stable. When the room load demand increases, the speed is promptly increased to offset the increase in the room load, achieving true on-demand output and effectively controlling the fluctuation of room temperature, so as to have a more comfortable physical experience, and completely avoiding the problem that the fixed-frequency compressor can only balance the room load by turning it on or off, causing the temperature to fluctuate and the fluctuation amplitude to be too large. At the same time, especially under partial load conditions, the compressor intelligently operates at a variable speed, so that the whole machine has a higher performance coefficient. The fully optimized partial load characteristics can also ensure better noise performance of the unit under conditions with low load demand such as at night.

[0047] like Figure 1 As shown, an outdoor unit of an integrated double L heat exchanger, a full DC variable frequency air-cooled heat pump direct expansion, the axial flow fan 10 adopts a high-strength metal large-diameter vortex fan, and the motor is a DC brushless motor. The DC brushless motor intelligently adjusts the speed according to the suction pressure and exhaust pressure of the refrigeration system. Therefore, under partial load conditions, the fan no longer needs to run at full speed, which effectively reduces the fan noise and avoids the high energy consumption problem caused by the fan always running at a high speed, thereby achieving a balance between the supply and demand of the condensing air volume. At the same time, the intelligent speed regulation according to the pressure of the refrigerant system can also make the refrigerant system always in a dynamically stable working state, avoiding the potential safety hazards caused by system pressure fluctuations.

[0048] like Figure 1 As shown, a low-noise variable-frequency air-cooled heat pump direct expansion outdoor unit, the left-side air-cooled fin condenser 8 and the right-side air-cooled fin condenser 9 use air-cooled fin condensers with internally threaded copper tubes and hydrophilic aluminum foil in series. The internally threaded copper tubes with special internal spiral lines and window-opened cross-flow hydrophilic aluminum foil can fully enhance heat exchange, thereby having a higher heat exchange efficiency.

[0049] like Figure 2 As shown, a low-noise variable-frequency air-cooled heat pump direct expansion outdoor unit, after the mechanical inspection panel 13 and the electrical inspection panel 19 are installed, the unit as a whole presents a sealed box structure, and the compressor refrigerant system that is prone to noise is isolated inside the unit by sheet metal. The sealed sheet metal enclosure structure has the dual functions of aesthetics and noise reduction.

[0050] like Figure 3 As shown, a low-noise variable frequency air-cooled heat pump direct expansion outdoor unit is based on a wooden bottom frame 17, on which an integrated sheet metal chassis 1 is sequentially installed, and around the sheet metal chassis are installed a front left column 2, a front right column 3, and a rear column 4, and a DC brushless axial flow fan 10 is installed on the upper part. The structures are connected by bolts and interlocked.

[0051] like Figure 3 As shown, a low-noise variable-frequency air-cooled heat pump direct expansion outdoor unit, a sealed waterproof variable-frequency electric control box 7 is fixed by an upper crossbeam 5 and a lower crossbeam 6 of the electric control box, and the upper crossbeam and the lower crossbeam are fixed to the front left column 2 and the front right column 3, and the structural parts are interlocked by bolt connection.

[0052] like Figure 3 As shown, the sealed waterproof variable frequency electric control box 7 is installed at a position close to the DC brushless axial flow fan 10. While the DC brushless axial flow fan 10 dissipates heat to the left air-cooled fin condenser 8 and the right air-cooled fin condenser 9, the waterproof electric control box 7 arranged inside the air duct can also fully utilize the airflow for heat dissipation, effectively alleviating the heat dissipation problem of the electric control box in high temperature weather and ensuring reliability.

[0053] like Figure 3 As shown, the sealed waterproof variable frequency electric control box 7 integrates all the control functions of the full DC variable frequency compressor 11, the DC brushless axial flow fan 10, and the entire refrigeration system. The electric control box has multiple functions of waterproofing, heat dissipation, and electromagnetic isolation to ensure the stable and reliable operation of multiple inverters.

[0054] The low-noise variable frequency air-cooled heat pump direct expansion outdoor unit described in this embodiment adopts a full DC variable frequency compressor, a DC brushless axial flow fan, a high-efficiency air-cooled fin-type condenser, and a variable sealed waterproof variable frequency electric control box. It is more energy-efficient to use throughout the year, fully saves operating expenses, and reduces carbon emissions; the energy supply and demand balance fully reduces room temperature fluctuations, reduces invalid adjustments, and greatly improves the comfort of use; the optimized structural design with silencing function can ensure that the unit has a better noise performance during operation.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated double L heat exchanger variable frequency air-cooled heat pump direct expansion outdoor unit, characterized in that: It comprises a compressor (11), a refrigerant pipeline system (18), a support column assembly, a left-side air-cooled finned condenser (8), a right-side air-cooled finned condenser (9), an integrated sheet metal chassis (1), and a DC axial flow fan (10); The left side air-cooled finned condenser (8) and the right side air-cooled finned condenser (9) are connected; The left-side air-cooled finned condenser (8) and the right-side air-cooled finned condenser (9) are arranged on an integrated sheet metal chassis via a supporting column assembly; the compressor (11) and the refrigerant pipeline system (18) are arranged inside a space surrounded by the left-side air-cooled finned condenser (8) and the right-side air-cooled finned condenser (9), and are arranged on the integrated sheet metal chassis (1); The DC axial flow fan (10) is arranged above the left-side air-cooled fin-type condenser (8) and the right-side air-cooled fin-type condenser (9) via a connecting assembly.

2. According to claim 1, an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion outdoor unit is characterized by: The supporting column assembly comprises a front left column (2), a front right column (3), a rear column (4), and a rear middle column (15); The front left column (2) is arranged at the end of the left air-cooled fin-type condenser (8), and the front right column (3) is arranged at the end of the right air-cooled fin-type condenser (9); the two rear columns (4) are respectively arranged at the bending parts of the left air-cooled fin-type condenser (8) and the right air-cooled fin-type condenser (9), and the rear middle column (15) is arranged at the connection between the left air-cooled fin-type condenser (8) and the right air-cooled fin-type condenser (9).

3. The outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion according to claim 2, characterized in that: The side air-cooled finned condenser is connected to the electrical maintenance panel (19) via the front left column (2), and the right side air-cooled finned condenser (9) is connected to the mechanical maintenance panel (13) via the front right column (3); The electrical maintenance panel (19) is connected to the mechanical maintenance panel (13) via the front middle column (12).

4. The outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion according to claim 3, characterized in that: A sealed waterproof variable frequency electric control box (7) is provided on the inner side of the electric inspection panel (19) via an electric control box crossbeam assembly.

5. The outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion according to claim 4, characterized in that: The sealed waterproof variable frequency electric control box (7) is arranged below the DC axial flow fan (10).

6. The outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion according to claim 4, characterized in that: The electric control box crossbeam assembly comprises an upper crossbeam (5) and a lower crossbeam (6) of the electric control box. One side of the upper crossbeam (5) and the lower crossbeam (6) of the electric control box is arranged on an electrical inspection panel (19), and the other side of the upper crossbeam (5) and the lower crossbeam (6) of the electric control box is connected to a sealed waterproof variable frequency electric control box (7).

7. The outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion according to claim 1, characterized in that: The connection assembly comprises a condenser upper frame (16), which is U-shaped and arranged between the DC axial flow fan (10) and the left side air-cooled fin condenser (8) and the right side air-cooled fin condenser (9).

8. The outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion according to claim 1, characterized in that: The upper parts of the left-side air-cooled fin-type condenser (8) and the right-side air-cooled fin-type condenser (9) are connected via an upper frame connecting plate (14) of the heat exchanger.

9. The outdoor unit of an integrated double L heat exchanger variable frequency air-cooled heat pump direct expansion according to claim 1, characterized in that: A wooden bottom frame (17) is provided at the bottom of the integrated sheet metal chassis (1).

10. The outdoor unit of an integrated double-L heat exchanger variable frequency air-cooled heat pump direct expansion according to claim 1, characterized in that: The compressor (11) is a full DC variable frequency high speed compressor (11).

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