Air source heat pump using counter-rotating fan

Abstract

The utility model discloses an air source heat pump using a counter-rotating fan, which comprises a frame, a support plate arranged on the frame, a heat exchanger arranged on the support plate and the counter-rotating fan further arranged on the frame, and an airflow channel formed between the counter-rotating fan and the heat exchanger. The counter-rotating fan rotates to form airflow in the first direction so as to exhaust cold air generated after heat exchange of the heat exchanger, and the counter-rotating fan rotates to form airflow in the second direction so as to blow off a frost layer on the heat exchanger to the supporting plate. According to the air source heat pump using the contra-rotating fan, the contra-rotating fan is further arranged on the frame, the contra-rotating fan rotates to form airflow in the first direction, cold air generated around the heat exchanger is rapidly exhausted, the heat exchange efficiency of the air side is improved, the contra-rotating fan rotates to form airflow in the second direction, and the heat exchange efficiency of the air side is improved. And a frost layer on the heat exchanger is blown off to the supporting plate, so that the defrosting speed is increased, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of air source heat pump technology, and in particular relates to an air source heat pump using a counter-rotating fan. Background Technology

[0002] Air source heat pumps are one of the most common types of heating and cooling equipment. They are energy-saving devices that utilize high-grade energy to transfer heat from a low-grade heat source (air) to a high-grade heat source. Furthermore, air source heat pump units do not require dedicated machine rooms or boiler rooms; they can be placed on rooftops or the ground, without occupying valuable building space, making installation very simple. Therefore, based on the high heating efficiency and relatively low heating costs of air source heat pumps, and with technological advancements allowing them to operate in low ambient temperatures down to -30°C, numerous pilot and retrofit projects using air source heat pumps have been carried out in northern regions in recent years.

[0003] Currently, air source heat pumps all use heat exchangers on the air side. To enhance the heat exchange efficiency of these exchangers, axial flow fans are often added to improve convective heat transfer on the air side. However, axial flow fans have low air pressure and short air delivery distance. During prolonged centralized heating operation, the cooled air from the heat exchanger accumulates and settles, causing the surrounding air temperature to drop further. This gradually deteriorates the heat exchange efficiency on the air side of the heat pump. Furthermore, due to the generally low ambient temperatures in winter, air source heat pumps are extremely prone to frosting in low-temperature environments, further impacting their performance.

[0004] Therefore, there is an urgent need to design an air source heat pump that uses a counter-rotating fan to solve the problems mentioned above, such as the continuous accumulation and settling of cold air after heat exchange and cooling of the heat exchanger, and the easy occurrence of frost formation in air source heat pumps when operating in low-temperature environments, which reduces the operating energy efficiency of air source heat pumps. Utility Model Content

[0005] To address the technical problems mentioned in the background art, such as the continuous accumulation and settling of cold air after heat exchange and cooling of the heat exchanger, and the easy occurrence of frost formation in air source heat pumps operating in low-temperature environments, which reduces the working efficiency of air source heat pumps, an air source heat pump using a counter-rotating fan is provided to solve the above problems.

[0006] To achieve the above objectives, the specific technical solution of this utility model using an air source heat pump with a counter-cyclone fan is as follows:

[0007] An air source heat pump using a counter-rotating fan is characterized by comprising a frame, a support plate on the frame, a heat exchanger on the support plate, and a counter-rotating fan on the frame. An airflow channel is formed between the counter-rotating fan and the heat exchanger. The counter-rotating fan rotates to generate airflow in a first direction to exhaust cold air generated around the heat exchanger. The counter-rotating fan rotates to generate airflow in a second direction to blow frost off the heat exchanger onto the support plate.

[0008] Furthermore, the airflow generated by the rotation of the counter-cyclone fan along the first direction is opposite in direction to the airflow generated by the rotation of the counter-cyclone fan along the second direction.

[0009] Furthermore, the counter-rotating fan is installed at the top of the frame. The counter-rotating fan rotates to form an airflow in the first direction. The air flows upward along the side of the frame through the heat exchanger and is discharged from the top of the counter-rotating fan. The counter-rotating fan rotates to form an airflow in the second direction. The air flows downward through the heat exchanger and is discharged from the side of the frame, blowing the frost layer on the heat exchanger onto the support plate.

[0010] Furthermore, the counter-rotating blower includes a first blower and a second blower, which are coaxially arranged on the top of the frame. The first blower is connected to a first motor, and the second blower is connected to a second motor. The first motor controls the rotation direction of the first blower in the opposite direction to the rotation direction of the second blower controlled by the second motor.

[0011] Furthermore, the first fan is equipped with a first fan blade, and the second fan is equipped with a second fan blade, the number of the first fan blade and the number of the second fan blade are coprime numbers.

[0012] Furthermore, the cyclone fan also includes an air guide ring, with the first and second fans coaxially arranged inside the air guide ring. A protective net is provided at the outer end of the air guide ring away from the frame to protect the first and second fans.

[0013] Furthermore, it also includes a first flow channel and a second flow channel. The first flow channel is located at one end of the support plate, and the end of the first flow channel away from the support plate is connected to one side of the frame. The second flow channel is symmetrically located at the other end of the support plate, and the end of the second flow channel away from the support plate is connected to the other side of the frame.

[0014] Furthermore, the end of the support plate closest to the first flow channel and the end of the support plate closest to the second flow channel are both inclined.

[0015] Furthermore, a base plate is also provided on the frame, with the base plate and support plate spaced apart. A condenser, compressor and throttling device are provided between the base plate and support plate. A panel is provided on the side between the base plate and support plate, and a mesh plate is provided on the side between the support plate and the top of the frame.

[0016] Furthermore, there are multiple heat exchangers and multiple cyclone fans.

[0017] The air-source heat pump using a counter-rotating fan of this invention has the following advantages:

[0018] The cold air generated after heat exchange and cooling in the heat exchanger continues to accumulate and settle, affecting the air-side heat exchange efficiency. By installing counter-rotating fans on the frame, the rotation of the counter-rotating fans creates airflow in the first direction, increasing the air pressure and discharging the cold air generated after heat exchange in the heat exchanger upwards a greater distance. This prevents the ambient temperature around the heat pump from continuously decreasing, improving the air-side heat exchange efficiency and enhancing the operating energy efficiency of the heat pump unit. The rotation of the counter-rotating fans also creates airflow in the second direction, reversing the airflow direction and blowing the frost and water droplets on the heat exchanger onto the support plate, accelerating the defrosting speed and improving the operating energy efficiency of the air source heat pump. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the air source heat pump using a counter-rotating fan according to this utility model. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of the air source heat pump using a counter-rotating fan according to this utility model. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the structure of the cyclone fan of this utility model, which draws air along the first direction;

[0022] Figure 4 This is a schematic diagram of the structure of the cyclone fan of this utility model, which draws air in the second direction;

[0023] Figure 5 This is a schematic diagram of the structure of the cyclone fan of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the support plate of this utility model.

[0025] Explanation of markings in the diagram:

[0026] 1. Frame; 2. Support plate; 3. Heat exchanger; 4. Counter-rotating fan; 41. First fan blade; 42. Second fan blade; 43. Air guide ring; 44. Protective net; 45. Mounting plate; 5. Mesh plate; 6. Panel; 7. First flow channel; 8. Second flow channel. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0029] The following is a reference to the appendix. Figure 1 To be continued Figure 6 This invention describes an air source heat pump using a counter-rotating fan.

[0030] like Figures 1 to 4 As shown, the air source using a counter-cyclone fan in this invention includes a frame 1.

[0031] A support plate 2 is mounted on the frame 1, and a heat exchanger 3 is mounted on the support plate 2. A counter-rotating fan 4 is also mounted on the frame 1, forming an airflow channel between the counter-rotating fan 4 and the heat exchanger 3. The counter-rotating fan 4 rotates to generate airflow in a first direction to expel cold air generated around the heat exchanger 3. The counter-rotating fan 4 also rotates to generate airflow in a second direction, blowing frost off the heat exchanger 3 onto the support plate 2. In this embodiment, there are multiple heat exchangers 3 and multiple counter-rotating fans 4. In this embodiment, there are two heat exchangers 3 and two counter-rotating fans 4. In other embodiments, the number of heat exchangers 3 and counter-rotating fans 4 can be different. In this embodiment, the first direction is... Figure 3 The direction shown in L1 is the second direction. Figure 4 The direction indicated by L2. In this embodiment, the heat exchanger can be a finned heat exchanger or other types of heat exchangers.

[0032] After the heat exchanger 3 cools down, the cold air continues to accumulate and settle, affecting the air-side heat exchange efficiency. By installing a counter-rotating fan 4 on the frame 1, the fan 4 rotates to form an airflow in the first direction, increasing the air pressure and discharging the cold air generated around the finned heat exchanger 3 upwards to a greater distance, preventing the ambient temperature around the heat pump from continuously decreasing, improving the air-side heat exchange efficiency, and simultaneously enhancing the operating energy efficiency of the heat pump unit. The counter-rotating fan 4 also forms an airflow in the second direction, reversing the airflow direction and blowing the frost and water droplets on the heat exchanger 3 onto the support plate 2, accelerating the defrosting speed and improving the working efficiency of the air source heat pump.

[0033] Under normal operating conditions, the counter-cyclone fan 4 rotates to form an airflow along the first direction, quickly expelling the cold air generated around the heat exchanger 3 and improving the air-side heat exchange efficiency. When the air source heat pump detects that the frost condition on the heat exchanger 3 has reached a preset condition, the heat pump unit operates in defrost mode. After the defrost mode has been running for a set time, the counter-cyclone fan 4 rotates to form an airflow along the second direction, causing the airflow direction to reverse. By blowing air onto the heat exchanger 3 through the counter-cyclone fan 4, the semi-melted frost layer or melted condensed water droplets on the heat exchanger 3 can be blown off onto the support plate 2, thereby accelerating defrosting. After defrosting is completed, the air source heat pump stops the defrost mode, the counter-cyclone fan 4 rotates to form an airflow along the first direction, and the air source heat pump starts its normal operating mode. In this embodiment, the airflow along the first direction formed by the counter-cyclone fan 4 is in the opposite direction to the airflow along the second direction formed by the counter-cyclone fan 4.

[0034] Furthermore, such as Figures 1 to 4 As shown, the counter-rotating fan 4 is located at the top of the frame 1. The counter-rotating fan 4 rotates to create an airflow in a first direction. Air flows upward along the side of the frame 1, passes through the heat exchanger 3, and exits from the top of the counter-rotating fan 4. The counter-rotating fan 4 also rotates to create an airflow in a second direction. Air flows downward from the top of the counter-rotating fan, passes through the heat exchanger 3, and exits from the side of the frame to the outside of the unit, blowing frost and water droplets from the heat exchanger 3 onto the support plate 2. In other embodiments, the counter-rotating fan 4 can also be located on the side of the frame 1, as long as the corresponding function is achieved.

[0035] A base plate is also provided on the frame 1, with the base plate and support plate 2 spaced apart. A condenser, compressor, and throttling device are arranged between the base plate and support plate 2. A panel 6 is provided on the side between the base plate and support plate 2, and a mesh plate 5 is provided on the side between the support plate and the top of the frame. The heat exchanger 3, the counter-rotating fan 4, the support plate 2, and the top of the frame 1 form a closed cavity. The counter-rotating fan 4 is located on the top of the frame 1. When the air source heat pump unit is running, the air flows from the mesh plate 5 through the heat exchanger 3, enters the interior of the air source heat pump unit, that is, the interior of the cavity formed by the heat exchanger 3, and is discharged from the counter-rotating fan 4 at the top of the air source heat pump unit.

[0036] Furthermore, such as Figures 3 to 5 As shown, the counter-rotating fan 4 includes a first fan and a second fan, which are coaxially arranged. The first fan has a first blade 41, and the second fan has a second blade 42. The first blade 41 and the second blade 42 rotate in opposite directions. The number of first blades 41 and the number of second blades 42 are coprime numbers. For example, there are 7 first blades 41 and 5 second blades 42. By setting up the first fan and the second fan, and having them rotate in opposite directions, the air pressure can be increased, achieving the effect of long-distance air delivery. This effectively prevents the continuous accumulation and settling of cold air after heat exchange and cooling, avoids the continuous decrease in the ambient temperature around the heat pump, improves the air-side heat exchange efficiency, and is beneficial to improving the long-term operating energy efficiency of the heat pump cluster.

[0037] Furthermore, such as Figure 1 As shown, the first fan also includes a first motor, which drives the first fan blade 41 to rotate. The second fan also includes a second motor, which drives the second fan blade 42 to rotate. Under normal circumstances, when the counter-rotating fan 4 rotates to form an airflow along the first direction, the direction of rotation of the first fan blade 41 driven by the first motor is opposite to the direction of rotation of the second fan blade 42 driven by the second motor. That is, the first motor drives the first fan blade 41 to rotate clockwise, and the second motor drives the second fan blade 42 to rotate counterclockwise, which quickly exhausts the cold air generated around the heat exchanger 3 and improves the air-side heat exchange efficiency. When the counter-rotating fan 4 rotates to form an airflow along the second direction, the direction of rotation of the first fan blade 41 driven by the first motor is opposite to the direction of rotation of the second fan blade 42 driven by the second motor. That is, the first motor drives the first fan blade 41 to rotate counterclockwise, and the second motor drives the second fan blade 42 to rotate counterclockwise. By blowing air onto the heat exchanger 3 through the first and second fans, the frost or water droplets on the heat exchanger 3 can be blown off onto the support plate 2, thereby accelerating the defrosting process.

[0038] Furthermore, such as Figures 1 to 5 As shown, the counter-cyclone fan 4 also includes an air guide ring 43, and a mounting plate 45 is provided outside the air guide ring 43. The mounting plate 45 is connected to the frame 1. The first fan and the second fan are coaxially arranged inside the air guide ring 43. A protective net 44 is provided at the outer end of the air guide ring 43 away from the frame 1 to protect the first fan and the second fan. In this embodiment, the mounting plate 45 is bolted to the top of the frame 1 to fix the counter-cyclone fan 4 to the top of the frame 1.

[0039] Furthermore, such as Figure 2 and Figure 6As shown, the air source using the counter-rotating fan in this utility model also includes a first flow channel 7 and a second flow channel 8. The first flow channel 7 is disposed at one end of the support plate 2, and the end of the first flow channel 7 away from the support plate 2 is connected to one side of the frame 1. The second flow channel 8 is symmetrically disposed at the other end of the support plate 2, and the end of the second flow channel 8 away from the support plate 2 is connected to the other side of the frame 1. By setting the first flow channel 7 and the second flow channel 8, frost and water droplets falling on the support plate 2 can be discharged through the first flow channel 7 and the second flow channel 8.

[0040] Furthermore, such as Figure 2 and Figure 6 As shown, in order to facilitate the rapid discharge of frost and water droplets blown from the heat exchanger 3 onto the support plate 2, in this embodiment, the end of the support plate 2 near the first flow channel 7 and the end of the support plate 2 near the second flow channel 8 are both inclined.

[0041] The working principle of the air source using a counter-cyclone fan in this invention is as follows:

[0042] Under normal circumstances, the counter-cyclone fan 4 rotates to form an airflow along the first direction. The first fan rotates clockwise under the drive of the first motor, and the second fan rotates counter-clockwise under the drive of the second motor, forming high air pressure. This draws air from the mesh plate 5, flows through the heat exchanger 3, and then discharges from the top of the counter-cyclone fan 4, effectively preventing the cold air after heat exchange and cooling from continuously accumulating and settling, thus improving the air-side heat exchange efficiency. When the air source heat pump detects that the frost condition on the heat exchanger 3 has reached the preset condition, the heat pump unit operates in defrost mode. After the defrost mode has been running for a set time, the counter-cyclone fan 4 rotates to form an airflow along the second direction, causing the airflow direction to reverse. By blowing air onto the heat exchanger 3 through the counter-cyclone fan 4, the semi-melted frost layer or melted and condensed water droplets on the heat exchanger 3 can be blown off onto the support plate 2, thereby accelerating defrosting. After defrosting is completed, the air source heat pump stops the defrost mode, the counter-cyclone fan 4 rotates to form an airflow along the first direction, and the air source heat pump starts its normal operating mode.

[0043] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An air source heat pump using a counter-rotating fan, characterized in that: It includes a frame, a support plate is arranged on the frame, a heat exchanger is arranged on the support plate, and a counter-cyclone fan is also arranged on the frame. An air flow channel is formed between the counter-cyclone fan and the heat exchanger. The counter-cyclone fan rotates to form an air flow along a first direction to discharge the cold air generated around the heat exchanger. The counter-cyclone fan rotates to form an air flow along a second direction to blow the frost layer on the heat exchanger onto the support plate.

2. The air source heat pump using a counter-rotating fan according to claim 1, characterized in that: The counter-rotating fan rotates to form an airflow in a first direction opposite to the airflow in a second direction.

3. The air source heat pump using a counter-rotating fan according to claim 1, characterized in that: The counter-cyclone fan is arranged on the top of the frame. The counter-cyclone fan rotates to form an airflow along a first direction. The air flows upward through the heat exchanger along the side of the frame and is discharged from the top of the counter-cyclone fan. The counter-cyclone fan rotates to form an airflow along a second direction. The air flows downward through the heat exchanger and is discharged from the side of the frame, blowing the frost layer on the heat exchanger off onto the support plate.

4. The air source heat pump using a counter-rotating fan according to claim 1, characterized in that: The counter-rotating fan includes a first fan and a second fan, which are coaxially arranged on the top of the frame, the first fan is connected to a first motor, and the second fan is connected to a second motor, and the first motor controls the rotation direction of the first fan, which is opposite to the rotation direction of the second fan controlled by the second motor.

5. The air source heat pump using a counter-rotating fan according to claim 4, characterized in that: The first fan is provided with first blades, the second fan is provided with second blades, and the number of the first blades and the number of the second blades are mutually prime numbers.

6. The air source heat pump using a counter-rotating fan according to claim 4, characterized in that: The counter-rotating fans also include an air guide ring, in which the first fan and the second fan are coaxially arranged, and a protective net is arranged at one end of the air guide ring away from the outer side of the frame to protect the first fan and the second fan.

7. The air source heat pump using a counter-rotating fan according to claim 1, characterized in that: It also includes a first flow channel and a second flow channel. The first flow channel is arranged at one end of the support plate, and the end of the first flow channel away from the support plate is connected to one side of the frame. The second flow channel is symmetrically arranged at the other end of the support plate, and the end of the second flow channel away from the support plate is connected to the other side of the frame.

8. The air source heat pump using a counter-rotating fan according to claim 7, characterized in that: One end of the support plate close to the first flow channel and one end of the support plate close to the second flow channel are both inclined.

9. The air source heat pump using a counter-rotating fan according to claim 1, characterized in that: A bottom plate is also provided on the frame, the bottom plate and the support plate are spaced apart, a condenser, a compressor and a throttling device are provided between the bottom plate and the support plate, a panel is provided on the side between the bottom plate and the support plate, and a mesh plate is provided on the side between the support plate and the top of the frame.

10. The air source heat pump using a counter-rotating fan according to claim 1, characterized in that: There are multiple heat exchangers and multiple counter-cyclone fans.

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