Ultralow-temperature variable frequency cooling and heating machine

Abstract

This invention discloses an ultra-low temperature variable frequency cooling and heating unit, comprising a protective box and an upper air inlet pipe installed on the upper side of the protective box; a lower air inlet pipe installed on the lower side of the protective box; a heat exchange tube installed inside the protective box; an upper sealing plate; a movably connected upper sealing plate on the protective box; a movably connected lower sealing plate on the protective box; an upper air outlet pipe on the upper side of the protective box; a lower air outlet pipe on the lower side of the protective box; an upper baffle installed inside the upper air outlet pipe; a lower baffle installed inside the lower air outlet pipe; an adjusting rod installed on the protective box for controlling the switching of the upper air inlet pipe, lower air inlet pipe, upper air outlet pipe, and lower air outlet pipe; a plurality of sliders installed inside the protective box; and a fixing plate installed between the plurality of sliders. This invention achieves the initial turbulent airflow formed inside the protective box through the fixing plate, and then the turbulent airflow disrupts the boundary layer on the surface of the heat exchange tube, thereby achieving the mixing of hot and cold airflows and improving heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of air conditioning and heating systems, and more particularly to an ultra-low temperature variable frequency air conditioning and heating system. Background Technology

[0002] In existing technologies, ultra-low temperature variable frequency drives (VFDs) use a fan to draw in outside air, drawing it into the VFD. The air then comes into contact with the surface of heat exchange tubes through which refrigerant flows. The refrigerant absorbs heat from the air, transferring the heat and then delivering it to the room for heating. Conversely, when cooling is needed, the direction of refrigerant flow is changed to absorb heat from the indoor air, thus completing the heating and cooling operation. In existing technologies, the greatest resistance to heat exchange is the laminar sublayer (boundary layer, generally caused by excessive stability during gas flow) adhering to the surface of the heat exchange tubes. The presence of the laminar sublayer forms a static boundary layer on the surface of the heat exchange tubes. This static boundary layer prevents the cold / hot air from making sufficient contact with the surface of the heat exchange tubes, resulting in a reduction in heat exchange efficiency. Summary of the Invention

[0003] In order to overcome the shortcomings of existing technologies where the presence of a static boundary layer prevents cold / hot air from making sufficient contact with the surface of the heat exchange tube, thus reducing its heat exchange effect, this invention provides an ultra-low temperature variable frequency cooling and heating unit.

[0004] The technical solution is as follows: An ultra-low temperature variable frequency cooling and heating unit includes a protective box and an upper air inlet pipe installed on the upper side of the protective box; a lower air inlet pipe installed on the lower side of the protective box; a heat exchange pipe installed inside the protective box; an upper sealing plate; an upper sealing plate movably connected to the protective box; a lower sealing plate movably connected to the protective box; an upper air outlet pipe provided on the upper side of the protective box; a lower air outlet pipe provided on the lower side of the protective box; an upper baffle for sealing the upper air outlet pipe installed inside; a lower baffle for sealing the lower air outlet pipe installed inside; an adjusting rod for controlling the switching of the upper air inlet pipe, lower air inlet pipe, upper air outlet pipe, and lower air outlet pipe installed on the protective box; a plurality of sliders provided inside the protective box; and a fixing plate installed between the plurality of sliders.

[0005] Preferably, both the upper and lower air intake pipes are trapezoidal, and both have flared air inlets.

[0006] Preferably, the upper air intake pipe has an upper vent that communicates with the inside of the protective box at its rear side; the upper vent is sealed by an upper sealing plate; the lower air intake pipe has a lower vent that communicates with the inside of the protective box at its rear side, and the lower vent is sealed by a lower sealing plate.

[0007] Preferably, both the upper and lower sealing plates are rotatably connected to the protective box via a rotating shaft. The upper and lower surfaces of the adjusting rod are provided with racks. The rotating shaft has two through holes arranged vertically, and each of the two through holes is provided with a driven tooth that matches the rack.

[0008] Preferably, the upper baffle and the lower baffle are also rotatably connected to the protective box via a rotating shaft, and the rotation method of the two is consistent with the aforementioned rotation method of the upper sealing plate and the lower sealing plate.

[0009] Preferably, it also includes an upper spiral fan blade ring, a compression ring, a turbulence ring, a lower spiral fan blade ring, an airbag, and a cleaning sponge; several upper spiral fan blade rings are arranged horizontally on the fixed plate; an airbag is provided on the lower side of the upper spiral fan blade ring; a compression ring is fixedly connected to the inner side of the upper spiral fan blade ring; a turbulence ring for turbulent airflow is fixedly connected to the lower side of the compression ring; a cleaning sponge for rapid cleaning of condensate from the heat exchange tube is fixedly connected to the upper side of the turbulence ring; and a lower spiral fan blade ring is fixedly connected to the lower surface of the compression ring.

[0010] Preferably, the upper spiral fan blade ring is configured as a hollow structure and is connected to the air bladder, while the air bladder is configured to expand only towards the side closer to the heat exchange tube when inflated.

[0011] Preferably, the compression ring is made of plastic material with a certain deformation capability, with an annular opening on its upper side and a hollow structure inside, and the annular opening on its upper side is at the same horizontal height as the cleaning sponge.

[0012] Preferably, the airbag and the cleaning sponge are at the same horizontal level.

[0013] Preferably, the inner ring surface of the cleaning sponge is set to be in contact with the surface of the heat exchange tube.

[0014] The beneficial effects of the present invention are: the present invention achieves the initial turbulent airflow in the protective box through the fixed plate, and then the boundary layer on the surface of the heat exchange tube is destroyed by the turbulent airflow, thereby achieving the mixing of hot and cold airflow and improving heat exchange efficiency.

[0015] By changing the direction of air intake, the contact between the overly stable airflow and the surface of the heat exchange tube is avoided, thus preventing the formation of a stable laminar sublayer that would result in poor heat exchange performance.

[0016] By setting up a protective box, the heat exchange tubes can be effectively isolated from the external environment. Even when not in use or in severe weather, they can still provide protection and avoid damage.

[0017] Turbulence can effectively prevent dust adsorption. At the same time, the constantly changing airflow can effectively blow away and clean the dust adsorbed on the surface of the heat exchange tube, preventing it from accumulating under stable airflow conditions and affecting the heat exchange effect.

[0018] It allows for cleaning of heat exchange tubes without disassembly and effectively prevents wastewater from remaining inside the heating and cooling unit, thus improving cleaning efficiency and reducing costs.

[0019] The liquid water condensed on the surface of the heat exchange tubes is cleaned by a cleaning sponge, and further turbulence is achieved by using a continuously rotating turbulence ring to improve the heat exchange effect. Attached Figure Description

[0020] Figure 1 The ultra-low temperature variable frequency cooling and heating machine of the present invention Figure 1 3D structural diagram;

[0021] Figure 2 The ultra-low temperature variable frequency cooling and heating machine of the present invention Figure 2 3D structural diagram;

[0022] Figure 3 This is a cross-sectional view of the protective box of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the combination of the upper sealing plate and the upper air intake pipe of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the combination of the upper sealing plate, lower sealing plate, upper air outlet pipe and lower air outlet pipe of the present invention;

[0025] Figure 6 This is a front view of the combination of the upper and lower baffles of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the combination of the upper sealing plate and the adjusting rod of the present invention;

[0027] Figure 8 This is a three-dimensional structural diagram of the adjusting rod of the present invention;

[0028] Figure 9 This is a three-dimensional structural diagram of the combination of the adjusting rod and the fixing plate of the present invention;

[0029] Figure 10 This is a three-dimensional structural diagram of the lower adjustment block of the present invention;

[0030] Figure 11 This is a schematic diagram of the first partial three-dimensional structure of the present invention;

[0031] Figure 12 This is a schematic diagram of the second partial three-dimensional structure of the present invention.

[0032] Explanation of reference numerals in the attached diagram: 1-Protective box, 2-Upper air inlet pipe, 3-Lower air inlet pipe, 4-Heat exchange pipe, 101-Upper sealing plate, 102-Lower sealing plate, 103-Upper air outlet pipe, 104-Lower air outlet pipe, 105-Upper baffle, 106-Lower baffle, 107-Adjusting rod, 10701-Upper adjusting block, 10702-Lower adjusting block, 108-Slider, 109-Upper spiral fan blade ring, 1010-Squeezing ring, 1011-Break ring, 1012-Lower spiral fan blade ring, 1013-Airbag, 1014-Cleaning sponge, 1015-Fixing plate. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Example 1:

[0035] An ultra-low temperature inverter air conditioner, such as Figures 1-11 As shown, it includes a protective box 1 and an upper air inlet pipe 2; the upper air inlet pipe 2 is installed on the upper side of the protective box 1; the lower air inlet pipe 3 is installed on the lower side of the protective box 1; the heat exchange pipe 4 is installed inside the protective box 1; air is alternately introduced through the upper air inlet pipe 2 and the lower air inlet pipe 3, and the heat exchange pipe 4 is assisted in exchanging and absorbing heat from the gas.

[0036] It also includes an upper sealing plate 101, a lower sealing plate 102, an upper air outlet duct 103, a lower air outlet duct 104, an upper baffle 105, a lower baffle 106, an adjusting rod 107, a slider 108, and a fixing plate 1015; the upper air inlet duct 2 has an upper vent opening on its rear side that communicates with the interior of the protective box 1; the upper sealing plate 101 is movably connected to the protective box 1, and the upper vent opening is blocked by the upper sealing plate 101; the lower air inlet duct 3 has a lower vent opening on its rear side that communicates with the interior of the protective box 1; the lower air inlet duct 102 is movably connected to the protective box 1. The sealing plate 102 blocks the lower vent; the upper side of the protective box 1 is provided with an upper air outlet duct 103; the lower side of the protective box 1 is provided with a lower air outlet duct 104; an upper baffle 105 is installed inside the upper air outlet duct 103; a lower baffle 106 is installed inside the lower air outlet duct 104; an adjusting rod 107 is installed on the protective box 1; four sliders 108 are provided inside the protective box 1; a fixing plate 1015 is installed between the four sliders 108, and the fixing plate 1015 is made of lightweight plastic material.

[0037] Both the upper air inlet pipe 2 and the lower air inlet pipe 3 are trapezoidal, and both have flared inlets to accelerate gas flow, increase turbulence, and improve heat exchange efficiency.

[0038] The upper sealing plate 101 and the lower sealing plate 102 are rotatably connected to the protective box 1 via a rotating shaft. The upper and lower surfaces of the adjusting rod 107 are provided with racks. The rotating shaft has two vertically arranged through holes, and each of the two through holes is provided with a driven tooth that matches the rack. By moving the adjusting rod 107 up and down, the driven tooth is driven to rotate, thereby realizing the rotation of the upper sealing plate 101 and the lower sealing plate 102.

[0039] The upper baffle 105 and the lower baffle 106 are also rotatably connected to the protective box 1 via a rotating shaft, and their rotation method is consistent with the above-mentioned rotation method of the upper sealing plate 101 and the lower sealing plate 102.

[0040] Before starting work, this device is first installed at the air inlet of an existing ultra-low temperature heating and cooling inverter. In the existing technology, the ultra-low temperature heating and cooling inverter uses a fan to draw in outside air and bring it into the inverter. Then, the air comes into contact with the surface of the heat exchange tube 4, which contains refrigerant. The refrigerant then absorbs heat from the air, achieving heat transfer. Finally, through a series of processes, the heat is delivered to the room for heating. Conversely, when cooling is needed, the direction of refrigerant flow is changed to absorb heat from the indoor air, thus completing the entire heating and cooling operation. In the heat exchange process of the existing technology, the greatest resistance to heat exchange is the laminar sublayer (boundary layer, generally caused by excessive stability during gas flow) attached to the surface of the heat exchange tube 4. The presence of the laminar sublayer forms a static boundary layer on the surface of the heat exchange tube 4. The presence of the static boundary layer prevents cold / hot air from making sufficient contact with the surface of the heat exchange tube 4, resulting in a reduction in heat exchange efficiency.

[0041] To solve the above problems, when it is time to start using the device, first connect both the upper air inlet pipe 2 and the lower air inlet pipe 3 to the air inlet of the external fan. In the initial state, as follows: Figure 4 and Figure 5 As shown in the diagram, the upper air intake pipe 2 is connected to the inside of the protective box 1, while the lower air intake pipe 3 is not connected to the protective box 1. Simultaneously, as... Figure 6As shown, at this time, the upper air outlet duct 103 is covered by the upper baffle 105 and is not connected to the inside of the protective box 1, while the lower air outlet duct 104 is connected to the inside of the protective box 1. Therefore, when the outside airflow is delivered to the upper air inlet duct 2 by the fan, the air enters the protective box 1 from the upper air inlet duct 2 and then contacts the heat exchange tube 4 to achieve heat exchange. After the heat exchange is completed, the gas is discharged from the lower air outlet duct 104. During this process, when the airflow enters the protective box 1 and moves from top to bottom, the fixed plate 1015 moves downward under the action of the airflow, thereby causing the slider 108 to move downward inside the protective box 1. During the sliding process, due to the obstruction of the airflow by the fixed plate 1015, as the fixed plate 1015 moves downward, it can form a preliminary turbulent airflow in the protective box 1. This turbulent airflow then disrupts the boundary layer on the surface of the heat exchange tube 4, achieving mixing of hot and cold airflows and improving heat exchange efficiency. As the fixed plate 1015 continues to descend, when it reaches contact with the lower adjusting block 10702, the fixed plate 1015 pulls the lower adjusting block 10702 downward, causing the adjusting rod 107 to move downward synchronously. During this process, the adjusting rod 107... The rack on the upper surface of the adjusting rod 107 drives the driven gear on the shaft of the upper sealing plate 101 to rotate 90 degrees, thereby gradually sealing the gap between the upper air inlet pipe 2 and the protective box 1. At the same time, the rack on the lower surface of the adjusting rod 107 synchronously drives the driven gear on the shaft of the lower sealing plate 102 to rotate 90 degrees, thereby connecting the lower air inlet pipe 3 with the protective box 1. At this time, the outside airflow enters the interior of the protective box 1 through the lower air inlet pipe 3 and exchanges heat with the heat exchange tube 4. Meanwhile, the lower air outlet pipe 104 is blocked by the upper baffle 105, while the upper air outlet pipe 103 is open. This allows for the switching of the air intake direction, preventing overly stable airflow from contacting the surface of the heat exchange tube 4 and forming a stable laminar sublayer, which would result in poor heat exchange. Conversely, when airflow enters from the lower air intake pipe 3, the fixed plate 1015 is simultaneously blown upwards. When the fixed plate 1015 moves to contact the upper adjusting block 10701 and pushes the upper adjusting block 10701 upwards, the operation opposite to the aforementioned air intake and exhaust directions is completed, achieving a rapid switching of airflow. Compared to the stable and open airflow path in the prior art, this has a more efficient and stable heat exchange effect.

[0042] Furthermore, since the existing heat exchange tube 4 is installed inside the heating and cooling unit, it can directly contact the outside air. Under windy and rainy weather and long-term use, it will suffer obvious damage and dirt. Since the heat exchange tube 4 is mostly made of thin copper tubes with good heat exchange efficiency, it is prone to wear and deformation. Therefore, under direct contact with the outside air, long-term use can easily cause it to age, greatly shortening its service life. Therefore, this application can effectively isolate the heat exchange tube 4 from the external environment by setting up the protective box 1. It can still provide protection and avoid damage when not in use or in severe weather. At the same time, the operation of constantly changing the airflow path mentioned above can effectively prevent dust in the air from adhering to the surface of the heat exchange tube 4. The turbulence operation can effectively prevent dust in the air from adhering to the surface of the heat exchange tube 4. At the same time, the constantly changing airflow direction can effectively blow away and clean the dust adhering to the surface of the heat exchange tube 4, preventing it from accumulating under stable airflow conditions and affecting the heat exchange effect.

[0043] Meanwhile, in the existing technology, the outer surface of the heat exchange tube 4 needs to be cleaned periodically. This typically requires manual disassembly of the heat exchange tube 4, followed by wiping and other operations to remove dust. The disassembly process is cumbersome, and subsequent manual reassembly is also necessary. The entire process is time-consuming, labor-intensive, and extremely costly. To simplify the cleaning process and reduce its difficulty, this application proposes that when performing dust removal and other cleaning operations on the surface of the heat exchange tube 4, such as... Figure 5 As shown, by closing the lower air inlet pipe 3 and opening the upper air inlet pipe 2, cleaning water can be manually introduced into the protective box 1 through a water pipe. Then, the surface of the heat exchange tube 4 is briefly soaked and rinsed to clean and wash away the dust on its surface. At the same time, the wastewater after cleaning is discharged through the lower air outlet pipe 104. During normal air outlet use, the lower air outlet pipe 104 also needs to be connected to an external exhaust pipe to discharge the heat exchanged gas. At this time, the exhaust pipe only needs to be manually set outside the heat exchanger so that the wastewater can be discharged simultaneously. This achieves cleaning of the heat exchange tube 4 without disassembly and effectively prevents wastewater from remaining inside the heat exchanger, effectively improving cleaning efficiency and reducing costs.

[0044] Example 2:

[0045] Based on Example 1, such as Figure 10 and Figure 12As shown, it also includes an upper spiral fan blade ring 109, a compression ring 1010, a turbulence ring 1011, a lower spiral fan blade ring 1012, an airbag 1013, and a cleaning sponge 1014; several upper spiral fan blade rings 109 are arranged horizontally on the fixing plate 1015; an airbag 1013 is provided on the lower side of the upper spiral fan blade ring 109; a compression ring 1010 is fixedly connected to the inner side of the upper spiral fan blade ring 109, and the airbag 1013 is located on the upper side of the outer ring surface of the compression ring 1010; a turbulence ring 1011 is fixedly connected to the lower side of the compression ring 1010; a cleaning sponge 1014 is fixedly connected to the upper side of the turbulence ring 1011; and a lower spiral fan blade ring 1012 is fixedly connected to the lower surface of the compression ring 1010.

[0046] The upper spiral fan blade ring 109 is configured as a hollow structure and is connected to the air bag 1013. At the same time, the air bag 1013 is configured to expand only towards the side closer to the heat exchange tube 4 when it is filled with air.

[0047] The compression ring 1010 is made of plastic material with a certain deformation capability. It has an annular opening on its upper side and a hollow structure inside. The annular opening on its upper side is at the same horizontal height as the cleaning sponge 1014.

[0048] The airbag 1013 and the cleaning sponge 1014 are at the same horizontal level.

[0049] The inner ring surface of the cleaning sponge 1014 is set to be in contact with the surface of the heat exchange tube 4.

[0050] In the prior art, during the heat exchange process with air, when an external fan draws in air, the air may contain some moisture. Therefore, significant condensation occurs on the surface of the heat exchange tube 4, affecting the refrigerant's efficiency in absorbing heat from the air. To address this issue, when the airflow enters the protective casing 1 from the upper inlet pipe 2, the upper spiral fan blade ring 109 rotates synchronously under the influence of the airflow. Simultaneously, the upper spiral fan blade ring 109 also moves downwards along with the fixed plate 1015. During this process, to further enhance the turbulence effect and disrupt the laminar flow layer, the turbulence ring 1011 moves simultaneously with the upper spiral fan blade ring 109 as it rotates. The first step involves rotation, which further turbulence is achieved. Secondly, as the cleaning sponge 1014 moves downward, it cleans the liquid water condensed on the surface of the heat exchange tube 4. Simultaneously, when gas enters from the upper air inlet pipe 2, the gas enters the air bag 1013, causing the air bag 1013 to expand towards the side closer to the heat exchange tube 4. This causes the upper side of the compression ring 1010 to deform and come into contact with the air bag 1013, compressing it and cleaning the water absorbed inside the cleaning sponge 1014. During airflow conversion, i.e., when air enters through the lower air inlet pipe 3, the lower spiral fan blade ring 1012 is driven to rotate, achieving continuous turbulence and further improving the heat exchange effect.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-temperature variable frequency air conditioner, comprising a protective enclosure (1) and an upper air inlet pipe (2) installed on the upper side of the protective enclosure (1); a lower air inlet pipe (3) installed on the lower side of the protective enclosure (1); and a heat exchange pipe (4) installed inside the protective enclosure (1); characterized in that: It also includes an upper sealing plate (101); the upper sealing plate (101) is movably connected to the protective box (1); the lower sealing plate (102) is movably connected to the protective box (1); an upper air outlet pipe (103) is provided on the upper side of the protective box (1); and a lower air outlet pipe (104) is provided on the lower side of the protective box (1). An upper baffle (105) for sealing the upper air outlet pipe (103) is installed on the inside; a lower baffle (106) for sealing the lower air outlet pipe (104) is installed on the inside; an adjusting rod (107) for controlling the switches of the upper air inlet pipe (2), lower air inlet pipe (3), upper air outlet pipe (103) and lower air outlet pipe (104) is installed on the protective box (1); several sliders (108) are provided inside the protective box (1); a fixing plate (1015) is installed between the several sliders (108); An upper air inlet (2) is provided on the rear side of the upper air inlet pipe (2) and communicates with the interior of the protective box (1); the upper air inlet is blocked by the upper sealing plate (101); a lower air inlet is provided on the rear side of the lower air inlet pipe (3) and communicates with the interior of the protective box (1); the lower air inlet is blocked by the lower sealing plate (102). When in use, the upper air inlet pipe (2) and the lower air inlet pipe (3) are connected to the air inlet of the external fan. In the initial state, the upper air inlet pipe (2) is connected to the inside of the protective box (1), while the lower air inlet pipe (3) is not connected to the protective box (1). The upper air outlet pipe (103) is covered by the upper baffle (105) and is not connected to the inside of the protective box (1). The lower air outlet pipe (104) is connected to the inside of the protective box (1). When the external airflow is delivered to the upper air inlet pipe (2) by the fan, the air enters the protective box (1) from the upper air inlet pipe (2). When the air moves from top to bottom, the fixed plate (1015) moves downward under the action of the airflow, which causes the slider (108) to slide downward in the protective box (1).

2. The ultra-low temperature variable frequency cooling and heating unit according to claim 1, characterized in that: Both the upper air intake pipe (2) and the lower air intake pipe (3) are trapezoidal, and both air intakes are flared.

3. The ultra-low temperature variable frequency cooling and heating unit according to claim 1, characterized in that: The upper sealing plate (101) and the lower sealing plate (102) are rotatably connected to the protective box (1) through a rotating shaft. The upper and lower surfaces of the adjusting rod (107) are provided with racks. The rotating shaft has two through holes arranged vertically, and each of the two through holes is provided with a driven tooth that matches the rack.

4. The ultra-low temperature variable frequency cooling and heating unit according to claim 3, characterized in that: The upper baffle (105) and the lower baffle (106) are also rotatably connected to the protective box (1) via a rotating shaft, and their rotation method is consistent with the above-mentioned rotation method of the upper sealing plate (101) and the lower sealing plate (102).

5. The ultra-low temperature variable frequency cooling and heating unit according to claim 1, characterized in that: It also includes an upper spiral fan blade ring (109), a compression ring (1010), a turbulence ring (1011), a lower spiral fan blade ring (1012), an airbag (1013), and a cleaning sponge (1014); several upper spiral fan blade rings (109) are arranged horizontally on the fixed plate (1015); an airbag (1013) is provided on the lower side of the upper spiral fan blade ring (109); a compression ring (1010) is fixed to the inner side of the upper spiral fan blade ring (109); a turbulence ring (1011) for turbulence of airflow is fixed to the lower side of the compression ring (1010); a cleaning sponge (1014) for rapid cleaning of condensate vapor from the heat exchange tube (4) is fixed to the upper side of the turbulence ring (1011); and a lower spiral fan blade ring (1012) is fixed to the lower surface of the compression ring (1010).

6. The ultra-low temperature variable frequency cooling and heating unit according to claim 5, characterized in that: The upper spiral fan blade ring (109) is set to a hollow structure and is connected to the air bag (1013). At the same time, the air bag (1013) is set to expand only towards the side closer to the heat exchange tube (4) when it is filled with air.

7. The ultra-low temperature variable frequency cooling and heating unit according to claim 5, characterized in that: The compression ring (1010) is made of plastic material with a certain deformation capability. It has an annular opening on its upper side and a hollow structure inside. The annular opening on its upper side is at the same level as the cleaning sponge (1014).

8. The ultra-low temperature variable frequency cooling and heating unit according to claim 5, characterized in that: The airbag (1013) and the cleaning sponge (1014) are at the same horizontal height.

9. A low-temperature variable frequency cooling and heating unit according to claim 8, characterized in that: The inner ring surface of the cleaning sponge (1014) is set to be in contact with the surface of the heat exchange tube (4).

Images