High and low temperature all-in-one machine
By incorporating a combination of elastic plates and deformation sections inside the evaporator, and utilizing airflow to cause it to oscillate and vibrate, the problem of evaporator icing under low-temperature conditions in the high and low temperature integrated machine is solved, achieving more stable and efficient temperature control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-03-31
AI Technical Summary
Existing high and low temperature integrated machines are prone to frost or ice buildup on the evaporator surface under low temperature conditions, which leads to decreased heat exchange efficiency, increased flow resistance, increased energy consumption, and affects equipment stability and temperature control accuracy.
Elastic plates are installed inside the evaporator, and the airflow causes them to swing and vibrate, changing the airflow distribution on the surface of the heat exchange plate, breaking up local low-temperature areas, and enhancing the anti-icing capability through the design of the vibration and deformation sections of the elastic plates.
It effectively prevents the medium from condensing into frost or ice on the surface of the heat exchange plate, delays accumulation, improves the stability and reliability of the equipment in low-temperature environments, reduces energy consumption, and extends the equipment life.
Smart Images
Figure CN121764253A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of temperature control equipment technology, specifically a high and low temperature integrated machine. Background Technology
[0002] High and low temperature integrated systems are precision temperature control devices widely used in materials testing, battery charge and discharge simulation, and reactor temperature control. Their core function is to achieve rapid and stable temperature control over a wide temperature range, such as -70℃ to +150℃. These devices typically employ a composite system combining vapor compression refrigeration cycles and electric heating. Under low-temperature conditions, the evaporator surface temperature is far below the freezing point of the cooled medium, easily causing moisture or other components in the medium to condense on the evaporator heat exchange surface, gradually forming frost or even ice. Evaporator icing severely degrades heat exchange efficiency, increases flow resistance and system energy consumption, and can even lead to circulation interruptions due to ice blockage, requiring frequent shutdowns for de-icing, seriously affecting the continuous operation stability and temperature control accuracy of the equipment.
[0003] To address the aforementioned evaporator icing problem, existing technologies mainly employ the following two approaches, but both have significant shortcomings: The first category is passive or periodic de-icing solutions, the core of which is to address the issue after icing has occurred. The most common method is electric heating de-icing, which involves placing electric heating elements on the surface of the evaporator or near the flow channels. When an increase in the temperature difference at the evaporator outlet or abnormal pressure is detected, the heating elements are activated to melt the ice layer. This de-icing solution consumes a large amount of additional electrical energy, which contradicts the energy-saving design concept of the equipment. Furthermore, localized rapid heating may cause thermal stress on the evaporator materials and sealing structure, affecting its lifespan.
[0004] The second type is the anti-icing scheme based on refrigerant cycle regulation, which delays icing by optimizing system operating parameters. For example, the evaporation temperature and superheat can be changed by adjusting the opening of the electronic expansion valve. Although this type of scheme has a certain effect, it is limited by the fact that the anti-icing effect of the system parameter adjustment on local micro-icing is not direct or precise, and the response is delayed. Moreover, excessive adjustment in order to prevent icing will directly weaken the maximum cooling capacity of the equipment or the temperature control accuracy at low temperatures.
[0005] To address the aforementioned issues, this invention aims to propose a mechanical adaptive anti-icing solution integrated inside the evaporator, fundamentally improving the reliability, energy efficiency, and temperature control continuity of the high and low temperature integrated unit under low-temperature conditions. Summary of the Invention
[0006] The purpose of this invention is to provide a high and low temperature integrated machine to solve the problem that in existing high and low temperature integrated machines, the surface temperature of the evaporator is much lower than the freezing point of the medium being cooled under low temperature conditions. This easily leads to the condensation of moisture or other components in the medium on the heat exchange surface of the evaporator, which gradually forms a frost layer or even an ice layer. This deteriorates the heat exchange efficiency of the heat exchanger, increases flow resistance and system energy consumption, and even affects the continuous operation stability and temperature control accuracy of the equipment.
[0007] To achieve the above objectives, the present invention provides the following technical solution: A high and low temperature integrated unit includes an evaporator, which is a plate heat exchanger. The evaporator has multiple heat exchange plates arranged at equal intervals. Inside the evaporator, there is a first fluid channel for refrigerant flow and a second fluid channel for secondary refrigerant flow. The first and second fluid channels pass through the multiple heat exchange plates. An elastic sheet is provided between each pair of adjacent heat exchange plates. The upper and lower ends of the elastic sheet are fixedly connected to the heat exchange plates, and the middle part of the elastic sheet is in a movable state. The length of the elastic sheet is greater than the height of the heat exchange plates, and the thickness of the elastic sheet is 0.2-0.3 mm. An air outlet pipe is provided at the upper end of the evaporator, and multiple air outlets are provided at the lower end of the air outlet pipe. The air outlets correspond to the gaps between two adjacent heat exchange plates.
[0008] By installing an elastic plate between two adjacent heat exchange plates, with the middle of the elastic plate being movable, the airflow from the duct exits through the outlet and acts on the elastic plate. Since the length of the elastic plate is greater than the height of the heat exchange plate, and both ends of the elastic plate are fixedly connected to the heat exchange plate, and the middle of the elastic plate has a curvature, the elastic plate oscillates and vibrates under the force of the wind. This oscillation and vibration continuously changes the gap between the elastic plate and the adjacent heat exchange plates, resulting in a more uniform airflow distribution on the heat exchange plate surface. This effectively breaks up any potential localized low-temperature zones on the heat exchange plate surface, preventing moisture or other components in the medium from condensing into frost or ice. Simultaneously, the vibration of the elastic plate also generates a small mechanical force, which helps to break up and remove existing micro-frost or ice layers, further delaying their accumulation. This overcomes the shortcomings of existing technologies, such as high energy consumption and impact on equipment lifespan of passive or periodic de-icing solutions, as well as the indirect, imprecise, and delayed response of anti-icing solutions based on refrigerant circulation regulation, thus ensuring the stability of the high and low temperature integrated unit in low temperature environments.
[0009] Preferably, the elastic sheet has multiple arc-shaped protrusions on the two side walls facing the adjacent heat exchange plate. The multiple arc-shaped protrusions are equidistant in the vertical direction, and the openings of the multiple arc-shaped protrusions face upward.
[0010] By incorporating arc-shaped protrusions on the sidewalls of the elastic sheet, when the surface of the elastic sheet is subjected to wind, the upward-facing openings of the protrusions create a vortex effect as the airflow passes over them. This vortex effect further enhances the airflow disturbance on the surface of the elastic sheet, resulting in a more turbulent and uniform airflow distribution on the heat exchange plate surface. This turbulent airflow effectively prevents the prolonged presence of localized low-temperature areas, thus more effectively preventing the condensation of moisture or other components in the medium on the heat exchange plate surface. Simultaneously, the arc-shaped protrusions increase the contact area between the elastic sheet and the heat exchange plate. When the elastic sheet vibrates, it generates greater micro-mechanical forces, which more effectively break up and remove existing frost or ice layers, significantly slowing down the accumulation rate of frost or ice on the heat exchange plate surface and further improving the anti-icing performance of the high and low temperature integrated unit under low-temperature conditions.
[0011] Preferably, the elastic sheet includes a working section and a deformation section. The arc-shaped protrusion is provided on the working section. The deformation section has two segments. The two working sections are located on the upper and lower sides respectively. The working section is located between the two working sections, and the upper and lower ends of the working section are connected to the deformation sections on the upper and lower sides respectively. The deformation section is made of shape memory alloy, and the length of the deformation section increases when the ambient temperature decreases.
[0012] By configuring the elastic plate as a combination of a working section and a deformation section, with the deformation section made of a shape-memory metal alloy possessing special thermal expansion properties, the deformation section lengthens as the ambient temperature decreases, thereby causing corresponding deformation in the working section. This deformation allows the elastic plate as a whole to more actively adapt to temperature changes in low-temperature environments, further enhancing its vibration effect. When the ambient temperature drops, causing the evaporator surface temperature to decrease, the elongation of the deformation section increases the oscillation amplitude and frequency of the elastic plate, resulting in a more uniform airflow distribution on the heat exchange plate surface and more effectively disrupting any potential localized low-temperature zones, preventing the condensation of moisture or other components in the medium. Simultaneously, this characteristic of the deformation section also allows the elastic plate to maintain good anti-icing performance under different temperature conditions, improving the operational stability and reliability of the high-low temperature integrated unit across a wide temperature range. Furthermore, this design enhances the structural strength and durability of the elastic plate, enabling it to maintain stable performance under long-term vibration and temperature variations, extending the equipment's service life.
[0013] Preferably, the working section has multiple elastic protrusions on both sides of the arc-shaped protrusion, one end of which is fixedly connected to the working section, and the other end is in a free state.
[0014] Multiple elastic protrusions are installed on both sides of the working section. When the elastic sheet vibrates under wind force, these protrusions will reciprocate elastically. This elastic deformation further enhances the interaction force between the elastic sheet and the adjacent heat exchange plate, making the elastic sheet generate a stronger scraping and impact effect on the tiny frost or ice layer on the surface of the heat exchange plate during vibration, thus more effectively breaking and removing the frost or ice layer that has already formed. At the same time, the presence of elastic protrusions also increases the roughness of the heat exchange plate surface, changes the flow state of the airflow on the heat exchange plate surface, makes the airflow more turbulent, further disrupts the formation conditions of local low temperature zones, prevents moisture or other components in the medium from condensing on the surface of the heat exchange plate, and thus significantly improves the anti-icing capability of the high and low temperature integrated unit under low temperature conditions, ensuring the stable and efficient operation of the equipment in a wide temperature range.
[0015] Preferably, the air outlet is inclined, and the angle between the air outlet and the elastic sheet is 75° to 80°.
[0016] By setting the air outlet at an angle of 75°–80° with the elastic plate, the airflow exiting the outlet impacts the elastic plate at a suitable angle. This angled airflow more effectively induces the elastic plate to oscillate and vibrate. Compared to vertical impact, this angled airflow better stimulates the dynamic response of the elastic plate, allowing for more complete movement in both the horizontal and vertical directions, thus enhancing its ability to change the gap between itself and adjacent heat exchange plates. This results in a more uniform airflow distribution on the heat exchange plate surface, effectively breaking up any potential localized low-temperature zones and preventing moisture or other components in the medium from condensing into frost or ice. Simultaneously, this angled outlet optimizes the airflow path, reduces energy loss within the evaporator, improves airflow utilization efficiency, and further enhances the anti-icing performance and overall operating efficiency of the high-low temperature integrated unit under low-temperature conditions.
[0017] Preferably, the evaporator is provided with a guide groove on its lower side, the guide groove is inclined to the horizontal plane, and the bottom end of the guide groove is provided with a drain pipe, the drain pipe extending to the outside of the high and low temperature integrated machine.
[0018] By incorporating a flow guide channel at the bottom of the evaporator, inclined to the horizontal, moisture or melted ice-water mixture generated on the evaporator surface due to the anti-icing mechanism flows down the heat exchange plate and quickly collects at the bottom along the inclined channel. The inclined design of the channel utilizes gravity, allowing the liquid to flow naturally and quickly to lower areas, preventing liquid accumulation inside the evaporator. A drain pipe at the bottom of the channel further guides the collected liquid to the outside of the high-low temperature integrated unit, ensuring a dry internal environment. This design not only effectively prevents secondary icing caused by liquid accumulation but also maintains the cleanliness of the evaporator's interior, reducing potential corrosion and microbial growth due to residual moisture. This extends the equipment's lifespan and improves the overall performance and reliability of the high-low temperature integrated unit under low-temperature conditions.
[0019] Preferably, the surface of the working section is provided with a frosted coating, and the surface roughness of the frosted coating is greater than Ra25.
[0020] By applying a frosted coating to the surface of the working section, the surface roughness of the frosted coating (greater than Ra25) significantly enhances the friction between the elastic plate and adjacent heat exchange plates when the elastic plate vibrates under airflow. This enhanced friction allows the elastic plate to exert a stronger scraping effect on the tiny frost or ice layers on the heat exchange plate surface during vibration, helping to break up and remove existing frost or ice layers more quickly. Simultaneously, the rough surface of the frosted coating alters the airflow state on the heat exchange plate surface, generating more turbulence and eddies as the airflow passes over the elastic plate, further disrupting the formation conditions of localized low-temperature zones and preventing moisture or other components in the medium from condensing on the heat exchange plate surface. Furthermore, the frosted coating also possesses certain wear resistance and corrosion resistance, maintaining stable performance under long-term vibration and temperature variations, extending the service life of the elastic plate, and thus improving the anti-icing performance and overall operational stability of the high-low temperature integrated unit under low-temperature conditions.
[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides an elastic sheet between adjacent heat exchange plates inside the evaporator, with the middle part of the elastic sheet being movable. The airflow causes the elastic sheet to swing and vibrate, which effectively changes the airflow distribution on the surface of the heat exchange plate, breaks up local low-temperature areas, prevents the medium moisture or other components from condensing into frost or ice, and at the same time breaks up and removes the already formed small frost or ice layers, delaying their accumulation.
[0022] 2. This invention sets the elastic sheet as a combination of a working section and a deformation section. The deformation section is made of shape memory metal alloy, which can actively adapt to temperature changes in low-temperature environments, enhance vibration effect, make the airflow distribution on the heat exchange plate surface more uniform, effectively prevent medium condensation, improve the operating stability and reliability of the equipment in a wide temperature range, and also enhance the structural strength and durability of the elastic sheet.
[0023] 3. This invention incorporates arc-shaped protrusions on the working section. The vortex effect generated by these protrusions enhances airflow disturbance, resulting in a more turbulent and uniform airflow distribution on the heat exchange plate surface. This prevents prolonged periods of localized low-temperature areas and effectively prevents condensation of moisture in the medium. Simultaneously, the arc-shaped protrusions increase the contact area between the elastic sheet and the heat exchange plate, generating greater micro-mechanical forces during vibration, thus providing a stronger effect on breaking and removing frost or ice layers.
[0024] 4. This invention, by setting elastic protrusions on the working section, generates reciprocating elastic deformation with the vibration of the elastic sheet, further enhancing the interaction force with the heat exchange plate. This results in a stronger scraping and impact effect on frost or ice layers, and increases the surface roughness of the heat exchange plate, changing the airflow state, making the airflow more turbulent, disrupting the conditions for the formation of local low-temperature areas, preventing medium condensation, and significantly improving the anti-icing capability of the high and low temperature integrated machine under low-temperature conditions, ensuring the stable and efficient operation of the equipment in a wide temperature range. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the high and low temperature integrated machine of the present invention; Figure 2 This is a schematic diagram of the evaporator in the high and low temperature integrated machine of the present invention; Figure 3 This is a schematic diagram of the elastic sheet and air outlet pipe in this invention; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a full sectional view of the elastic sheet and the air outlet pipe in this invention.
[0026] In the diagram: 1. Evaporator; 2. Heat exchange plate; 3. Fluid channel 1; 4. Fluid channel 2; 5. Elastic sheet; 51. Working section; 52. Deformation section; 53. Frosted coating; 6. Air outlet duct; 7. Air outlet; 8. Arc-shaped protrusion; 9. Elastic protrusion; 10. Guide groove; 11. Drain pipe; 12. Shell; 13. Compressor; 14. Water outlet; 15. Water inlet; α. Exhaust angle. Detailed Implementation
[0027] Please see Figures 1 to 5 This invention provides a high and low temperature integrated machine, the technical solution of which is as follows: A high and low temperature integrated unit, please refer to Figures 1 to 5 The system includes a housing, a compressor 12, a housing 13, and an evaporator 1. The compressor 12, housing 13, and evaporator 1 are all fixedly installed inside the housing. The side wall of the housing has an inlet 15 and an outlet 14. The evaporator 1 is a plate heat exchanger, with multiple equidistant heat exchange plates 2. Inside the evaporator 1 is a first fluid channel 3 for refrigerant flow and a second fluid channel 4 for secondary refrigerant flow. The first fluid channel 3 and the second fluid channel 4 pass through the multiple heat exchange plates 2. The inlet 15 and the outlet 14 are respectively connected to the two ends of the second fluid channel 4. Each of the two adjacent heat exchange plates 2 is provided with an elastic sheet 5. The upper and lower ends of the elastic sheet 5 are fixedly connected to the heat exchange plate 2, and the middle part of the elastic sheet 5 is in a movable state. The length of the elastic sheet 5 is greater than the height of the heat exchange plate 2, and the thickness of the elastic sheet 5 is 0.2-0.3 mm. The upper end of the evaporator 1 is provided with an air outlet pipe 6, and the lower end of the air outlet pipe 6 is provided with multiple air outlets 7. The air outlets 7 correspond to the gaps between the two adjacent heat exchange plates 2. The air outlets 7 are inclined, and an air outlet angle α is set between the air outlets 7 and the elastic sheet 5. The air outlet angle α is 75°-80°. Multiple arc-shaped protrusions 8 are provided on the side walls of the adjacent heat exchange plates 2 facing the elastic sheet 5. The multiple arc-shaped protrusions 8 are equidistant in the vertical direction, and the openings of the multiple arc-shaped protrusions 8 face upward. The working section 51 has an arc-shaped protrusion 8 on each side wall, and multiple elastic protrusions 9 on each side wall. One end of each elastic protrusion 9 is fixedly connected to the working section 51, while the other end is free. The elastic sheet 5 includes the working section 51 and the deformation section 52. The arc-shaped protrusion 8 is located on the working section 51, and the deformation section 52 has two segments. The two working sections 51 are located on the upper and lower sides respectively, and the working section 51 is located between the two working sections 51. The upper and lower ends of the working section 51 are connected to the deformation sections 52 on the upper and lower sides respectively. The deformation section 52 is made of shape memory alloy, and the length of the deformation section 52 increases when the ambient temperature decreases. The surface of the working section 51 is covered with a frosted coating 53, and the surface roughness of the frosted coating 53 is greater than Ra25. Furthermore, the lower side of the evaporator 1 is provided with a guide channel 10, which is inclined to the horizontal plane. The bottom end of the guide channel 10 is provided with a drain pipe 11, which extends to the outside of the high and low temperature integrated machine.
[0028] Working principle: Please refer to Figures 1 to 5When the high and low temperature integrated unit is in low temperature operation, the evaporator 1 starts working. The refrigerant flows in the first fluid channel 3, and the secondary refrigerant flows in the second fluid channel 4. The two exchange heat through the heat exchange plate 2. At this time, the air outlet 6 begins to discharge air. Because the air outlet 7 is inclined and there is an air outlet angle α between it and the elastic plate 5 of 75° to 80°, the airflow impacts the elastic plate 5 at a suitable angle. After being acted upon by the airflow, the movable part of the elastic plate 5 begins to swing and vibrate. Because the length of the elastic plate 5 is greater than the height of the heat exchange plate 2, and its upper and lower ends are fixedly connected to the heat exchange plate 2, its swing and vibration can continuously change the gap size between it and the adjacent heat exchange plate 2, making the airflow distribution on the surface of the heat exchange plate 2 more uniform. This effectively destroys the possible local low temperature areas and prevents moisture or other components in the medium from condensing into frost or ice on the surface of the heat exchange plate 2. When moisture or melted ice-water mixture is generated on the surface of the evaporator 1 due to the anti-icing mechanism, these liquids flow down the surface of the heat exchange plate 2, quickly collect at the bottom along the inclined guide groove 10, and are then guided to the outside of the high and low temperature integrated machine through the drain pipe 11 at the bottom of the guide groove 10. This ensures that the internal environment of the evaporator 1 is dry, prevents secondary icing, keeps the interior clean, reduces corrosion and microbial growth, extends the service life of the equipment, and improves the overall performance and reliability of the equipment under low temperature conditions.
[0029] Meanwhile, the arc-shaped protrusions 8 on the sidewall of the elastic sheet 5 generate a vortex effect when airflow passes through, further enhancing airflow disturbance and making the airflow distribution on the surface of the heat exchange plate 2 more turbulent and uniform, preventing local low-temperature areas from persisting for a long time. Moreover, the arc-shaped protrusions 8 increase the contact area between the elastic sheet 5 and the heat exchange plate 2, generating greater micro-mechanical forces during vibration, which more effectively breaks down and removes existing frost or ice layers. The elastic protrusions 9 on the elastic sheet 5 undergo reciprocating elastic deformation during vibration, enhancing the interaction force with adjacent heat exchange plates 2, producing a stronger scraping and impact effect on the micro-frost or ice layers on the surface of the heat exchange plate 2, more effectively breaking down and removing the frost or ice layers. The elastic protrusions 9 also increase the surface roughness of the heat exchange plate 2, altering the airflow state, making the airflow more turbulent, and disrupting the conditions for the formation of local low-temperature areas.
[0030] The deformation section 52 is made of shape memory alloy, which lengthens as the ambient temperature decreases, causing the working section 51 to deform. This allows the elastic sheet 5 as a whole to more actively adapt to temperature changes in low-temperature environments, enhancing the vibration effect. When the ambient temperature drops, causing the surface temperature of the evaporator 1 to decrease, the deformation section 52 elongates, increasing the oscillation amplitude and frequency of the elastic sheet 5. This results in a more uniform airflow distribution on the surface of the heat exchange plate 2, more effectively breaking down localized low-temperature areas and preventing medium condensation.
[0031] The frosted coating 53 on the surface of the working section 51, with a surface roughness greater than Ra25, significantly enhances the friction between the elastic sheet 5 and the adjacent heat exchange plate 2 when the elastic sheet 5 vibrates. This generates a stronger scraping effect on the tiny frost or ice layers on the surface of the heat exchange plate 2, helping to quickly break up and remove the frost or ice layers. The rough surface of the frosted coating 53 can also change the airflow state, generating more turbulence and eddies, further disrupting the conditions for the formation of local low-temperature regions and preventing the medium from condensing.
[0032] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.
Claims
1. A high and low temperature all-in-one machine, characterized in that, The utility model provides an evaporator (1), the evaporator (1) is plate heat exchanger, the evaporator (1) is equipped with multiple heat exchange plates (2) of equidistance arrangement, evaporator (1) inside is equipped with one fluid channel (3) of circulating refrigerant and the fluid channel (4) of circulating secondary coolant, one fluid channel (3) and fluid channel (4) are through multiple heat exchange plates (2), and the elastic sheet (5) is arranged between the adjacent two heat exchange plates (2), the upper and lower ends of elastic sheet (5) are fixedly connected with heat exchange plate (2), and the middle part of elastic sheet (5) is active state, the length of elastic sheet (5) is greater than the height of heat exchange plate (2), and the thickness of elastic sheet (5) is 0.2~0.3mm, the upper end of evaporator (1) is equipped with air outlet pipe (6), the lower end of air outlet pipe (6) is equipped with multiple air outlets (7), and the air outlet (7) corresponds to the gap between the adjacent two heat exchange plates (2) respectively.
2. The high and low temperature integrated machine according to claim 1, characterized in that, Multiple arc protrusions (8) are arranged on the two side walls of the elastic sheet (5) facing the adjacent heat exchange plates (2), and the multiple arc protrusions (8) are equidistantly arranged in the vertical direction, and the openings of the multiple arc protrusions (8) face upward.
3. The high and low temperature integrated machine according to claim 2, characterized in that, The elastic sheet (5) comprises a working section (51) and a deformation section (52), the arc protrusions (8) are arranged on the working section (51), the deformation section (52) is provided with two sections, and the two working sections (51) are located on the upper and lower sides, respectively, the working section (51) is arranged between the two working sections (51), and the upper and lower ends of the working section (51) are connected with the upper and lower deformation sections (52), respectively, the deformation section (52) is made of a memory metal alloy, and the length of the deformation section (52) becomes longer when the ambient temperature decreases.
4. The high and low temperature integrated machine according to claim 3, characterized in that, Multiple elastic protrusions (9) are arranged on the two side walls of the working section (51) on which the arc protrusions (8) are arranged, one end of the elastic protrusion (9) is fixedly connected with the working section (51), and the other end is in a free state.
5. The high and low temperature integrated machine according to claim 1, wherein, The air outlet (7) is arranged obliquely, an air outlet angle (a) is arranged between the air outlet (7) and the elastic sheet (5), and the air outlet angle (a) is 25°-35°.
6. The high and low temperature integrated machine according to claim 1, wherein, A flow guide groove (10) is arranged on the lower side of the evaporator (1), the flow guide groove (10) is arranged obliquely with respect to the horizontal plane, the bottom end of the flow guide groove (10) is provided with a drain pipe (11), and the drain pipe (11) extends to the outside of the high-low temperature all-in-one machine.
7. The high and low temperature integrated machine according to claim 1, wherein, A ground coating (53) is arranged on the surface of the working section (51), and the surface roughness of the ground coating (53) is greater than Ra25.