Evaporation cooling industrial air conditioner indoor unit

Abstract

The utility model relates to the technical field of air conditioners, in particular to an evaporative cooling industrial air conditioner indoor unit which comprises a machine shell, an evaporator and an axial flow fan, the evaporator and the axial flow fan are arranged in the machine shell, an air inlet is formed in a back plate of the machine shell, the evaporator is installed at the air inlet, and the axial flow fan is installed at the front end of the machine shell through an installation plate. An air outlet guide plate is further mounted in front of the mounting plate; the axial flow fan comprises an axial flow type shell, a motor connected to the middle of the axial flow type shell and an impeller located in the middle of the axial flow type shell and driven by the motor to rotate. The impeller comprises a hub and five blades circumferentially arranged on the hub, the front edge of each blade is provided with a plurality of protrusions protruding from the windward side of the blade, the protrusions are arranged at intervals in the extending direction of the front edge, and each protrusion extends from the front edge of the blade to the rear edge of the blade. The top of each blade is provided with an air blocking coaming extending out of the blade in the air supply direction of the axial flow fan. The evaporative cooling industrial air conditioner indoor unit has the advantages of being long in air supply distance and low in noise.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an indoor unit for an evaporative cooling industrial air conditioner. Background Technology

[0002] Evaporative cooling industrial air conditioners are air conditioning units that integrate cooling, ventilation, dust prevention, and odor removal, and are increasingly being used in production workshops, public places, commercial and entertainment venues. Similar to traditional cabinet air conditioners, evaporative cooling industrial air conditioners also include indoor and outdoor units, and the entire system operates through a combination of water-cooled, air-cooled, and refrigerant-based refrigeration cycle systems.

[0003] The outdoor unit of an evaporative cooling industrial air conditioner uses a wet curtain evaporation method to cool the circulating water. After being cooled, the circulating water flows to the heat exchange system (at this point, the refrigerant-based refrigeration cycle system is already operating, compressing the refrigerant to a high-temperature, high-pressure state; the heat exchange system transfers heat from the refrigerant to the circulating water), thus carrying away the heat from the refrigerant and cooling it to room temperature. The room-temperature refrigerant then passes through an expansion valve and becomes a low-temperature, low-pressure refrigerant, which is then delivered to the evaporator in the indoor unit. A fan blows air onto the evaporator to create cool air. Utilizing this principle, the circulating water continuously carries away heat from the refrigerant, and the efficiency of heat removal is far higher than that of traditional air conditioners, resulting in a high energy efficiency ratio for the entire evaporative cooling industrial air conditioner.

[0004] In evaporative cooling industrial air conditioners, the air supply device generally uses axial flow fans or centrifugal fans. Axial flow fans have a larger air volume than centrifugal fans, thus providing better cooling effect with the same energy consumption, making them particularly suitable for larger workshops. However, current research and improvement of axial flow fan-based evaporative cooling industrial air conditioners mainly focus on reducing energy consumption and increasing air volume. As evaporative cooling industrial air conditioners are applied in more scenarios, the performance requirements for them are becoming increasingly stringent. Although axial flow fan-based evaporative cooling industrial air conditioners have a large air volume, their air delivery distance is relatively short. For example, in larger workshops where a longer air delivery distance is required, or in more modern workshops where noise reduction is more critical, current axial flow fan-based evaporative cooling industrial air conditioners generally suffer from short air delivery distances and high noise levels, thus failing to meet the needs of these scenarios. Utility Model Content

[0005] The purpose of this utility model is to provide an indoor unit for an evaporative cooling industrial air conditioner, which aims to solve the problems of short air delivery distance and high noise in the existing evaporative cooling industrial air conditioners.

[0006] To achieve the above objectives, this utility model provides an indoor unit for an evaporative cooling industrial air conditioner, which includes a casing and an evaporator and an axial flow fan disposed within the casing. The back plate of the casing has an air inlet, the evaporator is installed at the air inlet, and the axial flow fan is mounted at the front end of the casing via a mounting plate. An air outlet guide plate is also installed in front of the mounting plate, and the air outlet guide plate has a grille-type air outlet. The axial flow fan includes an axial flow housing, a motor connected to the middle of the axial flow housing, and an impeller located in the middle of the axial flow housing and driven to rotate by the motor. The impeller includes a hub and five blades circumferentially disposed on the hub. Each blade has multiple protrusions at its leading edge that protrude from the windward side of the blade. The multiple protrusions are spaced apart along the extension direction of the leading edge, and each protrusion extends from the leading edge to the trailing edge of the blade. Each blade tip has a wind deflector extending out of the blade in the direction of airflow from the axial flow fan.

[0007] Furthermore, both the leading and trailing edges of the leaf are arc-shaped, and the diameter of the circle corresponding to the leading edge is smaller than the diameter of the circle corresponding to the trailing edge. The arc length ⌒1 projected by the leaf tip onto the plane of rotation is 2.2-2.5 times the arc length ⌒2 projected by the leaf root onto the plane of rotation.

[0008] Furthermore, each blade has four protrusions on its leading edge. The length of the four protrusions increases as they move further away from the center of the impeller. The protrusions at the very front of each protrusion protrude the most from the blade and decrease as they move further back until they are flush with the blade.

[0009] Furthermore, the outer diameter of the impeller Φ1 is 350mm-380mm, the diameter of the hub Φ2 is 110mm-130mm, and the overall thickness of the impeller T1 is 70mm-80mm; the length of the outermost protrusion L1 is 27mm-30mm, the length of the innermost protrusion L2 is 24mm-27mm, and the height H1 of the front end of the protrusion protruding from the blade is 3mm-4mm; the height H2 of the wind deflector extending from the blade is 6mm-8mm.

[0010] Furthermore, the outer diameter of the impeller Φ1 is 360mm, the diameter of the hub Φ2 is 120mm, and the thickness of the impeller T1 is 75mm; the length of the outermost protrusion L1 is 29mm, the length of the innermost protrusion L2 is 26mm, and the height H1 of the front end of the protrusion protruding from the blade is 3.6mm; the height H2 of the wind deflector extending from the blade is 7.2mm.

[0011] Furthermore, the impeller blades are designed with the leading edge closer to the motor and the trailing edge further away from the motor. Both the windward and leeward sides of the blades are spherical, and the angle ∠1 between the line connecting the two ends of the blade tip and the plane of rotation is 30°-35°.

[0012] Furthermore, the angle ∠1 between the blade and the plane of rotation is 32°.

[0013] Furthermore, the mounting plate is provided with two mounting ports, one above the other, and each mounting port is equipped with an axial flow fan. The casing and the mounting plate form an inner cavity, which connects the air inlet and the two axial flow fans. The air outlet guide plate is provided with two grille-type air outlets, one above the other.

[0014] Furthermore, a partition plate is provided in the middle of the air outlet guide plate, which divides the space between the air outlet guide plate and the mounting plate into an upper air outlet space and a lower air outlet space.

[0015] This utility model provides an evaporative cooling industrial air conditioner indoor unit. Compared with the prior art, it features a protrusion on the leading edge of the impeller blades. When the blades rotate, the airflow on the windward side of the blades is impacted and cut by the protrusion, thus cutting off the stall cluster within the impeller flow channel. This effectively suppresses flow separation and secondary flow at the trailing edge, significantly increasing the total pressure and static pressure during operation. The increased static pressure leads to a longer air delivery distance for the axial flow fan. Simultaneously, the baffle plate guides the airflow, which would normally flow radially outward, forward along the impeller's axial direction, giving the airflow greater forward momentum. These features enable this impeller to meet the needs of long-distance air delivery. Furthermore, the reduced friction and collision between the stall cluster and the delivery airflow after cutting reduces the degree of impact on the blades, thereby lowering the noise level of the axial flow fan. Therefore, this evaporative cooling industrial air conditioner indoor unit offers the advantages of long air delivery distance and low noise. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the indoor unit of the evaporative cooling industrial air conditioner of this utility model;

[0017] Figure 2 This is an exploded structural diagram of the indoor unit of the evaporative cooling industrial air conditioner of this utility model;

[0018] Figure 3 This is a front view of the indoor unit of the evaporative cooling industrial air conditioner of this utility model, after the air outlet guide plate has been hidden.

[0019] Figure 4 This is the front view of an axial flow fan;

[0020] Figure 5 This is the front view of the impeller;

[0021] Figure 6 It is a three-dimensional structure of an impeller. Figure 1 ;

[0022] Figure 7 This is a side view of the impeller.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Housing; 11. Air inlet;

[0025] 2. Evaporator;

[0026] 3. Axial flow fan; 31. Axial flow casing; 32. Impeller; 321. Hub; 322. Blade; 323. Protrusion; 324. Wind deflector; 325. Leading edge; 326. Trailing edge; 327. Blade tip; 328. Blade root;

[0027] 4. Mounting plate; 41. Mounting port;

[0028] 5. Air outlet guide plate; 51. Grille-type air outlet; 52. Divider plate. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below.

[0030] In this embodiment, unless otherwise explicitly specified and limited, terms such as "set in," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through one or more intermediate media. Those skilled in the art can understand the specific meaning of these terms in this embodiment based on the specific circumstances. The directional terms appearing in this embodiment are for the purpose of better describing the characteristics of the features and the relationships between them. It should be understood that when the placement direction of this embodiment changes, the direction of the characteristics of the features and the relationships between them also changes accordingly. Therefore, directional terms do not constitute an absolute limitation on the characteristics of the features and the relationships between them in space, but only a relative limitation.

[0031] This embodiment provides an evaporative cooling industrial air conditioning indoor unit, such as... Figures 1 to 7 As shown, it includes a housing 1 and an evaporator 2 and an axial fan 3 disposed within the housing 1. An air inlet 11 is provided on the back plate of the housing 1, and the evaporator 2 is installed at the air inlet 11. The axial fan 3 is mounted on the front end of the housing 1 via a mounting plate 4. An air outlet guide plate 5 is also installed in front of the mounting plate 4, and the air outlet guide plate 5 is provided with a grille-type air outlet 51. As in the prior art, the housing 1 also contains devices such as a control circuit board, sensors, heat exchange kits, and a refrigerant-based refrigeration cycle system. However, these are all prior art, and the improvement of this application does not lie in the aforementioned devices. Therefore, the aforementioned devices and their connections are not described in this application.

[0032] In this embodiment, the axial flow fan 3 includes an axial flow housing 31, a motor (not shown in the figure, located behind the impeller 32) connected to the middle of the axial flow housing 31, and an impeller 32 located in the middle of the axial flow housing 31 and driven to rotate by the motor. The impeller 32 includes a hub 321 and five blades 322 arranged circumferentially around the hub 321. Each blade 322 has a plurality of protrusions 323 at its leading edge 325 that protrude from the windward side of the blade 322 (the side of the blade that impacts the airflow when the impeller rotates). The plurality of protrusions 323 are spaced apart along the extension direction of the leading edge 325. Each protrusion 323 extends from the leading edge 325 of the blade 322 to the trailing edge 326. Each blade 322 has a wind deflector 324 extending out of the blade 322 in the air supply direction of the axial flow fan 3 at its blade tip 327.

[0033] Based on the above structural configuration, this type of evaporative cooling industrial air conditioner indoor unit has a protrusion 323 on the leading edge 325 of the blades 322 of the impeller 32. When the blades 322 rotate, the airflow on the windward surface of the blades 322 is impacted and cut by the protrusion 323 to cut the stall cluster in the flow channel of the impeller 32. This can effectively suppress flow separation and secondary flow at the trailing edge 326, effectively improve the total pressure during operation, and the static pressure also increases accordingly. After the static pressure increases, the air delivery distance of the axial flow fan 3 will increase. At the same time, the baffle plate 324 can also guide the airflow that originally flows radially outward to flow axially forward along the impeller 32, giving the airflow greater forward momentum. The above makes this type of impeller 32 adaptable to the needs of long-distance air delivery. According to tests, under the same size, the air delivery distance of the axial flow impeller 32 in this embodiment is increased by 15%-20% compared with the conventional axial flow impeller. After the stall cluster is cut off, the friction and collision between it and the airflow are reduced, and the degree of collision with the blades 322 is also reduced, which in turn reduces the noise of the axial flow fan 3 during operation to a certain extent. According to the test, under the same size, the axial flow impeller 32 of this embodiment has a noise reduction of 3dB-5dB compared with the conventional axial flow impeller.

[0034] In this embodiment, each blade 322 has four protrusions 323 on its leading edge 325. The four protrusions 323 are configured to increase in length as they move further away from the center of the impeller 32. The protrusion of the front end of each protrusion 323 is the largest, and the protrusion decreases as it moves further back, until it is flush with the blade 322. The front end of the protrusion 323 protrudes the most from the windward side, which is the most effective at cutting through the stall cluster. The tail end of the protrusion 323 is flush with the windward side of the blade 322 to achieve a smooth transition. This configuration can minimize airflow resistance and improve the aerodynamic efficiency of the impeller 32.

[0035] In this embodiment, the leading edge 325 and trailing edge 326 of the blade 322 are both arc-shaped. The diameter of the circle corresponding to the leading edge 325 is smaller than the diameter of the circle corresponding to the trailing edge 326. The arc length ⌒1 projected by the blade tip 327 of the blade 322 onto the plane of rotation is 2.2-2.5 times the arc length ⌒2 projected by the blade root 328 onto the plane of rotation. Preferably, the outer diameter Φ1 of the impeller 32 is 350mm-380mm, more preferably Φ1 is 360mm; the diameter Φ2 of the hub 321 is 110mm-130mm, more preferably Φ2 is 120mm; the overall thickness T1 of the impeller 32 is 70mm-80mm, more preferably T1 is 75mm; the length L1 of the outermost protrusion 323 is 27mm-30mm, more preferably L1 is 29mm; the length L2 of the innermost protrusion 323 is 24mm-27mm, more preferably L2 is 26mm; the height H1 of the foremost point of the protrusion 323 protruding from the blade 322 is 3mm-4mm, more preferably H1 is 3.6mm; the height H2 of the baffle plate 324 extending from the blade 322 is 6mm-8mm, more preferably H2 is 7.2mm. The above parameters are preferred dimensional parameters, and the axial flow fan 3 performs better within these parameter ranges.

[0036] In this embodiment, the blades 322 of the impeller 32 are configured such that the leading edge 325 is closer to the motor and the trailing edge 326 is farther away from the motor. The windward and leeward sides (the side of the blade opposite to the windward side) of the blades 322 are both spherical. The spherical windward side has a better effect on pushing the airflow forward. The angle ∠1 between the line connecting the two ends of the blade tip 327 and the plane of rotation is 30°-35°, and preferably ∠1 is 32°.

[0037] In this embodiment, the mounting plate 4 has two mounting ports 41, one above the other, each mounting port 41 housing an axial flow fan 3. The casing 1 and the mounting plate 4 form an inner cavity, which connects the air inlet 11 and the two axial flow fans 3. The air outlet guide plate 5 has two grille-type air outlets 51, one above the other. Based on the above structural configuration, this type of evaporative cooling industrial air conditioner indoor unit can selectively operate in the modes of upward air supply, downward air supply, and simultaneous upward and downward air supply, adjusting the air supply height and air volume as needed. More preferably, a partition plate 52 is provided in the middle of the air outlet guide plate 5, dividing the space between the air outlet guide plate 5 and the mounting plate 4 into an upper air outlet space and a lower air outlet space. The partition plate 52 prevents air from being delivered from the grille-type air outlet 51 at the other height when only one height needs to supply air.

[0038] In summary, this type of evaporative cooling industrial air conditioner indoor unit has the advantages of long air delivery distance and low noise.

[0039] Where there is no conflict, the above embodiments and features can be combined with each other.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the preferred technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of this utility model.

Claims

1. An indoor unit for an evaporative cooling industrial air conditioner, characterized in that: The device includes a casing (1) and an evaporator (2) and an axial fan (3) disposed within the casing (1). An air inlet (11) is provided on the back plate of the casing (1). The evaporator (2) is installed at the air inlet (11). The axial fan (3) is mounted on the front end of the casing (1) via a mounting plate (4). An air outlet guide plate (5) is also installed in front of the mounting plate (4). The air outlet guide plate (5) is provided with a grille-type air outlet (51). Its characteristic feature is that: The axial flow fan (3) includes an axial flow housing (31), a motor connected to the middle of the axial flow housing (31), and an impeller (32) located in the middle of the axial flow housing (31) and driven to rotate by the motor. The impeller (32) includes a hub (321) and five blades (322) arranged around the hub (321). Each blade (322) has multiple protrusions (323) protruding from the windward side of the blade (322) at its leading edge (325). The multiple protrusions (323) are spaced apart along the extension direction of the leading edge (325). Each protrusion (323) extends from the leading edge (325) of the blade (322) to the rear edge (326). Each blade (322) has a wind deflector (324) extending out of the blade (322) in the direction of airflow of the axial flow fan (3) at its tip (327).

2. The indoor unit of the evaporative cooling industrial air conditioner according to claim 1, characterized in that: The leading edge (325) and trailing edge (326) of the blade (322) are both arc-shaped. The diameter of the circle corresponding to the leading edge (325) is smaller than the diameter of the circle corresponding to the trailing edge (326). The arc length ⌒1 of the leaf tip (327) projected onto the plane of rotation is 2.2-2.5 times that of the arc length ⌒2 of the leaf root (328) projected onto the plane of rotation.

3. The indoor unit of the evaporative cooling industrial air conditioner according to claim 1, characterized in that: Each blade (322) has four protrusions (323) on its leading edge (325). The four protrusions (323) are set to be longer the further away from the center of the impeller (32). The front end of each protrusion (323) protrudes the most from the blade (322), and the height protruding from the blade (322) decreases as it moves further back, until it is flush with the blade (322).

4. The indoor unit of the evaporative cooling industrial air conditioner according to claim 3, characterized in that: The outer diameter Φ1 of the impeller (32) is 350mm-380mm, the diameter Φ2 of the hub (321) is 110mm-130mm, and the overall thickness T1 of the impeller (32) is 70mm-80mm. The length L1 of the outermost protrusion (323) is 27mm-30mm, the length L2 of the innermost protrusion (323) is 24mm-27mm, and the height H1 of the front end of the protrusion (323) protruding from the blade (322) is 3mm-4mm. The height H2 of the windbreak panel (324) extending beyond the blade (322) is 6mm-8mm.

5. The indoor unit of the evaporative cooling industrial air conditioner according to claim 4, characterized in that: The outer diameter Φ1 of the impeller (32) is 360mm, the diameter Φ2 of the hub (321) is 120mm, and the thickness T1 of the impeller (32) is 75mm; The length L1 of the outermost protrusion (323) is 29 mm, the length L2 of the innermost protrusion (323) is 26 mm, and the height H1 of the front end of the protrusion (323) protruding from the blade (322) is 3.6 mm. The height H2 of the windbreak panel (324) extending beyond the blade (322) is 7.2 mm.

6. The indoor unit of the evaporative cooling industrial air conditioner according to claim 1, characterized in that: The blades (322) of the impeller (32) are configured such that the leading edge (325) is closer to the motor and the trailing edge (326) is farther away from the motor. The windward and leeward sides of the blades (322) are both spherical. The angle ∠1 between the line connecting the two ends of the blade tip (327) and the plane of rotation is 30°-35°.

7. The indoor unit of the evaporative cooling industrial air conditioner according to claim 6, characterized in that: The angle ∠1 between the blade (322) and the plane of rotation is 32°.

8. The indoor unit of an evaporative cooling industrial air conditioner according to any one of claims 1 to 7, characterized in that: The mounting plate (4) has two mounting ports (41) at the top and bottom, and each mounting port (41) is equipped with an axial flow fan (3). The casing (1) and the mounting plate (4) form an inner cavity, which connects the air inlet (11) and the two axial flow fans (3). The air outlet guide plate (5) is equipped with two grille-type air outlets (51), one above the other.

9. The indoor unit of the evaporative cooling industrial air conditioner according to claim 8, characterized in that: A partition plate (52) is provided in the middle of the air outlet guide plate (5). The partition plate (52) divides the space between the air outlet guide plate (5) and the mounting plate (4) into an upper air outlet space and a lower air outlet space.

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