Heat source unit of air heat pump

Abstract

A heat source unit (1) of an air heat pump has a housing (10), a fan (22) housed in the housing (10) and rotatable about a central axis (30), a bell mouth (32) having an opening (32), and a grille (40, 42) covering the opening (32). The grille (40, 42) comprises a plurality of longitudinal first louvers (46), where each of the first louvers (46) has an inlet portion (66) facing the fan (22), and at least the inlet portions (66) are inclined with respect to a central axis (30) of the fan (22), where the inclination angle (alpha) varies in the longitudinal direction of the respective first louvers (46).

Description

Technical Field

[0001] This disclosure relates to a heat source unit of an air heat pump, and more particularly to the construction of its grille. Background Technology

[0002] Typically, an air heat pump in its simplest form consists of a refrigerant circuit connecting a user-side heat exchanger, a compressor, a heat source heat exchanger, and an expansion valve, in which the refrigerant circulates to transfer heat or cold from the heat source heat exchanger to the user-side heat exchanger.

[0003] The heat source unit of this type of air heat pump is installed outdoors in most cases and includes a heat source heat exchanger for exchanging heat between outdoor air and refrigerant. To this end, the heat source unit includes a housing, a fan housed in the housing and rotatable about a central axis, and a bell mouth having an opening centered on the central axis of the fan to allow airflow generated by the fan to pass through and flow over the heat source heat exchanger.

[0004] To comply with industry standards and regulations, a grille or fan guard is provided that covers the opening of the horn and thus covers the fan blades of the fan.

[0005] For example, EP 3 705 732 A1 discloses such a heat source unit. The grille includes multiple horizontal louvers with significant depth in a direction parallel to the central axis of the fan, thereby visually concealing the fan when the grille is viewed at an angle relative to the central axis of the fan. As a result, the appearance is improved.

[0006] However, this significant depth creates more obstruction to the airflow generated by the fan, and thus generates more eddies. These eddies can produce noise that is considered negative, especially if the heat source unit is placed near a window. Summary of the Invention

[0007] In view of the above, one object of this disclosure is to provide a heat source unit for an air heat pump that operates more quietly while maintaining maximum airflow and limiting the visibility of the fan.

[0008] This objective is achieved by the heat source unit as defined in claim 1. Embodiments of this heat source unit are defined in the dependent claims.

[0009] Therefore, the present invention can be defined as a heat source unit of an air heat pump having a housing, a fan housed in the housing and rotatable about a central axis, a flared mouth having an opening centered on the central axis of the fan to allow airflow caused by the fan to pass through, and a grille covering the opening, the grille comprising a plurality of longitudinal first 100 blades having a first end, a second end opposite to the first end, and a center between the first end and the second end, wherein each of the first 100 blades has an inlet portion facing the fan, and at least the inlet portion is inclined relative to the central axis of the fan, wherein the inclination angle changes longitudinally in the respective first 100 blades, wherein in a first portion between the first end and the center, the inclination angle decreases from a positive maximum angle toward the first end and the center, and / or, in a second portion between the center and the second end, the inclination angle increases from a negative maximum angle toward the center and the second end.

[0010] According to a first aspect, the heat source unit of an air heat pump includes a housing and a fan housed within the housing and rotatable about a central axis. The heat source unit also includes a flared nozzle having an opening centered on the central axis of the fan to allow airflow generated by the fan to pass through. Furthermore, the heat source unit may include a heat source heat exchanger of the heat pump as described above, wherein the airflow generated by the fan passes through the opening of the flared nozzle and through the heat source heat exchanger to exchange heat / cooling capacity with refrigerant flowing through the heat source heat exchanger. To comply with industry standards and regulations, such as those concerning finger safety, the opening of the flared nozzle is covered by a grille. The grille, or at least a portion corresponding to the opening of the flared nozzle, includes a plurality of longitudinal first louvers. In this context, "first" is intended to distinguish between the first louvers and the second louvers in this disclosure, but does not necessarily imply the existence of two types of louvers. With this in mind, the "first louvers" may also be referred to as guide louvers, as they are designed to guide the airflow generated by the fan.

[0011] The 100th blade is longitudinal, having a longitudinal extension / direction defined between a first end and a second end opposite to the first end. A center is defined between the first end and the second end. Furthermore, the 100th blade has a depth perpendicular to the longitudinal extension and parallel to the central axis of the fan, and a height perpendicular to the longitudinal extension and the central axis of the fan.

[0012] Each of the 100th blades has an inlet portion facing the fan in its depth direction. In other words, the inlet portion extends from the fan edge facing the fan in a direction toward the outside of the heat source unit. At least the inlet portion is inclined relative to the central axis of the fan. In this context, "at least the inlet portion" includes embodiments in which only a portion of the 100th blade is inclined in the depth direction, and embodiments in which the entire 100th blade is inclined in the depth direction.

[0013] According to the first aspect, the tilt angle changes longitudinally along the corresponding hundredth blade. The tilt angle can be changed continuously or gradually along the longitudinal direction of the corresponding hundredth blade. Alternatively, the tilt angle can be changed stepwise (in increments).

[0014] In the first section between the first end and the center, the tilt angle decreases from its maximum positive angle toward the first end and the center. In other words, the tilt angle is maximum at a certain point between the first end and the center, and decreases from that point toward the first end and the center. In the first section, the tilt angle can decrease continuously or gradually from its maximum positive angle.

[0015] Alternatively or additionally, in the second portion between the center and the second end, the tilt angle increases from the negative maximum angle toward the center and the second end. In other words, the tilt angle is minimum at some point between the center and the second end, and increases from that point toward the center and the second end. In the second portion, the tilt angle can increase continuously or gradually from the negative maximum angle.

[0016] In other words, each of the first 100 blades is longitudinally twisted from the first end in a first rotational direction at a first angle (e.g., 0°) relative to the central axis of the fan to a maximum angle (positive maximum angle) relative to the central axis of the fan, and then returns from that maximum angle (positive maximum angle) in a second rotational direction opposite to the first rotational direction to a second angle (e.g., 0°) at the center relative to the central axis of the fan, and / or twisted from the center in a second rotational direction at a second angle (e.g., 0°) to a maximum angle (negative maximum angle), and then returns from that maximum angle (negative maximum angle) in the first rotational direction to a first angle (e.g., 0°) at the second end.

[0017] The absolute values ​​of the positive and negative maximum angles can be the same for the same 100th leaf, but can be different between two different 100th leafes (see below).

[0018] According to the first aspect, the 100th blade is at least partially tilted. It is presumed that the airflow vector varies radially depending on its position relative to the fan center, particularly within the airflow region of the fan defined by the two concentric rings. Therefore, the tilt angle changes longitudinally along the 100th blade. Thus, the tilt angle can correspond to the direction of the airflow (airflow vector) caused by the fan at the corresponding position on the 100th blade. In particular, the tilt angle can be substantially aligned with the airflow direction (airflow vector) at the corresponding position on the 100th blade.

[0019] Therefore, the louvers have less obstruction and instead guide airflow from the fan edge to the outer edge, thus reducing vortex generation. As a result, less noise is generated. Because of the low obstruction of the louvers, the fan can also operate at a lower RPM (revolutions per minute) while still achieving the same airflow rate, which further reduces noise. Therefore, a quieter heat source unit is obtained.

[0020] According to the second aspect, the tilt angle is 0° at the first and second ends and / or at the center. In other words, the first blade extends at its depth parallel to the central axis of the fan at the first and second ends and / or at the center.

[0021] According to a third aspect, the first hundred blades extend from one side of the grille to the opposite side of the grille. According to one embodiment, the first hundred blades can extend linearly from one side of the grille to the opposite side. The grille can be the front grille of a box-type heat source unit. In this case, the first hundred blades can extend horizontally (from left to right) or vertically (from bottom to top) from one side to the other. It is also contemplated that both horizontal and vertical louvers include the first hundred blades according to this disclosure. However, for ease of manufacture, it is preferable that either the horizontal or vertical louvers include the first hundred blades. In this context, and depending on the fan's rotation direction, the positive maximum angle can be located on one side (left / right or up / down), while the negative maximum angle can be located on the other side (right / left or down / up), i.e., the first end can be the left / right end or the up / down end, and the second end can be the right / left end or the down / up end. Alternatively, the grille can be the top grille of a top-blowing heat source unit. In this case, the first hundred blades can extend horizontally from one side to the other. Furthermore, in this case, the first hundred blades can extend horizontally from front to back and / or from left to right. Similarly, the positive maximum angle can be located on one side (left / right or front / back), while the negative maximum angle can be located on the other side (right / left or back / front). That is, the first end can be the left / right end or the front / back end, while the second end can be the right / left end or the back / front end.

[0022] According to the fourth aspect, the hundredth blade is arranged in parallel, and the positive and negative maximum angles are different among the hundredth blades in the arrangement direction of the blades. In the case of a box-type heat source unit, when the hundredth blade is a horizontal blade, the arrangement direction can also be referred to as the stacking direction.

[0023] According to the fifth aspect, the grille also includes a non-tilted, longitudinally oriented second hundredth blade. As mentioned above, the term "second" is used only to distinguish the second hundredth blade from the first hundredth blade. The second hundredth blade can also be simply referred to as a non-tilted louver. In particular, certain areas of the grille may have no or only very small airflow, so there is no need to provide a tilt angle. Instead, the second hundredth blade extends parallel to the central axis of the fan with its depth, and is therefore non-tilted.

[0024] According to the sixth aspect, the first hundred blades of the grille are symmetrical with respect to their tilt angle (tilt angle) relative to a first straight line extending through and perpendicular to the central axis of the fan and / or relative to a second straight line extending through and perpendicular to the central axis of the fan and the first straight line. It is presumed that the airflow generated by the fan is symmetrical, and so is the airflow vector. As previously mentioned, the tilt angle corresponds to the respective airflow direction (airflow vector). Therefore, preferably, the first hundred blades are also symmetrical with respect to their tilt angle.

[0025] In an alternative embodiment, the 100th blade is a radially extending louver that passes through the central axis of the fan. Specifically, the grille can be a circular grille or a circular portion having the 100th blade. In this context, radial extension also includes the 100th blade, which is curved in its longitudinal direction but extends radially outward from the center. The grille can have an even number of 100th blades. In this case, the 100th blade can be straight or curved, passing radially from one outer circumferential edge through the center to the opposite circumferential edge, with the positive maximum angle on one side and the negative maximum angle on the opposite side. The grille of this embodiment can also have identical 100th blades, each extending radially from the center to the outer circumferential edge. In this case, the 100th blade has a tilt angle that decreases from the positive maximum angle towards the first end and the center between the first end and the center. In other words, the tilt angle is maximum at a certain location between the first end and the center and decreases from that location towards the first end and the center. In the first portion, the tilt angle can decrease continuously or gradually from the positive maximum angle. Therefore, the grille can also have an odd number.

[0026] According to the eighth aspect, the 100th blade has a depth perpendicular to its longitudinal direction and parallel to the central axis of the fan, the depth being at least 15 mm, preferably at least 20 mm, and more preferably at least 25 mm. Therefore, the 100th blade has a sufficiently large depth to, on the one hand, visually conceal the fan when the grille is viewed at an angle relative to the central axis of the fan, and on the other hand, guide airflow to avoid generating turbulence, thereby preventing noise. In this context, a balance needs to be struck between a large depth that facilitates airflow guidance and a short depth that minimizes obstruction.

[0027] According to the ninth aspect, the hundredth blade has an outer edge facing the outside of the heat source unit and a opposing fan edge facing the fan, wherein, in a view parallel to the central axis of the fan, the fan edge is wavy, and / or, in a view parallel to the central axis of the fan, the outer edge is straight. The wavy shape of the fan edge allows for easy adaptation of the tilt angle to the corresponding airflow vector at the corresponding location, while allowing the grille to be injection molded. The straight outer edge provides a good visual appearance for the grille. The straight (e.g., parallel (horizontal) or concentric) relative positioning of the outer edges further promotes parallel laminar airflow, thereby reducing turbulence generation and thus reducing noise.

[0028] According to the tenth aspect, in a cross-section perpendicular to its longitudinal direction, the first and / or second blades have rounded fan edges facing the fan. The rounded fan edges offer less obstruction than a flat surface facing the fan, thereby reducing eddy current generation and thus noise.

[0029] According to the eleventh aspect, in a cross-section perpendicular to its longitudinal direction, the first and / or second blades have rounded outer edges facing the outside of the heat source unit. Due to the rounded outer edges, turbulence at the outer edges can be reduced, thereby reducing noise generation.

[0030] According to the twelfth aspect, the radius of curvature of the rounded fan edge is equal to or greater than the radius of curvature of the outer edge of the rounded corner. As a result, the first and second blades exhibit a teardrop or airfoil shape in a cross-section parallel to the central axis of the fan and perpendicular to its longitudinal extension. This teardrop shape reduces the generation of turbulence, thus providing a quieter heat source unit.

[0031] According to aspect thirteen, the grille has a central portion centered relative to the central axis of the fan, the central portion having a closed guide portion facing the fan, the guide portion being dome-shaped towards the fan. Due to the dome shape, the airflow at the center is guided to the hundredth blade, thereby avoiding a dead zone at the center. Furthermore, the closed guide portion conceals the central portion (hub) of the fan. Even further, the closed guide portion prevents airflow re-entry, which would cause additional turbulence inside the housing.

[0032] According to the fourteenth aspect, in a cross section perpendicular to its longitudinal direction and parallel to the central axis of the fan, the hundredth blade has an inlet portion and an outlet portion, wherein in the inlet portion the hundredth blade is inclined relative to the central axis of the fan, and in the outlet portion the hundredth blade is parallel to the central axis of the fan.

[0033] According to aspect fifteen, in a cross-section perpendicular to its longitudinal direction and parallel to the central axis of the fan, the hundredth blade is curved. In other words, the inlet and outlet portions are connected by a curve.

[0034] According to aspect sixteen, the fan is a propeller fan. A propeller fan differs from a turbo fan or Sirocco fan. A propeller fan is a simple form of fan, typically having an impeller with 3-6 blades made of metal sheet or resin, directly driven by a motor mounted in the airflow. Attached Figure Description

[0035] Embodiments of this disclosure are described below with reference to the accompanying drawings, in which:

[0036] Figure 1 This is a perspective view of the heat source unit according to the first embodiment.

[0037] Figure 2 This is a perspective view of the fan side of the grille in the first embodiment.

[0038] Figure 3 This is a front view of the grille in the first embodiment.

[0039] Figure 4 This is a rear view of the grille in the first embodiment.

[0040] Figure 5 A is the heat source unit in the first embodiment along... Figure 1 Cross-sectional view of line 5A-5A.

[0041] Figure 5 B is the heat source unit in the first embodiment. Figure 1 Cross-sectional view of line 5B-5B in the middle.

[0042] Figure 5 C is the heat source unit in the first embodiment. Figure 1 Cross-sectional view of line 5C-5C.

[0043] Figure 6 A to Figure 6 C is Figure 5 A to Figure 5 Cross-sectional view of a single grille of C.

[0044] Figure 7 This is a perspective front view of the grille in the second embodiment.

[0045] Figure 8 yes Figure 7 Side view of the grille.

[0046] Figure 9 This is a front view of the grille in the second embodiment.

[0047] Figure 10 This is a rear view of the grille in the second embodiment. Detailed Implementation

[0048] In the following description and accompanying drawings, the same reference numerals are used for the same or similar features throughout the embodiments.

[0049] Figure 1 A box-type heat source unit 1 for an air heat pump is shown. However, this disclosure can also be implemented in a top-blown heat source unit. The heat source unit 1 includes a housing 10 that houses components of the refrigerant circuit of the air heat pump, such as the heat source heat exchanger 20 previously described (shown in...). Figure 5 Other components of the refrigerant circuit and / or air heat pump may also be housed in the housing 10, such as the compressor, expansion valve, controller, or similar components (not visible).

[0050] The housing 10 includes a top plate 12, a bottom plate 14, and a right-side side plate 16. Plates 12, 14, and 16 may be made of sheet metal. The housing 10 may also include a back plate (not visible) that specifically covers a portion of the back of the heat source unit 1, particularly corresponding to the portion of the machine room in which other components of the refrigerant will be housed.

[0051] In a top view, the heat source heat exchanger 20 may be L-shaped, covering one side of the heat source unit opposite the side plate 16 (the shorter leg of the "L") and the remaining portion of the back of the heat source unit 1 (the longer leg of the "L"). In use, refrigerant flows through the heat source heat exchanger 20 to exchange heat / cooling with the air. In this context, the term "heat" in relation to the heat source heat exchanger 20 is used in a thermodynamic sense, meaning that "heat" is the amount of energy that spontaneously flows from one object to another due to a temperature difference, whether "heat" is transferred from the air to the refrigerant during heating operation or vice versa during cooling operation.

[0052] To allow air to flow through the heat exchanger 20, the housing 10 houses a fan 22, which in this embodiment is a propeller fan. A propeller fan is a relatively simple form of fan, typically having an impeller with 3 to 6 blades made of metal plate or resin, directly driven by a motor mounted in the airflow.

[0053] Fan 22 includes hub 24 coupled to motor 26 (see...) Figure 5 Multiple fan blades 28 are coupled to hub 24. Fan 22 can rotate about central axis 30 (rotation axis) by operation of motor 26.

[0054] Furthermore, the flare 32 is positioned in front of the fan 22, such that the fan 22 is positioned between the flare 32 and the heat source heat exchanger 20. The flare 32 has an opening 34, preferably a circular opening, centered on the central axis 30 of the fan 22.

[0055] When the fan 22 rotates, it causes airflow. Specifically, in this embodiment, air is drawn into the housing 10 through the heat exchanger 20 and blown out of the housing 10 through the opening 34 of the horn 32.

[0056] To meet industry standards and regulations, it is important that hands or fingers not be inserted into the fan. Therefore, a grille 40 is provided at the front of the housing 10, covering the opening 34 of the horn 32. The grille 40 can be made of resin and can be manufactured using an injection molding process.

[0057] In this embodiment, for aesthetic purposes, the grille 40 extends to the entire front of the housing 10 and includes a fan portion 42 configured to allow air to pass through the grille 40 and a machine compartment portion 44 with a closed surface that does not allow air to pass through and is primarily for design purposes. This disclosure is specifically directed to the construction of the fan portion 42. Therefore, when referring to the grille 40 in this disclosure, it means the fan portion 42 of the grille.

[0058] The grille 40 includes a plurality of first louvers 46 (also known as guide louvers or inclined louvers) and a plurality of second louvers 48 (also known as non-inclined louvers).

[0059] In this embodiment, the first louver 46 and the second louver 48 extend from one side 50 of the grille 40, or, in this particular embodiment, one side of the fan portion 42 (here, the left side), to the opposite side 52 of the grille 40, or, in this particular embodiment, the opposite side of the fan portion 42 (here, the right side). In this embodiment, the first louver 46 and the second louver 48 extend horizontally. A plurality of first louvers 46 and second louvers 48 are arranged parallel to each other in an arrangement direction (here, a stacking direction from bottom to top). The distance between adjacent louvers 46, 48 can be between 20 mm and 40 mm or between 25 mm and 35 mm.

[0060] The first 100-blade 46 and the second 100-blade 48 have a fan edge 56 facing the fan 22 and an outer edge 58 facing the outside of the heat source unit 1 (housing 10). As shown in the cross-section in the depth direction (perpendicular to the longitudinal extension, i.e., length and height), the first 100-blade 46 and the second 100-blade 48 may have rounded fan edges 56 and rounded outer edges 58. The radii of curvature of the rounded fan edges 56 and the rounded outer edges 58 may be the same. Alternatively, the radius of curvature of the rounded fan edges 56 may be greater than the radius of curvature of the rounded outer edges 58. As a result, the first and second 100-blades 46, 48 may have a cross-sectional shape similar to a teardrop or an airfoil.

[0061] Furthermore, for aesthetic purposes, the outer edges 58 of the first 100th blade 46 and the second 100th blade 48 can be flush. That is, they are located in a common plane (e.g., on a plane perpendicular to the central axis 30 of the fan 22, such as the sheath of a cylinder, the surface of a sphere, or a curved surface of the like).

[0062] The first 100th blade 46 and the second 100th blade 48 are longitudinal because their length L is the largest dimension compared to their depth D and height H. Since the first and second 100th blades 46 and 48 are flat or plate-shaped, their height H (thickness) is less than their depth D. The depth D, perpendicular to its longitudinal direction and parallel to the central axis 30 of the fan 22, can be at least 15 mm, at least 20 mm, or at least 25 mm. On the other hand, the depth D should not exceed 55 mm, 45 mm, or 35 mm. The height H can be no greater than 8 mm, no greater than 6 mm, or no greater than 5 mm. The height can vary along its depth. In particular, the height H can be greater on the fan edge side than on the outer edge side.

[0063] In a view parallel to the central axis 30 of fan 22, three distinct airflow regions A1, A2, and A3 are defined by concentric rings. The outer region A1 contains very little airflow or relatively low airflow velocity, while the central region A3 contains little to no airflow. Conversely, the middle region A2 contains high airflow velocity or relatively high airflow velocity. Regions A1 to A3... Figure 4 It is shown schematically in the middle.

[0064] The 100th blade 46 is mainly arranged in the area passing through the opening 32, and therefore in the airflow area with significant airflow velocity. In other words, the 100th blade 46 is mainly arranged in the central region A2. However, since the 100th blade 46 extends horizontally from one side of the grille 40 to the other side of the grille 40 (from left to right here), some of the 100th blade 46 will also pass through the central region A3.

[0065] The first blade 46 has a first end 60, a second end 62 opposite to the first end 60, and a center 64 between the first end 60 and the second end 62 along its longitudinal direction (length L). The center 64 may be centered relative to the central axis 30 of the fan 22.

[0066] Each of the hundredth blades 46 has an inlet portion 66 facing the fan 22 and an outlet portion 68 facing the outside of the heat source unit 1 / casing 10 in the depth direction.

[0067] In an embodiment not shown, the first blade 46 may be flat or plate-shaped and inclined relative to the central axis 30 of the fan 22. In other words, the line connecting the tip at the fan edge 56 and the tip at the outer edge 58 is straight, but inclined relative to the central axis 30 of the fan 22.

[0068] However, according to this disclosure, at least the inlet portion 66 is inclined relative to the central axis 30 of the fan 22.

[0069] Furthermore, it has been found that the direction of airflow approaching the fan edge 56 of the 100th blade 46 is different within the intermediate region A2.

[0070] First, the airflow velocity decreases towards the boundary between the outer region A1 and the central region A3, and the airflow approaches the fan edge 56 at a maximum angle, which is located midway between the boundaries of the outer region A1 and the central region A3. As a result, the angle at which the airflow approaches the fan edge 56 varies along the longitudinal direction of the corresponding first blade 46.

[0071] Secondly, the angle at which the airflow approaches the fan edge 56 can vary in the arrangement direction of the louvers. That is, when considering adjacent louvers at the same specific longitudinal position, the angle at which the airflow approaches the fan edge 56 at the specific longitudinal position of the corresponding louver can be different. Furthermore, the maximum angle at which the airflow approaches the fan edge 56 can vary in the arrangement direction of the louvers, i.e., between adjacent louvers.

[0072] A basic idea of ​​this disclosure is to tilt at least the inlet portion 66 of the first hundredth blade 46 so as to match the angle at which the airflow approaches the fan edge 56 and the tilt angle α in its longitudinal direction at the corresponding position of the respective first hundredth blade 46.

[0073] According to this embodiment, the tilt angle α changes longitudinally along the corresponding first 100-blade 46 (here it changes continuously or gradually, but it may also change in steps). Specifically, in the first portion 70 between the first end 60 and the center 64, the tilt angle α decreases from a positive maximum angle toward the first end 60 and the center 64. In the second portion 72 between the center 64 and the second end 62, the tilt angle α increases from a negative maximum angle toward the center 64 and the second end 62.

[0074] In this embodiment, the tilt angle α is 0° at the first end 60, the second end 62, and the center 64. In other words, the first blade 46 is flat or plate-shaped, and its depth (inlet portion and outlet portion 66, 68) is parallel to the central axis 30 of the fan 22 at the first end 60, the second end 62, and the center 64.

[0075] The absolute values ​​of the positive and negative maximum angles can be in the range of 24° to 60°, and preferably in the range of 35° to 55°.

[0076] Because the tilt angle α changes continuously along the longitudinal direction of the corresponding first blade 46, the fan edge 56 appears wavy in a view parallel to the central axis 30 of the fan 22 (see...). Figure 4).

[0077] To improve appearance, it may be beneficial if the outer edge 58 of the corresponding first blade 46 is straight (here horizontal) in a view parallel to the central axis 30 of the fan 22.

[0078] As previously mentioned, the angle at which the airflow approaches the fan edge 56 can vary in the arrangement direction of the first hundred blades 46. That is, when considering adjacent first hundred blades 46 at the same specific longitudinal position, the angle at which the airflow approaches the fan edge 56 at the corresponding specific longitudinal position of the first hundred blades 46 can be different. In order to also adapt the tilt angle α to the corresponding angle at which the airflow approaches the fan edge 56, the positive maximum angle and the negative maximum angle are different between the first hundred blades 46 (e.g., adjacent first hundred blades 46) in the arrangement direction of the first hundred blades 46.

[0079] Furthermore, it has been found that, due to the symmetry of fan 22, the angle at which the airflow approaches the corresponding fan edge 56 is also symmetrical, particularly in the intermediate region A2. Therefore, the configuration of the first blade 46 with respect to the tilt angle α is symmetrical with respect to a first straight line L1 extending through the central axis 30 of fan 22 and in a first direction perpendicular to the central axis 30 of fan 22, and / or with respect to a second straight line L2 extending through the central axis 30 of fan 22 and in a second direction perpendicular to both the central axis 30 and the first direction (see [link to relevant documentation]). Figure 4 In this embodiment, the structure of the first hundredth blade 46 is symmetrical with respect to the first and second straight lines L1 and L2.

[0080] Because of the construction of the hundredth blade 46 and its inclined inlet portion 66, which is adapted to the direction of airflow approaching the fan edge 56, turbulence and eddies can be minimized. Therefore, noise generation can be reduced. In addition, the hundredth blade 46 of this disclosure has low obstruction, so in order to achieve the same airflow through the heat source heat exchanger 20, the fan 22 can operate at a lower RPM, which also helps to provide a quiet heat source unit 1.

[0081] In this embodiment, only the inlet portion 66 of the first hundredth blade 46 is inclined, while the first hundredth blade 46 is parallel to the central axis 30 of the fan 22 in the depth direction at the outlet portion 68. As a result, the outer edges 58 of the first hundredth blade 46 and the second hundredth blade 48 are straight (horizontal in this case) and parallel to each other.

[0082] In order for the 100th blade 46 to provide a favorable airflow guiding function, they are curved in cross-section perpendicular to their longitudinal and vertical directions (see...). Figure 6 In other words, the inlet portion 66 and the outlet portion 68 are connected by the curved portion 78.

[0083] As previously mentioned, there is little or no airflow toward the grille 40 in the central region A1. To prevent air from re-entering the housing 10 through the grille 40 in this central region A1, the grille 40 (here, the fan portion 42) has a central portion 74 centered relative to the central axis 30 of the fan 22. In a view parallel to the central axis 30 of the fan 22, the central portion 74 may be circular.

[0084] The central portion 74 has a closed surface to prevent air from passing through it. As a result, the middle portion (hub 24) of the fan 22 is hidden and cannot be seen from the outside.

[0085] Furthermore, the central portion 74 has a dome-shaped guide portion 76 facing the fan 22, used to guide air into the openings in the grille 40. Therefore, dead zones and turbulence between the front of the hub 24 and the guide portion 76 can be effectively prevented.

[0086] When viewed in a direction parallel to the central axis 30 of the fan 22 (front view), the second 100 blades 48 are primarily located in the area outside the opening 34, at the top and bottom of the grille 40. Additional second 100 blades 48 can be provided within the area of ​​the opening 34, at the top and bottom of the grille 40 where the airflow velocity is relatively low.

[0087] The 200th blade 48 is flat or plate-shaped, with its depth extending parallel to the central axis 30 of the fan 22 and its length (longitudinal) extending perpendicular to the central axis 30 of the fan 22. The depth of the 200th blade 48 can be the same as the depth of the 100th blade 46.

[0088] The grille 40 also includes a third louver 54 extending perpendicularly to the first and second louvers 46, 48 (here, from the bottom plate 14 to the top plate 12). In this embodiment, the third louver 54 extends vertically. The depth of the third louver 54 is less than the depth of the first and second louvers 46, 48. Furthermore, in this embodiment, the third louver 54 is non-sloping, i.e., flat or plate-like. The primary purpose of the third louver 54 is to ensure the safety of fingers and children's fingers, i.e., to prevent people from touching the fan 22 with their fingers.

[0089] In the above embodiments, only the 100th blade 46 (horizontal blade) is inclined or has an inclined inlet portion. Therefore, manufacturing simplicity in the injection molding process can be maintained.

[0090] Alternatively, some of the third hundredth blades 54 may have the same construction as the first hundredth blade 46 in the above embodiments. In other words, the construction of the first hundredth blade 46 can be rotated 90 degrees and applied to the third hundredth blade 54.

[0091] In such Figures 7 to 10 In the second embodiment shown, this disclosure is applied to a circular grille 40.

[0092] In this embodiment, the first hundredth blade 46 extends radially. Although the radially extending first hundredth blade 46 has been shown as straight, it can also extend radially but be curved, as shown, for example, in EP 3 705 732 A1. Unlike the first embodiment, the absolute values ​​of the positive and negative maximum angles can be the same for all first hundredth blades 46 because, due to the radial arrangement of the first hundredth blades 46, the corresponding positions of the corresponding first hundredth blades 46 along their length L relative to the fan 22 and the corresponding airflow direction caused by the fan 22 will be the same.

[0093] The radially extending 100th blade is further connected by a concentric 300th blade 54.

[0094] The remainder of the second embodiment is the same as described above. Figures 1 to 6 The first embodiment is similar to or the same as the first embodiment.

[0095] List of reference numerals

[0096] 1 Heat source unit

[0097] 10. Outer shell

[0098] 12 Top Plate

[0099] 14. Base Plate

[0100] 16 side panels

[0101] 20 Heat source heat exchanger

[0102] 22 fans

[0103] 24-inch wheels

[0104] 26 Fan motors

[0105] 28 Fan blades

[0106] 30. Central axis (rotation axis)

[0107] 32 flared mouth

[0108] 34 Opening

[0109] 40 grille

[0110] 42 Fan Section

[0111] 44 Machine Room Section

[0112] 46 The Hundredth Leaf

[0113] 48 The 200th leaf

[0114] 50 One side of the grille

[0115] 52. Opposite sides of the grille

[0116] 54 The 300th leaf

[0117] 56 Fan edge

[0118] 58 Outer edge

[0119] 60 First End

[0120] 62 Second End

[0121] 64 Center

[0122] 66. Entrance Section

[0123] 68 Export Portion

[0124] 70 Part 1

[0125] 72 Part Two

[0126] 74 Central Part

[0127] 76 Guiding Section

[0128] 78. Bending section

[0129] L length

[0130] D Depth

[0131] H height

[0132] A1 Outer Area

[0133] A2 Middle Area

[0134] A3 Central Area

[0135] L1 First Straight Line

[0136] L2 Second Straight Line

Claims

1. A heat source unit (1) for an air heat pump, the heat source unit (1) comprising: Outer shell (10), A fan (22) housed in the housing (10) and capable of rotating about a central axis (30), A flared nozzle (32) having an opening (34) centered on the central axis (30) of the fan (22) to allow airflow generated by the fan (22) to pass through, and A grille (40, 42) covering the opening (34), the grille (40, 42) comprising a plurality of longitudinal first louvers (46), in, Each of the first louvers (46) has an inlet portion (66) facing the fan (22), and at least the inlet portion (66) is inclined relative to the central axis (30) of the fan (22). The tilt angle (α) changes longitudinally along the corresponding first louver (46). Each of the first louvers (46) has: In the first part (70), between the first end (60) of the corresponding first louver (46) and the center (64) centered relative to the central axis (30) of the fan (22), the tilt angle (α) decreases from a maximum positive angle toward the first end (60) and the center (64), and / or In the second part (72), between the center (64) and the second end (62) of the corresponding first louver (46), the tilt angle (α) increases from the negative maximum angle toward the center (64) and the second end (62).

2. The heat source unit (1) according to claim 1, wherein, The tilt angle (α) is 0° at the first end (60) and / or the second end (62) and / or at the center (64).

3. The heat source unit (1) according to claim 1 or 2, wherein, The first louver (46) extends from one side (50) of the grille (40, 42) to the other opposite side (52) of the grille (40, 42).

4. The heat source unit (1) according to any one of the preceding claims, wherein, The first louvers (46) are arranged in parallel, and the positive maximum angle and the negative maximum angle are different between the first louvers (46) in the arrangement direction of the first louvers (46).

5. The heat source unit (1) according to any one of the preceding claims, wherein, The grille (40, 42) also includes a non-inclined, longitudinal second hundredth blade (48).

6. The heat source unit (1) according to any one of the preceding claims, wherein, The first louver (46) of the grille (40, 42) is symmetrical with respect to a first straight line (L1) and / or a second straight line (L2) with respect to its tilt angle (α). The first straight line (L1) passes through the central axis (30) of the fan (22) and extends perpendicular to the central axis (30) of the fan (22). The second straight line (L2) passes through the central axis (30) of the fan (22) and extends perpendicular to the central axis (30) of the fan (22) and the first straight line (L1).

7. The heat source unit (1) according to claim 1 or 2, wherein, The first blade (46) is a first blade (46) that extends radially and passes through the central axis (30) of the fan (22).

8. The heat source unit (1) according to any one of the preceding claims, wherein, The first louver (46) has a depth (D) perpendicular to its longitudinal direction and parallel to the central axis (30) of the fan (22), the depth (D) being at least 15 mm, preferably at least 20 mm, and more preferably at least 25 mm.

9. The heat source unit (1) according to any one of the preceding claims, wherein, The first louver (46) has an outer edge (58) facing the outside of the heat source unit (1) and an opposing fan edge (56) facing the fan (22), wherein, in a view parallel to the central axis (30) of the fan (22), the fan edge (56) is wavy, and / or in a view parallel to the central axis (30) of the fan (22), the outer edge (58) is straight.

10. The heat source unit (1) according to any one of the preceding claims, wherein, The first blade (46) and / or the second blade (48) have rounded fan edges (56) facing the fan (22) in a cross section perpendicular to their longitudinal direction.

11. The heat source unit (1) according to any one of the preceding claims, wherein, The first blade (46) and / or the second blade (48) have rounded outer edges (58) facing the outside of the heat source unit (1) in a cross section perpendicular to its longitudinal direction.

12. The heat source unit (1) according to claims 10 and 11, wherein, The radius of curvature of the rounded fan edge (56) is equal to or greater than the radius of curvature of the rounded outer edge (58).

13. The heat source unit (1) according to any one of the preceding claims, wherein, The grille (40, 42) has a central portion (74) centered relative to the central axis (30) of the fan (22), the central portion (74) having a closed guide portion (76) facing the fan (22) in a dome shape.

14. The heat source unit (1) according to any one of the preceding claims, wherein, The first louver (46) has an inlet portion (66) and an outlet portion (68) in a cross section perpendicular to its longitudinal direction. In the inlet portion (66), the first louver (46) is inclined relative to the central axis (30) of the fan (22). In the outlet portion (68), the first louver (46) is parallel to the central axis (30) of the fan (22).

15. The heat source unit (1) according to claim 14, wherein, The first blade (46) is curved in a cross section perpendicular to its longitudinal direction.

16. The heat source unit (1) according to any one of the preceding claims, wherein, The fan (22) is a propeller fan.

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