JP6554665B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner such as an air conditioner provided with a cross flow fan.

  In general, a blower circuit for ventilating a main body casing having a suction port and a blower outlet is formed, a crossflow fan is provided in the blower circuit, and a heat exchanger is arranged in the vicinity of the upstream of the crossflow fan. 2. Description of the Related Art An air conditioner having an indoor unit that blows out air from an air outlet after exchanging heat through air that has been sucked from the air inlet by rotation of the air through a heat exchanger is known.

  Such an indoor unit includes a rear guider and a stabilizer in order to form an air flow generated by the rotation of the cross flow fan. By the way, as the air flow inside the cross flow fan, a flow that flows through the cross flow fan and blows out from the outlet (main flow) is generated between the cross flow fan and the stabilizer and circulates in a spiral shape at the tip of the stabilizer. There is a flow (vortex flow). And the mainstream blows off into a room | chamber interior from a blower outlet through the ventilation circuit comprised by a rear guider and a stabilizer.

  Here, as an example of a conventional indoor unit, an indoor unit 2 of an air conditioner 1 disclosed in Patent Document 1 will be described with reference to FIG. The air conditioner 1 forms a blower circuit 4 that ventilates the main body casing 3, and houses a heat exchanger 5 and a crossflow fan 6 that ventilates the heat exchanger 5 in the blower circuit 4. A rear guider 7 and a stabilizer 8 are provided in the vicinity of the fan 6, and the air outlet 9 is positioned above the bottom surface side of the main casing 3. By positioning the air outlet 9 above the bottom surface side of the main casing 3, it is aimed to improve the aesthetics by making it difficult to visually recognize the inside of the air outlet 9.

Japanese Patent Laying-Open No. 2015-68566

  However, in the air conditioner 1 according to Patent Document 1, in order to position the air outlet 9 above the bottom surface side of the main casing 3, the main flow blown out from the cross flow fan 6 is from the tongue 8 a of the stabilizer 8. It collides with the flat portion 8b of the stabilizer located between the blowout ports 9. As a result, as shown in FIG. 5, a stagnation point is generated due to the collision of the main flow with the flat portion 8 b of the stabilizer 8, the pressure rises locally, and the main flow flows from the cross flow fan 6 to the outlet 9. There is a possibility that the effective air passage is narrowed and the air blowing performance is deteriorated.

  The present invention has been made in view of the above-described conventional problems, and locally relieves a pressure increase caused by a stagnation point caused by a mainstream colliding with a planar portion of a stabilizer. An object of the present invention is to provide an air conditioner that can increase the amount of air to be ventilated.

An air conditioner according to the present invention includes a main body casing provided with a suction port and an air outlet, a blower circuit provided in the main body casing, a cross flow fan provided in the blower circuit, and a tongue portion. A stabilizer, a rear guider, and a heat exchanger, wherein the stabilizer has a first plane provided on the tongue side and a second plane provided on the outlet side, and the blower circuit The length of the first plane in the airflow direction is shorter than the length L2 of the second plane in the airflow direction.

  Thus, the main flow passing through the cross flow fan flows along the first plane between the tongue portion and the concave portion of the stabilizer, and then along the second plane between the concave portion and the stabilizer outlet side end. Smoothly rectifies the air flow direction. Thus, in the case where the gap between the stabilizer tongue and the stabilizer outlet side end is formed as a single plane, the main flow blown out from the cross flow fan is located between the stabilizer tongue and the outlet. Compared to collision with a flat part and a local increase in pressure that causes the main flow to flow from the cross-flow fan to the outlet, narrowing the effective air path, the local flow is more localized during the flow from the cross-flow fan to the outlet. Therefore, the amount of air that can be passed through the crossflow fan as the main flow without narrowing the effective air passage is increased without forming a region where the pressure rises.

  The air conditioner according to the present invention does not form a local pressure increase region while flowing from the cross flow fan to the blowout port, and the cross flow fan passes the main flow without narrowing the effective air passage. The amount of air that can be increased can be increased.

Sectional drawing which shows an example of a structure of the air conditioner which concerns on Embodiment 1 of this invention. The expanded sectional view which shows the stabilizer vicinity of the air conditioner which concerns on Embodiment 1 of this invention. The conceptual diagram which shows the pressure change in the ventilation circuit of the air conditioner which concerns on Embodiment 1 of this invention. Sectional drawing which shows the indoor unit of the conventional air conditioner Conceptual diagram showing pressure change in the blower circuit of a conventional air conditioner

  1st invention is a stabilizer provided with the main body casing provided with the suction inlet and the blower outlet, the ventilation circuit provided in the said main body casing, the crossflow fan provided in the said ventilation circuit, and the tongue part And a rear guider and a heat exchanger, and the stabilizer has a first plane provided on the tongue side and a second plane provided on the outlet side, and The air conditioner has an indented recess, and the length in the airflow direction of the first plane is shorter than the length L2 in the airflow direction of the second plane.

  According to this, the main flow that passes through the cross flow fan flows along the first plane between the tongue portion and the concave portion of the stabilizer, and then along the second plane between the concave portion and the stabilizer outlet side end. Smoothly rectify the airflow direction. As a result, the amount of air that can flow through the crossflow fan as the mainstream without narrowing the effective air passage without forming a region where the pressure rises locally while flowing from the crossflow fan to the outlet Can be increased.

  According to a second aspect of the present invention, in the air conditioner of the first aspect of the invention, in the cross section perpendicular to the rotation axis of the cross flow fan, the stabilizer passes through the stabilizer outlet side end, which is the end of the stabilizer on the outlet side. The straight line tangent to the tongue is the first straight line, and the first straight line intersects the outer circumference of the cross flow fan.

According to this, since the main flow that passes through the cross flow fan flows out in a direction substantially tangential to the outer periphery circle of the cross flow fan, in the blower circuit in which the first straight line intersects the outer periphery circle of the cross flow fan, Since the ratio of the airflow which goes to a recessed part increases among these, the airflow which passes along a 2nd plane through a recessed part from a 1st plane can be rectified more effectively. For this reason, the air quantity which a crossflow fan can ventilate as a mainstream can be increased.

  According to a third aspect of the present invention, in the air conditioner of the first or second aspect of the invention, in the cross section perpendicular to the rotation axis of the cross flow fan, the tangent of the outer circumference of the cross flow fan is perpendicular to the tongue. A straight line intersecting with the first tangent is defined as a first tangent, and the first plane is parallel to the first tangent.

  According to this, since the main flow flowing out in the substantially tangential direction of the outer peripheral circle of the cross flow fan does not collide with the first plane with the velocity component in the normal direction of the first plane, A local increase in pressure can be suppressed, and the amount of air that the crossflow fan can ventilate can be increased.

  In a fourth aspect of the present invention, in particular, in the air conditioner according to any one of the first to third aspects, the first plane and the tongue are tangent in a cross section perpendicular to the rotation axis of the cross flow fan. Is.

  According to this, the airflow that collides with the tongue portion of the main flow can smoothly flow to the first plane without disturbing the flow on the surface of the stabilizer, and the disturbance of the flow of the main flow can be mitigated, and the cross flow It is possible to increase the amount of air that is blown by the fan.

  In a fifth aspect of the present invention, in particular, in the air conditioner of any one of the first to fourth aspects of the invention, the cross section perpendicular to the rotation axis of the cross flow fan is between the first plane and the second plane. Are connected by arcs.

  According to this, the airflow flowing along the first plane out of the main flow can flow smoothly without disturbing the flow on the surface of the stabilizer when flowing to the second plane through the recess, and the mainstream air flow Turbulence can be mitigated, and the amount of air that the crossflow fan can ventilate can be increased.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment described below is an example, and the present invention is not limited to the embodiment.

(Embodiment 1)
The air conditioner 100 according to the present embodiment includes an outdoor unit (not shown) and an indoor unit 101 that are connected to each other through a refrigerant pipe. FIG. 1 is a cross-sectional view illustrating a configuration of an indoor unit 101 of an air conditioner 100 according to the present embodiment. FIG. 2 is an enlarged cross-sectional view showing the vicinity of the stabilizer 108 of the air conditioner 100 according to the present embodiment. 1 and 2 show a cross section of the cross flow fan 107 on a plane orthogonal to the central axis.

  As shown in FIG. 1, the indoor unit 101 includes a blower circuit 105 provided in a main body casing 104 having a suction port 102 and a blower outlet 103, and a heat exchanger 106 provided in the blower circuit 105. And a cross flow fan 107. The blower circuit 105 includes a stabilizer 108 and a rear guider 109.

  The suction port 102 is provided on the upper surface of the main body casing 104. The air outlet 103 is provided on the lower surface side of the main body casing 104. More specifically, the air outlet 103 is provided slightly above the lower surface of the main body casing 104.

The heat exchanger 106 heats or cools the air sucked from the suction port 102 by the cross flow fan 107 by heat exchange.

  The cross flow fan 107 is a blower that blows air taken in from the suction port 102 to the heat exchanger 106 and then blows the air into the room from the air outlet 103. The cross flow fan 107 is configured to be rotatable about a rotation axis which is a central axis provided in the lateral width direction of the main casing 104. The cross flow fan 107 has a configuration in which an end plate provided at an end portion and a plurality of fan bodies are connected in series. The fan body has a configuration in which a support plate is attached to at least one end of an impeller having a plurality of blades arranged in an annular shape.

  The stabilizer 108 is disposed below the heat exchanger 106 and below the cross flow fan 107. The rear guider 109 is disposed on the back side of the cross flow fan 107 so as to face the stabilizer 108.

  The stabilizer 108 and the rear guider 109 are for forming a flow of air generated by the rotation of the cross flow fan 107. The stabilizer 108 and the rear guider 109 constitute a blow-out side of the blower circuit 105 (downstream side of the cross flow fan 107) together with left and right walls (not shown).

  The stabilizer 108 is provided over the entire width of the main body casing 104 or the crossflow fan 107 in the central axis direction of the crossflow fan 107. The stabilizer 108 is provided in the vicinity of the downstream of the cross flow fan 107 and includes a tongue 108 a that stabilizes the vortex generated near the front of the cross flow fan 107.

  An upper surface 105 a connected to the air outlet 103 is provided between the stabilizer air outlet side end 108 d, which is the downstream end of the stabilizer 108, and the lower surface of the main body casing 104. The upper surface 105 a is bent with respect to the stabilizer 108.

  In addition, the “stabilizer” is located in the vicinity of the cross flow fan 107 and only the vicinity of the tongue portion 108 a having a curved surface shape for stabilizing the vortex generated near the front portion of the cross flow fan 107. In this specification, a wall portion (flat portion) that is located on the downstream side of the tongue portion 108a and that constitutes the upper side of the diffuser that bears the pressure recovery of the air conveyed by the crossflow fan 107 is also included. This is called “stabilizer”.

  The tongue 108 a is provided across the entire width of the main body casing 104 or the cross flow fan 107 in the central axis direction of the cross flow fan 107. The main portion of the tongue 108 a has the same cross-sectional shape in the direction perpendicular to the central axis of the cross flow fan 107 over the main body casing 104 or both ends of the cross flow fan 107. That is, the cross-sectional shape of the tongue portion 108a only needs to be the same in the main portion of the tongue portion 108a. For example, some cross-sectional shapes such as end portions near the left and right walls may be different.

  The cross section of the tongue portion 108 a is formed in a substantially arc shape that protrudes downward from the cross flow fan 107.

Hereinafter, the shape of the stabilizer 108 will be described. As shown in FIG. 2, the stabilizer 108 includes a recess 108 b with respect to the blower circuit 105. The recess 108b is provided over substantially the entire width of the stabilizer 108. The recess 108b includes a first flat surface 108c on the tongue portion 108a side and a second flat surface 108e on the air outlet 103 side. That is, the stabilizer 108 is composed of the tongue 108a, the first plane 108c, and the second plane 108e in this order from the upstream side. The first plane 108c and the second plane 108e constitute a recess 108b that is recessed from the blower circuit 105.

  The length L1 of the first plane 108c in the air flow direction and the length L2 of the second plane 108e in the air flow direction satisfy L1 <L2. In other words, the distance between the end of the tongue 108a on the first flat surface 108c side and the bottom of the recess 108b is shorter than the distance between the bottom of the recess 108b and the stabilizer outlet side end 108d. Assuming that a straight line tangent to the tongue 108a through the stabilizer outlet end 108d in the cross section in the direction orthogonal to the central axis of the cross flow fan 107 is a first straight line H1, the first straight line H1 is the outer circumference of the cross flow fan 107. Intersects with a circle. Further, if a straight line perpendicular to the tongue portion 108a among the tangent lines of the outer peripheral circle of the cross flow fan 107 is a first tangent line H2, the first plane 108c is parallel to the first tangent line H2.

  Further, the first plane 108c and the tongue 108a are tangent. The first plane 108c and the second plane 108e are connected by an arc. That is, the bottom part of the recessed part 108b is comprised by the curved surface.

  Next, the flow of air generated by the rotation of the cross flow fan 107 will be described. The cross flow fan 107 blows air in a substantially tangential direction of the outer circumference circle virtually connecting the outer peripheral ends of the blades, flows through the cross flow fan 107 and blown out from the outlet 103 (main flow), and the cross flow fan A flow (vortex flow) generated between 107 and the stabilizer 108 and circulating in a spiral shape is generated. The main flow and the vortex flow are separated from each other at the tip of the tongue portion 108a.

  In the main flow, when there is a flow that collides with the stabilizer 108 with a velocity component in the normal direction, as shown in FIG. 3, the air flow is applied to the blower circuit 105 other than the tongue portion 108 a serving as a boundary between the main flow and the vortex flow. A stagnation point is generated, and a pressure increase region is formed around the point. Therefore, of the main stream, the shape of the blower circuit 105 in which the ratio of the flow that collides with the stabilizer 108 with the velocity component in the normal direction increases, for example, the tongue of the stabilizer 108 among the tangent lines of the outer circumference of the cross flow fan 107 If the shape has a tangent line that intersects with a surface located on the downstream side of 108a, a stagnation point is generated in the blower circuit 105, a pressure rising region is formed around that point, and the crossflow fan 107 is ventilated. Air circulation will be hindered.

  However, in the air conditioner 100 according to the present embodiment, the stabilizer 108 includes the recess 108b with respect to the blower circuit 105, the first flat surface 108c between the tongue 108a and the recess 108b, and the recess 108b and the stabilizer. A second plane 108e is provided between the stabilizer outlet end 108d of 108, and the length L1 of the first plane 108c and the length L2 of the second plane 108e are formed such that L1 <L2. For this reason, in the region where the tangent of the outer circumference of the cross flow fan 107 intersects with the surface located on the downstream side of the tongue 108a of the stabilizer 108, the main flow passing through the cross flow fan 107 is along the first plane 108c. Then, the air flow direction is smoothly rectified along the second plane 108e. Thus, by making the shape of the stabilizer 108 an appropriate shape, the effective air passage is narrowed without forming a region where the pressure rises locally while flowing from the cross flow fan 107 to the blower outlet 103. Therefore, the amount of air that the cross flow fan 107 can ventilate as the main flow can be increased.

  In addition, since the first straight line H1, which is a straight line tangent to the tongue 108a through the stabilizer outlet end 108e, intersects with the outer circle of the cross flow fan 107, the tangent of the outer circle of the cross flow fan 107 is the stabilizer. It is a shape that always intersects with a surface located on the downstream side of the tongue portion 108a of the 108, and the proportion of the air flow toward the recess 108b in the main flow increases. For this reason, the airflow along the second plane 108e from the first plane 108c through the recess 108b can be rectified more effectively.

  Furthermore, the first tangent line H2 that is a straight line that intersects the tongue portion 108a perpendicularly among the tangent lines of the outer circumference circle of the cross flow fan 107 is parallel to the first plane 108c, so that it is substantially tangent to the outer circumference circle of the cross flow fan 107. The main flow flowing out in the direction does not collide with the first plane 108c with a velocity component in the normal direction of the first plane 108c. For this reason, a local increase in pressure in the first plane 108c can be suppressed, and the amount of air that the cross flow fan 107 ventilates can be further increased.

  Further, since the tongue 108a and the first plane 108c are tangent, and the first plane 108c and the second plane 108e are connected by an arc, the airflow that collides with the tongue 108a in the main flow is Smooth flow to the first plane 108c without disturbing the flow on the surface, and also smooth flow when flowing to the second plane 108e through the recess 108b, alleviating the disturbance of the mainstream air flow The amount of air that the cross flow fan 107 ventilates can be increased.

  Note that the configuration of the air conditioner 100 according to the present embodiment is particularly effective when the air blower circuit 105 bends from the inlet 102 to the outlet 103.

  Since the air conditioner according to the present invention can increase the amount of air that is passed through the crossflow fan, it is suitable for use in home air conditioning and commercial air conditioning.

DESCRIPTION OF SYMBOLS 100 Air conditioner 101 Indoor unit 102 Suction port 103 Outlet 104 Main body casing 105 Blower circuit 105a Upper surface 106 Heat exchanger 107 Crossflow fan 108 Stabilizer 108a Tongue 108b Recessed portion 108c First plane 108d Stabilizer outlet side end 108e Second plane 109 Rear guider L1 Length of first plane 108c L2 Length of second plane 108d H1 First straight line H2 First tangent

Claims (4)

A main body casing provided with a suction port and an air outlet, a blower circuit provided in the main body casing, a cross flow fan provided in the blower circuit, a stabilizer provided with a tongue, a rear guider, heat With an exchange,
The stabilizer is
A first plane provided on the tongue side and a second plane provided on the outlet side; and a recess recessed with respect to the blower circuit;
The length of the first plane of the air flow direction, the second plane of the airflow direction rather shorter than the length L2, and in a cross section perpendicular to the axis of rotation of the cross flow fan, the tangent of the outer circumference of the cross flow fan A straight line perpendicularly intersecting the tongue is a first tangent, and the first plane is parallel to the first tangent.
Air conditioner. In a cross section perpendicular to the rotation axis of the cross flow fan, a straight line that is tangent to the tongue portion through a stabilizer outlet side end that is an end portion on the outlet side of the stabilizer is defined as a first straight line, and the first straight line The air conditioner according to claim 1, wherein the air conditioner intersects with an outer circle of the cross flow fan. The air conditioner according to claim 1 or 2, wherein the first plane and the tongue portion are tangent in a cross section perpendicular to a rotation axis of the cross flow fan. The air conditioner according to any one of claims 1 to 3, wherein the first plane and the second plane are connected by an arc in a cross section perpendicular to a rotation axis of the cross flow fan.