JP7479453B2 - Air Conditioning Equipment - Google Patents

Description

The present disclosure relates to an air conditioning device having a centrifugal blower.

Some conventional air conditioners have a centrifugal blower with a heat exchanger and scroll casing between the air intake and air outlet. In the air conditioner, the fan housed in the scroll casing rotates, causing air drawn in from the air conditioner's intake to flow into the fan along a bellmouth formed at the intake port of the scroll casing. The airflow discharged from the fan is pressurized within the scroll casing, discharged from the scroll casing, passes through the heat exchanger, and is then discharged from the air conditioner's outlet into the space to be air-conditioned.

Scroll casings used in air conditioners are sometimes split into two parts to house a fan. Scroll casings split into two parts have a split section where the two parts are joined to a member that constitutes the discharge port of the scroll casing, taking ease of manufacture into consideration, and also have a further split section on the opposite side of the suction port of the scroll casing (see, for example, Patent Document 1). The air conditioner of Patent Document 1 also has fixing sections provided on the wall surface of the scroll casing near each split section to fix the two split parts to each other.

JP 2005-69177 A

However, the speed of the airflow flowing into the suction port of the scroll casing is greater on the suction port side of the air conditioning unit. Therefore, in the air conditioning unit of Patent Document 1, the fixed part provided on the suction port side of the air conditioning unit interferes with the airflow, causing separation of the airflow flowing through the bellmouth, which can reduce the volume of gas flowing into the scroll casing.

The present disclosure is intended to solve the problems described above, and aims to obtain an air conditioning device that suppresses a reduction in the volume of gas flowing into the scroll casing of a centrifugal blower.

The air conditioner according to the present disclosure includes a centrifugal blower including a rotationally driven fan and a scroll casing in which the fan is housed and which has a peripheral wall formed in a spiral shape and a side wall provided with an air inlet, a drive source that applies driving force to the fan, a heat exchanger arranged in a position facing an air outlet formed in the scroll casing, and a housing in which the centrifugal blower, the drive source and the heat exchanger are housed and which has a partition plate that separates the interior into an air blowing chamber in which the fan is disposed and a heat exchange chamber in which the heat exchanger is disposed, the housing being formed with a housing inlet through which air flowing into the air blowing chamber passes and a housing outlet through which air flowing out of the heat exchange chamber passes, the scroll casing including a discharge portion that forms the discharge port and a first case portion having a discharge portion fixed to the partition plate, a second case portion having a peripheral wall facing the housing inlet and removably fixed to the first case portion, and a partition plate provided on the side wall to fix the first case portion and the second case portion. and a fixing portion which connects the first case portion and the second case portion to each other, and a dividing portion which is a joint between the first case portion and the second case portion is formed on the side wall and the peripheral wall, and is formed in a portion other than the discharge portion, and the fixing portion is provided in a portion other than an area surrounded by the housing inlet and a first virtual line which is a virtual straight line connecting each of the two ends of the housing inlet to the rotation shaft when viewed in the axial direction of the rotation shaft of the fan, and the housing inlet, and the dividing portion has a first dividing portion formed on the upstream side and a second dividing portion formed on the downstream side in the direction of air flowing inside the peripheral wall, and between the housing inlet and the housing outlet, one of the first dividing portion and the second dividing portion is formed at a position closer to the housing outlet than the other , and the housing has an inlet wall portion in which the housing inlet is formed, and an outlet wall portion in which the housing outlet is formed, and the inlet wall portion and the outlet wall portion constitute side wall surfaces which are located on opposite sides of the heat exchanger and the centrifugal blower .

According to the present disclosure, the centrifugal blower has a fixing part that fixes the first case part and the second case part to each other. This fixing part is provided on the side wall and is provided in a part other than the area surrounded by the housing inlet and a first virtual line, which is a virtual straight line connecting each of the two ends of the housing inlet to the rotation shaft, when viewed in the axial direction of the rotation shaft of the fan. Since the position of the fixing part is away from the housing inlet of the air conditioner, the air conditioner can suppress interference between the fixing part and the high-speed airflow flowing in from the housing inlet. Therefore, the air conditioner can suppress separation of the airflow flowing through the bell mouth and suppress a decrease in the air volume of the gas flowing into the scroll casing.

1 is a perspective view of a centrifugal blower according to a first embodiment. FIG. 1 is a conceptual diagram of an interior of a centrifugal blower according to a first embodiment, as viewed in the axial direction of a rotation shaft. 1 is a conceptual diagram of the exterior of a centrifugal blower according to a first embodiment, as viewed in the axial direction of a rotation shaft. 1 is a perspective view conceptually illustrating an example of an air conditioning apparatus according to a first embodiment. 1 is a conceptual diagram showing an example of the internal configuration of an air conditioning apparatus according to a first embodiment. 1 is a side view conceptually illustrating an example of the internal configuration of an air conditioning apparatus according to Embodiment 1. FIG. FIG. 11 is a side view conceptually showing the internal configuration of a modified example of the air conditioning apparatus according to Embodiment 1. FIG. 4 is a conceptual diagram of a centrifugal blower according to a comparative example, viewed in the axial direction of a rotating shaft. FIG. 2 is a conceptual diagram showing a divided portion of a centrifugal blower according to a comparative example. FIG. 2 is a conceptual diagram showing an example of the internal configuration of an air conditioning device according to a comparative example. FIG. 11 is a side view conceptually illustrating an example of the internal configuration of an air conditioning apparatus according to embodiment 2. FIG. 11 is a side view conceptually illustrating an example of the internal configuration of an air conditioning apparatus according to embodiment 3. FIG. 11 is a side view conceptually illustrating an example of the internal configuration of an air conditioning apparatus according to embodiment 4. FIG. 13 is a side view conceptually illustrating an example of the internal configuration of an air conditioning apparatus according to embodiment 5. A side view conceptually showing an example of the internal configuration of an air conditioning apparatus according to embodiment 6.

The air conditioning device 40 according to an embodiment of the present disclosure will be described below with reference to the drawings. Note that in the following drawings, including FIG. 1, the relative dimensional relationships and shapes of the components may differ from the actual ones. In addition, in the following drawings, the same reference numerals are used to denote the same or equivalent objects, and this applies throughout the entire specification. In addition, to facilitate understanding, directional terms (e.g., "up," "down," "right," "left," "front," "rear," etc.) are used as appropriate, but these notations are written in this way only for the convenience of explanation and do not limit the arrangement or orientation of the device or parts.

Embodiment 1.
[Centrifugal blower 1]
Fig. 1 is a perspective view of a centrifugal blower 1 according to embodiment 1. Fig. 2 is a conceptual diagram of the inside of the centrifugal blower 1 according to embodiment 1 as viewed in the axial direction of the rotation shaft RS. Fig. 3 is a conceptual diagram of the outside of the centrifugal blower 1 according to embodiment 1 as viewed in the axial direction of the rotation shaft RS. Note that Fig. 2 omits the illustration of the bellmouth 3 in order to explain the internal structure of the centrifugal blower 1.

The centrifugal blower 1 is a double-suction type centrifugal blower 1 in which air is drawn in from both sides in the axial direction of the rotation axis RS of the fan 2. Since the configuration of the centrifugal blower 1 is the same on one side and the other side of the main plate 2a, the configuration of the centrifugal blower 1 will be explained using Figure 1, and the configuration of the centrifugal blower 1 on the opposite side to that in Figure 1 will not be illustrated.

First, the basic structure of the centrifugal blower 1 will be described with reference to Figures 1 to 3. The centrifugal blower 1 is, for example, a multi-blade centrifugal type centrifugal blower such as a sirocco fan or a turbo fan. The centrifugal blower 1 has a fan 2 that generates an airflow and a scroll casing 4 in which the fan 2 is housed.

(Fan 2)
The fan 2 is driven to rotate by a motor or the like (not shown), and forcibly sends air outward in the radial direction by centrifugal force generated by the rotation. As shown in Figs. 1 and 2, the fan 2 has a disk-shaped main plate 2a and a plurality of blades 2d installed on a peripheral portion 2a1 of the main plate 2a. The main plate 2a may be in any shape other than a disk shape, such as a polygonal shape, as long as it is plate-shaped. A shaft portion 2b to which a motor (not shown) is connected is provided in the center of the main plate 2a. The main plate 2a is driven to rotate by the motor via the shaft portion 2b.

The blades 2d are arranged on a circumference centered on the shaft portion 2b, and their base ends are fixed to the main plate 2a. The blades 2d are provided on both sides of the main plate 2a in the axial direction of the rotation axis RS of the fan 2. The blades 2d are arranged at regular intervals from each other on the peripheral portion 2a1 of the main plate 2a. Each blade 2d is formed, for example, in the shape of a curved rectangular plate, and is installed along the radial direction or inclined at a predetermined angle relative to the radial direction.

Each blade 2d is formed so as to be a two-dimensional blade with the same cross-sectional shape continuing in the axial direction of the rotation axis RS, but may be a three-dimensional blade with a twisted shape. Also, each blade 2d is arranged to rise almost perpendicular to the main plate 2a, but is not limited to this configuration, and each blade 2d may be arranged at an angle to the vertical direction of the main plate 2a.

The fan 2 has annular side plates (not shown) at the ends of the multiple blades 2d in the axial direction of the rotation shaft RS. The ends of the blades 2d to which the side plates are attached are the ends of the blades 2d opposite the side connected to the main plate 2a. The side plates connect the multiple blades 2d together, thereby maintaining the positional relationship of the tips of the blades 2d and reinforcing the multiple blades 2d.

As shown in Figure 1, the fan 2 is configured in a cylindrical shape with multiple blades 2d arranged on the main plate 2a. In the axial direction of the rotation axis RS, the fan 2 has an intake port 2e formed at the end of the blade 2d opposite the main plate 2a for allowing gas to flow into the space surrounded by the main plate 2a and the multiple blades 2d. The fan 2 has blades 2d arranged on both sides of the plate surface that constitutes the main plate 2a, and an intake port 2e formed on both sides of the plate surface that constitutes the main plate 2a.

The fan 2 is driven to rotate about the rotation axis RS by driving a motor (not shown). As the fan 2 rotates, gas outside the centrifugal blower 1 flows along the bell mouth 3, passes through the suction port 5 formed in the scroll casing 4 and the suction port 2e of the fan 2, and is sucked into the space surrounded by the main plate 2a and the multiple blades 2d. As the fan 2 rotates, the air sucked into the space surrounded by the main plate 2a and the multiple blades 2d passes between the blades 2d and the adjacent blades 2d and is sent out radially outward.

(Scroll casing 4)
As shown in Fig. 1, the scroll casing 4 houses the fan 2 therein. The scroll casing 4 rectifies the air blown out from the fan 2. The scroll casing 4 is made of resin, but is not limited to being made of resin. The scroll casing 4 has a scroll section 41 and a discharge section 42.

(Scrolling unit 41)
The scroll portion 41 forms an air passage that converts the dynamic pressure of the airflow generated by the fan 2 into static pressure. The scroll portion 41 has a side wall 4a that covers the fan 2 from the axial direction of the rotation axis RS of the shaft portion 2b that constitutes the fan 2 and has an inlet 5 for taking in air formed therein, and a peripheral wall 4c that surrounds the fan 2 from the radial direction of the rotation axis RS.

The scroll section 41 has a tongue portion 43, which is a throttling portion that is located between the discharge section 42 and the beginning of the winding 41a of the peripheral wall 4c and forms a curved surface, and is necessary to blow out the air flowing in from the suction port 5 in the centrifugal direction and increase its pressure. The radial direction of the rotation axis RS is the direction perpendicular to the rotation axis RS. The internal space of the scroll section 41, which is formed by the peripheral wall 4c and the side wall 4a, is a space in which the air blown out from the fan 2 flows along the peripheral wall 4c.

(Side wall 4a)
The side walls 4a are disposed on both sides of the fan 2 in the axial direction of the rotation axis RS of the fan 2. As shown in Figures 1 and 3, the side walls 4a of the scroll casing 4 are formed with suction ports 5 for taking in air so that air can circulate between the fan 2 and the outside of the scroll casing 4.

The suction port 5 is formed in a circular shape, and the fan 2 is positioned so that the center of the suction port 5 and the center of the shaft portion 2b of the fan 2 are approximately aligned. Note that the shape of the suction port 5 is not limited to a circular shape, and may be other shapes, such as an elliptical shape.

The scroll casing 4 of the centrifugal blower 1 is a double-suction type casing having side walls 4a with suction ports 5 formed on both sides of the main plate 2a in the axial direction of the rotation axis RS of the fan 2. In the centrifugal blower 1, the scroll casing 4 has two side walls 4a, which are arranged to face each other.

As shown in FIG. 1, the scroll casing 4 has a first side wall 4a1 and a second side wall 4a2 as side walls 4a. The first side wall 4a1 is formed along a first end 4c11, which is one end of the peripheral wall 4c in the axial direction of the rotation axis RS, and the second side wall 4a2 is formed along a second end 4c12, which is the other end of the peripheral wall 4c in the axial direction of the rotation axis RS. The first side wall 4a1 has an inlet 5 that faces one plate surface of the main plate 2a. The second side wall 4a2 has an inlet 5 that faces the other plate surface of the main plate 2a.

The air intake 5 provided in the side wall 4a is formed by a bell mouth 3, as shown in Figures 1 and 3. The bell mouth 3 straightens the gas sucked into the fan 2 and causes it to flow into the intake 2e of the fan 2. The bell mouth 3 is formed so that the opening diameter gradually decreases from the outside to the inside of the scroll casing 4. The side wall 4a having this configuration allows the air near the intake 5 to flow smoothly along the bell mouth 3 and efficiently flow from the intake 5 into the fan 2.

(Peripheral wall 4c)
The peripheral wall 4c is a wall provided between the opposing side walls 4a, and forms a curved surface in the rotation direction R of the fan 2. The peripheral wall 4c guides the airflow generated by the fan 2 along the curved wall surface to the discharge port 42a via the scroll portion 41. The peripheral wall 4c is disposed, for example, parallel to the axial direction of the rotation axis RS of the fan 2 to cover the fan 2. The peripheral wall 4c may be inclined with respect to the axial direction of the rotation axis RS of the fan 2, and is not limited to being disposed parallel to the axial direction of the rotation axis RS. The peripheral wall 4c covers the fan 2 from the radial direction of the rotation axis RS, and forms an inner peripheral surface facing the multiple blades 2d. The peripheral wall 4c faces the air blowing side of the blades 2d of the fan 2.

2 and 3, the peripheral wall 4c is provided from the start of the winding 41a located at the boundary with the tongue portion 43 to the end of the winding 41b located at the boundary between the discharge portion 42 and the scroll portion 41 on the side away from the tongue portion 43 along the rotation direction R of the fan 2. The start of the winding 41a is the upstream end of the airflow generated by the rotation of the fan 2 in the peripheral wall 4c forming a curved surface, and the end of the winding 41b is the downstream end of the airflow generated by the rotation of the fan 2.

The peripheral wall 4c is formed in a spiral shape in the rotation direction R. Examples of the spiral shape include a logarithmic spiral, an Archimedean spiral, or a spiral shape based on an involute curve. The inner peripheral surface of the peripheral wall 4c forms a curved surface that smoothly curves along the circumferential direction of the fan 2 from the start portion 41a, which is the start of the spiral shape, to the end portion 41b, which is the end of the spiral shape. With this configuration, the air sent out from the fan 2 flows smoothly through the internal space between the fan 2 and the peripheral wall 4c in the direction of the discharge portion 42. Therefore, in the scroll casing 4, the static pressure of the air efficiently increases from the tongue portion 43 toward the discharge portion 42.

(Discharge section 42)
The discharge section 42 forms a discharge port 42a through which the airflow generated by the fan 2 and passing through the scroll section 41 is discharged. The discharge section 42 is formed of a hollow tube having a rectangular cross section perpendicular to the flow direction of the air flowing along the peripheral wall 4c. The cross-sectional shape of the discharge section 42 is not limited to a rectangular shape. The discharge section 42 forms a flow path that guides the air sent out from the fan 2 and flowing through the gap between the peripheral wall 4c and the fan 2 to be discharged to the outside of the scroll casing 4.

As shown in FIG. 1, the discharge section 42 has an extension plate 42b, a diffuser plate 42c, a first side wall 4a1, and a second side wall 4a2. The extension plate 42b is formed to extend from the end portion 41b of the peripheral wall 4c, and is a plate-like portion formed integrally with the peripheral wall 4c. The diffuser plate 42c is formed integrally with the tongue portion 43 of the scroll casing 4, and is a plate-like portion disposed opposite the extension plate 42b. The diffuser plate 42c is formed at a predetermined angle with the extension plate 42b so that the cross-sectional area of the flow path gradually expands along the air flow direction in the discharge section 42.

The extension plate 42b and the diffuser plate 42c are formed between the first side wall 4a1 and the second side wall 4a2. In this manner, the discharge section 42 is formed as a flow path having a rectangular cross section by the extension plate 42b, the diffuser plate 42c, the first side wall 4a1, and the second side wall 4a2.

(Tongue portion 43)
In the scroll casing 4, a tongue portion 43 is formed between the diffuser plate 42c of the discharge portion 42 and the winding start portion 41a of the peripheral wall 4c. The tongue portion 43 is formed with a predetermined radius of curvature, and the peripheral wall 4c is smoothly connected to the diffuser plate 42c via the tongue portion 43.

The tongue portion 43 suppresses the inflow of air from the end of the spiral flow path formed in the scroll casing 4 to the beginning of the spiral. The tongue portion 43 is provided in the upstream part of the ventilation passage, and serves to separate the air flow toward the rotation direction R of the fan 2 from the air flow in the discharge direction from the downstream part of the ventilation passage toward the discharge port 42a. In addition, the static pressure of the air flow flowing into the discharge portion 42 increases as it passes through the scroll casing 4, and becomes higher than inside the scroll casing 4. Therefore, the tongue portion 43 has the function of partitioning such a pressure difference.

(Detailed Configuration of Scroll Casing 4)
1 and 3, the scroll casing 4 has a first case portion 45, a second case portion 46, and a fixing portion 20. The scroll casing 4 can be divided into the first case portion 45 and the second case portion 46. That is, the scroll casing 4 is configured by combining the first case portion 45 and the second case portion 46.

The first case portion 45 has a part of the scroll portion 41 and a discharge portion 42 that forms the discharge port 42a. The first case portion 45 has a part of the peripheral wall 4c and a part of the side wall 4a. The first case portion 45 also has a part of the bell mouth 3.

The second case portion 46 is formed by a part of the scroll portion 41. The second case portion 46 has a part of the peripheral wall 4c and a part of the side wall 4a. The second case portion 46 also has a part of the bell mouth 3. The second case portion 46 is removably fixed to the first case portion 45. When the second case portion 46 is removed from the first case portion 45, the fan 2 is exposed.

When the first case part 45 and the second case part 46 are combined, a circular bell mouth 3 is formed when viewed parallel to the axial direction of the rotation axis RS. In other words, when viewed parallel to the axial direction of the rotation axis RS, the suction port 5 of the scroll casing 4 is formed when the first case part 45 and the second case part 46 are combined.

The scroll casing 4 contains the fan 2 and therefore has a dividing section 60 for ease of assembly. The dividing section 60, which is the joint between the first case section 45 and the second case section 46, is formed at the side wall 4a and the peripheral wall 4c of the scroll casing 4. The dividing section 60 is also formed in a section other than the discharge section 42. More specifically, the dividing section 60 is formed in a section other than the area SA between the start of winding 41a, which is the start of winding of the scroll casing 4, and the discharge port 42a in the direction of the air flow through the discharge section 42.

As an example, region SA is the region between edge 42d and boundary 42e as shown in FIG. 3 when viewed in a direction parallel to the axial direction of rotation axis RS of fan 2. Edge 42d is the edge of side wall 4a that forms outlet 42a. Boundary 42e is an imaginary straight line portion that includes winding start portion 41a when viewed in a direction parallel to the axial direction of rotation axis RS of fan 2, and is an imaginary straight line portion that is parallel to edge 42d. Note that boundary 42e and edge 42d being parallel includes a configuration in which boundary 42e and edge 42d are completely parallel and a configuration in which boundary 42e and edge 42d are approximately parallel.

2 and 3, in the direction of air flow inside the peripheral wall 4c indicated by the air flow AR in Fig. 2, the dividing section 60 has a first dividing section 61 formed on the upstream side of the air flow and a second dividing section 62 formed on the downstream side of the air flow. In the scroll casing 4, the first case section 45 and the second case section 46 are joined at the two dividing sections 60, the first dividing section 61 and the second dividing section 62. In other words, the scroll casing 4 is divided into two components, the first case section 45 and the second case section 46, at the two dividing sections 60, the first dividing section 61 and the second dividing section 62.

The scroll casing 4 has a fixing portion 20 provided at the dividing portion 60. The fixing portion 20 is used to fix the first case portion 45 and the second case portion 46 to each other. The fixing portion 20 is provided on the side wall 4a of the scroll casing 4.

As shown in Fig. 3, the fixing portion 20 has a first fixing portion 20A and a second fixing portion 20B. The first fixing portion 20A is provided in the first division portion 61, and the second fixing portion 20B is provided in the second division portion 62. That is, in the direction of air flow inside the peripheral wall 4c indicated by the air flow AR in Fig. 2, the first fixing portion 20A is provided upstream of the air flow with respect to the second fixing portion 20B, and the second fixing portion 20B is provided downstream of the air flow with respect to the first fixing portion 20A.

The fixing part 20 is formed, for example, by fitting and joining the first engaging part 21 provided on the first case part 45 and the second engaging part 22 provided on the second case part 46. Alternatively, the fixing part 20 may be formed by screwing the first engaging part 21 provided on the first case part 45 and the second engaging part 22 provided on the second case part 46 together. Note that the configuration of the fixing part 20 is not limited to these configurations.

[Air conditioning device 40]
Fig. 4 is a perspective view conceptually showing an example of an air conditioning device 40 according to embodiment 1. Fig. 5 is a conceptual diagram showing an example of the internal configuration of the air conditioning device 40 according to embodiment 1. Fig. 6 is a side view conceptually showing an example of the internal configuration of the air conditioning device 40 according to embodiment 1. Note that in Fig. 5, the upper configuration such as the upper surface portion 16a is omitted in order to show the internal configuration of the air conditioning device 40. The air conditioning device 40 equipped with a centrifugal blower 1 will be described using Figs. 4 to 6.

The air conditioning device 40 is a device that conditions the air in the space to be air-conditioned, adjusting the temperature and humidity of the air it draws in and discharging it into the space to be air-conditioned. The air conditioning device 40 is a ceiling-suspended device that is suspended from the ceiling, but the air conditioning device 40 is not limited to being a ceiling-suspended device.

The air conditioning device 40 comprises a centrifugal blower 1, a drive source 6 that applies a driving force to the fan 2 of the centrifugal blower 1, and a heat exchanger 10 arranged in a position opposite the air discharge port 42a formed in the scroll casing 4 of the centrifugal blower 1. The air conditioning device 40 also comprises a housing 16 that houses the centrifugal blower 1, the drive source 6, and the heat exchanger 10 and is installed on the ceiling of the space to be air-conditioned. Furthermore, the air conditioning device 40 may have a heat insulating material 13 in the heat exchange chamber 26 described later.

(Housing 16)
4, the housing 16 is formed in a box shape, and is formed in a rectangular parallelepiped shape including an upper surface portion 16a, a lower surface portion 16b, and a side surface portion 16c. Note that the shape of the housing 16 is not limited to a rectangular parallelepiped shape, and may be other shapes, such as a cylindrical shape, a prismatic shape, a cone shape, a shape having multiple corners, a shape having multiple curved surfaces, or the like.

The housing 16 has, as one of the side portions 16c, an inlet wall portion 16c1 in which the housing intake port 18 is formed. A filter for removing dust from the air may be disposed in the housing intake port 18. The housing 16 also has, as one of the side portions 16c, an outlet wall portion 16c2 in which the housing air outlet 17 is formed.

In the housing 16, the inlet wall portion 16c1 and the outlet wall portion 16c2 form side wall surfaces located on opposite sides of the heat exchanger 10 and the centrifugal blower 1. The housing intake port 18 may be formed in a position perpendicular to the axial direction of the rotation axis RS of the centrifugal blower 1, for example, the housing intake port 18 may be formed in the bottom surface portion 16b.

Air flowing into the blower chamber 25, which will be described later, passes through the housing intake 18 of the housing 16. The arrow IR shown in FIG. 6 indicates air being drawn into the housing intake 18. The housing outlet 17 of the housing 16 allows air to pass through, flowing out from the heat exchange chamber 26, which will be described later. The arrow OR shown in FIG. 6 indicates air being blown out from the housing outlet 17.

The housing air outlet 17 and the housing air inlet 18 are formed in a rectangular shape as shown in Figures 4 and 5. Note that the shapes of the housing air outlet 17 and the housing air inlet 18 are not limited to a rectangular shape, and may be, for example, a circular shape, an oval shape, or other shapes.

The internal space of the housing 16 is divided by a partition plate 19 into an air blowing chamber 25, which is the space on the suction side of the scroll casing 4, and a heat exchange chamber 26, which is the space on the blowing side of the scroll casing 4. That is, the partition plate 19 divides the internal space of the housing 16 into the air blowing chamber 25 in which the fan 2 is disposed, and the heat exchange chamber 26 in which the heat exchanger 10 is disposed. As shown in Figure 5, the housing 16 contains a drive source 6, two centrifugal blowers 1, and a heat exchanger 10.

(Drive source 6)
The driving source 6 is, for example, a motor. The driving source 6 is supported by a motor support 9a fixed to the upper surface 16a of the housing 16. The driving source 6 has an output shaft 6a. The output shaft 6a is disposed so as to extend parallel to an inlet wall portion 16c1 in which the housing intake port 18 is formed and an outlet wall portion 16c2 in which the housing outlet port 17 is formed.

(Centrifugal blower 1)
The centrifugal blower 1 includes a fan 2 and a scroll casing 4 in which a bell mouth 3 is formed. In the centrifugal blower 1, a discharge portion 42 of the scroll casing 4 is fixed to a partition plate 19, as shown in Fig. 5 and Fig. 6 .

As shown in Fig. 5, the air conditioning device 40 has two centrifugal blowers 1 with their respective fans 2 attached to the output shaft 6a. The centrifugal blower 1 with the fans 2 forms a flow of air that is sucked into the housing 16 from the housing intake 18 and blown out from the housing outlet 17 into the space to be air-conditioned. The number of centrifugal blowers 1 arranged in the housing 16 is not limited to two, and may be one or three or more.

As shown in Figure 6, the second case portion 46 of the scroll casing 4 has a peripheral wall 4c that faces the housing suction port 18. No other components are provided between the peripheral wall 4c that faces the housing suction port 18 and the housing suction port 18, and the peripheral wall 4c and the housing suction port 18 directly face each other.

6, when viewed in the axial direction of the rotation axis RS of the fan 2, an imaginary straight line connecting each of the ends 18a and 18b of the housing suction port 18 with the rotation axis RS is defined as a first imaginary line CL. When viewed in the axial direction of the rotation axis RS, the end 18a is the upper end of the housing suction port 18, and the end 18b is the lower end of the housing suction port 18.

6, when viewed in the axial direction of the rotation axis RS of the fan 2, a substantially triangular area surrounded by the first imaginary line CL and the housing suction port 18 is defined as area SB. When viewed in the axial direction of the rotation axis RS of the fan 2, the fixing part 20 of the centrifugal blower 1 is provided in a part other than area SB surrounded by the first imaginary line CL and the housing suction port 18.

The first fixed part 20A is provided on the opposite side of the second fixed part 20B across the rotation axis RS. The second fixed part 20B is provided on the opposite side of the first fixed part 20A across the rotation axis RS. Note that the positional relationship between the first fixed part 20A and the second fixed part 20B is not limited to this relationship.

Similarly, the first division section 61 is provided on the opposite side of the second division section 62 across the rotation axis RS. The second division section 62 is provided on the opposite side of the first division section 61 across the rotation axis RS. Note that the positional relationship between the first division section 61 and the second division section 62 is not limited to this relationship.

(Heat exchanger 10)
As described above, the heat exchanger 10 is disposed at a position facing the discharge port 42a of the centrifugal blower 1, and is disposed within the housing 16 on the air path of the air discharged by the centrifugal blower 1. The heat exchanger 10 adjusts the temperature of air that is sucked into the housing 16 from the housing inlet 18 and blown out from the housing outlet 17 to the space to be air-conditioned. Note that a heat exchanger of known structure can be used as the heat exchanger 10.

The air conditioning device 40 is arranged in the following order from the housing intake 18 of the air conditioning device 40 toward the housing outlet 17: the housing intake 18, the scroll casing 4 of the centrifugal blower 1, the heat exchanger 10, and the housing outlet 17. In the case of a ceiling-suspended air conditioning device 40, these components are arranged in a horizontal direction.

Figure 7 is a side view conceptually showing the internal configuration of a modified example of the air conditioning device 40 according to the first embodiment. As described above, the area SA is, as an example, the area between the edge portion 42d and the boundary portion 42e as shown in Figure 3 when viewed in a direction parallel to the axial direction of the rotation axis RS of the fan 2. However, the area SA is not limited to this area. For example, as shown in Figure 7, a virtual line FL is defined as a virtual line that passes through the winding start portion 41a of the scroll casing 4 and perpendicularly connects the upper surface portion 16a constituting the upper surface of the housing 16 and the lower surface portion 16b constituting the lower surface of the housing 16. In this case, the area SA may be the area of the scroll casing 4 formed between the virtual line FL and the discharge port 42a.

[Operation example of air conditioning device 40]
When the fan 2 rotates by being driven by the drive source 6, air in the space to be air-conditioned is drawn into the interior of the housing 16 through the housing inlet 18. The air drawn into the interior of the housing 16 flows along the bellmouth 3 and is drawn into the interior of the fan 2. The air drawn into the fan 2 is blown outward in the radial direction of the fan 2.

The air blown out from the fan 2 is pressurized as it passes through the inside of the scroll casing 4. The pressurized air is blown out from the discharge port 42a of the scroll casing 4 and supplied to the heat exchanger 10. As the air supplied to the heat exchanger 10 passes through the heat exchanger 10, it exchanges heat with a heat exchange medium such as a refrigerant flowing inside the heat exchanger 10, and the temperature and humidity are adjusted. The air that has passed through the heat exchanger 10 is blown out from the housing outlet 17 into the space to be air-conditioned.

[Functions and Effects of the Air Conditioning Device 40]
The centrifugal blower 1 has a fixing part 20 that fixes the first case part 45 and the second case part 46 to each other. This fixing part 20 is provided on the side wall 4a. In addition, the fixing part 20 is provided in a part other than the area SB surrounded by the housing suction port 18 and the first virtual line CL, which is a virtual straight line connecting each of the two ends of the housing suction port 18 and the rotation axis RS, when viewed in the axial direction of the rotation axis RS of the fan 2. Since the position of the fixing part 20 is away from the housing suction port 18 of the air conditioning device 40, interference between the fast airflow flowing in from the housing suction port 18 and the fixing part 20 can be suppressed. Therefore, in the air conditioning device 40, separation of the airflow flowing through the bell mouth 3 is suppressed, and a decrease in the air volume of the gas flowing into the scroll casing 4 can be suppressed.

Figure 8 is a conceptual diagram of a centrifugal blower 1L according to a comparative example viewed in the axial direction of the rotation axis RS. Figure 9 is a conceptual diagram of a divided centrifugal blower 1L according to a comparative example. Figure 10 is a conceptual diagram showing an example of the internal configuration of an air conditioning device 40L according to a comparative example. The centrifugal blower 1L and air conditioning device 40L according to the comparative example will be described using Figures 8 to 10.

As shown in FIG. 10, the air conditioning device 40L according to the comparative example has a centrifugal blower 1L. As shown in FIG. 8 and FIG. 9, the scroll casing 4L of the centrifugal blower 1L is divided into two parts, a lower case part 47L and an upper case part 48L, in order to house the fan 2. The scroll casing 4L divided into two parts, the lower case part 47L and the upper case part 48L, has a division part 60L where the two parts are joined to the discharge part 42L that constitutes the discharge port 42a of the scroll casing 4L. The scroll casing 4L also has a further division part 60L on the opposite side of the discharge part 42L across the suction port 5 of the scroll casing 4L from the division part 60 of the discharge part 42L.

In the centrifugal blower 1L of the comparative example, fixing portions 20L are provided on the side wall surface of the scroll casing 4L near each divided portion 60L in order to fix the two parts, the divided lower case portion 47L and upper case portion 48L, to each other.

Generally, when air flowing in from the air conditioner's intake port flows into the fan along the bell mouth of the scroll casing, the airflow has a speed distribution in the circumferential direction of the fan's rotation axis, and the wind speed increases on the intake side of the air conditioner. Therefore, as shown in the area surrounded by the dotted line BD in Figure 10, in the air conditioner 40L according to the comparative example, there is a risk that the fixed part 20L provided on the housing intake port 18 side of the air conditioner 40L and the airflow AR may interfere with each other. In the air conditioner 40L, the fixed part 20L provided on the housing intake port 18 side interferes with the airflow AR, which may cause separation of the airflow flowing through the bell mouth and reduce the amount of gas flowing into the scroll casing 4L.

In contrast, in the air conditioning device 40 according to embodiment 1, the position of the fixed part 20 is moved away from the housing intake 18 of the air conditioning device 40 by the configuration described above, so that interference between the fast airflow flowing in from the housing intake 18 and the fixed part 20 can be suppressed. Therefore, in the air conditioning device 40, separation of the airflow flowing through the bellmouth 3 is suppressed, and a decrease in the volume of air flowing into the scroll casing 4 can be suppressed.

Furthermore, the air conditioning unit 40L in the comparative example generates noise due to interference between the fixed part 20L provided on the housing intake port 18 side and the air flow AR, which may increase the noise emitted from the air conditioning unit 40L.

In contrast, the air conditioning device 40 according to embodiment 1 has the above-described configuration such that the position of the fixed part 20 is away from the housing intake 18 of the air conditioning device 40, and therefore can suppress interference between the fast airflow flowing in from the housing intake 18 and the fixed part 20. Therefore, the air conditioning device 40 can suppress the generation of noise caused by interference between the fast airflow flowing in from the housing intake 18 and the fixed part 20, and can reduce the noise emitted from the air conditioning device 40 compared to the air conditioning device 40L according to the comparative example.

In general, the airflow flowing through the scroll casing is pressurized as it moves toward the discharge port of the scroll casing. In the air conditioning device 40L according to the comparative example, a dividing section 60L is provided in the discharge section 42L that constitutes the discharge port 42a of the scroll casing 4L, so that the pressurized and high-pressure air is likely to leak from the dividing section 60L of the discharge section 42L.

In contrast, in the air conditioning device 40 according to embodiment 1, the dividing section 60 is formed in a portion other than the discharge section 42. In the air conditioning device 40 according to embodiment 1, the dividing section 60 is not formed in the discharge section 42 through which the pressurized air passes, and therefore air leakage at the dividing section 60 can be suppressed compared to the air conditioning device 40L according to the comparative example.

In addition, in the air conditioning device 40 according to embodiment 1, a dividing section 60 is formed in a portion other than the area SA between the discharge port 42a and the start of winding 41a, which is the beginning of the winding of the scroll casing 4, in the direction of air flow through the discharge section 42. That is, the dividing section 60 of the air conditioning device 40 according to embodiment 1 is not formed in the discharge section 42. In the air conditioning device 40 according to embodiment 1, since the dividing section 60 is not formed in the discharge section 42 through which the pressurized air passes, air leakage at the dividing section 60 can be suppressed compared to the air conditioning device 40L according to the comparative example.

In addition, the air conditioning device 40 has an inlet wall 16c1 in which the housing intake 18 is formed and an outlet wall 16c2 in which the housing outlet 17 is formed, which constitute side wall surfaces located on opposite sides of the heat exchanger 10 and the centrifugal blower 1. Therefore, the air conditioning device 40 can arrange the inlet wall 16c1, the centrifugal blower 1, the heat exchanger 10, and the outlet wall 16c2 in a direction along the horizontal direction, and can construct an air path from the housing intake 18 to the housing outlet 17 with a simple configuration. In addition, the air conditioning device 40 can arrange these components in a direction along the horizontal direction, and can be used, for example, as a ceiling-suspended air conditioning device.

Embodiment 2.
[Air conditioning device 40A]
FIG. 11 is a side view conceptually showing an example of the internal configuration of the air conditioning device 40A according to the second embodiment. The same reference numerals are used to designate parts having the same configuration as the air conditioning device 40 in FIGS. 1 to 10, and the description thereof will be omitted. The air conditioning device 40A according to the second embodiment further specifies the positions of the dividing section 60 and the fixing section 20 of the stored centrifugal blower 1A. Therefore, in the following description, the configuration relating to the positions of the dividing section 60 and the fixing section 20 of the centrifugal blower 1A will be mainly described using FIG. 11. The configurations of the air conditioning device 40A and the centrifugal blower 1A according to the second embodiment are the same as the configurations of the air conditioning device 40 and the centrifugal blower 1 according to the first embodiment unless otherwise specified.

The dividing section 60 of the centrifugal blower 1A has a first dividing section 61 formed on the upstream side in the direction of air flow inside the peripheral wall 4c, and a second dividing section 62 formed on the downstream side. In the air conditioning device 40A, one of the first dividing section 61 and the second dividing section 62 is formed between the housing intake 18 and the housing outlet 17, closer to the housing outlet 17 than the other. In other words, the first dividing section 61 and the second dividing section 62 of the centrifugal blower 1A are not positioned on a straight line as in the first embodiment, but are formed at positions offset from each other in the left-right direction.

A fixing portion 20 is provided in the dividing portion 60 of the air conditioning device 40A. Therefore, in the air conditioning device 40A, one of the first fixing portion 20A and the second fixing portion 20B is formed in a position closer to the housing air outlet 17 than the other between the housing air inlet 18 and the housing air outlet 17. In other words, the first fixing portion 20A and the second fixing portion 20B of the centrifugal blower 1A are formed in positions shifted from each other in the left-right direction.

Here, when viewed in the axial direction of the rotation axis RS of the fan 2, the portion of the first division 61 located on the inner edge of the suction port 5 is defined as the first inner edge 5a, and the portion of the second division 62 located on the inner edge of the suction port 5 is defined as the second inner edge 5b. When viewed in the axial direction of the rotation axis RS of the fan 2, the scroll casing 4 may be formed such that a second virtual line TL, which is a virtual straight line connecting the first inner edge 5a and the second inner edge 5b, is closer to the housing air outlet 17 than the rotation axis RS.

[Function and effect of the air conditioning device 40A]
Air conditioning unit 40A has the same position at which dividing section 60 is formed and the same position at which fixing section 20 is provided as air conditioning unit 40 of embodiment 1, and therefore exerts the same effect as air conditioning unit 40.

In the air conditioning device 40A, one of the first division section 61 and the second division section 62 is formed between the housing intake 18 and the housing outlet 17, closer to the housing outlet 17 than the other. When the air conditioning device 40A has this configuration, one of the first fixing section 20A and the second fixing section 20B is formed away from the housing intake 18.

Therefore, in the air conditioning device 40A, the speed of the airflow interfering with the fixed part 20 formed away from the housing intake port 18 is slow. By slowing down the speed of the airflow interfering with the fixed part 20, separation of the airflow flowing through the bellmouth 3 is suppressed, so the air conditioning device 40A can suppress a decrease in the volume of air flowing into the scroll casing 4. In addition, by slowing down the speed of the airflow interfering with the fixed part 20, the air conditioning device 40A can suppress the generation of noise caused by interference between the airflow and the fixed part 20, and can reduce the noise emitted from the air conditioning device 40A compared to the air conditioning device 40L.

In addition, the centrifugal blower 1A takes into consideration the balance of the surface areas of the first case portion 45 and the second case portion 46. When the air conditioning device 40A has the above configuration, it is possible to ensure the distance between the fixed portion 20 and the housing intake port 18 while balancing the surface areas of the first case portion 45 and the second case portion 46.

Furthermore, the scroll casing 4 may be formed such that the second virtual line TL is closer to the housing air outlet 17 than the rotation axis RS. When the air conditioning device 40L has this configuration, both the first fixed portion 20A and the second fixed portion 20B are formed farther away from the housing air inlet 18 than in a configuration in which the first fixed portion 20A and the second fixed portion 20B are formed on opposite sides of the rotation axis RS.

As a result, in air conditioning device 40A, the speed of the airflow interfering with fixed portion 20 is slow. By slowing down the speed of the airflow interfering with fixed portion 20, separation of the airflow flowing through bellmouth 3 is suppressed, and therefore air conditioning device 40A can suppress a decrease in the volume of gas flowing into scroll casing 4. In addition, by slowing down the speed of the airflow interfering with fixed portion 20, air conditioning device 40A can suppress the generation of noise caused by interference between the airflow and fixed portion 20, and can reduce the noise emitted from air conditioning device 40A compared to air conditioning device 40L.

Embodiment 3.
[Air conditioning device 40B]
FIG. 12 is a side view conceptually showing an example of the internal configuration of an air conditioning device 40B according to embodiment 3. Note that parts having the same configuration as the air conditioning device 40 in FIG. 1 to FIG. 11 are given the same reference numerals and their description is omitted. The air conditioning device 40B according to embodiment 3 further specifies the configuration of the divided section 60 of the stored centrifugal blower 1B. Therefore, in the following description, the configuration of the divided section 60 of the centrifugal blower 1B will be mainly described using FIG. 12. Note that the configurations of the air conditioning device 40B and the centrifugal blower 1B according to embodiment 3 are the same as the configurations of the air conditioning device 40 and the centrifugal blower 1 according to embodiment 1 unless otherwise specified.

The centrifugal blower 1B has a scroll casing 4B. The peripheral wall 4c of the scroll casing 4B has a flat portion 65 formed as a flat plate. The flat portion 65 is formed as a flat surface on a portion of the peripheral wall 4c which is formed in a spiral shape. When viewed in the axial direction of the rotation axis RS of the fan 2, the flat portion 65 is formed as a straight line.

The scroll casing 4B is formed such that the dividing section 60 divides the planar section 65. That is, the planar section 65 is formed in the dividing section 60. The planar section 65 formed in the first dividing section 61 and the planar section 65 formed in the second dividing section 62 may be formed parallel to each other when viewed in the axial direction of the rotation axis RS of the fan 2. However, the scroll casing 4 is not limited to a configuration in which the planar section 65 of the first dividing section 61 and the planar section 65 of the second dividing section 62 are formed parallel to each other.

[Functions and Effects of Air Conditioning Device 40B]
Air conditioning unit 40B has the same position at which dividing section 60 is formed and the same position at which fixing section 20 is provided as air conditioning unit 40 of embodiment 1, and therefore exerts the same effect as air conditioning unit 40.

Additionally, scroll casing 4B is formed such that dividing portion 60 divides flat portion 65. In the case of a resin first case portion 45 and a resin second case portion 46, dividing portion 60 has flat portion 65, which makes it easier to remove first case portion 45 and second case portion 46 from the mold, facilitating the manufacturing process of air conditioning unit 40B.

Furthermore, the planar portion 65 formed in the first division 61 and the planar portion 65 formed in the second division 62 are formed parallel when viewed in the axial direction of the rotation axis RS of the fan 2. In the case of the first case portion 45 and the second case portion 46 made of resin, if the planar portion 65 of the first division 61 and the planar portion 65 of the second division 62 are formed parallel, it becomes easier to remove the first case portion 45 and the second case portion 46 from the mold, facilitating the production work of the air conditioning unit 40B.

Embodiment 4.
[Air conditioning device 40C]
FIG. 13 is a side view conceptually showing an example of the internal configuration of an air conditioning device 40C according to embodiment 4. The same reference numerals are used for parts having the same configuration as the air conditioning device 40 in FIG. 1 to FIG. 12, and the description thereof will be omitted. The air conditioning device 40C according to embodiment 4 further specifies the positions of the division part 60 and the fixed part 20 of the stored centrifugal blower 1C. Therefore, in the following description, the configuration related to the positions of the division part 60 and the fixed part 20 of the centrifugal blower 1C will be mainly described using FIG. 13. The configurations of the air conditioning device 40C and the centrifugal blower 1C according to embodiment 4 are the same as the configurations of the air conditioning device 40 and the centrifugal blower 1 according to embodiment 1 unless otherwise specified.

13, when viewed in the axial direction of the rotation axis RS of the fan 2, a substantially triangular area surrounded by the first imaginary line CL and the housing suction port 18 is defined as area SB. When viewed in the axial direction of the rotation axis RS of the fan 2, the fixing part 20 of the centrifugal blower 1C is provided in a part other than area SB surrounded by the first imaginary line CL and the housing suction port 18 as shown in FIG.

13, when viewed in the axial direction of the rotation axis RS of the fan 2, a first reference line SL1 is defined as an imaginary straight line connecting the winding start portion 41a and the rotation axis RS, and the position of the center between the winding start portion 41a and the rotation axis RS on the first reference line SL1 is defined as an intermediate position M1. A virtual straight line extending in the vertical direction including the intermediate position M1 is defined as a second reference line SL2. The second reference line SL2 is, for example, a line along the weight direction.

The fixing portion 20 is provided on the side wall 4a located between the second reference line SL2 and the housing intake port 18. Therefore, as shown in FIG. 13, the fixing portion 20 is provided on the side wall 4a in an area SC between the area SB and the second reference line SL2.

[Function and effect of air conditioning device 40C]
Air conditioning device 40C has the same position at which dividing section 60 is formed and the same position at which fixing section 20 is provided as air conditioning device 40 of embodiment 1, and therefore exerts the same effect as air conditioning device 40.

Furthermore, the fixed part 20 is provided on the side wall 4a located between the second reference line SL2 and the housing intake 18. In the air conditioning device 40C, the position of the fixed part 20 is away from the housing intake 18 of the air conditioning device 40C, so interference between the fast airflow flowing in from the housing intake 18 and the fixed part 20 can be suppressed. Therefore, in the air conditioning device 40C, separation of the airflow flowing through the bellmouth 3 is suppressed, and a decrease in the volume of gas flowing into the scroll casing 4 can be suppressed.

Furthermore, since the fixing portion 20 is provided on the side wall 4a located between the second reference line SL2 and the housing intake port 18, the centrifugal blower 1C can balance the surface areas of the first case portion 45 and the second case portion 46.

Embodiment 5.
[Air conditioning device 40D]
FIG. 14 is a side view conceptually showing an example of the internal configuration of an air conditioning device 40D according to embodiment 5. The same reference numerals are used for parts having the same configuration as the air conditioning device 40 in FIGS. 1 to 13, and the description thereof will be omitted. In the air conditioning device 40D according to embodiment 5, the position of the housing suction port 18 in the housing 16D is different from the position of the housing suction port 18 of the air conditioning device 40 according to embodiment 1. In the following description, the relationship between the housing 16D and the centrifugal blower 1 will be mainly described using FIG. 14. The configuration of the air conditioning device 40D according to embodiment 5 is the same as the configuration of the air conditioning device 40 according to embodiment 1 unless otherwise specified.

The housing 16D has an inlet wall 16b1 in which the housing intake port 18 is formed, and an outlet wall 16c2 in which the housing outlet 17 is formed. The inlet wall 16b1 constitutes the wall on the bottom surface of the housing 16D. The inlet wall 16b1 is part of the bottom surface 16b. The outlet wall 16c2 constitutes the wall on the side surface of the housing 16D.

As shown in Figure 14, the second case portion 46 of the scroll casing 4 has a peripheral wall 4c that faces the housing suction port 18. No other components are provided between the peripheral wall 4c that faces the housing suction port 18 and the housing suction port 18, and the peripheral wall 4c and the housing suction port 18 directly face each other.

Here, as shown in FIG. 14, when viewed in the axial direction of the rotation axis RS of the fan 2, a virtual straight line connecting each of the ends 18d and 18e of the housing intake 18 to the rotation axis RS is defined as a first virtual line CL. When viewed in the axial direction of the rotation axis RS, the end 18d is the end on the housing air outlet 17 side, or the end on the front side of the housing 16D. The end 18e is the end on the rear side of the housing 16D. Note that here, the side of the housing 16D on which the housing air outlet 17 is formed is defined as the front side of the housing 16D, and the side opposite the housing air outlet 17 is defined as the rear side of the housing 16D.

14, when viewed in the axial direction of the rotation axis RS of the fan 2, a substantially triangular area surrounded by the first imaginary line CL and the housing suction port 18 is defined as area SB. When viewed in the axial direction of the rotation axis RS of the fan 2, the fixing part 20 of the centrifugal blower 1 is provided in a part other than area SB surrounded by the first imaginary line CL and the housing suction port 18 as shown in FIG.

[Functions and Effects of Air Conditioning Device 40D]
Air conditioning unit 40D has the same position at which dividing section 60 is formed and the same position at which fixing section 20 is provided as air conditioning unit 40 of embodiment 1, and therefore exerts the same effect as air conditioning unit 40.

In addition, the inlet wall 16b1 in which the housing intake port 18 is formed constitutes the bottom wall of the housing 16D, and the outlet wall 16c2 in which the housing outlet 17 is formed constitutes the side wall of the housing 16D. Therefore, the air conditioning device 40D can suck in air from below and discharge the conditioned air to the side.

Embodiment 6.
[Air conditioning device 40E]
FIG. 15 is a side view conceptually illustrating an example of the internal configuration of an air conditioning device 40E according to embodiment 6. The same reference numerals are used for parts having the same configuration as the air conditioning device 40 in FIGS. 1 to 14, and the description thereof will be omitted. In the air conditioning device 40E according to embodiment 6, the position of the housing suction port 18 in the housing 16E is different from the position of the housing suction port 18 of the air conditioning device 40 according to embodiment 1. In the following description, the relationship between the housing 16E and the centrifugal blower 1 will be mainly described using FIG. 15. The configuration of the air conditioning device 40E according to embodiment 6 is the same as the configuration of the air conditioning device 40 according to embodiment 1 unless otherwise specified.

The housing 16E has an inlet wall 16b1 in which the housing intake port 18 is formed, and an outlet wall 16c2 in which the housing outlet 17 is formed. The inlet wall 16b1 constitutes the wall of the lower surface of the housing 16E. The inlet wall 16b1 is part of the lower surface 16b. The outlet wall 16c2 constitutes the wall of the side surface of the housing 16E.

In addition, the housing 16E has an inlet wall portion 16c1, as one of the side portions 16c, in which a housing intake port 18 is formed. In the housing 16E, the inlet wall portion 16c1 and the outlet wall portion 16c2 form side wall surfaces located on opposite sides of the heat exchanger 10 and the centrifugal blower 1. The housing 16E has two air intake ports, a housing intake port 18 formed in the inlet wall portion 16b1 and a housing intake port 18 formed in the inlet wall portion 16c1.

15, the second case portion 46 of the scroll casing 4 has a peripheral wall 4c that faces two air intake ports, the housing intake port 18 formed in the inlet wall portion 16b1 and the housing intake port 18 formed in the inlet wall portion 16c1. No other components are provided between the peripheral wall 4c that faces the housing intake port 18 and the housing intake port 18, and the peripheral wall 4c and the housing intake port 18 directly face each other.

15, when viewed in the axial direction of the rotation axis RS of the fan 2, the shortest imaginary line connecting the surface that forms the housing intake 18 of the inlet wall 16c1 and the rotation axis RS is defined as the horizontal line EL1. The horizontal line EL1 is a line perpendicular to the surface that forms the housing intake 18 of the inlet wall 16c1.

In addition, when viewed in the axial direction of the rotation axis RS of the fan 2, the shortest imaginary line connecting the surface that forms the housing intake 18 of the inlet wall portion 16b1 and the rotation axis RS is defined as the vertical line EL2. The vertical line EL2 is a line perpendicular to the surface that forms the housing intake 18 of the inlet wall portion 16b1.

When viewed in the axial direction of the rotation axis RS of the fan 2, the area surrounded by the housing intake 18 of the inlet wall portion 16c1, the horizontal straight line EL1, the housing intake 18 of the inlet wall portion 16b1, and the vertical straight line EL2 is defined as area SE.

The air conditioning unit 40E does not include a fixed portion 20 and a dividing portion 60 in the region SE.

[Functions and Effects of the Air Conditioning Device 40E]
Area SE is an area close to the two air intakes, the housing intake 18 formed in the inlet wall 16b1 and the inlet wall 16c1, and is an area where the amount of air intake is relatively large. Air conditioning device 40E does not include the fixed part 20 and the dividing part 60 in area SE. By having this configuration for air conditioning device 40E, the fixed part 20 is not provided in an area where the amount of air intake is relatively large.

Therefore, the air conditioning device 40E can suppress the amount of airflow that interferes with the fixed portion 20. By suppressing the amount of airflow that interferes with the fixed portion 20, the air conditioning device 40E suppresses separation of the airflow flowing through the bellmouth 3, and therefore can suppress a decrease in the air volume of the gas flowing into the scroll casing 4. Furthermore, by suppressing the amount of airflow that interferes with the fixed portion 20, the air conditioning device 40E can suppress the generation of noise caused by interference between the airflow and the fixed portion 20, and can reduce the noise emitted from the air conditioning device 40E compared to the air conditioning device 40L.

In addition, the air conditioning device 40E does not include the fixed part 20 and the dividing part 60 in the region SE. In the air conditioning device 40E, the speed of the airflow interfering with the fixed part 20 formed far from the two air intakes of the housing intake 18 formed in the inlet wall part 16b1 and the inlet wall part 16c1 is slow. By slowing down the speed of the airflow interfering with the fixed part 20, separation of the airflow flowing through the bellmouth 3 is suppressed, so the air conditioning device 40E can suppress a decrease in the air volume of the gas flowing into the scroll casing 4. In addition, by slowing down the speed of the airflow interfering with the fixed part 20, the air conditioning device 40E can suppress the generation of noise caused by interference between the airflow and the fixed part 20, and can reduce the noise emitted from the air conditioning device 40E compared to the air conditioning device 40L.

In the above-mentioned first to sixth embodiments, a double-suction centrifugal blower 1 having a double-suction fan 2 in which multiple blades 2d are formed on both sides of the main plate 11 is taken as an example. However, the first to sixth embodiments can also be applied to a single-suction centrifugal blower 1 having a single-suction fan 2 in which multiple blades 2d are formed on only one side of the main plate 11.

Each of the above-mentioned embodiments 1 to 6 can be implemented in combination with each other. Furthermore, the configurations shown in the above-mentioned embodiments are merely examples, and can be combined with other known technologies, and parts of the configurations can be omitted or modified without departing from the spirit of the invention.

1 Centrifugal blower, 1A Centrifugal blower, 1B Centrifugal blower, 1C Centrifugal blower, 1L Centrifugal blower, 2 Fan, 2a Main plate, 2a1 Peripheral edge, 2b Shaft, 2d Blade, 2e Intake port, 3 Bell mouth, 4 Scroll casing, 4B Scroll casing, 4L Scroll casing, 4a Side wall, 4a1 First side wall, 4a2 Second side wall, 4c Peripheral wall, 4c11 First end, 4c12 Second end, 5 Intake port, 5a First inner edge, 5b Second inner edge, 6 Drive source, 6a Output shaft, 9a Motor support, 10 Heat exchanger, 11 Main plate, 13 Insulation material, 16 Housing, 16D Housing, 16E Housing, 16a Upper surface, 16b Lower surface, 16b1 Inlet wall portion, 16c side portion, 16c1 inlet wall portion, 16c2 outlet wall portion, 17 housing air outlet, 18 housing air inlet, 18a end portion, 18b end portion, 18d end portion, 18e end portion, 19 partition plate, 20 fixing portion, 20A first fixing portion, 20B second fixing portion, 20L fixing portion, 21 first engagement portion, 22 second engagement portion, 25 blower chamber, 26 heat exchange chamber, 40 air conditioner, 40A air conditioner, 40B air conditioner, 40C air conditioner, 40D air conditioner, 40E air conditioner, 40L air conditioner, 41 scroll portion, 41a start portion, 41b end portion, 42 discharge portion, 42L discharge portion, 42a discharge port, 42b extension plate, 42c diffuser plate, 42d Edge portion, 42e boundary portion, 43 tongue portion, 45 first case portion, 46 second case portion, 47L lower case portion, 48L upper case portion, 60 division portion, 60L division portion, 61 first division portion, 62 second division portion, 65 flat portion, AR air flow, BD dotted line, CL first virtual line, EL1 horizontal straight line, EL2 vertical straight line, FL virtual line, IR arrow, M1 intermediate position, OR arrow, R rotation direction, RS rotation axis, SA area, SB area, SC area, SE area, SL1 first reference line, SL2 second reference line, TL second virtual line.

Claims (5)

a centrifugal blower including a rotationally driven fan and a scroll casing in which the fan is housed and which has a peripheral wall formed in a spiral shape and a side wall provided with an air suction port;
A drive source that applies a drive force to the fan;
a heat exchanger disposed at a position facing an air discharge port formed in the scroll casing;
a housing in which the centrifugal blower, the driving source, and the heat exchanger are housed, the housing having a partition plate separating an interior into an air blowing chamber in which the fan is disposed and a heat exchange chamber in which the heat exchanger is disposed, the housing being formed with a housing intake port through which air flowing into the air blowing chamber passes and a housing outlet port through which air flowing out of the heat exchange chamber passes;
Equipped with
The scroll casing comprises:
a first case portion having a discharge portion that forms the discharge port, the discharge portion being fixed to the partition plate;
a second case portion having the peripheral wall facing the housing intake port and removably fixed to the first case portion;
a fixing portion provided on the side wall and configured to fix the first case portion and the second case portion;
having
A division portion which is a joint portion between the first case portion and the second case portion is
the side wall and the peripheral wall, and is formed in a portion other than the discharge portion,
The fixing portion is
the housing suction port is provided in a portion other than a region surrounded by a first virtual line, which is a virtual straight line connecting each of both ends of the housing suction port and the rotation shaft, when viewed in an axial direction of a rotation shaft of the fan, and the housing suction port,
The division unit is
In the direction of air flow inside the peripheral wall,
A first division portion formed on the upstream side;
A second division portion formed on the downstream side;
having
Between the housing inlet and the housing outlet, one of the first divided portion and the second divided portion is formed at a position closer to the housing outlet than the other of the first divided portion ,
The housing includes:
an inlet wall portion in which the housing intake port is formed;
An outlet wall portion in which the housing air outlet is formed;
having
The inlet wall portion and the outlet wall portion constitute side wall surfaces located on opposite sides of the heat exchanger and the centrifugal blower . a centrifugal blower including a rotationally driven fan and a scroll casing in which the fan is housed and which has a peripheral wall formed in a spiral shape and a side wall provided with an air suction port;
A drive source that applies a drive force to the fan;
a heat exchanger disposed at a position facing an air discharge port formed in the scroll casing;
a housing in which the centrifugal blower, the driving source, and the heat exchanger are housed, the housing having a partition plate separating an interior into an air blowing chamber in which the fan is disposed and a heat exchange chamber in which the heat exchanger is disposed, the housing being formed with a housing intake port through which air flowing into the air blowing chamber passes and a housing outlet port through which air flowing out of the heat exchange chamber passes;
Equipped with
The scroll casing comprises:
a first case portion having a discharge portion that forms the discharge port, the discharge portion being fixed to the partition plate;
a second case portion having the peripheral wall facing the housing intake port and removably fixed to the first case portion;
a fixing portion provided on the side wall and configured to fix the first case portion and the second case portion;
having
A division portion which is a joint portion between the first case portion and the second case portion is
The nozzle is formed on the side wall and the peripheral wall, and is formed on a portion other than the discharge portion,
The fixing portion is
the housing suction port is provided in a portion other than a region surrounded by a first virtual line, which is a virtual straight line connecting each of both ends of the housing suction port and the rotation shaft, when viewed in an axial direction of a rotation shaft of the fan, and the housing suction port,
The division unit is
In the direction of air flow inside the peripheral wall,
A first division portion formed on the upstream side;
A second division portion formed on the downstream side;
having
Between the housing inlet and the housing outlet, one of the first divided portion and the second divided portion is formed at a position closer to the housing outlet than the other of the first divided portion,
When viewed in the axial direction of the rotation shaft, a portion of the first divided portion located on an inner edge of the suction port is defined as a first inner edge portion, and a portion of the second divided portion located on the inner edge of the suction port is defined as a second inner edge portion,
The scroll casing comprises:
An air conditioning apparatus, wherein a second imaginary line that is an imaginary straight line connecting the first inner edge portion and the second inner edge portion is formed at a position closer to the discharge port than the rotation axis. When viewed in the axial direction of the rotation shaft, a portion of the first divided portion located on an inner edge of the suction port is defined as a first inner edge portion, and a portion of the second divided portion located on the inner edge of the suction port is defined as a second inner edge portion,
The scroll casing comprises:
The air conditioning apparatus according to claim 1 , wherein a second imaginary line that is an imaginary straight line connecting the first inner edge portion and the second inner edge portion is formed at a position closer to the discharge port than the rotation axis. The fixing portion is
When viewed in the axial direction of the rotation shaft, the center position of a first reference line, which is a virtual straight line connecting the start of winding of the scroll casing and the rotation shaft, is set as the intermediate position,
The fixing portion is
The air conditioning device according to any one of claims 1 to 3, wherein the second reference line is an imaginary straight line extending in the vertical direction including the intermediate position, and is provided on the side wall located between the housing intake port and a second reference line. The peripheral wall is
A part of the wall has a flat surface formed in a flat plate shape,
The scroll casing comprises:
The air conditioner according to any one of claims 1 to 4, wherein the dividing portion is formed so as to divide the planar portion.

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