JPWO2020202420A1 - Centrifugal blower, blower, air conditioner and refrigeration cycle device - Google Patents

Abstract

Even with a double suction type centrifugal blower, the airflow is efficiently boosted.
The peripheral wall facing the first blade portion (2d1) is defined as the first peripheral wall (44a), and the peripheral wall facing the second blade portion is defined as the second peripheral wall (44b). The position of the first peripheral wall where the distance (R1) between the first peripheral wall and the rotation axis in the direction orthogonal to the axial direction is maximum in the axial direction is defined as the first maximum portion (141c), and the axial direction is defined. When the position of the second peripheral wall where the distance (R11) between the second peripheral wall and the rotation axis in the direction orthogonal to the axis is maximum in the axial direction is defined as the second maximum portion (141d), the first The maximum portion is formed on the main plate side of the intermediate position between the main plate (2a) and the first side plate in the axial direction, and the second maximum portion is formed between the main plate and the second side plate in the axial direction. Centrifugal blower formed on the main plate side of the middle position of.

Description

The present invention relates to a double suction type centrifugal blower having a scroll casing, a blower equipped with the centrifugal blower, an air conditioner and a refrigeration cycle device.

A conventional centrifugal blower includes an impeller composed of a main plate on a disk and a large number of blades, and a scroll casing that houses the impeller and has a suction port through which air flowing into the impeller passes. ing. The airflow blown out by the rotation of the impeller has a velocity distribution in the rotation axis direction of the impeller, and the velocity of the airflow is higher on the main plate side than on the suction port side. In the conventional centrifugal blower, since the distance between the impeller and the scroll peripheral wall is constant in the rotation axis direction of the impeller, the airflow from the main plate side, which has a high speed, collides with the scroll peripheral wall, and the airflow is efficiently flown in the scroll casing. It is a factor that cannot be boosted. Therefore, a single-suction centrifugal blower has been proposed in which the airflow is efficiently boosted by increasing the distance between the impeller and the scroll peripheral wall at a place where the wind speed of the airflow discharged from the impeller is high (for example, a patent). Reference 1).

Jikkenhei 01-108399

However, the centrifugal blower of Patent Document 1 is a single-suction type centrifugal blower. In contrast to the single-suction type centrifugal blower, in the double-suction type centrifugal blower, the air flows flowing from the suction ports formed at both ends in the rotation axis direction of the impeller merge on the main plate side. Therefore, in the double suction type centrifugal blower, when the airflow collides with the scroll peripheral wall, the flow becomes turbulent, and there is a problem that the airflow cannot be efficiently boosted by simply increasing the distance between the impeller and the scroll peripheral wall.

The present invention is for solving the above-mentioned problems, and obtains a centrifugal blower, a blower, an air conditioner, and a refrigeration cycle device capable of efficiently boosting the air flow even with a double suction type centrifugal blower. The purpose is.

The centrifugal blower according to the present invention is composed of a main plate that is rotationally driven, an annular first side plate that is arranged so as to face the main plate, and a plurality of blades that are arranged between the main plate and the first side plate. It is arranged between the first blade portion and the annular second side plate and the main plate and the second side plate which are arranged opposite to the main plate on the side opposite to the side where the first side plate is arranged with respect to the main plate. An impeller having a second blade portion composed of a plurality of blades, a peripheral wall formed in a spiral shape, and a first suction port facing the plate surface of the main plate on the side on which the first side plate is arranged. A scroll casing that has a first side wall on which the second side plate is formed and a second side wall on which a second suction port is formed that faces the plate surface of the main plate on the side on which the second side plate is arranged. The peripheral wall facing the first blade portion is defined as the first peripheral wall and the peripheral wall facing the second blade portion is defined as the second peripheral wall. The position of the first peripheral wall where the distance between the peripheral wall and the rotation axis is maximum in the axial direction is defined as the first maximum portion, and between the second peripheral wall and the rotation axis in the direction orthogonal to the axial direction. When the position of the second peripheral wall where the distance is maximum in the axial direction is defined as the second maximum portion, the first maximum portion is closer to the main plate than the intermediate position between the main plate and the first side plate in the axial direction. The second maximum portion is formed on the main plate side of the intermediate position between the main plate and the second side plate in the axial direction.

The blower according to the present invention includes the above-mentioned centrifugal blower and a case for accommodating the centrifugal blower.

The air conditioner according to the present invention includes the above-mentioned centrifugal blower and a heat exchanger arranged at a position facing the discharge port of the centrifugal blower.

The refrigeration cycle device according to the present invention includes the above-mentioned centrifugal blower.

According to the present invention, in the centrifugal blower, the first maximum portion is formed in the axial direction on the main plate side of the intermediate position between the main plate and the first side plate, and the second maximum portion is formed in the axial direction. , It is formed on the main plate side of the intermediate position between the main plate and the second side plate. In the centrifugal blower, the distance between the impeller and the peripheral wall of the scroll casing is widened on the main plate side rather than on the side plate side by the first maximum part and the second maximum part, so that the air flow from the suction port flows into the main plate. When merging on the side, it goes toward the peripheral wall side, so turbulence of the airflow is suppressed. Therefore, the centrifugal blower reduces the pressure loss caused by the turbulence of the airflow, and can efficiently boost the airflow in the scroll casing.

It is a perspective view of the centrifugal blower which concerns on Embodiment 1. FIG. It is a conceptual diagram which shows the relationship between the impeller of FIG. 1 and the peripheral wall of a scroll casing. It is a conceptual diagram explaining the relationship between the peripheral wall of the centrifugal blower which concerns on Embodiment 1 and an impeller. It is a conceptual diagram explaining the relationship between the peripheral wall of the centrifugal blower which is the modification of the centrifugal blower which concerns on Embodiment 1, and an impeller. FIG. 5 is a conceptual diagram of an example in which the relationship between the peripheral wall of the centrifugal blower according to the first embodiment and the impeller is viewed from a direction parallel to the axial direction of the rotation axis. FIG. 5 is a conceptual diagram of another example in which the relationship between the peripheral wall of the centrifugal blower according to the first embodiment and the impeller is viewed from a direction parallel to the axial direction of the rotation axis. FIG. 5 is a conceptual diagram of another example in which the relationship between the peripheral wall of the centrifugal blower according to the first embodiment and the impeller is viewed from a direction parallel to the axial direction of the rotation axis. It is a conceptual diagram which showed the flow of the air in the scroll casing of the centrifugal blower which concerns on Embodiment 1. FIG. It is a conceptual diagram which showed the air flow in the scroll casing of the centrifugal blower which is the modification of the centrifugal blower which concerns on Embodiment 1. FIG. It is a conceptual diagram explaining the relationship between the peripheral wall of the centrifugal blower which concerns on Embodiment 2 and an impeller. It is a conceptual diagram explaining the relationship between the peripheral wall of the centrifugal blower which is the modification of the centrifugal blower which concerns on Embodiment 2, and the impeller. It is a conceptual diagram which shows the relationship between a centrifugal blower and a resistor by using the main part structure of a unit. It is another conceptual diagram which shows the relationship between a centrifugal blower and a resistor using the main part structure of a unit. It is a conceptual diagram which showed the air flow in the scroll casing of the centrifugal blower which concerns on Embodiment 2. FIG. It is a conceptual diagram which showed the air flow in the scroll casing of the centrifugal blower which is the modification of the centrifugal blower which concerns on Embodiment 2. FIG. It is a figure which shows the structure of the blower device which concerns on Embodiment 3. It is a perspective view which conceptually showed an example of the air conditioner which concerns on Embodiment 4. FIG. It is a conceptual diagram which shows an example of the internal structure of the air conditioner which concerns on Embodiment 4. FIG. It is a side view which conceptually shows an example of the internal structure of the air conditioner which concerns on Embodiment 4. FIG. It is a side view which shows the internal structure of the modified example of the air conditioner which concerns on Embodiment 4. FIG. It is a figure which shows the structure of the refrigerating cycle apparatus which concerns on Embodiment 5.

Hereinafter, the centrifugal blower 1 according to the embodiment will be described with reference to the drawings and the like. Further, the blower 30, the air conditioner 40, and the refrigeration cycle device 50 according to the embodiment will also be described with reference to the drawings and the like. In the following drawings including FIG. 1, the relative dimensional relationships and shapes of the constituent members may differ from the actual ones. Further, in the following drawings, those having the same reference numerals are the same or equivalent thereof, and this shall be common to the entire text of the specification. In addition, terms that indicate directions (for example, "top", "bottom", "right", "left", "front", "rear", etc.) are used as appropriate for ease of understanding. For convenience of explanation, it is described as such, and does not limit the arrangement and orientation of the device or component.

Embodiment 1.
[Centrifugal blower 1]
FIG. 1 is a perspective view of the centrifugal blower 1 according to the first embodiment. FIG. 2 is a conceptual diagram showing the relationship between the impeller 2 of FIG. 1 and the peripheral wall 4c of the scroll casing 4. The centrifugal blower 1 is a double suction type centrifugal blower in which air is sucked from both ends in the rotation axis direction RS of the impeller 2. Since the configuration of the centrifugal blower 1 shown in FIG. 1 has the same configuration on the opposite side, the configuration of the centrifugal blower 1 will be described with reference to FIG. Omit. First, the basic structure of the centrifugal blower 1 will be described with reference to FIGS. 1 and 2. The centrifugal blower 1 is, for example, a multi-blade centrifugal type centrifugal blower 1 such as a sirocco fan or a turbo fan, and has an impeller 2 for generating an air flow and a scroll casing 4 for accommodating the impeller 2.

(Imperial wheel 2)
The impeller 2 is rotationally driven by a motor or the like (not shown), and forcibly sends air outward in the radial direction by a centrifugal force generated by the rotation. As shown in FIGS. 1 and 2, the impeller 2 has a disk-shaped main plate 2a and a plurality of blades 2d installed on the peripheral edge portion 2a1 of the main plate 2a. The main plate 2a may have a plate shape, and may have a shape other than a disk shape, such as a polygonal shape. At the center of the main plate 2a, a shaft portion 2b to which a motor (not shown) is connected is provided. The main plate 2a is rotationally driven by a motor via the shaft portion 2b.

The plurality of blades 2d are arranged on the circumference centered on the shaft portion 2b, and the base end is fixed to the main plate 2a. The plurality of blades 2d are provided on both sides of the main plate 2a in the axial direction of the rotation shaft RS of the shaft portion 2b. The blades 2d are arranged on the peripheral edge portion 2a1 of the main plate 2a at regular intervals. 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 with respect to the radial direction. Each blade 2d is formed so that the same cross-sectional shape is a two-dimensional blade continuous in the axial direction of the rotation axis RS, but each blade 2d may be a three-dimensional blade having a twisted shape. Further, although each blade 2d is provided so as to stand up substantially perpendicular to the main plate 2a, the present invention is not limited to this, and each blade 2d is provided so as to be inclined with respect to the vertical direction of the main plate 2a. You may.

The impeller 2 has an annular side plate 2c attached to an end portion of the shaft portion 2b opposite to the main plate 2a of the plurality of blades 2d in the axial direction of the rotating shaft RS. The side plate 2c maintains the positional relationship of the tips of the respective blades 2d by connecting the plurality of blades 2d, and reinforces the plurality of blades 2d. Therefore, each of the plurality of blades 2d has one end connected to the main plate 2a and the other end connected to the side plate 2c, and is arranged between the main plate 2a and the side plate 2c.

The impeller 2 is formed in a tubular shape by a plurality of blades 2d arranged on the main plate 2a. Then, the impeller 2 is for allowing gas to flow into the space surrounded by the main plate 2a and the plurality of blades 2d on the side plate 2c side opposite to the main plate 2a in the axial direction of the rotating shaft RS of the shaft portion 2b. The suction port 2e is formed. In the impeller 2, blades 2d and side plates 2c are arranged on both sides of a plate surface forming the main plate 2a, and suction ports 2e are formed on both sides of the plate surface forming the main plate 2a.

The impeller 2 is rotationally driven around the rotation shaft RS by being driven by a motor (not shown). As the impeller 2 rotates, the gas outside the centrifugal blower 1 passes through the suction port 5 formed in the scroll casing 4 and the suction port 2e of the impeller 2, and the main plate 2a and the plurality of blades 2d It is sucked into the enclosed space. Then, as the impeller 2 rotates, the air sucked into the space surrounded by the main plate 2a and the plurality of blades 2d passes between the blades 2d and the adjacent blades 2d and is sent out in the radial direction. ..

(Scroll casing 4)
The scroll casing 4 houses the impeller 2 and rectifies the air blown out from the impeller 2. The scroll casing 4 has a scroll portion 41 and a discharge portion 42.

(Scroll unit 41)
The scroll unit 41 forms an air passage that converts the dynamic pressure of the air flow generated by the impeller 2 into static pressure. The scroll portion 41 covers the impeller 2 from the axial direction of the rotating shaft RS of the shaft portion 2b constituting the impeller 2, and has a side wall 4a formed with a suction port 5 for taking in air, and the impeller 2 on the shaft portion 2b. It has a peripheral wall 4c that surrounds the impeller 2 from the radial direction of the rotating shaft RS. Further, the scroll portion 41 is located between the discharge portion 42 and the winding start portion 41a of the peripheral wall 4c to form a curved surface, and the airflow generated by the impeller 2 is sent to the discharge port 42a via the scroll portion 41. It has a guiding tongue 43. The radial direction of the rotation axis RS is a direction perpendicular to the rotation axis RS. The internal space of the scroll portion 41 composed of the peripheral wall 4c and the side wall 4a is a space in which the air blown from the impeller 2 flows along the peripheral wall 4c.

(Wall 4a)
The side walls 4a are arranged on both sides of the impeller 2 in the axial direction of the rotating shaft RS of the impeller 2. A suction port 5 is formed on the side wall 4a of the scroll casing 4 so that air can flow between the impeller 2 and the outside of the scroll casing 4. The suction port 5 is formed in a circular shape, and the impeller 2 is arranged so that the center of the suction port 5 and the center of the shaft portion 2b of the impeller 2 substantially coincide with each other. The shape of the suction port 5 is not limited to a circular shape, and may be another shape such as an elliptical shape. The scroll casing 4 of the centrifugal blower 1 is a double-suction type casing having side walls 4a having suction ports 5 formed on both sides of the main plate 2a in the axial direction of the rotating shaft RS of the shaft portion 2b. In the centrifugal blower 1, the scroll casing 4 has two side walls 4a, and the side walls 4a are arranged so as to face each other. More specifically, the scroll casing has a first side wall 4a1 and a second side wall 4a2 as the side wall 4a. The first side wall 4a1 forms a first suction port 5a facing the plate surface of the main plate 2a on the side where the first side plate 2c1 is arranged. The second side wall 4a2 forms a second suction port 5b facing the plate surface of the main plate 2a on the side where the second side plate 2c2 is arranged. The above-mentioned suction port 5 is a general term for the first suction port 5a and the second suction port 5b.

The suction port 5 provided on the side wall 4a is formed by the bell mouth 3. The bell mouth 3 rectifies the gas sucked into the impeller 2 and causes it to flow into the suction port 2e of the impeller 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. Due to the configuration of the side wall 4a, the air in the vicinity of the suction port 5 flows smoothly and efficiently flows into the impeller 2 from the suction port 5.

(Peripheral wall 4c)
The peripheral wall 4c guides the airflow generated by the impeller 2 along the curved wall surface to the discharge port 42a via the scroll portion 41. The peripheral wall 4c is a wall provided between the side walls 4a facing each other, and constitutes a curved surface in the rotation direction R of the impeller 2. The peripheral wall 4c is arranged in a direction perpendicular to the axial direction of the rotation axis RS of the impeller 2. The peripheral wall 4c covers the impeller 2 from the radial direction of the shaft portion 2b, and constitutes an inner peripheral surface facing the plurality of blades 2d. The peripheral wall 4c faces the air blowing side of the blade 2d of the impeller 2. As shown in FIG. 2, the peripheral wall 4c has a discharge portion 42 and a scroll portion 41 on the side away from the tongue portion 43 along the rotation direction R of the impeller 2 from the winding start portion 41a located at the boundary with the tongue portion 43. It is provided up to the winding end 41b located at the boundary with. The winding start portion 41a is an upstream end portion of the airflow generated by the rotation of the impeller 2 on the peripheral wall 4c forming the curved surface, and the winding end portion 41b is a downstream end of the airflow generated by the rotation of the impeller 2. The end of the side.

The peripheral wall 4c is formed in a spiral shape. Examples of the spiral shape include a logarithmic spiral, an Archimedes spiral, a spiral shape based on an involute curve, and the like. The inner peripheral surface of the peripheral wall 4c constitutes a curved surface that smoothly curves along the circumferential direction of the impeller 2 from the winding start portion 41a, which is the start of spiral winding, to the winding end portion 41b, which is the end of spiral winding. .. With such a configuration, the air sent out from the impeller 2 smoothly flows in the gap between the impeller 2 and the peripheral wall 4c in the direction of the discharge portion 42. Therefore, in the scroll casing 4, the static pressure of air efficiently increases from the tongue portion 43 toward the discharge portion 42. The detailed configuration of the peripheral wall 4c will be described later.

(Discharge section 42)
The discharge unit 42 forms a discharge port 42a that is generated by the impeller 2 and discharges the airflow that has passed through the scroll unit 41. The discharge portion 42 is composed of a hollow pipe having a rectangular cross section orthogonal to the flow direction of the air flowing along the peripheral wall 4c. The discharge unit 42 forms a flow path that guides the air that is sent out from the impeller 2 and flows in the gap between the peripheral wall 4c and the impeller 2 so as to be discharged to the outside of the scroll casing 4.

As shown in FIG. 1, the discharge portion 42 includes an extension plate 42b, a diffuser plate 42c, a first side plate 42d, a second side plate 42e, and the like. The extension plate 42b is formed integrally with the peripheral wall 4c so as to be smoothly continuous with the winding end 41b on the downstream side of the peripheral wall 4c. The diffuser plate 42c is formed integrally with the tongue portion 43 of the scroll casing 4 and faces the extension plate 42b. The diffuser plate 42c is formed at a predetermined angle with the extending plate 42b so that the cross-sectional area of the flow path gradually expands along the air flow direction in the discharge portion 42. The first side plate 42d is integrally formed with the side wall 4a of the scroll casing 4, and the second side plate 42e is integrally formed with the side wall 4a on the opposite side of the scroll casing 4. The first side plate 42d and the second side plate 42e are formed between the extension plate 42b and the diffuser plate 42c. As described above, the discharge portion 42 has a flow path having a rectangular cross section formed by the extending plate 42b, the diffuser plate 42c, the first side plate 42d, and the second side plate 42e.

(Tongue 43)
In the scroll casing 4, the 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 winding to the beginning of winding of the spiral flow path. The tongue portion 43 is provided in the upstream portion of the ventilation passage, and divides the air flow in the rotation direction R of the impeller 2 and the air flow in the discharge direction from the downstream portion of the ventilation passage toward the discharge port 42a. Has a role. Further, the static pressure of the air flow flowing into the discharge portion 42 increases while passing through the scroll casing 4, and the pressure becomes higher than that in the scroll casing 4. Therefore, the tongue portion 43 has a function of partitioning such a pressure difference.

(Detailed configuration of peripheral wall 4c)
FIG. 3 is a conceptual diagram illustrating the relationship between the peripheral wall 4c of the centrifugal blower 1 and the impeller 2 according to the first embodiment. FIG. 4 is a conceptual diagram illustrating the relationship between the peripheral wall 4c of the centrifugal blower 1A and the impeller 2 which is a modification of the centrifugal blower 1 according to the first embodiment. The reference peripheral wall LW shown by the alternate long and short dash line in FIGS. 3 and 4 represents the position of a general reference peripheral wall LW that linearly connects the side walls 4a facing each other in a cross section parallel to the axial direction of the rotating shaft RS. It was done.

The impeller 2 described above has a main plate 2a, a first blade portion 2d1, and a second blade portion 2d2. The first blade portion 2d1 and the second blade portion 2d2 are composed of a plurality of blades 2d and side plates 2c. More specifically, the first blade portion 2d1 is formed by an annular first side plate 2c1 arranged to face the main plate 2a and a plurality of blades 2d arranged between the main plate 2a and the first side plate 2c1. It is configured. The second blade portion 2d2 includes an annular second side plate 2c2 arranged opposite to the main plate 2a on the side opposite to the side where the first side plate 2c1 is arranged with respect to the main plate 2a, and the main plate 2a and the second side plate. It is composed of a plurality of blades 2d arranged between 2c2 and 2c2. The side plate 2c is a general term for the first side plate 2c1 and the second side plate 2c2, and the impeller 2 has the first side plate 2c1 on one side with respect to the main plate 2a in the axial direction of the rotating shaft RS, and the other. It has a second side plate 2c2 on the side of.

The first blade portion 2d1 is arranged on one plate surface side of the main plate 2a, and the second blade portion 2d2 is arranged on the other plate surface side of the main plate 2a. That is, the plurality of blades 2d are provided on both sides of the main plate 2a in the axial direction of the rotation axis RS, and the first blade portion 2d1 and the second blade portion 2d2 are provided back to back via the main plate 2a. ing. In FIGS. 3 and 4, the first blade portion 2d1 is arranged above the main plate 2a, and the second blade portion 2d2 is arranged below the main plate 2a. However, the first blade portion 2d1 and the second blade portion 2d2 need only be provided back to back via the main plate 2a, and the first blade portion 2d1 is arranged below the main plate 2a and is provided on the main plate 2a. On the other hand, the second blade portion 2d2 may be arranged above. In the following description, unless otherwise specified, the blade 2d is described as a general term for the first blade portion 2d1 and the second blade portion 2d2.

The peripheral wall 4c has a first peripheral wall 44a and a second peripheral wall 44b. In the direction orthogonal to the axial direction of the rotation axis RS of the impeller 2, the first peripheral wall 44a is a peripheral wall 4c facing the first blade portion 2d1, and the second peripheral wall 44b faces the second blade portion 2d2. It is a peripheral wall 4c.

Further, the peripheral wall 4c has a first bulging portion 4c1, a second bulging portion 4c2, and a minimum portion 142. The first bulging portion 4c1 is formed so as to face the first blade portion 2d1 in the radial direction of the impeller 2, and the second bulging portion 4c2 is formed so as to face the second blade portion 2d2. Has been done. That is, the first bulging portion 4c1 is formed on the first peripheral wall 44a, and the second bulging portion 4c2 is formed on the second peripheral wall 44b. The minimum portion 142 is formed so as to face the main plate 2a in the radial direction of the impeller 2. In the following description, the bulging portion 4c12 may be described as a general term for the first bulging portion 4c1 and the second bulging portion 4c2. The bulging portion 4c12 may be present in at least a part of the scroll casing 4 in the rotation direction R of the rotation axis RS, or is present in all the regions of the scroll casing 4 in the rotation direction R of the rotation axis RS. May be good.

The first bulging portion 4c1 is a portion formed so that the distance between the rotating shaft RS and the peripheral wall 4c is greater than or equal to the distance LS between the rotating shaft RS and the reference peripheral wall LW. In the first bulging portion 4c1, the distance R1 between the rotating shaft RS on the main plate 2a side of the impeller 2 and the peripheral wall 4c in the axial direction of the rotating shaft RS is the same as the rotating shaft RS on the side plate 2c side of the impeller 2. It is formed so as to be larger than the distance R2 between the peripheral wall 4c and the peripheral wall 4c. The first bulging portion 4c1 of the peripheral wall 4c has a first maximum portion 141c. In the first maximum portion 141c, the distance between the first peripheral wall 44a and the rotating shaft RS in the direction orthogonal to the axial direction of the rotating shaft RS of the impeller 2 becomes maximum in the axial direction of the rotating shaft RS. It is the position of one peripheral wall 44a. That is, the first maximum portion 141c is provided on the peripheral wall 4c of the portion facing the first blade portion 2d1. The first maximum portion 141c is formed on the main plate 2a side of the intermediate position between the main plate 2a and the first side plate 2c1 in the axial direction of the rotation shaft RS of the impeller 2. That is, the first maximum portion 141c is located between the main plate 2a and the first side plate 2c1 at a distance of half from the main plate 2a. In addition, in FIGS. 3 and 4, the distance R1 indicates the distance between the rotation axis RS and the peripheral wall 4c in the first maximum portion 141c. The distance R1 between the rotation shaft RS and the peripheral wall 4c in the first maximum portion 141c is set by the suction air volume of the centrifugal blower 1, and the bulging amount of the first bulging portion 4c1 is set.

Similarly, the second bulging portion 4c2 is a portion formed so that the distance between the rotating shaft RS and the peripheral wall 4c is greater than or equal to the distance LS between the rotating shaft RS and the reference peripheral wall LW. In the second bulging portion 4c2, the distance R11 between the rotating shaft RS on the main plate 2a side of the impeller 2 and the peripheral wall 4c in the axial direction of the rotating shaft RS is the same as the rotating shaft RS on the side plate 2c side of the impeller 2. It is formed so as to be larger than the distance R12 between the peripheral wall 4c and the peripheral wall 4c. The second bulging portion 4c2 of the peripheral wall 4c has a second maximum portion 141d. In the second maximum portion 141d, the distance between the second peripheral wall 44b and the rotation axis RS in the direction orthogonal to the axial direction of the rotation axis RS of the impeller 2 becomes maximum in the axial direction of the rotation axis RS. It is the position of the two peripheral walls 44b. That is, the second maximum portion 141d is provided on the peripheral wall 4c of the portion facing the second blade portion 2d2. The second maximum portion 141d is formed on the main plate 2a side of the intermediate position between the main plate 2a and the second side plate 2c2 in the axial direction of the rotation shaft RS of the impeller 2. That is, the second maximum portion 141d is located between the main plate 2a and the second side plate 2c2 at a distance of half from the main plate 2a. In addition, in FIGS. 3 and 4, the distance R11 indicates the distance between the rotation axis RS and the peripheral wall 4c in the second maximum portion 141d. The distance R11 between the rotation shaft RS and the peripheral wall 4c in the second maximum portion 141d is set by the suction air volume of the centrifugal blower 1, and the bulging amount of the second bulging portion 4c2 is set. In the following description, the maximum portion 141 will be described as a general term for the first maximum portion 141c and the second maximum portion 141d.

The minimum portion 142 is formed between the first bulging portion 4c1 and the second bulging portion 4c2 in the axial direction of the rotating shaft RS. The minimum portion 142 is formed so that the distance R13 between the rotating shaft RS and the peripheral wall 4c is smaller than the distance R1 and the distance R11 between the rotating shaft RS and the peripheral wall 4c in the maximum portion 141. The peripheral wall 4c has a minimum portion 142 between two maximum portions 141 in the axial direction of the rotation axis RS of the impeller 2. That is, the peripheral wall 4c of the scroll casing 4 minimizes the position where the distance between the peripheral wall 4c and the rotating shaft RS is smaller than the positions of the first maximum portion 141c and the second maximum portion 141d in the axial direction of the rotating shaft RS. When defined as the portion 142, the minimum portion 142 is provided at a position facing the main plate 2a.

In the scroll casing 4, in the axial direction of the rotation axis RS, the peripheral wall 4c between each of the first maximum portion 141c and the second maximum portion 141d and the minimum portion 142 is in a direction orthogonal to the axial direction of the rotation axis RS. It is formed so as to incline with respect to it. Further, the scroll casing 4 is formed so that the peripheral wall 4c between each of the first maximum portion 141c and the second maximum portion 141d and the minimum portion 142 is curved in the axial direction of the rotation axis RS. Is desirable. That is, it is desirable that the peripheral wall 4c has a continuous portion of the maximum portion 141 and the minimum portion 142 formed in an R shape. As shown in FIG. 4, the amount of protrusion of the minimum portion 142 on the impeller 2 side is arbitrary. The scroll casing 4 may be provided with, for example, a partition wall 143 in which the wall forming the minimum portion 142 is extended so that the amount of protrusion on the impeller 2 side is large. The partition wall 143 partitions a part of the space formed by the first bulging portion 4c1 and the impeller 2 and a part of the space formed by the second bulging portion 4c2 and the impeller 2. It is formed.

In the scroll casing 4, the first bulging portion 4c1 and the second bulging portion 4c2 increase the spiral radius on the main plate 2a side with respect to the side plate 2c side of the impeller 2. The scroll casing 4 has a maximum portion 141 for each of the first blade portion 2d1 and the second blade portion 2d2 by the first bulging portion 4c1, the second bulging portion 4c2, and the minimum portion 142. .. That is, the scroll casing 4 has two maximum portions 141, a first maximum portion 141c and a second maximum portion 141d, in the axial direction of the rotation axis RS.

FIG. 5 is a conceptual diagram of an example in which the relationship between the peripheral wall 4c of the centrifugal blower 1 and the impeller 2 according to the first embodiment is viewed from a direction parallel to the axial direction of the rotating shaft RS. FIG. 6 is a conceptual diagram of another example in which the relationship between the peripheral wall 4c of the centrifugal blower 1 and the impeller 2 according to the first embodiment is viewed from a direction parallel to the axial direction of the rotating shaft RS. FIG. 7 is a conceptual diagram of another example in which the relationship between the peripheral wall 4c of the centrifugal blower 1 and the impeller 2 according to the first embodiment is viewed from a direction parallel to the axial direction of the rotating shaft RS. Next, with reference to FIGS. 5 to 7, the position and range in which the bulging portion 4c12 is formed in the scroll casing 4 in the rotation direction R of the impeller 2 will be described.

As shown in FIGS. 5 and 6, the bulging portion 4c12 may be formed on a part of the scroll casing 4 in the rotation direction R of the impeller 2. That is, the first maximum portion 141c and the second maximum portion 141d are in the rotation direction of the impeller 2 when the boundary with the tongue portion 43 that divides the flow of the air blown from the impeller 2 is the winding start portion 41a. In R, it is formed in a part between the winding start portion 41a and the discharge port 42a of the scroll casing 4. When the bulging portion 4c12 is formed in a part of the scroll casing 4, the bulging portion 4c12 may be formed near the suction port of a unit such as an air conditioner in which the centrifugal blower 1 is installed. desirable. In the centrifugal blower 1 and the centrifugal blower 1A, by providing the bulging portion 4c12 at a position where the amount of air sucked is large, the air splitting described later can be performed more effectively.

As shown in FIG. 7, the bulging portion 4c12 may be continuously formed from the winding start portion 41a of the scroll casing 4 to the discharge port 42a in the rotation direction R of the impeller 2. In this case, the bulging portion 4c12 is provided not only in the scroll portion 41 but also in the discharging portion 42, and the bulging portion 4c12 is continuously formed on the peripheral wall 4c and the extending plate 42b. That is, the first maximum portion 141c and the second maximum portion 141d are in the rotation direction of the impeller 2 when the boundary with the tongue portion 43 that divides the flow of the air blown from the impeller 2 is the winding start portion 41a. In R, the winding start portion 41a is continuously formed between the winding start portion 41a and the discharge port 42a of the scroll casing 4.

[Operation example of centrifugal blower 1 and centrifugal blower 1A]
FIG. 8 is a conceptual diagram showing the air flow in the scroll casing 4 of the centrifugal blower 1 according to the first embodiment. FIG. 9 is a conceptual diagram showing the air flow in the scroll casing 4 of the centrifugal blower 1A, which is a modification of the centrifugal blower 1 according to the first embodiment. In addition, in FIG. 8 and FIG. 9, the solid line arrow in the scroll casing 4 shows an example of the wind flow.

When the impeller 2 rotates, the air outside the scroll casing 4 is sucked into the scroll casing 4 through the suction ports 5 formed on both sides of the impeller 2. At this time, the air sucked into the scroll casing 4 is guided by the bell mouth 3 and sucked into the impeller 2. The air sucked into the impeller 2 becomes an air flow to which dynamic pressure and static pressure are added in the process of passing between the plurality of blades 2d, and is blown out toward the outside in the radial direction of the impeller 2. The dynamic pressure of the airflow blown out from the impeller 2 is converted into static pressure while being guided between the inside of the peripheral wall 4c and the blade 2d by the scroll portion 41, and after passing through the scroll portion 41, it reaches the discharge portion 42. It is blown out of the scroll casing 4 from the formed discharge port 42a.

[Effects of Centrifugal Blower 1 and Centrifugal Blower 1A]
The airflow blown out by the rotation of the impeller 2 has a velocity distribution in the rotation axis RS direction of the impeller 2, and the velocity of the airflow is higher on the main plate 2a side than on the suction port 5 side. According to the present invention, in the centrifugal blower 1 and the centrifugal blower 1A, the first maximum portion 141c is formed on the main plate 2a side of the intermediate position between the main plate 2a and the first side plate 2c1 in the axial direction of the rotating shaft RS. The second maximum portion 141d is formed on the main plate 2a side of the intermediate position between the main plate 2a and the second side plate 2c2 in the axial direction of the rotating shaft RS. In the centrifugal blower 1 and the centrifugal blower 1A, the distance between the impeller 2 and the peripheral wall 4c of the scroll casing 4 is widened on the main plate 2a side rather than the side plate 2c side by the first maximum portion 141c and the second maximum portion 141d. Therefore, the air flowing in from the two suction ports 5 heads toward the peripheral wall 4c side when merging on the main plate 2a side, so that the turbulence of the air flow is suppressed. Therefore, in the centrifugal blower 1 and the centrifugal blower 1A, the pressure loss caused by the turbulence of the airflow is reduced, and the airflow can be efficiently boosted in the scroll casing 4.

Further, the scroll casing 4 has a main plate when the position where the distance between the peripheral wall 4c and the rotating shaft RS is smaller than the positions of the two maximum portions 141 in the axial direction of the rotating shaft RS is defined as the minimum portion 142. The minimum portion 142 is provided at a position facing 2a. In the centrifugal blower 1 and the centrifugal blower 1A, the airflow on the main plate 2a side is smoothly divided by the two maximum portions 141 and the minimum portion 142, so that the collision loss generated on the peripheral wall 4c can be reduced. Then, the air blown out from the impeller 2 is guided to the discharge port 42a while being boosted by widening the flow path width between the impeller 2 and the peripheral wall 4c, and is discharged. Further, when the partition wall 143 is provided by increasing the amount of protrusion of the minimum portion 142 to the impeller 2 as shown in FIG. 9, the centrifugal blower 1 and the centrifugal blower 1A merge at the position of the main plate 2a by both suctions. The airflow can be further rectified, and the airflow can be efficiently boosted.

Further, in the scroll casing 4, in the axial direction of the rotation axis RS, the peripheral wall 4c between each of the first maximum portion 141c and the second maximum portion 141d and the minimum portion 142 is orthogonal to the axial direction of the rotation axis RS. It is tilted with respect to the direction. Therefore, when the flow of air flowing in from the suction port 5 merges on the main plate 2a side, it tends to move from the minimum portion 142 to the two maximum portions 141 sides, and the turbulence of the air flow is suppressed. Therefore, in the centrifugal blower 1 and the centrifugal blower 1A, the pressure loss caused by the turbulence of the airflow is reduced, and the airflow can be efficiently boosted in the scroll casing 4.

Further, in the scroll casing 4, the peripheral wall 4c between each of the first maximum portion 141c and the second maximum portion 141d and the minimum portion 142 is curved in the axial direction of the rotation axis RS. Therefore, when the flow of air flowing in from the suction port 5 merges on the main plate 2a side, it tends to move from the minimum portion 142 to the two maximum portions 141 sides, and the turbulence of the air flow is suppressed. Further, since the airflow merging at the main plate 2a easily flows along the curvature of the peripheral wall 4c, the centrifugal blower 1 and the centrifugal blower 1A further reduce the pressure loss due to the turbulence of the airflow, and the airflow in the scroll casing 4 Can be efficiently boosted.

Further, the first maximum portion 141c and the second maximum portion 141d are formed in a part between the winding start portion 41a and the discharge port 42a of the scroll casing 4 in the rotation direction R of the impeller 2. The centrifugal blower 1 and the centrifugal blower 1A further reduce the pressure loss due to the turbulence of the air flow by forming the two maximum portions 141 at the places where the suction air volume is large in the unit 60, and make the air flow in the scroll casing 4. It can be boosted efficiently.

Further, the first maximum portion 141c and the second maximum portion 141d may be continuously formed between the winding start portion 41a and the discharge port 42a of the scroll casing 4 in the rotation direction R of the impeller 2. By forming the centrifugal blower 1 and the scroll casing 4 of the centrifugal blower 1A in this configuration, the centrifugal blower 1 and the centrifugal blower 1A can be mounted on various units 60 without specifying a location having a large suction air volume. can.

Embodiment 2.
[Centrifugal blower 1]
FIG. 10 is a conceptual diagram illustrating the relationship between the peripheral wall 4c of the centrifugal blower 1B and the impeller 2 according to the second embodiment. The parts having the same configuration as the centrifugal blower 1 and the like shown in FIGS. 1 to 9 are designated by the same reference numerals, and the description thereof will be omitted. The centrifugal blower 1B according to the second embodiment has a different shape of the peripheral wall 4c in the centrifugal blower 1 according to the first embodiment. Therefore, in the following description, the configuration of the peripheral wall 4c of the centrifugal blower 1B according to the second embodiment will be mainly described with reference to FIG.

In the centrifugal blower 1B, the maximum value of the distance between the impeller 2 and the peripheral wall 4c is different on both side plates 2c side with the main plate 2a as a boundary. The peripheral wall 4c has a first bulging portion 4c1, a second bulging portion 4c22, and a minimum portion 142. The configuration of the first bulging portion 4c1 is the same as that of the centrifugal blower 1 according to the first embodiment.

The second bulging portion 4c22 is a portion formed so that the distance between the rotating shaft RS and the peripheral wall 4c is greater than or equal to the distance LS between the rotating shaft RS and the reference peripheral wall LW. In the second bulging portion 4c22, the distance R111 between the rotating shaft RS on the main plate 2a side of the impeller 2 and the peripheral wall 4c in the axial direction of the rotating shaft RS is the same as the rotating shaft RS on the side plate 2c side of the impeller 2. It is formed so as to be larger than the distance R112 between the peripheral wall 4c and the peripheral wall 4c. Further, in the second bulging portion 4c22, the distance R111 between the rotating shaft RS and the peripheral wall 4c is the distance between the rotating shaft RS of the first bulging portion 4c1 and the peripheral wall 4c in the axial direction of the rotating shaft RS. It is formed so as to be larger than R1. As described above, the distance R1 indicates the distance between the rotation axis RS and the peripheral wall 4c in the first maximum portion 141c. That is, in the centrifugal blower 1B according to the second embodiment, the sizes of the first bulging portion 4c1 and the second bulging portion 4c2 are different, and the size between the peripheral wall 4c of the second maximum portion 141d and the rotation axis RS is different. The first distance is larger than the second distance between the peripheral wall 4c of the first maximum portion 141c and the rotation axis RS. The first distance is the distance R111, and the second distance is the distance R1.

The second bulging portion 4c22 of the peripheral wall 4c has a second maximum portion 141d that maximizes the distance between the rotating shaft RS and the peripheral wall 4c in the axial direction of the rotating shaft RS of the impeller 2. The second maximum portion 141d is provided on the peripheral wall 4c of the portion facing the second blade portion 2d2. The second maximum portion 141d is formed on the main plate 2a side of the intermediate position between the main plate 2a and the side plate 2c in the axial direction of the rotation shaft RS of the impeller 2. That is, the second maximum portion 141d is located between the main plate 2a and the side plate 2c at a distance of half from the main plate 2a. In FIG. 10, the distance R111 indicates the distance between the rotation axis RS and the peripheral wall 4c in the second maximum portion 141d. The distance R111 between the rotation shaft RS and the peripheral wall 4c in the second maximum portion 141d is set by the suction air volume of the centrifugal blower 1, and the bulging amount of the second bulging portion 4c22 is set. The positions of the first bulging portion 4c1 and the second bulging portion 4c22 with respect to the main plate 2a may be opposite to the positions shown in FIG. By providing the second bulging portion 4c22 on the side where the amount of air sucked is large with respect to the main plate 2a, the centrifugal blower 1B can further effectively divide the air.

The minimum portion 142 is formed between the first bulging portion 4c1 and the second bulging portion 4c22 in the axial direction of the rotating shaft RS. The minimum portion 142 is formed so that the distance R13 between the rotating shaft RS and the peripheral wall 4c is smaller than the distance R1 and the distance R11 between the rotating shaft RS and the peripheral wall 4c in the maximum portion 141. That is, the peripheral wall 4c has a minimum portion 142 between two maximum portions 141 in the radial direction of the impeller 2.

FIG. 11 is a conceptual diagram illustrating the relationship between the peripheral wall 4c of the centrifugal blower 1C and the impeller 2 which is a modification of the centrifugal blower 1B according to the second embodiment. As shown in FIG. 11, the amount of protrusion of the minimum portion 142 on the impeller 2 side is arbitrary. The scroll casing 4 may be provided with, for example, a partition wall 143 in which the wall forming the minimum portion 142 is extended so that the amount of protrusion on the impeller 2 side is large. The partition wall 143 partitions a part of the space formed by the first bulging portion 4c1 and the impeller 2 and a part of the space formed by the second bulging portion 4c22 and the impeller 2. It is formed.

FIG. 12 is a conceptual diagram showing the relationship between the centrifugal blower 1C and the resistor using the main part configuration of the unit 60. FIG. 13 is another conceptual diagram showing the relationship between the centrifugal blower 1C and the resistor by using the main part configuration of the unit 60. 12 and 13 show the centrifugal blower 1C arranged in the unit 60. The unit 60 is a general term for a blower device 30 or an air conditioner 40, which will be described later. Further, the wall surface portion 61 is a wall surface of the case 7 of the blower device 30 or the case 16 of the air conditioner 40, which will be described later. Further, in FIGS. 12 and 13, the wall surface portion 61 and the motor 6 are resistors for the air flow flowing into the centrifugal blower 1C. The motor 6 is a resistor arranged at a position facing the wall surface portion 61 of the case 16 and obstructing the flow of air.

The centrifugal blower 1C has a second bulging portion 4c22 on the side where the distance between the scroll casing 4 and the resistor located at a position facing the side wall 4a is larger than that of the main plate 2a. The reason why the second bulging portion 4c22 is formed in this way is that the larger the distance between the scroll casing 4 and the resistor located at the position facing the side wall 4a, the larger the suction air volume.

Specifically, the larger distance when comparing the third distance between one side wall 4a of the scroll casing 4 and the wall surface portion 61 and the fourth distance between the motor 6 and the other side wall 4a. The second maximum portion 141d is arranged there, and the first maximum portion 141c is arranged on the side with the smaller distance. In other words, the third distance between the wall surface portion 61 and the first side wall 4a1 or the second side wall 4a2 facing the wall surface portion 61, and the motor 6 and the first side wall 4a1 or the second side wall 4a2 facing the motor 6. When compared with the fourth distance between them, the second maximum portion 141d is arranged on the larger distance side, and the first maximum portion 141c is arranged on the smaller distance side. The third distance is the distance L1 shown in FIGS. 12 and 13, and the fourth distance is the distance L2 shown in FIGS. 12 and 13. For example, in the scroll casing 4, the distance L2 between the side wall 4a of the scroll casing 4 and the motor 6 which is the airflow resistor is larger than the distance L1 between the side wall 4a and the wall surface 61 which is the airflow resistor. If it is large, the second bulging portion 4c22 is arranged on the motor 6 side. Further, in the scroll casing 4, the distance L1 between the side wall 4a of the scroll casing 4 and the wall surface portion 61 which is the airflow resistor is larger than the distance L2 between the side wall 4a and the motor 6 which is the airflow resistor. If it is large, the second bulging portion 4c22 is arranged on the wall surface portion 61 side. In FIGS. 12 and 13, the relationship with the resistor has been described using the centrifugal blower 1C, but the same effect can be obtained by using the centrifugal blower 1B instead of the centrifugal blower 1C.

[Effects of Centrifugal Blower 1B and Centrifugal Blower 1C]
FIG. 14 is a conceptual diagram showing the air flow in the scroll casing 4 of the centrifugal blower 1B according to the second embodiment. FIG. 15 is a conceptual diagram showing the air flow in the scroll casing 4 of the centrifugal blower 1C, which is a modification of the centrifugal blower 1B according to the second embodiment. The airflow blown out by the rotation of the impeller 2 has a velocity distribution in the rotation axis RS direction of the impeller 2, and the velocity of the airflow is higher on the main plate 2a side than on the suction port 5 side.

As shown in FIGS. 14 and 15, the airflow on the main plate 2a side is smoothly divided by the first bulging portion 4c1, the second bulging portion 4c22, and the minimum portion 142, so that the collision loss occurs on the peripheral wall 4c. Can be reduced. Then, the air blown out from the impeller 2 is guided to the discharge port 42a while being boosted by widening the flow path width between the impeller 2 and the peripheral wall 4c at the bulging portion 4c12 and discharged. Like the centrifugal blower 1 and the centrifugal blower 1A, the centrifugal blower 1B and the centrifugal blower 1C can rectify the airflow merging at the position of the main plate 2a by both suctions, and can efficiently boost the pressure.

In the centrifugal blower 1B and the centrifugal blower 1C, the first distance between the peripheral wall 4c of the second maximum portion 141d and the rotating shaft RS is larger than the second distance between the peripheral wall 4c of the first maximum portion 141c and the rotating shaft RS. Is also big. Therefore, the centrifugal blower 1B and the centrifugal blower 1C change the distance between the impeller 2 and the peripheral wall 4c according to the wind speed even if the suction air volumes of both suction ports 5 are different under the mounting on the unit. Is possible, and the pressure can be increased more efficiently.

Embodiment 3.
[Blower 30]
FIG. 16 is a diagram showing a configuration of a blower device 30 according to a third embodiment. Parts having the same configuration as the centrifugal blower 1 and the like shown in FIGS. 1 to 15 are designated by the same reference numerals, and the description thereof will be omitted. The blower 30 according to the third embodiment is, for example, a ventilation fan, a tabletop fan, or the like. The blower 30 includes a centrifugal blower 1B, a case 7 accommodating the centrifugal blower 1B, and a motor 6.

The case 7 is formed with two openings, a case suction port 71 through which the gas flowing into the centrifugal blower 1B passes, and a case discharge port 72 through which the gas blown out from the centrifugal blower 1B passes. As shown in FIG. 16, the blower device 30 is formed at a position where the case suction port 71 and the case discharge port 72 face each other. In the blower device 30, for example, either the case suction port 71 or the case discharge port 72 is formed above or below the centrifugal blower 1B, so that the case suction port 71 and the case discharge port 72 are necessarily opposed to each other. It does not have to be formed at the desired position. Inside the case 7, a space SP1 having a portion where the case suction port 71 is formed and a space SP2 having a portion where the case discharge port 72 is formed are partitioned by a partition plate 73. The centrifugal blower 1B is installed in a state where the suction port 5 is located in the space SP1 on the side where the case suction port 71 is formed and the discharge port 42a is located in the space SP2 on the side where the case discharge port 72 is formed. NS.

The motor 6 rotates the impeller 2 of the centrifugal blower 1B. The motor 6 is arranged in a space surrounded by the first blade portion 2d1 of the impeller 2 and the main plate 2a. Therefore, since the motor 6 acts as an airflow resistor in the centrifugal blower 1B, the suction air volume on the second blade portion 2d2 side is larger than the suction air volume on the first blade portion 2d1 side. In the centrifugal blower 1B, a second bulging portion 4c22 having a larger distance between the rotation shaft RS and the peripheral wall 4c than the first bulging portion 4c1 is arranged on the second blade portion 2d2 side having a large suction air volume. There is. Further, the peripheral wall 4c is formed so that the first maximum portion 141c and the second maximum portion 141d bulge toward the case suction port 71.

[Operation example of blower device 30]
In the blower device 30, when the impeller 2 is rotated by the drive of the motor 6, air is sucked into the case 7 through the case suction port 71. The air sucked into the case 7 is guided by the bell mouth 3 and sucked into the impeller 2. The air sucked into the impeller 2 is blown out toward the outside in the radial direction of the impeller 2. The air blown out from the impeller 2 passes through the inside of the scroll casing 4, is blown out from the discharge port 42a of the scroll casing 4, and is blown out from the case discharge port 72 of the case 7.

[Action and effect of blower 30]
In the blower device 30, the first distance between the peripheral wall 4c of the second maximum portion 141d of the centrifugal blower 1B and the rotating shaft RS is larger than the second distance between the peripheral wall 4c of the first maximum portion 141c and the rotating shaft RS. Is also big. The motor 6 is arranged in a space surrounded by the first blade portion 2d1 and the main plate 2a. Therefore, the centrifugal blower 1B of the blower 30 can change the distance between the impeller 2 and the peripheral wall 4c according to the wind speed even if the suction air volumes of both suction ports 5 differ depending on the presence or absence of the motor 6. It can be boosted efficiently.

Further, the blower device 30 includes a centrifugal blower 1B having a first bulging portion 4c1 and a second bulging portion 4c22. The centrifugal blower 1B can change the distance between the impeller 2 and the peripheral wall 4c according to the wind speed even if the suction air volumes of both suction ports 5 are different under the mounting of the blower device 30, and the pressure is increased more efficiently. can do. Since the blower 30 includes the centrifugal blower 1B, the pressure can be efficiently increased by the scroll portion 41.

Further, the peripheral wall 4c of the centrifugal blower 1B constituting the blower 30 is formed so that the first maximum portion 141c and the second maximum portion 141d bulge toward the case suction port 71. The centrifugal blower 1B constituting the blower 30 further reduces the pressure loss due to the turbulence of the air flow by forming the two maximum portions 141 at the places where the suction air volume is large in the unit 60, and in the scroll casing 4. The air flow can be boosted efficiently.

The blower 30 may not be arranged in the space surrounded by the first blade portion 2d1 but may be arranged outside the scroll casing 4. In this case, in the blower device 30, the second bulging portion 4c22 of the centrifugal blower 1B is positioned on the side having a large suction air volume depending on the distance between the side wall 4a and the wall portion of the case 7 or the distance between the side wall 4a and the motor 6. It is configured to do. For example, the centrifugal blower 1B compares a third distance between one side wall 4a of the scroll casing 4 and the wall surface 61 with a fourth distance between the motor 6 and the other side wall 4a. When the third distance and the fourth distance are compared, the second maximum portion 141d is arranged on the larger distance side, and the first maximum portion 141c is arranged on the smaller distance side. As a result, the centrifugal blower 1B of the blower 30 can change the distance between the impeller 2 and the peripheral wall 4c according to the wind speed even if the suction air volumes of both suction ports 5 differ depending on the presence or absence of the motor 6. The pressure can be increased more efficiently.

When the amount of air sucked from both suction ports 5 is substantially the same in the blower 30, the blower 30 can use the centrifugal blower 1 or the like according to the first embodiment. That is, the blower 30 includes any one or more of the centrifugal blower 1, the centrifugal blower 1A, the centrifugal blower 1B, and the centrifugal blower 1C as the built-in blower.

Embodiment 4.
[Air conditioner 40]
FIG. 17 is a perspective view conceptually showing an example of the air conditioner 40 according to the fourth embodiment. FIG. 18 is a conceptual diagram showing an example of the internal configuration of the air conditioner 40 according to the fourth embodiment. FIG. 19 is a side view conceptually showing an example of the internal configuration of the air conditioner 40 according to the fourth embodiment. FIG. 20 is a side view showing an internal configuration of a modified example of the air conditioner 40 according to the fourth embodiment. The parts having the same configuration as the centrifugal blower 1 and the like shown in FIGS. 1 to 16 are designated by the same reference numerals, and the description thereof will be omitted. Further, in FIG. 18, the upper surface portion 16a is omitted in order to show the internal configuration of the air conditioner 40. The air conditioner 40 according to the fourth embodiment is arranged at a position facing one or more of the centrifugal blower 1, the centrifugal blower 1A, the centrifugal blower 1B or the centrifugal blower 1C, and the discharge port 42a of the centrifugal blower 1 and the like. The heat exchanger 10 is provided. Further, the air conditioner 40 according to the fourth embodiment includes a case 16 installed behind the ceiling of the room to be air-conditioned. In the following description, when the term "centrifugal blower 1" is used, it is assumed to be any one of the centrifugal blower 1, the centrifugal blower 1A, the centrifugal blower 1B, and the centrifugal blower 1C.

(Case 16)
As shown in FIG. 17, the case 16 is formed in a rectangular parallelepiped shape including an upper surface portion 16a, a lower surface portion 16b, and a side surface portion 16c. The shape of the case 16 is not limited to a rectangular parallelepiped shape, and may be other shapes such as a cylindrical shape, a prismatic shape, a conical shape, a shape having a plurality of corners, and a shape having a plurality of curved surfaces. There may be. The case 16 has a side surface portion 16c on which a case discharge port 17 is formed as one of the side surface portions 16c. The shapes of the case discharge port 17 and the case suction port 18 are formed in a rectangular shape as shown in FIG. The shapes of the case discharge port 17 and the case suction port 18 are not limited to a rectangular shape, and may be, for example, a circular shape, an oval shape, or any other shape. The case 16 has a side surface portion 16c in which the case suction port 18 is formed on a surface of the side surface portion 16c that is the back surface of the surface on which the case discharge port 17 is formed. A filter for removing dust in the air may be arranged at the case suction port 18. The case suction port 18 may be formed at a position perpendicular to the axial direction of the rotation axis RS of the centrifugal blower 1. For example, as shown in FIG. 20, the case suction port 18a is formed on the lower surface portion 16b. May be good. In the case of the air conditioner 40 shown in FIG. 19, the side surface portion 16c is the wall portion of the case 16 in which the case suction port 18 is formed, and in the case of the air conditioner 40 shown in FIG. 20, the lower surface portion 16b is. It is a wall portion of the case 16 in which the case suction port 18a is formed.

Inside the case 16, two centrifugal blowers 1, a motor 6, and a heat exchanger 10 are housed. The centrifugal blower 1 includes an impeller 2 and a scroll casing 4 on which a bell mouth 3 is formed. The motor 6 is supported by a motor support 9a fixed to the upper surface portion 16a of the case 16. The motor 6 has an output shaft 6a. The output shaft 6a is arranged so as to extend parallel to the surface on which the case suction port 18 is formed and the surface on which the case discharge port 17 is formed in the side surface portion 16c. In the air conditioner 40, as shown in FIG. 18, two impellers 2 are attached to the output shaft 6a. The impeller 2 forms a flow of air that is sucked into the case 16 from the case suction port 18 and blown out from the case discharge port 17 to the air-conditioned space. The centrifugal blower 1 arranged in the case 16 is not limited to two, and may be one or three or more.

As shown in FIG. 18, the centrifugal blower 1 is attached to a partition plate 19, and the internal space of the case 16 includes a space SP11 on the suction side of the scroll casing 4 and a space SP12 on the blowout side of the scroll casing 4. , It is partitioned by a partition plate 19.

As shown in FIG. 19, the heat exchanger 10 is arranged at a position facing the discharge port 42a of the centrifugal blower 1, and is arranged in the case 16 on the air passage of the air discharged by the centrifugal blower 1. The heat exchanger 10 adjusts the temperature of the air that is sucked into the case 16 from the case suction port 18 and blown out from the case discharge port 17 into the air-conditioned space. As the heat exchanger 10, a heat exchanger 10 having a known structure can be applied.

In the case 16 of the air conditioner 40, the centrifugal blower 1 is housed so that the bulging portion 4c12 is arranged on the covering side of the suction air volume. For example, as shown in FIG. 19, the air conditioner 40 has a built-in centrifugal blower 1 so that the bulging portion 4c12 is arranged on the side of the case suction port 18. Further, as shown in FIG. 20, the air conditioner 40 has a built-in centrifugal blower 1 so that the bulging portion 4c12 is arranged on the side of the case suction port 18a. That is, the peripheral wall 4c of the centrifugal blower 1 is formed so that the first maximum portion 141c and the second maximum portion 141d bulge toward the case suction port 18 or the case suction port 18a.

[Operation example of air conditioner 40]
When the impeller 2 is rotated by the drive of the motor 6, the air in the air-conditioned space is sucked into the case 16 through the case suction port 18 or the case suction port 18a. The air sucked into the case 16 is guided by the bell mouth 3 and sucked into the impeller 2. The air sucked into the impeller 2 is blown out toward the outside in the radial direction of the impeller 2. The air blown out from the impeller 2 passes through the inside of the scroll casing 4, is blown out from the discharge port 42a of the scroll casing 4, and is supplied to the heat exchanger 10. The air supplied to the heat exchanger 10 is heat-exchanged as it passes through 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 case discharge port 17 into the air-conditioned space.

[Action and effect of air conditioner 40]
Since the air conditioner 40 according to the fourth embodiment includes the centrifugal blower 1 and the like according to the first embodiment, the scroll unit 41 can efficiently boost the air flow.

Embodiment 5.
[Refrigeration cycle device 50]
FIG. 21 is a diagram showing the configuration of the refrigeration cycle device 50 according to the fifth embodiment. The indoor blower 202 of the refrigeration cycle device 50 according to the fifth embodiment uses any one or more of the centrifugal blower 1, the centrifugal blower 1A, the centrifugal blower 1B, and the centrifugal blower 1C. Further, in the following description, the case where the refrigeration cycle device 50 is used for air conditioning applications will be described, but the refrigeration cycle device 50 is not limited to those used for air conditioning applications. The refrigeration cycle device 50 is used for refrigeration or air conditioning applications such as refrigerators or freezers, vending machines, air conditioners, refrigeration devices, and water heaters.

The refrigeration cycle device 50 according to the fifth embodiment heats or cools the room by transferring heat between the outside air and the air in the room via a refrigerant to perform air conditioning. The refrigeration cycle device 50 according to the fifth embodiment includes an outdoor unit 100 and an indoor unit 200. In the refrigeration cycle device 50, the outdoor unit 100 and the indoor unit 200 are connected by a refrigerant pipe 300 and a refrigerant pipe 400 to form a refrigerant circuit in which a refrigerant circulates. The refrigerant pipe 300 is a gas pipe through which a gas phase refrigerant flows, and the refrigerant pipe 400 is a liquid pipe through which a liquid phase refrigerant flows. A gas-liquid two-phase refrigerant may flow through the refrigerant pipe 400. In the refrigerant circuit of the refrigeration cycle device 50, the compressor 101, the flow path switching device 102, the outdoor heat exchanger 103, the expansion valve 105, and the indoor heat exchanger 201 are sequentially connected via the refrigerant pipe.

(Outdoor unit 100)
The outdoor unit 100 includes a compressor 101, a flow path switching device 102, an outdoor heat exchanger 103, and an expansion valve 105. The compressor 101 compresses and discharges the sucked refrigerant. The flow path switching device 102 is, for example, a four-way valve, which switches the direction of the refrigerant flow path. The refrigeration cycle device 50 can realize a heating operation or a cooling operation by switching the flow of the refrigerant by using the flow path switching device 102 based on the instruction from the control device 110.

The outdoor heat exchanger 103 exchanges heat between the refrigerant and the outdoor air. The outdoor heat exchanger 103 acts as an evaporator during the heating operation, exchanges heat between the low-pressure refrigerant flowing from the refrigerant pipe 400 and the outdoor air, and evaporates and vaporizes the refrigerant. The outdoor heat exchanger 103 acts as a condenser during the cooling operation, and exchanges heat between the compressed refrigerant and the outdoor air by the compressor 101 flowing in from the flow path switching device 102 side to exchange the refrigerant. Condense and liquefy. The outdoor heat exchanger 103 is provided with an outdoor blower 104 in order to improve the efficiency of heat exchange between the refrigerant and the outdoor air. The outdoor blower 104 may be equipped with an inverter device to change the operating frequency of the fan motor to change the rotation speed of the fan. The expansion valve 105 is a throttle device (flow rate control means), functions as an expansion valve by adjusting the flow rate of the refrigerant flowing through the expansion valve 105, and adjusts the pressure of the refrigerant by changing the opening degree. For example, when the expansion valve 105 is composed of an electronic expansion valve or the like, the opening degree is adjusted based on the instruction of the control device 110.

(Indoor unit 200)
The indoor unit 200 includes an indoor heat exchanger 201 that exchanges heat between the refrigerant and the indoor air, and an indoor blower 202 that adjusts the flow of air that the indoor heat exchanger 201 exchanges heat with. The indoor heat exchanger 201 acts as a condenser during the heating operation, exchanges heat between the refrigerant flowing in from the refrigerant pipe 300 and the indoor air, condenses the refrigerant and liquefies it, and moves it to the refrigerant pipe 400 side. Let it flow out. The indoor heat exchanger 201 acts as an evaporator during the cooling operation, exchanges heat between the refrigerant put into a low pressure state by the expansion valve 105 and the indoor air, and causes the refrigerant to take away the heat of the air and evaporate it. It is vaporized and discharged to the refrigerant pipe 300 side. The indoor blower 202 is provided so as to face the indoor heat exchanger 201. One or more of the centrifugal blower 1 according to the first embodiment and the centrifugal blower 1 according to the second embodiment is applied to the indoor blower 202. The operating speed of the indoor blower 202 is determined by the user's setting. An inverter device may be attached to the indoor blower 202 to change the operating frequency of the fan motor (not shown) to change the rotation speed of the impeller 2.

[Operation example of refrigeration cycle device 50]
Next, a cooling operation operation will be described as an operation example of the refrigeration cycle device 50. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 101 flows into the outdoor heat exchanger 103 via the flow path switching device 102. The gas refrigerant that has flowed into the outdoor heat exchanger 103 is condensed by heat exchange with the outside air blown by the outdoor blower 104, becomes a low-temperature refrigerant, and flows out of the outdoor heat exchanger 103. The refrigerant flowing out of the outdoor heat exchanger 103 is expanded and depressurized by the expansion valve 105 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant flows into the indoor heat exchanger 201 of the indoor unit 200, evaporates by heat exchange with the indoor air blown by the indoor blower 202, becomes a low-temperature low-pressure gas refrigerant, and becomes an indoor heat exchanger. Outflow from 201. At this time, the indoor air that has been cooled by being absorbed by the refrigerant becomes air-conditioned air and is blown out from the discharge port of the indoor unit 200 into the air-conditioned space. The gas refrigerant flowing out of the indoor heat exchanger 201 is sucked into the compressor 101 via the flow path switching device 102 and compressed again. The above operation is repeated.

Next, a heating operation operation will be described as an operation example of the refrigeration cycle device 50. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 101 flows into the indoor heat exchanger 201 of the indoor unit 200 via the flow path switching device 102. The gas refrigerant that has flowed into the indoor heat exchanger 201 is condensed by heat exchange with the indoor air blown by the indoor blower 202, becomes a low-temperature refrigerant, and flows out of the indoor heat exchanger 201. At this time, the indoor air that has been warmed by receiving heat from the gas refrigerant becomes air-conditioned air and is blown out from the discharge port of the indoor unit 200 into the air-conditioned space. The refrigerant flowing out of the indoor heat exchanger 201 is expanded and depressurized by the expansion valve 105 to become a low-temperature low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant flows into the outdoor heat exchanger 103 of the outdoor unit 100, evaporates by heat exchange with the outside air blown by the outdoor blower 104, becomes a low-temperature low-pressure gas refrigerant, and becomes the outdoor heat exchanger 103. Outflow from. The gas refrigerant flowing out of the outdoor heat exchanger 103 is sucked into the compressor 101 via the flow path switching device 102 and compressed again. The above operation is repeated.

Since the refrigeration cycle device 50 according to the fifth embodiment includes the centrifugal blower 1 and the like according to the first embodiment, the scroll unit 41 can efficiently boost the air flow.

The configuration shown in the above embodiment is an example, and can be combined with another known technique, or a part of the configuration may be omitted or changed without departing from the gist. It is possible.

1 Centrifugal blower, 1A Centrifugal blower, 1B Centrifugal blower, 1C Centrifugal blower, 2 Impeller, 2a Main plate, 2a1 Peripheral part, 2b Shaft part, 2c side plate, 2c1 First side plate, 2c2
2nd side plate, 2d blade, 2d1 1st blade part, 2d2 2nd blade part, 2e suction port, 3
Bellmouth, 4 scroll casing, 4a side wall, 4a1 first side wall, 4a2 second side wall, 4c peripheral wall, 4c1 first bulge, 4c12 bulge, 4c2 second bulge, 4c22 second bulge, 5 Suction port, 5a 1st suction port, 5b 2nd suction port, 6 motor, 6a output shaft, 7 case, 9a motor support, 10 heat exchanger, 16 case, 16a upper surface, 16b lower surface, 16c side surface, 17 Case discharge port, 18 case suction port, 18a case suction port, 19 partition plate, 30 blower, 40 air conditioner, 41 scroll part, 41a winding start part, 41b winding end part, 42 discharge part, 42a discharge port, 42b Extension plate, 42c diffuser plate, 42d first side plate, 42e second side plate, 43
Tongue, 44a 1st peripheral wall, 44b 2nd peripheral wall, 50 refrigeration cycle device, 60 units, 61 wall surface, 71 case suction port, 72 case discharge port, 73 partition plate, 100 outdoor unit, 101 compressor, 102 flow path Switching device, 103 outdoor heat exchanger, 104 outdoor blower, 105 expansion valve, 110 control device, 141 maximum part, 141c 1st maximum part, 141d 2nd maximum part, 142 minimum part, 143 partition wall, 200 indoor unit, 201 Indoor heat exchanger, 202 indoor blower, 300 refrigerant piping, 400 refrigerant piping.

Claims (14)

A main plate that is rotationally driven, an annular first side plate that is arranged so as to face the main plate, and a first blade portion that is composed of a plurality of blades that are arranged between the main plate and the first side plate. , An annular second side plate arranged opposite to the main plate on the side opposite to the side on which the first side plate is arranged with respect to the main plate, and arranged between the main plate and the second side plate. An impeller having a second blade portion composed of a plurality of blades, and an impeller.
A peripheral wall formed in a spiral shape, a first side wall formed with a first suction port facing the plate surface of the main plate on the side on which the first side plate is arranged, and a side on which the second side plate is arranged. A scroll casing having a second side wall formed with a second suction port facing the plate surface of the main plate and accommodating the impeller.
With
The peripheral wall facing the first blade portion is defined as the first peripheral wall and the peripheral wall facing the second blade portion is defined as the second peripheral wall.
The position of the first peripheral wall where the distance between the first peripheral wall and the rotating shaft in the direction orthogonal to the axial direction of the rotating shaft of the impeller is maximum in the axial direction is defined as the first maximum portion. Define and
When the position of the second peripheral wall where the distance between the second peripheral wall and the rotation axis in the direction orthogonal to the axial direction is maximum in the axial direction is defined as the second maximum portion,
The first maximum portion is formed on the main plate side of the intermediate position between the main plate and the first side plate in the axial direction, and the second maximum portion is formed on the main plate side in the axial direction. A centrifugal blower formed on the main plate side of the intermediate position between the second side plate and the second side plate. In the peripheral wall, when the position where the distance between the peripheral wall and the rotation axis is smaller than the positions of the first maximum portion and the second maximum portion is defined as the minimum portion.
The centrifugal blower according to claim 1, wherein the peripheral wall has the minimum portion at a position facing the main plate. The scroll casing
The centrifugal blower according to claim 2, wherein the peripheral wall between each of the first maximum portion and the second maximum portion and the minimum portion is inclined with respect to a direction orthogonal to the axial direction. The scroll casing
The centrifugal blower according to claim 3, wherein the peripheral wall between each of the first maximum portion and the second maximum portion and the minimum portion is curved. The first maximum portion and the second maximum portion are
When the boundary with the tongue portion that divides the flow of air blown out from the impeller is the winding start portion, in the rotation direction of the impeller, between the winding start portion and the discharge port of the scroll casing. The centrifugal blower according to any one of claims 1 to 4, which is partially formed. The first maximum portion and the second maximum portion are
When the boundary with the tongue portion that divides the flow of air blown out from the impeller is the winding start portion, in the rotation direction of the impeller, between the winding start portion and the discharge port of the scroll casing. The centrifugal blower according to any one of claims 1 to 4, which is continuously formed. The first aspect of any one of claims 1 to 6, wherein the first distance between the second maximum portion and the rotating shaft is larger than the second distance between the first maximum portion and the rotating shaft. Centrifugal blower. Further equipped with a motor for rotating the main plate,
The centrifugal blower according to claim 7, wherein the motor is arranged in a space surrounded by the first blade portion and the main plate. The centrifugal blower according to any one of claims 1 to 8.
A case for accommodating the centrifugal blower and
A blower equipped with. The centrifugal blower according to claim 7 and
A case for accommodating the centrifugal blower and
A resistor arranged at a position facing the wall surface of the case and obstructing the flow of air,
With
The centrifugal blower
A third distance between the wall surface portion and the first side wall or the second side wall facing the wall surface portion, the resistor, and the first side wall or the second side wall facing the resistor. A blower having the scroll casing in which the second maximum portion is arranged on the larger distance side and the first maximum portion is arranged on the smaller distance side when compared with the fourth distance between the two. The case is formed with a case suction port through which the gas flowing into the centrifugal blower passes.
The blower according to claim 9 or 10, wherein the peripheral wall is formed so that the first maximum portion and the second maximum portion bulge toward the case suction port. The centrifugal blower according to any one of claims 1 to 8.
A heat exchanger located at a position facing the discharge port of the centrifugal blower,
An air conditioner equipped with. A case for accommodating the centrifugal blower and the heat exchanger and having a wall portion formed with a case suction port through which a gas flowing into the centrifugal blower passes is further provided.
The air conditioner according to claim 12, wherein the peripheral wall is formed so that the first maximum portion and the second maximum portion bulge toward the case suction port. A refrigeration cycle apparatus comprising the centrifugal blower according to any one of claims 1 to 8.

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