JP6662761B2 - Centrifugal blower - Google Patents

Description

  The present invention relates to a centrifugal blower for a two-layer flow type vehicle air conditioner.

  In the field of vehicle air conditioners, a two-layer flow type vehicle air conditioner is known. An air conditioner of this type includes two air passages separated from each other, that is, a first air passage and a second air passage, and a single centrifugal blower that flows air through these two air passages. The centrifugal blower has a scroll housing and an air intake housing for taking in air sent to the scroll housing.

  The centrifugal blower has a separation cylinder inserted in a space inside a suction port of a scroll housing and a radially inner side of a blade row of an impeller (for example, see Patent Documents 1 and 2). The space between the radially outer side of the blade row of the impeller and the scroll housing is vertically divided by a separating wall, whereby the second air passage communicating with the first air passage and the second air passage communicating with the first air passage. An air passage is formed. The separation cylinder flows into the first air flow path after the first airflow flowing through the first passage outside the separation cylinder is introduced into the upper half of the cascade, and flows through the second passage inside the separation cylinder. The second air flow is provided to flow into the second air flow path after being introduced into the lower half of the cascade. The air intake housing has an outside air introduction port for taking in air (outside air) outside the vehicle compartment, and an inside air introduction port for taking in air (inside air) inside the vehicle compartment. In the centrifugal blower of Patent Literature 2, a filter is provided between a region where the outside air inlet and the inside air inlet are provided and an inlet-side end of the separation cylinder.

  The operation modes of the air conditioner of the above type include an outside air mode in which only the outside air is taken into the air intake housing and the scroll housing, an inside air mode in which only the inside air is taken in, and an inside / outside air two-layer in which both the inside air and the outside air are taken. There is a flow mode.

  In the inside / outside air two-layer flow mode, the inside air introduced into the air intake housing from the inside air introduction port is introduced into the separation cylinder after passing through the filter, and flows out into the second air flow passage through the inside of the scroll housing. On the other hand, the outside air introduced into the air intake housing from the outside air inlet passes through the filter, passes through the outside of the separation tube, flows into the scroll housing, and flows out into the first passage. At this time, if the relationship between the flow path resistances of the inside air passage path and the outside air passage path is not optimized, a sufficient amount of air blown into at least one of the inside air and the outside air may not be obtained. . Also, in the outside air mode and the inside air mode, the air volume distribution to the air outlet may be inappropriate.

JP-A-2004-132342 International Publication WO2015 / 082436 pamphlet

  An object of the present invention is to provide a configuration capable of achieving a sufficient blown air flow rate by optimizing the relationship between the flow path resistances of the inside air passage path and the outside air passage path.

  According to one embodiment of the present invention, there is provided a single-suction centrifugal blower for a vehicle, which has a motor and a plurality of blades forming a circumferential cascade, and is driven to rotate around a rotation axis by the motor. An impeller that blows air sucked into a radially inner space of the cascade from one end in the axial direction toward the outside in the radial direction, an internal space accommodating the impeller, and a suction opening at one end in the axial direction. A scroll housing having a mouth and a discharge port that opens in the circumferential direction; a region of the internal space of the scroll housing between the inner peripheral surface of the scroll housing and the outer peripheral surface of the impeller; and an internal space of the discharge port And a partition extending in the axial direction through a partition wall that divides the air flow in the axial direction to form the first air flow path and the second air flow path, and radially inside the suction port and radially inside the blade row of the impeller. It is a cylinder and sucrose from the suction port The first air flow is provided to divide the flow of air sucked into the housing into a first air flow passing outside the separation cylinder and a second air flow passing inside the separation cylinder. Having an outlet end that turns outward in the direction and guides it to the first air flow path and turns the second air flow outward in the radial direction and guides it to the second air flow path; And at least one outside air introduction port for taking in outside air of the vehicle, and at least one inside air introduction port for taking in inside air of the vehicle, and the outside air taken in from the outside air introduction port flows outside the separation cylinder. And an air intake housing configured to allow the inside air taken in from the inside air introduction port to flow inside the separation cylinder. The centrifugal blower optionally contains a filter in the air intake housing between the inside air inlet and the outside air inlet and the inlet end of the separation tube at a position close to the inlet end. And a filter accommodating portion that performs the operation.

In a preferred embodiment, the centrifugal blower has at least one of the following features (1) to (6).
(1) In the filter housing when the two-layer flow mode in which outside air is introduced into the air intake housing from at least one outside air introduction port and inside air is introduced from at least one inside air introduction port is executed. The ratio of the cross-sectional area of the outside air passage area measured at the position of the downstream side surface of the accommodated filter to the cross-sectional area of the inside air passage area is equal to the cross-sectional area of the first air flow path measured at the position of the discharge port of the scroll housing. It is almost the same as the ratio to the cross-sectional area of the two air passages.
(2) In the filter housing when the two-layer flow mode in which outside air is introduced into the air intake housing from at least one outside air introduction port and inside air is introduced from at least one inside air introduction port is executed. The cross-sectional areas of the outside air passage area and the inside air passage area measured at the position of the downstream side surface of the accommodated filter are E1 and R1, respectively, and the first air flow path and the second air measured at the position of the discharge port of the scroll housing. When the cross-sectional areas of the flow paths are E3 and R3, one of the relations of “E1> R1” and “E3> R3” or “E1 <R1” and “E3 <R3” is established. .
(3) The ratio of the cross-sectional area of the suction port outside the separation cylinder measured at the position of the suction port of the scroll housing to the cross-sectional area inside the separation cylinder is the first air measured at the position of the discharge port of the scroll housing. The ratio of the cross-sectional area of the flow path to the cross-sectional area of the second air flow path is substantially the same.
(4) The cross-sectional area of the suction port outside the separation cylinder measured at the position of the suction port of the scroll housing is E2, the cross-sectional area inside the separation cylinder is R2, and the cross-sectional area is measured at the position of the discharge port of the scroll housing. When the sectional areas of the first air flow path and the second air flow path are E3 and R3, respectively, any one of “E2> R2” and “E3> R3” or “E2 <R2” and “E3 <R3” The relationship is established.
(5) In the filter accommodating portion when the two-layer flow mode in which outside air is introduced into the air intake housing from at least one outside air introduction port and inside air is introduced from at least one inside air introduction port is executed. The ratio of the cross-sectional area of the outside air passage area and the cross-sectional area of the inside air passage area measured at the position of the downstream side surface of the accommodated filter is the cross-sectional area of the outside suction port of the separation cylinder measured at the position of the suction port of the scroll housing. It is almost the same as the ratio to the cross-sectional area inside the separation cylinder.
(6) Inside the air intake housing, the outside air is introduced from at least one outside air inlet, and at the same time, the filter accommodating portion when the two-layer flow mode in which the inside air is introduced from at least one inside air inlet is executed. The cross-sectional areas of the outside air passage area and the inside air passage area measured at the position of the downstream side surface of the accommodated filter are E1 and R1, respectively, and the cutoff of the outside suction port of the separation cylinder measured at the position of the suction port of the scroll housing. When the area is E2 and the cross-sectional area inside the separation tube is R2, one of the relations “E1> R1” and “E2> R2” or “E1 <R1” and “E2 <R2” is established. are doing.

  According to the above embodiment, since the relationship between the flow path resistances of the inside air passage path and the outside air passage path is optimized, it is easy to maintain the flow ratio of the inside air to the outside air at a desired value, and the blower It is easy to obtain a sufficient amount of blown air from the air.

It is a longitudinal section containing the meridional section of the centrifugal blower concerning one embodiment of the present invention. It is a schematic sectional drawing which shows the state in which only outside air is taken in into the air intake housing of a centrifugal blower. It is a schematic sectional drawing which shows the state in which only inside air is taken in into the air intake housing of a centrifugal blower. FIG. 3 is a sectional view taken along the line IIIA-IIIA of FIG. 1. FIG. 3 is a sectional view taken along the line IIIB-IIIB in FIG. 1. FIG. 3C is a cross-sectional view along the line IIIC-IIIC in FIG. 3B.

  Hereinafter, an embodiment of a centrifugal blower for vehicles of the present invention will be described with reference to the accompanying drawings. In each of the drawings, R indicates the right side of the vehicle, L indicates the left side of the vehicle, Fr indicates the front of the vehicle, and Rr indicates the rear of the vehicle. However, the installation direction of the centrifugal blower with respect to the vehicle is not limited to the illustrated example.

  The centrifugal blower 1 shown in FIG. 1 is a single suction type centrifugal blower. The centrifugal blower 1 has an impeller 2. The impeller 2 has a plurality of blades 3 on its outer peripheral portion, forming blade rows 3A arranged in the circumferential direction. The impeller 2 is driven to rotate around the rotation axis Ax by the motor 13, and directs the air sucked into the radially inner space of the blade row of the impeller 2 from the axial upper side (one axial end side) to the radial outer side. Blow out.

  In this specification, for convenience of description, the direction of the rotation axis Ax is referred to as the axial direction or the vertical direction, and the upper and lower sides in FIGS. 1 and 2 are referred to as “axial upper side” and “axial lower side”, respectively. Call. However, this does not limit the direction of the rotation axis Ax to the vertical direction when the air conditioner is actually installed in the vehicle. Further, in the present specification, unless otherwise specified, the direction of the radius of a circle drawn on a plane orthogonal to the rotation axis Ax about an arbitrary point on the rotation axis Ax is referred to as a radial direction, and The circumferential direction of the circle is called the circumferential direction or the circumferential direction.

  The impeller 2 includes an inner deflecting member 9 integrally formed with the impeller 2. The inner deflecting member 9 is sometimes called a cone. The inner deflecting member 9 is a rotating body in a geometric sense, and has a side peripheral portion 10 and a central portion 11. In the central portion 11, the rotating shaft 12 of the motor 13 is connected to the impeller 2. In this example, the side peripheral portion 10 is curved such that the contour line in the meridional section of the outer peripheral surface of the side peripheral portion 10 becomes steeper as it approaches the central portion 11. In another example (not shown), the side peripheral portion 10 has a configuration in which the contour line in the meridional section of the outer peripheral surface of the side peripheral portion 10 is not curved from the central portion 11 toward the blade row 3A (the cross section is straight). There is also.

  The impeller 2 is housed in a substantially cylindrical internal space of the scroll housing 17. The scroll housing 17 has a suction port 22 that opens upward in the axial direction, and a discharge port 170 (see FIGS. 3A and 3B). As shown in FIGS. 3A and 3B, when the scroll housing 17 is viewed from the axial direction, the discharge port 170 extends substantially in a tangential direction on the outer peripheral surface of the scroll housing 17. The outlet 170 is not visible in FIG.

  The scroll housing 17 has a partition wall 20 extending radially inward from an outer peripheral wall 17A of the scroll housing 17. The partition wall 20 divides a region between the inner peripheral surface of the scroll housing 17 and the outer peripheral surface of the impeller 2 in the internal space of the scroll housing 17 in the axial direction (up and down), and An upper first air flow path 18 and a lower second air flow path 19 extending in the circumferential direction along the outer peripheral wall 17A are formed.

  The separation cylinder 14 is inserted into the scroll housing 17 via the suction port 22. The lower portion 16 of the separation tube 14 extends axially from the central portion 15 through the suction port 22 to the space 4 inside the blade row 3A of the impeller 2 in the radial direction. The upper portion 24 of the separation cylinder 14 is located outside the scroll housing 17 (axially above the suction port 22). The lower end of the separation cylinder 14 is located in the space 4 inside the blade row 3A of the impeller 2 in the radial direction.

  As apparent from FIG. 3A, a cross section of the upper portion 24 of the separation cylinder 14 (meaning a cross section in a direction perpendicular to the rotation axis Ax) is substantially rectangular. The cross section of the central portion 15 of the separation cylinder 14 is circular (or substantially circular). The cross-sectional shape of the separation cylinder 14 smoothly changes from a rectangular shape to a circular shape as it approaches the central portion 15 from the upper portion 24. The space between the center and the upper part of the separation tube 14 is curved, and the position of the center of the cross section of the separation tube 14 changes smoothly from the upper part 24 to the center 15. The lower part 16 (exit end) of the separation tube 14 has a flare shape whose diameter increases as approaching the lower end, and the lower end is circular.

  It is impossible, or even possible, to integrally mold the separation cylinder 14 having the illustrated shape by the resin injection molding technique. Therefore, it is preferable to manufacture the separation tube 14 by connecting two or more separately injection-molded pieces by a method such as bonding or fitting.

  The separation cylinder 14 converts the flow of air sucked into the scroll housing 17 into a first airflow passing through a first passage 14A outside the separation cylinder 14 and a second airflow passing through a second passage 14B inside the separation cylinder 14. Split into airflow. The first air flow passes through a ring-shaped region of the suction port 22 of the scroll housing 17 outside the outer peripheral surface of the separation cylinder 14, and the upper half portion 5 of the blade row of the impeller 2 (a portion close to the suction port 22). Flows into. The second airflow enters the inside of the separation tube 14 from the upper end of the separation tube 14 and flows into the lower half 6 of the blade row of the impeller 2 (a portion far from the suction port 22). Therefore, the ring-shaped region of the suction port 22 of the scroll housing 17 outside the outer peripheral surface of the separation cylinder 14 is the first suction port of the scroll housing 17, and the upper opening of the separation cylinder 14 is the second suction port of the scroll housing 17. , Can also be considered.

  An air intake housing 21 is connected to the scroll housing 17. The scroll housing 17 and the air intake housing 21 may be integrally formed, or may be separately manufactured and then connected by a method such as screwing, bonding, or fitting. The scroll housing 17 and the air intake housing 21 form part of an air conditioner casing.

  The air intake housing 21 has a first opening (outside air introduction port) 25, a second opening (inside air introduction port) 26, and a third opening (inside air introduction port) 27. The first opening 25 is connected to an outlet (not shown) of an outside air introduction passage provided in the vehicle or is near the outlet, and is connected to the outside air (air taken from outside the vehicle) through the first opening 25. ) Can be introduced into the air intake housing 21. The second opening 26 and the third opening 27 are connected to an entrance (not shown) of the inside air introduction passage provided in the vehicle or are near the exit, and the second and / or third openings 26 and 27 are provided. The inside air (vehicle interior air) can be introduced into the air intake housing 21 through the air intake housing 21.

  In an exemplary, non-limiting embodiment, each of the first opening 25, the second opening 26, and the third opening 27 may be a rectangular hole extending in a lateral direction (LR direction) of the vehicle. . The second opening 26 and the third opening 27 are two openings divided by a partition member (not shown). However, the present invention is not limited to this. It can serve as the second opening 26 and the third opening 27.

  A first switching door 33 and a second switching door 34 of a type called a rotary door are provided in the air intake housing 21. The first switching door 33 has a rotating shaft 33a rotated by an actuator (not shown) and a closing body 33b connected to the rotating shaft 33a. The closing body 33b can turn with the rotation of the rotation shaft 33a to close the first opening 25 or the second opening 26. The second switching door 34 has a rotating shaft 34a rotated by an actuator (not shown), and a closing body 34b connected to the rotating shaft 34a. The closing body 34b can turn with the rotation of the rotation shaft 34a to close the third opening 27.

  The first switching door 33 closes the first opening 25 and opens the second opening 26 (FIG. 2B), and the second position opens the first opening 25 and closes the second opening 26 (FIG. 2B). 2A). The second switching door 34 can move between a first position (FIG. 2A) closing the third opening 27 and a second position (FIG. 2B) opening the third opening 27.

  In the air intake housing 21, between the first to third openings 25 to 27 and an inlet opening (corresponding to the opening area 240 shown in FIG. 3A) provided at the upper end of the upper part 24 of the separation tube 14. A filter 35 is provided for removing contaminants such as dust and particles contained in the air and unpleasant odors. The filter 35 is provided on the inlet opening side of the separation cylinder 14 with respect to the operating range of the first switching door 33 and the second switching door 34. The filter 35 is formed by, for example, folding a nonwoven fabric having a predetermined air permeability into a pleated shape. Odor removing substances such as activated carbon may be attached to remove off-flavors.

  Further, the filter 35 is inserted into a slot or a rail (only a part of which is schematically shown in FIG. 1) as a filter accommodating portion 36 provided in the air intake housing 21, and It is held at a position close to the upper part 24, that is, the entrance end. The shape and size of the filter 35 are substantially the same as the shape and size of the air intake housing 21 (see FIG. 3A) in the cross section taken along the line IIIA-IIIA of FIG. In the illustrated example, the filter 35 is quadrangular (usually rectangular or square).

  Next, the operation of the vehicle air conditioner shown in FIGS. 1 to 3 will be described.

  In the first operation mode of the vehicle air conditioner, as shown in FIG. 2A, the first switching door 33 is set to the second position, the first opening 25 is opened, and the second opening 26 is closed. Further, the second switching door 34 is set to the first position, and the third opening 27 is closed. In this case, the outside air AE introduced into the air intake housing 21 from the first opening 25 passes through the first region 35A of the filter 35, passes through the first passage 14A outside the separation cylinder 14, and the blades of the impeller 2 The first airflow flowing into the upper half 5 of the row 3A passes through the second area 35B of the filter 35, passes through the second passage 14B inside the separation tube 14, and the lower half 6 of the blade row of the impeller 2 To form a second airflow flowing into the airflow. The first operation mode is sometimes called an outside air mode.

  In the second operation mode, as shown in FIG. 1, the first switching door 33 is in the second position, the first opening 25 is opened, and the second opening 26 is closed. Further, the second switching door 34 is set to the second position, and the third opening 27 is opened. In this case, the outside air AE introduced into the air intake housing 21 from the first opening 25 passes through the first region 35A of the filter 35, passes through the first passage 14A outside the separation tube 14, and passes through the blades of the impeller 2. A first airflow entering the upper half 5 of the row 3A is formed. The inside air AR introduced from the third opening 27 passes through the second region 35B of the filter 35, passes through the second passage 14B inside the separation tube 14, and enters the lower half 6 of the blade row 3A of the impeller 2. Form an incoming second airflow. As is clear from FIG. 1, the closing body 34 b of the second switching door 34 at the second position divides the space above the filter 35 into a space on the first opening 25 side and a space on the third opening 27 side. And the outside air AE and the inside air AR are prevented from being mixed above the filter 35. That is, the closing body 34b of the second switching door 34 at the second position has a function of a separation wall that separates the outside air AE from the inside air AR above the filter 35 in the second operation mode. The second mode of operation is sometimes referred to as an inside / outside air two-layer flow mode.

  In the third operation mode, as shown in FIG. 2B, the first switching door 33 is set to the first position, the first opening 25 is closed, and the second opening 26 is opened. Further, the second switching door 34 is set to the second position, and the third opening 27 is opened. In this case, the inside air AR introduced into the air intake housing 21 from the second opening 26 and the third opening 27 passes through the first region 35A of the filter 35, and passes through the first passage 14A outside the separation cylinder 14. The first airflow flowing into the upper half 5 of the cascade 3A of the impeller 2 passes through the second region 35B of the filter 35, passes through the second passage 14B inside the separation cylinder 14, and is cascaded by the impeller 2. To form a second airflow flowing into the lower half 6. The third mode of operation is sometimes referred to as the shy mode

  The second operation mode (inside / outside air two-layer flow mode) is a heating operation in which the vehicle interior is quickly warmed while the interior of the vehicle is cold, while preventing the fogging of the front window, particularly in winter or when the temperature is relatively low. It is used when performing. Alternatively, the third operation mode (inside air mode) is set at an early stage of the heating operation, and when the temperature in the passenger compartment starts to increase, the operation mode is promptly shifted to the second operation mode. When the heating operation is performed by automatic control, outside air AE is blown from a defroster outlet (not shown) in the vehicle compartment to a front window (not shown), and inside air AR is supplied to a foot outlet (not shown) in the vehicle compartment. ) Is blown out toward the passenger's feet.

  Next, a configuration for achieving a sufficient amount of blown air by optimizing the relationship between the flow path resistances of the inside air passage path and the outside air passage path will be described. In the following description, a case will be described as an example where the vehicle air conditioner is operating in the second operation mode (inside / outside air two-layer flow mode).

  FIG. 3A shows a cross section taken along the line IIIA-IIIA of FIG. 1, which is located at substantially the same axial position (actually, slightly below) as the downstream side surface (outflow side surface) of the filter 35. 3 is a cross section of the air intake housing 21. Note that the axial position is a position in the direction of the rotation axis Ax as described above.

  The cross section shown in FIG. 3A includes the upper end of the upper portion 24 of the separation tube 14. The upper end of the separation tube 14 has an inlet opening 240 of the separation tube 14. The entrance opening 240 is surrounded by peripheral portions 241, 242, 243, and 244 corresponding to four sides of the rectangle, respectively. The inlet opening 240 is not located at the center of the air intake housing 21 in the front-rear direction (Fr-Rr direction) but at the rear side. The peripheral portions 241, 243, 244 of the inlet opening 240 are connected to the walls 211, 213, 214 of the air intake housing 21.

  When the impeller 2 rotates, the air present near the inlet opening 240 is sucked into the inlet opening 240 of the separation cylinder 14. Therefore, the air is sucked into the separation cylinder 14 through the portion of the filter 35 above the inlet opening 240 (the second region 35B of the filter 35). When the two-layer flow mode is executed, as shown in FIG. 1, since the edge 34 e of the closing body 34 b of the second switching door 34 is located almost directly above the peripheral portion 242 of the separation cylinder 14, Almost only inside air passes through the second area 35B. On the other hand, almost only outside air passes through the first area 35A (area other than the second area 35B) of the filter 35.

  Assuming that the area of the inlet opening 240 of the separation cylinder 14 is “R1”, the area of the second region 35B of the filter 35 can be regarded as R1. Therefore, it can be said that R1 corresponds to the cross-sectional area of the inside air passage area (that is, the second area 35B) measured at the position of the downstream side surface of the filter 35 housed in the filter housing part 36 when the two-layer flow mode is executed. . Further, in the cross section of the air intake housing 21 appearing in FIG. 3A, the area of the portion excluding the separation cylinder 14 (that is, the area on the left side of the wall body 242 in FIG. 3A) is assumed to be “E1”. Can be said to correspond to the cross-sectional area of the outside air passage area (that is, the first area 35A) measured at the position of the downstream side surface of the filter 35 housed in the filter housing part 36 when the two-layer flow mode is executed.

  FIG. 3B shows a cross section taken along the line IIIB-IIIB of FIG. 1. This cross section shows the position of the suction port 22 (also called a bell mouth or the like) of the scroll housing 17 in the axial direction, specifically, the area of the suction port 22 is the smallest. 3 is a cross-sectional view of the scroll housing 17 and the separation cylinder 14 at an axial position.

  In the cross section shown in FIG. 3B, the cross-sectional area inside the separation cylinder 14 measured at the position of the suction port 22 of the scroll housing 17, that is, the area of the region surrounded by the inner peripheral surface of the separation cylinder 14 is “R2”. And Further, the cross-sectional area of the suction port 22 outside the separation tube 14, that is, the outer circumferential surface of the separation tube 14 and the inner circumferential surface 22 e of the suction port 22 (in the illustrated example, the contour of the edge of the suction port 22) is sandwiched. The area of the region is set to “E2”.

  FIG. 3C shows a cross section taken along the line IIIC-IIIC of FIG. 3B. This cross section is the cross section of the discharge port 170 of the scroll housing 17, specifically, the cross section of the downstream side of the tongue 17t of the housing 17 having the largest cross sectional area. It is a cross section of the discharge port 170 at a small position. The portion having the smallest cross-sectional area on the downstream side of the tongue portion 17t often exists very near the tongue portion 17t (for example, between the tongue portion 17t and the downstream side of 30 mm).

  In the cross section shown in FIG. 3C, the cross-sectional area of the first air flow path 18 (that is, the cross-sectional area of the first air flow path 18 measured at the position of the discharge port 170 of the scroll housing 17) is “E3”, The cross-sectional area of the air flow path 19 (that is, the cross-sectional area of the second air flow path 19 measured at the position of the discharge port 170 of the scroll housing 17) is defined as “R3”.

For E1, R1, E2, R2, E3, and R3 defined as described above, it is preferable that at least one of the following relationships 1 to 3 hold, and that a plurality of relationships hold Is more preferred.
E1: R1 ≒ E3: R3 ... Relation 1
E2: R2 ≒ E3: R3 ... Relation 2
E1: R1 ≒ E2: R2 ... Relation 3
Note that “≒” means “substantially the same”. Specifically, the values on both sides are exactly the same, or [(larger value−smaller value) / larger value. ] Is 0.05 (5%) or less.

  The ratio of the cross-sectional area (E3: R3) of the first air flow path 18 and the second air flow path 19 is a desired ratio of the air flow rate flowing through the first air flow path 18 and the air flow rate flowing through the second air flow path 19. It is set according to.

  Immediately upstream of the portion having the cross-sectional area E1 and the portion having the cross-sectional area R1 (that is, the downstream side surface of the filter 35), there is a filter 35 serving as a ventilation resistance. It is larger than the upstream part and the downstream part. In addition, since the cross-sectional area E2 and the cross-sectional area R2 have a smaller flow passage area than the respective upstream and downstream portions, they are also compared with the respective upstream and downstream portions. Therefore, the flow path resistance is increased. Therefore, when the two-layer flow mode is executed, the flow rate of the outside air flowing through the passage path of the outside air is greatly affected by the cross-sectional areas E1 and E2, and the flow rate of the inside air flowing through the passage path of the inside air is determined by the cross-sectional areas R1 and R1. It is greatly affected by the cross-sectional area R2.

  The flow path resistance of the passage path of the outside air up to the cross-sectional area E3 (the path passing through the filter 35 and the cross-sectional area E2 corresponding to the cross-sectional area E1) and the cross-sectional area R3 And the flow path resistance of the passage path of the inside air (the path passing through the portion of the filter 35 and the portion of the cross-sectional area R2 corresponding to the portion of the cross-sectional area R1) is the ratio E3: R3 between the cross-sectional area E3 and the cross-sectional area R3 If it is greatly different from the above, it is difficult to achieve a desired flow ratio between the first air flow path 18 and the second air flow path. Further, when the sectional area E1 is larger than the sectional area R1 and the sectional area E2 is smaller than the sectional area R2 (or the sectional area E1 is smaller than the sectional area R1 and the sectional area E2 is larger than the sectional area R2). In this case, both the flow rate of the outside air flowing through the passage path of the outside air and the flow rate of the inside air flowing through the passage path of the inside air become small, and the performance of the blower decreases.

  On the other hand, if at least one, and preferably two, of the above relationships 1 to 3 hold, the flow ratio of the inside air to the outside air can be maintained in a desired range, and the flow rate of the inside air and the outside air can be maintained. Can be sufficiently increased.

It is preferable that at least one of the following relationships 1 ′ to 3 ′ is established instead of the above relationships 1 to 3, and it is more preferable that a plurality of relationships is established.
"E1>R1" and "E3>R3", or "E1 <R1" and "E3 <R3" ... relation 1 '
"E2>R2" and "E3>R3", or "E2 <R2" and "E3 <R3" ... relation 2 '
"E1>R1" and "E2>R2", or "E1 <R1" and "E2 <R2" ... Relation 3 '

  As described above, the relations 1 to 3 are described above by aligning at least two of the magnitude relation between E1 and R1, the magnitude relation between E2 and R2, and the magnitude relation between E3 and R3. For the same reason as above, the desired flow ratio between the first air flow path 18 and the second air flow path can be approximated, and the flow rate of outside air flowing through the passage path of outside air and the flow rate of inside air flowing through the passage path of inside air can be improved. It is possible to prevent the flow rate from decreasing.

In the above-described embodiment, six areas (cross-sectional areas) E1, R1, E2, R2, E3, and R3 have been described. However, the opening area of the first opening 25 and the third area when the two-layer flow mode is executed are described. The relationship with the opening area of the opening 27 may be considered. When the opening area of the first opening 25 is E0 and the opening area of the third opening 27 is R0,
E0: R0 ≒ E1: R1 ... Relation 4
E0: R0 ≒ E2: R3 ... Relation 5
E0: R0 ≒ E3: R3 ... Relationship 6
It is preferable that at least one of the above is satisfied. When the airflow resistance in the first opening 25, the second opening 26, and the third opening 27 is larger than that of the filter 35, it is possible to approach a desired flow ratio between the first air flow path 18 and the second air flow path, Further, it is possible to effectively prevent the flow rate of the outside air flowing through the passage path of the outside air and the flow rate of the inside air flowing through the passage path of the inside air from decreasing.

Similarly,
“E0> R0” and “E1> R1” or “E0 <R0” and “E1 <R1”... Relation 4 ′
"E0>R0" and "E2>R2", or "E0 <R0" and "E2 <R2" ... Relation 5 '
"E0>R0" and "E3>R3", or "E0 <R0" and "E3 <R3" ... relation 6 '
Is preferably established, and more preferably, a plurality of relationships are established.

DESCRIPTION OF SYMBOLS 1 Centrifugal blower 2 Impeller Ax Rotation axis 3 Blade 3A Circumferential cascade 13 Motor 14 Separation cylinder 16 Exit side end (lower part)
Reference Signs List 17 Scroll housing 170 Discharge port 18 First air flow path 19 Second air flow path 20 Partition wall 21 Air intake housing 22 Suction port (of scroll housing) 24 Inlet end (top)
240 opening area (entrance opening)
25 Outside air inlet (opening)
26, 27 Inside air inlet (opening)
35 Filter 35A First Area 35B Second Area 36 Filter Housing E1, R1, E2, R2, E3, R3 Area, Cross-sectional Area

Claims (6)

A single-suction centrifugal blower (1) for a vehicle,
A motor (13);
It has a plurality of blades (3) forming a circumferential cascade (3A), and is rotationally driven around a rotation axis (Ax) by the motor, and is arranged in a radial direction of the cascade (3A) from one axial end. An impeller (2) for blowing air taken into the inner space radially outward,
A scroll housing (17) having an internal space accommodating the impeller, a suction port (22) opening at one end in the axial direction, and a discharge port (170) opening in the circumferential direction;
A region between the inner peripheral surface of the scroll housing (17) and the outer peripheral surface of the impeller (2) in the internal space of the scroll housing (17) and the internal space of the discharge port (170) are A partition wall (20) divided in the axial direction to form a first air flow path (18) and a second air flow path (19);
A separation cylinder (14) extending in the axial direction through a radially inner side of the suction port and a radially inner side of the cascade of the impeller (2), wherein the separation cylinder (14) extends from the suction port (22) to the scroll housing ( 17) is provided so as to divide the flow of air sucked into the first air flow passing outside the separation cylinder and the second air flow passing inside the separation cylinder, and The flow is turned radially outward and is guided to the first air flow path (18), and the second air flow is turned radially outward and is guided to the second air flow path (19). A separation tube (14) having an outlet end (16);
At least one outside air inlet (25) for taking in outside air of the vehicle, and at least one inside air inlet (26, 27) for taking in inside air of the vehicle, and the outside air taken in from the outside air introduction port is provided. An air intake housing (21) configured to allow the air to flow outside the separation tube (14) and to flow the inside air taken in from the inside air introduction port (27) to the inside of the separation tube (14). ,
At a position close to the inlet side end (24) between the inside air inlet and the outside air inlet and the inlet side end (24) of the separation tube (14), the air intake housing ( 21) a filter accommodating portion (36) for accommodating a filter (35) therein;
With
The filter (35) is provided on an entire air inflow path in the filter accommodating portion (36) in the air intake housing (21), and the at least one outside air is introduced into the air intake housing (21). Outside air is introduced from the port (25) and housed in the filter housing part (36) when the two-layer flow mode in which the inside air is introduced from the at least one inside air inlet (26, 27) is executed. The ratio of the cross-sectional area (E1) of the outside air passage area to the cross-sectional area (R1) of the inside air passage area measured at the position of the downstream side surface of the filter (35) is equal to the discharge port (170) of the scroll housing (17). ), The ratio of the cross-sectional area (E3) of the first air flow path (18) to the cross-sectional area (R3) of the second air flow path (19) measured at the position (1). A single-suction centrifugal blower (1) for a vehicle,
A motor (13);
It has a plurality of blades (3) forming a circumferential cascade (3A), and is rotationally driven around a rotation axis (Ax) by the motor, and is arranged in a radial direction of the cascade (3A) from one axial end. An impeller (2) for blowing air taken into the inner space radially outward,
A scroll housing (17) having an internal space accommodating the impeller, a suction port (22) opening at one end in the axial direction, and a discharge port (170) opening in the circumferential direction;
A region between the inner peripheral surface of the scroll housing (17) and the outer peripheral surface of the impeller (2) in the internal space of the scroll housing (17) and the internal space of the discharge port (170) are A partition wall (20) divided in the axial direction to form a first air flow path (18) and a second air flow path (19);
A separation cylinder (14) extending in the axial direction through a radially inner side of the suction port and a radially inner side of the cascade of the impeller (2), wherein the separation cylinder (14) extends from the suction port (22) to the scroll housing ( 17) is provided so as to divide the flow of air sucked into the first air flow passing outside the separation cylinder and the second air flow passing inside the separation cylinder, and The flow is turned radially outward and is guided to the first air flow path (18), and the second air flow is turned radially outward and is guided to the second air flow path (19). A separation tube (14) having an outlet end (16);
At least one outside air inlet (25) for taking in outside air of the vehicle, and at least one inside air inlet (26, 27) for taking in inside air of the vehicle, and the outside air taken in from the outside air introduction port is provided. An air intake housing (21) configured to allow the air to flow outside the separation tube (14) and to flow the inside air taken in from the inside air introduction port (27) to the inside of the separation tube (14). ,
At a position close to the inlet side end (24) between the inside air inlet and the outside air inlet and the inlet side end (24) of the separation tube (14), the air intake housing ( 21) a filter accommodating portion (36) for accommodating a filter (35) therein;
With
The filter (35) is provided on an entire air inflow path in the filter accommodating portion (36) in the air intake housing (21), and the at least one outside air is introduced into the air intake housing (21). Outside air is introduced from the port (25) and housed in the filter housing part (36) when the two-layer flow mode in which the inside air is introduced from the at least one inside air inlet (26, 27) is executed. The cross-sectional areas of the outside air passage area and the inside air passage area measured at the position of the downstream side surface of the filter (35) are E1 and R1, respectively, and are measured at the position of the discharge port (170) of the scroll housing (17). When the cross-sectional areas of the first air flow path (18) and the second air flow path (19) are E3 and R3, respectively, "E1>R1" and "E3>R"", Or any of the relationship of" E1 <R1 "and" E3 <R3 "is established, the centrifugal blower. A single-suction centrifugal blower (1) for a vehicle,
A motor (13);
It has a plurality of blades (3) forming a circumferential cascade (3A), and is rotationally driven around a rotation axis (Ax) by the motor, and is arranged in a radial direction of the cascade (3A) from one axial end. An impeller (2) for blowing air taken into the inner space radially outward,
A scroll housing (17) having an internal space accommodating the impeller, a suction port (22) opening at one end in the axial direction, and a discharge port (170) opening in the circumferential direction;
A region between the inner peripheral surface of the scroll housing (17) and the outer peripheral surface of the impeller (2) in the internal space of the scroll housing (17) and the internal space of the discharge port (170) are A partition wall (20) divided in the axial direction to form a first air flow path (18) and a second air flow path (19);
A separation cylinder (14) extending in the axial direction through a radially inner side of the suction port and a radially inner side of the cascade of the impeller (2), wherein the separation cylinder (14) extends from the suction port (22) to the scroll housing ( 17) is provided so as to divide the flow of air sucked into the first air flow passing outside the separation cylinder and the second air flow passing inside the separation cylinder, and The flow is turned radially outward and is guided to the first air flow path (18), and the second air flow is turned radially outward and is guided to the second air flow path (19). A separation tube (14) having an outlet end (16);
At least one outside air inlet (25) for taking in outside air of the vehicle, and at least one inside air inlet (26, 27) for taking in inside air of the vehicle, and the outside air taken in from the outside air introduction port is provided. An air intake housing (21) configured to allow the air to flow outside the separation tube (14) and to flow the inside air taken in from the inside air introduction port (27) to the inside of the separation tube (14). ,
With
The cross-sectional area (E2) of the suction port (22) outside the separation tube (14) measured at the position of the suction port (22) of the scroll housing (17), and the inside of the separation tube (14). The ratio of the sectional area (R2) to the sectional area (E3) of the first air flow path (18) measured at the position of the discharge port (170) of the scroll housing (17) and the second air flow path A centrifugal blower having substantially the same ratio as the cross-sectional area (R3) of (19). A single-suction centrifugal blower (1) for a vehicle,
A motor (13);
It has a plurality of blades (3) forming a circumferential cascade (3A), and is rotationally driven around a rotation axis (Ax) by the motor, and is arranged in a radial direction of the cascade (3A) from one axial end. An impeller (2) for blowing air taken into the inner space radially outward,
A scroll housing (17) having an internal space accommodating the impeller, a suction port (22) opening at one end in the axial direction, and a discharge port (170) opening in the circumferential direction;
A region between the inner peripheral surface of the scroll housing (17) and the outer peripheral surface of the impeller (2) in the internal space of the scroll housing (17) and the internal space of the discharge port (170) are A partition wall (20) divided in the axial direction to form a first air flow path (18) and a second air flow path (19);
A separation cylinder (14) extending in the axial direction through a radially inner side of the suction port and a radially inner side of the cascade of the impeller (2), wherein the separation cylinder (14) extends from the suction port (22) to the scroll housing ( 17) is provided so as to divide the flow of air sucked into the first air flow passing outside the separation cylinder and the second air flow passing inside the separation cylinder, and The flow is turned radially outward and is guided to the first air flow path (18), and the second air flow is turned radially outward and is guided to the second air flow path (19). A separation tube (14) having an outlet end (16);
At least one outside air inlet (25) for taking in outside air of the vehicle, and at least one inside air inlet (26, 27) for taking in inside air of the vehicle, and the outside air taken in from the outside air introduction port is provided. An air intake housing (21) configured to allow the air to flow outside the separation tube (14) and to flow the inside air taken in from the inside air introduction port (27) to the inside of the separation tube (14). ,
With
The cross-sectional area of the suction port (22) outside the separation cylinder (14) measured at the position of the suction port (22) of the scroll housing (17) is E2, and the cross-sectional area inside the separation cylinder (14) is E2. Is R2, and the cross-sectional areas of the first air flow path (18) and the second air flow path (19) measured at the position of the discharge port (170) of the scroll housing (17) are E3 and E3, respectively. A centrifugal blower that satisfies any of the relations “E2> R2” and “E3> R3” or “E2 <R2” and “E3 <R3” when R3 is set. A single-suction centrifugal blower (1) for a vehicle,
A motor (13);
It has a plurality of blades (3) forming a circumferential cascade (3A), and is rotationally driven around a rotation axis (Ax) by the motor, and is arranged in a radial direction of the cascade (3A) from one axial end. An impeller (2) for blowing air taken into the inner space radially outward,
A scroll housing (17) having an internal space accommodating the impeller, a suction port (22) opening at one end in the axial direction, and a discharge port (170) opening in the circumferential direction;
A region between the inner peripheral surface of the scroll housing (17) and the outer peripheral surface of the impeller (2) in the internal space of the scroll housing (17) and the internal space of the discharge port (170) are A partition wall (20) divided in the axial direction to form a first air flow path (18) and a second air flow path (19);
A separation cylinder (14) extending in the axial direction through a radially inner side of the suction port and a radially inner side of the cascade of the impeller (2), wherein the separation cylinder (14) extends from the suction port (22) to the scroll housing ( 17) is provided so as to divide the flow of air sucked into the first air flow passing outside the separation cylinder and the second air flow passing inside the separation cylinder, and The flow is turned radially outward and is guided to the first air flow path (18), and the second air flow is turned radially outward and is guided to the second air flow path (19). A separation tube (14) having an outlet end (16);
The outside air inlet having at least one outside air inlet (25; 25A, 25B) for taking in the outside air of the vehicle and at least one inside air inlet (26, 27) for taking in the inside air of the vehicle; An air intake housing configured to allow outside air taken in from outside to flow outside the separation tube (14) and to allow inside air taken in from the inside air introduction port (27) to flow inside the separation tube (14). (21)
At a position close to the inlet side end (24) between the inside air inlet and the outside air inlet and the inlet side end (24) of the separation tube (14), the air intake housing ( 21) a filter accommodating portion (36) for accommodating a filter (35) therein;
With
The filter (35) is provided on an entire air inflow path in the filter accommodating portion (36) in the air intake housing (21), and the at least one outside air is introduced into the air intake housing (21). Outside air is introduced from the port (25) and housed in the filter housing part (36) when the two-layer flow mode in which the inside air is introduced from the at least one inside air inlet (26, 27) is executed. The ratio of the cross-sectional area (E1) of the outside air passage area to the cross-sectional area (R1) of the inside air passage area measured at the position of the downstream side surface of the filter (35) is equal to the suction port (22) of the scroll housing (17). Is substantially the same as the ratio of the cross-sectional area (E2) of the suction port (22) outside the separation cylinder (14) and the cross-sectional area (R2) inside the separation cylinder (14) measured at the position of Centrifugal feeding Machine. A single-suction centrifugal blower (1) for a vehicle,
A motor (13);
It has a plurality of blades (3) forming a circumferential cascade (3A), and is rotationally driven around a rotation axis (Ax) by the motor, and is arranged in a radial direction of the cascade (3A) from one axial end. An impeller (2) for blowing air taken into the inner space radially outward,
A scroll housing (17) having an internal space accommodating the impeller, a suction port (22) opening at one end in the axial direction, and a discharge port (170) opening in the circumferential direction;
A region between the inner peripheral surface of the scroll housing (17) and the outer peripheral surface of the impeller (2) in the internal space of the scroll housing (17) and the internal space of the discharge port (170) are A partition wall (20) divided in the axial direction to form a first air flow path (18) and a second air flow path (19);
A separation cylinder (14) extending in the axial direction through a radially inner side of the suction port and a radially inner side of the cascade of the impeller (2), wherein the separation cylinder (14) extends from the suction port (22) to the scroll housing ( 17) is provided so as to divide the flow of air sucked into the first air flow passing outside the separation cylinder and the second air flow passing inside the separation cylinder, and The flow is turned radially outward and is guided to the first air flow path (18), and the second air flow is turned radially outward and is guided to the second air flow path (19). A separation tube (14) having an outlet end (16);
At least one outside air inlet (25) for taking in outside air of the vehicle, and at least one inside air inlet (26, 27) for taking in inside air of the vehicle, and the outside air taken in from the outside air introduction port is provided. An air intake housing (21) configured to allow the air to flow outside the separation tube (14) and to flow the inside air taken in from the inside air introduction port (27) to the inside of the separation tube (14). ,
At a position close to the inlet side end (24) between the inside air inlet and the outside air inlet and the inlet side end (24) of the separation tube (14), the air intake housing ( 21) a filter accommodating portion (36) for accommodating a filter (35) therein;
With
The filter (35) is provided on an entire air inflow path in the filter accommodating portion (36) in the air intake housing (21), and the at least one outside air is introduced into the air intake housing (21). Outside air is introduced from the port (25) and housed in the filter housing part (36) when the two-layer flow mode in which the inside air is introduced from the at least one inside air inlet (26, 27) is executed. The cross-sectional areas of the outside air passage area and the inside air passage area measured at the position of the downstream side surface of the filter (35) are E1 and R1, respectively, and are measured at the position of the suction port (22) of the scroll housing (17). When the cross-sectional area of the suction port (22) outside the separated cylinder (14) is E2 and the cross-sectional area inside the separated cylinder (14) is R2, "E1>R1". One "E2>R2", or "E1 <R1" and centrifugal blowers or relationship is satisfied in the "E2 <R2."

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