WO2019188754A1 - Two-layer flow type vehicle air conditioning device having auxiliary inside air introduction port - Google Patents

Abstract

[Problem] In a two-layer flow type vehicle air conditioning device, to improve heating efficiency without adversely affecting window clearness, even if an outside air introduction mode is selected. [Solution] An air conditioning device includes a separate tube (50A, 50B, 50C, 50D) extending through a suction opening (13) of a scroll housing (12). The separate tube includes, in an air intake housing (30A, 30B, 30C, 30D), at least one inflow opening (51A, 51B, 51C, 51D)which allows air to flow into the interior thereof. The air intake housing includes an auxiliary inside air introduction port (38), in addition to one outside air intake port (31A; 31C, 31D; 31F), and at least one inside air intake port (32A, 32B; 32C, 32D; 32F). The auxiliary inside air introduction port is provided in a position in which inside air introduced therefrom into the air intake housing flows into the interior of the separate tube through the inflow opening.

Description

Two-layer flow type air conditioner for vehicles with auxiliary inside air inlet

The present invention relates to a two-layer flow type vehicle air conditioner having an auxiliary inside air inlet.

In the field of vehicle air conditioners, two-layer flow type air conditioners are known (see, for example, Patent Document 1). The two-layer flow type air conditioner includes two air passages that are separated from each other, that is, a first air passage and a second air passage, and a single single-suction centrifugal that causes air to flow separately through these two air passages. Some are equipped with a blower. A separation cylinder is inserted into the scroll housing of the centrifugal blower. The outside air and / or the inside air taken into the air intake housing having the outside air intake and the inside air intake depends on the state of at least one switching door provided in the air intake housing, and the inside and outside of the separation cylinder. Each flowing through and into the scroll housing. The air that has passed through the inside of the separation cylinder is sent out to the first air passage, and the air that has passed through the outside of the separation cylinder is sent out to the second air passage, and then blown out into the vehicle compartment.

In the two-layer flow type air conditioner, the operation mode is set to the two-layer flow mode at the time of heating, particularly at the time of fully automatic heating operation performed from a state in which the passenger compartment is cold. This is because if only the outside air is used for heating, all of the air blown into the passenger compartment is heated, and a lot of energy is required in the air conditioner. This is for efficient heating.

Patent Document 2 discloses a vehicle air conditioner in which a case is provided with an auxiliary inside air introduction port in addition to a normal outside air introduction port and an inside air introduction port. When the outside air introduction mode is selected and cold outside air is introduced from the outside air introduction port to the case, relatively warm inside air is introduced from the auxiliary inside air introduction port, and the outside air and the inside air are mixed. Since this mixed air is heated and supplied to the passenger compartment, even when the outside air temperature is very low, it is possible to shorten the time until the passenger compartment reaches an appropriate temperature. On the other hand, when mixed air containing inside air is supplied to the windshield, there arises a safety problem that the windshield is fogged.

JP 2000-203235 A JP 2000-247129 A

In the two-layer flow type vehicle air conditioner, the present invention can improve the heating efficiency without adversely affecting the window clearness even when the outside air introduction mode is selected. The purpose is to provide an auxiliary inside air introduction port.

According to one embodiment of the present invention, an air conditioner for a vehicle, which has a plurality of wings arranged in the circumferential direction, is driven to rotate by a rotating shaft of a motor, and the plurality of wings are shafts of a rotating shaft. An impeller having a first axial portion close to the motor in the direction and a second axial portion further away from the motor than the first axial portion, an internal space for accommodating the impeller, and an axial direction of the rotary shaft An area between the inner peripheral surface of the scroll housing and the outer peripheral surface of the impeller in the internal space of the scroll housing; And an air intake housing having a partition wall that divides the internal space of the discharge port in the axial direction to form a first air flow channel and a second air flow channel, and an internal space that communicates with the suction port of the scroll housing. Air intake An air intake housing provided with at least one outside air inlet for taking in outside air into the inner space of the ding and at least one inside air inlet for taking in inside air into the inner space of the air intake housing; At least one switching door that opens and closes the intake port and the inside air intake port, and a separation cylinder that extends through the suction port of the scroll housing. The separation cylinder allows air to flow into the separation cylinder. At least one inflow opening in the air intake housing and an outflow opening in the scroll housing for letting out air from the inside of the separation cylinder, and scrolling through the outflow opening of the separation cylinder When the air introduced into the housing is guided to the first air flow path of the scroll housing via the first axial portion of the impeller blades. The air introduced into the scroll housing through the outside of the separation cylinder and through the inside of the suction port is guided to the second air flow path via the second axial portion of the impeller blades. Provided with a separation cylinder, an auxiliary internal air introduction port through which the internal air can be taken into the air intake housing is provided in the wall body of the air intake housing or the switching door. An air-conditioning apparatus is provided in which the introduction port is provided at a position where the inside air introduced into the air intake housing from the auxiliary inside air introduction port flows into the separation cylinder through at least one inflow opening. Is done.

According to the embodiment of the present invention, the inside air introduced into the air intake housing from the auxiliary inside air introduction port is substantially supplied only to the first air flow path, and is not supplied to the second air flow path. For this reason, the internal air introduced from the auxiliary internal air inlet into the air intake housing is substantially supplied to the defroster outlet by appropriately setting the configuration of the air distribution section connected to the first air passage and the second air passage. Can be prevented from being supplied automatically.

It is a longitudinal section containing the meridional section of the centrifugal blower with which the air-conditioning device concerning a 1st embodiment of the present invention was provided. FIG. 2 is a cross-sectional view taken along the line IIA-IIA in FIG. FIG. 2 is a cross-sectional view taken along the line IIB-IIB in FIG. FIG. 2 is a cross-sectional view taken along the line IIC-IIC in FIG. FIG. 2 is a cross-sectional view taken along line IID-IID in FIG. It is a schematic sectional drawing which shows the state by which the air conditioner is drive | operating by the external air mode. It is a schematic sectional drawing which shows the state by which the air conditioner is drive | operating by inside air mode. It is a longitudinal cross-sectional view containing the meridian cross section of the centrifugal blower with which the air conditioner which concerns on 2nd Embodiment of this invention was equipped. It is a longitudinal cross-sectional view containing the meridional section orthogonal to the meridional section of FIG. 4 of the centrifugal blower shown in FIG. FIG. 5 is a cross-sectional view taken along line VI-VI in FIG. 4. It is a perspective view which shows an example of a structure of an inside air inlet and the switching door provided there. It is a schematic sectional drawing which shows the auxiliary | assistant internal air inlet provided in the switching door shown to FIG. 7A, and the valve provided there. It is a longitudinal cross-sectional view containing the meridian cross section of the centrifugal blower with which the air conditioner which concerns on 3rd Embodiment of this invention was equipped. FIG. 9 is a schematic sectional view showing a section along the IX-IX shoreline of the centrifugal blower shown in FIG. 8 together with a heat exchange / air distribution unit. It is a disassembled perspective view which shows the structure of the separation cylinder and switching door of the centrifugal blower shown in FIG. It is a schematic sectional drawing for demonstrating the operation mode of the centrifugal air blower shown in FIG. It is a longitudinal cross-sectional view containing the meridian cross section of the centrifugal blower with which the air conditioner which concerns on 4th Embodiment of this invention was equipped.

Embodiments of an air conditioner for a vehicle according to the present invention, particularly a centrifugal fan, will be described below with reference to the accompanying drawings. In each figure, R is the right side of the vehicle, L is the left side of the vehicle, Fr is the front of the vehicle, Rr is the rear of the vehicle, U is the upper side of the vehicle, and D is the lower side of the vehicle. However, the installation direction of the centrifugal blower with respect to the vehicle is not limited to the illustrated example.

A centrifugal blower 1A shown in FIG. 1 is a single suction centrifugal blower. Centrifugal blower 1 </ b> A has an impeller 14. The impeller 14 has a plurality of blades 140 forming a blade row aligned in the circumferential direction on the outer peripheral portion thereof. The impeller 14 is driven to rotate about the rotation axis Ax by the motor 16, and the air sucked into the space radially inward of the blade row of the impeller 14 from the upper side in the axial direction (one axial end side) is directed outward in the radial direction. And blow out.

In the present specification, for convenience of explanation, the direction of the rotation axis Ax of the motor 16 and the impeller 14 is referred to as “axial direction”. In the following description, the description will be made on the assumption that the axial direction coincides with the vertical direction, but it is noted that the air conditioner may be incorporated in the vehicle so that the axial direction is inclined with respect to the vertical direction. Should. In the present specification, unless otherwise noted, the direction of the radius of a circle drawn on a plane perpendicular to the rotation axis Ax around an arbitrary point on the rotation axis Ax is referred to as a radial direction. The circumferential direction of the circle is called the circumferential direction or the circumferential direction.

The impeller 14 includes an inner deflection member 15 formed integrally with the impeller 14. The inner deflection member 15 may be called a cone portion. The inner deflection member 15 is a rotating body in a geometric sense. At the center of the inner deflection member 15, the rotation shaft 160 of the motor 16 is connected to the impeller 14.

The impeller 14 is accommodated inside the scroll housing 12. The scroll housing 12 has a suction port 13 that opens upward in the axial direction, and a discharge port 120 (see FIG. 2A). As shown in FIG. 2A, when the scroll housing 12 is viewed from the axial direction, the discharge port 120 extends substantially in the tangential direction of the outer peripheral surface of the scroll housing 12. The outlet 120 is not visible in FIG.

The scroll housing 12 has a partition wall 18 that extends radially inward from the outer peripheral wall of the scroll housing 12. The partition wall 18 divides a region between the inner peripheral surface of the scroll housing 12 and the outer peripheral surface of the impeller 14 in the internal space of the scroll housing 12 in the axial direction (up and down). A lower first air flow path 19 and an upper second air flow path 20 extending in the circumferential direction along the outer peripheral wall body are formed.

As is well known to those skilled in the art, on the downstream side of the centrifugal blower, there are a heat exchange unit (a portion that performs air conditioning by cooling and heating with a heat exchanger, an electric heater, etc.) and a wind distribution unit (a vehicle for conditioned air). A part for adjusting the blowout and distribution to the chamber). The vehicle air conditioner is configured by combining the centrifugal blower, the heat exchange unit, and the air distribution unit. In many cases, the heat exchange unit and the air distribution unit are integrated to form a heat exchange / air distribution unit, but the heat exchange unit and the air distribution unit may be configured as separate units. The heat exchange unit and the air distribution unit will be described later in the description of the third embodiment.

The lower part of the separation cylinder 50 </ b> A is inserted into the scroll housing 12 through the suction port 13. As can be seen from FIGS. 2A to 2D, the shape of the inflow opening 51A at the upper end of the separation cylinder 50A (the shape seen from the upper side in the axial direction) is generally rectangular. The cross section of the central portion of the separation cylinder 50A is circular (or generally circular). The cross-sectional shape of the separation cylinder 50A smoothly transitions from a rectangle to a circle as it approaches the center from the upper end. Further, the position of the center of the cross section of the separation cylinder 50A changes smoothly as it approaches the center from the upper end. The lower end portion of the separation cylinder 50A has a flare shape that increases in diameter as it approaches the lower end. The shape of the outflow opening 52 at the lower end of the separation cylinder 50A is circular.

The lower end portion from the center portion of the separation cylinder 50A passes through the space on the radially inner side of the suction port 13 and extends in the axial direction to the space on the radially inner side of the blade row of the impeller 14. The upper end of the separation cylinder 50 </ b> A is located outside the scroll housing 12 (above the suction port 13 in the axial direction). The lower end of the separation cylinder 50 </ b> A is located on the radially inner side of the blade row of the impeller 14.

The separation cylinder 50A having the illustrated shape cannot be integrally formed by the resin injection molding technique, or if possible, it is very difficult. Therefore, it is preferable to manufacture the separation cylinder 50A by connecting two or more pieces that are separately injection-molded by a technique such as adhesion or fitting. At least a part of the separation cylinder 50A may be integrally formed with at least a part of the scroll housing 12 or at least a part of an air intake housing 30A described later.

The separation cylinder 50A is a first air flow that flows the air sucked into the scroll housing 12 into the lower half part (first axial direction part) 141 of the blade row of the impeller 14 through the inside of the separation cylinder 50A. And the second air flow that passes through the outer side of the separation cylinder 50A and flows into the upper half (second axial direction portion) 142 of the blade row of the impeller 14.

An air intake housing 30 </ b> A is connected to the upper side of the scroll housing 12. The scroll housing 12 and the air intake housing 30A may be integrally formed, or may be connected separately by a method such as screwing, bonding, or fitting after being separately manufactured. The scroll housing 12 and the air intake housing 30A form part of the air conditioner casing.

The air intake housing 30A has an outside air inlet 31A, a first inside air inlet 32A, and a second inside air inlet 32B. The outside air inlet 31A is connected to an outlet (not shown) of an outside air introduction path provided in the vehicle or is in the vicinity of the outlet. Outside air (air taken from the outside of the vehicle) can be introduced into the air intake housing 30A via the outside air inlet 31A. The first inside air inlet 32A and the second inside air inlet 32B are opened in the vehicle interior, and the inside air (vehicle interior air) can be introduced into the air intake housing 30A.

A first switching door 40A and a second switching door 40B are provided in the air intake housing 30A.

The first switching door 40A opens the outside air inlet 31A and closes the first inside air inlet 32A (the position shown in FIGS. 1 and 3A), and closes the outside air inlet 31A and the first inside air. It is movable between a second position (the position shown in FIGS. 1 and 3B) that opens the intake port 32A. The second switching door 40B is movable between a first position where the second inside air intake port 32B is opened and a second position where the second inside air intake port 32B is closed. The second switching door 40B may be referred to as an inside air intake door. The second switching door 40B in the first position prevents the inside air introduced into the air intake housing 30A from the second inside air inlet 32B from flowing outside the separation cylinder 50A.

As shown in FIG. 7A, the second switching door 40B has an arc-shaped cross section supported by a rotating shaft 41 that is rotationally driven by an actuator 42 such as a rotary motor via a pair of fan-shaped supports 44. It has a closing body 43. By operating the actuator 42, the closing body 43 and the support body 44 rotate around the rotation axis O. The second switching door 40B may be called a rotary door.

The air intake housing 30A has a plurality of openings 32E1 and 32E2 arranged in a lattice window shape. These openings 32E1 and 32E2 are provided as a second inside air intake port 32B schematically shown in FIG. In the lattice-like frame body between the adjacent openings 32E1 and 32E2, the rigidity and strength of the air intake housing 30A, which is usually formed by resin injection molding, is reduced by providing the second internal air intake port 32B. Is provided. Further, a relatively large object is prevented from being introduced into the air conditioner by air introduced from the passenger compartment.

When the second switching door 40B is in the closed position that closes the second inside air intake port 32B, the closing body 43 faces close to the opening 32E1, and the support body 44 faces close to the opening 32E2.

Since the structure of the first switching door 40A is the same as that of the second switching door 40B, illustration and description of the structure are omitted.

In the air intake housing 30A, there is air between the area where the outside air inlet 31A, the first inside air inlet 32A and the second inside air inlet 32B are provided, and the inflow opening 51A at the upper end of the separation cylinder 50A. A filter 35 is provided to remove contaminants such as dust and particles contained therein and a strange odor. The filter 35 is inserted into a slot or rail provided in the air intake housing 30A, and is held at a position close to the inflow opening 51A of the separation cylinder 50A.

2B is a cross-sectional view taken along the line IIB-IIB in FIG. 1, that is, a plane including the inflow opening 51A (more precisely, near the edge of the separation cylinder 50A forming the inflow opening 51A). It is sectional drawing obtained by cut | disconnecting the air intake housing 30A. The edge of the separation cylinder 50A is generally rectangular, and has four edge portions 511, 512, 513, 514 corresponding to the four sides of the rectangle. The cross section of the air intake housing 30A shown in FIG. 2B can be divided into two regions, a first region and a second region, by a virtual dividing line DL. In the illustrated example, the virtual dividing line DL divides a substantially rectangular or square cross section of the air intake housing 30A into a rectangular first region corresponding to the inflow opening 51A and a rectangular second region other than the first region. To do.

In FIG. 2A, a rectangular inflow opening 51 </ b> A of the separation cylinder 50 </ b> A viewed through the filter 35 (dots are attached in FIG. 2A) is drawn with a broken line. Since the filter 35 provides resistance to the air passing through the filter 35 but does not significantly affect the air traveling direction, the trueness of the first region (the region corresponding to the inflow opening 51A) of the filter 35 is increased. Almost all of the air flowing into the filter 35 in the upper part flows into the inside of the separation cylinder 50A, and almost all of the air flowing into the filter 35 in the part directly above the second region flows outside the separation cylinder 50A. become.

The air intake housing 30A has an auxiliary internal air inlet 38 that can take in the internal air into the air intake housing 30A separately from the first internal air inlet 32A and the second internal air inlet 32B described above. . The auxiliary inside air introduction port 38 is provided at a position where air introduced from the auxiliary inside air introduction port 38 into the air intake housing 30A flows into the separation cylinder 50A via the inflow opening 51A of the separation cylinder 50A. Yes.

The auxiliary internal air introduction port 38 is a virtual extension column CL1 (FIG. 3) in which the internal air introduced into the air intake housing 30A from the auxiliary internal air introduction port 38 extends in the direction away from the separation cylinder 50A in the axial direction with the inflow opening 51A as the bottom surface. 1 is also preferably provided at such a position as to be supplied inside. Here, the “column” is a geometric term that means a three-dimensional portion of a portion through which the plane passes when the figure that becomes the bottom surface (here, the surface of the inflow opening 51A) is translated perpendicularly to the bottom surface. It is.

The auxiliary inside air introduction port 38 is a horizontal distance from the virtual dividing line DL to the auxiliary inside air introduction port 38 when the inflow opening 51A is viewed from the upper side in the axial direction (specifically, orthogonal to the axial direction and the virtual dividing line DL). The distance (measured in the orthogonal direction) is preferably as large as possible, and the axial distance from the inflow opening 51A (if there is a filter 35) to the auxiliary inside air inlet 38 is preferably as small as possible. By doing so, the inside air introduced into the air intake housing 30A from the auxiliary inside air introduction port 38 can be more reliably flowed into the separation cylinder 50A.

In the illustrated embodiment, an example in which the auxiliary inside air introduction port 38 is provided in the wall body 334 of the air intake housing 30A farthest from the virtual dividing line DL is shown as an example of the above-described preferable arrangement position. Yes. The auxiliary inside air introduction port 38 can be provided in a portion of the wall bodies 331 and 333 of the air intake housing 30A that is closer to the first region (inflow opening 51A side) than the virtual dividing line DL. It is preferable to provide the wall body 334 far from the DL.

It is preferable to provide a valve 39 for controlling the inflow of the inside air into the air intake housing 30 </ b> A via the auxiliary inside air introduction port 38 in the auxiliary inside air introduction port 38. In the valve 39, the difference between the secondary pressure (pressure P2 in the air intake housing 30A) and the primary pressure (pressure P1 outside the air intake housing 30A) (differential pressure (P1-P2)) is a predetermined threshold value. It is preferable to use a reed valve that opens when it becomes larger. When the impeller 14 rotates at high speed, that is, when the scroll blower needs to send out air at a large flow rate, the differential pressure (P1-P2) increases.

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

When the vehicle air conditioner is operated in the outside air mode, as shown in FIG. 3A, the first switching door 40A is located at the first position to open the outside air inlet 31A and close the first inside air inlet 32A. The second switching door is located at the second position and closes the second inside air inlet 32B. At this time, the outside air AE introduced into the air intake housing 30A from the outside air inlet 31A passes through the inside and outside of the separation cylinder 50A, and then the lower half portion 141 and the upper half portion of the blade 140 of the impeller 14 142 respectively passes through the first air flow path 19 and the second air flow path 20 of the scroll housing 12. At this time, when the differential pressure (P1-P2) increases, the valve 39 opens and the inside air is introduced into the air intake housing 30A from the auxiliary inside air introduction port 38.

Since almost all of the inside air introduced into the air intake housing 30A from the auxiliary inside air introduction port 38 flows into the separation cylinder 50A, the inside air introduced from the auxiliary inside air introduction port 38 into the air intake housing 30A is scrolled. It does not flow into the second air flow path 20 of the housing 12. That is, the inside air does not flow into the space near the defroster outlet in the air distribution section. For this reason, window clearness can be ensured. For this reason, according to this embodiment, when heating operation is performed in the outside air mode, it is possible to improve the heating efficiency by auxiliary introduction of the inside air while ensuring window clearness.

When the vehicle air conditioner is operated in the inside air mode, as shown in FIG. 3B, the first switching door 40A is located at the second position to close the outside air inlet 31A and open the first inside air inlet 32A. The second switching door 40B is located at the first position and opens the second inside air inlet 32B. At this time, the inside air AR introduced into the air intake housing 30A from the first inside air inlet 32A and the second inside air inlet 32B passes through the inside and outside of the separation cylinder 50A, and then the blade 140 of the impeller 14 It passes through the lower half 141 and the upper half 142 respectively, and flows into the first air passage 19 and the second air passage 20 of the scroll housing 12.

When the vehicle air conditioner is operated in the two-layer flow mode, as shown in FIG. 1, the first switching door 40A is located at the first position to open the outside air inlet 31A and to open the first inside air inlet 32A. The second switching door 40B is located at the first position and opens the second inside air inlet 32B. At this time, the outside air AE introduced into the air intake housing 30A from the outside air inlet 31A passes through the outer side of the separation cylinder 50A, passes through the upper half 142 of the blade 140 of the impeller 14, and the scroll housing 12 It flows into the second air flow path 20. The inside air AR introduced into the air intake housing 30 </ b> A from the second inside air inlet 32 </ b> B passes through the lower half 141 of the blade 140 of the impeller 14 and flows into the first air flow path 19 of the scroll housing 12.

Also in the inside air mode and the two-layer flow mode, the valve 39 is opened according to the differential pressure (P1-P2), and the inside air is introduced into the air intake housing 30A from the auxiliary inside air introduction port 38. For this reason, the taking-in efficiency of the inside air into the air intake housing 30A can be improved, and the burden on the centrifugal fan 1A can be reduced.

Next, a second embodiment will be described with reference to FIGS. In the centrifugal blower 1B used in the second embodiment, the shape of the separation cylinder and the configuration of the portion located above the upper end of the separation cylinder in the air intake housing are used in the first embodiment. Unlike the centrifugal blower 1A, the rest is the same as in the first embodiment. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

The air intake housing 30B of the second embodiment has a first outside air inlet 31C and a second outside air inlet 31D, and a first inside air inlet 32C and a second inside air inlet 32D. Although detailed illustration and description are omitted, as in the first embodiment, outside air is supplied to the first outside air inlet 31C and the second outside air inlet 31D via an outside air introduction path provided in the vehicle. The inside air is supplied to the inside air inlet 32C and the second inside air inlet 32D through an inside air introduction path provided in the vehicle.

The air taken into the air intake housing 30B from the first outside air inlet 31C and the second inside air inlet 32D flows outside the separation cylinder 50B of the second embodiment. The air taken into the air intake housing 30B from the second outside air inlet 31D and the first inside air inlet 32C flows inside the separation cylinder 50B.

By rotating the switching door 40C around the rotation shaft 48, the first outside air intake port 31C can be opened and closed. By rotating the switching door 40D around the rotation shaft 41, either the second outside air inlet 31D or the first inside air inlet 32C can be opened and the other can be closed. By rotating the switching door 40E around the rotation shaft 48, the second inside air intake port 32D can be opened and closed. Note that the switching door 40D may be referred to as an inside air intake door.

In the outside air mode, the switching doors 40C, 40D, and 40E are opened so that the first outside air inlet 31C and the second outside air inlet 31D are opened and the first inside air inlet 32C and the second inside air inlet 32D are closed. Adjusted. In the inside air mode, the switching doors 40C, 40D, and 40E are closed so that the first outside air inlet 31C and the second outside air inlet 31D are closed and the first inside air inlet 32C and the second inside air inlet 32D are opened. Adjusted. In the two-layer flow mode, the switching doors 40C, 40D, 40C, 40D, and 31C are opened so that the first outside air inlet 31C and the first inside air inlet 32C are opened and the second outside air inlet 31D and the second inside air inlet 32D are closed. 40E is adjusted.

As can be seen from FIGS. 4 to 6, as in the first embodiment, the shape of the inflow opening 51B at the upper end of the separation cylinder 50B (the shape seen from the upper side in the axial direction) is generally rectangular, and the central portion of the separation cylinder 50B The cross section of is circular (or generally circular). The cross-sectional shape of the separation cylinder 50B smoothly changes from a rectangle to a circle as it approaches the center from the upper end. However, unlike the separation cylinder 50A of the first embodiment, the center of the cross section of the separation cylinder 50B of the second embodiment is located on a straight line extending in the axial direction (direction of the rotation axis Ax) from the upper end to the lower end. ing.

6 is a cross-sectional view taken along the line VI-VI of FIG. 4, that is, a plane including the inflow opening 51B (more precisely, near the edge of the separation cylinder 50B forming the inflow opening 51B). It is sectional drawing obtained by cut | disconnecting the air intake housing 30B. The edge of the separation cylinder 50B is generally rectangular. The cross section of the air intake housing 30B shown in FIG. 6 can be divided into three regions including a central first region and second and third regions on both sides by virtual dividing lines DL1 and DL2. it can. In the illustrated example, the virtual dividing lines DL1 and DL2 have a substantially rectangular or square cross section of the air intake housing 30A, a rectangular first central region corresponding to the inflow opening 51B, and rectangular second and second sides on both sides thereof. Divide into 3 areas.

The air that has passed through the first region is introduced into the scroll housing 12 through the inside of the separation tube 50B, and the air that has passed through the second region and the third region is outside the separation tube 50B and the suction port 13. It is introduced into the scroll housing 12 through the inside.

In the air intake housing 30B of the second embodiment, the auxiliary internal air introduction port 38 that can take in the internal air into the air intake housing 30B separately from the first internal air intake 32C and the second internal air intake 32D described above. have. The auxiliary inside air introduction port 38 is provided at a position where air introduced from the auxiliary inside air introduction port 38 into the air intake housing 30B flows into the separation cylinder 50B through the inflow opening 51B of the separation cylinder 50B. Yes.

The auxiliary internal air introduction port 38 is a virtual extension column CL2 (FIG. 2) in which the internal air introduced into the air intake housing 30B from the auxiliary internal air introduction port 38 extends in the direction away from the separation cylinder 50B in the axial direction with the inflow opening 51B as a bottom surface. 4 and FIG. 5).

In the second embodiment, the auxiliary inside air introduction port 38 is provided in a region between the two virtual dividing lines DL1 and DL2 in the wall bodies 331 and 333 (331 in the illustrated example) of the air intake housing 30B. It has been. As in the first embodiment, a valve 39 can be provided in the auxiliary inside air introduction port 38.

Also in the second embodiment, the same effect as in the first embodiment can be obtained by providing the auxiliary inside air introduction port 38.

Next, an air conditioner according to a third embodiment will be described with reference to FIGS. The configuration of the centrifugal blower 1C used in the third embodiment is substantially the same as the centrifugal blowers 1A and 1B used in the first and second embodiments in the structure of the downstream portion of the separation cylinder and the structure of the scroll housing. But other parts are different. Below, it demonstrates centering around difference. Moreover, in 3rd Embodiment, the same code | symbol is attached | subjected about the same part as 1st and 2nd embodiment, and duplication description is abbreviate | omitted.

In the third embodiment, the centrifugal blower 1C is installed such that the direction of the rotation axis Ax of the impeller 14 of the centrifugal blower 1C faces the horizontal direction, specifically, the left-right direction of the vehicle. The scroll housing 12 used in the centrifugal fan 1C of the third embodiment differs from the scroll housing 12 used in the first and second embodiments in that the direction of the rotation axis Ax is in the horizontal direction, and the structure itself. Is substantially the same as the scroll housing 12 used in the first and second embodiments.

The air intake housing 30C has a substantially cylindrical shape as a whole with the rotation axis Ax as the central axis. The side peripheral surface of the air intake housing 30C is provided with an outside air inlet 31F for taking outside air into the internal space of the air intake housing 30C, and an inside air inlet 32F for taking inside air.

The separation cylinder 50C used in the third embodiment includes a generally cylindrical main body portion 54 having a rotation axis Ax (or an axis parallel to the rotation axis Ax at a position slightly deviated from the rotation axis Ax) as a central axis. And an outside air passage portion 55 and an inside air passage portion 56 that diverge from the main body portion 54 and extend in the radial direction (a direction perpendicular to or substantially perpendicular to the central axis starting from the central axis of the main body portion 54). . The outside air passage portion 55 and the inside air passage portion 56 have open ends 57 and 58 at positions farthest from the main body portion 54. The opening end 58 corresponds to at least one inflow opening (main inflow opening) that allows air to flow into the separation cylinder 50C.

The circumferential widths of the opening end 57 of the outside air passage portion 55 and the opening end 58 of the inside air passage portion 56 (the width measured in the circumferential direction around the central axis of the main body portion 54) are substantially equal to each other. Further, there is a circumferential gap between the outside air passage portion 55 and the inside air passage portion 56, and the width of the circumferential gap is the circumferential width of the open ends 57 and 58 of the outside air passage portion 55 and the inside air passage portion 56. Is substantially equal. The outside air passage portion 55 and the inside air passage portion 56 are branched from the main body portion 54 at the same axial position (position with respect to the central axis direction of the main body portion 54). The outside air passage portion 55 and the inside air passage portion 56 have substantially the same shape. The various features described above with regard to the dimensions and positions of the outside air passage portion 55 and the inside air passage portion 56 are advantageous when the flow path is switched by a single switching door 40F described later.

The main body portion 54 of the separation cylinder 50 </ b> C extends in the axial direction through the suction port 13 of the scroll housing 12. The shape of the right end of the main body portion 54 in the scroll housing 12 and the positional relationship with the impeller 14 are the same as the shape of the lower ends of the separation cylinders 50A and 50B and the positional relationship with the impeller 14 in the first and second embodiments. Is the same.

In particular, as shown in FIG. 9, the outside air inlet 31F of the air intake housing 30C has a first region 31F1 facing the open end 57 of the outside air passage portion 55 of the separation cylinder 50C, and the first region 31F1. And a second region 31F2 adjacent in the circumferential direction of the main body portion 54 of the separation cylinder 50C. The outside air introduced into the air intake housing 30C via the first region 31F1 of the outside air inlet 31F flows in the outside air passage portion 55 and the main body portion 54 of the separation cylinder 50C, and flows into the scroll housing 12. On the other hand, the outside air introduced into the air intake housing 30C via the second region 31F2 of the outside air inlet 31F flows outside the separation cylinder 50C in the air intake housing 30C, and is out of the inlet 13 of the scroll housing 12 Flows into the scroll housing 12 through a region outside the main body portion 54 of the separation cylinder 50C.

The air intake port 32F of the air intake housing 30C includes a first region 32F1 facing the open end (inflow opening) 58 of the internal air passage portion 56 of the separation tube 50C, and the main body of the separation tube 50C with respect to the first region 32F1. And a second region 32F2 adjacent to the portion 54 in the circumferential direction. The inside air taken into the air intake housing 30C via the first region 32F1 of the inside air inlet 32F flows through the inside air passage portion 56 and the main body portion 54 of the separation cylinder 50C, and flows into the scroll housing 12. On the other hand, the internal air taken into the air intake housing 30C via the second region 32F2 of the internal air intake port 32F flows outside the separation cylinder 50C in the air intake housing 30C, and out of the suction port 13 of the scroll housing 12 Flows into the scroll housing 12 through a region outside the main body portion 54 of the separation cylinder 50C.

In particular, as shown in FIG. 9, the air intake housing 30C includes a second region 31F2 of the outside air inlet 31F, a first region 31F1 of the outside air inlet 31F, a second region 32F2 of the inside air inlet 32F, and an inside air inlet. The first regions 32F1 of 32F are arranged in this order in a counterclockwise direction (a counterclockwise direction about the axis Ax of the rotation shaft when the air intake housing 30C is viewed from the left side). The circumferential widths of these regions are substantially the same. One rotary type switching door 40F that can simultaneously close two adjacent areas of these four areas (31F2, 31F1, 32F2, 32F1) is provided.

The switching door 40F can be swung in the circumferential direction of the main body portion 54 of the separation cylinder 50C to take at least the following three positions.



A first position for opening the first region 31F1 and the second region 31F2 of the outside air inlet 31F of the air intake housing and closing the first region 32F1 and the second region 32F2 of the inside air inlet 32F (see FIG. 11A); . The outside air AE that has passed through the first region 31F1 of the outside air inlet 31F flows into the main body portion 54 of the separation cylinder 50C. Outside air AE that has passed through the second region 31F2 of the outside air inlet 31F flows into the outside of the main body portion 54 of the separation cylinder 50C in the suction port 13.



The first region 31F1 of the outside air inlet 31F of the air intake housing 30C is closed, the second region 31F2 of the outside air inlet is opened, and the first region 32F1 of the inside air inlet 32F of the air intake housing is opened. And a second position for closing the second region 32F2 of the inside air intake (see FIG. 11B). The inside air AR that has passed through the first region 32F1 of the inside air inlet 32F flows into the main body portion 54 of the separation cylinder 50C. Outside air AE that has passed through the second region 31F2 of the outside air inlet 31F flows into the outside of the main body portion 54 of the separation cylinder 50C in the suction port 13.



A third position for closing the first region 31F1 and the second region 31F2 of the outside air inlet 31F of the air intake housing 30C and opening the first region 32F1 and the second region 32F2 of the inside air inlet 32F (see FIG. 11C); ). The inside air AR that has passed through the first region 32F1 of the inside air inlet 32F flows into the main body portion 54 of the separation cylinder 50C. The inside air AR that has passed through the second region 32F2 of the inside air inlet 32F flows into the outside of the main body portion 54 of the separation cylinder 50C in the suction port 13.

In the outside air mode, the switching door 40F is located at the first position, and outside air is supplied to both the first air flow path 19 and the second air flow path 20 of the scroll housing 12. In the two-layer flow mode, the switching door 40F is located at the second position, and the internal air is supplied to the first air flow path 19 of the scroll housing 12 and the external air is supplied to the second air flow path 20. In the inside air mode, the switching door 40F is located at the third position, and the inside air is supplied to both the first air passage 19 and the second air passage 20 of the scroll housing 12.

Next, an example of a specific structure of the separation cylinder 50C and the switching door 40F will be described with reference to FIG. The separation cylinder 50C is composed of two parts (first part and second part) separately formed by, for example, a resin injection molding technique. The first part is a part in which a part 541 of the main body part 54 of the separation cylinder 50C far from the motor 16, and the outside air passage part 55 and the inside air passage part 56 are integrally formed. The second part includes a portion 542 (a portion including a flare-like portion) close to the motor 16 in the main body portion 54. The end portion of the portion 542 is provided with a reduced diameter end portion 544 formed by reducing the outer diameter of the end portion.

The switching door 40F is also composed of two parts formed separately by, for example, a resin injection molding technique, that is, a first part 411 far from the motor 16 and a second part 412 close to the motor 16. The first component 411 includes a shielding part 415 having an arcuate cross section for opening and closing the above-described four regions (31F1, 31F2, 32F1, and 32F2), a turning shaft 413 serving as a turning center of the shielding part 415, and a shielding part. And a fan-shaped connecting portion 414 that connects the rotating shaft 413 and the rotating shaft 413.

The second part 412 includes a ring-shaped portion 417 that is fitted into the reduced diameter end portion 544 of the portion 542 of the main body portion 54 of the separation cylinder 50 </ b> C, and a fan-shaped connecting portion 418. The connecting portion 418 is provided with a groove 419, and a protrusion 416 provided at the free end of the shielding portion 415 is fitted into the groove 419. Thereby, the first component 411 and the second component 412 of the switching door 40F are coupled. The ring-shaped portion 417 fitted into the reduced diameter end portion 544 serves as a bearing that supports the switching door 40F so as to be rotatable about the rotation axis. As schematically shown in FIG. 8, the end portion of the main body portion 54 of the separation cylinder 50C on the side close to the motor 16 of the portion 541 is fitted into the reduced diameter end portion 544 of the portion 542 of the main body portion 54. .

As shown in FIG. 8, the pivot shaft 413 of the switching door 40F extends to the outside of the air intake housing 30C through a through hole formed in the air intake housing 30C. The turning shaft 413 can be rotated by an actuator 42 attached to the outer wall surface of the air intake housing 30C.

As shown in FIG. 10, the axial end of the main body portion 54 (portion 541) of the separation cylinder 50 </ b> C far from the motor 16 is open. Since the wall of the air intake housing 30C is close to the open end (to the extent that the turning of the switching door 40F is not hindered), the open end is substantially formed by the wall of the air intake housing 30C. Can be regarded as being obstructed. In other words, the leakage of air from the inside of the separation cylinder 50C (including the outside air passage portion 55 and the inside air passage portion 56) to the outside through the gap between the open end and the wall of the air intake housing 30C or the The reverse air flow does not occur at a level that causes a problem in the performance of the air conditioner.

In order to maintain the separation cylinder 50C at a predetermined position, it is necessary to fix the separation cylinder 50C to the scroll housing 12 and / or the air intake housing 30C. As a fixing method, for example, as schematically shown in FIG. 8, one or a plurality of connecting members 545 extending from a portion 541 of the main body portion 54 of the separation cylinder 50C toward the wall of the air intake housing 30C. It is conceivable to provide (shown by a one-dot chain line) and fix the tip of the connecting member 545 to the inner wall surface of the air intake housing 30C. In addition, a plurality of connecting members 546 (shown by alternate long and short dash lines) extending from the main body portion 54 of the separation cylinder 50C to the edge of the suction port 13 of the scroll housing 12 are provided. It is conceivable to fix to the edge of the inlet 13 of the housing 12. The fixing method of the separation cylinder 50C described above can also be used in the first and second embodiments.

In the third embodiment, the auxiliary internal air introduction port 38 is provided in the wall body of the air intake housing 30 </ b> C that faces the open end (the open end at the left end in FIG. 8) of the main body portion 54 of the separation cylinder 50 </ b> C. As in the first and second embodiments, a valve 39 can be provided in the auxiliary inside air introduction port 38. The auxiliary inside air introduction port 38 is in a position where it is not blocked by the switching door 40F, and the position where the operation of the valve 39 is not hindered by the switching door 40F (in FIG. 8, above the rotational axis Ax). ). Therefore, in the third embodiment, the separation cylinder 50C includes the main inflow opening 58 through which the inside air introduced into the air intake housing 30C from the inside air inlet 32F can be introduced into the internal space of the separation cylinder 50, and the auxiliary inside air introduction. It has an auxiliary inflow opening 51C (open end of the main body portion 54) through which the inside air introduced into the air intake housing 30C from the port 38 can flow into the internal space of the separation cylinder 50. .

Next, the heat exchange / air distribution unit 60 connected to the centrifugal fan 1C will be briefly described.

As shown in FIG. 9, the heat exchange / air distribution unit 60 includes a heat exchange part (a part that performs air conditioning by cooling and heating using a heat exchanger, an electric heater, etc.) and an air distribution part (to the conditioned air compartment). The part which adjusts the blowing and distribution of the above is provided. Specifically, the heat exchange / air distribution unit 60 is connected to the first air flow path 61 connected to the first air flow path 19 of the scroll housing 12 and the second air flow path 20 of the scroll housing 12. And a second air flow path 62. The first air flow path 61 and the second air flow path 62 of the air distribution unit 60 are partitioned by a partition wall 64. A cooling heat exchanger 63 (evaporator) is interposed in the first air flow path 61 and the second air flow path 62. On the downstream side of the cooling heat exchanger 63, a heating heat exchanger 66 is interposed in the upper half of the first air flow path 61 and the lower half of the second air flow path 62. The cooling heat exchanger 63 cools the air passing through the cooling heat exchanger 63 by heat exchange between the refrigerant flowing through the refrigerant passage of the cooling heat exchanger 63 and the air flowing outside the refrigerant passage. . The heating heat exchanger 66 heats the air passing through the heating heat exchanger 66. The heating heat exchanger 66 may be of any type that heats air by exchanging heat with hot water or refrigerant passing through the inside, or an electric heating type.

Between the cooling heat exchanger 63 and the heating heat exchanger 66, at least one temperature control door 65 is provided in each of the first air flow path 61 and the second air flow path 62. Each temperature control door 65 has an amount of air passing through the heating heat exchanger 66 with respect to the total amount of air passing through the cooling heat exchanger 63 in each of the first air flow path 61 and the second air flow path 62. Adjust the ratio.

The heat exchange / air distribution unit 60 includes a defroster air outlet 67, a vent air outlet 68, and a foot air outlet 69, and a plurality of air distribution doors 70, 71, 72 provided in the heat exchange / air distribution unit 60. The destination of the conditioned air is adjusted. As can be seen from FIG. 9, the air flowing through the first air flow path 61 connected to the first air flow path 19 of the scroll housing 12 is a space close to the foot outlet 69 (the lower side of the air distribution section). ). The air flowing through the second air flow path 62 connected to the second air flow path 20 of the scroll housing 12 is a space close to the defroster air outlet 67 and the vent air outlet 68 (the space above the air distribution section). To leak.

The heat exchange / air distribution unit 60 having the same or substantially the same configuration as the heat exchange / air distribution unit 60 shown in FIG. 9 includes centrifugal fans 1A and 1B according to the first and second embodiments, and a centrifugal fan described later. 1D can be connected in a similar manner. Instead of the heat exchange / air distribution unit 60 shown in FIG. 9, any known heat exchange / air distribution unit configured for a two-layer flow air conditioner may be used.

When the air conditioner is operated in the heating mode, the defroster outlet 67 is opened, the vent outlet 68 is closed, and the foot outlet 69 is opened. Both temperature control doors 65 are located at a position where all of the air that has passed through the cooling heat exchanger 63 passes through the heating heat exchanger 66. The air distribution door 72 is located at a position (position shown in FIG. 9) that completely or substantially blocks communication between the space above the air distribution door 72 and the space below. At this time, if the air conditioner is operated in the outside air mode as described above, the second air flow path 20 of the scroll housing 12 and the second air flow path 62 of the heat exchange / air distribution unit 60 from the defroster outlet 67. Since the conditioned air (low-humidity air) that is substantially derived only from the outside air that has passed through is blown out, it is possible to ensure window clearness. On the other hand, conditioned air derived from mixed air of outside air and inside air that has passed through the first air flow path 19 of the scroll housing 12 and the first air flow path 61 of the heat exchange / air distribution unit 60 is blown out from the foot outlet 69. Is done.

Since the inside air is mixed in the conditioned air blown from the foot outlet 69, the humidity and temperature are higher than that of the conditioned air blown from the defroster outlet 67. Even if the humidity of the conditioned air blown from the foot outlet 69 is somewhat high, the window clearness is not adversely affected. Moreover, since the temperature of the conditioned air blown out from the foot outlet 69 is high, the vehicle interior can be warmed with little energy, or the temperature can be prevented from decreasing, which contributes to energy saving.

FIG. 12 shows a fourth embodiment. In the fourth embodiment, the separation cylinder 50D includes, in addition to the above-described outside air passage portion 55 and the inside air passage portion 56, an auxiliary passage portion 59 that branches from the main body portion 54 outside the scroll housing 12 and extends radially outward. In addition. Preferably, the axial position of the auxiliary flow path portion 59 is closer to the motor 16 than the outside air passage portion 55 and the inside air passage portion 56. Of the wall body of the air intake housing 30 </ b> C, a wall body facing the open end of the auxiliary flow path portion 59 is provided with an auxiliary inside air introduction port 38.

Therefore, in the fourth embodiment, the separation cylinder 50D includes the main inflow opening 58 through which the inside air introduced into the air intake housing 30C from the inside air inlet 32F can be introduced into the internal space of the separation cylinder 50, and the auxiliary inside air introduction. It has auxiliary inflow opening 51D (open end of the above-mentioned auxiliary flow path part 59) which can flow the inside air introduced into air intake housing 30D from mouth 38 into the interior space of separation cylinder 50D. become.

Also in the fourth embodiment, a valve 39 can be provided in the auxiliary inside air introduction port 38 as in the first to third embodiments. Also in 3rd and 4th embodiment, the effect similar to 1st and 2nd embodiment can be acquired by providing the auxiliary | assistant inside air introduction port 38. FIG.

In the first to fourth embodiments, the valve 39 provided in the auxiliary inside air introduction port 38 is a reed valve. However, the valve 39 is not limited to this, and may be another type of valve. The valve 39 is a valve that is passively opened when the difference between the secondary pressure and the primary pressure is greater than a predetermined threshold value. However, the valve 39 is not limited to this, and is a valve driven by an actuator. There may be.

The size (opening area) of the auxiliary inside air inlet 38 is preferably smaller than the inside air inlet provided in the air intake housings 30A to 30D.

In the above first to fourth embodiments, the auxiliary inside air introduction port 38 is provided in the wall body of the air intake housings 30A to 30D, but is not limited to this, for example, as shown in FIG. 7B, You may provide in switching door 40B (in the case of 1st Embodiment) or switching door 40D.

In the case of the first embodiment, when the switching door 40B is located at the position indicated by the broken line in FIG. 1 and the inside air inlet 32B is closed, the auxiliary inside air inlet provided in the switching door 40B in the form as shown in FIG. 7B. From 38, the inside air is supplied to the inside of the virtual extension column CL1. In this case, air flow from the outside to the inside of the function as a check valve such as a reed valve (that is, the closing body 43 of the switching door 40B (see FIG. 7A)) is allowed to the auxiliary inside air introduction port 38. However, it is preferable to provide a valve 39 having a function that does not allow the reverse. By providing such a valve, when the secondary pressure (pressure P2 in the air intake housing 30A) is higher than the primary pressure (pressure P1 outside the air intake housing 30A), the temperature is adjusted. The air is prevented from flowing into the passenger compartment through the auxiliary inside air inlet 38 without being introduced. The case where the secondary side pressure becomes higher than the primary side pressure is, for example, a condition in which the vehicle travels and air pressure called ram pressure is generated and the pressure of the outside air AE increases, and the impeller 14 rotates. This is a case where a condition where the amount of air sucked by the blower is low overlaps with the air.

In FIG. 7A, the support body 44 of the switching door (40B or 40D) has a fan shape, and the opening 32E2 is formed in the wall body of the air intake housing (30A or 30B) facing the support body 44. It is not limited to this, The support body 44 has a big opening in the center part, and the opening 32E2 does not need to be formed. In this case, the auxiliary inside air introduction port 38 or the auxiliary inside air introduction port 38 and the valve 39 may be provided at the place where the opening 32E2 was provided. Also in this case, the inside air can be supplementarily introduced into the air intake housing (30A or 30B) from the auxiliary inside air inlet 38 even when the switching door (40B or 40D) closes the inside air inlet.

12 Scroll housing



120 Discharge port



13 Suction port



14 impeller



140 wings



141 1st axial direction part



142 Second axial direction part



16 motor



160 Rotating shaft



18 partition wall



19 First air flow path



20 Second air flow path



30A, 30B, 30C, 30D Air intake housing



31A, 31C, 31D, 31F Outside air intake



32A, 32B, 32C, 32D, 32F



331, 332, 333, 334 Wall



38 Auxiliary shy air inlet



39 Valve



40A, 40B, 40C, 40D, 40E, 40F Switching door



50A, 50B, 50C, 50D Separation cylinder



51A, 51B, 51C, 51D Inflow opening



51C; 51D Auxiliary inflow opening



52 Outflow opening



55 Outside air passage



56 Inside air passage



58 Main inlet opening



59 Auxiliary flow path



CL1, CL2 Virtual extension column



DL, DL1, DL2 Virtual dividing line

Claims (13)

An air conditioner for a vehicle,



A plurality of blades (140) arranged in the circumferential direction are driven by a rotating shaft (160) of a motor (16), and the plurality of blades are adjacent to the motor in the axial direction of the rotating shaft. An impeller (14) having a first axial portion (141) and a second axial portion (142) that is more distant from the motor than the first axial portion;



A scroll housing having an internal space for accommodating the impeller (14), a suction port (13) opening in the axial direction of the rotating shaft, and a discharge port (120) opening in the circumferential direction of the impeller ( 12)



A region between the inner peripheral surface of the scroll housing and the outer peripheral surface of the impeller in the inner space of the scroll housing (12) and the inner space of the discharge port (120) are divided in the axial direction. A partition wall (18) forming a first air flow path (19) and a second air flow path (20),



An air intake housing (30A, 30B, 30C, 30D) having an internal space communicating with the suction port (13) of the scroll housing (12) for taking outside air into the internal space of the air intake housing. At least one outside air inlet (31A; 31C, 31D; 31F) and at least one inside air inlet (32A, 32B; 32C, 32D; 32F) for taking inside air into the internal space of the air intake housing; The air intake housing (30A, 30B, 30C, 30D) provided with,



At least one switching door (40A, 40B; 40C, 40D, 40E; 40F) for opening and closing the outside air inlet and the inside air inlet;



A separation cylinder (50A, 50B, 50C, 50D) extending through the suction port (13) of the scroll housing (12), wherein the separation cylinder causes air to flow into the separation cylinder. Outflow for allowing air to flow out from the inside of the separation cylinder while having at least one inflow opening (51A, 51B, 51C, 51D) in the air intake housing (30A, 30B, 30C, 30D). An opening (52) is provided in the scroll housing (12), and the air introduced into the scroll housing (12) through the outflow opening (52) of the separation cylinder is transferred to the impeller (14). The first air flow path (19) of the scroll housing (12) is guided through the first axial portion (141) of the wing of the blade, and the separation cylinder (5 ) And the air introduced into the scroll housing (12) through the inside of the suction port (13) through the second axial portion (142) of the blades of the impeller (14). The separation cylinder (50A, 50B, 50C, 50D) configured to guide the second air flow path (20),



An auxiliary internal air introduction port (38) capable of taking internal air into the air intake housing (30A, 30B, 30C, 30D) is provided in the wall body of the air intake housing or the switching door (40B; 40D). The auxiliary internal air introduction port (38) is provided so that the internal air introduced into the air intake housing from the auxiliary internal air introduction port (38) is the at least one inflow opening (51A, 51B, 51C, 51D). ) Is provided at such a position as to flow into the separation cylinder (50A, 50B, 50C, 50D) through the


The separation cylinder (50A, 50B) has a single inflow opening (51A, 51B) as the at least one inflow opening, and the separation cylinder (50) extends from the outflow opening (52) in the axial direction. The auxiliary internal air introduction port (38) extends from the auxiliary internal air introduction port into the air intake housing (30A, 30B). One inflow opening (51A, 51B) is provided at a position that is supplied to the inside of the virtual extension column (CL) extending in the direction away from the axial direction from the separation cylinder (50A, 50B) with the bottom face as the bottom. The air conditioner according to claim 1.


When the cross section of the air intake housing (30A) including the single inflow opening (51A) is divided into two regions including a first region and a second region by a single virtual dividing line (DL) The first region coincides with the single inflow opening (51A), and the air that has passed through the first region is introduced into the scroll housing (12) through the internal space of the separation cylinder (50A). The air that has passed through the second region is introduced into the scroll housing (12) through the outside of the separation cylinder and the inside of the suction port (13), and the auxiliary inside air introduction port (38). ) Is provided on the wall (331, 333, 334) of the air intake housing (30A) on the first region side of the virtual dividing line (DL). apparatus.


The cross section of the air intake housing (30B) including the single inflow opening (51B) is divided into a first region at the center by two virtual dividing lines (DL1, DL2), a second region on both sides and a second region. When divided into three regions consisting of three regions, the first region coincides with the single inflow opening, and the air that has passed through the first region passes through the internal space of the separation cylinder (50B). The air introduced into the scroll housing (12) and passed through the second region and the third is introduced into the scroll housing through the outside of the separation cylinder and the inside of the suction port (13). The auxiliary internal air introduction port (38) is provided in a wall body (331, 333) of the air intake housing between the two virtual dividing lines (DL1, DL2). The air conditioner described.


The separation cylinder (50C, 50D) serves as the at least one inflow opening for at least the inside air introduced into the air intake housing (30C, 30D) from the inside air inlet (32F) into the internal space of the separation cylinder. A main inflow opening (58) that can be made to flow in, and an auxiliary inflow opening (in which the inside air introduced into the air intake housing from the auxiliary inside air introduction port (38) can flow into the internal space of the separation cylinder ( 51C; 51D) The air conditioner of Claim 1.


The separation cylinder (50C, 50D) has the outflow opening (52) at one end and the body portion (54) extending in the axial direction through the suction port (13) of the scroll housing (12), An outer side of the scroll housing (12) diverges from the main body portion and extends radially outward. The main body portion is connected to the outside air intake port (31F) and the internal air intake port (of the air intake housing (30C, 30D)). 32F), and an outside air passage portion (55) and an inside air passage portion (56) respectively communicating with each other, and an opening at a tip of the inside air passage portion (56) is the main inflow opening (58). 5. The air conditioner according to 5.


An opening (51C) as the auxiliary inflow opening is provided at the other end of the main body portion (54) of the separation cylinder (50C), and the wall of the air intake housing (30C) facing the opening is provided with the opening (51C). The air conditioner according to claim 6, wherein an auxiliary inside air introduction port (38) is provided.


The separation cylinder (50D) further includes an auxiliary flow path portion (59) that branches from the main body portion outside the scroll housing (12) and extends radially outward, and the auxiliary flow path portion (59) The front opening is the auxiliary inflow opening (51D), and the auxiliary internal air introduction port (38) is provided on a wall of the air intake housing (30D) facing the auxiliary inflow opening. 6. The air conditioner according to 6.


The at least one switching door includes an inside air inlet door (40B; 40D) capable of opening and closing at least the inside air inlet (32B; 32C), and the auxiliary inside air inlet (38) is the inside air inlet. The air conditioner according to claim 1 or 2 provided in a door.


The air conditioner according to claim 9, wherein the auxiliary internal air introduction port (38) is located inside the virtual extension column (CL) when the internal air intake port (32B; 32C) is closed.


The air conditioner according to any one of claims 1 to 10, wherein a valve (39) for opening and closing the auxiliary internal air introduction port is provided at the auxiliary internal air introduction port (38).


The air conditioner according to claim 11, wherein the valve (39) is a reed valve that opens when a difference between the secondary pressure and the primary pressure becomes larger than a predetermined threshold.


The air conditioner according to any one of claims 1 to 10, wherein no valve is provided at the auxiliary inside air introduction port (38), and the auxiliary inside air introduction port is always open.

Images