JP5569072B2 - Ventilation unit for vehicle air conditioner - Google Patents

Description

  The present invention relates to a ventilation unit having a space in which a filter element can be stored in a vehicle air conditioner that air-conditions air in a vehicle interior of the vehicle.

  Conventionally, the ventilation unit of the vehicle air conditioner described in Patent Document 1 is known. FIG. 7 is a perspective view of a filter element stored in a conventional holding frame with a ventilation resistance plate according to Patent Document 1. FIG. As shown in FIG. 7, there is a holding frame 50 for storing the filter element 20 in the ventilation unit, and the ventilation resistance plate 25 is molded integrally with the holding frame 50 so as to be cut off. Specifically, as shown in FIG. 7, a filter assembly is constituted by the filter element 20 and a holding frame 50 that holds the filter element 20 and fixes it in the ventilation path.

  The holding frame 50 includes a removable ventilation resistance plate 25 having a ventilation resistance equivalent to that of the filter element 20. In the case of a specification with a filter, the ventilation resistance plate 25 is cut from the holding frame 50 with a nipper or the like, and the filter element 20 is attached to the holding frame 50 and mounted in the air conditioning duct.

  In the case of the specification without a filter, the holding frame 50 is mounted in the ventilation passage with the ventilation resistance plate 25 attached to the holding frame 50. For this reason, when changing from the specification without a filter to the specification with a filter, the ventilation resistance plate 25 may be removed from the holding frame 50 and the filter element 20 may be attached. Further, since the ventilation resistance does not change even if the specification is changed, it is possible to prevent a problem caused by the change in the ventilation resistance.

  The ventilation resistance plate 25 is integrally molded with resin together with the holding frame 50. In the specification with a filter, the ventilation resistance plate 25 is cut out from the holding frame 50 and the filter element 20 is fitted into the holding frame 50 for use.

JP 2000-264056 A

  According to the technique disclosed in Patent Document 1, a holding frame for attaching a ventilation resistance plate, which is a separate component, is required, which increases the number of components and increases the cost. In addition, when changing from a filter-free specification to a filter-equipped specification, the work cost is increased because it is an operation of removing the ventilation resistance plate with a nipper after removing the holding frame from the vehicle.

  The present invention has been made paying attention to such problems existing in the prior art, and the object thereof is to deal with a specification with a filter and a specification without a filter in a ventilation unit of a vehicle air conditioner. The object is to reduce the work cost and the number of parts when installing the ventilation resistance plate.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

In order to achieve the above object, the present invention employs the following technical means. That is, in the first aspect of the present invention, two types are selected: a specification with a filter in which a filter element (20) is arranged and a specification without a filter in which a filter element (20) is not arranged in a ventilation path through which introduced air flows. A ventilation unit (21) of a vehicle air conditioner configured to be able to take in introduced air from an outside air inlet (3) for taking in introduced air from outside air into the ventilation path and from inside air which is air from the inside of the vehicle. It has an inside / outside air switching box (6) having an inside air inlet (4), and a filter element (20) is disposed downstream of the outside air inlet (3) or the inside air inlet (4) in the flow of wind. A cutout having a possible space (20a) and having a ventilation resistance equivalent to that of the filter element (20) molded integrally with the inner edge of the outside air inlet (3) or the inner edge of the inner air inlet (4) The inside / outside air switching box (6) includes a fan (8a) that sucks air from the outside air inlet (3) or the inside air inlet (4). The ventilation resistance plate (25) is provided on the downstream side of the wind flow of the inlet (4), and is formed adjacent to the inner edge portion of the outside air inlet (3) or the inner air inlet (4) on the side close to the fan (8a). The suction opening (27) opened is formed between the edge portion far from the fan (8a) and the ventilation resistance plate (25).

In this invention, the ventilation resistance plate (25) that can be cut off is integrated into the outside air inlet (3) or the inside air inlet (4), which is an existing part of the ventilation unit (21) of the vehicle air conditioner (1). As a molded product, the filter element (20) can be arranged in the space (20a) downstream of the air flow at the outside air inlet (3) or the inside air inlet (4) of the inside / outside air switching box (6). Therefore, there is no need for a filter support frame integrally formed with the ventilation resistance plate for forming the cutable ventilation resistance plate (25), and the filter support frame is inexpensive or no filter support frame. But it can be configured. Further, since the outside air inlet (3) and the inside air inlet (4) are open to the outside, the ventilation resistance plate (25) can be easily cut from the outside. Further, a ventilation resistance plate (25) is formed adjacent to the edge portion on the side close to the fan (8a), and the suction opening opened between the edge portion on the side far from the fan (8a) and the ventilation resistance plate 25. Since the opening (27) is formed, wind with a high flow velocity flows through the suction opening (27), and wind with a relatively low flow velocity flows while being blocked by the ventilation resistance plate (25). The generation of noise due to the like can be suppressed.

In the invention described in claim 2 , the inside / outside air switching box (6) has the outside air inlet (3) or the inside air inlet (4) in the top direction, has the fan (8a) in the ground direction, and has ventilation. The resistance plate (25) is formed adjacent to the edge portion on the ground side of the outside air intake port (3) or the inside air intake port (4), and the edge portion on the heaven direction side and the ventilation resistance far from the fan (8a). An open suction opening (27) is formed between the plate (25) and the plate (25).

  In the present invention, when the ventilation resistance plate (25) is cut off, the ventilation resistance plate (25) is formed adjacent to the edge portion on the ground side of the outside air intake (3) or the inside air intake (4). In other words, since it is provided on the lower side, the cutting work can be easily performed.

In the invention according to claim 3 , the ventilation resistance plate (25) is provided with a convex portion (28) or a concave portion (40) for holding the ventilation resistance plate (25) in order to prevent the ventilation resistance plate (25) from falling after being cut off. It is characterized by having.

  In the present invention, the cut ventilation resistance plate (25) can be prevented from falling into the inside / outside air switching box (6) by the convex portion (28) or the concave portion (40), so that the working efficiency can be improved. it can.

In the invention according to claim 4 , the convex portion (28) or the concave portion (40) includes a handle (28) integrally formed with a ventilation resistance plate (25) that can be pinched with a finger, a groove portion (40a, 40b), It consists of any one of the holes.

  In this invention, the part for holding | maintaining a ventilation resistance board (25) can be comprised from either a handle (28), a groove part (40a, 40b), or a hole.

In the invention of claim 5, wherein, in inner outside air switching box air conditioning duct provided downstream of the air flow than the (6) (12), cooling air and heating air conditioning means (9, 10, 13) And a face air outlet (14) that blows out conditioned air toward the upper body of the passenger in the passenger compartment, and a foot air outlet (15) that blows out air conditioned air toward the passenger's feet. ) And the inside air inlet (4) , the ventilation resistance plate (25) is formed only in the inside air inlet (4).

  In the present invention, the following points are taken into consideration. That is, in the vehicle air conditioner (1), the conditioned air passing from the face air outlet (14) through the inside air inlet (4) when the air is very hot in summer has a low ventilation resistance in the air conditioning duct (12). In many cases, the airflow is relatively high. On the other hand, when it is not so hot, the conditioned air passing through the foot outlet (15) and the like and passing through the outside air intake (3) passes through the ventilation duct having a large ventilation resistance and is relatively air-flowed in the air-conditioning duct (12). Often flows in a small state.

  That is, there are many cases where the amount of air flow through the inside air intake (4) is larger than that through the outside air intake (3). Therefore, in the present invention, the outside air intake port (3) and the inside air inlet port (4) are considered to be used at the maximum air velocity at the maximum air flow rate (4). Since the ventilation resistance plate (25) is formed only on the inside air intake (4) that is sometimes used, the ventilation resistance action is greatly exerted, and the outside air intake (3) and the inside air intake (4 ) And the ventilation resistance plate (25) are formed on both sides, the manufacturing cost can be reduced.

  In addition, the code | symbol in parentheses described in a claim and each said means is an example which shows the correspondence with the specific means as described in embodiment mentioned later easily, and limits the content of invention is not.

It is a front view of the ventilation unit of the vehicle air conditioner in 1st Embodiment of this invention. It is a left view of the ventilation unit of the vehicle air conditioner in the said embodiment. It is a right view which shows the state which couple | bonded the blower unit with the said ventilation unit in the said embodiment. It is the schematic diagram which showed the internal structure of the vehicle air conditioner in the said embodiment. It is a perspective view of the ventilation unit of the vehicle air conditioner which shows 2nd Embodiment of this invention. It is a partial expansion perspective view of one segment of the ventilation resistance board in the ventilation unit which shows 3rd Embodiment of this invention. It is a perspective view of the filter element stored in the conventional holding frame with a ventilation resistance board.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration.

  Not only combinations of parts that clearly show that combinations are possible in each embodiment, but also a combination of the embodiments even if they are not clearly shown unless there is a problem with the combination. It is also possible.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4. FIG. 1 is a front view of a ventilation unit of a vehicle air conditioner, and FIG. 2 is a left side view. FIG. 3 is a right side view showing a state where the blower unit is coupled to the ventilation unit. FIG. 4 is a schematic diagram showing the internal configuration of the vehicle air conditioner according to the first embodiment.

  First, the overall configuration will be described with reference to FIG. 4 which is a schematic diagram of a vehicle air conditioner. The vehicle air conditioner 1 according to the first embodiment includes an air conditioning case 2 and air outlet ducts that connect the air conditioning case 2 and the vehicle interior outlet. The air conditioning case 2 includes a plurality of case members, and is a resin molded product such as polypropylene, for example.

  The air-conditioning case 2 is disposed downstream of the blower 8, an inside / outside air switching box 6 for taking in outside air or inside air in a switchable manner, a blower 8 for blowing the air inside or outside the vehicle interior to the evaporator 9 and the following. Various air conditioning unit components are provided in order from the upstream.

  The inside / outside air switching box 6 and the blower 8 are provided on the back side of the instrument panel in the front part of the passenger compartment and at a position closer to the passenger seat from the center of the vehicle. Further, the air conditioning unit component is provided near the center of the vehicle on the back side of the instrument panel.

  In the inside / outside air switching box 6, an outside air inlet 3 as a first air inlet and an inside air inlet 4 as a second air inlet are opened, and these inlets are intake ports of the blower 8. Communicated with. The outside air intake 3 or the inside air intake 4 is connected to the outside of the vehicle or the vehicle interior by a duct as necessary. Inside the inside / outside air switching box 6, there is provided a rotary door 5 as an inside / outside air switching door that switches between opening and closing of the outside air inlet 3 and the inside air inlet 4.

  The rotary door 5 is disposed so as to be rotatable left and right about a rotation shaft 5c located on the opposite side of the air inlet of the blower 8.

  The blower 8 includes a centrifugal multiblade fan (sirocco fan) 8a and a motor 7 for driving the fan. The periphery of the centrifugal multiblade fan 8a is surrounded by a scroll casing. The blower outlet of the blower 8 is connected to the blower passage leading to the ventilation inlet of the evaporator 9 by a duct extending in the centrifugal direction of the centrifugal multiblade fan 8a.

  The air conditioning unit components arranged downstream of the blower 8 passed through the evaporator 9 provided so as to cross the entire blower passage, the heater core 10 that heats the air that has passed through the evaporator 9, and the evaporator 9. An air mix door 13 that adjusts the amount of air that passes through the heater core 10, a defroster blow amount adjustment door 17 a provided downstream of the air mix chamber, a face blow amount adjustment door 18, and a foot blow amount adjustment door 19. I have.

  The evaporator 9 evaporates the low-temperature and low-pressure refrigerant decompressed by the expansion valve in the refrigeration cycle (not shown) by receiving the air from the blower 8, and cools the blown air passing around the tube through which the refrigerant flows. To do.

  The heater core 10 heats the blown air using the high-temperature cooling water of the traveling engine 11 as a heat source, and is arranged so as to partially block the passage on the downstream side of the air flow from the evaporator 9.

  The air mix door 13 is a one-side pivotal plate-like door provided downstream of the evaporator 9 and adjusts the ratio of the amount of air passing through the heater core 10 and the amount of air bypassing the heater core 10. . By controlling the opening degree of the air mix door 13, the amount of air heated by the heater core 10 out of the amount of air cooled by the evaporator 9 is adjusted, and these air are mixed in the air mix chamber so Temperature is adjusted.

  And the air-conditioning means which cools and heats the air in the air-conditioning duct 12 with the evaporator 9, the heater core 10, and the air mix door 13 formed in the air-conditioning duct 12 in the downstream of the air flow of the inside / outside air switching box 6 Is formed.

  The air mix chamber is a space in which the air flowing from the evaporator 9 and the air heated by the heater core 10 are mixed, and communicates with the defroster outlet 17, the face outlet 14, and the foot outlet 15 on the downstream side. ing.

  The conditioned air whose temperature is adjusted in this space is controlled by controlling the opening degree of each mode outlet such as the defroster outlet adjustment door 17a, the face outlet adjustment door 18 and the foot outlet adjustment door 19 to obtain an appropriate air volume ratio. Is supplied to the passenger compartment.

  The defroster outlet 17 is an opening for blowing out the conditioned air along the front window glass, and the degree of fogging of the front window glass is reduced by blowing out the conditioned air.

  The face air outlet 14 communicates with a vehicle interior face air outlet facing the vehicle interior by a connected face air outlet duct (not shown). The vehicle interior face outlet is an opening for blowing conditioned air toward the upper body of the occupant, and is mainly used during cooling.

  The foot air outlet 15 communicates with a vehicle interior foot air outlet (not shown) facing the vehicle interior by a connected foot air outlet duct (not shown). The vehicle interior foot outlet is an opening for blowing air-conditioned air to the feet of front and rear passengers, and is mainly used during heating.

  The ECU 16 includes temperature setting means for setting the temperature inside the vehicle interior, an inside air temperature sensor that detects the temperature inside the vehicle interior, an outside temperature sensor that detects the temperature of the outside air, a solar radiation sensor that detects the amount of solar radiation in the vehicle interior, and the evaporator 9. Signals from various sensors such as a temperature sensor that detects the downstream temperature and a water temperature sensor that detects the coolant temperature of the engine 11 are input.

  The ECU 16 executes a predetermined control program based on input signals from various sensors, and rotates the rotary door 5, the blower 8, the air mix door 13, the defroster blowout amount adjustment door 17 a, the face blowout amount adjustment door 18, and the foot The servo motor etc. which drive each door, such as the blowing amount adjustment door 19, are controlled.

  Next, the operation of the air conditioner will be described. When the ECU 16 controls the opening degree of the rotary door 5 that is the inside / outside air switching door and operates the blower 8 in order to take in the inside air, the rotary door 5 rotates counterclockwise in FIG. Occlude.

  When the summer is very hot, the inside air mode side that closes the outside air inlet 3 is selected in this way, the air mix door 13 is driven, the heater core 10 is closed, and the evaporator 9 is turned on as indicated by the broken line in FIG. In many cases, the cooled air that has passed through the air blows air from the face air outlet 14 toward the upper body of the occupant. Control of the air mix door 13 and the like at this time is referred to as MAX-COOL control.

  Conversely, when it is very cold in winter, the inside air mode side is selected, the air mix door 13 is driven, the air mix door 13 is fixed at a position where all the wind passes through the heater core 10, and the air passes through the heater core 10. The warmed air often blows conditioned air from the foot outlet 15 to the feet of the passengers. The control of the air mix door 13 and the like at this time is called “Max hot (MAX-HOT) control”.

  And the inside air taken in from the inside of the vehicle passes through the inside air inlet 4, flows inside the inside / outside air switching box 6, and in the specifications with a filter, flows in the space 20 a in which the filter element 20 is accommodated, and the inlet 8 b of the blower 8. Then, the air is blown out radially outward of the centrifugal multiblade fan 8a and blown to the air conditioning unit component side in the air conditioning case 2.

On the other hand, when the ECU 16 controls the opening degree of the rotary door 5 in order to take in outside air and operates the blower 8, the rotary door 5 rotates clockwise in FIG. 4 and closes the inside air intake 4.

  The outside air taken in from the outside of the vehicle passes through the outside air intake 3, passes through the space 20 a in which the filter element 20 is stored in the inside / outside air switching box 6, is sucked into the suction port 8 b of the blower 8, and is centrifuged. The air is blown outward in the radial direction of the blade fan 8 a and is blown to the air conditioning unit component side in the air conditioning case 2.

  Next, the ventilation unit 21 of FIG. 4 will be described based on FIGS. 1 to 3. The ventilation unit 21 can be selected from two types, a filter-equipped specification in which a filter element is arranged and a filter-free specification in which the filter element 20 is not arranged in a ventilation path through which the introduced air flows.

  In FIG. 1, reference numeral 22 denotes a filter mounting opening for inserting a filter element, and has a space 20 a into which the filter element 20 is inserted at the back of the filter mounting opening 22. The filter element 20 may be a single filter member, and may or may not have a filter holding frame for holding the filter member.

  As shown in FIG. 2, the ventilation path has an inside / outside air switching box 6 having an outside air inlet 3 for taking in introduced air from outside air and an inside air inlet 4 for taking in introduced air from inside air, which is air from the interior of the vehicle. Have. In the specification with a filter, the filter element 20 is disposed in a space 20 a downstream of the air flow at the outside air inlet 3 or the inside air inlet 4 of the inside / outside air switching box 6. 6a is a reinforcing rib, and may be omitted.

  As shown in FIG. 1, the inside air inlet 4 of the inside / outside air switching box 6 includes a cutable ventilation resistance plate 25 having a ventilation resistance equivalent to that of the filter element 20. The ventilation resistance plate 25 is integrally formed with the inside air inlet 4 of the inside / outside air switching box 6.

  That is, the inside air inlet 4 of the inside / outside air switching box 6 is a molded product of synthetic resin, and when this molded product is molded using a mold, the ventilation resistance plate 25 is connected to the inside air of the inside / outside air switching box 6. The inner edge of the intake 4 is bridged by a connecting portion 26 that can be cut off, and is integrally molded.

  As shown in FIG. 3, a centrifugal multiblade fan 8 a that sucks air from the outside air inlet 3 or the inside air inlet 4 is provided on the downstream side of the wind flow of the outside air inlet 3 and the inside air inlet 4. As shown in FIG. 1, the inner air inlet 4 is formed adjacent to the edge portion on the side close to the centrifugal multiblade fan 8a, that is, the lower edge of the inner air inlet 4 in FIG. As a result, an open suction opening 27 is formed between the edge portion far from the centrifugal multiblade fan 8 a and the ventilation resistance plate 25.

  In other words, the inside / outside air switching box 6 has the outside air inlet 3 or the inside air inlet 4 in the ceiling direction (upward in FIG. 1), and the centrifugal multiblade fan 8a in the ground direction (downward in FIG. The ventilation resistance plate 25 is formed adjacent to the edge portion on the ground side of the outside air inlet 3 or the inside air inlet 4 and is located on the edge portion on the sky side far from the centrifugal multiblade fan 8a. An open suction opening 27 is formed between the airflow resistance plate 25 and the airflow resistance plate 25.

  The ventilation resistance plate 25 is integrally formed with a handle (grip) 28 that forms a convex portion 28 for holding the ventilation resistance plate 25 in order to prevent the ventilation resistance plate 25 from dropping after being cut off. The handle 28 is composed of triangular protrusions that protrude perpendicularly to the plane of the segments of the ventilation resistance plate 25 formed one by one in the lattice frame 29 of the inside air inlet 4.

  The handle 28 can be pinched with a finger, and while holding the handle 28 with the left hand, the small-diameter connecting portion 26 that bridges between the segment of the ventilation resistance plate 25 and the lattice frame 29 is cut out with a nipper. Has been. A lattice frame 29 made of a lattice-like frame that crosses the opening portions of the outside air intake 3 and the inside air inlet 4 is molded integrally with the outside air inlet 3 and the inside air inlet 4 from a synthetic resin.

  The effect in the said structure is demonstrated. For the ventilation unit 21 of the vehicle air conditioner 1 of FIG. 4, the inside air inlet 4 of FIG. 1, which is an existing vehicle component, is provided with a ventilation resistance plate 25 that is a set of segments that can be cut out, and an inside / outside air switching box A filter element 20 can be disposed on the downstream side of the flow of wind at the internal air intake 4 of 6.

  Therefore, the filter holding frame integrally formed with the conventional ventilation resistance plate for forming the cutable ventilation resistance plate 25 is unnecessary, and the filter element 20 has a low cost or no filter holding frame. Can be configured. Further, since the inside air intake 4 is open to the outside, the ventilation resistance plate 25 can be easily cut out from the outside.

  The ventilation resistance plate 25 is integrally molded together with the inside air intake 4 of the inside / outside air switching box 6, and a cut-off connecting portion is integrally formed between the ventilation resistance plate 25 and the inside air inlet 4 of the inside / outside air switching box 6. Therefore, the manufacturing cost can be reduced and the number of parts can be reduced.

  Further, a ventilation resistance plate 25 is formed adjacent to an edge portion near the centrifugal multiblade fan 8a in the blower 8 of FIG. 3, and an edge portion far from the centrifugal multiblade fan 8a and the ventilation resistance plate 25 are formed. Since the opened suction opening 27 is formed therebetween, the wind having a high flow velocity flows through the suction opening 27 and the wind having a relatively low flow velocity flows while being blocked by the ventilation resistance plate 25. Therefore, the generation of noise can be suppressed.

  Further, when the ventilation resistance plate 25 is cut off, the ventilation resistance plate 25 is formed adjacent to the edge portion on the ground direction side of the inside air intake 4, in other words, because it is provided on the lower side. Easy to cut.

  And the ventilation resistance board 25 has the handle 28 integrally molded which can be pinched with a finger in order to hold | maintain one segment of the ventilation resistance board 25, in order to prevent the fall after cutting.

  By carrying out the cutting work by holding the handle 28, it is possible to prevent the cut segment of the ventilation resistance plate 25 from falling into the inside / outside air switching box 6, so that the working efficiency can be improved.

  Further, since the ventilation resistance plate 25 is composed of a group of a plurality of segments that can be cut off, the segments can be provided integrally in a lattice frame 29 that crosses the inside air inlet 4. Thereby, ventilation resistance can also be adjusted by cutting out a required number of segments.

  In the specification with a filter, the ventilation resistance plate 25 is cut out from the inside air inlet 4 and then the filter element 20 is inserted and attached from the filter attachment opening 22 of FIG. The filter element 20 only needs to have a shape that can hold the shape as the filter element 20, and there may be no strong holding frame integrated with the ventilation resistance plate as in the related art.

  In the first embodiment, the ventilation resistance plate 25 is formed only on the inside air inlet 4 out of the outside air inlet 3 and the inside air inlet 4. In the vehicle air conditioner 1 of FIG. 4, when the summer is very hot, the conditioned air passing through the inside air intake 4 from the face air outlet 14 flows through the air conditioning duct 12 through a path with low ventilation resistance. When it is not so hot, it is known that the conditioned air passing through the face air outlet 14 and the outside air inlet 3 flows through the air conditioning duct 12 through a route having a large ventilation resistance.

  That is, between the outside air inlet 3 and the inside air inlet 4, the inside air inlet 4 has a higher flow velocity of the conditioned air. Therefore, the ventilation resistance plate 25 is formed only in the direction of the inside air intake 4 where the flow velocity of the conditioned air is large, so that the ventilation resistance plate 25 is formed in both the outside air intake 3 and the inside air intake 4. The manufacturing cost can be reduced as compared with the case of doing so.

  In other words, the face mode in which the maximum voltage is applied to the centrifugal multiblade fan 8a to generate the maximum air volume is frequently used in the inside air mode in which the inside air intake 4 is opened. Further, the foot mode and the differential mode have a relatively small air volume and are frequently used in the outside air mode.

  In this 1st Embodiment, since the ventilation resistance board 25 is formed only in the direction of the internal air intake 4 with the large flow velocity of an air-conditioning wind, it can reduce cost. The effect of increasing the pressure loss by the ventilation resistance plate 25 is greater when the ventilation resistance plate 25 is formed toward the inside air intake 4 where the flow velocity of the conditioned air is larger.

  On the other hand, there is no ventilation resistance plate 25 in the outside air inlet 3, but the air volume is relatively small in the outside air mode. Accordingly, there is no effect of increasing pressure loss by the ventilation resistance plate 25 due to the absence of the ventilation resistance plate 25. However, since the air volume is originally small, there is no significant demerit even without the ventilation resistance plate 25.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described.

  FIG. 5 is a perspective view of the ventilation unit 21 of the vehicle air conditioner 1 (FIG. 4) showing the second embodiment of the present invention. In FIG. 5, the ventilation resistance plate 25 is integrally formed with the inside air intake 4 of the inside / outside air switching box 6, and the space between the ventilation resistance plate 25 and the inside edge of the inside air inlet 4 of the inside / outside air switching box 6 is integrally formed. It is bridged by a small connecting portion 26 that can be cut off.

  Further, the lattice frame 29 at the edge portion near the centrifugal multiblade fan 8a has a fully closed portion 31 that is fully closed. A ventilation resistance plate 25 made of a set of segments is formed adjacent to the fully closed portion 31. In addition, an open suction opening 27 is formed between the edge portion on the side far from the centrifugal multiblade fan 8 a and the ventilation resistance plate 25.

  Thereby, since the wind with a large flow velocity flows through the suction opening 27 and the wind with a relatively small flow velocity flows through the ventilation resistance plate 25, generation of noise can be suppressed. The portion of the ventilation resistance plate 25 that does not need to be cut is formed as a fully closed portion 31 by a resin molded product that is integral with the lattice frame 29 that crosses the inside air inlet 4 of the inside / outside air switching box 6.

  In the specification with a filter, the ventilation resistance plate 25 is cut out from the inside air intake 4, and then the filter element 20 is inserted and attached from the filter attachment opening 22 of FIG. 5. The filter element 20 only needs to hold the shape as the filter element 20, and a holding frame integrated with a conventional ventilation resistance plate is not necessary.

  As described above, in the first embodiment and the second embodiment, only the inside air inlet 4 of the inside / outside air switching box 6 is closed with the ventilation resistance plate 25, so that the vehicle is provided with the ventilation unit 21 (or the ventilation unit 21 and the ventilation unit 21). Since the ventilation resistance plate 25 can be cut out while the blower unit 21a) of FIG. 3 is mounted, it is possible to save the trouble of lowering the ventilation unit 21 from the vehicle. Incidentally, when the ventilation resistance plate 25 is attached to the outside air inlet 3, the cutting operation cannot be performed unless the ventilation unit 21 is once lowered from the vehicle.

  In addition, even when the ventilation resistance plate 25 is provided only in the inside air intake port 4 in this way, the face mode that may produce the maximum air volume (MAX air volume) is frequently used in the inside air mode, and therefore the ventilation resistance. The effect of the plate 25 is easily exhibited.

  On the other hand, the foot mode and the differential mode are frequently used in the outside air mode, but in this case, the air volume is small due to the influence of the ventilation resistance of the ventilation path such as the air conditioning duct 12 of FIG. There are few disadvantages due to the lack of a draft resistance plate.

(Third embodiment)
Next, a third embodiment of the present invention will be described. Features different from the above-described embodiment will be described. FIG. 6 is a partially enlarged perspective view of one segment of the ventilation resistance plate 25 in the ventilation unit showing the third embodiment.

  In FIG. 6, one segment of the ventilation resistance plate 25 is formed with a pair of groove portions 40 a and 40 b that become the recesses 40. A finger or a dedicated tool is hooked on the groove portions 40a and 40b to hold the ventilation resistance plate 25 so that the segment of the ventilation resistance plate 25 does not fall, and the small-diameter connecting portion 26 as a bridging portion is cut off with a nipper or the like.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in the above-described embodiment, the ventilation resistance plate 25 is provided only in the inside air intake 4, but the ventilation resistance plate 25 is formed only in the outside air intake 3 or both the inside air intake 4 and the outside air intake 3. May be.

  Further, the ventilation resistance plate 25 has a convex portion or a concave portion for holding the ventilation resistance plate 25 in order to prevent the fall after being cut off. In the case of the concave portion, it is formed by a groove portion as shown in FIG. It may also be formed by a hole.

  In the case of such a recess, the effect of blocking the wind as the ventilation resistance plate 25 is partially impaired, but if a tweezer-shaped or hook-shaped dedicated tool is used, there is no need to pass the finger into the recess, so the groove And the diameter of the hole can be reduced.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 3 Outside air inlet 4 Inside air inlet 6 Inside / outside air switching box 8a Fan 9, 10, 13 Air conditioning means 12 Air conditioning duct 14 Face outlet 15 Foot outlet 20 Filter element 20a Space 21 Ventilation unit 25 Ventilation resistance plate 26 connecting portion 27 suction opening 28 convex portion, handle 29 lattice frame 40 concave portion 40a, 40b groove portion

Claims (5)

Ventilation of a vehicle air conditioner in which two types of specifications, a filter with a filter element (20) and a filter without a filter element (20), can be selected in the ventilation path through which the introduced air flows. A unit (21),
An inside / outside air switching box (6) having an outside air inlet (3) for taking in the introduced air from outside air and an inside air inlet (4) for taking in the introduced air from inside air, which is air from the interior of the vehicle, in the ventilation path. )
A space (20a) in which the filter element (20) can be disposed on the downstream side of the wind flow from the outside air inlet (3) or the inside air inlet (4);
A cutable ventilation resistance plate (25) having a ventilation resistance equivalent to that of the filter element (20) molded integrally with the inner edge of the outside air inlet (3) or the inner edge of the inner air inlet (4). Prepared,
The inside / outside air switching box (6) has a fan (8a) for sucking air from the outside air inlet (3) or the inside air inlet (4) of the outside air inlet (3) or the inside air inlet (4). With the wind flow downstream,
The ventilation resistance plate (25) is formed adjacent to an inner edge portion of the outside air inlet (3) or the inside air inlet (4) on the side close to the fan (8a), and is far from the fan (8a). A ventilating unit for a vehicle air conditioner, wherein an open suction opening (27) is formed between a side edge portion and the ventilation resistance plate (25). The inside / outside air switching box (6) has the outside air inlet (3) or the inside air inlet (4) in the top direction, and has the fan (8a) in the ground direction,
The ventilation resistance plate (25) is formed adjacent to the edge portion on the ground side of the outside air inlet (3) or the inside air inlet (4), and is located on the ceiling side far from the fan (8a). The ventilation unit of the vehicle air conditioner according to claim 1 , wherein an open suction opening (27) is formed between an edge portion and the ventilation resistance plate (25). The said ventilation resistance board (25) has a convex part (28) or a recessed part (40) for hold | maintaining the said ventilation resistance board (25), in order to prevent the fall after cutting. Item 3. A ventilation unit for a vehicle air conditioner according to item 1 or 2 . The convex part (28) or the concave part (40) is one of a handle (28), a groove part (40a, 40b) and a hole part integrally formed with the ventilation resistance plate (25) which can be pinched with a finger. The ventilation unit of the vehicle air conditioner according to claim 3 , wherein The air conditioning duct (12) provided on the downstream side of the air flow from the inside / outside air switching box (6) has air conditioning means (9, 10, 13) for cooling and heating the air, A face outlet (14) for blowing out the conditioned air in the upper body direction of the occupant, and a foot outlet (15) for blowing out the conditioned air at the occupant's feet,
The said ventilation resistance board (25) is formed only in the direction of the said internal air intake (4) among the said external air intake (3) and the said internal air intake (4), The 1st aspect is characterized by the above-mentioned. The ventilation unit of the vehicle air conditioner as described in any one of thru | or 4 .

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