JP3489034B2 - Car cab ventilation system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation system for an automobile cab, and more particularly to a casing having an outside air intake, a recirculation air intake and an exhaust for exhausting air into the cab, a fan mounted in the casing, BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation device that includes a regulating valve that partially closes an outside air intake and a distribution means that selectively closes the outside air intake and the recirculation air intake in response to a traveling speed of a vehicle.

[0002]

2. Description of the Related Art In a conventional apparatus of this type, air is supplied into the casing from the outside and the cab through an outside air intake and a recirculation air intake, respectively. The air sent into the casing is delivered from the exhaust port of the casing into the cab by the fan. The exhaust is typically coupled to a heating or air conditioning system that processes the air prior to its final delivery into the cab.

The regulating valve closes the outside air intake port in response to the speed of the vehicle so as to regulate a certain amount of air to flow into the cab regardless of the actual traveling speed. This ensures that external aerodynamic pressure conditions that vary with vehicle speed do not interfere with fan operation.

In the known arrangement, the regulating valve is actuated by a motor device which is responsive to the speed of the vehicle and closes the ambient air intake to some extent rather than completely. It is the distribution means that completely closes the outside air intake. Conventional dispensing means are usually of the axial rotating type and include a dispensing valve adapted to selectively close the ambient air inlet and the recirculation air inlet. When the outside air intake is closed, the recirculation air intake is open, the device operates in " recirculation ventilation mode ", when the outside air intake is closed, the outside air intake is open, Device is "outside air ventilation mode "
In to operate.

[0005]

These conventional configurations are
The need for two separate valves, a flow control valve and a distribution valve, has the disadvantage of making the controller large and complex. The object of the invention is to overcome the abovementioned drawbacks.

[0006]

Therefore, a vehicle driver's cab ventilation apparatus according to the present invention comprises: (a) a casing having an outside air intake port, a recirculation air intake port, and an exhaust port for exhausting air to the cab, (b) A fan mounted in the casing, (c) a control valve that responds to the running speed of the vehicle and partially blocks the outside air intake, and (d) is attached to the recirculation air intake. ,
Air pressure according to the casing side in response to a differential pressure is lower than the air pressure according to the driver's cab side, the flow rate adjustment <br/> grids comprise adjusting valve member to open when the control valve is completely closed And with recirculation ventilation mode, adjust
The valve is fully closed, the regulating valve member is opened, and the outside air ventilation mode is set.
The adjustment valve is fully opened or partially opened.
Recirculation ventilation mode and open air ventilation mode with components closed.
Characterized by being operated in two different modes
That.

According to the present invention, the flow rate of air entering the cab can be adjusted and the operation mode can be selected by using only one valve, that is, the speed response adjusting valve provided at the outside air intake. Therefore, it is not necessary to provide the second valve for selecting the operation mode, which is required in the conventional device. The flow regulation grid provided at the recirculation air intake is much smaller than conventional pivot valves, but operates automatically without any special control means.

In a preferred embodiment of the device according to the invention, the grids provided at the recirculation air intake are each resilient toward an edge fixed to the grid and a first valve seat defining a closed position. A plurality of regulating valve members having a flexible plate adapted to move toward a second valve seat defining an open position and having oppositely opposed free edges.

According to another preferred embodiment of the invention, each regulating valve member is directed inside the casing in the open position.

Preferably, each adjusting valve member is in the shape of a free plate made of a reinforcing elastic material.

According to a preferred feature of the invention, the regulating valve is
A valve member is provided that axially moves between a fully open position and a fully closed position by rotating about one quarter.

According to another preferred characteristic of the invention, the device comprises a control means acting on the movement of the regulating valve, a first input line for inputting an electrical signal representative of the traveling speed of the vehicle, a desired recirculation air flow rate. A second input line for inputting an electric signal indicating the second input line, and a second input line for receiving a signal from the first input line or the second input line,
By issuing an output signal which is a function of the vehicle speed when the input line does not receive the signal and applying it to the control means, the second input line causes the second input line to generate a signal representative of the demand for the recirculated air flow rate. Processing means are included to enable the output valve to close the regulating valve when received.

The control means of the regulating valve preferably includes linear servo means.

According to yet another preferred feature of the invention:
The casing has a first casing portion that defines an outside air intake and a recirculation air inlet, and a first casing portion that is joined to the first casing portion to define an exhaust port and that has a built-in fan. Is equipped with.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the accompanying drawings. The vehicle cab ventilation system shown in FIG.
A casing (10) including a first casing body (12) and a second casing body (14) is provided. First casing body (12)
Is constructed by assembling two parts (12a) and (12b).

The casing portion (12a) of the casing body (12) is provided with an outside air intake (16) for supplying air from the outside of the vehicle cab (H), and the cab (H). The second casing part (12b) has a recirculation air intake port (18) so as to draw the recirculation air into the inside. Intake
(16) and (18) are respectively formed inside the casing body (12) and communicate with the casing body (14) with a common outlet duct (2
Exhaust to the two ducts (20) (22) leading to 4). However, the outside air intake port (16) is provided with a regulating valve (26) having a valve member pivotally attached ( perpendicular to the plane of FIG. 1) about the rotation shaft (28). By rotating the valve member (26) by a quarter turn, the valve member (26) can pivot between the fully open position shown in FIG. 1 and the fully closed position shown in FIG. On the other hand, the recirculation air intake port (18) will be described in detail later, and as shown in FIG.
A flow adjustment grid (30) is provided at the closed position to indicate the closed position.

The casing body (12) has a casing portion (12a).
It has a fastening lug (32) projecting from it for fixing the casing to the element (C) of the vehicle body.

The casing body (14), like the casing body (12), also comprises two assembled parts (14a) and (14b). One casing part (14a) is fixed to the casing part (12a) with a screw (34). The other casing part (14b) is the outlet duct (24) of the casing area (12).
It defines an entrance (36) that directly communicates with. The inlet (36) has a substantially circular shape, and is arranged around an axis (XX) extending in a direction generally orthogonal to the rotation axis of the regulating valve member (26).

The casing body (14) is driven by the electric motor (40) and the electric motor (40), and the inlet (36) is also provided.
Has an electric fan device (38) composed of a fan (42) adjacent to. The axis line (XX) is a rotation axis of the electric motor (40) and the fan (42).

The electric motor (40) is supported by a support member (44) fixed to the casing portion (14b) by a screw (46). The casing body (14) defines an inner volute portion (47) communicating with the outlet duct (48). Outlet duct (48)
Via the appropriate air treatment device (not shown)
It ends at the exhaust port (50) that opens to (H). for that reason,
The air introduced into the casing from the outside air intake port or the recirculation air intake port can be delivered to the cab through the exhaust port (50).

As best shown in FIG. 2, the casing portion
The grid (30) arranged in (12b) is provided with a large number of holes (52), each of which is provided with a regulating valve member (54) and has a substantially rectangular shape. In this example, each valve member (54) has a corresponding hole.
It is in the shape of a generally rectangular flexible plate that fits with (52). Each swivel plate has a rim (5) fixed to the grid (30).
6) and an opposite free edge (58), the latter elastically biased towards the first peripheral valve seat (60) defining the closed position of the free plate. The free plate is the second that defines its open position.
It can move towards the valve seat (62). In the rest position (shown in solid lines in FIG. 2), each regulating valve member (54) has a corresponding first
It is elastically pushed towards the valve seat (60) and closes the corresponding hole (52).

Casing or grid duct (22)
When the pressure applied to the same side as the pressure becomes equal to or lower than the pressure applied to the grid side corresponding to the operator's cab, the regulating valve member (54) moves toward the open position shown by the broken line in FIG. 2, that is, the corresponding second valve seat. Attempt to move towards (62). Therefore, the air discharged from the cab (H) can flow into the casing through the recirculation air intake port (30) and the duct (22). Figure 2
At, each valve member (54) is directed inside the casing (10) when in the open position.

In the preferred embodiment of the present invention, since each adjusting valve member is composed of a flexible plate made of a reinforcing elastic material, appropriate elastic characteristics and flexibility can be obtained.

As described above, the regulating valve (26) shown in FIG. 1 can move axially between the fully open position shown in FIG. 1 and the fully closed position shown in FIG. 4, and, for example, as shown in FIG. It is also possible to take a desired intermediate position.

The ventilator can operate in two different modes, a recirculation ventilation mode and an open air ventilation mode. In the recirculation ventilation mode, the regulating valve (26) is fully closed, but the regulating valve member (54) is opened (see FIG. 4). On the other hand, in the outside air ventilation mode, the regulating valve (26) is in a fully opened state (shown in FIG. 1) or a partially opened state (shown in FIG. 3), and the regulating valve member (54) is closed.

Next, the control system of the regulating valve (26) will be described with reference to FIG. The valve (26) is controlled by control means, generally indicated by the numeral (66) in FIG. In this example, the control means (66) is composed of a known linear servo means,
It has a position response device (70) and an actuator (68) coupled to a differential device (72) that adjusts the actual measurement value to the desired value by measuring the difference between the desired value and the actual measurement value. .

The device further comprises a first electrical input line (74) for receiving a signal representative of the running speed of the vehicle, a second electrical input line (76) for receiving a signal representative of the desired amount of recirculated air, and a first electrical input line (76). It has a signal processor (78) which receives signals from the first input line (74) near the two input lines (76). The signal output from the signal processor (78) is applied to the differential device (72). The signal processor (78) operates such that if the second input line (76) does not receive a signal representative of the desired recirculation airflow, its output signal will be a function of vehicle speed. The signal from the processor (78) is the control valve.
Controlling (26) causes the second input line (76) to move it to the closed position when it receives a signal representative of the desired recirculation air flow rate.

The device operates in the following manner. In outside air ventilation mode, the processor (78) receives an input signal representing the speed of the vehicle and processes this signal according to an algorithm defined to move the regulating valve (26) to the fully open or partially open position. The flow rate of the air introduced into the cab from the outside air intake (16) can be adjusted as a function of the vehicle speed. First, the algorithm given by the processor (78) is determined in consideration of the characteristics peculiar to the vehicle, so that regardless of the prevailing conditions such as the change in aerodynamic pressure due to the running speed of the vehicle, the fan The operating conditions are
It is almost always the same.

Further, in the outside air ventilation mode, the grid
(30) Since the predominant pressure in the downstream casing is larger than that in the operator's cab, the regulating valve member (54) closes by itself. Figure 1
In the fully open position shown in, the flow rate of the air passing through the outside air intake port (16) reaches the maximum amount as shown by the arrow (F1), and the outside air entering the casing is delivered to the outlet duct (48),
Then it is delivered to the cab.

Heating and / or air conditioning equipment, which properly processes the air prior to exhausting it into the operator's cab, is usually installed over the exhaust port (50).

In the recirculation air ventilation mode, the processor (78) (see FIG. 5) receives a signal on input line (76) representative of the desired amount of recirculation of air, avoiding the use of the algorithm. Let As a result, the regulating valve (26) is automatically moved by the actuator (68) toward the fully closed position (FIG. 4). In this mode, when the predominant pressure in the casing drops below that in the cab, the regulating valve member (54) will automatically open and allow air to enter as indicated by arrow (F2) in FIG.

[0032]

According to the device of the present invention, it is not necessary to provide a distribution valve, which is required in the conventional ventilation device, for selectively closing the outside air intake port or the recirculation air intake port.

[Brief description of drawings]

1 is a cross-sectional view of a ventilation device according to the invention, perpendicular to the pivot axis of the regulating valve and along a plane passing through the axis of the ventilation fan.

FIG. 2 is a cross-sectional view of a flow rate adjusting grid installed in a recirculation air intake of the apparatus shown in FIG.

3 is a partial view of FIG. 1 showing the regulating valve in two different positions.

4 is a partial view of FIG. 1 showing the regulating valve in two different positions.

FIG. 5 is a schematic diagram of adjusting valve control means.

[Explanation of symbols]

(10) Casing (12) First casing body (12a) (12b) First casing portion (14) Second casing body (14a) (14b) Second casing portion (16) Outside air intake (18) Recirculated air Inlet (20) (22) Duct (24) Common output duct (26) Regulator valve (28) Rotation axis (30) Flow rate adjustment grid (32) Fastening lug (34) Screw (36) Inlet (38) Electric fan unit (40) Electric motor (42) Fan (44) Support member (46) Screw (47) Volute part (48) Outlet duct (50) Exhaust port (52) Rectangular hole (54) Regulator valve member (56) (58) Edge (60) First peripheral valve seat (62) Second valve seat (66) Control means (68) Actuator (70) Position responder (72) Differential device (74) First input line (76) Second input Line (78) Signal processor (C) Element (F1) (F2) Arrow (H) Driver's cab (XX) Axis

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60H 1/00-1/24

Claims (8)

(57) [Claims] 1. A casing (10) having (a) an outside air intake (16), a recirculation air intake (18) and an exhaust port (50) for exhausting to a driver's cab (H), (b) a casing (10 ) (38) A fan (38) mounted inside (), (c) A regulator valve that responds to the running speed of the vehicle and partially blocks the outside air intake (16).
(26), (d) It is attached to the recirculation air intake (18),
In response to the differential pressure, the air pressure applied to the casing (10) side is lower than the air pressure applied to the cab side, and the adjustment valve member (54) that is opened when the adjustment valve (26) is completely closed is used. Equipped with a flow regulation grid (30) provided, in the recirculation ventilation mode, the regulation valve (26) is fully closed,
In the outside air ventilation mode, the member (54) is opened and the regulating valve (26)
Is fully opened or partially opened, and the adjusting valve member (54) is closed.
Two modes of recirculation ventilation and open air ventilation that are linked
Ventilation device characterized by being operated in different modes . 2. The grid (30) for the recirculation air intake (18)
Is fixed to the grid (56) and the opposite free edge (5) elastically biased towards the first valve seat (60) defining the closed position.
8) and has a second valve seat (62) that determines the open position.
A ventilator according to claim 1 including a plurality of regulating valve members (54) comprising flexible plates adapted to move towards. 3. Ventilation device according to claim 2, characterized in that each regulating valve member (54) is adapted to face the inside of the casing (10) in the open position. 4. The adjusting valve member (54) is provided with a flexible plate made of a reinforcing elastic material.
Ventilator by. 5. The adjusting valve (26) is provided with a valve member which is rotated and displaced between a fully open position and a fully closed position by rotating about 1/4. A ventilation device according to any one of items 1 to 4. 6. A control means (66) which acts on the movement of the regulating valve (26), a first electric input line (7) for a signal representing a vehicle traveling speed.
4), a second electrical input line (7) for a signal representing the desired recirculated air flow rate.
6), by receiving a signal from the first input line (74) or the second input line (76), emitting an output signal and applying the output signal to the control means (66), the second input line (76) ) Does not receive a signal, the output signal is emitted as a function of vehicle speed, so that when the second input line (76) receives a signal representing the desired recirculation air flow rate, the regulating valve The ventilation device according to any one of claims 1 to 5, further comprising a processing means (78) adapted to close the. 7. The control means (66) is a linear servo means (68).
Ventilation device according to claim 6, characterized in that it comprises (70). 8. The casing (10) has an outside air intake (16).
A second casing having a built-in fan (38), which is joined to the first casing part (12) to define an exhaust port (50) and a first casing part that defines a recirculation air intake port (18). A casing part (14) is provided, and it is characterized by the above-mentioned.
Ventilation system by either.