JPH0722806U - Heater unit - Google Patents

Abstract

(57) [Summary] [Purpose] When the air mix door that completely blocked the cold air passage slightly opens the cold air passage to shift from full hot mode to a little cool mode, or When the air mix door that was completely blocked slightly opens the hot air passage to shift from full cool mode to a little hot mode, air leaks from the gap between the air mix door and the heater case, and a large amount of air leaks. The air is suppressed from flowing into the cold air passage or the hot air passage and the temperature of the blown air is suddenly increased or decreased. [Constitution] Heater case 2 having an air intake 3 formed therein
A heater core 4 for heating the air sucked in through the air intake 3, and a rotary shaft 6 spanning the heater case.
And an air mix door 5 which is pivotally supported by the air mix door and distributes the air passing through the heater core 4 and the air bypassing the heater core 4 by adjusting the opening degree. On the projection 3
0, 31, 32 are formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a heater unit that includes an air mix door, a heater core, and the like in a heater case, and controls the temperature of blown air by adjusting the opening of the air mix door.

[0002]

[Prior art]

 This type of heater unit adjusts the opening degree of the air mix door arranged in the heater case to allow the air cooled by the cooling unit to pass through the warm air passage having the heater core and cool air that bypasses the heater core. It is configured to distribute to the ones passing through the passages and then mix and control the temperature of the blown air.

When adjusting the opening degree of the air mix door, in order to prevent the operability of the air mix door from being reduced by friction due to the contact between the air mix door and the heater case, the conventional heater is used. A gap of about 3 mm was provided in the axial direction between the case and the air mix door.

[0004]

[Problems to be solved by the device]

 However, in the heater unit configured as described above, air flows into the warm air passage or the cold air passage through the gap between the heater case and the air mix door except when the air mix door completely closes the hot air passage or the cold air passage. To do.

Therefore, for example, even when the air mix door slightly opens the cool air passage from the state where the cold air passage is completely closed and the full hot mode is slightly shifted to the cool mode, the air flows in through the gap. The amount of air added to the opening of the air mix door causes a large amount of air to flow into the cold air passage, and the temperature change of the blown air does not change smoothly compared with the change of the opening of the air mix door, but drops sharply. Had the inconvenience of

On the contrary, for example, even when the warm air passage is slightly opened from the state in which the air mix door completely closes the warm air passage and the full cool mode is slightly shifted to the hot mode, For the same reason as above, a large amount of air will flow into the cold air passage, and the temperature change of the blown air will not change smoothly compared to the change of the opening degree of the air mix door, and it will also rise up rapidly. (Shown as a characteristic line in FIG. 10).

In view of the above problems, in the present invention, in spite of the above problems, the blowout is performed despite the shift from the full hot mode to the cool mode, and from the full cool mode to the hot mode. It is an object of the present invention to provide a heater unit capable of preventing the temperature change of air from rapidly rising or falling.

[0008]

[Means for Solving the Problems]

 Accordingly, the gist of the heater unit of the invention described in claim 1 is that a heater case is provided with an air inlet, a heater core for heating air sucked from the air inlet, and the heater case. The air mix door is rotatably supported by a rotating shaft and is configured to at least include an air mix door that distributes air passing through the heater core and air bypassing the heater core by adjusting the opening degree. The projection is formed at the end in the axial direction.

Further, the gist of a heater unit of the invention according to claim 2 is that a heater case having an air inlet is formed, and a heater core for heating air sucked from the air inlet. , An air mix door which is rotatably supported by a rotary shaft passed through the heater case and which is divided into air passing through the heater core and air bypassing the heater core by adjusting the opening degree. This is because a ridge was formed inward on the surface of the heater case on the axial end side of the door.

[0010]

Therefore, according to the first aspect of the present invention, the protrusion of the air mix door constantly makes contact with the heater case to eliminate a gap in the axial direction of the air mix door to prevent air leakage. Therefore, the above problems can be achieved.

According to the second aspect of the present invention, the protrusion of the heater case reduces the axial gap between the heater case and the air mix door, making it difficult for air to leak. It can be achieved.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

First, an embodiment of the present invention embodied in the air mix door 5 of the heater unit 1 will be described with reference to FIGS. 1 to 4.

The heater unit 1 includes a heater core 4 and an air mix door 5 described below, and is connected to a blower unit including a blower (not shown) and a cooling unit including an evaporator, for example, in a vehicle. Since it constitutes an air conditioner used, the air cooled by the cooling unit is introduced from the air intake 3 formed in the heater case 2. On the side of the heater case 2 opposite to the side where the heater core 4 is housed, a locking portion 15 extends inward from the heater case 2 in order to limit the opening of the air mix door 5 described below.

On the downstream side of the air intake 3, a warm air passage 10 provided with a heater core and a cold air passage 11 that bypasses the warm air passage 10 are branched. The heater core 4 recirculates the cooling water of the running engine to reheat the air cooled by the evaporator, and is arranged obliquely with respect to the air intake 3.

Further, following these passages 10 and 11, a mix chamber 20 for mixing the air passing through the warm air passage 10 and the air passing through the cool air passage 11 is arranged, and above the mix chamber 20. The vent outlet 21 and the defrost outlet 22 are opened, and the foot outlet 23 is opened in the lower downstream side. Each of the outlets 21 to 23 corresponds to each mode such as heat, defrost, and vent. Although not shown, a vent door, a defrost door, and a foot door that open and close these outlets 21 to 23 are rotatably attached.

With the above configuration, the air cooled by the evaporator is distributed by the air mix door 5 described below into one that flows into the warm air passage 10 and one that flows into the cold air passage 11, whereby the heater core 4 The reheated warm air and the cold air bypassing the heater core 4 are mixed in the mix chamber 20 and are blown out into the vehicle compartment after the air conditioning is controlled.

Further, although an opening 25 is formed next to the air intake 3 in FIG. 1, the opening 25 bypasses the heater core 4 separately from the warm air passage 10 and the cold air passage 11. Then, the air cooled by the evaporator is connected to a bypass passage for flowing into the mix chamber 20 or the vent outlet 21.

The air mix door 5 has a function of distributing the air flowing into the warm air passage 10 and the air flowing into the cold air passage 11 described above at a desired ratio. It is provided at the branch point.

The air mix door 5 includes a rotary shaft 6 provided near the end of the front surface 4 a of the heater core 4 on the side far from the air intake 3, and a door body 7 fixed to the rotary shaft 6. Basically configured.

A seal member 8 made of, for example, urethane is formed around the end of the door body 7 so as to prevent air leakage, and a heater case for the seal member 8 is formed. From the surface 40, 41 side of 2, that is, the axial end portion, flat plate-shaped projections 30, 31 having a thickness smaller than that of the seal member 8 linearly extend about 3 mm in the axial direction of the rotary shaft. The gap between the air mix door 5 and the surfaces 40 and 41 of the heater case 2 is closed.

As a result, air does not leak from the gap between the air mix door 5 and the heater case 2, so that the air mix door 5 moves toward the cool air passage 11 in order to shift from the full hot mode to the cool mode. It is possible to prevent a large amount of air from flowing into the cold air passage 11 even though the cold air passage 11 is slightly opened from the completely closed state.

On the contrary, in order to shift the full cool mode to the hot mode slightly, the air mix door 5 slightly opens the warm air passage 10 from the state in which the warm air passage 10 is completely closed. Nevertheless, a large amount of air can be prevented from flowing into the hot air passage 10.

However, in the conventional heater unit 1, as shown by the solid line in the characteristic diagram of FIG. 10, for example, even though the full hot mode is slightly shifted to the cool mode, the temperature of the blown air is reduced. The temperature of the blown air can be gradually decreased as shown by the broken line in the characteristic diagram.

Further, in the conventional heater unit 1, as shown by the solid line in the characteristic diagram of FIG. 10, for example, the temperature of the blown air suddenly increases even though the full cool mode is slightly shifted to the hot mode. Although it was rising, the temperature of the blown air can be gradually raised as shown by the dotted line in the characteristic diagram.

In the above description, the protrusions 30 and 31 are described as linearly extending about 3 mm in the axial direction of the protrusion rotating shaft 6 of the seal member 8, but the present invention is not limited to this, and FIG. As shown in FIG. 3, it may have a dimension of 3 mm or more and may be curved toward the inside of the air conditioner. As a result, since the protrusions 30 and 31 are constantly pressed against the heater case 2, it is possible to further prevent air leakage, and it is possible to effectively suppress a sudden drop or rise in the temperature of the blown air.

Although the protrusions 30 and 31 have been described as the protrusions of the seal member 8 extending only in the axial direction of the rotary shaft 6, the present invention is not limited to this, and as shown in FIG. The protrusion 32 may be extended in the direction of the air intake 3 (on the tip side).

Next, another embodiment of the present invention embodied in the heater case 2 of the heater unit 1 will be described with reference to FIGS. 7 to 9. However, the same configurations as those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted.

The air mix door 5 is also fixed to the rotary shaft 6 and the rotary shaft 6 provided near the end of the front surface 4 a of the heater core 4 on the side far from the air intake 3, as in the previous embodiment. The door body 7 is basically configured by the above-mentioned door body 7, and flat plate-shaped sealing members 51 and 52 are formed on both sides of the door body 7 on the ventilation side so as to sandwich the door body 7.

In the rotation range of the air mix door 5, the upper and lower surfaces 40 and 41 of the heater case 2 are curved at a predetermined angular width from the side of the heater core 4 to the side of the air intake 3, so that about 1 The ridges 40a and 41a having a height of 0.5 mm to less than about 3 mm bulge in a substantially fan shape around the rotation shaft 6, and likewise have a predetermined angular width from the locking portion 15 side to the air intake 3 side. Since the upper and lower surfaces 40, 41 of the heater case 2 are curved, the raised portions 40b, 41b having a height of about 1.5 mm to less than about 3 mm are raised in a substantially fan shape about the rotation shaft 6.

As a result, when the air-mix door 5 is located in the portion where the raised portions 40a, 40b and 41a, 41b are formed, the gap between the air-mix door 5 and the heater case 2 is small, and thus the gap is small. Less air leaks.

Therefore, for example, when the air mix door 5 opens the cold air passage 11 slightly from the completely closed state of the cold air passage 11 in order to shift the full hot mode to the cool mode slightly (however, It is necessary for the air mix door 5 to be in the portion where the protrusions 40b and 41b are formed.), And a large amount of air can be prevented from flowing into the cold air passage 11.

On the contrary, in order to shift from the full cool mode to the hot mode, the air mix door 5 slightly opens the warm air passage 10 from the state where the warm air passage 10 is completely closed. (However, it is necessary that the air mix door 5 is located in a portion where the raised portions 40a and 41a are formed.) It is possible to prevent a large amount of air from flowing into the warm air passage 10.

However, in the conventional heater unit 1, as shown by the solid line in the characteristic diagram of FIG. 10, for example, the temperature of the blown air drops sharply even though the full hot mode is slightly shifted to the cool mode. However, the temperature of the blown air can be gradually decreased as shown by the dotted line in the characteristic diagram. Further, in the conventional heater unit 1, the temperature of the blown air increased sharply, for example, even though the full-cool mode was slightly shifted to the hot mode, as shown by the broken line in the characteristic diagram. The temperature of blown air can be raised.

[0035]

[Effect of device]

 As described above, according to the first aspect of the present invention, the protrusion formed on the axial end portion of the air mix door causes air leakage from the gap between the heater case and the air mix door in the axial direction. Since it disappears, it is possible to prevent the temperature of blown air from suddenly lowering or rising due to a large amount of air flowing in when shifting from the full hot mode to the cool mode or when shifting from the full cool mode to the hot mode.

Further, according to the invention as set forth in claim 2, due to the raised portions which are raised inward on both sides of the heater case, air leaks from the gap between the heater case and the air mix door in the axial direction of the air mix door. Therefore, when the full hot mode shifts to the cool mode or the full cool mode shifts to the hot mode, it is possible to suppress a sudden decrease or rise in the temperature of the blown air due to a large amount of air flowing in.

[Brief description of drawings]

FIG. 1 is a schematic view showing an overall configuration of a heater unit having an improved air mix door among the embodiments of the heater unit according to the present invention.

FIG. 2 is a perspective view of the above air mix door.

FIG. 3 is a front view showing a main part of the internal configuration of the heater unit of the above.

FIG. 4 is a lateral view showing a main part of an internal configuration of the above heater unit.

FIG. 5 is a lateral view showing another embodiment of the shape of the protrusion of the air mix door of the heater unit of the above.

FIG. 6 is a perspective view showing another embodiment in which the protrusion of the air mix door of the heater unit is formed over the entire circumference.

FIG. 7 is a schematic view showing an overall configuration of a heater unit having an improved heater case among the embodiments of the heater unit according to the present invention.

FIG. 8 is a top view showing a main part of an internal configuration of the heater unit of the above.

FIG. 9 is a front view showing a main part of an internal configuration of the above heater unit.

FIG. 10 is a characteristic diagram showing a change in temperature of blown air in the heater unit of the present application due to a change in blowout mode.

[Explanation of symbols]

 1 Heater Unit 2 Heater Case 3 Air Intake 4 Heater Core 5 Air Mix Door 6 Rotating Shafts 30, 31, 32 Protrusions 40 Surfaces 41 Surfaces 40a, 40b Raised Parts 41a, 41b Raised Parts

Claims (2)

[Scope of utility model registration request] 1. A heater case having an air intake formed therein, a heater core for heating air sucked from the air intake, and a rotary shaft extending over the heater case for pivotally adjusting the opening. Accordingly, at least an air mix door that distributes air that passes through the heater core and air that bypasses the heater core is formed, and a projection portion is formed at least at an axial end portion of the air mix door. Heater unit. 2. A heater case having an air intake formed therein, a heater core for heating air sucked from the air intake, and a rotary shaft extending over the heater case for pivotally adjusting the opening. Thereby, at least an air mix door that distributes air that passes through the heater core and air that bypasses the heater core is provided, and a surface of the heater case on the axial end side of the air mix door faces inward. A heater unit having a raised portion.