JPH1178982A - Seal structure of dash panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure of a dash panel capable of improving the mounting workability without receiving the pressing reaction of the dash panel when a heat exchanger unit is mounted in a cabin. SOLUTION: Even when a heat exchanger unit 1 is pushed to the prescribed position toward a dash panel 20 side, grommets 14 of a piping connection part 13 and its peripheral side part are received by a working hole 23 larger in diameter than these parts, and no pushing reaction is generated in the dash panel 20. When a lid 25 is tightened and fixed to a front side of a peripheral edge part of the working hole from an engine room side, a forward end of the piping connection part 13 enters an opening window part 27 in the center of the lid 25, and the grommets 14 is compressed between a projected edge part 28 and a forward side of the heat exchanger unit 1 to generate the seal reaction, and the sufficient sealability can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work hole formed through a dash panel for connecting an air conditioner mounted in a vehicle interior to a pipe for supplying and discharging a heat source fluid disposed in an engine room. The present invention relates to a dash panel sealing structure for sealing.

[0002]

2. Description of the Related Art When an air conditioner is installed in a vehicle cabin,
An annular grommet made of an elastic material such as sponge rubber is fitted on a peripheral side portion of a pipe connection portion provided to protrude from the front side surface of the heat exchanger unit, and the grommet is mounted when the heat exchanger unit is mounted in a vehicle interior. The heat exchanger unit is pushed forward toward the dash panel side, and the grommet is pressed between the periphery of the working hole formed in the dash panel on the passenger compartment side and the front side surface of the heat exchanger unit. It is customary to seal around the working hole of the dash panel by mounting and fixing the heat exchanger unit in a state where a required sealing reaction force is generated in the grommet.

[0003]

Since the heat exchanger unit is pressed against the dash panel to generate a required sealing reaction force on the grommet, the heat exchanger unit is mounted and fixed in the vehicle interior. It is unavoidable that the mounting reaction of the heat exchanger unit becomes unstable due to the pressing reaction force and the workability of assembling to the vehicle body side member is deteriorated.

In view of the above, the present invention can improve the workability of assembling the heat exchanger unit to the vehicle body side member without generating a pressing reaction force of the dash panel when the heat exchanger unit is mounted in the vehicle interior. An object of the present invention is to provide a dash panel sealing structure capable of securely sealing around a work hole of a dash panel.

[0005]

According to a first aspect of the present invention, a heat exchanger installed in an engine room is provided at a front side of a heat exchanger unit of an air conditioner mounted in a vehicle cabin. A pipe connecting portion of a pipe for supplying and discharging a heat source fluid is provided in the exchanger so as to protrude, and an annular grommet made of an elastic material is fitted around a peripheral side of the pipe connecting portion. A working hole having a diameter larger than that of the grommet formed in a dash panel formed, and an opening portion through which the pipe connection portion can be inserted into a central portion at a peripheral portion of the working hole on the engine room side; A lid having a ridge protruding rearward from the periphery of the portion and inserted into the working hole is fastened and fixed, and the grommet is fixed to the front side of the heat exchanger unit by the ridge. It is characterized by being pressed.

According to a second aspect of the present invention, the rear surface of the lid according to the first aspect is arranged on the outer peripheral side of the protruding edge portion, and is pressed between the lid and the front surface of the peripheral portion of the working hole of the dash panel. The present invention is characterized in that an annular seal member is mounted.

[0007]

According to the first aspect of the present invention, the working hole of the dash panel is formed to have a larger diameter than the annular grommet fitted on the peripheral side of the pipe connection on the front side of the heat exchanger unit. When the heat exchanger unit is mounted in the vehicle cabin, even if the heat exchanger unit is pushed to the dash panel side to a predetermined position, the grommet is received in the work hole and the pressing reaction force of the dash panel does not occur. Therefore, the mounting posture of the heat exchanger unit can be stabilized, and the workability of assembling the heat exchanger unit to the vehicle body side member can be improved.

On the other hand, when the lid is fastened and fixed to the front of the peripheral portion of the working hole from the engine room side after mounting the heat exchanger unit in the vehicle interior, the front end of the pipe connection portion of the heat exchanger unit is located at the center of the lid. Since it enters the fenestration and is exposed in the engine room, it is possible to easily connect the pipe to the pipe connection part, and a protruding edge protruding toward the rear side at the periphery of the fenestration. Since the grommet abuts against the front surface of the grommet and presses the grommet between the protruding edge portion and the front surface of the heat exchanger unit to generate a sealing reaction force, a peripheral seal penetrating the pipe connection portion of the dash panel is provided. Property can be sufficiently secured.

According to the second aspect, in addition to the effect of the first aspect, when the lid is fastened and fixed to the peripheral portion of the working hole on the engine room side, the annular sealing member provided on the rear surface of the lid is engaged with the lid. Since the sealing reaction force is generated by being pressed against the front surface of the peripheral portion of the hole, the sealing performance around the working hole can be further improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 4 shows a heat exchanger unit of an air conditioner. The heat exchanger unit 1 includes an evaporator 3 as a heat exchanger in a unit case 2 and a heater core 4 as a heat exchanger on the upper side. Are placed horizontally and arranged in multiple stages in the vertical direction.

The portion where the evaporator 3 and the heater core 4 are disposed is vertically separated from each other, and the air blown from a blower unit (not shown) to a blower connection port 5 provided on one side wall of the unit case 2 is supplied to the evaporator. The cooling air is circulated from the upper side to the lower side of the unit 3 and cooled, and the cooled air is circulated upward through an air passage (not shown) formed along the rear side wall of the unit case 2.

The air flowing upward in the air passage can be bypassed to the lower side of the heater core 4 and can flow upward from the lower side of the heater core 4, and the temperature can be increased by the evaporator 3 and / or the heater core 4. The adjusted air is supplied from a vent outlet 6 or a defroster outlet 7 provided on the upper wall of the unit case 2 or a foot outlet 8 provided on the upper side wall of the unit case 2 to various ducts (not shown). It has become so.

The bypass circulation of the air to the heater core 4 and the blowing of the air from the various outlets 6, 7, 8 are performed by controlling the air distribution of various doors (not shown).

The evaporator 3 has upper and lower refrigerant tanks 11 for supplying and discharging a refrigerant as a heat source fluid mounted on the front side thereof, and an expansion valve 12 attached to the upper refrigerant tank 11.

The front end of the expansion valve 12 is formed as a horizontally long circular pipe connection portion 13. A pair of pipe connectors 13a is provided on an end surface of the pipe connection portion 13, and the pipe connector 13a is connected to the inside of the engine room. Are connected to refrigerant pipes on the refrigerant supply side and the refrigerant discharge side (not shown).

As shown in FIGS. 1 and 2, the pipe connection portion 13 is disposed so as to protrude outward from an opening 9 provided in the front side wall of the unit case 2, and the pipe connection portion protruding outside the unit case 2. An annular grommet 14 made of an elastic material such as sponge rubber and formed in an oblong shape is fitted on the peripheral side portion of 13.

The grommet 14 presses the rear end of the body 15 into the opening 9 to elastically engage the locking groove 16 formed on the outer periphery of the rear end with the periphery of the opening 9. A first seal lip 17 also serving as a stopper protruding from the front edge is elastically brought into close contact with the front surface of the peripheral portion of the opening 9 to seal around the opening 9.

A second seal lip 18 is integrally formed on the inner periphery of the front end of the body 15 of the grommet 14,
The second seal lip 18 is elastically adhered to the peripheral side surface of the pipe connection portion 13 to seal around the peripheral side portion of the pipe connection portion 13.

Further, an outer periphery of a front end portion of the body portion 15 of the grommet 14 is formed in an L-shaped cross section by a front side wall and a peripheral side wall, and the rear end of the peripheral side wall is in close contact with the front side surface of the unit case 2 for sealing. The third seal lip 19 forming the space S is integrally formed.

The vertical wall 21 of the dash panel 20 which separates the engine room ER from the cabin R has a horizontally-long circular shape having a diameter larger than that of the grommet 14 fitted on the peripheral side of the pipe connection portion 13. A working hole 23 is formed.

The heat exchanger unit 1 is hung on a steering member arranged in the vehicle width direction on the back side of an instrument panel (not shown) and is mounted and fixed away from the dash panel 20, or 20 is mounted and fixed on a floor tunnel portion 22 following the vertical wall 21. In any case, at a predetermined mounting position, the front end of the pipe connection portion 13 is together with the front end of the body portion 15 of the grommet 14. It comes into the working hole 23.

Reference numeral 25 denotes a lid fastened and fixed to the periphery of the working hole 23 of the dash panel 20 from the engine room ER side after mounting the heat exchanger unit 1 in the vehicle compartment R. As shown in FIG. 3, a fastening seat 26 is formed on each of the left and right sides of the dash panel 20, and the fastening seat 26 is overlapped on the front surface of the vertical wall 21 of the dash panel 20, and is passed through the bolt insertion hole 26a. The bolt 33 and the weld nut 34 are fastened and fixed to the vertical wall 21.

At the center of the lid 25, the pipe connection 1
3 and the front end of the body portion 15 of the grommet 14 are formed with a horizontally long oval window 27 having a size capable of being inserted, and a protruding edge 2 projecting rearward from the periphery of the window 27.
8, the front end of the pipe connection portion 13 and the front end of the trunk 15 of the grommet 14 are received in the fenestration 27, and the front end of the trunk 15 is brought into close contact with the inner periphery of the fenestration 27. At the same time, the third sealing lip 1 of the grommet 14 is
9, the third seal lip 19 is pressed between the protruding edge portion 28 and the front side surface of the unit case 2 to generate a required seal reaction force.

On the back surface of the lid 25, an annular concave portion 29 is formed following the outer peripheral portion of the protruding edge portion 28.
An annular seal member 30 made of an elastic material such as rubber is mounted on the lid, and the seal member 30 is pressed between the lid 25 and the front surface of the peripheral portion of the working hole 23 to generate a required seal reaction force. Let me.

The seal member 30 has two fastener portions 31 protruding at two locations in the longitudinal direction thereof, and the fastener portion 31 is press-fitted and fixed in a mounting hole 32 provided in the concave portion 29.

According to the structure of the above embodiment, the work hole 23 provided in the vertical wall 21 of the dash panel 20 is fitted on the peripheral side of the pipe connection portion 13 projecting from the front side of the heat exchanger unit 1. When the heat exchanger unit 1 is mounted in the vehicle cabin R, the heat exchanger unit 1 is pushed to the vertical wall 21 side of the dash panel 20 to a predetermined position. The grommet 14 moves the work hole 2
3 does not generate a pressing reaction force of the vertical wall 21. Therefore, the mounting posture of the heat exchanger unit 1 can be stabilized, and the workability of assembling to the vehicle body side member can be improved. Can be.

On the other hand, when the lid 25 is fastened and fixed to the front of the peripheral portion of the working hole 23 from the engine room ER side after mounting the heat exchanger unit 1 in the vehicle compartment R, the pipe connection of the heat exchanger unit 1 is performed. Since the front end of the portion 13 enters the window 27 at the center of the lid 25 and is exposed in the engine room E / R, the pipe connector 13a of the pipe connection portion 13
It is possible to easily connect a refrigerant pipe (not shown) as a pipe to be connected to the air conditioner.

A protruding edge 28 projecting rearward from the periphery of the window 27 abuts against the front surface of the front side wall of the third seal lip 19 of the grommet 14 to project the third seal lip 19. Since the pressure is clamped between the edge 28 and the front side surface of the unit case 2, the third seal lip 19 is bent and deformed as shown in FIG. Front wall of lip 19 and grommet body 1
5 comes into close contact with the front end of the third seal lip 19, and the rear end of the peripheral side wall of the third seal lip 19 comes into close contact with the front side surface of the unit case 2. Is formed, around the penetrating portion of the pipe connection portion 13 in the dash panel 20 and the unit case 2
The sealability around the opening 9 in which the grommet 14 is fitted can be sufficiently ensured.

Further, the annular sealing member 30 provided on the rear surface of the lid 25 is pressed between the lid 25 and the front surface of the peripheral portion of the working hole 23 to generate a sealing reaction force.
The sealing performance around the work hole 23 can be further enhanced.

In the above embodiment, the evaporator 3 is taken as an example of the heat exchanger, and the sealing structure around the pipe connection portion 13 is described in detail. However, the present invention is applied to the pipe connection portion 10 of the heater core 4 protruding to the front side of the unit case 2. Thus, the same effect as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of the present invention as viewed from a side.

FIG. 2 is a cross-sectional view of the same embodiment as viewed from above.

FIG. 3 is a rear view of the lid.

FIG. 4 is a perspective view showing an example of a heat exchanger unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger unit 3 Heat exchanger 13 Piping connection part 14 Grommet 20 Dash panel 23 Work hole 25 Lid 27 Window part 28 Protrusion part 30 Seal member

Claims (2)

[Claims] 1. A heat exchanger unit (1) arranged in an engine room (ER) at a front side of a heat exchanger unit (1) of an air conditioner mounted in a vehicle compartment (R). A pipe connecting portion (13) of a pipe for supplying and discharging a heat source fluid is provided to protrude from the heat exchanger (3) in the inside, and the pipe connecting portion (1) is provided.
An annular grommet (1) made of an elastic material is provided on the peripheral side of 3).
4), the vehicle room (R) and the engine room (E
Forming a working hole (23) having a diameter larger than that of the grommet (14) in the dash panel (20) that separates the grommet (R);
A window (27) through which the pipe connection (13) can be inserted at the center of the periphery of the working hole (23) on the engine room (ER) side, and a window (27). A lid (25) having a protruding edge (28) inserted into the working hole (23) protruding rearward from the peripheral edge of the grommet (28) is fastened and fixed, and the grommet ( (14) The dash panel seal structure, wherein (14) is pressed against the front side surface of the heat exchanger unit (1). 2. A rear edge of the lid (25) has a protruding edge (2).
8) an annular seal member (30) which is disposed on the outer peripheral side and is pressed between the lid (25) and the front surface of the periphery of the working hole (23) of the dash panel (20). The dash panel seal structure according to claim 1, characterized in that: