JP2009227027A - Waterproof structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof structure for a vehicle capable of preventing the invasion of water from an engine compartment side, passing the periphery of a diaphragm case even in a case where a gap is formed between the diaphragm case and a packing material. <P>SOLUTION: A first packing material 50 seals a space between a hole forming part 11 and a housing 31, and also seals a space between the hole forming part 11 and the diaphragm case 134. A diaphragm cover part 140 is formed so as to cover the diaphragm case 134 from the engine compartment side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a waterproof structure for a vehicle.

  Conventionally, in a vehicle air conditioner, for example, as shown in Patent Document 1, a refrigerant that flows into a cooling heat exchanger according to the degree of superheat of the refrigerant that has flowed out of the cooling heat exchanger disposed on the vehicle interior side. There are some provided with an expansion valve that expands, an annular cover member that covers the outer peripheral surface of the expansion valve, and a seal member that seals between the cover member and the expansion valve.

  The expansion valve includes a joint block that is connected to a condenser-side refrigerant pipe penetrating the through-hole of the dashboard and a cooling heat exchanger-side refrigerant pipe to form a refrigerant flow path.

The joint block is provided with a valve body that adjusts the opening degree of the refrigerant flow path that flows through the cooling heat exchanger. Disposed on the upper side of the joint block is a disc-shaped diaphragm that moves based on the degree of heating of the refrigerant flowing out from the cooling heat exchanger to drive the valve body, and a disc-shaped diaphragm case that houses the diaphragm Has been.
JP 2002-301927 A

  In the above-described vehicle air conditioner, the diaphragm case is formed in a disc shape. For this reason, when a packing material is wound around the expansion valve, irregularities are formed on the outer shape of the diaphragm case. Therefore, a gap is formed between the diaphragm case and the packing material. Thereby, the airtightness between the cover member and the expansion valve cannot be improved, and water may enter the vehicle compartment from the inside of the engine room.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle waterproof structure that prevents water from entering the vehicle interior.

In order to achieve the above object, according to the first aspect of the present invention, the vehicle is disposed in the through hole (21) of the partition wall (20) for partitioning between the vehicle interior and the exterior of the vehicle interior, A cover member (10) having a hole (12) passing therethrough;
The refrigerant pipe disposed in the hole of the cover member and connected to the refrigerant pipe on the high-pressure side heat exchanger (210) side outside the passenger compartment and the refrigerant pipe on the low-pressure side heat exchanger (220) side inside the passenger compartment are connected to each other. A joint part (31, 32, 33) constituting a refrigerant flow path (25) for flowing the refrigerant from the high-pressure side heat exchanger side toward the low-pressure side heat exchanger side, and provided in the joint part, the refrigerant flow A valve body (131) for adjusting the opening degree of the passage; a diaphragm case (134) disposed between the joint portion and the hole forming portion (11) forming the hole portion of the cover member; An expansion valve (30) having a diaphragm (133) housed in the diaphragm case and displaced based on the heating degree of the refrigerant flowing out from the low-pressure side heat exchanger to drive the valve body;
A first packing member formed so as to surround the joint portion and the diaphragm case, sealing between the hole forming portion and the housing, and sealing between the hole forming portion and the diaphragm case ( 50), a waterproof structure for a vehicle,
The cover member includes a diaphragm cover part (140) formed so as to cover the diaphragm case from the outside of the passenger compartment.

  Thereby, even if water invades from the vehicle compartment outside to the diaphragm case side from the engine room side, the diaphragm cover portion can be prevented from entering the periphery of the diaphragm case. Accordingly, it is possible to prevent water from the engine room side from entering the vehicle compartment through the periphery of the diaphragm case.

  The invention according to claim 2 is characterized in that the diaphragm cover portion is formed so as to cover the diaphragm case side end portion (31a) of the joint portion from the outside of the passenger compartment.

  Thereby, it can prevent more reliably that a diaphragm cover part penetrate | invades into the circumference | surroundings of a diaphragm case.

  In the invention which concerns on Claim 3, it arrange | positions between the said diaphragm cover part, the said joint part, and the said diaphragm case, and seals between the said diaphragm cover part, the said joint part, and the said diaphragm case. Two packing members (51) are provided.

  Thereby, it can prevent more reliably that a diaphragm cover part penetrate | invades into the circumference | surroundings of a diaphragm case.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
1 and 2 show a first embodiment of the waterproof structure of the present invention. FIG. 1 is a view of the waterproof structure of the first embodiment viewed from the vehicle width direction, and FIG. 2 is a view of the waterproof structure viewed from the engine room side.

  The cover member 10 is disposed in the through hole 21 of the firewall 20, and the cover member 10 is supported by the firewall 20. The firewall 20 is a partition wall that partitions between the vehicle interior and the engine room (outside the vehicle interior). The cover member 10 constitutes a hole forming portion 11 that forms the through hole 12. The through hole 12 penetrates between the vehicle compartment side and the engine room side.

  An expansion valve 30 is disposed in the through hole 12. The expansion valve 30 includes a housing 31 and flange portions 32 and 33. The housing 31 is fixed to the flange portions 32 and 33 by bolts 55a, 55b, and 55c (one bolt 55a is shown in FIG. 1).

  The housing 31 and the flange portions 32 and 33 are members made of a metal such as aluminum, and constitute a joint portion.

  The housing 31 has a through hole 25 and a through hole 26 formed therein.

  The through holes 26 are opened to the vehicle interior side and the engine room inner side, respectively. An enlarged diameter portion 15 b of the refrigerant pipe 15 is inserted into one end portion of the through hole 26. A diameter enlarged portion 28 b of the refrigerant pipe 28 is inserted into the other end portion of the through hole 26.

  The through hole 26 constitutes a refrigerant flow path on the low pressure side. The refrigerant pipe 15 is connected to the refrigerant inlet of the compressor 200. The compressor 200 constitutes a refrigeration cycle apparatus, compresses the refrigerant, and discharges it to a condenser (high-pressure side heat exchanger) 210. The refrigerant pipe 28 is connected to the refrigerant outlet of the cooling heat exchanger 220. The cooling heat exchanger 220 is a low-pressure heat exchanger that is disposed on the vehicle interior side and cools the vehicle interior air by evaporation of the refrigerant.

  The through holes 25 are opened on the vehicle interior side and the engine room inner side, respectively. An enlarged diameter portion 14 b of the refrigerant pipe 14 is inserted into one end portion of the through hole 25. A diameter enlarged portion 27 b of the refrigerant pipe 27 is inserted into the other end portion of the through hole 25.

  Here, the through-hole 25 constitutes a high-pressure side refrigerant flow path. The refrigerant pipe 14 is connected to the refrigerant outlet of the condenser 210. The condenser 210 is a heat exchanger that is disposed in the engine room and cools the refrigerant by outside air. The refrigerant pipe 27 is connected to the refrigerant inlet of the cooling heat exchanger 220.

  A temperature sensing rod (heat stem) 129 made of a metal having good thermal conductivity such as aluminum is disposed in the through hole 26, and a spherical valve body 131 is in contact with the lower end of the temperature sensing rod 129. Are arranged.

  A throttle passage 132 is formed in a bent portion in the middle of the through hole 25, and the opening degree of the throttle passage 132 is adjusted by a spherical valve body 131. That is, the valve body 131 adjusts the opening degree of the refrigerant flow path. The throttle passage 132 depressurizes the high-pressure liquid refrigerant from the refrigerant pipe 14 side into a low-temperature and low-pressure gas-liquid two-phase state.

  The upper end side of the temperature sensing rod 129 is in contact with a thin film diaphragm 133, and the valve body 131 is urged by the diaphragm 133 in the valve opening direction (downward in FIG. 1).

  The diaphragm 133 is disposed on the upper side of the housing 31. The diaphragm 133 is formed in a disk shape, and the diaphragm 133 is located between the hole forming portion 11 of the cover member 10 and the housing 31.

  The diaphragm 133 is disposed in a disc-shaped diaphragm case 134 and partitions the space in the diaphragm case 134 into an upper first pressure chamber 135 and a lower second pressure chamber 136.

  The diaphragm case 134 includes first and second diaphragm cases 134a and 134b obtained by press-molding relatively thin metal plates into a predetermined shape, and the first and second diaphragm cases 134a with the outer peripheral surface of the diaphragm 133 sandwiched therebetween. 134b are integrated by caulking.

  Further, the entire diaphragm case 134 is integrally assembled with the housing 10 by screwing the second diaphragm case 134 b into one end of the housing 10.

  The first pressure chamber 135 formed by the diaphragm 133 and the first diaphragm case 134a is filled with a refrigerant that is in a substantially saturated vapor state under the condition that the refrigeration cycle is operated.

  Therefore, the temperature fluctuation (superheat degree fluctuation) of the refrigerant exiting the cooling heat exchanger 220, that is, the gas refrigerant passing through the through hole 26 is transmitted to the refrigerant in the first pressure chamber 135 through the temperature sensing rod 129. As a result, the pressure in the first pressure chamber 135 changes.

  On the other hand, the second pressure chamber 136 formed by the diaphragm 133 and the second diaphragm case 134b is always in communication with the second through hole 26 through a space 137 formed between the temperature sensing rod 129 and the housing 31, The pressure in the second pressure chamber 136 is the same as that of the through hole 26.

  A coil spring (spring means) 138 for urging the valve body 131 in the valve closing direction is disposed in the through hole 25, and one end portion of the coil spring 138 is applied to the valve body 131 via the support base 139. Act. The other end of the coil spring 138 is supported by a metal plug 40, and this metal plug 40 is fixed to the screw hole of the housing 31 so that the position of the coil spring 38 can be adjusted. The mounting load of the coil spring 38 is adjusted by adjusting the position of the metal plug 40. it can.

  With this configuration, the valve element 131 is driven by the balance between the displacement of the diaphragm 133 due to the pressure difference between the first and second pressure chambers 135 and 136 and the force of the coil spring 138, and the opening area ( The valve opening is controlled to be optimum.

  The flange portion 32 is disposed on the engine room side (the vehicle compartment outer side) with respect to the housing 31. The flange portion 32 is provided with through holes 32a and 32b.

  The refrigerant pipe 15 passes through the through hole 32 a of the flange portion 32. The opening area of the through hole 32a is larger than the cross-sectional area of the diameter enlarged portion 15b of the refrigerant pipe 15 (that is, the cross-sectional area in the direction orthogonal to the longitudinal direction of the refrigerant pipe 15). Thereby, the flange part 32 has stopped the refrigerant | coolant piping 15 coming out from the through-hole 26. FIG.

  The refrigerant pipe 14 passes through the through hole 32 b of the flange portion 32. The opening area of the through hole 32b is larger than the cross-sectional area of the diameter enlarged portion 15b of the refrigerant pipe 14 (that is, the cross-sectional area in the direction orthogonal to the longitudinal direction of the refrigerant pipe 14). Thereby, the flange part 32 has stopped the refrigerant | coolant piping 14 coming out from the through-hole 25. FIG.

  Here, an O-ring 14 a is attached to the diameter enlarged portion 14 b of the refrigerant pipe 14. The O-ring 14 a is a seal member that seals between the hole forming portion that forms the through hole 25 in the housing 31 and the enlarged diameter portion 14 b and prevents the refrigerant from leaking from the through hole 25.

  An O-ring 15 a is attached to the diameter enlarged portion 15 b of the refrigerant pipe 15. The O-ring 15 a is a sealing member that seals between the hole forming portion that forms the through hole 26 and the enlarged diameter portion 15 b in the housing 31 and prevents the refrigerant from leaking from the through hole 26.

  The flange portion 33 is disposed on the vehicle interior side with respect to the housing 31. The flange portion 33 is provided with through holes 33a and 33b.

  The refrigerant pipe 28 passes through the through hole 33 a of the flange portion 33. The opening area of the through-hole 33a is larger than the cross-sectional area of the diameter enlarged portion 28b of the refrigerant pipe 28 (the cross-sectional area in the direction orthogonal to the longitudinal direction of the refrigerant pipe 28). Thereby, the flange part 33 has stopped the refrigerant | coolant piping 28 coming out from the through-hole 26. FIG.

  The refrigerant pipe 27 passes through the through hole 33 b of the flange portion 33. The opening area of the through hole 33b is larger than the cross-sectional area of the enlarged diameter portion 27b of the refrigerant pipe 27 (the cross-sectional area in the direction orthogonal to the longitudinal direction of the refrigerant pipe 27). Thereby, the flange part 33 has stopped the refrigerant | coolant piping 27 falling out from the through-hole 25. FIG.

  Here, an O-ring 28 a is attached to the diameter enlarged portion 28 b of the refrigerant pipe 28. The O-ring 28 a is a seal member that seals between the hole forming portion that forms the through hole 26 and the diameter enlarged portion 28 b in the housing 31 and prevents the refrigerant from leaking from the through hole 26.

  An O-ring 27 a is attached to the diameter enlarged portion 27 b of the refrigerant pipe 27. The O-ring 27 a is a seal member that seals between the hole forming portion that forms the through-hole 25 and the diameter-enlarged portion 27 b in the housing 31 and prevents the refrigerant from leaking from the through-hole 25.

  The first packing member 50 is a belt-like member made of an elastic material such as urethane foam, and is formed so as to surround the housing 31, the flange portion 33, and the diaphragm case 134. The first packing member 50 is compressed and sealed by elastic deformation between the expansion valve 30 and the hole forming portion 11.

  Specifically, the first packing member 50 seals between the hole forming portion 11 and the housing 31 and seals the hole forming portion 11 and the diaphragm case 134. Further, the first packing member 50 is sealed between the hole forming portion 11 and the flange portion 33. The first packing member 50 protrudes from the flange portion 33 toward the vehicle interior side.

  Further, the cover member 10 includes a diaphragm cover part 140 formed so as to cover the diaphragm case 134 (that is, the diaphragm 133) from the engine room side. The diaphragm cover part 140 is located closer to the diaphragm 133 than the end 31a of the housing 31 on the diaphragm case 133 side. The diaphragm cover part 140 forms a gap S between the housing 31 and the end part 31a on the diaphragm case 133 side.

  According to the present embodiment described above, the diaphragm cover 140 is formed so as to cover the diaphragm case 134 (that is, the diaphragm 133) from the engine room side. For this reason, it is possible to prevent water from entering the periphery of the diaphragm case 134 from the engine room side.

  Therefore, even when a gap is formed between the diaphragm case 134 and the packing material, it is possible to prevent the vehicle from passing through the periphery of the diaphragm case 134 from the engine room side and entering the vehicle interior.

(Other embodiments)
In the above-described embodiment, the example in which the diaphragm cover portion 140 is formed so as to be positioned closer to the diaphragm 133 side than the end portion 31a on the diaphragm case 133 side of the housing 31 is described, but not limited thereto, as illustrated in FIG. The diaphragm cover portion 140 may be formed so as to cover the end portion 31a of the housing 31 on the diaphragm case 133 side from the engine room side.

  Thereby, even if water flies from the engine room side, it can be prevented from passing through the periphery of the diaphragm case 134 and entering the vehicle interior side from the engine room side.

  In FIG. 3, the same reference numerals as those in FIG.

  In the above-described embodiment, the diaphragm cover portion 140 has an example in which the gap S is formed between the housing 31 and the end portion 31a on the diaphragm case 133 side. However, the present invention is not limited to this, as shown in FIG. The second packing member 51 may be disposed between the diaphragm cover part 140 and the housing 31.

  Here, the second packing member 51 is made of an elastic material such as urethane foam. The second packing member 51 is compressed by elastic deformation between the diaphragm case 133, the diaphragm cover part 140, and the housing 31.

  Thereby, the second packing member 51 seals between the diaphragm cover portion 140, the diaphragm case 133, and the housing 31.

  Thereby, since the clearance gap S is eliminated among the diaphragm cover part 140, the diaphragm case 133, and the housing 31, the waterproofness between the cover member 10 and the expansion valve can be improved. In FIG. 3, the second packing member 51 may be disposed.

  In the above-described embodiment, the example in which the diaphragm case 134 is disposed on the upper side of the housing 31 has been shown. Alternatively, it may be arranged at a position other than the upper side of the housing 31.

It is a figure which shows the cross-sectional structure which shows the prevention structure for vehicles in one Embodiment of this invention. It is the figure which looked at the prevention structure for vehicles of Drawing 1 from the engine room side. It is a figure which shows the cross-sectional structure of the 1st modification of the prevention structure for vehicles in one Embodiment of this invention. It is a figure which shows the cross-sectional structure of the 2nd modification of the prevention structure for vehicles in one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cover member 14 Refrigerant piping 15 Refrigerant piping 20 Firewall 26 Through-hole (refrigerant flow path)
25 Through hole (refrigerant flow path)
30 Expansion valve 31 Housing 131 Valve body 133 Diaphragm 134 Diaphragm case 200 Compressor 210 Condenser (high-pressure side heat exchanger)
220 Heat exchanger for cooling (low pressure side heat exchanger)

Claims (3)

A cover member (10) that is disposed in a through hole (21) of a partition wall (20) that partitions the interior of the vehicle interior and the exterior of the vehicle interior and has a hole (12) that penetrates between the interior of the vehicle interior and the exterior of the interior of the vehicle interior. )When,
The refrigerant pipe disposed in the hole of the cover member and connected to the refrigerant pipe on the high-pressure side heat exchanger (210) side outside the passenger compartment and the refrigerant pipe on the low-pressure side heat exchanger (220) side inside the passenger compartment are connected to each other. A joint part (31, 32, 33) constituting a refrigerant flow path (25) for flowing the refrigerant from the high-pressure side heat exchanger side toward the low-pressure side heat exchanger side, and provided in the joint part, the refrigerant flow A valve body (131) for adjusting the opening degree of the passage; a diaphragm case (134) disposed between the joint portion and the hole forming portion (11) forming the hole portion of the cover member; An expansion valve (30) having a diaphragm (133) housed in the diaphragm case and displaced based on the heating degree of the refrigerant flowing out from the low-pressure side heat exchanger to drive the valve body;
A first packing member formed so as to surround the joint portion and the diaphragm case, sealing between the hole forming portion and the housing, and sealing between the hole forming portion and the diaphragm case ( 50), a waterproof structure for a vehicle,
The vehicle waterproof structure according to claim 1, wherein the cover member includes a diaphragm cover part (140) formed so as to cover the diaphragm case from the outside of the passenger compartment.   The waterproof structure for a vehicle according to claim 1, wherein the diaphragm cover portion is formed so as to cover the diaphragm case side end portion (31a) of the joint portion from the outside of the vehicle compartment.   A second packing member (51) disposed between the diaphragm cover portion, the joint portion, and the diaphragm case, and sealing between the diaphragm cover portion, the joint portion, and the diaphragm case; The waterproof structure for a vehicle according to claim 1 or 2, further comprising:

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