JPH11182980A - Refrigerant piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make compact the body of a mechanism for reducing the drain pulsation. SOLUTION: A relaxing unit 9 has a cylindrical mounting part 10 having parts 11 bent inwards in a refrigerant passage at the other end (at a rubber house 8) with spacings along the inside of the rubber house 8 (refrigerant passage). Four bent parts 11 are provided and made arcuate. A compressor is driven to cause a flow of the refrigerant as shown by arrow C which shows a periodic behavior with repeating high and low flow rates because of the pulsation driving of the compressor. When the flow rate is high, the refrigerant strikes against the bent parts 11 to cause these parts 11 to be elasticically deformed in direction E, thereby reducing the energy of the refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant pipe of a refrigeration cycle mounted on a vehicle for reducing discharge pulsation of high-pressure refrigerant discharged from a compressor.

[0002]

2. Description of the Related Art Conventionally, in a vehicle, a pipe between a discharge port of a compressor of a refrigeration cycle and an inlet of a condenser is formed by connecting a metal pipe such as aluminum and a rubber hose. Specifically, a metal joint usually called a darma is connected to the discharge port, and an aluminum pipe is connected to the metal joint by brazing. Further, a rubber hose is connected to the aluminum pipe, a metal pipe is further connected to the rubber hose, and a metal joint is connected to the metal pipe. A refrigerant passage is configured.

[0003] The reason why the rubber hose is used as the refrigerant pipe is that if the pipe is made entirely of metal, the pipe may be damaged by vibration of the vehicle or vibration caused by driving the compressor. Also, the compressor
As a structure for reducing the discharge pulsation, for example, a metal joint on the discharge port side, a first metal pipe, a metal muffler shaped to enlarge the flow path, and a second metal pipe are connected in this order,
What is unitized by brazing is well known. The rubber hose is connected to the second metal pipe.

[0004]

However, when a muffler is connected to reduce the discharge pulsation as described above, there is a problem that the size of the piping becomes large and the mountability on a vehicle is deteriorated. The present invention has been made in view of the above points, and has as its object to make a reduction mechanism for reducing discharge pulsation compact.

[0005]

In order to achieve the above object, the present invention employs the following technical means. According to the first to third aspects of the present invention, the metal pipe portion (7) constituting the refrigerant flow path and the outer peripheral portion at one end of the metal pipe portion (7) are formed of an elastically deformable material. A relief member (9) provided at one end of the metal pipe portion (7) and formed of an elastically deformable material and protruding inward of the refrigerant flow path. It is characterized by having been provided.

As a result, since the refrigerant is pulsated by the discharge pulsation of the compressor, the refrigerant flow has a periodic behavior such as becoming stronger or weaker. Therefore, the energy of the refrigerant is reduced by the elastic member being elastically deformed in the direction E in FIG. 2 by the flow of the refrigerant. This allows
The discharge pulsation of the compressor can be reduced. And since the relief member is provided in the high-pressure pipe, the reduction mechanism for significantly reducing the discharge pulsation can be made more compact than before.

According to the second aspect of the present invention, the relaxation member (9) is formed in a cylindrical shape, and has an attachment portion (10) which is fitted and attached to the outer peripheral portion of one end of the metal pipe portion. The hose is characterized in that it is bent so that the hose part (8) side protrudes inward at the other end side of the mounting part (10). Thereby, since the relief member is attached only by being fitted to the outer peripheral surface of the metal pipe, it is not necessary to attach the muffler by brazing as in the related art. A mechanism for reducing discharge pulsation can be simply attached.

Further, in the invention according to the third aspect, a plurality of relaxation members (9) are provided at intervals so as to be along the inner surface of the refrigerant flow path. This allows
The relieving member can be easily elastically deformed without greatly reducing the cross-sectional area of the refrigerant flow path, and the energy of the refrigerant can be favorably absorbed and reduced.

[0009] The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiment described later.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vehicle layout diagram of an air conditioning refrigeration cycle 1 mounted on a vehicle. Reference numeral 2 denotes a compressor for compressing the refrigerant to a high temperature and a high pressure.
Is driven by an engine mounted on the vehicle. Reference numeral 3 denotes a condenser for condensing and liquefying the high-temperature and high-pressure refrigerant from the compressor 1.

Reference numeral 4 denotes a receiver for separating the gas-phase refrigerant and the liquid-phase refrigerant from the refrigerant from the condenser 2 and storing the liquid-phase refrigerant.
An expansion valve for decompressing and expanding the liquid-phase refrigerant from the refrigerant is disposed. Reference numeral 5 denotes a cooling unit incorporating an evaporator (not shown) for evaporating and evaporating the refrigerant decompressed and expanded by the expansion valve. The cooling unit 5 forms a cooling unit of the vehicle air conditioner.

The compressor 2, the condenser 3, the receiver 4, the expansion valve, and the evaporator are connected by a refrigerant pipe constituting a refrigerant flow path.
Is composed. The space between the compressor 2 and the condenser 3 is generally called a high-pressure piping section 6, and is composed of a metal piping section forming a refrigerant flow path, a rubber hose, and the like. Hereinafter, this will be described. FIG. 2 shows a partial cross-sectional view of the high-pressure piping section 6.

An aluminum joint (not shown) is connected to a discharge port (not shown) of the compressor 2 closest to the compressor 2 in the high-pressure piping section 6. An aluminum metal pipe 7 (metal pipe section of the present invention) shown in FIG. 2 is connected to this joint. A rubber hose 8 (a hose part of the present invention) is connected to one end of the metal pipe 7 on the left side in FIG. The rubber hose 8 is formed of an elastically deformable material (rubber material, EPDM) and formed in a pipe shape with a circular cross section.

A metal pipe (not shown) similar to the metal pipe 7 is connected to the left side of the rubber hose 8 in FIG. 2, and a metal joint (not shown) made of aluminum is connected to the metal pipe. This metal joint is connected to the capacitor 3. Thereby, the high-pressure piping unit 6 is configured. A relief member 9, which is a main part of the present invention, is provided on an outer peripheral portion of one end of the metal pipe 7. In this embodiment, the relaxation member 9 is made of a material that can be elastically deformed (rubber material, EPD).
M).

As shown in FIG. 2, the relaxation member 9 has a mounting portion 10 formed in a cylindrical shape. The other end (the rubber hose 8 side) of the mounting portion 10 is a bent portion 11 bent inside the refrigerant passage. FIG. 3 is a schematic side view viewed from the direction A in FIG. As shown in FIG. 3, a plurality of bent portions 11 are provided at intervals so as to be along the inner surface of the rubber hose 8 (coolant flow path), and four in this example. The bent portion 11 is formed in an arc shape as shown in FIG.

Next, a method of assembling the metal pipe 7, the rubber hose 8, and the relaxation member 9 will be described. First, FIG.
In (2), the mounting portion 10 of the relaxation member 9 is fitted (press-fitted) to the outer peripheral portion of one end portion (right side in the drawing) of the metal pipe 7. Here, as shown in FIG. 4 (enlarged view indicated by an arrow B in FIG. 3), a groove 12 formed by cutting is provided on the outer peripheral surface of the metal pipe 7, and FIG.
The middle left portion fits into the groove 12. That is, the metal pipe 7 and the rubber hose 8 are prevented from falling off by the groove 12.

Then, with the relaxation member 9 attached to the metal pipe 7, one end of the metal pipe 7 (right side in FIG. 2)
The rubber hose 8 is elastically deformed so as to cover the relaxing member 9 and fitted into the outer peripheral portion of the rubber hose 8. That is, the rubber hose 8 is pressed into the outer peripheral portion. Thereafter, the metal pipe 7 and the rubber hose 8 are firmly fixed by squeezing the cylindrical metal sleeve (made of aluminum) indicated by 13 in FIG. 2 from the outer peripheral side to the inner side.

The relaxing member 9 functions as follows. When the compressor 2 is driven, the refrigerant is turned into an arrow C in FIG.
The flow as shown by occurs. Looking at this refrigerant flow, the refrigerant flow is pulsating due to the discharge pulsation of the compressor 2, so that the refrigerant flow has a periodic behavior such as becoming stronger or weaker. When the flow of the refrigerant becomes strong, it hits the bent portion 11. Therefore, the bent portion 11 is elastically deformed in the direction E in FIG. 2 by the flow of the refrigerant, so that the energy of the refrigerant is reduced. In addition, since the plurality of bent portions 11 are formed at intervals, the bent portions 11 are easily elastically deformed without greatly reducing the cross-sectional area of the refrigerant flow path, and the energy of the refrigerant is favorably absorbed and reduced. Can be done.

Thus, the discharge pulsation of the compressor can be reduced, and the vibration of the high pressure pipe can be reduced. As a result, vibration of the condenser 3 and other piping can be reduced, vibration of the vehicle body can be reduced, and finally, noise in the vehicle compartment can be reduced. In this example, since the mitigation member 9 is provided in the high-pressure pipe, the reduction mechanism for significantly reducing the discharge pulsation can be made more compact than before.

Further, in this embodiment, since the relaxation member 9 is attached only by being fitted to the outer peripheral surface of the metal pipe 7,
It is not necessary to attach a muffler by brazing as in the conventional case, and a mechanism for reducing the discharge pulsation can be simply attached. (Modification) In the above embodiment, the relief member 9 is provided on the compressor 2 side of the rubber hose 8, but may be provided, for example, at a connection portion between the other end of the rubber hose 8 on the right side in FIG.

It goes without saying that the materials of the above-mentioned components are not limited.

[Brief description of the drawings]

FIG. 1 is a vehicle layout diagram of a refrigeration cycle according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the high-pressure pipe 6 in the embodiment.

FIG. 3 is a view taken in the direction of arrow A in FIG. 2;

FIG. 4 is an enlarged view of a portion indicated by B in FIG. 2;

[Description of Signs] 1 Refrigeration cycle, 2 Compressor, 3 Condenser, 7 Metal pipe, 8 Rubber hose, 9 Relief member, 1
0: mounting part, 11: bending part.

Claims (3)

[Claims] 1. A refrigeration cycle (1) mounted on a vehicle, which is provided between a compressor (2) for compressing and discharging a refrigerant and a condenser (3) for condensing and liquefying the refrigerant,
A refrigerant pipe forming a refrigerant flow path, wherein the metal pipe part (7) constituting the refrigerant flow path is fitted into an outer peripheral portion of one end of the metal pipe part (7);
A hose section (8) formed of an elastically deformable material, provided at one end of the metal pipe section (7), formed of an elastically deformable material and inward of the refrigerant passage. A refrigerant pipe provided with a relaxation member (9) protruding from the refrigerant pipe. 2. The mounting member (1), wherein the relaxing member (9) is formed in a cylindrical shape, and one end side is fitted and mounted on an outer peripheral portion of one end of the metal pipe portion.
0), and the hose section (8) at the other end of the mounting section (10).
The refrigerant pipe according to claim 1, wherein a side is bent so as to protrude inward. 3. The refrigerant pipe according to claim 1, wherein a plurality of the relief members are provided at intervals along an inner surface of the refrigerant flow path.