JP2004232891A - Vapor compression type refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of piping and the number of joints joining the piping in a vapor compression type refrigerating machine. <P>SOLUTION: Refrigerant piping connected to an intake side of a compressor 1 and the refrigerant piping connected to an outlet side of the compressor 1 are integrated, the refrigerant piping connected to an inflow port side of a radiator 2 and the refrigerant piping connected to an outflow port side of the radiator 2 are integrated, and the refrigerant piping connected to the inflow port side of a decompressor 3 and the refrigerant piping connected to the outflow port side of a temperature sensing part are integrated. Thus, the number of the piping and the number of joints joining the piping can be reduced. Accordingly, an assembling man-hour for assembling the refrigerant piping can be reduced, and as the arrangement of the piping is simplified, the mountability of the vapor compression type refrigerating machine (an air conditioner) on a vehicle can be improved. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vapor compression refrigerator, and is effective when applied to a vapor compression refrigerator (vehicle air conditioner) for a vehicle.
[0002]
[Prior art]
In a conventional vapor compression refrigerator, a rubber refrigerant pipe connected to the suction side of the compressor and a rubber refrigerant pipe connected to the discharge side of the compressor are integrated as a double cylinder ( For example, see Patent Document 1).
[0003]
There is also an invention in which a high-pressure refrigerant passage leading to a compressor, a condenser and an evaporator is integrated with a low-pressure refrigerant passage (for example, see Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent No. 2595578 [0005]
[Patent Document 2]
JP 2001-277842 A
[Problems to be solved by the invention]
However, in the invention described in Patent Literature 1, since only the pipes connected to the compressor are integrated, it is difficult to further reduce the number of pipes and the number of joints connecting the pipes.
[0007]
Further, in the invention described in Patent Document 2, since the high-pressure medium passage and the low-pressure passage are integrated, the refrigerant flowing out of the evaporator must return to the compressor via the condenser. For this reason, the length of the low-pressure passage is increased by the length of the condenser, so that the pressure loss of the refrigerant is increased and the power consumption of the compressor is likely to increase.
[0008]
In view of the above points, the present invention firstly provides a new vapor compression refrigerator different from the conventional one, and secondly, aims to further reduce the number of pipes and the number of joints connecting the pipes. I do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a compressor (1) that sucks and compresses a refrigerant, a radiator (2) that cools a high-pressure refrigerant, and a decompression unit ( 3) a vapor compression refrigerator having an evaporator (4) for evaporating a low-pressure refrigerant and transferring low-temperature heat to a high-temperature refrigerant, wherein the refrigerant is connected to a suction side of the compressor (1). The pipe and the refrigerant pipe connected to the discharge side of the compressor (1) are integrated, and further, the refrigerant pipe connected to the inlet side of the radiator (2) and the refrigerant pipe connected to the outlet side of the radiator (2). The refrigerant pipe to be connected is integrated.
[0010]
Thereby, the number of pipes and the number of joints connecting the pipes can be reduced as compared with Patent Document 1.
[0011]
Therefore, the number of assembling steps for assembling the refrigerant pipes can be reduced, and the piping arrangement can be simplified, so that the mountability of the vapor compression refrigerator to the vehicle can be improved.
[0012]
According to the second aspect of the present invention, the pressure reducing means (3) includes a variable throttle unit that adjusts the throttle opening based on the refrigerant superheat degree at the outlet side of the evaporator (4) and a temperature sensing unit that detects the refrigerant superheat degree. And a refrigerant pipe connected to the inflow side of the pressure reducing means (3) and a refrigerant pipe connected to the outflow side of the temperature sensing part are integrated. It is characterized by having.
[0013]
In the invention according to claim 3, the refrigerant pipe connected to the discharge side of the compressor (1) is connected to the refrigerant pipe connected to the inflow side of the radiator (2), and the radiator (2) is connected. ), A refrigerant pipe connected to the refrigerant pipe connected to the inlet side of the pressure-reducing means (3) and a refrigerant pipe connected to the outlet side of the temperature-sensitive part, and a compressor. (1) An intermediate joint (8) for connecting to a refrigerant pipe connected to the suction side.
[0014]
Thus, unlike the invention described in Patent Document 2, the low-pressure refrigerant flowing out of the evaporator (4) returns to the compressor (1) without passing through the radiator (2). Therefore, the length of the low-pressure passage can be made shorter than that of the invention described in Patent Document 2, so that the pressure loss of the refrigerant can be reduced, and the power consumption of the compressor (1) can be prevented from increasing.
[0015]
According to the fourth aspect of the present invention, the evaporator (4) is composed of first and second evaporators (4a, 4b), and the pressure reducing means (3) is a first evaporator (4a) for the first evaporator (4a). It comprises a pressure reducing means (3a) and a second pressure reducing means (3b) for the second evaporator (4b), and further comprises a refrigerant pipe connected to the outlet side of the radiator (2) and a first pressure reducing means. The refrigerant pipe connected to the inlet side of the means (3a) is connected to the refrigerant pipe connected to the outlet side of the radiator (2), and the refrigerant pipe connected to the inlet side of the second decompression means (3b). And the refrigerant pipe connected to the outlet side of the temperature sensing part of the first pressure reducing means (3a) and the refrigerant pipe connected to the suction side of the compressor (1). In addition, the refrigerant pipe connected to the outlet of the temperature sensing part of the second pressure reducing means (3b) is connected to the refrigerant pipe connected to the suction side of the compressor (1). It is characterized in that it has a second intermediate joint (9) to.
[0016]
The invention according to claim 5 is characterized in that the pipe in which the two types of refrigerant pipes are integrated is integrally formed by extrusion or drawing.
[0017]
The invention according to claim 6 is characterized in that a pipe length from the intermediate joint (8) to the radiator (2) is shorter than a pipe length from the intermediate joint (8) to the pressure reducing means (3).
[0018]
Thus, heat exchange between the refrigerant flowing out of the radiator (2) and the refrigerant flowing into the radiator (2) can be suppressed, so that the enthalpy of the refrigerant flowing into the evaporator (4) increases, and It is possible to suppress the endothermic ability of (4) from decreasing.
[0019]
Incidentally, reference numerals in parentheses of the above-mentioned units are examples showing the correspondence with specific units described in the embodiments described later.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
In this embodiment, a vapor compression refrigerator according to the present invention is applied to a vehicle air conditioner, and FIG. 1 is a schematic diagram of a vehicle air conditioner.
[0021]
In FIG. 1, a compressor 1 sucks and compresses a refrigerant. In the present embodiment, the compressor 1 is mounted on a traveling engine and operates by receiving power from the engine. The radiator 2 is a high-pressure heat exchanger that exchanges heat between the high-pressure refrigerant discharged from the compressor 1 and outdoor air to cool the high-pressure refrigerant.
[0022]
In this embodiment, since the pressure of the high-pressure refrigerant is lower than the critical pressure of the refrigerant, the radiator 2 lowers the enthalpy of the refrigerant while changing its phase from a gas-phase refrigerant to a liquid-phase refrigerant.
[0023]
Further, the decompressor 3 is a decompression means for decompressing the high-pressure refrigerant. In the present embodiment, the depressurizer 3 detects a variable throttle portion for adjusting the throttle opening based on the refrigerant superheat degree on the outlet side of the evaporator 4 and detects the refrigerant superheat degree. It employs a temperature-type expansion valve integrated with a temperature sensing part.
[0024]
The evaporator 4 is a low-pressure side heat exchanger that evaporates a low-pressure liquid-phase refrigerant. In this embodiment, the evaporator 4 absorbs heat from the air that blows into the room and evaporates the refrigerant to cool the air that blows into the room. The absorbed heat is radiated to the outside of the room by the radiator 2. On the contrary, even if the room is heated by absorbing the heat from the outdoor air and radiating the absorbed heat to the air blown into the room. Good.
[0025]
A refrigerant pipe connected to the suction side of the compressor 1 and a refrigerant pipe connected to the discharge side of the compressor 1 are integrated to form a compressor pipe 5, which is connected to the inflow side of the radiator 2. And a refrigerant pipe connected to the outlet side of the radiator 2 are integrated to form a radiator pipe 6. The refrigerant pipe connected to the inlet side of the pressure reducer 3 and the refrigerant pipe The refrigerant pipe connected to the outlet side is integrated with the pressure reducing pipe 7.
[0026]
As shown in FIG. 2A or 2B, the radiator pipe 6 and the pressure reducer pipe 7 are formed into a double cylindrical shape by extruding or drawing a metal material such as an aluminum alloy. The compressor pipe 5 has a double cylindrical shape made of a flexible pipe material such as rubber.
[0027]
Incidentally, in the compressor pipe 5, the inner cylinder side is connected to the discharge side of the compressor 1, the outer cylinder side is connected to the suction side of the compressor 1, and in the radiator pipe 6, as shown in FIG. 4 is connected to the outlet side of the radiator 2, the outer cylinder side is connected to the inflow side of the radiator 2, and in the pressure reducer pipe 7, the inner cylinder side is connected to the inlet side of the pressure reducer 3 as shown in FIG. The outer cylinder side is connected to the outlet side of the temperature sensing part.
[0028]
The intermediate joint 8 connects the compressor pipe 5, the radiator pipe 6, and the decompressor pipe 7 to connect the refrigerant pipe connected to the discharge side of the compressor 1 and the radiator 2 as shown in FIG. And a refrigerant pipe connected to the outlet side of the radiator 2 and a refrigerant pipe connected to the inlet side of the pressure reducer 3, and The refrigerant pipe connected to the outlet side of the temperature sensing part and the refrigerant pipe connected to the suction side of the compressor 1 are connected.
[0029]
Next, the operation and effect of the present embodiment will be described.
[0030]
The operation of the vapor compression refrigerator (air conditioner) is the same as that of the well-known vapor compression refrigerator (air conditioner), and the description of the operation of the vapor compression refrigerator (air conditioner) will be omitted.
[0031]
In the present embodiment, the refrigerant pipe connected to the suction side of the compressor 1 and the refrigerant pipe connected to the discharge side of the compressor 1 are integrated, and the refrigerant connected to the inflow side of the radiator 2 The pipe and the refrigerant pipe connected to the outlet side of the radiator 2 are integrated, and the refrigerant pipe connected to the inlet side of the pressure reducer 3 and the refrigerant pipe connected to the outlet side of the temperature sensing unit. Are integrated, the number of pipes and the number of joints connecting the pipes can be reduced as compared with Patent Document 1.
[0032]
Therefore, the number of assembling steps for assembling the refrigerant pipes can be reduced, and the piping arrangement can be simplified, so that the mountability of the vapor compression refrigerator (air conditioner) on the vehicle can be improved.
[0033]
Further, in the present embodiment, since the compressor pipe 5, the radiator pipe 6, and the pressure reducer pipe 7 are connected via the intermediate joint 8, unlike the invention described in Patent Literature 2, it flows out of the evaporator 4. The low-pressure refrigerant returns to the compressor 1 without passing through the radiator 2. Therefore, since the length of the low-pressure passage can be made shorter than that of the invention described in Patent Document 2, the pressure loss of the refrigerant can be reduced, and the power consumption of the compressor 1 can be prevented from increasing.
[0034]
By the way, in this embodiment, since two types of pipes are integrated, there is a possibility that heat exchange may occur between the refrigerant flowing through these two types of pipes. At this time, even if heat is exchanged between the low-pressure refrigerant and the high-pressure refrigerant in the compressor pipe 5 and the decompressor pipe 7, the operation is the same as that of the well-known internal heat exchanger. When the refrigerant flowing out of the radiator 2 and the refrigerant flowing into the radiator 2 exchange heat in the heat pipe 6, the enthalpy of the refrigerant flowing into the evaporator 4 increases, and the heat absorbing ability of the evaporator 4 may decrease. There is.
[0035]
Therefore, in the present embodiment, the length of the radiator pipe 6 from the intermediate joint 8 to the radiator 2 is made shorter than the length of the pressure reducer pipe 7 from the intermediate joint 8 to the pressure reducer 3, and the heat is radiated by the radiator pipe 6. The amount of heat exchange between the refrigerant flowing out of the vessel 2 and the refrigerant flowing into the radiator 2 is suppressed.
[0036]
(2nd Embodiment)
In the present embodiment, as shown in FIG. 6, the present invention is applied to an air conditioner having two evaporators, that is, a front seat evaporator 4a and a rear seat evaporator 4b.
[0037]
In this embodiment, a first decompressor 3a for the front seat evaporator 4a and a second decompressor 3b for the rear seat evaporator 4b are provided, and the flow of the radiator 2 as shown in FIG. The refrigerant pipe connected to the outlet side and the refrigerant pipe connected to the inlet side of the first decompressor 3a, and the refrigerant pipe connected to the outlet side of the radiator 2 and the second decompressor 3b And a refrigerant pipe connected to the outlet side of the temperature-sensitive part of the first decompressor 3a and a refrigerant pipe connected to the suction side of the compressor 1. And a second intermediate joint 9 for connecting a refrigerant pipe connected to the outlet side of the temperature sensing part of the second decompressor 3b and a refrigerant pipe connected to the suction side of the compressor 1. It is a thing.
[0038]
(Third embodiment)
In the above-described embodiment, the compressor pipe 5, the radiator pipe 6, and the pressure reducer pipe 7 have a double cylindrical shape. However, in the present invention, as shown in FIG. 8, two pipes are arranged in parallel and integrated. Things.
[0039]
In the integration, not only the extrusion process or the drawing process, but also the two may be manufactured separately and then integrated by mechanical means such as welding, brazing, or a binding band.
[0040]
(Other embodiments)
In the above embodiment, the compressor pipe 5 is made of rubber to exhibit flexibility. However, the present invention is not limited to this. For example, the inner pipe and the outer pipe of the compressor pipe 5 may be used. May be made bellows-like to exhibit flexibility. In this case, the inner cylinder and the outer cylinder of the compressor pipe 5 may be made of metal.
[0041]
Further, in the above-described embodiment, as the depressurizer 3, the variable throttle unit for adjusting the throttle opening based on the refrigerant superheat degree at the outlet side of the evaporator 4 and the temperature sensing unit for detecting the refrigerant superheat degree are integrated. Although a temperature type expansion valve is employed, the present invention is not limited to this.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a vehicle air conditioner according to a first embodiment of the present invention.
FIG. 2 is a sectional view of a refrigerant pipe according to the first embodiment of the present invention.
FIG. 3 is an explanatory view showing a connection portion of a refrigerant pipe according to the embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a connection portion of a refrigerant pipe according to the embodiment of the present invention.
FIG. 5 is an explanatory diagram of an intermediate joint according to the embodiment of the present invention.
FIG. 6 is a schematic diagram of a vehicle air conditioner according to a second embodiment of the present invention.
FIG. 7 is an explanatory diagram of an intermediate joint according to a second embodiment of the present invention.
FIG. 8 is a sectional view of a refrigerant pipe according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... compressor, 2 ... radiator, 3 ... decompressor, 4 ... evaporator, 5 ... compressor piping,
6: radiator pipe, 7: pressure reducer pipe, 8: intermediate joint.

Claims (6)

It has a compressor (1) for sucking and compressing the refrigerant, a radiator (2) for cooling the high-pressure refrigerant, a pressure reducing means (3) for depressurizing the refrigerant, and an evaporator (4) for evaporating the low-pressure refrigerant. A vapor compression refrigerator for transferring heat to a high temperature side,
A refrigerant pipe connected to a suction side of the compressor (1) and a refrigerant pipe connected to a discharge side of the compressor (1) are integrated;
Furthermore, a refrigerant pipe connected to the inlet of the radiator (2) and a refrigerant pipe connected to the outlet of the radiator (2) are integrated with each other. refrigerator. In the pressure reducing means (3), a variable throttle portion for adjusting the throttle opening based on the refrigerant superheat degree on the outlet side of the evaporator (4) and a temperature sensing portion for detecting the refrigerant superheat degree are integrated. A thermal expansion valve,
The refrigerant pipe connected to the inlet side of the decompression means (3) and the refrigerant pipe connected to the outlet side of the temperature sensing part are integrated with each other. Steam compression refrigerator. A refrigerant pipe connected to the discharge side of the compressor (1) and a refrigerant pipe connected to the inlet side of the radiator (2) are connected to the outlet side of the radiator (2). A refrigerant pipe connected to a refrigerant pipe connected to an inlet side of the decompression means (3), and a refrigerant pipe connected to an outlet side of the temperature sensing part; and the compressor (1). The vapor compression refrigerator according to claim 2, further comprising an intermediate joint (8) for connecting a refrigerant pipe connected to a suction side of the refrigerator. The evaporator (4) includes first and second evaporators (4a, 4b),
The decompression means (3) comprises a first decompression means (3a) for the first evaporator (4a) and a second decompression means (3b) for the second evaporator (4b),
Further, a refrigerant pipe connected to an outlet of the radiator (2) is connected to a refrigerant pipe connected to an inlet of the first decompression means (3a), and the radiator (2) And a refrigerant pipe connected to the inlet side of the second pressure reducing means (3b), and connected to a refrigerant pipe connected to the inlet side of the second pressure reducing means (3b). The refrigerant pipe connected to the outlet side is connected to the refrigerant pipe connected to the suction side of the compressor (1), and is connected to the outlet side of the temperature sensing part of the second pressure reducing means (3b). 4. The vapor compression refrigerator according to claim 3, further comprising a second intermediate joint (9) connecting a refrigerant pipe connected to the refrigerant pipe and a refrigerant pipe connected to a suction side of the compressor (1). 5. The vapor compression according to any one of claims 1 to 4, wherein the pipe in which the two types of refrigerant pipes are integrated is integrally formed by extrusion or drawing. Type refrigerator. The pipe length from the intermediate joint (8) to the radiator (2) is shorter than the pipe length from the intermediate joint (8) to the pressure reducing means (3). A vapor compression refrigerator according to any one of the preceding claims.

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