JP3908009B2 - Vehicle cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle cooling device for a so-called idle stop vehicle or a hybrid vehicle in which an engine is stopped in accordance with a traveling state of the vehicle.
[0002]
[Prior art]
In recent years, there have been examples where so-called idle stop vehicles and hybrid vehicles are introduced into the market from the viewpoint of fuel saving. In these vehicles, the engine is stopped according to the running state (temporarily stopped for idle stop vehicles, temporarily stopped for hybrid vehicles, when starting, running at low speed, etc.). The compressor for the air conditioner that operates in response to the operation is also stopped, and the air conditioner is not operated while the engine is stopped.
[0003]
As a solution for this, for example, in JP 2000-127753 A, a second compressor that operates by receiving the driving force of a motor is provided separately from a compressor that is operated by an engine (the first compressor in the publication), While the engine is stopped, the cooling device is continuously operated by the second compressor.
[0004]
[Problems to be solved by the invention]
However, in the embodiment of the above publication, since the second compressor and the motor are formed as separate bodies and are set to be operated via pulleys and a belt, a large mounting space is required. In addition, since the second compressor and the motor are of an open type in which one end side of the shaft is opened to the outside, in order to prevent leakage of internal refrigerant and lubricating oil and to ensure reliability, a shaft sealing device is used. It is necessary to provide it.
[0005]
In view of the above problems, an object of the present invention is to provide a vehicular cooling device that is excellent in mountability and can ensure reliability against leakage of refrigerant and lubricating oil without requiring a shaft sealing device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following technical means.
[0009]
By the way, in the above-mentioned prior art, since the second compressor is connected to the compressor (first compressor) so as to be arranged in parallel, the piping operation becomes complicated, and the pipe connecting portion It was necessary to give due consideration to leakage of refrigerant and lubricating oil.
[0010]
The invention according to claim 1 is applied to a vehicle in which the engine (10) is stopped according to the traveling state, and is operated by receiving the driving force of the engine (10) to compress the refrigerant. A cooling device (110) provided with a condenser (112) for condensing refrigerant from the compressor (111), and a compressor unit (220) for compressing refrigerant by driving a motor unit (210) In the vehicle air conditioner in which the electric compressor (200) is operated when the engine (10) is stopped when the air conditioner (110) is operated, the electric compressor (200) is provided with the electric compressor (200). machine (200) includes a motor section including a rotating shaft (213, 223) (210) and a compressor portion (220) is of the closed type for accommodating integrally with the sealed housing (230) within the compressor (111) vs. It is arranged between the series and so as the compressor (111) and a condenser (112) Te, the electric compressor (200), bypassing the compressor section (220) from the suction side of the compressor unit (220) A bypass flow path (235), and a check valve (236) that is disposed in the bypass flow path (235) and that opens the bypass flow path (235) by the discharge pressure of the compressor (111), The compressor (111) is characterized by being a piston type compressor having a suction valve (111a) and a discharge valve (111b).
[0011]
Thereby, a motor part (210) and a compressor part (220) are integrally formed, and it can be set as the electric compressor (200) excellent in mountability. Moreover, since the internal housing and the rotating shafts (213, 223) of the compressor unit (220) and the internal coolant and lubricating oil are enclosed by the hermetic housing (230), the shaft sealing device is not required and the coolant and lubrication are eliminated. Reliability against oil leakage can be ensured. In addition, the piping operation of the electric compressor (200) is simplified, the reliability against leakage is further improved, and the cost can be reduced.
[0012]
That is, a check valve (236) is provided in the bypass flow path (235) of the electric compressor (200), and the compressor (111) is a piston-type compressor. When the compressor section (220) is operated, the refrigerant can be sucked through the suction valve (111a) and the discharge valve (111b) of the compressor (111), and both compressors (111 , 200), and the electric compressor (200) can be arranged in series on the condenser (112) side of the compressor (111). Therefore, the refrigerant pipe (115a) used at the time of parallel arrangement can be made unnecessary, and since the connection portion is reduced, the concern about leakage is reduced, and the cost of the refrigerant pipe (115a) can be reduced.
[0013]
The invention according to claim 2 is characterized in that the compressor (111) is a multi-cylinder piston type compressor having a plurality of pistons (111f).
[0014]
Thereby, since the flow path which distribute | circulates the compressor (111) at the time of a compressor part (220) action | operation can be increased, the distribution resistance of a refrigerant | coolant can be reduced.
[0015]
Further, the invention according to claim 3 is characterized in that a refrigerant flows through the motor section (210).
[0016]
Thereby, the cooling effect to the motor part (210) by a refrigerant | coolant is acquired, and the lifetime improvement or size reduction of a motor part (210) is attained.
[0017]
The invention according to claim 4 is characterized in that the maximum capacity of the compressor section (220) is made smaller than the maximum capacity of the compressor (111).
[0018]
As a result, the electric compressor (200) can be further downsized. This is because, unlike the compressor (111), the electric compressor (200) only needs to have a capacity setting sufficient to satisfy the cooling function while the engine (10) is stopped.
[0019]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description mentioned later.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment of the present invention is shown in FIG. 1 and FIG. The vehicle cooling device 100 according to the first embodiment is applied to a so-called idle stop vehicle in which the engine 10 is stopped when the vehicle is temporarily stopped during traveling, and includes a cooling device 110, a control device 120, and an electric compressor 200. .
[0021]
As shown in FIG. 1, the cooling device 110 forms a known refrigeration cycle, and a compressor 111 that compresses the refrigerant in the refrigeration cycle to high temperature and high pressure, a condenser 112 that liquefies and condenses the compressed refrigerant, An expansion valve 113 that adiabatically expands the liquefied refrigerant and an evaporator 114 that evaporates the expanded refrigerant and cools the air passing through the evaporation latent heat are sequentially connected by a refrigerant pipe 115 made of rubber or metal. . The compressor 111 operates the driving force of the engine 10 via a pulley and a pulley belt. In addition, the compressor 111 and the condenser 112 are arrange | positioned in the engine room 1a, and the expansion valve 113 and the evaporator 114 are arrange | positioned in the instrument panel of a vehicle interior as a component of the air conditioning unit 110a.
[0022]
The air conditioning unit 110a is provided with a control device 120. The control device 120 performs various controls of the cooling device 110 and controls the operation of a motor unit 210 of the electric compressor 200 described later. Specifically, the motor unit 210 is turned on and off based on signals from various sensors (not shown), that is, vehicle speed, engine speed, evaporator rear temperature, vehicle interior temperature, A / C request signal, and the like.
[0023]
Next, the configuration of the electric compressor 200 will be described with reference to FIG. The electric compressor 200 includes a rotating shaft 213, an eccentric shaft (the rotating shaft in the claims) in a sealed housing 230 formed of a first housing 231 that forms a cylindrical half container and a second housing 232 that forms a lid-like member. The motor unit 210 including the 223 and the compressor unit 220 are integrally sealed.
[0024]
The motor unit 210 is provided with a rotor 214 and a stator 215 in a first housing 231, and a rotating shaft 213 that passes through the rotor 214 is supported by bearings 216 and 217, and the stator 215 is energized to rotate. This is a well-known brushless motor.
[0025]
Here, the compressor unit 220 is a rolling piston compressor, and is provided with a rotor 224 that is revolved in the compression chamber 226 by an eccentric shaft 223, and a compressed refrigerant is discharged below the compression chamber 226. A discharge chamber 227 is formed. A suction port 233 communicating with the inside of the compression chamber 226 is welded to the lower side of the first housing 231, and a discharge port communicating with the space in which the motor unit 210 is accommodated is located above the second housing. 234 is welded and provided. Further, a communication hole 228 that communicates from the discharge chamber 227 to the space in which the motor unit 210 is accommodated is provided, and the refrigerant sucked from the suction port 233 is communicated with the discharge chamber 227 after being compressed in the compression chamber 226. After flowing through the motor part 210 through the hole 228, the ink is discharged from the discharge port 234.
[0026]
The rotating shaft 213 of the motor unit 210 and one end side of the eccentric shaft 223 of the compressor unit 220 facing each other are coupled to each other. The motor unit 210 and the compressor unit 220 including the rotating shaft 213 and the eccentric shaft 223 are hermetically sealed. After being housed in 230, the first and second housings 231 and 232 are welded together to form a hermetic electric compressor 200. Here, as the maximum capacity (discharge pressure, discharge capacity, etc.) of the compressor unit 220 in the electric compressor 200, it is sufficient to set the capacity so as to satisfy the cooling function while the engine 10 is stopped as an idle stop vehicle. The maximum capacity (discharge pressure, discharge capacity, etc.) of the compressor 111 in the cooling device 110 is set to be smaller.
[0027]
The electric compressor 200 formed in this way is mounted in the engine room 1a in FIG. 1 via a mounting bracket 116 and is arranged in parallel with the compressor 111 in the cooling device 110, that is, the compressor 111. The suction side and the discharge side are connected by a refrigerant pipe 115a.
[0028]
The vehicle cooling device 100 configured as described above performs a cooling function when the vehicle travels, that is, when the engine 10 is operating, the compressor 111 is operated by the driving force of the engine 10. That is, the refrigerant is compressed by the compressor 111, and the compressed refrigerant is subsequently condensed and liquefied, adiabatically expanded and evaporated by the condenser 112, the expansion valve 113, and the evaporator 114, and the air passing through the evaporator 114 is evaporated to latent heat. To cool.
[0029]
However, since the applicable vehicle is an idle stop vehicle, the engine 10 is stopped when the vehicle is temporarily stopped, and the compressor 111 using the engine 10 as a drive source is not operated. Therefore, the electric compressor 200 is operated by the control device 120. The cooling function can be continued.
[0030]
In the present embodiment, since the motor unit 210 and the compressor unit 220 are integrally formed, the electric compressor 200 having excellent mountability can be obtained. Further, as the hermetic electric compressor 200, the hermetic housing 230 encloses the refrigerant and lubricating oil inside the motor 210 and the rotating shaft 213 and the eccentric shaft 223 of the compressor unit 220, so that the shaft sealing device is not necessary and the refrigerant. And reliability against leakage of lubricating oil can be secured.
[0031]
Furthermore, since the refrigerant flows through the motor unit 210 in the hermetic housing 230, the cooling effect of the refrigerant on the motor unit 210 can be obtained, and the life of the motor unit 210 can be improved or downsized.
[0032]
Further, considering the application to the idle stop vehicle, the maximum capacity of the compressor unit 220 is set to be smaller than that of the compressor 111, so that the electric compressor 200 can be further downsized.
[0033]
(Second Embodiment)
A second embodiment of the present invention is shown in FIGS. In the second embodiment, the arrangement layout of the electric compressor 200 is changed with respect to the first embodiment to simplify the connection piping.
[0034]
First, as shown in FIG. 3, the electric compressor 200 is arranged in series with the compressor 111, that is, between the compressor 111 and the condenser 112.
[0035]
As shown in FIG. 4, the electric compressor 200 is provided with a bypass channel 235 that bypasses the compressor unit 220. Specifically, the bypass channel 235 is a channel that communicates from the suction side of the compressor unit 220 to the space in which the motor unit 210 is accommodated.
[0036]
Further, a ball-like check valve 236 is provided in the bypass channel 235. The check valve 236 is normally urged by a spring member 237 to close the bypass passage 235, and is pushed up by the refrigerant discharge pressure from the compressor 111 to open the bypass passage 235. ing.
[0037]
On the other hand, as shown in FIG. 5, the compressor 111 is a piston type compressor that sucks and compresses refrigerant from the suction chamber 111c by a piston 111f reciprocating in a cylinder 111e, and discharges the refrigerant into the discharge chamber 111d. It is a multi-cylinder piston type (not shown) provided with a plurality of pistons 111f. As a matter of course, as a piston type compressor, each cylinder 111e is provided with a suction valve 111a and a discharge valve 111b, and is formed between the cylinder 111e when the piston 111f is at the top dead center position. It has a cylinder gap (cylinder gap volume) 111g.
[0038]
Next, the operation based on the above configuration will be described. First, when the compressor 111 is operated by the engine 10, the compressor 111 compresses the refrigerant and discharges the refrigerant to the electric compressor 200 side. At this time, the check valve 236 is pushed up by the discharge pressure of the refrigerant to open the bypass channel 235, and the refrigerant flows through the motor unit 210 and is discharged from the discharge port 234 (solid line in FIG. 4). That is, the refrigerant can pass through the inactive electric compressor 200.
[0039]
On the other hand, when the engine 10 is stopped and the compressor 111 is stopped, the electric compressor 200 is operated (the motor unit 210 is turned on by the control device 120 using the battery 11 as a power source). The check valve 236 in the electric compressor 200 is positioned on the refrigerant suction side and holds the bypass flow path 235 closed by the urging force of the spring member 237. After being compressed, the refrigerant flows through the motor unit 210 and is discharged from the discharge port 234. At this time, there is at least a space (cylinder gap volume) by the cylinder gap 111g in the cylinder 111e of the compressor 111 depending on the stop position of each piston 111f, and the refrigerant is changed according to the operation of the electric compressor 200. When it starts to flow, a pressure difference is generated between the upstream side and the downstream side of the intake valve 111a and the discharge valve 111b, so that both valves 111a and 111b operate in the valve opening direction. Then, the refrigerant flows through the suction chamber 111c, the suction valve 111a, the cylinder gap 111g, the discharge valve 111b, and the discharge chamber 111d in this order and is sucked into the electric compressor 200 (broken line in FIGS. 4 and 5). That is, the refrigerant can pass through the inactive compressor 111.
[0040]
As a result, similar to the first embodiment, it is possible to improve the mountability of the electric compressor 200, and to ensure the reliability against leakage of refrigerant and lubricating oil without a shaft sealing device. In addition, the electric compressor 200 This simplifies the piping operation, improves the reliability against leakage, and enables cost reduction.
[0041]
That is, by providing a check valve 236 in the bypass flow path 235 of the electric compressor 200 and using the compressor 111 as a piston type compressor, the refrigerant flows to the bypass flow path 235 side when the compressor 111 is operated. When the compressor unit 220 is in operation, the refrigerant can be sucked through the suction valve 111a and the discharge valve 111b of the compressor 111, and the compressors 111 and 200 can be used properly. The electric compressor 200 is connected to the condenser 112 side of the compressor 111. Can be arranged in series. Therefore, the refrigerant piping 115a used at the time of parallel arrangement can be made unnecessary, and since the connection portion is reduced, the concern about leakage is reduced, and the cost for the refrigerant piping 115a can be reduced.
[0042]
Further, since the compressor 111 is a multi-cylinder piston type compressor having a plurality of pistons 111f, the flow path through the compressor 111 when the compressor unit 220 is operated can be increased, and the flow resistance of the refrigerant Can be reduced.
[0043]
The number of pistons 111f of the compressor 111 is not limited to a plurality, and may be a single.
[0044]
(Other embodiments)
The above embodiment has been described as a vehicle cooling device applied to an idle stop vehicle. However, the present invention is applied to a hybrid vehicle in which an engine and a vehicle motor are used as drive sources and the engine is stopped (traveled by a vehicle motor) in accordance with a traveling state. Also good.
[0045]
In addition, the compressor unit 220 of the electric compressor 200 has been described as a rolling piston type, but is not limited thereto, and may be a swash plate type variable capacity type, a scroll type, or the like.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of a vehicle cooling device according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the entire electric compressor in FIG.
FIG. 3 is a schematic diagram showing an overall configuration of a vehicle cooling device according to a second embodiment of the present invention.
4 is a schematic diagram showing the flow of refrigerant in the compressor and the electric compressor in FIG. 3. FIG.
FIG. 5 is a schematic diagram showing a refrigerant flow of the compressor in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Engine 100 Vehicle cooling device 110 Cooling device 111 Compressor 111a Intake valve 111b Discharge valve 111f Piston 112 Condenser 200 Electric compressor 210 Motor part 213 Rotating shaft 223 Eccentric shaft (Rotating shaft)
220 Compressor 230 Sealed Housing 235 Bypass Channel 236 Check Valve

Claims (4)

It is applied to a vehicle in which the engine (10) is stopped according to the running state,
The air conditioner (110) provided with a compressor (111) that operates under the driving force of the engine (10) and compresses the refrigerant, and a condenser (112) that condenses the refrigerant from the compressor (111). )When,
An electric compressor (200) provided with a compressor part (220) for compressing the refrigerant by driving the motor part (210),
In the vehicle cooling device in which the electric compressor (200) is operated when the engine (10) is stopped when the cooling device (110) is operated,
The electric compressor (200) is a hermetically sealed type that integrally accommodates the motor part (210) including the rotating shaft (213, 223) and the compressor part (220) in a hermetically sealed housing (230). And arranged between the compressor (111) and the condenser (112) so as to be in series with the compressor (111),
The electric compressor (200) includes a bypass passage (235) that bypasses the compressor part (220) from the suction side of the compressor part (220),
A check valve (236) disposed in the bypass flow path (235) and opening the bypass flow path (235) by a discharge pressure of the compressor (111);
The air conditioner for a vehicle, wherein the compressor (111) is a piston type compressor having a suction valve (111a) and a discharge valve (111b). The vehicle air conditioner according to claim 1 , wherein the compressor (111) is a multi-cylinder piston type compressor having a plurality of pistons (111f). The vehicle air conditioner according to claim 1 or 2 , wherein the refrigerant flows through the motor unit (210). The vehicle cooling device according to any one of claims 1 to 3 , wherein a maximum capacity of the compressor section (220) is made smaller than a maximum capacity of the compressor (111). .

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