JP2002174176A - Compressor, vehicle air conditioning circuit using compressor, manufacturing method of compressor and manufacturing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor doubly used for air-conditioning for cooling and heating free to rationally damp discharge pulsation. SOLUTION: A discharge chamber 55L formed of a rear housing 54L as a space for discharge of a high pressure refrigerant compressed in a compression space 32 separately from a motor chamber 48 to store an electric motor 46 on the scroll type electric compressor to be used for a vehicle air conditioning circuit doubly used for air-conditioning for cooling and heating free to change over to cooling driving and heating driving. Capacity of the discharge chamber 55L is set larger in comparison with capacity of the discharge chamber formed in case of using the compressor for the vehicle air-conditioning circuit special for cooling.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a compressor suitable for vehicle air conditioning, a vehicle air conditioning circuit using the compressor, and a method and system for manufacturing the compressor.

[0002]

2. Description of the Related Art As a vehicle air conditioning circuit, there are known a circuit exclusively used for cooling and a circuit used both for cooling and heating (with a heat pump) capable of switching between cooling operation and heating operation.
In a vehicle air-conditioning circuit that is also used for cooling and heating, an external condenser as an outdoor heat exchanger is disposed outdoors, and an evaporator and an indoor condenser as indoor heat exchangers are disposed indoors, and the evaporator operates during cooling operation. In the heating operation, the indoor condenser is operated. By the way, the compressor, which is a main component (drive source) of the vehicle air conditioning circuit, generates discharge pulsation at the time of operation thereof, and the discharge pulsation causes the condenser to vibrate, causing abnormal noise. In a vehicle air-conditioning circuit dedicated to cooling, since the condenser is placed outside the room, the generation of abnormal noise due to the vibration of the condenser does not cause much problem for the occupants, but the cooling and heating is configured so that the high-pressure refrigerant is guided to the indoor condenser. In a vehicle air conditioning circuit, abnormal noise is generated indoors,
This will cause discomfort to the occupants. As prior art,
For example, Japanese Patent Application Laid-Open No. 2000-12133 discloses a scroll-type electric compressor using an electric motor as a driving source.
It is described that high-pressure refrigerant compressed in a compression chamber is discharged to a motor chamber containing an electric motor.

[0003]

In the compressor described in the above publication, if the motor chamber has a sufficiently large space, the space can provide a function of damping discharge pulsation. Therefore, if this is applied to a vehicle air conditioning circuit for cooling and heating, it is possible to suppress the vibration of the indoor condenser and prevent the generation of abnormal noise. However, in the case of a configuration in which high-pressure refrigerant is discharged into the motor chamber, the temperature of the refrigerant changes because the electric motor during operation generates considerable heat. Such a change in the temperature of the refrigerant may adversely affect the cooling / heating capacity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a compressor and a compressor for a vehicle air conditioner capable of rationally attenuating discharge pulsation. It is an object of the present invention to provide a method and a system for manufacturing a vehicle air conditioning circuit and a compressor using the same.

[0005]

Means for Solving the Problems To achieve the above object, a compressor according to the present invention has a configuration as described in each of the claims. That is, according to the first aspect of the present invention, the capacity of the discharge chamber of the compressor used in the vehicle air-conditioning circuit that is used for both cooling and heating is set to be larger than the capacity of the discharge chamber of the compressor used in the vehicle air-conditioning circuit dedicated to cooling. are doing. Therefore, according to the first aspect of the present invention, the discharge pulsation of the compressor can be attenuated by the discharge chamber having a large volume during the operation of the vehicle air conditioning circuit that is also used for cooling and heating.
As a result, it is possible to suppress the vibration of the indoor capacitor and prevent the generation of abnormal noise.

According to the second aspect of the present invention, it is possible to provide a vehicle air conditioning circuit which is effective in attenuating discharge pulsation of the compressor and preventing generation of abnormal noise due to vibration of the indoor condenser. .

According to a third aspect of the present invention, there is provided a compressor having a discharge pulsation damping function suitable for use in a vehicle air-conditioning circuit which is also used for cooling and heating, on a production line. A suitable compressor applied to the vehicle air-conditioning circuit can be selectively and rationally manufactured. Further, according to the manufacturing system of the fourth aspect, in the assembling station, by the same method as the invention of the third aspect, a discharge pulsation damping function suitable for application to a vehicle air-conditioning circuit that is also used for cooling and heating is provided. And a compressor suitable for application to a vehicle air conditioning circuit dedicated to cooling can be selectively and rationally obtained.

[0008]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. The present embodiment is directed to a scroll-type electric compressor using an electric motor as a driving source. FIG. 1 is a cross-sectional view showing a scroll-type electric compressor used in a vehicle air-conditioning circuit that is also used for cooling and heating, and FIG. 2 is a cross-sectional view showing a scroll-type compressor used in a vehicle air-conditioning circuit dedicated to cooling. 3A and 3B are diagrams showing a vehicle air conditioning circuit that is also used for cooling and heating (with a heat pump), where (A) shows heating and (B) shows cooling. FIG. 4 is a diagram showing a vehicle air conditioning circuit dedicated to cooling.

As shown in FIG. 4, a vehicle air conditioning circuit dedicated to cooling includes a compressor A for sucking and compressing a gas refrigerant and discharging the gas refrigerant, and an outdoor unit for cooling with a surrounding air (or water) for condensing a high-pressure gas refrigerant. It comprises a condenser B as a heat exchanger, an evaporator C as an indoor heat exchanger for evaporating low-temperature liquid refrigerant and cooling the room, and an expansion valve D for controlling the flow rate of the refrigerant.

On the other hand, a vehicle air-conditioning circuit which is also used for cooling and heating is shown in FIG.
As shown in the figure, a compressor E, an indoor condenser F1 and an evaporator F2 as an indoor heat exchanger F, and an outdoor heat exchanger G
(Functioning as a condenser or an evaporator), and a pipe connecting the indoor condenser F1 and the outdoor heat exchanger G is provided with an expansion valve H and a switching valve I provided to bypass the expansion valve H, Further, a pipe connecting the outdoor heat exchanger G and the evaporator F2 is provided with an expansion valve J, and a switching valve K for short-circuiting the outdoor heat exchanger G to the suction side of the compressor E is provided upstream of the expansion valve J. It is provided with a configuration.

During the heating operation, the refrigerant discharged from the compressor E is supplied to the indoor condenser F1, the expansion valve H, the outdoor heat exchanger G, and the switching valve K as shown by arrows in FIG.
And returns to the compressor E via. At this time, the outdoor heat exchanger G functions as an evaporator. During the cooling operation, the refrigerant discharged from the compressor E passes through the indoor condenser F1, the switching valve I, the outdoor heat exchanger G, the expansion valve J, and the evaporator F2, as indicated by arrows in FIG. And returns to the compressor E. At this time, the outdoor heat exchanger G functions as a condenser.

By the way, during the operation of the vehicle air-conditioning circuit as described above, when discharge pulsation occurs in the compressors A and E, the discharge pulsation causes the condenser to vibrate and generate abnormal noise. Therefore, in the case of a vehicle air-conditioning circuit that is equipped with an indoor condenser and is used for both cooling and heating, the abnormal noise gives the occupant a feeling of discomfort. Therefore, in the present embodiment, in order to prevent the discharge pulsation of the compressor that causes the above-mentioned indoor condenser to vibrate, a discharge pulsation prevention measure is taken for the scroll type electric compressor. is there.

FIGS. 1 and 2 show a scroll type electric compressor.
It is configured as shown in FIG. Hereinafter, the configuration will be described. As shown, one end of a fixed housing 2 is joined to one end of a center housing 4, and the other end of the center housing 4 is joined to a motor housing 6. The fixed scroll 2 and the two housings 4 and 6 constitute a compressor body 7. A drive shaft 8 is rotatably supported by the center housing 4 and the motor housing 6 via radial bearings 10 and 12.
The eccentric shaft 14 is positioned at an eccentric position with respect to the drive shaft 8.
Are integrally formed.

A bush 16 is fitted on the eccentric shaft 14 so as to rotate integrally. A balance weight 18 is provided at one end of the bush 16 so as to rotate integrally with the bush 16, and a movable scroll 20 is relatively rotated via a needle bearing 22 at the other end of the bush 16 so that the movable scroll 20 faces the fixed scroll 2. Mated as possible. The needle bearing 22 is housed in a cylindrical boss portion 24 a protruding from the back surface of the movable scroll substrate 24 of the movable scroll 20.

Fixed scroll substrate 2 of fixed scroll 2
6, the fixed scroll wall 28, the movable scroll substrate 24 of the movable scroll 20, and the movable scroll wall 30
The movable spiral wall 30 contacts the plurality of points to form a crescent-shaped compression chamber (closed space) 32. A compression mechanism 21 is formed by the fixed scroll 2 and the movable scroll 20 described above.
Is configured. The orbiting scroll 20 orbits (orbits) with the rotation (orbits) of the eccentric shaft 14,
The balance weight 18 cancels the centrifugal force caused by the revolution of the movable scroll 20. The rotational force of the drive shaft 8 is applied to the movable scroll 20 by the eccentric shaft 14, the bush 16, which rotates integrally with the drive shaft 8, and the needle bearing 22 interposed between the eccentric shaft 14 and the boss 24 a of the movable scroll 20. An orbiting mechanism that transmits the orbital motion is configured.

On the end surface of the center housing 4, a plurality (for example, four) of recesses 34 for preventing rotation are formed at equal angular positions on the same circumferential line. A fixed pin 36 fixed to the center housing 4;
The movable pin 38 fixed to 4 is fastened while being inserted into the recess 34. The movable scroll 20 is prevented from rotating by the concave portion 34, the fixed pin 36, and the movable pin 38 with the rotation of the eccentric shaft 14. That is, the recess 34
The fixed pin 36 and the movable pin 38 constitute a rotation preventing mechanism of the movable scroll 20, and the movable scroll 20 revolves when the eccentric shaft 14 rotates. A stator 44 is fixed to the inner peripheral surface of the motor housing 6.
A rotor 45 is fixed to the drive shaft 8. Stator 4
An electric motor 46 is constituted by the rotor 4 and the rotor 45, and the rotor 45 and the drive shaft 8 rotate as a unit by energizing the stator 44. That is, the electric motor 46 is housed in a sealed motor room 48 formed by the motor housing 6 and the center housing 4.

As the eccentric shaft 14 of the drive shaft 8 rotates, the orbiting scroll 20 revolves, and the suction refrigerant introduced from the inlet 42 flows from the peripheral sides of the scrolls 2 and 20 to the fixed scroll substrate 26 and the orbiting scroll substrate. 24. At this time, with the rotation of the eccentric shaft 14, the orbiting scroll 20 tries to rotate around the central axis of the bush 16, but the rotation is prevented by the above-described rotation preventing mechanism. That is, when the eccentric shaft 14 rotates, the movable scroll 20 attached to the eccentric shaft 14 via the needle bearing 22 so as to be relatively rotatable revolves around the central axis of the drive shaft 8 without rotating. As the orbiting scroll 20 revolves, the suction refrigerant introduced from the inlet 42 flows into the compression chamber 32, and the compression chamber 32 moves to the inner circumference side while reducing the volume from the outer circumference side. Converge toward the inner peripheral ends of the spiral walls 28 and 30. The inlet 42 of the suction refrigerant is formed in the fixed scroll 2 and connected to an external suction pipe.

A discharge port 50 is formed at the center of the fixed scroll substrate 26, and the discharge port 50 communicates with the final compression chamber 32. A discharge valve 51 for opening and closing the discharge port 50 is provided on the back side of the fixed scroll substrate 26, and the discharge valve 51 includes a reed valve 52 and a retainer 5.
And 3.

On the rear side of the fixed scroll substrate 26, as shown in FIG. 2, a small rear housing is used for a compressor used for a vehicle air conditioning circuit exclusively used for cooling, as shown in FIG. 54S is assembled,
A compressor used in a vehicle air-conditioning circuit that also serves as
As shown in FIG. 1, a large rear housing 54L is assembled.
Thus, in the case of the compressor exclusively used for cooling, the discharge chamber 55S having a small capacity is formed, and in the case of the compressor serving as both cooling and heating, the discharge chamber 55L having a large capacity is formed. The outlets 54S1, 54L of the rear housings 54S, 54L.
An external discharge pipeline is connected to 54L1. The small rear housing 54S corresponds to the first housing according to the present invention, and the large rear housing 54L corresponds to the second housing according to the present invention.

As described above, in the present embodiment,
Regarding the scroll type electric compressor, discharge chambers 55S and 55L are provided separately from the motor chamber 48 accommodating the electric motor 46, and the volumes of the discharge chambers 55S and 55L are made different between the compressor only for cooling and the compressor for both cooling and heating. Things. That is, in the case of a compressor only for cooling that does not require the discharge chamber 55L having a large volume, the small rear housing 54S
Is assembled. Therefore, in this case, it is possible to provide a compact, easily mountable scroll-type electric compressor having a short shaft length (the length of the body in the axial direction). On the other hand, in the case of a cooling / heating compressor that requires a large discharge chamber 55L, a large rear housing 54L is assembled. Therefore, at this time, the discharge pulsation of the compressor during operation is attenuated by the discharge chamber 55L having a large volume. Therefore, when applied to a vehicle air-conditioning circuit that is also used for cooling and heating, it is possible to suppress vibration of the indoor condenser and prevent generation of abnormal noise. Here, a large capacity discharge chamber 55L formed by the large rear housing 54L.
Is a discharge chamber having a volume capable of obtaining a discharge pulsation damping effect, and is preferably set to, for example, about 4 to 5 times as compared with a compressor exclusively used for cooling. In addition, since the high-pressure discharge refrigerant does not pass through the motor chamber 48, that is, bypasses the motor chamber 48, the refrigerant is not affected by heat generated by the electric motor 46, so that the cooling and heating capacity can be stabilized.

In this embodiment, two types of large and small rear housings 54S and 54L having different sizes are prepared for the compressor for cooling only and the compressor for both cooling and heating in the scroll type electric compressor. Housing 5
All the components other than the 4S and 54L have the same specifications (same components), and the rear housings 54S and 54L are selectively used depending on whether the vehicle air conditioning circuit to be applied is exclusively for cooling or for both cooling and heating. That is, they are assigned separately. Thus, a compressor exclusively for cooling and a compressor for both cooling and heating can be rationally manufactured.

As a system for manufacturing the above-described compressor, the following configuration is proposed, although not shown for convenience. That is, in a compressor production line, for example, a transport conveyor for transporting the body of the compressor is provided, and two types of large and small rear housings 54S and 54L having different sizes are selectively supplied to a specific portion of the transport conveyor. Alternatively, a rear housing assembly station for stocking is provided. At the assembly station, the size of the compressor
By selectively assembling the rear housings 54S and 54L, two types of compressors dedicated to cooling and for both cooling and heating can be selectively obtained. Thus, according to the present embodiment, there is provided a compressor for both cooling and heating, a vehicle air-conditioning circuit using the compressor, a method of manufacturing the compressor, and a system for manufacturing the compressor, which can rationally attenuate the discharge pulsation.

Although this embodiment has been described with reference to a scroll type electric compressor, the compression mechanism is not necessarily limited to the scroll type.
Also, the drive type is not limited to the electric type by the electric motor 46.

[0024]

As described in detail above, according to the present invention,
A compressor capable of reasonably attenuating discharge pulsation, an air conditioning circuit using the compressor, and a method and system for manufacturing the compressor can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a scroll-type electric compressor used in a vehicle air-conditioning circuit that is also used for cooling and heating.

FIG. 2 is a cross-sectional view showing a scroll-type electric compressor used in a vehicle air-conditioning circuit dedicated to cooling.

FIG. 3 is a diagram showing a vehicle air conditioning circuit that is also used for cooling and heating;
(A) shows the time of heating, and (B) shows the time of cooling.

FIG. 4 is a diagram showing a vehicle air conditioning circuit dedicated to cooling.

[Explanation of symbols]

 2 Fixed scroll 4 Center housing 6 Motor housing 20 Movable scroll 21 Compression mechanism 32 Compression chamber 46 Electric motor 48 Motor chamber 50 Discharge port 51 Discharge valve 54S Small rear housing 54L Large rear housing 55S Discharge chamber 55L Discharge chamber

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F04C 29/06 F04C 29/06 D F25B 1/04 F25B 1/04 Y (72) Inventor Ken Mizuto Aichi 2-1-1 Toyota-cho, Kariya-shi, Japan Inside Toyota Industries Corporation (72) Inventor Kazuya Kimura 2-1-1 Toyota-machi, Kariya-shi, Aichi Prefecture Toyota Industries Corporation (72) Inventor Yasushi Watanabe Aichi 2-1, 1-1, Toyotamachi, Kariya, Japan Inside Toyota Industries Corporation (72) Inventor Masahiro Kawaguchi 2-1-1, Toyotamachi, Kariya, Aichi Prefecture F-term in Toyota Industries Corporation (reference) 3H003 AA05 AB05 AC03 CD01 CE02 3H029 AA02 AA16 AB03 BB22 BB31 BB32 CC09 CC25 CC26 CC28 3H039 AA04 AA12 BB02 BB07 BB08 CC29 CC33 CC34

Claims (4)

[Claims] 1. A compressor for use in a vehicle air-conditioning circuit that can switch between a cooling operation and a heating operation and that also serves as a cooling and heating system, comprising a discharge chamber for discharging a compressed and high-pressure refrigerant, the discharge chamber being provided. The compressor is characterized in that the volume of the compressor is larger than the volume of a discharge chamber of a compressor used in a vehicle air conditioning circuit dedicated to cooling. 2. A vehicle air-conditioning circuit capable of switching between a cooling operation and a heating operation, wherein the vehicle air-conditioning circuit includes a compressor as a drive source, and the compressor is compressed by the compressor. A discharge chamber for discharging the pressurized and pressurized refrigerant, the discharge chamber having a capacity larger than a discharge chamber of a compressor used in a vehicle air conditioning circuit dedicated to cooling. Vehicle air conditioning circuit. 3. A method for manufacturing a compressor used in a vehicle air conditioning circuit, comprising: a first housing forming a discharge chamber having a predetermined volume into which a compressed and high-pressure refrigerant is discharged; Providing a second housing forming a discharge chamber having a larger volume than the volume of the discharge chamber formed by the housing, and selecting the first housing or the second housing for a body of a compressor. Manufacturing the compressor, characterized by selectively obtaining a compressor used in a vehicle air conditioning circuit dedicated to cooling and a compressor used in a vehicle air conditioning circuit dedicated to cooling and heating. Method. 4. A system for manufacturing a compressor used in a vehicle air-conditioning circuit, comprising: a first housing forming a predetermined volume discharge chamber for discharging a compressed and high-pressure refrigerant at an assembly station. And a second chamber forming a discharge chamber having a larger volume than the volume of the discharge chamber formed by the first housing.
And a housing used for a vehicle air conditioning circuit exclusively used for cooling and a compressor used for a vehicle air conditioning circuit used for cooling and heating. A compressor manufacturing system.