WO2006106753A1

WO2006106753A1 - Scroll fluid machine

Info

Publication number: WO2006106753A1
Application number: PCT/JP2006/306507
Authority: WO
Inventors: Yoshitaka Koitabashi; Kou Tsukamoto; Tomokazu Naruta; Shigeyuki Koyama
Original assignee: Sanden Corporation
Priority date: 2005-04-01
Filing date: 2006-03-29
Publication date: 2006-10-12
Also published as: US20090148314A1; EP1865201B1; JP2006283694A; CN101151465A; EP1865201A1; DE602006018117D1; EP1865201A4

Abstract

An electric scroll compressor as a fluid machine, comprising a housing (10) storing both a scroll unit (20) and an armature (38) driving the scroll unit (20) and a refrigerant flow passage disposed in the housing (10) and leading a refrigerant to the scroll unit (20). The refrigerant flow passage partly comprises a spiral groove (64), and the spiral groove (64) is formed in the outer peripheral surface of a rotor (54) of the armature (38) and comprises both ends opened to both end faces of the rotor (54).

Description

Specification

Scroll type fluid machinery

Technical field

The present invention relates to a scroll type fluid machine, and more particularly to a scroll type fluid machine suitable as a scroll compressor used for refrigerant compression in a refrigeration circuit of a vehicle air conditioning system.

Background art

This type of scroll compressor is driven by a vehicle engine or an electric motor. Compared to an engine driven compressor, the electric compressor can easily adjust the refrigerant discharge amount regardless of the engine load, and can control the vehicle's indoor temperature. Preferred.

[0003] Further, since this type of scroll compressor is mounted on a vehicle, a compressor as compact as possible is required. Therefore, the electric scroll compressor disclosed in Japanese Patent Laid-Open No. 2003-129983 includes one housing common to both the scroll unit and the electric motor, and the scroll unit and the electric motor are included in the common housing. Each armature is contained!

[0004] When the electric motor is rotated, the armature generates heat. If the temperature of the armature rises excessively, the motor performance will deteriorate. Therefore, the compressor of the above publication includes a cooling path for the armature. This cooling path guides the returned refrigerant to the player in the process of returning the refrigerant toward the scroll unit. Since the temperature of the return refrigerant is sufficiently lower than the ambient temperature, the return refrigerant can cool the armature effectively.

[0005] Specifically, the cooling path includes an air gap between the rotor of the armature and the stator, a gap between the stator and the inner peripheral wall of the common housing, and a gap of the stator coil. However, since both of these gaps are narrow, the cooling path becomes a great resistance to the flow of the refrigerant toward the scroll unit and increases the pressure loss of the refrigerant. For this reason, the scroll unit cannot suck the return refrigerant efficiently, and the suction efficiency of the scroll unit is lowered. [0006] In order to solve the above-mentioned problems, a motor matrix disclosed in Japanese Patent Application Laid-Open No. 2002-165406 includes an axial passage that penetrates the rotor and fans attached to both end faces of the rotor. . When these fans are rotated, the refrigerant forcibly flows in one direction in the axial passage and cools the armature.

[0007] However, when the armature of the above publication is applied to the scroll compressor while the force is applied, the armature becomes larger because the rotor has an axial passage, so that the outer diameter of the common housing of the scroll compressor is reduced. And weight also increases. Furthermore, the fan increases the number of parts of the armature and increases the cost of the scroll compressor.

Disclosure of the invention

An object of the present invention is to provide a scroll type fluid machine that can increase the suction efficiency of a scroll unit without causing an increase in size and an increase in the number of parts.

In order to achieve the above object, a scroll type fluid machine according to the present invention includes a housing and a scroll unit accommodated in the housing, and the scroll unit cooperates with each other to provide a working fluid. A scroll unit having a fixed scroll and a movable scroll for compressing the compressor, and a housing accommodated in the housing adjacent to the scroll unit, the rotor including a rotor for rotating the movable scroll, and The rotor has a peripheral surface and both end surfaces, a armature, a fluid flow path that is disposed in the housing and guides the working fluid through the armature toward the scroll unit, and is a spiral formed on the peripheral surface of the rotor. A fluid channel including a groove, the spiral groove having both ends opened at both end faces of the rotor.

According to the scroll type fluid machine described above, when the scroll unit is driven by the armature, the scroll unit sucks the working fluid guided through the fluid flow path. The pressure of the drawn working fluid is changed as the working fluid passes through the scroll unit, and then the working fluid is discharged from the scroll unit.

[0011] Since the fluid flow path includes a spiral groove formed in the rotor, the working fluid guided to the scroll unit mainly flows through the spiral groove. The spiral groove increases the cross-sectional area of the fluid flow path, and does not become a great resistance to the flow of working fluid that the fluid flow path faces the scroll unit. As a result, the pressure loss of the working fluid is reduced and the scroll unit is The working fluid suction efficiency is improved.

[0012] Preferably, the spiral groove has a spiral direction that pushes the working fluid in the spiral groove toward the scroll unit when the rotor is rotated. In this case, during the rotation of the rotor, the working fluid in the spiral groove is pushed toward the scroll unit, so that the working fluid is forced to flow toward the scroll unit through the spiral groove, and the pressure loss of the working fluid is further reduced. If it is reduced, the suction efficiency of the scroll unit can be further improved.

Specifically, the scroll unit is a compression unit for the refrigeration circuit, and the fluid flow path guides the refrigerant returned toward the compression unit. In this case, the peripheral surface of the rotor having the spiral groove is preferably the outer peripheral surface of the rotor.

[0014] Since the temperature of the refrigerant returned to the compression unit is sufficiently lower than the ambient temperature, the refrigerant effectively cools the armature when the refrigerant flows in the spiral groove of the rotor. Therefore, overheating of the armature is prevented and the performance of the armature is maintained.

[0015] When the rotor has a laminated structure in which ring-shaped electromagnetic steel plates are laminated in the axial direction of the rotor, each electromagnetic steel plate can have a notch for forming a spiral groove on the peripheral edge forming the peripheral surface of the rotor. . In this case, the spiral groove can be easily formed on the peripheral surface of the rotor.

Brief Description of Drawings

FIG. 1 is a cross-sectional view showing a scroll compressor as a fluid machine.

FIG. 2 is a perspective view showing the rotor of FIG.

3 is a front view showing an electrical steel sheet that constitutes the rotor of FIG. 2. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

The scroll compressor of FIG. 1 is used as a compressor for a vehicle air conditioning system, that is, a refrigeration circuit. The compressor includes a cylindrical housing 10. The housing 10 includes a unit casing 12, a motor casing 14, and a circuit casing 16 in order from the left as viewed in FIG. The unit casing 12 and the motor casing 14 are connected to each other by a plurality of connecting bolts 18, and the motor casing 14 and the circuit casing 16 are connected to each other by a plurality of connecting bolts 19.

[0018] The unit casing 12 accommodates the scroll unit 20, and this scroll tube is used. G 20 has a fixed scroll 22 and a movable scroll 24. The fixed scroll 22 is fixed to the end wall 12a via a plurality of fixing bolts 26 in contact with the end wall 12a of the boot casing 12. On the other hand, the movable scroll 24 is positioned on the motor casing 14 side.

[0019] The fixed and movable scrolls 22 and 24 have spiral walls 22f and 24m, and the spiral walls 22f and 24m are assembled so as to be held together. The swirl of the spiral walls 22f, 24m forms a plurality of compression chambers 28. When the movable scroll 24 turns with respect to the fixed scroll 22, the compression chamber 28 moves spirally along the circumferential direction of the fixed scroll 22, and is directed toward the center of the fixed scroll 22. The volume of chamber 28 is reduced.

The unit casing 12 defines a discharge chamber 30 therein, and the inner end wall of the discharge chamber 30 is formed by an end wall 12a of the unit case 12 and an end plate 22a of the fixed scroll 22, respectively. The end wall 22a has a discharge hole 32 in the center thereof, and the discharge hole 32 passes through the end wall 22a. The discharge hole 32 is opened and closed by a discharge valve (not shown). The discharge valve is disposed in the discharge chamber 30 and is fixed to the end wall 22 a of the fixed scroll 22.

Furthermore, the end wall 12 a of the unit casing 12 has a discharge port 34. The inner end of the discharge port 34 communicates with the discharge chamber 30, and the outer end of the discharge port 34 is the refrigerant circulation path (not shown) of the refrigeration circuit described above, more specifically, the condensation of the refrigeration circuit via the refrigerant circulation path. Connected to a device (not shown).

[0022] When the movable scroll 24 performs a turning motion, the rotation of the movable scroll 24 is prevented! More specifically, a ball coupling 36 is sandwiched between the end plate 24 a of the movable scroll 24 and one end of the motor casing 14. The ball coupling 36 prevents the movable scroll 24 from rotating, and transmits the thrust load from the movable scroll 24 to the motor casing 14.

On the other hand, the motor casing 14 accommodates an armature 38 therein, and the end casing 48 has a motor casing 14 in the unit casing 12 side chamber 13 and the circuit casing 16 side chamber 15. Partition. The armature 38 has a rotating shaft 40, which is positioned in the center of the motor casing 14 and extends from one end of the motor casing 14 toward the circuit casing 16. Both ends of the rotating shaft 40 are connected to one end of the motor casing 14 and It is supported by the partition wall 16a in the circuit casing 16 via a ball bearing 42 and a roller bearing 44 so as to rotate. The partition wall 16 a divides the circuit casing 16 into a chamber 17 connected to the motor casing 14 and a circuit chamber 19 separated from the chamber 17.

Further, as is apparent from FIG. 1, one end of the rotating shaft 40 is formed as a large diameter end portion 46, and the large diameter end portion 46 has an end face facing the end plate of the movable scroll 24. A crankpin 48 protrudes from the end face of the large-diameter end 46 toward the movable scroll 24, and an eccentric bush 50 is attached to the crankpin 48! /. The eccentric bush 50 is rotatably supported on the movable scroll 24 by means of the bush 24a through the one-dollar bearing 52! RU

When the rotary shaft 40 is rotated, the rotational force of the rotary shaft 40 is transmitted to the movable scroll 24 via the crank pin 48, the eccentric bush 50, and the needle bearing 52. Therefore, the movable scroll 24 orbits with respect to the fixed scroll 22 with its rotation blocked by the ball coupling 36. The turning radius of the movable scroll 24 is determined by the distance between the axis of the rotary shaft 40 and the axis of the crank pin 48.

The armature 38 described above has a rotor 54, and the rotor 54 is attached to the rotating shaft 40. The rotor 54 is surrounded by a stator 56, and the stator 56 is fixed to the inner peripheral wall of the motor casing 14.

On the other hand, the circuit casing 16 has a return port 58 on its outer peripheral wall, and the inner end of the return port 58 is located inside the motor casing 14 via the chamber 17 of the circuit casing 16, that is, the chamber described above. Communicate with 15 The other end of the return port 58 is connected to the refrigerant circulation path of the refrigeration circuit, specifically, the evaporator of the refrigeration circuit via the refrigerant circulation path. Therefore, the return refrigerant having also sent the evaporator force flows into the chamber 17 of the circuit casing 16 through the return port 58 and is supplied from this chamber 17 into the motor casing 16.

[0028] A drive circuit 59 for the armature 38 is disposed in the circuit chamber 19 of the circuit casing 16, and the drive circuit 59 controls the supply of power to the armature 38 and the rotation of the armature 38, respectively.

A cooling path is secured in the motor casing 14, and the cooling path guides the return refrigerant supplied in the motor casing 14 into the armature 38. Specifically, as described above, the cooling path includes the air gap Ga between the rotor 54 and the stator 56 and the motor casing 14. In addition to the gap Gb between the inner peripheral wall and the outer peripheral wall of the stator 56 and the gap between the stator coils (not shown), a spiral groove that forms the main part of the cooling path is included. Connect chambers 13 and 15 located on both sides of armature 38.

Referring to FIG. 1 in detail, the rotor 54 has a laminated structure in which a large number of ring-shaped electromagnetic steel plates 62 are superposed in the axial direction of the rotary shaft 40 as will be apparent from FIG. As shown in FIG. 2, the spiral groove 64 is formed on the outer peripheral surface of the rotor 54, and both ends of the spiral groove 64 are opened at both end surfaces of the rotor 54. More specifically, when the rotor 54 is rotated, the spiral groove 64 has a spiral direction that moves toward the unit casing 12 side, like a right-hand thread.

[0031] In the case of the rotor 54 of one embodiment, each electromagnetic steel sheet 62 has a U-shaped notch 66 on its outer peripheral surface. When the rotor 54 is formed by laminating a large number of electrical steel sheets 62, the notches 66 of the adjacent electrical steel sheets 62 overlap each other while being slightly displaced in the circumferential direction of the rotor 54. The notches 66 arranged in the axial direction form the spiral groove 64 described above.

[0032] It should be noted that the spiral groove 64 can also be formed on the outer peripheral surface of the rotor 54 by machining after the rotor 54 is formed of a large number of electromagnetic steel plates 62.

On the other hand, a suction chamber 60 for the scroll unit 20 is defined in the unit casing 12, and the suction chamber 60 surrounds the movable scroll 24 of the scroll unit 20, and is fixed from the discharge chamber 30 to the fixed scroll 22. Separated by! The suction chamber 60 is connected to the chamber 13 in the motor casing 14 through the internal space of the ball coupling 36, the space between the movable scroll 24 and the ball bearing 42, and the internal space of the ball bearing 42. Has been. Therefore, the suction chamber 60 is connected to the return port 58 of the circuit casing 16 through the refrigerant flow path including the cooling path described above. As a result, the return refrigerant flowing into the return port 58 passes through the refrigerant flow path. Supplied to suction chamber 60.

When the rotary shaft 40 of the armature 38 described above is rotated, the rotation of the rotary shaft 40 is transmitted to the movable scroll 24 via the clamp pin 48 and the eccentric bush 50. Therefore, the movable scroll 24 turns with respect to the fixed scroll 22 in a state where its rotation is prevented. During the orbiting movement of the movable scroll 24, one compression chamber 28 opens to the suction chamber 60. Then, the refrigerant is sucked into the compression chamber 28 from the suction chamber 60, and the compression chamber 28 is separated from the suction chamber 60.

[0035] Thereafter, the compression chamber 28 moves toward the discharge hole 32 of the fixed scroll 22 by the orbiting motion of the movable scroll 24, and in this process, the volume in the compression chamber 28 is reduced, resulting in the pressure being reduced. The refrigerant sucked into the compression chamber 28 is compressed. When the compression chamber 28 reaches the discharge hole 32 and the pressure of the refrigerant in the compression chamber 28 overcomes the cutoff pressure of the discharge valve, the discharge valve is opened, and the compressed refrigerant in the compression chamber 28 passes through the discharge hole 32. Discharged into the discharge chamber 30.

[0036] The compressed refrigerant in the discharge chamber 30 is sent to the refrigerant circulation path through the discharge port 34, and is supplied toward the condenser of the refrigeration circuit. Thereafter, the compressed refrigerant is supplied to the evaporator through a receiver and an expansion valve in the refrigerant circulation path, and then returns from the evaporator to return to the return port 58. Then, the return port 58 Into the chamber 17 in the circuit casing 16. Further, the return refrigerant is supplied from the chamber 17 to the suction chamber 60 through the above-described refrigerant flow path, that is, the cooling flow path.

[0037] As described above, the temperature of the return refrigerant is sufficiently lower than the ambient temperature! Therefore, the return refrigerant flowing through the cooling path effectively cools the armature 38 and prevents the armature 38 from overheating. . The cooling path includes a spiral groove 64 as its main part, and this spiral groove 64 increases the effective channel cross-sectional area of the entire cooling path. Therefore, the cooling path does not become a great resistance to the flow of the return refrigerant directed to the suction chamber 60, and the pressure loss of the return refrigerant is small.

[0038] Further, since the spiral groove 64 rotates together with the rotor 54, the return refrigerant in the spiral groove 64 is forcibly pushed toward the boot casing 12, and thus, the motor housing 14 is inserted into the spiral groove 64. A return refrigerant flow from chamber 15 to chamber 13 occurs.

As a result, when the armature 38 is effectively cooled by the forced flow of the return refrigerant, supercharging of the return refrigerant to the suction chamber 60, which is not a force, is achieved. Efficiency is increased and the performance of the scroll compressor can be improved.

[0040] The above-described spiral groove 64 prevents the large size of the scroll compressor without increasing the number of parts for the rotor 54 and the number of parts for the armature 38, and further prevents the large size of the scroll compressor. Greatly contributes to weight reduction.

[0041] The present invention can be variously modified without being limited to the above-described embodiment. For example, as shown by a two-dot chain line in FIG. 3, the rotor 54 may have a plurality of spiral grooves 64 on its outer peripheral surface. The above spiral groove 64 can be provided.

Furthermore, the present invention is equally applicable to a scroll expander instead of a compressor.

Claims

The scope of the claims

[1] a housing;

A scroll unit housed in the housing, the scroll unit having a fixed scroll and a movable scroll for compressing the working fluid in cooperation with each other;

An armature housed in the housing adjacent to the scroll unit, the rotor including a rotor for rotating the movable scroll, the rotor having a peripheral surface and both end surfaces;

A fluid passage that is disposed in the housing and guides a working fluid through the armature toward the scroll unit, and includes a screw formed on the peripheral surface of the rotor. A fluid passage having both ends opened at the both end faces;

A scroll type fluid machine comprising:

2. The scroll fluid machine according to claim 1, wherein the spiral groove has a spiral direction that pushes the working fluid in the spiral groove toward the scroll unit when the rotor is rotated.

3. The scroll type fluid machine according to claim 2, wherein the scroll unit is a compression unit for a refrigeration circuit, and the fluid flow path guides a refrigerant returned toward the compression unit.

4. The scroll type fluid machine according to claim 2, wherein the peripheral surface of the rotor is an outer peripheral surface of the rotor.

5. The scroll type fluid machine according to claim 4, wherein the scroll unit is a compression unit for a refrigeration circuit, and the fluid flow path guides a refrigerant returned toward the compression unit.

[6] The rotor has a laminated structure in which ring-shaped electromagnetic steel plates are laminated in the axial direction of the rotor, and each electromagnetic steel plate forms the spiral groove on a peripheral edge forming the peripheral surface of the rotor. The scroll type fluid machine according to claim 2, further comprising a notch.