JP5758221B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor having a cooling fluid circuit that cools a fixed scroll with a cooling fluid.

  One type of compressor in a refrigerating apparatus such as an air conditioner is a scroll compressor. The scroll compressor normally includes a fixed scroll and a turning scroll, and sucks and compresses gas into a compression chamber formed between the fixed scroll and the turning scroll. In the scroll compressor, gas refrigerant is sucked from the suction port of the fixed scroll. The volume of the crescent-shaped compression chamber formed between the spiral wraps of both scroll members is reduced by the orbiting scroll that revolves without rotating its axis with respect to the fixed scroll member. The gas refrigerant confined in the compression space is compressed toward the center of the vortex due to the reduction of the compression chamber accompanying the turning motion. The compression space is minimized at the center, the pressure of the gas refrigerant is increased, and the pressure space is pushed out from the discharge port at the center.

  Such scroll compressors are widely used in refrigeration systems and air conditioning systems because of their high efficiency, small volume, low vibration, and low noise.

  On the other hand, since the energy consumption of the compressor accounts for the majority of the energy consumption of the entire system in the refrigeration system and the air conditioning system, increasing the efficiency of the scroll compressor is important for energy saving and efficiency improvement of the entire system. ing.

  In the various compression strokes, the isothermal compression stroke is the most efficient compression cycle. In order to achieve the isothermal compression, cooling is performed in the compression stroke, and the amount of heat generated by the work in the compression stroke is used as a gas refrigerant. Need to be removed from. There is an external cooling method as a cooling method of the scroll compressor. As an external cooling structure currently used, a structure in which cooling fins are installed outside the head of the compressor, or a structure in which a water cooling jacket is provided in the head portion to perform water cooling or oil cooling has been proposed.

However, in these scroll compressor cooling structures currently in use, the cooling area between the cooling fluid and the gas refrigerant is small, so the energy saving effect of the scroll compressor is not significant.
In addition, the scroll portion of the scroll compressor includes a flat portion and a wrap, and when the cooling head or the cooling jacket is provided on the compressor head as in the current state for cooling, the flat portion can be cooled. There is a problem that it is difficult to cool the lap portion.

  An object of the present invention is to solve the problem that the cooling effect is insufficient because the cooling area is small, and to provide a scroll compressor having a high cooling effect.

  The scroll compressor according to the present invention is a scroll compressor including a fixed scroll and a turning scroll, and the fixed scroll includes a bottom plate portion and a spiral wrap. Here, the fixed scroll has a first cooling part for cooling the bottom plate part, a second cooling part for cooling the spiral wrap, and an intermediate communication part for communicating the first cooling part and the second cooling part. And a cooling fluid introduction part and a cooling fluid discharge part. In addition, a cooling fluid circuit in which the cooling fluid flows is formed in the order of the introduction unit, the second cooling unit, the intermediate communication unit, the first cooling unit, and the discharge unit or in the opposite order.

  As an example, the bottom plate portion includes a fixed seat integrally formed with the spiral wrap, and a fixed lid connected to the fixed seat from the opposite side of the spiral wrap. It is formed in either one of the inside of the fixed seat.

  As an example, the first cooling part is configured by a first groove formed in the fixed lid, and the first groove has a groove shape corresponding to the shape of the bottom surface formed between the spiral wraps of the fixed scroll. And extends toward the center of the fixed lid.

  As another example, the 1st cooling part is comprised by the 2nd groove | channel formed in the inside of a fixed seat, and a 2nd groove | channel respond | corresponds to the shape of the bottom face formed between the spiral wraps of a fixed scroll. It has a groove shape.

As an example, the second cooling unit is configured by a third groove formed inside the spiral wrap, and the third groove extends toward the center of the spiral along the spiral shape of the spiral wrap.
As an example, a central discharge port is formed in the center portion of the bottom plate portion, the introduction portion and the discharge portion are formed on the outer edge portions of the bottom plate portion, respectively, and the intermediate communication portion is close to the central discharge port of the bottom plate portion. Is formed.

  As an example, the intermediate communication portion is formed inside the fixed lid and in the vicinity of the central discharge port, and the introduction portion and the discharge portion are respectively formed on the outer edge portions of the fixed lid.

  As another example, the intermediate communication part is formed inside the fixed seat and close to the central discharge port, and the introduction part and the discharge part are respectively formed on the outer edge part of the fixed lid.

  As an example, the intermediate communication portion is formed at the connection portion between the fixed lid and the fixed seat and is formed in the vicinity of the central discharge port, and the introduction portion and the discharge portion are respectively formed at the outer edge portions of the fixed lid. ing.

  As an example, a first sealing mechanism is provided on each of the outermost and innermost sides of the cooling fluid circuit.

  As an example, the introduction part and the discharge part are each provided with a second sealing mechanism.

  In the scroll compressor according to the present invention, the first cooling unit and the second cooling unit are respectively provided on the bottom plate portion and the spiral wrap of the fixed scroll, and each of the bottom plate portion and the spiral wrap of the fixed scroll is cooled. be able to. As a result, the cooling area increases, the efficiency of the scroll compressor itself increases, and a remarkable energy saving effect can be obtained as the entire refrigeration system.

  In addition, an intermediate communication part is provided for communicating the first cooling part and the second cooling part, and the cooling fluid is in the DC format in the order of the second cooling part → the intermediate communication part → the first cooling part or vice versa. It has a structure that flows through. Normally, the cross-sectional area of the first cooling part formed on the bottom plate is larger than the cross-sectional area of the second cooling part formed on the spiral wrap, so that the cooling fluid flows in parallel between the bottom plate and the spiral. As a result, a deviation of the cooling fluid occurs in the first cooling unit and the second cooling unit, and the cooling effect of the spiral wrap decreases. However, in the present invention, the cooling fluid flows in the direct current format in the order of the second cooling part → the intermediate communication part → the first cooling part or vice versa, so the first cooling part and the second cooling part There is no deviation of the cooling fluid from the cooling section, and the cooling effect of the spiral wrap is improved.

The longitudinal cross-sectional view of the compressor which concerns on one Embodiment of this invention Perspective view of fixed scroll Cross section of fixed scroll cooling structure Partial sectional view of fixed scroll cooling structure Top view of fixed seat Bottom view of fixed lid BB sectional view of FIG. Sectional drawing of cooling structure modification 1 of fixed scroll Sectional drawing of cooling structure modification 2 of fixed scroll Sectional drawing of cooling structure modification 3 of a fixed scroll

<Overall configuration of compressor>
The compressor 100 provided with the fixed scroll 40 and the turning scroll 50 which are scroll members which concern on one Embodiment of this invention is shown in FIG. The compressor 100 constitutes a refrigerant circuit together with an evaporator, a condenser, an expansion valve, and the like, and plays a role of compressing a gas refrigerant in the refrigerant circuit. The compressor 100 mainly has a cylindrical sealed dome shape. The casing 300 includes a scroll compression mechanism 150, an Oldham ring 390, a drive motor 160, a lower main bearing 600, a suction pipe 190, and a discharge pipe 200. The scroll compression mechanism 150 includes a fixed scroll 40 and a turning scroll 50. Hereinafter, the components of the compressor 100 will be described in detail.

(1) Casing The casing 300 includes a substantially cylindrical trunk casing portion 310, a bowl-shaped upper wall portion 330 that is airtightly welded to the upper end portion of the trunk casing portion 310, and a lower end of the trunk casing portion 310. And a bowl-shaped bottom wall portion 320 that is welded to the portion in an airtight manner. The casing 300 mainly accommodates a scroll compression mechanism 150 that compresses the gas refrigerant and a drive motor 160 disposed below the scroll compression mechanism 150. The orbiting scroll 50 of the scroll compression mechanism 150 and the drive motor 160 are connected by a drive shaft 170 arranged to extend in the casing 300 in the vertical direction.

(2) Scroll Compression Mechanism As shown in FIG. 1, the scroll compression mechanism 150 mainly meshes with the support base 230, the fixed scroll 40 arranged in close contact with the support base 230, and the fixed scroll 40. The orbiting scroll 50 is configured.

(2-1) Fixed Scroll As shown in FIGS. 2 to 6, the fixed scroll 40 mainly includes a bottom plate portion 1 and an involute spiral wrap 2 that extends vertically downward from the bottom plate portion 1. The

  The bottom plate portion 1 includes a fixed seat 11 formed integrally with the spiral wrap 2 and a fixed lid 12 connected to the fixed seat 11 from the side opposite to the spiral wrap 2. Are connected by a connecting bolt (not shown).

  The fixed lid 12 is formed with a discharge hole 60 communicating with a compression chamber 400 described later, and the discharge hole 60 is formed so as to penetrate in the vertical direction in the central portion of the fixed seat 11 and the fixed lid 12. . The fixed lid 12 is formed with a cooling fluid introduction part 4 and a cooling fluid discharge part 5. The cooling fluid is introduced into the cooling fluid circuit formed in the fixed scroll 40 via the introduction pipe 4 ′ connected to the introduction unit 4, and the cooling fluid discharged from the cooling fluid circuit is connected to the discharge unit 5. It is discharged outside through 5 '.

(2-2) Orbiting Scroll As shown in FIG. 1, the orbiting scroll 50 mainly includes an end plate 510, an involute wrap 520 that extends upward from the mirror surface of the end plate 510, and a bearing that extends downward from the lower surface of the end plate 510. It is comprised from the part 530 and the groove part 540 formed in the both ends of the end plate 510. FIG. The orbiting scroll 50 has a bearing portion 530 that fits into the outer peripheral groove of the drive shaft 170.

  The orbiting scroll 50 is supported by the support base 230 by fitting an Oldham ring 390 (see FIG. 1) into the groove portion 540. Further, the upper end of the drive shaft 170 is fitted into the bearing portion 530. By incorporating the orbiting scroll 50 into the scroll compression mechanism 150 in this way, the orbiting scroll 50 revolves within the support base 230 without rotating due to the rotation of the drive shaft 170. The wrap 520 of the orbiting scroll 50 meshes with the spiral wrap 2 of the fixed scroll 40, and a compression chamber 400 is formed between the contact portions of the spiral wrap 2 of the fixed scroll and the spiral wrap 520 of the orbiting scroll (see FIG. 1). ). The compression chamber 400 is displaced toward the center with the revolution of the orbiting scroll 50, and the volume of the compression chamber 400 contracts.

  Thereby, in the compressor 100, the gas refrigerant which entered the compression chamber 400 is compressed.

(2-3) Support stand The support stand 230 is press-fitted and fixed to the body casing portion 310 over the entire circumferential direction on the outer peripheral surface thereof. A set of fan-shaped passages is formed on the outer peripheral surface of the support base 230, and the high-pressure gas discharged from the central discharge port 60 is sent from the upper space 290 to the lower space 280 and then discharged from the discharge pipe 200. Further, the support base 230 is fastened and fixed to the fixed scroll 40 by a plurality of bolts 380 so that the upper end surface thereof is in close contact with the lower end surface of the fixed scroll 40.

(3) Oldham ring The Oldham ring 390 is a member for preventing the rotation of the orbiting scroll 50 as described above, and is fitted into an Oldham groove (not shown) formed in the support base 230. . The Oldham groove is an oval groove and is disposed at a position facing each other on the support base 230.

(4) Lower Main Bearing The lower main bearing 600 is disposed in the lower space below the drive motor 160. The lower main bearing 600 is fixed to the trunk casing 310 and constitutes a lower end bearing of the drive shaft 170 to support the drive shaft 170.

(6) Suction Pipe The suction pipe 190 is for guiding the refrigerant in the refrigerant circuit to the scroll compression mechanism 150 and is fitted into the upper wall 330 of the casing 300 in an airtight manner. The suction pipe 190 passes through the upper high-pressure space 290 in the vertical direction, and the inner end portion is fitted into the fixed scroll 40.

(7) Discharge pipe The discharge pipe 200 is for discharging the refrigerant in the casing 300 to the outside of the casing 300, and is fitted into the body casing portion 310 of the casing 300 in an airtight manner.

<Cooling structure of fixed scroll>
The cooling structure of the fixed scroll 40 is shown in FIGS. The first cooling part 10 for cooling the bottom plate part is constituted by a first groove 9 formed in the fixed lid 12. The first groove 9 has a groove shape corresponding to the shape of the bottom surface 24 formed between the spiral wraps 2 of the fixed scroll 40, and extends toward the center of the fixed lid 12. The introduction portion 4 and the discharge portion 5 are formed at the outer edge portion of the fixed lid 12, and the central discharge port 60 is formed at the central portion of the fixed lid 12.

  On the other hand, a second cooling part 21 is formed in the spiral wrap 2 formed integrally with the fixed seat 11. The second cooling unit 21 is configured by a third groove 22 formed in the spiral wrap 2, and the third groove 22 extends along the spiral shape of the spiral wrap 2 toward the center of the spiral.

  Moreover, the intermediate | middle communication part 3 which connects the 1st cooling part 10 and the 2nd cooling part 21 was formed in the 2nd cooling part 21 and the fixed lid 12 which were formed in the fixed seat 11, as shown in FIG. It is formed on the contact surface with the first cooling unit 10 and is formed close to the central discharge port 60.

<Cooling circuit and features of fixed scroll>
The cooling fluid introduced from the introduction portion 4 formed at the outer edge portion of the fixed lid 12 is introduced into the outer end 23 of the third groove 22 formed inside the spiral wrap 2 of the fixed seat 11 shown in FIG. . Since the third groove 22 extends toward the center of the spiral along the spiral shape of the spiral wrap 2, the shape of the second cooling part 21 also has a shape along the spiral shape of the spiral wrap 2, and the cooling fluid Flows from the outer end 23 of the spiral to the center end 25 and can cool the interior of the spiral wrap 2 of the fixed seat 11 without any problem.

  The cooling fluid flowing out from the center end 25 of the second cooling unit 21 flows into the center end 91 of the first groove 9 constituting the first cooling unit 10 via the intermediate communication unit 3. Since the first groove 9 has a groove shape corresponding to the shape of the bottom surface 24 formed between the spiral wraps 2 of the fixed scroll 40, the cooling fluid flowing from the center end 91 of the first groove 9 It flows to the outer end 92 of the first groove 9 along the shape of the first groove 9 and is discharged from the discharge portion 5. As a result, the cooling fluid can cool the fixed lid 12.

  The fixed scroll 40 of the scroll compressor is provided with a first cooling part 10 and a second cooling part 21 on the bottom plate part 1 and the spiral wrap 2, respectively. Each can be cooled. As a result, the cooling area increases, the efficiency of the scroll compressor itself increases, and a remarkable energy saving effect can be obtained as the entire refrigeration system.

  Further, an intermediate communication part 3 for communicating the first cooling part 10 and the second cooling part 21 is provided, and the cooling fluid flows from the introduction part 4 to the outer end 23 of the third groove 22 of the second cooling part 21 to the second. The center end 25 of the third groove 22 of the cooling part 21 → the intermediate communication part 3 → the center end 91 of the first groove 9 of the first cooling part 10 → the outer end 92 of the first groove 9 of the first cooling part 10 → the discharge part 5 and flows in the DC fluid cooling fluid circuit in the order of 5. Normally, when the cooling fluid is allowed to flow in parallel between the bottom plate portion and the spiral portion, the sectional area of the bottom plate cooling portion formed in the bottom plate portion is larger than the sectional area of the spiral wrap cooling portion formed in the spiral wrap. This causes a problem that the cooling fluid shifts in the vortex wrap cooling section and the cooling effect of the vortex wrap is reduced. However, here, since the cooling fluid flows in the DC format in the order of the second cooling unit 21 → the intermediate communication unit 3 → the first cooling unit 10, the cooling fluid flows between the first cooling unit 10 and the second cooling unit 21. The deviation of the cooling fluid does not occur, and the cooling effect of the spiral wrap 2 is improved.

  Further, since the intermediate communication portion 3 is formed close to the central discharge port 60, the cooling effect of the central discharge port 60 can be improved.

  Further, a first sealing mechanism 13 is formed on the outermost side of the cooling fluid circuit, and a second sealing mechanism 14 is formed on the innermost side of the cooling fluid circuit. These sealing mechanisms are composed of, for example, grooves formed in the fixed lid 12 along the cooling fluid circuit, and a sealing seal ring fitted in these grooves. By these sealing mechanisms, mixing of the cooling fluid and the refrigerant of the compressor can be prevented.

  Further, as shown in FIG. 6, an elliptical hole is provided in the lower portion of the introduction portion 4 provided in the fixed seat 12. Although the cooling fluid introduced from the introduction part 4 is introduced into the third groove 22 of the spiral wrap 2, the cross-sectional area of the third groove 22 is significantly smaller than the cross-sectional area of the introduction part 4. Resistance increases. Since the elliptical hole is provided between the lower part of the introduction part 4 and the third groove 22, the resistance of the fluid due to a sudden change in the cross-sectional area can be reduced.

  Further, as shown in FIG. 7, the introduction unit 4 is provided with a third sealing mechanism 41, and the discharge unit 5 is provided with a fourth sealing mechanism 51. These sealing mechanisms are composed of, for example, grooves formed in the introduction part 4 and the discharge part 5 and a sealing seal ring fitted in these grooves. By these sealing mechanisms, mixing of the cooling fluid and the refrigerant of the compressor can be prevented.

<Modification>
In the above-described embodiment, as the cooling circuit for the cooling fluid, the direct current format is adopted in the order of the second cooling unit 21 → the intermediate communication unit 3 → the first cooling unit 10. It is also possible to adopt the direct current format in the order of cooling unit 10 → intermediate communication unit 3 → second cooling unit 21.

  Moreover, in the said embodiment, although the 1st cooling part 10 gave the example comprised by the 1st groove | channel 9 formed in the fixed cover 12, the present invention is not limited to this. As shown in FIGS. 8 and 9, the same cooling effect can be obtained even in the structure in which the first cooling portion 10 ′ is configured by the second groove 9 ′ formed in the fixed seat 11.

  As shown in FIG. 8, the intermediate communication portion 3 ′ can be formed in the spiral wrap 2 as the arrangement position of the intermediate communication portion, and the first cooling portion 10 ′ and the second cooling portion 21 can communicate with each other.

  In addition, as an arrangement position of the intermediate communication portion, in FIG. 9, the intermediate communication portion 3 ″ can be formed on the fixed lid 12 so that the first cooling portion 10 ′ and the second cooling portion 21 can communicate with each other.

DESCRIPTION OF SYMBOLS 1 Bottom plate part 2 Spiral wrap 3, 3 ', 3''communication part 4 Introduction part 5 Discharge part 9 1st groove 9' 2nd groove 10, 10 'Cooling part 11 Fixed seat 12 Fixed lid 21 2nd cooling part 22 Third groove 40 Fixed scroll 50 Orbiting scroll 60 Central discharge port 13, 14 First sealing mechanism 41, 51 Second sealing mechanism

Claims (11)

A scroll compressor including a fixed scroll (40) and a turning scroll (50),
The fixed scroll has a bottom plate portion (1) and a spiral wrap (2),
For the fixed scroll,
A first cooling part (10, 10 ') for cooling the bottom plate part;
A second cooling part (21) for cooling the spiral wrap;
An intermediate communication part (3, 3 ′, 3 ″) for communicating the first cooling part and the second cooling part;
A cooling fluid inlet (4);
A cooling fluid discharge (5) is formed,
Of the introduction part (4), the second cooling part (21), the intermediate communication part (3, 3 ′, 3 ″), the first cooling part (10, 10 ′), the discharge part (5) A cooling fluid circuit is formed in which the cooling fluid flows in order or in the opposite order;
Scroll compressor. The bottom plate portion (1) includes a fixed seat (11) formed integrally with the spiral wrap, and a fixed lid (12) connected to the fixed seat from the opposite side of the spiral wrap,
The first cooling part is formed either inside the fixed lid or inside the fixed seat,
The scroll compressor according to claim 1. The first cooling part (10) is constituted by a first groove (9) formed in the fixed lid (12),
The first groove (9) has a groove shape corresponding to the shape of the bottom surface (24) formed between the spiral wraps (2) of the fixed scroll (40), toward the center of the fixed lid. Stretched,
The scroll compressor according to claim 2.
The first cooling part (10 ′) is constituted by a second groove (9 ′) formed inside the fixed seat (11),
The second groove (9 ′) has a groove shape corresponding to the shape of the bottom surface (24) formed between the spiral wraps (2) of the fixed scroll (40).
The scroll compressor according to claim 2. The second cooling part (21) is constituted by a third groove (22) formed inside the spiral wrap (2), and the third groove is a center of the spiral along the spiral shape of the spiral wrap. Stretching towards
The scroll compressor in any one of Claims 1-4. A central discharge port (60) is formed in a central portion of the bottom plate portion, and the introduction portion and the discharge portion are respectively formed on outer edge portions of the bottom plate portion,
The intermediate communication part (3, 3 ′, 3 ″) is formed in the vicinity of the central discharge port (60) of the bottom plate part,
The scroll compressor according to claim 2. The intermediate communication part (3) is formed inside the fixed lid (12) and close to the central discharge port,
The introduction part and the discharge part are each formed on an outer edge part of the fixed lid,
The scroll compressor according to claim 6.
The intermediate communication portion (3 ′) is formed inside the fixed seat (11) and close to the central discharge port,
The introduction part and the discharge part are each formed on an outer edge part of the fixed lid,
The scroll compressor according to claim 6. The intermediate communication portion (3 '') is formed at a connection portion between the fixed lid (12) and the fixed seat (11), and is formed close to the central discharge port,
The introduction part and the discharge part are each formed on an outer edge part of the fixed lid,
The scroll compressor according to claim 6.   The scroll compressor according to claim 1, wherein a first sealing mechanism (13) and a second sealing mechanism (14) are provided on the outermost side and the innermost side of the cooling fluid circuit, respectively. The introduction part (4) and the discharge part (5) are provided with a third sealing mechanism (41) and a fourth sealing mechanism (51), respectively.
The scroll compressor according to claim 1.

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