JP2019100334A - Scroll compressor - Google Patents

Abstract

To provide a scroll compressor which has an improved compression rate while preventing the same from getting complex in whole.SOLUTION: A scroll compressor comprises: a fixed scroll 21 which is fixed to a side of a compressor body; a mobile scroll 20 which is arranged so as to be rotatable with respect to the fixed scroll 21; a compression space 43 which is formed as a gap between the fixed scroll 21 and the mobile scroll 20; a shaft 18 which applies drive force to the mobile scroll 20; a fan 17 which is installed on the shaft 18; and a casing 31. In the scroll compressor, the fan 17 introduces fluid entering into the casing 31 into the compression space by being rotated together with the shaft 18.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor capable of increasing the compression rate of fluid.

  In a general scroll compressor, a fixed scroll is fixed to a scroll body, and a movable scroll is pivotably combined with the fixed scroll. When the scroll compressor is operated, the movable scroll turns with the turning center as the rotation axis, whereby the fluid introduced between the fixed scroll and the movable scroll from the periphery of the scroll compressor is compressed between the two. While moving towards the center. The fluid reaching the center is supplied out of the system in a compressed state. For example, Patent Document 1 describes a scroll compressor having such a configuration.

Patent No. 4635660 gazette

  However, in the scroll compressor having the above-described general configuration, it is not easy to obtain a high compression ratio because fluid in a less pressurized state is introduced into the space between the movable scroll and the fixed scroll. There was a problem.

  In addition, if a compressor for compressing the fluid is inserted in the front part of the scroll compressor to increase the compression rate, the fluid pressurized by the compressor can be supplied to the scroll compressor, so that a high compression rate can be obtained. It can. However, since a separate compressor is newly required, there is a problem that the entire apparatus becomes complicated and expensive.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a scroll compressor having an improved compression rate while suppressing complication of the entire apparatus.

  The scroll compressor according to the present invention is formed as a fixed scroll fixed on the compressor body side, a movable scroll rotatably disposed with respect to the fixed scroll, and a gap between the fixed scroll and the movable scroll. The apparatus includes a compression space, a shaft for providing a driving force to the movable scroll, a fan attached to the shaft, a casing, and a motor for rotating the shaft, the fan rotating with the shaft. The fluid introduced into the casing may be introduced into the compression space.

  The scroll compressor according to the present invention is formed as a fixed scroll fixed on the compressor body side, a movable scroll rotatably disposed with respect to the fixed scroll, and a gap between the fixed scroll and the movable scroll. The apparatus includes a compression space, a shaft for providing a driving force to the movable scroll, a fan attached to the shaft, a casing, and a motor for rotating the shaft, the fan rotating with the shaft. The fluid introduced into the casing may be introduced into the compression space. Therefore, when the scroll compressor is operated to compress the fluid, the refrigerant blown by the fan inside the casing is introduced into the compression space, so that the compression ratio of the fluid in the compression space can be improved. In addition, since the fan for introducing the fluid into the compression chamber is rotated by the shaft that gives the movable scroll a driving force, an increase in the number of parts due to the provision of the fan is suppressed.

It is a figure showing a scroll compressor concerning an embodiment of the present invention, (A) is a perspective view, (B) is a figure which looked at a scroll compressor from the front, (C) is C of (B). It is sectional drawing in-C line. It is an exploded perspective view showing a scroll compressor concerning an embodiment of the present invention. It is a figure showing an inner housing of a scroll compressor concerning an embodiment of the present invention. It is a figure showing a scroll compressor concerning an embodiment of the present invention, and is a sectional view showing related composition of a front casing part and a motor. It is a figure showing a scroll compressor concerning an embodiment of the present invention, (A) is a perspective view showing a front casing part and a stator, (B) is a perspective view showing a front casing part partially.

  Hereinafter, the scroll compressor 10 of the present embodiment and a method of manufacturing the same will be described with reference to the drawings. In the following description, the same parts will be denoted by the same reference numerals, and overlapping descriptions will be omitted. In the following description, the upper, lower, front, rear, left, and right directions are appropriately used, but the front indicates the upstream side of the fluid flow inside the scroll compressor 10, the rear is the opposite side of the front, and the left and right indicate scroll compression. The left and right of the machine 10 as viewed from the front are shown.

  The configuration of the scroll compressor 10 according to the present embodiment will be described with reference to FIG. 1 (A) is a perspective view showing the whole of the scroll compressor 10, FIG. 1 (B) is a side view of the scroll compressor 10 as viewed from the front, and FIG. 1 (C) is FIG. 1 (B). It is sectional drawing in the CC line of.

  Referring to FIGS. 1A and 1B, in scroll compressor 10, members functioning as scroll compressor 10 are housed inside casing 31. As shown in FIG. Further, as shown in FIG. 1C, the casing 31 includes, from the front, the front casing 12, the front casing portion 11, the rear casing portion 29, and the rear case 22, and accommodates the respective members. The front casing portion 11 and the rear casing portion 29 form a substantially cylindrical body portion. The front casing 12 closes the front opening of the front casing portion 11. The front casing 12 is fastened to the front portion of the front casing portion 11 by fastening means such as screws. In addition, the rear case 22 closes the rear opening of the rear casing portion 29. The rear case 22 is fastened to the rear portion of the rear casing portion 29 by fastening means such as screws. Each member which comprises the scroll compressor 10 is comprised from metal materials, such as stainless steel or aluminum.

  Referring to FIG. 1C, the inverter board 15, the motor 16, the internal housing 19, the fan 17, the movable scroll 20 and the fixed scroll 21 are disposed inside the casing 31 from the front side. The discharge port 24 is formed by penetrating the substantially central portion of the fixed scroll 21, and the discharge port 24 is covered with the valve body 25 from the rear. When the refrigerant is compressed between the internal housing 19 and the movable scroll 20, the valve body 25 is opened by the pressure.

  The function of the scroll compressor 10 is to rotate the movable scroll 20 by the driving force of the built-in motor 16 to compress the refrigerant (fluid) introduced from the inlet 13 and to compress the compressed refrigerant from the exhaust port 14 It is to discharge to the outside. From the intake port 13, a refrigerant which has passed through an evaporator (not shown) is introduced. The scroll compressor 10 is connected via a condenser, expansion means and an evaporator, which are not shown here, and a refrigerant pipe to constitute a vapor compression refrigeration cycle. This vapor compression refrigeration cycle is used, for example, as an air conditioner that cools or heats the interior of a vehicle.

  The configuration of the scroll compressor 10 according to the present embodiment will be described in detail with reference to FIG. In FIG. 2, each member which comprises the scroll compressor 10 is decomposed | disassembled in the front-back direction, and is shown. Further, a center line 27 of the scroll compressor 10 is indicated by an alternate long and short dash line.

  An inverter board 15 is formed in a storage space 33 formed in the front end portion of the front casing portion 11. In the inverter substrate 15, an inverter formed of a conductive path and a circuit element is incorporated on the surface of a circularly formed substrate. The inverter includes, for example, a converter circuit that converts the input commercial AC power into DC power, and an inverter circuit that converts the DC power into AC power of a predetermined frequency. The inverter board 15 supplies AC power to the motor 16 described above. Although the inverter substrate 15 generates heat during operation of the scroll compressor 10, as described later, the inverter substrate 15 is cooled by circulating a part of the refrigerant introduced into the casing 31 in the vicinity of the inverter substrate 15. doing. By doing this, overheating of the inverter substrate 15 can be suppressed, and the inverter circuit can be operated stably.

  A partition wall 32 is integrally formed on the front end side of the front casing portion 11, and the inner space of the front casing portion 11 is partitioned by the partition wall 32 on the front side and the rear side. A front side of the partition wall 32 is a storage space 33, and the above-described inverter board 15 is stored in the storage space 33.

  The intake port 13 is formed by partially opening the side portion of the front casing portion 11 and laterally projecting the opening portion in a tubular shape.

  Inside the front casing portion 11, a motor 16 having a substantially cylindrical outer shape is accommodated. As described later, a gap that allows the flow of the refrigerant is formed between the inner side surface of the front casing portion 11 and the outer side surface of the motor 16.

  The shaft 18 is a substantially cylindrical steel rod, and the front portion thereof is inserted into the motor 16. The driving force of the motor 16 rotates the shaft 18.

  The shaft 18 is inserted through the fan 17. The fan 17 rotates with the shaft 18. The fan 17 may be a centrifugal fan which blows radially outward by rotating, or may be an axial flow fan which blows rearward by rotating.

  The internal housing 19 is a wall-like member that divides the internal space of the casing 31 back and forth. The shaft 18 passes through a hole formed at the center of the inner housing 19. A pivoting mechanism 23 for pivoting the movable scroll 20 by the rotational movement of the shaft 18 is housed in a housing portion 40 in which a central portion of the inner housing 19 is projected forward in a substantially cylindrical shape. The inner housing 19 is fixed to the front end portion of the rear casing portion 26. Further, the internal housing 19 is partially opened to communicate the front space and the rear space of the internal housing 19 with each other, thereby forming a communication port 28 through which the refrigerant flows. The specific shape of the communication port 28 will be described later.

  The movable scroll 20 is a scroll disposed on the rear side of the inner housing 19 and pivoted by the pivoting mechanism 23 described above.

  The fixed scroll 21 is fastened to the rear casing portion 29 via fastening means such as screws. When the movable scroll 20 turns relative to the fixed scroll 21, the refrigerant is compressed in a compression space 43 (FIG. 1C) formed between the movable scroll 20 and the fixed scroll 21. The compressed refrigerant is discharged rearward from a hole (not shown) formed at the center of the fixed scroll 21.

  The rear case 22 covers the fixed scroll 21 from the rear. The rear case 22 is fastened to the rear casing portion 29 together with the fixed scroll 21 to be inserted through fastening means such as bolts. An exhaust port 14 communicating the internal space of the casing 31 with the outside is formed on the side of the rear case 22. The exhaust port 14 protrudes laterally in a substantially cylindrical shape. The compressed refrigerant compressed by the orbiting of the movable scroll 20 with respect to the fixed scroll 21 is discharged to the outside through the exhaust port 14. The refrigerant discharged from the exhaust port 14 is sent to a condenser (not shown) here.

  Here, with reference to FIG. 1C again, the operation of the scroll compressor 10 having the above-described configuration will be described. First, the inverter circuit incorporated in the inverter board 15 converts the power supplied from the external power supply into AC power of a predetermined frequency. The motor 16 rotates at a predetermined speed in a predetermined direction by being supplied with the AC power. The motor 16 rotates the shaft 18. As the shaft 18 rotates, the fan 17 also rotates to blow air.

  When the fan 17 rotates, part of the refrigerant taken in from the inlet 13 is introduced into the introduction space 30. Here, when the inlet 13 is viewed from the left, the rear portion of the inlet 13 is disposed at a position overlapping the motor 16, and the front portion of the inlet 13 is disposed forward of the front end of the motor 16 Ru. That is, the front portion of the inlet 13 is formed on the left of the introduction space 30 formed in front of the motor 16.

  The refrigerant introduced into the casing 31 from the rear portion of the inlet 13 is not introduced into the introduction space 30 but travels rearward, and between the outer side surface of the motor 16 and the inner side surface of the front casing portion 11 Through the gap between the two and reach the flow space 35 formed at the rear of the motor 16. The refrigerant flows through the gap between the outer side surface of the motor 16 and the inner side surface of the front casing portion 11, whereby the motor 16 is cooled by the refrigerant. Thus, the motor 16 rotating at high speed is prevented from being overheated.

  On the other hand, the refrigerant introduced into the inside of the casing 31 from the front portion of the inlet 13 is introduced into the introduction space 30 formed in front of the motor 16. A partition wall 32 is formed in front of the introduction space 30, and a storage space 33 in which the inverter board 15 is stored is formed in front of the partition wall 32. Therefore, when the refrigerant is introduced into the introduction space 30, the storage space 33 is cooled by the refrigerant via the partition wall 32, and as a result, the inverter substrate 15 built in the storage space 33 is cooled. Therefore, although a large amount of heat energy is generated from the inverter substrate 15 by converting a large current, the inverter substrate 15 is overheated by cooling the inverter substrate 15 with the refrigerant via the partition wall 32 and the introduction space 30. Can be efficiently converted by the inverter circuit incorporated in the inverter substrate 15. The refrigerant that has cooled the inverter substrate 15 in the introduction space 30 passes through the gap between the lower portion of the motor 16 and the lower portion of the inner side surface of the front casing portion 11 and flows into the flow space 35 as described above. Here, in FIG. 1C, the inverter board 15 is disposed on the front side in the storage space 33, but the inverter board 15 is disposed on the rear side of the storage space 33, and the partition wall 32 is formed. It may be in contact with the entire surface of

  The refrigerant that has passed rearward through the gap between the motor 16 and the front casing portion 11 moves to the flow space 35 and is then blown rearward by the fan 17 rotating with the shaft 18. Thereafter, the refrigerant is introduced into the compression space 43 formed between the movable scroll 20 and the fixed scroll 21 via the communication port 28 formed in the inner housing 19. In this embodiment, as described above, since the refrigerant is blown rearward by the fan 17 rotating at high speed and the refrigerant is introduced into the compression space 43, a so-called addition state can be created. Therefore, in the compression space 43, the refrigerant introduced in a compressed state is further compressed, and the compression rate of the scroll compressor 10 as a whole can be improved. Further, since the fan 17 for feeding is rotated by the existing shaft 18, a dedicated member for rotating the fan 17 becomes unnecessary, and the increase in the number of parts and the complication of the structure are suppressed.

  Thereafter, the turning mechanism 23 converts the rotational movement of the shaft 18 into a turning movement, whereby the movable scroll 20 turns, and as a result, the refrigerant moves to the central portion while being compressed. Thereafter, the refrigerant which has been sufficiently compressed moves from the discharge port 24 where the valve body 25 is released to the discharge space 34 and is discharged to the outside via the exhaust port 14.

  Referring to FIG. 3, the inner housing 19 has a substantially circular shape in a front view, and the communication port 28 is formed by partially opening the inner housing 19. Here, two communication ports 28 are formed in the vicinity of the outer peripheral portion of the inner housing 19. Here, the communication port 28 is hatched.

  The communication port 28 is formed on the radially outer side of the inner housing 19. By so doing, the refrigerant can be supplied to the radially outer portion of the movable scroll 20 shown in FIG. 1 through the communication port 28.

  Furthermore, the communication port 28 has a symmetrical position and shape. Specifically, the communication port 28 is disposed at a point-symmetrical position with respect to the center point 41 of the inner housing 19. Here, the communication ports 28 are disposed at the upper end and the lower end, but may be disposed at other point symmetrical positions. In this way, when the refrigerant flows from the introduction space 30 to the distribution space 35, the refrigerant can be distributed over substantially the entire periphery of the motor 16, and the motor 16 can be cooled efficiently. .

  Furthermore, the communication port 28 has a point-symmetrical shape with respect to the center point 41 of the inner housing 19. Moreover, the communication port 28 is formed to be elongated along the circumferential direction. By so doing, the refrigerant can be uniformly supplied to the peripheral portion of the movable scroll 20. Here, the number of the communication ports 28 may be other than two, and, for example, three or more communication ports 28 may be formed symmetrically.

  The related configuration of the front casing portion 11 and the motor 16 will be described with reference to FIG. This figure partially shows the cross section of the front casing portion 11 and the motor 16.

  The motor 16 is composed of a rotor 36 that rotates with the shaft 18 and a stator 37 circumferentially disposed around the rotor 36. For example, a permanent magnet is disposed near the edge of the rotor 36, an electromagnet is disposed on the stator 37, and a current is supplied from the inverter board 15 to the electromagnet of the stator 37 to make the rotor 36 It rotates with the shaft 18.

  Further, the motor 16 is incorporated in the front casing portion 11. The contact portion 38 is formed by partially projecting the inner wall of the front casing portion 11 radially inward. The sectional shape of the contact portion 38 is a substantially rectangular shape whose circumferential length is longer than that in the radial direction. A plurality of contact portions 38 are formed at substantially equal intervals along the circumferential direction of the front casing portion 11. Further, the contact portion 38 is formed from the front end to the rear end of the motor 16.

  The radially inner end face of the abutment portion 38 presents a flat surface or a curved surface that is recessed outward. The radially inner end face of the contact portion 38 contacts the radially outer side surface of the stator 37 of the motor 16 to fix the position of the motor 16 inside the front casing portion 11.

  As described above, by fixing the motor 16 with the contact portion 38 formed on the inner side surface of the front casing portion 11, a gap 42 is formed between the inner side surface of the front casing portion 11 and the outer side surface of the motor 16. can do. The gap 42 is formed from the front end to the rear end of the motor 16. Under the operating condition of the scroll compressor 10, the refrigerant flows through the gap 42. Therefore, the motor 16 is cooled by the refrigerant flowing through the gap 42, and the motor 16 can be prevented from being overheated.

  The related configuration of the front casing portion 11 and the stator 37 will be described with reference to FIG. 5A is a perspective view showing the front casing portion 11 and the stator 37, and FIG. 5B is an enlarged perspective view showing the contact portion 38 formed on the inner side surface of the front casing portion 11. As shown in FIG.

  Referring to FIG. 5A, the stator 37 constituting the motor 16 described above is in contact with the inner surface of the contact portion 38 in which the inner surface of the front casing portion 11 is raised radially inward. Here, the inner diameter of the front casing portion 11 in the portion where the contact portion 38 (the second contact portion 45 described later) is formed is smaller than the outer diameter of the corresponding portion of the stator 37. This is to secure a large interference in order to fix the stator 37 firmly. Therefore, when inserting the stator 37 into the inside of the front casing portion 11, so-called shrink fitting is performed. Specifically, by heating the front casing portion 11 to a high temperature of, for example, about 200 ° C., the front casing portion 11 is thermally expanded to form a contact portion 38 (a second contact portion 45 described later). The inner diameter of the front casing portion 11 is larger than the outer diameter of the stator 37. In this state, the stator 37 is inserted into the front casing portion 11. Thereafter, when the front casing portion 11 is cooled to normal temperature, the front casing portion 11 is thermally shrunk, and the contact portion 38 of the front casing portion 11 abuts firmly on the outer surface of the stator 37. Thereby, the position of the stator 37 in the inside of the front casing portion 11 is accurately and firmly fixed.

  With reference to FIG. 5 (B), the contact part 38 is comprised from the 1st contact part 44 which forms a front part, and the 2nd contact part 45 which forms a back part. The height at which the first contact portion 44 bulges radially inward from the inner surface of the front casing portion 11 is higher than the height at which the second contact portion 45 bulges radially inward from the inner surface of the front casing portion 11 Too high. Thus, the stepped portion 47 is formed between the rear end of the first contact portion 44 and the front end of the second contact portion 45. When the inner side surface of the second contact portion 45 contacts the outer surface of the stator 37 described above, the radial position of the stator 37 is fixed. Further, the front end portion of the stator 37 abuts on the step portion 47, whereby the position of the stator 37 is defined in the front-rear direction. Thus, in the region where the abutting portion 38 is not formed, the above-described gap 42 is formed between the inner surface of the front casing portion 11 and the outer surface of the stator 37. The length of the gap 42 in the radial direction is equal to the protruding height of the second contact portion 45. In other words, the first contact portion 44 fixes the motor 16 along the axial direction. The second contact portion 45 fixes the motor 16 along the axial direction.

  A recess 46 is formed between the rear end of the first contact portion 44 and the front end of the second contact portion 45. The concave portion 46 is formed continuously from one end of the abutting portion 38 to the other end in the circumferential direction. The protruding height of the contact portion 38 in the portion where the concave portion 46 is formed is lower than that of the second contact portion 45. By forming the concave portion 46, the process of shrink fitting the stator 37 can be made smooth.

  As mentioned above, although embodiment of this invention was shown, this invention is not limited to the said embodiment.

DESCRIPTION OF SYMBOLS 10 scroll compressor 11 front casing part 12 front casing 13 intake 14 exhaust port 15 inverter board 16 motor 17 fan 18 shaft 19 internal housing 20 movable scroll 21 fixed scroll 22 rear case 23 turning mechanism 24 discharge port 25 valve body 26 rear casing Part 27 Center line 28 Communication port 29 Rear casing part 30 Introduction space 31 Casing 32 Division wall 33 Storage space 34 Discharge space 35 Distribution space 36 Rotor 37 Stator 38 Contact part 40 Storage part 41 Center point 42 Gap 43 Compression space 44 First contact portion 45 Second contact portion 46 Concave portion 47 Stepped portion

Claims (4)

In the fixed scroll fixed to the compressor body side, the movable scroll rotatably disposed with respect to the fixed scroll, a compression space formed as a gap between the fixed scroll and the movable scroll, and the movable scroll A shaft for giving a driving force, a fan attached to the shaft, a casing, and a motor for rotating the shaft,
The scroll compressor, wherein the fan rotates with the shaft to introduce the fluid introduced into the casing into the compression space. An inner housing is provided between the fixed scroll and the movable scroll and the fan to define an inner space of the casing.
The scroll compressor according to claim 1, wherein a flow port through which the fluid flows is formed in the inner housing.   The scroll compressor according to claim 1 or 2, further comprising an inlet through which the fluid is introduced into the interior of the casing. The scroll compressor according to any one of claims 1 to 3, wherein the casing has an abutment portion in which an inner side surface thereof partially protrudes radially inward.

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