JP2015063977A - Multi-cylinder rotary compressor, and refrigeration cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abrasion loss at the extremity end of one split blade from increasing more than that of the another split blade in a multi-cylinder rotary compressor having split blades for compartmenting an inside region of each of cylinder chambers into a suction chamber and a compression chamber.SOLUTION: This invention relates to a multi-cylinder rotary compressor 4 in which a compression mechanism 11 has two compression elements 16a, 16b in an axial direction of a rotary shaft 12, the compression elements have blades for compartmenting inside regions of cylinder chambers 19a, 19b into suction chambers and a compression chambers, respectively, and the rotary shaft 12 is supported by paired bearings 18a, 18b at both sides of the compression mechanism 11. Each of the blades sets is constituted of two split blades 22, 23 that are stacked in an axial direction of the rotary shaft 12, one split blades set is pushed by a spring 24 at extremity ends of the blades in such a direction as one in which the split blades are abutted against an outer circumferential surface of a roller 21a, and the another, against a roller 21b, and a hardness of the extremity end of one split blade 22 of the two split blades positioned on the bearing side is higher than a hardness of the extremity end of the another split blade 23.

Description

  Embodiments described herein relate generally to a multi-cylinder rotary compressor and a refrigeration cycle apparatus.

  Conventionally, an electric motor part and a compression mechanism part driven by a rotary shaft connected to the electric motor part are accommodated in a sealed case, and the compression mechanism part has a multi-cylinder rotary type having two compression elements in the axial direction of the rotary shaft. Compressors are known. Each compression element slides while being pressed in a direction in which a cylinder forming a cylinder chamber, a roller fitted into an eccentric portion of the rotating shaft and rotating eccentrically in the cylinder chamber, and a tip portion contacting the outer peripheral surface of the roller Thus, the cylinder chamber is constituted by a blade or the like that partitions the suction chamber and the compression chamber. The rotating shaft is pivotally supported by a pair of bearings arranged on both sides of the compression mechanism.

  In such a multi-cylinder rotary compressor, the rotating shaft may bend due to swinging or a gas load, and the roller may be tilted by the bending. When the roller is tilted, a part of the tip of the blade comes into contact with the outer peripheral surface of the roller, resulting in abnormal wear and seizure of the blade.

  Therefore, in order to suppress abnormal wear and seizure due to contact of the tip of the blade with the outer peripheral surface of the roller, the blade is formed by two divided blades provided in the axial direction of the rotating shaft, and the two divided blades. There is known a multi-cylinder rotary compressor that is pressed so as to be brought into contact with the outer peripheral surface of a roller using a single spring (see Patent Document 1 below).

Japanese Patent No. 4488104

  However, in a configuration in which the two split blades are pressed using one spring and the tip of the split blade is in contact with the outer peripheral surface of the roller, one of the two split blades located on the bearing side There is a problem that the amount of wear at the tip is greater than the amount of wear at the tip of the other split blade.

  An object of the present invention is to provide a pair of divided blades each having two compression elements, each of which is provided by overlapping the blades of the respective compression elements in the axial direction of the rotating shaft so that the front end portions thereof abut against the outer peripheral surface of the roller. In a multi-cylinder rotary compressor that is pressed by one spring, the amount of wear at the tip of one split blade is suppressed from being greater than the amount of wear at the tip of the other split blade, and the reliability of the compression performance is improved. It is an object of the present invention to provide a multi-cylinder rotary compressor and a refrigeration cycle apparatus including the multi-cylinder rotary compressor.

  In the multi-cylinder rotary compressor of the embodiment, an electric motor part and a compression mechanism part driven by a rotary shaft connected to the electric motor part are accommodated in a hermetically sealed case, and the compression mechanism part is arranged in the axial direction of the rotary shaft. The compression element includes a cylinder that forms a cylinder chamber, a roller that is fitted in the eccentric portion of the rotation shaft and rotates eccentrically in the cylinder chamber, and a direction in which the tip portion contacts the outer peripheral surface of the roller. Multi-cylinder rotary compression having a blade that partitions the cylinder chamber into a suction chamber and a compression chamber by being pressed and slid, and whose rotation shaft is supported by a pair of bearings on both sides of the compression mechanism In the machine, the blade is composed of two divided blades that are stacked in the axial direction of the rotating shaft, and the two divided blades are pressed by a single spring in the direction in which the tip part comes into contact with the outer peripheral surface of the roller, Blur The hardness of the tip portion of one of the split blade located on the bearing side of the de is equal to or higher than the hardness of the tip portion of the other split blade.

It is a lineblock diagram of the refrigerating cycle device containing the multi-cylinder rotary compressor shown in the section in a 1st embodiment. It is a top view which shows the structure of one division | segmentation blade in 2nd Embodiment. It is a top view which shows the structure of the other division | segmentation blade. It is a side view which shows the structure of the division | segmentation blade in 3rd Embodiment.

(First embodiment)
A first embodiment will be described with reference to FIG. FIG. 1 shows a refrigeration cycle apparatus 1. This refrigeration cycle apparatus 1 includes a compressor main body 2 and an accumulator 3, a multi-cylinder rotary compressor 4 that compresses a gas refrigerant as a working fluid, and a compression A condenser 5 connected to the machine main body 2 to condense the high-pressure gas refrigerant discharged from the compressor main body 2 into a liquid refrigerant, an expansion device 6 connected to the condenser 5 to depressurize the liquid refrigerant, and expansion It has the evaporator 7 connected between the apparatus 6 and the accumulator 3, and evaporating a liquid refrigerant. The accumulator 3 and the compressor body 2 are connected by a suction pipe 8 through which a gas refrigerant flows.

  The compressor body 2 has a sealed case 9 formed in a cylindrical shape, and an electric motor unit 10 located on the upper side and a compression mechanism unit 11 located on the lower side are accommodated in the sealed case 9. Yes. The electric motor unit 10 and the compression mechanism unit 11 are connected via a rotating shaft 12 having a vertical center line and rotating around the center line. The rotary shaft 12 is pivotally supported by a pair of bearings (a main bearing and a sub-bearing) which will be described later disposed on both sides of the compression mechanism unit 11.

  The electric motor unit 10 is a part that drives the compression mechanism unit 11. The electric motor unit 10 includes a rotor 13 that is fixed to the rotary shaft 12 and a stator 14 that is fixed to the sealing case 9 and disposed at a position surrounding the rotor 13. Have. The rotor 13 is provided with a permanent magnet (not shown), and a current-carrying coil (not shown) is wound around the stator 14.

  The compression mechanism part 11 is a part which compresses a gas refrigerant, and has two compression elements, the 1st compression element 16a and the 2nd compression element 16b which are located up and down via the partition plate 15. FIG.

  The first compression element 16a located on the upper side has a first cylinder 17a, the lower end side of the first cylinder 17a is closed by the partition plate 15, and the upper end side of the first cylinder 17a is supported so that the rotary shaft 12 can rotate. The main bearing 18a, which is a bearing to be closed, is closed. A first cylinder chamber 19a is formed in the first cylinder 17a by closing the upper and lower ends of the first cylinder 17a with the main bearing 18a and the partition plate 15. The first cylinder chamber 19a and a second cylinder chamber, which will be described later, pass through the rotary shaft 12, and a first eccentric portion 20a is formed in a portion of the rotary shaft 12 located in the first cylinder chamber 19a. The first roller 21a is fitted to the portion 20a. The first roller 21a is arranged to rotate eccentrically while the outer peripheral surface thereof is in line contact with the inner peripheral surface of the first cylinder 17a when the rotary shaft 12 rotates. Further, the first cylinder chamber 19a is divided into a suction chamber and a compression chamber by being pressed and slid in the direction in which the front end is in contact with the outer peripheral surface of the first roller 21a. Dividing blades 22 and 23 are provided. These split blades 22 and 23 are provided so as to overlap in the axial direction of the rotary shaft 12, and the split blades 22 and 23 are disposed on the rear end side of the split blades 22 and 23, and the tip ends of the first rollers 21 a. One spring 24 is provided that presses in a direction to contact the outer peripheral surface. The first compression element 16a includes the first cylinder 17a, the first eccentric portion 20a, the first roller 21a, the divided blades 22 and 23, the spring 24, and the like.

  The second compression element 16b located on the lower side has the same configuration as the first compression element 16a described above, and has a second cylinder 17b. The upper end side of the second cylinder 17b is closed by the partition plate 15, The lower end side of the cylinder 17b is closed by a secondary bearing 18b that is a bearing that rotatably supports the rotary shaft 12. A second cylinder chamber 19b is formed in the second cylinder 17b by closing the upper and lower ends of the second cylinder 17b with the partition plate 15 and the auxiliary bearing 18b. The rotating shaft 12 is penetrated through the second cylinder chamber 19b, and a second eccentric portion 20b is formed in a portion of the rotating shaft 12 located in the second cylinder chamber 19b. The second eccentric portion 20b includes a second roller. 21b is fitted. The second roller 21b is arranged to rotate eccentrically while the outer peripheral surface thereof is in line contact with the inner peripheral surface of the second cylinder 17b when the rotary shaft 12 rotates. Further, the second cylinder chamber 19b is divided into a suction chamber and a compression chamber by being pressed and slid in the second cylinder chamber 19b in a direction in which the front end is in contact with the outer peripheral surface of the second roller 21b. Dividing blades 22 and 23 are provided. These split blades 22 and 23 are provided so as to overlap in the axial direction of the rotary shaft 12, and the split blades 22 and 23 are disposed on the rear end side of the split blades 22 and 23, and the tip ends of the second rollers 21 b. One spring 24 is provided that presses in a direction to contact the outer peripheral surface. The second compression element 16b includes the second cylinder 17b, the second eccentric portion 20b, the second roller 21b, the divided blades 22 and 23, the spring 24, and the like.

  The main bearing 18a is formed with a first discharge hole 25a through which the gas refrigerant compressed in the first compression element 16a is discharged, and the gas refrigerant compressed in the second compression element 16b is discharged into the auxiliary bearing 18b. A second discharge hole 25b is formed. The main bearing 18a is provided with a first discharge valve device 26a for opening and closing the first discharge hole 25a, and the sub-bearing 18b is provided with a second discharge valve device 26b for opening and closing the second discharge hole 25b. Yes. Further, a first muffler 27a is attached to the main bearing 18a so as to cover the first discharge valve device 26a and into which the gas refrigerant discharged from the first discharge hole 25a flows. A second muffler 27b into which the gas refrigerant discharged from the second discharge hole 25b flows is attached to the auxiliary bearing 18b so as to cover the second discharge valve device 26b. In the first muffler 27a and the second muffler 27b, a communication path (not shown) formed through the auxiliary bearing 18b, the second cylinder 17b, the partition plate 15, the first cylinder 17a, and the main bearing 18a. It is communicated by. The first muffler 27 a is formed with a communication hole 28 through which the gas refrigerant that has flowed into the first and second mufflers 27 a and 27 b flows into the sealed case 9.

  The first discharge valve device 26a is fixed to the main bearing 18a to open and close the first discharge hole 25a, and the first reed valve device 26a is fixed to the main bearing 18a to restrict the maximum opening of the first reed valve 29a. 1 valve presser 30a.

  The second discharge valve device 26b is a second reed valve 29b that is fixed to the sub bearing 18b and opens and closes the second discharge hole 25b, and a second reed valve 29b that is fixed to the sub bearing 18b and restricts the maximum opening of the second reed valve 29b. 2 valve presser 30b.

  The two divided blades 22 and 23 are different from each other in the material of the base material, and further, the coating treatment at the tip portion is different. Of the two divided blades 22 and 23, one of the divided blades 22 located on the main bearing 18a side or the auxiliary bearing 18b side is formed of a high-speed tool steel (SKH51) and has a diamond-like carbon at the tip. (DLC) film treatment is applied. The other split blade 23 is made of stainless steel (SUS440C) as a base material, and a chromium nitride (CrN) film treatment is applied to the tip. Note that the tip of the split blade 23 may be subjected to nitriding instead of the chromium nitride coating. The hardness of the tip of one of the divided blades 22 with the diamond-like carbon coating applied to the tip is equal to the hardness of the tip of the other divided blade 23 with the chromium nitride film coating or nitriding applied to the tip. Higher than hardness and high wear resistance. For example, a diamond-like carbon film has a Vickers hardness of about Hv 2500, whereas a chromium nitride film has a Vickers hardness of about Hv 2000, and a nitriding-treated film has a Vickers hardness of Hv 1200. Degree.

  In addition, it is conceivable that the other split blade 23 is also formed of a high-speed tool steel as a base material and subjected to a diamond-like carbon coating on the tip. However, since the diamond-like carbon coating treatment is significantly higher than the chromium nitride coating treatment and nitriding treatment, if all the divided blades 22, 23 are subjected to diamond-like carbon coating treatment, The cost of the entire rotary compressor 4 is increased.

  Further, the tip of the two divided blades 22 and 23 is coated with a film of manganese phosphate or a film of molybdenum disulfide on the surface of a diamond-like carbon (DLC) film or a chromium nitride (CrN) film. Further processing has been applied. The manganese phosphate coating and the molybdenum disulfide coating are soft and improve initial conformability.

  In such a configuration, in the multi-cylinder rotary compressor 4, when the electric motor unit 10 is energized, the rotation shaft 12 rotates around the center line, and the rotation of the rotation shaft 12 drives the compression mechanism unit 11. The gas refrigerant is compressed in the first and second compression elements 16a and 16b.

  When the pressure of the compressed gas refrigerant reaches the set pressure, the first and second reed valves 29a and 29b of the first and second discharge valve devices 26a and 26b are opened, and the compressed gas refrigerant is transferred to the first and second reed valve devices 26a and 26b. The ink is discharged from the second discharge holes 25a and 25b into the first and second mufflers 27a and 27b. The high-pressure gas refrigerant discharged into the first and second mufflers 27 a and 27 b passes through the communication hole 28 and flows into the sealed case 9. The high-pressure gas refrigerant that has flowed into the sealed case 9 is circulated again to the multi-cylinder rotary compressor 4 through the condenser 5, the expansion device 6, and the evaporator 7 in order, so that the refrigeration cycle is executed. .

  When the rotating shaft 12 rotates to drive the compression mechanism unit 11, the rotating shaft 12 is bent due to the swing of the rotor 13 or a gas load, and the first and second rollers 21a and 21b are inclined by the bending. There is a case. When the first and second rollers 21a and 21b are inclined, a part-contact state in which a part of the tip portions of the divided blades 22 and 23 abut against the outer peripheral surfaces of the first and second rollers 21a and 21b is brought about. However, since the split blades 22 and 23 are provided so as to overlap each other in the axial direction of the rotary shaft 12 even in the one-sided state, the tip portions of the split blades 22 and 23 are compared with the case where only one blade is used. And the outer surface of the first and second rollers 21a and 21b are reduced, and abnormal wear and seizure of the divided blades 22 and 23 are suppressed.

  In addition, since the two split blades 22 and 23 are pressed by using one spring 24 in a direction in which the tip portions thereof contact the outer peripheral surfaces of the first and second rollers 21a and 21b, the size of the spring 24 is increased. Therefore, the design freedom of the spring 24 can be increased.

  When the divided blades 22 and 23 are pressed against the first and second rollers 21a and 21b using a single spring 24, the tip of one of the divided blades 22 located on the main bearing 18a side or the auxiliary bearing 18b side is provided. The part is more easily worn than the tip of the other split blade 23. This is presumably because the sliding conditions of the two divided blades 22 and 23 are different, for example, the amount of movement in the sliding direction is restricted. However, of the two split blades 22 and 23, the hardness of the tip of one split blade 22 which is located on the main bearing 18a side or the sub-bearing 18b side and whose tip is coated with diamond-like carbon is It is higher than the hardness of the tip of the other split blade 23 having the tip treated with a chromium nitride film. For this reason, it is possible to suppress the amount of wear at the tip of one split blade 22 from being greater than the amount of wear at the tip of the other split blade 23, and the wear amounts of the two split blades 22 and 23 are substantially equal. The reliability of the compression performance of the multi-cylinder rotary compressor 4 can be improved.

  Further, the tip of the two split blades 22 and 23 is coated with diamond-like carbon (DLC) or chromium nitride (CrN) and then with manganese phosphate or molybdenum disulfide. Since the processing is performed, the initial conformability of the split blades 22 and 23 is improved, and the split blades 22 and 23 and the first and second rollers are caused by the initial surface roughness of the tip portions of the split blades 22 and 23. Abnormal wear and seizure of 21a and 21b can be prevented.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. In addition, in 2nd Embodiment and 3rd Embodiment demonstrated below, the same code | symbol is attached | subjected to the same component as the component demonstrated in 1st Embodiment, and the overlapping description is abbreviate | omitted.

  The basic configuration of the multi-cylinder rotary compressor of the second embodiment is the same as that of the multi-cylinder rotary compressor 4 of the first embodiment, and the difference is the shape of the divided blades 22A and 23A.

  Of the divided blades 22A and 23A, one of the divided blades 22A located on the main bearing 18a side or the auxiliary bearing 18b side is made of a high-speed tool steel (SKH51) as in the case of the divided blade 22 of the first embodiment. The tip portion is coated with diamond-like carbon (DLC). The other split blade 23A is formed of stainless steel (SUS440C) as a base material, and the tip portion is subjected to a coating process of chromium nitride (CrN), like the split blade 23 of the first embodiment. ing.

  Further, in the second embodiment, the curvature radius “R1” of the tip portion of one split blade 22A shown in FIG. 2 is equal to the curvature radius “R2” of the tip portion of the other split blade 23A shown in FIG. It is formed larger.

  In such a configuration, the curvature radius “R1” of the tip of one split blade 22A located on the main bearing 18a side or the sub-bearing 18b side is larger than the curvature radius “R2” of the tip of the other split blade 23A. In the divided blade 22A, the surface pressure at the contact point with the outer peripheral surfaces of the first and second rollers 21a and 21b is reduced. As a result, the amount of wear at the tip of one split blade 22A is prevented from being greater than the amount of wear at the tip of the other split blade 23A, and the wear of the two split blades 22A and 23A is made substantially equal. Thus, the reliability of the compression performance of the multi-cylinder rotary compressor 4 can be improved.

(Third embodiment)
A third embodiment will be described with reference to FIG.

  The basic configuration of the multi-cylinder rotary compressor of the third embodiment is the same as that of the multi-cylinder rotary compressor 4 of the first embodiment, and the difference is the shape of the divided blades 22B and 23B.

  Of the divided blades 22B and 23B, one of the divided blades 22B located on the main bearing 18a side or the auxiliary bearing 18b side is made of a high-speed tool steel (SKH51) as in the case of the divided blade 22 of the first embodiment. The tip portion is coated with diamond-like carbon (DLC). The other split blade 23B is formed of stainless steel (SUS440C) as a base material, and the tip portion is subjected to a coating process of chromium nitride (CrN), similarly to the split blade 23 of the first embodiment. ing.

  Further, in the third embodiment, three protrusions a, b, a are formed at the rear end of one split blade 22B, and two protrusions a, a are formed at the rear end of the other split blade 23B. Is formed. The protrusion a of the split blade 22B and the protrusion a of the split blade 23B are formed in the same shape. The tip of the spring 24 is engaged across one protrusion a of the split blade 22B and the protrusion a of the split blade 23B.

  In such a configuration, when the compression mechanism portion 11 is assembled, it is necessary to position the divided blade 22B on the main bearing 18a side or the sub bearing 18b side. Therefore, by making the shape of the rear end portion of the split blade 22B different from the shape of the rear end portion of the split blade 23B, the split blade 22B is surely positioned on the main bearing 18a side or the auxiliary bearing 18b side during assembly. It is possible to improve the efficiency of the assembly work and improve the accuracy of the assembly work.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle apparatus, 4 ... Multi-cylinder rotary compressor, 5 ... Condenser, 6 ... Expansion device, 7 ... Evaporator, 9 ... Sealing case, 10 ... Electric motor part, 11 ... Compression mechanism part, 12 ... Rotating shaft , 16a ... 1st compression element, 16b ... 2nd compression element, 17a ... 1st cylinder, 17b ... 2nd cylinder, 18a ... Main bearing (bearing), 18b ... Sub bearing (bearing), 19a ... 1st cylinder chamber, 19b ... 2nd cylinder chamber, 20a ... 1st eccentric part, 20b ... 2nd eccentric part, 21a ... 1st roller, 21b ... 2nd roller, 22, 23 ... Split blade, 24 ... Spring

Claims (6)

An electric motor unit and a compression mechanism unit driven by a rotary shaft connected to the motor unit are accommodated in a sealed case, and the compression mechanism unit has two compression elements in the axial direction of the rotary shaft, and the compression unit The elements are slid by being pressed in a direction in which a cylinder that forms a cylinder chamber, a roller that is fitted in an eccentric portion of the rotating shaft and rotates eccentrically in the cylinder chamber, and a tip portion that abuts on the outer peripheral surface of the roller. A multi-cylinder rotary compressor having a blade that divides the cylinder chamber into a suction chamber and a compression chamber by moving, and the rotary shaft is supported by a pair of bearings on both sides of the compression mechanism section ,
The blade is composed of two divided blades provided to overlap in the axial direction of the rotating shaft,
The two split blades are pressed by a single spring in a direction in which the tip part comes into contact with the outer peripheral surface of the roller,
The multi-cylinder rotary compressor characterized in that the hardness of the tip of one of the two divided blades located on the bearing side is higher than the hardness of the tip of the other divided blade.   The tip of one of the divided blades located on the bearing side is subjected to a diamond-like carbon film treatment, and the tip of the other divided blade is subjected to a nitriding treatment or a chromium nitride film treatment. The multi-cylinder rotary compressor according to claim 1.   3. The multi-cylinder rotary compressor according to claim 2, wherein a coating process of manganese phosphate or a coating process of molybdenum disulfide is further applied to a tip portion of at least one of the divided blades.   The curvature radius of the front-end | tip part of one said division | segmentation blade located in the said bearing side is larger than the curvature radius of the front-end | tip part of the other said division | segmentation blade, The description in any one of Claim 1 thru | or 3 characterized by the above-mentioned. Multi-cylinder rotary compressor.   The multi-cylinder rotary compressor according to any one of claims 1 to 4, wherein a shape of a rear end portion of one of the divided blades is different from a shape of a rear end portion of the other of the divided blades. . The multi-cylinder rotary compressor according to any one of claims 1 to 5, a condenser connected to the multi-cylinder rotary compressor, an expansion device connected to the condenser, and the expansion device And an evaporator connected between the multi-cylinder rotary compressor.

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