JP5041057B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor that compresses a refrigerant.

  Conventionally, as a compressor, there is a rotary compressor including a cylinder and a roller disposed inside the cylinder. In this rotary compressor, the roller is mounted on a shaft that rotates eccentrically, and moves along the inner peripheral surface of the cylinder as the shaft rotates.

  In such a rotary compressor, a minute gap is provided between an end face of the roller and an end plate member disposed to face the end face to prevent seizure due to sliding. The size of the gap is preferably as small as possible from the viewpoint of preventing leakage of refrigerant and lubricating oil. However, even if such a gap is provided, if the amount of thermal expansion of the roller is larger than that of the cylinder, for example, when the compressor is started at high speed, the gap may disappear and seizure may occur.

  For example, in Patent Document 1, it is proposed to improve the slidability by resin coating to deal with such a problem of seizure of the compressor. Thereby, it is possible to prevent seizure without increasing the size of the gap.

JP 2006-275280 A

However, when sliding occurs, in addition to the above-mentioned problem of seizure, there also arises a problem that the efficiency of the compressor decreases due to friction loss.
In the compressor of Patent Document 1, seizure during sliding can be prevented by the resin coating, but there remains a problem of efficiency reduction due to this friction loss. Furthermore, since the resin coating layer swells by absorbing the refrigerant and the lubricating oil, there is a case where there is no gap not only during the special operation such as the above-described high speed start but also during the normal operation. For this reason, when the surface of the resin coating slides in contact with the opposing member, there is a problem that friction loss due to sliding increases.

  Then, this invention aims at providing the compressor which can reduce the friction loss by sliding, when the surface of a resin layer contacts and contacts the opposing member and slides.

In order to solve the above problems, in the compressor according to the first invention, a cylinder having a compression chamber and a blade accommodating portion communicating with the compression chamber, first end plate members disposed at both upper and lower ends of the cylinder, and A second end plate member; and a piston disposed inside the compression chamber and the blade accommodating portion, the piston extending from an outer peripheral surface of the roller and an annular roller disposed in the compression chamber And a blade disposed so as to be able to advance and retreat relative to the blade accommodating portion, and a resin layer is formed on the entire surface of the upper end surface and the lower end surface of the piston, respectively, The surface of the end plate member facing the upper end surface of the piston and the surface of the second end plate member facing the lower end surface of the piston have higher hardness than the resin layer, and the first end plate member Of the above The arithmetic average surface roughness Ra of the surface facing the upper end surface of the stone is 0.3 or more, and the arithmetic average surface roughness Ra of the surface facing the lower end surface of the piston of the second end plate member Is also large.

In this compressor, when the upper and lower end surfaces of the piston and the end plate member slide in contact with each other, seizure can be prevented by the resin layers provided on the upper and lower end surfaces of the piston.
Further, the surface of the first end plate member that faces the upper end surface of the piston is harder than the resin layer and has a rough surface, so that it slides in contact with the resin layer on the upper end surface of the piston. When this is done, the surface of the resin layer is scraped until the surface pressure becomes almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of a compressor can be suppressed.
In the compressor of the present invention, the direction in which the axial end surfaces of the cylinders are arranged vertically, that is, the direction in which the axial direction of the compression chamber is a vertical direction (or a direction other than the vertical direction and inclined with respect to the horizontal direction). Is arranged. Therefore, due to the gravity of the piston, the lower end surface of the piston and the upper surface of the second end plate member are relatively in contact with each other, and the surface roughness of the first end plate member and the second end plate member is the same. The resin layer on the lower end surface is easier to scrape than the resin layer on the upper end surface of the piston. In the present invention, the arithmetic average surface roughness Ra of the surface of the first end plate member facing the upper end surface of the piston is calculated from the arithmetic average surface roughness Ra of the surface of the second end plate member facing the lower end surface of the piston. Therefore, it is possible to prevent the resin layer on the lower end surface of the piston from being scraped too much than the resin layer on the upper end surface of the piston.

In the compressor according to the second invention, in the compressor according to the first invention, the arithmetic average surface roughness Ra of the surface of the second end plate member facing the lower end surface of the piston is less than 0.3. It is characterized by being.

  In this compressor, it is possible to prevent the resin layer on the lower end surface of the piston from being excessively shaved.

  In the compressor according to the fourth invention, a cylinder having a compression chamber and a blade accommodating portion communicating with the compression chamber, a first end plate member and a second end plate member disposed at both upper and lower ends of the cylinder, A compression chamber and a piston disposed inside the blade housing portion, the piston extending from an outer peripheral surface of the roller and the blade housing portion with respect to the annular roller disposed in the compression chamber Blades arranged to be able to advance and retreat, and a surface of the first end plate member facing the upper end surface of the piston and a surface of the second end plate member facing the lower end surface of the piston. Resin layers are respectively formed on the entire surface, and the upper end surface of the piston and the lower end surface of the piston are harder than the resin layer, and the arithmetic average surface roughness of the upper end surface of the piston a is a 0.3 or more, being greater than the arithmetic average surface roughness Ra of the lower end surface of the piston.

In this compressor, when the upper and lower end surfaces of the piston and the end plate member slide in contact, the occurrence of seizure can be prevented by the resin layer provided on the end plate member.
Further, since the upper end surface of the piston is harder than the resin layer and has a rough surface, the surface of the resin layer when sliding in contact with the resin layer of the first end plate member Is removed until the surface pressure is almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of a compressor can be suppressed.
In the compressor of the present invention, the direction in which the axial end surfaces of the cylinders are arranged vertically, that is, the direction in which the axial direction of the compression chamber is a vertical direction (or a direction other than the vertical direction and inclined with respect to the horizontal direction). Is arranged. Therefore, due to the gravity of the piston, the lower end surface of the piston and the upper surface of the second end plate member are relatively easy to contact, and the second end plate member has the same surface roughness on the upper end surface and the lower end surface of the piston. This resin layer is easier to scrape than the resin layer of the first end plate member. In the present invention, since the arithmetic average surface roughness Ra of the upper end surface of the piston is larger than the arithmetic average surface roughness Ra of the lower end surface of the piston, the resin layer of the second end plate member is the first end surface. It can prevent that it cuts too much rather than the resin layer of a board member.

A compressor according to a fourth invention is characterized in that, in the compressor according to the third invention, the arithmetic average surface roughness Ra of the lower end face of the piston is less than 0.3.

  In this compressor, it is possible to prevent the resin layer of the second end plate member from being excessively shaved.

In the compressor according to the fifth invention, a cylinder having a compression chamber and a blade accommodating portion communicating with the compression chamber, a first end plate member and a second end plate member disposed at upper and lower ends of the cylinder, An annular roller disposed inside the compression chamber, and a vane having a tip pressed against the outer peripheral surface of the roller and disposed so as to be able to advance and retreat inside the vane housing portion. And a resin layer is formed on the entire surface of the lower end surface, the surface of the first end plate member facing the upper end surface of the roller, and the roller of the second end plate member. The surface facing the lower end surface is harder than the resin layer, and the arithmetic average surface roughness Ra of the surface facing the upper end surface of the roller of the first end plate member is 0.3 or more. , The roller of the second end plate member And greater than the arithmetic average surface roughness Ra of the surface facing the side end face.

In this compressor, when the upper and lower end surfaces of the roller and the end plate member slide in contact with each other, seizure can be prevented by the resin layers provided on the upper and lower end surfaces of the roller.
Further, the surface of the first end plate member that faces the upper end surface of the roller is harder than the resin layer and has a rough surface, so that it slides in contact with the resin layer on the upper end surface of the roller. When this is done, the surface of the resin layer is scraped until the surface pressure becomes almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of a compressor can be suppressed.
In the compressor of the present invention, the direction in which the axial end surfaces of the cylinders are arranged vertically, that is, the direction in which the axial direction of the compression chamber is a vertical direction (or a direction other than the vertical direction and inclined with respect to the horizontal direction). Is arranged. Therefore, due to the gravity of the roller, the lower end surface of the roller and the upper surface of the second end plate member are relatively in contact with each other, and the surface roughness of the first end plate member and the second end plate member is the same. The resin layer on the lower end surface is easier to scrape than the resin layer on the upper end surface of the roller. In the present invention, the arithmetic average surface roughness Ra of the surface of the first end plate member facing the upper end surface of the roller is calculated from the arithmetic average surface roughness Ra of the surface of the second end plate member facing the lower end surface of the roller. Therefore, the resin layer on the lower end surface of the roller can be prevented from being scraped too much than the resin layer on the upper end surface of the roller.

In the compressor according to the sixth invention, in the compressor according to the fifth invention, the second end plate member and the roller lower end surface arithmetic average surface roughness Ra of the opposing surfaces is less than 0.3 of It is characterized by being.

  In this compressor, it is possible to prevent the resin layer on the lower end surface of the roller from being excessively shaved.

In a compressor according to a seventh aspect of the present invention, a cylinder having a compression chamber and a blade accommodating portion communicating with the compression chamber, a first end plate member and a second end plate member disposed at both upper and lower ends of the cylinder, An annular roller disposed inside a compression chamber; and a vane having a tip pressed against an outer peripheral surface of the roller and disposed so as to be able to advance and retreat inside the vane housing portion. Resin layers are respectively formed on the entire surface of the member that faces the upper end surface of the roller and the surface of the second end plate member that faces the lower end surface of the roller. The upper end surface of the roller and the lower end surface of the roller are harder than the resin layer, and the arithmetic average surface roughness Ra of the upper end surface of the roller is 0.3 or more, and the lower side of the roller Arithmetic average surface roughness Ra Characterized in that also large.

In this compressor, when the upper and lower end surfaces of the roller and the end plate member slide in contact, the occurrence of seizure can be prevented by the resin layer provided on the end plate member.
Further, since the upper end surface of the roller is harder than the resin layer and has a rough surface, the surface of the resin layer when sliding in contact with the resin layer of the first end plate member. Is removed until the surface pressure is almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of a compressor can be suppressed.
In the compressor of the present invention, the direction in which the axial end surfaces of the cylinders are arranged vertically, that is, the direction in which the axial direction of the compression chamber is a vertical direction (or a direction other than the vertical direction and inclined with respect to the horizontal direction). Is arranged. Therefore, the lower end surface of the roller and the upper surface of the second end plate member are relatively in contact with each other due to the gravity of the roller, and the second end plate member has the same surface roughness on the upper end surface and the lower end surface of the roller. This resin layer is easier to scrape than the resin layer of the first end plate member. In the present invention, since the arithmetic average surface roughness Ra of the upper end surface of the roller is larger than the arithmetic average surface roughness Ra of the lower end surface of the roller, the resin layer of the second end plate member has the first end surface. It can prevent that it cuts too much rather than the resin layer of a board member.

A compressor according to an eighth aspect is characterized in that, in the compressor according to the seventh aspect, the arithmetic average surface roughness Ra of the lower end face of the roller is less than 0.3.

  In this compressor, it is possible to prevent the resin layer of the second end plate member from being excessively shaved.

  As described above, according to the present invention, the following effects can be obtained.

In the first invention, when the upper and lower end surfaces of the piston and the end plate member slide in contact with each other, seizure can be prevented by the resin layers provided on the upper and lower end surfaces of the piston.
Further, the surface of the first end plate member that faces the upper end surface of the piston is harder than the resin layer and has a rough surface, so that it slides in contact with the resin layer on the upper end surface of the piston. When this is done, the surface of the resin layer is scraped until the surface pressure becomes almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of a compressor can be suppressed.
In the compressor of the present invention, the direction in which the axial end surfaces of the cylinders are arranged vertically, that is, the direction in which the axial direction of the compression chamber is a vertical direction (or a direction other than the vertical direction and inclined with respect to the horizontal direction). Is arranged. Therefore, due to the gravity of the piston, the lower end surface of the piston and the upper surface of the second end plate member are relatively in contact with each other, and the surface roughness of the first end plate member and the second end plate member is the same. The resin layer on the lower end surface is easier to scrape than the resin layer on the upper end surface of the piston. In the present invention, the arithmetic average surface roughness Ra of the surface of the first end plate member facing the upper end surface of the piston is calculated from the arithmetic average surface roughness Ra of the surface of the second end plate member facing the lower end surface of the piston. Therefore, it is possible to prevent the resin layer on the lower end surface of the piston from being scraped too much than the resin layer on the upper end surface of the piston.

In the second invention, it is possible to prevent the resin layer on the lower end surface of the piston from being excessively shaved.

In the third invention, when the upper and lower end surfaces of the piston and the end plate member slide in contact with each other, the resin layer provided on the end plate member can prevent the occurrence of seizure.
Further, since the upper end surface of the piston is harder than the resin layer and has a rough surface, the surface of the resin layer when sliding in contact with the resin layer of the first end plate member Is removed until the surface pressure is almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of a compressor can be suppressed.
In the compressor of the present invention, the direction in which the axial end surfaces of the cylinders are arranged vertically, that is, the direction in which the axial direction of the compression chamber is a vertical direction (or a direction other than the vertical direction and inclined with respect to the horizontal direction). Is arranged. Therefore, due to the gravity of the piston, the lower end surface of the piston and the upper surface of the second end plate member are relatively easy to contact, and the second end plate member has the same surface roughness on the upper end surface and the lower end surface of the piston. This resin layer is easier to scrape than the resin layer of the first end plate member. In the present invention, since the arithmetic average surface roughness Ra of the upper end surface of the piston is larger than the arithmetic average surface roughness Ra of the lower end surface of the piston, the resin layer of the second end plate member is the first end surface. It can prevent that it cuts too much rather than the resin layer of a board member.

In the fourth invention, it is possible to prevent the resin layer of the second end plate member from being excessively shaved.

According to the fifth aspect, when the upper and lower end surfaces of the roller and the end plate member are in contact with each other and slide, the occurrence of seizure can be prevented by the resin layers provided on the upper and lower end surfaces of the roller.
Further, the surface of the first end plate member that faces the upper end surface of the roller is harder than the resin layer and has a rough surface, so that it slides in contact with the resin layer on the upper end surface of the roller. When this is done, the surface of the resin layer is scraped until the surface pressure becomes almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of a compressor can be suppressed.
In the compressor of the present invention, the direction in which the axial end surfaces of the cylinders are arranged vertically, that is, the direction in which the axial direction of the compression chamber is a vertical direction (or a direction other than the vertical direction and inclined with respect to the horizontal direction). Is arranged. Therefore, due to the gravity of the roller, the lower end surface of the roller and the upper surface of the second end plate member are relatively in contact with each other, and the surface roughness of the first end plate member and the second end plate member is the same. The resin layer on the lower end surface is easier to scrape than the resin layer on the upper end surface of the roller. In the present invention, the arithmetic average surface roughness Ra of the surface of the first end plate member facing the upper end surface of the roller is calculated from the arithmetic average surface roughness Ra of the surface of the second end plate member facing the lower end surface of the roller. Therefore, the resin layer on the lower end surface of the roller can be prevented from being scraped too much than the resin layer on the upper end surface of the roller.

In the sixth invention, it is possible to prevent the resin layer on the lower end face of the roller from being excessively shaved.

In the seventh invention, when the upper and lower end surfaces of the roller and the end plate member slide in contact with each other, the occurrence of seizure can be prevented by the resin layer provided on the end plate member.
Further, since the upper end surface of the roller is harder than the resin layer and has a rough surface, the surface of the resin layer when sliding in contact with the resin layer of the first end plate member. Is removed until the surface pressure is almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of a compressor can be suppressed.
In the compressor of the present invention, the direction in which the axial end surfaces of the cylinders are arranged vertically, that is, the direction in which the axial direction of the compression chamber is a vertical direction (or a direction other than the vertical direction and inclined with respect to the horizontal direction). Is arranged. Therefore, the lower end surface of the roller and the upper surface of the second end plate member are relatively in contact with each other due to the gravity of the roller, and the second end plate member has the same surface roughness on the upper end surface and the lower end surface of the roller. This resin layer is easier to scrape than the resin layer of the first end plate member. In the present invention, since the arithmetic average surface roughness Ra of the upper end surface of the roller is larger than the arithmetic average surface roughness Ra of the lower end surface of the roller, the resin layer of the second end plate member has the first end surface. It can prevent that it cuts too much rather than the resin layer of a board member.

In the eighth invention, it is possible to prevent the resin layer of the second end plate member from being excessively shaved.

1 is a schematic cross-sectional view of a compressor according to a first embodiment of the present invention. It is sectional drawing along the AA line of FIG. 1, Comprising: It is a figure which shows operation | movement of the piston in a cylinder. It is the figure which looked at the front head of the compressor shown in Drawing 1 from the lower part. It is a perspective view of the piston of the compressor shown in FIG. It is the figure which showed the partial enlarged view of FIG. 1 typically, Comprising: (a) shows the state which the resin layer is not swollen, (b) has shown the state where the resin layer is swollen. It is a schematic sectional drawing of the compressor which concerns on 2nd Embodiment of this invention. It is sectional drawing along the BB line of FIG. It is the figure which showed the partial enlarged view of FIG. 6 typically. It is a figure which shows operation | movement of the roller and vane in a cylinder in the compressor which concerns on 3rd Embodiment of this invention. It is a perspective view of the roller and vane of the compressor shown in FIG. It is sectional drawing along CC line of FIG. It is a top view of the piston of other embodiments of the present invention. It is a figure of the front head of other embodiment of this invention, Comprising: It is a figure corresponding to FIG.

<First Embodiment>
The first embodiment of the present invention will be described below.
The present embodiment is an example in which the present invention is applied to a one-cylinder rotary compressor.
As shown in FIG. 1, the compressor 1 of the present embodiment includes a sealed casing 2, a compression mechanism 10 and a drive mechanism 6 disposed in the sealed casing 2. In FIG. 1, hatching indicating a cross section of the drive mechanism 6 is omitted. For example, the compressor 1 is used by being incorporated in a refrigeration cycle such as an air conditioner, and compresses the refrigerant (CO 2 in this embodiment) introduced from the suction pipe 3 and discharges it from the discharge pipe 4. The compressor 1 will be described below with the vertical direction in FIG.

  The hermetic casing 2 is a cylindrical container with both ends closed, and an upper portion thereof has a discharge pipe 4 for discharging a compressed refrigerant and a coil of a stator 7b (to be described later) of the drive mechanism 6 as a current. Is provided with a terminal terminal 5. In FIG. 1, the wiring connecting the coil and the terminal terminal 5 is not shown. Also. A suction pipe 3 for introducing a refrigerant into the compressor 1 is provided on the side of the closed casing 2. In addition, a lubricating oil L for smoothing the operation of the sliding portion of the compression mechanism 10 is stored in the lower part of the sealed casing 2. Inside the sealed casing 2, a drive mechanism 6 and a compression mechanism 10 are arranged vertically.

  The drive mechanism 6 is provided to drive the compression mechanism 10 and includes a motor 7 serving as a drive source and a shaft 8 attached to the motor 7.

  The motor 7 includes a substantially annular stator 7b fixed to the inner peripheral surface of the hermetic casing 2, and a rotor 7a disposed on the radially inner side of the stator 7b via an air gap. . The rotor 7a has a magnet (not shown), and the stator 7b has a coil. The motor 7 rotates the rotor 7a by an electromagnetic force generated by passing a current through the coil. Further, the outer peripheral surface of the stator 7b is not in close contact with the inner peripheral surface of the hermetic casing 2 over the entire periphery. The outer peripheral surface of the stator 7b extends in the vertical direction and has a space above and below the motor 7. A plurality of recesses (not shown) to be communicated are formed side by side in the circumferential direction.

  The shaft 8 is provided to transmit the driving force of the motor 7 to the compression mechanism 10, is fixed to the inner peripheral surface of the rotor 7a, and rotates integrally with the rotor 7a. The shaft 8 has an eccentric portion 8a at a position in the compression chamber 31 described later. The eccentric portion 8 a is formed in a columnar shape, and its axis is eccentric from the rotation center of the shaft 8. A roller 41 (to be described later) of the compression mechanism 10 is mounted on the eccentric portion 8a.

  An oil supply passage 8b extending in the vertical direction is formed inside the lower half of the shaft 8. A spiral blade-shaped pump member (not shown) for sucking the lubricating oil L into the oil supply passage 8b as the shaft 8 rotates is inserted into the lower end portion of the oil supply passage 8b. Further, the shaft 8 is formed with a plurality of discharge holes 8 c for discharging the lubricating oil L in the oil supply passage 8 b to the outside of the shaft 8.

  The compression mechanism 10 is disposed on the front head (first end plate member) 20 fixed to the inner peripheral surface of the sealed casing 2, the muffler 11 disposed on the upper side of the front head 20, and the lower side of the front head 20. A cylinder 30, a piston 40 disposed inside the cylinder 30, and a rear head (second end plate member) 50 disposed below the cylinder 30. Although details will be described later, as shown in FIG. 2, the cylinder 30 is a substantially annular member, and a compression chamber 31 is formed at the center thereof. The cylinder 30 is fixed to the lower side of the front head 20 together with the rear head 50 by bolts. In FIG. 2, bolt holes formed in the cylinder 30 are omitted.

  As shown in FIGS. 1 and 3, the front head 20 is a substantially annular member, and a bearing hole 21 into which the shaft 8 is rotatably inserted is formed at the center thereof. The outer peripheral surface of the front head 20 is fixed to the inner peripheral surface of the sealed casing 2 by spot welding or the like. The lower surface of the front head 20 closes the upper end of the compression chamber 31 of the cylinder 30. The front head 20 has a discharge hole 22 for discharging the refrigerant compressed in the compression chamber 31. The discharge hole 22 is formed in the vicinity of a blade accommodating portion 33 (described later) of the cylinder 30 when viewed from the up-down direction. Although not shown, a valve mechanism that opens and closes the discharge hole 22 according to the pressure in the compression chamber 31 is attached to the upper surface of the front head 20. In addition, a plurality of oil return holes 23 are formed in the circumferential direction in the radially outer portion of the front head 20 than the cylinder 30.

  The front head 20 is made of a metal material. As shown in FIG. 3, a rough surface portion 24 having a rough surface is formed in a portion of the lower surface of the front head 20 that overlaps with the compression chamber 31 when viewed from above and below. In FIG. 5, the rough surface portion 24 is indicated by a thick line. The arithmetic average surface roughness Ra of the rough surface portion 24 is, for example, 0.3 or more, and preferably about 0.5. In addition, arithmetic mean surface roughness Ra shall comply with JIS B0601: 2001.

  The front head 20 is formed by sintering, casting, or cutting metal powder, and the surface is polished. The minute unevenness of the rough surface portion 24 is formed by chemical conversion treatment, cutting with a dedicated tool, laser irradiation, or the like after the polishing process. Note that, by not performing the polishing process, minute irregularities on the surface formed during sintering, casting, or cutting may be used as the rough surface portion 24.

  The rear head 50 is a substantially annular member, and a bearing hole 51 through which the shaft 8 is rotatably inserted is formed at the center thereof. The rear head 50 closes the lower end of the compression chamber 31 of the cylinder 30. The rear head 50 is formed of a metal material, and the rear head 50 is formed by sintering metal powder, casting, cutting, or the like, and the surface is polished. The arithmetic average surface roughness Ra of the upper surface of the rear head 50 is, for example, less than 0.3.

  The muffler 11 is provided to reduce noise when the refrigerant is discharged from the discharge hole 22 of the front head 20. The muffler 11 is attached to the upper surface of the front head 20 with bolts, and forms a muffler space M between the front head 20 and the muffler 11. Although not shown, the muffler 11 is formed with a muffler discharge hole for discharging the refrigerant in the muffler space M.

  As shown in FIGS. 1 and 2, the cylinder 30 is formed with the above-described compression chamber 31, a suction hole 32 for introducing a refrigerant into the compression chamber 31, and a blade accommodating portion 33. 2A is a cross-sectional view taken along the line AA in FIG. 1, and the discharge holes 22 of the front head 20 are not originally shown, but are shown for convenience of explanation. The cylinder 30 is formed of a metal material, and examples of its manufacturing method include sintering of metal powder, casting, and machining.

  The suction hole 32 is formed so as to extend in the radial direction of the cylinder 30, and the tip of the suction pipe 3 is fitted into the end (the end opposite to the compression chamber 31).

  The blade accommodating portion 33 penetrates the cylinder 30 in the vertical direction and communicates with the compression chamber 31. The blade housing portion 33 extends in the radial direction of the compression chamber 31. The blade accommodating portion 33 is formed at a position between the suction hole 32 and the discharge hole 22 of the front head 20 when viewed from the vertical direction. A pair of bushes 34 is disposed in the blade accommodating portion 33. The pair of bushes 34 is formed in a shape in which a substantially cylindrical member is divided into half. A blade 42 is disposed between the pair of bushes 34. The pair of bushes 34 can swing in the circumferential direction in the blade housing portion 33 with the blade 42 disposed therebetween.

  As shown in FIG. 4, the piston 40 includes an annular roller 41 and a blade 42 extending radially outward from the outer peripheral surface of the roller 41. As shown in FIG. 2, the roller 41 is mounted on the outer peripheral surface of the eccentric portion 8 a so as to be relatively rotatable, and is disposed in the compression chamber 31. Therefore, the upper end surface of the roller 41 faces the rough surface portion 24 of the front head 20. The blade 42 is disposed between the pair of bushes 34 disposed in the blade accommodating portion 33 so as to advance and retreat.

  As shown in FIGS. 2B to 2D, a part of the blade 42 faces the rough surface portion 24 in a state where the blade 42 protrudes from the blade housing portion 33 toward the compression chamber 31. In the state where the blade 42 protrudes from the blade housing portion 33 toward the compression chamber 31, the space formed between the outer peripheral surface of the roller 41 and the peripheral wall surface of the compression chamber 31 is separated from the low-pressure chamber 31 a by the blade 42. It is partitioned into a high pressure chamber 31b.

  FIG. 5A shows the compressor 1 at the time of shipment. 5A, the vertical length H1 of the piston 40 at the time of shipment is slightly smaller than the vertical length H2 of the compression chamber 31, and the difference is, for example, 5 to 15 μm.

  As shown in FIGS. 4 and 5A, the piston 40 of the present embodiment is composed of a base material 43 made of a metal material and thin resin layers 44a and 44b covering the surface of the base material 43. ing. The outer shape of the base material 43 substantially constitutes the outer shape of the piston 40. The base material 43 is manufactured by sintering, casting, or cutting metal powder.

  The resin layers 44a and 44b cover the upper surface and the lower surface of the base material 43, respectively. That is, the resin layers 44a and 44b are formed on the upper end surface and the lower end surface of the piston. Examples of the resin material constituting the resin layers 44a and 44b include polyamideimide, polytetrafluoroethylene, and a mixture thereof. The resin layers 44 a and 44 b have a lower hardness than the upper and lower end surfaces of the piston 40. Further, at the time of shipment of the compressor 1, the resin layers 44a and 44b are hardly swollen (slightly swollen or not swollen at all), and the film thickness of the resin layers 44a and 44b at this time is 10 to 10%. It is about 20 μm. The film thickness is not limited to this thickness. The resin layers 44a and 44b are formed, for example, by performing a process of applying a resin composition solution on the surface of the base material 43 and drying it several times.

  Next, operation | movement of the compressor 1 of this embodiment is demonstrated with reference to Fig.2 (a)-FIG.2 (d). 2A shows a state in which the piston 40 is at the top dead center. FIGS. 2B to 2D show that the shaft 8 is 90 from the state of FIG. It shows a state rotated by 270 ° at 180 ° (bottom dead center).

  When the shaft 8 is rotated by driving the motor 7 while supplying the refrigerant from the suction pipe 3 to the compression chamber 31 through the suction hole 32, as shown in FIGS. 2 (a) to 2 (d), the eccentric portion The roller 41 attached to 8 a moves along the peripheral wall surface of the compression chamber 31. Thereby, the refrigerant is compressed in the compression chamber 31. Hereinafter, the process of compressing the refrigerant will be described in detail.

  When the eccentric portion 8a rotates in the direction of the arrow in the figure from the state of FIG. 2A, a space formed by the outer peripheral surface of the roller 41 and the peripheral wall surface of the compression chamber 31 is formed as shown in FIG. The chamber is divided into a low pressure chamber 31a and a high pressure chamber 31b. When the eccentric portion 8a further rotates, the volume of the low pressure chamber 31a increases as shown in FIGS. 2 (b) to 2 (d). Therefore, the refrigerant enters the low pressure chamber 31a from the suction pipe 3 through the suction hole 32. Is sucked in. At the same time, since the volume of the high pressure chamber 31b is reduced, the refrigerant is compressed in the high pressure chamber 31b.

  Then, when the pressure in the high pressure chamber 31b becomes equal to or higher than a predetermined pressure, the valve mechanism provided in the front head 20 opens, and the refrigerant in the high pressure chamber 31b passes through the discharge hole 22 and the muffler space M Discharged. Thereafter, the state returns to the state of FIG. 2A, and the discharge of the refrigerant from the high pressure chamber 31b is completed. By repeating this process, the refrigerant supplied from the suction pipe 3 to the compression chamber 31 is continuously compressed and discharged.

  The refrigerant discharged into the muffler space M is discharged out of the compression mechanism 10 through a muffler discharge hole (not shown) of the muffler 11. The refrigerant discharged from the compression mechanism 10 passes through an air gap between the stator 7b and the rotor 7a, and is finally discharged out of the sealed casing 2 from the discharge pipe 4.

  At this time, a part of the lubricating oil L supplied into the compression chamber 31 from the discharge hole 8c of the shaft 8 is discharged into the muffler space M from the discharge hole 22 together with the refrigerant, and then the muffler discharge hole (not shown) of the muffler 11. ) To the outside of the compression mechanism 10. A part of the lubricating oil L discharged to the outside of the compression mechanism 10 is returned to the storage portion at the lower part of the sealed casing 2 through the oil return hole 23 of the front head 20. Further, another part of the lubricating oil L discharged to the outside of the compression mechanism 10 is formed on the outer peripheral surface of the stator 7b after passing through the air gap between the stator 7b and the rotor 7a together with the refrigerant. Between the recessed portion (not shown) and the inner peripheral surface of the sealed casing 2, and through the oil return hole 23 of the front head 20, is returned to the storage section at the lower portion of the sealed casing 2.

  As described above, the vertical length of the piston 40 is set slightly smaller than the vertical length of the compression chamber 31. Therefore, during normal operation of the compressor 1, as shown in FIG. 5A, a minute gap between the upper end surface of the piston 40 and the front head 20 and between the lower end surface of the piston 40 and the rear head 50. Lubricating oil L discharged from the discharge hole 8c of the shaft 8 exists in D1 and D2 (hereinafter, these gaps are referred to as axial gaps D1 and D2).

  However, when the compressor 1 is started at high speed, or when the temperature difference between the discharged refrigerant and the sucked refrigerant is large, the amount of thermal expansion of the piston 40 is the thermal expansion of the cylinder 30. Larger than the amount. Therefore, the axial gaps D <b> 1 and D <b> 2 are lost, and the upper and lower end surfaces of the piston 40 may come into contact with the front head 20 and the rear head 50.

  Further, when the compressor 1 is continuously used, the resin layers 44a and 44b swell by absorbing the lubricating oil L and the refrigerant as shown in FIG. Thereby, even if it is not the special driving | running | working situation as mentioned above, axial direction clearances D1 and D2 may be lost.

  When the axial gaps D1 and D2 are eliminated as described above, seizure can be prevented from occurring due to the slidability of the resin layers 44a and 44b.

  Furthermore, in the present embodiment, the resin layer 44 a provided on the upper end surface of the piston 40 faces the rough surface portion 24 of the front head 20. Since the rough surface portion 24 is harder than the resin layer 44a and has a rough surface roughness, when the rough surface portion 24 and the resin layer 44b slide in contact with each other, the minute protrusions formed on the rough surface portion 24 are formed. By the portion, the surface of the resin layer 44a is shaved until the surface pressure is almost inoperative. Thereby, since the surface pressure between contact surfaces reduces, a friction loss can be reduced and the fall of the efficiency of the compressor 1 can be suppressed. Note that the resin layer 44a does not necessarily have to be cut to a state where the surface pressure does not substantially act. The effect of reducing the friction loss can be obtained even if the surface pressure is reduced to such an extent that the surface pressure is reduced.

Moreover, the compressor 1 of this embodiment is arrange | positioned in the direction from which the axial direction of the compression chamber 31 becomes a perpendicular direction. Therefore, due to the gravity of the piston 40, the lower end surface of the piston 40 and the upper surface of the rear head 50 are relatively easily in contact with each other, and the surface roughness of the surfaces of the front head 20 and the rear head facing the upper and lower end surfaces of the piston 40 is the same. The resin layer 44b on the lower end surface of the piston 40 is more easily scraped than the resin layer 44a on the upper end surface of the piston 40. In this embodiment, since the surface roughness of the lower surface of the front head 20 is made larger than the surface roughness of the upper surface of the rear head 50, the resin layer 44b on the lower end surface of the piston 40 is replaced with the resin layer on the upper end surface of the piston 40. It is possible to prevent the material from being excessively shaved than 44a.
Further, the upper surface of the rear head 50 has an arithmetic average surface roughness Ra of less than 0.3 and is substantially flat, so that it is possible to reliably prevent the resin layer 44b on the lower end surface of the piston 40 from being excessively shaved. .

Second Embodiment
Next, a second embodiment of the present invention will be described.
The present embodiment is an example in which the present invention is applied to a two-cylinder rotary compressor.
As shown in FIG. 6, the compressor 101 of this embodiment differs in the structure of the shaft 108 and the compression mechanism 110 from the said 1st Embodiment. Further, in the compressor 101 of the present embodiment, the two suction pipes 3 are provided side by side on the side of the sealed casing 2. Since other configurations are the same as those of the first embodiment, the same reference numerals are used and the description thereof is omitted as appropriate.

  The shaft 108 has two eccentric portions 108a and 108d. The shaft centers of the two eccentric portions 108a and 108d are shifted by 180 ° about the rotation axis of the shaft 108. Moreover, the shaft 108 has the oil supply path 108b and the some discharge hole 108c similarly to the shaft 8 of the said 1st Embodiment.

  The compression mechanism 110 includes a front muffler 111, a front head 120, a cylinder 130 and a piston 140, a middle plate 150, a cylinder 160 and a piston 170 in order from the top to the bottom along the axial direction of the shaft 108. A rear head 180 and a rear muffler 112 are provided. The front head 120 and the middle plate 150 are arranged at the upper and lower ends of the piston 140 and correspond to the first end plate member and the second end plate member of the present invention. The middle plate 150 and the rear head 180 are disposed at the upper and lower ends of the piston 170 and correspond to the first end plate member and the second end plate member of the present invention.

  The front muffler 111 has the same configuration as the muffler 11 of the first embodiment, and forms a muffler space M1 between the front muffler 111 and the front head 120.

  The front head 120 is formed with a bearing hole 121, a discharge hole 122 (see FIG. 7), and an oil return hole 123. Further, the front head 120 has a through hole (not shown) penetrating in the vertical direction. The through hole constitutes a part of a flow path for discharging the refrigerant in the muffler space M2 formed by the rear head 180 and the rear muffler 112 to the muffler space M1. The front head 120 has the same configuration as the front head 20 of the first embodiment, except that the front head 120 has the through hole. As shown in FIG. 8, a portion of the lower surface of the front head 120 that overlaps with the compression chamber 131 of the cylinder 130 when viewed from above and below has a rough surface portion having the same surface roughness as the rough surface portion 24 of the first embodiment. 124 is formed.

  As shown in FIG. 7, the cylinder 130 is formed with a compression chamber 131, a suction hole 132, and a blade accommodating portion 133. Further, a through hole 135 for discharging a refrigerant in the muffler space M2 described later to the muffler space M1 is formed in the outer peripheral side portion of the compression chamber 131 in the cylinder 130. The cylinder 130 has the same configuration as the cylinder 30 of the first embodiment except that the cylinder 130 has the through hole 135.

  The piston 140 has the same configuration as the piston 40 of the first embodiment, and includes a roller 41 and a blade 42. The roller 41 is rotatably mounted on the outer peripheral surface of the eccentric portion 108 a, and the blade 42 is disposed between the pair of bushes 34 disposed in the blade accommodating portion 133 of the cylinder 130 so as to advance and retreat. As shown in FIG. 8, the piston 140 includes a base material 43 made of a metal material, and thin resin layers 44 a and 44 b covering the surface of the base material 43, as in the piston 40 of the first embodiment. It is composed of

  The middle plate 150 is an annular plate member that is disposed between the cylinder 130 and the cylinder 160 and closes the lower end of the compression chamber 131 of the cylinder 130 and closes the upper end of the compression chamber 161 of the cylinder 160. ing. Further, the middle plate 150 is formed with a through hole (not shown) for discharging a refrigerant in the muffler space M2 described later to the muffler space M1.

  The middle plate 150 is made of a metal material. As shown in FIG. 8, a portion of the lower surface of the middle plate 150 that overlaps with the compression chamber 161 of the cylinder 160 when viewed in the vertical direction has a rough surface portion having the same surface roughness as the rough surface portion 24 of the first embodiment. 151 is formed. The manufacturing method of the middle plate 150 is the same as the manufacturing method of the front head 20 described in the first embodiment.

  The cylinder 160 has the same configuration as the cylinder 130 described above, and includes a compression chamber 161, a suction hole 162, a blade accommodating portion (not shown) in which a pair of bushes 34 are arranged, and a through hole (not shown). Have

  The piston 170 has the same configuration as the piston 40 of the first embodiment, and includes a roller 41 and a blade 42. The roller 41 is rotatably mounted on the outer peripheral surface of the eccentric portion 108d, and the blade 42 is disposed between a pair of bushes 34 disposed in a blade accommodating portion (not shown) of the cylinder 160 so as to be able to advance and retreat. Yes. The piston 170 includes a base material 43 made of a metal material and thin resin layers 44 a and 44 b that cover the surface of the base material 43, as in the piston 40 of the first embodiment.

  The rear head 180 is disposed below the cylinder 160 and closes the lower end of the compression chamber 131 of the cylinder 160. The rear head 180 is a substantially annular member, and a bearing hole 181 through which the shaft 108 is rotatably inserted is formed at the center thereof. Further, the rear head 180 is formed with a discharge hole (not shown) for discharging the refrigerant compressed in the compression chamber 161 of the cylinder 160 to the muffler space M2 formed between the rear head 180 and the rear muffler 112. Yes. Further, the rear head 180 is formed with a through hole (not shown) for discharging the refrigerant in the muffler space M2 to the muffler space M1. A valve mechanism (not shown) that opens and closes the discharge hole according to the pressure in the compression chamber 161 is attached to the lower surface of the rear head 180. The rear head 180 is made of a metal material. The rear head 180 is formed by sintering metal powder, casting, cutting, or the like, and the surface is polished. The arithmetic average surface roughness Ra of the upper surface of the rear head 180 is, for example, less than 0.3.

  The rear muffler 112 is provided to reduce noise when the refrigerant is discharged from the discharge hole (not shown) of the rear head 180. The rear muffler 112 is attached to the lower surface of the rear head 180 with bolts, and forms a muffler space M2 between the rear muffler 112 and the rear head 180. The muffler space M2 communicates with the muffler space M1 through through holes formed in the rear head 180, the cylinder 160, the middle plate 150, the cylinder 130, and the front head 120, respectively.

The operation of the compressor 101 of this embodiment will be described.
When the shaft 108 is rotated by driving the motor 7 while supplying the refrigerant from the suction holes 132 and 162 to the compression chambers 131 and 161, the roller 41 of the piston 140 attached to the eccentric portion 108 a Move along. Thereby, the refrigerant is compressed in the compression chamber 131. In parallel with this, the roller 41 of the piston 170 attached to the eccentric portion 108 d moves along the peripheral wall surface of the compression chamber 161. As a result, the refrigerant is compressed in the compression chamber 161.

When the pressure in the compression chamber 131 becomes equal to or higher than a predetermined pressure, the valve mechanism provided in the front head 120 is opened, and the refrigerant in the compression chamber 131 flows from the discharge hole 22 of the front head 120 through the muffler space M1. Discharged.
Further, when the pressure in the compression chamber 161 becomes equal to or higher than a predetermined pressure, the valve mechanism provided in the rear head 180 is opened, and the refrigerant in the compression chamber 161 is discharged from a discharge hole (not shown) of the rear head 180. It is discharged into the muffler space M2. The refrigerant discharged to the muffler space M2 is discharged to the muffler space M1 through through holes formed in the rear head 180, the cylinder 160, the middle plate 150, the cylinder 130, and the front head 120, respectively.

  The refrigerant discharged into the muffler space M1 is discharged out of the compression mechanism 110 through a muffler discharge hole (not shown) of the front muffler 111, and then passes through an air gap between the stator 7b and the rotor 7a. Thereafter, it is finally discharged from the discharge pipe 4 to the outside of the sealed casing 2.

  In the present embodiment, as in the first embodiment, resin layers 44a and 44b are provided on the upper and lower end surfaces of the pistons 140 and 170, and the portions of the upper end surfaces of the pistons 140 and 170 facing the resin layer 44a are roughened. Since the surface portions 124 and 151 are formed, the same effect as the first embodiment can be obtained.

<Third Embodiment>
Next, a third embodiment of the present invention will be described.
The compressor of the present embodiment is different from the first embodiment in the configuration of the compression mechanism 210. Since other configurations are the same as those of the first embodiment, the same reference numerals are used and the description thereof is omitted as appropriate.

  As shown in FIG. 9, the compression mechanism 210 differs in the structure of the member arrange | positioned inside the cylinder 230 and the cylinder 230, and the other structure is the same as that of the said 1st Embodiment.

  The cylinder 230 has a compression chamber 231 and a suction hole 232. Further, the cylinder 230 has a vane accommodating portion 233 instead of the blade accommodating portion 33 of the first embodiment, and other configurations are the same as those of the cylinder 30 of the first embodiment. The vane accommodating portion 233 passes through the cylinder 230 in the vertical direction and communicates with the compression chamber 231. Further, the vane accommodating portion 233 extends in the radial direction of the compression chamber 231.

  An annular roller 241 is disposed inside the compression chamber 231. The roller 241 is disposed in the compression chamber 231 in a state in which the roller 241 is mounted on the outer peripheral surface of the eccentric portion 8a so as to be relatively rotatable. Therefore, the upper end surface of the roller 241 faces the rough surface portion 24 of the front head 20. Further, the vertical length of the roller 241 is the same as the vertical length H1 of the piston 40 of the first embodiment. Further, the outer diameter of the roller 241 is the same as the outer diameter of the roller 41 of the piston 40 of the first embodiment.

  A vane 244 is disposed inside the vane housing portion 233. As shown in FIG. 10, the vane 244 is a flat plate-like member, and the vertical length thereof is the same as the vertical length of the roller 241. The tip of the vane 244 on the center side of the compression chamber 231 (lower tip in FIG. 9) is formed in a tapered shape as viewed from above. Further, the vane 244 is urged by an urging spring 247 provided in the vane housing portion 233, and the distal end portion on the compression chamber 231 side is pressed against the outer peripheral surface of the roller 241. Therefore, as shown in FIGS. 9A to 9D, when the roller 241 moves along the peripheral wall surface of the compression chamber 231 as the shaft 8 rotates, the vane 244 is moved in the vane accommodating portion 233. Then, it moves forward and backward along the radial direction of the compression chamber 231. As shown in FIG. 9B to FIG. 9D, in a state where the vane 244 protrudes from the vane housing portion 233 to the compression chamber 231 side, the outer peripheral surface of the roller 241 and the peripheral wall surface of the compression chamber 231 The space formed therebetween is divided into a low pressure chamber 231a and a high pressure chamber 231b by a vane 244. Further, a part of the vane 244 faces the rough surface portion 24 in a state where the vane 244 protrudes from the vane accommodating portion 233 to the compression chamber 231 side.

  As shown in FIGS. 10 and 11, the roller 241 includes a base material 242 made of a metal material and thin resin layers 243 a and 243 b that cover the surface of the base material 242. The vane 244 includes a base material 245 made of a metal material and thin film resin layers 246 a and 246 b that cover the surface of the base material 245.

  As shown in FIG. 11, the outer shapes of the base materials 242 and 245 substantially constitute the outer shapes of the roller 241 and the vane 244, respectively. The base materials 242 and 245 are manufactured by sintering, casting, or cutting metal powder.

The resin layers 243a and 243b of the roller 241 cover the upper surface and the lower surface of the base material 242, respectively. That is, the resin layers 243 a and 243 b are formed on the upper end surface and the lower end surface of the roller 241. The resin layers 246a and 246b of the vane 244 are formed on the upper surface and the lower surface of the base material 245, respectively. That is, the resin layers 246 a and 246 b are formed on the upper end surface and the lower end surface of the vane 244.
The material and film thickness of the resin layers 243a, 243b, 246a, 246b are the same as those of the resin layers 44a, 44b of the piston 40 of the first embodiment.

Next, the operation of the compressor of this embodiment will be described.
FIG. 9A shows a state where the roller 241 is at the top dead center, and FIGS. 9B to 9D show that the shaft 8 is 90 from the state of FIG. It shows a state rotated by 270 ° at 180 ° (bottom dead center).

  When the shaft 8 is rotated by driving the motor 7 while supplying the refrigerant from the suction pipe 3 to the compression chamber 231 through the suction hole 232, as shown in FIGS. 9A to 9D, the eccentric portion The roller 241 attached to 8 a moves along the peripheral wall surface of the compression chamber 231. Thereby, the refrigerant is compressed in the compression chamber 231. Hereinafter, the process of compressing the refrigerant will be described in detail.

  When the eccentric portion 8a rotates in the direction of the arrow in the drawing from the state of FIG. 9A, a space formed by the outer peripheral surface of the roller 241 and the peripheral wall surface of the compression chamber 231 is formed as shown in FIG. 9B. The chamber is divided into a low pressure chamber 231a and a high pressure chamber 231b. When the eccentric portion 8a further rotates, the volume of the low-pressure chamber 231a increases as shown in FIGS. 9B to 9D, so that the refrigerant enters the low-pressure chamber 231a from the suction pipe 3 through the suction hole 232. Is sucked in. At the same time, since the volume of the high pressure chamber 231b is reduced, the refrigerant is compressed in the high pressure chamber 231b.

  When the pressure in the high-pressure chamber 231b becomes equal to or higher than a predetermined pressure, the valve mechanism provided in the front head 20 is opened, and the refrigerant in the high-pressure chamber 231b passes through the discharge hole 22 to the muffler space M. Discharged. The refrigerant discharged into the muffler space M passes through the same path as the compressor 1 of the first embodiment, and is finally discharged out of the sealed casing 2 from the discharge pipe 4.

In the present embodiment, since the resin layers 243a, 243b, 246a, and 246b are provided on the upper and lower end surfaces of the roller 241 and the upper and lower end surfaces of the vane 244, the axial clearance is eliminated as in the first embodiment. Occurrence of seizure can be prevented.
Further, since the rough surface portion 24 is formed in a portion facing the resin layer 243a on the upper end surface of the roller 241 and the resin layer 246a on the upper end surface of the vane 244, the resin layers 243a and 246a and the rough surface portion 24 are formed. When the resin layers 243a and 246a are scraped when they come into contact with each other, the friction loss can be reduced as in the first embodiment.

  As mentioned above, although embodiment of this invention was described, it should be thought that the specific structure of this invention is not limited to the said 1st-3rd embodiment. The scope of the present invention is shown not only by the description of the above-described embodiment but also by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope. Note that the following modifications can be implemented in combination as appropriate.

In the first and second embodiments, the resin layer 44a is provided on the entire upper end surface of the piston 40, 140, 170, but may be provided only on a part of the upper end surface of the piston.
For example, like the piston 340 shown in FIG. 12, the resin layer 344 a is formed in the upper end surface of the blade 342 and the substantially half of the upper end surface of the roller 341 on the suction hole 32 side from the blade 342 (substantially right half in FIG. 12). And the resin layer may not be provided on the remaining portion of the upper end surface of the piston 340. According to this configuration, although the range in which seizure can be prevented is narrowed, the axial gap on the low pressure chamber 31a side can be made as small as possible by the resin layer 344a. Therefore, the high temperature lubricating oil L is discharged from the outer peripheral portion of the shaft 8 to the low pressure chamber 31a. It can suppress flowing in. Therefore, it can suppress that the refrigerant | coolant in the low pressure chamber 31a is overheated, and compression efficiency falls.
Similarly, the resin layers 44b of the first and second embodiments and the resin layers 243a, 243b, 246a, and 246b of the third embodiment may be provided not only on the entire surfaces but also on only a part thereof.

  The resin layer 44b on the lower end surface of the pistons 40, 140, and 170 of the first and second embodiments is not necessarily provided. Further, the resin layer 243b on the lower end surface of the roller 241 and the resin layer 246b on the lower end surface of the vane 244 of the third embodiment are not necessarily provided.

In the first to third embodiments, the rough surface portions 24 and 124 are formed on the entire lower surface of the front heads 20 and 120 and overlapping with the compression chambers 31, 131 and 231 when viewed from above and below. The rough surface portion may be formed only in a part of the portion overlapping the compression chamber.
For example, as shown in FIG. 13, a rough surface portion 424 is formed in a substantially half region on the high pressure chamber 31 b side (right side in FIG. 13) of the lower surface of the front head 420 that overlaps with the compression chamber 31 when viewed from above and below. It may be formed. Since almost half of the piston 40 on the high-pressure chamber 31b side (right side in FIG. 13) is heated by the high-temperature and high-pressure refrigerant in the high-pressure chamber 31b, the amount of thermal expansion is that of the piston 40 on the low-pressure chamber 31a side. It becomes larger than about half. Therefore, the substantially half portion on the right side in FIG. 13 of the upper end surface of the piston 40 tends to come into contact with the lower surface of the front head 420. In this modified form, the rough surface portion 424 is formed only in the portion of the lower surface of the front head 420 that is easily in contact with the resin layer 44a on the upper end surface of the piston. The surface pressure in between can be efficiently reduced.
The same applies to the rough surface portion 151 on the lower surface of the middle plate 150 of the third embodiment.

In the first to third embodiments, the rough surface portions 24 and 124 are formed only on the lower surfaces of the front heads 20 and 120, which are overlapped with the compression chambers 31, 131, and 231 when viewed in the vertical direction. The surface roughness of the entire lower surface of the front heads 20 and 120 may be increased.
The same applies to the lower surface of the middle plate 150 of the third embodiment.

In the first embodiment, the resin layer 44a is provided on the upper end surface of the piston 40, and the surface roughness of the lower surface of the front head 20 facing the resin layer 44a is rough. Instead of providing the resin layer on the end surface, the surface roughness may be increased and the resin layer may be provided on the lower surface of the front head 20. The resin layer on the lower surface of the front head 20 may be provided on the entire lower surface, or may be provided only on a portion thereof (for example, a portion overlapping with the compression chamber 31 when viewed from the vertical direction).
The upper end surface of the piston 140 and the lower surface of the front head 120 according to the second embodiment, the upper end surface of the piston 170 and the lower surface of the middle plate 150, and the upper end surfaces of the rollers 241 and vanes 244 and the lower surface of the front head 20 according to the third embodiment. Similarly, the resin layer and the rough surface portion may be reversed.

Instead of providing the resin layer 44b on the lower end surface of the piston 40 of the first embodiment, a resin layer may be provided on the upper surface of the rear head 50. Further, a resin layer may be provided on both the lower end surface of the piston 40 and the upper surface of the rear head 50. The resin layer on the upper surface of the rear head 50 may be provided on the entire upper surface, or may be provided only on a portion thereof (for example, a portion overlapping with the compression chamber 31 when viewed from the vertical direction).
The lower end surface of the piston 140 and the upper surface of the middle plate 150 in the second embodiment, the lower end surface of the piston 170 and the upper surface of the rear head 180, and the lower end surfaces of the rollers 241 and vanes 244 and the lower surface of the rear head 50 in the third embodiment also. Similarly, the resin layer may be provided on the opposite surface, or the resin layer may be provided on both.

In the first embodiment, the surface facing the upper end surface (resin layer 44a) of the piston 40 is rough, and the surface facing the lower end surface (resin layer 44b) of the piston 40 is substantially flat. On the contrary, the surface facing the upper end surface of the piston 40 may be substantially flat, and the surface roughness of the surface facing the lower end surface of the piston 40 may be rough. That is, the lower surface of the front head 20 may be substantially flat, and the entire surface or a part of the upper surface of the rear head 50 (for example, a portion overlapping the compression chamber 31 when viewed from the up-down direction) may be rough.
However, when the compressor 1 is arranged so that the axial direction of the shaft 8 is the vertical direction (or the direction other than the vertical direction and inclined with respect to the horizontal direction) as in the first embodiment, the piston 40 Since the lower end surface of the piston 40 and the upper surface of the rear head 50 are likely to come into contact with each other due to gravity, the resin layer 44b may be scraped too much depending on the surface roughness of the upper surface of the rear head 50. In this respect, it is preferable that the surface roughness of the lower surface of the front head 20 is increased to make the upper surface of the rear head 50 substantially flat as in the first embodiment.
Similarly, the lower surface of the front head 120 and the upper surface of the middle plate 150 of the second embodiment, the lower surface of the middle plate 150 and the upper surface of the rear head 180, and the front head 20 and the rear head 50 of the third embodiment also have surface roughness. The rougher may be reversed.

In the first embodiment, the surface facing the upper end surface (resin layer 44a) of the piston 40 is rough, and the surface facing the lower end surface (resin layer 44b) of the piston 40 is substantially flat. However, the surface roughness of both the surface facing the upper end surface (resin layer 44a) of the piston 40 and the surface facing the lower end surface (resin layer 44b) of the piston 40 may be rough. That is, the entire surface of the lower surface of the front head 20 and the upper surface of the rear head 50 or a part thereof (for example, the portion overlapping the compression chamber 31 when viewed in the vertical direction in FIG. 1) may be rough. In this case, the surface roughness of the lower surface of the front head 20 and the upper surface of the rear head 50 may be the same or different. In order to prevent the resin layer 44b from being scraped too much, it is preferable that the surface roughness of the upper surface of the rear head 50 is not rougher than the lower surface of the front head 20. Yes.
Similarly, the lower surface of the front head 120 and the upper surface of the middle plate 150, the lower surface of the middle plate 150 and the upper surface of the rear head 180, and the front head 20 and the rear head 50 of the third embodiment are both rough. May be rough.

In the said 1st Embodiment, although the compressor 1 is arrange | positioned so that the axial direction of the shaft 8 may become a perpendicular direction, it is arrange | positioned so that the axial direction of the shaft 8 may become diagonal with respect to a perpendicular direction. Alternatively, the shaft 8 may be arranged so that the axial direction thereof is the horizontal direction. In the latter case, since the gravity of the piston 40 acts in the radial direction of the piston, the resin layers 44a and 44b are scraped substantially the same regardless of whether the rough surface portion is formed on either the front head 20 or the rear head 50. Therefore, the rough surface portion may be formed on either the front head 20 or the rear head 50, or may be formed on both.
The same applies to the compressors of the second and third embodiments.

  In the first to third embodiments, the compression mechanism is supported by the outer peripheral portion of the front heads 20 and 120 being fixed to the inner peripheral surface of the sealed casing 2, but the cylinders 30, 130, 160, middle The structure supported by fixing the outer peripheral part of the plate 150 or the rear heads 50 and 180 to the inner peripheral surface of the airtight casing 2 may be sufficient.

  In the third embodiment, the compression mechanism including the roller 241 and the vane 244 is applied to a one-cylinder rotary compressor. However, the compression mechanism may be applied to a two-cylinder rotary compressor.

  By utilizing the present invention, when the surface of the resin layer slides in contact with the opposing member, friction loss due to sliding can be reduced.

1, 101 Compressor 20, 120 Front head (first end plate member)
30, 130, 160 Cylinder 31, 131, 161 Compression chamber 33, 133 Blade housing part 34 Pair of bushes 40, 140, 170 Piston 41 Roller 42 Blade 43 Base material 44a, 44b Resin layer 50, 180 Rear head (second end plate) Element)
150 middle plate (first end plate member, second end plate member)
230 Cylinder 231 Compression chamber 233 Vane accommodating portion 241 Roller 242 Base material 243a, 243b Resin layer 244 Vane 245 Base material 246a, 246b Resin layer

Claims (8)

A cylinder having a compression chamber and a blade accommodating portion communicating with the compression chamber;
A first end plate member and a second end plate member disposed at upper and lower ends of the cylinder;
A piston disposed inside the compression chamber and the blade accommodating portion;
The piston has an annular roller disposed in the compression chamber, and a blade that extends from the outer peripheral surface of the roller and is disposed so as to be able to advance and retreat with respect to the blade accommodating portion.
A resin layer is formed on the entire surface of the upper end surface and the lower end surface of the piston,
The surface of the first end plate member that faces the upper end surface of the piston and the surface of the second end plate member that faces the lower end surface of the piston have higher hardness than the resin layer,
The arithmetic average surface roughness Ra of the surface of the first end plate member facing the upper end surface of the piston is 0.3 or more, and the surface of the second end plate member is opposed to the lower end surface of the piston. A compressor characterized by being larger than the arithmetic average surface roughness Ra. 2. The compressor according to claim 1 , wherein an arithmetic average surface roughness Ra of a surface of the second end plate member facing the lower end surface of the piston is less than 0.3. A cylinder having a compression chamber and a blade accommodating portion communicating with the compression chamber;
A first end plate member and a second end plate member disposed at upper and lower ends of the cylinder;
A piston disposed inside the compression chamber and the blade accommodating portion;
The piston has an annular roller disposed in the compression chamber, and a blade that extends from the outer peripheral surface of the roller and is disposed so as to be able to advance and retreat with respect to the blade accommodating portion.
A resin layer is formed on the entire surface of the surface of the first end plate member facing the upper end surface of the piston and the surface of the second end plate member facing the lower end surface of the piston,
The upper end surface of the piston and the lower end surface of the piston have higher hardness than the resin layer,
The compressor characterized in that the arithmetic average surface roughness Ra of the upper end face of the piston is 0.3 or more and is larger than the arithmetic average surface roughness Ra of the lower end face of the piston. The compressor according to claim 3 , wherein an arithmetic average surface roughness Ra of the lower end face of the piston is less than 0.3. A cylinder having a compression chamber and a blade accommodating portion communicating with the compression chamber;
A first end plate member and a second end plate member disposed at upper and lower ends of the cylinder;
An annular roller disposed inside the compression chamber;
A vane having a tip pressed against the outer peripheral surface of the roller and arranged to be able to advance and retreat inside the vane housing portion;
A resin layer is formed on the entire surface of the upper end surface and the lower end surface of the roller, respectively.
The surface of the first end plate member that faces the upper end surface of the roller and the surface of the second end plate member that faces the lower end surface of the roller have higher hardness than the resin layer,
The arithmetic average surface roughness Ra of the surface of the first end plate member facing the upper end surface of the roller is 0.3 or more, and the surface of the second end plate member facing the lower end surface of the roller A compressor characterized by being larger than the arithmetic average surface roughness Ra. The compressor according to claim 5 , wherein an arithmetic average surface roughness Ra of a surface of the second end plate member facing the lower end surface of the roller is less than 0.3. A cylinder having a compression chamber and a blade accommodating portion communicating with the compression chamber;
A first end plate member and a second end plate member disposed at upper and lower ends of the cylinder;
An annular roller disposed inside the compression chamber;
A vane having a tip pressed against the outer peripheral surface of the roller and arranged to be able to advance and retreat inside the vane housing portion;
Resin layers are formed on the entire surface of the surface of the first end plate member that faces the upper end surface of the roller and the portion of the second end plate member that faces the lower end surface of the roller. And
The upper end surface of the roller and the lower end surface of the roller have higher hardness than the resin layer,
An arithmetic average surface roughness Ra of the upper end face of the roller is 0.3 or more, and is larger than an arithmetic average surface roughness Ra of the lower end face of the roller. The compressor according to claim 7 , wherein an arithmetic average surface roughness Ra of the lower end surface of the roller is less than 0.3.

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