JP2012137009A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce frictional loss due to sliding, in a compressor for compressing a cooling medium.SOLUTION: The compressor includes: a cylinder 30 having a compression chamber 31 and a blade housing part in communication with the compression chamber 31; front and rear heads 20 and 50 disposed at axial both ends of the cylinder 30; and a piston 40 disposed inside the compression chamber 31 and the blade housing part. The piston 40 includes: an annular roller 41 disposed at the compression chamber 31; and a blade 42 extending from the outer circumferential surface of the roller 41 and reciprocally arranged relative to the blade housing part. Resin layers 46, 47 including thick parts 46a, 47a are formed on axial end faces of the piston 40, and a resin layer 48 including a thick part 48a is formed on the outer circumferential surface of the roller 41. The thick part 48a of the resin layer 48 extends along a circumferential direction of the roller 41.

Description

  The present invention relates to a compressor for compressing 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, there are minute gaps between the end surface of the roller and the end plate member disposed to face the end surface, and between the outer peripheral surface of the roller and the inner peripheral surface of the cylinder. Is formed. The size of the gap is preferably as small as possible from the viewpoint of preventing leakage of refrigerant and lubricating oil. Even if the gap as described above is provided, for example, when the amount of thermal expansion of the roller is larger than the amount of thermal expansion of the cylinder, the gap may disappear and the roller may contact the opposing member. is there. In such a case, there are two problems, namely seizure due to sliding and reduced efficiency of the compressor due to friction loss.

  For example, Patent Document 1 proposes to improve the slidability by resin coating in order to solve the seizure problem among the above two problems. Thereby, it is possible to prevent seizure without increasing the size of the gap.

JP 2006-275280 A

  However, in the compressor of Patent Document 1, the problem of the efficiency reduction of the compressor due to friction loss has not been solved. In addition, since the resin coating layer swells by absorbing the refrigerant and the lubricating oil, the above-mentioned gap is likely to be eliminated. Therefore, there is a great need to eliminate the problem of the compressor efficiency reduction due to friction loss.

  Therefore, the present invention has been made to solve the above-described problems, and an object thereof is to provide a compressor capable of reducing friction loss due to sliding.

  A compressor according to a first aspect of the present invention includes a compression chamber and a cylinder having a blade accommodating portion communicating with the compression chamber, a first end plate member and a second end plate member disposed at both axial ends of the cylinder, A piston disposed inside the compression chamber and the blade housing portion, the piston extending from an outer peripheral surface of the roller and in the blade housing portion, the annular roller disposed in the compression chamber A resin layer having a portion having a different thickness is formed on the entire surface or a part of the axial end surface of the piston.

  In this compressor, when the resin layer swells, only the thick part of the resin layer comes into contact with the end plate member. Accordingly, friction loss due to sliding can be reduced as compared with the case where the entire resin layer is in contact with the end plate member.

  A compressor according to a second aspect of the present invention is the compressor according to the first aspect, wherein the resin layer is formed on the entire axial end surface of the piston.

  In this compressor, the sealing performance of the gap between the axial end surface of the piston and the end plate member can be improved. Therefore, it is possible to prevent the refrigerant and the lubricating oil from leaking from the gap between the axial end surface of the piston and the end plate member, thereby reducing the refrigerant compression efficiency.

  A compressor according to a third aspect is the compressor according to the first or second aspect, wherein the thick portion of the resin layer is formed over the entire circumference of the roller.

  In this compressor, the sealing performance of the clearance between the axial end surface of the piston and the end plate member can be further improved.

  According to a fourth aspect of the present invention, there is provided a compressor having a compression chamber and a cylinder having a blade accommodating portion communicating with the compression chamber, a first end plate member and a second end plate member disposed at both axial ends of the cylinder, A piston disposed inside the compression chamber and the blade housing portion, the piston extending from an outer peripheral surface of the roller and in the blade housing portion, the annular roller disposed in the compression chamber A blade disposed so as to be capable of advancing and retreating, and the entire outer surface or part of the outer peripheral surface of the roller or the peripheral wall surface of the compression chamber has a thickness in the axial direction of the roller. Resin layers having different portions are formed.

  In this compressor, when the resin layer swells, only the thick part of the resin layer contacts the outer peripheral surface of the roller or the peripheral wall surface of the compression chamber. Therefore, friction loss due to sliding can be reduced as compared with the case where the entire resin layer is in contact with the outer peripheral surface of the roller or the peripheral wall surface of the compression chamber.

  A compressor according to a fifth invention is the compressor according to the fourth invention, wherein a thick portion in the resin layer has a smallest gap between the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber. It is formed so as to include a portion.

  In this compressor, it is possible to reliably reduce friction loss due to sliding by providing a thick portion of the resin layer at a place where the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber are most likely to contact each other. .

  A compressor according to a sixth aspect of the invention includes a compression chamber and a cylinder having a vane accommodating portion communicating with the compression chamber, a first end plate member and a second end plate member disposed at both axial 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. A resin layer having portions having different thicknesses is formed on the entire surface or a part of at least one of the portions serving as the direction end surface and the axial end surface of the vane.

  In this compressor, when the resin layer swells, only the thick part of the resin layer comes into contact with the end plate member. Accordingly, friction loss due to sliding can be reduced as compared with the case where the entire resin layer is in contact with the end plate member.

  A compressor according to a seventh aspect is the compressor according to the sixth aspect, wherein the resin layer is formed on the entire axial end surface of the roller.

  In this compressor, the sealing performance of the gap between the axial end surface of the roller and the end plate member can be improved. Therefore, it is possible to prevent the refrigerant or the lubricating oil from leaking from the gap between the axial end face of the roller and the end plate member, thereby reducing the refrigerant compression efficiency.

  A compressor according to an eighth invention is the compressor according to the sixth or seventh invention, wherein the thick portion of the resin layer is formed over the entire circumference of the roller.

  In this compressor, the sealing performance of the gap between the axial end surface of the roller and the end plate member can be further improved.

  According to a ninth aspect of the present invention, there is provided a compressor having a compression chamber and a cylinder having a vane accommodating portion communicating with the compression chamber, a first end plate member and a second end plate member disposed at both axial 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. A resin layer having portions having different thicknesses in the axial direction of the roller is formed on the entire surface or a part of any one of the surface and the peripheral wall surface of the compression chamber.

  In this compressor, when the resin layer swells, only the thick part of the resin layer contacts the outer peripheral surface of the roller or the peripheral wall surface of the compression chamber. Therefore, friction loss due to sliding can be reduced as compared with the case where the entire resin layer is in contact with the outer peripheral surface of the roller or the peripheral wall surface of the compression chamber.

  A compressor according to a tenth invention is the compressor according to the ninth invention, wherein the resin layer is formed in a portion that becomes a peripheral wall surface of the compression chamber, and the thick portion of the resin layer is The gap between the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber is formed so as to include the smallest portion.

  In this compressor, it is possible to reliably reduce friction loss due to sliding by providing a thick portion of the resin layer at a place where the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber are most likely to contact each other. .

  A compressor according to an eleventh invention is the compressor according to any one of the first to tenth inventions, wherein a recess is formed in a base material on which the resin layer is provided, and the resin layer is formed of the recess The part corresponding to is thicker than other parts.

  In this compressor, a resin layer having portions with different thicknesses can be easily formed. Moreover, the amount of swelling of resin can be easily adjusted by changing the shape of a recessed part.

  A compressor according to a twelfth aspect of the present invention is the compressor according to any one of the first to the 111th aspects, wherein the width of the concave portion is gradually narrowed from the opening end in the depth direction.

  In this compressor, when the resin layer swells, the portion corresponding to the concave portion of the resin layer swells so that the width gradually decreases toward the tip. Therefore, the contact area of the resin layer to the member facing the resin layer can be reduced as compared with the case where the portion corresponding to the concave portion of the resin layer swells with a constant width toward the tip.

  A compressor according to a thirteenth invention is the compressor according to any one of the first to twelfth inventions, wherein the surface of the resin layer is flat.

  In this compressor, the sealing property of the clearance gap between the member in which the resin layer was formed, and the member facing this member can be improved.

  A compressor according to a fourteenth aspect of the present invention is the compressor according to any one of the first to thirteenth aspects of the present invention, wherein the bending elastic modulus of the resin layer is a Young of two members provided so as to sandwich the resin layer. Less than at least one of the rates.

  In this compressor, the resin layer is easily bent when the member facing the resin layer and the resin layer come into contact with each other. At this time, the portion of the resin layer that contacts the opposing member has a large thickness, so that a relatively large elastic effect can be obtained. Therefore, damage to the resin layer can be prevented.

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

  In 1st invention, when a resin layer swells, only the thick part in a resin layer contacts an end plate member. Accordingly, friction loss due to sliding can be reduced as compared with the case where the entire resin layer is in contact with the end plate member.

  In 2nd invention, the sealing performance of the clearance gap between the axial direction end surface of a piston and an end plate member can be improved. Therefore, it is possible to prevent the refrigerant and the lubricating oil from leaking from the gap between the axial end surface of the piston and the end plate member, thereby reducing the refrigerant compression efficiency.

  In 3rd invention, the sealing performance of the clearance gap between the axial direction end surface of a piston and an end plate member can be improved further.

  In 4th invention, when a resin layer swells, only the thick part in a resin layer contacts the outer peripheral surface of a roller, or the surrounding wall surface of a compression chamber. Therefore, friction loss due to sliding can be reduced as compared with the case where the entire resin layer is in contact with the outer peripheral surface of the roller or the peripheral wall surface of the compression chamber.

  In the fifth aspect of the present invention, it is possible to reliably reduce friction loss due to sliding by providing a thick portion of the resin layer at a place where the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber are most likely to contact each other. it can.

  In 6th invention, when a resin layer swells, only the thick part in a resin layer contacts an end plate member. Accordingly, friction loss due to sliding can be reduced as compared with the case where the entire resin layer is in contact with the end plate member.

  In the seventh invention, the sealing performance of the gap between the axial end surface of the roller and the end plate member can be improved. Therefore, it is possible to prevent the refrigerant or the lubricating oil from leaking from the gap between the axial end face of the roller and the end plate member, thereby reducing the refrigerant compression efficiency.

  In the eighth invention, the sealing performance of the gap between the axial end surface of the roller and the end plate member can be further improved.

  In 9th invention, when a resin layer swells, only the thick part in a resin layer contacts the outer peripheral surface of a roller, or the surrounding wall surface of a compression chamber. Therefore, friction loss due to sliding can be reduced as compared with the case where the entire resin layer is in contact with the outer peripheral surface of the roller or the peripheral wall surface of the compression chamber.

  In the tenth invention, it is possible to reliably reduce friction loss due to sliding by providing a thick portion of the resin layer at a place where the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber are most likely to contact each other. it can.

  In the eleventh aspect, a resin layer having portions with different thicknesses can be easily formed. Moreover, the amount of swelling of resin can be easily adjusted by changing the shape of a recessed part.

  In the twelfth invention, when the resin layer swells, the portion corresponding to the concave portion of the resin layer swells so that the width gradually decreases toward the tip. Therefore, the contact area of the resin layer to the member facing the resin layer can be reduced as compared with the case where the portion corresponding to the concave portion of the resin layer swells with a constant width toward the tip.

  In the thirteenth invention, the sealing performance of the gap between the member on which the resin layer is formed and the member facing the member can be improved.

  In the fourteenth invention, when the member facing the resin layer comes into contact with the resin layer, the resin layer is easily bent. At this time, the portion of the resin layer that contacts the opposing member has a large thickness, so that a relatively large elastic effect can be obtained. Therefore, damage to the resin layer can be prevented.

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 in a figure. (A) is a perspective view which shows the base material of the piston of the compressor shown in FIG. 1, (b) is a perspective view which shows 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. FIG. 3 is a partially enlarged view of FIG. 2. It is a figure for demonstrating the procedure which forms the resin layer shown in FIG. It is a graph which shows the change of the magnitude | size of the radial clearance between the outer peripheral surface of a roller and the surrounding wall surface of a compression chamber when a roller moves as shown in FIG. 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 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. (A) is a perspective view of the base material of the roller and vane of the compressor shown in FIG. 11, and (b) is a perspective view of the roller and vane of the compressor shown in FIG. (A) is sectional drawing along the C1-C1 line of FIG. 12, (b) is sectional drawing along the C2-C2 line of FIG. It is the figure which showed typically the elements on larger scale of the compression mechanism of the compressor which concerns on the 1st modification of 1st Embodiment. It is the figure which showed typically the elements on larger scale of the compression mechanism of the compressor which concerns on the 2nd modification of 1st Embodiment. (A) is the figure which showed typically the elements on larger scale of the compression mechanism of the compressor which concerns on the 3rd modification of 1st Embodiment, (b) is the elements on larger scale of (a). It is a partial expanded sectional view of the piston of the compressor concerning the 4th modification of a 1st embodiment, (a) shows the state where the resin layer is not swollen, and (b) is the state where the resin layer is swollen Is shown. It is a partial expanded sectional view of the piston of the compressor concerning the 5th modification of a 1st embodiment, (a) shows the state where the resin layer is not swollen, and (b) is the state where the resin layer is swollen Is shown. It is a partial expanded sectional view of the piston of the compressor concerning the 6th modification of a 1st embodiment, (a) shows the state where the resin layer is not swollen, and (b) is the state where the resin layer is swollen Is shown. It is the figure which showed typically the elements on larger scale of the compression mechanism of the compressor concerning the 7th modification of a 1st embodiment, and (a) shows the state where the resin layer is not swollen, and (b) The state where the resin layer is swollen is shown. It is the figure which showed typically the elements on larger scale of the compression mechanism of the compressor which concerns on the 8th modification of 1st Embodiment, Comprising: (a) shows the state which the resin layer is not swollen, (b) The state where the resin layer is swollen is shown.

<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. An upper portion of the hermetic casing 2 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.

  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 made of a metal material.

  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 made of a metal material.

  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. The blade 42 is disposed between the pair of bushes 34 disposed in the blade accommodating portion 33 so as to advance and retreat.

  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, about 5 to 15 μm. When the compressor 1 is operated, normally, as shown in FIG. 5A, a minute gap D1 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 D2 (hereinafter, this gap is referred to as axial gaps D1 and D2).

  Further, as shown in FIG. 6, the outer diameter of the roller 41 is such that a gap d1 (hereinafter referred to as “gap”) is provided between the outer peripheral surface of the roller 41 and the peripheral wall surface of the compression chamber 31 in a state of being attached to the eccentric portion 8a. This is a size in which a radial gap d1) is generated. The radial gap d1 is very small, and the size thereof changes within a range of about 5 to 20 μm, for example, while the compressor 1 is being driven, as will be described in detail later. When the compressor 1 is in operation, normally, the lubricating oil L discharged from the discharge hole 8c of the shaft 8 exists in the radial gap d1 as shown in FIG. Further, since the radial gap is very small as described above, in the state where the blade 42 protrudes from the blade accommodating portion 33 toward the compression chamber 31 as shown in FIGS. A space formed between the outer peripheral surface of 41 and the peripheral wall surface of the compression chamber 31 is partitioned into a low pressure chamber 31 a and a high pressure chamber 31 b by the blade 42. Note that the leakage of refrigerant from the high pressure chamber 31b to the low pressure chamber 31a is suppressed by the lubricating oil L present in the axial gaps D1 and D2 and the radial gap d1.

  As shown in FIGS. 4B, 5A, and 6, the piston 40 of this embodiment includes a base material 43 made of a metal material and a thin-film resin layer 46 that covers the surface of the base material 43. , 47, 48. The outer shape of the base material 43 substantially constitutes the outer shape of the piston 40. The base material 43 is formed of a metal material.

  On the upper and lower surfaces of the base material 43, as shown in FIG. 4A, concave portions 44 each having an annular portion 44a and a straight portion 44b are formed. The annular portion 44 a of the concave portion 44 is formed in an annular shape along the inner peripheral surface of the roller 41 at portions corresponding to the roller 41 on the upper and lower surfaces of the base material 43. The annular portion 44 a is formed substantially at the center of the upper and lower surfaces of the base material 43 in the width direction of the base material 43 (the radial direction of the roller 41). The linear portion 44 b of the recess 44 is formed in a linear shape extending along the extending direction of the blade 42 in the portion corresponding to the blade 42 on the upper and lower surfaces of the base material 43. One end of the straight portion 44b is connected to the annular portion 44a. The straight portion 44 b is formed at substantially the center of the upper and lower surfaces of the base material 43 with respect to the width direction of the base material 43 (the vertical direction and the direction orthogonal to the extending direction of the blade 42). On the outer peripheral surface of the portion of the base material 43 corresponding to the roller 41, a concave portion 45 extending in the circumferential direction is formed over the entire surface. The recess 45 is formed at substantially the center of the base material 43 in the vertical direction. In addition, as shown to Fig.5 (a), the shape of the cross section orthogonal to the extending direction of the recessed parts 44 and 45 is a rectangular shape which one side opened. That is, the recesses 44 and 45 have a constant width from the opening end to the bottom surface.

  The resin layers 46 and 47 cover the entire upper and lower surfaces of the base material 43, respectively. That is, the resin layers 46 and 47 are formed on the entire upper end surface and lower end surface of the piston 40. The resin layer 48 is formed on the entire outer peripheral surface of the roller 41. The bending elastic modulus of each resin layer 46, 47, 48 is smaller than the Young's modulus of any of the two members provided so as to sandwich the resin layer. The two members provided so as to sandwich the resin layer are the base material 43 and the front head 20 for the resin layer 46 formed on the upper end surface of the piston 40, and the resin formed on the lower end surface of the piston 40. The layer 47 is the base material 43 and the rear head 50, and the resin layer 48 formed on the outer peripheral surface of the roller 41 is the base material 43 and the cylinder 30. Examples of the resin material constituting the resin layers 46, 47, and 48 include polyamideimide, polytetrafluoroethylene, and the like, or a mixture thereof.

  At the time of shipment of the compressor 1, the resin layers 46, 47, 48 are hardly swollen (slightly swollen or not swollen at all), and as shown in FIG. The surface of 48 is flat. The portions corresponding to the recesses 44 and 45 formed in the base material 43 in the resin layers 46, 47 and 48 are thick portions 46a, 47a and 48a. The film thickness La1 of the thick portions 46a, 47a, 48a is larger than the film thickness Lb1 of the portions other than the thick portions 46a, 47a, 48a of the resin layers 46, 47, 48 formed on the surface of the substrate 43. It is thicker by the depth of the recesses 44 and 45. That is, the resin layers 46 and 47 formed on the upper and lower end surfaces of the roller 41 (that is, the resin layers 46 and 47 formed on the upper and lower end surfaces corresponding to the roller 41 of the base material 43) There are two different thicknesses in the radial direction. The resin layers 46 and 47 formed on the upper and lower end surfaces of the blade 42 (that is, the resin layers 46 and 47 formed on the upper and lower end surfaces corresponding to the blade 42 of the base member 43) There are two different thicknesses in the width direction. The resin layer 48 formed on the outer peripheral surface of the roller 41 (that is, the resin layer 48 formed on the side surface of the portion corresponding to the roller 41 of the base material 43) has two different thicknesses in the vertical direction. is doing.

  In the present embodiment, the thickness La1 of the thick portions 46a, 47a, 48a of the resin layers 46, 47, 48 that are hardly swollen at the time of shipment of the compressor 1 is, for example, about 50 to 100 μm. The film thickness Lb1 of portions other than 46a, 47a, and 48a is, for example, about 5 to 10 μm. The film thickness is not limited to this thickness.

  Further, when the use of the compressor 1 is started, the resin layers 46, 47, and 48 absorb the lubricating oil L and the refrigerant and completely swell as shown in FIG. At this time, if the film thicknesses of the thick portions 46a, 47a, 48a of the resin layers 46, 47, 48 are La2, and the thicknesses other than the thick portions 46a, 47a, 48a are Lb2, the thick portions 46a, 47a, 48a. The amount of swelling (La2-La1) is greater than the amount of swelling in other parts (Lb2-Lb1). Therefore, as shown in FIG.5 (b), the surface of the resin layers 46, 47, 48 will be in the state where the thick part 46a, 47a, 48a swelled. At this time, the swelled portions of the thick portions 46a, 47a, 48a have a constant width toward the tip. Therefore, when the upper and lower end surfaces of the piston 40 are in contact with the front head 20 and the rear head 50, they are contacted at the thick portions 46a and 47a of the resin layers 46 and 47 formed on the upper and lower end surfaces of the piston 40. Further, when the outer peripheral surface of the roller 41 comes into contact with the peripheral wall surface of the compression chamber 31, the roller 41 comes into contact with the thick portion 48 a of the resin layer 48 formed on the outer peripheral surface of the roller 41.

  Here, the procedure for forming the resin layers 46, 47 and 48 will be described with reference to FIG. FIG. 7 shows the process of forming the resin layer 46 formed on the upper end surface of the blade 42. First, as shown in FIG. 7A, a base material 43 on which the above-described recess 44 is formed is prepared. Next, the step of applying the resin composition solution to the surface of the base material 43 and drying it is performed several times. As a result, as shown in FIG. 7B, a resin layer 46 b having a substantially uniform thickness is formed on the surface of the base material 43. That is, the surface of the resin layer 46b is depressed in the portion where the recess 44 is formed. Finally, the surface of the resin layer 46b is flattened by grinding to form the resin layer 46 as shown in FIG. Thereby, resin layers 46, 47, and 48 having two different thicknesses are formed. The method of forming the resin layers 46, 47, and 48 is not limited to the method described above.

  Next, operation | movement of the compressor 1 of this embodiment is demonstrated with reference to Fig.2 (a)-FIG.2 (d), and FIG. 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). The graph shown in FIG. 8 outlines the change in the radial gap d1 with respect to the rotation angle θ of the shaft 8 (shown by a solid line in the figure) and the outline of the pressure change in the high-pressure chamber 31b (shown by a broken line in the figure). It is a thing.

  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.

  As shown in FIG. 8, the size of the radial gap d1 between the outer peripheral surface of the roller 41 and the peripheral wall surface of the compression chamber 31 is the maximum until the shaft 8 is rotated 90 ° from the top dead center. From there, it gradually becomes smaller and becomes the minimum between the position where the shaft 8 is rotated 180 ° and the time when the shaft 8 is rotated 270 °.

  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. In addition, when the shaft 8 rotates to the vicinity of the position where the radial gap d1 is minimized, the pressure of the refrigerant in the high pressure chamber 31b reaches a predetermined pressure at which the valve mechanism opens. 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, in the compressor 1 of the present embodiment, the resin layers 46 and 47 having the thick portions 46a and 47a are formed on the upper and lower end surfaces of the piston 40. Further, a resin layer 48 having a thick portion 48 a extending in the circumferential direction of the roller 41 is formed on a portion that becomes the outer peripheral surface of the roller 41. Therefore, when the resin layers 46, 47, 48 are swollen, only the thick portions 46a, 47a, 48a in the resin layers 46, 47, 48 are opposed to each other (that is, the front head 20, the rear head 50, the compression chamber 31). (Peripheral wall surface). Therefore, friction loss due to sliding can be reduced as compared with the case where the entire resin layers 46, 47, and 48 are in contact with these opposing members.

  In the compressor 1 of the present embodiment, the resin layers 46 and 47 are formed on the entire upper and lower end surfaces of the piston 40. Therefore, the sealing performance of the axial gap can be improved. Therefore, it is possible to suppress the refrigerant or lubricating oil from leaking from the axial gap and the compression efficiency of the refrigerant from being lowered.

  Further, in the compressor 1 of the present embodiment, the thick portions 46 a and 47 a of the resin layers 46 and 47 are formed over the entire circumference of the roller 41. Therefore, the sealing performance of the axial gap can be further improved.

In addition, in the compressor 1 of the present embodiment, the flexural modulus of the resin layers 46, 47, and 48 is smaller than the Young's modulus of two members provided so as to sandwich the resin layer. Therefore, when the resin layers 46, 47, 48 come into contact with members facing them, the resin layers 46, 47, 48 bend.
Here, as described above, the resin layers 46, 47, and 48 are in contact with opposing members in the thick-walled portions 46a, 47a, and 48a. Therefore, when the resin layers 46, 47, 48 are bent at the time of contact with the facing member, a relatively large elastic effect can be obtained. Therefore, the surface pressure applied to the resin layers 46, 47, 48 can be reduced, and damage to the resin layers 46, 47, 48 can be prevented.
For the purpose of increasing the elastic effect and preventing damage to the resin layer, when the thickness of the resin layer, which has been conventionally formed with a uniform thickness, is increased overall, if the thickness of the resin layer is small Compared with the amount of swelling, it becomes easier to contact the opposing member. Therefore, a reduction in efficiency due to friction loss becomes a problem. However, in the present embodiment, as described above, when the resin layers 46, 47, 48 are swollen, only a part of the resin layers 46, 47, 48 is in contact with the opposing member. It is possible to reduce friction loss due to sliding while preventing damage to 46, 47, and 48.

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. 9, 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 has a bearing hole 121, a discharge hole 122 (see FIG. 10), 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. 10, 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. The piston 140, like the piston 40 of the first embodiment, is a resin having a base material 43 made of a metal material and a thin film covering the surface of the base material 43 and having thick portions 46a, 47a, 48a. The layers 46, 47, and 48 are configured.

  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.

  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, like the piston 40 of the first embodiment, is a resin having a base material 43 made of a metal material and a thin film covering the surface of the base material 43 and having thick portions 46a, 47a, 48a. The layers 46, 47, and 48 are configured.

  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 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, resin layers 46, 47, and 48 having thick portions 46a, 47a, and 48a are provided on the upper and lower end surfaces of the pistons 140 and 170 and the outer peripheral surface of the roller 41, as in the first embodiment. Therefore, when the resin layers 46, 47, and 48 come into contact with the opposing members, the same effect as in 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. 11, 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. 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 251 is disposed inside the vane housing portion 233. As illustrated in FIG. 12, the vane 251 is a flat plate-like member, and the vertical length thereof is the same as the vertical length of the roller 241. The distal end portion of the vane 251 on the center side of the compression chamber 231 (lower distal end portion in FIG. 11) is formed in a tapered shape as viewed from above. The vane 251 is urged by an urging spring 234 provided in the vane accommodating portion 233, and the tip portion on the compression chamber 231 side is pressed against the outer peripheral surface of the roller 241. Therefore, as shown in FIGS. 11A to 11D, when the roller 241 moves along the peripheral wall surface of the compression chamber 231 as the shaft 8 rotates, the vane 251 is moved in the vane accommodating portion 233. Then, it moves forward and backward along the radial direction of the compression chamber 231. In addition, as shown in FIGS. 11B to 11D, when the vane 251 protrudes from the vane accommodating 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 between is divided into a low pressure chamber 231a and a high pressure chamber 231b by a vane 251.

  As shown in FIG. 12B and FIGS. 13A and 13B, the roller 241 includes a base material 242 made of a metal material and thin resin layers 246 and 247 covering the surface of the base material 242. 248. The vane 251 includes a base material 252 made of a metal material and thin film resin layers 256 and 257 that cover the surface of the base material 252. The outer shapes of the base materials 242 and 252 substantially constitute the outer shapes of the roller 241 and the vane 251, respectively.

  An annular recess 244 is formed on the upper and lower surfaces of the base material 242 over the entire circumference. The concave portion 244 is formed substantially at the center of the upper and lower surfaces of the base material 242 in the width direction of the base material 242 (the radial direction of the roller 241). Concave portions 245 extending in the circumferential direction are formed on the outer peripheral surface of the base material 242. The concave portion 245 is formed at substantially the center of the base material 242 in the vertical direction. On the upper and lower surfaces of the base 252, linear recesses 254 extending along the extending direction of the vanes 251 are formed. The concave portion 254 is formed at substantially the center of the upper and lower surfaces of the substrate 252 with respect to the width direction of the substrate 252 (the direction perpendicular to the vertical direction and the extending direction of the vanes 251).

  The resin layers 246 and 247 of the roller 241 cover the upper surface and the lower surface of the base material 242, respectively. That is, the resin layers 246 and 247 are formed on the upper end surface and the lower end surface of the roller 241. The resin layer 248 is formed on the outer peripheral surface of the roller 241. In the resin layers 246, 247, and 248, portions corresponding to the recesses 244 and 245 formed in the base material 242 are thick portions 246a, 247a, and 248a.

  The resin layers 256 and 257 of the vane 251 cover the upper surface and the lower surface of the substrate 252, respectively. That is, the resin layers 256 and 257 are formed on the upper end surface and the lower end surface of the vane 251. In the resin layers 256 and 257, portions corresponding to the concave portions 254 formed in the base material 252 are thick portions 256a and 257a.

  The material and film thickness of the resin layers 246, 247, 248, 256, 257 are the same as those of the resin layers 46, 47, 48 of the piston 40 of the first embodiment.

Next, the operation of the compressor of this embodiment will be described.
FIG. 11A shows a state in which the roller 241 is at the top dead center. FIGS. 11B to 11D 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. 11 (a) to 11 (d), 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 figure from the state of FIG. 11A, 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. 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. 11 (b) to 11 (d), so that the suction tube 3 enters the low-pressure chamber 231a through the suction hole 232. The refrigerant 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, thick portions 246a, 247a, 248a are formed on the upper and lower end surfaces of the roller 241, the outer peripheral surface of the roller 241, and the upper and lower end surfaces of the vane 251, similarly to the resin layers 46, 47, 48 of the first embodiment. Since the resin layers 246, 247, 248, 256, and 257 having 256a and 257a are formed, when the resin layers 246, 247, 248, 256, and 257 come into contact with opposing members, Similar effects can be obtained.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

For example, in the first embodiment described above, the case where the resin layer 48 is formed on the outer peripheral surface of the roller 41 has been described, but the present invention is not limited to this. As shown in FIG. 14, in the first modification of the first embodiment, a resin layer 337 formed on the peripheral wall surface of the compression chamber 31 is provided instead of the resin layer 48 formed on the outer peripheral surface of the roller 41. is doing. In such a modification, the cylinder 330 includes a base material 335 made of a metal material and a thin resin layer 337 that covers the inner peripheral surface of the base material 335. A concave portion 336 extending in the circumferential direction is formed on the inner peripheral surface of the base material 335 over substantially the entire circumference (a portion excluding a portion where the suction hole 32 and the blade accommodating portion 33 are formed). And the part corresponding to the recessed part 336 of the resin layer 337 is the thick part 337a. Even in such a case, the same effect as in the first embodiment can be obtained when the resin layer 337 contacts the outer peripheral surface of the opposing roller 41. Note that this modification can also be applied to the second and third embodiments described above.

  Further, in the first embodiment described above, the recesses 44 and 45 are formed in the base material 43 of the piston 40, and the portions corresponding to the recesses 44 and 45 in the resin layers 46, 47 and 48 are thick portions 46a and 47a. However, the present invention is not limited to this. As shown in FIG. 15, in the second modification of the first embodiment, no recess is formed on the surface of the base material 443 on which the resin layers 446, 447, 448 are formed, and the resin layers 446, 447, Thick portions 446a, 447a, 448a are formed by providing protrusions on 448. This modification can also be applied to the second and third embodiments described above.

  Further, in the first embodiment described above, the resin layers 46 and 47 are formed on the entire upper and lower end surfaces of the piston 40, and the resin layer 48 is formed on the entire outer peripheral surface of the roller 41. However, the present invention is not limited to this.

  As shown in FIGS. 16A and 16B, in the third modification of the first embodiment, the resin layers 546, 547 and 548 are orthogonal to the extending direction of the recesses 44 and 45 and the recesses 44 and 45. It is formed only in regions on both sides of the recesses 44 and 45 with respect to the direction. In the present modification, the surface of the piston 40 is not flat, and there is a step at the boundary between the portion where the base material 43 is exposed and the portion where the resin layers 546, 547, and 548 are formed. This modification can also be applied to the second and third embodiments described above.

  In the above-described first embodiment, the case where the concave portions 44 and 45 have a constant width from the opening end to the bottom surface is described, but the present invention is not limited to this.

  As shown in FIGS. 17A and 17B, which are cross-sectional views orthogonal to the extending direction of the recess 644 formed on the upper surface of the base material 43, in the fourth modification example of the first embodiment, the recess 644. The cross-sectional shape is a semicircular shape. That is, the width of the recess 644 (the length along the left-right direction in FIG. 17) is the widest at the opening end, and gradually becomes narrower along the depth direction (the direction from the upper side to the lower side in FIG. 17). Yes. The depth of the concave portion 644 is deepest at the center portion in the width direction, and gradually increases from a portion corresponding to both ends in the width direction to a portion corresponding to the center portion. In addition, since the recessed part formed in the lower surface of the base material 43 and the recessed part formed in the outer peripheral surface of the part corresponding to the roller 41 of the base material 43 are also the shapes similar to the recessed part 644, explanation is given here. Omitted.

  The thickness of the thick portion 646a of the resin layer 646 covering the upper surface of the base material 43 as described above is the thickest in the portion corresponding to the central portion in the width direction of the recess 644, and the portions corresponding to both ends in the width direction of the recess 644. It gradually becomes thicker from the part corresponding to the central part. Here, the swelling amount of the resin layer is substantially proportional to the thickness of the resin layer. Therefore, in this modification, as shown in FIG. 17B, when the resin layer 646 is completely swollen, the swelling amount of the resin layer 646 is the largest in the portion corresponding to the central portion in the width direction of the recess 644. The concave portion 644 gradually increases from a portion corresponding to both ends in the width direction to a portion corresponding to the central portion. That is, the thick part 646a of the resin layer 646 is in a state of swelling in a semicircular shape.

  In this modification, when the upper end surface of the piston 40 contacts the front head 20, only the upper end portion of the thick portion 646a that swells in a semicircular shape contacts. Therefore, the contact area between the resin layer 646 and the front head 20 can be reduced as compared with the case where the entire thick portion 646 a is in contact with the front head 20. Therefore, friction loss due to sliding can be further reduced. This modification can also be applied to the second and third embodiments described above.

  As in the modification described above, the shape of the concave portion whose width is widest at the opening end and gradually narrows in the depth direction is shown in FIGS. 18A, 18B, and 19. The ones shown in (a) and (b) are also conceivable.

  As shown in FIGS. 18A and 18B, in the fifth modification of the first embodiment, the shape of the cross section of the recess 744 is V-shaped. The thick portion 746a of the resin layer 746 covering the upper surface of the base material 43 in which the concave portion 744 is formed has a substantially inverted V shape when completely swollen as shown in FIG. It becomes inflated. Therefore, when the upper end surface of the piston 40 contacts the front head 20, only the upper end portion of the thick portion 746 a swelled in a substantially inverted V shape contacts, so that the contact area between the resin layer 746 and the front head 20 Can be reduced. Moreover, since the upper end part of the thick part 746a is thin compared with the above-mentioned 4th modification, the contact area with the front head 20 can be made still smaller. This modification can also be applied to the second and third embodiments described above.

  As shown in FIGS. 19A and 19B, in the sixth modification of the first embodiment, the cross-sectional shape of the recess 844 is an inverted trapezoidal shape. The thick portion 846a of the resin layer 846 covering the upper surface of the base material 43 in which such a recess 844 is formed swells into a substantially trapezoidal shape when completely swollen as shown in FIG. 19 (b). It becomes a state. Therefore, when the upper end surface of the piston 40 is in contact with the front head 20, only the upper end portion of the thick portion 846a swelled in a substantially trapezoidal shape is in contact, so the contact area between the resin layer 846 and the front head 20 is reduced. it can. This modification can also be applied to the second and third embodiments described above.

  In the fourth to sixth modifications of the first embodiment described above, the case where the depth of the recess is the deepest at the center portion in the width direction has been described, but the present invention is not limited to this. That is, for example, the shape of the concave portion is such that the depth is the deepest at one end in the width direction, and the depth gradually decreases from one end to the other end in the width direction. It may be.

  As shown in FIG. 20, in the seventh modification of the first embodiment, recesses 944 a and 945 a are further formed at the bottoms of the recesses 944 and 945 formed in the base material 43. The recesses 944a and 945a extend along the extending direction of the recesses 944 and 945. That is, the recesses 944 and 945 are composed of a relatively shallow portion and a deep portion. The resin layers 946, 947, 948 are formed in the recesses 944, 945, and the portions corresponding to the recesses 944a, 945a are thick portions 946a, 947a, 948a. In this modification, the surfaces of the resin layers 946, 947, and 948 substantially coincide with the surface of the base material 43, and the surface of the piston 40 is flat. In this modified example, as shown in FIG. 20B, when the piston 40 comes into contact with the opposing member, the thick portions 946a, 947a, 948a of the resin layers 946, 947, 948 come into contact with each other. In addition, the base material 43 of the piston 40 made of a metal material and the opposing members (front head 20, rear head 50, cylinder 30) are not in direct contact. This modification can also be applied to the second and third embodiments described above.

Further, as shown in FIG. 21, in the eighth modification of the first embodiment, concave portions 1044 are respectively formed on the outer edge portions of the upper and lower end surfaces of the portion corresponding to the roller 41 of the base material 43. That is, each recess 1044 is open in two directions, that is, the upper end surface or lower end surface of the portion corresponding to the roller 41 of the base material 43 and the outer peripheral surface. The concave portion 1044 includes a first portion 1044a extending along the upper end surface or the lower end surface of the roller 41 and a second portion 1044b extending along the outer peripheral surface, and the cross-sectional shape thereof is a bowl shape. The resin layers 1046 and 1047 are formed in the recess 1044. In the present modification, the surfaces of the resin layers 1046 and 1047 substantially coincide with the surface of the base material 43, and the surface of the piston 40 is flat. The resin layers 1046 and 1047 are thick portions where the radially outer portions of the upper and lower end surfaces of the roller 41 are thicker than the radially inner portion. The upper and lower edge portions of the outer peripheral surface of the roller 41 are thicker than the inner portion. That is, the resin layers 1046 and 1047 have two different thicknesses in the radial direction of the roller 41 and two different thicknesses in the vertical direction.
In the present modification, as shown in FIG. 21B, when the resin layers 1046 and 1047 swell, the thick portions on the upper and lower end surfaces and the outer peripheral surface of the rollers 41 of the resin layers 1046 and 1047 Swells much more than the part. When the piston 40 comes into contact with the opposing member, the piston 40 comes into contact with the thick portions of the resin layers 1046 and 1047, so that the base member 43 of the piston 40 made of a metal material and the opposing member (the front head 20). There is no direct contact between the rear head 50 and the cylinder 30). That is, in this modification, the resin layers 1046 and 1047 can exert an effect on the contact with the front head 20 or the rear head 50 and the contact with the cylinder 30. Note that this modification can also be applied to the second and third embodiments described above.

  Further, in the first to third embodiments described above, the thick portions 46a and 47a (246a and 247a) of the resin layers 46 and 47 (246 and 247) formed on the upper and lower end surfaces of the roller 41 (241) are the rollers. Although the case where it formed over the perimeter of 41 (241) was demonstrated, it is not limited to this. In the first embodiment, the thick portions 46 a and 47 a may be formed on at least a part of the upper and lower end surfaces of the piston 40. In the second embodiment, the thick portions 246a, 247a, 256a, and 257a may be formed on at least a part of the upper and lower end surfaces of the roller 241 and the upper and lower end surfaces of the vane 251.

  In addition, in the above-described first and second embodiments, the case where the thick portion 48a of the resin layer 48 formed on the outer peripheral surface of the roller 41 extends in the circumferential direction over the entire outer peripheral surface of the roller 41 has been described. However, it is not limited to this. The thick portion 48 a is at least in the radial direction between the outer peripheral surface of the roller 41 and the peripheral wall surface of the compression chamber 31 when the roller 41 moves along the peripheral wall surface of the compression chamber 31 on the outer peripheral surface of the roller 41. It suffices if the gap d1 is formed near the portion where the gap d1 is smallest (see FIG. 8). In this case, by providing a resin layer at a place where the outer peripheral surface of the roller 41 and the peripheral wall surface of the compression chamber 31 are most likely to come into contact with each other, frictional loss due to sliding can be reduced while reliably obtaining the elastic effect of the resin layer. can do.

  In addition, in the first modification of the first embodiment described above, at least the roller 41 extends along the peripheral wall surface of the compression chamber 31 in the thick portion 337 a of the resin layer 337 formed on the peripheral wall surface of the compression chamber 31. When it moves, it should just be formed in the part vicinity where the radial direction gap d1 between the outer peripheral surface of the roller 41 and the peripheral wall surface of the compression chamber 31 becomes the smallest. This modification can also be applied to the second and third embodiments described above.

  In the first to third embodiments described above, the bending elastic modulus of the resin layer has been described as being smaller than the Young's modulus of any of the two members provided so as to sandwich the resin layer. Is not limited. That is, the bending elastic modulus of the resin layer only needs to be smaller than at least one of the Young's moduli of two members provided so as to sandwich the resin layer. Furthermore, the Young's modulus of any of the two members provided so as to sandwich the resin layer may be used.

  In addition, in the first to third embodiments described above, the resin layers 46 and 47 (246 and 247) formed on the upper and lower end surfaces of the roller 41 (241) have one thickness in the radial direction of the roller 41 (241). Although the case where it has the flesh portions 46a, 47a (246a, 247a) has been described, a plurality of the thick portions 46a, 47a (246a, 247a) may be provided in the radial direction of the roller 41 (241). . Similarly, the resin layers 46 and 47 formed on the upper and lower end surfaces of the blade 42 of the first and second embodiments, and the resin layers 246 and 257 formed on the upper and lower end surfaces of the vane 251 of the third embodiment are also shown in FIG. A plurality of thick portions 46a, 47a (256a, 257a) may be provided in the width direction of 42 (vane 251). Further, the resin layer 48 (248) formed on the outer peripheral surface of the roller 41 (241) of the first to third embodiments may also be provided with a plurality of thick portions 48a (248a) in the vertical direction. .

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

  Further, in the third embodiment described above, the compression mechanism including the roller 241 and the vane 251 is applied to a one-cylinder rotary compressor, but may be applied to a two-cylinder rotary compressor.

  By using the present invention, friction loss due to sliding can be reduced.

1 Compressor 20, 120 Front head (first end plate member)
30, 130, 160, 230 Cylinder 31, 131, 161, 231 Compression chamber 31a, 231a Low pressure chamber 31b, 231b High pressure chamber 33, 133 Blade housing portion 40, 140, 170 Piston 41, 241 Roller 42 Blade 44, 45, 244 245, 254, 336, 644, 744, 844, 944, 945, 1044 Recess 46, 47, 48, 246, 247, 248, 256, 257, 337, 446, 447, 448, 546, 547, 548, 646 , 746, 846, 946, 947, 948, 1046, 1047 Resin layer 50, 180 Rear head (second end plate member)
233 Vane receiving portion 251 Vane

Claims (14)

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 axial 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 compressor characterized in that a resin layer having portions with different thicknesses is formed on the entire surface or a part of a portion serving as an axial end surface of the piston.   The compressor according to claim 1, wherein the resin layer is formed on the entire surface of the end surface in the axial direction of the piston.   The compressor according to claim 1, wherein the thick portion of the resin layer is formed over the entire circumference of the roller. 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 axial 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 having portions having different thicknesses in the axial direction of the roller is formed on the whole or a part of any one of the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber. Compressor.   The thick portion in the resin layer is formed so as to include a portion in which a gap between the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber becomes the smallest. Compressor. A cylinder having a compression chamber and a vane accommodating portion communicating with the compression chamber;
A first end plate member and a second end plate member disposed at both axial 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 compressor characterized in that a resin layer having portions having different thicknesses is formed on the entire surface or a part of at least one of the portions serving as the axial end surface of the roller and the axial end surface of the vane. .   The compressor according to claim 6, wherein the resin layer is formed on the entire axial end surface of the roller.   The compressor according to claim 6 or 7, wherein the thick portion of the resin layer is formed over the entire circumference of the roller. A cylinder having a compression chamber and a vane accommodating portion communicating with the compression chamber;
A first end plate member and a second end plate member disposed at both axial 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 having portions having different thicknesses in the axial direction of the roller is formed on the whole or a part of any one of the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber. Compressor. The resin layer is formed on a portion that becomes a peripheral wall surface of the compression chamber,
The thick portion of the resin layer is formed so as to include a portion where the gap between the outer peripheral surface of the roller and the peripheral wall surface of the compression chamber is the smallest. Compressor. The substrate on which the resin layer is provided has a recess,
The compressor according to any one of claims 1 to 10, wherein the resin layer is thicker in a portion corresponding to the concave portion than in other portions.   The compressor according to any one of claims 1 to 11, wherein a width of the concave portion is gradually narrowed in a depth direction from an opening end thereof.   The compressor according to any one of claims 1 to 12, wherein a surface of the resin layer is flat. The compression according to any one of claims 1 to 13, wherein a bending elastic modulus of the resin layer is smaller than at least one of Young's moduli of two members provided so as to sandwich the resin layer. Machine.

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