Helical compressor

Abstract

[Problem] To provide a helical compressor capable of restricting the movement of a blade in a spiral direction and satisfactorily forming a compression chamber by preventing the blade from separating from a cylinder inner peripheral surface. [Solution] This helical compressor 1 comprises: a cylinder 2; a roller 4 which is disposed on the inner side of the cylinder and revolves; a spiral blade 7 which defines a compression chamber 37 formed between the cylinder 2 and the roller 4; and a spiral groove 38 into which the blade 7 is fitted so as to be capable of protruding and retracting. The volume of the compression chamber 37 decreases while advancing in a thrust direction of the cylinder 2 due to the revolution of the roller 4, thereby compressing a working fluid suctioned into the compression chamber 37. The helical compressor includes a restriction part that restricts the movement of the blade 7 in a spiral direction, and a pressing part that presses the blade 7 against an inner peripheral surface of the cylinder 2.

Description

Helical Compressor

[0001] The present invention relates to a helical compressor that compresses a working fluid by partitioning a compression chamber between a cylinder and a roller that revolves inside the cylinder with a spiral blade.

[0002] Conventionally, a helical compressor has a cylinder, a roller provided inside the cylinder, and a blade that partitions a compression chamber between the cylinder and the roller. The roller revolves with respect to the cylinder, and thereby the volume of the compression chamber is decreased while progressing in the thrust direction of the cylinder, so as to compress the working fluid sucked into the compression chamber (see, for example, Patent Document 1 and Patent Document 2).

[0003] In that case, a spiral groove is formed on the outer surface of the roller, and the blade is structured to be fitted in and out of the groove.

[0004] Japanese Patent No. 3805911 Japanese Unexamined Patent Application Publication No. 2006-77745

[0005] Here, at the initial stage of startup where the influence of frictional force is strong, when the blade comes out of the spiral groove, the frictional force acts in the direction in which the blade separates from the inner peripheral surface of the cylinder. In particular, on the suction side where it is difficult to apply differential pressure, the pressing force due to the differential pressure also becomes small, so the blade separates from the inner peripheral surface of the cylinder, and it becomes impossible to form a compression chamber, resulting in poor volumetric efficiency.

[0006] Therefore, in Patent Document 1, a blade stopper that presses the blade toward the cylinder side is provided. However, in the structure of Patent Document 1, there is a problem that the blade separates from the blade stopper, or the blade moves in the spiral direction, and movement in the radial direction (radius direction) is allowed.

[0007] Also, in Patent Document 2, a blade stopper is inserted into the through hole of the blade, but it has been difficult to prevent the blade from separating from the cylinder.

[0008] The present invention has been made to solve the aforementioned conventional technical problems, and aims to provide a helical compressor that can restrict the movement of the blades in the helical direction and can form a good compression chamber by preventing the blades from separating from the inner circumferential surface of the cylinder.

[0009] The helical compressor of the present invention comprises a cylinder, a roller disposed inside the cylinder and revolving relative to the cylinder, a helical blade that partitions a compression chamber formed between the cylinder and the roller, and a helical groove formed on the outer circumferential surface of the roller into which the blade can be inserted and retracted, wherein the volume of the compression chamber decreases as it advances in the thrust direction of the cylinder due to the revolving roller, thereby compressing the working fluid drawn into the compression chamber, and is characterized by comprising a restricting part that restricts the movement of the blade in the helical direction and a pressing part that presses the blade against the inner circumferential surface of the cylinder.

[0010] The helical compressor of the second invention is characterized in that the regulating portion and the pressing portion in the above invention are provided near the end of the blade on the side in which the working fluid is drawn into the compression chamber.

[0011] The helical compressor of the third invention is characterized in that, in the present invention, it comprises a blade through hole formed from the cylinder side to the roller side of the blade, and a cylinder through hole formed in the cylinder at a position corresponding to the blade through hole, the blade through hole has an engaging portion located on the roller side, and a fixing member inserted from the cylinder side through the cylinder through hole and the blade through hole engages with the engaging portion to form a regulating portion and a pressing portion.

[0012] The helical compressor of the fourth invention is characterized in that, in the third invention, the engaging portion is composed of an expanding portion located on the roller side of the blade through hole, and the fixing member is composed of a bolt inserted from the cylinder side through the cylinder through hole and the blade through hole, and a nut screwed onto the tip of the bolt, the bolt acting as a restricting portion to restrict the movement of the blade in the helical direction, and the nut entering the expanding portion and engaging with the blade, thereby acting as a pressing portion and pressing the blade against the inner circumferential surface of the cylinder.

[0013] The fifth helical compressor is characterized in that, in the fourth invention, the nut is held within the enlarged portion of the blade through hole.

[0014] The helical compressor of the sixth invention is characterized in that, in the third invention, the engaging portion is composed of an expanding portion located on the roller side of the blade through hole, and the fixing member has a shaft portion inserted from the cylinder side through the cylinder through hole and the blade through hole, and a spring portion provided at the tip of the shaft portion and constantly biased in a direction that expands by elasticity, the shaft portion acts as a restricting portion to restrict the movement of the blade in the helical direction, and the spring portion expands at the expanding portion and engages with the blade, so that the spring portion becomes a pressing portion and presses the blade against the inner circumferential surface of the cylinder.

[0015] The present invention relates to a helical compressor comprising a cylinder, a roller disposed inside the cylinder and revolving around the cylinder, a helical blade that partitions a compression chamber formed between the cylinder and the roller, and a helical groove formed on the outer circumferential surface of the roller into which the blade can be inserted and retracted, wherein the volume of the compression chamber decreases as it progresses in the thrust direction of the cylinder due to the revolving roller, thereby compressing the working fluid drawn into the compression chamber. The present invention provides a restricting part that restricts the movement of the blade in the helical direction and a pressing part that presses the blade against the inner circumferential surface of the cylinder. Thus, the restricting part can restrict the movement of the blade in the helical direction, and the pressing part can press the blade against the inner circumferential surface of the cylinder.

[0016] This eliminates or suppresses the problem of the blades separating from the inner surface of the cylinder due to friction during initial startup, thereby forming a good compression chamber, maintaining the desired compression ratio, and efficiently compressing the working fluid.

[0017] Furthermore, as in the second invention, by providing the restricting portion and the pressing portion near the end of the blade on the side where the working fluid is drawn into the compression chamber, it becomes possible to effectively restrict the spiral movement of the blade on the working fluid intake side, where differential pressure is difficult to build up in the initial stages of startup, and to press the blade against the inner circumferential surface of the cylinder.

[0018] In this case, as in the third invention, a blade through-hole is formed from the cylinder side to the roller side of the blade, a cylinder through-hole is formed in the cylinder at a position corresponding to this blade through-hole, an engaging portion is provided on the roller side of the blade through-hole, and a fixing member is inserted from the cylinder side through the cylinder through-hole and the blade through-hole and engaged with the engaging portion, thereby forming a restricting portion and a pressing portion. This allows the fixing member to restrict the spiral movement of the blade and to press the blade against the inner circumferential surface of the cylinder, thereby simplifying the structure.

[0019] For example, as in the fourth invention, if the engaging portion is configured from an expanding portion located on the roller side of the blade through-hole, and the fixing member is configured from the cylinder side through the cylinder through-hole and the blade through-hole, and a nut screwed onto the tip of this bolt, the bolt acts as a restricting portion to restrict the spiral movement of the blade, and the nut enters the expanding portion and engages with the blade, so that the nut acts as a pressing portion and presses the blade against the inner circumferential surface of the cylinder, then a fixing member can be simply configured with a bolt and a nut, thereby restricting the spiral movement of the blade and pressing it against the inner circumferential surface of the cylinder.

[0020] In this case, if the nut is held within the enlarged portion of the blade through-hole as in the fifth invention, the bolt can be easily screwed into the nut by inserting the bolt into the cylinder through-hole and the blade through-hole while the nut is positioned within the enlarged portion of the blade through-hole, thereby improving assembly workability.

[0021] Furthermore, for example, as in the sixth invention, if the engaging portion is configured from an expanding portion located on the roller side of the blade through-hole, and the fixing member is configured from the cylinder side through the cylinder through-hole and the blade through-hole, and a spring portion provided at the tip of the shaft portion and constantly biased to expand by elasticity, the shaft portion acts as a restricting portion to restrict the spiral movement of the blade, and the spring portion expands at the expanding portion and engages with the blade, so that the spring portion becomes a pressing portion and presses the blade against the inner circumferential surface of the cylinder, then by simply inserting the fixing member into the cylinder through-hole and the blade through-hole, the shaft portion restricts the spiral movement of the blade and the spring portion expands to press the blade against the inner circumferential surface of the cylinder, thereby further improving the workability of assembly.

[0022] This is a front view of a helical compressor according to one embodiment of the present invention (Embodiment 1). This is a side view of the helical compressor of Figure 1, seen from one side. This is a cross-sectional view taken along line A-A in Figure 1. This is an enlarged view of portion B in Figure 3. This is a cross-sectional view taken along line C-C in Figure 2. This is a cross-sectional view corresponding to Figure 3 of a helical compressor according to another embodiment of the present invention (Embodiment 2). This is an enlarged view of portion D in Figure 6. This is a cross-sectional view corresponding to Figure 5 of the embodiment of Figure 6.

[0023] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0024] Figure 1 is a front view of a helical compressor 1 according to one embodiment of the present invention, Figure 2 is a side view of the helical compressor 1 viewed from one end, Figure 3 is a cross-sectional view taken along line A-A in Figure 1, Figure 4 is an enlarged view of part B in Figure 3, and Figure 5 is a cross-sectional view taken along line C-C in Figure 2.

[0025] (1) Helical Compressor 1 The helical compressor 1 of this embodiment consists of a cylindrical metal cylinder 2, a fixing member 3, a cylindrical roller 4, a shaft 6, and a helical, flexible blade 7, etc. The helical compressor 1 of this embodiment is used, for example, in the refrigerant circuit of a car air conditioner, and sucks in a refrigerant (including oil) as a working fluid, compresses it, and discharges it.

[0026] (2) Cylinder 2 The cylinder 2 consists of a cylindrical cylinder body 11 with both ends open, and a pair of cylinder side plates 12, 13, etc. attached to both ends of the cylinder body 11 in the thrust direction (axial direction of the cylinder) by bolts 10, 20, and the inner surface of the cylinder body 11 has the shape of the inner surface of a cylinder. Of these, a bearing portion 14 made of a ball bearing is embedded in the center of the inner surface of one cylinder side plate 12, and a bearing portion 16 made of a ball bearing is also embedded in the center of the inner surface of the other cylinder side plate 13. The ends of the shaft 6 are rotatably supported in each of the bearing portions 14, 16.

[0027] One end of the shaft 6 protrudes outward from the cylinder side plate 12, and this protruding end of the shaft 6 (the left end in Figures 1 and 5) is connected to a motor (not shown), which rotates the shaft 6.

[0028] In Figure 5, 17 and 18 are annular gaskets that seal the joint between the cylinder body 11 and each cylinder side plate 12 and 13, and 19 is a sealing material that slidably seals the space between the shaft 6 and the cylinder side plate 12. These gaskets 17 and 18, along with the sealing material 19, etc., seal the roller 4, shaft 6, and blade 7 inside the cylinder 2.

[0029] Furthermore, an intake port 21 is formed at one end of the cylinder body 11 (left side in Figure 5), and a discharge port 22 is formed at the other end of the cylinder body 11 (right side in Figure 5). At this end of the cylinder body 11 (left side in Figure 5), that is, on the intake port 21 side (the side into which the refrigerant is drawn in: the intake side), a cylinder through-hole 23 is formed, extending radially and connecting the inside and outside of the cylinder body 11, as shown in an enlarged view in Figure 3.

[0030] Furthermore, an annular thrust plate 26 is attached to the inside of the cylinder side plate 12, and an annular thrust plate 27 is also attached to the inside of the cylinder side plate 13. The ends of the roller 4 are configured to slidably contact each of the thrust plates 26 and 27.

[0031] (3) Roller 4 The roller 4 has a cylindrical shape with both ends open, and cam bearing portions 28 and 29, each consisting of ball bearings, are attached to the inside of both ends. In addition, a plurality of circular recesses 31 are formed on one end face of the roller 4, and a pin 32 for preventing rotation, attached to the cylinder side plate 12, enters and engages with each recess 31. The pin 32 is slidably engaged with the circular inner surface of the recess 31, and these recesses 31 and pins 32 constitute the rotation prevention mechanism of the roller 4.

[0032] The roller 4 revolves around the cylinder 2 without rotating on its own due to the rotation of the shaft 6, thanks to the anti-rotation mechanism consisting of the recess 31 and the pin 32, and the action of the cams 33 and 34 of the shaft 6, which will be described later. At that time, the outer surface of the roller 4 slides against the inner surface of the cylinder 2 (line contact). Note that 36 is an annular sealing material that seals the space between the thrust plate 27 and the cylinder side plate 13.

[0033] The outer diameter of the roller 4 is set to be smaller than the inner diameter of the cylinder 2, thereby forming a compression chamber 37 for the refrigerant (working fluid) between the cylinder 2 and the roller 4. One end of this compression chamber 37 (the gap between the cylinder 2 and the rotor 4) (the cylinder side plate 12 side) is in communication with the intake port 21, and the other end (the cylinder side plate 13 side) is in communication with the discharge port 22.

[0034] Furthermore, spiral grooves 38 are continuously formed as recesses on the outer circumferential surface of the roller 4, extending from one end in the thrust direction (the intake port 21 side of the cylinder body 11 constituting the cylinder 2) to the other end (the discharge port 22 side of the cylinder body 11 constituting the cylinder 2), and the pitch of the spiral grooves 38 is set to gradually decrease from one end to the other.

[0035] (4) Blade 7 The blade 7 is designed to be deformable and is made of a flexible material such as PTFE. The blade 7 is fitted into the spiral groove 38 of the roller 4 so as to be able to protrude and retract, and slidably contacts the inner surface of the spiral groove 38, and also contacts the inner circumferential surface of the cylinder body 11 that constitutes the cylinder 2, thereby partitioning the compression chamber 37 formed between the cylinder 2 and the roller 4 in the thrust direction.

[0036] As described above, the pitch of the spiral groove 38 is set to gradually decrease from one end (the intake port 21 side of the cylinder body 11 that constitutes the cylinder 2) to the other end (the discharge port 22 side of the cylinder body 11 that constitutes the cylinder 2). Therefore, the volume of the compression chamber 37 partitioned by the blade 7 also gradually decreases from one end to the other.

[0037] Furthermore, at one end of the blade 7 at a position corresponding to the cylinder through-hole 23 of the cylinder body 11, a blade through-hole 41 is formed extending from the cylinder body 11 side to the roller 4 side, as shown in the enlarged view in Figure 3. That is, the cylinder through-hole 23 is located at a position corresponding to the blade through-hole 41. As a result, the blade through-hole 41 is located near the intake port 21 side (intake side) of the blade 7. Moreover, an expanded portion 42 is continuously formed at the opening of the blade through-hole 41 on the roller 4 side.

[0038] (5) Shaft 6 The shaft 6 passes through the roller 4, and both ends are rotatably supported by the bearing portions 14 and 16 of the cylinder side plates 12 and 13 as described above. The cams 33 and 34 described above are formed eccentrically in the same direction on the shaft 6 at positions corresponding to the cam bearing portions 28 and 29 of the roller 4, and each cam 33 and 34 slidably contacts the inner surface of each cam bearing portion 28 and 29 of the roller 4.

[0039] As a result, the roller 4 does not rotate on its own axis as the shaft 6 rotates, but instead revolves eccentrically around the cylinder 2. Note that 43 is a balancer formed on the shaft 6, eccentrically in the opposite direction to each of the cams 33 and 34.

[0040] (6) Fixing member 3 Here, as mentioned above, in the initial startup of the helical compressor 1, where the influence of frictional force is strong, when the blade 7 exits the spiral groove 38, the frictional force acts in a direction that causes the blade 7 to move away from the inner circumferential surface of the cylinder body 11 that constitutes the cylinder 2. In particular, on the intake port 21 side (intake side), where differential pressure is difficult to build up, the pressing force due to differential pressure is also small, so the blade 7 moves away from the inner circumferential surface of the cylinder body 11.

[0041] Further, when the blade 7 moves in the spiral direction, movement in the radial direction (radius direction) is allowed. For these reasons, the compression chamber 37 cannot be formed well, the desired compression ratio cannot be maintained, and the volumetric efficiency deteriorates.

[0042] Therefore, in the present invention, the fixing member 3 is attached to move the blade 7 in the spiral direction and press it against the inner peripheral surface of the cylinder body 11 (cylinder 2). Hereinafter, the fixing member 3 of this embodiment will be described with reference to FIGS. 3 to 5.

[0043] The fixing member 3 of this embodiment is composed of a bolt 46 and a nut 47 screwed to the tip thereof. In each figure, 48 is a washer disposed on the outer surface of the cylinder body 11. The bolt 46 is first inserted through the hole of the washer 48, then inserted through the cylinder through hole 23 formed in the cylinder body 11, and finally inserted through the blade through hole 41 of the blade 7.

[0044] Before the roller 4 is disposed in the cylinder 2, the blade 7 is disposed in the spiral groove 38. In the enlarged portion 42 of the blade through hole 41, the nut 47 is stored and held in advance before the blade 7 is disposed in the spiral groove 38 of the roller 4. At this time, the inner surface shape of the enlarged portion 42 is made to match the outer surface shape of the nut 47. Thereby, when the nut 47 enters the enlarged portion 42, the formed temperature sensor 47 engages with and is held by the blade 7.

[0045] Then, the tip of the bolt 46 that has entered the blade through hole 41 is screwed into the nut 47, and the nut 47 is screwed onto the bolt 46. In the figure, 49 is a sealing material for sealing between the bolt 46 and the cylinder body 11.

[0046] In this state, the head of the bolt 46 is in pressure contact with the washer 48, the nut 47 engages with the enlarged portion 42 and is in pressure contact with the bottom surface thereof. The bolt 46 is disposed substantially precisely in the blade through hole 41 and restricts the movement of the blade 7 in the spiral direction. Thereby, in this embodiment, the bolt 46 constitutes the restricting portion in the present invention.

[0047] Further, when the nut 47 engages with the expansion part 42 and presses against its bottom surface, the blade 7 is pressed against the inner peripheral surface of the cylinder body 11 that constitutes the cylinder 2. As a result, in this embodiment, the nut 47 constitutes the pressing part in the present invention, and due to its action, it becomes difficult for the blade 7 to separate from the inner peripheral surface of the cylinder body 11.

[0048] (7) Operation of the helical compressor 1 Next, the operation of the helical compressor 1 having the above configuration will be described. It is assumed that a predetermined amount of lubricating oil is pre-filled inside the helical compressor 1. When the shaft 6 rotates by the motor described above, the cams 33 and 34 also rotate. Therefore, due to the action of the cams 33 and 34 and the above-described anti-rotation mechanism (the recess 31 and the pin 32), the roller 4 revolves around the cylinder 2 without rotating relative to the cylinder 2.

[0049] The refrigerant (working fluid) is inhaled from the suction port 21 from an external refrigerant circuit and flows into the compression chamber 37 on one end side (the cylinder side plate 12 side). The refrigerant inhaled into the compression chamber  37 in this way is pushed by the roller 4 revolving while contacting the inner peripheral surface of the cylinder body 11 that constitutes the cylinder 2 and moves to the other end side (the cylinder side plate 13 side). However, as described above, the volume of the compression chamber 37 partitioned by the blade 7 gradually decreases from one end side to the other end side. Therefore, the refrigerant inhaled into the compression chamber 37 on the one end side is gradually compressed.

[0050] The refrigerant (including oil) compressed in this way is discharged to an external refrigerant circuit from the discharge port 22 located on the other end side. In this case, in the present invention, a regulating part (bolt 46 in the embodiment) for regulating the movement of the blade 7 in the spiral direction and a pressing part (nut 47 in the embodiment) for pressing the blade 7 against the inner peripheral surface of the cylinder body 11 (cylinder 2) are provided. Therefore, the regulating part can regulate the movement of the blade 7 in the spiral direction, and the pressing part can press the blade 7 against the inner peripheral surface of the cylinder body 11 (cylinder 2).

[0051] This eliminates or suppresses the inconvenience of the blade 7 separating from the inner surface of the cylinder body 11 (cylinder 2) due to frictional force during the initial startup phase, thereby forming a good compression chamber 37, maintaining the desired compression ratio, and efficiently compressing the refrigerant (working fluid).

[0052] Furthermore, in this embodiment, the restricting portion (bolt 46) and the pressing portion (nut 47) are provided near the end of the blade 7 on the intake port 21 side into which the refrigerant (working fluid) is drawn into the compression chamber 37. This effectively restricts the spiral movement of the blade 7 on the refrigerant intake side, where differential pressure is difficult to build up in the initial stages of startup, and also allows the blade 7 to be pressed against the inner circumferential surface of the cylinder body 11.

[0053] In this embodiment, a blade through-hole 41 is formed in the blade 7 from the cylinder 2 side to the roller 4 side, a cylinder through-hole 23 is formed in the cylinder body 11 at a position corresponding to the blade through-hole 41, an engaging portion (expanding portion 42) is provided on the roller 4 side of the blade through-hole 41, and a fixing member 3 is inserted from the cylinder 2 side through the cylinder through-hole 23 and the blade through-hole 41 and engaged with the engaging portion (expanding portion 42), thereby forming a restricting portion (bolt 46) and a pressing portion (nut 47). As a result, the fixing member 3 restricts the movement of the blade 7 in the helical direction and makes it possible to press the blade 7 against the inner circumferential surface of the cylinder body 11, thereby simplifying the structure.

[0054] In particular, in this embodiment, the engaging portion is composed of an expanding portion 42 located on the roller 4 side of the blade through hole 41, and the fixing member 3 is composed of a bolt 46 inserted from the cylinder 2 side through the cylinder through hole 23 and the blade through hole 41, and a nut 47 screwed onto the tip of the bolt 46. The bolt 46 acts as a restricting portion to restrict the spiral movement of the blade 7, and the nut 46 enters the expanding portion 42 and engages with the blade 7, so that the nut 46 acts as a pressing portion and presses the blade 7 against the inner circumferential surface of the cylinder body 11. Thus, the fixing member 3 can be simply constructed with the bolt 46 and nut 47, and the spiral movement of the blade 7 can be restricted and the blade 7 can be pressed against the inner circumferential surface of the cylinder body 11.

[0055] Furthermore, in this embodiment, the nut 47 is held within the expanded portion 42 of the blade through hole 41. By inserting the bolt 46 into the cylinder through hole 23 and the blade through hole 41 with the nut 47 positioned within the expanded portion 42 of the blade through hole 41, the bolt 46 can be easily screwed onto the nut 47, thereby improving assembly efficiency.

[0056] (8) Other embodiments of the fixing member 3 Next, other embodiments of the fixing member 3 attached to the helical compressor 1 shown in Figures 1 and 2 will be described with reference to Figures 6 to 8. In each figure, parts indicated by the same reference numerals as in Figures 1 to 5 are the same or perform the same function. Figure 6 is a cross-sectional view of the helical compressor 1 of this embodiment corresponding to Figure 3, Figure 7 is an enlarged view of part D in Figure 6, and Figure 8 is a cross-sectional view of the embodiment corresponding to Figure 5.

[0057] In this embodiment, the expanding portion 42 formed on the roller 4 side of the blade through hole 41 is shaped to gradually expand towards the roller 4 side. Furthermore, the fixing member 3 in this embodiment has a structure having a shaft portion 51 and two spring portions 52 provided at the tip of the shaft portion 51. Moreover, these spring portions 52 are constantly biased by elasticity in a direction in which their tips spread apart from each other.

[0058] First, the shaft portion 51 is inserted through the hole in the washer 48 with the tips of these spring portions 52 close together and closed. Next, it is inserted through the cylinder through hole 23 formed in the cylinder body 11, and finally through the blade through hole 41 of the blade 7.

[0059] At this time, each spring portion 52 enters the expanding portion 42, and its tip spreads apart from each other due to its own elasticity, pressing against and engaging with the inner surface of the expanding portion 42. In this state, the head of the shaft portion 51 presses against the washer 48 and is positioned almost tightly within the blade through hole 41, restricting the movement of the blade 7 in the helical direction. Thus, in this embodiment, the shaft portion 51 constitutes the restricting portion in the present invention.

[0060] Furthermore, the spring portion 52 engages with the expanding portion 42 and presses against its inner surface, thereby pressing the blade 7 against the inner circumferential surface of the cylinder body 11 that constitutes the cylinder 2. In this embodiment, the spring portion 52 constitutes the pressing portion in the present invention, and its action makes it difficult for the blade 7 to separate from the inner circumferential surface of the cylinder body 11.

[0061] As in this embodiment, the fixing member 3 is composed of a shaft portion 51 inserted from the cylinder 2 side through the cylinder through hole 23 and the blade through hole 41, and a spring portion 52 provided at the tip of the shaft portion 51 and constantly biased to expand by elasticity. The shaft portion 51 acts as a restricting portion to restrict the spiral movement of the blade 7, and the spring portion 52 expands at the expanding portion 42 and engages with the blade 7, so that the spring portion 52 becomes a pressing portion and presses the blade 7 against the inner circumferential surface of the cylinder body 11. By simply inserting the fixing member 3 into the cylinder through hole 23 and the blade through hole 41, the shaft portion 51 restricts the spiral movement of the blade 7, and the spring portion 52 expands to press the blade 7 against the inner circumferential surface of the cylinder body 11, thereby further improving the ease of assembly.

[0062] In this embodiment, the fixing member 3 is provided at the end of the blade 7 on the intake port 21 side, but it is not limited to this, and the movement of the blade 7 in the helical direction may be restricted and pressure applied to the inner circumferential surface of the cylinder body 11 may be applied at other locations.

[0063] Furthermore, although the present invention was applied to a helical compressor 1 used in the refrigerant circuit of a car air conditioner in the embodiment, the working fluid is not limited to the refrigerant in the embodiment; air or other gases may also be used, and the present invention is effective for helical compressors used for various purposes.

[0064] 1 Helical compressor 2 Cylinder 3 Fixing member 4 Roller 6 Shaft 7 Blade 11 Cylinder body 12, 13 Cylinder side plate 14, 16 Bearing section 21 Intake port 22 Discharge port 23 Cylinder through hole 28, 29 Cam bearing section 31 Recess 32 Pin 33, 34 Cam 37 Compression chamber 38 Helical groove 41 Blade through hole 42 Expanding section (engaging section) 46 Bolt (regulating section) 47 Nut (pressing section) 51 Shaft section (regulating section) 52 Spring section (pressing section)

Claims

1. A helical compressor comprising a cylinder, a roller disposed inside the cylinder and revolving relative to the cylinder, a helical blade that partitions a compression chamber formed between the cylinder and the roller, and a helical groove formed on the outer circumferential surface of the roller into which the blade can be inserted and retracted, wherein the volume of the compression chamber decreases as it progresses in the thrust direction of the cylinder due to the revolving of the roller, thereby compressing the working fluid drawn into the compression chamber, characterized in that the helical compressor comprises a restricting part that restricts the movement of the blade in the helical direction, and a pressing part that presses the blade against the inner circumferential surface of the cylinder.

2. The helical compressor according to claim 1, characterized in that the regulating portion and the pressing portion are provided near the end of the blade on the side in which the working fluid is drawn into the compression chamber.

3. The helical compressor according to claim 1, comprising a blade through hole formed in the blade from the cylinder side to the roller side, and a cylinder through hole formed in the cylinder at a position corresponding to the blade through hole, wherein the blade through hole has an engaging portion located on the roller side, and a fixing member inserted from the cylinder side through the cylinder through hole and the blade through hole engages with the engaging portion, thereby forming the regulating portion and the pressing portion.

4. The helical compressor according to claim 3, wherein the engaging portion is composed of an expanding portion located on the roller side of the blade through hole, the fixing member is composed of a bolt inserted from the cylinder side through the cylinder through hole and the blade through hole, and a nut screwed onto the tip of the bolt, the bolt acts as the restricting portion to restrict the movement of the blade in the helical direction, and the nut enters the expanding portion and engages with the blade, thereby the nut acts as the pressing portion and presses the blade against the inner circumferential surface of the cylinder.

5. The helical compressor according to claim 4, characterized in that the nut is held within the enlarged portion of the blade through hole.

6. The helical compressor according to claim 3, wherein the engaging portion is composed of an expanding portion located on the roller side of the blade through hole, the fixing member has a shaft portion inserted from the cylinder side through the cylinder through hole and the blade through hole, and a spring portion provided at the tip of the shaft portion and constantly biased in a direction that expands by elasticity, the shaft portion acts as the restricting portion to restrict the movement of the blade in the helical direction, and the spring portion expands at the expanding portion and engages with the blade, thereby the spring portion becoming the pressing portion and pressing the blade against the inner circumferential surface of the cylinder.

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