JPH04107494U - scroll fluid machine - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure the lubrication of the thrust plate when restarting the machine. [Structure] A drive shaft of an electric motor that is rotatably supported by a sealed case and has an oil passage inside which guides oil from an oil reservoir, a movable scroll member that is eccentrically connected to the drive shaft and rotates, and the movable scroll member. A scroll fluid machine comprising: a fixed scroll member that meshes with the movable scroll member to form a compression chamber; and a thrust plate fixed to the case via an Oldham ring on the back side of the movable scroll member. An oil supply path is provided, one end of which communicates with the oil passage and the other end of which opens at a location where the thrust plate slides into contact with the movable scroll member. A notch communicating with the notch, an annular communication groove communicating with the notch, and a plurality of oil grooves communicating with each other inside the communication groove and storing oil are provided.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is suitable for closed scroll fluid machines used in air conditioners, refrigeration equipment, etc. related.

0002

[Conventional technology]

Generally, in scroll fluid machines, the drive shaft of the electric motor has this drive shaft axis. The movable scroll member is connected eccentrically to the The crawl member rotates and forms a shape between it and the fixed scroll member fixed to the case. The refrigerant gas is compressed in a plurality of compression chambers.

0003 In addition, on the back side of the movable scroll member, there is a thrust plate fixed to the case. A plate is provided between the thrust plate and the movable scroll member. is fitted with an Oldham ring. And, movable scroll by Oldham ring This prevents the scroll member from rotating and allows the movable scroll member to rotate.

0004 Furthermore, an oil pump is generally installed at the lower end of the drive shaft. The pump absorbs oil from the oil reservoir and passes it through the oil passage provided in the drive shaft. The sliding contact parts of the thrust plate, Oldham ring, movable scroll member, etc. The structure is such that it is lubricated.

[0005]

[Problem that the idea aims to solve]

However, in conventional scroll members, oil is used only when mechanically driven. The structure was such that oil was supplied to each sliding contact part by the drive of a pump, so the machine When the machine stops operating, oil flows down from each sliding contact part into the oil pool, making it impossible for the machine to restart. There is a problem where the sliding contact part of the thrust plate lacks lubrication, especially during startup. There was a risk of damage to the machine.

[0006] In addition, we aim to reduce friction loss in the sliding contact area of the thrust plate and ensure complete lubrication. It is known that various types of grooves are provided in the sliding contact part of the thrust plate in order to For example, Japanese Patent Application Laid-Open No. 57-131893), as mentioned above, , When the machine stops operating, oil flows down from each sliding contact part into the oil reservoir. There is a high possibility that the machine will run out of lubricant when restarting, as described above.

[0007] Therefore, this invention ensures that the thrust plate is lubricated when restarting the machine. The purpose of the present invention is to provide a scroll fluid machine that enables this.

[0008]

[Means to solve the problem]

The scroll fluid machine of this invention is rotatably supported in a sealed case and has an oil inside. The drive shaft of the electric motor has an oil passage that guides oil from the oil reservoir, and a movable scroll member that is eccentrically connected and rotates; A fixed scroll member that engages with the movable scroll member to form a compression chamber, and a front There is a screw fixed to the case via an Oldham ring on the back side of the movable scroll member. A scroll fluid machine comprising a last plate, the movable scroll The member has one end communicating with the oil passage and the other end slidingly contacting the thrust plate. While providing an oil supply path that opens at the location where the movable thrust plate A notch communicating with the opening of the oil supply path is provided on the sliding surface with the crawling member. An annular communication groove that communicates with the notch of the The structure includes a plurality of oil grooves for storing oil.

[0009]

[Effect]

When the machine is driven, the movable scroll member is connected to the oil supply path from the oil passage. Oil is supplied to the sliding contact area with the thrust plate. Also, from the oil supply path The oil is absorbed by the notch formed in the sliding surface of the thrust plate with the movable scroll member. The oil is supplied from this notch to each oil groove via the communication groove. Collected in the groove.

0010 Therefore, when the machine is restarted, the sliding parts are immediately moistened by the oil in the oil groove. This prevents the lack of lubrication that occurs in the past. Ru. Also, when the movable scroll member rotates, it is constantly in contact with the oil supply path. Since the notch is provided, oil is reliably supplied to the oil groove.

[0011]

【Example】

Figure 1 shows a scroll fluid machine 1, and Figure 2 shows an enlarged view of its scroll part. In the figure, 2 is a sealed case, and this sealed case 2 has a cylindrical part 3 and upper and lower closures. It is formed by parts 4 and 5.

0012 A brushless DC motor 7 is arranged in the lower part of the case 2. sand That is, the drive shaft 8 of the electric motor 7 is arranged in the vertical direction of the case 2, and the upper part of the drive shaft 8 is , supported by a support block 11 fixed to the case 2 via bearings 9 and 10. Ru. A rotor 14 made of a laminated iron core is fixed to the lower end side of the drive shaft 8. A permanent magnet 15 is attached to the circumferential surface of the magnet 14, and the permanent magnet 15 has N poles and S poles arranged alternately. There is. Further, a cylindrical stator 16 is fixed to the case 2 around the permanent magnet 15. There is. This stator 16 is formed of a laminated iron core, and each salient pole portion of the stator 16 has an excitation Magnetic coils 17 are wound respectively, and the excitation coil 17 is connected to the case 2 through the lead wire. It is connected to a connector (not shown) attached to the

[0013] A suction union 20 is attached to the side of the case 2, and the union A suction pipe is connected to 20, and refrigerant gas is sucked into the case 2.

[0014] The upper end side of the drive shaft 8 has a center eccentric from the center of the drive shaft 8 by a predetermined dimension. A crankshaft 8a is integrally provided. This crankshaft 8a is a movable scroll The connecting insertion portion 23a, which is provided in a concave manner on the back surface of the roll member 23, is connected to the connecting insertion portion 23a through the bearing 24. Rotatably inserted.

[0015] On the back side of the movable scroll member 23, there is a stand fixed to the support block 11. A last plate 25 is arranged, and this thrust plate 25 and a movable scroll section An Oldham ring 26 is interposed between the material 23 and the material 23. Oldham ring 26 , is formed in an annular and plate shape, and has 18 in the circumferential direction on the surface on the movable scroll member 23 side. Engagement claws are provided protrudingly spaced apart by 0°, and these engagement claws engage the movable scroll member. It is slidably fitted into an engagement groove 27 (see FIG. 3) provided on the back surface of the material 23. . In addition, the surface of the Oldham ring 26 on the thrust plate 25 side is provided with the engaging pawl. On the other hand, engaging claws are provided protrudingly at positions shifted by 90 degrees, and these engaging claws It is slidably fitted into the engagement groove 28 (see FIG. 5) provided in the last plate 25. ing. Then, the Oldham ring 25, each engaging pawl, and each engaging groove 27, 28 Therefore, rotation of the movable scroll member 23 is prevented, and the crank is rotated as the drive shaft 8 rotates. The shaft 8a moves eccentrically, thereby driving the movable scroll member 23 to rotate.

[0016] The movable scroll member 23 is a fixed scroll member 30 fixed to the case 2. The scroll members 23 and 30 engage the suction pressure chamber 31 and the inside. An interpressure chamber 32 and a discharge pressure chamber 33 are formed. A thrust plate 25 is installed in the suction pressure chamber. and the suction port 34 provided in the support block 11 are communicated with each other, and the suction unit The refrigerant gas sucked from the ions 20 and 21 enters the suction pressure chamber 3 through the suction port 34. I am guided by 1. Further, the fixed scroll member 30 has a discharge port that communicates with the discharge pressure chamber 33. A port 35 is formed, and this discharge port 35 is connected via a reed valve 36. It communicates with the discharge union 37 fixedly installed in the case 2, and from the discharge union 37 coolant is supplied. A medium gas is discharged. In addition, in Figures 1 and 2, 38 is a balance weight, which is eccentric. Corresponding to the crankshaft 8a, it is provided to stabilize the rotational balance of the drive shaft 8. It is being

[0017] Further, an oil pump 40 is provided at the lower end of the drive shaft 8. 8 rotates, oil flows from the oil reservoir 41 into the drive shaft 8 along the axial direction. The oil is sucked up through the cut oil passage 42. The upper end of the oil passage 42 Gap 4 between the connecting insertion portion 23a of the movable scroll member 23 and the crankshaft 8a described above 3, and this gap 43 communicates with the four oils formed in the movable scroll member 23. It communicates with one end of the supply path 44 .

[0018] The oil supply path 44 communicates with a communication path 45, as shown in FIGS. 3 and 4. It is composed of a hole 46. The communication path 45 is located inside the movable scroll member 23. It is formed in the radial direction so as not to interfere with the engagement groove 27, and the other end is closed by a blind plug 47. It's blocked. Each communication hole 46 communicates with each communication path 45 and is connected to the movable scroll portion. The opening is made at the place where the material 23 comes into sliding contact with the thrust plate 25 on the back side. It is provided.

[0019] On the other hand, on the upper surface of the thrust plate 25 that comes into sliding contact with the movable scroll member 23, As shown in FIGS. 5 and 6, a large number of oil grooves 50 are arranged at approximately equal intervals in the circumferential direction. (for example, every 15 degrees). Each of these oil grooves 50 is shown in FIG. It is provided along the rotating direction of the movable scroll member 23 as shown by the arrow. Ru. In this embodiment, as shown in FIG. It is formed at an angle of °. In addition, the inner end side of each oil groove 50 is formed into a dead end. On the other hand, the outer end side is communicated with an annular communication groove 51. In addition, the above movable screen A notch 52 is formed in the roll member 23 at a location corresponding to each communication hole 46. Ru. This notch 52 is formed by the movable scroll member 23 as it rotates. A predetermined area is provided so as to be able to constantly communicate with each communication hole 46, which rotates in a predetermined manner. It is prepared and formed.

[0020] In such a scroll fluid machine 1, when the machine is driven, the rotation of the drive shaft 8 is Accordingly, the oil pump 40 operates, and oil flows from the oil reservoir 41 to the oil passage 4. It is taken up by 2. The oil in the oil passage 42 is removed from the gap 4 in the connecting insertion part 23a. 3 to each communication path 45 of the oil supply path 44. Furthermore, each communication path 45 The oil inside is supplied to the notch 52 of the thrust plate 25 through each communication hole 46. The oil is supplied from the notch 52 to the communication groove 51 and each oil groove 50, and oil is supplied to these. il is accumulated. Then, it overflows from the notch 52, the communication groove 51, and the oil groove 50. The movable scroll member 23, thrust plate 25, Oldhamlin Lubrication of each sliding contact portion between the plugs 26 and the like is performed. In this case, the swing range of the communication hole 46 A notch 52 is provided in an area that is always in communication with the oil flow. Therefore, each sliding contact portion can be reliably lubricated. Also, each o Since oil accumulates in the oil groove 50, when restarting the machine, the oil in the oil groove 50 must be removed. It becomes possible to perform lubrication more immediately.

[0021]

[Effect of the idea]

As explained above, according to the present invention, the sliding member slidingly contacts the movable scroll member. An oil groove is provided on the top surface of the top plate to prevent oil from being supplied to these sliding parts. Since the oil is collected in the oil groove, when the machine is restarted, the oil in the oil groove will ensure This makes it possible to lubricate the entire body, preventing the situation of insufficient lubrication as in the past. I can do it.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a scroll fluid machine.

FIG. 2 is a longitudinal sectional view showing an enlarged scroll portion in FIG. 1;

FIG. 3 is a sectional view taken along the line II-II in FIG. 4 showing the movable scroll member.

FIG. 4 is a view taken along arrow III in FIG. 3, showing the movable scroll member.

FIG. 5 is a plan view of the thrust plate.

6 is a sectional view taken along the line V-V in FIG. 5. FIG.

FIG. 7 is an enlarged plan view of an oil groove.

[Explanation of symbols]

1 Scroll fluid machine 2 cases 7 Electric motor 8 Drive shaft 23 Movable scroll member 25 Thrust plate 26 Oldham Ring 30 Fixed scroll member 41 Oil reservoir 42 Oil passage 44 Oil supply path 50 Oil groove 51 Communication groove 52 Notch groove

Claims (1)

[Scope of utility model registration request] 1. A drive shaft of an electric motor rotatably supported by a sealed case and having an oil passage therein for guiding oil from an oil reservoir; a movable scroll member eccentrically connected to the drive shaft and rotating; and the case. A scroll fluid machine comprising: a fixed scroll member that is fixed to the movable scroll member and meshes with the movable scroll member to form a compression chamber; and a thrust plate that is fixed to the case via an Oldham ring on the back side of the movable scroll member. The movable scroll member is provided with an oil supply path that communicates with the oil passage at one end and opens at a location where the other end comes into sliding contact with the thrust plate, while a sliding surface of the thrust plate with the movable scroll member, A cutout portion communicating with the opening of the oil supply path, an annular communication groove communicating with the cutout portion, and a plurality of oil grooves communicating with each other inside the communication groove and storing oil are provided. A scroll fluid machine featuring: