Scroll-type fluid machine

Abstract

Provided is a scroll-type fluid machine that can improve workability of a connection between a discharge tube and a discharge pipe or joint of a fixed scroll member.　A scroll-type compressor comprises: a fixed scroll member (11) having an end plate (17), a wrap (18), cooling fins (19), and a discharge tube (20); an orbiting scroll member (12) having an end plate (25) and a wrap (26); a drive shaft (13) that causes the orbiting scroll member (12) to orbit relative to the fixed scroll member (11); and a fixed cover (24) that is attached to a distal end side of the cooling fins (19) of the fixed scroll member (11). The discharge tube (20) of the fixed scroll member (11) extends from the end plate (17) of the fixed scroll member (11) to beyond the inner surface of the fixed cover (24).

Description

Scroll-type fluid machinery

[0001] The present invention relates to a scroll-type fluid machine.

[0002] Patent Document 1 discloses a scroll compressor, which is a type of scroll-type fluid machine. This scroll compressor includes a fixed scroll member, an orbiting scroll member, and a drive shaft that orbits the orbiting scroll member relative to the fixed scroll member. The fixed scroll member has an end plate and a spiral wrap that is integrally molded with the end plate and stands on one side of the end plate. The orbiting scroll member has an end plate and a spiral wrap that is integrally molded with the end plate and stands on one side of the end plate so as to face the fixed scroll member.

[0003] A plurality of working chambers are formed between the wraps of the fixed scroll member and the orbiting scroll member. As the orbiting scroll member orbits, the working chambers move and their volumes decrease, thereby compressing the gas.

[0004] The fixed scroll member further includes a discharge tube that is integrally molded with the end plate and stands on the opposite side of the end plate. The discharge tube of the fixed scroll member has, for example, a female thread that screws into a male thread of a discharge pipe, and is connected to the discharge pipe. The discharge tube of the fixed scroll member and the discharge pipe connected thereto discharge the gas compressed by the working chamber.

[0005] The fixed scroll member further includes a plurality of cooling fins integrally formed with the end plate and erected on the opposite side of the end plate. A fixed cover is attached to the tips of the cooling fins, and cooling air flows through a flow path formed by the cooling fins and the fixed cover, thereby cooling the fixed scroll member.

[0006] Japanese Patent Application Laid-Open No. 2006-017013

[0007] The discharge tube of the fixed scroll member in Patent Document 1 is lower than the cooling fins arranged around it and does not extend to or beyond the inner surface of the fixed cover. Therefore, unless the fixed cover is removed, the connection state between the discharge tube of the fixed scroll member and the discharge pipe cannot be visually confirmed, and the work of connecting them is not easy. As the need for labor saving increases, a structure that is easier to maintain is required.

[0008] The present invention has been made in view of the above circumstances, and one of its objects is to improve the workability of connecting the discharge cylinder of the fixed scroll member to the discharge pipe or joint.

[0009] The present invention includes a plurality of means for solving the above-mentioned problems, and examples thereof include a fixed scroll member having an end plate, a spiral wrap integrally formed with the end plate and erected on one side of the end plate, and a plurality of cooling fins integrally formed with the end plate and erected on the opposite side of the end plate, a revolving scroll member having an end plate and a spiral wrap integrally formed with the end plate and erected on one side of the end plate so as to face the fixed scroll member, a drive shaft for revolving the revolving scroll member relative to the fixed scroll member, and a drive shaft for rotating the fixed scroll member relative to the fixed scroll member. In a scroll-type fluid machine having a fixed cover attached to the tip side of the plurality of cooling fins of a member, and changing the pressure of a gas by a plurality of working chambers formed between the wrap of the fixed scroll member and the wrap of the orbiting scroll member, the fixed scroll member further has a discharge tube that is integrally molded with the end plate and erected on the opposite side of the end plate, and discharges the gas whose pressure has been changed by the working chambers, and the discharge tube of the fixed scroll member extends from the end plate of the fixed scroll member to or beyond the inner surface of the fixed cover.

[0010] According to the present invention, the workability of connecting the discharge cylinder of the fixed scroll member to the discharge pipe or the joint can be improved.

[0011] Problems, configurations, and effects other than those described above will become clear from the following description.

[0012] 1 is a side view showing the structure of a scroll compressor in a first embodiment to which the present invention is applied; 2 is a cross-sectional view showing the structure of a scroll compressor in a first embodiment to which the present invention is applied; 3 is a side view showing the structure of a fixed scroll member and a fixed cover in a first embodiment to which the present invention is applied; 4 is a rear view showing the structure of a fixed scroll member in a first embodiment to which the present invention is applied; 5 is a side view showing the structure of a fixed scroll member and a fixed cover in a second embodiment to which the present invention is applied; 6 is a rear view showing the structure of a fixed scroll member in a second embodiment to which the present invention is applied; 7 is a partially enlarged cross-sectional view showing the structure of a fixed scroll member and a fixed cover in a second embodiment to which the present invention is applied;

[0013] A first embodiment to which the present invention is applied will be described with reference to FIGS.

[0014] Fig. 1 is a side view showing the structure of a scroll compressor according to this embodiment. Fig. 2 is a cross-sectional view showing the structure of the scroll compressor according to this embodiment. Fig. 3 is a side view showing the structure of a fixed scroll member and a fixed cover according to this embodiment. Fig. 4 is a rear view showing the structure of the fixed scroll member according to this embodiment, with the fixed cover removed.

[0015] The scroll compressor of this embodiment includes a casing 10, a fixed scroll member 11, an orbiting scroll member 12, a drive shaft 13, a cooling fan 14, and a duct 15. The fixed scroll member 11 is connected to the open side of the casing 10 (the right side in FIGS. 1 and 2 ). The orbiting scroll member 12 is housed within the casing 10. The drive shaft 13 is rotatably supported by a bearing 16 within the casing 10. The cooling fan 14 rotates together with the drive shaft 13 to generate cooling air. The duct 15, only a portion of which is shown, guides the cooling air generated by the cooling fan 14.

[0016] The fixed scroll member 11 has a substantially circular end plate 17, a spiral wrap 18 standing on one side of the end plate 17 (the left side in FIGS. 1 and 2), and a plurality of cooling fins 19 and a discharge tube 20 standing on the opposite side of the end plate 17 (the right side in FIGS. 1 to 3). The fixed scroll member 11 is a casting made of, for example, an aluminum alloy, and the end plate 17, wrap 18, cooling fins 19, and discharge tube 20 are integrally molded.

[0017] An intake passage 21 is formed in the radially outer portion of the end plate 17 of the fixed scroll member 11, and an intake filter 22 is connected to the intake passage 21. A communication hole that communicates with the interior of the discharge cylinder 20 is formed in the radial center of the end plate 17 of the fixed scroll member 11. The discharge cylinder 20 of the fixed scroll member 11 and the discharge pipe 23, which is made of, for example, an iron alloy, are threadedly engaged with each other to connect the discharge cylinder 20 of the fixed scroll member 11 and the discharge pipe 23.

[0018] A fixed cover 24 is attached to the tip side of the cooling fins 19 of the fixed scroll member 11, and cooling air from the duct 15 flows through a flow path formed by the cooling fins 19 and the fixed cover 24. This cools the fixed scroll member 11.

[0019] The orbiting scroll member 12 has a substantially circular end plate 25, a spiral wrap 26 erected on one surface of the end plate 25 (the right side in FIGS. 1 and 2) so as to face the fixed scroll member 11, and a plurality of cooling fins 27 erected on the opposite surface of the end plate 25 (the left side in FIGS. 1 and 2). The orbiting scroll member 12 is a casting made of, for example, an aluminum alloy, and the end plate 25, wrap 26, and cooling fins 27 are integrally molded.

[0020] A plate 28 is attached to the tip side of the cooling fins 27 of the orbiting scroll member 12, and cooling air from the duct 15 flows through a flow path formed by the cooling fins 27 and the plate 28. This cools the orbiting scroll member 12.

[0021] A crank portion 29 is provided on one end side (the right side in FIGS. 1 and 2) of the drive shaft 13. The crank portion 29 is eccentric from the center of the drive shaft 13 and is connected to the boss portion of the plate 28 via a slewing bearing 30.

[0022] The other end of the drive shaft 13 (left side in FIGS. 1 and 2) protrudes outside the casing 10 and is provided with a pulley 31. A belt (not shown) is stretched between the pulley (not shown) provided on the rotating shaft (not shown) of the electric motor and the pulley 31. As a result, the rotational force of the electric motor is transmitted to rotate the drive shaft 13, causing the orbiting scroll member 12 to orbit relative to the fixed scroll member 11. A rotation prevention mechanism for preventing the orbiting scroll member 12 from rotating on its own axis is provided within the casing 10.

[0023] A plurality of working chambers are formed between the wraps 18 of the fixed scroll member 11 and the wraps 26 of the orbiting scroll member 12. As the orbiting scroll member 12 orbits, each working chamber moves from the outside to the inside in the wrap extension direction (in other words, toward the radial center of the fixed scroll member 11) and sequentially performs a suction process, a compression process, and a discharge process. The working chamber during the suction process draws in gas (e.g., air) through the suction passage 21 and suction filter 22 of the fixed scroll member 11. The working chamber during the compression process compresses the gas (in other words, changes the pressure of the gas). The working chamber during the discharge process discharges compressed gas (in other words, gas with a changed pressure) through the discharge cylinder 20 and discharge pipe 23 of the fixed scroll member 11.

[0024] A feature of this embodiment is that the discharge tube 20 of the fixed scroll member 11 extends from the end plate 17 of the fixed scroll member 11 past the inner surface (and outer surface) of the fixed cover 24. This makes it possible to visually check the connection state between the discharge tube 20 of the fixed scroll member 11 and the discharge pipe 23 without removing the fixed cover 24, and also makes it easy to connect them. As a result, poor connection between the discharge tube 20 of the fixed scroll member 11 and the discharge pipe 23 and damage to the discharge tube 20 of the fixed scroll member 11 can be prevented.

[0025] Furthermore, if the discharge tube 20 of the fixed scroll member 11 has a higher thermal conductivity than the discharge pipe 23, the compressed air immediately after being discharged from the communication hole in the end plate 17 of the fixed scroll member 11 can be cooled more efficiently by cooling air than when the discharge tube 20 of the fixed scroll member 11 does not extend to the fixed cover 24 (in other words, when part of the discharge pipe 23 is inside the fixed cover 24).

[0026] In the first embodiment, the discharge tube 20 of the fixed scroll member 11 and the discharge pipe 23 are directly connected. However, this is not limiting. For example, as shown in FIG. 5 (described later), the discharge tube 20 of the fixed scroll member 11 and the discharge pipe may be connected via a joint 32. More specifically, for example, a discharge pipe (not shown) is connected to one side of the joint 32 (the right side in FIG. 5 ). Then, for example, a wrench holding the joint 32 is used to thread the male threaded portion of the other side of the joint 32 (the left side in FIG. 5 ) into the female threaded portion of the discharge tube 20. This allows the discharge pipe to be connected without damaging the discharge pipe, unlike when a pipe wrench is used to hold the discharge pipe. Furthermore, whereas a pipe wrench is difficult to handle and reduces operability, the use of an easy-to-use wrench for connection improves operability.

[0027] A second embodiment to which the present invention is applied will be described with reference to Figures 5 to 7. In this embodiment, parts equivalent to those in the first embodiment are given the same reference numerals, and descriptions thereof will be omitted where appropriate.

[0028] Fig. 5 is a side view showing the structure of the fixed scroll member and the fixed cover in this embodiment, Fig. 6 is a rear view showing the structure of the fixed scroll member in this embodiment with the fixed cover removed, and Fig. 7 is a partially enlarged cross-sectional view showing the structure of the fixed scroll member and the fixed cover in this embodiment.

[0029] As in the first embodiment, the discharge tube 20 of the fixed scroll member 11 extends from the end plate 17 of the fixed scroll member 11 past the inner surface (and outer surface) of the fixed cover 24. This makes it possible to visually check the connection between the discharge tube 20 of the fixed scroll member 11 and the joint 32 without removing the fixed cover 24, and also makes it easy to connect them. As a result, poor connection between the discharge tube 20 of the fixed scroll member 11 and the joint 32 and damage to the discharge tube 20 of the fixed scroll member 11 can be prevented.

[0030] The fixed scroll member 11 further has a plurality of (six in this embodiment) ribs 33 formed on the outer periphery of the discharge tube 20 and extending in the axial direction of the discharge tube 20 so as to form a gap between the fixed cover 24 and the fixed scroll member 11. This increases the strength of the discharge tube 20 of the fixed scroll member 11. In addition, since the heat transfer area is increased, the compressed air immediately after discharge can be cooled more efficiently by cooling air.

[0031] An annular seal member 34 is disposed in the gap between the fixed cover 24 and the plurality of ribs 33 and on the outer periphery of the discharge tube 20. The seal member 34 closes a through hole 35 in the fixed cover 24 through which the discharge tube 20 of the fixed scroll member 11 passes, thereby preventing leakage of cooling air from the through hole 35. This ensures the cooling performance of the fixed scroll member 11.

[0032] In the first and second embodiments, the discharge tube 20 of the fixed scroll 11 extends from the end plate 17 of the fixed scroll 11 past the inner surface (and outer surface) of the fixed cover 24, but this is not limiting. The discharge tube 20 of the fixed scroll 11 may extend from the end plate 17 of the fixed scroll 11 to the inner surface of the fixed cover 24 (in other words, it does not have to extend beyond the inner surface of the fixed cover 24). Alternatively, the discharge tube 20 of the fixed scroll 11 may extend from the end plate 17 of the fixed scroll 11 to the outer surface of the fixed cover 24 (in other words, it does not have to extend beyond the outer surface of the fixed cover 24). These modifications also provide substantially the same effects as the above-described embodiments.

[0033] Although the present invention has been described above as being applied to a scroll compressor, which is one type of scroll fluid machine, the present invention is not limited to this and may be applied to other scroll fluid machines (specifically, scroll vacuum pumps, scroll expanders, etc.).

[0034] 11... Fixed scroll member, 12... Orbiting scroll member, 13... Drive shaft, 17... End plate, 18... Wrap, 19... Cooling fin, 20... Discharge tube, 23... Discharge pipe, 24... Fixed cover, 25... End plate, 26... Wrap, 32... Joint, 33... Rib, 34... Sealing member

Claims

1. a fixed scroll member having a head, a spiral wrap formed integrally with the head and erected on one side of the head, and a plurality of cooling fins formed integrally with the head and erected on an opposite side of the head, the cooling fins extending in one direction; a rotating scroll member having an end plate and a spiral wrap formed integrally with the end plate and standing on one side of the end plate so as to face the fixed scroll member; a drive shaft for orbiting the orbiting scroll member relative to the fixed scroll member; a fixed cover attached to a tip side of the plurality of cooling fins of the fixed scroll member, A scroll-type fluid machine in which a pressure of a gas is changed by a plurality of working chambers formed between the wrap of the fixed scroll member and the wrap of the orbiting scroll member, the fixed scroll member further includes a discharge cylinder that is integrally formed with the end plate and stands on the opposite surface side of the end plate, and that discharges the gas whose pressure has been changed by the working chamber, The discharge tube of the fixed scroll member extends from the end plate of the fixed scroll member to or beyond the inner surface of the fixed cover, The fixed scroll member further includes a plurality of ribs formed on an outer circumferential side of the discharge tube and extending in an axial direction of the discharge tube so as to form a gap between the fixed cover and the discharge tube, The scroll type fluid machine, wherein the plurality of ribs extend radially from the discharge tube.

2. 2. The scroll type fluid machine according to claim 1, a scroll-type fluid machine, characterized in that an annular seal member is disposed in a gap between the fixed cover and the plurality of ribs and on an outer circumferential side of the discharge cylinder.

3. In the scroll type fluid machine according to claim 1, The scroll type fluid machine, wherein the plurality of cooling fins include a cooling fin having a portion formed lower than other portions and contacting the rib.

4. In the scroll type fluid machine according to claim 3, The scroll type fluid machine, wherein the plurality of ribs include a rib that does not contact the cooling fins.