JPH0742953B2 - Scroll type fluid machinery - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll fluid machine, and more particularly to a scroll fluid machine that requires a clean working fluid.

[Conventional technology]

FIG. 1 shows a conventional scroll fluid machine. In the case of an air compressor, a fixed scroll member 1 and an orbiting scroll member 2
The temperature of the closed space formed by and becomes high due to the heat generated by the compression of the gas. For example, suction temperature 20
When adiabatic compression is performed under conditions of ℃ and discharge pressure of 7 kg / cm ² g, without cooling, the maximum temperature reaches about 250 ℃. And
The heat in this closed space is transmitted to the fixed scroll member 1 and the orbiting scroll member 2, and the temperature of the inner wall of the suction chamber 13 also rises. As a result, the working fluid in the suction chamber 13 is heated, which causes the temperature level of the working fluid in the high temperature portion to further rise.

Further, not only is the inner wall of the suction chamber 13 heated, but the working fluid in the suction chamber 13 is also heated when the high-temperature working fluid leaks from the high-pressure side sealed space into the suction chamber 13. In this way, when the working fluid in the suction chamber 13 is heated,
The volumetric efficiency decreases at a rate of 2 to 3% for a heating degree of 10 ° C. Therefore, lowering the temperature in the suction chamber 13 is extremely important in terms of improving performance.

When the working fluid is heated from the inner wall of the suction chamber 13 described above,
Japanese Patent Laid-Open No. 58-10178 discloses a conventional method for dealing with this. This example is shown in FIGS. 2 and 3. In the air compressor, the air suction pipe 22 is connected to the suction hole of the compressor body through the heat insulating material 21 to prevent the temperature rise of the working fluid. Further, in Japanese Utility Model Laid-Open No. 58-146895, a multi-blade fan provided in the fan chamber 5 sucks external air from an intake port into the crank chamber to constantly recirculate the air, thereby causing the back surface of the orbiting scroll, the inside of the casing, and the bearings to rotate. There is disclosed a scroll compressor adapted to cool a compressor.

[Problems to be Solved by the Invention]

The one described in Japanese Patent Laid-Open No. 58-10178 has no effect on the high-temperature working fluid leaking from the above-mentioned closed space on the high pressure side to the suction chamber 13.

Further, the one described in Japanese Utility Model Laid-Open No. SHO 58-146895 is a device in which an intake port is branched into a suction chamber side and a suction port side, and it is not considered to suppress the rise of the suction temperature. Met.

The object of the present invention is to solve the above-mentioned problems of the prior art,
Prevents temperature rise of the working fluid inside the suction chamber of fluid machinery,
(EN) Provided is a scroll type fluid machine capable of improving volumetric efficiency and lowering a gas temperature in a compression stroke, and reducing a discharge temperature and a fluid machine as a whole, that is, a temperature level of a scroll member, a bearing and the like.

[Means for Solving the Problems]

In order to achieve the above object, the scroll fluid machine of the present invention includes an involute or a fixed scroll member having a wrap formed by a curve formed by a combination of arcs, and an orbiting scroll member are engaged with each other to prevent the orbiting scroll member from rotating. In a scroll type fluid machine that is swirled while moving to move a sealed space formed by the fixed and swiveling scroll members to move a fluid in the closed space, a suction chamber provided in the fixed scroll, and the suction chamber. Means for forcibly supercharging the working fluid in excess of the circulation flow rate peculiar to the fluid machine to the chamber, and a fluid passage communicating between the suction chamber provided in the fixed scroll and the space provided in the back chamber of the orbiting scroll. And a part of the working fluid supercharged by the supercharging means from the suction chamber to the space. Transfer to, and is characterized in that it has formed so as to discharge or circulate.

[Action]

The working fluid inside the suction chamber is heated by the high-temperature and high-pressure working fluid leaking from the working chamber, and is heated by the heat transfer and heat conduction from the inner wall of the suction chamber. As it rises and expands, the actual circulation flow rate is lower than the circulation flow rate at the temperature before suction. In other words, apparently the volumetric efficiency has decreased. Also,
Since the suction temperature has risen, for example, in the case of a compressor, the discharge temperature also rises, and the temperature level of the entire fluid machine rises, which causes a decrease in reliability.

With the above configuration, the working fluid is supplied to the suction chamber in excess of the circulation flow rate specific to the fluid machine, and the high-temperature, high-pressure working fluid leaking from the working chamber is introduced into the suction chamber, It is possible to carry away the amount of heat transmitted to the outside with the working fluid supplied in excess.

Therefore, the temperature of the working fluid in the suction chamber can be lowered, and as a result, the temperature level of the entire fluid machine can be lowered. As a result, the fluid machine can be operated in an ideal state, and reliability and efficiency can be improved.

〔Example〕

An embodiment in which the present invention is applied to a scroll compressor will be described below with reference to the drawings. FIG. 4 shows an embodiment of a scroll type compressor according to the present invention, where 1 is a fixed scroll and 2 is a fixed scroll.
Indicates an orbiting scroll. The fixed scroll 1
Has an upright standing spiral wrap 1-b having a substantially constant thickness on one surface of the end plate 1-a, and an annular housing 20 provided so as to cover the spiral wrap 1-b. Further, a discharge hole 7 for discharging the compressed gas is formed substantially in the center of the end plate 1-a, and a suction hole 6 for sucking the suction gas is formed in the outer periphery of the annular housing 20. The orbiting scroll 2 includes an end plate 2
A spiral wrap 2-b having a substantially constant thickness is erected on one surface of -a. And both scrolls 1 and 2 are 1
They are offset by 80 degrees and are combined with each other with wraps 1-b and 2-b facing inward. Reference numeral 3 is a crankshaft for revolving the orbiting scroll 2, and the crankshaft 3 is supported by an orbiting bearing 10 provided on a boss 9 of the orbiting scroll 2 and a bearing 8 provided on a frame 4 integrated with the fixed scroll 1. ing. Reference numeral 5 is a balance weight attached to the crankshaft 3, and 12 is a rotation preventing mechanism of the orbiting scroll 2, which is locked between the orbiting scroll 2 and the frame 4.

In the figure, 14 is a suction chamber 13 formed inside the annular housing 20.
The working fluid supercharged to the orbiting scroll 2 and the frame 4
It is a passage means that leads to the space formed by. In the case of this embodiment, a fan 15 (also referred to as a transfer means) connected to the crankshaft 3 is incorporated inside the frame 4, and the suction chamber 13
The supercharged working fluid is introduced into the frame 4 through the passage means 14 and discharged to the outside through the discharge hole 16.

The inner wall of the suction chamber 13 is cooled by the working fluid, and the excess working fluid that has deprived the heat in the suction chamber 13 is constantly sucked out by the fan 15. Therefore, in the suction chamber 13,
When supercharged, there will be a working fluid close in temperature. When the working fluid is heated in the suction chamber 13 and the temperature rises by 20 ° C., the volume efficiency is reduced by several percent, so that it is possible to surely improve the performance by cooling the suction chamber 13 described above. Become.

FIG. 5 shows another embodiment of the present invention, which is different from FIG. 4 in that the working fluid passage 14 is provided in the orbiting scroll 2 of the frame 4.
It is a point formed on the end support portion of the end plate of. According to this embodiment, the manufacture is easier than that of the embodiment of FIG.

FIG. 6 also shows another embodiment of the present invention, which is different from FIG. 4 in that the working fluid circulation path is constituted by a closed loop and an external working fluid supply source 17 is provided. Where frame 4
The bearing housing is composed of the end plate having the auxiliary bearing 11. According to this embodiment, since the circulation path of the working fluid is constituted by the closed loop, it is possible to make the compressor semi-hermetic. Further, if the working fluid is supercharged in the atmosphere open state, there is a possibility that dust in the atmosphere will be sucked into the compressor, and this embodiment enables not only the semi-hermetic type compressor but also the internal cleaning. Become. The excess working fluid that circulates is cooled by the external cooling means 18 provided in the external circulation system passage.
The temperature of the supercharging working fluid can be kept constant at all times. Further, in FIG. 6, by incorporating a motor inside the frame 4, it is possible to make the compressor completely enclosed. In this case, the inside of the bearing housing is also called a motor chamber.

Further, in FIG. 6, the temperature of the working fluid in the suction chamber 13 can be adjusted by controlling the temperature of the excess working fluid supplied to the suction chamber 13 by adjusting the cooling amount of the external cooling means 18. As a result, a predetermined cooling effect can be obtained with a small amount and an excessive amount of working fluid.

FIG. 7 also shows another embodiment of the present invention, which differs from FIG. 4 in that the working fluid is supercharged by the external cooling fan 19. According to this embodiment, the main body can be made compact, and since it is an external fan,
By adjusting the supercharging amount of the working fluid, it is possible to adjust the cooling amount according to the ambient temperature of the suction chamber 13.

The above embodiment does not show an example in which a filter is provided at the inlet of the working fluid, but in order to clean the working fluid and the supercharged working fluid, the working fluid after passing through the filter is sent to the suction chamber. It is good to introduce.

〔The invention's effect〕

As described above, according to the present invention, the working chamber is forcibly supercharged with an excess working fluid than the circulation flow rate peculiar to the fluid machine, and a part of the supercharged working fluid is partially discharged from the suction chamber. Since it is transferred to the space, the temperature rise of the working fluid in the suction chamber can be prevented and the temperature of the entire fluid machine can be lowered, so that the performance and reliability can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll compressor shown as a conventional example, FIG. 2 is a plan view of a scroll wrap, and FIG. 3 is an enlarged sectional view of a suction portion of a scroll compressor shown as a conventional example, FIG. Is a longitudinal sectional view of the first embodiment of the present invention, FIG. 5 is an enlarged sectional view of an essential part of the second embodiment of the present invention, and FIG. 6 is an essential part of the third embodiment of the present invention. FIG. 7 is an enlarged sectional view, and FIG. 7 is a longitudinal sectional view of a fourth embodiment of the present invention. 1 ... Fixed scroll, 1a ... Fixed end plate, 1b ... Fixed spiral wrap, 2 ... Orbiting scroll, 2a ... Orbiting end plate, 2b ... Orbiting spiral wrap, 3 ... Crankshaft, Four
…… Frame, 5 …… Balance weight, 6 …… Suction hole, 7 …… Discharge hole, 8 …… Main bearing, 9 …… Swirl scroll boss, 10 …… Swirl bearing, 11 …… Auxiliary bearing, 12… … Rotation prevention mechanism, 13 …… Suction chamber, 14 …… Cooling fluid passage, 15…
… Fan, 16 …… Cooling fluid discharge hole, 17 …… External cooling fluid supply source, 18 …… External cooling means, 19 …… External fan, 20…
… Annular housing, 21… Insulation, 22… Air suction pipe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masato Ikegawa, Masato Ikegawa 502 Jinritsu-cho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hiritsu Manufacturing Co., Ltd. (56) References

Claims (7)

[Claims] 1. A fixed scroll member having a wrap formed by a curve formed by a combination of involutes or arcs and an orbiting scroll member are engaged with each other, and the orbiting scroll member is caused to perform an orbiting motion while preventing rotation thereof, and both the fixed and orbiting members are rotated. In a scroll type fluid machine that moves a closed space formed by a scroll member and moves a fluid in the closed space, a suction chamber provided in the fixed scroll and an excess flow rate to the suction chamber that is greater than a circulation flow rate specific to the fluid machine. A means for forcibly supercharging the working fluid, a fluid passage communicating the suction chamber provided in the fixed scroll with a space provided in the back chamber of the orbiting scroll are provided, and A part of the supplied working fluid is transferred from the suction chamber to the space and discharged or circulated. Scroll fluid machine, characterized in that the. 2. The scroll type fluid machine according to claim 1, wherein the fluid passage is formed in a surface of the end plate of the orbiting scroll opposite to the wrap side. 3. The scroll type fluid machine according to claim 1, wherein the fluid passage is formed in an end supporting portion of an end plate of the orbiting scroll of the frame. 4. A working fluid sucked into a suction chamber of a fluid machine is guided from a fluid passage from the suction chamber into a bearing housing (motor chamber) of the fluid machine, and further, a fluid outside the fluid machine having a cooling means. The scroll type fluid machine according to claim 1, wherein the fluid is sucked into the suction chamber again through the passage. 5. A fan, wherein the supercharging means is provided inside a fluid machine and is connected to a drive shaft of an orbiting scroll, and sucks a working fluid into a suction chamber. A scroll type fluid machine according to claim 1. 6. A scroll type fluid machine according to claim 1, further comprising means for adjusting the amount of working fluid sucked into the suction chamber. 7. A scroll type fluid machine according to claim 1, further comprising means for adjusting the temperature of the working fluid sucked into the suction chamber.