JPS60209690A - Scroll type hydraulic machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a scroll-type fluid machine, and particularly to a scroll-type fluid machine that requires a clean working fluid.

[Background of the invention]

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 this becomes high due to the heat generated as the gas is compressed. For example, when adiabatic compression is performed under the conditions of suction temperature 20℃ and discharge pressure kg/dg without cooling, the temperature reaches approximately 250''C at the highest temperature.Then, the heat in this closed space is transferred to the fixed scroll member l This is transmitted to the orbiting scroll member 2, and the temperature of the inner wall of the suction chamber 13 also increases.As a result, the working fluid in the suction chamber 13 is heated, causing the temperature level of the working fluid in the high temperature section to further rise.

Further, the working fluid in the suction chamber 13 is heated not only by heating from the inner wall of the suction chamber 13 but also by leakage of high-temperature working fluid from the closed space on the high pressure side into the suction chamber 13. When the working fluid in the suction chamber 13 is heated in this way, the volumetric efficiency decreases at a rate of 2 to 3% for a heating degree of 10°C.

Therefore, lowering the temperature inside 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, a conventional method for dealing with this is disclosed in Japanese Patent Laid-Open No. 58-10178.
There is. An example of this is shown in FIG. This is an air compressor in which the air suction pipe 22 is connected to the suction hole of the compressor main body via a heat insulating material 21 to prevent the temperature of the working fluid from rising. However, the suction chamber 1
It has no effect on the high temperature working fluid that leaks into 3.

[Object of the invention] The object of the present invention is to solve the problems of the prior art described above,
Prevents temperature rise of working fluid inside the suction chamber of fluid machinery,
It is an object of the present invention to provide a scroll-type fluid machine that can improve volumetric efficiency, lower gas temperature in a compression stroke, lower discharge temperature, and lower the temperature level of the entire fluid machine, that is, scroll members, bearings, etc.

[Summary of the invention]

The working fluid inside the suction chamber is heated by the high-temperature, high-pressure working fluid leaking from the working chamber, or by heat transfer from the suction chamber wall, so the temperature drops before it is sucked into the working chamber. Due to the rise and expansion, the actual circulating flow rate is less than the circulating flow rate at the temperature before suction. In other words, the apparent volumetric efficiency has decreased. Also,
Since the suction temperature has increased, for example, in the case of a compressor, the discharge temperature has also increased, and the temperature level of the entire fluid machine has increased, causing a decrease in reliability.

In order to prevent the above-mentioned problems, this invention supplies a working fluid in excess of the circulating flow rate specific to the fluid machine to the suction chamber,
It is characterized by a structure in which the amount of heat carried into the suction chamber by the high-temperature, high-pressure working fluid leaking from the working chamber and the amount of heat transmitted from the walls of the suction chamber are carried away to the outside by the working fluid supplied in excess.

Therefore, with the above invention, it is possible to lower the temperature of the working fluid in the suction chamber, and as a result, it is also possible to lower the temperature level of the entire fluid machine. Thereby, the fluid machine can be operated in an ideal state, and reliability and efficiency can be improved.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on drawings of embodiments in which the present invention is applied to a scroll compressor. FIG. 4 shows an embodiment of a scroll compressor according to the present invention, in which 1 indicates a fixed scroll and 2 indicates an orbiting scroll. The fixed scroll 1 has a spiral wrap b having a substantially constant thickness on the negative side of the end plate 1-a, and an annular housing 20 provided to cover the wrap b, which stands upright. Further, a discharge hole 7 for discharging compressed gas is formed approximately in the center of the end plate 1-a, and a suction hole 6 for sucking in suction gas is formed on the outer periphery of the annular housing 20. The orbiting scroll 2 has a spiral wrap 2-b having a substantially constant thickness on one side of the end plate 2-a.
is held upright.

Both scrolls 1 and 2 are offset by 180 degrees from each other and are combined with each other with wraps b and 2-b facing inward. Reference numeral 3 denotes a crankshaft that moves the orbiting scroll 2 at a revolution number, and the crankshaft 3 includes an orbiting bearing 10 provided on the boss 9 of the orbiting scroll 2 and a bearing 8 provided on the frame 4 integrated with the fixed scroll 1. It is supported by. 5 is a balance weight attached to the crankshaft 3, and 12 is a rotation prevention mechanism for the orbiting scroll 2, which is interlocked between the orbiting scroll 2 and the frame 4.

In the figure, reference numeral 14 denotes passage means for guiding the working fluid supercharged into the suction chamber 13 formed inside the annular housing 2o to the space formed by the orbiting scroll 2 and the frame 4. In this embodiment, a fan 15 connected to the crankshaft 3 is incorporated inside the frame 4, and the working fluid supercharged into the suction chamber 13 is introduced into the frame 4 through the passage means 14. It is discharged to the outside from the discharge hole 16.

The inner wall of the suction chamber 13 is cooled by the working fluid, and
Excess working fluid that has taken away heat in the suction chamber 13 is constantly sucked out by the fan 15. Therefore, suction chamber 1
3, there will be a working fluid at a temperature close to that at the time of supercharging. The working fluid is heated 20 in the suction chamber 13.
When the temperature increases in degrees Celsius, the volumetric efficiency decreases by several percent, so the above-mentioned cooling inside the suction chamber 13 can reliably improve the performance.

FIG. 5 shows another embodiment of the present invention, which differs from FIG. 4 in that a working fluid passage 14 is provided in the fixed scroll 1 and the frame 4. According to this embodiment, manufacturing is easier than in the embodiment shown in FIG.

FIG. 6 also shows another embodiment of the present invention, which differs from FIG. 4 in that one working fluid circulation path is configured as a closed loop and an external working fluid supply source 17 is provided. According to this embodiment, since the working fluid circulation path is configured as a closed loop,
It becomes possible to make the compressor semi-hermetic. In addition, if the working fluid is supercharged in the open state, there is a possibility that dust in the atmosphere will be sucked into the compressor, so this embodiment not only makes it possible to make the compressor semi-hermetic, but also to clean the inside. Become. The circulating excess working fluid is cooled by an external cooling means 18 provided in the external circulation path, thereby making it possible to always keep the temperature of the supercharging working fluid constant. In addition, in Fig. 6, the motor is attached to the frame 4.
By incorporating it inside the compressor, it is possible to make the compressor completely hermetic.

Furthermore, in FIG. 6, the temperature of the excess working fluid supplied to the suction chamber 13 can be adjusted by adjusting the amount of cooling of the external cooling means 18. Thereby, a predetermined cooling effect can be obtained with a small amount and a fixed amount of excess working fluid.

FIG. 7 also shows another embodiment of the present invention, which differs from FIG. 4 in that supercharging of the working fluid is performed by an 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 amount of supercharging of the working fluid, the suction chamber can be
It becomes possible to adjust the amount of cooling according to the ambient temperature in step 3.

Although the above embodiment does not show an example in which a filter is provided at the intake port of the working fluid, in order to purify the working fluid and the supercharged working fluid, the working fluid after passing through the filter is sent to the suction chamber. It would be good to introduce it.

FIG. 8 also shows another embodiment of the present invention, which differs from FIG. 4 in that a passage 14 for supercharged working fluid is provided on the end plate of the fixed scroll on the side opposite to the lap. According to this embodiment, the fixed scroll can be cooled, thermal deformation of the fixed scroll can be prevented, and reliability can be improved.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent the temperature of the working fluid in the suction chamber from rising, and also to lower the temperature of the entire fluid machine, thereby improving performance and reliability.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a scroll compressor shown as a conventional example, and FIG. 2 is a plan view of a scroll wrap. FIG. 3 is an enlarged sectional view of the suction section of a scroll compressor shown as a conventional example, FIG. 4 is a longitudinal sectional view of the first embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of the second embodiment of the present invention. FIG. 6 is an enlarged sectional view of the main part of the third embodiment of the present invention;
FIG. 7 is a longitudinal cross-sectional view of a fourth embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view of essential parts of a fifth embodiment of the present invention. 1...Fixed scroll, 1a...Fixed end plate, ib.
...Fixed spiral wrap, 2...Orbiting scroll, 2
a...Swivel end plate, 2b...Swivel spiral wrap, 3
...Crankshaft, 4...Frame, 5...Balance weight, 6...Suction hole, 7...Discharge hole, 8...
・Main bearing, 9... Orbiting scroll boss part, 10...
Swivel 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...
・Insulating material, 22...Air suction pipe, 23...vi l
Day XZ diagram Figure 3 Figure 4 Figure 5 Figure 5 %6 Figure 7 Figure B

Claims (1)

[Scope of Claims] 1. A fixed scroll member having a wrap formed by an involute or a curve formed by a combination of circular arcs is engaged with an orbiting scroll member, and the orbiting scroll member is rotated while being prevented from rotating; In a scroll type fluid machine that moves a closed space constituted by an orbiting surface scroll member and moves fluid in the closed space, means for forcibly supercharging a suction chamber with more working fluid than the fluid machine sucks. A scroll type fluid machine characterized by having a passage means for discharging the supercharged working fluid to the outside of the suction chamber. 2. A fluid passage connecting the suction chamber of the fluid machine and a space formed on the back surface of the end plate of the orbiting scroll is provided to serve as a discharge passage for excess working fluid. Scroll type fluid machine. 3. A patent characterized in that a part of the fluid passage connecting the suction chamber of the fluid machine and the space formed on the back surface of the end plate of the orbiting scroll is formed on the surface of the end plate of the orbiting scroll on the side opposite to the lap. Scroll type fluid machine according to claim 2. 4. A discharge port for excess working fluid supercharged into the suction chamber of the fluid machine is provided on the end plate of the fixed scroll or in the annular housing, and a passage for the discharge fluid is provided on the side wall surface of the end plate of the fixed scroll opposite to the lap. A scroll-type fluid machine according to claim 1, characterized in that: 5. The working fluid supercharged into the suction chamber of the fluid machine is guided from the discharge passage from the suction chamber into the bearing housing (motor chamber) of the fluid machine, and further, it is guided to a fluid passage outside the fluid machine that has a cooling means. 2. The scroll type fluid machine according to claim 1, wherein supercharging is carried out again to the suction chamber through the suction chamber. 6. The scroll type according to claim 1, wherein the suction chamber is supercharged with the working fluid by a pressurized fan that is connected to the drive shaft of the orbiting scroll inside the fluid machine. Fluid machinery. 7. The scroll type fluid machine according to claim 1, further comprising means for adjusting the amount of supercharging of working fluid to the suction chamber. 8. The scroll-type fluid machine according to claim 1, further comprising means for adjusting the temperature of the working fluid supercharged to the suction chamber.