JPH0541274Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a heat insulating structure for a scroll compressor.

[Prior Art] As shown in FIG. 10, a conventional scroll compressor includes a fixed scroll 1 having a spiral wrap 1b erected on the inner surface of an end plate 1a, and a spiral wrap 1b on the inner surface of an end plate 2a. Orbiting scroll 2 with lap 2b erected
The fixed scroll 1 has a suction path 3 on the outer circumferential side of the fixed scroll 1, and both scrolls 1 and 2 sequentially perform compression from the outer circumferential side to the inner circumferential side. The compressed fluid is discharged from a discharge path 1c located in the center of the chamber.

[Problems to be solved by the invention] In the conventional scroll compressor as described above, when the high-temperature compressed fluid passes through the discharge path 1c of the fixed scroll 1, the high heat of the compressed fluid is caused by the high temperature of the fixed scroll 1. This was directly transmitted to each part, causing a rise in the temperature of the fixed scroll 1.

In the case of an air-cooled, oil-free scroll compressor, this temperature rise in the fixed scroll 1 is caused by the tip seal 4 of the orbiting scroll 2 sliding on the fixed scroll 1.
In addition, the life of the tip seal 5 of the fixed scroll 1 that slides with the orbiting scroll 2 is reduced, and furthermore, the thermal deformation of the fixed scroll 1 causes seizure of the tip of the lap 1b. Conventionally, as shown in Utility Model Publication No. 63-43427,
The temperature of the fluid flowing into the discharge path in the center of the fixed scroll becomes high due to the heat of compression, and is directly transmitted to each part of the fixed scroll. For this reason, cooling air is applied to the outer surface of the scroll to cool it down, but in this case, the high temperature heat is transferred to the wraps of each scroll, and then the outer surface of the scroll is cooled. The problem caused by thermal deformation of the wrap could not be resolved.

[Means for Solving the Problems] Accordingly, the present invention provides a configuration in which a heat insulating material is attached to the inner surface of the discharge path of the fixed scroll in a scroll compressor, so that high temperature discharge fluid can flow through the discharge path of the fixed scroll. The purpose is to block heat transfer when passing through the fixed scroll, thereby preventing a rise in temperature of the fixed scroll.

Furthermore, the present invention provides a scroll compressor in which a heat insulating material is attached to the inner surface of the discharge path of the fixed scroll, a pipe joint is attached to the discharge path of the fixed scroll, and a The above problem is solved by forming a cooling flow exhaust passage between cover plates attached to the tips of the cooling fins.

[Function] In a scroll compressor, when the compressed high-temperature discharge fluid passes through the discharge path of the fixed scroll, a heat insulating material is provided on the inner surface of the discharge path, so that the heat of the high-temperature discharge fluid is absorbed. , is blocked by the heat insulating material part, and can prevent heat from being transferred from the center part to the outer peripheral part of the fixed scroll. Therefore, it is possible to prevent the temperature inside the compressor body including the fixed scroll from increasing due to the high heat of the discharged fluid.

Furthermore, by passing a cooling flow around the outer periphery of the pipe joint in the discharge path of the fixed scroll, heat transfer from the pipe joint to the fixed scroll can be prevented. moreover,
It is possible to cool the high temperature compressed air inside the pipe joint and the discharge route.

[Example] Hereinafter, an example of the heat insulating structure of a scroll compressor according to this invention will be described based on FIGS. 1 to 9.

1 is a fixed scroll, and the fixed scroll 1
A spiral wrap 1b having an involute shape is provided upright on the inner surface of the end plate 1a.

On the other hand, reference numeral 2 denotes an orbiting scroll, and the orbiting scroll 2 has an involute spiral wrap 2b erected on the inner surface of an end plate 2a, and the fixed scroll 1 and the orbiting scroll 2 face each other and engage with each other. , is configured to be able to rotate by a drive source (not shown).

Note that the laps 1b and 2 of the scrolls 1 and 2
Tip seal grooves are formed at the tips of b, respectively, and tip seals 4 and 5 are attached to the tip seal grooves.
5, the lap 1b of both scrolls 1 and 2,
This prevents leakage between the tip of 2b and the inner surface.

Further, the fixed scroll 1 has a suction path 3 formed on its outer circumferential side and a discharge path 1c formed in its center. A cover plate 6 is attached to the outside of the cooling fins 1d formed on the back surface of the fixed scroll 1. On the inner surface of the discharge path 1c,
For example, a heat insulating material 7 made of heat-resistant resin or ceramic is attached.

With the above configuration, when the orbiting scroll 2 rotates relative to the fixed scroll 1 by a drive source (not shown), the suction port 6a formed on the outer periphery of the cover plate 6, the fixed scroll 1
Fluid is introduced between the fixed and rotating scrolls 1 and 2 through a suction port 3 formed on the outer periphery of the scroll, and is sequentially compressed and discharged from a discharge path 1c in the center of the fixed scroll 1. .

The temperature of the compressed fluid flowing into the discharge path 1c becomes high due to the heat of compression;
The inner surface of the fixed scroll 1 is made of a heat insulating material 7 made of heat-resistant resin or ceramic, so the heat from the high-temperature compressed fluid is blocked by the insulating material 7, and the heat is transferred from the center of the fixed scroll 1 to the outer periphery. transmission can be prevented.

Other examples of attaching the heat insulating material 7 to the discharge path 1c include those shown in FIGS. 2 to 8.

In FIG. 2, a heat insulating material is attached to the inner surface of the discharge passage 1c and the inner surface of the joint 8. In FIG. 3, a joint 8 is connected via a heat insulating material 7 attached to the inner surface of the discharge passage 1c.
Something that has been attached to. In FIG. 4, the joint 8 itself is made of a heat insulating material 7. In FIG. 5, the same heat insulating material 7 as in FIG. 1 is fixed and attached with a joint 8. In FIGS. 6 to 8, the entire inner surface of the discharge passage 1c of the fixed scroll 1 is formed of a heat insulating material 7. In particular, FIGS. 6 and 8 show a structure in which the heat insulating material 7 extends from the side surface of the fixed scroll 1 that is continuous with the discharge passage 1c. By extending the heat insulating material 7 to this side surface side, high heat is blocked to the side surface, and a rise in temperature of the fixed scroll 1 can be prevented.

In the present invention, as long as the heat insulating material 7 is attached to the discharge passage 1c, even if a part of the heat insulating material 7 extends to the side surface, it is included.

Furthermore, in FIG. 9, both scrolls 1 and 2
Cooling fins 1 formed on the back of each
d and 2d, cooling air is applied from the outside for cooling, and a part of this cooling air flows between the outer periphery of the pipe joint 8 connected to the discharge path 1c of the fixed scroll 1 and the cover plate 6. Exhaust passage 9 formed
Since the heat radiated to the outside of the pipe joint 8 is no longer trapped and cooling is promoted, heat transfer from the pipe joint 8 to the fixed scroll 1 can be avoided.

Moreover, the high temperature air within the joint 8 and the discharge path 1c can also be cooled.

[Effects of the invention] The present invention provides a heat insulating structure using a heat insulating material 7 in the discharge path 1c of the fixed scroll 1 where the fluid is compressed and reaches the highest temperature in a scroll compressor in which a tip seal is attached to the tip of the lap. As a result, the heat of the discharged high-temperature compressed fluid can be prevented from being transmitted into the scroll compressor main body including the fixed scroll 1, and as a result, the temperature of the scroll compressor main body can be reduced.

In addition, since cooling of the pipe joint 8 connected to the discharge path 1c of the fixed scroll 1 is promoted, the pipe joint 8
Furthermore, heat transfer to the fixed scroll 1 can be avoided, and the temperature of the fixed scroll 1 can be reduced.

Therefore, the temperature of the fixed scroll 1 can be reduced,
By reducing the temperature at the tip of the wrap 1b of the fixed scroll 1, the temperature of the tip seals 5, 4 attached to the tips of the wraps 1b, 2b of both the fixed and orbiting scrolls 1, 2 is reduced, and the temperature of the tip seals 5, 4 is reduced. can be used for an even longer period of time.

Furthermore, the problem of seizure of the tip of the wrap 1b due to thermal deformation of the fixed scroll 1 can be solved, and furthermore,
In a scroll compressor having a structure in which the outer surface of the scroll is simply cooled without installing the heat insulating material 7 in the discharge path 1c, it is almost difficult to reduce the temperature of the heat of the internal lap and tip seal. The heat insulating structure of the present invention allows the high temperature fluid to be discharged without heat transfer to the fixed scroll, so the heat insulating effect of the heat insulating structure of the present invention is remarkable, especially in air-cooled, oil-free scroll compressors. Become.

Furthermore, since the outside of the pipe joint 8 is also cooled, the heat insulation effect and the cooling of the inside of the pipe joint 8 and the discharge path 1c are achieved, and the heat insulation effect on the fixed scroll 1 is increased.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the present invention.
2 to 9 show other embodiments of the present invention,
A partial sectional view showing only the main parts. FIG. 10 is a partial sectional view of a conventional scroll compressor. 1c...Discharge route, 7...Insulating material, 8...Pipe joint, 9...Exhaust passage.

Claims (1)

[Claims for Utility Model Registration] 1. A spiral wrap is erected on the inner surface of the end plate,
A pair of fixed scrolls, each having a tip seal groove formed at the tip of the wrap and a tip seal attached to the tip seal groove, and an orbiting scroll are engaged with each other, and the fixed scroll has a suction path on the outer peripheral side and a discharge path in the center. In the oil-free scroll compressor made by
A heat insulating structure for a scroll compressor in which a heat insulating material is attached to the inner surface of the discharge path of the fixed scroll. 2 A spiral wrap is erected on the inner surface of the end plate,
A pair of fixed scrolls, each having a tip seal groove formed at the tip of the wrap and a tip seal attached to the tip seal groove, and an orbiting scroll are engaged with each other, and the fixed scroll has a suction path on the outer peripheral side and a discharge path in the center. In the oil-free scroll compressor made by
A pipe joint that communicates with the discharge path of the fixed scroll is attached, and the pipe joint is passed through the center hole of the cover plate attached to the tip of the cooling in formed on the back surface of the fixed scroll, and the outer periphery of the pipe joint and A heat insulating structure for a scroll compressor, in which a cooling flow exhaust passage is formed between the cover plate and the center hole.