JPH0433424Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an open type refrigeration compressor.

[Conventional technology]

FIG. 2 is a longitudinal sectional view of a conventional open type refrigeration compressor.

When an open compressor is used for refrigeration, the suction gas pressure is in the vacuum range, so the pressure inside the shaft seal chamber 12 where the shaft seal 4, which is a mechanical seal mechanism, is located is also in the vacuum range, and the pressure from the outside of the compressor is Due to air intrusion and poor lubrication that occurs at that time, the seat ring 4a of the shaft seal
If this occurs, the sliding surface of the driven ring 4b may become rough, which may impair reliability.

Therefore, the oil accumulated in the crank chamber 13 is forcibly supplied to the shaft seal chamber 12 from a notch 6a provided in the crankshaft 5 via an oil passage 6 provided in the crankshaft 5 by an oil pump 10 through a strainer 9. . Furthermore, a sealed bearing is used as the bearing 2 to prevent oil leakage from the bearing 2 to the crank chamber 13 side. On the other hand, in order to prevent an abnormal pressure rise in the chamber 12, a relief valve 7 is installed. In addition,
20 is a piston, and 30 is a cylinder.

However, in the conventional type described above, there are problems with the sealing performance and durability of the sealed bearing 2, and the shaft seal chamber 12 is often
The pressure could reach a vacuum range, causing problems such as air intrusion and shaft seal leaks as described above.

[Problems that the invention aims to solve] As mentioned above, with the conventional bearings, due to the performance of the sealed bearing, it is not possible to provide sufficient shaft sealing, resulting in problems such as air expansion and shaft seal leakage. It was hot.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention rotatably supports the crankshaft in the crankcase via a bearing, and also includes a shaft seal part that is forcibly lubricated to the outside of the bearing in the axial direction through the crankshaft's crankcase penetrating part. In the refrigeration compressor, a seal plate is provided on the axially outer side of the bearing, the outer peripheral part of which is held between the outer race end face of the bearing and the crankcase, and the inner peripheral part of which is in sliding contact with the inner race end face of the bearing. The refrigeration compressor is constructed by arranging the refrigeration compressor.

[Effect]

By configuring as described above, even if the suction pressure falls into a vacuum range, oil leakage from the shaft seal can be prevented, so the oil pressure in the shaft seal can be maintained.

Therefore, the shaft seal portion does not become vacuum, and air intrusion etc. can be reliably prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Note that explanations of the same components as those of the prior art will be omitted.

In this example, a ring-shaped seal plate 3 is disposed on the axially outer side of a bearing 21 that supports the crankshaft 5. This seal plate 3
is disposed such that the outer peripheral portion thereof is held between the end face of the outer race 21a of the bearing 21 and the crankcase 1, and the inner peripheral portion thereof is in sliding contact with the end face of the inner race 21b of the bearing 21.

Therefore, with the above configuration, the seal plate 3 can reliably prevent the oil forcefully supplied from the oil pump 10 into the shaft seal chamber 12 from leaking to the crank chamber 13 side through the bearing 21. Even if the suction pressure falls into the vacuum range, the hydraulic pressure inside the shaft seal chamber 12 is maintained to prevent the pressure inside the shaft seal chamber 12 from reaching the vacuum range, thereby preventing air from entering from the shaft seal portion. be able to.

[Effect of idea]

As described above, according to the present invention, it is possible to reliably prevent oil leakage at the shaft seal portion, and thus it is possible to eliminate problems caused by air intrusion, shaft seal leakage, and the like.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the main parts showing an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of a conventional device. 1... Crank case, 3... Seal plate, 4... Shaft seal, 5... Crankshaft, 21... Bearing, 21a... Outer race,
21b...Inner lace.

Claims (1)

[Scope of utility model registration request] In a refrigeration compressor, a crankshaft is rotatably supported in a crankcase via a bearing, and is provided with a shaft seal portion that is forcibly lubricated to the axially outer side of the bearing at a crankcase penetrating portion of the crankshaft. A refrigeration compressor characterized in that a seal plate is disposed on the axially outer side, the outer peripheral part of which is held between the outer race end face of the bearing and the crankcase, and the inner peripheral part of which is in sliding contact with the inner race end face of the bearing.