JPH03233187A - Refrigerant pump - Google Patents

Abstract

PURPOSE:To decrease wear of a crankshaft and a bearing by providing a bush made of composite material of molybdenum disulfide, which has self-lubricating property, on a slide surface of the bearing which forms a mechanical part of a compressor. CONSTITUTION:A refrigerant pump 21 has an electric motor part 7, which is composed of a rotor 5 and a stator 6, and a mechanical part of a compressor 8. A bush 23 made of composite material of molybdenum disulfied is provided on a slide surface 23a of a bearing 10. When a crankshaft 22 rotates and slides inside the bush 23, the surfaces of the crankshaft 22 and the bush 23 become smooth owing to the self-lubricating effect of the bush 23. So, the frictional coefficient is decreased. Thus, wear of the crankshaft 22 and the bearing 10 can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refrigerant pump used in the field of refrigeration and air conditioning.

2. Description of the Related Art In recent years, air conditioning equipment equipped with a refrigerant pump that circulates liquid refrigerant has been commercialized in the refrigeration and air conditioning industry. Until now, most refrigerant pumps have been of the magnet-driven type, as disclosed in Japanese Utility Model Application Publication No. 68-104376, which has few sliding parts and has a small load.

However, because it is difficult to increase the size and has poor stability, rotary types have recently become more popular.

An example of this rotary refrigerant pump will be explained with reference to FIGS. 3 and 4.

In Figures 3 and 4, 1 is a conventional refrigerant pump;
Discharge pipe 2. A motor section 7 consisting of a rotor 5 and a stator 6 and a compressor section 8 are provided in a closed container 4 having an electrode 3. Reference numeral 9 denotes a crankshaft that is directly connected to the rotor 6 and drives the compressor machine section 8, and nothing is applied to the sliding surface 9a. Further, reference numeral 9b denotes an oil groove which supplies oil and lubricates the sliding surface 9a by rotation. A bearing 10 supports the crankshaft 9 via a sliding surface 9a. 11 is a refrigerant liquid located in the closed container 4. 12 is a suction pipe.

In the above configuration, when the electric motor section 7 is energized through the electrode 3, the rotor 6 rotates and at the same time, the crankshaft 9 rotates and slides within the bearing 1o, operating the compressor machine section 8 and performing a compression stroke. conduct.

Problems to be Solved by the Invention However, in the above configuration, since the inside of the closed container 4 is refrigerant liquid 11, the sliding surface 9a between the crankshaft 9 and the bearing 1o slides without lubrication. There was a problem in that the crankshaft 9 and the bearings 10 corresponding to 9a were significantly worn, reducing the reliability of the refrigerant pump.

The present invention solves the above problem by providing a refrigerant pump that reduces wear on the weight, crankshaft, and bearings.

Means for Solving the Problems In order to solve the above-mentioned problems, the refrigerant pump of the present invention has a sliding surface of the bearing made of a self-lubricating molybdenum disulfide (M o S 2 ) composite material. It is equipped with a bushing and has a smooth crankshaft surface.

Effects of the present invention With the above-described configuration, the surface energy (frictional resistance) of molybdenum disulfide can be reduced without interfering with the molybdenum disulfide, thereby achieving a friction reduction effect, reducing wear on the crankshaft and bearings, and improving the reliability of the refrigerant pump. This will improve your sexuality.

EXAMPLE Hereinafter, a refrigerant pump according to an example of the present invention will be described with reference to the drawings. Note that parts that are the same as those in the conventional example will be described using the same reference numerals, and parts that are the same in structure and operation will be omitted.

In FIG. 1, 21 is a refrigerant pump of the present invention. 2
2 is a rank shaft with a smooth surface, and 23 is a bushing formed of a composite material of molybdenum disulfide on the sliding surface 23a of the bearing 1o.

In the above configuration, when the crankshaft 22 rotates and slides inside the bushing 23 provided in the bearing 1o via the sliding surface 23a, the self-containing material coated as a synthetic resin agent on the sliding surface 22a of the crankshaft 22 is removed. Due to the lubricating action of the bushing 23 made of lubricant, the crankshaft 2
2 and the bushing 23 become smooth and the friction coefficient becomes low, so that wear of the crankshaft 22 and the bushing 23 is reduced.

Therefore, the reliability of the refrigerant pump can be improved.

Effects of the Invention As described above, the present invention reduces the wear of the crankshaft and bearings by providing a bushing made of a self-lubricating molybdenum disulfide composite material on the sliding surface of the bearing forming the compression machine part. Therefore, the reliability of the refrigerant pump can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a refrigerant pump according to an embodiment of the present invention, FIG. 2 is a partial sectional view of FIG. 1, FIG. 3 is a sectional view of a conventional refrigerant pump, and FIG. 4 is a portion of FIG. 3. FIG. 7...Electric motor section, 8...Compressor machine section,
1o... Bearing, 21... Refrigerant pump, 22... Crankshaft, 22a...
...Sliding surface, 23...butsu.彎 - Guikaku Rensou Sanzaki Guo Base) Gun 5! army pump crankshaft lash

Claims (2)

[Claims] (1) An electric motor section, a compressor section driven by the electric motor section, and a bush made of a composite material of molybdenum disulfide, which is a self-lubricating material, on the sliding part of the bearing forming the compressor section. Refrigerant pump. (2) The refrigerant pump according to claim 1, wherein the crankshaft is subjected to nitriding treatment.