JPH04153596A - Vane type compressor - Google Patents

Abstract

PURPOSE:To improve the thermal cycle efficiency of a refrigeration device and solve the trouble that cloudiness is generated on a sight glass by constituting an oil separating means from a main body part which has a sealed hollow part and an oil discharge hole drilled on the bottom wall, gas introducing passage, and a gas lead-out pipe. CONSTITUTION:The coolant gas which is introduced into a compression chamber in a rotor chamber 15 from a suction chamber 24 is compressed in the compression chamber by the revolution of a rotor 22, and introduced into the hollow part 51 of an oil separator 50 through a gas discharge port 28, discharge chamber 29, and a gas introducing passage 42. Since the gas introducing passage 42 is opened in the tangential direction into the hollow part 51, the introduced coolant gas forms a turning flow, and the oil mist having a high specific gravity is energized in the centrifugal direction by the turn, and adheres on the inner wall surface of the hollow part 51. Further, the adhere oil is dropped by the gravity, and collected on the bottom part, and dropped on the bottom part of an oil reservoir chamber 25 from an oil discharge hole 53. Accordingly, the oil is hardly stored on the upper surface of the bottom wall part 52, and oil is not splashed up during the time when the turning gas flow changes direction from the downward to the upward.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vane type compressor, and more particularly to an oil separation means for a pen type compressor.

[Prior Art] Japanese Utility Model Application Publication No. 59-133795 discloses a pen-type compressor in which a centrifugal type oil separation means is housed in the upper part of an oil sump chamber. This oil separation means swirls the discharged gas introduced into the hollow part, and the oil mist accelerated in the centrifugal direction by this swirling flow passes through the wire mesh at the bottom of the side wall surrounding the hollow part to the outside, that is, to the oil sump chamber. It is stored.

However, the above-mentioned conventional centrifugal oil separation means has the disadvantage of low oil separation efficiency, and therefore, the applicant has previously proposed a vane type compressor with an equilibrated separation type oil separation means. (See Figures 8 and 9) That is, this oil separation means
A deflector 104 is provided in front of the outlet of a gas introduction passage (not shown) that is penetrated through the Noah side plate 101 and the cover plate 102. The oil mist-containing gas whose direction is changed to both sides by the deflector 104 is turned downward by the collision plates 105 on both sides of the deflector 104, and then laterally by the wind-up prevention body 106 provided below the collision plate 105. The direction is changed to . On the other hand, the oil mist that could not follow the above direction change is in the oil sump chamber 1.
It is stored at the bottom of 07. The relationship between the oil rate (oil mist content of refrigerant gas), the oil level in the oil sump, and the rotation speed using this collision separation type oil separation means is as follows.
Shown in Figure 0.

[Problems to be Solved by the Invention] However, in the conventional centrifugal separation type and equilibrated separation type oil separation means described above, the oil rate reaches 3% or more, and a thick oil film adheres to the inner surface of the evaporator of the refrigeration equipment. This is a factor that reduces the heat transfer efficiency and reduces the cycle thermal efficiency of the refrigeration equipment.

In particular, the centrifugal separation type oil separation means mentioned above has a wire mesh at the bottom of the side wall, and if the wire mesh is rough, the swirling gas flow will miss the wire mesh and enter the oil sump chamber, resulting in oil mist adhering to the wire mesh. If the wire mesh is too fine, the attached oil mist will not pass through the wire mesh and will accumulate at the bottom of the hollow part. After the swirling flow inside the hollow reaches the bottom surface, it rises again and flows into the gas outlet pipe, so if oil accumulates at the bottom like this, the swirling gas flow will swirl up the oil at the bottom again. There was a problem.

Furthermore, if the oil rate is high, a two-layer separation occurs where the refrigerant and oil are separated, and there is also the problem that the sight glass for checking the amount of refrigerant becomes slightly foggy.

The present invention has been made in view of these problems, and a technical problem to be solved is to provide a vane compressor equipped with an oil separation means having the above-mentioned excellent oil separation efficiency.

[Means for Solving the Problems] The vane compressor of the present invention includes a housing, an oil sump chamber separated from the compression mechanism section by a side plate within the housing, and an oil sump chamber housed in the upper part of the oil sump chamber. separation means, the oil separation means has a main body having a cylindrical closed hollow part and an oil drainage hole bored in the bottom wall, and a main body part having a cylindrical closed hollow part and an oil drain hole bored in the bottom wall; It is characterized by comprising a gas introduction passage communicating with the gas discharge chamber of the mechanism part, and a gas outlet pipe penetrating the top wall of the main body part and hanging concentrically into the hollow part.

[Function] The oil separation means has an oil drain hole bored in the bottom wall of the main body of the oil separation means.

The discharged gas introduced into the hollow part from the gas introduction path forms a swirling flow, and the oil mist, which is urged in the centrifugal direction by this swirling flow, adheres to the inner wall surface of the hollow part and falls due to gravity to the bottom wall. It collects and is collected at the bottom of the oil sump chamber through the oil drain hole.

In particular, the oil separation means of the present invention is provided with an oil drain hole in the bottom wall, and the oil that reaches the bottom wall is quickly discharged from the oil drain hole, so that the swirling gas flow does not swirl up the oil again. Prevented.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure is a longitudinal sectional view of a vane type compressor.

First, the compression mechanism section will be explained.

Front housing 11 and rear housing 1 coupled to each other
A cylinder 1 having an elliptical through hole is housed and fixed inside the cylinder 2, and the openings at both ends of the cylinder 1 are connected to the front side plate 13 and the rear side plate 14.
A rotor chamber 15 having an elliptical longitudinal section is formed by closing each of the rotor chambers 15 and 15. Bearings 16 are located in the shaft holes of both side plates 13 and 14.
．． A drive shaft 18 is rotatably held through the shaft seal 17, and one end of the drive shaft 18 protrudes through the shaft hole of the front housing 11 through the shaft seal 19, and a driven part of an electromagnetic clutch (not shown) is attached to the tip of the drive shaft 18. Fixed.

A rotor 20 with a circular cross section is housed in a rotor chamber 15 and fixed to the drive shaft 18, and four vane grooves (not shown) are formed rotationally symmetrically on the outer circumference of the rotor 20. Four vanes are held in the vane groove so as to be retractable in the radial direction.

Four compression chambers are created in the rotor chamber 15 surrounded by the two adjacent vanes, the outer peripheral surface of the rotor 20, the inner peripheral surface of the cylinder 1, and the inner peripheral surfaces of the side plates 13 and 14.

Inlet 2 between the front side plate 13 and the front housing] 1
4 is formed, and an oil reservoir chamber 25 is formed between the rear side plate 14 and the rear housing 12. The suction chamber 24 is communicated with the above-mentioned compression chamber through a suction passage 26 and a suction port 27 provided through the front plate 13 and the cylinder 1 at a predetermined rotation angle position. Further, this compression chamber communicates with a discharge chamber 29 in the cylinder 1 through a gas discharge port 28 at a predetermined rotational angle position of the relaxation, and the discharge chamber 29 is connected to a gas discharge chamber 29 provided through the rear side plate 14 and the cover plate 40. It communicates with the oil reservoir chamber 25 through a discharge hole 41 and a gas introduction path 42 provided through the cover plate 40 . Note that 30 is a discharge valve, and 31 is a retainer.

Next, the oil reservoir chamber 25 and the oil separator 50 will be explained.

An oil separator (oil separation means in the present invention) is integrally provided on the upper part of the cover plate 40 that is in close contact with the outer surface of the rear side plate 14, and is housed in an oil reservoir 25.

This oil separator 50 will be explained in detail below. FIG. 2 is a cross-sectional view of this oil separator 50, and FIG. 3 is a plan view showing the outer surface of the bottom wall of the main body of the oil separator 50.

The oil separator 50 has a main body part 54 provided with a pair of cylindrical sealed hollow parts 51 on the left in FIG. It is set up. The main body part 54 is formed integrally with the lid plate 40, and the gas introduction passage 42 passes through the lid plate 40 and the main body part 54 and opens in the upper part of the hollow part 51 in the tangential direction. Top wall 55 of main body portion 54
A gas outlet pipe 56 having both ends open hangs concentrically into the hollow part 51 through the bottom wall 5.
2 at a predetermined interval. Furthermore, the outlet of the gas outlet pipe 56 communicates with the upper part of the oil reservoir chamber 25 and is provided close to a gas supply port 57 provided at the top of the housing 12 . Incidentally, the bottom wall 52 of the main body part 51 is formed separately from the main body part 51 and is fitted into the lower opening of the main body part 51.

The refrigerant gas sucked into the compression chamber in the rotor chamber 15 from the suction chamber 24 is compressed in the compression chamber as the rotor 20 rotates, and then passes through the gas discharge port 28 , the discharge chamber 29 , and the gas introduction path 42 to the oil separator 50 . It is introduced into the hollow part 51.

Since the gas introduction path 42 is opened tangentially to the hollow part 51, the refrigerant gas introduced into the hollow part 51 forms a swirling flow, and due to the swirling of the refrigerant gas, the oil mist with a high specific gravity flows in the centrifugal direction. It is urged to adhere to the inner wall surface of the hollow part 51. Furthermore, the oil adhering to the inner wall surface of the hollow part 51 falls due to gravity to the bottom of the hollow part 51 (above the bottom wall 52).
The oil collects in the oil drain hole 53 and falls to the bottom of the oil sump 25.

That is, in this embodiment, since almost no oil is stored on the upper surface of the bottom wall portion 52 of the main body portion 5o, oil is not rolled up again when the direction of the swirling gas flow is changed from downward to upward.

FIG. 4 is a perspective view showing the operating principle of this oil separator, and FIG. 5 shows the relationship between the oil level stored in the oil reservoir and oil reservoir chamber 25 of the oil separator 5o of this embodiment and the rotation speed.

As can be seen by comparing FIG. 5 and FIG. 10, a significant reduction in the oil rate can be achieved.

FIG. 6 shows the temperatures at which mist and fogging of the sight glass occurs in the compressor of this embodiment and the conventional compressor (see FIG. 1). According to this embodiment, the temperature at which mist and clouding occur can be increased by 20° C. or more compared to the conventional method (FIG. 8).

Further, FIG. 6 illustrates the cooling capacity of the compressor of this embodiment and the conventional compressor (see FIG. 8). As you can see from this figure, it has become possible to significantly improve the cooling capacity over almost the entire rotation range.

A modification of this embodiment is shown in FIG. However, elements with the same functions are given the same numbers as in the above embodiment.

In this oil separator 70, the hollow part 51 has a funnel shape, and as the oil adheres to the inner circumferential surface 71 falls, it collects, increases the falling speed, and quickly reaches the oil drain hole 53. can.

A total of eight vertical grooves 72 are formed in this inner circumferential surface 71, and the oil mist M adhering to the inner circumferential surface 71 is moved along the inner circumferential surface 71 by its own weight and the urging force of the swirling gas flow. (see Fig. 7) to form these vertical grooves 7.
2 and can collect in the vertical groove 72 and fall rapidly without much contact with the swirling gas flow.

Therefore, by doing this, oil is prevented from being rolled up again from the inner circumferential surface 71 due to the swirling gas flow.

[Effects of the Invention] As explained above, the vane type compressor of the present invention has an oil drain hole in the main body or bottom wall of the oil separation means.

Therefore, it is possible to prevent oil from being drawn up again from the bottom of the hollow part, reducing the oil rate in the refrigerant gas flow, thereby improving the heat transfer efficiency of evaporators, condensers, etc., and ultimately the heat cycle efficiency of refrigeration equipment. can do.

Furthermore, it is possible to prevent two-phase separation in which the refrigerant and oil separate, and to eliminate the problem that the sight glass for checking the amount of refrigerant becomes slightly foggy.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the vane type compressor of this embodiment, Fig. 2 is a cross-sectional view of the oil separator of this embodiment, Fig. 3 is a plan view showing the bottom outer surface of this oil separator, Fig. 4 is a transparent explanatory diagram showing the operating principle of the oil separator of this embodiment, Fig. 5 is a characteristic diagram showing the oil rate and oil level of the vane type compressor of this embodiment, and Fig. 6 is a diagram showing the oil rate and oil level of the vane type compressor of this embodiment. Figure 7 is a cross-sectional view showing a modification of this example, and Figure 8 is a characteristic diagram showing the mist on the sight glass, fogging temperature, and improvement in cooling capacity in a refrigeration system using a vane-type compressor. FIG. 9 is a front view showing a conventional oil separator, and FIG. 10 is a characteristic diagram showing oil rate and oil level of a conventional pen-type compressor. 11.12... Housing 14... Rear side plate (side plate) 25... Oil reservoir chamber 50... Oil separator (oil separation means) 51... Hollow part 2... Gas introduction path 2. ...Bottom wall 3...Drain hole 4...Main part 5...Top wall 6...Gas outlet pipe

Claims (1)

[Scope of Claims] A housing, an oil sump chamber separated from the compression mechanism section by a side plate within the housing, and a centrifugal type oil separation means housed in the upper part of the oil sump chamber, the oil The separation means includes a main body portion having a cylindrical sealed hollow portion and an oil drain hole bored in the bottom wall, and a main portion that opens in a tangential direction at the upper part of the inner wall of the hollow portion and communicates with the gas discharge chamber of the compression mechanism portion. 1. A vane type compressor comprising: a gas introduction path penetrating the top wall of the main body portion and concentrically hanging down within the hollow portion.