JPS593195A - Vane type compressor pump - Google Patents

Abstract

PURPOSE:To reduce friction between rotor and sleeve by providing a thermally sprayed layer of synthetic resin of moderate porosity and containing soft metal on the inner side of the sleeve engaged to the rotor face or the inner side of the housing. CONSTITUTION:A thermally sprayed layer 10 made of synthetic resin containing soft metal and having moderate porosity is built-up on rotor 4 surface. There is no actual clearance between the said thermally sprayed layer 10 and the inner surface of housing 3 when rotor 4 is rotating. If there is unevenness on the surface of thermally sprayed layer 10 or inner surface 2 of housing 3 and the clearance between rotor 4 and inner surface 2 of housing 3 is smaller than the thickness of said layer 10, the layer 10 is crushed in response to such clearance preventing slip between the rotor and the sleeve and eliminating friction.

Description

[Detailed description of the invention] The present invention relates to an improvement of a vane type 8 compression pump.

Conventionally, a housing has a rotor located eccentrically with respect to the center of a housing having a cylindrical inner surface, and a vane is fitted into a vane groove extending radially outward from the rotor so as to be slidable in the radial direction. Several types of vane-type compression pumps, which pump fluid by the rotation of a rotor, have been put into practical use.
1-48883, Special Publication No. 52-253, etc.).

By the way, the gap between the housing mouth surface and the rotor surface is the position where the suction port and the discharge port should be separated, and theoretically there should be no gap.
It is normal to have a small gap of about Rn (150μ).

Therefore, when the pump is operated, the air in this small gap blows through, so the amount of air does not contribute to the amount of intake air, resulting in a decrease in volumetric efficiency and flow rate. ζ.

The present invention has been made in view of the above-mentioned conventional problems.
A synthetic resin containing soft metal is made of a synthetic resin containing a soft metal by thermal spraying, a rotor surface or a housing having a moderate amount of pores, using a specific material and m-spraying technique proposed by the applicant in Japanese Patent Application No. 56-177357. The sleeve is fitted inside the sleeve and is formed on a circular surface so that the solvent outlet contacts the housing or the sleeve with virtually no gap during rotation of the rotor, thereby preventing air from blowing through and improving volumetric efficiency. It is 7C% as expected.

Embodiments of the invention will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a vane-type compression pump 1 includes a housing 3 having a substantially cylindrical inner surface 2, a rotor 4 located eccentrically with respect to the center of the housing, and a rotor 4 extending radially outward from the rotor 4. Extending vane groove 5. . . , 5 are fitted with vanes 6, . It is.

On the surface of the rotor 4, a thermally sprayed layer 10 made of synthetic resin containing soft gold and having a suitable number of holes is formed, and during the rotation of the rotor 4, the thermally sprayed layer 10 touches the circular surface 2 of the housing 3. They are made to contact each other with virtually no gaps.

FIG. 2 shows a cross section of the thermal sprayed layer 10 formed on the surface of the rotor 4. Does the thermal sprayed layer 10 have sufficient heat resistance against severe thermal and pressure conditions? Of course, the surface of the rotor 4 is coated with sufficient peeling resistance, and furthermore, the surface of the rotor 4 and the inner surface 2 of the housing 3 do not cause a blow when they come into contact. It has to be something.

As the thermal sprayed layer 10, a thermal sprayed layer 10 made of a soft metal 11 and a heat-resistant synthetic resin 13 and having a suitable number of holes 12 inside is selected.

As the soft gold@11, aluminum (containing a slight amount of silicon) is most suitable, and copper and other metals having physical properties close to those of aluminum and copper can be used.

Aluminum is optimal because it has an appropriate melting point and specific heat, is inexpensive to manufacture, and the raw material itself is inexpensive.

As the heat-resistant synthetic resin 13, a cyclic polyester resin is most suitable, but any heat-resistant synthetic resin having physical properties similar to this resin may also be used.

The reason why cyclic polyester resin is most suitable is that this resin has high heat resistance (softens at 220°C and decomposes at 513°C), has good tooth impact absorption ability, and is also resistant to lubricating oil, etc. It is chemically stable.

The mixing ratio of the heat-resistant synthetic resin 13 and the soft metal 11 is such that each powder has a particle size of about 50μ.
The possible range is 10 to 90 MM%, especially 40 to 6 MM%.
0M amount% shows good physical properties.

That is, if the proportion of aluminum is too small, the adhesion will be weak, and if the proportion of aluminum is too large, the shock absorbing force in the event of a collision will be lost.

As shown in FIG. 3, the solvent is a mixture of powders of soft metal 11 and heat-resistant synthetic resin 13, and then mixed with non-null 14.
Plasma area 17 along with Sword S and Alkonganu 16
This is done by spraying it onto the surface of the rotor 4.

All holes 7 are generated in the layer during thermal spraying, and are formed in the post-process (when the rotor 4 rotates) to facilitate the formation of the M-resistant layer 10 and prevent impact with the housing 3, etc. Relax and absorb. The pore ratio in this case is related to the layer thickness, but is 40 to 60% in terms of shock absorption capacity.

is appropriate; if it is less than 40%, the shock absorption ability will decrease, and if it is less than 60%
Above this, the adhesion and strength of the thermal sprayed layer 10 decrease, which is not desirable. This perforation rate can be easily obtained by appropriately setting the firing conditions such as the bath firing path j and 1M1 sinking according to the content of the soft metal 11.

The total layer thickness is suitably about 150 in. from the viewpoint of shock absorption ability and the distance between the surface of the rotor 4 and the inner surface 2 of the housing 3.

It is preferable that the surface of the rotor 4 is treated with a plastic layer 111 of the solvent to form an uneven surface to improve the cleanliness and quality of the sprayed layer 10.

When the rotor 4 rotates in the vane type compression pump 1 having the number of grooves as described above, the thermal spray layer 10 or the circular surface 2 of the housing 3
It is in contact with virtually no gap.

The thermal sprayed layer 10 and the circular surface 2 of the housing 3 are uneven, and the gap between the rotor 4 and the circular surface 2 of the housing 3 is also uneven.
When the thickness is 1, the sprayed layer 10 is collapsed according to the gap.

Figure 4 shows the relationship between the load and deformation when the heat-resistant synthetic resin 13 of the solvent layer 10 used in this example has a mixed ratio of 60M fluorite% and a porosity of about 50% and is compressed. Shown below.

It exhibits slight elasticity up to point a, but after that it undergoes plastic deformation (f'L) under a constant load N (approximately 400 KP/cΔ).
progresses and reaches 6 points. At six points with a deflection rate of 30 to 40%, there are almost no pores, so the plastic hairstyle reaches its limit and the load increases.

At the point in the middle of the plastic mold, the load M'x takes the path indicated by the broken line in the figure.

Now, for example, if the vane 6 passes through the minimum gap of 150μ, the angle at which the previous vane 6 opens the discharge port 8 is 50 degrees, and the compressed air pressure w 4 gy/cri abs, then 4
Q Q For cc/vol pumps, the amount of air in the atrium is ■
Low ÷ 4 Q cc.

Since the volumetric efficiency of conventional pumps is approximately 85%, the amount of air intake per revolution is V = 400 x 0.85 = 340
Becomes CC.

Therefore, as shown in FIG. 5, if the solvent layer 10 is made substantially void-free with a thickness of 150μ as in the present application, the volumetric efficiency becomes 340-40/400=0.95. The volumetric efficiency is improved by 10% compared to the case of gaps.

When the solvent layer 10 is formed on the rotor 4 as in the above embodiment, since the sprayed layer 10 has a heat insulating effect, the accumulation of adiabatic compression in the rotor 4 is reduced, and the temperature rise in the bearing portion is suppressed. n. No more lubricating oil.

It is also possible to form the sleeve 9 on a circular surface.

Furthermore, when the thermal spray layer 10 is impregnated with oil, the rotor 4 always rotates at 7 mousses due to the lubrication effect.

As the above description clearly shows, the uninvention is to form a solvent layer of a specific material on the surface of the rotor, so that the sprayed layer comes into contact with the housing etc. with virtually no gaps during rotation of the rotor. This prevents air from blowing through, improving volumetric efficiency and increasing the flow rate.

Furthermore, since it is basically only necessary to form a sprayed layer on the surface of the rotor, etc., it can be easily applied to existing rotors, etc.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a vane-type compression pump, the second figure is an enlarged cross-sectional view of the solvent layer, Figure 3 is a cross-sectional view showing the thermal spraying method of the sprayed layer, and Figure 4 is the relationship between load and deflection rate. Graph, 5th
The figure is a graph showing the relationship between thickness 9 gap and volumetric efficiency.
The figure is a sectional view of a vane-type compression pump in which a sleeve is fitted on the inner surface of the housing. 1... Vane type compression pump, 2... Inner surface,
3...Housing, 4...Rotor, 5...
Vane groove, 6... Vane, 7... Suction port °,
8...Discharge port, 9...Sleeve, 10...
・Thermal spray layer, 11... Soft metal, 12... Holes,
13...Heat-resistant synthetic resin.

Claims (1)

[Claims] (1) A housing having a substantially cylindrical circular surface, a rotor located eccentrically with respect to Hu in the housing, and a vane fitted into a vane groove extending radially outward from the rotor so as to be slidable in the radial direction. In a vane-type pressure pump that pumps fluid through one pass of the rotor, a solvent layer made of synthetic or porcelain resin containing soft gold and having appropriate pores is fitted into the housing on the rotor surface 1bL. is formed on the inner surface of the equipped sleeve, and during rotation of the rotor,
A vane type compression pump characterized in that the sprayed layer contacts the housing and the sleeve with no gaps.