JPS6237986Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a vane pump that has less leakage inside the pump and is easy to assemble.

FIG. 1 shows a conventional example, in which a lower bearing 2, a cylinder 3, and an upper bearing 4 are sequentially stacked on a support plate 1, and a plurality of The rotor 5 and the vane 6 having the vane groove are inserted, and the upper and lower bearings 4,
This is one of the conventional examples of a closed vane pump having a structure in which a cylinder 2 and a cylinder 3 are fastened to the support plate 1 with bolts 7. According to this method, there is a possibility that the center of the upper and lower bearings 4, 2 and the shaft may be misaligned during assembly, and due to uneven contact with the shaft bearing hole, extra torque is applied during pump operation, causing variations in pump characteristics. There were drawbacks such as wear and tear, which caused problems with durability. Also, the upper and lower bearings 4, 2
When a plurality of positioning pins are passed through the upper and lower bearings 4 and 2 and the cylinder 3 in order to properly maintain the axial clearance between the shaft and the outer circumference of the cylinder 3 and the rotor 5, the distance between the pitches of the positioning pins is Tolerances become tighter,
It has drawbacks such as difficulty in processing and increased cost.

Furthermore, when considering a heating cycle using a pump and using refrigerant as the working medium, the liquid refrigerant conveyed by the pump is evaporated in a heater having a burner and heated by an indoor radiator. In this case, it is necessary to reliably supply the refrigerant to the heater to prevent the refrigerant from overheating when the burner is ignited, and complicated control is required when the burner is ignited to prevent thermal decomposition of the refrigerant.

Therefore, the present invention focuses on the above-mentioned drawbacks and attempts to solve them.The main feature of this invention is that the shaft and shaft during assembly can be easily fixed by simply inserting two bearings and a cylinder into the megabox using a fitting method. This prevents misalignment with the hole and maintains appropriate clearance between the axial part of the cylinder inner circumferential surface and the rotor outer circumferential surface, which reduces internal leakage of the pump and is easy to assemble, ensuring reliable transport of the working medium when the pump is started. A pump configuration is provided.

Next, one embodiment of the present invention will be described based on the drawings. In FIG. 2, 8 is a mechanical box into which an upper bearing 9, a lower bearing 10, and a cylinder 11 are inserted in a fitting manner, and 12 is a support plate fastened to the mechanical box 8 with a plurality of bolts 13. 14,1
Reference numerals 5 denote an upper shell and a lower shell each having a discharge pipe 16 and a suction pipe 17, which are welded together with the support plate 12 all around the circumference. 18 is a motor, and power is transmitted by magnets 19 and 20. Note that 26 is the magnet chamber, and 27 is the suction space, which is connected to the suction pipe 1.
7 is disposed above the suction port 21 of the lower bearing 10. Next, details of the pump section will be explained based on FIG. 3. A lower bearing 10 having a suction port 21, a cylinder 11, and an upper bearing 9 having a discharge port 22 are inserted into the mechanical box 8. In the space formed by the upper and lower bearings 9, 10 and the cylinder 11, a rotor 23, Vane 24 and spring 25 are inserted. After inserting the above items into the mechanical box 8, the support plate 12 and the mechanical box 8 are fastened together with bolts 13. As described above, leakage inside the sealed vane pump of the present invention is almost eliminated due to the surface sealing effect of the upper bearing 9, the support plate 12, the lower bearing 10, and the mechanical box 8, and that the bearing insertion hole of the mechanical box ₈ is
Since the outer diameter of the bearing and cylinder have a tolerance of _h7 , there is no center shift between the upper and lower bearings, there is no problem of the shaft hitting the shaft hole unevenly during assembly, stable pump characteristics are obtained, and durability is also improved. This is an extremely practical improvement.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a conventional completely hermetic vane pump, FIG. 2 is a partial sectional view of a completely hermetic vane pump according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of a mechanical box. 8... Mechabox, 9... Upper bearing, 10...
Lower bearing, 11... cylinder, 12... support plate,
14... Upper outer shell, 15... Lower outer shell, 23...
Rotor, 24... vane.

Claims (1)

[Scope of utility model registration request] In the space formed by the mechanical box and the support plate,
A lower bearing having a suction port, a cylinder, and an upper bearing having a discharge port are sequentially inserted, and a rotor and vanes having a plurality of vane grooves are inserted into a space formed by the cylinder and the two upper and lower bearings. The mechanical box and the supporting plate are fastened with a plurality of bolts, the upper outer shell and the lower outer shell are welded together with the supporting plate all around, the supporting plate and the upper outer shell form a magnetic chamber, and the mechanical box and the lower outer shell form a suction chamber, and a suction pipe disposed in the lower outer shell is provided above the suction port 21 of the lower bearing.