JPH0355838Y2 - - Google Patents

Description

[Detailed explanation of the invention] Purpose of the invention (a) Industrial application field This invention provides a sleeve tube that fits around the outer circumference of the pump shaft that passes through the main body case, and attaches the fixed part of the mechanical seal to this main body case. This relates to a shaft sealing device for a pump in which the rotary part of a mechanical seal is fixed to the outer periphery of the sleeve cylinder.

(b) Prior art and problems to be solved In general, this type of mechanical seal consists of a fixed part supported by the main body case and a rotating part fixed to the pump shaft and rotating. It consists of a positioning ring that is screwed to the shaft, and a sliding ring that is interposed between the positioning ring and the fixed part and is pressed against the fixed part by a bullet with a predetermined pressure and rotates together with the positioning ring. It is structured as follows. The life of the mechanical seal is stabilized by maintaining the surface pressure on the sliding surface due to this bullet at a predetermined surface pressure.In order to ensure the relative dimensions between the fixed part and the positioning ring, It is necessary to precisely position the ring.

Conventionally, in pumps, as a structural means for positioning, a sleeve cylinder 47 that is slidable in the axial direction is provided on the outer periphery of the pump shaft 1, as shown in FIG.
The positioning ring 41 is fixed to the sleeve tube 47, and the sliding surface pressure of the mechanical seal is set to a predetermined pressure by adjusting the axial position of the sleeve tube 47. Adjustment of the axial position of this sleeve cylinder is done by using the bearing case 1 that covers this part.
Since the sleeve cylinder 47 was directly moved through the window 16 of No. 5 and fixed at a predetermined position with a fixing screw 53, the adjustment work was troublesome and furthermore, minute adjustments were not possible. As a result, the dry contact sealing function is lost due to excessive surface pressure, or seal leakage occurs due to insufficient surface pressure.

(c) Means and operation for solving the problem The present invention moves the rotating part, which slidably contacts the inside of the fixed part of the mechanical seal supported by the main body case, in the axial direction around the outer circumference of the pump shaft. A bearing case is fixed to the outer periphery of the sleeve cylinder to be fixed freely, and a bearing case surrounding the flange formed at the end of the sleeve cylinder is fixed to the outer end surface of the main body case, and the flange is in contact with the back surface of the head. a bolt that presses outward to move the
A bolt that comes into contact with the head surface and presses the flange inward is screwed into the wall of the bearing case from the inside in the axial direction, and a window is provided that opens on the side of the bearing case. be.

When adjusting the mechanical seal, loosen the fixing screw, make the sleeve cylinder movable, and then
The flange of the sleeve cylinder is pressed in the axial direction by the head of the bolt by appropriately rotating the bolts, and the rotating part and fixed part of the mechanical seal fixed to the sleeve cylinder maintain a predetermined surface pressure. After adjusting the position of the rotating part, fix the sleeve cylinder to the pump shaft with the fixing screw, and return the bolt head to the position for an appropriate period of time so as not to contact the rotating flange. It is.

(d) Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In Fig. 1, 1 is a pump shaft that rotates through the main body case 3 of the pump, 5, 5 are rotor blades,
intermediate casing 9,9 with guide vanes 7 inside;
It is fixed to the pump shaft 1 with a key 11 inside. 13 is an inlet, 15 is a bearing case that is fixed to the outside of the main body case 3 (in the present invention, the rotor blade 5 side in the axial direction is called inside and the opposite side is called outside), and windows 16 are opened on both sides. ing. Reference numeral 17 denotes a bearing provided at the outer end of the bearing case 15, on which one end of the pump shaft 1 is rotatably supported. Reference numeral 19 denotes an oil ring that is locked in a groove 21 cut out in the upper part of the bearing 17, and its lower end is immersed in lubricating oil in an oil reservoir 23. 25 is a flange for power transmission fixed to the end of the pump shaft 1. 27 is a seal case fixed between the bearing case 15 and the main body case 3;
A mechanical seal 29 is supported on the inner diameter portion.
This seal case 27 may be formed integrally with the main body case 3. Reference numeral 31 denotes a lid portion that is fixed to the seal case 27 by screws 33,
The fixing portion 35 of 9 is hermetically clamped and locked in the axial direction. 37 is a rotating part of the mechanical seal 29, which includes a positioning ring 41 fixed to the pump shaft 1 by a fixing screw 39, and a positioning ring 41 and a fixed part 3.
The sliding ring 43 is pressed against the fixed part 35 by a spring (not shown) provided between the positioning ring 41 and the positioning ring 41, and the sliding ring 43 is inserted between the positioning ring 41 and the positioning ring 41. It is locked in the rotational direction by the ring 41 and rotates together with the positioning ring 41. Reference numeral 45 indicates an inner sleeve tube that fits and is fixed to the outer circumference of the pump shaft 1, 47 an outer sleeve tube that fits slidably on the outer circumference of the sleeve tube 45, and 49 an outer circumference of the sleeve tube 47 and a sliding ring. A seal 51 is fitted between the outer periphery of the sleeve tube 45 and the inner diameter of the sleeve tube 47, and 53 is a fixing screw that fixes the sleeve tube 47 to the sleeve tube 45. Reference numeral 54 denotes a threaded portion for adjusting the axial position of the sleeve cylinder 47, which is composed of two axial bolts 55 and 57 that are screwed into the bearing case 15, and a flange provided at the end of the sleeve cylinder 47. The back and front surfaces of the head are brought into contact with the inner and outer surfaces of the head 59, respectively, to press and move the head.

In the embodiment described above, when the pump shaft 1 rotates via the flange 25, the liquid sucked from the suction port 13 by the centrifugal force of the rotor blades 5, 5 sequentially passes through the rotor blades 5, 5, . . . and the discharge port ( (not shown). When adjusting the mechanical seal 29, first loosen the fixing screw 53, and then loosen the bolt 55.
The flange 59 is moved outward by the bolts 57, and the flange 59 is moved inward by the bolts 57.
The axial position of the sleeve cylinder 47 is adjusted. Next, the fixing screw 53 is fixed, and the heads of the bolts 55 and 57 are separated from the flange 59.

In addition, in the present invention, the fixing portion may be supported by the main body case via a seal case or the like, or may be directly supported by the main body case.

(e) Effects of the invention According to the invention, the surface pressure on the sliding surface of a mechanical seal can be accurately adjusted to a predetermined surface pressure.
Furthermore, fine adjustments can be made, and adjustments can be made by inserting a tool through the window, making adjustment work easier.
Furthermore, since the flange is pressed by the head of the bolt, fine adjustment of the rotatable sleeve cylinder is possible, and the structure is simple and can be manufactured at low cost.

Note that FIG. 2 shows a conventional example, and the same reference numerals as those shown in FIG. 1 represent the same components.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the present invention, and FIG. 2 is a side sectional view of a conventional example. 1...Pump shaft, 3...Main case, 15...
Bearing case, 16...Window part, 29...Mechanical seal, 35...Fixed part, 37...Rotating part, 47
... Sleeve cylinder, 53 ... Fixing screw, 55, 57
...Bolt, 59...Tsubabe.

Claims (1)

[Scope of utility model registration request] A sleeve cylinder 47 that fits around the outer periphery of the pump shaft 1 that passes through the main body case 3 so as to be movable in the axial direction is fixed by a fixing screw 53, and the fixed part 35 of the mechanical seal 29 is supported on the main body case 3. The rotating part 37 of the mechanical seal 29, which is slidably abutted on the inside of the fixed part 35, is fixed to the outer periphery of the sleeve cylinder 47, and a flange part formed at the end of the sleeve cylinder 47 is provided. 5
A bearing case 15 surrounding the main body case 3 is fixed to the outer end surface of the main body case 3, and a bolt 55 contacts the back surface of the head and presses and moves the collar portion 59 outward.
and a bolt 57 that comes into contact with the head surface and presses and moves the flange 59 inward. A shaft sealing device for a pump, characterized in that a window portion 16 that opens on the side surface is provided.