JPS5923896Y2 - Shaft sliding surface protection device for rotating equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sliding surface protection device for a shaft in a rotating device.

An object of the present invention is to provide a sewage pump that is durable and has a shaft sliding surface protected even when used in sewage containing slurry at a low cost.

In general, rotating equipment such as submersible pumps is fitted with a resilient sealing ring made of synthetic rubber or the like in order to protect the mechanical seal from solid matter contained in the fluid.

However, although the mechanical seal portion can be protected by this, the sliding surface between the shaft and the sealing ring is laminated with slurry.

For this reason, direct sliding contact between the sealing ring and the shaft is avoided by interposing the metal sleeve.

There are also products that have a melt-resistant metal coating on the outer circumferential surface of the cannula using methods such as plating or thermal spraying, but in either case, it is impossible to prevent the cannula itself from being layered with slurry. do not have.

However, as is well known, rotating objects such as impellers are fitted to the outer end of the shaft, so it is not easy to replace them, and it is difficult to replace them. In the case of pumps, it is considered a difficult task to raise the pump, so it is not desirable to frequently replace the sleeve.

This is why a durable protective device that does not require frequent replacement due to lamination is highly desirable.

In the sliding surface protection device for a shaft in a rotary sealer according to the present invention, a cylindrical body is fitted onto the shaft in a position corresponding to the mounting position of a fixed side sealing ring whose inner circumferential surface has elasticity. An annular body made of a super hard material having approximately the same outer diameter as the cylindrical body is fitted into the annular groove so as to form an annular groove on the outer circumferential surface of the annular body, and the outer circumferential surface of the annular body is placed on the fixed side. It is formed on a sliding sealing surface that is in constant contact with the elastic inner circumferential surface of the sealing ring in a press-like manner.

To explain the drawings of the embodiment, an annular groove 4 is formed on the outer peripheral surface of a cylindrical body 3 made of a material that is inexpensive and easy to process, and the cylindrical body 3 and the cylindrical body 3 are formed in the annular groove 4. An annular body 5 made of ultra-hard material having approximately the same outer diameter is fitted onto the shaft 2 so as to correspond to the mounting position of the fixed side sealing ring 1 whose inner peripheral surface has elasticity. Thus, the outer circumferential surface of the annular body 5 is formed into a sliding sealing surface 6 that is in constant contact with the resilient inner circumferential surface of the stationary side sealing ring 1 in a pressing manner.

When it is desired to obtain a protective tube having a plurality of sliding sealing surfaces 6...6, the cylindrical body 3 shown in FIG. 1 may be integrally molded from synthetic resin or the like.

In the one shown in FIG. 2, the annular body 5 made of ultra-hard material is
Annular grooves 4 are formed at key points for fitting the parts.

Note that the radial spacing ring 3a and the axial spacing ring 3
b may be made into an integral structure in advance.

In the one shown in FIG. 3, ring grooves 4 for fitting an annular body 5 made of ultra-hard material are formed at key points by a combination of a guide tube 3g fitted to the shaft 2 and an axial spacing ring 3b. The connecting portions of each member are joined by welding, brazing, bonding, etc. to form an integral structure.

The one in Fig. 4 is a cylindrical unit in which an annular groove 4 is formed on the outer surface and an annular body 5 made of super hard material is fitted into the annular groove 4.
・3C is integrated into a metal tubular body 3d by inserting and fixing the required number of parts, and the specific method of inserting and fixing is a screw-in method as shown in A in the same figure or a screw-in method as in B in the same figure. Examples include the method of wearing.

The one in Fig. 5 is one in which a required number of cylindrical units) 3C...3C are arranged in the axial direction and are fastened together with rod-shaped fasteners 3e...3e, and can be fastened together using a caulking pin method or bolts. Clamps, etc. are used as fastening materials.

In the case shown in Fig. 6, a fitting or screwing type engaging/disengaging structure 3f is attached to the side end surface of each unit) 3C...3C, and as shown in Fig. 6, the fixed side sealing ring 1・
...Arbitrary number of cylindrical units corresponding to the number of installed 1) 3C
. . 3C are connected in the axial direction and combined together as shown in FIG.
The sliding sealing surfaces 6...6 are obtained by fitting the sliding sealing surfaces 6 to 6.

As described above, the sliding sealing surface 6 is formed by pressure contact between the resilient inner circumferential surface of the stationary side sealing ring 1 and the outer circumferential surface of the annular body 5 made of ultra-hard material.
It is durable because it forms a .

It goes without saying that ultra-hard materials such as so-called cemented carbide metals have excellent wear resistance, but at the same time they have the drawbacks of being extremely difficult to process and extremely expensive.

Therefore, the entire protective device cannot be made of ultra-hard material such as cemented carbide metal.

Further, since the outer diameter surface of the protective device is opposed to the elastic sealing ring, there is no problem even if there is some variation in the finished dimensions, but large tolerances cannot be allowed for the inner diameter and axial length.

In the device of this invention, the inner diameter and shaft length parts that require high-precision finishing are made of inexpensive and easily workable materials, and only the main parts of the outer diameter surface that require wear resistance are made of ultra-hard materials. This has the advantage of satisfying both accuracy and durability and being relatively low cost.

[Brief explanation of the drawing]

The drawings are longitudinal sectional side views of essential parts showing embodiments of the device of the present invention, in which FIG. 1 shows an example in which an annular body made of ultra-hard material is fitted into an annular groove of a cylindrical body, and FIG. Figure 3 shows an example in which an annular body made of a super hard material is fitted into an annular groove formed by a guide tube and an axial spacing ring, and Fig. 3 shows a guide tube fitted to a shaft and an axial spacing ring. An example is shown in which an annular body made of super hard material is fitted into an annular groove formed by a ring, and Fig. 4 shows a case in which a required number of cylindrical units fitted with an annular body made of super hard material are inserted and fixed into the tubular body. Fig. 5 shows an example in which a required number of cylindrical units are connected together with a rod-like fastening material, and Fig. 6 shows a case in which a required number of cylindrical units are connected together with a rod-like fastening material. This shows an example of connecting the required number of units in the axial direction. 1 is a fixed side sealing ring, 2 is a shaft, 3 is a cylindrical body, 3a is a radial spacing ring, 3b is an axial spacing ring, 3C
is a cylindrical unit, 3d is a tubular body, 3e is a rod-shaped fastener, 3
3g is a guide tube, 4 is an annular groove, 5 is an annular body made of ultra-hard material, and 6 is a sliding sealing surface.

Claims (1)

[Scope of utility model registration request] An annular groove 4 is formed on the outer circumferential surface of the cylindrical body 3 fitted to the shaft 2 to correspond to the mounting position of the fixed side sealing ring 1 whose inner circumferential surface has elasticity. A super-hard annular body 5 having an outer diameter approximately the same as that of the cylindrical body 3 is fitted into the groove 4, and the outer circumferential surface of the annular body 5 is pressed against the elastic inner circumferential surface of the fixed side sealing ring 1. A sliding surface protection device for a shaft in rotating equipment, which is formed on a sliding sealing surface 6 that is in constant contact with the shape of the shaft.