CN212225582U - Mechanical seal for centrifugal slurry pump and shaft seal formed by mechanical seal - Google Patents

Abstract

The utility model discloses a mechanical seal for centrifugal slurry pump and shaft seal who constitutes thereof, including rotating ring, quiet ring, the sealed face of rotating ring and quiet ring sets up respectively to evagination spherical arc face and indent arc inclined plane, and two sealed faces mutually support. The installation is convenient, and the leakage caused by the unparallel of the moving ring and the static ring can be avoided.

Description

Mechanical seal for centrifugal slurry pump and shaft seal formed by mechanical seal

Technical Field

The utility model relates to a centrifugal pump shaft seals the field, especially relates to centrifugal pump shaft seal.

Background

The mechanical seal of the anti-corrosion centrifugal slurry pump is shown in figure 1, the configuration of a silicon carbide moving ring to a silicon carbide static ring is often selected, the configuration of the moving ring and the static ring can meet the abrasive requirement of the centrifugal slurry pump and can also meet the anti-corrosion requirement, but the mechanical seal of the silicon carbide moving ring to the silicon carbide static ring belongs to a hard-to-hard mechanical seal, the installation requirement is particularly high, the working contact surfaces of the moving ring and the static ring are slightly unparallel, the working surfaces of the moving ring and the static ring cannot be tightly combined, slurry can be leaked from the working surfaces which are not tightly combined, or a small amount of slurry enters a sealing working mirror surface, the sealing end surfaces of the moving ring and the static ring are rubbed, the tightly combined mirror surface of the moving ring and the.

In the prior art, the anti-corrosion centrifugal slurry pump is usually made of non-metal materials such as plastics and rubber, and although the materials have good wear resistance and corrosion resistance, the materials have the defect of easy plastic deformation, so that the pump body and the mechanical seal are subjected to accumulative deformation during installation, and further the non-coaxiality and the non-parallelism with the main shaft are increased. And the working surfaces of the movable ring and the static ring of the mechanical seal are not tightly sealed, so that the installation difficulty of the mechanical seal with the movable ring and the static ring made of hard materials is increased. Generally, the movable ring and the static ring are matched with each other till the gap is over 0.05mm, and the sealing surface is dripped, so that the mechanical seal of the centrifugal pump is difficult to install. The reason for the damage and the leakage of the mechanical seal is mainly caused by that the installation parallelism of the working faces of the seal dynamic ring and the seal static ring cannot meet the requirement. Accordingly, there remains a need for improved improvements in improving the installation performance of centrifugal slurry pump seals.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to above-mentioned problem, provide a simple to operate, can not produce the mechanical seal of the centrifugal stuff pump who leaks because of rotating ring, quiet ring nonparallel.

For realizing the purpose of the utility model, the following technical proposal is provided: the mechanical seal for the centrifugal slurry pump comprises a movable ring and a stationary ring, and is characterized in that the sealing surfaces of the movable ring and the stationary ring are respectively arranged into an outer convex spherical cambered surface and an inner concave arc inclined surface, and the two sealing surfaces are mutually matched.

Preferably, the moving ring and the stationary ring are made of hard materials.

Preferably, the hard material is one or a combination of silicon carbide, ceramic and hard alloy.

Preferably, the inner concave arc inclined plane of the static ring is arranged into two spaced channels.

Preferably, the outermost periphery of the sealing end face of the movable ring is provided with a web for reducing pressure. The centrifugal force of the movable ring is utilized to reduce the pressure of fluid on the sealing surface part of the movable ring and the static ring of the mechanical seal, so that the purpose of further prolonging the service life of the mechanical seal is achieved.

For realizing the purpose of the utility model, the utility model provides another technical scheme: the utility model provides a shaft seal that mechanical seal constitutes, shaft seal installs on the centrifugal pump main shaft, is equipped with the axle sleeve on the main shaft, its characterized in that shaft seal includes seal box subassembly, mechanical seal, seal box subassembly and pump case rigid coupling, and the rotating ring is fixed in on the axle sleeve, and the seal box subassembly includes seal box, seal box back lid, seal box protecgulum, and mechanical seal's quiet ring top pushing assembly is installed in the seal box subassembly.

Preferably, the stationary ring pushing member is a spring seat and an internal compression spring.

Preferably, the shaft sleeve is a composite of a metal material and a non-metal material.

For realizing the utility model discloses the purpose provides the third kind technical scheme: a shaft seal composed of mechanical seal is installed on the main shaft of centrifugal pump, which is equipped with shaft sleeve, and it is characterized in that the shaft seal includes seal box component and mechanical seal, the mechanical seal includes static ring and dynamic ring, the seal box component is fixed on the pump shell, the dynamic ring is fixed on the shaft sleeve, the dynamic ring is in the pump cavity and contacts with the feed liquid, the seal box component includes seal box, seal box pressing back cover which is separated from or integrated with the seal box, static ring pushing elastic ring which is placed in the seal box, two ends of the static ring pushing elastic ring are compressed between the seal box pressing back cover and the static ring, the static ring pushing elastic ring is in elastic compression state, the static ring friction amplitude and the dynamic ring friction amplitude are in contact seal, the seal end face of seal box and pump shell is fixed with rigid partition board, the inner hole peripheral face of rigid partition board is in contact seal with the peripheral face of static ring, the peripheral face of static ring pushing elastic ring is in contact, The sealing box presses the back cover, the rigid clapboard and the static ring to surround a liquid storage cavity.

Preferably, a liquid through hole is formed in the static ring, one end of the liquid through hole is communicated with the liquid storage ring groove, and the other end of the liquid through hole is communicated with the liquid storage cavity.

The utility model discloses beneficial effect: the utility model discloses a machine seals has fine anti nonparallel performance, and when the nonparallel degree reached 2-3mm between rotating ring, the quiet ring, the machine seals still can normally work, and will leak as long as the nonparallel degree reaches 0.15mm machine seals among the prior art.

Because the utility model discloses a machine seals has good anti non-parallelism, has consequently reduced installer's technical requirement, has made things convenient for the installation and the maintenance of machine seal.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1.

Fig. 2 is a schematic structural view of the rotating ring in fig. 1.

Fig. 3 is a schematic view of the stationary ring structure in fig. 1.

Fig. 4 is a schematic structural diagram of embodiment 2.

FIG. 5 is a schematic structural diagram of embodiment 3.

FIG. 6 is a schematic structural diagram of example 4.

FIG. 7 is a schematic structural view of example 5.

FIG. 8 is a schematic structural view of example 6.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

Example 1: as shown in fig. 1, 2 and 3, a shaft seal composed of mechanical seals is installed on a main shaft 4 of a centrifugal pump, the main shaft 4 is provided with a shaft sleeve 3, the shaft seal comprises a seal box assembly and mechanical seals, the seal box assembly is fixedly connected with a pump shell, a movable ring 1 is fixed on the shaft sleeve 3, the seal box assembly comprises a seal box 7, a seal box rear cover 8 and a seal box front cover 13, a seal ring 14, a spring seat 6 and a spring 5 in the spring seat 6 are sequentially arranged in the seal box 7 from left to right, a seal part 11 in contact and seal with the surface of the stationary ring is arranged on the seal ring 14, the tail end of the spring seat 6 is provided with a cooling water seal ring 10, the seal ring 14, the spring seat 6 and the spring 5 in the spring seat 6 are pressed in the seal box 7 by the seal box front cover 13 and the seal box rear cover 8 to form a packaging type, a cooling water inlet 9 is arranged on the seal box 7, the sealing surface of, the sealing surface of the static ring 2 is an inner concave arc inclined surface 2.1, the two sealing surfaces are matched with each other, the moving ring 1 and the static ring 2 are made of hard materials, the hard materials are one or a combination of silicon carbide, ceramics and hard alloy, the outermost periphery of the sealing end surface of the moving ring 1 is provided with a decompression spoke 1.2, and the shaft sleeve 4 is made of metal materials and nonmetal materials.

Example 2: as shown in figure 4, the shaft seal composed of a mechanical seal is arranged on a main shaft 4 of a centrifugal pump, the main shaft 4 is provided with a shaft sleeve 3, the shaft seal comprises a seal box component and a mechanical seal, the mechanical seal comprises a static ring 1 and a movable ring 2, the seal box component is fixedly connected with a pump shell, the movable ring 1 is fixed on the shaft sleeve 3, the movable ring 1 is positioned in a pump cavity and is contacted with a conveying liquid, the seal box component comprises a seal box 7, a seal box pressing rear cover 15 which is separated from or integrated with the seal box 7, and a static ring pushing elastic ring 5.1 which is arranged in the seal box 7, two ends of the static ring pushing elastic ring 5.1 are compressed between the seal box pressing rear cover 15 and the static ring 1, the static ring pushing elastic ring 5.1 is in an elastic compression state, so that a friction amplitude of the static ring 1 is contacted and sealed with a friction amplitude of the pump shell 2, a rigid clapboard 16 is fixedly connected on the seal end surface of the seal box 7 and the seal end surface of the, the static ring 1 pushes the outer peripheral surface of the elastic ring 5.1, the sealing box pressing rear cover 15, the rigid partition plate 16 and the static ring 1 to enclose a liquid storage cavity.

Example 3: referring to example 2, as shown in fig. 5, the rest features are unchanged, and the static ring pushing elastic ring is in a straight cylinder shape 5.2.

Example 4: referring to example 2, as shown in fig. 6, the remaining features are unchanged, and the stationary ring urging elastic ring has a corrugated shape 5.3.

Example 5: referring to embodiment 2, as shown in fig. 7, with the rest features unchanged, the inner concave arc inclined planes of the stationary ring are arranged into two spaced lines, two inner concave arc inclined planes 2.1.1 and 2.1.2, an annular groove 2.2 is reserved between the two inner concave arc inclined planes, a liquid through hole 2.4 is formed in the stationary ring 1, one end of the liquid through hole 2.4 is communicated with the annular ring groove 2.2, and the other end is communicated with the liquid storage cavity.

Establish in seal box 7 and deposit sap cavity 11, set up feed liquor hole 7.1 on the seal box, establish coolant liquid source 12 outside the seal box, the liquid accessible feed liquor hole 7.1 of coolant liquid source gets into deposits sap cavity 11, and the rethread passes through liquid hole 2.4 and gets into annular groove 2.2, lubricates the working face that the machine sealed. With this cooling system it is achieved that only a small amount of water has to be consumed to make the seal non-burning.

Example 6: referring to embodiment 1, as shown in fig. 8, with the remaining features unchanged, a liquid storage chamber 11 is provided in the seal box 7, a liquid inlet hole 7.1 is provided on the seal box 7, a cooling liquid source 12 is provided outside the seal box 7, liquid of the cooling liquid source can enter the liquid storage chamber 11 through the liquid inlet hole 7.1 and then enter the annular groove 2.2 through the liquid through hole 2.4, a working surface of the mechanical seal is lubricated, a liquid outlet hole 7.2 is further provided on the seal box 7, and the liquid inlet hole 7.1, the liquid outlet hole 7.2, the liquid storage chamber 11 and the cooling liquid source 12 constitute a cooling cycle.

The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Claims (10)

1. The mechanical seal for the centrifugal slurry pump comprises a movable ring and a stationary ring, and is characterized in that the sealing surfaces of the movable ring and the stationary ring are respectively arranged into an outer convex spherical cambered surface and an inner concave arc inclined surface, and the two sealing surfaces are mutually matched.

2. The mechanical seal of claim 1, wherein the rotating ring and the stationary ring are made of a hard material.

3. A mechanical seal for centrifugal slurry pumps according to claim 2 wherein the hard material is one or a combination of silicon carbide, ceramic, cemented carbide.

4. The mechanical seal for centrifugal slurry pumps as recited in claim 1, wherein the inner concave arc slopes of the stationary ring are provided in two spaced-apart rows.

5. The mechanical seal for centrifugal slurry pumps as claimed in claim 1, wherein the outermost periphery of the seal end face of the rotating ring is provided with a web for pressure reduction.

6. A shaft seal composed of mechanical seals according to any one of claims 1 to 5, the shaft seal is mounted on a main shaft of a centrifugal pump, and a shaft sleeve is arranged on the main shaft, the shaft seal is characterized in that the shaft seal comprises a seal box assembly and a mechanical seal, the seal box assembly is fixedly connected with a pump shell, a rotating ring is fixed on the shaft sleeve, the seal box assembly comprises a seal box, a seal box rear cover and a seal box front cover, and a static ring pushing assembly of the mechanical seal is mounted in the seal box assembly.

7. The mechanical seal of claim 6, wherein the stationary ring pusher is a spring seat and an internal compression spring.

8. The mechanical seal for centrifugal slurry pumps of claim 6 wherein the bushing is a composite of metallic and non-metallic materials.

9. A shaft seal composed of mechanical seals according to any one of claims 1 to 5, the shaft seal is installed on a main shaft of a centrifugal pump, the main shaft is provided with a shaft sleeve, the shaft seal comprises a seal box assembly and a mechanical seal, the mechanical seal comprises a static ring and a dynamic ring, the seal box assembly is fixedly connected with a pump shell, the dynamic ring is fixed on the shaft sleeve and is positioned in a pump cavity to be contacted with a conveying liquid, the seal box assembly comprises a seal box, a seal box pressing rear cover which is arranged separately or integrally with the seal box, and a static ring pushing elastic ring which is arranged in the seal box, two ends of the static ring pushing elastic ring are compressed between the seal box pressing rear cover and the static ring, the static ring pushing elastic ring is in an elastic compression state, so that a static ring friction amplitude is contacted and sealed with the dynamic ring friction amplitude, a rigid clapboard is fixedly connected on the seal end face of the seal box and the pump shell, and the inner hole of the rigid clapboard is, the static ring pushes the peripheral surface of the elastic ring, the sealing box pressing rear cover, the rigid clapboard and the static ring to form a liquid storage cavity.

10. The shaft seal of claim 9, wherein the stationary ring has a fluid hole therein, one end of the fluid hole being connected to the fluid storage groove and the other end being connected to the fluid storage cavity.

Images