CN210178637U - High-temperature double-shell multistage centrifugal pump shell sealing structure - Google Patents

Abstract

The utility model discloses a high temperature double-shell multistage centrifugal pump shell seal structure, including the pump cover, the inner shell, the shell body, the rotor, axle sleeve and bush cover are established on the rotor and the axle sleeve locates between bush and the rotor, the pump cover is established on the rotor and is connected with shell body fixed connection through the bolt through the centre bore cover, the pore wall and the bush interference fit of pump cover centre bore and the corresponding position of bush, pump cover centre position extends to the inner shell direction and forms the flange, the flange coincides with the axis of pump cover, the internal diameter of flange equals with the bush external diameter, be equipped with the annular pit of mutually supporting the location with the flange on the terminal surface of inner shell towards the pump cover, pump cover and inner shell realize the tang location through flange and annular; two sealing washers are arranged between the opposite end faces of the pump cover and the inner shell, and an annular adjusting plate is arranged between the two sealing washers. In the sealing structure, the concentricity of the outer shell, the pump cover and the inner shell is high, the running stability of the pump is good, and the reliability of high-temperature sealing can be effectively improved.

Description

High-temperature double-shell multistage centrifugal pump shell sealing structure

Technical Field

The utility model relates to a centrifugal pump, in particular to high temperature double-casing multistage centrifugal pump casing seal structure.

Background

The centrifugal pump transfers the mechanical energy of prime mover to fluid by means of the action of rotating impeller on fluid, and in the course of flowing fluid from inlet to outlet of impeller, its speed energy and pressure energy are all increased, so that the fluid discharged by impeller is fed into the centrifugal pump

The body passes through the extrusion chamber, where most of the velocity energy is converted to pressure energy, which is then transported along the discharge line. As shown in fig. 1, the high-temperature double-casing multistage centrifugal pump has a low-pressure chamber at the pump inlet, and after entering an inner casing 3, a rotor 4 in the inner casing rotates to drive a rotary impeller to pressurize fluid, so that a medium-pressure chamber is formed in the inner casing, the pressurized fluid enters the high-pressure chamber and is discharged later, the high-pressure chamber is a chamber formed by the inner casing 3, a pump cover 1 and an outer casing 2, and a low-pressure chamber is arranged between a last-stage impeller end of the inner casing 3 and a pump cover, so that the high-pressure chamber and the low-pressure chamber are separated, the high-pressure chamber needs to be sealed, namely, a gap between the pump cover and the inner casing is sealed.

The enlarged view of the sealing structure of the traditional high-temperature double-shell multistage centrifugal pump is shown in figure 2, a set of complex sealing structure with an inner bushing 5 and an outer bushing 12 is usually adopted between an inner shell and a pressure-bearing pump cover to separate and seal different pressure cavities between the inner shell and an outer shell, an elastic sealing gasket I7 and a sealing gasket II 9 are adopted to absorb different thermal deformation of the inner bushing and the outer bushing, a steel plate 8 is arranged between the two sealing gaskets, and an adjusting plate 10 is arranged between the inner bushing and the sealing gasket II. Adopt metal sealing gasket I11 between pump cover and the interior bush of this structure, adopt metal sealing gasket II 13 between interior casing and the outer bush, metal sealing gasket I and metal sealing gasket II are very easily revealed because do not have the resilience when equipment temperature changes, this way of sealed I and sealed inter II of filling up between the inside and outside bush exists like this and this twice of metal sealing gasket I and metal sealing gasket II department is sealed, three sealed totally, just can destroy whole seal structure as long as one of them sealed appearance reveals. Meanwhile, the inner shell and the outer bushing 13, the inner bushing 5 and the pump cover, and the inner bushing 5 and the outer bushing 12 are positioned by matching seam allowances, the concentricity is poor, certain gaps exist, and the stable operation of the pump is influenced for the multistage high-temperature centrifugal pump.

Disclosure of Invention

The above-mentioned not enough to prior art exists, the utility model aims at providing a can effectively improve the concentricity of interior casing, shell body and pump cover and improve the stability of pump operation to can improve the high temperature double-shell multistage centrifugal pump shell seal structure of high temperature seal reliability.

The technical scheme of the utility model is realized like this:

a high-temperature double-shell multistage centrifugal pump shell sealing structure comprises a pump cover, an inner shell, an outer shell, a rotor, a shaft sleeve and a bush, wherein the shaft sleeve and the bush are sleeved on the rotor and are arranged between the bush and the rotor; and two sealing gaskets are arranged between the opposite end surfaces of the pump cover and the inner shell, and an annular adjusting plate is arranged between the two sealing gaskets.

Furthermore, an annular groove is formed in the end face, facing the inner shell, of the pump cover, the inner diameter of the annular groove is consistent with the outer diameter of the convex barrel, and the two sealing gaskets and the adjusting plate are located in the annular groove.

Further, the sealing washer is a metal winding washer.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses only set up the tang location in pump cover and interior casing, obviously reduced the quantity of tang location, and then reduced tang complex clearance to improve the concentricity between shell body, interior casing and the pump cover, improved the stability of pump operation and sealed reliability.

2. The utility model discloses a between two metal winding pads and adjusting plate direct action pump cover and interior casing, seal structure is simple to can be through adjusting the thickness size of adjusting plate, make two metal winding pads can compress tightly and play good sealed effect.

3. The existing sealing structure adopts three seals, and the utility model discloses only adopt one to seal, further improved sealed reliability.

Drawings

Fig. 1-conventional high temperature double casing multistage centrifugal pump.

Fig. 2-an enlarged view of a portion of fig. 1A.

Figure 3-the utility model discloses high temperature double-shell multistage centrifugal pump seal structure.

Fig. 4-an enlarged view of the portion of fig. 3B.

Wherein: 1-pump cover; 2-an outer shell; 3-an inner housing; 4-a rotor; 5-inner lining; 6-shaft sleeve; 7-sealing gasket I; 8-steel plate; 9-sealing gasket II; 10-an adjusting plate; 11-metal gasket i; 12-an outer liner; 13-metal seal gasket ii; 14-a bushing; 15-sealing washer I; 16-sealing washer ii.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 3 and 4, a high-temperature double-casing multistage centrifugal pump casing sealing structure comprises a pump cover 1, an inner casing 3, an outer casing 2, a rotor 4, a shaft sleeve 6 and a bush 14, wherein the shaft sleeve 6 and the bush 14 are both sleeved on the rotor 4, the shaft sleeve 6 is arranged between the bush 14 and the rotor 4, the pump cover 1 is sleeved on the rotor 4 through a central hole and fixedly connected with the outer casing 3 through a bolt, so as to seal one end of the outer shell 2 and the inner shell 3, the hole wall of the corresponding part of the pump cover 1 center hole and the lining 14 is connected with the lining 14 in an interference fit way, the center part of the pump cover 1 extends to the inner shell 3 direction to form a convex cylinder, the axis of the convex cylinder is superposed with the axis of the pump cover, the inner diameter of the convex cylinder is equal to the outer diameter of the lining 14, the end face, facing the pump cover, of the inner shell 3 is provided with an annular pit which is matched with the convex cylinder for positioning, and the pump cover 1 and the inner shell 3 realize spigot positioning through the convex cylinder and the annular pit; and two sealing gaskets are arranged between the opposite end surfaces of the pump cover and the inner shell, wherein the sealing gasket I15 is tightly attached to the inner shell, the sealing gasket II 16 is tightly attached to the inner end surface of the pump cover, and an annular adjusting plate 10 is arranged between the two sealing gaskets.

Like this, pump cover and interior casing realize the tang location, compare with traditional seal structure, only adopt a tang location structure, have improved the concentricity between shell body, interior casing and the pump cover, have reduced the clearance, have improved the operating stability of pump, have improved the seal stability of pump simultaneously.

When the length and the size of the inner shell and the outer shell deviate from actual needs, the adjusting plate is arranged between the pump cover and the inner shell, and the thickness of the adjusting plate is adjusted to ensure that the sealing washer I and the sealing washer II always have a proper compression amount, so that the sealing effectiveness is ensured. And the adjusting plate can be made of common steel sheets.

Meanwhile, the bushing and the pump cover are in interference fit, a certain gap exists between the shaft sleeve and the bushing, when the rotor rotates, the shaft sleeve can rub against the bushing under the condition of abnormal working conditions, the bushing only needs to be replaced in the later maintenance process, and the pump cover can be used for a long time.

The end face of the pump cover 1 facing the inner shell 3 is provided with an annular groove, the inner diameter of the annular groove is consistent with the outer diameter of the convex cylinder, and the two sealing gaskets and the adjusting plate are positioned in the annular groove. The annular groove can effectively position the two sealing gaskets and the adjusting plate.

The sealing washer is a metal winding washer, the metal winding washer is a semi-metal flat washer formed by spirally and compositely winding a metal belt and a non-metal belt, the semi-metal flat washer can resist high temperature and high pressure and is suitable for being used at ultralow temperature or in vacuum, and the sealing performance is stable and reliable under the conditions of frequent temperature and pressure fluctuation.

Finally, it should be noted that the above-mentioned embodiments of the present invention are only examples for illustrating the present invention, and are not limitations to the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes or variations which are introduced by the technical solution of the present invention are still within the scope of the present invention.

Claims (3)

1. A high-temperature double-shell multistage centrifugal pump shell sealing structure comprises a pump cover, an inner shell, an outer shell, a rotor, a shaft sleeve and a bush, wherein the shaft sleeve and the bush are sleeved on the rotor and are arranged between the bush and the rotor; and two sealing gaskets are arranged between the opposite end surfaces of the pump cover and the inner shell, and an annular adjusting plate is arranged between the two sealing gaskets.

2. A high-temperature double-casing multistage centrifugal pump casing sealing structure according to claim 1, wherein an annular groove is provided on the end surface of the pump cover facing the inner casing, the inner diameter of the annular groove is identical to the outer diameter of the boss, and the two sealing gaskets and the adjusting plate are located in the annular groove.

3. The high temperature double casing multistage centrifugal pump casing seal structure of claim 1, wherein said seal gasket is a metal wound gasket.

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