Sealing structure of centrifugal pump

Abstract

A sealing structure of a centrifugal pump comprises a pump body (4), the right side of the pump body extends rightwards to form a barrel body (5), a pump shaft (13) penetrates through the barrel body, sealing filler (11) is arranged between the barrel body and the pump shaft, a pressing sleeve (7) is arranged between the sealing filler and the barrel body, a sealing ring (6) is arranged between the pressing sleeve (7) and the barrel body, and the left end of the pressing sleeve (7) is provided with an inward flange. The cross section of a gland (9) is in a shape like a Chinese character'ji ', a protruding ring on the lower portion of the gland (9) extends into the pressing sleeve, the ring face of the protruding ring is attached to the right end of the sealing packing, the gland (9) is connected with the right end of the pressing sleeve (7) through a bolt (10), and an axial gap is formed between the gland (9) and the pressing sleeve (7). The sealing device has the beneficial effects that the bolt is tightened, the flange of the pressing sleeve and the convex ring of the gland simultaneously apply pressure to the sealing filler, the sealing filler is clamped, the radial pressure distribution of the sealing filler is basically consistent with the pressure distribution of a leakage medium along a leakage channel, and the sealing effect can be improved.

Description

Technical Field

[0001] The utility model relates to a sealing structure of a centrifugal pump. Background Art

[0002] A stuffing box is provided between the pump shaft and the pump body of a centrifugal pump. The stuffing box is filled with sealing packing, which is compressed by a gland. The sealing packing generates radial pressure, but the radial pressure along the length of the sealing packing is inconsistent. The radial pressure is maximum at the position close to the gland, and minimum at the position far from the gland. This is opposite to the pressure distribution of the leakage medium along the leakage channel (the pressure of the leakage medium is maximum at the position far from the gland). As a result, the sealing effect is low and the sealing performance decreases rapidly. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a sealing structure of a centrifugal pump, wherein the radial pressure distribution of the sealing packing is substantially consistent with the pressure distribution of the leakage medium along the leakage channel, thereby improving the sealing effect.

[0004] The technical solution of the present utility model is a sealing structure of a centrifugal pump, which includes a pump body 4, a cylinder 5 extending to the right from the right side of the pump body, a pump shaft 13 passing through the cylinder, an impeller 2 connected to the left end of the pump shaft, the impeller is located in the pump body, a sealing packing 11 is provided between the cylinder and the pump shaft, and is characterized in that a compression sleeve 7 is provided between the sealing packing and the cylinder, a sealing ring 6 is provided between the compression sleeve 7 and the cylinder, the left end of the compression sleeve 7 has an inward flange, the right side surface of the flange is in contact with the left end of the sealing packing, the cross section of the gland 9 is ""-shaped, the convex ring at the lower part extends into the compression sleeve, the annular surface of the convex ring is in contact with the right end of the sealing packing, the gland 9 is connected to the right end of the compression sleeve 7 by a bolt 10, and an axial gap is provided between the gland 9 and the compression sleeve 7.

[0005] The beneficial effect of the utility model is that when the bolts are tightened, the flange of the pressure sleeve and the convex ring of the pressure cover simultaneously apply pressure to the sealing packing to clamp the sealing packing. The radial pressure distribution of the sealing packing is basically consistent with the pressure distribution of the leakage medium along the leakage channel, which can improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural diagram of the present utility model.

[0007] Figure symbols: 1-bushing, 2-impeller, 3-pump cover, 4-pump body, 5-cylinder, 6-sealing ring, 7-pressing sleeve, 9-pressing cover, 10-bolt, 11-sealing packing, 12-spring, 13-pump shaft. DETAILED DESCRIPTION

[0008] A sealing structure of a centrifugal pump includes a pump body 4 and a pump cover 2 connected to the left side of the pump body. An impeller 2 is provided in the pump body, and the impeller 2 is connected to a pump shaft 13.

[0009] A cylinder 5 extends to the right from the right side of the pump body, and a pump shaft 13 is located in the cylinder. A sealing packing 11 is provided between the cylinder and the pump shaft, a compression sleeve 7 is provided between the sealing packing and the cylinder, and a sealing ring 6 is provided between the compression sleeve 7 and the cylinder. The left end of the compression sleeve 7 has an inward flange, and the right side of the flange is in contact with the left end of the sealing packing. The cross-section of the gland 9 is in the shape of a " ", and the convex ring at the lower part extends into the compression sleeve, and the annular surface of the convex ring is in contact with the right end of the sealing packing. The gland 9 is connected to the right end of the compression sleeve 7 by a bolt 10, and there is an axial gap between the gland 9 and the compression sleeve 7.

[0010] The sealing ring 6 is used to prevent the liquid in the pump body from leaking along the inner wall of the cylinder; there is no relative movement between the cylinder and the compression sleeve, the sealing ring will not wear out, and the service life is long.

[0011] Tighten the bolts, the flange of the gland and the convex ring of the gland apply pressure to the sealing packing at the same time, clamping the sealing packing. The radial pressure distribution of the sealing packing is basically consistent with the pressure distribution of the leakage medium along the leakage channel, which can improve the sealing effect.

[0012] When the sealing packing is worn, tighten the bolts again to restore the sealing performance.

[0013] In order to realize the automatic repair of sealing performance, a spring 12 is sleeved on the bolt, and the spring is located between the gland and the hexagonal portion of the bolt. When the sealing packing wears out, the action of the spring can automatically compress the sealing packing.

[0014] When the pump shaft rotates, the impeller on the pump shaft may shake, and unilateral friction will occur between the pump shaft and the sealing packing, which will aggravate the wear. To avoid this situation, a bushing 1 is installed on the hub of the impeller 2. The outer circle of the bushing is pressed onto the pump body. The bushing supports the impeller and prevents the impeller from shaking.

Claims

1. A sealing structure for a centrifugal pump, comprising a pump body (4), a barrel (5) extending rightward from the right side of the pump body, a pump shaft (13) passing through the barrel, an impeller (2) connected to the left end of the pump shaft, the impeller being located in the pump body, and a sealing packing (11) being provided between the barrel and the pump shaft, wherein: A compression sleeve (7) is provided between the sealing packing and the cylinder, and a sealing ring (6) is provided between the compression sleeve (7) and the cylinder. The left end of the compression sleeve (7) has an inward flange, and the right side of the flange is in contact with the left end of the sealing packing. The cross section of the gland (9) is in the shape of a """. The convex ring at the lower part of the gland extends into the compression sleeve, and the annular surface of the convex ring is in contact with the right end of the sealing packing. The gland (9) is connected to the right end of the compression sleeve (7) by a bolt (10), and an axial gap is provided between the gland (9) and the compression sleeve (7).

2. The sealing structure of a centrifugal pump according to claim 1, characterized in that: A spring (12) is sleeved on the bolt and is located between the gland and the hexagonal portion of the bolt.

3. The sealing structure of a centrifugal pump according to claim 1, wherein: A bushing (1) is sleeved on the hub of the impeller (2), and the outer circle of the bushing is press-fitted onto the pump body.

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