Cavity cover sealing structure of diaphragm cavity of high-pressure coal slurry pump

Abstract

The utility model discloses a high-pressure coal slurry pump diaphragm cavity cover sealing structure which comprises a cavity and a cavity cover which is matched with the cavity and fixedly connected with the cavity through a bolt, a cavity cover protrusion matched with a cavity opening is arranged on the face, facing the cavity, of the cavity cover, the cavity cover protrusion is embedded into the cavity, and the cavity cover is arranged in the cavity. A sealing ring and a supporting ring are sequentially embedded in the outer circumferential face of the cavity cover protrusion, a circle of cavity sealing layer is correspondingly arranged on the inner circumferential face of the cavity, the outer circumferential face of the sealing ring and the outer circumferential face of the supporting ring are attached to the cavity sealing layer, an annular groove is further formed in the position, on one side of the cavity cover, of the outer circle of the cavity cover protrusion, an O-shaped ring is embedded in the annular groove, and the O-shaped ring abuts against the end face of the cavity. According to the utility model, the service life of equipment is prolonged, the maintenance frequency is reduced, fault shutdown loss caused by damage of the hose and the diaphragm is reduced, shutdown caused by leakage damage of the hose and the diaphragm is avoided, and spare parts and maintenance cost of the hose and the diaphragm are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm cavity sealing of a high-pressure coal slurry pump, in particular to a diaphragm cavity cover sealing structure of a high-pressure coal slurry pump. Background Art

[0002] The high-pressure coal slurry pump is a double-acting plunger diaphragm pump, which is a key equipment for conveying water-coal slurry to the gasifier for pressurized gasification reaction. When assembling the cavity cover, a sealing ring is set between the circular diaphragm cavity of the high-pressure coal slurry pump and the circumferential contact surface of the cavity cover, and then the cavity cover is locked with the diaphragm cavity by bolts. However, in actual operation, due to corrosion, the sealing surface of the diaphragm cavity is damaged, the seal fails, leakage often occurs, causing damage to the hose, and even damage to the diaphragm, resulting in failure and shutdown. Utility Model Content

[0003] Purpose of the utility model: In view of the above-mentioned problems, the purpose of the utility model is to provide a sealing structure for the diaphragm chamber cover of a high-pressure coal slurry pump, which can further prevent sealing failure caused by damage to the sealing structure while ensuring the sealing effect, thereby ensuring production.

[0004] Technical solution: A high-pressure coal slurry pump diaphragm chamber cover sealing structure, including a cavity and a cavity cover adapted to the cavity and fixedly connected by bolts, a cavity cover protrusion matching the cavity opening is provided on the side of the cavity cover facing the cavity, the cavity cover protrusion is embedded in the cavity, and a sealing ring and a support ring are embedded in sequence on the outer circumferential surface of the cavity cover protrusion, and a circle of cavity sealing layer is correspondingly provided on the inner circumferential surface of the cavity, and the outer circumferential surfaces of the sealing ring and the support ring are respectively fitted with the cavity sealing layer, and an annular groove is also provided on one side of the cavity cover and on the outer ring of the cavity cover protrusion, in which an O-ring is embedded, and the O-ring is in contact with the end face of the cavity.

[0005] Furthermore, the cavity sealing layer is a corrosion-resistant layer sprayed with corrosion-resistant material.

[0006] Furthermore, the O-ring is a nitrile rubber ring with a hardness of 90 to 95° Shore A.

[0007] Optimally, the abutting surface between the cavity and the O-ring is a smooth plane that is concave relative to the end surface of the cavity, with a depth of 0.05 mm to 0.07 mm and a width of 10 mm to 12 mm.

[0008] Optimally, the width of the O-ring is smaller than the width of the smooth surface.

[0009] The setting of the smooth plane forms a plane seal between the cavity body and the cavity cover, ensuring a thorough sealing effect at the cavity opening and preventing the seal from failing due to corrosion.

[0010] Furthermore, the cavity opening of the cavity is a conical opening with an axial inclination angle of 15° to 20°.

[0011] The tapered opening ensures that the sealing ring and the support ring combined seal can smoothly enter the cavity opening, while not forming an excessively large gap between the circular protrusion of the cavity cover and the cavity body.

[0012] Beneficial effects: Compared with the prior art, the advantages of the utility model are: a combined seal of a cavity sealing layer, a sealing ring, and a support ring is formed inside the cavity. The cavity sealing layer can prevent the corresponding position inside the cavity from affecting the sealing effect of the sealing ring and the support ring due to corrosion, and solve the leakage problem between the diaphragm cavity and the cavity cover of the high-pressure coal slurry pump; an annular O-ring groove is opened on the circular raised side of the cavity cover, and a corresponding O-ring is arranged inside, so that a plane seal is formed between the cavity and the cavity cover, and the sealing effect at the cavity mouth is ensured to be thorough. In addition, two effective seals are formed between the cavity and the cavity cover, which is not easy to cause sealing failure due to corrosion, thereby increasing the service life of the equipment, reducing the frequency of maintenance, reducing the loss of shutdown caused by failure due to damage to the hose and diaphragm, avoiding shutdown caused by leakage damage to the hose and diaphragm, and saving spare parts and maintenance costs for the hose and diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at B in the middle;

[0015] In the figure, 1. cavity; 2. cavity cover; 3. sealing ring; 4. support ring; 5. bolt; 6. O-ring; 7. annular groove; 8. cavity cover protrusion; 9. smooth plane; 10. cavity sealing layer. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0017] A high-pressure coal slurry pump diaphragm chamber cover sealing structure, such as Figure 1 , 2 As shown, it comprises a cavity 1 and a cavity cover 2 adapted to the cavity 1 and fixedly connected by bolts 5, wherein a plurality of bolts 5 are provided and distributed at intervals symmetrically with respect to the center. A cavity cover protrusion 8 matching with the opening of the cavity 1 is provided on the surface of the cavity cover 2 facing the cavity 1, and the outer diameter of the cavity cover protrusion 8 is slightly smaller than the inner diameter of the cavity 1. After the cavity cover is closed, the cavity cover protrusion 8 is inserted into the opening of the cavity 1.

[0018] The outer circumference of the cavity cover protrusion 8 is sequentially embedded with a sealing ring 3 and a supporting ring 4, and the inner circumference of the cavity 1 is correspondingly provided with a cavity sealing layer 10, which is a corrosion-resistant layer sprayed with corrosion-resistant material, and the outer circumferences of the sealing ring 3 and the supporting ring 4 are respectively fitted with the cavity sealing layer 10. During processing, 0.1 mm thickness can be cut off at the corresponding position of the inner circumference of the cavity 1, and the corrosion-resistant material can be coated by laser melting, and then processed to the original size to form the cavity sealing layer 10 to prevent the sealing surface from failing due to corrosion.

[0019] On one side of the cavity cover 2, an annular groove 7 is provided on the outer ring of the cavity cover protrusion 8, in which an O-ring 6 is embedded, and the O-ring 6 abuts against the end face of the cavity 1. The O-ring 6 is a nitrile rubber ring with a hardness of 90 to 95° Shore A. The abutting surface between the cavity 1 and the O-ring 6 is a circle of smooth plane 9 concave relative to the end face of the cavity 1, with a depth of 0.05mm to 0.07mm and a width of 10mm to 12mm. The width of the O-ring 6 is smaller than the width of the smooth plane 9. In one embodiment, the size of the annular groove 7 is 9×5.72mm, the bottom corner of the annular groove 7 is an arc of R0.5, and the upper part is an arc of R0.2. The corresponding O-ring 6 in the annular groove 7 has a specification of φ524×8.

[0020] The opening of the cavity 1 is a conical opening with an axial inclination angle of 15° to 20°, which ensures that the combined seal of the sealing ring 3 and the support ring 4 can smoothly enter the cavity opening without forming an excessively large gap between the cavity cover protrusion 8 and the cavity 1.

[0021] The sealing ring 3, the supporting ring 4 and the cavity sealing layer 10 form the first seal. By changing the sealing surface material, the corrosion resistance is enhanced to ensure the sealing effect. The O-ring 6 and the smooth plane 9 form the second plane seal. The two seals further enhance the sealing effect at the cavity opening and are not prone to sealing failure due to corrosion.

Claims

1. A sealing structure for a diaphragm chamber cover of a high-pressure coal slurry pump, comprising a chamber body (1) and a chamber cover (2) adapted to the chamber body (1) and fixedly connected to the chamber body (1) by bolts (5), characterized in that: A cavity cover protrusion (8) is provided on one surface of the cavity cover (2) facing the cavity (1) and is matched with the opening of the cavity (1). The cavity cover protrusion (8) is embedded in the cavity (1). A sealing ring (3) and a support ring (4) are embedded in sequence on the outer peripheral surface of the cavity cover protrusion (8). A circle of cavity sealing layer (10) is correspondingly provided on the inner peripheral surface of the cavity (1). The outer peripheral surfaces of the sealing ring (3) and the support ring (4) are respectively in contact with the cavity sealing layer (10). An annular groove (7) is also provided on one side of the cavity cover and on the outer ring of the cavity cover protrusion (8), in which an O-ring (6) is embedded. The O-ring (6) is in contact with the end surface of the cavity (1).

2. A sealing structure for a diaphragm chamber cover of a high-pressure coal slurry pump according to claim 1, characterized in that: The cavity sealing layer (10) is a corrosion-resistant layer sprayed with corrosion-resistant material.

3. The sealing structure of the diaphragm chamber cover of a high-pressure coal slurry pump according to claim 1, characterized in that: The O-ring (6) is a nitrile rubber ring with a hardness of 90-95° Shore A.

4. A sealing structure for a diaphragm chamber cover of a high-pressure coal slurry pump according to claim 1 or 3, characterized in that: The abutting surface between the cavity (1) and the O-ring (6) is a circle of smooth plane (9) which is concave relative to the end surface of the cavity (1), has a depth of 0.05 mm to 0.07 mm, and a width of 10 mm to 12 mm.

5. A sealing structure for a diaphragm chamber cover of a high-pressure coal slurry pump according to claim 4, characterized in that: The width of the O-ring (6) is smaller than the width of the smooth surface (9).

6. The sealing structure of the diaphragm chamber cover of a high-pressure coal slurry pump according to claim 1, characterized in that: The cavity opening of the cavity (1) is a conical opening with an axial inclination angle of 15° to 20°.

Images