Liquid injection device of compressor

Abstract

The utility model belongs to the technical field of compressor cleaning devices, and particularly relates to a compressor liquid injection device which comprises a spray head assembly, a sealing assembly and a ball valve. The spray head assembly comprises a head end flange, a valve, a non-standard flange and a liquid injection pipe; the sealing assembly comprises a sealing body, a sealing nut and an internal sealing ring set, and the non-standard flange is connected with a middle flange connecting hole of the sealing body through a set of long rods; flange connecting holes are formed in the two ends of the ball valve, and the flange connecting hole in the tail end of the sealing body is in bolted connection with the flange connecting hole of the ball valve; the head end of the liquid injection pipe sequentially penetrates through the sealing body and the ball valve to be inserted into the compressor for liquid injection.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressor cleaning devices, and particularly relates to a compressor liquid injection device. Background Art

[0002] Centrifugal compressors occupy an important position in various industrial sectors, especially in petrochemical, metallurgy, natural gas transportation, refrigeration and power industries.

[0003] Among them, the product gas (including cracked gas in large ethylene plants and cracked gas and product gas in large olefin production) compressor, because its medium contains olefins, high molecular hydrocarbons, peroxides, sulfides and nitrogen oxides, these substances will undergo polymerization reaction under certain temperature and pressure, which is the so-called coking phenomenon. The coking material is easy to block the impeller, partition, flow channel and seal in the casing. At the same time, some droplets will flush the impeller with the flow of gas, which will not only affect the aerodynamic performance of the compressor, but also its mechanical properties and service life. Therefore, in the production process, water injection or organic solvent oil injection is usually used to avoid or limit coking. Therefore, it is necessary to develop a liquid injection device for the compressor to inject liquid into the compressor. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a compressor liquid injection device, including a nozzle assembly, a sealing assembly and a ball valve.

[0005] The nozzle assembly includes a head end flange, a valve, a non-standard flange and a liquid injection pipe; wherein the head end flange is welded to the valve and is an integral structure, including a flange connection part and a reducing part, and a coaxial through hole is arranged inside;

[0006] The sealing assembly comprises a sealing body, a sealing nut and an internal sealing ring group, wherein the sealing body is integrally arranged on the outer periphery of the liquid injection tube, and the front end is sealed with the liquid injection tube through the sealing nut; flange connection holes are distributed in the middle and the tail end; the internal sealing ring group is arranged between the head end of the sealing body and the liquid injection tube; the internal sealing ring group comprises a first sealing ring, an intermediate sealing ring and a second sealing ring, and a plurality of intermediate sealing rings are arranged in a V shape and are arranged in close contact with each other; the first sealing ring has a V-shaped recess on the contact surface with the intermediate sealing ring, and the second sealing ring has a V-shaped protrusion on the contact surface with the intermediate sealing ring, and the first sealing ring and the second sealing ring fix the plurality of intermediate sealing rings; a clamping groove is arranged on the outer end surface of the second sealing ring, and a circle of sealing rings is placed in the clamping groove, and the clamping groove has a vertical surface and an inclined surface;

[0007] The non-standard flange is connected to the middle flange connection hole of the sealing body through a set of long rods;

[0008] The ball valve has flange connection holes at both ends, and the flange connection hole at the tail end of the sealing body is bolted to the flange connection hole of the ball valve; the head end of the injection pipe passes through the sealing body and the ball valve in turn and is inserted into the compressor for injection.

[0009] Furthermore, the connection hole on the non-standard flange and the flange connection hole in the middle of the sealing body are both round through holes with smooth inner walls, and the long rod passes through the outer sides of the round through holes to achieve fixed connection through nuts and washers.

[0010] Furthermore, it also includes a flange connection group, which is arranged between the ball valve and the compressor.

[0011] The connection method of the sealing body and the non-standard flange in this technical solution. The original sealing body is a threaded hole, which is changed to a through hole, and nuts and washers are added to make assembly more convenient; the connection size of the throttle ring and the sealing ring is changed, the inclination angle is increased on the throttle ring, and the inner diameter size of the sealing ring is reduced. The connection is tighter and not easy to loosen; the flange and the reducer are changed from a welded split structure to an integrated structure, which can well ensure the coaxiality requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model.

[0013] Figure 2 It is a schematic diagram of the structure of the internal sealing ring group of the utility model.

[0014] Figure 3 It is a schematic diagram of the connection hole between the non-standard flange and the middle flange of the sealing body.

[0015] Figure 4 is a schematic structural diagram of a second sealing ring;

[0016] Figure 5 It is a structural diagram of the head end flange.

[0017] 1. Head end flange; 2. Valve; 3. Non-standard flange; 4. Injection pipe; 5. Sealing body; 6. Sealing nut; 7. Middle flange connecting hole; 8. First sealing ring; 9. Middle sealing ring; 10. Second sealing ring; 11. Slot; 12. Sealing ring; 13. Long rod; 14. Connecting hole; 15. Ball valve; 16. Pressing ring. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] refer to Figure 1-5 The utility model provides a compressor liquid injection device, including a nozzle assembly, a sealing assembly and a ball valve 15.

[0020] The nozzle assembly includes a head end flange 1, a valve 2, a non-standard flange 3 and a liquid injection pipe 4; wherein the head end flange 1 is welded to the valve 2 and is an integral structure, including a flange connection part and a reducing part, and a coaxial through hole is arranged inside;

[0021] A sealing assembly, comprising a sealing body 5, a sealing nut 6 and an internal sealing ring group, wherein the sealing body 5 is integrally arranged on the outer periphery of the injection tube 4, and the front end is sealed with the injection tube 4 through the sealing nut 6; flange connection holes are distributed in the middle and the tail end; the internal sealing ring group is arranged between the head end of the sealing body 5 and the injection tube 4; the internal sealing ring group comprises a pressure ring 16, a first sealing ring 8, an intermediate sealing ring 9 and a second sealing ring 10, wherein a plurality of intermediate sealing rings 9 are arranged in a V shape and are arranged in close contact with each other; the contact surface of the first sealing ring 8 with the intermediate sealing ring 9 has a V-shaped recess, and the contact surface of the second sealing ring 10 with the intermediate sealing ring 9 has a V-shaped protrusion, and the first sealing ring 8 and the second sealing ring 10 fix the plurality of intermediate sealing rings 9; a card groove 11 is arranged on the outer end surface of the second sealing ring 10, and a circle of sealing ring 12 is placed in the card groove 11, and the card groove 11 has a vertical surface and an inclined surface (inclination);

[0022] The non-standard flange 3 is connected to the middle flange connection hole 7 of the sealing body 5 through a set of long rods 13;

[0023] The ball valve 15 has flange connection holes at both ends, and the flange connection hole at the tail end of the sealing body 5 is bolted to the flange connection hole of the ball valve 15; the head end of the injection pipe 4 passes through the sealing body 5 and the ball valve 15 in sequence and is inserted into the compressor for injection. When it is not necessary to inject liquid, the ball valve 15 is closed.

[0024] As an improvement of the solution, the connection hole 14 on the non-standard flange 3 and the flange connection hole 7 in the middle of the sealing body 5 are both round through holes with smooth inner walls, and the long rod 13 passes through the outside of the round through holes to achieve fixed connection through nuts and washers.

[0025] As an improvement of the solution, a flange connection group is also included. The flange connection group is arranged between the ball valve 15 and the compressor and can be arranged for connection as needed.

[0026] The original sealing body 5 and the non-standard flange 3 are connected by a screw, one end is a smooth hole, the other end is a threaded hole, and the connection length is about 200mm. Due to the processing error of the thread, there will be a small inclination angle. After extending to 200mm, the deviation will increase to 2-3mm. Both ends are changed to smooth hole connection, which can well accommodate the processing error and is convenient and quick to install. Adding nuts and washers on both sides of the flange of the sealing body 5 can also play a positioning role. The internal sealing ring group and O-ring 12 often fall off during workshop assembly. The improved version adds a small inclination angle to the connection part, that is, a groove 11 is provided on the outer end face of the second sealing ring 10, and a circle of sealing ring 12 is placed in the groove 11. The groove 11 has a vertical surface and an inclined surface (inclination); the sealing ring 12 is placed in the groove 11, and the inner diameter of the sealing ring 12 is reduced at the same time, which can be reliably connected. While increasing work efficiency, it also ensures the accuracy of matching; the original flange and reducer adopt a welded structure, and the reducer and flange are butt-welded, and the coaxiality is difficult to ensure, and the phenomenon of misalignment often occurs, which is not beautiful and also easily leads to a decrease in strength. The flange and reducer are changed from a welded split structure to an integrated structure to ensure the coaxiality requirements.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A compressor liquid injection device, characterized in that: Including nozzle assembly, sealing assembly and ball valve, The nozzle assembly includes a head end flange, a valve, a non-standard flange and a liquid injection pipe; wherein the head end flange is welded to the valve and is an integral structure, including a flange connection part and a reducing part, and a coaxial through hole is arranged inside; The sealing assembly comprises a sealing body, a sealing nut and an internal sealing ring group, wherein the sealing body is integrally arranged on the outer periphery of the liquid injection tube, and the front end is sealed with the liquid injection tube through the sealing nut; flange connection holes are distributed in the middle and the tail end; the internal sealing ring group is arranged between the head end of the sealing body and the liquid injection tube; the internal sealing ring group comprises a first sealing ring, an intermediate sealing ring and a second sealing ring, and a plurality of intermediate sealing rings are arranged in a V shape and are arranged in close contact with each other; the first sealing ring has a V-shaped recess on the contact surface with the intermediate sealing ring, and the second sealing ring has a V-shaped protrusion on the contact surface with the intermediate sealing ring, and the first sealing ring and the second sealing ring fix the plurality of intermediate sealing rings; a clamping groove is arranged on the outer end surface of the second sealing ring, and a circle of sealing rings is placed in the clamping groove, and the clamping groove has a vertical surface and an inclined surface; The non-standard flange is connected to the middle flange connection hole of the sealing body through a set of long rods; The ball valve has flange connection holes at both ends, and the flange connection hole at the tail end of the sealing body is bolted to the flange connection hole of the ball valve; the head end of the injection pipe passes through the sealing body and the ball valve in turn and is inserted into the compressor for injection.

2. A compressor liquid injection device according to claim 1, characterized in that: The connection hole on the non-standard flange and the flange connection hole in the middle of the sealing body are both round through holes with smooth inner walls, and the long rod passes through the outer sides of the round through holes and is connected by bolts.

3. A compressor liquid injection device according to claim 1, characterized in that: It also includes a flange connection group, which is arranged between the ball valve and the compressor.

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