Marine diesel engine waste gas booster pump

Abstract

The utility model relates to the technical field of marine diesel engines, in particular to a marine diesel engine waste gas booster pump, which comprises a high-speed variable frequency motor, a semicircular flange, a plurality of high-strength bolts, a centrifugal compressor and an auxiliary mechanism, a pressure relief hole is arranged in the middle of the semicircular flange, the centrifugal compressor comprises an impeller and a casing, and an extending shaft is arranged in the middle of the impeller. The auxiliary mechanism comprises two sealing strips and two arc-shaped plates, a T-shaped block is arranged at one end of each arc-shaped plate, a connecting plate is arranged at the other end of each arc-shaped plate, an arc-shaped groove is formed in the lower portion of the shell, abutting faces are arranged on the two sides of the arc-shaped groove, and T-shaped grooves are formed in the two ends of the arc-shaped groove. And particles and liquid drops can fall on the two arc-shaped plates under the action of gravity, and finally, the two arc-shaped plates which are convenient to disassemble are taken down for cleaning, so that the cleaning efficiency is improved, and the cleaning process becomes simple and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of ship diesel engines, in particular to an exhaust gas booster pump for ship diesel engines. Background Art

[0002] A diesel engine is a type of internal combustion engine. The main feature of a diesel engine is its large output torque, and it is often used to drive large vehicles. Nowadays, in order to meet the needs of energy conservation and emission reduction, many internal combustion engines have developed EGR exhaust gas boosting technology, but most of them are limited to gasoline engines or other small-displacement diesel engines, such as automobiles or motorcycles. For ship diesel engines that use heavy oil, the medium flowing through the exhaust gas booster pump is the recirculated exhaust gas of the diesel engine, which contains particulate matter, sulfides, water particles, etc. At the same time, the EGR exhaust gas flow rate of ship diesel engines is large, which will cause part of the exhaust gas to enter the bearing clearance of the high-speed rotating motor. The particles and sulfides in the exhaust gas damage the motor and reduce its service life.

[0003] Prior art patent CN106762789B discloses a semicircular flange structure and a marine diesel engine exhaust booster pump, comprising a high-speed variable frequency motor and a centrifugal compressor, a bracket is arranged at the bottom of the high-speed variable frequency motor, the high-speed variable frequency motor is coaxially connected with the centrifugal compressor, a semicircular flange structure is arranged between the connection of the high-speed variable frequency motor and the centrifugal compressor, the through hole is communicated with the air flow channel of the centrifugal compressor, the exhaust gas discharged from the cylinder of the marine diesel engine enters the centrifugal compressor, and under the drive of the high-speed variable frequency motor, the exhaust gas is boosted according to the requirements of the working load point flow rate and the pressure ratio, and the boosting The exhaust gas after re-enters the ship diesel engine intake system to participate in combustion; in this process, a small amount of exhaust gas will enter the gap between the centrifugal compressor casing and the impeller component, and under the action of the carbon ring seal and the labyrinth seal, most of the particles and droplets are blocked in the centrifugal compressor casing; the remaining leaked exhaust gas moves in a circle along the motor main shaft and continues to enter the fan-shaped cavity of the semicircular flange, and is further separated and deposited to the bottom of the semicircular flange structure under the action of centrifugal force, and the particles and droplets separated in the exhaust gas are finally discharged through the pressure relief hole; the existing technology has a simple sealing structure, good sealing effect, low cost and strong reliability.

[0004] However, in the above-mentioned prior art, when cleaning particles and droplets in the centrifugal compressor, the components on the centrifugal compressor will affect the cleaning progress of the staff, making the cleaning process very troublesome. Utility Model Content

[0005] The utility model aims to provide a marine diesel engine exhaust booster pump, aiming to solve the technical problem in the prior art that when cleaning particles and droplets in the centrifugal compressor, the components on the centrifugal compressor will affect the cleaning progress of the staff, thereby making the cleaning process very troublesome.

[0006] To achieve the above-mentioned purpose, the utility model adopts a marine diesel engine exhaust booster pump, including a high-speed variable frequency motor, a semicircular flange, a plurality of high-strength bolts, a centrifugal compressor and an auxiliary mechanism, the output end of the high-speed variable frequency motor is provided with a main shaft, one end of the main shaft has end face teeth, the middle part of the semicircular flange has a pressure relief hole, the centrifugal compressor includes an impeller and a casing, the middle part of the impeller is provided with an extension shaft, one end of the extension shaft has a tooth groove, the high-speed variable frequency motor is fixedly connected to the centrifugal compressor through the semicircular flange and the plurality of high-strength bolts, and is located at the end of the centrifugal compressor away from the inlet, the extension shaft is drivingly connected to the main shaft, and is located at the One end of the main shaft, and the end face tooth is located in the tooth groove, the auxiliary mechanism includes two sealing strips and two arc plates, one end of the arc plate is provided with a T-shaped block, the other end of the arc plate is provided with a connecting plate, the bottom of the shell is provided with an arc groove, both sides of the arc groove have abutting surfaces, both ends of the arc groove have T-shaped grooves, the two sealing strips are respectively fixedly connected to the shell and are located at the abutting surfaces, the two arc plates are respectively abutted against each other with the shell and are located in the arc groove and abutted on the corresponding sealing strips, the connecting plates of the two arc plates are fixedly connected by bolts, the T-shaped block is slidably connected to the shell and is located in the T-shaped groove.

[0007] Wherein, two fixing plates are further arranged at one end of the arc-shaped plate, and the two fixing plates are located on the T-shaped block, and the two fixing plates are fixedly connected to the shell by bolts and are located on the outer side of the shell.

[0008] Wherein, carbon ring sealing rings are arranged on both sides of the semicircular flange.

[0009] Wherein, the ship diesel engine exhaust boost pump also includes a bracket, which is fixedly connected to the high-speed variable frequency motor and is located below the high-speed variable frequency motor.

[0010] Wherein, the semicircular flange includes a cover plate and an arc-shaped ring body, the pressure relief hole is located in the middle of the arc-shaped ring body, the cover plate is fixedly connected to the arc-shaped ring body by bolts, and is located above the arc-shaped ring body, the high-speed variable frequency motor is fixedly connected to the centrifugal compressor through the arc-shaped ring body and multiple high-strength bolts, and is located at the end of the centrifugal compressor away from the inlet, and the cover plate covers the main shaft.

[0011] Wherein, an arc-shaped protrusion is arranged in the middle of the cover plate.

[0012] The utility model discloses a marine diesel engine exhaust booster pump, comprising a high-speed variable frequency motor, a semicircular flange, a plurality of high-strength bolts, a centrifugal compressor and an auxiliary mechanism, wherein a main shaft is arranged at the output end of the high-speed variable frequency motor, one end of the main shaft has end face teeth, a pressure relief hole is arranged in the middle of the semicircular flange, the centrifugal compressor comprises an impeller and a housing, a protruding shaft is arranged in the middle of the impeller, one end of the protruding shaft has a tooth groove, the auxiliary mechanism comprises two sealing strips and two arc plates, one end of the arc plate is provided with a T-shaped block, the other end of the arc plate is provided with a connecting plate, an arc groove is arranged below the housing, both sides of the arc groove have abutting surfaces, and both ends of the arc groove have T-shaped grooves, by opening an arc groove below the housing and arranging the arc plate as an inner bottom component of the housing, particles and droplets fall on the two arc plates under the action of gravity, and finally the two arc plates that can be easily disassembled are removed for cleaning, thereby improving the cleaning efficiency, and making the cleaning process simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a front view of the first embodiment of the utility model.

[0015] Figure 2 The utility model Figure 1 Section view along line AA.

[0016] Figure 3 The utility model Figure 2 A partial enlarged view of point B in the middle.

[0017] Figure 4 The utility model Figure 1 Sectional view along the CC line.

[0018] Figure 5 It is a structural schematic diagram of the housing in the first embodiment of the present utility model.

[0019] Figure 6 It is a structural schematic diagram of the curved plate in the first embodiment of the utility model.

[0020] Figure 7It is a structural schematic diagram of a semicircular flange in the first embodiment of the utility model.

[0021] Figure 8 It is a three-dimensional stereogram of the second embodiment of the utility model.

[0022] Fig. 9 It is a structural schematic diagram of a semicircular flange in the second embodiment of the present utility model.

[0023] 101-high-speed variable frequency motor, 102-semicircular flange, 103-high-strength bolts, 104-main shaft, 105-end face teeth, 106-pressure relief hole, 107-impeller, 108-housing, 109-extended shaft, 110-tooth groove, 111-sealing strip, 112-arc plate, 113-T-shaped block, 114-connecting plate, 115-arc groove, 116-supporting surface, 117-T-shaped groove, 118-fixing plate, 119-carbon ring sealing ring, 201-bracket, 202-cover plate, 203-arc ring body, 204-arc protrusion. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] First embodiment:

[0026] See also Figure 1 to Figure 7 ,in Figure 1 This is a front view of the first embodiment of the utility model. Figure 2 The utility model Figure 1 The cross-sectional view along the AA line. Figure 3 The utility model Figure 2 A partial enlarged view of point B in the middle. Figure 4 The utility model Figure 1 Cross-sectional view of the CC line, Figure 5 This is a schematic diagram of the structure of the housing in the first embodiment of the present utility model. Figure 6 This is a schematic structural diagram of the curved plate in the first embodiment of the utility model. Figure 7 It is a structural schematic diagram of a semicircular flange in the first embodiment of the utility model.

[0027] The utility model provides a marine diesel engine exhaust booster pump, comprising a high-speed variable frequency motor 101, a semicircular flange 102, a plurality of high-strength bolts 103, a centrifugal compressor and an auxiliary mechanism, wherein the auxiliary mechanism comprises two sealing strips 111 and two arc-shaped plates 112. The above-mentioned scheme solves the technical problem that when cleaning particles and droplets in the centrifugal compressor, the components on the centrifugal compressor will affect the cleaning progress of the staff, thereby making the cleaning process very troublesome.

[0028] According to the present specific implementation, the output end of the high-speed variable frequency motor 101 is provided with a main shaft 104, one end of the main shaft 104 has an end face tooth 105, the middle part of the semicircular flange 102 has a pressure relief hole 106, the centrifugal compressor includes an impeller 107 and a casing 108, the middle part of the impeller 107 is provided with an extension shaft 109, one end of the extension shaft 109 has a tooth groove 110, the high-speed variable frequency motor 101 is fixedly connected to the centrifugal compressor through the semicircular flange 102 and a plurality of the high-strength bolts 103, and is located at the end of the centrifugal compressor away from the inlet, the extension shaft 109 is transmission-connected to the main shaft 104, and is located at one end of the main shaft 104, and the end face tooth 105 is located in the tooth groove 110, The exhaust gas discharged from the cylinder of the ship diesel engine enters the centrifugal compressor, and under the drive of the high-speed variable frequency motor 101, the exhaust gas begins to be pressurized according to the requirements of the working load point flow and pressure ratio, and the supercharged exhaust gas re-enters the ship diesel engine intake system to participate in combustion; during this process, a small amount of exhaust gas will enter the gap between the shell 108 and the impeller 107 components, and under the effect of the sealed environment, most of the particles and droplets therein are blocked in the shell 108; the remaining leaked exhaust gas moves in a circle along the main shaft 104 and continues to enter the semicircular flange 102, and under the effect of centrifugal force, it is further separated and deposited on the inner bottom of the semicircular flange 102 structure, and the particles and droplets separated in the exhaust gas are finally discharged through the pressure relief hole 106.

[0029] Among them, a T-shaped block 113 is provided at one end of the arc plate 112, and a connecting plate 114 is provided at the other end of the arc plate 112. An arc groove 115 is provided below the shell 108, and both sides of the arc groove 115 have abutting surfaces 116. Both ends of the arc groove 115 have T-shaped grooves 117. The two sealing strips 111 are respectively fixedly connected to the shell 108 and are located at the abutting surfaces 116. The two arc plates 112 are respectively abutted against the shell 108 and are located in the arc groove 115 and abut against the corresponding sealing strips 117. 11, the connecting plates 114 of the two arc plates 112 are fixedly connected by bolts, the T-block 113 is slidably connected to the shell 108 and is located in the T-slot 117, and by opening an arc slot 115 below the shell 108 and setting the arc plate 112 as an inner bottom component of the shell 108, particles and droplets will fall on the two arc plates 112 due to gravity, and finally the two easily detachable arc plates 112 are removed for cleaning, thereby improving the cleaning efficiency and making the cleaning process simple and convenient.

[0030] Secondly, two fixing plates 118 are further provided at one end of the arc plate 112, and the two fixing plates 118 are located on the T-shaped block 113. The two fixing plates 118 are fixedly connected to the shell 108 by bolts and are located on the outer side of the shell 108. The fixing plates 118 can be used to easily fix one end of the arc plate 112, thereby improving the sealing between the arc plate 112 and the shell 108.

[0031] Again, carbon ring seals 119 are provided on both sides of the semicircular flange 102 , and the carbon ring seals 119 can improve the sealing performance between the semicircular flange 102 , the high-speed variable frequency motor 101 and the centrifugal compressor.

[0032] When using the utility model to clean particles and droplets, a plurality of bolts are removed by using a special tool, and then the arc plate 112 is pulled so that the T-block 113 removes the T-slot 117. At this time, the two arc plates 112 can be cleaned to remove particles and droplets on their surfaces. When installation is required, the two arc plates 112 are installed in the arc slot 115, and the two arc plates 112 are spliced ​​with each other so that the two connecting plates 114 are against each other. At the same time, the T-block 113 is inserted into the T-slot 117, and the connecting plates 114 are connected by bolts. Finally, the fixing plate 118 is connected to the casing 108 by bolts. In this way, the technical problem that when cleaning particles and droplets in the centrifugal compressor, the components on the centrifugal compressor will affect the cleaning progress of the staff, making the cleaning process very troublesome is solved.

[0033] The second embodiment is:

[0034] Based on the first embodiment, please refer to Figure 8-Figure 9 ,in Figure 8 It is a three-dimensional stereogram of the second embodiment of the utility model. Fig. 9 It is a structural schematic diagram of a semicircular flange in the second embodiment of the utility model.

[0035] The utility model provides a marine diesel engine exhaust gas booster pump, which also includes a bracket 201 , and the semicircular flange 102 includes a cover plate 202 and an arc-shaped ring body 203 .

[0036] According to this specific embodiment, the bracket 201 is fixedly connected to the high-speed variable frequency motor 101 and is located below the high-speed variable frequency motor 101. The bracket 201 can be used to support the high-speed variable frequency motor 101, so that the high-speed variable frequency motor 101 can work in different environments.

[0037] Among them, the pressure relief hole 106 is located in the middle of the arc-shaped ring body 203, the cover plate 202 is fixedly connected to the arc-shaped ring body 203 by bolts, and is located above the arc-shaped ring body 203, the high-speed variable frequency motor 101 is fixedly connected to the centrifugal compressor through the arc-shaped ring body 203 and multiple high-strength bolts 103, and is located at the end of the centrifugal compressor away from the inlet, and the cover plate 202 covers the main shaft 104. Through the design of the cover plate 202 and the arc-shaped ring body 203, a sealed environment can be formed under the cooperation of the high-speed variable frequency motor 101 and the centrifugal compressor.

[0038] Secondly, an arc-shaped protrusion 204 is disposed in the middle of the cover plate 202 .

[0039] A ship diesel engine exhaust booster pump using the present embodiment can conveniently support the high-speed variable frequency motor 101 through the bracket 201, so that the high-speed variable frequency motor 101 can work in different environments. The design of the cover plate 202 and the arc-shaped ring body 203 can form a sealed environment under the cooperation of the high-speed variable frequency motor 101 and the centrifugal compressor.

[0040] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the utility model.

Claims

1. A marine diesel engine exhaust booster pump, comprising a high-speed variable frequency motor, a semicircular flange, a plurality of high-strength bolts and a centrifugal compressor, wherein a main shaft is provided at the output end of the high-speed variable frequency motor, one end of the main shaft has face teeth, the middle part of the semicircular flange has a pressure relief hole, the centrifugal compressor comprises an impeller and a casing, the middle part of the impeller is provided with an extension shaft, one end of the extension shaft has a tooth groove, the high-speed variable frequency motor is fixedly connected to the centrifugal compressor through the semicircular flange and the plurality of high-strength bolts, and is located at the end of the centrifugal compressor away from the inlet, the extension shaft is drivingly connected to the main shaft, and is located at one end of the main shaft, and the face teeth are located in the tooth groove, characterized in that It also includes auxiliary institutions; The auxiliary mechanism includes two sealing strips and two arc-shaped plates, one end of the arc-shaped plate is provided with a T-shaped block, the other end of the arc-shaped plate is provided with a connecting plate, the bottom of the shell is provided with an arc-shaped groove, both sides of the arc-shaped groove have abutting surfaces, both ends of the arc-shaped groove have T-shaped grooves, the two sealing strips are respectively fixedly connected to the shell and are located at the abutting surfaces, the two arc-shaped plates are respectively abutted against each other with the shell and are located in the arc-shaped groove and abut against the corresponding sealing strips, the connecting plates of the two arc-shaped plates are fixedly connected by bolts, the T-shaped block is slidably connected to the shell and is located in the T-shaped groove.

2. The marine diesel engine exhaust booster pump according to claim 1, characterized in that: Two fixing plates are also arranged at one end of the arc-shaped plate, and the two fixing plates are located on the T-shaped block. The two fixing plates are fixedly connected to the shell by bolts and are located on the outer side of the shell.

3. The marine diesel engine exhaust booster pump according to claim 2, characterized in that: Carbon ring sealing rings are arranged on both sides of the semicircular flange.

4. The marine diesel engine exhaust booster pump according to claim 3, characterized in that: The ship diesel engine exhaust boost pump also includes a bracket, which is fixedly connected to the high-speed variable frequency motor and is located below the high-speed variable frequency motor.

5. The marine diesel engine exhaust booster pump according to claim 4, characterized in that: The semicircular flange includes a cover plate and an arc-shaped ring body, the pressure relief hole is located in the middle of the arc-shaped ring body, the cover plate is fixedly connected to the arc-shaped ring body by bolts, and is located above the arc-shaped ring body, the high-speed variable frequency motor is fixedly connected to the centrifugal compressor through the arc-shaped ring body and multiple high-strength bolts, and is located at the end of the centrifugal compressor away from the inlet, and the cover plate covers the main shaft.

6. The marine diesel engine exhaust booster pump according to claim 5, characterized in that: An arc-shaped protrusion is arranged in the middle of the cover plate.

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