A single-stage high-pressure liquid ring compressor and a manufacturing method thereof

Abstract

The present invention discloses a single-stage high-pressure liquid ring compressor and a manufacturing method thereof, comprising a pump body, wherein a front suction and exhaust disk and a front pump cover are fixedly installed on one end surface of the pump body by tie rod bolts, and a rear suction and exhaust disk and a rear pump cover are fixedly installed on the other end surface of the pump body by tie rod bolts, the surfaces of the front pump cover and the rear pump cover are fixedly connected with a bearing frame, a shaft is rotatably installed on the side of the bearing frame, an impeller is connected with an interference fit at the center of the surface of the shaft, the surface of the impeller is rotatably connected to the side of the pump body, and a container mechanical seal is fixedly installed on the two end surfaces of the shaft, one end of the container mechanical seal is connected to a covering sleeve, one side surface of the covering sleeve is sleeved on the two ends of the shaft, one end of the covering sleeve is provided with an O-ring, and the surface of the O-ring is connected to the stop side of the impeller, which is beneficial to production, processing and assembly and installation, and convenient for popularization and use.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and more particularly to a single-stage high-pressure liquid ring compressor and a manufacturing method thereof. Background Art

[0002] In today's industrial production, a variety of structures are used Compressors, among which the single-stage liquid ring compressor is a commonly used one. The single-stage liquid ring compressor refers to a working structure and method that uses a single-stage rotor and pump chamber compression.

[0003] However, in the existing compressor structure, due to the requirements of structure and performance, the processing methods and layout structures adopted are also different. The two-stage liquid ring compressor is realized. The two-stage liquid ring compressor adopts a two-stage rotor and a pump chamber in series structure. The processing accuracy is high and the assembly adjustment is difficult. At the same time, there are many fault points and the equipment operation stability is poor. In addition, when processing parts, the overall casting method is used to make blanks, which has a series of defects such as high casting difficulty, many casting defects that are not easy to find, uneven blade size, and large surface roughness resulting in large fluid resistance. These defects will greatly reduce the operating stability, life, and air extraction compression efficiency of the liquid ring compressor. The split welding method requires multiple parts to be assembled and welded, with many welds, easy deformation after welding, and the impeller blade profile angle is not easy to guarantee. At the same time, when used in corrosive conditions, the weld is the most prone to intergranular corrosion and has a short service life. Therefore, a new structure and manufacturing method need to be proposed. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a single-stage high-pressure liquid ring compressor and a manufacturing method thereof. By adopting round steel of different materials selected according to different application conditions, an integral blank is made by forging. After turning, the hollow part of the blade is processed and initially formed by wire cutting. Finally, the entire impeller blade profile is processed and formed by a vertical machining center, ensuring that the impeller profile is fully in compliance. At the same time, the strength and rigidity of the impeller of the overall structure are fully guaranteed. The blank material of the round steel forging part is zero-defective, and the process defects of the cast impeller and the welded impeller are eliminated to ensure the stability of processing and manufacturing. At the same time, a one-stage rotor and pump cavity compression are adopted, the impeller linear speed is ≥38m / s, and the maximum exhaust pressure can reach up to 0.6Mpa (G), which completely replaces the application of the two-stage liquid ring compressor. The structural design of the single-stage impeller is more compact, and the processing, assembly and maintenance are simple. It is more suitable for the compression and transportation of flammable and explosive gases, which is conducive to production and processing and assembly and installation, and is convenient for promotion and use.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A single-stage high-pressure liquid ring compressor and a manufacturing method thereof, comprising a pump body, one end surface of the pump body is fixedly mounted with a front suction and exhaust plate and a front pump cover by tie rod bolts, the other end surface of the pump body is fixedly mounted with a rear suction and exhaust plate and a rear pump cover by tie rod bolts, the surfaces of the front pump cover and the rear pump cover are fixedly connected with a bearing frame, a shaft is rotatably mounted on the side of the bearing frame, an impeller is connected with an interference fit at the center of the surface of the shaft, the surface of the impeller is rotatably connected to the side of the pump body, both end surfaces of the shaft are fixedly mounted with a container-type mechanical seal, one end of the container-type mechanical seal is connected with a covering sleeve, one side surface of the covering sleeve is sleeved on both ends of the shaft, one end of the covering sleeve is provided with an O-ring, the surface of the O-ring is connected to the stop side of the impeller;

[0007] An end face sealing ring is arranged on one end surface of the container-type mechanical seal, and one side surface of the end face sealing ring is tightly connected to the stop position of the front pump cover. The front pump cover is connected by the end face sealing ring, and the medium can be isolated in one step, thereby improving the safety of use. The surfaces of the front suction and exhaust disc and the rear suction and exhaust disc are provided with flexible adjustment exhaust grooves, positioning pin holes, exhaust port profiles, exhaust holes, water inlet holes, shaft holes, water inlet grooves and suction port profiles. The structure of the front suction and exhaust disc and the rear suction and exhaust disc is arranged, which is conducive to processing and production, and ensures the efficiency and stability of compression;

[0008] The manufacturing method of the compressor comprises the following steps:

[0009] S1. Select round steel of different materials as extrusion raw materials according to different application conditions;

[0010] S2, making an integral blank by forging;

[0011] S3. After turning, the hollow part of the blade is processed by wire cutting for preliminary shaping;

[0012] S4. The entire impeller blade profile is processed and formed by a vertical machining center;

[0013] S5, the suction and exhaust disc is cut from steel plate to form a blank disc;

[0014] S6, adopts vertical machining center to form the air intake port line, exhaust port line and flexible adjustable exhaust slot line;

[0015] S7, finally assemble and install.

[0016] Furthermore, a cylindrical roller bearing is fixedly mounted on one end surface of the bearing frame, and the side surface of the cylindrical roller bearing is rotatably connected to one end surface of the shaft. By connecting the shaft through the cylindrical roller bearing, one end can be stably supported to ensure stability.

[0017] Furthermore, a front bearing cover is fixedly installed on one end surface of the bearing frame, and one side surface of the front bearing cover is tightly connected to the side surface of the cylindrical roller bearing. The cylindrical roller bearing is connected via the front bearing cover, which is convenient for installation and disassembly and for positioning and use.

[0018] Furthermore, the other end surface of the bearing frame is fixedly connected to a positioning bearing shell, and a double-row angular contact bearing is fixedly installed on the side of the positioning bearing shell. The side of the double-row angular contact bearing is rotatably connected to the other end surface of the shaft. By connecting the double-row angular contact bearing to the positioning bearing shell, the shaft can be supported and positioned to ensure smooth movement and avoid movement.

[0019] Furthermore, a rear bearing cover is fixedly installed on the other end surface of the positioning bearing shell by a locking screw, and one end surface of the rear bearing cover is tightly connected to one side surface of the double-row angular contact bearing. By connecting the rear bearing cover by the locking screw, the double-row angular contact bearing can be positioned and supported to ensure safety and stability.

[0020] Furthermore, both ends of the side surface of the covering sleeve are fixedly connected with inner hole sealing rings, and the sides of the inner hole sealing rings are sleeved on the two end surfaces of the shaft. The inner hole sealing rings cooperate with the shaft to form a sealing structure, which can isolate the medium and improve the safety and stability of the shaft.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] (1) This solution ensures full compliance with the impeller profile. At the same time, the strength and rigidity of the integral structure impeller are fully guaranteed. The round steel forging blank material is zero-defect, eliminating the process defects of cast and welded impellers to ensure the stability of processing and manufacturing. At the same time, a single-stage rotor and pump cavity compression are adopted, the impeller linear speed is ≥38m / s, and the maximum exhaust pressure can reach 0.6Mpa(G), which completely replaces the application of the two-stage liquid ring compressor. The single-stage impeller has a more compact structural design and is easy to process, assemble and maintain.

[0023] (2) Connecting the shaft through a cylindrical roller bearing can provide stable support at one end to ensure stability.

[0024] (3) The cylindrical roller bearing is connected through the front bearing cover, which is convenient for installation and disassembly and positioning.

[0025] (4) By connecting the double-row angular contact bearings through the positioning bearing shell, the shaft can be supported and positioned to ensure smooth movement and avoid movement.

[0026] (5) The rear bearing cover is connected by locking screws to position and support the double-row angular contact bearing to ensure safety and stability.

[0027] (6) The inner hole sealing ring cooperates with the shaft to form a sealing structure, which can isolate the medium and improve the safety and stability of the shaft.

[0028] (7) By connecting the front pump cover through the end face sealing ring, the medium can be isolated in one step, improving the safety of use.

[0029] (8) The structure of the front suction and exhaust disk and the rear suction and exhaust disk is provided to facilitate processing and production and ensure the efficiency and stability of compression. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 is a surface schematic diagram of an impeller of the present invention;

[0032] Figure 3 This is a partial enlarged view of the connection of the coated sleeve of the present invention;

[0033] Figure 4 It is a schematic structural diagram of the front suction and exhaust disk and the rear suction and exhaust disk of the present invention.

[0034] Description of the numbers in the figure:

[0035] 1 shaft, 2 front bearing gland, 3 cylindrical roller bearing, 4 bearing frame, 5 assembled mechanical seal, 6 covered sleeve, 7 tie rod bolt, 8 front pump cover, 9 front suction and exhaust disc, 10 O-ring, 11 impeller, 12 pump body, 13 rear suction and exhaust disc, 14 rear pump cover, 15 positioning bearing shell, 16 double-row angular contact bearing, 17 locking screw, 18 bearing gland, 19 inner hole sealing ring, 20 end face sealing ring, 31 flexible adjustment exhaust groove, 32 positioning pin hole, 33 exhaust port profile, 34 exhaust hole, 35 water inlet hole, 36 shaft hole, 37 water inlet groove, 38 suction port profile. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0037] See also Figure 1-4 , a single-stage high-pressure liquid ring compressor and a manufacturing method thereof, comprising a pump body 12, see Figure 1 and Figure 2One end surface of the pump body 12 is fixedly installed with a front suction and exhaust plate 9 and a front pump cover 8 through a tie rod bolt 7, and the other end surface of the pump body 12 is fixedly installed with a rear suction and exhaust plate 13 and a rear pump cover 14 through a tie rod bolt 7. The surfaces of the front pump cover 8 and the rear pump cover 14 are fixedly connected with a bearing frame 4, and a shaft 1 is rotatably installed on the side of the bearing frame 4. An impeller 11 is connected with an interference fit at the center of the surface of the shaft 1. The surface of the impeller 11 is rotatably connected to the side of the pump body 12, and a container mechanical seal 5 is fixedly installed on the two end surfaces of the shaft 1. One end of the container mechanical seal 5 is connected with a covering sleeve 6, and one side surface of the covering sleeve 6 is sleeved on the two ends of the shaft 1. An O-ring 10 is provided at one end of the covering sleeve 6, and the surface of the O-ring 10 is connected to the stop side of the impeller 11.

[0038] See also Figure 2 and Figure 3 A cylindrical roller bearing 3 is fixedly installed on one end surface of the bearing frame 4. The side of the cylindrical roller bearing 3 is rotatably connected to the surface of one end of the shaft 1. The shaft is connected by the cylindrical roller bearing, which can stably support one end to ensure stability. A front bearing cover 2 is fixedly installed on one end surface of the bearing frame 4. One side surface of the front bearing cover 2 is tightly connected to the side of the cylindrical roller bearing 3. The cylindrical roller bearing is connected by the front bearing cover, which is convenient for installation and disassembly and convenient for positioning and use. A positioning bearing shell 15 is fixedly connected to the other end surface of the bearing frame 4. The side of the positioning bearing shell 15 A double-row angular contact bearing 16 is fixedly installed, and the side of the double-row angular contact bearing 16 is rotatably connected to the other end surface of the shaft 1. The double-row angular contact bearing is connected by a positioning bearing shell, so that the shaft can be supported and positioned to ensure the smoothness of movement and avoid movement. The other end surface of the positioning bearing shell 15 is fixedly installed with a rear bearing cover 18 by a locking screw 17. One end surface of the rear bearing cover 18 is tightly connected to one side surface of the double-row angular contact bearing 16. The rear bearing cover is connected by a locking screw, so that the double-row angular contact bearing can be positioned and supported to ensure safety and stability.

[0039] See also Figure 2 and Figure 4, both ends of the side surface of the covering shaft sleeve 6 are fixedly connected with an inner hole sealing ring 19, and the side surface of the inner hole sealing ring 19 is sleeved on the two end surfaces of the shaft 1. The inner hole sealing ring cooperates with the shaft to form a sealing structure, which can isolate the medium and improve the safety and stability of the shaft. An end surface of the container mechanical seal 5 is provided with an end face sealing ring 20, and one side surface of the end face sealing ring 20 is tightly connected to the stop position of the front pump cover 8. The front pump cover is connected by the end face sealing ring, which can isolate the medium in only one step and improve the safety of use. The surfaces of the front suction and exhaust disc 9 and the rear suction and exhaust disc 13 are provided with flexible adjustable exhaust grooves 31, positioning pin holes 32, exhaust port profiles 33, exhaust holes 34, water inlet holes 35, shaft holes 36, water inlet grooves 37 and suction port profiles 38. The structure of the front suction and exhaust disc and the rear suction and exhaust disc is set, which is conducive to processing and production, and ensures the efficiency and stability of compression.

[0040] The manufacturing method comprises the following steps:

[0041] S1. Select round steel of different materials as extrusion raw materials according to different application conditions;

[0042] S2, making an integral blank by forging;

[0043] S3. After turning, the hollow part of the blade is processed by wire cutting for preliminary shaping;

[0044] S4. The entire impeller blade profile is processed and formed by a vertical machining center;

[0045] S5, the suction and exhaust disc is cut from steel plate to form a blank disc;

[0046] S6, adopts vertical machining center to form the air intake port line, exhaust port line and flexible adjustable exhaust slot line;

[0047] S7, finally assemble and install.

[0048] Example

[0049] The use of integral casting to make blanks has a series of defects such as high casting difficulty, many casting defects that are not easy to find, uneven blade size, large surface roughness resulting in large fluid resistance, etc. These defects will lead to a significant reduction in the operating stability, life, and air extraction compression efficiency of the liquid ring compressor. The use of split welding requires the assembly and welding of multiple components, with many welds and easy deformation after welding. The angle of the impeller blade profile is not easy to guarantee. At the same time, when used in corrosive conditions, the weld is the most likely site for intergranular corrosion and has a short service life. In view of the shortcomings of the above production methods, we use round steel of different materials selected according to different application conditions to make the overall blank by forging. After turning, the hollow part of the blade is processed by wire cutting for preliminary shaping. Finally, the entire impeller blade profile is processed and formed by the vertical machining center, ensuring that the impeller profile is fully in line with the requirements. At the same time, the strength and rigidity of the integral structure impeller are fully guaranteed. The blank material of the round steel forging part is zero-defective, eliminating the process defects of the casting impeller and the welding impeller.

[0050] Fully enclosed sleeve sealing structure: The shaft 1 of the liquid ring compressor is a rotating component that transmits torque. In order to prevent the corrosive medium from corroding the shaft and causing it to break during the operation of the single-stage high-pressure liquid ring compressor, a fully sealed sleeve enclosed structure is designed. The containerized mechanical seal 5 and the enclosed sleeve 6 form a containerized mechanical seal assembly. An O-ring 10 is installed on the outer circle of the enclosed sleeve 6 and inserted into the inner stop of the impeller 11 to form the first seal, and the inner hole sealing ring 19 cooperates with the shaft 1 to form the second seal. The containerized mechanical seal 5 is provided with an end face sealing ring 20 to cooperate with the stop end face of the front pump cover 8 to form the third seal, thereby realizing fully enclosed sealing of the shaft in the pump chamber. The material of the O-ring and the sleeve can be selected according to the working medium to ensure that the shaft is completely free of contact with the corrosive working medium, thereby ensuring the safe and reliable use of the shaft.

[0051] Optimization design of suction and exhaust disc profile structure and improvement of processing technology: The optimization design and manufacturing accuracy of the suction and exhaust port profile structure of the liquid ring compressor determine the suction efficiency and exhaust pressure. The suction and exhaust disc of the single-stage high-pressure liquid ring compressor is cut from steel plates, and the suction port profile 38, exhaust port profile 33 and flexible adjustable exhaust groove 31 are precision-machined by a vertical machining center, ensuring zero error between the suction and exhaust port profile structure and the design drawings, thereby ensuring the suction and compression performance efficiency of the single-stage high-pressure liquid ring compressor.

[0052] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A single-stage high-pressure liquid ring compressor, comprising a pump body (12), characterized in that: The pump body (12) has a front suction and exhaust plate (9) and a front pump cover (8) fixedly mounted on one end surface thereof by means of tie rod bolts (7), and a rear suction and exhaust plate (13) and a rear pump cover (14) fixedly mounted on the other end surface thereof by means of tie rod bolts (7). The surfaces of the front pump cover (8) and the rear pump cover (14) are fixedly connected to a bearing frame (4), and a shaft (1) is rotatably mounted on the side of the bearing frame (4), and the center of the surface of the shaft (1) is connected to a An impeller (11), the surface of the impeller (11) being rotatably connected to the side surface of the pump body (12), a container-type mechanical seal (5) being fixedly mounted on the surfaces of both ends of the shaft (1), one end of the container-type mechanical seal (5) being connected to a covering sleeve (6), one side surface of the covering sleeve (6) being sleeved on the two ends of the shaft (1), one end of the covering sleeve (6) being provided with an O-ring (10), the surface of the O-ring (10) being connected to the side surface of the stopper of the impeller (11); An end face sealing ring (20) is provided on one end surface of the container-type mechanical seal (5), and one side surface of the end face sealing ring (20) is tightly connected to the stop position of the front pump cover (8), and the surfaces of the front suction and exhaust disk (9) and the rear suction and exhaust disk (13) are provided with flexible adjustment exhaust grooves (31), positioning pin holes (32), exhaust port profiles (33), exhaust holes (34), water inlet holes (35), shaft holes (36), water inlet grooves (37) and suction port profiles (38); The compressor manufacturing method comprises the following steps: S1. Select round steel of different materials as extrusion raw materials according to different application conditions; S2, making an integral blank by forging; S3. After turning, the hollow part of the blade is processed by wire cutting for preliminary shaping; S4. The entire impeller blade profile is processed and formed by a vertical machining center; S5, the suction and exhaust disc is cut from steel plate to form a blank disc; S6, adopts vertical machining center to form the air intake port line, exhaust port line and flexible adjustable exhaust slot line; S7, finally assemble and install.

2. A single-stage high-pressure liquid ring compressor according to claim 1, characterized in that: A cylindrical roller bearing (3) is fixedly mounted on one end surface of the bearing frame (4), and a side surface of the cylindrical roller bearing (3) is rotatably connected to one end surface of the shaft (1).

3. A single-stage high-pressure liquid ring compressor according to claim 1, characterized in that: A front bearing cover (2) is fixedly mounted on one end surface of the bearing frame (4), and a side surface of the front bearing cover (2) is tightly connected to the side surface of the cylindrical roller bearing (3).

4. A single-stage high-pressure liquid ring compressor according to claim 1, characterized in that: The other end surface of the bearing frame (4) is fixedly connected to a positioning bearing shell (15), and a double-row angular contact bearing (16) is fixedly installed on the side of the positioning bearing shell (15), and the side of the double-row angular contact bearing (16) is rotatably connected to the other end surface of the shaft (1).

5. A single-stage high-pressure liquid ring compressor according to claim 4, characterized in that: The other end surface of the positioning bearing shell (15) is fixedly mounted with a rear bearing cover (18) via a locking screw (17), and one end surface of the rear bearing cover (18) is tightly connected to one side surface of the double-row angular contact bearing (16).

6. A single-stage high-pressure liquid ring compressor according to claim 4, characterized in that: Both ends of the side surface of the covering shaft sleeve (6) are fixedly connected with an inner hole sealing ring (19), and the side surfaces of the inner hole sealing ring (19) are sleeved on the two end surfaces of the shaft (1).

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