A porous inner shell liquid ring pump

Abstract

This invention belongs to the field of vacuum pump technology, specifically relating to a porous inner-shell liquid ring pump, including a base, on which a shell is mounted. A main shaft is movably connected to the middle of the shell, and an impeller is provided at the end of the main shaft, located inside the shell. An end cover is detachably connected to one side of the shell, and a flow divider is provided at the connection between the shell and the end cover. An inner shell assembly is movably mounted on the inner circumference of the shell, and a pressure relief hole is provided on the inner shell assembly. When the impeller rotates to form a liquid ring, the pressure relief hole maintains the pressure balance between the inner and outer walls of the inner shell assembly. The frictional force generated by the liquid ring rotating with the inner wall of the inner shell assembly drives the inner shell assembly to rotate relative to the inner circumference of the outer shell. This invention addresses the problems of high resistance and low efficiency in traditional liquid ring pumps by proposing a liquid ring pump with a double-shell structure. The outer shell of this novel pump is fixed, while the porous inner shell can rotate with the liquid ring, resulting in advantages such as low operating resistance and high efficiency.

Description

Technical Field

[0001] This invention belongs to the field of vacuum pump technology, specifically relating to a porous internal shell liquid ring pump. Background Technology

[0002] A water ring vacuum pump, also known as a liquid ring vacuum pump, is an important negative pressure suction device. The main structural components of a water ring vacuum pump include: main shaft, impeller, pump casing, and distribution plate. A key characteristic of a water ring vacuum pump is that the impeller is eccentrically mounted inside the pump casing. Its working principle is as follows: when the impeller rotates, water or other liquid media are subjected to centrifugal force to form a water ring (liquid ring) within the pump casing. The water ring flows continuously along the central axis of the pump casing (stator) and, together with the rotor impeller blades, forms a periodically changing intake and exhaust chamber, thus achieving the intake and exhaust functions. However, this also results in low efficiency for the water ring pump. Significant friction between the water ring and the casing leads to high impeller rotation resistance, resulting in low efficiency. Currently, the energy conversion efficiency of water ring pumps in industrial applications is mainly between 15% and 50%, with an average conversion efficiency of about 30%. In the mining sector alone, the annual power consumption of medium and large-sized liquid ring pumps operating nationwide exceeds several billion kilowatt-hours. Improving the efficiency of liquid ring pumps can significantly save energy. Therefore, improving the efficiency of liquid ring pumps has become an urgent problem to be solved. To this end, the present invention proposes a porous inner shell liquid ring pump. Summary of the Invention

[0003] The purpose of this invention is to provide a porous inner shell liquid ring pump that can improve the energy conversion efficiency of the liquid ring pump, thereby saving resources.

[0004] The specific technical solution adopted by this invention is as follows:

[0005] A porous inner shell liquid ring pump includes a base, on which a housing is mounted. A main shaft is movably connected to the middle of the housing, and an impeller is provided at the end of the main shaft. The impeller is located inside the housing. An end cover is detachably connected to one side of the housing. A flow divider is provided at the connection between the housing and the end cover. An inner shell assembly is movably provided on the inner circumferential wall of the housing. A pressure relief hole is provided on the inner shell assembly. When the impeller rotates to form a liquid ring, the pressure relief hole maintains the pressure balance between the inner wall and the outer wall of the inner shell assembly. The frictional force generated between the liquid ring and the inner wall of the inner shell assembly when they rotate drives the inner shell assembly to rotate relative to the inner circumferential wall of the housing.

[0006] Preferably, the inner shell assembly includes an inner shell left side plate and an inner shell right side plate. A left friction ring is installed on the boss inside the outer shell by an interference fit. The inner shell left side plate is installed on the left friction ring. The inner shell right side plate is fixedly connected to the inner shell left side plate by a mortise and tenon structure or by screws. A right friction ring is installed on the distributor plate by an interference fit. The right friction ring is compatible with the inner shell right side plate.

[0007] Preferably, when the impeller rotates to form a liquid ring, both the left friction ring and the right friction ring are located inside the liquid ring.

[0008] Preferably, the end cap is fixedly connected to the outer shell by bolts; the contact surface between the end cap and the outer shell is sealed with a sealing ring, and the contact surface between the diverter plate and the outer shell is sealed with a sealing ring.

[0009] Preferably, the pressure relief holes are evenly distributed in an array, and the pressure relief holes are round holes, strip holes, or square holes.

[0010] Preferably, the main shaft passes sequentially through the left side shaft hole of the housing, the mechanical seal, and the bearing, and is then connected to the motor shaft via a coupling.

[0011] Preferably, the left arm of the left side plate of the inner shell is larger than the right arm of the left side plate of the inner shell, the left arm of the left side plate of the inner shell is adapted to the left friction ring, and the dimensions of the right side plate of the inner shell and the right arm of the left side plate of the inner shell after installation are the same as the dimensions of the left arm of the left side plate of the inner shell.

[0012] Preferably, the contact surface between the left side plate of the inner shell and the left friction ring is treated with a smooth and wear-resistant finish to reduce the coefficient of friction and improve wear resistance; similarly, the contact surface between the right side plate of the inner shell and the right friction ring is treated with a smooth and wear-resistant finish to reduce the coefficient of friction and improve wear resistance; the outer wall surface of the left side plate of the inner shell is treated with a smooth finish to reduce friction; and the outer wall surface of the cylindrical permanent magnet is treated with a smooth and wear-resistant finish to reduce friction.

[0013] Preferably, the left and right friction rings adopt an L-shaped structure. The L-shaped surface of the left friction ring, where it contacts the left side plate of the inner shell, is treated with a smooth, wear-resistant finish to reduce the coefficient of friction and improve wear resistance. The right friction ring is symmetrical to the left friction ring. The L-shaped surface of the right friction ring, where it contacts the right side plate of the inner shell, is treated with a smooth, wear-resistant finish to reduce the coefficient of friction and improve wear resistance. The right and left friction rings provide support and positioning for the inner shell assembly.

[0014] The technical effects achieved by this invention are as follows:

[0015] This invention addresses the problems of high resistance and low efficiency in traditional liquid ring pumps by proposing a liquid ring pump with a double-shell structure. The outer shell of this novel pump is fixed, while the inner shell with a porous structure can rotate with the liquid ring, resulting in advantages such as low operating resistance and high efficiency. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a porous inner shell liquid ring pump according to the present invention;

[0017] Figure 2This is a schematic diagram of the overall structure of the inner shell assembly in a porous inner shell liquid ring pump according to the present invention.

[0018] Figure 3 This is a magnified view of the positional relationship between the left friction ring and the inner shell of the present invention;

[0019] Figure 4 This is a schematic diagram of the overall structure of the inner shell assembly in a porous inner shell liquid ring pump according to the present invention, from another perspective.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Outer shell; 2. Left friction ring; 3. Inner shell assembly; 4. Right friction ring; 5. End cover; 6. Diverter plate; 7. Base; 8. Impeller; 9. Mechanical seal; 10. Bearing; 11. Main shaft; 301. Left side plate of inner shell; 302. Right side plate of inner shell; 303. Pressure relief hole. Detailed Implementation

[0022] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0023] like Figures 1-4 As shown, a porous inner shell liquid ring pump includes a base 7, on which a shell 1 is mounted. A main shaft 11 is movably connected to the middle of the shell 1, and an impeller 8 is provided at the end of the main shaft 11. The impeller 8 is located inside the shell 1. An end cover 5 is detachably connected to one side of the shell 1. A flow divider 6 is provided at the connection between the shell 1 and the end cover 5. An inner shell assembly 3 is movably provided on the inner circumference of the shell 1. A pressure relief hole 303 is provided on the inner shell assembly 3. When the impeller 8 rotates to form a liquid ring, the pressure relief hole 303 maintains the pressure balance between the inner wall and the outer wall of the inner shell assembly 3. When the liquid ring rotates, the friction generated between it and the inner wall of the inner shell assembly 3 drives the inner shell assembly 3 relative to the outer shell. 1. The inner wall of the inner shell rotates; the inner shell assembly 3 includes an inner shell left side plate 301 and an inner shell right side plate 302. A left friction ring 2 is installed on the boss inside the outer shell 1 by interference fit. The inner shell left side plate 301 is installed on the left friction ring 2. The inner shell right side plate 302 is fixedly connected to the inner shell left side plate 301 by mortise and tenon structure or screw form. A right friction ring 4 is installed on the diverter plate 6 by interference fit. The right friction ring 4 and the inner shell right side plate 302 are mutually adapted. There is a gap between the outer wall surface of the inner shell assembly 3 and the inner wall surface of the outer shell 1. The impeller 8 is eccentrically set inside the inner shell assembly 3.

[0024] In this invention, the inner shell assembly 3 is rotatably mounted on the friction ring, and the inner shell assembly 3 has multiple pressure relief holes 303. The pressure relief holes 303 serve to relieve pressure, that is, to reduce the pressure difference between the inner and outer sides of the inner shell assembly 3, thereby reducing the frictional force on the friction ring when the inner shell assembly 3 rotates. When the impeller 8 drives the liquid ring to rotate, the liquid ring drives the inner shell assembly 3 to rotate. Compared with the prior art, the liquid ring rotates directly on the inner wall of the outer shell 1, which reduces the frictional force between the liquid ring and the inner wall of the outer shell 1, thereby improving the working efficiency of the drive motor and saving resources.

[0025] In the experiment, the inner shell assembly 3, the left friction ring 2 and the right friction ring 4 were not used in the comparative example. The torque, speed and power consumption were compared and the data in Table 1 and Table 2 are as follows. Table 1 is the torque, speed and power consumption data of the spindle 11 in this embodiment, and Table 2 is the torque, speed and power consumption data of the spindle 11 in this comparative example.

[0026]

[0027] Table 1: Torque, speed, and power consumption data of the spindle in this embodiment;

[0028]

[0029] Table 2: Torque, speed, and power consumption data of the spindle in the comparative example;

[0030] From the data in Tables 1 and 2, we can see that the average rotational speed of the main shaft 11 in the prior art, which serves as a comparative example, is 2745.8571 r / min; however, the average rotational speed of the main shaft 11 in this embodiment is 2873.4285 r / min. During the use of the liquid ring pump, the higher the rotational speed, the faster the pumping rate. Therefore, the pumping rate in this embodiment is fast. However, a fast pumping rate alone does not necessarily indicate high energy conversion efficiency. Combining the torque and power consumption data, we can see that the average torque of the main shaft 11 in this embodiment is 2.78 Nm, which is lower than the torque of 3.9928 Nm of the main shaft 11 in the comparative example. This indicates that the friction between the liquefied liquid and the original inner wall of the outer shell 1 is greatly reduced in this embodiment. At the same time, the power consumption of this embodiment is also lower than that of the comparative example. In summary, less electrical energy is used to pump a larger volume of liquid, ultimately improving the efficiency of the liquid ring pump and significantly saving electrical energy.

[0031] Preferably, when the impeller 8 rotates to form a liquid ring, both the left friction ring 2 and the right friction ring 4 are located inside the liquid ring.

[0032] In practical use, as the left side plate 301 and the right side plate 302 of the inner shell rotate relative to the left friction ring 2 and the right friction ring 4, respectively, heat will be generated at the corresponding contact surfaces due to friction. Since the left friction ring 2 and the right friction ring 4 are both located inside the liquid ring, the liquid during the pumping process can cool the left friction ring 2 and the right friction ring 4. At the same time, a liquid film will be generated at the contact surface between the left side plate 301 and the left friction ring 2, and a liquid film will be generated at the contact surface between the right side plate 302 and the right friction ring 4, further reducing the frictional heat generation at the corresponding contact surfaces. Under the law of conservation of energy, the overall electrical energy conversion efficiency of the liquid ring pump is further improved.

[0033] Preferably, the end cap 5 is fixedly connected to the outer shell 1 by bolts; the contact surface between the end cap 5 and the outer shell 1 is sealed with a sealing ring, and the contact surface between the diverter plate 6 and the outer shell 1 is sealed with a sealing ring.

[0034] In this invention, a sealing structure is set to ensure the internal sealing of the liquid ring pump, thereby ensuring the performance of the liquid ring pump.

[0035] Preferably, the pressure relief holes 303 are evenly distributed in an array, and the pressure relief holes 303 are round holes, strip holes, or square holes.

[0036] In this invention, when the pressure relief hole 303 is not provided, the pressure difference between the inside and outside of the inner shell assembly 3 causes friction between the outer wall of the inner shell assembly 3 and the friction ring. By providing the pressure relief hole 303, the pressure is relieved, that is, the pressure difference between the inner and outer sides of the inner shell assembly 3 is reduced, thereby reducing the friction on the friction ring when the inner shell assembly 3 rotates, thus reducing the energy consumed by friction heat generation, further improving the working efficiency of the liquid ring pump, and achieving energy saving.

[0037] Preferably, the main shaft 11 passes through the left side shaft hole of the housing 1, the mechanical seal 9, and the bearing 10 in sequence, and is then connected to the motor shaft via a coupling.

[0038] Preferably, the left arm of the inner shell left side plate 301 is larger than the right arm of the inner shell left side plate 301, the left arm of the inner shell left side plate 301 is adapted to the left friction ring 2, and the dimensions of the inner shell right side plate 302 and the right arm of the inner shell left side plate 301 after installation are the same as the dimensions of the left arm of the inner shell left side plate 301.

[0039] Preferably, the contact surface between the left side plate 301 of the inner shell and the left friction ring 2 is treated with a smooth and wear-resistant finish, for example, by spraying a wear-resistant material onto the surface, in order to reduce the coefficient of friction and improve wear resistance; similarly, the contact surface between the right side plate 302 of the inner shell and the right friction ring 4 is treated with a smooth and wear-resistant finish, for example, by spraying a wear-resistant material onto the surface, in order to reduce the coefficient of friction and improve wear resistance; the outer wall surface of the left side plate 301 of the inner shell is treated with a smooth finish to reduce friction; the outer wall surface of the cylindrical permanent magnet is treated with a smooth and wear-resistant finish to reduce friction.

[0040] Preferably, the left friction ring 2 and the right friction ring 4 adopt an L-shaped structure. The surface of the L-shaped structure of the left friction ring 2 that contacts the left side plate 301 of the inner shell is treated with a smooth and wear-resistant finish, such as by spraying a wear-resistant material onto the surface, to reduce the coefficient of friction and improve wear resistance. The right friction ring 4 is symmetrical to the left friction ring 2. The surface of the L-shaped structure of the right friction ring 4 that contacts the right side plate 302 of the inner shell is treated with a smooth and wear-resistant finish, such as by spraying a wear-resistant material onto the surface, to reduce the coefficient of friction and improve wear resistance. The right friction ring 4 and the left friction ring 2 provide support and positioning for the inner shell assembly 3. In this invention, refer to the attached... Figure 3 A small gap is left between the friction ring and the inner shell side plate to prevent jamming.

[0041] In actual installation, this invention, such as Figures 1-3 As shown, after the main shaft 11 and the outer casing 1 are installed, the left friction ring 2 is installed on the inner wall of the outer casing 1, then the left side plate 301 of the inner casing is installed on the left friction ring 2, then the impeller 8 is installed at the end of the main shaft 11, then the right side plate 302 of the inner casing is installed on the left side plate 301 of the inner casing, then the right friction ring 4 is installed on the distributor plate 6, then the distributor plate 6 is installed, and finally the end cover 5 is installed.

[0042] In practical use, the motor drives the main shaft 11 to rotate, which in turn drives the impeller 8 to rotate. During the pumping process, the impeller 8 causes the liquid to form a liquid ring. The liquid ring drives the inner shell assembly 3 to rotate around the left friction ring 2 and the right friction ring 4, reducing the friction between the liquid ring and the original inner wall of the outer shell 1. During rotation, the pressure relief hole 303 plays a pressure relief role, that is, it reduces the pressure difference between the inner and outer sides of the inner shell assembly 3, thereby reducing the friction on the friction ring when the inner shell assembly 3 rotates. Compared with the prior art, the liquid ring rotates directly on the inner wall of the outer shell 1, which reduces the friction between the liquid ring and the inner wall of the outer shell 1, thereby improving the working efficiency of the drive motor and saving resources.

[0043] This invention addresses the problems of high resistance and low efficiency in traditional liquid ring pumps by proposing a liquid ring pump with a double-shell structure. The outer shell of this novel pump is fixed, while the inner shell with a porous structure can rotate with the liquid ring, resulting in advantages such as low operating resistance and high efficiency.

[0044] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A porous inner shell liquid ring pump, comprising a base (7), on which a housing (1) is mounted, a main shaft (11) is movably connected to the middle of the housing (1), an impeller (8) is provided at the end of the main shaft (11), the impeller (8) is located inside the housing (1), an end cover (5) is detachably connected to one side of the housing (1), and a flow divider (6) is provided at the connection between the housing (1) and the end cover (5), characterized in that: An inner shell assembly (3) is movably provided on the inner wall of the outer shell (1). A pressure relief hole (303) is provided on the inner shell assembly (3). When the impeller (8) rotates to form a liquid ring, the pressure relief hole (303) maintains the pressure balance between the inner wall and the outer wall of the inner shell assembly (3). When the liquid ring rotates, the friction force generated between it and the inner wall of the inner shell assembly (3) drives the inner shell assembly (3) to rotate relative to the inner wall of the outer shell (1). The inner shell assembly (3) includes an inner shell left side plate (301) and an inner shell right side plate (302). A left friction ring (2) is installed on the boss inside the outer shell (1) by an interference fit. The inner shell left side plate (301) is installed on the left friction ring (2). The inner shell right side plate (302) is fixedly connected to the inner shell left side plate (301) by a mortise and tenon structure or by screws. A right friction ring (4) is installed on the diverter plate (6) by an interference fit. The right friction ring (4) is compatible with the inner shell right side plate (302).

2. The porous inner shell liquid ring pump according to claim 1, characterized in that: When the impeller (8) rotates to form a liquid ring, both the left friction ring (2) and the right friction ring (4) are located inside the liquid ring.

3. The porous inner shell liquid ring pump according to claim 1, characterized in that: The end cap (5) is fixedly connected to the outer shell (1) by bolts; the contact surface between the end cap (5) and the outer shell (1) is sealed with a sealing ring, and the contact surface between the diverter plate (6) and the outer shell (1) is sealed with a sealing ring.

4. A porous inner shell liquid ring pump according to claim 1, characterized in that: The pressure relief holes (303) are evenly distributed in an array, and the pressure relief holes (303) are round holes, strip holes or square holes.

5. A porous inner shell liquid ring pump according to claim 1, characterized in that: The main shaft (11) passes through the left shaft hole, mechanical seal (9), and bearing (10) of the housing (1) in sequence, and then is connected to the motor shaft via a coupling.

6. A porous inner shell liquid ring pump according to claim 2, characterized in that: The left arm of the inner shell left side plate (301) is larger than the right arm of the inner shell left side plate (301). The left arm of the inner shell left side plate (301) is adapted to the left friction ring (2). The dimensions of the inner shell right side plate (302) and the right arm of the inner shell left side plate (301) after installation are the same as the dimensions of the left arm of the inner shell left side plate (301).

7. A porous inner shell liquid ring pump according to claim 6, characterized in that: The contact surface between the left side plate (301) of the inner shell and the left friction ring (2) is treated with a smooth and wear-resistant finish; similarly, the contact surface between the right side plate (302) of the inner shell and the right friction ring (4) is treated with a smooth and wear-resistant finish; the outer wall surface of the left side plate (301) of the inner shell is treated with a smooth finish to reduce friction.

8. A porous inner shell liquid ring pump according to claim 7, characterized in that: The left friction ring (2) and the right friction ring (4) adopt an L-shaped structure. The L-shaped surface of the left friction ring (2) is smooth and wear-resistant at the position where it contacts the left side plate (301) of the inner shell. The right friction ring (4) is symmetrical to the left friction ring (2). The L-shaped surface of the right friction ring (4) is smooth and wear-resistant at the position where it contacts the right side plate (302) of the inner shell. The right friction ring (4) and the left friction ring (2) play a supporting and positioning role for the inner shell assembly (3).

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