Porous inner shell liquid ring pump

Abstract

The invention belongs to the technical field of vacuum pumps, and particularly relates to a porous inner shell liquid ring pump which comprises a base, an outer shell is installed on the base, a main shaft is movably connected to the middle of the outer shell, an impeller is arranged at the end of the main shaft and located in the outer shell, and an end cover is detachably connected to one side of the outer shell. A flow dividing disc is arranged at the connecting position of the outer shell and the end cover, an inner shell assembly is movably arranged on the inner wall of the circumference of the outer shell, pressure relief holes are formed in the inner shell assembly, and when the impeller rotates to form a liquid ring, the pressure relief holes maintain pressure balance of the inner wall and the outer wall of the inner shell assembly. When the liquid ring rotates, friction force generated by the liquid ring and the inner wall of the inner shell assembly drives the inner shell assembly to rotate relative to the circumferential inner wall of the outer shell. In order to solve the problems that a traditional liquid ring pump is large in resistance and low in efficiency, the liquid ring pump with the double-shell structure is provided, the outer shell of the novel pump is fixed, the inner shell with the porous structure can rotate along with a liquid ring, and the liquid ring pump has the advantages of being small in operation resistance and high in efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum pumps, and in particular relates to a porous inner shell liquid ring pump. Background Art

[0002] Water ring vacuum pump, also known as liquid ring vacuum pump, abbreviated as water ring pump or liquid ring pump, is an important negative pressure suction equipment. The main structural parts of water ring vacuum pump include: main shaft, impeller, pump casing, distribution plate, etc. The main feature of water ring vacuum pump is that the impeller is eccentrically installed in the pump casing. Its working principle is: when the impeller rotates, water or other liquid medium is subjected to centrifugal force to form a water ring (liquid ring) in the pump casing. The water ring flows continuously along the central axis of the pump casing (stator), and together with the rotor impeller blades, it forms an air suction chamber and an exhaust chamber with periodic volume changes, thereby realizing the air suction and exhaust functions. Make the working efficiency of the water ring pump low. Due to the significant friction of the water ring on the casing, the impeller has a large resistance to rotation, resulting in low efficiency of the water ring pump. The energy conversion efficiency of the existing industrial water ring pump is mainly between 15%-50%, and the average conversion efficiency is about 30%; in the mining field alone, the annual power consumption of medium and large liquid ring pumps in operation nationwide exceeds billions of degrees, and improving the efficiency of liquid ring pumps can significantly save electricity. Therefore, improving the efficiency of the liquid ring pump has become an urgent problem to be solved. For this reason, the present invention proposes a porous inner shell liquid ring pump. Summary of the invention

[0003] The object of the present invention is to provide a porous inner shell liquid ring pump, which can improve the energy conversion efficiency of the liquid ring pump and thus save resources.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A porous inner shell liquid ring pump comprises a base, an outer shell is mounted on the base, a main shaft is movably connected to the middle of the outer shell, an impeller is arranged at the end of the main shaft, the impeller is located inside the outer shell, an end cover is detachably connected to one side of the outer shell, a diverter plate is arranged at the connection between the outer shell and the end cover, an inner shell assembly is movably arranged at the circumferential inner wall of the outer shell, a pressure relief hole is opened 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, and the friction force generated by the liquid ring and the inner wall of the inner shell assembly when the liquid ring rotates drives the inner shell assembly to rotate relative to the circumferential inner wall of the outer shell.

[0006] Preferably, the inner shell assembly comprises 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 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 mortise and tenon structure technology or screws, a right friction ring is installed on the diverter plate by interference fit, and the right friction ring and the inner shell right side plate are adapted to each other.

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

[0008] Preferably, the end cover is fixedly connected to the outer shell by bolts; the contact surface between the end cover and the outer shell is sealed by a sealing ring, and the contact surface between the diverter plate and the outer shell is sealed by 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 through the left shaft hole of the housing, the mechanical seal, and the bearing in sequence, and then is connected to the motor shaft via a coupling.

[0011] Preferably, the size of the left side arm of the left side plate of the inner shell is larger than the size of the right side arm of the left side plate of the inner shell, the left side arm of the left side plate of the inner shell is adapted to each other, and the size of the right side plate of the inner shell and the right side arm of the left side plate of the inner shell after installation is the same as the size of the left side 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 to be smooth and wear-resistant to reduce the friction coefficient and improve the wear resistance; similarly, the contact surface between the right side plate of the inner shell and the right friction ring is treated to be smooth and wear-resistant to reduce the friction coefficient and improve the wear resistance; the outer wall surface of the left side plate of the inner shell is treated to be smooth and wear-resistant to reduce the friction resistance; the outer wall surface of the cylindrical permanent magnet is treated to be smooth and wear-resistant to reduce the friction resistance.

[0013] Preferably, the left friction ring and the right friction ring adopt an L-shaped structure, and the position where the L-shaped structure surface of the left friction ring contacts the left side plate of the inner shell is treated with smoothness and wear resistance to reduce the friction coefficient and improve wear resistance; the right friction ring is symmetrical with the left friction ring in structure, and the position where the L-shaped structure surface of the right friction ring contacts the right side plate of the inner shell is treated with smoothness and wear resistance to reduce the friction coefficient and improve wear resistance; the right friction ring and the left friction ring support and position the inner shell assembly.

[0014] The technical effects achieved by the present invention are:

[0015] Aiming at the problem of large resistance and low efficiency of traditional liquid ring pumps, the present invention proposes a liquid ring pump with a double shell structure. The outer shell of the new pump is fixed, and the inner shell with a porous structure can rotate with the liquid ring, which has the advantages of small running resistance and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2It is a schematic diagram of the overall structure of an inner shell assembly in a porous inner shell liquid ring pump of the present invention;

[0018] Figure 3 It is the position relationship between the left friction ring and the inner shell of the present invention and a partial enlarged view;

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

[0020] In the accompanying drawings, the components represented by the reference numerals are listed 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 DESCRIPTION

[0022] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0023] like Figure 1-Figure 4 As shown, a porous inner shell liquid ring pump includes a base 7, an outer shell 1 is installed on the base 7, a main shaft 11 is movably connected to the middle of the outer shell 1, an impeller 8 is arranged at the end of the main shaft 11, and the impeller 8 is located inside the outer shell 1. An end cover 5 is detachably connected to one side of the outer shell 1, a diverter plate 6 is arranged at the connection between the outer shell 1 and the end cover 5, an inner shell component 3 is movably arranged at the inner wall of the circumference of the outer shell 1, and a pressure relief hole 303 is opened on the inner shell component 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 component 3, and the friction force generated by the liquid ring and the inner wall of the inner shell component 3 when rotating drives the inner shell component 3 relative to the outer shell 1 circumferential inner wall rotates; the inner shell component 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 technology 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 adapted to each other, a gap is left between the outer wall surface of the inner shell component 3 and the inner wall surface of the outer shell 1, and the impeller 8 is eccentrically arranged inside the inner shell component 3.

[0024] In the present invention, since the inner shell component 3 is rotatably arranged on the friction ring, and a plurality of pressure relief holes 303 are left on the inner shell component 3, the pressure relief holes 303 play a pressure relief role, that is, reducing the effect of the pressure difference force of the fluid inside and outside the inner shell component 3, so as to reduce the friction force on the friction ring when the inner shell component 3 rotates; when the impeller 8 drives the liquid ring to rotate, the liquid ring drives the inner shell component 3 to rotate. Compared with the prior art in which the liquid ring directly rotates on the inner wall of the outer shell 1, the friction force between the liquid ring and the inner wall of the outer shell 1 is reduced, thereby improving the working efficiency of the drive motor and saving resources.

[0025] In the experimental process of the present invention, the inner housing assembly 3, the left friction ring 2 and the right friction ring 4 are not used in the comparative example, and the torque, speed and power consumption are compared to obtain the following data in Table 1 and Table 2. 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] It can be obtained from the data in Table 1 and Table 2 that the average speed of the spindle 11 in the prior art as a comparative example is 2745.8571r / min; however, the average speed of the spindle 11 in this embodiment is 2873.4285r / min; during the use of the liquid ring pump, the higher the speed, the faster the pumping rate, which shows that the pumping rate of this embodiment is fast. The fast pumping rate alone cannot indicate high electric energy conversion efficiency. Combining the torque data and the power consumption data, it can be seen that the average torque of the spindle 11 in this embodiment is 2.78Nm, which is lower than the torque of the spindle 11 in the comparative example of 3.9928Nm, indicating that the friction between the liquefied and the original inner wall of the shell 1 in this embodiment is greatly reduced. At the same time, the power consumption of this embodiment is also lower than that of the comparative example. In summary, less electric energy is used to pump more volume of liquid, ultimately improving the efficiency of the liquid ring pump and significantly saving electric energy.

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

[0032] In actual use of the present invention, when the left side plate 301 of the inner shell 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, the corresponding contact surfaces will generate heat due to friction. Since the left friction ring 2 and the right friction ring 4 are both located inside the liquid ring, the liquid in the pumping process can cool the left friction ring 2 and the right friction ring 4. At the same time, the liquid will produce a liquid film at the contact surface between the left side plate 301 of the inner shell and the left friction ring 2, and the liquid will produce a liquid film at the contact surface between the right side plate 302 of the inner shell and the right friction ring 4, further reducing the friction heat generated at the corresponding contact surfaces. Under the law of conservation of energy, the overall electric energy conversion efficiency of the liquid ring pump is further improved.

[0033] Preferably, the end cover 5 is fixedly connected to the outer shell 1 by bolts; the contact surface between the end cover 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 the present invention, a sealing structure is provided to ensure the sealing inside the liquid ring pump, thereby ensuring the use effect 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 the present invention, when the pressure relief hole 303 is not provided, the pressure difference between the inside and outside of the inner shell component 3 causes friction to be generated between the outer wall of the inner shell component 3 and the friction ring. By providing the pressure relief hole 303, a pressure relief effect is achieved, that is, the pressure difference force of the fluid inside and outside the inner shell component 3 is reduced, so as to reduce the friction force on the friction ring when the inner shell component 3 rotates, thereby reducing the energy consumed by frictional heat generation, further improving the working efficiency of the liquid ring pump, and saving electric energy.

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

[0038] Preferably, the size of the left arm of the left side plate 301 of the inner shell is larger than the size of the right arm of the left side plate 301 of the inner shell, the left arm of the left side plate 301 of the inner shell is adapted to each other, and the size of the right side plate 302 of the inner shell and the right arm of the left side plate 301 of the inner shell after installation is the same as the size of the left arm of the left side plate 301 of the inner shell.

[0039] Preferably, the contact surface between the left side plate 301 of the inner shell and the left friction ring 2 is treated to be smooth and wear-resistant, for example, the surface is sprayed with wear-resistant material to reduce the friction coefficient 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 to be smooth and wear-resistant, for example, the surface is sprayed with wear-resistant material to reduce the friction coefficient and improve wear resistance; the outer wall surface of the left side plate 301 of the inner shell is treated to be smooth and wear-resistant to reduce friction resistance; the outer wall surface of the cylindrical permanent magnet is treated to be smooth and wear-resistant to reduce friction resistance.

[0040] Preferably, the left friction ring 2 and the right friction ring 4 adopt an L-shaped structure, and the position where the L-shaped structure surface of the left friction ring 2 contacts the left side plate 301 of the inner shell is treated with smooth wear resistance, for example, the surface is sprayed with wear-resistant material to reduce the friction coefficient and improve the wear resistance; the right friction ring 4 is symmetrical with the left friction ring 2 in structure, and the position where the L-shaped structure surface of the right friction ring 4 contacts the right side plate 302 of the inner shell is treated with smooth wear resistance, for example, the surface is sprayed with wear-resistant material to reduce the friction coefficient and improve the wear resistance; the right friction ring 4 and the left friction ring 2 play a role in supporting and positioning the inner shell assembly 3; in the present 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 the actual installation process of the present invention, Figure 1-Figure 3 As shown, after the main shaft 11 and the outer shell 1 are installed, the left friction ring 2 is installed on the inner wall of the outer shell 1, and then the left side plate 301 of the inner shell is installed on the left friction ring 2, and then the impeller 8 is installed at the end of the main shaft 11, and then the right side plate 302 of the inner shell is installed on the left side plate 301 of the inner shell, and then the right friction ring 4 is installed on the diverter plate 6, and then the diverter plate 6 is installed and finally the end cover 5 is installed.

[0042] In actual use of the present invention, the motor drives the main shaft 11 to rotate, and the main shaft 11 drives the impeller 8 to rotate. In the process of pumping liquid, the impeller 8 drives the liquid to form a liquid ring, and the liquid ring drives the inner shell component 3 to rotate around the left friction ring 2 and the right friction ring 4, thereby reducing the friction between the liquid ring and the inner wall of the original outer shell 1. During the rotation process, the pressure relief hole 303 plays a pressure relief role, that is, reducing the pressure difference force of the fluid on the inner and outer sides of the inner shell component 3, so as to reduce the friction on the friction ring when the inner shell component 3 rotates; when the impeller 8 drives the liquid ring to rotate, the liquid ring drives the inner shell component 3 to rotate. Compared with the prior art in which the liquid ring directly rotates on the inner wall of the outer shell 1, the friction between the liquid ring and the inner wall of the outer shell 1 is reduced, thereby improving the working efficiency of the drive motor and saving resources.

[0043] Aiming at the problem of large resistance and low efficiency of traditional liquid ring pumps, the present invention proposes a liquid ring pump with a double shell structure. The outer shell of the new pump is fixed, and the inner shell with a porous structure can rotate with the liquid ring, which has the advantages of small running resistance and high efficiency.

[0044] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A porous inner shell liquid ring pump, comprising a base (7), a shell (1) being mounted on the base (7), a main shaft (11) being movably connected to the middle of the shell (1), an impeller (8) being arranged at the end of the main shaft (11), the impeller (8) being located inside the shell (1), an end cover (5) being detachably connected to one side of the shell (1), a diverter plate (6) being arranged at the connection between the shell (1) and the end cover (5), characterized in that: An inner shell component (3) is movably provided at the circumferential inner wall of the outer shell (1), and a pressure relief hole (303) is provided on the inner shell component (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 component (3). When the liquid ring rotates, the friction force generated between the liquid ring and the inner wall of the inner shell component (3) drives the inner shell component (3) to rotate relative to the circumferential inner wall of the outer shell (1).

2. A porous inner shell liquid ring pump according to claim 1, characterized in that: The inner shell assembly (3) comprises 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 means of 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 means of a mortise and tenon structure or screws; a right friction ring (4) is installed on the diverter plate (6) by means of interference fit; the right friction ring (4) and the inner shell right side plate (302) are mutually adapted.

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

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

5. 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 circular holes, strip holes or square holes.

6. A porous inner shell liquid ring pump according to claim 1, characterized in that: The main shaft (11) passes through the left 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.

7. A porous inner shell liquid ring pump according to claim 3, characterized in that: The size of the left side arm of the left side plate (301) of the inner shell is larger than the size of the right side arm of the left side plate (301) of the inner shell. The left side arm of the left side plate (301) of the inner shell is adapted to the left friction ring (2). The size of the right side plate (302) of the inner shell after installation is the same as the size of the left side arm of the left side plate (301) of the inner shell.

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

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

Images