Vertical low-cavitation pump convenient to disassemble

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a vertical low-cavitation pump convenient to disassemble, which comprises a centrifugal pump body, an impeller mounted in the centrifugal pump body, a main shaft sleeved on the impeller, a pump cover mounted at the upper end of the centrifugal pump body, a mechanical sealing block mounted on the top surface of the pump cover, and a bearing body arranged on the mechanical sealing block. A connecting frame is fixedly arranged on the outer wall of the centrifugal pump body, a motor is installed on the top face of the connecting frame through an installation base, an output shaft is rotationally connected to the motor, and coupler assemblies are arranged at the upper end and the lower end of the middle shaft correspondingly; the coupling assembly is provided with two coupling sleeves, and one coupling sleeve is arranged on the peripheral wall of the main shaft in a sleeving mode. The anti-cavitation performance is improved, liquid leakage and vaporization are prevented, when the main shaft of the pump body of the centrifugal pump needs to be maintained or replaced, the pump body of the centrifugal pump does not need to be disassembled or a motor does not need to be moved, and maintenance convenience and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a vertical, easily disassembled, low-cavitation pump. Background Art

[0002] A centrifugal pump is a pump that transports liquid by the centrifugal force generated by the rotation of the impeller. Cavitation in a centrifugal pump is a process in which the liquid pressure at the impeller inlet drops below the saturated vapor pressure during operation, causing the liquid to vaporize and form bubbles. The bubbles then condense after entering the high-pressure area, causing the surrounding liquid to rush toward the center of the bubbles at high speed, generating high pressure that impacts the impeller surface and damages the impeller.

[0003] After searching, a Chinese patent with the publication number CN216665927U provides a vibration-damping and anti-cavitation centrifugal pump, comprising a centrifugal pump, a vibration-damping device, and an anti-cavitation device. The vibration-damping device is fixedly connected to the bottom of the centrifugal pump, and the anti-cavitation device comprises a double-layer water pumping pipe, a filter water pumping box, and a liquid level relay. By providing the filter water pumping box, the pump body is isolated from damage by impurities in the pumped liquid, thereby improving the cavitation margin of the centrifugal pump. By providing a tip protrusion on the blade, the tip protrusion ruptures the bubbles before the bubbles contact the blade, reducing the accumulation of bubbles on the blade, and effectively preventing the bubbles from causing cavitation damage to the blade.

[0004] However, during use, it was found that when the device faced maintenance needs such as mechanical seal wear, impeller damage or internal component inspection, it often required tedious disassembly of the pump body or movement of the heavy motor. This process was not only time-consuming and labor-intensive, but also increased maintenance costs and downtime, posing a challenge to production efficiency and equipment maintenance safety. It not only limited the flexibility of maintenance, but also increased the complexity and cost of maintenance. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides a vertical, easily disassembled low-cavitation pump, which solves the technical problem that when the device faces maintenance needs such as mechanical seal wear, impeller damage or internal component inspection, it is often necessary to tediously disassemble the pump body or move the heavy motor. This process is not only time-consuming and labor-intensive, but also increases maintenance costs and downtime, posing a challenge to production efficiency and equipment maintenance safety, and not only limits the flexibility of maintenance, but also increases the complexity and cost of maintenance.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a vertical detachable low-cavitation pump, comprising a centrifugal pump body, an impeller is installed inside the centrifugal pump body, a main shaft is sleeved on the impeller, a pump cover is installed on the upper end of the centrifugal pump body, a mechanical seal block is installed on the top surface of the pump cover, a bearing body is provided on the mechanical seal block, a bearing pressure cover is installed on the top surface of the bearing body, the outer peripheral wall of the main shaft is fixedly connected to the inner wall of the middle part of the bearing body, a central shaft is provided on the upper side of the main shaft, a coupling frame is fixedly provided on the outer wall of the centrifugal pump body, a motor is installed on the top surface of the coupling frame through a mounting seat, and an output shaft is rotatably connected to the motor;

[0007] The upper and lower ends of the central shaft are respectively provided with coupling assemblies, and the coupling assembly is provided with two coupling sleeves, one of the coupling sleeves is sleeved on the outer peripheral wall of the main shaft, and the other coupling sleeve is sleeved on the outer peripheral wall of the output shaft.

[0008] Preferably, the coupling assembly includes a positioning gear, on which two positioning blocks are fixed in a symmetrical structure. Positioning grooves are respectively provided on the top surface of the main shaft, the two ends of the middle shaft and the bottom surface of the output shaft, and the positioning blocks and the positioning grooves are plug-fitted.

[0009] Through the above technical solution, the positioning block is plugged into the positioning grooves on the main shaft, the middle shaft and the output shaft, thereby achieving precise positioning and torque transmission between the various components.

[0010] Preferably, a gear groove is provided on the side of the coupling sleeve close to the positioning gear, and the inner wall of the coupling sleeve is respectively plugged into and fitted with the outer peripheral walls of the upper end of the main shaft, the two ends of the middle shaft and the lower end of the output shaft, and the coupling sleeve is snap-fitted with the positioning gear through the gear groove.

[0011] Through the above technical solution, the positioning gear and the gear groove are engaged, which improves the torque transmission between the positioning gear and the coupling sleeve, ensuring the accuracy and stability of power during the transmission process.

[0012] Preferably, a keyway is provided on the inner wall of the coupling sleeve, and flat keys are fixed on the outer peripheral walls of the upper end of the main shaft, the two ends of the middle shaft and the lower end of the output shaft, and the flat keys are plug-fitted into the keyway.

[0013] Through the above technical solution, the keyway on the inner wall of the coupling sleeve is plugged into and matched with the flat keys on the main shaft, the middle shaft and the output shaft, further enhancing the firmness of the connection and the reliability of torque transmission.

[0014] Preferably, the coupling sleeve is provided with two through holes in a symmetrical structure, and a hexagon socket bolt is inserted into the through hole. Threaded holes are respectively provided on the outer peripheral walls of the upper end of the main shaft, the two ends of the middle shaft and the lower end of the output shaft, and the threaded ends of the hexagon socket bolts are threadedly connected to the threaded holes.

[0015] Through the above technical solution, the threaded ends of the hexagon socket bolts pass through the through holes on the coupling sleeve and are threadedly connected to the corresponding threaded holes. The coupling sleeve is fixed by the hexagon socket bolts, which improves the installation and disassembly efficiency of the coupling sleeve.

[0016] Preferably, an internal thread groove is provided on the outer peripheral wall of the coupling sleeve, and the coupling sleeve is threadedly connected to a limiting sleeve via an external thread. The inner wall of the limiting sleeve is provided with an external thread, and the outer wall of the limiting sleeve is hexagonal. The limiting sleeve is threadedly connected to the internal thread groove via an external thread, and the external thread of the limiting sleeve abuts against the two end edges of the nut end of the hexagonal bolt.

[0017] Through the above technical solution, the external thread of the fixed limit sleeve abuts against the edges of the two ends of the nut end of the hexagon socket bolt, reducing the loosening of the hexagon socket bolt when the main shaft, middle shaft and output shaft rotate, and enhancing the reliability of the connection.

[0018] Preferably, a retaining spring is abutted on the limiting sleeve, and arc-shaped grooves are respectively provided on the outer peripheral walls of the upper end of the main shaft, the two ends of the middle shaft and the lower end of the output shaft, and the retaining spring is engaged with the arc-shaped grooves.

[0019] Through the above technical solution, the corresponding retaining spring is pushed into the arc-shaped groove, and the retaining spring abuts against the limiting sleeve to fix it.

[0020] Beneficial effects of the utility model:

[0021] 1. After the motor is started, its output shaft begins to rotate, and the power of the motor is transmitted to the middle shaft through the coupling assembly, and then to the main shaft. At this time, the output shaft, middle shaft and main shaft rotate synchronously, and the main shaft drives the impeller to rotate inside the centrifugal pump body. The impeller generates centrifugal force to transport the liquid. In order to prevent the occurrence of cavitation, the centrifugal pump body adopts designs such as enlarging the impeller inlet and optimizing the blade shape to improve the anti-cavitation performance. At the same time, the mechanical seal block and its supporting sealing system also play a role in preventing liquid leakage and vaporization. When the main shaft of the centrifugal pump body needs to be repaired or replaced, the hexagon socket bolts are loosened to withdraw them from the threaded holes, and the fastening connections between the multiple coupling sleeves and the main shaft, middle shaft and output shaft are released respectively. Due to the design of the coupling assembly, this process does not require disassembling the centrifugal pump body or moving the motor, which improves the convenience and efficiency of maintenance.

[0022] 2. The coupling sleeves in the coupling assembly are respectively sleeved on the outer peripheral walls of the main shaft, the two ends of the middle shaft and the output shaft. The threaded ends of the hexagon socket bolts pass through the through holes on the coupling sleeves and are threadedly connected with the corresponding threaded holes. The coupling sleeves are fixed by the hexagon socket bolts, which improves the installation and disassembly efficiency of the coupling sleeves and ensures the continuity and stability of power transmission. The positioning blocks are plugged into the positioning grooves on the main shaft, the middle shaft and the output shaft to achieve precise positioning and torque transmission between the components. The positioning gear and the gear groove are clamped together to improve the torque transmission of the positioning gear and the coupling sleeve, ensuring the accuracy and stability of power during the transmission process. The keyway on the inner wall of the coupling sleeve is plugged into the flat key on the main shaft, the middle shaft and the output shaft to further enhance the firmness of the connection and the reliability of torque transmission.

[0023] 3. The external thread of the limit sleeve is threadedly connected to the internal thread groove on the outer peripheral wall of the coupling sleeve, so that the limit sleeve is fixed on the coupling sleeve, which increases the strength and stability of the connection. The outer wall of the limit sleeve is hexagonal, which is convenient for tightening or loosening with tools such as wrenches. The external thread of the limit sleeve after fixation abuts against the edges at both ends of the nut end of the hexagonal bolt, reducing the loosening of the hexagonal bolt when the main shaft, middle shaft and output shaft rotate, and enhancing the reliability of the connection. After tightening the limit sleeve on the coupling sleeve, push the corresponding retaining spring into the arc groove, and the retaining spring abuts against the limit sleeve to fix it, reducing the loosening of the limit sleeve when the main shaft, middle shaft and output shaft rotate, improving the stability of the connection, and reducing the occurrence of the hexagonal bolt falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the coupling sleeve structure of the utility model;

[0026] Figure 3 This is a schematic diagram of the assembly of the limit sleeve structure of the utility model;

[0027] Figure 4 This is a schematic diagram of the positioning gear structure of the utility model;

[0028] Figure 5 This is a schematic diagram of the assembly structure of the hexagon socket bolt of the utility model;

[0029] Figure 6 This is a bottom-view stereoscopic view of the limiting sleeve structure of the present utility model.

[0030] In the figure: 1. Centrifugal pump body; 2. Impeller; 3. Main shaft; 4. Pump cover; 5. Mechanical seal block; 6. Bearing body; 7. Bearing cover; 8. Central shaft; 9. Output shaft; 10. Connecting frame; 11. Motor; 12. Coupling assembly; 1201. Coupling sleeve; 1202. Positioning gear; 1203. Positioning block; 1204. Positioning groove; 1205. Gear groove; 1206. Keyway; 1207. Flat key; 1208. Through hole; 1209. Hexagon socket bolt; 1210. Threaded hole; 1211. Internal thread groove; 1212. Arc groove; 1213. Limit sleeve; 1214. Circlip. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings. Example 1

[0032] like Figures 1 to 6 As shown, this embodiment provides a vertical, easily disassembled, low-cavitation pump, including a centrifugal pump body 1, an impeller 2 is installed inside the centrifugal pump body 1, a main shaft 3 is sleeved on the impeller 2, a pump cover 4 is installed on the upper end of the centrifugal pump body 1, a mechanical seal block 5 is installed on the top surface of the pump cover 4, a bearing body 6 is provided on the mechanical seal block 5, a bearing body 6 is installed on the top surface of the bearing body 6, a bearing gland 7 is installed on the top surface of the bearing body 6, the outer peripheral wall of the main shaft 3 is fixedly connected to the inner wall of the middle part of the bearing body 6, a central shaft 8 is provided on the upper side of the main shaft 3, a coupling frame 10 is fixedly provided on the outer wall of the centrifugal pump body 1, a motor 11 is installed on the top surface of the coupling frame 10 through a mounting seat, and an output shaft 9 is rotatably connected to the motor 11;

[0033] The upper and lower ends of the central shaft 8 are respectively provided with coupling assemblies 12 , and the coupling assembly 12 is provided with two coupling sleeves 1201 , one coupling sleeve 1201 is sleeved on the outer peripheral wall of the main shaft 3 , and the other coupling sleeve 1201 is sleeved on the outer peripheral wall of the output shaft 9 .

[0034] The coupling assembly 12 includes a positioning gear 1202, on which two positioning blocks 1203 are fixed in a symmetrical structure. Positioning grooves 1204 are respectively provided on the top surface of the main shaft 3, the two ends of the central shaft 8 and the bottom surface of the output shaft 9. The positioning blocks 1203 and the positioning grooves 1204 are plugged into each other; the positioning blocks 1203 are plugged into the positioning grooves 1204 on the main shaft 3, the central shaft 8 and the output shaft 9, thereby realizing precise positioning and torque transmission between the components.

[0035] A gear groove 1205 is provided on one side of the coupling sleeve 1201 close to the positioning gear 1202. The inner wall of the coupling sleeve 1201 is respectively plugged into the outer peripheral walls of the upper end of the main shaft 3, the two ends of the middle shaft 8 and the lower end of the output shaft 9. The coupling sleeve 1201 is engaged with the positioning gear 1202 through the gear groove 1205. The engagement between the positioning gear 1202 and the gear groove 1205 improves the torque transmission between the positioning gear 1202 and the coupling sleeve 1201, thereby ensuring the accuracy and stability of the power during the transmission process.

[0036] A keyway 1206 is provided on the inner wall of the coupling sleeve 1201, and flat keys 1207 are fixed on the outer peripheral walls of the upper end of the main shaft 3, the two ends of the central shaft 8 and the lower end of the output shaft 9, and the flat keys 1207 are plugged into and matched with the keyway 1206; the keyway 1206 on the inner wall of the coupling sleeve 1201 is plugged into and matched with the flat keys 1207 on the main shaft 3, the central shaft 8 and the output shaft 9, further enhancing the firmness of the connection and the reliability of torque transmission.

[0037] The coupling sleeve 1201 is symmetrically structured with two through holes 1208, and a hexagon socket bolt 1209 is inserted into the through hole 1208. Threaded holes 1210 are respectively provided on the outer peripheral walls of the upper end of the main shaft 3, the two ends of the middle shaft 8 and the lower end of the output shaft 9, and the threaded ends of the hexagon socket bolts 1209 are threadedly connected with the threaded holes 1210; the threaded ends of the hexagon socket bolts 1209 pass through the through holes 1208 on the coupling sleeve 1201 and are threadedly connected with the corresponding threaded holes 1210 respectively. The coupling sleeve 1201 is fixed by the hexagon socket bolts 1209, which improves the installation and disassembly efficiency of the coupling sleeve 1201.

[0038] Working principle: After the motor 11 is started, its output shaft 9 begins to rotate, and the power of the motor 11 is transmitted to the central shaft 8 through the coupling assembly 12, and then to the main shaft 3. At this time, the output shaft 9, the central shaft 8 and the main shaft 3 rotate synchronously, and the main shaft 3 drives the impeller 2 to rotate inside the centrifugal pump body 1. The impeller 2 generates centrifugal force to transport the liquid. In order to prevent the occurrence of cavitation, the centrifugal pump body 1 adopts designs such as enlarging the impeller 2 inlet and optimizing the blade shape to improve the anti-cavitation performance. At the same time, the mechanical seal block 5 and its supporting sealing system also play a role in preventing liquid leakage and vaporization;

[0039] The coupling sleeves 1201 in the coupling assembly 12 are respectively sleeved on the outer peripheral walls of the main shaft 3, the ends of the middle shaft 8 and the output shaft 9. The threaded ends of the hexagon socket bolts 1209 pass through the through holes 1208 on the coupling sleeves 1201 and are threadedly connected with the corresponding threaded holes 1210. The coupling sleeves 1201 are fixed by the hexagon socket bolts 1209, which improves the installation and disassembly efficiency of the coupling sleeves 1201 and ensures the continuity and stability of power transmission. The positioning block 1203 is connected to the main shaft 3, the middle shaft 8 and the output shaft 9. The positioning groove 1204 on the output shaft 9 is plugged in and fits together, achieving precise positioning and torque transmission between the various components. The engagement between the positioning gear 1202 and the gear groove 1205 improves the torque transmission between the positioning gear 1202 and the coupling sleeve 1201, ensuring the accuracy and stability of power transmission. The key groove 1206 on the inner wall of the coupling sleeve 1201 plugs in and fits with the flat key 1207 on the main shaft 3, the middle shaft 8, and the output shaft 9, further enhancing the firmness of the connection and the reliability of torque transmission.

[0040] When the main shaft 3 of the centrifugal pump body 1 needs to be repaired or replaced, the hexagon socket bolt 1209 is loosened to withdraw it from the threaded hole 1210, and the fastening connections between the multiple coupling sleeves 1201 and the main shaft 3, the middle shaft 8 and the output shaft 9 are released respectively. Due to the design of the coupling assembly 12, this process does not require disassembly of the centrifugal pump body 1 or the mobile motor 11, thereby improving the convenience and efficiency of maintenance. Example 2

[0041] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, on the basis of Example 1, an internal thread groove 1211 is provided on the outer wall of the coupling sleeve 1201, and a limiting sleeve 1213 is threadedly connected to the coupling sleeve 1201 through an external thread. The inner wall of the limiting sleeve 1213 is provided with an external thread, and the outer wall of the limiting sleeve 1213 is hexagonal. The limiting sleeve 1213 is threadedly connected to the internal thread groove 1211 through an external thread, and the external thread of the limiting sleeve 1213 abuts against the two end edges of the nut end of the hexagon socket bolt 1209; after being fixed, the external thread of the limiting sleeve 1213 abuts against the two end edges of the nut end of the hexagon socket bolt 1209, which reduces the loosening of the hexagon socket bolt 1209 when the main shaft 3, the middle shaft 8 and the output shaft 9 rotate, and enhances the reliability of the connection.

[0042] A retaining spring 1214 is in contact with the limiting sleeve 1213, and arc-shaped grooves 1212 are respectively provided on the outer peripheral walls of the upper end of the main shaft 3, the two ends of the middle shaft 8 and the lower end of the output shaft 9, and the retaining spring 1214 is engaged with the arc-shaped groove 1212; the corresponding retaining spring 1214 is pushed into the arc-shaped groove 1212, and the retaining spring 1214 is in contact with the limiting sleeve 1213 to fix it.

[0043] When in use, the external thread of the limiting sleeve 1213 is threadedly connected with the internal thread groove 1211 on the outer peripheral wall of the coupling sleeve 1201, so that the limiting sleeve 1213 is fixed on the coupling sleeve 1201, which increases the strength and stability of the connection. The outer wall of the limiting sleeve 1213 is hexagonal, which is convenient for tightening or loosening with tools such as wrenches. The external thread of the limiting sleeve 1213 after being fixed abuts against the edges of the two ends of the nut end of the hexagon socket bolt 1209, which reduces the loosening of the hexagon socket bolt 1209 when the main shaft 3, the middle shaft 8 and the output shaft 9 rotate, thereby enhancing the reliability of the connection;

[0044] After fastening the limit sleeve 1213 to the coupling sleeve 1201, push the corresponding retaining spring 1214 into the arc-shaped groove 1212. The retaining spring 1214 abuts against the limit sleeve 1213 to fix it, reducing the loosening of the limit sleeve 1213 when the main shaft 3, the middle shaft 8 and the output shaft 9 rotate, improving the stability of the connection, and reducing the occurrence of the hexagon socket bolt 1209 falling off.

[0045] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vertical, easily dismantled, low-cavitation pump, comprising a centrifugal pump body (1), characterized in that: An impeller (2) is installed inside the centrifugal pump body (1), a main shaft (3) is sleeved on the impeller (2), a pump cover (4) is installed on the upper end of the centrifugal pump body (1), a mechanical seal block (5) is installed on the top surface of the pump cover (4), a bearing body (6) is provided on the mechanical seal block (5), a bearing cover (7) is installed on the top surface of the bearing body (6), an outer peripheral wall of the main shaft (3) is fixedly connected to the inner wall of the middle part of the bearing body (6), a central shaft (8) is provided on the upper side of the main shaft (3), a connecting frame (10) is fixedly provided on the outer wall of the centrifugal pump body (1), a motor (11) is installed on the top surface of the connecting frame (10) through a mounting seat, and an output shaft (9) is rotatably connected to the motor (11); The upper and lower ends of the central shaft (8) are respectively provided with coupling assemblies (12), and the coupling assembly (12) is provided with two coupling sleeves (1201), one of the coupling sleeves (1201) is sleeved on the outer peripheral wall of the main shaft (3), and the other coupling sleeve (1201) is sleeved on the outer peripheral wall of the output shaft (9).

2. The vertical detachable low cavitation pump according to claim 1, characterized in that: The coupling assembly (12) includes a positioning gear (1202), two positioning blocks (1203) are fixedly provided on the positioning gear (1202) in a symmetrical structure, and positioning grooves (1204) are respectively provided on the top surface of the main shaft (3), the two ends of the middle shaft (8) and the bottom surface of the output shaft (9), and the positioning blocks (1203) and the positioning grooves (1204) are plug-fitted.

3. The vertical detachable low cavitation pump according to claim 1, characterized in that: A gear groove (1205) is provided on one side of the coupling sleeve (1201) close to the positioning gear (1202). The inner wall of the coupling sleeve (1201) is respectively plug-fitted with the outer peripheral walls of the upper end of the main shaft (3), the two ends of the middle shaft (8), and the lower end of the output shaft (9). The coupling sleeve (1201) is snap-fitted with the positioning gear (1202) via the gear groove (1205).

4. The vertical detachable low cavitation pump according to claim 3, characterized in that: A keyway (1206) is provided on the inner wall of the coupling sleeve (1201), and flat keys (1207) are fixed on the outer peripheral walls of the upper end of the main shaft (3), the two ends of the middle shaft (8), and the lower end of the output shaft (9), and the flat keys (1207) are plug-fitted into the keyway (1206).

5. The vertical detachable low cavitation pump according to claim 4, characterized in that: The coupling sleeve (1201) is provided with two through holes (1208) in a symmetrical structure, and a hexagon socket bolt (1209) is inserted into the through hole (1208). Threaded holes (1210) are respectively provided on the outer peripheral walls of the upper end of the main shaft (3), the two ends of the middle shaft (8) and the lower end of the output shaft (9), and the threaded ends of the hexagon socket bolts (1209) are threadedly connected to the threaded holes (1210).

6. The vertical detachable low-cavitation pump according to claim 5, characterized in that: An internal thread groove (1211) is provided on the outer peripheral wall of the coupling sleeve (1201), and a limiting sleeve (1213) is threadedly connected to the coupling sleeve (1201) via an external thread. The inner wall of the limiting sleeve (1213) is provided with an external thread. The outer wall of the limiting sleeve (1213) is hexagonal, and the limiting sleeve (1213) is threadedly connected to the internal thread groove (1211) via an external thread. The external thread of the limiting sleeve (1213) abuts against the two end edges of the nut end of the hexagon socket bolt (1209).

7. The vertical detachable low-cavitation pump according to claim 6, characterized in that: A retaining spring (1214) is in contact with the limiting sleeve (1213), and arc-shaped grooves (1212) are respectively provided on the outer peripheral walls of the upper end of the main shaft (3), the two ends of the middle shaft (8), and the lower end of the output shaft (9), and the retaining spring (1214) is engaged with the arc-shaped grooves (1212).

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