Centrifugal corrosion-resistant pump

Abstract

The application relates to the technical field of industrial wastewater treatment, in particular to a centrifugal corrosion-resistant pump, which comprises a pump body, the water inlet pipe of the pump body is in a right-angle tubular shape, a circular shaft is arranged through the inside of the water inlet pipe, and the circular shaft is coaxially arranged with a driving shaft of the pump body; a centering assembly is arranged on the coaxial part of the water inlet pipe and the circular shaft; a transmission assembly is arranged at the center position of an impeller of the pump body; a sealing connection assembly is arranged at the position where the circular shaft penetrates through the water inlet pipe; and a warning assembly is arranged at one end of the circular shaft; when the impeller is eccentric, the rotating impeller drives the other end of the circular shaft to make circumferential movement around the axis of the driving shaft through the transmission assembly, so that the one end of the circular shaft also makes circumferential movement around the axis of the driving shaft, and the warning assembly is driven to operate and give a warning; compared with the prior art, the application can detect the eccentricity of the center of the impeller and give an early warning in time through the warning assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial wastewater treatment, in particular to a centrifugal corrosion-resistant pump. BACKGROUND

[0002] Industrial wastewater usually carries corrosive substances, so in order to transport industrial wastewater to a designated location for centralized treatment, a corrosion-resistant pump needs to be used; the corrosion-resistant pump is a pump with corrosion-resistant function, and the centrifugal corrosion-resistant pump is a common corrosion-resistant pump.

[0003] For example, the Chinese utility model patent with the publication number CN203023068U discloses a high-temperature-resistant and corrosion-resistant centrifugal pump. The high-temperature-resistant and corrosion-resistant centrifugal pump comprises a pump body and an impeller arranged in the pump body; wherein the inner surface of the pump body is provided with a high-temperature-resistant and corrosion-resistant layer. The high-temperature-resistant and corrosion-resistant centrifugal pump can stably transport corrosive fluid medium for a long time, has long service life, is simple to process, safe and low in cost.

[0004] However, the current corrosion-resistant centrifugal pump still has the following shortcomings in use:

[0005] During use of the corrosion-resistant centrifugal pump, the impeller inside the pump rotates at high speed to complete the delivery of liquid by using centrifugal force. During this process, the impeller may be eccentric, that is, the center of the impeller deviates from the axis of the motor driving shaft, so that the stability of the impeller during rotation is poor, which not only causes the operating noise of the pump body to increase, but more importantly, if not repaired in time, the impeller will be damaged.

[0006] Therefore, the present application provides a centrifugal corrosion-resistant pump to solve the above problems. SUMMARY

[0007] The present application aims to provide a centrifugal corrosion-resistant pump to solve the problems in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a centrifugal corrosion-resistant pump, comprising a pump body, wherein the water inlet pipe of the pump body is in a right-angle pipe shape, and a circular shaft is arranged inside the water inlet pipe, and the circular shaft is coaxially arranged with the driving shaft of the pump body;

[0009] The part of the water inlet pipe coaxial with the circular shaft is provided with a centering assembly, the center position of the impeller of the pump body is provided with a transmission assembly, the position of the circular shaft penetrating through the water inlet pipe is provided with a sealing connection assembly, and one end of the circular shaft is provided with a warning assembly;

[0010] When the impeller is eccentric, the rotating impeller drives the other end of the circular shaft to make a circular motion around the axis of the drive shaft through the transmission assembly, so that one end of the circular shaft also makes a circular motion around the axis of the drive shaft, and drives the warning assembly to operate and issue a warning.

[0011] Preferably, one side of the water inlet pipe is fixedly connected with a protection cylinder coaxially arranged with the drive shaft.

[0012] The warning assembly comprises an annular capsule and an extension rod.

[0013] The inside of the annular capsule is filled with liquid, and the outer peripheral surface of the annular capsule is fixed on the inner peripheral surface of the protection cylinder.

[0014] The inner diameter of the annular capsule is equal to that of the circular shaft, and the annular capsule is coaxially sleeved on one end of the circular shaft.

[0015] The extension rod comprises a sleeve, a rod body and a piston, the bottom end of the rod body is fixedly connected with the piston, the piston is slidingly and sealingly connected in the inside of the sleeve, and the bottom end of the sleeve is in communication with the annular capsule.

[0016] Preferably, the top end of the rod body protrudes from the top of the sleeve and is fixedly connected with a rectangular plate, the outer peripheral surface of the sleeve is fixedly connected with a rectangular cylinder, the rectangular plate is inserted into the inside of the rectangular cylinder, and the part of the rectangular plate located in the inside of the rectangular cylinder is provided with a warning area.

[0017] Preferably, the sealing connection assembly comprises a compression ring, a first annular plate and a first straight spring.

[0018] The first annular plate is coaxially sleeved and fixed on the circular shaft.

[0019] The two ends of the first straight spring are fixedly connected with the compression ring and the first annular plate respectively, and the compression ring and the first straight spring are coaxially arranged with the circular shaft, a connecting hole is formed in the water inlet pipe for the circular shaft to penetrate through, the compression ring tightly fixes the rubber sheet on the outside of the connecting hole, and the circular shaft sealingly penetrates through the rubber sheet.

[0020] Preferably, a connecting seat is fixed on the water inlet pipe, a through hole is formed in the connecting seat and is in communication with the connecting hole, and the compression ring tightly fixes the rubber sheet on the connecting seat.

[0021] Preferably, the centering assembly comprises an annular groove arranged on the inner wall surface of the water inlet pipe and a second annular plate arranged in the inside of the annular groove, the second annular plate is elastically connected with the inner wall surface of the annular groove, and the second annular plate is fixedly connected with the circular shaft through a connecting shaft.

[0022] Preferably, the centering assembly further comprises a plurality of second straight springs.

[0023] The axis of the second straight spring is parallel to the axis of the circular shaft, and both end surfaces of the second annular plate are fixedly connected to the two annular plate surfaces of the annular groove through the second straight spring.

[0024] Preferably, the transmission assembly includes a cylinder and a plurality of rollers;

[0025] The cylinder is concentrically arranged with the impeller;

[0026] The plurality of rollers are connected to the inner circumference of the cylinder in an annular shape;

[0027] The diameter of the roller gradually decreases from its axial middle position to both ends, and the axial middle position of the roller is rollingly connected with the other end of the circular shaft.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The centrifugal corrosion-resistant pump of the present invention can center the part of the circular shaft at the position of the centering component through the set centering component, so that the center of the part is always on the axis of the drive shaft, and then the center of the other end of the circular shaft is aligned with the center of the impeller through the transmission component. When the center of the impeller deviates from the axis of the drive shaft, the high-speed rotation of the drive shaft will drive the center of the impeller to make a circular motion around the axis of the drive shaft itself, so that under the action of the transmission component, the center of the other end of the circular shaft follows the center of the impeller to make a circular motion around the axis of the drive shaft. Since the center of the part of the circular shaft corresponding to the centering component is always on the axis of the drive shaft, the center of one end of the circular shaft can also make a circular motion around the axis of the drive shaft, thereby driving the warning component to operate to issue a warning, so that the staff can deal with the problem of impeller eccentricity in time according to the warning issued by the warning component.

[0030] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 For the present invention Figure 1 A schematic diagram of a partial cross-sectional structure;

[0033] Figure 3 For the present invention Figure 2 Schematic diagram of the local structure;

[0034] Figure 4 For the present invention Figure 2 A in the middle is an enlarged structural diagram;

[0035] Figure 5 For the present inventionFigure 2 Enlarged structural schematic view at B;

[0036] Figure 6 Enlarged structural schematic view at B; Figure 2 Enlarged structural schematic view at C;

[0037] Figure 7 Side view structural schematic view of the warning assembly of the present application;

[0038] Figure 8 Enlarged structural schematic view at B; Figure 7 Partial sectional view structural schematic view of the present application;

[0039] Figure 9 Structural schematic view of the circular shaft of the present application;

[0040] Figure 10 Side view structural schematic view of the second annular plate of the present application.

[0041] In the figure: 1, pump body; 11, pump shell; 12, water inlet pipe; 13, drive shaft; 14, impeller; 2, circular shaft; 21, sealing connection assembly; 211, press ring; 212, first annular plate; 213, first straight spring; 214, connecting seat; 2141, through hole; 215, rubber sheet; 216, protective cylinder; 22, centering assembly; 221, annular groove; 222, second annular plate; 223, second straight spring; 224, connecting shaft; 23, transmission assembly; 231, cylinder; 232, roller; 24, warning assembly; 241, annular capsule; 242, telescopic rod; 2421, sleeve; 2422, rod body; 2423, piston; 243, rectangular cylinder; 244, rectangular plate; 245, warning area. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0043] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "vertical", "upper", "lower", "horizontal" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0044] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] Please refer to Figures 1-10 The embodiment provides a centrifugal corrosion-resistant pump, comprising a pump body 1, the pump body 1 comprises a pump shell 11, a water inlet pipe 12, a water outlet pipe (not numbered in the figure), a driving shaft 13 and an impeller 14; The general working principle is as follows: the motor (not shown in the figure) of the pump body 1 drives the impeller 14 to rotate at high speed through the driving shaft 13, the external wastewater is sucked into the inside of the pump shell 11 through the water inlet pipe 12, and then the wastewater in the pump shell 11 is discharged through the water outlet pipe (not numbered in the figure) by the action of centrifugal force; The above-mentioned is the conventional operation mode of the existing pump body 1, which will not be described further.

[0046] The improvements made by the present application with respect to the prior art are described in detail as follows.

[0047] As Figure 1 and Figure 2 The water inlet pipe 12 of the pump body 1 is a right-angle pipe. Specifically, from Figure 1 and Figure 2 , the water inlet pipe 12 has a horizontal section and a vertical section which are communicated with each other, and the flange plate of the water inlet pipe 12 is fixed at the top of the vertical section, so that the flange plate of the water inlet pipe 12 can be avoided from the axis of the driving shaft 13, to make space for the installation of the circular shaft 2, and also facilitate the connection between the pipeline and the flange plate of the water inlet pipe 12, avoiding the inconvenience caused by the circular shaft 2 for the connection between the pipeline and the water inlet pipe 12, wherein the pipeline refers to the input pipeline of the wastewater.

[0048] As Figure 2As shown, and the inside of the water inlet pipe 12 is provided with a circular shaft 2, the circular shaft 2 is coaxially arranged with the drive shaft 13 of the pump body 1; the part of the water inlet pipe 12 coaxial with the circular shaft 2 is provided with a centering assembly 22, the center position of the impeller 14 of the pump body 1 is provided with a transmission assembly 23, the position of the circular shaft 2 passing through the water inlet pipe 12 is provided with a sealing connection assembly 21, one end of the circular shaft 2 is provided with a warning assembly 24; when the impeller 14 is eccentric, the rotating impeller 14 drives the other end of the circular shaft 2 to make a circular motion around the axis of the drive shaft 13 through the transmission assembly 23, so that one end of the circular shaft 2 also makes a circular motion around the axis of the drive shaft 13, and drives the warning assembly 24 to operate and issue a warning. The sealing connection assembly 21 is used to seal the position of the circular shaft 2 passing through the water inlet pipe 12 to prevent wastewater leakage.

[0049] In the above scheme, through the setting of the centering assembly 22, the part of the circular shaft 2 at the position of the centering assembly 22 can be centered, so that the center of this part is always on the axis of the drive shaft 13, and then through the transmission assembly 23, the center of the other end of the circular shaft 2 is aligned with the center position of the impeller 14. When the center of the impeller 14 deviates from the axis of the drive shaft 13, the high-speed rotation of the drive shaft 13 will drive the center of the impeller 14 to make a circular motion around the axis of the drive shaft 13, so that under the action of the transmission assembly 23, the center of the other end of the circular shaft 2 also makes a circular motion around the axis of the drive shaft 13 along with the center of the impeller 14, and because the centering assembly 22 makes the center of the part of the circular shaft 2 corresponding to the centering assembly 22 always on the axis of the drive shaft 13, the center of one end of the circular shaft 2 can also make a circular motion around the axis of the drive shaft 13, thereby driving the warning assembly 24 to operate to issue a warning, so that the staff can handle the problem of the eccentricity of the impeller 14 in time according to the warning issued by the warning assembly 24.

[0050] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 , the specific structure and working principle of the warning assembly 24 are as follows:

[0051] As shown in Figure 1 , Figure 2 , one side of the water inlet pipe 12 is fixedly connected with a protective cylinder 216 coaxially arranged with the drive shaft 13; the protective cylinder 216 is in the shape of a cylinder as a whole, one end thereof is connected with the water inlet pipe 12, and the other end thereof is sealingly arranged, and a part of the circular shaft 2 is coaxially arranged in the interior of the protective cylinder 216.

[0052] As shown in Figure 3 , the warning assembly 24 comprises an annular capsule 241 and an extension rod 242;

[0053] The inside of the annular bag 241 is filled with liquid, such as hydraulic oil or water, and the outer periphery of the annular bag 241 is fixed to the inner periphery of the protective cylinder 216, so that the position of the annular bag 241 can be fixed and the annular bag 241 cannot slip.

[0054] The inner diameter of the annular bag 241 is equal to the diameter of the circular shaft 2, and the annular bag 241 is coaxially sleeved on one end of the circular shaft 2. When the one end of the circular shaft 2 moves circumferentially around the axis of the drive shaft 13, the circular shaft 2 will generate a pressing force on the annular bag 241, so that the liquid in the annular bag 241 is squeezed into the inside of the telescopic rod 242, so that the telescopic rod 242 is elongated, and the warning function is completed.

[0055] As shown in Figure 3 , the telescopic rod 242 includes a sleeve 2421, a rod body 2422, and a piston 2423. The bottom end of the rod body 2422 is fixedly connected with the piston 2423. The piston 2423 can be made of rubber material. The piston 2423 is slidingly and sealingly connected in the inside of the sleeve 2421. The bottom end of the sleeve 2421 is connected with the annular bag 241. The telescopic rod 242 is arranged in the radial direction of the protective cylinder 216. The telescopic rod 242 is arranged at the top of the protective cylinder 216, and the telescopic rod 242 is vertically arranged.

[0056] Further, in order to improve the warning effect of the warning assembly 24, as shown in Figure 7 and Figure 8 , the top end of the rod body 2422 protrudes from the top of the sleeve 2421 and is fixedly connected with a rectangular plate 244. The outer periphery of the sleeve 2421 is fixedly connected with a rectangular cylinder 243. The rectangular plate 244 is inserted into the inside of the rectangular cylinder 243. The part of the rectangular plate 244 located in the inside of the rectangular cylinder 243 is provided with a warning area 245. The warning area 245 can be a red paint coating. When the rod body 2422 is pushed out by the liquid in the inside of the annular bag 241, the rectangular plate 244 will also protrude from the inside of the rectangular cylinder 243, so that the warning area 245 is exposed to the outside environment, so as to be observed by the staff.

[0057] As shown in Figure 2 and Figure 4 , the sealing connection assembly 21 includes a compression ring 211, a first annular plate 212, and a first straight spring 213. The first annular plate 212 is coaxially and fixedly connected with the circular shaft 2. The two ends of the first straight spring 213 are fixedly connected with the compression ring 211 and the first annular plate 212, respectively. The compression ring 211 and the first straight spring 213 are coaxially arranged with the circular shaft 2. The inlet pipe 12 is provided with a connecting hole for the circular shaft 2 to penetrate. The compression ring 211 tightly fixes the rubber sheet 215 on the outside of the connecting hole. The circular shaft 2 sealingly penetrates the rubber sheet 215.

[0058] Further, the water inlet pipe 12 is fixed with a connecting seat 214, a through hole 2141 is formed in the connecting seat 214 and communicates with the connecting hole, and the compression ring 211 is used to compress and fix the rubber sheet 215 on the connecting seat 214.

[0059] The sealing connection assembly 21 is mainly used for realizing the sealing connection between the circular shaft 2 and the water inlet pipe 12 at the position where the circular shaft 2 penetrates out of the water inlet pipe 12, so as to prevent the waste water in the water inlet pipe 12 from leaking.

[0060] The specific structure and working principle of the centering assembly 22 are as follows:

[0061] As shown in Figure 5 and Figure 10 , the centering assembly 22 comprises an annular groove 221 arranged on the inner wall surface of the water inlet pipe 12 and a second annular plate 222 arranged in the annular groove 221, the second annular plate 222 is elastically connected with the inner wall surface of the annular groove 221, and the second annular plate 222 is fixedly connected with the circular shaft 2 through a connecting shaft 224. Further, the centering assembly 22 further comprises a plurality of second straight springs 223, the axis of the second straight spring 223 is parallel to the axis of the circular shaft 2, and the two end surfaces of the second annular plate 222 are fixedly connected with the two annular plate surfaces of the annular groove 221 through the second straight springs 223.

[0062] In actual use, the second annular plate 222 is fixed in the interior of the annular groove 221 through the plurality of second straight springs 223, and can keep the center of the part of the circular shaft 2 corresponding to the centering assembly 22 always on the axis of the driving shaft 13 under the action of the plurality of second straight springs 223, and the center of the part of the circular shaft 2 corresponding to the centering assembly 22 can always keep on the axis of the driving shaft 13 when the two ends of the circular shaft 2 move in a circular motion around the axis of the driving shaft 13.

[0063] As shown in Figure 6 , the transmission assembly 23 comprises a cylinder 231 and a plurality of rollers 232, the cylinder 231 is concentrically arranged with the impeller 14, so that the center of the other end of the circular shaft 2 is aligned with the center of the impeller 14, and the plurality of rollers 232 are annularly connected on the inner circumferential surface of the cylinder 231, the other end of the circular shaft 2 is clamped between the plurality of rollers 232, so that the center of the other end of the circular shaft 2 can be kept in stable alignment with the center of the impeller 14 for a long time.

[0064] As shown in Figure 6 , the diameter of the roller 232 gradually decreases from the axial middle position to the two ends, and the axial middle position of the roller 232 is in rolling connection with the other end of the circular shaft 2.

[0065] Working principle: in normal state, the motor (not numbered in the figure) of the pump body 1 drives the impeller 14 to rotate at high speed through the driving shaft 13, the external wastewater is sucked into the inside of the pump shell 11 through the water inlet pipe 12, and then the wastewater in the inside of the pump shell 11 is discharged through the water outlet pipe (not numbered in the figure) by using the action of centrifugal force, the impeller 14 and the driving shaft 13 are coaxially arranged at all times in the process;

[0066] Once the impeller 14 is in the state of disconnection between the center of the impeller 14 and the axis of the driving shaft 13 in the long-term use process or in the fault state, the center of the impeller 14 will make a circular motion around the axis of the driving shaft 13, so that the other end of the circular shaft 2 makes a circular motion around the axis of the driving shaft 13, as shown in Figure 9

[0067] Since the second annular plate 222 is fixed in the inside of the annular groove 221 through the plurality of second straight springs 223, and can keep the center of the part of the circular shaft 2 corresponding to the centering assembly 22 on the axis of the driving shaft 13 under the action of the plurality of second straight springs 223;

[0068] That is, the circular motion of the other end of the circular shaft 2 will drive the one end of the circular shaft 2 to make a circular motion, so that the one end of the circular shaft 2 extrudes the annular capsule 241, extrudes the liquid in the inside of the annular capsule 241 into the inside of the telescopic rod 242, makes the telescopic rod 242 elongate, drives the rectangular plate 244 to extend from the inside of the rectangular cylinder 243, exposes the warning area 245 to the outside environment, and completes the warning function;

[0069] In the whole process, since the circular shaft 2 is divided into left and right parts by the centering assembly 22, the length of the left part of the circular shaft 2 is greater than that of the right part, therefore, the circular center of the leftmost part of the circular shaft 2 will be enlarged when it is transmitted to the rightmost end of the circular shaft 2, and the enlargement ratio is proportional to the length of the left and right parts of the circular shaft 2, further, since the volume of the annular capsule 241 is much greater than that of the sleeve 2421, the volume change of the annular capsule 241 caused by the extrusion of the left end of the circular shaft 2 will be enlarged, so that the extension length of the rod body 2422 is also enlarged, that is, the circular shaft 2 will amplify the circular motion of the center of the impeller 14 around the axis of the driving shaft 13 by one level, and then amplify it by the annular capsule 241 by two levels, so that the small size deviation of the center of the impeller 14 will also be captured by the warning assembly 24, and the detection result is accurate.

[0070] Although the embodiments of the present application have been shown and described, it should be understood by those ordinary skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.​

Claims

1. A centrifugal corrosion-resistant pump, comprising a pump body (1), characterized in that: The water inlet pipe (12) of the pump body (1) is in the shape of a right-angle tube, and a circular shaft (2) is provided inside the water inlet pipe (12), and the circular shaft (2) is coaxially provided with the drive shaft (13) of the pump body (1); A centering assembly (22) is provided at the portion where the water inlet pipe (12) and the circular shaft (2) are coaxial, a transmission assembly (23) is provided at the center of the impeller (14) of the pump body (1), a sealing connection assembly (21) is provided at the position where the circular shaft (2) passes through the water inlet pipe (12), and a warning assembly (24) is provided at one end of the circular shaft (2); When the impeller (14) is eccentric, the rotating impeller (14) drives the other end of the circular shaft (2) to perform a circular motion around the axis of the drive shaft (13) through the transmission component (23), so that one end of the circular shaft (2) also performs a circular motion around the axis of the drive shaft (13), driving the warning component (24) to operate and issue a warning.

2. A centrifugal corrosion-resistant pump according to claim 1, characterized in that: A protective cylinder (216) coaxially arranged with the drive shaft (13) is fixedly connected to one side of the water inlet pipe (12); The warning component (24) includes an annular bag (241) and a telescopic rod (242); The interior of the annular bag (241) is filled with liquid, and the outer peripheral surface of the annular bag (241) is fixed on the inner peripheral surface of the protective tube (216); The inner diameter of the annular capsule (241) is equal to that of the circular shaft (2), and the annular capsule (241) is coaxially sleeved on one end of the circular shaft (2); The telescopic rod (242) includes a sleeve (2421), a rod body (2422) and a piston (2423). The bottom end of the rod body (2422) is fixedly connected to the piston (2423). The piston (2423) is slidingly and sealingly connected to the inside of the sleeve (2421). The bottom end of the sleeve (2421) is connected to the annular bag (241).

3. A centrifugal corrosion-resistant pump according to claim 2, characterized in that: The top end of the rod body (2422) extends out of the top of the sleeve (2421) and is fixedly connected to a rectangular plate (244); the outer peripheral surface of the sleeve (2421) is fixedly connected to a rectangular tube (243); the rectangular plate (244) is inserted into the interior of the rectangular tube (243); and a warning area (245) is provided on the portion of the rectangular plate (244) located inside the rectangular tube (243).

4. A centrifugal corrosion-resistant pump according to claim 1, characterized in that: The sealing connection assembly (21) includes a pressure ring (211), a first annular plate (212) and a first straight spring (213); The first annular plate (212) is coaxially sleeved and fixed on the circular shaft (2); The two ends of the first straight spring (213) are fixedly connected to the pressure ring (211) and the first annular plate (212) respectively, and the pressure ring (211) and the first straight spring (213) are both coaxially arranged with the circular shaft (2). A connecting hole for the circular shaft (2) to pass through is provided on the water inlet pipe (12), and the pressure ring (211) presses and fixes the rubber sheet (215) on the outside of the connecting hole, and the circular shaft (2) seals and passes through the rubber sheet (215).

5. A centrifugal corrosion-resistant pump according to claim 4, characterized in that: A connecting seat (214) is fixed on the water inlet pipe (12), a through hole (2141) communicating with the connecting hole is provided on the connecting seat (214), and the pressure ring (211) presses and fixes the rubber sheet (215) on the connecting seat (214).

6. A centrifugal corrosion-resistant pump according to claim 1, characterized in that: The centering assembly (22) comprises an annular groove (221) provided on the inner wall surface of the water inlet pipe (12) and a second annular plate (222) provided inside the annular groove (221); the second annular plate (222) is elastically connected to the inner wall surface of the annular groove (221), and the second annular plate (222) is fixedly connected to the circular shaft (2) via a connecting shaft (224).

7. A centrifugal corrosion-resistant pump according to claim 6, characterized in that: The centering assembly (22) further includes a plurality of second straight springs (223); The axis of the second straight spring (223) is parallel to the axis of the circular shaft (2), and both end surfaces of the second annular plate (222) are fixedly connected to the two annular plate surfaces of the annular groove (221) through the second straight spring (223).

8. The centrifugal corrosion-resistant pump according to claim 1, characterized in that: The transmission assembly (23) includes a cylinder (231) and a plurality of rollers (232); The cylinder (231) and the impeller (14) are arranged concentrically; The plurality of rollers (232) are connected to the inner circumference of the cylinder (231) in an annular shape; The diameter of the roller (232) gradually decreases from its axial middle position toward both ends, and the axial middle position of the roller (232) is rollingly connected to the other end of the circular shaft (2).

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