Chemical pump equipment

Abstract

The utility model discloses chemical pump equipment which comprises a pump body, a bearing box connected to the pump body, a bearing pack arranged in the bearing box, a pump shaft with one end arranged in the bearing pack in a penetrating mode and an impeller in threaded connection with the other end of the pump shaft, the impeller is located in the pump body, and an extending sealing part is arranged on the impeller. The pump shaft is screwed on the extending sealing part and is limited to rotate relative to the impeller through a positioning part. According to the chemical pump equipment, the pump shaft can drive the impeller to rotate in the pump body after being connected with the motor, air flow is formed in the pump body to be used for conveying liquid, and the extension sealing part extending out of the pump body is arranged on the impeller, so that the pump shaft is connected with the pump body outside the pump body and does not make contact with corrosive liquid in an inner cavity of the pump body; therefore, the corrosion of the pump shaft is reduced or even avoided, and the service life of the pump shaft is prolonged; and by arranging the positioning part, the pump shaft cannot rotate in the circumferential direction, so that the condition of rotation looseness between the pump shaft and the impeller is effectively avoided, and the use safety of the chemical pump equipment is improved.

Description

Technical Field

[0001] The utility model relates to chemical pump equipment. Background Art

[0002] Chemical pumps are pumps that meet special requirements in chemical production, such as high temperature resistance, low temperature resistance, corrosion resistance, wear resistance, no leakage, and the ability to transport critical liquids. Chemical pumps can improve the requirements of pump products for corrosion caused by all chemicals except pure water through changes in materials or other structures. Due to its special requirements, chemical pumps have the advantages of stable and reliable performance, good performance, beautiful appearance, and easy use and maintenance. They are widely used in industry, urban water supply, drainage, farmland, orchard irrigation, etc.

[0003] Chemical pumps are usually composed of a pump body, a pump cover, an impeller, a pump shaft, a bearing box and a bearing assembly. One end of the pump shaft penetrates into the pump body and is threadedly connected to the impeller. The other end of the pump shaft is connected to the motor. The operation of the motor drives the impeller to rotate to drive the flow of liquid in the pump body. Since the pump shaft and the impeller need to rotate, there may be relative rotation in the loosening direction between the threaded impeller and the pump shaft, which may cause rotational looseness between the pump shaft and the pump body, affecting the use of the chemical pump; when the chemical pump is in use, in order to ensure the delivery of corrosion-resistant liquids, the impeller is usually made of high-strength and high-corrosion-resistant materials, but the pump shaft, as a transmission structure, also has certain strength and corrosion resistance, but it is inferior to the impeller. When the chemical pump is running to deliver corrosive liquids, the pump shaft is constantly contacted by the delivered liquid, resulting in a relatively low service life. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a chemical pump equipment to solve at least one problem mentioned in the background technology.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a chemical pump equipment including a pump body, a bearing box connected to one side of the pump body, a bearing group arranged in the bearing box, a pump shaft with one end inserted in the bearing group and an impeller threadedly connected to the other end of the pump shaft, wherein the impeller is located in the pump body, and an extended sealing portion extending to the outside of the pump body and blocking the pump body is provided on the side of the impeller facing the bearing box, the pump shaft is threadedly arranged on the extended sealing portion and limits the rotation of the pump shaft relative to the impeller through a positioning portion, so that the impeller is located outside the pump body and will not directly contact the liquid in the pump body, so that it will not be corroded by the corrosive liquid transported in the pump body, thereby improving the service life of the pump, and the positioning portion limits the rotation of the pump shaft in the circumferential direction to prevent the pump shaft from rotating loose when driven by the motor, thereby ensuring a firmer connection between the pump shaft and the impeller, thereby forming a double guarantee.

[0006] Furthermore, the pump body has an inlet, an outlet and a first installation port respectively connected to the inner cavity, the inlet and the first installation port are relatively distributed on both sides of the pump body and the first installation port is arranged facing the bearing box, the first installation port is blocked with a pump cover, and a first through-hole is opened on the pump cover along an axial direction, and the extended sealing portion seals through the first through-hole so that the pump shaft can drive the impeller in the pump body to rotate, and the liquid enters the pump body through the inlet and is discharged from the outlet.

[0007] Furthermore, the bearing box has an oil groove, and second mounting openings extending in the axial direction are formed on two opposite sides of the bearing box. The bearing group includes two bearings which are fixedly connected in the two second mounting openings respectively. The two second mounting openings are sealed with end covers that press inward against the bearings to block the second mounting openings and improve the stability of the bearings. Second through holes are opened in the axial direction on the two end covers. The pump shaft passes through the two second through holes and is fixedly connected to the inner rings of the two bearings and then passes out of the bearing box so that the bearing can pass through the oil groove. The oil groove is used to store lubricating oil for lubricating and cooling the bearings and the pump shaft.

[0008] Furthermore, the bearing box extends from the outer periphery of the second through hole toward the pump body on one side close to the pump body and is fixedly connected to the pump body to enclose a cavity connected to the outside, and the extended sealing portion includes a shaft handle extending axially from the side of the impeller facing away from the inlet toward the side of the bearing box, and the shaft handle seal passes through the first through hole and extends into the cavity, and the corresponding end of the pump shaft extends into the cavity, so that the connection and coordination between the extended sealing portion and the pump shaft are carried out outside the pump body and the oil tank.

[0009] Furthermore, the extended sealing portion also includes a mechanical seal located in the cavity and sleeved on the shaft handle, the mechanical seal and the shaft handle jointly block the first perforation to prevent liquid leakage in the pump body without affecting the rotation of the pump shaft and the impeller, and the end of the shaft handle away from the impeller passes through the inner hole of the mechanical seal to separate the pump shaft from the inner cavity of the pump body to prevent the pump shaft from being corroded by the liquid in the pump body.

[0010] Furthermore, the pump shaft has a mating end and a connecting end. After the pump shaft passes through the bearings and the second through hole, the connecting end passes through the side of the bearing box away from the pump body. A threaded section protrudes along the axial direction toward the inlet side on the end face of the mating end. A threaded hole is recessed along the axial direction on the end of the shaft handle away from the inlet, in which the threaded section is screwed, so as to realize the connection between the impeller and the pump shaft outside the pump body.

[0011] Furthermore, an extension section coaxially distributed therewith protrudes from the end face of the mating end of the pump shaft in the axial direction toward the inlet side, and the threaded section is extended from the end face of the extension section and coaxially distributed therewith; a limiting cavity section for the extension section to penetrate into is recessed on the end face of the shaft handle away from the inlet, and the threaded hole is recessed from the limiting cavity section on the side close to the inlet to increase the contact area between the pump shaft and the shaft handle and improve the connection stability between the impeller and the pump shaft.

[0012] Furthermore, the diameter of the extension section is smaller than the diameter of the pump shaft to form a step surface between the extension section and the pump shaft. When the threaded section is screwed into the threaded hole, the shaft handle abuts against the step surface, thereby increasing the contact area and improving the firmness and stability between the shaft handle and the pump shaft.

[0013] Furthermore, the positioning portion includes a through screw hole coaxially opened on the shaft handle and the threaded section and screws screwed in the two through screw holes in sequence, thereby limiting the relative rotation between the pump shaft and the shaft handle to avoid rotation looseness.

[0014] Furthermore, the mechanical seal is covered on the threaded hole, and the screw abuts against the inner hole wall of the mechanical seal to prevent the screw from loosening and falling off.

[0015] The chemical pump equipment of the utility model has at least the following beneficial effects: through the cooperation between the pump body, the bearing box, the bearing group, the pump shaft and the impeller, the pump shaft can drive the impeller to rotate in the pump body after being connected to the motor, so that an airflow is formed in the pump body for conveying liquid; by arranging an extended sealing portion extending to the outside of the pump body on the impeller, the pump shaft can be connected to it outside the pump body without contacting the corrosive liquid in the pump body cavity, thereby avoiding corrosion of the pump shaft, thereby effectively improving the service life of the pump shaft; the setting of the positioning portion prevents the pump shaft from rotating in the circumferential direction and effectively avoids rotational looseness between the pump shaft and the impeller, thereby improving the safety of chemical pump equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 This is a structural schematic diagram of the chemical pump equipment of the utility model;

[0018] Figure 2 It is an exploded diagram of the chemical pump equipment of the utility model;

[0019] Figure 3 It is a front sectional view of the chemical pump equipment of the utility model;

[0020] Figure 4 for Figure 3 Magnified view of part A shown.

[0021] The meanings of the symbols in the accompanying drawings are:

[0022] Pump body-1; inlet-11; outlet-12; first mounting port-13; first flange-131; support surface-132; first flange interface-14; second flange interface-15; pump cover-16; first through hole-161; support foot-17; bearing box-2; oil groove-21; second mounting port-22; third flange interface-23; through groove-24; second flange-25; bearing group-3; bearing-31; end cover-32; third flange-321; second through hole-322; pump shaft-4; mating end-41; extension section-411; threaded section-412; step surface-413; connecting end-42; impeller-5; body-51; extended sealing part-52; shaft handle-521; mechanical seal-522; threaded hole-523; limit cavity section-524; positioning part-6; through screw hole-61; screw-62. DETAILED DESCRIPTION

[0023] The utility model will be further described below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 4 As shown, the chemical pump equipment of the utility model includes a pump body 1 with a hollow interior, a bearing box 2 connected to one side of the pump body 1, a bearing group 3 arranged in the bearing box 2, a pump shaft 4 with one end inserted in the bearing group 3, an impeller 5 threadedly connected to the other end of the pump shaft 4, and a positioning portion 6 arranged between the pump shaft 4 and the impeller 5. The bearing box 2 cooperates with the bearing group 3 to support the pump shaft 4 and enable the pump shaft 4 to rotate relative to the bearing box 2 and the pump body 1. The impeller 5 is located in the pump body 1 and is supported and connected by the pump shaft 4. The positioning portion 6 restricts and fixes the pump shaft 4 and the impeller 5 in the circumferential direction so that they can no longer rotate, thereby forming a double limit to avoid the pump shaft 4 and the impeller 5 from falling off and causing adverse effects. The end of the pump shaft 4 away from the impeller 5 is used to be connected to the output shaft of the motor, and the pump shaft 4 is driven to rotate at a high speed when the motor is running. The pump shaft 4 drives the impeller 5 to rotate at a high speed to generate centrifugal force in the sealed pump body 1 to form a vacuum, so that liquid can be extracted and transported.

[0025] In this embodiment, the pump body 1 has an inlet 11, an outlet 12 and a first installation port 13 respectively connected to the inner cavity. The inlet 11 and the first installation port 13 are coaxially distributed on two opposite sides of the pump body 1. The first installation port 13 is located on the side facing the bearing box 2, and the inlet 11 is located on the side facing away from the bearing box 2. A first flange interface 14 is integrally connected to a side surface of the pump body 1 facing away from the bearing box 2. The first flange interface 14 penetrates and connects to the inner cavity of the pump body 1 in the axial direction. The inner cavity of the first flange interface 14 is defined as the inlet 11, and the first flange interface 14 is convenient for connecting with an external inlet pipe. A second flange interface 15 is integrally formed on the outer wall of the pump body 1 along the radial direction of the pump body 1. The second flange interface 15 has an arc-shaped cavity that passes through the second flange interface 15 and connects to the inner cavity of the pump body 1. The inner cavity of the second flange interface 15 is limited to an output port 12. The output port 12 is tangent to the inner cavity of the pump body 1 on one side close to the inner cavity of the pump body 1, so that the centrifugal force generated by the rotation of the impeller 5 can be output from the output port 12, and the second flange interface 15 is convenient for connecting to the external output pipe. The first installation port 13 passes through the side of the pump body 1 facing the bearing box 2 in the axial direction. The first installation port 13 is circular and has a diameter larger than the outer edge diameter of the impeller 5, so as to facilitate the installation of the impeller 5. The first installation port 13 is blocked with a pump cover 16. In order to facilitate the pump cover 16 to block the first installation port 13 and maintain stability, a first flange 131 is convexly provided inwardly in a radial direction around the circumference of the first installation port 13 near the inner cavity of the pump body 1. The inner ring diameter of the first flange 131 is larger than the diameter of the impeller 5 and smaller than the diameter of the first installation port 13, so that a support surface 132 for the pump cover 16 to support is formed between the first flange 131 and the first installation port 13. A sealing ring can be provided between the support surface 132 and the pump cover 16 to ensure the sealing of the inner cavity of the pump body 1. A convex extension is provided on the side surface of the pump cover 16 facing the inlet 11, which can penetrate into the inner ring of the first flange 131. A first through hole 161 is provided at the center of the pump cover 16 along an axial direction for the pump shaft 4 to pass through, and the impeller 5 blocks the first through hole 161 to prevent the liquid in the pump body 1 from leaking. A support foot 17 is provided on the side of the pump body 1 facing away from the outlet 12 , and the support foot 17 facilitates the installation of the pump body 1 on an external device.

[0026] In this embodiment, the bearing box 2 is hollow inside and has an oil groove 21 formed therein, and second mounting ports 22 are formed on two opposite sides of the bearing box 2, which are connected in the axial direction. The two second mounting ports 22 are coaxially distributed and both communicate with the oil groove 21 and the outside of the bearing box 2. The oil groove 21 and the second mounting port 22 are both cylindrical structures and coaxially distributed. The diameter of the oil groove 21 is larger than the diameter of the two second mounting ports 22 so that lubricating oil can be installed in the oil groove 21, so that the lubricating oil can lubricate and cool the bearing group 3, thereby reducing losses and improving service life. In this embodiment, the bearing box 2 is arranged to extend from the outer periphery of the second through hole 322 toward the side of the pump body 1 on the side close to the pump body 1, and the extended part of the bearing box 2 is a wide-mouth structure with a small diameter on the side close to the oil groove 21 and a large diameter on the side close to the pump body 1. A third flange interface 23 is formed on the side of the extended part of the bearing box 2 close to the pump body 1, and the third flange interface 23 passes through the bearing box 2 in the axial direction. The bearing box 2 is fixedly connected to the pump body 1 through the flange plate on the third flange interface 23. The pump cover 16 on the pump body 1 and the extended part of the bearing box 2 together form a cavity, and a plurality of through grooves 24 are opened on the extended part of the bearing box 2 along the radial direction of the bearing box 2, and each through groove 24 connects the cavity to the outside of the pump body 1 and the bearing box 2 so as to be used for cooling the part of the pump shaft 4 inserted therein. In order to improve the connection firmness of the pump cover 16, a second flange 25 in a circular shape is formed on the inner wall of one side of the third flange interface 23 close to the pump body 1 and extends inward in a radial direction around its circumference, and the second flange 25 is convexly extended toward one side of the pump body 1 in the axial direction relative to the third flange interface 23, and the outer diameter of the second flange 25 is smaller than the diameter of the first mounting port 13 and larger than the inner diameter of the first flange 131, the inner diameter of the second flange 25 is smaller than the diameter of the pump cover 16 and larger than the diameter of the first through hole 161, and the second flange 25 is coaxially distributed with the pump cover 16 when the bearing box 2 is connected to the pump body 1, so that the second flange 25 presses the pump cover 16 against the support surface 132 when the pump cover 16 is connected to the pump body 1, so as to further improve the sealing of the pump cover 16.

[0027] In this embodiment, the bearing group 3 includes two bearings 31 and is fixedly connected to the two second installation ports 22 respectively. The outer side walls of the outer rings of the two bearings 31 are connected to the two second installation ports 22 respectively, and the inner diameters of the inner rings of the two bearings 31 are coaxial and have the same diameter. One end of the pump shaft 4 passes through the inner rings of the two bearings 31 in turn and is fixedly connected to the two inner rings. The fixing can be achieved by bonding, welding, etc., so that the pump shaft 4 can rotate freely along its own circumferential direction relative to the bearing box 2. The two second installation ports 22 are blocked with end covers 32 that press against the bearings 31 inwardly. The two end covers 32 are respectively arranged on the opposite sides of the two bearings 31 to block the oil groove 21 and the second installation port 22 to prevent the lubricating oil in the oil groove 21 from leaking in large quantities and increasing the maintenance cost. The bearing box 2 has abutting planes at the end faces opposite to the two second installation ports 22, and the two end covers 32 are respectively pressed against the two abutting planes to ensure the stability between the two end covers 32 and the bearing box 2. In order to further improve the stability between the two end covers 32 and the bearing box 2, circular third flanges 321 are formed on the side surfaces facing each other at the two end covers 32 and extend toward each other in the axial direction. The two third flanges 321 are coaxially distributed with the second mounting port 22, and the outer diameters of the two third flanges 321 are the same as the inner diameter of the second mounting port 22 or the outer diameters of the two third flanges 321 are slightly smaller than the inner diameter of the second mounting port 22, so that the two third flanges 321 can be respectively inserted into the two second mounting ports 22, so as to quickly align the end covers 32 when assembling the bearing box 2 and the end covers 32. The end covers 32 are usually connected to the bearing box 2 by bolts. A coaxial second through hole 322 with the same diameter is opened in the axial direction on both end covers 32. The pump shaft 4 passes through the second through hole 322 and the inner ring of the bearing 31 on the side close to the pump body 1 in turn, and then continues to pass through the inner ring of the bearing 31 and the second through hole 322 on the side away from the pump body 1, until the pump shaft 4 passes through the side of the bearing box 2 away from the pump body 1.

[0028] In this embodiment, the pump shaft 4 is cylindrical and has a mating end 41 and a connecting end 42 at both ends. The diameter of the middle section of the pump shaft 4, that is, the part of the pump shaft 4 between the mating end 41 and the connecting end 42, is larger than the diameter of the mating end 41 and the connecting end 42, so that the connection between the middle section of the pump shaft 4 and the mating end 41 and the connection between the middle section of the pump shaft 4 and the connecting end 42 are both stepped, and the middle section of the pump shaft 4, the mating end 41 and the connecting end 42 are coaxial and integrally connected and distributed. The two bearings 31 are fixedly sleeved on the mating end 41 and the connecting end 42, respectively, and the two shaft seals are respectively against the connection between the ends and the middle section of the pump shaft 4 to increase the contact area with the bearing 31 and improve stability. After the pump shaft 4 passes through each bearing 31 and the second through hole 322, the connecting end 42 passes out of the side of the bearing box 2 away from the pump body 1 to be connected to the output shaft of the motor, so that the operation of the electrode can drive the pump shaft 4 to rotate. An extension section 411 and a threaded section 412 are sequentially protruded from the end surface of the mating end 41 in the axial direction toward the inlet 11. The threaded section 412 is formed by extending from the end surface of the extension section 411 and is coaxially distributed with the extension section 411 and the mating end 41. The diameter of the extension section 411 is smaller than the diameter of the pump shaft 4, and the diameter of the threaded section 412 is smaller than the diameter of the extension section 411, thereby forming a stepped shape, and a step surface 413 is formed between the extension section 411 and the pump shaft 4, thereby increasing the contact area and friction after the pump shaft 4 is connected to the impeller 5, so as to improve the connection stability. An external thread is provided on the outer wall of the threaded section 412, and the external thread is threadedly connected to the impeller 5 to achieve assembly. It should be noted that only the threaded section 412 can be provided on the mating end 41 without the extension section, and the connection between the pump shaft 4 and the impeller 5 can also be achieved.

[0029] In this embodiment, the impeller 5 includes a body 51 and an extended sealing portion 52 extending from the side of the body 51 facing the bearing box 2 along the axial direction toward the side of the pump shaft 4 and passing through the first through hole 161 to pass out of the pump body 1. The body 51 is located in the inner cavity of the pump body 1, and the extended sealing portion 52 is coaxially arranged with the pump body 1. The extended sealing portion 52 is used to block the first through hole 161 of the pump body 1 so that the first through hole 161 of the pump body 1 remains sealed. The threaded section 412 of the pump shaft 4 is screwed on the extended sealing portion 52 to achieve the connection between the impeller 5 and the pump shaft 4. The extended sealing portion 52 blocks the inner cavity of the pump body 1 to prevent leakage and is connected to the pump shaft 4 outside the pump body 1, effectively preventing the pump shaft 4 from being corroded by the corrosive liquid transported in the pump body 1. After the pump shaft 4 is connected to the extended sealing portion 52, the motor is driven to rotate the impeller 5, and the body 51 of the impeller 5 rotates in the pump body 1 to stir the water flow to form centrifugal force to drive the liquid to flow. In the content defined in this embodiment, the extended sealing portion 52 includes a shaft handle 521 extending axially from the side of the impeller 5 facing away from the inlet 11 toward the side of the bearing box 2, and a mechanical seal 522 located in the cavity and sleeved on the shaft handle 521. The mechanical seal 522 and the shaft handle 521 together block the first through hole 161 to prevent leakage. The end of the shaft handle 521 away from the body 51 passes through the inner hole of the mechanical seal 522 and is threadedly connected with the threaded section 412. The shaft handle 521 seals through the first through hole 161 and extends into the cavity, and the mating end 41 of the pump shaft 4 also extends into the cavity. The end of the shaft handle 521 away from the inlet 11 is concavely formed in the axial direction in correspondence with the extension section 411 and the threaded section 412, and a limiting cavity section 524 for the extension section 411 to penetrate therein and a threaded hole 523 for the threaded section 412 to be screwed therein are formed. The threaded hole 523 is concavely formed on the side of the limiting cavity section 524 close to the inlet 11, and an internal thread is provided on the threaded hole 523 to be threadedly connected with the threaded section 412. When the threaded section 412 is screwed in the threaded hole 523, the end surface of the shaft handle 521 away from the body 51 abuts against the step surface 413, thereby increasing the contact area and ensuring all-round limiting between the pump shaft 4 and the impeller 5. The mechanical seal 522 is diametrically sleeved on the shaft handle 521, and one side of the mechanical seal 522 is sealed and penetrates into the first through hole 161 to seal the first through hole 161 with the shaft handle 521, so that the corrosive liquid in the pump body 1 contacts the shaft handle 521 and part of the mechanical seal 522, thereby protecting the pump shaft 4, and the shaft handle 521 can rotate in the circumferential direction relative to the mechanical seal 522. The mechanical seal 522 is a common structure and will not be described in detail here.

[0030] In this embodiment, the positioning portion 6 includes a through screw hole 61 coaxially opened on the shaft handle 521 and the threaded section 412 and a screw 62 screwed in the two through screw holes 61 in sequence. The through screw hole 61 is opened along the radial direction of the threaded section 412. After the threaded section 412 is screwed into the threaded hole 523, the screw 62 locks the threaded section 412 and the threaded hole 523, so that the threaded section 412 cannot rotate relative to the threaded hole 523, thereby avoiding the occurrence of rotational looseness. In order to prevent the screw 62 from loosening or even falling off due to vibration and other factors during the use of the pump shaft 4 and the impeller 5, the mechanical seal 522 is covered on the through-threaded hole 61 of the shaft handle 521, so that the mechanical seal 522 covers the through-threaded hole 61 of the shaft handle 521, and the screw 62 can be just located at the hole of the through-threaded hole 61 on the shaft handle 521 after being screwed in the two through-threaded holes 61, so that the screw 62 can be against the inner hole wall of the mechanical seal 522, so that the mechanical seal 522 can be against the screw 62 to prevent the screw 62 from loosening and falling off. It should be noted that the axial direction mentioned in the present utility model refers to the axial direction of the bearing box 2.

[0031] The working method of one embodiment of the chemical pump equipment of the present invention is as follows: first, the external motor is started to drive the pump shaft 4 to rotate, and the pump shaft 4 drives the main body 51 of the impeller 5 to rotate to form centrifugal force in the inner cavity of the pump body 1 and drive the liquid to be discharged toward the output port 12.

Claims

1. A chemical pump device, comprising a pump body, a bearing box connected to one side of the pump body, a bearing group arranged in the bearing box, a pump shaft with one end passing through the bearing group, and an impeller threadedly connected to the other end of the pump shaft, wherein the impeller is located in the pump body, and is characterized in that: An extension seal portion extending outside the pump body and blocking the pump body is provided on the side of the impeller facing the bearing box. The pump shaft is screwed on the extension seal portion and is restricted from rotating relative to the impeller by a positioning portion.

2. The chemical pump equipment according to claim 1, characterized in that: The pump body is provided with an inlet, an outlet and a first installation port which are respectively connected to the inner cavity. The inlet and the first installation port are relatively distributed on both sides of the pump body and the first installation port is arranged facing the bearing box. The first installation port is blocked with a pump cover. The pump cover is provided with a first through hole which passes through the first through hole in an axial direction. The extended sealing portion seals through the first through hole.

3. The chemical pump equipment according to claim 2, characterized in that: The bearing box has an oil groove therein, and second mounting openings extending in the axial direction are formed on two opposite sides of the bearing box. The bearing group includes two bearings which are fixedly connected in the two second mounting openings respectively. The two second mounting openings are blocked with end covers which press inward against the bearings. Second through holes are formed in the axial direction on the two end covers. The pump shaft passes through the two second through holes and is fixedly connected to the inner rings of the two bearings before passing out of the bearing box.

4. The chemical pump equipment according to claim 2, characterized in that: The bearing box extends from the outer periphery of the second through hole toward the pump body on one side close to the pump body and is fixedly connected to the pump body to enclose a cavity connected to the outside. The extended sealing portion includes a shaft handle extending axially from the side of the impeller facing away from the inlet toward the side of the bearing box. The shaft handle seal passes through the first through hole and extends into the cavity, and the corresponding end of the pump shaft extends into the cavity.

5. The chemical pump equipment according to claim 4, characterized in that: The extended sealing part also includes a mechanical seal located in the cavity and sleeved on the shaft handle. The mechanical seal and the shaft handle together block the first through hole. The end of the shaft handle away from the impeller passes out of the inner hole of the mechanical seal.

6. The chemical pump equipment according to claim 5, characterized in that: The pump shaft has a mating end and a connecting end. After the pump shaft passes through the bearings and the second through hole, the connecting end passes through the side of the bearing box away from the pump body. A threaded section protrudes along the axial direction toward the inlet side on the end surface of the mating end, and a threaded hole is recessed along the axial direction on the end of the shaft handle away from the inlet to form a threaded hole for the threaded section to be screwed into.

7. The chemical pump equipment according to claim 6, characterized in that: An extension section coaxially distributed therewith is protruded from the end face of the mating end of the pump shaft in the axial direction toward the inlet side, and the threaded section is extended from the end face of the extension section and coaxially distributed therewith; a limiting cavity section for the extension section to penetrate is recessed on the end face of the shaft handle away from the inlet, and the threaded hole is recessed from the limiting cavity section close to the inlet.

8. The chemical pump equipment according to claim 7, characterized in that: The diameter of the extension section is smaller than the diameter of the pump shaft so as to form a step surface with the pump shaft, and the shaft handle abuts against the step surface when the threaded section is screwed into the threaded hole.

9. The chemical pump equipment according to claim 8, characterized in that: The positioning part comprises a through screw hole coaxially arranged on the shaft handle and the threaded section and a screw screwed in the two through screw holes in sequence.

10. The chemical pump equipment according to claim 9, characterized in that: The mechanical seal is covered on the threaded hole, and the screw is against the inner hole wall of the mechanical seal.

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