CN111734671A

CN111734671A - Automatic lubricating liquid injection device for oil field centrifugal pump

Info

Publication number: CN111734671A
Application number: CN202010624619.5A
Authority: CN
Inventors: 郑路路; 璩晶磊; 马晓杰; 王蒙蒙; 席夏青; 千红涛; 梁萍; 赵昆
Original assignee: Henan Institute of Technology
Current assignee: CHANGCHUN FIRST PUMP Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2020-10-02
Anticipated expiration: 2040-07-01
Also published as: CN111734671B

Abstract

The invention provides an automatic lubricating liquid injection device of an oil field centrifugal pump, which comprises supporting seats and a protective seat, wherein the two supporting seats are rotatably connected with a driving structure, and an extrusion structure is arranged on the driving structure; an oil gun is arranged on the supporting seat, and a connector structure is arranged on the oil gun; the connector structure comprises a connector main body, a protective seat and a limiting block, wherein the protective seat is sleeved on the connector main body, and the limiting block is arranged on the connector main body; the protective seat is provided with a dismounting groove at the head end and a clamping groove, the protective seat is provided with a clamping groove, the clamping groove is matched with the limiting block, and the clamping groove and the limiting block are both in hexagonal structures; when the clamping groove is clamped with the limiting block, the protective seat and the connector main body are in an axial locking state. The invention solves the problems that when the centrifugal pump is injected, the automatic diffusion of oil in the pump body can be realized only by the pressure of the oil injection pump, and the diffusion effect is poor.

Description

Automatic lubricating liquid injection device for oil field centrifugal pump

Technical Field

The invention belongs to the technical field of centrifugal pump liquid injection devices, and particularly relates to an automatic lubricating liquid injection device of an oil field centrifugal pump.

Background

The lubricant is used for reducing the friction resistance of the friction pair and slowing down the abrasion of the friction pair. The lubricant can also be used for cooling, cleaning and preventing pollution. Suitable additives may be added to certain lubricants in order to improve the lubricating properties. When the lubricant is selected, various factors such as the motion condition, material, surface roughness, working environment and working condition of the friction pair, the performance of the lubricant and the like are generally considered. In mechanical systems, the lubricant is usually supplied to the respective parts to be lubricated by a lubrication system.

As patent CN201521095183.6 discloses an automatic injection device of oil field centrifugal pump lubricated liquid, including the centrifugal pump body, lubricated liquid storage box and lubricated liquid pipe, the top at the base is installed to the centrifugal pump body, the left side of the centrifugal pump body is provided with the entry, the upper left side of the centrifugal pump body is provided with the export, the central point department of putting of axis of rotation installs axis of rotation intercommunication pipe, the top of axis of rotation intercommunication pipe is provided with rotational speed induction system, the top at the centrifugal pump body is installed to lubricated liquid storage box, lubricated liquid pipe fixed mounting is at the inside upside of the centrifugal pump body, and is provided with control flap on the lubricated liquid pipe. This automatic injection device of lubricated liquid of oil field centrifugal pump, structure scientific and reasonable, convenience safe in utilization, emollient is automatic to be added to lubricate, it is more high-efficient when making centrifuge use.

However, the centrifugal pump priming device similar to the above application has the following disadvantages:

one is that when the existing device is used for injecting liquid into the centrifugal pump, the automatic diffusion of oil in the pump body can be realized only by the pressure of the oil injection pump, the diffusion effect is poor, and the synchronous rotation of the rotating shaft of the centrifugal pump can not be realized in a linkage manner during liquid injection so as to realize the uniform diffusion of the oil; moreover, the connector structure of the existing device can not realize protection, the threads on the connector are easy to deform after colliding with foreign objects, and then the unsmooth connection phenomenon is caused, and the protection structure can not assist in realizing the disassembly of the oil filling hole sealing bolt and the threaded connection and fastening of the connector.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide an automatic lubricating liquid injection device of an oil field centrifugal pump, which aims to solve the problems that the automatic diffusion of oil in a pump body can be realized only by the pressure of an oil injection pump when the centrifugal pump is injected by the conventional device, the diffusion effect is poor, and the synchronous rotation of a rotating shaft of the centrifugal pump cannot be realized in a linkage manner during injection so as to realize the uniform diffusion of the oil.

In order to achieve the aim, the invention provides an automatic lubricating liquid injection device of an oil field centrifugal pump, which comprises a supporting seat and a protective seat; the two supporting seats are rotatably connected with a driving structure, and an extrusion structure is arranged on the driving structure; an oil gun is arranged on the supporting seat, and a connector structure is arranged on the oil gun; the connector structure comprises a connector main body, a protective seat and a limiting block, wherein the protective seat is sleeved on the connector main body, and the limiting block is arranged on the connector main body; the protective seat comprises a dismounting groove, a handle is welded on the outer wall of the protective seat, and the dismounting groove is formed in the head end of the protective seat; the dismounting groove is of a hexagonal groove-shaped structure, the size of the dismounting groove is matched with that of the sealing bolt at the oil filling hole, and the protective seat, the dismounting groove and the handle welded on the outer wall of the protective seat form a dismounting wrench structure of the sealing bolt at the oil filling hole together; the protective seat also comprises a clamping groove, the protective seat is provided with the clamping groove, the clamping groove is matched with the limiting block, and the clamping groove and the limiting block are both in a hexagonal structure; when the clamping groove is clamped with the limiting block, the protective seat and the connector main body are in an axial locking state.

In a preferred embodiment, the supporting seat comprises a seat plate, the seat plate is fixedly connected to the supporting seat through bolts, and an oil gun is fixedly connected to the seat plate; the driving structure comprises a rotating shaft, limiting plates and a tooth row, the rotating shaft is rotatably connected to the two supporting seats, the limiting plates are welded to the two supporting seats, and the tooth row is connected to the limiting plates in a sliding mode.

In a preferred embodiment, the drive structure further comprises a driver plate welded to the rack row with a bottom end face thereof contacting a head end of the grease gun and being squeezed as the driver plate moves down following the rack row.

In a preferred embodiment, the driving structure further comprises a ratchet gear, a gear sleeve and a shifting lever, the ratchet gear is welded on the rotating shaft, the gear sleeve is connected to the rotating shaft in a limiting and rotating mode, and the gear sleeve is meshed with the gear row; the gear sleeve is provided with a shifting lever, and the shifting lever is connected with the ratchet gear in an inserting way; the ratchet gear, the gear sleeve and the shifting lever form a ratchet structure together, and the rotating shaft is in a clockwise rotating state when the gear row moves downwards.

In a preferred embodiment, the extrusion structure comprises a rotating seat and a threaded rod, the rotating seat is welded on the tooth row, and the threaded rod is rotatably connected to the rotating seat; the threaded rod and the base plate are in threaded connection, the threaded rod and the base plate jointly form a thread extrusion type structure of the oil gun, and the threaded rod and the base plate further jointly form a clockwise rotation driving type structure of the driving structure.

In a preferred embodiment, the extrusion structure further comprises a limit groove and a stop block, wherein two limit grooves are symmetrically formed in the threaded rod, and the limit grooves are in a rectangular groove-shaped structure; the check block is connected to the threaded rod in a sliding mode, the check block is connected with the locking bolt in a threaded mode, and the check block and the locking bolt on the check block jointly form a vertical limiting structure of the threaded rod.

In a preferred embodiment, the grease gun includes a connecting tube, the connecting tube being connected to the grease gun; the connector main part rotates to be connected at the connecting pipe head end, and connector main part head end offers and is used for the screw thread of being connected with the oil filler point to the welding has the fender ring spacing to the protection seat in the connector main part.

In a preferred embodiment, the protective seat is sleeved on the connector main body, and a limiting block is welded on the connector main body; the outer wall of the connector main body is positioned between the limiting block and the protection seat and is further sleeved with an elastic piece, and the thread at the head end of the connector main body is in a shade state of the protection seat under the pushing of the elastic piece.

Compared with the prior art, the automatic lubricating liquid injection device of the oil field centrifugal pump has the following advantages:

the invention improves the connector structure, can realize the protection of the connecting thread of the connector main body on the connector structure through improvement, prevents unsmooth connection between the connector main body and an oil filling hole due to collision, can realize the disassembly of an oil filling hole sealing bolt through the protective seat on the connector structure, and can form a disassembly and assembly spanner structure of the connector main body through the protective seat on the connector structure, which is concretely as follows: firstly, the outer wall of the connector main body is positioned between the limiting block and the protective seat and is also sleeved with the elastic piece, and the threads at the head end of the connector main body are in a shielding state of the protective seat under the pushing of the elastic piece, so that the protection of the threads at the head end of the connector main body is realized; secondly, the dismounting groove is of a hexagonal groove-shaped structure, the size of the dismounting groove is matched with that of the sealing bolt at the oil filling hole, and the protective seat, the dismounting groove and a handle welded on the outer wall of the protective seat form a dismounting wrench structure of the sealing bolt at the oil filling hole; thirdly, as the protective seat is provided with the clamping groove, the clamping groove is matched with the limiting block, and the clamping groove and the limiting block are both in a hexagonal structure; when the clamping groove is clamped with the limiting block, the protection seat and the connector main body are in an axial locking state, so that the protection seat forms a disassembly and assembly wrench structure of the connector main body at the moment.

The invention improves the oil injection structure, and can realize the rotation of the rotating shaft of the centrifugal pump in linkage while injecting oil through improvement, thereby improving the integrity of oil injection, and the lubricating effect is better, and the invention specifically comprises the following steps: firstly, the poking plate is welded on the gear row, the bottom end face of the poking plate is contacted with the head end of the grease gun, and the grease gun is in a squeezing state when the poking plate moves downwards along with the gear row; secondly, the ratchet gear, the gear sleeve and the deflector rod form a ratchet structure together, and the rotating shaft rotates clockwise when the gear row moves downwards; thirdly, the threaded rod is in threaded connection with the seat plate, the threaded rod and the seat plate jointly form a thread extrusion type structure of the oil gun, and the threaded rod and the seat plate jointly form a clockwise rotation driving type structure of the driving structure; and fourthly, the check block is connected on the threaded rod in a sliding manner, the check block is connected with the locking bolt in a threaded manner, and the locking bolt on the check block jointly form a vertical limiting structure of the threaded rod, so that the vertical limiting structure of the threaded rod can be realized, and the limit of the injection amount of the oil gun is realized.

Drawings

Fig. 1 is a schematic axial view of the lubricating liquid automatic injection device of the oil field centrifugal pump of the invention.

Fig. 2 is an enlarged schematic view of fig. 1 at a.

Fig. 3 is a schematic axial view of the present invention in another direction of fig. 1.

Fig. 4 is an enlarged view of the structure of fig. 3B according to the present invention.

Fig. 5 is an enlarged axial view of the connector structure of the present invention.

Fig. 6 is a schematic axial view of the invention in the other direction of fig. 5.

Fig. 7 is a schematic cross-sectional structure of fig. 5 of the present invention.

Fig. 8 is a schematic axial view of the invention in the other direction from fig. 7.

Description of reference numerals:

1. a supporting seat; 101. a seat plate; 2. a drive structure; 201. a rotating shaft; 202. a limiting plate; 203. a tooth row; 204. a poking plate; 205. a ratchet gear; 206. a gear sleeve; 207. a deflector rod; 3. extruding the structure; 301. a rotating seat; 302. a threaded rod; 30201. a limiting groove; 303. a stopper; 4. an oil gun; 401. a connecting pipe; 5. a connector structure; 501. a connector main body; 502. a baffle ring; 503. a protective seat; 50301. disassembling and assembling the groove; 50302. a clamping groove; 504. a limiting block; 505. an elastic member.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

as shown in figures 1 to 8: the invention provides an automatic lubricating liquid injection device of an oil field centrifugal pump, which comprises a supporting seat 1 and a protective seat 503; the number of the supporting seats 1 is two, the two supporting seats 1 are rotatably connected with a driving structure 2, and an extrusion structure 3 is arranged on the driving structure 2; an oil gun 4 is arranged on the supporting seat 1, and a connector structure 5 is arranged on the oil gun 4. As shown in fig. 5-8, the connecting head structure 5 includes a connecting head main body 501, a protection seat 503 and a limiting block 504, wherein the protection seat 503 is sleeved on the connecting head main body 501, and the limiting block 504 is disposed on the connecting head main body 501. Referring to fig. 6 and 7, the protection seat 503 includes a detachable groove 50301, a handle is welded to the outer wall of the protection seat 503, and the detachable groove 50301 is formed at the head end of the protection seat 503; the dismounting groove 50301 is of a hexagonal groove-shaped structure, the size of the dismounting groove 50301 is matched with that of the sealing bolt at the oil filling hole, and the protective seat 503, the dismounting groove 50301 and a handle welded on the outer wall of the protective seat 503 jointly form a dismounting wrench structure of the sealing bolt at the oil filling hole; the protective seat 503 further comprises a clamping groove 50302, the protective seat 503 is provided with the clamping groove 50302, the clamping groove 50302 is matched with the limiting block 504, and the clamping groove 50302 and the limiting block 504 are both in a hexagonal structure; when the clamping groove 50302 is clamped with the limiting block 504, the protection seat 503 and the connector main body 501 are in an axial locking state, so that the protection seat 503 forms a wrench structure for disassembling and assembling the connector main body 501.

In the above scheme, referring to fig. 3, the support seat 1 includes a seat plate 101, the seat plate 101 is fixedly connected to the support seat 1 through bolts, and the grease gun 4 is fixedly connected to the seat plate 101; drive structure 2 includes pivot 201, limiting plate 202 and tooth row 203, and pivot 201 rotates to be connected on two supporting seats 1, and the welding has limiting plate 202 on two supporting seats 1 to sliding connection has tooth row 203 on limiting plate 202.

Example 2:

referring to fig. 3, the drive structure 2 further includes a driver plate 204, the driver plate 204 is welded to the rack gear 203, and a bottom end face of the driver plate 204 is in contact with a head end of the grease gun 4, and the grease gun 4 is in a pressed state when the driver plate 204 moves down following the rack gear 203.

Referring to fig. 1, fig. 2 and fig. 3, the driving structure 2 further includes a ratchet gear 205, a gear sleeve 206 and a shift lever 207, the ratchet gear 205 is welded on the rotating shaft 201, the gear sleeve 206 is rotatably connected to the rotating shaft 201 in a limiting manner, and the gear sleeve 206 is engaged with the gear row 203; a shifting lever 207 is arranged on the gear sleeve 206, and the shifting lever 207 is connected with the ratchet gear 205 in an inserting way; the ratchet gear 205, the gear sleeve 206 and the shift lever 207 together form a ratchet structure, and the rotating shaft 201 rotates clockwise when the row of teeth 203 moves downward.

Example 3:

referring to fig. 3, the extrusion structure 3 includes a rotary base 301 and a threaded rod 302, the rotary base 301 is welded on the tooth row 203, and the rotary base 301 is rotatably connected with the threaded rod 302; threaded rod 302 and bedplate 101 threaded connection, and threaded rod 302 and bedplate 101 have constituteed the screw extrusion formula structure of grease gun 4 jointly to threaded rod 302 and bedplate 101 have still constituteed the clockwise pivoted drive formula structure of drive structure 2 jointly.

Referring to fig. 3 and 4, the extrusion structure 3 further includes a limiting groove 30201 and a stop block 303, two limiting grooves 30201 are symmetrically formed on the threaded rod 302, and the limiting grooves 30201 are rectangular groove-shaped structures. Dog 303 sliding connection is on threaded rod 302, and threaded connection has a locking bolt on the dog 303 to the perpendicular to limit structure of threaded rod 302 has been constituteed jointly to the locking bolt on dog 303 and the dog 303, thereby can realize that threaded rod 302 is perpendicular to spacing, and then has just also realized the spacing of the oil mass of oiling rifle 4 injection.

Example 4:

referring to FIG. 7, the grease gun 4 includes a coupling pipe 401, and the grease gun 4 is coupled with the coupling pipe 401. The connector main part 501 is rotatably connected at the head end of the connecting pipe 401, the head end of the connector main part 501 is provided with a thread used for being connected with the oil filling hole, and the connector main part 501 is welded with a baffle ring 502 for limiting the protective seat 503.

Referring to fig. 7, the protection seat 503 is sleeved on the connector main body 501, and a limit block 504 is welded on the connector main body 501. The outer wall of the connector main body 501 is located between the limiting block 504 and the protection seat 503 and is further sleeved with an elastic member 505, and the thread at the head end of the connector main body 501 is in a shielding state of the protection seat 503 under the pushing of the elastic member 505, so that the protection of the thread at the head end of the connector main body 501 is realized.

The oil field centrifugal pump lubricating liquid automatic injection device of this embodiment's concrete using-way and effect:

when the oil injection device is used, the rotating shaft 201 and the rotating shaft of the pump body are fixedly connected during oil injection, when the threaded rod 302 on the extrusion structure 3 is rotated, firstly, the poking plate 204 is welded on the tooth row 203, the bottom end face of the poking plate 204 is contacted with the head end of the oil gun 4, and the oil gun 4 is in an extrusion state when the poking plate 204 moves downwards along with the tooth row 203; secondly, the ratchet gear 205, the gear sleeve 206 and the shift lever 207 form a ratchet structure together, and the rotating shaft 201 rotates clockwise when the tooth row 203 moves downwards; thirdly, the threaded rod 302 is in threaded connection with the seat plate 101, the threaded rod 302 and the seat plate 101 jointly form a threaded extrusion type structure of the grease gun 4, and the threaded rod 302 and the seat plate 101 jointly form a clockwise rotation driving type structure of the driving structure 2; fourthly, because of dog 303 sliding connection on threaded rod 302, and threaded connection has a locking bolt on the dog 303 to locking bolt on dog 303 and the dog 303 has constituteed threaded rod 302 perpendicularly to limit structure jointly, thereby can realize that threaded rod 302 perpendicularly is spacing, and then has just also realized the spacing of the oil mass of injecting into of grease gun 4.

When the connector structure 5 is connected with the oil filler point, firstly, the outer wall of the connector main body 501 is positioned between the limiting block 504 and the protection seat 503 and is also sleeved with the elastic member 505, and the threads at the head end of the connector main body 501 are pushed by the elastic force of the elastic member 505 to be in a shielding state of the protection seat 503, so that the protection of the threads at the head end of the connector main body 501 is realized; secondly, the dismounting groove 50301 is of a hexagonal groove-shaped structure, the size of the dismounting groove 50301 is matched with that of the sealing bolt at the oil filling hole, and the protective seat 503, the dismounting groove 50301 and a handle welded on the outer wall of the protective seat 503 jointly form a dismounting wrench structure for the sealing bolt at the oil filling hole; thirdly, as the protective seat 503 is provided with the clamping groove 50302, the clamping groove 50302 is matched with the limiting block 504, and the clamping groove 50302 and the limiting block 504 are both in a hexagonal structure; when the clamping groove 50302 is clamped with the limiting block 504, the protection seat 503 and the connector main body 501 are in an axial locking state, so that the protection seat 503 forms a wrench structure for disassembling and assembling the connector main body 501.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides an automatic injection device of lubricated liquid of oil field centrifugal pump which characterized in that: the automatic lubricating liquid injection device of the oil field centrifugal pump comprises two supporting seats (1), wherein the two supporting seats (1) are rotatably connected with driving structures (2), and extrusion structures (3) are arranged on the driving structures (2); the oil gun is characterized in that the oil gun (4) is installed on the supporting seat (1), the connector structure (5) is installed on the oil gun (4), the connector structure (5) comprises a connector main body (501), a protection seat (503) and a limiting block (504), the protection seat (503) is sleeved on the connector main body (501), and the limiting block (504) is arranged on the connector main body (501); the protective seat (503) comprises a dismounting groove (50301), a handle is welded on the outer wall of the protective seat (503), and the dismounting groove (50301) is formed in the head end of the protective seat (503); the dismounting groove (50301) is of a hexagonal groove-shaped structure, the size of the dismounting groove (50301) is matched with that of the sealing bolt at the oil filling hole, and the protective seat (503), the dismounting groove (50301) and a handle welded on the outer wall of the protective seat (503) jointly form a dismounting wrench structure of the sealing bolt at the oil filling hole; the protective seat (503) further comprises a clamping groove (50302), the protective seat (503) is provided with the clamping groove (50302), the clamping groove (50302) is matched with the limiting block (504), and the clamping groove (50302) and the limiting block (504) are both in a hexagonal structure; when the clamping groove (50302) is clamped with the limiting block (504), the protective seat (503) and the connector main body (501) are in an axial locking state.

2. The automatic lubricating fluid injection device of the oil field centrifugal pump according to claim 1, wherein: the supporting seat (1) comprises a seat plate (101), the seat plate (101) is fixedly connected to the supporting seat (1) through bolts, and the grease gun (4) is fixedly connected to the seat plate (101); drive structure (2) are including pivot (201), limiting plate (202) and tooth row (203), pivot (201) rotate to be connected two on supporting seat (1), and two the welding has limiting plate (202) on supporting seat (1), and sliding connection has tooth row (203) on limiting plate (202).

3. The automatic lubricating fluid injection device of the oil field centrifugal pump according to claim 2, wherein: the driving structure (2) further comprises a poking plate (204), the poking plate (204) is welded on the gear row (203), the bottom end face of the poking plate (204) is in contact with the head end of the grease gun (4), and the grease gun (4) is in an extrusion state when the poking plate (204) moves downwards along with the gear row (203).

4. The automatic lubricating fluid injection device of the oil field centrifugal pump according to claim 1, wherein: the driving structure (2) further comprises a ratchet gear (205), a gear sleeve (206) and a shifting lever (207), the ratchet gear (205) is welded on the rotating shaft (201), the gear sleeve (206) is connected to the rotating shaft (201) in a limiting and rotating mode, and the gear sleeve (206) is meshed with the gear row (203); a shifting lever (207) is installed on the gear sleeve (206), and the shifting lever (207) is connected with the ratchet gear (205) in an inserting manner; the ratchet gear (205), the gear sleeve (206) and the shifting lever (207) jointly form a ratchet structure, and when the gear row (203) moves downwards, the rotating shaft (201) is in a clockwise rotating state.

5. The automatic lubricating fluid injection device of the oil field centrifugal pump according to claim 1, wherein: the extrusion structure (3) comprises a rotating seat (301) and a threaded rod (302), the rotating seat (301) is welded on the tooth row (203), and the rotating seat (301) is rotatably connected with the threaded rod (302); threaded rod (302) and bedplate (101) threaded connection, and threaded rod (302) and bedplate (101) have constituteed the screw extrusion formula structure of grease gun (4) jointly to threaded rod (302) and bedplate (101) have still constituteed the clockwise rotation's of drive structure (2) drive formula structure jointly.

6. The automatic lubricating fluid injection device of the oil field centrifugal pump according to claim 5, wherein: the extrusion structure (3) further comprises a limiting groove (30201) and a stop block (303), two limiting grooves (30201) are symmetrically formed in the threaded rod (302), and the limiting grooves (30201) are of rectangular groove-shaped structures; the stop block (303) is connected to the threaded rod (302) in a sliding mode, a locking bolt is connected to the stop block (303) in a threaded mode, and the stop block (303) and the locking bolt on the stop block (303) jointly form a vertical limiting structure of the threaded rod (302).

7. The automatic lubricating fluid injection device of the oil field centrifugal pump according to claim 1, wherein: the oil gun (4) comprises a connecting pipe (401), and the connecting pipe (401) is connected to the oil gun (4); connector main part (501) rotate to be connected at connecting pipe (401) head end, just the screw thread that is used for being connected with the oil filler point is offered to connector main part (501) head end, and the welding has fender ring (502) spacing to protection seat (503) on connector main part (501).

8. The automatic lubricating fluid injection device of the oil field centrifugal pump according to claim 1, wherein: elastic pieces (505) are further sleeved between the outer wall of the connector main body (501) and the protection seat (503), and the elastic pieces (505) push down the threads at the head end of the connector main body (501) to be in a shielding state of the protection seat (503).