Metering pump of cellulose acetate fiber improved structure

Abstract

The invention relates to the technical field of metering pumps, and particularly discloses a metering pump of an acetate fiber improved structure, which comprises a pump body, a driving shaft, a driven shaft and a transmission mechanism, a cavity is formed in the pump body; the driving shaft is inserted into the pump body; a driving gear is mounted on the outer side wall of the driving shaft; the driven shaft is installed in the pump body, and a driven gear is installed on the outer side wall of the end of the driven shaft. A liquid inlet channel and a liquid outlet channel which are communicated with the cavity are arranged in the pump body; a sealing sleeve is mounted on the side wall of the pump body; a first sealing ring and a second sealing ring are arranged in the sealing sleeve; one end face of the first sealing ring is a convex conical surface; one end face of the second sealing ring is an inner concave conical surface matched with the outer convex conical surface; a transmission mechanism is arranged outside the sealing sleeve; the end faces, close to each other, of the first sealing ring and the second sealing ring are arranged to be the outer convex conical face and the inner concave conical face which can be matched, so that the sealing effect of the first sealing ring and the second sealing ring is improved, and the possibility of liquid leakage is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of metering pumps, in particular to a metering pump with improved structure of acetate fibers. BACKGROUND

[0002] Acetate fibers are the most potential energy-saving and environment-friendly thermal insulation materials in the world today, which have the advantages of smooth hand feeling, comfortable wearing, moisture absorption and air permeability, light texture, low moisture regain, anti-pilling and anti-static. As a key component of the entire acetate fiber production line, the metering pump plays a decisive role in the quality of acetate fiber formation. Therefore, improving the quality of the metering pump and its components is of great significance for optimizing the performance of acetate fibers.

[0003] In the prior art, a sealing ring with a flat end surface is commonly used to seal the driving shaft of the metering pump. Such a sealing ring is prone to unfirm sealing during long-term use of the metering pump, thereby causing leakage of the metering pump and affecting the operation of the metering pump. SUMMARY

[0004] The application provides a metering pump with improved structure of acetate fibers, which has improved sealing effect and reduces the possibility of liquid leakage.

[0005] The application provides a metering pump with improved structure of acetate fibers, which adopts the following technical scheme: A metering pump with improved structure of acetate fibers comprises a pump body, a driving shaft, a driven shaft and a transmission mechanism. A cavity is arranged in the pump body. The driving shaft is inserted into the pump body, one end of the driving shaft is located in the cavity, and the other end of the driving shaft extends to the outside of the pump body. The driving shaft is rotationally connected with the pump body, and a driving gear is coaxially arranged on the outer wall of the end of the driving shaft located in the cavity. The driven shaft is arranged in the pump body, and one end of the driven shaft is coaxially rotationally connected with a driven gear located in the cavity and meshing with the driving gear. The pump body is provided with a liquid inlet channel connecting the cavity and a liquid inlet pipe outside, and is provided with a liquid outlet channel connecting the cavity and a liquid outlet pipe outside. A sealing sleeve is detachably arranged on the outer wall of the pump body. The sealing sleeve is arranged on the end of the driving shaft extending to the outside of the pump body, and the inner wall of the sealing sleeve is provided with a first sealing ring and a second sealing ring arranged on the outer wall of the driving shaft. The end face of the first sealing ring close to the second sealing ring is an outwardly convex conical surface. The end face of the second sealing ring close to the first sealing ring is an inwardly concave conical surface matched with the outwardly convex conical surface. The outer part of the sealing sleeve is provided with a transmission mechanism for rotating the driving shaft by an external driving unit.

[0006] By adopting the technical scheme, the external liquid inlet pipeline is communicated with the liquid inlet channel, and the external liquid outlet channel is communicated with the liquid outlet channel. When the external driving unit drives the driving shaft and the driving gear to rotate through the transmission mechanism, the driving gear drives the driven gear to rotate in the cavity under the meshing cooperation of the driving gear and the driven gear, so that the liquid enters the cavity through the liquid inlet pipeline and is discharged through the liquid outlet pipeline, thereby realizing the conveying of the liquid. When the liquid in the cavity leaks through the gap between the driving shaft and the pump body contact part, the leaked liquid enters the sealing sleeve to extrude the first sealing ring and the second sealing ring. Since the end faces of the first sealing ring and the second sealing ring that are close to each other are cooperating convex and concave conical surfaces, when the first sealing ring and the second sealing ring are extruded and deformed, the outer circumferential surface of the first sealing ring and the second sealing ring abuts against the inner circumferential surface of the sealing sleeve, and the inner circumferential surface of the first sealing ring and the second sealing ring abuts against the outer circumferential surface of the driving shaft, so that the gap between the first sealing ring and the second sealing ring and the inner wall of the sealing sleeve and the gap between the outer circumferential surface of the driving shaft have good sealing effect, thereby reducing the possibility of liquid leakage to the external environment.

[0007] Preferably, the transmission mechanism comprises a rotating seat, a gear ring and a connecting assembly; the rotating seat is rotatably installed on the outer circumferential surface of the sealing sleeve through a bearing; the gear ring is coaxially fixed on the outer circumferential surface of the rotating seat; and the connecting assembly is arranged on the rotating seat and can drive the rotating seat to rotate with the driving shaft.

[0008] By adopting the technical scheme, when the external driving unit drives the gear ring to rotate in a meshing cooperation manner, the gear ring drives the rotating seat to rotate, and under the cooperation of the connecting assembly, the rotating seat drives the driving shaft to rotate, so that the external driving unit drives the driving shaft to rotate.

[0009] Preferably, the connecting assembly comprises a connecting shaft and a clamping plate; the connecting shaft is coaxially inserted into the end of the driving shaft extending into the sealing sleeve, and the connecting shaft is relatively stationary with the driving shaft; the clamping plate is detachably installed on the end face of the rotating seat through a fixing bolt, and a rectangular opening corresponding to the position of the connecting shaft is formed in the clamping plate; and a protrusion penetrating through the rectangular opening is arranged on the end face of the connecting shaft away from the driving shaft, and the connecting shaft is relatively stationary with the clamping plate.

[0010] By adopting the technical scheme, after the connecting shaft is inserted into the driving shaft, the clamping opening of the clamping plate is aligned with the position of the protrusion, and the clamping plate is arranged on the end of the connecting shaft away from the driving shaft, and the clamping plate is fixed on the rotating seat through the fixing bolt, so as to realize the connection between the rotating seat and the driving shaft, and make the rotating seat and the driving shaft relatively stationary, so that the rotating seat drives the driving shaft to rotate synchronously during the rotation process.

[0011] Preferably, the pump body comprises a first cover plate, an intermediate plate and a second cover plate; the intermediate plate is arranged on the side wall of the first cover plate; the second cover plate is arranged on the side wall of the intermediate plate away from the first cover plate; a long bolt is arranged on the first cover plate; the long bolt is screwed on the second cover plate through the first cover plate and the intermediate plate; the cavity is formed by the inner wall of the intermediate plate and the two side walls of the first cover plate and the second cover plate; the driving shaft is rotatably arranged on the second cover plate; the driven shaft is rotatably arranged on the first cover plate; the liquid inlet channel is arranged in the second cover plate; and the liquid outlet channel is arranged in the first cover plate.

[0012] By adopting the above technical scheme, when the pump body is installed, the intermediate plate is placed between the first cover plate and the second cover plate, and the first cover plate, the intermediate plate and the second cover plate are connected by the long bolt, so as to facilitate the first cover plate side wall, the intermediate plate inner wall and the second cover plate side wall to cooperate to form the cavity. By arranging the pump body in the form of the first cover plate, the intermediate plate and the second cover plate, the cavity, the liquid inlet channel and the liquid outlet channel are conveniently formed.

[0013] Preferably, the end of the driving shaft provided with the driving gear is inserted into the first cover plate and the intermediate plate through the second cover plate; the first steel wire baffle and the second steel wire baffle are arranged on the outer circumferential surface of the driving shaft and located on the two sides of the driving gear respectively; the outer wall of the first steel wire baffle is arranged on the inner wall of the first cover plate; and the outer wall of the second steel wire baffle is arranged on the inner wall of the second cover plate.

[0014] By adopting the above technical scheme, the first steel wire baffle and the second steel wire baffle arranged on the driving shaft reduce the possibility of axial movement of the driving shaft and improve the stability of the driving shaft installation.

[0015] Preferably, one end of the liquid inlet channel is arranged on the side wall of the second cover plate, and the other end is communicated with the cavity; the liquid inlet is arranged on the side wall of the second cover plate away from the first cover plate and communicated with the liquid inlet channel; and the first leak stop bolt is screwed on the inner side wall of the opening of the liquid inlet channel on the side wall of the second cover plate.

[0016] By adopting the above technical scheme, one end of the liquid inlet channel is arranged on the side wall of the second cover plate, which facilitates the processing of the liquid inlet channel; the liquid inlet is arranged to connect with the external liquid pipeline, so that the external liquid enters the cavity through the liquid inlet channel; and the first leak stop bolt is arranged to block the opening of the liquid inlet channel on the side wall of the second cover plate, thereby reducing the possibility of liquid leakage.

[0017] Preferably, the liquid outlet channel has an opening at one end on the side wall of the first cover plate and an opening at the other end communicating with the cavity; the first cover plate has a liquid outlet opening communicating with the liquid outlet channel on the side wall away from the second cover plate; and the opening of the liquid outlet channel on the side wall of the first cover plate is threadedly connected with a second leak-stopping bolt.

[0018] By adopting the above technical scheme, the opening of the liquid outlet channel at one end is arranged on the side wall of the first cover plate, which facilitates the processing of the liquid outlet channel; the liquid outlet opening is arranged to connect with the external liquid outlet pipeline, so that the liquid in the cavity is discharged through the liquid outlet channel, and the second leak-stopping bolt is arranged to block the opening of the liquid outlet channel on the side wall of the first cover plate, thereby reducing the possibility of liquid leakage.

[0019] Preferably, a stepped column and a positioning pin are arranged between the first cover plate and the second cover plate; the stepped column is inserted into the first cover plate and the second cover plate at both ends, respectively; the first cover plate is provided with a first positioning hole corresponding to the position of the positioning pin; the second cover plate is provided with a second positioning hole corresponding to the position of the positioning pin; and the positioning pin is inserted into the first positioning hole and the second positioning hole at both ends, respectively.

[0020] By adopting the above technical scheme, when the pump body is assembled, the first cover plate and the second cover plate are inserted into the stepped column at both ends, respectively, and the positioning pin is inserted into the first positioning hole and the second positioning hole, so as to position the first cover plate and the second cover plate, thereby avoiding the deflection of the first cover plate and the second cover plate when the intermediate plate is installed, and the long bolt is used to fixedly connect the first cover plate, the intermediate plate and the second cover plate.

[0021] Preferably, the driving shaft is provided with a pin key on the outer wall in the intermediate plate; and the driving gear is coaxially and detachably installed on the outer side wall of the driving shaft through the pin key.

[0022] By adopting the above technical scheme, when the driving gear is installed, the pin key is installed on the outer side wall of the driving shaft, and the driving gear is sleeved on the pin key and the outer part of the driving shaft, and the shaft pin is arranged to keep the driving gear and the driving shaft in a relatively static state, so as to make the driving shaft and the driving gear rotate synchronously, and the overall installation structure is simple and convenient to disassemble.

[0023] Preferably, the bearing is provided with a first limiting check ring on the outer circumferential surface of the sealing sleeve and a second limiting check ring on the inner circumferential surface of the rotating seat at both sides.

[0024] By adopting the above technical scheme, the first limiting check ring is arranged to limit the axial movement of the bearing, and the second limiting check ring is arranged to limit the axial movement of the rotating seat, thereby improving the stability of the installation of the bearing and the rotating seat.

[0025] In summary, the present application has the following beneficial effects: 1. When the liquid in the cavity leaks into the sealing sleeve, the liquid will extrude the first sealing ring and the second sealing ring, and due to the matching convex and concave surfaces of the end faces of the first sealing ring and the second sealing ring, when subjected to pressure, the outer circumferential surface of the first sealing ring and the second sealing ring will be tightly attached to the inner circumferential surface of the sealing sleeve, and the inner circumferential surface of the first sealing ring and the second sealing ring will be tightly attached to the outer circumferential surface of the driving shaft, so as to have a good sealing effect at the gap between the first sealing ring and the second sealing ring and the inner wall of the sealing sleeve and the gap of the outer circumferential surface of the driving shaft, thereby reducing the possibility of liquid leakage to the external environment; 2. The transmission driven by the external driving unit is realized by the transmission mechanism, and when the external driving unit drives the gear ring to rotate in a meshing manner, the gear ring drives the rotating seat to rotate, and under the cooperation of the connecting assembly, the rotating seat drives the driving shaft to rotate, so as to conveniently realize the rotation of the driving shaft driven by the external driving unit. 3. The first steel wire retainer and the second steel wire retainer arranged on the driving shaft are used to block and limit the installed driving shaft, thereby reducing the possibility of axial movement of the driving shaft and improving the stability of the installation of the driving shaft. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a metering pump with improved structure of acetate fiber; Figure 2 It is a sectional structure schematic diagram of the pump body in the application; Figure 3 It is a sectional structure schematic diagram of the second cover plate in the application; Figure 4 It is a sectional structure schematic diagram of the first cover plate in the application; Figure 5 It is a cooperation structure schematic diagram of the second cover plate, the sealing sleeve and the driving shaft in the application; Figure 6 It is a cooperation structure schematic diagram of the driving shaft, the first steel wire retainer and the second steel wire retainer in the application; Figure 7 It is a cooperation structure schematic diagram of the driving shaft, the sealing sleeve and the transmission mechanism in the application; Figure 8 It is a cooperation structure schematic diagram of the rotating seat, the connecting assembly and the driving shaft in the application.

[0027] Fig. 1 is a pump body; 11 is a cavity; 12 is a liquid inlet channel; 121 is a liquid inlet; 122 is a first leak stop bolt; 13 is a liquid outlet channel; 131 is a liquid outlet; 132 is a second leak stop bolt; 14 is a first cover plate; 15 is an intermediate plate; 16 is a second cover plate; 17 is a long bolt; 18 is a stepped column; 19 is a positioning pin; 2 is a driving shaft; 21 is a driving gear; 22 is a first steel wire retainer ring; 23 is a second steel wire retainer ring; 24 is a pin key; 3 is a driven shaft; 31 is a driven gear; 4 is a transmission mechanism; 41 is a rotating seat; 42 is a gear ring; 43 is a connecting assembly; 431 is a connecting shaft; 432 is a clamping plate; 433 is a fixing bolt; 434 is a rectangular opening; 435 is a protrusion; 44 is a bearing; 441 is a first limiting retainer ring; 442 is a second limiting retainer ring; 5 is a sealing sleeve; 51 is a first sealing ring; 52 is a second sealing ring. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the drawings. Identical parts are denoted by identical reference numerals. It should be noted that the terms "front", "back", "left", "right", "upper", "lower", "bottom surface" and "top surface" in the following description refer to the directions in the drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0029] The application discloses a metering pump with improved structure of acetate fiber, as shown in Figure 1 and Figure 2 Fig. 1 is a pump body; 11 is a cavity; 12 is a liquid inlet channel; 121 is a liquid inlet; 122 is a first leak stop bolt; 13 is a liquid outlet channel; 131 is a liquid outlet; 132 is a second leak stop bolt; 14 is a first cover plate; 15 is an intermediate plate; 16 is a second cover plate; 17 is a long bolt; 18 is a stepped column; 19 is a positioning pin; 2 is a driving shaft; 21 is a driving gear; 22 is a first steel wire retainer ring; 23 is a second steel wire retainer ring; 24 is a pin key; 3 is a driven shaft; 31 is a driven gear; 4 is a transmission mechanism; 41 is a rotating seat; 42 is a gear ring; 43 is a connecting assembly; 431 is a connecting shaft; 432 is a clamping plate; 433 is a fixing bolt; 434 is a rectangular opening; 435 is a protrusion; 44 is a bearing; 441 is a first limiting retainer ring; 442 is a second limiting retainer ring; 5 is a sealing sleeve; 51 is a first sealing ring; 52 is a second sealing ring.

[0030] The first cover plate 14, the intermediate plate 15 and the second cover plate 16 are assembled and fixedly connected by long bolts 17, so as to cooperate to form the pump body 1. When the external driving unit drives the driving shaft 2 and the driving gear 21 to rotate, the driving gear 21 drives the driven gear 31 to rotate under the meshing cooperation of the driving gear 21 and the driven gear 31, so that the liquid enters the cavity 11 through the liquid inlet channel 12 and is discharged through the liquid outlet channel 13 to realize the delivery of the liquid.

[0031] As shown in Figure 1 and Figure 2 , the first cover plate 14 and the second cover plate 16 are horizontally provided with a stepped column 18 and a positioning pin 19 outside the intermediate plate 15. The stepped column 18 penetrates the first cover plate 14 and the second cover plate 16 at both ends, respectively. The stepped column 18 is provided with a first positioning hole corresponding to the position of the positioning pin 19 on the first cover plate 14, and a second positioning hole corresponding to the position of the positioning pin 19 on the second cover plate 16. One end of the positioning pin 19 is inserted into the first positioning hole and in contact with the inner wall of the first positioning hole, and the other end of the positioning pin 19 is inserted into the second positioning hole and in contact with the inner wall of the second positioning hole. The stepped column 18 and the positioning pin 19 are used for connection and positioning during assembly of the pump body 1, facilitating the assembly of the pump body 1 as a whole.

[0032] As shown in Figure 2 and Figure 3 , one end of the liquid inlet channel 12 is opened on the side wall of the second cover plate 16, and the other end is opened on the gear disengagement side inside the cavity 11. The second cover plate 16 is provided with a liquid inlet 121 on the end face away from the first cover plate 14, which is in communication with the liquid inlet channel 12. The inner side wall of the opening of the liquid inlet channel 12 on the side wall of the second cover plate 16 is threadedly connected with a first leak stop bolt 122, and the first leak stop bolt 122 is sleeved with a first sealing ring.

[0033] The opening of one end of the liquid inlet channel 12 is arranged on the side wall of the second cover plate 16, which facilitates the machining of the liquid inlet channel 12. The liquid inlet 121 is arranged to realize connection with the external liquid inlet pipeline, so that the external solution enters the cavity 11 through the liquid inlet channel 12. The first leak stop bolt 122 is arranged to plug the opening of the liquid inlet channel 12 on the side wall of the second cover plate 16, preventing solution leakage.

[0034] As shown in Figure 2 and Figure 4 , one end of the liquid outlet channel 13 is opened on the side wall of the first cover plate 14, and the other end is opened on the gear meshing side inside the cavity 11. The first cover plate 14 is provided with a liquid outlet 131 on the side wall away from the second cover plate 16, which is in communication with the liquid outlet channel 13. The inner side wall of the opening of the liquid outlet channel 13 on the side wall of the first cover plate 14 is threadedly connected with a second leak stop bolt 132, and the second leak stop bolt 132 is sleeved with a second sealing ring.

[0035] The opening of one end of the liquid outlet channel 13 is arranged above the side wall of the first cover plate 14, which facilitates the processing of the liquid outlet channel 13. The liquid outlet 131 is arranged to be connected with the external liquid outlet pipeline, so that the solution inside the cavity 11 is discharged through the liquid outlet channel 13. The second leak stop bolt 132 is arranged to plug the opening of the liquid outlet channel 13 on the side wall of the first cover plate 14, preventing solution leakage.

[0036] As shown in Figure 2 , Figure 5 and Figure 6 , the second cover plate 16 is detachably mounted with a sealing sleeve 5 away from the side wall of the first cover plate 14 through a set of fastening bolts. The sealing sleeve 5 is coaxially arranged outside the driving shaft 2. The inner side wall of the sealing sleeve 5 is provided with a first sealing ring 51 and a second sealing ring 52, which are sleeved on the outer side wall of the end of the driving shaft 2 extending out of the second cover plate 16. The end face of the first sealing ring 51 close to the first sealing ring 51 is an outward convex conical surface. The end face of the second sealing ring 52 close to the first sealing ring 51 is an inward concave conical surface in contact with the outward convex conical gear. The outer peripheral surface of the driving shaft 2 close to the first cover plate 14 is provided with a first groove. The first groove is installed with a first steel wire baffle 22, which is blocked on the inner wall of the first cover plate 14. The outer peripheral surface of the driving shaft 2 close to the second cover plate 16 is provided with a second groove. The second groove is installed with a second steel wire baffle 23, which is blocked on the inner wall of the second cover plate 16.

[0037] The first steel wire baffle 22 and the second steel wire baffle 23 are arranged to limit the installation of the driving shaft 2, reduce the possibility of axial movement of the driving shaft 2, and improve the stability of the driving shaft 2. When the liquid in the cavity 11 leaks into the sealing sleeve 5 through the gap between the contact part of the driving shaft 2 and the second cover plate 16, the liquid will be extruded to the first sealing ring 51 and the second sealing ring 52. Under the cooperation of the outward convex conical surface and the inward concave conical surface, when the first sealing ring 51 and the second sealing ring 52 are extruded and deformed, the outer peripheral surface of the first sealing ring 51 and the second sealing ring 52 will be tightly pressed against the inner peripheral surface of the sealing sleeve 5, and the inner peripheral surface of the first sealing ring 51 and the second sealing ring 52 will be tightly pressed against the outer peripheral surface of the driving shaft 2, so as to promote the gap to have a good sealing effect and reduce the possibility of liquid leakage to the external environment.

[0038] As shown in Figure 1 and Figure 7As shown, the sealing sleeve 5 is stepped, and the sealing sleeve 5 is provided with a transmission mechanism 4 on the small-diameter outer peripheral surface, which can drive the driving shaft 2 to rotate by the external driving unit, the transmission mechanism 4 comprises a rotating seat 41, a gear ring 42 and a connecting assembly 43, the rotating seat 41 is installed on the outer peripheral surface of the sealing sleeve 5 through a pair of bearings 44, the gear ring 42 is coaxially fixed on the outer peripheral surface of the rotating seat 41, the connecting assembly 43 is arranged on the rotating seat 41, and the connecting assembly 43 connects the rotating seat 41 and the driving shaft 2 to promote the rotating seat 41 to drive the driving shaft 2 to rotate synchronously, and the sealing sleeve 5 is provided with a first limiting baffle 441 arranged on one side of the bearing 44 on the outer peripheral surface, and the rotating seat 41 is provided with a second limiting baffle 442 arranged on the side away from the first limiting baffle 441 on the inner peripheral surface.

[0039] When the external driving unit drives the gear ring 42 to rotate through the meshing cooperation, the gear ring 42 drives the rotating seat 41 to rotate, and the connecting assembly 43 promotes the rotating seat 41 to drive the driving shaft 2 to rotate, so as to realize that the external driving unit drives the driving shaft 2 to rotate, and the first limiting baffle 441 and the second limiting baffle 442 are arranged to limit the bearings 44 and the rotating seat 41, reduce the possibility of axial movement of the bearings 44 and the rotating seat 41, and improve the stability of the bearings 44 and the rotating seat 41.

[0040] As shown in Figure 7 and Figure 8 , the connecting assembly 43 comprises a connecting shaft 431 and a clamping plate 432, the driving shaft 2 extends to the clamping block-shaped end outside the second cover plate 16, the connecting shaft 431 is coaxially and horizontally inserted into the clamping block-shaped end of the driving shaft 2, the end of the connecting shaft 431 close to the driving shaft 2 is clamping groove-shaped matched with the clamping block-shaped end, the end of the connecting shaft 431 away from the driving shaft 2 extends to the outside of the sealing sleeve 5 and is provided with a protrusion 435, the clamping plate 432 is detachably installed on the end face of the rotating seat 41 away from the second cover plate 16 through a pair of fixing bolts 433, the clamping plate 432 is provided with a rectangular port 434 corresponding to the position of the connecting shaft 431, which can be passed through by the protrusion 435, and the protrusion 435 and the inner wall of the rectangular port 434 are in sliding cooperation, and the clamping plate 432 and the connecting shaft 431 are kept relatively stationary through the cooperation of the protrusion 435 and the inner wall of the rectangular port 434.

[0041] During the rotation of the rotating seat 41, the rotating seat 41 drives the connecting shaft 431 to rotate through the cooperation of the clamping plate 432 and the protrusion 435, and under the action of the clamping connection structure formed by the clamping block-shaped end of the driving shaft 2 and the clamping groove-shaped end of the connecting shaft 431, the connecting shaft 431 drives the driving shaft 2 to rotate synchronously during the rotation, so that the rotating seat 41 drives the driving shaft 2 to rotate synchronously.

[0042] As shown in Figure 2 and Figure 6As shown, the driving shaft 2 is provided with a key groove on the outer side wall in the middle plate 15; a pin key 24 is installed in the key groove, and the driving gear 21 is sleeved outside the driving shaft 2 and the pin key 24, and the driving shaft 2 drives the driving gear 21 to rotate synchronously through the pin key 24.

[0043] The pin key 24 is provided to conveniently realize the installation and dismounting of the driving gear 21 on the driving shaft 2, and the installation process is simple and convenient, facilitating dismounting and maintenance.

[0044] Working principle: when the liquid is transported, the external driving unit drives the gear ring 42 and the rotating seat 41 to rotate through meshing transmission, the rotating seat 41 drives the connecting shaft 431 and the driving shaft 2 to rotate synchronously through the clamping plate 432 in the rotating process, so as to drive the driving shaft 2 to rotate in the cavity 11, and the driving gear 21 drives the driven gear 31 to rotate under the meshing cooperation of the driving gear 21 and the driven gear 31, so that the space volume of the gear disengagement side changes from small to large to form a vacuum, so that the external liquid is sucked into the cavity 11 through the liquid inlet channel 12, and the space volume of the gear meshing side changes from large to small, so that the liquid in the cavity 11 is discharged through the liquid outlet channel 13, thereby realizing the transportation of the liquid. When the liquid is transported through the cavity 11, the leaked liquid will enter the sealing sleeve 5 to extrude the first sealing ring 51 and the second sealing ring 52 when the liquid in the cavity 11 leaks through the gap between the contact part of the driving shaft 2 and the second cover plate 16, and the end faces of the first sealing ring 51 and the second sealing ring 52 that are close to each other are matched with the outer convex conical surface and the inner concave conical surface, so that when the first sealing ring 51 and the second sealing ring 52 are extruded and deformed, the outer circumferential surface of the first sealing ring 51 and the second sealing ring 52 is tightly contacted with the inner circumferential surface of the sealing sleeve 5, and the inner circumferential surface of the first sealing ring 51 and the second sealing ring 52 is tightly contacted with the outer circumferential surface of the driving shaft 2, so that the gap between the first sealing ring 51 and the second sealing ring 52 and the inner wall of the sealing sleeve 5 and the gap between the outer circumferential surface of the driving shaft 2 have good sealing effect, reducing the possibility of liquid leakage to the external environment.

[0045] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, so that: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A metering pump with an improved cellulose acetate structure, characterized in that: The pump body (1) includes a pump body (1), a drive shaft (2), a driven shaft (3), and a transmission mechanism (4). A cavity (11) is provided inside the pump body (1). The drive shaft (2) is inserted inside the pump body (1), with one end located inside the cavity (11) and the other end extending outside the pump body (1). The drive shaft (2) rotates with the pump body (1). A drive gear (21) is coaxially mounted on the outer wall of the end of the drive shaft (2) located inside the cavity (11). The driven shaft (3) is installed inside the pump body (1), with one end coaxially rotatably connected to a driven gear (31) located inside the cavity (11) and meshing with the drive gear (21). The pump body (1) has an inlet channel (12) that connects the cavity (11) to an external inlet pipe. The pump body (1) is provided with a liquid outlet channel (13) that can connect the cavity (11) and the external liquid outlet pipe; a sealing sleeve (5) is detachably installed on the outer wall of the pump body (1); the sealing sleeve (5) is located outside the end of the drive shaft (2) that extends outside the pump body (1); a first sealing ring (51) and a second sealing ring (52) are provided on the inner wall of the sealing sleeve (5) and are fitted on the outer wall of the drive shaft (2); the end face of the first sealing ring (51) near the second sealing ring (52) is an outwardly convex conical surface; the end face of the second sealing ring (52) near the first sealing ring (51) is an inwardly concave conical surface that cooperates with the outwardly convex conical surface; a transmission mechanism (4) is provided outside the sealing sleeve (5) that can drive the drive shaft (2) to rotate by an external drive unit.

2. The metering pump with an improved cellulose acetate structure according to claim 1, characterized in that: The transmission mechanism (4) includes a rotating seat (41), a gear ring (42), and a connecting assembly (43); the rotating seat (41) is rotatably mounted on the outer circumferential surface of the sealing sleeve (5) via a bearing (44); the gear ring (42) is coaxially fixed on the outer circumferential surface of the rotating seat (41); the connecting assembly (43) is disposed on the rotating seat (41), and the connecting assembly (43) enables the rotating seat (41) to drive the drive shaft (2) to rotate.

3. The metering pump with an improved cellulose acetate structure according to claim 2, characterized in that: The connecting assembly (43) includes a connecting shaft (431) and a clamping plate (432); the connecting shaft (431) is coaxially inserted into the end of the drive shaft (2) that extends into the sealing sleeve (5), and the connecting shaft (431) is relatively stationary with respect to the drive shaft (2); the clamping plate (432) is detachably mounted on the end face of the rotating seat (41) by fixing bolts (433), and a rectangular opening (434) is provided on the clamping plate (432) at the position corresponding to the connecting shaft (431); a protrusion (435) passing through the rectangular opening (434) is provided on the end face of the connecting shaft (431) away from the drive shaft (2), and the connecting shaft (431) is relatively stationary with respect to the clamping plate (432).

4. The metering pump with an improved cellulose acetate structure according to claim 1, characterized in that: The pump body (1) includes a first cover plate (14), an intermediate plate (15), and a second cover plate (16); the intermediate plate (15) covers the side wall of the first cover plate (14); the second cover plate (16) covers the side wall of the intermediate plate (15) away from the first cover plate (14); a long bolt (17) is provided on the first cover plate (14); the long bolt (17) passes through the first cover plate (14) and the intermediate plate (15) and is threadedly connected to the second cover plate (16); the cavity (11) is formed by the cooperation of the inner wall of the intermediate plate (15) and the two side walls of the first cover plate (14) and the second cover plate (16) that are close to each other; the drive shaft (2) is rotatably disposed on the second cover plate (16); the driven shaft (3) is rotatably disposed on the first cover plate (14); the liquid inlet channel (12) is located inside the second cover plate (16); the liquid outlet channel (13) is located inside the first cover plate (14).

5. The metering pump with an improved cellulose acetate structure according to claim 4, characterized in that: The end of the drive shaft (2) on which the drive gear (21) is mounted passes through the second cover plate (16) and is inserted into the first cover plate (14) and the intermediate plate (15); the outer circumferential surface of the drive shaft (2) is provided with a first wire retaining ring (22) and a second wire retaining ring (23) located on both sides of the drive gear (21); the outer wall of the first wire retaining ring (22) is blocked on the inner wall of the first cover plate (14); the outer wall of the second wire retaining ring (23) is blocked on the inner wall of the second cover plate (16).

6. The metering pump with an improved cellulose acetate structure according to claim 4, characterized in that: One end of the liquid inlet channel (12) is located on the side wall of the second cover plate (16), and the other end is connected to the cavity (11); the side wall of the second cover plate (16) away from the first cover plate (14) is provided with a liquid inlet (121) that is connected to the liquid inlet channel (12); a first leak-stopping bolt (122) is threadedly connected to the inner side wall of the opening of the liquid inlet channel (12) on the side wall of the second cover plate (16).

7. The metering pump with an improved cellulose acetate structure according to claim 4, characterized in that: One end of the liquid outlet channel (13) is located on the side wall of the first cover plate (14), and the other end is connected to the cavity (11); the side wall of the first cover plate (14) away from the second cover plate (16) is provided with a liquid outlet (131) that is connected to the liquid outlet channel (13); a second plugging bolt (132) is threadedly connected to the inner side wall of the opening of the liquid outlet channel (13) on the side wall of the first cover plate (14).

8. The metering pump with an improved cellulose acetate structure according to claim 4, characterized in that: A stepped post (18) and a positioning pin (19) are provided between the first cover plate (14) and the second cover plate (16); the two ends of the stepped post (18) are respectively inserted into the first cover plate (14) and the second cover plate (16); the first cover plate (14) has a first positioning hole corresponding to the position of the positioning pin (19); the second cover plate (16) has a second positioning hole corresponding to the position of the positioning pin (19); the two ends of the positioning pin (19) are respectively inserted into the first positioning hole and the second positioning hole.

9. The metering pump with an improved cellulose acetate structure according to claim 1, characterized in that: The drive shaft (2) is provided with a key (24) on the outer wall inside the intermediate plate (15); the drive gear (21) is coaxially and detachably mounted on the outer wall of the drive shaft (2) through the key (24).

10. A metering pump with an improved cellulose acetate structure according to claim 2, characterized in that: The bearing (44) is provided with a first limiting ring (441) on the outer circumferential surface of the sealing sleeve (5) and a second limiting ring (442) on the inner circumferential surface of the rotating seat (41).

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