Constant flow pump convenient to maintain

Abstract

The utility model relates to the technical field of liquid injection pumps, in particular to a constant flow pump convenient to maintain, which comprises a pump body and a driving component, a control cavity is arranged in the pump body, a servo motor is arranged in the control cavity in a penetrating manner, a flow channel is arranged on the end face of the pump body, a sliding cavity is arranged on the flow channel facing the control cavity, and a matching piece is arranged on the periphery of the pump body facing the opposite flow channel. A feeding part and a discharging part are arranged on the side wall of the matching part, and the feeding part and the discharging part are communicated with the runner; the driving assembly comprises an eccentric wheel assembly and a follow-up assembly, the eccentric wheel assembly is in driving connection with the servo motor, the follow-up assembly is in sliding connection with the sliding cavity, a connecting piece is arranged facing the eccentric wheel assembly, the eccentric wheel assembly penetrates through the connecting piece, and a mounting plate is arranged at the end, away from the matching piece, of the pump body. A sealing cover is connected in the through hole and provided with a sliding groove opposite to the connecting piece, and the connecting piece is connected to the sliding groove in a sliding mode. The flow stabilizing effect of the pump body is improved, and the pump body is convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid injection pumps, in particular to a constant flow pump which is easy to maintain. Background Art

[0002] With the continuous development of society and the continuous advancement of science and technology, the application of mechanical automation production is becoming more and more extensive. Constant flow pumps are used in perfusion equipment in many industries such as battery production, pharmaceutical production, biological reagents, and chemical industry. Its working principle is to make the flow rate of the pump not change with the change of outlet pressure, and to ensure the constant flow rate of the fluid under different working conditions, which is conducive to ensuring product quality and consistency.

[0003] In the related art, an eccentric wheel assembly driven by a motor is provided in the pump body, and a plurality of groups of plungers are provided in the pump body facing the eccentric wheel assembly. One end of the plunger is inserted into the pipeline, and a roller is provided at the other end facing the plunger. A return spring is provided at the periphery of the plunger relative to the pump body. When the eccentric wheel hits the roller, it will drive the plunger to squeeze the pipeline. When the eccentric wheel leaves the pipeline, the return spring will drive the pump body to reset. However, the elasticity of the spring is fatigued and cannot ensure steady flow. Frequent damage is not conducive to equipment maintenance. Utility Model Content

[0004] The main purpose of the utility model is to provide a constant flow pump which is easy to maintain, aiming at improving the steady flow effect of the pump body and making the pump body easy to maintain.

[0005] To achieve the above-mentioned purpose, the utility model provides a constant flow pump that is easy to maintain, including a pump body and a drive assembly:

[0006] The pump body is provided with a control cavity, a servo motor is inserted into the control cavity, a flow channel is provided on the end surface of the pump body, a sliding cavity is provided on the flow channel facing the control cavity, a matching piece is provided on the peripheral edge of the pump body facing the flow channel, a feed piece and a discharge piece are provided on the side wall of the matching piece, the feed piece and the discharge piece are connected to the flow channel, and together constitute a flow structure; and

[0007] The driving assembly is passed through the control cavity, and the driving assembly includes an eccentric wheel assembly and a follower assembly. The eccentric wheel assembly is driven and connected to the servo motor, and the follower assembly is slidably connected to the sliding cavity, and a connecting piece is provided facing the eccentric wheel assembly. The eccentric wheel assembly is passed through the connecting piece, and a mounting plate is provided at one end of the pump body away from the mating piece. The mounting plate is provided with a through hole relative to the sliding cavity, a sealing cover is connected in the through hole, and a sliding groove is provided in the sealing cover relative to the connecting piece, and the connecting piece is slidably connected to the sliding groove.

[0008] In one embodiment of the present application, the sliding chambers are provided in a plurality of groups, and the plurality of sliding chambers are evenly spaced along the extension direction of the eccentric wheel assembly. The sealing covers are relatively provided in a plurality of groups, and each sliding chamber corresponds to a sealing cover.

[0009] In one embodiment of the present application, the cover includes a mounting flange and a dust cover:

[0010] The mounting flange is connected to the mounting plate and penetrates the through hole, and the slide groove is provided on the end surface of the mounting flange facing the control cavity; and

[0011] The dust cover is connected to the end surface of the mounting flange facing away from the control cavity and is clamped in the slide groove.

[0012] In one embodiment of the present application, the eccentric wheel assembly includes a rotating shaft and a cam:

[0013] One end of the rotating shaft is drivingly connected to the servo motor, and the other end is rotatably connected to the inner wall of the control cavity;

[0014] The cam sleeve is arranged on the rotating shaft, and a plurality of cams are arranged relative to the sliding cavity. The plurality of cams protrude at different angles relative to the rotating shaft, and the sum of the different protruding angles of the plurality of cams is equal to 360°. The cams are evenly spaced on the rotating shaft.

[0015] In one embodiment of the present application, a clamping piece is provided on the rotating shaft, a key slot is formed on the cam relative to the clamping piece, the key slot is clamped to the clamping piece, a stabilizing block is provided between adjacent cams, and the stabilizing block is clamped to the clamping piece.

[0016] In one embodiment of the present application, the cam includes a connecting portion and a protruding portion:

[0017] The connecting portion is sleeved on the rotating shaft, and a plurality of key grooves are circumferentially formed on the inner wall of the connecting portion; and

[0018] The protruding portion is sleeved on the outer wall of the connecting portion and is arranged facing the connecting piece.

[0019] In one embodiment of the present application, the connecting member is wrapped around the cam, and the inner wall of the connecting member is close to one end of the follower assembly and one end of the cover, and a group of rollers are respectively provided relative to the cam, and the two rollers are arranged opposite to each other.

[0020] The technical solution of the utility model adopts the method of structurally dividing the constant flow pump into a pump body and a driving component. A control chamber is provided in the pump body, the driving component is integrally installed in the control chamber, and is driven by a servo motor installed on the pump body and inserted into the control chamber. A flow channel is provided on the end surface of the outer wall of the pump body, the flow channel includes a main channel and a plurality of tributaries, which are used for stably and rapidly conveying materials. A sliding chamber is provided between the tributaries and the control chamber, each tributary is provided with a group of sliding chambers, the driving component is composed of an eccentric wheel component and a follower component, the follower component is provided with a plunger relative to the sliding chamber, the plunger is slidably connected in the sliding chamber, and the plunger is driven by the eccentric wheel component to perform periodic motion between being away from the tributary and being close to the tributary, so as to achieve stable conveying of materials. For the purpose, a matching piece is installed at the periphery of the pump body near the flow channel. In the present application, the matching piece is completely screwed on the pump body and includes a feed piece, a discharge piece and a packaging piece. The feed piece and the discharge piece are connected to the flow channel. The packaging piece packages the flow channel to form a flow structure. When maintenance is required, the packaging piece can be directly removed to inspect the flow channel, which can make the entire structure easy to maintain. At the same time, the cavity encapsulated by the packaging piece and the flow channel is connected to the plunger piece, which can be beneficial to the driving assembly for liquid transportation. The eccentric wheel assembly is driven and connected to the servo motor, and the plunger piece of the follower assembly is provided with a connecting piece facing the eccentric wheel assembly. The connecting piece is wrapped around the eccentric wheel assembly. When the eccentric wheel assembly rotates, it can drive the connecting piece relative to The flow channel makes reciprocating motion, and multiple groups of plungers, connecting pieces, and eccentric wheels can be arranged in sequence along the extension direction of the eccentric wheel assembly, so that when the eccentric wheel assembly rotates, when one group of plungers is pumping liquid, there is always another group discharging liquid, so that the pump body is in a stable pumping and discharging state, thereby improving the steady flow effect of the entire pump body. A mounting plate is arranged at one end of the pump body away from the matching piece, and the mounting plate can also be fixed by bolts. Similarly, other fixing methods that can be easily disassembled, such as arranging a card slot on the pump body for card connection, can also play the same role. A perforation is arranged on the mounting plate relative to the sliding cavity, and the connecting piece is arranged corresponding to the perforation. A sealing cover is arranged at one end of the perforation away from the control cavity, and the sealing cover is penetrated through the perforation and has a slide groove facing the connecting piece. The connecting piece is slidably connected in the slide groove, one end of the connecting piece is fixed to the plunger piece, and the plunger piece is arranged relative to the branch flow and slidably connected in the sliding cavity, and the connecting piece is slidably connected in the slide groove, and sliding grooves can be arranged on the two side walls of the control cavity relative to the two sides of the connecting piece, so that the follower assembly can be stably installed in the control cavity. When the follower assembly needs to be refueled or overhauled, it is only necessary to remove the corresponding cover, and then the detector can be inserted to overhaul the entire pump body, which can effectively improve the maintenance efficiency and avoid damage to the pump body. The eccentric wheel assembly is wrapped inside by the connecting piece, so that the eccentric wheel assembly can be driven to work more stably by pushing the connecting piece close to one end of the plunger piece / cover, so that the constant flow pump has a better flow stabilization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A structural schematic diagram of a constant flow pump that is easy to maintain according to the utility model from one perspective;

[0023] Figure 2 This is a structural schematic diagram of the constant flow pump of the utility model which is easy to maintain from another perspective;

[0024] Figure 3 A cross-sectional view of a constant flow pump from one perspective that is easy to maintain according to the utility model;

[0025] Figure 4 A cross-sectional view of the constant flow pump of the utility model which is easy to maintain from another perspective;

[0026] Figure 5 This is a schematic diagram of the drive assembly structure of the constant flow pump that is easy to maintain according to the utility model;

[0027] Figure 6 The utility model is a schematic diagram of the structure of the eccentric wheel assembly of the constant flow pump which is easy to maintain.

[0028] Description of Figure Numbers:

[0029] 1. Pump body; 11. Flow channel; 12. Control chamber; 13. Sliding chamber; 14. Servo motor; 2. Matching parts; 21. Feeding parts; 22. Discharging parts; 3. Mounting plate; 31. Perforation; 4. Cover; 41. Mounting flange; 42. Slide groove; 43. Dust cover; 5. Drive assembly; 6. Eccentric wheel assembly; 61. Rotating shaft; 62. Snap-on parts; 63. Cam; 64. Connecting part; 65. Keyway; 66. Protrusion; 67. Stabilizing block; 7. Follow-up assembly; 71. Connecting part; 72. Roller.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] Reference Figures 1 to 6In one embodiment of the utility model, a constant flow pump that is easy to maintain is proposed, including a pump body 1 and a drive assembly 5. A control chamber 12 is provided in the pump body 1, a servo motor 14 is inserted in the control chamber 12, a flow channel 11 is provided on the end surface of the pump body 1, and a sliding chamber 13 is provided on the flow channel 11 facing the control chamber 12. A matching piece 2 is provided on the peripheral edge of the pump body 1 facing the flow channel 11, and a feed piece 21 and a discharge piece 22 are provided on the side wall of the matching piece 2. The feed piece 21 and the discharge piece 22 are connected to the flow channel 11 and together constitute a flow structure; drive assembly 5 is penetrated in the control cavity 12, the driving assembly 5 includes an eccentric wheel assembly 6 and a follower assembly 7, the eccentric wheel assembly 6 is drivingly connected to the servo motor 14, the follower assembly 7 is slidably connected to the sliding cavity 13, and a connecting piece 71 is provided facing the eccentric wheel assembly 6, the eccentric wheel assembly 6 is penetrated in the connecting piece 71, a mounting plate 3 is provided at one end of the pump body 1 away from the matching piece 2, the mounting plate 3 is provided with a through hole 31 relative to the sliding cavity 13, a sealing cover 4 is connected in the through hole 31, a sliding groove 42 is provided in the sealing cover 4 relative to the connecting piece 71, and the connecting piece 71 is slidably connected to the sliding groove 42.

[0033] In a constant flow pump that is easy to maintain in the present application, the constant flow pump is structurally divided into a pump body 1 and a drive assembly 5, a control chamber 12 is provided in the pump body 1, the drive assembly 5 is installed as a whole in the control chamber 12, and is driven by a servo motor 14 installed on the pump body 1 and inserted into the control chamber 12, a flow channel 11 is provided on the end surface of the outer wall of the pump body 1, the flow channel 11 includes a main channel 11 and a plurality of tributaries, which are used for stable and rapid material transportation, a sliding chamber 13 is provided between the tributaries and the control chamber 12, each tributary is provided with a group of sliding chambers 13, the drive assembly 5 is composed of an eccentric wheel assembly 6 and a follower assembly 7, the follower assembly 7 is provided with a plunger relative to the sliding chamber 13, the plunger is slidably connected to the sliding chamber 13, and the plunger is driven by the eccentric wheel assembly 6 to move away from the sliding chamber 13. The tributary and the adjacent tributary make periodic movements to achieve the purpose of stable material transportation. A matching piece 2 is installed at the periphery of the pump body 1 near the flow channel 11. In the present application, the matching piece 2 is completely screwed on the pump body 1 and includes a feed piece 21, a discharge piece 22, and a packaging piece. The feed piece 21 and the discharge piece 22 are connected to the flow channel 11. The packaging piece packages the flow channel 11 to form a flow structure. When maintenance is required, the packaging piece can be directly removed to inspect the flow channel 11, which can make the entire structure easy to maintain. At the same time, the cavity encapsulated by the packaging piece and the flow channel 11 is connected to the plunger piece, which can be beneficial to the driving component 5 for liquid transportation. The eccentric wheel component 6 is driven and connected to the servo motor 14, and the plunger piece of the follower component 7 faces the eccentric wheel component 6. A connecting piece 71 is provided, and the connecting piece 71 is wrapped around the eccentric wheel assembly 6. When the eccentric wheel assembly 6 rotates, it can drive the connecting piece 71 to reciprocate relative to the flow channel 11. The plunger, the connecting piece 71, and the eccentric wheel can be provided with multiple groups in sequence along the extension direction of the eccentric wheel assembly 6, so that when the eccentric wheel assembly 6 rotates, when one group of plungers is pumping liquid, there is always a group that is discharging liquid, so that the pump body 1 is in a stable pumping and discharging state, improving the flow stabilization effect of the entire pump body 1. The end of the pump body 1 away from the matching piece 2 is provided with a mounting plate 3, and the mounting plate 3 can also be fixed by bolts. Similarly, other fixing methods that can be easily disassembled, such as providing a card slot on the pump body 1 for card connection, can also play the same operation. The mounting plate 3 is provided with a perforation 3 relative to the sliding cavity 13 1. The connecting member 71 is arranged corresponding to the through hole 31. The end of the through hole 31 away from the control chamber 12 is provided with a cover 4. The cover 4 is penetrated through the through hole 31 and has a slide groove 42 facing the connecting member 71. The connecting member 71 is slidably connected in the slide groove 42. One end of the connecting member 71 is fixed to the plunger, and the plunger is arranged relative to the branch and slidably connected in the sliding chamber 13. The connecting member 71 is slidably connected in the slide groove 42, and the two side walls of the control chamber 12 can be provided with sliding grooves on both sides of the connecting member 71, so that the follower assembly 7 can be stably installed in the control chamber 12. When the follower assembly 7 needs to be refueled or overhauled, it is only necessary to remove the corresponding cover 4, and the detector can be inserted to overhaul the entire pump body 1, which can effectively improve the maintenance efficiency and avoid damage to the pump body 1.The eccentric wheel assembly 6 is surrounded by the connecting member 71, so that the eccentric wheel assembly 6 can drive the entire pump body 1 to work more stably by pushing the connecting member 71 close to one end of the plunger / cover 4, so that the constant flow pump has a better flow stabilization effect.

[0034] Combined with reference Figure 3 In one embodiment of the present application, a plurality of sliding chambers 13 are provided, and the plurality of sliding chambers 13 are evenly spaced along the extension direction of the eccentric wheel assembly 6 , and a plurality of sealing covers 4 are provided relatively, and each sliding chamber 13 corresponds to a sealing cover 4 .

[0035] In a constant flow pump that is easy to maintain in the present application, the sliding chamber 13 is provided with multiple groups, and the follower assembly 7 is provided with multiple groups relative to the sliding chamber 13. The plunger members of each follower assembly 7 correspond to a group of plunger members, and the matching cover 4 is also provided with multiple groups, so that the follower assembly 7 can be stably installed in the control chamber 12. With such a structure, when the eccentric wheel assembly 6 rotates, the cam 63 can drive the follower assembly 7 to perform periodic motion, so that the pump body 1 can be constantly in a synchronous working state of suction and discharge, so that the constant flow pump has a stronger flow stabilizing effect.

[0036] Combined with reference Figures 1 to 3 In one embodiment of the present application, the cover 4 includes a mounting flange 41 and a dust cover 43. The mounting flange 41 is connected to the mounting plate 3 and is penetrated through the through hole 31. The slide groove 42 is opened on the end surface of the mounting flange 41 facing the control chamber 12; the dust cover 43 is connected to the end surface of the mounting flange 41 facing away from the control chamber 12 and is clamped in the slide groove 42.

[0037] In a constant flow pump that is easy to maintain in the present application, the cover 4 includes a mounting flange 41 and a dust cover 43. In the present embodiment, the mounting flange 41 is screwed to the mounting plate 3 by bolts, and part of it is penetrated in the through hole 31, and a slide groove 42 is provided facing the control chamber 12. The slide groove 42 can be used to limit the follower assembly 7 and make it work stably. The slide groove 42 can be provided with a through hole 31 on the mounting flange 41. By modifying the hole, oil can be directly injected into structures such as the connecting piece 71 and the roller 72, so that the pump body 1 works stably. The dust cover 43 is provided on the mounting flange 41 and the through hole 31 is blocked to prevent dust from entering the control chamber 12 during normal operation, causing contamination in the control chamber 12, and affecting the stable operation of the roller 72, the connecting piece 71, and the eccentric wheel assembly 6.

[0038] Combined with reference Figures 3 to 5In one embodiment of the present application, the eccentric wheel assembly 6 includes a rotating shaft 61 and a cam 63. One end of the rotating shaft 61 is drivingly connected to the servo motor 14, and the other end is rotatably connected to the inner wall of the control chamber 12; the cam 63 is sleeved on the rotating shaft 61, and a plurality of cams 63 are provided relative to the sliding chamber 13. The plurality of cams 63 protrude at different angles relative to the rotating shaft 61, and the sum of the different protruding angles of the plurality of cams is equal to 360°, and the cams are evenly spaced on the rotating shaft 61.

[0039] In a constant flow pump that is easy to maintain in the present application, the eccentric wheel assembly 6 includes a rotating shaft 61 and a cam 63. The rotating shaft 61 is stably driven by a servo motor 14, and multiple groups of cams 63 are evenly sleeved on the rotating shaft 61. Because the constant flow pump can play a constant flow role, the principle is that among the multiple tributaries of the constant flow pump, there is always a tributary in a pumping state, and another tributary is in a discharging state, forming a continuous suction and discharge cycle, which cycle is linearly related to the angle of the cam 63. Generally, multiple groups of cams 63 divide 360° in half, making the cycle more uniform. Similarly, the protrusion may not divide 360° in half. In a feasible embodiment, the sum of the different angles of the multiple groups of cams relative to the rotating shaft is equal to 360 degrees, which means that the multiple groups of cams rotate one circle around the axis, and the sum of the discharge stroke angles of each group of cams is equal to 360 degrees, the sum of the static stroke angles is equal to 360 degrees*(number of cam groups-2), and the sum of the suction stroke angles is equal to 360 degrees. For example, in three groups of cams, under special circumstances, the discharge, stationary and suction stroke angles of each group of cams are equal, discharge 120 degrees + stationary -60 degrees + suction 120 degrees + stationary 260 degrees, one of the other situations: cam 1 discharges 100 degrees + stationary -60 degrees + suction 140 degrees + stationary 260 degrees, cam 2 discharges 120 degrees + stationary -60 degrees + suction 120 degrees + stationary 260 degrees, cam 3 discharges 140 degrees + stationary -60 degrees + suction 100 degrees + stationary 260 degrees. Through the structural design of this cam, it can be effectively guaranteed that the constant flow pump achieves a steady flow effect. In this embodiment, three groups of cams 63 are provided. The protruding parts of the cams 63 cover more than 120°, so that when the vector angles of adjacent cams 63 are not 120°, the steady flow effect can also be guaranteed. At the same time, this structure can reduce the different pressures caused by the different relative positions of different tributaries and the main channel 11 in the flow channel 11, thereby improving the steady flow effect.

[0040] Combined with reference Figures 5 and 6 In one embodiment of the present application, a clamping member 62 is provided on the rotating shaft 61, and a key slot 65 is formed on the cam 63 relative to the clamping member 62, and the key slot 65 is clamped to the clamping member 62, and a stabilizing block 67 is provided between adjacent cams 63, and the stabilizing block 67 is clamped to the clamping member 62.

[0041] In a constant flow pump that is easy to maintain in the present application, a clamping piece 62 is provided on the rotating shaft 61, and a keyway 65 is provided on the cam 63. The keyway 65 is connected to the clamping piece 62 to ensure the stable installation of the cam 63. A stabilizing block 67 is provided between adjacent cams 63. This structure can make the entire eccentric wheel assembly 6 easy to maintain and assemble, and can ensure the strength of the eccentric wheel assembly 6 during operation, thereby avoiding damage to the eccentric wheel assembly 6.

[0042] Combined with reference Figures 5 and 6 In one embodiment of the present application, the cam 63 includes a connecting portion 64 and a protruding portion 66. The connecting portion 64 is sleeved on the rotating shaft 61, and a plurality of key grooves 65 are circumferentially opened on the inner wall of the connecting portion 64; the protruding portion 66 is sleeved on the outer wall of the connecting portion 64 and is arranged facing the connecting member 71.

[0043] In a constant flow pump that is easy to maintain in the present application, the cam 63 includes a connecting portion 64 and a protruding portion 66. Such a structure can make the cam 63 easy to produce and design. The connecting portions 64 of different cams 63 are the same, and the protruding portions 66 are also the same. However, by opening a keyway 65 on the inner wall of the connecting portion 64, multiple groups of keyways 65 are opened evenly or unevenly, so that different keyways 65 are clamped on the clamping piece 62, the cam 63 can be stably installed at different angles.

[0044] Combined with reference Figures 3 to 5 In one embodiment of the present application, the connecting member 71 is wrapped around the cam 63, and the inner wall of the connecting member 71 is close to one end of the follower assembly 7 and one end of the cover 4, and a group of rollers 72 are respectively provided relative to the cam 63, and the two rollers 72 are arranged opposite to each other.

[0045] In a constant flow pump that is easy to maintain in the present application, a connecting member 71 is wrapped around the cam 63, and a group of rollers 72 are respectively provided on the two ends of the movement path of the connecting member 71 relative to the plunger member. The two groups of rollers 72 are arranged opposite to each other, and the rollers 72 are pushed by the cam 63, and the rollers 72 drive the entire follower assembly 7 to perform periodic motion. The rollers 72 can protect the cam 63 and the connecting member 71 to prevent the drive assembly 5 from being damaged due to collision during operation, thereby improving the strength of the entire structure and making the pump body 1 itself easy to maintain.

[0046] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A constant flow pump that is easy to maintain, characterized in that: include: A pump body, wherein a control cavity is provided in the pump body, a servo motor is inserted in the control cavity, a flow channel is provided on the end surface of the pump body, a sliding cavity is provided on the flow channel facing the control cavity, a matching piece is provided on the peripheral edge of the pump body facing the flow channel, a feed piece and a discharge piece are provided on the side wall of the matching piece, the feed piece and the discharge piece are connected to the flow channel, and together constitute a flow structure; and A driving assembly, wherein the driving assembly is passed through the control cavity, the driving assembly comprises an eccentric wheel assembly and a follower assembly, the eccentric wheel assembly is drivingly connected to the servo motor, the follower assembly is slidably connected to the sliding cavity, and a connecting piece is provided facing the eccentric wheel assembly, the eccentric wheel assembly is passed through the connecting piece, an installation plate is provided at one end of the pump body away from the mating piece, the installation plate is provided with a through hole relative to the sliding cavity, a sealing cover is connected in the through hole, the sealing cover is provided with a sliding groove relative to the connecting piece, and the connecting piece is slidably connected to the sliding groove.

2. A constant flow pump that is easy to maintain according to claim 1, characterized in that: The sliding chambers are provided with a plurality of groups, and the plurality of sliding chambers are evenly spaced along the extension direction of the eccentric wheel assembly. The sealing covers are relatively provided with a plurality of groups, and each sliding chamber corresponds to a sealing cover.

3. A constant flow pump easy to maintain according to claim 2, characterized in that: The cover comprises: A mounting flange, the mounting flange is connected to the mounting plate and is penetrated through the through hole, the slide groove is provided on an end surface of the mounting flange facing the control chamber; and A dust cover is connected to the end surface of the mounting flange facing away from the control cavity and is clamped in the slide groove.

4. A constant flow pump easy to maintain according to any one of claims 1 to 3, characterized in that: The eccentric wheel assembly comprises: a rotating shaft, one end of which is drivingly connected to the servo motor and the other end of which is rotatably connected to the inner wall of the control chamber; and The cam is sleeved on the rotating shaft, and a plurality of cams are arranged relative to the sliding cavity. The plurality of cams protrude at different angles relative to the rotating shaft, and the sum of the different protruding angles of the plurality of cams is equal to 360°. The cams are evenly spaced on the rotating shaft.

5. A constant flow pump easy to maintain according to claim 4, characterized in that: A clamping piece is arranged on the rotating shaft, a key slot is formed on the cam relative to the clamping piece, the key slot is clamped on the clamping piece, a stabilizing block is arranged between adjacent cams, and the stabilizing block is clamped on the clamping piece.

6. A constant flow pump easy to maintain according to claim 5, characterized in that: The cam comprises: A connecting portion, the connecting portion is sleeved on the rotating shaft, and a plurality of key grooves are circumferentially formed on the inner wall of the connecting portion; and The protruding portion is sleeved on the outer wall of the connecting portion and is arranged facing the connecting piece.

7. A constant flow pump easy to maintain according to claim 4, characterized in that: The connecting member is wrapped around the cam, and the inner wall of the connecting member is close to one end of the follower assembly and one end of the sealing cover, and a group of rollers are respectively arranged relative to the cam, and the two rollers are arranged opposite to each other.

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