Constant flow pump

Abstract

The present application relates to the technical field of injection pumps, and in particular to a constant current pump. The constant current pump comprises: a pump body, the pump body is provided with a liquid outlet, a first confluence channel and a plurality of plunger cavities, and a first shunt channel and a second shunt channel are provided corresponding to each plunger cavity, one end of the first shunt channel is connected to the plunger cavity, and the other end is connected to the first confluence channel, the liquid outlet is connected to the first confluence channel, one end of the second shunt channel is connected to the plunger cavity, and the other end is used for liquid inlet; a pump head assembly, the pump head assembly comprises a plurality of plungers, and the plurality of plungers correspond to the plurality of plunger cavities one by one, and the plunger can be reciprocatingly slidably sealed and arranged in the plunger cavity. The constant current pump provided by the present application can reduce the maintenance cost of the constant current pump and provide a better user experience.

Description

Technical Field

[0001] The present application relates to the technical field of liquid injection pumps, and in particular to a constant flow pump. Background Art

[0002] In lithium battery production lines, electrolyte is usually injected into the inner cavity of lithium batteries through metering pumps. Since the flow of electrolyte needs to be accurately measured, and conventional metering pumps often have pulse phenomena, constant current pumps are designed to solve the above problem.

[0003] In the constant flow pump in the related art, such as CN205260243U, the cam is reset by a spring after rotation. During use, the service life of the spring is relatively short and needs to be replaced frequently, resulting in high maintenance costs for the constant flow pump and poor user experience. Summary of the invention

[0004] The present application discloses a constant flow pump, which can reduce the maintenance cost of the constant flow pump and provide a better user experience.

[0005] In order to achieve the above object, the present application discloses a constant flow pump, comprising:

[0006] A pump body, wherein the pump body is provided with a liquid outlet, a first converging channel and a plurality of plunger cavities, wherein a first shunt channel and a second shunt channel are provided corresponding to each plunger cavity, wherein one end of the first shunt channel is communicated with the plunger cavity and the other end is communicated with the first converging channel, the liquid outlet is communicated with the first converging channel, one end of the second shunt channel is communicated with the plunger cavity and the other end is used for liquid inlet, the first shunt channel and the second shunt channel are both unidirectional channels, and the flow direction of the liquid in the unidirectional channel is configured to flow from the second shunt channel to the first shunt channel;

[0007] A pump head assembly, the pump head assembly comprising a plurality of plungers, the plurality of plungers corresponding to the plurality of plunger cavities one by one, the plungers being reciprocatingly slidably sealed and disposed in the plunger cavities;

[0008] A cam driving assembly, the cam driving assembly includes a transmission shaft, a driving member and a plurality of cams, the transmission shaft is rotatably arranged on the pump body, the plurality of cams are installed on the transmission shaft and correspond to the plurality of plungers one by one, each of the plungers is slidably connected to the cam along the circumference of the cam, at least two of the plurality of cams have different eccentric directions relative to the transmission shaft, the driving member is used to drive the transmission shaft to rotate and drive the plunger to slide back and forth in the plunger cavity, so as to draw the liquid into the plunger cavity through the second diversion channel and inject the liquid into the first confluence channel through the first diversion channel.

[0009] Since there are multiple plunger cavities, there are also multiple plungers and they correspond one-to-one to the multiple plunger cavities. Since multiple cams are installed on the transmission shaft and correspond one-to-one to the multiple plungers, each plunger is slidably connected to the cam along the circumference of the cam. Therefore, when the driving member drives the transmission shaft to rotate, it can simultaneously drive multiple plungers to slide back and forth in the corresponding plunger cavities, thereby greatly improving the efficiency of the constant flow pump in pumping and injecting liquid through the plunger.

[0010] In addition, since the eccentric directions of at least two cams among the multiple cams relative to the transmission shaft are different, in layman's terms, the installation directions of at least two cams among the multiple cams on the transmission shaft are different. Therefore, when the driving member drives the transmission shaft to rotate, drives the multiple cams to rotate, and then synchronously drives the multiple plungers to slide back and forth in the corresponding plunger chambers, the movement states of at least two of the multiple plungers will be asynchronous, and the first plunger among the at least two plungers may slide along the first direction while the second plunger among the at least two plungers may slide along the second direction.

[0011] In this way, the timing of injecting liquid into the first confluence channel through the first plunger and the second plunger can be different, that is, the timing of injecting liquid into the first confluence channel through at least two of the multiple plungers can be different. In this way, compared with the method of injecting liquid into the first confluence channel through multiple plungers at the same time, the constant current pump provided in the present application can make the flow rate of the liquid injected into the first confluence channel more uniform, and there will be no pulse injection phenomenon, thereby making the flow rate of the liquid discharged outside the constant current pump through the liquid outlet more uniform, so that the constant current pump can accurately measure the flow rate, and the injection accuracy is higher when injecting liquid into the part to be injected.

[0012] In addition, since the plunger is slidably connected to the cam along the circumference of the cam, when the cam rotates with the transmission shaft, the purpose of driving the plunger to slide back and forth in the plunger cavity can be achieved. In other words, it is only necessary to make the plunger slidably connected to the cam along the circumference of the cam. As the cam rotates, the purpose of driving the plunger to slide back and forth in the plunger cavity can be achieved. The implementation method is very simple, which can simplify the structure of the constant current pump to a certain extent and reduce the manufacturing cost of the constant current pump.

[0013] Furthermore, since the cam is arranged on the transmission shaft, the rotation of the cam is achieved by the rotation of the transmission shaft, and the resetting of the cam is also achieved by the rotation of the transmission shaft. Compared with the method in the related art that the cam needs to be reset by a spring after rotation, which leads to the need to frequently replace the spring, the method of resetting the cam by rotating the transmission shaft in the present application is more reliable, and there is no need for frequent replacement of parts, which makes the maintenance cost of the constant flow pump lower and the user experience better.

[0014] Optionally, a cam groove is provided on the cam, and the cam groove is arranged along the circumference of the cam. The plunger is slidably arranged in the cam groove along the circumference of the cam, so that the plunger is slidably connected to the cam along the circumference of the cam.

[0015] By providing a cam groove on the cam and allowing the plunger to be slidably arranged in the cam groove along the circumference of the cam groove, the purpose of slidably connecting the plunger to the cam along the circumference of the cam can be achieved. The implementation method is very simple. Therefore, the complexity of slidably connecting the plunger to the cam along the circumference of the cam can be reduced to a certain extent.

[0016] Optionally, the cam has a first surface and a second surface disposed opposite to each other, and the cam groove is disposed on the first surface.

[0017] By arranging the cam groove on the first surface, since the first surface of the cam is relatively regular and has a larger area, it is convenient for processing the cam groove.

[0018] Optionally, the first surface is arranged vertically upward.

[0019] The lubricating oil in the cam groove can be prevented or reduced from dripping from the cam groove to other parts of the constant current pump, thereby preventing other parts of the constant current pump from being polluted or affecting the normal operation of other parts of the constant current pump, making the entire constant current pump cleaner and more reliable in operation.

[0020] Optionally, a first driven bearing is rotatably provided on the plunger, the axial direction of the first driven bearing is parallel to the axial direction of the transmission shaft, and the first driven bearing is slidably provided in the cam groove along the circumferential direction of the cam groove.

[0021] The first driven bearing is slidably arranged in the cam groove along the circumferential direction of the cam groove. Since the axial direction of the first driven bearing is parallel to the axial direction of the transmission shaft, when the plunger slides along the circumferential direction of the cam, relative rolling will occur between the first driven bearing and the cam, so that the friction between the plunger and the cam is rolling friction. In this way, the friction force between the plunger and the cam can be greatly reduced, making the plunger smoother when sliding along the circumferential direction of the cam.

[0022] Optionally, a groove width of the cam groove is greater than a diameter of the first driven bearing.

[0023] By making the groove width of the cam groove larger than the diameter of the first driven bearing, it is possible to avoid the first driven bearing being stuck in the cam groove, thereby making the operation of the constant current pump more reliable.

[0024] Optionally, a second driven bearing rotatably arranged on the plunger and spaced apart from the first driven bearing, the axial direction of the second driven bearing is parallel to the axial direction of the first driven bearing, a clamping ring portion is formed between the cam groove and the peripheral wall of the cam, the second driven bearing and the first driven bearing are respectively located on both sides of the clamping ring portion and are respectively slidably abutted against two side surfaces of the clamping ring portion, and the distance between the two side surfaces of the clamping ring portion is equal.

[0025] Since the axial direction of the second driven bearing is parallel to the axial direction of the first driven bearing, and the second driven bearing and the first driven bearing are respectively located on both sides of the clamping ring and are respectively slidably abutted against the two side surfaces of the clamping ring, that is to say, the clamping ring is clamped between the second driven bearing and the first driven bearing. In this way, the shaking of the plunger when sliding along the circumferential direction of the cam can be avoided, thereby improving the movement accuracy.

[0026] Optionally, a plunger connecting rod is further provided on the plunger, and the first driven bearing and the second driven bearing can be rotatably provided on the plunger connecting rod.

[0027] By making the first driven bearing and the second driven bearing both rotatably arranged on the plunger connecting rod, it is possible to avoid the situation where the precision of the plunger is affected due to the first driven bearing and the second driven bearing being directly arranged on the plunger.

[0028] Optionally, a guide rod is provided on the plunger connecting rod, and a guide hole is provided on the pump body corresponding to the guide rod. The guide rod is reciprocatingly slidably arranged in the guide hole along the axial direction of the guide hole, and the axial direction of the guide hole is parallel to the sliding direction of the plunger.

[0029] Since the axial direction of the guide hole is parallel to the sliding direction of the plunger, the guide rod is arranged in the guide hole so as to slide back and forth along the axial direction of the guide hole. Therefore, by setting the guide rod, the guide rod can guide the reciprocating sliding of the plunger, so that the plunger will not rotate around the axial direction of the plunger when it slides back and forth.

[0030] Optionally, the number of the guide rods is greater than or equal to two.

[0031] By making the number of guide rods greater than or equal to two, on the one hand, it can better prevent the plunger from rotating, and on the other hand, it can make the plunger slide back and forth more smoothly.

[0032] Optionally, the plunger connecting rod has a deformation portion, and the first driven bearing and the second driven bearing are respectively located on both sides of the deformation portion, and the deformation portion is used to provide an abutment force between the first driven bearing and the second driven bearing after deformation, so that the second driven bearing and the first driven bearing are respectively slidably abutted against the two side surfaces of the clamping ring portion.

[0033] Before the clamping ring is clamped between the first driven bearing and the second driven bearing, the distance between the first driven bearing and the second driven bearing can be made slightly smaller than the distance between the two side surfaces of the clamping ring. In this way, when the clamping ring is clamped between the first driven bearing and the second driven bearing, the first driven bearing and the second driven bearing can be bent under the action of external force. Since the first driven bearing and the second driven bearing are respectively located on both sides of the deformation portion, when the first driven bearing and the second driven bearing are bent, the deformation portion can be deformed, thereby gradually increasing the distance between the first driven bearing and the second driven bearing until it is slightly larger than the distance between the two side surfaces of the clamping ring. Then, the clamping ring can be located between the first driven bearing and the second driven bearing.

[0034] After the clamping ring is located between the first driven bearing and the second driven bearing, the first driven bearing and the second driven bearing can be stopped from being bent, so that the deformation part can provide the first driven bearing and the second driven bearing with abutment force when they are reset after deformation, thereby achieving the purpose of making the first driven bearing and the second driven bearing slide and abut against the two side surfaces of the clamping ring respectively. The method of making the second driven bearing and the first driven bearing slide and abut against the two side surfaces of the clamping ring respectively is very simple, which can simplify the structure of the constant current pump to a certain extent and reduce the cost of the constant current pump.

[0035] Optionally, the deformation portion includes:

[0036] An extension portion, wherein the first driven bearing and the second driven bearing are both disposed on the extension portion;

[0037] A deformation hole is provided in the protruding portion and is located between the first driven bearing and the second driven bearing. After the protruding portion is deformed at the position where the deformation hole is located, the first driven bearing and the second driven bearing are provided with abutting force facing each other.

[0038] By providing a deformation hole in the protruding part, the position where the deformation hole is located can be easily deformed. When the protruding part is deformed at the position where the deformation hole is located, an abutment force between the first driven bearing and the second driven bearing can be provided, making the structure of the deformation part very simple.

[0039] Optionally, the deformable hole includes: a strip-shaped hole and / or a U-shaped hole.

[0040] Optionally, the strip-shaped hole comprises a plurality of first strip-shaped holes, each of the first strip-shaped holes penetrates the protruding portion along the extending direction of the transmission shaft, and the plurality of first strip-shaped holes are arranged in an array in a spaced relationship along a direction from the first driven bearing to the second driven bearing;

[0041] The U-shaped hole includes a plurality of first U-shaped holes and a plurality of second U-shaped holes, each of the first U-shaped holes penetrates the protruding portion along the extension direction of the transmission shaft and is located between two adjacent first strip holes, the plurality of first U-shaped holes are arranged in an array at intervals along the direction from the first driven bearing to the second driven bearing, the plurality of second U-shaped holes are symmetrically arranged with respect to a mirror plane and the plurality of first U-shaped holes, the mirror plane is coplanar with the direction from the first driven bearing to the second driven bearing and is parallel to the extension direction of the transmission shaft.

[0042] By making each first strip hole penetrate the protruding portion along the extension direction of the transmission shaft, multiple first strip holes are arranged in an array at intervals along the direction from the first driven bearing to the second driven bearing, and making each first U-shaped hole penetrate the protruding portion along the extension direction of the transmission shaft and be located between two adjacent first strip holes, multiple first U-shaped holes are arranged in an array at intervals along the direction from the first driven bearing to the second driven bearing, and multiple second U-shaped holes are symmetrically arranged with respect to the mirror plane and the multiple first U-shaped holes, the layout of the first strip holes, the first U-shaped holes and the second U-shaped holes on the protruding portion can be made more regular, so that the deformation degree of each position of the protruding portion can be made more uniform when it is deformed, and local fracture is less likely to occur.

[0043] Optionally, the first driven bearing and / or the second driven bearing are respectively rotatably arranged on the plunger via a mounting shaft, and the mounting shaft has a weak portion. After the mounting shaft is deformed at the weak portion, it provides an abutment force for at least one of the first driven bearing and the second driven bearing toward the other driven bearing, so that the first driven bearing and the second driven bearing are respectively slidably abutted against the two side surfaces of the clamping ring portion.

[0044] It is only necessary to set a weak portion on the mounting shaft to achieve the purpose of making the first driven bearing and the second driven bearing slide and abut against the two side surfaces of the clamping ring respectively. In other words, it is only necessary to slightly modify the mounting shaft to achieve the purpose of making the first driven bearing and the second driven bearing slide and abut against the two side surfaces of the clamping ring respectively. The implementation method is very simple and low-cost.

[0045] Optionally, a U-shaped recessed groove is provided along the circumference of the installation shaft, and the weak portion is formed at the installation shaft where the U-shaped recessed groove is located.

[0046] By arranging a U-shaped recessed groove along the circumference of the mounting shaft, the position where the U-shaped recessed groove is arranged on the mounting shaft can be made weaker than other positions, forming a weak portion, thereby making it easier for the mounting shaft to deform at the weak portion.

[0047] The method of forming a weak portion by arranging a U-shaped recessed groove along the circumference of the installation shaft is relatively simple and can reduce the cost of the installation shaft.

[0048] Optionally:

[0049] A first sliding block is movably arranged on the plunger in a direction from the first driven bearing to the second driven bearing, the first driven bearing is rotatably arranged on the first sliding block, a first elastic member is arranged between the first sliding block and the plunger, the first elastic member provides elastic force for the first sliding block to point from the first driven bearing to the second driven bearing, so that the first driven bearing and the second driven bearing are respectively slidably abutted against two side surfaces of the clamping ring;

[0050] and / or,

[0051] A second sliding block is movably provided on the plunger along a direction from the first driven bearing to the second driven bearing, the second driven bearing is rotatably provided on the second sliding block, a second elastic member is provided between the second sliding block and the plunger, the second elastic member provides elastic force for the second sliding block along the second driven bearing to point to the first driven bearing, so that the first driven bearing and the second driven bearing are respectively slidably abutted against two side surfaces of the clamping ring portion.

[0052] By driving the first driven bearing to slide toward the second driven bearing through the first elastic member, the purpose of making the first driven bearing and the second driven bearing slide and abut against the two side surfaces of the clamping ring portion respectively can be achieved. The implementation principle is very simple. In addition, since the elastic force of the first elastic member can be selected in a large range and can be quantified, the abutment force of the first driven bearing and the second driven bearing sliding and abutting against the two side surfaces of the clamping ring portion respectively can be easily controlled, which is more precise and more flexible.

[0053] Optionally, the first elastic member and / or the second elastic member is a disc spring.

[0054] When the first elastic member and / or the second elastic member is a disc spring, since the disc spring has the advantages of high rigidity and strong buffering and vibration absorbing ability, the constant current pump can be made to run more smoothly.

[0055] Optionally, the pump body comprises:

[0056] A body, wherein the plurality of plunger cavities, the first flow-dividing channel and the second flow-dividing channel are all disposed on the body;

[0057] A first confluence block, wherein the first confluence block is arranged on the body, the first confluence channel is arranged on the first confluence block, and the liquid outlet is arranged on the first confluence block.

[0058] By arranging the first confluence channel and the liquid outlet on the first confluence block, and arranging the plurality of plunger cavities, the first diversion channel and the second diversion channel on the main body, the processing of the first diversion channel and the second diversion channel in the main body can be facilitated, thereby reducing the processing difficulty of the first diversion channel and the second diversion channel, and thus reducing the cost of the pump body.

[0059] Optionally, the pump body further comprises:

[0060] The second confluence block is arranged on the main body, the second confluence block is provided with a second confluence channel and a liquid inlet, the other end of the second branch channel is connected to the second confluence channel, and the second confluence channel is connected to the liquid inlet.

[0061] By setting a second confluence block and setting the second confluence block on the main body, the second confluence block is provided with a second confluence channel and a liquid inlet, the other end of the second diversion channel is connected to the second confluence channel, and the second confluence channel is connected to the liquid inlet, so that liquid can be fed through the same liquid inlet, which is very convenient.

[0062] Optionally, the extension direction of the transmission shaft is a vertical direction, and the sliding direction of the plunger is a horizontal direction.

[0063] By making the extension direction of the transmission shaft vertical and the sliding direction of the plunger horizontal, the entire structure of the constant flow pump can be made more regular and easy to install.

[0064] Optionally, the number of the cams is three, and the eccentric directions of the three cams relative to the transmission shaft are different and differ by 120°.

[0065] When the number of cams is three, the eccentric directions of the three cams relative to the transmission shaft are different and differ by 120°. Since 120° is exactly one-third of 360°, that is to say, the eccentric directions of the three cams relative to the transmission shaft are evenly arranged along the circumference. In this way, the timing of injecting liquid into the first confluence channel by the three plungers corresponding to the three cams is different and the interval time is uniform. In this way, the flow rate of the liquid discharged from the constant flow pump through the liquid outlet can be more uniform, so that the constant flow pump can measure the flow rate more accurately and the injection accuracy when injecting liquid into the part to be injected is also higher.

[0066] Compared with the prior art, the beneficial effects of this application are:

[0067] Since the eccentric directions of at least two cams among the multiple cams relative to the transmission shaft are different, in layman's terms, the installation directions of at least two cams among the multiple cams on the transmission shaft are different. Therefore, when the driving member drives the transmission shaft to rotate, drives the multiple cams to rotate, and then synchronously drives the multiple plungers to slide back and forth in the corresponding plunger chambers, the movement states of at least two plungers among the multiple plungers will be asynchronous, and the first plunger among the at least two plungers may slide along the first direction while the second plunger among the at least two plungers slides along the second direction. In this way, the timing of injecting liquid into the first confluence channel through the first plunger and the second plunger can be different, that is, the timing of injecting liquid into the first confluence channel through at least two of the multiple plungers can be different. In this way, compared with the method of injecting liquid into the first confluence channel through multiple plungers at the same time, the constant current pump provided in the present application can make the flow rate of the liquid injected into the first confluence channel more uniform, and there will be no pulse injection phenomenon, thereby making the flow rate of the liquid discharged outside the constant current pump through the liquid outlet more uniform, so that the constant current pump can accurately measure the flow rate, and the injection accuracy is higher when injecting liquid into the part to be injected.

[0068] In addition, since the plunger is slidably connected to the cam along the circumference of the cam, when the cam rotates with the transmission shaft, the purpose of driving the plunger to slide back and forth in the plunger cavity can be achieved. In other words, it is only necessary to make the plunger slidably connected to the cam along the circumference of the cam. As the cam rotates, the purpose of driving the plunger to slide back and forth in the plunger cavity can be achieved. The implementation method is very simple, which can simplify the structure of the constant current pump to a certain extent and reduce the manufacturing cost of the constant current pump.

[0069] Furthermore, since the cam is arranged on the transmission shaft, the rotation of the cam is achieved by the rotation of the transmission shaft, and the resetting of the cam is also achieved by the rotation of the transmission shaft. Compared with the method in the related art that the cam needs to be reset by a spring after rotation, which leads to the need to frequently replace the spring, the method of resetting the cam by rotating the transmission shaft in the present application is more reliable, and there is no need for frequent replacement of parts, which makes the maintenance cost of the constant flow pump lower and the user experience better. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0071] Figure 1 This is a front view of a constant flow pump provided in an embodiment of the present application;

[0072] Figure 2 yes Figure 1 The cross-sectional view of the constant flow pump at position AA;

[0073] Figure 3 yes Figure 1 Left view of the constant flow pump in FIG.

[0074] Figure 4 yes Figure 3 The cross-sectional view of the constant flow pump at the BB position;

[0075] Figure 5 is a structural schematic diagram of a cam provided in an embodiment of the present application;

[0076] Figure 6 yes Figure 5 A schematic diagram of the structure of the cam in another perspective;

[0077] Figure 7 yes Figure 1 The structural diagram of the constant current pump in FIG. 2 with some structures omitted;

[0078] Figure 8 yes Figure 7 A top view of the constant flow pump in FIG.

[0079] Fig. 9 This is a schematic diagram of the structure of another constant current pump provided in an embodiment of the present application after omitting some structures (the first sliding block is also omitted in the uppermost layer along the positive direction of the Z axis);

[0080] Fig.10 yes Fig. 9 A top view of the constant flow pump in FIG.

[0081] Fig.11 yes Figure 7 Schematic diagram of the structure of the plunger connecting rod of the constant flow pump;

[0082] Fig.12 yes Fig.11 A top view of the plunger connecting rod in FIG.

[0083] Fig.13 This is a structural schematic diagram of another constant current pump provided in an embodiment of the present application with some structures omitted;

[0084] Fig.14 yes Fig.13 Schematic diagram of the structure in which the first driven bearing is installed on the mounting shaft.

[0085] Description of main reference numerals

[0086] 1- pump body; 11- liquid outlet; 12- first confluence channel; 13- plunger cavity; 14- first shunt channel; 15- second shunt channel; 16- main body; 17- first confluence block; 18- second confluence block; 181- second confluence channel; 182- liquid inlet;

[0087] 2-pump head assembly; 21-plunger;

[0088] 3-cam driving assembly; 31-transmission shaft; 32-driving member; 33-cam; 331-cam groove; 332-first surface; 333-second surface; 334-clamping ring;

[0089] 4-First driven bearing;

[0090] 5- Second driven bearing;

[0091] 6- plunger connecting rod; 61- guide rod; 62- deformation part; 621- extension part; 622- deformation hole; 6221- first strip hole; 6222- first U-shaped hole; 6223- second U-shaped hole;

[0092] 7-installation shaft; 71-weak part;

[0093] 8-first sliding block; 81-first elastic member;

[0094] F- circumferential direction of the cam; S- mirror plane. DETAILED DESCRIPTION

[0095] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0096] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0097] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0098] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0099] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0100] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0101] Figure 1 is a front view of a constant flow pump provided in an embodiment of the present application, Figure 2 yes Figure 1 The cross-sectional view of the constant flow pump at position AA, Figure 3 yes Figure 1 Left view of the constant flow pump in the figure, Figure 4 yes Figure 3 Cross-sectional view of the constant flow pump at position BB.

[0102] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The constant flow pump comprises: a pump body 1, a pump head assembly 2 and a cam drive assembly 3. Figure 2 and Figure 4The pump body 1 is provided with a liquid outlet 11, a first confluence channel 12 and a plurality of plunger cavities 13, and a first shunt channel 14 and a second shunt channel 15 are provided corresponding to each plunger cavity 13. One end of the first shunt channel 14 is connected to the plunger cavity 13, and the other end is connected to the first confluence channel 12. The liquid outlet 11 is connected to the first confluence channel 12, and one end of the second shunt channel 15 is connected to the plunger cavity 13, and the other end is used for liquid inlet. The first shunt channel 14 and the second shunt channel 15 are both unidirectional channels, and the flow direction of the liquid in the unidirectional channel is configured to flow from the second shunt channel 15 to the first shunt channel 14 (i.e. Figure 2 The pump head assembly 2 includes a plurality of plungers 21, and the plurality of plungers 21 correspond to the plurality of plunger cavities 13 one by one. The plungers 21 are sealed and arranged in the plunger cavities 13 so as to be reciprocatingly slidable.

[0103] See also Figure 4 , Figure 5 and Figure 6 The cam driving assembly 3 includes a transmission shaft 31, a driving member 32 and a plurality of cams 33. The transmission shaft 31 is rotatably disposed on the pump body 1. The plurality of cams 33 are all mounted on the transmission shaft 31 and correspond to the plurality of plungers 21 one by one. Each plunger 21 is slidably connected to the cam 33 along the circumferential direction F of the cam 33. The eccentric directions of at least two cams 33 relative to the transmission shaft 31 are different from each other. The driving member 32 is used to drive the transmission shaft 31 to rotate and drive the plunger 21 to slide back and forth in the plunger cavity 13, so as to draw liquid into the plunger cavity 13 through the second diversion channel 15 and inject liquid into the first confluence channel 12 through the first diversion channel 14.

[0104] In the embodiment of the present application, since the transmission shaft 31 is rotatably disposed on the pump body 1, the driving member 32 can drive the transmission shaft 31 to rotate. Since the cam 33 is mounted on the transmission shaft 31, when the transmission shaft 31 starts to rotate, the cam 33 can be synchronously driven to rotate. After the cam 33 starts to rotate, since the plunger 21 is sealed and reciprocatingly slidably disposed in the plunger cavity 13, and each plunger 21 is slidably connected to the cam 33 along the circumferential direction F of the cam 33, when the transmission shaft 31 starts to rotate, the plunger 21 can be driven to slide reciprocatingly in the plunger cavity 13.

[0105] Since the plunger 21 is sealed in the plunger cavity 13, when the plunger 21 slides back and forth in the plunger cavity 13, the air pressure in the suction space formed between the plunger 21 and the plunger cavity 13 can gradually increase or decrease, thereby achieving an effect similar to needle injection and suction.

[0106] On this basis, since one end of the second diverter channel 15 is connected to the plunger chamber 13 and the other end is used for liquid inlet, one end of the first diverter channel 14 is connected to the plunger chamber 13 and the other end is connected to the first confluence channel 12, and since the first diverter channel 14 and the second diverter channel 15 are both one-way channels, the flow direction of the liquid in the one-way channel is configured to flow from the second diverter channel 15 to the first diverter channel 14. Therefore, when the plunger 21 slides in the plunger chamber 13 along the first direction, so that the suction space formed between the plunger 21 and the plunger chamber 13 gradually increases, the air pressure in the suction space can be gradually reduced. In this way, the external liquid can enter the suction space through the second diverter channel 15, so that the constant current pump can achieve the purpose of pumping liquid through the plunger 21.

[0107] After the liquid enters the suction space, when the plunger 21 slides in the plunger cavity 13 along the second direction opposite to the first direction, so that the suction space is gradually reduced, the air pressure in the suction space can be gradually increased, so that the liquid in the suction space will enter the first confluence channel 12 through the first diversion channel 14, and the purpose of injecting liquid into the first confluence channel 12 through the plunger 21 is achieved. After the liquid enters the first confluence channel 12, since the liquid outlet 11 is connected to the first confluence channel 12, the liquid can be discharged from the constant flow pump through the liquid outlet 11. When the liquid outlet 11 is connected to the liquid-to-be-injected part, the constant flow pump can achieve the purpose of injecting liquid into the liquid-to-be-injected part.

[0108] Among them, since there are multiple plunger cavities 13, there are also multiple plungers 21 and they correspond one-to-one to the multiple plunger cavities 13, and since multiple cams 33 are installed on the transmission shaft 31 and correspond one-to-one to the multiple plungers 21, each plunger 21 is slidably connected to the cam 33 along the circumferential direction F of the cam 33. Therefore, when the driving member 32 drives the transmission shaft 31 to rotate, it can simultaneously drive multiple plungers 21 to slide back and forth in the corresponding plunger cavities 13, thereby greatly improving the efficiency of the constant flow pump in pumping and injecting liquid through the plunger 21.

[0109] In addition, since the eccentric directions of at least two cams 33 among the multiple cams 33 relative to the transmission shaft 31 are different, in layman's terms, the installation directions of at least two cams 33 among the multiple cams 33 on the transmission shaft 31 are different. Therefore, when the driving member 32 drives the transmission shaft 31 to rotate, drives the multiple cams 33 to rotate, and then synchronously drives the multiple plungers 21 to slide back and forth in the corresponding plunger chambers 13, the movement states of at least two plungers 21 among the multiple plungers 21 will be asynchronous, and a situation may occur where the first plunger among the at least two plungers 21 slides along the first direction while the second plunger among the at least two plungers 21 slides along the second direction.

[0110] In this way, the timing of injecting liquid into the first confluence channel 12 through the first plunger and the second plunger can be different, that is, the timing of injecting liquid into the first confluence channel 12 through at least two of the multiple plungers 21 can be different. In this way, compared with the method of injecting liquid into the first confluence channel 12 at the same time through multiple plungers 21, the constant current pump provided in the present application can make the flow rate of liquid injected into the first confluence channel 12 more uniform, and there will be no pulse injection phenomenon, thereby making the flow rate of liquid discharged outside the constant current pump through the liquid outlet 11 more uniform, so that the constant current pump can accurately measure the flow rate, and the injection accuracy is higher when injecting liquid into the part to be injected.

[0111] In addition, since the plunger 21 is slidably connected to the cam 33 along the circumferential direction F of the cam 33, when the cam 33 rotates following the transmission shaft 31, the purpose of driving the plunger 21 to slide back and forth in the plunger cavity 13 can be achieved. In other words, it is only necessary to make the plunger 21 slidably connected to the cam 33 along the circumferential direction F of the cam 33. As the cam 33 rotates, the purpose of driving the plunger 21 to slide back and forth in the plunger cavity 13 can be achieved. The implementation method is very simple, which can simplify the structure of the constant current pump to a certain extent and reduce the manufacturing cost of the constant current pump.

[0112] Furthermore, since the cam 33 is arranged on the transmission shaft 31, the rotation of the cam 33 is achieved by the rotation of the transmission shaft 31, and the resetting of the cam 33 is also achieved by the rotation of the transmission shaft 31. Compared with the method in the related art that the cam 33 needs to be reset by a spring after rotation, which requires frequent replacement of the spring, the method of the present application that drives the cam 33 to reset by the rotation of the transmission shaft 31 is more reliable, and there is no need for frequent replacement of parts, so that the maintenance cost of the constant current pump is lower and the user experience is better.

[0113] Among them, the flow direction of the liquid in the above-mentioned one-way channel is configured to flow from the second diversion channel 15 to the first diversion channel 14, which can be achieved in a variety of possible ways. In one possible implementation method, a one-way valve can be provided in the one-way channel, that is, a one-way valve is provided in both the second diversion channel 15 and the first diversion channel 14. Of course, it can also be achieved in other possible ways, which are not listed one by one in the embodiments of the present application.

[0114] It should be noted that the eccentric directions of at least two cams 33 among the above-mentioned multiple cams 33 relative to the transmission shaft 31 are different from each other, which can be understood as: the eccentric directions of each cam 33 among the multiple cams 33 relative to the transmission shaft 31 are different from each other, and can also be understood as: the eccentric directions of at least two cams 33 among the multiple cams 33 relative to the transmission shaft 31 are different from each other.

[0115] When the eccentric directions of each cam 33 in the plurality of cams 33 relative to the transmission shaft 31 are different from each other, the injection accuracy of the constant flow pump when injecting liquid into the part to be injected can be higher.

[0116] It should be noted that the above-mentioned part to be injected with liquid may be a battery. When the part to be injected with liquid is a battery, the above-mentioned liquid may be an electrolyte.

[0117] The number of the cams 33 can be two, three, or four, etc., which is not limited in the present embodiment. It is understandable that, since the number of the cams 33 is set corresponding to the number of the plungers 21, when the number of the cams 33 is two, three, or four, the number of the plungers 21 will also be two, three, or four, etc.

[0118] In some embodiments, see Figure 4 There are three cams 33 , and the eccentric directions of the three cams 33 relative to the transmission shaft 31 are different and differ by 120°.

[0119] When the number of cams 33 is three, the eccentric directions of the three cams 33 relative to the transmission shaft 31 are different and differ by 120°. Since 120° is exactly one-third of 360°, that is to say, the eccentric directions of the three cams 33 relative to the transmission shaft 31 are evenly arranged along the circumference. In this way, the timing of injecting liquid into the first confluence channel 12 by the three plungers 21 corresponding to the three cams 33 can be different and the interval time can be uniform. In this way, the flow rate of the liquid discharged from the constant flow pump through the liquid outlet 11 can be more uniform, so that the constant flow pump can measure the flow rate more accurately, and the injection accuracy when injecting liquid into the liquid-to-be-injected parts is also higher.

[0120] Of course, the number of the cams 33 may be other numbers, and the angle difference between the cams 33 and the eccentric directions of the transmission shaft 31 may be other values, which is not limited in the embodiment of the present application.

[0121] There are many ways to slidably connect the plunger 21 to the cam 33 along the circumferential direction F of the cam 33. In one possible implementation, see Figure 5 and Figure 6 The cam 33 is provided with a cam groove 331 which is arranged along the circumferential direction F of the cam 33 . The plunger 21 is slidably arranged in the cam groove 331 along the circumferential direction of the cam 33 , so that the plunger 21 is slidably connected to the cam 33 along the circumferential direction F of the cam 33 .

[0122] By providing a cam groove 331 on the cam 33 and allowing the plunger 21 to be slidably provided in the cam groove 331 along the circumferential direction of the cam groove 331, the purpose of slidably connecting the plunger 21 to the cam 33 along the circumferential direction F of the cam 33 can be achieved. The implementation method is very simple. Therefore, the complexity of slidably connecting the plunger 21 to the cam 33 along the circumferential direction F of the cam 33 can be reduced to a certain extent.

[0123] Of course, in another possible implementation, the purpose of the plunger 21 being slidably connected to the cam 33 along the circumferential direction F of the cam 33 can also be achieved in other ways. For example, an annular guide ridge can be provided on the peripheral wall of the cam 33 along the circumference of the cam 33, and a card groove can be provided on the plunger 21, and the card groove can be slidably connected to the annular guide ridge along the circumference of the annular guide ridge. In this way, the purpose of the plunger 21 being slidably connected to the cam 33 along the circumferential direction F of the cam 33 can also be achieved. That is to say, it is sufficient to achieve the purpose of the plunger 21 being slidably connected to the cam 33 along the circumferential direction F of the cam 33, and the embodiment of the present application is not limited to this.

[0124] When the plunger 21 is slidably connected to the cam 33 along the circumferential direction F of the cam 33 by providing a cam groove 331 on the cam 33, in a possible implementation, see Figure 6 The cam 33 has a first surface 332 and a second surface 333 that are disposed opposite to each other, and the cam groove 331 is disposed on the first surface 332. By disposing the cam groove 331 on the first surface 332, since the first surface 332 of the cam 33 is relatively regular and has a larger area, it is convenient to process the cam groove 331.

[0125] Of course, the cam groove 331 may also be disposed at other positions of the cam 33 . For example, the cam groove 331 may also be disposed on the peripheral wall of the cam 33 along the circumference of the cam 33 . The embodiment of the present application does not limit the position of the cam groove 331 on the cam 33 .

[0126] When the cam groove 331 is disposed on the first surface 332 of the cam 33, in order to avoid or reduce the lubricating oil in the cam groove 331 from dripping from the cam groove 331 to other parts of the constant current pump, thereby polluting other parts of the constant current pump or affecting the normal operation of other parts of the constant current pump, in some embodiments, see Figure 4 and Figure 6 The first surface 332 is arranged vertically upward, so that the lubricating oil in the cam groove 331 can be avoided or reduced from dripping from the cam groove 331 to other parts of the constant current pump, thereby avoiding contamination of other parts of the constant current pump or affecting the normal operation of other parts of the constant current pump, making the entire constant current pump cleaner and more reliable.

[0127] In order to make the plunger 21 slide more smoothly along the circumferential direction F of the cam 33 and avoid the situation where the friction force at the connection between the plunger 21 and the cam 33 is large, in some embodiments, see Figure 4 , Figure 7 and Figure 8 A first driven bearing 4 is rotatably provided on the plunger 21 , the axial direction of the first driven bearing 4 is parallel to the axial direction of the transmission shaft 31 , and the first driven bearing 4 is slidably provided in the cam groove 331 along the circumferential direction of the cam groove 331 .

[0128] By making the first driven bearing 4 slidably arranged in the cam groove 331 along the circumferential direction of the cam groove 331, since the axial direction of the first driven bearing 4 is parallel to the axial direction of the transmission shaft 31, when the plunger 21 slides along the circumferential direction F of the cam 33, relative rolling will occur between the first driven bearing 4 and the cam 33, so that the friction between the plunger 21 and the cam 33 is rolling friction. In this way, the friction force between the plunger 21 and the cam 33 can be greatly reduced, so that the plunger 21 can slide more smoothly along the circumferential direction F of the cam 33.

[0129] In order to avoid the first driven bearing 4 from getting stuck in the cam groove 331, in some embodiments, see Figure 8 The width of the cam groove 331 is greater than the diameter of the first driven bearing 4. By making the width of the cam groove 331 greater than the diameter of the first driven bearing 4, the first driven bearing 4 can be prevented from getting stuck in the cam groove 331, making the operation of the constant current pump more reliable.

[0130] When the width of the cam groove 331 is greater than the diameter of the first driven bearing 4, a gap may appear between the first driven bearing 4 and the groove wall of the cam groove 331, and the plunger 21 may shake when sliding along the circumferential direction F of the cam 33, resulting in poor motion accuracy. In order to improve the motion accuracy of the plunger 21 when sliding along the circumferential direction F of the cam 33, in some embodiments, see Figure 4 and Figure 6 A second driven bearing 5 is rotatably provided on the plunger 21 and is spaced apart from the first driven bearing 4. The axial direction of the second driven bearing 5 is parallel to the axial direction of the first driven bearing 4. A clamping ring portion 334 is formed between the cam groove 331 and the peripheral wall of the cam 33. The second driven bearing 5 and the first driven bearing 4 are respectively located on both sides of the clamping ring portion 334 and are respectively slidably abutted against the two side surfaces of the clamping ring portion 334. The distance between the two side surfaces of the clamping ring portion 334 is equal.

[0131] Since the axial direction of the second driven bearing 5 is parallel to the axial direction of the first driven bearing 4, and the second driven bearing 5 and the first driven bearing 4 are respectively located on both sides of the clamping ring portion 334 and are respectively slidably abutted against the two side surfaces of the clamping ring portion 334, that is to say, the clamping ring portion 334 is clamped between the second driven bearing 5 and the first driven bearing 4. In this way, the shaking of the plunger 21 when sliding along the circumferential direction F of the cam 33 can be avoided, thereby improving the movement accuracy.

[0132] It should be noted that the second driven bearing 5 and the first driven bearing 4 are respectively located on both sides of the clamping ring portion 334 and are respectively in sliding contact with the two side surfaces of the clamping ring portion 334. It can be understood that: the clamping ring portion 334 is clamped between the second driven bearing 5 and the first driven bearing 4, and the clamping ring portion 334 is subjected to a preload force from the second driven bearing 5 and / or the first driven bearing 4.

[0133] In some embodiments, see Figure 7 A plunger connecting rod 6 is also provided on the plunger 21 , and the first driven bearing 4 and the second driven bearing 5 are both rotatably provided on the plunger connecting rod 6 .

[0134] By making the first driven bearing 4 and the second driven bearing 5 both rotatably disposed on the plunger connecting rod 6 , it is possible to avoid the situation where the first driven bearing 4 and the second driven bearing 5 are both directly disposed on the plunger 21 , which affects the accuracy of the plunger 21 .

[0135] The plunger 21 and the plunger connecting rod 6 may be an integrated structure or a split structure, which is not limited in the embodiment of the present application.

[0136] In order to prevent the plunger 21 from rotating when sliding back and forth, in some embodiments, see Fig. 9 and Fig.10 A guide rod 61 is provided on the plunger connecting rod 6, and a guide hole (not shown in the figure) is provided on the pump body 1 corresponding to the guide rod 61. The guide rod 61 is reciprocatingly slidable in the guide hole along the axial direction of the guide hole, and the axial direction of the guide hole is parallel to the sliding direction of the plunger 21.

[0137] Since the axial direction of the guide hole is parallel to the sliding direction of the plunger 21, the guide rod 61 is arranged in the guide hole so as to be reciprocatingly slidable along the axial direction of the guide hole. Therefore, by setting the guide rod 61, the guide rod 61 can guide the reciprocating sliding of the plunger 21, so that the plunger 21 will not rotate around the axial direction of the plunger 21 when it slides reciprocatingly.

[0138] In order to better prevent the plunger 21 from rotating, in some embodiments, see Fig.10, the number of the guide rods 61 is greater than or equal to two. By making the number of the guide rods 61 greater than or equal to two, on the one hand, it can better prevent the plunger 21 from rotating, and on the other hand, it can make the plunger 21 more stable when sliding back and forth.

[0139] It should be noted that the number of guide rods 61 may be 2, 3, 4, etc., which is not limited in the embodiment of the present application.

[0140] Of course, in other embodiments, the number of the guide rod 61 may also be 1, and the embodiment of the present application does not limit the number of the guide rod 61.

[0141] When the number of the guide rods 61 is two, in some embodiments, see Fig.10 , the guide rods 61 can be respectively located along the sliding direction of the plunger connecting rod 6 perpendicular to the sliding direction of the plunger 21 ( Fig.10 On both sides of the center X-axis direction), this can, on the one hand, better prevent the piston 21 from rotating, and on the other hand, make the piston 21 more stable when sliding back and forth.

[0142] There are many ways to implement the second driven bearing 5 and the first driven bearing 4 to slide against the two side surfaces of the clamping ring portion 334. In the first possible implementation, see Figure 7 The plunger connecting rod 6 has a deformation portion 62, and the first driven bearing 4 and the second driven bearing 5 are respectively located on both sides of the deformation portion 62. The deformation portion 62 is used to provide abutment force between the first driven bearing 4 and the second driven bearing 5 after deformation, so that the second driven bearing 5 and the first driven bearing 4 are respectively slidably abutted against the two side surfaces of the clamping ring portion 334.

[0143] In this embodiment, before the clamping ring 334 is clamped between the first driven bearing 4 and the second driven bearing 5, the distance between the first driven bearing 4 and the second driven bearing 5 can be made slightly smaller than the distance between the two side surfaces of the clamping ring 334. In this way, when the clamping ring 334 is clamped between the first driven bearing 4 and the second driven bearing 5, the first driven bearing 4 and the second driven bearing 5 can be bent under the action of external force. Since the first driven bearing 4 and the second driven bearing 5 are respectively located on both sides of the deformation portion 62, when the first driven bearing 4 and the second driven bearing 5 are bent, the deformation portion 62 can be deformed, and then the distance between the first driven bearing 4 and the second driven bearing 5 gradually increases until it is slightly larger than the distance between the two side surfaces of the clamping ring 334. Then, the clamping ring 334 can be located between the first driven bearing 4 and the second driven bearing 5.

[0144] After the clamping ring 334 is located between the first driven bearing 4 and the second driven bearing 5, the first driven bearing 4 and the second driven bearing 5 can be stopped from being bent, so that the deformation portion 62 can provide the first driven bearing 4 and the second driven bearing 5 with abutment against each other when resetting after deformation, thereby achieving the purpose of making the first driven bearing 4 and the second driven bearing 5 slide against the two side surfaces of the clamping ring 334 respectively. The method of making the second driven bearing 5 and the first driven bearing 4 slide against the two side surfaces of the clamping ring 334 respectively is very simple, which can simplify the structure of the constant current pump to a certain extent and reduce the cost of the constant current pump.

[0145] There are many ways to implement the above-mentioned deformation portion 62. In one possible implementation, see Fig.11 and Fig.12 The deformation part 62 includes: an extension part 621 and a deformation hole 622. The first driven bearing 4 and the second driven bearing 5 are both arranged on the extension part 621. The deformation hole 622 is arranged on the extension part 621 and is located between the first driven bearing 4 and the second driven bearing 5. After the extension part 621 is deformed at the position where the deformation hole 622 is located, it provides the first driven bearing 4 and the second driven bearing 5 with abutting force facing each other.

[0146] By providing a deformation hole 622 in the protruding portion 621, the position where the deformation hole 622 is located can be easily deformed. When the protruding portion 621 is deformed at the position where the deformation hole 622 is located, abutment force can be provided between the first driven bearing 4 and the second driven bearing 5, making the structure of the deformation portion 62 very simple.

[0147] Of course, the deformation portion 62 may also be other possible structures, as long as it can provide the first driven bearing 4 and the second driven bearing 5 with an abutting force towards each other after deformation. The embodiment of the present application does not limit the deformation portion 62.

[0148] In some embodiments, see Fig.11 and Fig.12 The deformable hole 622 includes: a strip hole and / or a U-shaped hole. By making the deformable hole 622 include a strip hole and / or a U-shaped hole, since the strip hole and / or the U-shaped hole are easy to process, the manufacturing cost of the deformable hole 622 can be reduced to a certain extent.

[0149] Among them, the number of the above-mentioned strip holes and U-shaped holes can be any number, and the arrangement position can also be any position, as long as they can provide the first driven bearing 4 and the second driven bearing 5 with abutment force towards each other after deformation. The embodiment of the present application does not limit this.

[0150] Specifically, when the deformed hole 622 includes: a strip hole and / or a U-shaped hole, continue to refer to Fig.11 and Fig.12The strip holes include a plurality of first strip holes 6221, and the U-shaped holes include a plurality of first U-shaped holes 6222 and a plurality of second U-shaped holes 6223. Each of the first strip holes 6221 is along the extension direction of the transmission shaft 31 ( Fig.11 The first strip holes 6221 extend along the first driven bearing 4 and point to the second driven bearing 5 (in the Z-axis direction). Fig.12 The plurality of first U-shaped holes 6222 are arranged in an array at intervals along the direction in which the transmission shaft 31 extends (in the Y-axis direction). Each first U-shaped hole 6222 penetrates the extension portion 621 along the extension direction of the transmission shaft 31 and is located between two adjacent first bar-shaped holes 6221. The plurality of first U-shaped holes 6222 are arranged in an array at intervals along the direction in which the first driven bearing 4 points to the second driven bearing 5. The plurality of second U-shaped holes 6223 are arranged symmetrically with respect to the mirror plane S and the plurality of first U-shaped holes 6222. The mirror plane S is coplanar with the direction in which the first driven bearing 4 points to the second driven bearing 5 and is parallel to the extension direction of the transmission shaft 31.

[0151] By making each first strip hole 6221 pass through the protruding portion 621 along the extension direction of the transmission shaft 31, multiple first strip holes 6221 are arranged in an array at intervals along the direction from the first driven bearing 4 to the second driven bearing 5, and each first U-shaped hole 6222 passes through the protruding portion 621 along the extension direction of the transmission shaft 31 and is located between two adjacent first strip holes 6221, multiple first U-shaped holes 6222 are arranged in an array at intervals along the direction from the first driven bearing 4 to the second driven bearing 5, and multiple second U-shaped holes 6223 are symmetrically arranged with respect to the mirror plane S and the multiple first U-shaped holes 6222, the layout of the first strip holes 6221, the first U-shaped holes 6222 and the second U-shaped holes 6223 on the protruding portion 621 can be made more regular, so that the deformation degree of each position of the protruding portion 621 can be made more uniform during deformation, and local fracture is less likely to occur.

[0152] The shape of the deformation holes 622 may be other possible shapes, and the number may be other possible numbers, as long as the deformation portion 62 can achieve the purpose of deformation. The embodiment of the present application does not limit the shape and number of the deformation holes 622.

[0153] There are many ways to implement the second driven bearing 5 and the first driven bearing 4 to slide against the two side surfaces of the clamping ring portion 334. In the second possible implementation, see Fig.13 and Fig.14The first driven bearing 4 and / or the second driven bearing 5 are rotatably arranged on the plunger 21 through the mounting shaft 7 respectively. The mounting shaft 7 has a weak portion 71. After the mounting shaft 7 is deformed at the weak portion 71, it provides an abutment force for at least one of the first driven bearing 4 and the second driven bearing 5 toward the other driven bearing, so that the first driven bearing 4 and the second driven bearing 5 are respectively slidably abutted against the two side surfaces of the clamping ring portion 334.

[0154] Since the first driven bearing 4 and / or the second driven bearing 5 are rotatably arranged on the plunger 21 through the mounting shaft 7 respectively, and the mounting shaft 7 has a weak portion 71, deformation can occur at the weak portion 71. When the mounting shaft 7 is deformed at the weak portion 71, an abutment force can be provided for at least one of the first driven bearing 4 and the second driven bearing 5 to be directed toward the other driven bearing, so that the clamping ring portion 334 is clamped between the first driven bearing 4 and the second driven bearing 5, thereby achieving the purpose of making the first driven bearing 4 and the second driven bearing 5 slide and abut against the two side surfaces of the clamping ring portion 334 respectively.

[0155] It can be seen that it is only necessary to set a weak portion 71 on the mounting shaft 7 to achieve the purpose of making the first driven bearing 4 and the second driven bearing 5 slide and abut against the two side surfaces of the clamping ring portion 334 respectively. In other words, it is only necessary to slightly modify the mounting shaft 7 to achieve the purpose of making the first driven bearing 4 and the second driven bearing 5 slide and abut against the two side surfaces of the clamping ring portion 334 respectively. The implementation method is very simple and low-cost.

[0156] Among them, the above-mentioned mounting shaft 7 provides an abutment force for at least one of the first driven bearing 4 and the second driven bearing 5 toward the other driven bearing after being deformed at the weak portion 71, and there are three possible implementation methods. In a first possible implementation method, the first driven bearing 4 is rotatably arranged on the plunger 21 through the mounting shaft 7. In this implementation method, the mounting shaft 7 provides an abutment force for the first driven bearing 4 toward the second driven bearing 5 after being deformed at the weak portion 71.

[0157] In a second possible implementation, the second driven bearing 5 is rotatably disposed on the plunger 21 via the mounting shaft 7 . In this implementation, the mounting shaft 7 provides an abutment force for the second driven bearing 5 toward the first driven bearing 4 after deformation at the weak portion 71 .

[0158] In a third possible implementation, the first driven bearing 4 is rotatably disposed on the plunger 21 through the mounting shaft 7, and the second driven bearing 5 is also rotatably disposed on the plunger 21 through the mounting shaft 7. That is, the first driven bearing 4 and the second driven bearing 5 are rotatably disposed on the plunger 21 through the mounting shaft 7, respectively. In this way, the mounting shaft 7 can provide abutment force between the first driven bearing 4 and the second driven bearing 5 after deformation at the weak portion 71.

[0159] There are many ways to form the weak portion 71. In one possible implementation, see Fig.14 A U-shaped recessed groove is provided along the circumference of the installation shaft 7 , and a weak portion 71 is formed at the installation shaft 7 where the U-shaped recessed groove is located.

[0160] By arranging a U-shaped recessed groove along the circumference of the mounting shaft 7 , the position where the U-shaped recessed groove is arranged on the mounting shaft 7 can be made weaker than other positions, thereby forming a weak portion 71 , and the mounting shaft 7 can be easily deformed at the weak portion 71 .

[0161] The method of forming the weak portion 71 by providing a U-shaped recessed groove along the circumference of the installation shaft 7 is relatively simple and can reduce the cost of the installation shaft 7 .

[0162] Of course, the weak portion 71 may also be formed in other possible ways, for example, by providing a recessed groove of other shapes along the circumference of the mounting shaft 7 , and the embodiment of the present application is not limited to this.

[0163] There are many ways to implement the second driven bearing 5 and the first driven bearing 4 to slide against the two side surfaces of the clamping ring portion 334. In the third possible implementation, see Fig. 9 and Fig.10 , the plunger 21 is directed along the first driven bearing 4 to the second driven bearing 5 ( Fig. 9 A first sliding block 8 is movably provided on the first driven bearing 4 in the Y-axis direction, and a first elastic member 81 is provided between the first sliding block 8 and the plunger 21. The first elastic member 81 provides the first sliding block 8 with a direction from the first driven bearing 4 to the second driven bearing 5 ( Fig. 9 The elastic force of the negative direction of the Y axis is applied to make the first driven bearing 4 and the second driven bearing 5 slide against the two side surfaces of the clamping ring portion 334 respectively.

[0164] Since the first sliding block 8 is movably arranged on the plunger 21 along the direction from the first driven bearing 4 to the second driven bearing 5, the first driven bearing 4 is rotatably arranged on the first sliding block 8, and since the first elastic member 81 is arranged between the first sliding block 8 and the plunger 21, the first elastic member 81 can provide the first sliding block 8 with elastic force pointing from the first driven bearing 4 to the second driven bearing 5, thereby driving the first driven bearing 4 to slide toward the second driven bearing 5, thereby achieving the purpose of making the first driven bearing 4 and the second driven bearing 5 slide and abut against the two side surfaces of the clamping ring portion 334 respectively.

[0165] It can be seen that by driving the first driven bearing 4 to slide toward the second driven bearing 5 through the first elastic member 81, the purpose of making the first driven bearing 4 and the second driven bearing 5 slide and abut against the two side surfaces of the clamping ring portion 334 can be achieved. The implementation principle is very simple. In addition, since the elastic force of the first elastic member 81 can be selected in a large range and can be quantified, the abutment force of the first driven bearing 4 and the second driven bearing 5 sliding and abutting against the two side surfaces of the clamping ring portion 334 can be easily controlled, which is more precise and more flexible.

[0166] In some embodiments, a second sliding block is movably provided on the plunger 21 along a direction from the first driven bearing 4 to the second driven bearing 5, the second driven bearing 5 is rotatably provided on the second sliding block, and a second elastic member is provided between the second sliding block and the plunger 21, the second elastic member provides elastic force for the second sliding block along the second driven bearing 5 to point to the first driven bearing 4, so that the first driven bearing 4 and the second driven bearing 5 are respectively slidably abutted against the two side surfaces of the clamping ring portion 334.

[0167] In this implementation, the principle of making the first driven bearing 4 and the second driven bearing 5 slide and abut against the two side surfaces of the clamping ring portion 334 respectively is similar to the principle of making the second driven bearing 5 and the first driven bearing 4 slide and abut against the two side surfaces of the clamping ring portion 334 respectively when the first driven bearing 4 is rotatably arranged on the first sliding block 8 as mentioned above. For details, please refer to the description of the above embodiment, and the embodiments of the present application will not be repeated here.

[0168] The above-mentioned first elastic member 81 and / or second elastic member can be a disc spring, or can be other possible elastic members, for example, can also be a coil spring, etc. The embodiment of the present application does not limit the first elastic member 81 and / or the second elastic member.

[0169] When the first elastic member 81 and / or the second elastic member is a disc spring, since the disc spring has the advantages of high rigidity and strong buffering and vibration absorbing ability, the constant current pump can be made to run more smoothly.

[0170] It should be noted that, when there are multiple plungers 21, the second driven bearings 5 ​​and the first driven bearings 4 corresponding to the multiple plungers 21 can respectively achieve sliding abutment with the two side surfaces of the corresponding clamping ring portion 334 in any one of the above three implementation methods, or any combination of two, or any combination of three, and the embodiment of the present application is not limited to this.

[0171] In some embodiments, see Figure 2The pump body 1 includes: a body 16 and a first manifold block 17. A plurality of plunger chambers 13, a first flow dividing channel 14 and a second flow dividing channel 15 are all arranged in the body 16. The first manifold block 17 is arranged in the body 16, the first flow dividing channel 12 is arranged in the first manifold block 17, and the liquid outlet 11 is arranged in the first manifold block 17.

[0172] By arranging the first confluence channel 12 and the liquid outlet 11 on the first confluence block 17, multiple plunger cavities 13, the first diversion channel 14 and the second diversion channel 15 are all arranged on the main body 16, which can facilitate the processing of the first diversion channel 14 and the second diversion channel 15 in the main body 16, reduce the processing difficulty of the first diversion channel 14 and the second diversion channel 15, and thus reduce the cost of the pump body 1.

[0173] In some embodiments, see Figure 2 The pump body 1 also includes: a second confluence block 18, which is arranged on the main body 16, and the second confluence block 18 is provided with a second confluence channel 181 and a liquid inlet 182, the other end of the second branch channel 15 is connected to the second confluence channel 181, and the second confluence channel 181 is connected to the liquid inlet 182.

[0174] Since the second confluence channel 181 is connected to the liquid inlet 182, the liquid entering through the liquid inlet 182 can first enter the second confluence channel 181. Then, since the other end of the second branch channel 15 is connected to the second confluence channel 181, the liquid in the second confluence channel 181 can continue to enter the plunger cavity 13 through the second branch channel 15.

[0175] By setting a second confluence block 18 and making the second confluence block 18 set on the main body 16, the second confluence block 18 is provided with a second confluence channel 181 and a liquid inlet 182, the other end of the second diversion channel 15 is connected to the second confluence channel 181, and the second confluence channel 181 is connected to the liquid inlet 182, so that liquid can be introduced through the same liquid inlet 182, which is very convenient.

[0176] In some embodiments, see Figure 2 , the extension direction of the transmission shaft 31 is the vertical direction, and the sliding direction of the plunger 21 is the horizontal direction.

[0177] By making the extension direction of the transmission shaft 31 vertical and the sliding direction of the plunger 21 horizontal, the entire structure of the constant flow pump can be made more regular and easy to install.

[0178] Of course, the extension direction of the transmission shaft 31 may also be other possible directions, and the sliding direction of the plunger 21 may also be other possible directions, which is not limited in the embodiment of the present application.

[0179] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A constant current pump, characterized in that: The constant flow pump comprises: A pump body (1), the pump body (1) being provided with a liquid outlet (11), a first converging channel (12) and a plurality of plunger cavities (13), each of the plunger cavities (13) being provided with a first shunt channel (14) and a second shunt channel (15), one end of the first shunt channel (14) being in communication with the plunger cavity (13) and the other end being in communication with the first converging channel (12), the liquid outlet (11) being in communication with the first converging channel (12), one end of the second shunt channel (15) being in communication with the plunger cavity (13) and the other end being used for liquid inlet, the first shunt channel (14) and the second shunt channel (15) being both unidirectional channels, the flow direction of the liquid in the unidirectional channels being configured to flow from the second shunt channel (15) to the first shunt channel (14); A pump head assembly (2), the pump head assembly (2) comprising a plurality of plungers (21), the plurality of plungers (21) corresponding one to one with the plurality of plunger cavities (13), the plungers (21) being sealably disposed in the plunger cavities (13) in a reciprocatingly slidable manner; A cam driving assembly (3), the cam driving assembly (3) comprising a transmission shaft (31), a driving member (32) and a plurality of cams (33), the transmission shaft (31) being rotatably arranged on the pump body (1), the plurality of cams (33) being mounted on the transmission shaft (31) and corresponding one-to-one to the plurality of plungers (21), each of the plungers (21) being slidably connected to the cam (33) along the circumference of the cam (33), at least two of the plurality of cams (33) having eccentric directions different from each other relative to the transmission shaft (31), the driving member (32) being used to drive the transmission shaft (31). 1) rotates and drives the plunger (21) to slide back and forth in the plunger cavity (13), so as to draw the liquid into the plunger cavity (13) through the second flow dividing channel (15), and to inject the liquid into the first flow converging channel (12) through the first flow dividing channel (14); the cam (33) is provided with a cam groove (331), the cam groove (331) is arranged along the circumference of the cam (33), and the plunger (21) is slidably arranged in the cam groove (331) along the circumference of the cam groove (331), so that the plunger (21) is slidably connected to the cam (33) along the circumference of the cam (33). 33); a first driven bearing (4) is rotatably provided on the plunger (21), and the first driven bearing (4) is slidably provided in the cam groove (331) along the circumferential direction of the cam groove (331); a second driven bearing (5) is also rotatably provided on the plunger (21) and is spaced apart from the first driven bearing (4), a clamping ring portion (334) is formed between the cam groove (331) and the peripheral wall of the cam (33), and the second driven bearing (5) and the first driven bearing (4) are respectively located on both sides of the clamping ring portion (334) and slide with the two side surfaces of the clamping ring portion (334) respectively. abutment; a plunger connecting rod (6) is also provided on the plunger (21), and the first driven bearing (4) and the second driven bearing (5) are both rotatably provided on the plunger connecting rod (6); the plunger connecting rod (6) has a deformation portion (62), and the first driven bearing (4) and the second driven bearing (5) are respectively located on both sides of the deformation portion (62), and the deformation portion (62) is used to provide the first driven bearing (4) and the second driven bearing (5) with an abutment force towards each other after deformation, so that the second driven bearing (5) and the first driven bearing (4) are respectively slidably abutted against the two side surfaces of the clamping ring portion (334).

2. The constant current pump according to claim 1, characterized in that: The cam (33) has a first surface (332) and a second surface (333) which are arranged opposite to each other, and the cam groove (331) is arranged on the first surface (332).

3. The constant flow pump according to claim 2, characterized in that: The first surface (332) is arranged vertically upward.

4. The constant current pump according to claim 1, characterized in that: The axial direction of the first driven bearing (4) is parallel to the axial direction of the transmission shaft (31).

5. The constant flow pump according to claim 1, characterized in that: The groove width of the cam groove (331) is greater than the diameter of the first driven bearing (4).

6. The constant flow pump according to claim 1, characterized in that: The axial direction of the second driven bearing (5) is parallel to the axial direction of the first driven bearing (4), and the distance between the two side surfaces of the clamping ring portion (334) is equal.

7. The constant flow pump according to claim 1, characterized in that: A guide rod (61) is provided on the plunger connecting rod (6), and a guide hole is provided on the pump body (1) corresponding to the guide rod (61). The guide rod (61) is reciprocatingly slidably arranged in the guide hole along the axial direction of the guide hole, and the axial direction of the guide hole is parallel to the sliding direction of the plunger (21).

8. The constant flow pump according to claim 7, characterized in that: The number of the guide rods (61) is greater than or equal to two.

9. The constant flow pump according to claim 1, characterized in that: The deformation portion (62) comprises: An extension portion (621), wherein the first driven bearing (4) and the second driven bearing (5) are both arranged on the extension portion (621); A deformation hole (622), wherein the deformation hole (622) is arranged on the protruding portion (621) and is located between the first driven bearing (4) and the second driven bearing (5); after the protruding portion (621) is deformed at the position where the deformation hole (622) is located, it provides a contact force between the first driven bearing (4) and the second driven bearing (5) facing each other.

10. The constant flow pump according to claim 9, characterized in that: The deformation hole (622) includes: a strip-shaped hole and / or a U-shaped hole.

11. The constant flow pump according to claim 10, characterized in that: The strip-shaped holes include a plurality of first strip-shaped holes (6221), each of the first strip-shaped holes (6221) passes through the protruding portion (621) along the extension direction of the transmission shaft (31), and the plurality of first strip-shaped holes (6221) are arranged in an array in a spaced relationship along a direction from the first driven bearing (4) to the second driven bearing (5); The U-shaped hole comprises a plurality of first U-shaped holes (6222) and a plurality of second U-shaped holes (6223), each of the first U-shaped holes (6222) passes through the protruding portion (621) along the extension direction of the transmission shaft (31) and is located between two adjacent first strip holes (6221), the plurality of first U-shaped holes (6222) are arranged in an array in a spaced relationship along the direction from the first driven bearing (4) to the second driven bearing (5), the plurality of second U-shaped holes (6223) are symmetrically arranged relative to a mirror plane (S) and the plurality of first U-shaped holes (6222), the mirror plane (S) being coplanar with the direction from the first driven bearing (4) to the second driven bearing (5) and being parallel to the extension direction of the transmission shaft (31).

12. The constant flow pump according to any one of claims 1 to 11, characterized in that: The first driven bearing (4) and / or the second driven bearing (5) are rotatably arranged on the plunger (21) respectively through a mounting shaft (7), and the mounting shaft (7) has a weak portion (71). After the mounting shaft (7) is deformed at the weak portion (71), it provides an abutment force for at least one of the first driven bearing (4) and the second driven bearing (5) toward the other driven bearing, so that the first driven bearing (4) and the second driven bearing (5) are respectively slidably abutted against the two side surfaces of the clamping ring portion (334).

13. The constant flow pump according to claim 12, characterized in that: A U-shaped recessed groove is provided along the circumference of the installation shaft (7), and the weak portion (71) is formed at the installation shaft (7) where the U-shaped recessed groove is located.

14. The constant flow pump according to any one of claims 1 to 11, characterized in that: A first sliding block (8) is movably arranged on the plunger (21) along a direction from the first driven bearing (4) to the second driven bearing (5); the first driven bearing (4) is rotatably arranged on the first sliding block (8); a first elastic member (81) is arranged between the first sliding block (8) and the plunger (21); the first elastic member (81) provides elastic force for the first sliding block (8) to point along the first driven bearing (4) to the second driven bearing (5), so that the first driven bearing (4) and the second driven bearing (5) are respectively slidably abutted against two side surfaces of the clamping ring portion (334); and / or, A second sliding block is movably arranged on the plunger (21) in a direction from the first driven bearing (4) to the second driven bearing (5); the second driven bearing (5) is rotatably arranged on the second sliding block; a second elastic member is arranged between the second sliding block and the plunger (21); the second elastic member provides elastic force for the second sliding block to point from the second driven bearing (5) to the first driven bearing (4), so that the first driven bearing (4) and the second driven bearing (5) are respectively slidably abutted against the two side surfaces of the clamping ring portion (334).

15. The constant flow pump according to claim 14, characterized in that: The first elastic member (81) and / or the second elastic member is a disc spring.

16. The constant flow pump according to any one of claims 1 to 11, characterized in that: The pump body (1) comprises: A body (16), wherein the plurality of plunger cavities (13), the first flow dividing channel (14) and the second flow dividing channel (15) are all arranged on the body (16); A first confluence block (17), wherein the first confluence block (17) is arranged on the body (16), the first confluence channel (12) is arranged on the first confluence block (17), and the liquid outlet (11) is arranged on the first confluence block (17).

17. The constant flow pump according to claim 16, characterized in that: The pump body (1) further comprises: A second confluence block (18), wherein the second confluence block (18) is arranged on the body (16), the second confluence block (18) is provided with a second confluence channel (181) and a liquid inlet (182), the other end of the second branch channel (15) is connected to the second confluence channel (181), and the second confluence channel (181) is connected to the liquid inlet (182).

18. The constant flow pump according to any one of claims 1 to 11, characterized in that: The extension direction of the transmission shaft (31) is a vertical direction, and the sliding direction of the plunger (21) is a horizontal direction.

19. The constant flow pump according to any one of claims 1 to 11, characterized in that: The number of the cams (33) is three, and the eccentric directions of the three cams (33) relative to the transmission shaft (31) are different from each other and differ by 120°.

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