A constant flow metering pump

Abstract

The utility model discloses a constant -current metering pump, including cam box, pump head and the confluence block, be equipped with drive mechanism, cam mechanism and at least two connecting rod mechanisms in the cam box, the output of drive mechanism drives the rotation of cam mechanism, makes all connecting rod mechanism with phase difference reciprocating motion driven by cam mechanism, the pump head is equipped with the chamber corresponding with connecting rod mechanism one to one, the chamber slip connection has the piston, the piston is connected with connecting rod mechanism, when drive mechanism drives the rotation of cam mechanism one round, the piston alternately carries out liquid absorption and liquid discharge, the confluence block is equipped with liquid inlet channel and liquid outlet channel, all chamber is linked together with liquid inlet channel and is equipped with liquid inlet check valve respectively, all chamber is linked together with liquid outlet channel and is equipped with liquid outlet check valve respectively. The utility model can solve the technical problem of the existing technology in the filling pulse phenomenon and the low filling efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of filling equipment technology, and specifically relates to a constant flow metering pump. Background Technology

[0002] In industries such as batteries, cosmetics, food, electronic products, and biological reagents, products require the use of precision metering pumps for liquid dispensing, filling, and other production processes.

[0003] However, existing precision injection pumps produce pulsation during filling. When filling large volumes, multiple liquid dispensing measurements are required. If the filling speed is too fast, it will cause serious liquid splashing; if the filling speed is too slow, it will affect the filling efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a constant flow metering pump to solve the technical problems of pulsation during filling and low filling efficiency in the prior art.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0006] This utility model discloses a constant flow metering pump, comprising:

[0007] A cam box, wherein a drive mechanism, a cam mechanism and at least two linkage mechanisms are provided inside the cam box; the output end of the drive mechanism drives the cam mechanism to rotate, so that the cam mechanism drives all the linkage mechanisms to reciprocate with a phase difference.

[0008] The pump head is provided with chambers corresponding to the linkage mechanism. A piston is slidably connected to each chamber. The piston is connected to the linkage mechanism. When the drive mechanism drives the cam mechanism to rotate one revolution, the piston alternately performs liquid suction and liquid discharge.

[0009] The manifold has an inlet channel and an outlet channel. All chambers are connected to the inlet channel and are each equipped with an inlet check valve. All chambers are connected to the outlet channel and are each equipped with an outlet check valve.

[0010] The present invention has at least the following beneficial effects: the drive mechanism drives the cam mechanism to rotate, which in turn drives multiple linkage mechanisms to reciprocate. These linkage mechanisms are connected to the piston, causing the piston to reciprocate relative to the chamber, thereby changing the volume between the chamber and the piston. The pressure generated by this volume change forces the chamber to alternately draw in and discharge liquid. Because the multiple linkage mechanisms reciprocate with a phase difference, as the cam mechanism rotates, the multiple pistons inside the pump head also reciprocate with a phase difference. The pump head outputs the same volume of liquid per unit time, achieving a constant flow rate. Furthermore, the alternating piston movement effectively prevents pulsation, ensuring filling speed while avoiding liquid splashing.

[0011] The manifold has an inlet channel and an outlet channel. All chambers within the pump head are connected to the inlet channel and equipped with inlet check valves. Therefore, when the piston moves relative to the chamber to draw in liquid, the liquid enters the chamber through the inlet channel via the inlet check valves. Similarly, all chambers within the pump head are connected to the outlet channel and equipped with outlet check valves. Therefore, when the piston moves relative to the chamber to discharge liquid, the liquid exits through the outlet channel via the outlet check valves, and then flows along the outlet channel for filling. The inlet and outlet check valves ensure that the pump head's suction and discharge are relatively independent and do not interfere with each other, guaranteeing filling accuracy.

[0012] As a further improvement to the above technical solution, the cam mechanism includes a camshaft and multiple cams. The output end of the drive mechanism is connected to the camshaft for transmission. The cams correspond one-to-one with the linkage mechanism, and the multiple cams are connected to the camshaft at a phase angle.

[0013] As a further improvement to the above technical solution, the cam is provided with a cam groove that is eccentrically disposed with respect to the cam shaft, and the linkage mechanism is connected to a follower, which is slidably connected within the cam groove.

[0014] As a further improvement to the above technical solution, the piston's liquid intake time is shorter than its liquid discharge time.

[0015] As a further improvement to the above technical solution, the pump head includes two chambers. When the cam mechanism rotates and drives one of the pistons to gradually change from a uniform discharge state to a decelerated discharge state, the other piston changes from a suction state to a discharge state with increased speed.

[0016] As a further improvement to the above technical solution, the pump head is provided with at least two pump heads arranged at intervals along a first direction, and the plurality of pistons arranged along the first direction are connected to the same linkage mechanism, wherein the first direction is perpendicular to the movement direction of the linkage mechanism.

[0017] As a further improvement to the above technical solution, the linkage mechanism includes a connecting member and a sliding member. The connecting member extends along a first direction, one end of the connecting member is rotatably connected to the driven member, and the other end of the connecting member is connected to a plurality of the sliding members. The plurality of sliding members are respectively connected to a plurality of pistons arranged along the first direction.

[0018] As a further improvement to the above technical solution, the cam box is provided with guide members on its two inner sides along the first direction, and the two ends of the connecting member along the first direction are slidably connected to the two guide members respectively.

[0019] As a further improvement to the above technical solution, the liquid inlet channel and the liquid outlet channel extend along the laying direction of the plurality of linkage mechanisms, the manifold corresponds one-to-one with the pump head, and the side of the manifold away from the pump head is provided with a liquid inlet connector and a liquid outlet connector, the liquid inlet connector is connected to the liquid inlet channel, and the liquid outlet connector is connected to the liquid outlet channel.

[0020] As a further improvement to the above technical solution, the drive mechanism includes a motor, a reducer, and a coupling. The output end of the motor is connected to the reducer, and the reducer and the camshaft are connected through the coupling. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0022] Figure 1 This is a schematic diagram of the overall structure of the constant flow metering pump provided in this embodiment of the utility model;

[0023] Figure 2 This is a front view of the constant flow metering pump provided in this embodiment of the utility model;

[0024] Figure 3 yes Figure 2 A sectional view of AA;

[0025] Figure 4 yes Figure 3 A cross-sectional view of BB;

[0026] Figure 5 This is a graph showing the piston speed of the constant flow metering pump provided in this embodiment of the invention as a function of angle.

[0027] The following labels are shown in the attached diagram:

[0028] 100. Constant flow metering pump;

[0029] 200. Cam box; 210. Guide component; 220. Support leg; 230. Handle;

[0030] 300, Pump head; 310, Chamber; 320, Piston; 321, Sealing ring; 330, Inlet check valve; 340, Outlet check valve;

[0031] 400. Manifold; 410. Inlet channel; 420. Outlet channel; 430. Inlet connector; 440. Outlet connector;

[0032] 500. Drive mechanism; 510. Motor; 520. Reducer; 530. Coupling;

[0033] 610. Camshaft; 620. Cam; 621. Cam groove; 630. Follower;

[0034] 710. Connecting parts; 711. Bearings; 720. Sliding parts. Detailed Implementation

[0035] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0038] It should be noted that in the attached diagram, the X direction points from the rear to the front of the constant flow metering pump; the Y direction points from the right side to the left side of the constant flow metering pump; and the Z direction points from the bottom to the top of the constant flow metering pump.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] Reference Figures 1 to 5 The following are several embodiments of the constant flow metering pump of this utility model.

[0041] like Figures 1 to 5 As shown, the constant flow metering pump 100 of this embodiment includes a cam box 200, a pump head 300, and a manifold 400. Specifically, the cam box 200 is connected to the pump head 300 to drive the pump head 300 to perform liquid intake and discharge; the end of the pump head 300 away from the cam box 200 is connected to the manifold 400, which provides stable liquid intake and discharge for the pump head 300.

[0042] In this embodiment, the cam box 200 includes a drive mechanism 500, a cam mechanism, and a linkage mechanism.

[0043] It is understandable that the drive mechanism 500 is vertically mounted on the outer top of the cam box 200, and the output end of the drive mechanism 500 extends vertically and into the cam box 200, such as... Figures 1 to 3 As shown, both the cam mechanism and the linkage mechanism are housed within the cam box 200. The cam mechanism is rotatably connected to the cam box 200, and the output end of the drive mechanism 500 is connected to the cam mechanism, enabling the drive mechanism 500 to drive the cam mechanism to rotate around its vertically extending axis. At least two linkage mechanisms are provided, and the cam mechanism is connected to all linkage mechanisms, thereby converting the rotational motion of the cam mechanism into reciprocating motion of all linkage mechanisms with a certain phase difference.

[0044] In this embodiment, the linkage mechanism performs linear reciprocating motion in the front-to-back direction.

[0045] It is understandable that the number of linkage mechanisms is even, i.e., two, four, or six linkage mechanisms, etc., and the volume of liquid aspiration and dissipation per cycle can be increased by increasing the number of linkage mechanisms. In this embodiment, there are two linkage mechanisms, which are arranged along the axial direction of the cam mechanism, i.e., the two linkage mechanisms are spaced apart in the vertical direction and reciprocate with a phase difference of 180 degrees.

[0046] It is understandable that the pump head 300 is provided with a chamber 310 and a piston 320, one end of the piston 320 is slidably connected to the chamber 310, and the other end of the piston 320 is connected to a connecting rod mechanism, such as... Figure 3 and Figure 4 As shown. When the drive mechanism 500 drives the cam mechanism to rotate, if the linkage mechanism drives the piston 320 to move backward, the piston 320 provides negative pressure to the chamber 310, and the chamber 310 performs a liquid suction operation; if the linkage mechanism drives the piston 320 to move forward, the piston 320 discharges the liquid in the chamber 310, and the chamber 310 performs a liquid drainage operation.

[0047] It is understood that the number of chambers 310 in each pump head 300 is the same as the number of linkage mechanisms and corresponds one-to-one. That is, in this embodiment, the pump head 300 includes two chambers 310 and two pistons 320. The two chambers 310 are vertically spaced and slidably connected to the pistons 320 respectively. The other ends of the two pistons 320 are respectively connected to two linkage mechanisms, such as... Figure 3 As shown.

[0048] Understandably, when the drive mechanism 500 starts and drives the cam mechanism to rotate one revolution, each piston 320 alternately performs one liquid suction operation and one liquid discharge operation.

[0049] It is understandable that a sealing ring 321 is fitted onto the end of the piston 320 furthest from the connecting rod mechanism, such as... Figure 3 As shown, the sealing ring 321 is located between the piston 320 and the chamber 310 and is fixed relative to the piston 320, which improves the sealing between the piston 320 and the chamber 310, ensures that the chamber 310 is a closed space, and improves the accuracy of liquid flow control.

[0050] It is understandable that the manifold 400 is provided with an inlet channel 410 and an outlet channel 420, such as Figure 4 As shown. All chambers 310 are connected to the inlet channel 410 and the outlet channel 420 respectively, so that each chamber 310 can both draw liquid through the inlet channel 410 and discharge liquid through the outlet channel 420. This allows each chamber 310 to independently perform alternating operations of liquid drawing and discharging. The structure is simple and does not require multiple inlet channels 410 and outlet channels 420.

[0051] It is understandable that a one-way valve 330 is provided between the chamber 310 and the inlet channel 410, such as... Figure 4 As shown, this prevents liquid from being discharged through the inlet channel 410 during drainage of chamber 310. Similarly, a one-way valve 340 is provided between chamber 310 and outlet channel 420, such as... Figure 3 As shown, this prevents the chamber 310 from drawing liquid from the outlet channel 420 during liquid aspiration.

[0052] Thus, the drive mechanism 500 drives the cam mechanism to rotate, and the cam mechanism drives the two linkage mechanisms to reciprocate in the left and right directions at the same time, which changes the volume between the chamber 310 and the piston 320. The pressure generated by the volume change causes the inlet check valve 330 to draw in liquid and the outlet check valve to discharge liquid, thereby realizing liquid transportation.

[0053] The two linkage mechanisms reciprocate with a phase difference. When the drive mechanism 500 drives the cam mechanism to rotate at any angle, the liquid output of the pump head 300 is consistent per unit time, thereby achieving the effect of constant flow liquid output and ensuring the filling speed of the liquid, avoiding liquid splashing caused by excessive filling speed.

[0054] It is understandable that the cam mechanism includes a camshaft 610 and a cam 620, such as Figure 3 and Figure 4 As shown. Specifically, the camshaft 610 extends vertically, and its upper end is connected to the output end of the drive mechanism 500. When the drive mechanism 500 is activated, its output end drives the camshaft 610 to rotate around its vertically extending axis. Multiple cams 620 are provided, the same number as the number of linkage mechanisms, i.e., two cams 620 are provided. The two cams 620 are spaced apart along the axial direction of the camshaft 610 and are connected to the linkage mechanisms. The two cams 620 are connected to the camshaft 610 at a phase angle, allowing the two linkage mechanisms to perform alternating liquid suction and discharge operations.

[0055] In this embodiment, the phase angle between the two cams 620 is 180 degrees.

[0056] It is understandable that the cam 620 has an annular cam groove 621, and the center of the cam groove 621 is offset from the axis of the cam shaft 610, such as... Figure 4 As shown. Since the phase angle between the two cams 620 is 180 degrees, when viewed in the vertical direction, the axis of the camshaft 610 is always located between the centers of the two cam grooves 621.

[0057] Understandably, each linkage mechanism is connected to a follower 630, which is embedded in the cam groove 621 and can slide along the cam groove 621, such as... Figure 4 As shown. When the cam 620 is driven to rotate by the camshaft 610, the follower 630 slides in the rotating cam groove 621, thereby driving the connecting rod mechanism and the piston 320 to reciprocate left and right, realizing the liquid suction and discharge operations.

[0058] Understandably, the follower 630 is cylindrical or spherical, allowing it to slide smoothly within the cam groove 621.

[0059] It is understandable that the follower 630 is rotatably connected to the linkage mechanism through the bearing 711, so that the follower 630 can rotate around the upper and lower axes in the cam groove 621, thereby reducing the sliding friction generated by the follower 630 in the cam groove 621.

[0060] Understandably, the suction time of piston 320 is shorter than the discharge time, eliminating the pulsation phenomenon generated during alternating suction and discharge, and avoiding uneven liquid discharge per unit time.

[0061] Understandably, taking two pistons 320 as the first and second pistons respectively, when the first piston moves forward under the action of the horizontally corresponding cam 620, and the first piston gradually decelerates from uniform discharging, the second piston, under the action of the horizontally corresponding cam 620, begins to move forward and accelerates discharging. At this time, the first and second pistons discharge simultaneously, as shown in the example. Figure 5 As shown, this can compensate for the situation where the amount of liquid discharged is small and cannot be uniform when the first piston decelerates and discharges liquid. Figure 5 The two solid lines in the figure represent the changes in the liquid suction speed and liquid discharge speed of the two pistons 320 as the rotation angle of the camshaft changes.

[0062] When the second piston finishes accelerating and begins to discharge liquid at a constant speed, the first piston's forward discharge speed drops to zero and it begins to move backward to draw in liquid. When the second piston finishes discharging liquid forward at a constant speed and begins to decelerate, the first piston finishes drawing in liquid backward and begins to accelerate forward to discharge liquid. When the second piston's forward discharge speed decreases to zero and it begins to draw in liquid backward, the first piston's forward discharge speed changes from an accelerating state to a constant speed. Figure 5 As shown, the alternating cycle is completed, and the constant flow metering pump can ensure uniform discharge of liquid within a unit time.

[0063] Understandably, existing injection pumps use a single-channel filling method to improve filling accuracy, but the filling speed is relatively slow.

[0064] To address this, the pump head 300 is provided with multiple pumps spaced apart along the first direction, such as... Figure 1 , Figure 2 and Figure 4 As shown, the first direction is horizontal and perpendicular to the sliding direction of the linkage mechanism. Multiple pump heads 300 are arranged at left-right intervals, and multiple chambers 310 correspond left-right. Multiple pistons 320 also correspond left-right. These left-right corresponding pistons 320 are connected to the same linkage mechanism, allowing one linkage mechanism to drive multiple pistons 320 at the same horizontal position to simultaneously draw and discharge liquid. Thus, the constant flow metering pump 100 can use a multi-channel filling method to improve filling efficiency. Furthermore, due to the cooperative relationship between the cam mechanism, linkage mechanism, and multiple pistons 320, the constant flow metering pump 100 can ensure the filling accuracy of each channel and the uniform filling volume per unit time, enabling the constant flow metering pump 100 to be applied in high-precision, high-efficiency filling applications.

[0065] It is understandable that the pump head 300 can be three, four, or more. In this embodiment, there are two pump heads 300, that is, the constant flow metering pump 100 is a dual-channel constant flow metering pump 100, which improves the original filling efficiency by 200% and ensures that the filling volume of the two channels has high precision and consistency. Figure 1 , Figure 2 and Figure 4 As shown.

[0066] It is understandable that the linkage mechanism includes a connecting member 710 and a sliding member 720, such as... Figure 3 and Figure 4 As shown. Specifically, the connecting member 710 extends along the first direction, that is, the connecting member 710 extends along the left and right direction. The rear end of the connecting member 710 is rotatably connected to the driven member 630, and the front end of the connecting member 710 is connected to the sliding member 720. The number of sliding members 720 connected to each connecting member 710 is equal to the number of pump heads 300, that is, one connecting member 710 connects to two sliding members 720. Two pistons 320 at the same height position and arranged with left and right spacing are respectively corresponding to and connected to the two sliding members 720, realizing that one linkage mechanism drives multiple pistons 320 at the same height position to move back and forth.

[0067] In this embodiment, the connector 710 is a connecting rod. The sliding member 720 is a ball spline. The ball spline achieves linear motion in the front-to-back direction by the rolling of balls between the inner and outer splines. This allows the ball spline to move back and forth with the connector 710 with high precision, high speed, and low friction, enabling the piston 320 to move precisely back and forth and preventing the piston 320 from deviating.

[0068] Furthermore, the cam box 200 is provided with at least two guide members 210, which are respectively located on two inner sidewalls of the cam box 200 along the first direction. That is, multiple guide members 210 are respectively located on the left inner sidewall and the right inner sidewall of the cam box 200. The two ends of the connecting member 710 along the first direction are slidably connected to the guide members 210 on both sides, such as... Figure 4 As shown.

[0069] In some embodiments, the guide member 210 is a slide rail, and the left and right ends of the connector 710 are slidably connected to the two slide rails respectively, thereby guiding the forward and backward movement of the connector 710 and preventing the connector 710 from being rotated and deviated by the follower 630.

[0070] In this embodiment, the guide 210 is a slider, and the left and right ends of the connector 710 are respectively provided with grooves corresponding to the slider. When the linkage mechanism slides left and right, the grooves move left and right relative to the slider, so as to accurately guide the movement of the connector 710.

[0071] It is understandable that since there are two linkage mechanisms with vertical spacing, there are four guide members 210. Two guide members 210 are located at the top and are slidably connected to the left and right ends of the upper connecting member 710, respectively. The other two guide members 210 are located at the bottom and are slidably connected to the left and right ends of the lower connecting member 710, respectively.

[0072] It is understandable that the distance between the guide 210 and the cam 620 is set to avoid the guide 210 interfering with the rotation of the cam 620.

[0073] Understandably, since multiple linkage mechanisms are arranged vertically, the inlet channel 410 and outlet channel 420 also extend vertically, so that the connection positions of each chamber 310 and the inlet channel 410 correspond vertically, i.e., multiple inlet check valves 330 are vertically opposite each other, and the connection positions of each chamber 310 and the outlet channel 420 correspond vertically, i.e., multiple outlet check valves 340 are vertically opposite each other. The inlet channel 410 and outlet channel 420 are spaced apart along the first direction to prevent them from interfering with each other.

[0074] In this embodiment, the manifold 400, pump head 300, and cam box 200 are connected sequentially in the front-to-back direction.

[0075] It is understandable that the manifold 400 is equipped with an inlet connector 430 for liquid inlet and an outlet connector 440 for liquid outlet, such as... Figures 1 to 3 As shown, both the inlet connector 430 and the outlet connector 440 are located on the side of the manifold 400 away from the pump head 300, that is, both the inlet connector 430 and the outlet connector 440 are located at the front end of the manifold 400. The inlet connector 430 is connected to the inlet channel 410, and liquid enters the chamber 310 through the negative pressure of the piston 320 from the inlet check valve 330, the inlet channel 410, and the inlet connector 430. The outlet connector 440 is connected to the outlet channel 420, and when the piston 320 discharges the liquid from the chamber 310, the liquid passes sequentially through the outlet check valve 340, the outlet channel 420, and the outlet connector 440.

[0076] In some embodiments, since the inlet channel 410 and the outlet channel 420 are spaced apart in the left and right direction, the inlet connector 430 and the outlet connector 440 can be opposite each other in the left and right. However, the left and right arrangement of the inlet connector 430 and the outlet connector 440 can easily lead to the left and right length of the constant flow metering pump 100 being too large, thus increasing the volume of the constant flow metering pump 100.

[0077] In this embodiment, the connection between the inlet connector 430 and the inlet channel 410 is located below the connection between the outlet connector 440 and the outlet channel 420, that is, the inlet connector 430 is located diagonally below the outlet connector 440. Figures 1 to 3 As shown, this design ensures that the inlet connector 430 and the outlet connector 440 do not interfere with each other, reduces the left and right lengths of the constant flow metering pump 100, and facilitates quick differentiation between the inlet connector 430 and the outlet connector 440.

[0078] It is understandable that the number of manifolds 400 is the same as the number of pump heads 300, that is, there are two manifolds 400 and they are respectively connected to the front end of two pump heads 300, so that the liquid inlet and outlet of each pump head 300 are not disturbed, thereby improving the high accuracy of the multi-channel constant flow metering pump 100.

[0079] It is understandable that the drive mechanism 500 includes a motor 510, a reducer 520, and a coupling 530, such as Figure 2 As shown. Specifically, motor 510 is a general rotary motor 510, and the output end of motor 510 is connected to reducer 520 for transmission. Reducer 520 can convert the high-speed, low-torque rotary motion of motor 510 into the low-speed, high-torque rotary motion required by the cam mechanism, solving the problem of excessive speed and insufficient torque when motor 510 is directly connected to the cam mechanism. Moreover, the high-torque camshaft 610 can better drive multiple pistons 320 for liquid suction and discharge.

[0080] Understandably, the output end of the reducer 520 is connected to the camshaft 610 via the coupling 530, ensuring that the reducer 520 performs efficient rotational motion and torque transmission to the camshaft 610, thereby enabling the camshaft 610 to rotate.

[0081] Understandably, the flow rate of the constant flow metering pump 100 is intelligently and numerically controlled by the motor 510, thereby adjusting the flow rate of the constant flow metering pump 100 and ensuring high flow accuracy.

[0082] Understandably, the cam box 200 is equipped with support feet 220 at its base. These support feet 220 can be made of cushioning materials such as rubber or silicone, serving both a supporting function and vibration damping. The left and right outer walls of the cam box 200 are each equipped with handles 230 for easy transfer of the constant flow metering pump 100.

[0083] Working principle: The drive mechanism 500 drives the camshaft 610 to rotate, and the camshaft 610 drives two cams 620 to rotate with a certain phase difference. Because the distance between the outer edge of the follower 630 and the central axis of the camshaft 610 constantly changes, the cams 620 drive two linkage mechanisms to alternately reciprocate back and forth during rotation. When the linkage mechanism moves backward, the chamber 310 is sucked in by the piston 320 and the inlet check valve 330, and liquid flows into the chamber 310. When the linkage mechanism moves forward, the chamber 310 is discharged by the piston 320 and the outlet check valve 340, ensuring stable liquid discharge with a consistent discharge volume per unit time, without pulsation, achieving precise liquid delivery and constant flow discharge.

[0084] Two pump heads 300 are provided. Each linkage mechanism simultaneously drives the two pistons 320 arranged on the left and right sides of the two pump heads 300 to move back and forth, thereby enabling the two pump heads 300 to fill at the same time, improving production efficiency and ensuring high filling accuracy of the dual-channel constant flow metering pump 100.

[0085] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A constant flow metering pump, characterized in that, Including: A cam box, wherein a drive mechanism, a cam mechanism and at least two linkage mechanisms are provided inside the cam box; the output end of the drive mechanism drives the cam mechanism to rotate, so that the cam mechanism drives all the linkage mechanisms to reciprocate with a phase difference. The pump head is provided with chambers corresponding to the linkage mechanism. A piston is slidably connected to each chamber. The piston is connected to the linkage mechanism. When the drive mechanism drives the cam mechanism to rotate one revolution, the piston alternately performs liquid suction and liquid discharge. The manifold is provided with an inlet channel and an outlet channel. All the chambers are connected to the inlet channel and are each provided with an inlet check valve. All the chambers are connected to the outlet channel and are each provided with an outlet check valve.

2. The constant flow metering pump according to claim 1, characterized in that, The cam mechanism includes a camshaft and multiple cams. The output end of the drive mechanism is connected to the camshaft for transmission. The cams correspond one-to-one with the linkage mechanism. The multiple cams are connected to the camshaft at a phase angle.

3. The constant flow metering pump according to claim 2, characterized in that, The cam is provided with a cam groove that is eccentrically set with respect to the camshaft, and the linkage mechanism is connected to a follower, which is slidably connected within the cam groove.

4. The constant flow metering pump according to claim 1, characterized in that, The piston's suction time is shorter than its discharge time.

5. The constant flow metering pump according to claim 4, characterized in that, The pump head includes two chambers. When the cam mechanism rotates and drives one of the pistons to gradually change from a uniform discharge state to a decelerated discharge state, the other piston changes from a suction state to a discharge state with increased speed.

6. The constant flow metering pump according to claim 3, characterized in that, The pump head is provided with at least two pump heads and is arranged at intervals along a first direction. The plurality of pistons arranged along the first direction are connected to the same linkage mechanism. The first direction is perpendicular to the movement direction of the linkage mechanism.

7. The constant flow metering pump according to claim 6, characterized in that, The linkage mechanism includes a connector and a slider. The connector extends along a first direction. One end of the connector is rotatably connected to the driven member. The other end of the connector is connected to a plurality of sliders. The plurality of sliders are respectively connected to a plurality of pistons arranged along the first direction.

8. The constant flow metering pump according to claim 7, characterized in that, The cam box is provided with guide members on its two inner sides along the first direction, and the connecting member is slidably connected to the two guide members at both ends along the first direction.

9. The constant flow metering pump according to claim 1, characterized in that, The inlet channel and the outlet channel extend along the laying direction of the multiple linkage mechanisms. The manifold corresponds to the pump head one by one. The side of the manifold away from the pump head is provided with an inlet connector and an outlet connector. The inlet connector is connected to the inlet channel, and the outlet connector is connected to the outlet channel.

10. The constant flow metering pump according to claim 2, characterized in that, The drive mechanism includes a motor, a reducer, and a coupling. The output end of the motor is connected to the reducer, and the reducer and the camshaft are connected through the coupling.

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