Constant-flow metering pump

Abstract

The invention discloses a constant flow metering pump which comprises a cam box, a pump head and a confluence block, a driving mechanism, a cam mechanism and at least two connecting rod mechanisms are arranged in the cam box, and the output end of the driving mechanism drives the cam mechanism to rotate, so that the cam mechanism drives all the connecting rod mechanisms to reciprocate at phase differences; the pump head is provided with cavities in one-to-one correspondence with the connecting rod mechanisms, the cavities are connected with pistons in a sliding mode, the pistons are connected with the connecting rod mechanisms, and when the driving mechanism drives the cam mechanism to rotate by one circle, the pistons alternately suck liquid and discharge liquid; the confluence block is provided with a liquid inlet channel and a liquid outlet channel, all the cavities are communicated with the liquid inlet channel and provided with liquid inlet one-way valves respectively, and all the cavities are communicated with the liquid outlet channel and provided with liquid outlet one-way valves respectively. The technical problems that in the prior art, the pulsation phenomenon occurs in filling, and the filling efficiency is too low can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of filling equipment, and particularly relates to a constant flow metering pump. Background Art

[0002] In industries such as batteries, cosmetics, food, electronic products, and biological reagents, precise metering injection pumps are required for liquid dispensing, filling, and other production processes during product production.

[0003] However, the existing precise injection pumps will produce pulsation phenomena during filling. When performing large-flow filling, multiple liquid discharges for metering are required. If the filling speed is too fast, serious liquid splashing will occur; if the filling speed is too slow, the filling efficiency will be affected. Summary of the Invention

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

[0005] The technical solution adopted to solve the above technical problems: The present invention discloses a constant flow metering pump, including: A cam box, in which a driving mechanism, a cam mechanism, and at least two link mechanisms are provided. The output end of the driving mechanism drives the cam mechanism to rotate, so that the cam mechanism drives all the link mechanisms to perform reciprocating motions with a phase difference; A pump head, which is provided with chambers corresponding to the link mechanisms one by one. A piston is slidably connected in the chamber, and the piston is connected to the link mechanism. When the driving mechanism drives the cam mechanism to rotate one week, the piston alternately performs liquid suction and discharge; A manifold block, which is provided with an inlet channel and an outlet channel. All the chambers are communicated with the inlet channel and are respectively provided with inlet check valves, and all the chambers are communicated with the outlet channel and are respectively provided with outlet check valves.

[0006] The present invention has at least the following beneficial effects: The driving mechanism drives the cam mechanism to rotate, so that the cam mechanism drives multiple link mechanisms to perform reciprocating motions. The link mechanisms are connected to the piston, so that the piston moves reciprocally relative to the chamber, thereby changing the volume between the chamber and the piston. The pressure generated by the volume change forces the chamber to alternately perform liquid suction and discharge. Since multiple link mechanisms perform reciprocating motions with a phase difference, as the cam mechanism rotates, multiple pistons in the pump head also perform reciprocating motions with a phase difference. The liquid volume output by the pump head per unit time is the same, thus achieving the effect of constant liquid discharge, and the alternately moving pistons can effectively prevent the generation of pulsation phenomena, avoiding liquid splashing while ensuring the filling speed.

[0007] The manifold is provided with an inlet channel and an outlet channel. All chambers in the pump head are connected to the inlet channel and are provided with an inlet check valve. Therefore, when the piston moves relative to the chamber to absorb liquid, the liquid passes through the inlet check valve and is input into the chamber through the inlet channel. All chambers in the pump head are connected to the outlet channel and are provided with an outlet check valve. Therefore, when the piston moves relative to the chamber to discharge liquid, the liquid passes through the outlet check valve and is output to the outlet channel through the chamber, and then filled along the outlet channel. The inlet check valve and the outlet check valve can make the suction and discharge of the pump head relatively independent and non-interfering, thereby ensuring the filling accuracy.

[0008] As a further improvement of the above technical solution, the cam mechanism includes a camshaft and multiple cams, the output end of the driving mechanism is transmission-connected to the camshaft, the cams correspond one-to-one to the connecting rod mechanism, and the multiple cams are connected to the camshaft at a phase angle.

[0009] As a further improvement of the above technical solution, the cam is provided with a cam groove eccentrically arranged with respect to the camshaft, the connecting rod mechanism is connected with a follower, and the follower is slidably connected in the cam groove.

[0010] As a further improvement of the above technical solution, the liquid absorption time of the piston is shorter than the liquid discharge time.

[0011] As a further improvement of 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 speed discharge state to a decelerated discharge state, the other piston changes from a suction state to a speed-increasing discharge state.

[0012] As a further improvement of the above technical solution, the pump head is provided with at least two and arranged at intervals along a first direction, the multiple pistons arranged along the first direction are connected to the same connecting rod mechanism, and the first direction is perpendicular to the movement direction of the connecting rod mechanism.

[0013] As a further improvement of the above technical solution, the connecting rod mechanism includes a connecting member and a sliding member, the connecting member extends along the first direction, one end of the connecting member is rotatably connected to the follower, and the other end of the connecting member is connected to a plurality of the sliding members, and the plurality of the sliding members are respectively connected to a plurality of the pistons arranged along the first direction.

[0014] As a further improvement of the above technical solution, guide members are respectively provided on two inner sides of the cam box along the first direction, and two ends of the connecting member along the first direction are respectively slidably connected to the two guide members.

[0015] As a further improvement of the above technical solution, the liquid inlet channel and the liquid outlet channel extend along the laying direction of the plurality of link mechanisms, the manifold blocks correspond to the pump heads one by one, and a liquid inlet joint and a liquid outlet joint are provided on one side of the manifold block away from the pump head. The liquid inlet joint is communicated with the liquid inlet channel, and the liquid outlet joint is communicated with the liquid outlet channel.

[0016] As a further improvement of the above technical solution, the driving mechanism includes a motor, a speed reducer and a coupling. The output end of the motor is connected to the speed reducer, and the speed reducer and the camshaft are connected through the coupling. Brief Description of the Drawings

[0017] The present invention will be further described below with reference to the drawings and embodiments; Figure 1 is the overall structural schematic diagram of the constant flow metering pump provided by the embodiment of the present invention; Figure 2 is the front view of the constant flow metering pump provided by the embodiment of the present invention; Figure 3 is Figure 2 the sectional view taken along A-A of Figure 4 is Figure 3 the sectional view taken along B-B of Figure 5 is the chart of the piston speed of the constant flow metering pump provided by the embodiment of the present invention changing with the angle.

[0018] The reference signs in the drawings are as follows: 100, constant flow metering pump; 200, cam box; 210, guide member; 220, support foot; 230, handle; 300, pump head; 310, chamber; 320, piston; 321, sealing ring; 330, inlet check valve; 340, outlet check valve; 400, manifold block; 410, liquid inlet channel; 420, liquid outlet channel; 430, liquid inlet joint; 440, liquid outlet joint; 500, driving mechanism; 510, motor; 520, speed reducer; 530, coupling; 610, camshaft; 620, cam; 621, cam groove; 630, follower; 710, connecting member; 711, bearing; 720, sliding member. Detailed Embodiments

[0019] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0020] In the description of the present invention, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention.

[0021] In the description of the present invention, if there are descriptions with words such as "several", its meaning is one or more, and the meaning of multiple is two or more. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there are descriptions of first, second, third, etc., they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0022] It should be noted that in the accompanying drawings, the X direction points from the rear side to the front side of the constant flow metering pump; the Y direction points from the right side to the left side of the constant flow metering pump; the Z direction points from the lower side to the upper side of the constant flow metering pump.

[0023] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0024] Refer to Figures 1 to 5 , and several embodiments of the constant flow metering pump of the present invention are given below.

[0025] As Figures 1 to 5 shown, the constant flow metering pump 100 of the embodiment of the present invention includes a cam box 200, a pump head 300, and a manifold block 400. Specifically, the cam box 200 is connected to the pump head 300 to drive the pump head 300 to suck and discharge liquid; one end of the pump head 300 away from the cam box 200 is connected to the manifold block 400, and the manifold block 400 is used to provide stable liquid inlet and outlet for the pump head 300.

[0026] In this embodiment, the cam box 200 includes a driving mechanism 500, a cam mechanism, and a connecting rod mechanism.

[0027] It can be understood that the driving mechanism 500 is vertically installed on the outer top of the cam box 200, and the output end of the driving mechanism 500 extends in the up and down direction and extends into the cam box 200, as Figures 1 to 3 shown. The cam mechanism and the connecting rod mechanism are both arranged in the cam box 200. The cam mechanism is rotatably connected to the cam box 200, and the output end of the driving mechanism 500 is connected to the cam mechanism, so that the driving mechanism 500 can drive the cam mechanism to rotate around the axis extending in the up and down direction. There are at least two connecting rod mechanisms, and the cam mechanism is connected to all the connecting rod mechanisms, so as to convert the rotational motion of the cam mechanism into the reciprocating motion of all the connecting rod mechanisms with a certain phase difference.

[0028] In this embodiment, the connecting rod mechanism performs a linear reciprocating motion in the front and back direction.

[0029] It can be understood that the number of the connecting rod mechanisms is an even number, that is, the connecting rod mechanisms are two, four, six, etc. The volume of liquid suction and drainage per time can be increased by increasing the number of the connecting rod mechanisms. In this embodiment, the number of the connecting rod mechanisms is two and they are arranged along the axis direction of the cam mechanism, that is, the two connecting rod mechanisms are arranged at intervals in the up and down direction and perform reciprocating motion with a phase difference of 180 degrees.

[0030] It can be understood that the pump head 300 is provided with a chamber 310 and a piston 320. One end of the piston 320 is slidably connected in the chamber 310, and the other end of the piston 320 is connected to the connecting rod mechanism, as Figure 3 and Figure 4 shown. When the driving mechanism 500 drives the cam mechanism to rotate, if the connecting rod mechanism drives the piston 320 to move backward, the piston 320 provides negative pressure for the chamber 310, and the chamber 310 performs a liquid suction operation; if the connecting rod mechanism drives the piston 320 to move forward, the piston 320 discharges the liquid in the chamber 310, so that the chamber 310 performs a liquid drainage operation.

[0031] It can be understood that the number of the chambers 310 of each pump head 300 is the same as the number of the connecting rod mechanisms and they correspond one by one. That is, in this embodiment, the pump head 300 includes two chambers 310 and two pistons 320. The two chambers 310 are arranged at intervals in the up and down direction and are respectively slidably connected with pistons 320. The other ends of the two pistons 320 are respectively connected to the two connecting rod mechanisms, as Figure 3 shown.

[0032] It can be understood that when the driving mechanism 500 is started and drives the cam mechanism to rotate one week, each piston 320 alternately performs a liquid suction operation and a liquid drainage operation once.

[0033] It can be understood that a sealing ring 321 is sleeved on the end of the piston 320 away from the connecting rod mechanism, as Figure 3As shown, the sealing ring 321 is located between the piston 320 and the chamber 310 and is relatively fixed to the piston 320, improving the sealing between the piston 320 and the chamber 310, ensuring that the chamber 310 is an enclosed space, and improving the accuracy of liquid flow control.

[0034] It can be understood that the manifold block 400 is provided with a liquid inlet passage 410 and a liquid outlet passage 420, as Figure 4 shown. All the chambers 310 are respectively connected to the liquid inlet passage 410 and the liquid outlet passage 420, enabling each chamber 310 to suck liquid through the liquid inlet passage 410 and discharge liquid through the liquid outlet passage 420, realizing the alternate operation of sucking and discharging liquid independently for each chamber 310. The structure is simple and there is no need to provide multiple liquid inlet passages 410 and liquid outlet passages 420.

[0035] It can be understood that a liquid inlet check valve 330 is provided between the chamber 310 and the liquid inlet passage 410, as Figure 4 shown, to prevent the liquid in the chamber 310 from being discharged through the liquid inlet passage 410 during liquid discharge. Similarly, a liquid outlet check valve 340 is provided between the chamber 310 and the liquid outlet passage 420, as Figure 3 shown, to prevent the chamber 310 from sucking liquid from the liquid outlet passage 420 during liquid suction.

[0036] In this way, the driving mechanism 500 drives the cam mechanism to make a rotational motion, and the cam mechanism drives the two link mechanisms to perform reciprocating motions in the left - right direction simultaneously, causing the volume between the chamber 310 and the piston 320 to change. The pressure generated by the volume change causes the liquid inlet check valve 330 to suck liquid and the liquid discharge check valve to discharge liquid, thereby realizing liquid transportation.

[0037] The two link mechanisms perform reciprocating motions with a phase difference. When the driving mechanism 500 drives the cam mechanism to rotate by any angle, the liquid discharge volume of the pump head 300 per unit time is consistent, thus achieving the effect of constant - flow liquid discharge, and ensuring the liquid filling speed, avoiding liquid splashing caused by too fast liquid filling speed.

[0038] It can be understood that the cam mechanism includes a camshaft 610 and cams 620, as Figure 3 and Figure 4 shown. Specifically, the camshaft 610 extends in the up - down direction, and the upper end of the camshaft 610 is in transmission connection with the output end of the driving mechanism 500. When the driving mechanism 500 is started, the output end of the driving mechanism 500 drives the camshaft 610 to rotate around its axis extending in the up - down direction. There are multiple cams 620 and the number is the same as the number of link mechanisms, that is, there are two cams 620. The two cams 620 are spaced along the axis direction of the camshaft 610, and the cams 620 are connected to the link mechanisms. The two cams 620 are connected to the camshaft 610 with a phase angle, enabling the two link mechanisms to perform sucking and discharging operations alternately.

[0039] In this embodiment, the phase angle of the two cams 620 is 180 degrees.

[0040] It can be understood that the cam 620 is provided with an annular cam groove 621, and the center of the cam groove 621 is eccentrically arranged with the axis of the camshaft 610, as Figure 4 shown. Since the phase angle of the two cams 620 is 180 degrees, therefore, in the projection in the up and down direction, the axis of the camshaft 610 is always located between the centers of the two cam grooves 621.

[0041] It can be understood that each link mechanism is respectively connected with a follower 630, the follower 630 is embedded in the cam groove 621, and the follower 630 can slide along the cam groove 621, as Figure 4 shown. When the cam 620 is driven by the camshaft 610 to rotate, the follower 630 slides in the rotating cam groove 621, thereby driving the link mechanism and the piston 320 to reciprocate left and right to realize the liquid suction and drainage operations.

[0042] It can be understood that the follower 630 is cylindrical or spherical, so that the follower 630 can slide smoothly in the cam groove 621.

[0043] It can be understood that the follower 630 and the link mechanism are rotatably connected through a bearing 711, so that the follower 630 can rotate around the up and down axis in the cam groove 621, reducing the sliding friction generated by the follower 630 in the cam groove 621.

[0044] It can be understood that the liquid suction time of the piston 320 is less than the liquid drainage time, eliminating the pulsation phenomenon generated in the process of alternating liquid suction and drainage, and avoiding the uneven liquid discharge per unit time.

[0045] It can be understood that taking the two pistons 320 as the first piston and the second piston as an example, when the first piston moves forward under the action of the horizontally corresponding cam 620 and gradually decelerates the liquid drainage from the uniform liquid drainage, the second piston starts to move forward and accelerate the liquid drainage under the action of the horizontally corresponding cam 620. At this time, the first piston and the second piston drain the liquid simultaneously, as Figure 5 shown, which can make up for the situation that the liquid discharge amount of the first piston is less during the decelerated liquid drainage and the liquid discharge amount cannot be made uniform, Figure 5 The two solid lines in represent the changes of the liquid suction speed and the liquid drainage speed of the two pistons 320 with the rotation angle of the camshaft.

[0046] When the second piston finishes accelerating and starts to drain liquid at a constant speed, the forward liquid drainage speed of the first piston drops to zero and it starts to move backward to suck liquid. When the second piston finishes draining liquid forward at a constant speed and starts to decelerate the liquid drainage, the backward liquid suction of the first piston ends and it starts to accelerate the liquid drainage forward. When the forward liquid drainage speed of the second piston reduces to zero and it starts to suck liquid backward, the forward liquid drainage speed of the first piston changes from the accelerating state to the constant speed state, as Figure 5 shown, to complete the alternating cycle, and it can ensure that the constant flow metering pump 100 drains liquid evenly within a unit time.

[0047] It can be understood that the existing liquid injection pumps use a single-channel filling method to improve the filling accuracy, but the filling speed is relatively slow.

[0048] In this regard, the pump head 300 is provided with multiple ones and arranged at intervals along the first direction, as Figure 1 、 Figure 2 and Figure 4 shown. The first direction is the horizontal direction and is perpendicular to the sliding direction of the link mechanism, that is, multiple pump heads 300 are arranged at intervals along the left-right direction, and multiple chambers 310 correspond left and right, and multiple pistons 320 also correspond left and right. The multiple pistons 320 corresponding left and right are connected to the same link mechanism, so that one link mechanism drives the multiple pistons 320 at the same horizontal position to suck and drain liquid simultaneously. In this way, the constant flow metering pump 100 can use a multi-channel filling method to improve the filling efficiency, and due to the cooperation relationship of the cam mechanism, the link mechanism and the multiple pistons 320, the constant flow metering pump 100 can ensure the filling accuracy of each channel and the uniform filling volume within a unit time, so that the constant flow metering pump 100 can be applied to high-precision and high-efficiency filling occasions.

[0049] It can be understood that the pump head 300 can be provided with three, four, etc. In this embodiment, the pump head 300 is provided with two, that is, the constant flow metering pump 100 is a two-channel constant flow metering pump 100, which improves the original filling efficiency by 200%, and can ensure that the filling volumes of the two channels have the characteristics of high precision and consistency, as Figure 1 、 Figure 2 and Figure 4 shown.

[0050] It can be understood that the link mechanism includes a connecting member 710 and a sliding member 720, as Figure 3 and Figure 4As shown. Specifically, the connecting member 710 extends in the first direction, that is, the connecting member 710 extends in the left - 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 by each connecting member 710 is equal to the number of pump heads 300. That is, one connecting member 710 is connected to two sliding members 720. Two pistons 320 arranged at the same height position and spaced left - right are respectively corresponding to and connected to the two sliding members 720 front - to - back, realizing that one linkage mechanism drives multiple pistons 320 at the same height position to move back and forth.

[0051] In this embodiment, the connecting member 710 is a connecting rod. The sliding member 720 is a ball spline. The ball spline realizes linear motion in the front - back direction by the rolling of balls between the inner spline and the outer spline, enabling the ball spline to move back and forth with high precision, high speed and low friction along with the connecting member 710, so that the piston 320 moves accurately back and forth, avoiding the piston 320 from shifting.

[0052] Furthermore, at least two guiding members 210 are provided in the cam box 200. The at least two guiding members 210 are respectively arranged on two inner side walls of the cam box 200 along the first direction. That is, a plurality of guiding members 210 are respectively arranged on the left inner side wall and the right inner side wall of the cam box 200. The two ends of the connecting member 710 along the first direction are respectively slidably connected to the guiding members 210 on both sides, as Figure 4 shown.

[0053] In some embodiments, the guiding member 210 is a slide rail. The left end and the right end of the connecting member 710 are respectively slidably connected to the two slide rails, thereby guiding the back - and - forth movement of the connecting member 710 and preventing the connecting member 710 from rotating and shifting driven by the driven member 630.

[0054] In this embodiment, the guiding member 210 is a slider. The left end and the right end of the connecting member 710 are respectively provided with chutes corresponding to the sliders. When the linkage mechanism slides left - right, the chutes move left - right relative to the sliders, accurately guiding the movement of the connecting member 710.

[0055] It can be understood that since there are two linkage mechanisms arranged at an upper - lower interval, therefore, there are four guiding members 210. Two of the guiding members 210 are located above and are respectively slidably connected to the left end and the right end of the connecting member 710 located above, and the other two guiding members 210 are located below and are respectively slidably connected to the left end and the right end of the connecting member 710 located below.

[0056] It can be understood that the guiding member 210 is arranged at an interval from the cam 620 to avoid the guiding member 210 interfering with the rotation of the cam 620.

[0057] It can be understood that since multiple link mechanisms are arranged in the vertical direction, the liquid inlet channel 410 and the liquid outlet channel 420 also extend in the vertical direction respectively, so that the connection positions of each chamber 310 with the liquid inlet channel 410 correspond vertically, that is, multiple liquid inlet one-way valves 330 are vertically opposite to each other, and the connection positions of each chamber 310 with the liquid outlet channel 420 correspond vertically, that is, multiple liquid outlet one-way valves 340 are vertically opposite to each other. The liquid inlet channel 410 and the liquid outlet channel 420 are spaced apart in the first direction so that they do not interfere with each other.

[0058] In this embodiment, the manifold block 400, the pump head 300, and the cam box 200 are connected in sequence in the front-rear direction.

[0059] It can be understood that the manifold block 400 is provided with a liquid inlet joint 430 for liquid inlet and a liquid outlet joint 440 for liquid outlet. As Figures 1 to 3 shown, both the liquid inlet joint 430 and the liquid outlet joint 440 are located on the side of the manifold block 400 away from the pump head 300, that is, both the liquid inlet joint 430 and the liquid outlet joint 440 are located at the front end of the manifold block 400. The liquid inlet joint 430 is communicated with the liquid inlet channel 410, and the liquid is input into the chamber 310 through the negative pressure of the piston 320 from the liquid inlet one-way valve 330, the liquid inlet channel 410, and the liquid inlet joint 430. The liquid outlet joint 440 is communicated with the liquid outlet channel 420. When the piston 320 discharges the liquid in the chamber 310, the liquid is discharged in sequence through the liquid outlet one-way valve 340, the liquid outlet channel 420, and the liquid outlet joint 440.

[0060] In some embodiments, since the liquid inlet channel 410 and the liquid outlet channel 420 are spaced apart in the left-right direction, the liquid inlet joint 430 and the liquid outlet joint 440 can be opposite left and right. However, the left-right arranged liquid inlet joint 430 and liquid outlet joint 440 are likely to cause the left-right length of the constant flow metering pump 100 to be too large, increasing the volume of the constant flow metering pump 100.

[0061] In this embodiment, the connection position of the liquid inlet joint 430 with the liquid inlet channel 410 is below the connection position of the liquid outlet joint 440 with the liquid outlet channel 420, that is, the liquid inlet joint 430 is located obliquely below the liquid outlet joint 440. As Figures 1 to 3 shown, the liquid inlet joint 430 and the liquid outlet joint 440 do not interfere with each other, reducing the left-right length of the constant flow metering pump 100 and facilitating the quick distinction between the liquid inlet joint 430 and the liquid outlet joint 440.

[0062] It can be understood that the number of manifold blocks 400 is the same as the number of pump heads 300, that is, two manifold blocks 400 are provided and are respectively connected to the front ends of the two pump heads 300, so that the liquid inlet and drainage of each pump head 300 are not interfered, improving the high precision of the multi-channel constant flow metering pump 100.

[0063] It can be understood that the drive mechanism 500 includes a motor 510, a speed reducer 520 and a coupling 530, as Figure 2 shown. Specifically, the motor 510 is a general motor 510 that performs rotational motion. The output end of the motor 510 is drivingly connected to the speed reducer 520. The speed reducer 520 can output the rotational motion of the motor 510 with high speed and low torque as the rotational motion with low speed and high torque required by the cam mechanism, solving the problems of too high speed and insufficient torque when the motor 510 is directly connected to the cam mechanism. Moreover, the camshaft 610 with high torque can better drive a plurality of pistons 320 to suck and discharge liquid.

[0064] It can be understood that the output end of the speed reducer 520 is connected to the camshaft 610 through the coupling 530, ensuring that the speed reducer 520 performs efficient rotational motion and torque transmission to the camshaft 610, so as to realize the rotational motion of the camshaft 610.

[0065] It can be understood that the flow rate of the constant flow metering pump 100 is intelligently numerically controlled by the motor 510, so as to adjust the flow rate of the constant flow metering pump 100 and ensure high flow accuracy.

[0066] It can be understood that the bottom of the cam box 200 is provided with support feet 220, and the support feet 220 can be made of buffer materials such as rubber and silica gel, which not only play a supporting role but also can reduce vibration. The left outer wall and the right outer wall of the cam box 200 are respectively provided with handles 230, which are convenient for transferring the constant flow metering pump 100.

[0067] 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. Since the distance between the outer edge of the follower 630 and the central axis of the camshaft 610 continuously changes, the cams 620 drive two link mechanisms to alternately perform reciprocating motion back and forth during rotation. When the link mechanism moves backward, the chamber 310 realizes liquid suction under the action of the piston 320 and the inlet check valve 330, and the liquid flows into the chamber 310. When the link mechanism moves forward, the chamber 310 realizes liquid discharge under the action of the piston 320 and the outlet check valve 340, so that the liquid discharge is stable and the discharge volume per unit time is the same, without pulsation phenomenon, realizing the precise delivery of the liquid and the constant liquid discharge.

[0068] There are two pump heads 300. Each link mechanism simultaneously drives two pistons 320 arranged left and right in the two pump heads 300 to move back and forth, so as to realize the simultaneous filling of the two pump heads 300, improve the production efficiency and ensure high filling accuracy of the dual-channel constant flow metering pump 100.

[0069] The above has specifically described the preferred embodiments of the present invention. However, the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A constant flow metering pump, characterized in that: Included are: A cam box, wherein a driving mechanism, a cam mechanism and at least two connecting rod mechanisms are arranged in the cam box, and an output end of the driving mechanism drives the cam mechanism to rotate, so that the cam mechanism drives all the connecting rod mechanisms to reciprocate with a phase difference; A pump head, wherein the pump head is provided with chambers corresponding to the connecting rod mechanism one by one, the chambers are slidably connected with pistons, the pistons are connected to the connecting rod mechanism, and when the driving mechanism drives the cam mechanism to rotate one circle, the pistons alternately suck and discharge liquid; A manifold block is provided with a liquid inlet channel and a liquid outlet channel, all the chambers are connected with the liquid inlet channel and are respectively provided with a liquid inlet check valve, and all the chambers are connected with the liquid outlet channel and are respectively provided with a liquid outlet check valve.

2. The constant flow metering pump according to claim 1, characterized in that: The cam mechanism includes a camshaft and a plurality of cams. The output end of the driving mechanism is drivingly connected to the camshaft. The cams correspond to the connecting rod mechanism one by one. The plurality of 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 eccentrically arranged with the cam shaft, and the connecting rod mechanism is connected with a follower, and the follower is slidably connected in the cam groove.

4. The constant flow metering pump according to claim 1, characterized in that: The liquid suction time of the piston is shorter than the liquid 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 speed liquid discharge state to a decelerated liquid discharge state, the other piston changes from a liquid suction state to a liquid discharge state with an increased speed.

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

7. The constant flow metering pump according to claim 6, characterized in that: The connecting rod mechanism includes a connecting member and a sliding member, wherein the connecting member extends along a first direction, one end of the connecting member is rotationally connected to the driven member, and the other end of the connecting member is connected to a plurality of the sliding members, and the plurality of the sliding members are respectively connected to a plurality of the pistons arranged along the first direction.

8. The constant flow metering pump according to claim 7, characterized in that: The two inner sides of the cam box along the first direction are respectively provided with guide members, and the two ends of the connecting member along the first direction are respectively slidably connected with the two guide members.

9. The constant flow metering pump according to claim 1, characterized in that: The liquid inlet channel and the liquid outlet channel extend along the laying direction of the multiple connecting rod mechanisms, the manifold blocks correspond to the pump heads one by one, and a liquid inlet joint and a liquid outlet joint are provided on the side of the manifold away from the pump head. The liquid inlet joint is connected to the liquid inlet channel, and the liquid outlet joint is connected to the liquid outlet channel.

10. The constant flow metering pump according to claim 1, characterized in that: The driving 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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