Constant-flow diaphragm pump

Abstract

The invention discloses a constant-flow diaphragm pump which comprises a first pump chamber, a second pump chamber and a cam, the cam comprises a first transmission position and a second transmission position which are opposite, the first transmission position is in transmission connection with the first pump chamber, the second transmission position is in transmission connection with the second pump chamber, the cam further comprises an extending stroke and a return stroke, and the extending stroke is in transmission connection with the first pump chamber. The extending stroke comprises a flow increasing initial stroke, a flow stabilizing intermediate stroke and a flow decreasing final stroke; when the first pump chamber is in the initial stroke, the second pump chamber is in the final stroke; when the first pump chamber is in the medium range, the second pump chamber is in the return range; when the first pump chamber is in the final stroke, the second pump chamber is in the initial stroke; when the first pump chamber is in the return stroke, the second pump chamber is in the middle stroke. The invention is applied to the field of active fluid conveying equipment.

Description

Technical Field

[0001] The invention relates to the field of active fluid conveying equipment, and in particular to a constant-flow diaphragm pump. Background Art

[0002] Diaphragm pumps, also known as control pumps, are the main type of actuators. They receive control signals output by the control control unit and use power to change the fluid flow rate. The role of the diaphragm pump in the control process is to receive control signals from the regulator or computer, change the flow rate of the regulated medium, and maintain the regulated parameters within the required range, thereby achieving automation of the production process.

[0003] In the related art, a diaphragm pump changes the volume of the working chamber by moving the diaphragm back and forth to suck in and discharge the fluid. When filling or coating the fluid, the delivery pump is required to have high precision, high efficiency, constant flow and no pulsation. It is also required to be corrosion-resistant, wear-free and able to deliver viscous liquids. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a constant current diaphragm pump, which can reduce pulses and improve conveying accuracy and conveying efficiency.

[0005] A constant flow diaphragm pump according to an embodiment of the present invention comprises: The first pump chamber and the second pump chamber; The cam comprises a first transmission position and a second transmission position relative to each other, wherein the first transmission position is transmission-connected to the first pump chamber, and the second transmission position is transmission-connected to the second pump chamber, and the cam further comprises a push stroke and a return stroke, wherein the push stroke comprises an initial stroke for increasing flow, a middle stroke for steady flow, and a final stroke for decreasing flow; Among them, when the first pump chamber is in the initial stroke, the second pump chamber is in the final stroke; when the first pump chamber is in the middle stroke, the second pump chamber is in the return stroke; when the first pump chamber is in the final stroke, the second pump chamber is in the initial stroke; when the first pump chamber is in the return stroke, the second pump chamber is in the middle stroke.

[0006] The constant flow diaphragm pump according to the embodiment of the present invention has at least the following beneficial effects: through the movement of the cam, the first pump chamber and the second pump chamber can complement each other in the initial and final stages of the flow change, so that the flow approaches the stable flow in the middle stage, achieving constant flow delivery without pulse, and the delivery accuracy and efficiency of the delivery pump are higher.

[0007] According to some embodiments of the present invention, the cam is capable of rotating around the axial direction of the cam, the cam has a transmission circumferential surface, opposite sides of the transmission circumferential surface respectively have the first transmission position and the second transmission position, and the transmission circumferential surface has the push stroke, the far rest stroke, the return stroke and the near rest stroke sequentially distributed along the circumference of the cam; Among them, within a single rotation cycle of the cam, the movement angle of the push stroke is Φ, and the movement angle of the remote rest stroke is Φ s The return motion angle is Φ', and the near-rest motion angle is Φ' s , the constant flow diaphragm pump satisfies: Φ+Φ s +Φ'+Φ' s =360°, Φ>Φ', 20°≥Φ s ≥0°, 20°≥Φ' s ≥0°.

[0008] According to some embodiments of the present invention, Φ'+90°≥Φ≥Φ'+70°, Φ s =0°, Φ' s =0°.

[0009] According to some embodiments of the present invention, Φ=220°, Φ'=140°.

[0010] According to some embodiments of the present invention, the curve equation of the cam includes: The derivation equation: s=h / 2*(1-cosπφ / Φ) The return equation: s=h / 2*[1+cosπ(φ-Φ) / Φ'] s is the actual stroke of the cam; h is the maximum stroke of the cam; φ is the rotation angle of the cam; Φ is the movement angle of the thrust stroke; Φ' is the movement angle of the return stroke; Φ s is the movement angle of the far resting distance; π is the ratio of a circle to its circumference.

[0011] According to some embodiments of the present invention, the total flow rate of the first pump chamber in the push stroke is Q1, and the total flow rate of the first pump chamber in the return stroke is Q2; The constant flow diaphragm pump is configured as: Q1=Q2.

[0012] According to some embodiments of the present invention, the cam is configured such that when the first pump chamber is in the push stroke, the first pump chamber discharges fluid; when the first pump chamber is in the return stroke, the first pump chamber inhales fluid; when the second pump chamber is in the push stroke, the second pump chamber discharges fluid; and when the second pump chamber is in the return stroke, the second pump chamber inhales fluid.

[0013] According to some embodiments of the present invention, the cam is capable of rotating around the axial direction of the cam, and the cam includes a first transmission end face and a second transmission end face relative to each other, the first transmission end face has the first transmission position, the first transmission end face has the push stroke and the return stroke distributed sequentially along the circumference of the cam, the second transmission end face has the second transmission position, and the second transmission end face has the return stroke and the push stroke distributed sequentially along the axial direction of the cam.

[0014] According to some embodiments of the present invention, the cam, the first pump chamber, and the second pump chamber are distributed sequentially along the first direction.

[0015] According to some embodiments of the present invention, the constant flow diaphragm pump further includes: a transmission assembly that transmits power to the cam, the first pump chamber, and the second pump chamber, the transmission assembly including a first transmission member and a second transmission member, the first transmission member having a first end and a second end sequentially arranged along the first direction, the second transmission member having a third end and a fourth end sequentially arranged along the first direction, the first end and the third end both elastically abut against the outer circumferential surface of the cam, the second end is connected to the first pump chamber, and the fourth end is connected to the second pump chamber.

[0016] According to some embodiments of the present invention, the first pump chamber and the second pump chamber are arranged opposite to each other along the first direction, the second end is connected to a side of the first pump chamber away from the second pump chamber, and the fourth end is connected to a side of the second pump chamber away from the first pump chamber.

[0017] According to some embodiments of the present invention, the first transmission member further comprises a first rotating member disposed at the first end portion, the first rotating member being capable of rotating about the second direction, and an outer peripheral surface of the cam abutting against an outer peripheral surface of the first rotating member; The second transmission member further includes a second rotating member disposed at the second end portion, the second rotating member can rotate around the second direction, and the outer peripheral surface of the cam abuts against the outer peripheral surface of the second rotating member.

[0018] According to some embodiments of the present invention, the first rotating member is a bearing, and / or the second rotating member is a bearing.

[0019] According to some embodiments of the present invention, the second transmission member includes a first rod portion arranged along the first direction, and the first transmission member is slidably connected to the first rod portion.

[0020] According to some embodiments of the present invention, the transmission assembly also includes a linkage member and an elastic member, the linkage member is arranged between the first transmission member and the first pump chamber along the first direction, the first transmission member is passed through the linkage member along the first direction, the second transmission member also includes a second rod portion, the first rod portion, the linkage member and the second rod portion are sequentially connected along the first direction, the elastic member is sleeved on the first rod portion, and is located between the first end portion and the linkage plate.

[0021] According to some embodiments of the present invention, the constant flow diaphragm pump further comprises: A pump body, wherein the first pump groove and the second pump groove are respectively provided on opposite surfaces along the first direction, and the pump body further comprises the first suction pipe and the first discharge pipe connected to the first pump groove, and the second suction pipe and the second discharge pipe connected to the second pump groove; A first diaphragm and a sealing cover are arranged in the first pump groove and form the first pump chamber, and the first diaphragm is drivingly connected to the cam; The second diaphragm and the sealing cover are arranged in the second pump groove and form the second pump chamber. The second diaphragm is drivingly connected to the cam.

[0022] According to some embodiments of the present invention, the pump body further includes a total suction port and a total discharge port, the first suction pipe and the second suction pipe are both connected to the total suction port, and the first discharge pipe and the second discharge pipe are both connected to the total discharge port.

[0023] According to some embodiments of the present invention, a first one-way valve is provided between the first suction pipe and the first pump chamber, and a second one-way valve is provided between the first pump chamber and the first discharge pipe; A third one-way valve is provided between the second suction pipe and the second pump chamber, and a fourth one-way valve is provided between the second pump chamber and the second discharge pipe.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A schematic diagram of a cam motion curve in a constant flow diaphragm pump according to an embodiment of the present invention; Figure 2A schematic diagram of flow rate variation of a constant flow diaphragm pump in operation according to an embodiment of the present invention; Figure 3 A simplified schematic diagram of the structure of a constant flow diaphragm pump according to an embodiment of the present invention; Figure 4 A schematic cross-sectional structure diagram of a constant flow diaphragm pump according to an embodiment of the present invention; Figure 5 A schematic cross-sectional structure diagram of a constant flow diaphragm pump from another perspective of an embodiment of the present invention.

[0026] Figure Number: A first pump chamber 100; A first suction pipe 110; a first discharge pipe 120; The second pump chamber 200; A second suction pipe 210; a second discharge pipe 220; Cam 300; A driving motor 310; Housing 400; Transmission assembly 500; A first transmission member 510; a first end 511; a second end 512; a first rotating member 513; a first frame 514; a first rotating shaft 515; The second transmission member 520; the third end 521; the fourth end 522; the second rotating member 523; the second frame 524; the second rotating shaft 525; the first rod 526; the second rod 527; Linkage 530; Elastic member 540; Pump body 600; First pump tank 610; second pump tank 620; main suction port 630; main discharge port 640; first check valve 650; second check valve 660; third check valve 670; fourth check valve 680; A first diaphragm 700; The second diaphragm 800 . DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "a number" refers to one or more than one, and "a plurality" refers to two or more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Reference Figures 1 to 5 As shown, the embodiment of the present invention provides a constant flow diaphragm pump, including: the constant flow diaphragm pump, including: a first pump chamber 100, a second pump chamber 200 and a cam 300, In the present embodiment, the cam 300 includes a relative first transmission position and a second transmission position, the first transmission position is transmission-connected to the first pump chamber 100, and the second transmission position is transmission-connected to the second pump chamber 200. The cam 300 also includes a push stroke and a return stroke, and the push stroke includes an initial stroke with increased flow, a middle stroke with a stable flow, and a final stroke with reduced flow; wherein, when the first pump chamber 100 is in the initial stroke, the second pump chamber 200 is in the final stroke; when the first pump chamber 100 is in the middle stroke, the second pump chamber 200 is in the return stroke; when the first pump chamber 100 is in the final stroke, the second pump chamber 200 is in the initial stroke; when the first pump chamber 100 is in the return stroke, the second pump chamber 200 is in the middle stroke.

[0032] It is worth understanding that through the movement of the cam 300, the first pump chamber 100 and the second pump chamber 200 can complement each other in the initial and final stages of flow change, so that the flow rate approaches a stable flow rate in the middle stage, achieving constant flow delivery without pulse, and the delivery accuracy and efficiency of the delivery pump are higher.

[0033] Reference Figure 3 As shown, in some specific embodiments of the present invention, the cam 300 can rotate around the axial direction of the cam 300, and the cam 300 has a transmission circumferential surface, and opposite sides of the transmission circumferential surface respectively have a first transmission position and a second transmission position, and the transmission circumferential surface has a push stroke, a far rest stroke, a return stroke, and a near rest stroke sequentially distributed along the circumference of the cam 300; In a single rotation cycle of the cam, the movement angle of the push stroke is Φ, and the movement angle of the far rest stroke is Φ s The return motion angle is Φ', and the near-rest motion angle is Φ' s , constant flow diaphragm pump meets: Φ+Φ s +Φ'+Φ' s =360°, Φ>Φ', 20°≥Φ s ≥0°, 20°≥Φ' s ≥0°.

[0034] It should be noted that the radial dimension from the outer circumference of the cam 300 to the rotation axis is not a constant value. In other words, its radial dimension changes, and one rotation is a cycle. Taking the cam 300 as an example, the cam 300 includes a base circle portion and a convex circle portion. The base circle portion is the portion where the circle with the smallest radial dimension on the outer circumference of the cam 300 is located, and the rest is the convex circle portion, wherein the convex circle portion also has a circle with the largest radial dimension on the outer circumference of the cam 300, which is defined as the largest circle portion.

[0035] When moving along the outer circumferential surface direction from the base circle portion to the maximum circle portion, the corresponding size of the cam 300 increases, which is generally called the push stroke.

[0036] When the cam 300 rotates along the arc surface corresponding to the largest circular portion, the radial dimension of the cam 300 remains unchanged, which is generally referred to as the far rest stroke.

[0037] When moving along the outer circumferential direction from the largest circle portion to the base circle portion, the corresponding size of the cam 300 decreases, which is generally called a return stroke.

[0038] When the cam 300 rotates along the arc surface corresponding to the base circle portion, the radial dimension of the cam 300 remains unchanged, which is generally referred to as the near rest stroke.

[0039] In some specific embodiments, Φ'+90°≥Φ≥Φ'+70°, Φ s =0°, Φ' s =0°, because the angle corresponding to the near rest stroke is 0°, and the angle corresponding to the far rest stroke is also 0°, so the cam 300 can be regarded as having no near rest stroke and far rest stroke, and the cam 300 only has a push stroke and a return stroke. Figure 1 As shown, in this embodiment, Φ=Φ'+80°, Φ=220°, and Φ'=140°.

[0040] Reference Figure 1 As shown, in some specific embodiments of the present invention, the curve equation of the cam 300 includes: The derivation equation: s=h / 2*(1-cosπφ / Φ) Return equation: s=h / 2*[1+cosπ(φ-Φ-Φ s ) / Φ'] s is the actual stroke of the cam; h is the maximum stroke of the cam; φ is the rotation angle of the cam; that is, the actual rotation angle of the cam is: 0°≤φ≤Φ during the push stroke, and Φ<φ≤360° during the return stroke.

[0041] Φ is the movement angle of the push stroke; Φ refers to: the total movement angle of the cam during the push stroke. When the rotation angle range of the push stroke is 0°≤φ≤220°, Φ is 220°; Φ' is the return motion angle; Φ' refers to the total movement angle of the cam during the return process. When the return rotation angle range is 220°<φ≤360°, Φ' is 140°; Φ s is the movement angle of the far resting distance; π is the ratio of a circle to its circumference.

[0042] Reference Figure 2 As shown, in some specific embodiments of the present invention, the total flow rate of the first pump chamber 100 in the push stroke is Q1, and the total flow rate of the first pump chamber 100 in the return stroke is Q2; the constant flow diaphragm pump is configured as: Q1=Q2.

[0043] It is worth understanding that in one cycle, the time occupied by the push stroke is greater than the time occupied by the return stroke. During the return stroke, when the speed of the fluid in the first pump chamber 100 or the second pump chamber 200 is greater than the speed of the fluid during the push stroke, the total flow rate of the push stroke and the return stroke can be made substantially the same, thereby achieving constant fluid delivery. In this embodiment, the first pump chamber 100 discharges fluid during the push stroke, the first pump chamber 100 inhales fluid during the return stroke, the second pump chamber 200 discharges fluid during the push stroke, and the second pump chamber 200 inhales fluid during the return stroke.

[0044] Reference Figure 2 As shown, in some specific embodiments of the present invention, the cam 300 is configured so that when the first pump chamber 100 is in the push stroke, the first pump chamber 100 discharges the fluid; when the first pump chamber 100 is in the return stroke, the first pump chamber 100 inhales the fluid; when the second pump chamber 200 is in the push stroke, the second pump chamber 200 discharges the fluid; when the second pump chamber 200 is in the return stroke, the second pump chamber 200 inhales the fluid.

[0045] Specifically, when the cam 300 is in the initial stroke, the acceleration of the inhaled fluid increases; in the middle stroke, the acceleration of the inhaled fluid remains unchanged; in the final stroke, the acceleration of the inhaled fluid decreases; when the cam 300 moves to the maximum stroke h, the acceleration decreases to 0, and the cam 300 enters the return stroke, and the acceleration value increases, but in the opposite direction to the push stroke, which is reflected as a negative value in the figure.

[0046] In some other specific embodiments of the present invention, the cam 300 is capable of rotating around the axial direction of the cam 300, and the cam 300 includes a first transmission end face and a second transmission end face relative to each other, the first transmission end face has a first transmission position, and the first transmission end face has a push stroke and a return stroke distributed sequentially along the circumference of the cam 300, the second transmission end face has a second transmission position, and the second transmission end face has a return stroke and a push stroke distributed sequentially along the axial direction of the cam 300.

[0047] The cam 300 is cylindrical, and both end surfaces of the cylinder have annular and undulating curved surfaces, and the two curved surfaces are respectively a first transmission end surface and a second transmission end surface.

[0048] Specifically, the positions between the first transmission end face and the second transmission end face may be staggered along the circumferential stroke of the cam 300. When the first transmission position and the second transmission position are located on the same straight line in the same direction as the axis, their specific positions are distributed as follows: When the first transmission position is in the initial range, the second transmission position is in the final range; When the first transmission position is in the mid-range, the second transmission position is in the return range; When the first transmission position is in the final range, the second transmission position is in the initial range; When the first transmission position is in the return stroke, the second transmission position is in the mid-stroke.

[0049] As another embodiment, the first transmission end face and the second transmission end face may be symmetrical to each other, and the first transmission position and the second transmission position may be staggered along the circumference of the cam 300, or the first transmission end face and the second transmission end face may be staggered along the circumference of the cam 300, and the first transmission position and the second transmission position may be staggered along the circumference of the cam 300.

[0050] Reference Figure 3 As shown, in some specific embodiments of the present invention, the cam 300, the first pump chamber 100 and the second pump chamber 200 are distributed in sequence along the first direction. The constant flow diaphragm pump also includes a first suction pipe 110, a first pump chamber 100 and a first discharge pipe 120 that are connected in sequence in one direction, a second suction pipe 210, a second pump chamber 200 and a second discharge pipe 220 that are connected in sequence in one direction, and a cam 300.

[0051] In this embodiment, the constant flow diaphragm pump further comprises a housing 400, and the first pump chamber 100, the second pump chamber 200, and the cam 300 are all disposed within the housing 400. The specific shape of the housing 400 can be selected according to actual needs, such as a rectangular or cylindrical shape, and the present invention does not limit its specific shape.

[0052] The cam 300 is transmission-connected to the first pump chamber 100, and can drive the first pump chamber 100 to inhale fluid from the first suction pipe 110 or discharge fluid to the first discharge pipe 120. The cam 300 is also transmission-connected to the second pump chamber 200, and can drive the second pump chamber 200 to inhale fluid from the second suction pipe 210 or discharge fluid to the second discharge pipe 220. The cam 300 and the first pump chamber 100 are sequentially arranged along a first direction, and the cam 300 and the second pump chamber 200 are sequentially arranged along a first direction.

[0053] Among them, when the constant flow diaphragm pump needs to continuously inhale and discharge fluid, generally speaking, when the first pump chamber 100 is in the fluid inhaling state, the second pump chamber 200 is in the fluid discharging state; when the first pump chamber 100 is in the fluid discharging state, the second pump chamber 200 is in the fluid inhaling state; the first pump chamber 100 and the second pump chamber 200 alternately inhale and discharge the fluid to achieve continuous suction and discharge of the fluid.

[0054] It is worth understanding that by arranging the cam 300 on the same side of the first pump chamber 100 and the second pump chamber 200, the first pump chamber 100 and the second pump chamber 200 do not need to be separated by the cam 300, the distance between the first pump chamber 100 and the second pump chamber 200 is shorter, and the path through which the fluid transported by the first pump chamber 100 and the second pump chamber 200 passes is shorter, thereby improving the fluid transport efficiency. In addition, the distance between the first pump chamber 100 and the second pump chamber 200 is shorter, which makes it easier to arrange the pipeline connecting the first pump chamber 100 and the second pump chamber 200, thereby saving the pipeline arrangement cost.

[0055] In this embodiment, when the first transmission member 510 contacts the outer circumferential surface of the base circle part, the first transmission member 510 remains stationary and the first pump chamber 100 maintains its original size; when the first transmission member 510 contacts the thrust stroke in the outer circumferential surface of the cam, the first transmission member 510 squeezes the first pump chamber 100, the volume of the first pump chamber 100 decreases and the fluid is discharged.

[0056] When the first transmission member 510 contacts the return stroke of the outer peripheral surface of the cam, the first transmission member 510 pulls back the first pump chamber 100, and the volume of the first pump chamber 100 increases and sucks in fluid.

[0057] When the second transmission member 520 contacts the outer circumferential surface of the base circle portion, the second transmission member 520 remains stationary and the second pump chamber 200 maintains its original size.

[0058] When the second transmission member 520 contacts the outer peripheral surface of the cam during the push stroke, the second transmission member 520 squeezes the second pump chamber 200, the volume of the second pump chamber 200 decreases and the fluid is discharged; when the second transmission member 520 contacts the outer peripheral surface of the cam during the return stroke, the second transmission member 520 pulls back the second pump chamber 200, the volume of the second pump chamber 200 increases and the fluid is sucked in.

[0059] Specifically, the constant flow diaphragm pump further includes a driving motor 310 , which has an output shaft along the second direction, and the output shaft is drivingly connected to the cam 300 to drive the cam 300 to rotate around the second direction.

[0060] Reference Figure 3 and Figure 4 As shown, in some specific embodiments of the present invention, the constant flow diaphragm pump also includes: a transmission assembly 500 connecting the cam 300, the first pump chamber 100 and the second pump chamber 200, the transmission assembly 500 includes a first transmission member 510 and a second transmission member 520, the first transmission member 510 has a first end 511 and a second end 512 arranged in sequence along the first direction, the second transmission member 520 has a third end 521 and a fourth end 522 arranged in sequence along the first direction, the first end 511 and the third end 521 are both elastically abutted against the outer peripheral surface of the cam 300, the second end 512 is connected to the first pump chamber 100, and the fourth end 522 is connected to the second pump chamber 200.

[0061] In this embodiment, the first end portion 511 is plate-shaped, and the third end portion 521 is also plate-shaped. The plate surfaces of the first end portion 511 and the third end portion 521 elastically abut against the outer peripheral surface of the cam 300 .

[0062] The elastic abutment means that the first end portion 511 and the third end portion 521 abut against the outer peripheral surface of the cam 300 under the elastic force of the outside.

[0063] When the first end 511 or the third end 521 abuts against the return stroke of the cam outer peripheral surface, the first end 511 and the third end 521 will continue to abut against the outer peripheral surface of the cam 300 driven by the elastic force, so that the constant flow diaphragm pump can continuously inhale and discharge fluid.

[0064] Specifically, the first end 511 abuts against a separate elastic object, such as a spring, and the third end 521 also abuts against a separate elastic object, such as a spring.

[0065] The constant flow diaphragm pump further comprises a housing 400, the first end 511 is opposite to one side of the housing 400 and is spaced apart, a spring is arranged between the two, or a separate abutment plate is arranged inside the housing 400, the abutment plate is connected to the housing 400, and is opposite to the first end plate and spaced apart, a spring is arranged between the abutment plate and the first end 511. The connection method between the third end 521 and the spring can also adopt the above method, which will not be described in detail here.

[0066] Reference Figure 3 and Figure 4 As shown, in order to realize the constant flow diaphragm pump that needs to continuously inhale and discharge fluid, in some specific embodiments of the present invention, the first pump chamber 100 and the second pump chamber 200 are arranged opposite to each other along a first direction, the second end 512 is connected to the side of the first pump chamber 100 away from the second pump chamber 200, and the fourth end 522 is connected to the side of the second pump chamber 200 away from the first pump chamber 100.

[0067] Specifically, when the first transmission member 510 is in the push stroke, the first pump chamber 100 is squeezed by the first transmission member 510, the volume of the first pump chamber 100 is reduced and the fluid is discharged. At the same time, the second transmission member 520 is in the return stroke, the second pump chamber 200 is pulled by the second transmission member 520, the volume of the second pump chamber 200 is increased and the fluid is inhaled; when the first transmission member 510 is in the return stroke, the first pump chamber 100 is pulled by the first transmission member 510, the volume of the first pump chamber 100 is increased and the fluid is inhaled. At the same time, the second transmission member 520 is in the push stroke, the second pump chamber 200 is squeezed by the second transmission member 520, the volume of the second pump chamber 200 is reduced and the fluid is discharged.

[0068] Reference Figure 3 , Figure 4 and Figure 5 As shown, in some specific embodiments of the present invention, the first transmission member 510 also includes a first rotating member 513 provided at the first end 511, the first rotating member 513 can rotate around the second direction, and the outer peripheral surface of the cam 300 abuts against the outer peripheral surface of the first rotating member 513; the second transmission member 520 also includes a second rotating member 523 provided at the second end 512, the second rotating member 523 can rotate around the second direction, and the outer peripheral surface of the cam 300 abuts against the outer peripheral surface of the second rotating member 523. Through the sliding abutment of the cam 300, the first rotating member 513 and the second transmission member 520, the outer peripheral surface of the cam 300 is less worn, and the rotation of the cam 300 is smoother, the noise during use is smaller, and the service life is longer.

[0069] Specifically, the first rotating member 513 is a bearing, and the second rotating member 523 is a bearing.

[0070] In this embodiment, the first transmission member 510 further includes a first frame 514 and a first rotating shaft 515 connected to the first frame 514, the first rotating shaft 515 is arranged along the second direction, and the first rotating member 513 is rotatably connected to the first rotating shaft 515. The second transmission member 520 further includes a second frame 524 and a second rotating shaft 525 connected to the second frame 524, the second rotating shaft 525 is arranged along the second direction, and the second rotating member 523 is rotatably connected to the second rotating shaft 525.

[0071] Reference Figure 4 As shown, in some specific embodiments of the present invention, the second transmission member 520 includes a first rod portion 526 arranged along the first direction, and the first transmission member 510 is slidably connected to the first rod portion 526 .

[0072] It is worth understanding that the first transmission member 510 is guided by the first rod portion 526 of the second transmission member 520, so that the movement of the first transmission member 510 along the first direction is more stable, and the first rod portion 526 not only plays a role in transmitting the second transmission member 520, but also plays a role in guiding the first transmission member 510. The first rod portion 526 has multiple functions at the same time, and there is no need to separately set up a guide member for the first transmission member 510, which saves equipment cost and equipment volume and improves the market competitiveness of the constant current diaphragm pump.

[0073] Reference Figure 4 As shown, in some specific embodiments of the present invention, the transmission assembly 500 also includes a linkage member 530 and an elastic member 540. The linkage member 530 is arranged between the first transmission member 510 and the first pump chamber 100 along the first direction. The first transmission member 510 is passed through the linkage member 530 along the first direction. The second transmission member 520 also includes a second rod portion 527. The first rod portion 526, the linkage member 530 and the second rod portion 527 are sequentially connected along the first direction. The elastic member 540 is sleeved on the first rod portion 526 and is located between the first end portion 511 and the linkage plate.

[0074] It is worth understanding that the first transmission member 510 and the second transmission member 520 are linked via the linkage member 530, so that the first transmission member 510 and the second transmission member 520 can share the same elastic member 540 to achieve elastic abutment, and the elastic member 540 can also provide buffering during the movement of the first transmission member 510 and the second transmission member 520 to reduce rigid collision and friction, reduce the operating noise of the constant current diaphragm pump and increase the service life of the constant current diaphragm pump.

[0075] In this embodiment, when the first transmission member 510 moves along the first direction, that is, the first transmission member 510 is in the push range of the cam 300, the first transmission member 510 will compress the elastic member 540 along the first direction; the linkage member 530 is subjected to the reaction force along the first direction applied by the elastic member 540, thereby making the second transmission member 520 have a tendency to move along the first direction and abut against the outer peripheral surface of the cam 300.

[0076] When the first transmission member 510 is in the return stroke of the cam 300, the pressure applied by the first transmission member 510 to the elastic member 540 is cancelled, and the elastic member 540 releases its own elastic potential energy, so that the first transmission member 510 moves in the opposite direction of the first direction and abuts against the outer peripheral surface of the cam 300. At the same time, the second transmission member 520 is in the push stroke of the cam 300, and the second transmission member 520 will move away from the cam 300 in the opposite direction of the first direction, so that the linkage member 530 moves in the opposite direction of the first direction.

[0077] Reference Figure 3 , Figure 4 and Figure 5 As shown, in some specific embodiments of the present invention, the constant flow diaphragm pump further includes: a pump body 600 , a first diaphragm 700 and a second diaphragm 800 .

[0078] In this embodiment, the pump body 600 is provided with a first pump groove 610 and a second pump groove 620 on opposite surfaces along the first direction respectively, and the pump body 600 also includes a first suction pipe 110 and a first discharge pipe 120 connected to the first pump groove 610 and a second suction pipe 210 and a second discharge pipe 220 connected to the second pump groove 620.

[0079] The pump body 600 can be made of SUS316 stainless steel, or other materials. When the transported fluid is corrosive, the material of the pump body 600 needs to be corrosion-resistant.

[0080] Among them, the pump body 600 includes a main part and a connecting part, the first pump tank 610, part of the first suction pipe 110, part of the first discharge pipe 120, the second pump tank 620, part of the second suction pipe 210, and part of the second discharge pipe 220 are integrally formed in the main part, and the connecting part is formed with the remaining parts of the first suction pipe 110 and the second suction pipe 210, as well as the remaining parts of the first discharge pipe 120 and the second discharge pipe 220.

[0081] The first diaphragm 700 sealing cover is arranged on the first pump groove 610 to form a first pump chamber 100, and the first diaphragm 700 is transmission-connected to the cam 300; the second diaphragm 800 sealing cover is arranged on the second pump groove 620 to form a second pump chamber 200, and the second diaphragm 800 is transmission-connected to the cam 300.

[0082] The first diaphragm 700 and the second diaphragm 800 are both made of Teflon (PTFE) and have a certain elasticity, and can change the volume of the first pump chamber 100 and the second pump chamber 200 under the drive of the cam 300, thereby realizing the suction and discharge of the fluid.

[0083] Reference Figure 3 As shown, in some specific embodiments of the present invention, the pump body 600 also includes a total suction port 630 and a total discharge port 640, the first suction pipe 110 and the second suction pipe 210 are both connected to the total suction port 630, and the first discharge pipe 120 and the second discharge pipe 220 are both connected to the total discharge port 640.

[0084] It is worth to understand that the pump body 600 inhales and discharges the fluid through the same main suction port 630 and the main discharge port 640 to achieve continuous suction and continuous discharge of the constant flow diaphragm pump.

[0085] In this embodiment, the first suction pipe 110 and the second suction pipe 210 are connected to the total suction port 630 within the connecting portion, and the first discharge pipe 120 and the second discharge pipe 220 are connected to the total discharge port 640 within the connecting portion, so that the pump body 600 continuously inhales fluid from the total suction port 630, but the first suction pipe 110 and the second suction pipe 210 inside the pump body 600 alternately inhale fluid; similarly, the pump body 600 continuously discharges fluid from the total discharge port 640, but the first discharge pipe 120 and the second discharge pipe 220 inside the pump body 600 alternately discharge fluid.

[0086] Reference Figure 3 As shown, in some specific embodiments of the present invention, a first one-way valve 650 is provided between the first suction pipe 110 and the first pump chamber 100, and a second one-way valve 660 is provided between the first pump chamber 100 and the first discharge pipe 120; a third one-way valve 670 is provided between the second suction pipe 210 and the second pump chamber 200, and a fourth one-way valve 680 is provided between the second pump chamber 200 and the second discharge pipe 220.

[0087] In this embodiment, the first one-way valve 650, the second one-way valve 660, the third one-way valve 670 and the fourth one-way valve 680 are all arranged in the connecting part, the connecting part has a connecting surface connected to the main body part, the connecting surface has a placement groove connected to the corresponding pipeline, all the one-way valves are respectively arranged in the corresponding placement grooves, and the connecting positions are sealed, so that the connection of the pipelines is more reliable and the installation of the one-way valves is more convenient.

[0088] In addition, the connecting part includes a suction part and a discharge part, the suction part is provided with a first suction pipe 110, a second suction pipe 210, a first one-way valve 650 and a third one-way valve 670, and the discharge part is provided with a first discharge pipe 120, a second discharge pipe 220, a second one-way valve 660 and a fourth one-way valve 680.

[0089] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A constant flow diaphragm pump, characterized in that: include: The first pump chamber and the second pump chamber; The cam comprises a first transmission position and a second transmission position relative to each other, wherein the first transmission position is transmission-connected to the first pump chamber, and the second transmission position is transmission-connected to the second pump chamber, and the cam further comprises a push stroke and a return stroke, wherein the push stroke comprises an initial stroke for increasing flow, a middle stroke for steady flow, and a final stroke for decreasing flow; Among them, when the first pump chamber is in the initial stroke, the second pump chamber is in the final stroke; when the first pump chamber is in the middle stroke, the second pump chamber is in the return stroke; when the first pump chamber is in the final stroke, the second pump chamber is in the initial stroke; when the first pump chamber is in the return stroke, the second pump chamber is in the middle stroke.

2. The constant flow diaphragm pump according to claim 1, characterized in that: The cam can rotate around the axial direction of the cam, and the cam has a transmission circumferential surface, and opposite sides of the transmission circumferential surface respectively have the first transmission position and the second transmission position, and the transmission circumferential surface has the push stroke, the far rest stroke, the return stroke and the near rest stroke sequentially distributed along the circumference of the cam; Among them, within a single rotation cycle of the cam, the movement angle of the push stroke is Φ, and the movement angle of the remote rest stroke is Φ s The return motion angle is Φ', and the near-rest motion angle is Φ' s , the constant flow diaphragm pump satisfies: Φ+Φ s +Φ'+Φ' s =360°, Φ>Φ', 20°≥Φ s ≥0°, 20°≥Φ' s ≥0°.

3. The constant flow diaphragm pump according to claim 2, characterized in that: Φ'+90°≥Φ≥Φ'+70°,Φ s =0°,Φ' s =0°.

4. The constant flow diaphragm pump according to claim 3, characterized in that: Φ=220°,Φ'=140°.

5. The constant flow diaphragm pump according to claim 1, characterized in that: The curve equation of the cam includes: The derivation equation: s=h / 2*(1-cosπφ / Φ) The return equation: s=h / 2*[1+cosπ(φ-Φ-Φ s ) / Φ'] s is the actual stroke of the cam; h is the maximum stroke of the cam; φ is the rotation angle of the cam; Φ is the movement angle of the thrust stroke; Φ' is the movement angle of the return stroke; Φ s is the movement angle of the far resting distance; π is the ratio of a circle to its circumference.

6. The constant flow diaphragm pump according to claim 1, characterized in that: The total flow rate of the first pump chamber in the push stroke is Q1, and the total flow rate of the first pump chamber in the return stroke is Q2; The constant flow diaphragm pump is configured as: Q1=Q2.

7. The constant flow diaphragm pump according to claim 1, characterized in that: The cam is configured so that when the first pump chamber is in the thrust stroke, the first pump chamber discharges fluid; When the first pump chamber is in the return stroke, the first pump chamber sucks in fluid; When the second pump chamber is in the thrust stroke, the second pump chamber discharges fluid; When the second pump chamber is in the return stroke, the second pump chamber sucks in fluid.

8. The constant flow diaphragm pump according to claim 1, characterized in that: The cam is capable of rotating around the axial direction of the cam, and the cam includes a first transmission end face and a second transmission end face relative to each other, the first transmission end face has the first transmission position, the first transmission end face has the push stroke and the return stroke distributed sequentially along the circumference of the cam, the second transmission end face has the second transmission position, and the second transmission end face has the return stroke and the push stroke distributed sequentially along the axial direction of the cam.

9. The constant flow diaphragm pump according to claim 1, characterized in that: The cam, the first pump chamber, and the second pump chamber are sequentially distributed along the first direction.

10. The constant flow diaphragm pump according to claim 2, characterized in that: Also includes: A transmission assembly is connected between the cam, the first pump chamber and the second pump chamber, and the transmission assembly includes a first transmission member and a second transmission member, the first transmission member has a first end and a second end arranged in sequence along the first direction, the second transmission member has a third end and a fourth end arranged in sequence along the first direction, the first end and the third end are elastically abutted against the outer circumferential surface of the cam, the second end is connected to the first pump chamber, and the fourth end is connected to the second pump chamber.

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