Cam transmission pump

Abstract

The invention relates to the technical field of transmission pumps, and discloses a cam transmission pump. The cam transmission pump comprises a plunger assembly and a first driving assembly, and the plunger assembly is provided with a plunger rod reciprocating in the first direction; the first driving assembly comprises a first driving part and a cam, the first driving part is in driving connection with the cam and can drive the cam to rotate, the end of the plunger rod is slidably connected to the outer contour of the cam, the outer contour of the cam comprises an acting section and a reset section which are connected end to end, and the acting section is used for driving the plunger rod to move in the direction away from the cam. The reset section is used for driving the plunger rod to move in the direction close to the cam, and the radian of the acting section is larger than that of the reset section. Due to the fact that the radian of the acting section is larger than that of the reset section, the acting duty ratio of the cam is larger than 50%, and the energy utilization rate is improved. Through cam transmission, rotary driving of the first driving piece is converted into linear reciprocating motion of the plunger rod, and the duty ratio of acting is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission pumps, and in particular to a cam transmission pump. Background Art

[0002] In industry and many specialized fields, plunger pumps are critical fluid delivery and pressure-boosting devices. Their common operating principle is to utilize a slider-crank mechanism to convert the motor's rotary motion into linear reciprocating motion of a plunger. This is then combined with the synchronized opening and closing of two check valves to achieve pressurized liquid delivery.

[0003] However, traditional plunger pumps have significant shortcomings. The slider-crank mechanism causes the plunger's linear velocity to vary sinusoidally, and when the plunger retreats, it enters the boost chamber's water absorption zone, making it unable to pump liquid. This results in a theoretical duty cycle of only 50%, resulting in low energy efficiency.

[0004] Based on this, there is an urgent need for a cam transmission pump to solve the above-mentioned problems. Summary of the Invention

[0005] Based on the above, an object of the present invention is to provide a cam drive pump, which converts the rotational drive of the first drive member into linear reciprocating motion of the plunger rod through cam drive, and improves the duty cycle of work.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A cam driven pump comprising:

[0008] a plunger assembly provided with a plunger rod that reciprocates in a first direction;

[0009] The first drive assembly includes a first drive member and a cam, the first drive member is drivingly connected to the cam, the first drive member can drive the cam to rotate, the end of the plunger rod is slidably connected to the outer contour of the cam, the outer contour of the cam includes a working section and a reset section connected end to end, the working section is used to drive the plunger rod to move in a direction away from the cam, and the reset section is used to drive the plunger rod to move in a direction close to the cam, and the curvature of the working section is greater than the curvature of the reset section.

[0010] As an optimal technical solution for a cam-driven pump, the reset section includes a return section AC, the head end of the return section AC is connected to the tail end of the working section, and the distance between the tail end of the return section AC and the rotation axis of the cam is the same as the distance between the head end of the working section and the rotation axis of the cam.

[0011] As an optimal technical solution for a cam-driven pump, the reset section also includes a waiting section CB, the contour of the waiting section CB is at a constant distance from the rotation axis, and one end of the waiting section CB is connected to the tail end of the return section AC, and the other end is connected to the head end of the working section.

[0012] As an optimal technical solution for a cam drive pump, the return section AC is concave in shape, the tail end of the return section AC is tangent to the head end of the waiting section CB, and the tail end of the waiting section CB is tangent to the head end of the working section.

[0013] As an optimal technical solution for a cam drive pump, the ratio of the arc of the return segment AC to the arc of the waiting segment CB is in the range of 0.5-1.

[0014] As an optimal technical solution for a cam transmission pump, the working section is distributed in the form of an Archimedean spiral.

[0015] As an optimal technical solution for a cam transmission pump, a roller is provided at one end of the plunger rod close to the cam, and the roller is rollingly connected to the outer contour of the cam.

[0016] As an optimal technical solution for a cam-driven pump, the plunger assembly also includes a housing, an inlet check valve and an outlet check valve. The housing is provided with a boosting chamber extending along the first direction. The end of the plunger rod facing away from the cam is sealed and slidably connected to the inner wall of the boosting chamber. The boosting chamber is provided with a water inlet and a water outlet. The inlet check valve is provided at the water inlet, and the outlet check valve is provided at the water outlet.

[0017] As a preferred technical solution for a cam-driven pump, the plunger assembly further comprises an elastic member, which is disposed between the plunger rod and the housing. The elastic force of the elastic member can drive the plunger rod to fit the outer contour of the cam.

[0018] As an optimal technical solution for a cam-driven pump, the cam-driven pump also includes a second drive component, the cam is conical along the extension direction of the rotation axis, the second drive component is driven and connected to the first drive component, and the second drive component is used to drive the first drive component to move back and forth along the direction of the rotation axis.

[0019] As a preferred technical solution of a cam transmission pump, the outer wall of the roller is conical, and the taper of the outer wall of the roller is the same as that of the outer wall of the cam.

[0020] As an optimal technical solution for a cam-driven pump, the first drive assembly also includes a drive seat, the drive seat is provided with a groove, the cam is connected to the bottom of the groove, a guide groove with the same shape as the outer contour is formed between the outer contour of the cam and the inner wall of the groove, and the roller is rollingly connected to the guide groove.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides a cam-driven pump. During operation, a first driving member drives a cam to rotate. The working section, from point B at the head end to point A at the tail end, sequentially slides against the end of a plunger rod. The plunger rod gradually moves away from the cam's rotation axis in a first direction and moves to the pumping position. The plunger assembly pumps liquid through the plunger rod. Then, the reset section, from point A at the head end to point B at the tail end, sequentially slides against the end of the plunger rod. The plunger rod gradually approaches the cam's rotation axis in the first direction and moves to the suction position. The plunger assembly pumps liquid through the plunger rod. The working section of the cam then slides against the end of the plunger rod again, achieving reciprocating cyclic motion of the plunger rod in the first direction. Because the curvature of the working section is greater than that of the reset section, the duty cycle of the cam's work during one rotation of the cam is greater than 50%, thereby improving energy utilization. Through cam transmission, the present invention converts the rotational drive of the first driving member into linear reciprocating motion of the plunger rod, thereby improving the duty cycle of work. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0024] Figure 1 This is a schematic structural diagram of a cam transmission pump provided in Example 1 of the present invention;

[0025] Figure 2 is a structural schematic diagram of a cam provided in the first embodiment of the present invention;

[0026] Figure 3 is a cross-sectional view of a cam drive pump provided in Example 1 of the present invention;

[0027] Figure 4 This is a comparison chart of the water pumping speed of the present invention and the conventional crank slider mechanism;

[0028] Figure 5 This is a comparison chart of the plunger speeds of the present invention and a conventional slider-crank mechanism;

[0029] Figure 61 is a schematic structural diagram of a cam transmission pump provided in a second embodiment of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the cam transmission pump provided in Example 3 of the present invention.

[0031] The following are marked in the figure:

[0032] 1. Plunger assembly; 11. Plunger rod; 111. Push rod; 1111. Limiting protrusion; 112. Plunger; 113. Locking sleeve; 114. Sealing ring; 12. Housing; 121. Pressurization chamber; 122. Water inlet; 123. Water outlet; 13. Water inlet check valve; 14. Water outlet check valve; 15. Roller; 16. Elastic member;

[0033] 2. First drive assembly; 21. First drive member; 22. First fixing plate; 23. Drive seat; 231. Guide groove;

[0034] 3. Cam; 31. Working section; 32. Reset section; 321. Return section AC; 322. Waiting section CB;

[0035] 4. Second drive assembly; 41. Second fixing plate; 42. Second drive member; 43. Guide rail; 44. Connecting plate; 45. Lead screw; 46. Lead screw nut. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0037] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0040] Example 1

[0041] like Figure 1 and Figure 2 As shown, this embodiment provides a cam drive pump, which includes a plunger assembly 1 and a first drive assembly 2. The plunger assembly 1 is provided with a plunger rod 11 that reciprocates along a first direction; the first drive assembly 2 includes a first drive member 21 and a cam 3. The first drive member 21 is driven and connected to the cam 3, and the first drive member 21 can drive the cam 3 to rotate. The end of the plunger rod 11 is slidably connected to the outer contour of the cam 3. The outer contour of the cam 3 includes a working section 31 and a reset section 32 connected end to end. The working section 31 is used to drive the plunger rod 11 to move away from the cam 3, and the reset section 32 is used to drive the plunger rod 11 to move toward the cam 3. The curvature of the working section 31 is greater than the curvature of the reset section 32.

[0042] During operation, the first drive member 21 drives the cam 3 to rotate, and the working section 31 slides sequentially from the head end point B to the tail end point A to fit the end of the plunger rod 11. The plunger rod 11 gradually moves away from the rotation axis of the cam 3 along the first direction and moves to the pump liquid level. The plunger assembly 1 pumps liquid through the plunger rod 11, and then the reset section 32AB slides sequentially from the head end point A to the tail end point B to fit the end of the plunger rod 11. The plunger rod 11 gradually approaches the rotation axis of the cam 3 along the first direction and moves to the suction position. The plunger assembly 1 pumps liquid through the plunger rod 11, and then the working section 31 of the cam 3 slides again to fit the end of the plunger rod 11, realizing the reciprocating cyclic motion of the plunger rod 11 along the first direction. Since the curvature of the working section 31 is greater than the curvature of the reset section 32AB, when the cam 3 rotates one circle, the duty cycle of the cam 3's work is greater than 50%, thereby improving energy utilization. The present invention converts the rotational drive of the first driving member 21 into the linear reciprocating motion of the plunger rod 11 through the transmission of the cam 3, thereby improving the duty cycle of the work.

[0043] Furthermore, the reset section 32 includes a return section AC321. The head end of the return section AC321 is connected to the tail end of the working section 31. The distance between the tail end of the return section AC321 and the rotation axis of the cam 3 is the same as the distance between the head end of the working section 31 and the rotation axis of the cam 3. The contour of the working section 31 gradually moves away from the rotation axis of the cam 3, while the contour of the return section AC321 gradually moves closer to the rotation axis of the cam 3. When the head end A to the tail end C of the return section AC321 sequentially slide against the end of the plunger rod 11, the plunger rod 11 moves from the pumping position to the suction position.

[0044] Further preferably, the reset section 32 further includes a waiting section CB322. The distance between the outline of the waiting section CB322 and the rotation axis remains constant, and one end of the waiting section CB322 is connected to the tail end of the return section AC321, and the other end is connected to the head end of the working section 31. When the end of the plunger rod 11 is slidably connected to the outer contour of the reset section 32, it first passes through the return section AC321, thereby enabling the plunger rod 11 to quickly move to the suction position and increase the reset speed. At this time, the suction pressure in the boosting chamber 121 of the plunger assembly 1 is relatively high, achieving rapid suction of the liquid and increasing the suction speed. When the end of the plunger rod 11 passes through the waiting section CB322, the position of the plunger rod 11 remains unchanged, allowing the plunger assembly 1 to maintain the suction state under the condition of relatively high suction pressure, quickly sucking more liquid.

[0045] Further preferably, the return section AC321 has a concave shape, with the tail end of the return section AC321 tangent to the head end of the waiting section CB322, and the tail end of the waiting section CB322 tangent to the head end of the working section 31. When the plunger rod 11 is slidably connected to the concave return section AC321, the plunger rod 11 can be quickly reset. Because the tail end of the return section AC321 is tangent to the head end of the waiting section CB322, and the tail end of the waiting section CB322 is tangent to the head end of the working section 31, the smoothness of the movement of the plunger rod 11 is improved when the contact area between the plunger rod 11 and the cam 3 transitions from the return section AC321 to the waiting section CB322, and when the waiting section CB322 transitions to the working section 31.

[0046] Preferably, the ratio of the arc of the return segment AC321 to the arc of the waiting segment CB322 is in the range of 0.5-1. In this embodiment, the ratio of the arc of the return segment AC321 to the arc of the waiting segment CB322 can be 0.5, 0.6, 0.7, 0.8, 0.9, or 1. The ratio of the arc of the return segment AC321 to the arc of the waiting segment CB322 should not be too small. If the return segment AC321 is too small, although the return speed of the plunger rod 11 can be increased, when the return speed is too large, the impact force of the plunger rod 11 on the cam 3 will increase. The ratio of the arc of the return segment AC321 to the arc of the waiting segment CB322 should not be too large. If the return segment AC321 is too large, the plunger rod 11 will return more slowly, reducing the suction pressure and the time the plunger rod 11 is in the suction position. This in turn reduces the volume of liquid pumped each time, failing to meet the demand.

[0047] In the prior art, pumps using a crank-slider structure do not operate at a uniform speed during the pumping process, which can cause significant pulsation in the output liquid flow rate. In this embodiment, the working section 31 is arranged in an Archimedean spiral, and the radius of the curve of the working section 31 steadily increases with the angle. When the working section 31 drives the plunger rod 11 from the suction position to the pump liquid position, the plunger rod 11 moves at a uniform speed, thereby achieving liquid boosting pumping with a relatively stable flow rate.

[0048] In this embodiment, the curvilinear coordinate equation of the working section 31 is:

[0049] X(θ)=(R0+h / θ)*cos(θ);

[0050] y(θ)=(R0+h*θ)*sin(θ);

[0051] Where θ is the radian of clockwise rotation of the cam 3 (unit: rad), and the angle of the working section 31 converted to an angle interval is a°. R0 is the starting radius of the working section 31, and h is the radius increment of the working section 31 (the radius increase per radian). It should be noted that the distribution equation of the Archimedean spiral is prior art.

[0052] Furthermore, if Figure 3 As shown, the plunger assembly 1 further includes a housing 12, a water inlet check valve 13, and a water outlet check valve 14. The housing 12 is provided with a pressurizing chamber 121 extending along a first direction. The end of the plunger rod 11 facing away from the cam 3 is sealed and slidably connected to the inner wall of the pressurizing chamber 121. The pressurizing chamber 121 is provided with a water inlet 122 and a water outlet 123. The water inlet check valve 13 is provided at the water inlet 122, and the water outlet check valve 14 is provided at the water outlet 123. When the plunger rod 11 moves to the suction position, the liquid enters the pressurizing chamber 121 through the water inlet 122 and the water inlet check valve 13. When the plunger rod 11 moves to the pump position, the liquid in the pressurizing chamber 121 is discharged through the water outlet check valve 14 and the water outlet 123, thereby realizing the pumping of the liquid.

[0053] In this embodiment, a roller 15 is provided at one end of the plunger rod 11 close to the cam 3. The roller 15 is rollingly connected to the outer contour of the cam 3, reducing the friction between the plunger rod 11 and the cam 3, reducing mutual wear between the two, and facilitating relative movement between the two.

[0054] In this embodiment, the plunger rod 11 includes a push rod 111, a plunger 112, and a locking sleeve 113. The locking sleeve 113 secures the plunger 112 to one end of the push rod 111 located in the pressurization chamber 121. The plunger 112 is sealingly and slidably connected to the inner wall of the pressurization chamber 121. The other end of the push rod 111 is slidably connected to the outer contour of the cam 3. When the push rod 111 moves in a first direction, the plunger 112 moves synchronously. A sealing ring 114 is provided on the outer wall of the plunger 112, achieving a seal between the plunger 112 and the pressurization chamber 121. Water is drawn in through the water inlet 122 in conjunction with the water inlet and outlet check valves 13 and 14, and is pumped out through the water outlet 123 after being pressurized.

[0055] Furthermore, the plunger assembly 1 further includes an elastic member 16, which is disposed between the plunger rod 11 and the housing 12. The elastic force of the elastic member 16 can drive the plunger rod 11 to conform to the outer contour of the cam 3. In this embodiment, the elastic member 16 is a spring. A limiting protrusion 1111 is provided on the outer wall of the plunger rod 11. The spring is sleeved on the plunger rod 11 with one end abutting the limiting protrusion 1111 and the other end abutting the outer wall of the housing 12. The spring applies an elastic force to the plunger rod 11 so that the end of the plunger rod 11 always conforms to the outer contour of the cam 3.

[0056] It should be noted that when the cam drive pump needs to output different flow rates, the rotational speed of the cam 3 is adjusted according to the demand. However, the elastic force of the elastic member 16 does not change with the rotational speed of the cam 3. Therefore, it can be considered that the time for the elastic member 16 to push the plunger rod 11 back from the distal end is fixed, but the contact time between the reset section 32 of the cam 3 and the plunger rod 11 is variable. At high speeds, after the plunger rod 11 returns, the cam 3 has already rotated past the reset section 32 and directly enters the working section 31. This will cause the reciprocating stroke of the plunger rod 11 to be shortened, the pumping volume to be reduced, and it is not conducive to controlling the flow rate accuracy. Therefore, this embodiment sets a waiting section CB322 for waiting for the plunger rod 11 to return, ensuring that the plunger rod 11 has returned before entering the working section 31, and ensuring that the reciprocating stroke of the plunger rod 11 meets the requirements.

[0057] In this embodiment, the first drive component 2 also includes a first fixed plate 22, the first drive component 21 is a motor, the first fixed plate 22 is connected to the shell 12, the motor is fixed on the first fixed plate 22, the first fixed plate 22 is provided with a through hole, the output shaft of the motor is passed through the through hole and connected to the cam 3.

[0058] This embodiment also provides the working principle of the cam transmission pump, the push rod 111 slides back and forth in the first direction under the limit of the boost chamber 121, and the elastic member 16 drives the roller 15 of the push rod 111 to always fit the outer contour of the cam 3. When the cam 3 rotates clockwise under the drive of the motor, when the cam 3 rotates to the working section 31 and contacts the plunger rod 11, the distance between the edge of the cam 3 and the rotation axis begins to increase, driving the plunger rod 11 to move from the suction position to the pump liquid level. When the cam 3 rotates to the reset section 32 and contacts the plunger rod 11, the distance between the edge of the cam 3 and the rotation axis begins to decrease, and the push rod 111 is pushed back by the elastic member 16 and maintains contact with the reset section 32 of the cam 3. The reset section 32 of the cam 3 cooperates with the elastic member 16 to drive the plunger rod 11 from the pump liquid level to the suction position.

[0059] like Figure 4 As shown, when the plunger rod 11 has the same travel distance, the boost chamber 121 has the same volume and the cam 3 has the same rotation speed, the pumping speed of this embodiment is compared with that of the common crank slider mechanism, and the duty cycle of the work done by this embodiment is higher. Figure 5 As shown, when the plunger rod 11 movement stroke, the boost chamber 121 volume and the cam 3 rotation speed are the same, the plunger speed of this embodiment is compared with that of the common crank slider mechanism. The plunger speed of this embodiment is more stable and the return time is short.

[0060] Example 2

[0061] like Figure 6As shown, this embodiment provides a cam transmission pump. The structure of the cam transmission pump provided in this embodiment is basically the same as that of the embodiment 1. This embodiment will not repeat the structure that is the same as that of the embodiment 1.

[0062] In the prior art, when the cam 3 rotates at high speed, the plunger rod 11 returns too quickly, shortening the time it takes for the pressurized chamber 121 to fill with liquid, potentially leading to air blockage. To address this issue, in this embodiment, the cam-driven pump further includes a second drive assembly 4. The cam 3 is tapered along the axis of rotation. The second drive assembly 4 is drivably connected to the first drive assembly 2 and is configured to drive the first drive assembly 2 to reciprocate along the axis of rotation.

[0063] Among them, when the second drive assembly 4 drives the first drive assembly 2 to move back and forth along the direction of the rotation axis, the position of the plunger rod 11 remains unchanged, and the different outer walls of the cam 3 along the extension direction of the rotation axis contact the plunger rod 11. When the outer wall of the cam 3 with a larger cross-sectional profile contacts the plunger rod 11, the stroke of the plunger rod 11 can be reduced; conversely, when the outer wall of the cam 3 with a smaller cross-sectional profile contacts the plunger rod 11, the stroke of the plunger rod 11 can be increased, thereby realizing the adjustment of the stroke of the plunger rod 11. By making the stroke of the plunger rod 11 adjustable, when a small flow rate is required, the speed of the cam 3 can be reduced while reducing the stroke of the plunger rod 11. When a large flow rate is required, the speed of the cam 3 can be increased and the stroke of the plunger rod 11 can be increased.

[0064] Preferably, the outer wall of the roller 15 is tapered, and the taper of the outer wall of the roller 15 is the same as that of the outer wall of the cam 3, so that the outer wall of the roller 15 can fit the outer wall of the cam 3, thereby improving the stability of the connection between the two.

[0065] In this embodiment, the second drive assembly 4 includes a second fixed plate 41 and a second drive member 42. The second fixed plate 41 is connected to the housing 12 of the plunger assembly 1. The second drive member 42 is fixed on the second fixed plate 41. The second drive member 42 is driven and connected to the first drive member 21. The second drive member 42 is used to drive the first drive member 21 to move along the direction of the rotation axis of the cam 3.

[0066] Specifically, the second drive assembly 4 further includes a guide rail 43, a connecting plate 44, a lead screw 45, and a lead screw nut 46. The guide rail 43 extends along the direction of the rotation axis of the cam 3 and is fixed to the second fixing plate 41. The connecting plate 44 is slidably connected to the guide rail 43. The second drive member 42 is a motor. The output end of the motor is connected to the lead screw 45, and the lead screw 45 is threadedly connected to the lead screw nut 46. When the output end of the motor rotates, it can threadably drive the lead screw nut 46, the connecting plate 44, the first drive member 21, and the cam 3 to move along the direction of the rotation axis of the cam 3, thereby adjusting the stroke of the plunger rod 11. In other embodiments, the second drive member 42 can also be a cylinder.

[0067] Example 3

[0068] like Figure 7 As shown, this embodiment provides a cam transmission pump. The structure of the cam transmission pump provided in this embodiment is basically the same as that of the embodiment 1. This embodiment will not repeat the structure that is the same as that of the embodiment 1.

[0069] In this embodiment, the first drive assembly 2 further includes a drive seat 23 having a groove. The cam 3 is connected to the bottom of the groove. A guide groove 231 having the same shape as the outer contour of the cam 3 and the inner wall of the groove is formed between the outer contour of the cam 3 and the inner wall of the groove. The roller 15 is rollingly connected to the guide groove 231. By providing the guide groove 231, the elastic member 16 can be eliminated. The forward and return strokes of the plunger rod 11 can be driven by the guide groove 231, making the operation of the entire mechanism more stable.

[0070] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A cam drive pump, characterized in that: include: A plunger assembly (1) is provided with a plunger rod (11) that reciprocates in a first direction; A first driving assembly (2) comprises a first driving member (21) and a cam (3), wherein the first driving member (21) is drivingly connected to the cam (3), and the first driving member (21) can drive the cam (3) to rotate, and the end of the plunger rod (11) is slidably connected to the outer contour of the cam (3), and the outer contour of the cam (3) comprises a working section (31) and a reset section (32) connected end to end, the working section (31) is used to drive the plunger rod (11) to move in a direction away from the cam (3), and the reset section (32) is used to drive the plunger rod (11) to move in a direction close to the cam (3), and the curvature of the working section (31) is greater than the curvature of the reset section (32).

2. The cam driven pump according to claim 1, characterized in that The reset section (32) comprises a return section AC (321), the head end of the return section AC (321) is connected to the tail end of the working section (31), and the distance between the tail end of the return section AC (321) and the rotation axis of the cam (3) is the same as the distance between the head end of the working section (31) and the rotation axis of the cam (3).

3. The cam driven pump according to claim 2, characterized in that The reset section (32) further includes a waiting section CB (322), the profile of which is at a constant distance from the rotation axis, and one end of the waiting section CB (322) is connected to the tail end of the return section AC (321), and the other end is connected to the head end of the working section (31).

4. The cam driven pump according to claim 3, characterized in that The return section AC (321) is in a concave shape, the tail end of the return section AC (321) is tangent to the head end of the waiting section CB (322), and the tail end of the waiting section CB (322) is tangent to the head end of the working section (31).

5. The cam driven pump according to claim 3, characterized in that The ratio of the arc angle of the return segment AC (321) to the arc angle of the waiting segment CB (322) is in the range of 0.5-1.

6. The cam driven pump according to claim 1, characterized in that The working section (31) is distributed in an Archimedean spiral.

7. The cam driven pump according to claim 1, wherein: A roller (15) is provided at one end of the plunger rod (11) close to the cam (3), and the roller (15) is rollingly connected to the outer contour of the cam (3).

8. The cam driven pump according to claim 1, wherein: The plunger assembly (1) further comprises a housing (12), a water inlet one-way valve (13) and a water outlet one-way valve (14); the housing (12) is provided with a pressurizing chamber (121) extending along the first direction; the end of the plunger rod (11) facing away from the cam (3) is sealed and slidably connected to the inner wall of the pressurizing chamber (121); the pressurizing chamber (121) is provided with a water inlet (122) and a water outlet (123); the water inlet one-way valve (13) is provided at the water inlet (122), and the water outlet one-way valve (14) is provided at the water outlet (123).

9. The cam driven pump according to claim 8, characterized in that The plunger assembly (1) further comprises an elastic member (16), wherein the elastic member (16) is arranged between the plunger rod (11) and the housing (12), and the elastic force of the elastic member (16) can drive the plunger rod (11) to fit the outer contour of the cam (3).

10. The cam driven pump according to claim 7, characterized in that The cam drive pump further comprises a second drive assembly (4), wherein the cam (3) is tapered along the extension direction of the rotation axis, and the second drive assembly (4) is drivingly connected to the first drive assembly (2), and the second drive assembly (4) is used to drive the first drive assembly (2) to move back and forth along the direction of the rotation axis.

11. The cam driven pump according to claim 10, characterized in that The outer wall of the roller (15) is tapered, and the outer wall of the roller (15) has the same taper as the outer wall of the cam (3).

12. The cam driven pump according to claim 7, wherein: The first drive assembly (2) further comprises a drive seat (23), the drive seat (23) being provided with a groove, the cam (3) being connected to the groove bottom of the groove, a guide groove (231) having the same shape as the outer contour as that of the outer contour being formed between the outer contour of the cam (3) and the inner wall of the groove, and the roller (15) being rollingly connected to the guide groove (231).

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