Electric fluid pump and method for fluid pumping using electric fluid pump

Abstract

An electric fluid pump (100) and a method for fluid pumping using the electric fluid pump (100). The electric fluid pump (100) comprises a driving device (110) and a pumping device. The driving device (110) comprises a rotor (111), the rotor (111) being configured to perform a rotational motion about its axis of rotation. The pumping device comprises a fluid displacement member (120) and a transmission assembly (130), wherein the fluid displacement member (120) is configured to be driven to perform a reciprocating motion for fluid pumping; and the transmission assembly (130) is connected to each of the rotor (111) and the fluid displacement member (120), and the transmission assembly (130) is configured to convert the unidirectional rotational motion of the rotor (111) into the linear reciprocating motion of the fluid displacement member (120).

Description

Electric fluid pump and method of pumping fluid using the electric fluid pump Technical Field

[0001] This invention relates to the field of fluid pumping, and more particularly to an electric fluid pump and a method for pumping fluids using the electric fluid pump. Background Technology

[0002] Fluid transfer devices, such as electric diaphragm pumps, are crucial equipment in the production and manufacturing of chemicals, pharmaceuticals, coal mines, and semiconductors. Existing electric diaphragm pumps mainly consist of a motor, reducer, crank mechanism, and diaphragm. During operation, the motor generates rotational motion, which is reduced to a predetermined speed by the reducer. Then, the crank or cam mechanism converts the rotational motion into linear reciprocating motion, driving the diaphragm in the pump body to reciprocate, thus creating suction and discharge. This type of pump has a complex design, low efficiency, large and bulky size, and high cost, making it difficult to install, transport, and maintain.

[0003] Therefore, there is a need to provide an electric fluid pump and a method for pumping fluid using the electric fluid pump, in order to at least partially solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide an electric fluid pump and a method for pumping fluid using the electric fluid pump, which can reduce the energy consumption of the electric fluid pump, improve its overall working efficiency, and reduce the number of parts, thereby reducing the overall size and weight of the electric fluid pump.

[0005] According to one aspect of this application, an electric fluid pump is provided, the electric fluid pump comprising:

[0006] A drive device, the drive device including a rotor configured to rotate about its axis of rotation; and

[0007] Pumping device, the pumping device comprising:

[0008] A fluid displacement member configured to be driven to reciprocate for pumping fluid; and

[0009] A transmission assembly is connected to the rotor and the fluid displacement member respectively, and the transmission assembly is configured to convert the unidirectional rotational motion of the rotor into the linear reciprocating motion of the fluid displacement member.

[0010] Preferably, the transmission assembly includes:

[0011] A lead screw assembly connected to the rotor and configured to be driven by the rotor to perform synchronized unidirectional rotational motion, the lead screw assembly having guide grooves formed on its outer periphery; and

[0012] A nut component, connected to the fluid displacement member, includes a slider movably disposed in the guide groove.

[0013] The guide groove is arranged such that when the lead screw component is driven to perform the unidirectional rotational motion, the sliding member can perform linear reciprocating motion along the axial direction of the lead screw component.

[0014] Preferably, the lead screw component is arranged coaxially with the rotor.

[0015] Preferably, the guide groove extends in both the circumferential and axial directions of the lead screw component, the guide groove being continuous and closed-loop in the circumferential direction, and having a predetermined extension length in the axial direction.

[0016] Preferably, the guide groove includes a first guide groove and a second guide groove, wherein a first end and a second end of the first guide groove are respectively connected to a first end and a second end of the second guide groove.

[0017] Preferably, the distance between the first end of the first guide groove and the second end of the first guide groove in the axial direction is equal to the predetermined extension length, and the distance between the first end of the second guide groove and the second end of the second guide groove in the axial direction is equal to the predetermined extension length.

[0018] Preferably, the guide groove is configured such that when the lead screw component performs the unidirectional rotational motion: when the slider moves in the first guide groove, it performs linear motion in a first direction, and when the slider moves in the second guide groove, it performs linear motion in a second direction opposite to the first direction.

[0019] Preferably, the first guide groove and the second guide groove are arranged symmetrically with respect to the axial center plane of the lead screw component.

[0020] Preferably, the first guide groove and the second guide groove each include a bent section, such that when the lead screw component performs the unidirectional rotational motion: when the slider moves in the first guide groove, it performs linear reciprocating motion in a first direction and a second direction opposite to the first direction, and when the slider moves in the second guide groove, it performs linear reciprocating motion in the first direction and the second direction.

[0021] Preferably, the slider includes balls or rollers slidably disposed in the guide groove.

[0022] Preferably, both the first guide groove and the second guide groove are constructed as spiral grooves, and the spiral direction of the first guide groove is opposite to that of the second guide groove.

[0023] Preferably, the lead screw has multiple corners, which are arranged sequentially along the axial direction of the lead screw, and two adjacent corners are arranged opposite each other relative to the central axis of the lead screw, and the hypotenuse of the corner forms the groove edge of the guide groove.

[0024] Preferably, the corner portion is constructed as a parallelogram structure in the unfolded configuration, wherein a pair of parallel hypotenuses of the corner portion forms the spiral edge of one of the first guide grooves and the second guide groove, and another pair of parallel hypotenuses of the corner portion forms the spiral edge of the other of the first guide grooves and the second guide groove.

[0025] Preferably, the slider includes a sliding pin having an arcuate contact surface for engaging with the guide groove.

[0026] Preferably, the nut component further includes a connecting device fixedly connected to the fluid displacement member. The connecting device includes a first connecting portion and a second connecting portion connected to the first connecting portion. The first connecting portion is sleeve-shaped and sleeved on the end of the lead screw component. The first connecting portion is configured to move on the lead screw component along the axial direction of the lead screw component. The outer wall of the first connecting portion has a first hole and the end is provided with a second hole. The fluid displacement member is provided with a third hole. A portion of the sliding member is embedded in the first hole. The second connecting portion is columnar and its two ends are respectively installed to the second hole and the third hole.

[0027] Preferably, the fluid displacement component includes a diaphragm.

[0028] Preferably, the central axis of the diaphragm coincides with the rotation axis of the rotor.

[0029] Preferably, the rotor and the lead screw are formed as a single unit, or the rotor and the lead screw are the same component.

[0030] Preferably, the driving device is a permanent magnet synchronous direct drive motor.

[0031] Preferably, the electric fluid pump includes two pumping devices, which are respectively disposed at both ends of the rotor along the axial direction of the rotor.

[0032] Preferably, each of the pumping devices includes a fluid displacement component and a set of transmission components, with the two sets of transmission components respectively connected to both ends of the rotor, and the two fluid displacement components respectively connected to both ends of the two sets of transmission components.

[0033] Preferably, the rotor is configured to:

[0034] The two nut components are driven to move linearly in a first direction to drive one of the two fluid displacement components to perform a suction stroke and simultaneously drive the other of the two fluid displacement components to perform a pumping stroke.

[0035] The two nut components are driven to move linearly in a second direction opposite to the first direction, so as to drive one of the two fluid displacement components to perform a pumping stroke and synchronously drive the other of the two fluid displacement components to perform a suction stroke.

[0036] According to one aspect of this application, a method for fluid pumping using an electric fluid pump as described above is provided, the method comprising:

[0037] Drive the rotor to rotate in one direction; and

[0038] In response to the unidirectional rotation of the rotor, the fluid displacement member performs linear reciprocating motion for pumping and suction strokes.

[0039] According to the embodiments of this application, an electric fluid pump and a method for pumping fluid using the electric fluid pump have a transmission assembly connected to both the rotor of a motor and a fluid displacement member. That is, the rotor of the motor is directly connected to the transmission assembly without a speed reducer, and the transmission assembly is then connected to the fluid displacement member. This design reduces the cost and weight of the electric fluid pump. Furthermore, the transmission assembly can convert the unidirectional rotational motion of the rotor into the linear reciprocating motion of the fluid displacement member. In other words, when the electric fluid pump starts, the rotor rotates in only one direction, enabling the fluid displacement member to perform linear reciprocating motion. This design reduces the energy consumption of the electric fluid pump and improves its operating efficiency. Attached Figure Description

[0040] To better understand the above and other objects, features, advantages, and functions of this application, reference can be made to the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of this application and are not intended to limit the scope of this application.

[0041] Figure 1 is a perspective view of an electric fluid pump according to a first preferred embodiment of the present invention;

[0042] Figure 2 is a side view of the electric fluid pump shown in Figure 1;

[0043] Figure 3 is a schematic diagram of the cross-section of the electric fluid pump shown in Figure 2 along line AA;

[0044] Figure 4 is a three-dimensional schematic diagram of a part of the drive device and transmission assembly of the electric fluid pump shown in Figure 1.

[0045] Figure 5 is a side view of the electric fluid pump shown in Figure 4;

[0046] Figure 6 is a schematic diagram of the cross-section of the electric fluid pump shown in Figure 5 along line BB;

[0047] Figure 7 is a top view of the electric fluid pump shown in Figure 4;

[0048] Figure 8 is a front view of the electric fluid pump shown in Figure 4;

[0049] Figure 9 is a perspective view of a portion of the drive device and transmission assembly of an electric fluid pump according to a second preferred embodiment of the present invention.

[0050] Figure 10 is a three-dimensional schematic diagram of the lead screw of the transmission assembly shown in Figure 9;

[0051] Figure 11 is a three-dimensional schematic diagram of the lead screw shown in Figure 10 from another angle;

[0052] Figure 12 is a three-dimensional schematic diagram of the sliding component of the transmission assembly shown in Figure 9. Detailed Implementation

[0053] Now, with reference to the accompanying drawings, specific embodiments of this application will be described in detail. The embodiments described herein are merely preferred embodiments based on this application; those skilled in the art can conceive of other ways to implement this application based on the preferred embodiments, and such other ways also fall within the scope of this application.

[0054] First, it should be noted that the directional and positional terms used in this application should be understood as relative directions and positions, rather than absolute directions and positions.

[0055] Implementation Method 1

[0056] This application discloses an electric fluid pump 100 and a method for pumping fluid using the electric fluid pump 100. As shown in Figures 1-3, the electric fluid pump 100 includes a housing 140 and a drive device 110 and a pumping device disposed within the housing 140. An outlet manifold 140a and an inlet manifold 140b are respectively disposed above and below the housing 140. A fluid chamber 150 is also disposed on the side of the housing 140, which can communicate with the inlet manifold 140b and the outlet manifold 140a respectively. The fluid chamber 150 is a closed chamber, which is at least partially defined by a fluid cover 151 and a fluid displacement member 120 (described below).

[0057] As shown in Figure 3, the drive device 110 is constructed as a motor, which includes a stator 112 and a rotor 111. The rotor 111 is capable of rotating about a rotation axis XX, which coincides with the axial center line of the rotor 111. In a preferred embodiment according to this application, the drive device 110 is constructed as a permanent magnet synchronous direct drive motor (hereinafter referred to as "motor"). Permanent magnet synchronous direct drive motors are highly efficient, can directly drive loads without a reduction gear, and are small in size, low in noise, and more reliable in operation.

[0058] The pumping device includes a drive assembly 130 and a fluid displacement member 120. The drive assembly 130 is connected to the rotor 111 and the fluid displacement member 120, such that the motion of the rotor 111 can be transmitted to the fluid displacement member 120 via the drive assembly 130. The drive assembly 130 converts the unidirectional rotational motion of the rotor 111 into the linear reciprocating motion of the fluid displacement member 120. That is, when the rotor 111 rotates in a single direction, either clockwise or counterclockwise, the fluid displacement member 120 is driven by the drive assembly 130 to perform linear reciprocating motion, cyclically performing suction and pumping strokes, thereby achieving fluid suction and pumping. During the suction stroke, the fluid displacement member 120 draws fluid from the lower inlet manifold 140b into the fluid chamber 150. During the pumping stroke, the fluid displacement member 120 drives fluid from the fluid chamber 150 to the upper outlet manifold 140a. Compared with the traditional method where the rotor needs to rotate in both clockwise and counterclockwise directions to achieve linear reciprocating motion of the component, the method in this application where the rotor 111 only needs to rotate in one direction to achieve linear reciprocating motion of the fluid displacement component 120 can significantly reduce the energy consumption of the electric fluid pump and improve the operating efficiency, because there is no need to stop the rotor midway and switch to the other opposite direction of rotation.

[0059] The fluid displacement member 120 can take the form of any device suitable for fluid pumping. In the illustrated embodiment, the fluid displacement member 120 is a diaphragm, which can be made of a flexible material such as rubber. The electric fluid pump 100 will be described below with the fluid displacement member 120 as a diaphragm as an example. It will be understood that in other embodiments, the fluid displacement member 120 can also be other suitable devices such as a piston.

[0060] The rotor 111 of the motor is directly connected to the transmission assembly 130, and the diaphragm is also directly connected to the transmission assembly 130. No intermediate gear components (e.g., reducers) are placed between the rotor 111 and the transmission assembly 130, or between the diaphragm and the transmission assembly 130. This design significantly reduces the overall size and weight of the electric fluid pump 100, lowers the noise level during operation, and reduces costs.

[0061] In a preferred embodiment, as shown in Figures 3-8, the transmission assembly 130 includes a lead screw component 131 and a nut component 132 connected to the lead screw component 131. The lead screw component 131 is generally rod-shaped, and one end is fixedly connected to the rotor 111 so that the lead screw component 131 can be driven by the rotor 111 to rotate synchronously with the rotor 111. A guide groove 131a is formed on the outer periphery of the lead screw component 131. Preferably, the lead screw component 131 and the rotor 111 can be independent components, but they can be integrally connected together by welding or other means, or the lead screw component 131 can be the same single component as the rotor 111.

[0062] More preferably, the lead screw component 131 is arranged coaxially with the rotor 111, that is, the axial center of the lead screw component 131 coincides with the axial center of the rotor 111. Furthermore, preferably, the central axis of the diaphragm coincides with the axial centerline (i.e., the rotation axis XX) of the rotor 111, thereby ensuring that the rotor 111, lead screw component 131, and diaphragm are arranged coaxially. This design can further reduce the overall volume of the electric fluid pump 100, making the overall structure of the electric fluid pump 100 more compact.

[0063] The nut component 132 includes a connecting device 133 and a sliding member 132a connected to the connecting device 133. The sliding member 132a is movably disposed in the guide groove 131a, and the connecting device 133 is fixedly connected to the diaphragm. The guide groove 131a is arranged such that when the lead screw component 131 is driven to perform unidirectional rotational motion, the sliding member 132a can perform linear reciprocating motion along the axial direction of the lead screw component 131. The structure of the guide groove 131a will be described in detail below.

[0064] As shown in Figures 3 and 6, in a preferred embodiment, the connecting device 133 includes a first connecting portion 134, which is sleeve-shaped and fitted onto the end of the lead screw component 131. The outer wall of the first connecting portion 134 has a first hole 136. A portion of the sliding member 132a is disposed in the guide groove 131a, and another portion is embedded in the first hole 136, allowing the first connecting portion 134 to move synchronously with the sliding member 132a along the axial direction of the lead screw component 131. The sliding member 132a can be configured, for example, as a ball or roller slidably disposed in the guide groove 131a. To prevent the sliding member 132a from shifting in the first hole 136, preferably, as shown in Figures 3-6, a fastening member 136a is also provided in the first hole 136. This fastening member 136a abuts against the sliding member 132a radially outward, thereby increasing the stability of the sliding member 132a in the first hole 136.

[0065] The connecting device 133 further includes a second connecting portion 135, which is generally columnar and connected at both ends to the first connecting portion 134 and the diaphragm, respectively. As shown in Figures 3 and 6, the end of the first connecting portion 134 is provided with a second hole 137, and the diaphragm is provided with a third hole 138. The second connecting portion 135 is fixedly connected to the second hole 137 and the third hole 138, thereby enabling both the second connecting portion 135 and the diaphragm to move together with the first connecting portion 134 in the axial direction of the lead screw component 131.

[0066] The structure of the guide groove 131a on the lead screw component 131 will be described in detail below.

[0067] As shown in Figures 7 and 8, the guide groove 131a extends in both the circumferential and axial directions of the lead screw component 131, and has a predetermined extension length in the axial direction. The guide groove 131a is continuous and arranged in a closed loop in the circumferential direction, that is, the groove shape of the guide groove 131a is complete, cyclic and continuous in the circumferential direction.

[0068] As shown in Figure 7, the guide groove 131a is composed of a first guide groove 131b and a second guide groove 131c. The first guide groove 131b and the second guide groove 131c are arranged symmetrically with respect to the axial center plane of the lead screw component 131. The first end and the second end of the first guide groove 131b are respectively connected to and communicate with the first end and the second end of the second guide groove 131c. The first guide groove 131b and the second guide groove 131c together constitute a guide groove 131a that is continuous and arranged in a closed loop in the circumferential direction.

[0069] In a preferred embodiment, the distance between the first end and the second end of the first guide groove 131b in the axial direction of the lead screw component 131 is equal to the predetermined extension length of the guide groove 131a, and the distance between the first end and the second end of the second guide groove 131c in the axial direction is equal to the predetermined extension length of the guide groove 131a.

[0070] In the preferred embodiment illustrated, both the first guide groove 131b and the second guide groove 131c extend smoothly from their respective first ends to their second ends along the axial direction. This allows the slider 132a to move linearly in a first direction when the lead screw component 131 is driven to rotate unidirectionally, and to move linearly in a second direction opposite to the first direction when it moves in the first guide groove 131b, and in a second direction opposite to the first direction when it moves in the second guide groove 131c. Thus, when the lead screw component 131 is driven to rotate one revolution, the slider 132a drives the diaphragm through the connecting device 133 to complete a full stroke including one suction stroke and one pumping stroke. The terms "first direction" and "second direction" as used herein refer to directions parallel to the axial direction of the lead screw component 131.

[0071] While ensuring that the guide groove 131a is continuous and closed-loop in the circumferential direction, those skilled in the art can adjust the configuration of the guide groove 131a according to actual needs. For example, the first guide groove 131b and the second guide groove 131c can each include bent sections, so that when the slider 132a moves in the first guide groove 131b, it can perform reciprocating linear motion in the first and second directions, and when the slider 132a moves in the second guide groove 131c, it can perform reciprocating linear motion in the first and second directions. Thus, when the lead screw component 131 is driven to rotate one revolution, the slider 132a drives the diaphragm to perform two complete strokes, including two suction strokes and two pumping strokes, via the connecting device 133. It is understood that those skilled in the art can select the number of bent sections according to actual needs to achieve the desired number of strokes when the lead screw component 131 is rotated one revolution.

[0072] Preferably, as shown in FIG3, the electric fluid pump 100 includes two pumping devices and two fluid chambers 150 corresponding to the two pumping devices. The two pumping devices are respectively disposed at both ends of the rotor 111 along the axial direction of the rotor 111, and the two fluid chambers 150 are respectively located on both sides of the housing 140. Each pumping device includes a diaphragm and a set of transmission assemblies 130. The two sets of transmission assemblies 130 are respectively connected to both ends of the rotor 111, and the two diaphragms are respectively connected to both ends of the two sets of transmission assemblies 130.

[0073] Preferably, as shown in FIG7, the guide grooves 131a on the lead screw components 131 of the two sets of transmission assemblies 130 are arranged and oriented in the same way, such that when the rotor 111 is driven to perform unidirectional rotational motion, the lead screw components 131 at both ends of the rotor 111 rotate in the same direction as the rotor 111, and the nut components 132 located at the ends of each lead screw component 131 are driven to perform linear motion in the same direction as each other. During operation, when the rotor 111 is driven to perform one unidirectional rotation, the two nut components 132 move linearly in the first direction and then linearly in the second direction. When the two nut components 132 move linearly in the first direction, one of the two diaphragms is driven to perform a suction stroke to draw fluid from the inlet manifold 140b into the fluid chamber 150, while the other of the two diaphragms is driven to perform a pumping stroke to drive fluid from the fluid chamber 150 to the outlet manifold 140a. When the two nut components 132 move linearly in the second direction, one of the two diaphragms is driven in a pumping stroke to drive fluid from the fluid chamber 150 to the outlet manifold 140a, while the other diaphragm is driven in a suction stroke to draw fluid from the inlet manifold 140b into the fluid chamber 150. This design allows the volumes of the fluid chambers 150 at both ends to change alternately, enabling the electric fluid pump 100 to continuously draw in and discharge liquid.

[0074] The present invention also provides a method for pumping fluid using the electric fluid pump 100 as described above, the method comprising:

[0075] Drive rotor 111 to rotate in one direction;

[0076] In response to the unidirectional rotation of the rotor 111, the transmission assembly 130 drives the diaphragm to perform linear reciprocating motion for the pumping and suction strokes.

[0077] In actual operation, the rotor 111 can be driven to rotate in one direction by starting the motor. When the rotor 111 rotates in one direction, the lead screw component 131 of the transmission assembly 130 is driven to rotate synchronously in one direction. At the same time, the nut component 132 drives the diaphragm to perform linear reciprocating motion along the axial direction of the lead screw component 131, thereby pumping and extracting fluid.

[0078] The specific structure and working process of the electric fluid pump 100 have been described in detail above, and will not be repeated here for the sake of brevity.

[0079] The method for fluid pumping using the electric fluid pump according to this application can achieve stable, reliable, efficient and high-precision fluid pumping without the need for additional components such as controllers or sensors, thereby improving the reliability of the electric fluid pump. Furthermore, this solution can also extend the lifespan of the electric fluid pump and save costs.

[0080] Implementation Method 2

[0081] The electro-fluid pump according to a second preferred embodiment of the present invention will be described in detail below with reference to Figures 9-12. Except for the structure of the transmission assembly, the electro-fluid pump according to the second embodiment has a generally similar structure to the electro-fluid pump according to the first embodiment; therefore, for the sake of brevity, only the differences will be described in detail below.

[0082] As shown in Figure 9, in this embodiment, the transmission assembly 230 includes a lead screw component 231 and a nut component 232 connected to the lead screw component 231. A guide groove 231a is formed on the outer periphery of the lead screw component 231. The nut component 232 includes a connecting device 233 and a sliding member 232a connected to the connecting device 233. The sliding member 232a is movably disposed in the guide groove 231a, and the connecting device 233 is fixedly connected to the diaphragm. The guide groove 231a is structurally arranged such that when the lead screw component 231 is driven to perform unidirectional rotational motion, the sliding member 232a can perform linear reciprocating motion along the axial direction of the lead screw component 231.

[0083] The structure of the guide groove 231a on the lead screw component 231 will be described in detail below.

[0084] As shown in Figures 10 and 11, the guide groove 231a extends in both the circumferential and axial directions of the lead screw component 231, and has a predetermined extension length in the axial direction. The guide groove 231a is continuous and arranged in a closed loop in the circumferential direction, that is, the groove shape of the guide groove 231a is complete, cyclic and continuous in the circumferential direction.

[0085] As shown in Figure 10, the guide groove 231a is composed of a first guide groove 231b and a second guide groove 231c. Both the first guide groove 231b and the second guide groove 231c are constructed as spiral grooves, and the spiral direction of the first guide groove 231b is opposite to that of the second guide groove 231c. The first guide groove 231b and the second guide groove 231c are connected end to end, that is, the first end and the second end of the first guide groove 231b are connected and communicate with the first end and the second end of the second guide groove 231c, respectively.

[0086] In a preferred embodiment, the distance between the first end and the second end of the first guide groove 231b in the axial direction of the lead screw component 231 is equal to the predetermined extension length of the guide groove 231a, and the distance between the first end and the second end of the second guide groove 231c in the axial direction is equal to the predetermined extension length of the guide groove 231a.

[0087] Referring further to Figures 10 and 11, a plurality of corner portions 234 are formed on the lead screw component 231. These corner portions 234 are arranged sequentially along the axial direction of the lead screw component 231, and adjacent corner portions 234 are respectively positioned on opposite sides of the lead screw component 231 relative to its central axis. In the illustrated embodiment, two corner portions 234 are formed on the lead screw component 231. It is understood that those skilled in the art can also provide other numbers of corner portions 234 as needed. The hypotenuse of the corner portion 234 forms the groove edge of the guide groove 231a.

[0088] In one embodiment, the corner portion 234 is generally constructed as a parallelogram structure in the unfolded configuration. It should be noted that the term "unfolded configuration" refers to the state after the cylindrical surface of the lead screw component 231 has been cut along one of its generatrices and flattened. A pair of parallel inclined sides of the same corner portion 234 form the helical edge of one of the guide grooves 231b and 231c, and another pair of parallel inclined sides of the same corner portion 234 form the helical edge of the other guide groove 231b and 231c. Furthermore, the inclined sides of two adjacent corner portions 234 with the same inclination direction form the helical edge of one of the guide grooves 231b and 231c.

[0089] In use, when the lead screw component 231 is driven to rotate in one direction, if the slider 232a moves in the first guide groove 231b, it performs linear motion in the first direction. When the slider 232a moves to the end of the first guide groove 231b, it automatically turns to move in the second guide groove 231c at the junction of the first guide groove 231b and the second guide groove 231c (point A as shown in Figure 11), at which time it can perform linear motion in the second direction opposite to the first direction. Thus, when the slider 232a moves in the first guide groove 231b and the second guide groove 231c, it can drive the diaphragm to reciprocate via the connecting device 233, thereby enabling the suction and pumping of liquid.

[0090] In one embodiment, the slider 232a includes a sliding pin 232b that contacts the guide groove 231a. Preferably, the sliding pin 232b has an arcuate contact surface 232c that mates with the guide groove 231a. This design allows the sliding pin 232b to better fit the shape of the guide groove 231a, thereby reducing friction and wear and improving the product's service life.

[0091] The above description of various embodiments of this application is provided for descriptive purposes to a person of ordinary skill in the art. It is not intended to exclude or limit this application to a single disclosed embodiment. As taught above, a person of ordinary skill in the art will understand that various alternatives and variations of this application are possible. Therefore, although some alternative embodiments have been specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. This application is intended to include all alternatives, modifications, and variations of this application described herein, as well as other embodiments falling within the spirit and scope of the application described above.

Claims

1. An electric fluid pump, characterized in that, The electro-fluid pump includes: A drive device, the drive device including a rotor configured to rotate about its axis of rotation; and Pumping device, the pumping device comprising: A fluid displacement member configured to be driven to reciprocate for pumping fluid; and A transmission assembly is connected to the rotor and the fluid displacement member respectively, and the transmission assembly is configured to convert the unidirectional rotational motion of the rotor into the linear reciprocating motion of the fluid displacement member.

2. The electric fluid pump according to claim 1, characterized in that, The transmission assembly includes: A lead screw assembly connected to the rotor and configured to be driven by the rotor to perform synchronized unidirectional rotational motion, the lead screw assembly having guide grooves formed on its outer periphery; and A nut component, connected to the fluid displacement member, includes a slider movably disposed in the guide groove. The guide groove is arranged such that when the lead screw component is driven to perform the unidirectional rotational motion, the sliding member can perform linear reciprocating motion along the axial direction of the lead screw component.

3. The electric fluid pump according to claim 2, characterized in that, The lead screw component is arranged coaxially with the rotor.

4. The electric fluid pump according to claim 2, characterized in that, The guide groove extends in the circumferential and axial directions of the lead screw component. The guide groove is continuous and closed-loop in the circumferential direction and has a predetermined extension length in the axial direction.

5. The electric fluid pump according to claim 4, characterized in that, The guide groove includes a first guide groove and a second guide groove. The first end and the second end of the first guide groove are respectively connected to the first end and the second end of the second guide groove. The distance between the first end and the second end of the first guide groove in the axial direction is equal to the predetermined extension length, and the distance between the first end and the second end of the second guide groove in the axial direction is equal to the predetermined extension length.

6. The electric fluid pump according to claim 5, characterized in that, The guide groove is configured such that when the lead screw component performs the unidirectional rotational motion, the slider moves linearly in a first direction when it moves in the first guide groove, and moves linearly in a second direction opposite to the first direction when it moves in the second guide groove.

7. The electric fluid pump according to claim 6, characterized in that, The first guide groove and the second guide groove are arranged symmetrically with respect to the axial center plane of the lead screw component.

8. The electric fluid pump according to claim 7, characterized in that, The first guide groove and the second guide groove each include a bent section, such that when the lead screw component performs the unidirectional rotational motion: when the slider moves in the first guide groove, it performs linear reciprocating motion in a first direction and a second direction opposite to the first direction, and when the slider moves in the second guide groove, it performs linear reciprocating motion in the first direction and the second direction.

9. The electro-fluid pump according to claim 7 or 8, characterized in that, The sliding element includes balls or rollers that are slidably disposed in the guide groove.

10. The electric fluid pump according to claim 6, characterized in that, Both the first guide groove and the second guide groove are constructed as spiral grooves, and the spiral direction of the first guide groove is opposite to that of the second guide groove.

11. The electric fluid pump according to claim 10, characterized in that, The lead screw has multiple corners, which are arranged sequentially along the axial direction of the lead screw, and two adjacent corners are arranged opposite each other relative to the central axis of the lead screw. The hypotenuse of the corner forms the groove edge of the guide groove.

12. The electric fluid pump according to claim 11, characterized in that, The corner portion is constructed as a parallelogram structure in the unfolded configuration, wherein a pair of parallel hypotenuses of the corner portion forms the spiral edge of one of the first guide grooves and the second guide groove, and another pair of parallel hypotenuses of the corner portion forms the spiral edge of the other of the first guide grooves and the second guide groove.

13. The electric fluid pump according to any one of claims 10-12, characterized in that, The slider includes a sliding pin having an arcuate contact surface for engaging with the guide groove.

14. The electric fluid pump according to claim 2, characterized in that, The nut component further includes a connecting device fixedly connected to the fluid displacement member. The connecting device includes a first connecting portion and a second connecting portion connected to the first connecting portion. The first connecting portion is sleeve-shaped and sleeved on the end of the lead screw component. The first connecting portion is configured to move on the lead screw component along the axial direction of the lead screw component. The outer wall of the first connecting portion has a first hole and the end is provided with a second hole. The fluid displacement member is provided with a third hole. A portion of the sliding member is embedded in the first hole. The second connecting portion is columnar and its two ends are respectively installed to the second hole and the third hole.

15. The electric fluid pump according to claim 1, characterized in that, The fluid displacement component includes a diaphragm, the central axis of which coincides with the rotation axis of the rotor.

16. The electric fluid pump according to claim 2, characterized in that, The rotor and the lead screw are formed as a single unit, or the rotor and the lead screw are the same component.

17. The electric fluid pump according to claim 1, characterized in that, The drive unit is a permanent magnet synchronous direct drive motor.

18. The electric fluid pump according to claim 2, characterized in that, The electric fluid pump includes two pumping devices, which are respectively disposed at both ends of the rotor along the axial direction of the rotor. Each pumping device includes a fluid displacement component and a set of transmission components. The two sets of transmission components are respectively connected to both ends of the rotor, and the two fluid displacement components are respectively connected to both ends of the two sets of transmission components.

19. The electric fluid pump according to claim 18, characterized in that, The rotor is configured to, when performing unidirectional rotational motion, be able to: The two nut components are driven to move linearly in a first direction to drive one of the two fluid displacement components to perform a suction stroke and simultaneously drive the other of the two fluid displacement components to perform a pumping stroke. The two nut components are driven to move linearly in a second direction opposite to the first direction, so as to drive one of the two fluid displacement components to perform a pumping stroke and synchronously drive the other of the two fluid displacement components to perform a suction stroke.

20. A method for pumping fluid using an electric fluid pump as described in any one of claims 1-19, characterized in that, The method includes: Drive the rotor to rotate in one direction; and In response to the unidirectional rotation of the rotor, the fluid displacement member performs linear reciprocating motion for pumping and suction strokes.

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