Fluid pump

Abstract

The utility model discloses a fluid pump, and relates to the technical field of fluid supply equipment, the fluid pump comprises a first seat body, and the first seat body is internally provided with a first cavity; the diaphragm cylinder is arranged in the first cavity, one end of the diaphragm cylinder communicates with the inlet end, and the other end communicates with the outlet end; the second seat body is adjacent to the first seat body, the second seat body is provided with a second cavity, and the second cavity is communicated with the first cavity; the expansion part is arranged in the second cavity, and one end of the expansion part is fixed in the second cavity; the moving end of the driving assembly enters the second cavity to be connected with the other end of the expansion part, the first cavity and the second cavity are filled with driving fluid, and the moving end drives the expansion part to stretch, expand and extrude the inner space of the second cavity. The expansion piece used for adjusting the volume change and the diaphragm barrel used for conveying the fluid material are arranged separately, the diaphragm barrel and the expansion piece cooperatively deform in the working process, movement inertia can be effectively counteracted, and the pumping precision can be greatly improved.

Description

Technical Field

[0001] This application relates to the field of fluid supply equipment technology, and in particular to a fluid pump. Background Technology

[0002] Coating technology is widely used in new energy (lithium batteries, photovoltaics), electronic displays (OLEDs, flexible circuits), precision chemicals, and other fields. Its core process requirements include: high-precision flow control: the uniformity of coating thickness directly affects product performance (such as the energy density of lithium batteries and the light transmittance of electronic films), and the flow error must be ≤±1%; low pulsation output: pressure fluctuations cause coating "stripes" or "pinholes", which have a significant impact, especially on nanoscale slurries (such as electrode materials); corrosion resistance and long life: the coating liquid contains corrosive solvents (such as NMP, DMF) or high solid content particles (such as ceramic slurries), requiring the pump body material and sealing structure to be wear-resistant and chemically resistant; rapid response and maintainability: the coating line speed is as high as 100m / min, requiring the pump body to have dynamic adjustment capabilities, and the downtime maintenance cost is high.

[0003] Traditional injection pumps (such as plunger pumps and single diaphragm pumps) have problems such as large pulsation (>10%), low precision (error ±3%~5%), and easy leakage and wear, which make it difficult to meet the needs of high-end coating and restrict product yield and process upgrades. Utility Model Content

[0004] This application aims to solve one of the aforementioned technical problems in the prior art. Therefore, embodiments of this application provide a fluid pump.

[0005] According to an embodiment of this application, a fluid pump is provided, including a first base, with an inlet end and an outlet end respectively provided at both ends of the first base, and a first cavity provided inside the first base;

[0006] A deformable diaphragm tube is disposed in the first cavity, one end of the diaphragm tube is connected to the inlet end, and the other end of the diaphragm tube is connected to the outlet end;

[0007] A second seat adjacent to the first seat, the second seat having a second cavity connected to the first cavity;

[0008] An expansion member is disposed within the second cavity, and one end of the expansion member is fixed within the second cavity;

[0009] A drive assembly is provided, wherein the moving end of the drive assembly enters the second cavity and connects to the other end of the expansion member. The first cavity and the second cavity are filled with drive fluid. The moving end drives the expansion member to stretch, expand and compress the internal space of the second cavity, so that the drive fluid in the second cavity flows toward the first cavity and squeezes the diaphragm tube, thereby enabling the fluid material in the diaphragm tube to be squeezed out from the outlet end.

[0010] The aforementioned fluid pump has at least the following beneficial effects: During use, the position of the fluid pump is adjusted so that the diaphragm tube is vertically positioned. During the fluid material discharge process, the inlet is closed and the outlet is open. The moving end of the drive assembly causes the expansion member to extend, thereby increasing the volume of the expansion member to compress the space of the second chamber. This forces the driving fluid in the second chamber to flow into the first chamber and squeeze the diaphragm tube, causing the diaphragm tube to deform and expel the fluid material from the outlet. During the fluid material intake process, the outlet is closed and the inlet is open. The moving end of the drive assembly causes the expansion member to contract, thereby reducing the volume of the expansion member and minimizing its occupation of excessive space in the second chamber. This forces the driving fluid in the first chamber to flow back into the second chamber. The change in the volume of the first chamber creates a negative pressure inside the contracted diaphragm tube, allowing the fluid material to be drawn into the diaphragm tube from the inlet. Compared with the prior art, this application separates the expansion component used to adjust the volume change from the diaphragm cylinder used to transport the fluid material. The diaphragm cylinder and the expansion component deform together during operation, which can effectively counteract the motion inertia and greatly improve the pumping accuracy. The expansion component does not come into direct contact with the fluid material, and the traditional connecting rod is eliminated by using the driving fluid as the transmission medium, which effectively solves the problem of wear particle generation and extends the service life of the expansion component and the diaphragm cylinder.

[0011] According to the fluid pump described in the embodiments of this application, the diaphragm tube includes two cylinders, which are arranged adjacently and have overlapping portions. The internal spaces of the two cylinders are connected so that the cross-sectional area of ​​the internal space of the diaphragm tube is shaped like an "8".

[0012] According to the fluid pump described in the embodiments of this application, the cross-sectional shape of the cylinder is elliptical, and the ratio of the distance between the central axes of the two cylinders to the length of the major axis of the cylinder is set to 2:3.

[0013] According to the fluid pump described in the embodiments of this application, the diaphragm cylinder is made of PFA.

[0014] According to the fluid pump described in the embodiments of this application, the end of the diaphragm tube has a tapered enlargement.

[0015] According to the fluid pump described in the embodiments of this application, the expansion member is provided with an expansion cavity, one end of the expansion member is open, and the open end of the expansion member is fixed to the second cavity to divide the second cavity into a first space and a second space. The first space is connected to the first cavity, a portion of the drive assembly is disposed in the second space, and the moving end enters the expansion cavity and is fixedly connected to the expansion member.

[0016] According to the fluid pump described in the embodiments of this application, the first base body is provided with a first opening, the second base body is provided with a second opening, the first opening is connected to the second opening, and a clamping member is provided on one side of the second opening. The clamping member seals the open end of the expansion member to one side of the second opening, thereby dividing the second cavity into the first space and the second space.

[0017] According to the fluid pump described in the embodiments of this application, the driving assembly includes a drive motor, a lead screw transmission structure, and a transmission component. The drive motor is fixed to the second housing body, and the transmission component is slidably disposed on the clamping member. One end of the transmission component is connected to the lead screw transmission structure, and the other end of the transmission component enters the expansion chamber and is fixedly connected to the expansion member. The transmission component is formed as the moving end.

[0018] According to the fluid pump described in the embodiments of this application, the drive assembly further includes two guide rods. The guide rods are inserted into the lead screw nut of the lead screw transmission structure. The two guide rods are respectively disposed on both sides of the lead screw of the lead screw transmission structure, and one end of the guide rod is fixed to the clamping member.

[0019] According to the fluid pump described in the embodiments of this application, the expansion element is a bellows.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

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

[0022] Figure 1 This is a schematic diagram of the structure of the fluid pump according to an embodiment of this application. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the fluid pump in an embodiment of this application. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the structure of the fluid pump in an embodiment of this application. Figure 3 ;

[0025] Figure 4 yes Figure 2 Enlarged view of point A in the middle;

[0026] Figure 5 This is a schematic diagram of the diaphragm tube structure in an embodiment of this application. Figure 1 ;

[0027] Figure 6 This is a schematic diagram of the diaphragm tube structure in an embodiment of this application. Figure 2 ;

[0028] Figure 7 This is a schematic diagram of the transmission structure in an embodiment of this application.

[0029] Reference numerals: Second seat 110, First space 111, Second space 112, First seat 120, First cavity 121, Diaphragm tube 130, Cylinder 131, Conical enlargement part 132, Expansion member 140, Pressing member 150, Second pressing block 161, First pressing block 162, Sealing ring 163, Transmission member 210, Lead screw member 220, Lead screw nut 230, Drive motor 240, Return sensor 251, Trigger rod 252, Guide rod 260, Coupling 270, Reducer 280, Mounting seat 290, Solenoid valve 300. Detailed Implementation

[0030] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0031] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0034] Traditional pumps (such as flat disc diaphragm pumps and gear pumps) have large flow fluctuations (pulsation > 3%) and low open-loop control accuracy (±3%~5%) due to structural limitations, which cannot meet the requirements of coating processes for nanoscale coating uniformity.

[0035] Traditional pumps are prone to clogging or corrosion in high solids content slurries (such as lithium battery electrode slurries) and corrosive media (such as NMP solvents), and have a narrow applicable viscosity range (usually <1000 cPs).

[0036] Furthermore, in traditional pumps (such as plunger pumps and gear pumps), dynamic friction pairs (relatively moving contact parts) are the core source of particulate pollution, and prolonged use can easily generate particles.

[0037] To solve the above problems, refer to Figures 1 to 3 This application provides a fluid pump, which includes a first base 120, a diaphragm cylinder 130, a second base 110, an expansion member 140, and a drive assembly.

[0038] The first seat 120 has an inlet end and an outlet end at its two ends, and a first cavity 121 is provided inside the first seat 120.

[0039] The diaphragm tube 130 is deformable and is disposed within the first cavity 121. One end of the diaphragm tube 130 is connected to the inlet end, and the other end is connected to the outlet end. The fluid material to be transported enters from the inlet end and is stored inside the diaphragm tube 130. Then, the fluid material inside the diaphragm tube 130 is squeezed out from the outlet end by the deformation of the diaphragm tube 130, thereby completing the quantitative transport of the fluid material.

[0040] The second seat 110 is adjacent to and fitted with the first seat 120. The second seat 110 has a second cavity inside, which is connected to the first cavity 121.

[0041] The expansion member 140 is disposed in the second cavity. Specifically, one end of the expansion member 140 is fixed inside the second cavity, and the moving end of the drive assembly enters the second cavity and connects to the other end of the expansion member 140. The first cavity 121 and the second cavity are filled with drive fluid. The moving end drives the expansion member 140 to stretch and expand, squeezing the internal space of the second cavity, so that the drive fluid in the second cavity flows toward the first cavity 121 and squeezes the diaphragm cylinder 130, thereby squeezing the fluid material in the diaphragm cylinder 130 from the outlet end.

[0042] Specifically, during use, the position of the fluid pump is adjusted so that the diaphragm cylinder 130 is set in a vertical direction to ensure smoother flow of fluid materials. When applied to battery electrode slurry, the vertically set diaphragm cylinder 130 can ensure good slurry flow and support slurry with a solid content ≤70%.

[0043] During the fluid material discharge process, the inlet is closed and the outlet is opened. The moving end of the drive component drives the expansion member 140 to extend, thereby increasing the volume of the expansion member 140 to compress the space of the second cavity. This forces the drive fluid in the second cavity to flow to the first cavity 121 and squeeze the diaphragm tube 130. The diaphragm tube 130 deforms to squeeze the fluid material in the diaphragm tube 130 out from the outlet.

[0044] During the fluid material intake process, the outflow end is closed and the inflow end is opened. The moving end of the drive component causes the expansion member 140 to contract, thereby reducing the volume of the expansion member 140 and reducing the space occupied by it in the second cavity. This forces the drive fluid in the first cavity 121 to flow back to the second cavity. Due to the change in the volume of the first cavity 121, a negative pressure is generated in the diaphragm cylinder 130 in the contracted state, which allows the fluid material to be drawn into the diaphragm cylinder 130 from the inflow end.

[0045] Compared with the prior art, this application separates the expansion member 140 used to adjust the volume change from the diaphragm cylinder 130 used to transport fluid materials. The diaphragm cylinder 130 and the expansion member 140 deform together during operation, which can effectively counteract the motion inertia and greatly improve the pumping accuracy. The expansion member 140 does not come into direct contact with the fluid material, and the traditional connecting rod is eliminated by using the driving fluid as the transmission medium, which effectively solves the problem of wear particle generation and extends the service life of the expansion member 140 and the diaphragm cylinder 130.

[0046] In some specific embodiments, such as Figure 5 and Figure 6 As shown, the diaphragm tube 130 includes two tubes 131, which are arranged adjacently and have overlapping portions. The internal spaces of the two tubes 131 are connected so that the cross-sectional area of ​​the internal space of the diaphragm tube 130 is shaped like an "8".

[0047] Specifically, the two cylindrical bodies 131 are arranged in parallel and their internal spaces partially overlap, with the overlapping portion not exceeding one-half. The "8"-shaped cross-section formed by the combination of the two cylindrical bodies 131 makes the deformation of the diaphragm cylinder 130 easier compared to a single cylindrical body 131. The cylindrical body 131 is a circular cylindrical body 131.

[0048] In some specific embodiments, the cross-sectional shape of the cylinder 131 is set to elliptical, the ratio of the distance between the central axes of the two cylinders 131 to the length of the major axis of the cylinder 131 is set to 2:3, the cylinder 131 is set to elliptical, and one side of the major axis of the two cylinders 131 intersects to form a diaphragm cylinder 130. Setting the cross-sectional shape of the cylinder 131 to elliptical makes the deformation of the diaphragm cylinder 130 easier.

[0049] The major axis of the cylinder 131 is set to 8~40mm, specifically, the major axis of the cylinder 131 is set to 30mm, which allows for better flow of slurry or fluid materials compared to the diameter of the transmission channel of the pump.

[0050] In some examples, the diaphragm tube 130 is made of PFA. PFA is a smooth material that allows for smoother pumping of slurry and virtually eliminates particle generation due to its small contact area.

[0051] In some examples, the end of the diaphragm tube 130 has a tapered enlargement. The tapered enlargement 132 allows for smoother feeding and discharging, and also serves to guide and direct the flow during the feeding process, effectively reducing fluid resistance.

[0052] In some embodiments of this application, the first cavity 121 extends from one end of the first seat 120 to the other end, and a locking structure is provided at the end of the first seat 120 for sealing and fixing the diaphragm cylinder 130.

[0053] Specifically, such as Figure 4 As shown, the locking structure includes a first pressing block 162 and a second pressing block 161. The first pressing block 162 is sealed to the first base 120. The middle part of the first pressing block 162 is provided with a through hole for the conical amplification part 132 to pass through. A first step is provided in the through hole. The second pressing block 161 has a pressing end with a second step. After the pressing end enters the conical amplification part 132, the first step and the second step are coupled to press the conical amplification part 132.

[0054] The first pressure block 162 is connected to the first base 120 by screws, and the second pressure block 161 is connected to the second pressure block 162 by screws. The surface of the first pressure block 162 that contacts the first base 120 is provided with a groove for placing the sealing ring 163. The surface of the first pressure block 162 or the second pressure block 161 that contacts the conical enlarged part 132 is provided with a groove for placing the sealing ring 163. During installation, by placing the sealing ring 163 in the groove, the driving fluid can be effectively prevented from seeping into the diaphragm cylinder 130, or the leakage of the driving fluid can be avoided from affecting the pumping accuracy.

[0055] The second pressure block 161 has a channel in the middle for the fluid material to enter. The channel is formed as an inlet end or an outlet end. The channel is equipped with a solenoid valve 300 for controlling the on / off state, so that the on / off state of the inlet end or outlet end can be controlled as needed.

[0056] In some embodiments, the expansion member 140 is provided with an expansion cavity, one end of the expansion member 140 is open, and the open end of the expansion member 140 is fixed to the second cavity to divide the second cavity into a first space 111 and a second space 112. The first space 111 is connected to the first cavity 121, and part of the driving component is disposed in the second space 112, and the moving end enters the expansion cavity and is fixedly connected to the expansion member 140.

[0057] That is, the second space 112 is not connected to the first space 111 or the first cavity 121 under the action of the expansion member 140. The second space 112 serves as the movement space of the drive component to avoid the drive fluid from seeping into the drive component and affecting its lifespan or transmission effect. By stretching or compressing the expansion member 140, the volume of the first space 111 can be changed. The change in volume can then cause the drive fluid to flow and squeeze the diaphragm cylinder 130 or flow back to the first space 111.

[0058] In some specific embodiments, the first seat 120 is provided with a first opening, the second seat 110 is provided with a second opening, the first opening is connected to the second opening, and a sealing ring 163 is provided at the connection between the first opening and the second opening to prevent leakage of the driving fluid.

[0059] like Figure 2 and Figure 3 As shown, a clamping member 150 is provided on one side of the second opening. The clamping member 150 seals the open end of the expansion member 140 to one side of the second opening, thereby dividing the second cavity into a first space 111 and a second space 112. The shape of the clamping member 150 is similar to that of the second cavity, and a step for positioning the clamping member 150 is provided inside the second cavity. After the clamping member 150 presses against the step, it can separate the second cavity. One end of the expansion member 140 is fixed to the side of the clamping member 150 facing the first space 111.

[0060] Furthermore, a sealing ring 163 is provided at the contact position between the clamping member 150 and the step to improve the sealing effect.

[0061] In some embodiments, such as Figure 7 As shown, the drive assembly includes a drive motor 240, a lead screw transmission structure, and a transmission component 210. The drive motor 240 is fixed outside the second base 110, and the transmission component 210 is slidably disposed on the clamping component 150. One end of the transmission component 210 is connected to the lead screw transmission structure, and the other end of the transmission component 210 enters the expansion cavity and is fixedly connected to the expansion component 140. One end of the transmission component 210 is formed as the moving end.

[0062] Specifically, the drive assembly also includes a reducer 280, which is disposed at one end of the second base 110. The drive motor 240 is connected to the reducer 280. The second space 112 is provided with a mounting base 290 for fixing the screw drive structure. The output end of the reducer 280 is connected to the screw member 220 of the screw drive structure through a coupling 270. The screw member 220 is rotatably disposed on the mounting base 290. The screw drive structure also includes a screw nut 230, which is connected to the screw member 220. The screw drive structure converts the rotation of the drive motor 240 into the linear motion of the transmission member 210, thereby driving the expansion member 140 to stretch or compress.

[0063] In some specific embodiments, the drive assembly further includes two guide rods 260, which are inserted into the lead screw nut 230 of the lead screw drive structure. The two guide rods 260 are respectively disposed on both sides of the lead screw component 220 of the lead screw drive structure, and one end of the guide rod 260 is fixed to the clamping member 150. The guide rods 260 guide the lead screw nut 230 and prevent the lead screw nut 230 from rotating, so that while the lead screw component 220 rotates, the lead screw nut 230 performs linear motion.

[0064] One end of the transmission component 210 is cylindrical, and the other end is provided with two connecting parts. Part of the transmission component 210 is located in the expansion cavity. The connecting parts pass through the clamping component 150 and connect to the lead screw nut 230. That is, the clamping component 150 is provided with a guide hole for the transmission component 210 to pass through, which can guide the transmission component 210 to a certain extent.

[0065] In some embodiments, the drive assembly further includes a return sensor 251 and a trigger rod 252. The return sensor 251 is fixedly installed, and the trigger rod 252 is installed on the transmission component 210. The cooperation between the trigger rod 252 and the return sensor 251 ensures that the transmission component 210 can automatically reset back to its original position.

[0066] In some specific embodiments, the expansion element 140 is a bellows. Bellows made of PTFE are resistant to creep, have a long service life, and reduce the frequency of maintenance.

[0067] Overall, this application systematically solves the technical bottlenecks in precision, lifespan, and adaptability of injection pumps in the coating industry through composite structure innovation and material system optimization, providing a reliable core fluid control component for high value-added coating processes (such as lithium battery electrodes and optical films).

[0068] This application fundamentally eliminates the generation of wear particles from friction pairs through non-contact drive and a fully sealed deformation structure. It is especially suitable for high-end coating fields with stringent cleanliness requirements (such as semiconductors and pharmaceuticals). It can replace traditional pumps that require complex filtration systems and provides a solution for "maintenance-free and zero-pollution" fluid transportation.

[0069] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A fluid pump, characterized in that: include The first seat has an inlet end and an outlet end respectively at both ends, and a first cavity is provided inside the first seat. A deformable diaphragm tube is disposed in the first cavity, one end of the diaphragm tube is connected to the inlet end, and the other end of the diaphragm tube is connected to the outlet end; A second seat adjacent to the first seat, the second seat having a second cavity connected to the first cavity; An expansion member is disposed within the second cavity, and one end of the expansion member is fixed within the second cavity; A drive assembly is provided, wherein the moving end of the drive assembly enters the second cavity and connects to the other end of the expansion member. The first cavity and the second cavity are filled with drive fluid. The moving end drives the expansion member to stretch, expand and compress the internal space of the second cavity, so that the drive fluid in the second cavity flows toward the first cavity and squeezes the diaphragm tube, thereby enabling the fluid material in the diaphragm tube to be squeezed out from the outlet end.

2. The fluid pump according to claim 1, characterized in that: The diaphragm tube includes two tubes, which are arranged adjacently and have overlapping portions. The internal spaces of the two tubes are connected so that the cross-sectional area of ​​the internal space of the diaphragm tube is shaped like an "8".

3. The fluid pump according to claim 2, characterized in that: The cross-sectional shape of the cylinder is elliptical, and the ratio of the distance between the central axes of the two cylinders to the length of the major axis of the cylinder is set to 2:

3.

4. The fluid pump according to claim 1, characterized in that: The diaphragm tube is made of PFA.

5. The fluid pump according to claim 1, characterized in that: The end of the diaphragm tube has a tapered enlargement.

6. The fluid pump according to claim 1, characterized in that: The expansion member is provided with an expansion cavity, one end of the expansion member is open, and the open end of the expansion member is fixed to the second cavity to divide the second cavity into a first space and a second space. The first space is connected to the first cavity. A portion of the driving component is disposed in the second space, and the moving end enters the expansion cavity and is fixedly connected to the expansion member.

7. The fluid pump according to claim 6, characterized in that: The first seat body is provided with a first opening, and the second seat body is provided with a second opening. The first opening is connected to the second opening. A clamping member is provided on one side of the second opening. The clamping member seals the open end of the expansion member to one side of the second opening, thereby dividing the second cavity into the first space and the second space.

8. The fluid pump according to claim 7, characterized in that: The drive assembly includes a drive motor, a lead screw transmission structure, and a transmission component. The drive motor is fixed to the second housing body, and the transmission component is slidably disposed on the clamping component. One end of the transmission component is connected to the lead screw transmission structure, and the other end of the transmission component enters the expansion cavity and is fixedly connected to the expansion component. The transmission component is formed as the moving end.

9. The fluid pump according to claim 8, characterized in that: The drive assembly also includes two guide rods, which are inserted into the lead screw nut of the lead screw drive structure. The two guide rods are respectively disposed on both sides of the lead screw of the lead screw drive structure, and one end of the guide rod is fixed to the clamping member.

10. The fluid pump according to claim 1, characterized in that: The expansion component is a bellows.

Images