In-phase peristaltic pump

Abstract

The embodiment of the utility model discloses an in-phase peristaltic pump which is characterized in that a stop valve is arranged on the basis of an existing peristaltic pump, the stop valve is arranged outside a pump head, the stop valve is matched with the position of a roller in the pump head, and the stop valve is started at proper time, so that liquid is blocked in the pump head adjusting process; and the initial phases of the pump head are completely the same when the liquid is quantitatively output every time. In the liquid filling process, the release action that the hose is pressed by the rolling wheel is avoided, the influence of pulsation on quantitative transmission precision is eliminated, and the filling precision is improved. According to the scheme, the original advantages of cleanliness, easy maintenance, good controllability and the like of the peristaltic pump are reserved, meanwhile, accurate quantitative transmission of the peristaltic pump is achieved, the filling efficiency of the peristaltic pump is improved while the filling precision is improved, and the advantages of being low in cost and wide in adaptability are achieved.

Description

Technical Field

[0001] This application relates to the field of peristaltic pump technology, and more particularly to a peristaltic pump with the same phase. Background Technology

[0002] A peristaltic pump is a common type of fluid pump. Its principle is to use rollers to continuously compress a flexible tube, thereby driving the fluid flow within the tube. Because there is no impeller agitation, peristaltic pumps have low shear forces; and because the liquid only comes into contact with the tube, it has minimal impact on the liquid's cleanliness. In particular, the flexible tubes used in peristaltic pumps are highly elastic and have strong resilience, enabling them to transfer liquids with high precision. These characteristics determine the widespread application of peristaltic pumps in medical, pharmaceutical, chemical, and biological fields.

[0003] In-phase linear pumps are a type of peristaltic pump that can be used for high-precision filling, with filling volumes down to the microliter level and filling accuracy up to ±1%. Currently, there are two types of peristaltic pumps on the market that achieve in-phase high-precision filling.

[0004] Firstly, it uses three motors to drive three actions: the peristaltic pump's rotation, the liquid blockage at the outlet, and the pump head's up-and-down movement to assist the rollers in returning to the initial phase. This type of pump has a complex structure and cumbersome operation.

[0005] Secondly, a peristaltic pump head is equipped with a pipeline switching valve assembly, which adds a return pipeline to the pipeline. The pump head motor and the valve assembly work together to achieve in-phase liquid output. This type of flexible tubing is complex. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the embodiments in this specification are implemented as follows:

[0007] This specification provides an embodiment of a co-phase peristaltic pump, comprising: a pump head, a hose, and a shut-off valve. The shut-off valve is disposed at the liquid outlet end of the hose and located outside the pump head. The arc of the pump head's upward pressure is less than 360 degrees per number of rollers. When the peristaltic pump is working, the pressure value inside the hose is less than the set sealing value of the shut-off valve.

[0008] Optionally, the number of rollers is at least 1.

[0009] Optionally, a check valve is provided at the inlet end of the hose, and the check valve is located outside the pump head.

[0010] Optionally, the peristaltic pump can be multi-channel.

[0011] Optionally, the pressure applied can be an elastic structure.

[0012] Optionally, the rollers of the peristaltic pump may be equipped with auxiliary rollers.

[0013] Optionally, the pump head may include a roller assembly and an upper pressure assembly. The upper pressure assembly includes an upper pressure unit, an upper pressure bracket, and a roller group positioning device. The upper pressure unit is mounted on the upper pressure bracket, which is hinged to the mounting base plate of the peristaltic pump. The roller group positioning device is hinged to the upper pressure bracket, and the upper pressure assembly is connected to the roller assembly through the roller group positioning device.

[0014] Optionally, the shut-off valve may include a fixed valve frame, a movable valve block, and a valve seat. The fixed valve frame is disposed on the valve seat, the movable valve block is connected to a valve actuator motor, and the fixed valve frame is provided with a groove for accommodating the hose.

[0015] Optionally, a sealing device may be provided on the valve seat.

[0016] Optionally, the peristaltic pump may further include a hose support for supporting the hose, the hose support including a front pump head support and a rear pump head support mounted on the mounting base plate.

[0017] The quantitative filling method of this in-phase peristaltic pump is as follows:

[0018] Determine the initial phase of the roller of the peristaltic pump, wherein the initial phase satisfies the condition that the roller presses the hose tightly closed, the roller is at the upper pressure front end, and the shut-off valve is open;

[0019] The roller is controlled to rotate, conveying the fluid in the hose to the outlet end, and the roller always keeps the hose in a tight and sealed state.

[0020] When the roller rotates to the designated position, the shut-off valve is closed. The designated position is determined based on the filling liquid volume.

[0021] Control the roller to rotate to the initial phase.

[0022] Optionally, before determining the initial phase of the peristaltic pump's rollers, the process may further include:

[0023] Control the pre-running of the peristaltic pump's rollers to increase the fluid pressure in the hose.

[0024] The above-described at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0025] 1. The in-phase peristaltic pump provided in this solution includes a pump head and a shut-off valve. Through the cooperation of the pump head and the shut-off valve, repeatable and high-precision liquid transfer can be achieved. This peristaltic pump simplifies the structure and pipeline based on the existing in-phase pump, and increases reliability and economy.

[0026] 2. When using this same-phase peristaltic pump for quantitative filling, the shut-off valve is activated in a timely manner to isolate the liquid during pump head adjustment and to ensure that the initial phase of the pump head is exactly the same for each quantitative liquid output. During the liquid filling process, the release action of the roller pressing the hose is avoided, eliminating the impact of pulsation on the quantitative transmission accuracy and improving filling accuracy. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of a peristaltic pump in the prior art;

[0029] Figure 2 This is a schematic diagram of a first embodiment of a peristaltic pump with the same phase.

[0030] Figure 3 This is a schematic diagram illustrating the principle of Example 1;

[0031] Figure 4 This is a schematic diagram of the filling process in Example 1. Figure 1 ;

[0032] Figure 5 This is a schematic diagram of the filling process in Example 1. Figure 2 ;

[0033] Figure 6 This is a schematic diagram of the filling process in Example 1. Figure 3 ;

[0034] Figure 7 This is a schematic diagram of the filling process in Example 1. Figure 4 ;

[0035] Figure 8 This is a schematic diagram of a second embodiment of a peristaltic pump with the same phase.

[0036] Figure 9 This is a three-dimensional schematic diagram of the overall structure of a fifth embodiment of a peristaltic pump with the same phase.

[0037] Figure 10 This is a side view of the overall structure of Example 5;

[0038] Figure 11 This is a three-dimensional schematic diagram of the opening of the upper pressure component in Embodiment 5;

[0039] Figure 12 This is a side view of the upper pressure assembly in Embodiment 5;

[0040] Figure 13This is a schematic diagram of the planar structure of the roller assembly in Embodiment 5;

[0041] Figure 14 This is a cross-sectional view of the roller assembly in Embodiment 5;

[0042] Figure 15 This is a schematic diagram of the upper pressure assembly in Example 5;

[0043] Figure 16 This is a schematic diagram of the upper pressure structure in Example 5;

[0044] Figure 17 This is a schematic diagram of the hose support and hose assembly in Example 5;

[0045] Figure 18 for Figure 17 A sectional view;

[0046] Figure 19 This is a schematic diagram of the flexible hose support in Example 5;

[0047] Figure 20 This is a three-dimensional structural diagram of Example 6;

[0048] Figure 21 This is a side view of Example 6;

[0049] Reference numerals: 100, Mounting base plate; 200, Pump head; 300, Shut-off valve; 400, Hoses support; 500, Hoses; 210, Roller assembly; 220, Pressurizing assembly; 211, Roller drive motor; 212, Motor bracket; 213, Roller assembly bracket; 214, Roller assembly; 215, Sealing device; 216, Pressurizing positioning cap; 217, Coupling; 218, Working wheel; 221, Upper... 222. Upper pressure bracket; 223. Roller group positioning device; 224. Roller group hook; 225. Upper pressure component fixing seat; 226. Upper pressure component rotating shaft; 310. Fixed valve frame; 311. Groove; 320. Movable valve block; 330. Valve seat; 340. Valve motor; 350. Connecting rod; 360. Cam device; 331. Sealing device; 410. Pump head front bracket; 420. Pump head rear bracket. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0052] Example 1

[0053] like Figure 2 As shown in the figure, this specification provides a phase-coordinated peristaltic pump, including: a pump head, a hose, and a shut-off valve. The shut-off valve is disposed at the liquid outlet end of the hose and located outside the pump head. The arc of the pump head is less than 360 degrees / number of rollers. When the peristaltic pump is working, the pressure value inside the hose is less than the set sealing value of the shut-off valve.

[0054] Compared with existing technologies (such as) Figure 1 The difference is as shown:

[0055] First, the shut-off valve in this design is located outside the pump head; this design reduces the size of the pump head.

[0056] Second, the arc of the pump head's upward pressure is less than 360 degrees per roller. This ensures that, at any position of the pump head, any roller in the roller assembly will disengage from the hose installed on the pump head's upward pressure (e.g., Figure 3 As shown in the diagram, this ensures free flow of fluid at both ends of the peristaltic pump head. It should be noted that the number of rollers on the peristaltic pump head roller core that compress the hose can be reduced to a minimum of one, thus decreasing the number of rollers compared to existing technologies. For example... Figure 3 As shown, when there are 3 rollers, the arc of the upward pressure is less than 120 degrees, i.e., θ < 120 degrees, and the working angle of the upward pressure is θ + α. When there is 1 roller, the arc of the upward pressure is less than 360 degrees.

[0057] Third, the pressure inside the hose should be set to be less than the set sealing value of the shut-off valve. That is, the sealing value of the selected shut-off valve should not be too small, so as to ensure that the peristaltic pump is not forced open by the fluid pressure inside the hose after the shut-off valve is closed when it is working normally.

[0058] The filling process using this in-phase peristaltic pump is as follows:

[0059] First, determine that the roller assembly of the peristaltic pump head is in the initial phase (e.g., Figure 4 (As shown). The initial phase is characterized by the roller pressing and sealing the hose on the pump head, with the roller positioned at the front of the pump head's upward pressure, and the shut-off valve at the outlet opening, allowing fluid to pass through.

[0060] Secondly, the roller assembly driving the pump head rotates, conveying the fluid in the hose forward (e.g., Figure 5 (As shown). During this process, the rollers must maintain a tight seal on the hose.

[0061] Third, when the roller reaches the designated position, the peristaltic pump hose discharges the designated volume of fluid, the outlet valve closes, and fluid flow is blocked on both sides (e.g., Figure 6 (As shown).

[0062] Fourth, control the roller assembly to operate and return to the initial phase, completing one filling process. The roller assembly, driven by the driver, rotates forward or backward to return to the initial phase. During this process, it must pass through a phase point (such as...). Figure 7 As shown in the diagram, at this phase point, any roller disengages from the hose pressed onto the pump head, the pipelines at both ends of the pump head are connected, and the pressure at both ends is balanced. During this process, the positive or negative pressure in the pipeline must not exceed the set sealing value of the outlet pipeline valve.

[0063] This completes one filling process. In some application scenarios, a single liquid filling can consist of one or more filling processes.

[0064] By using the above method for liquid filling, the initial phase of the peristaltic pump can be kept consistent each time it is filled, and the pulsation problem of the peristaltic pump can be avoided, while ensuring filling efficiency.

[0065] In addition, the rollers can be pre-run, meaning they can roll forward a certain distance after the machine is turned on to increase the pre-filled liquid pressure.

[0066] Example 2

[0067] Based on Example 1, a check valve (such as...) can also be installed at the inlet end of the hose. Figure 8 As shown in the figure, this prevents fluid pressure fluctuations generated during pump head piping from being transmitted to the inlet end.

[0068] Example 3

[0069] Based on Example 1, the peristaltic pump head can be pressurized with an elastic structure to optimize the overflow effect of the pump head and extend the service life of the peristaltic pump hose.

[0070] Example 4

[0071] Based on Embodiment 1, the peristaltic pump head roller can be supplemented with several auxiliary rollers, which can make the fluid flow rate more stable.

[0072] Example 5

[0073] like Figure 9-10 As shown, the peristaltic pump provided in this embodiment includes: a mounting base plate 100, on which a pump head 200, a shut-off valve 300, a hose bracket 400, and a hose 500 are provided.

[0074] like Figure 11-12 As shown, the pump head 200 includes a roller assembly 210 and an upper pressure assembly 220.

[0075] Among them, such as Figure 13-14 As shown, the roller assembly 210 includes a roller drive motor 211, a motor bracket 212, a roller assembly bracket 213, and a roller assembly 214. The roller assembly bracket 213 is fixed to the mounting base plate 100, and the roller assembly 214 can rotate freely on the roller assembly bracket 213. The roller drive motor 211 is fixed to the motor bracket 212, and the roller drive motor 211 is connected to and drives the roller assembly 214 through a coupling 217.

[0076] Furthermore, a sealing device 215 is provided inside the roller assembly bracket 213 to prevent accidentally leaked liquid from flowing into the internal space. An upper pressure positioning cap 216 is provided at the upper end of the roller assembly 214, and this component can rotate freely on the roller assembly 214.

[0077] like Figure 15 As shown, the upper pressure assembly 220 includes an upper pressure unit 221, an upper pressure bracket 222, a roller assembly positioning device 223, a roller assembly hook 224, an upper pressure assembly fixing seat 225, and an upper pressure assembly rotating shaft 226. The upper pressure unit 221 is mounted on the upper pressure bracket 222, which is hinged to the upper pressure assembly fixing seat 225. The upper pressure assembly fixing seat 225 is fixed to the mounting base plate 100. The roller assembly positioning device 223 is hinged to the upper pressure bracket 222. The upper pressure assembly 220 is connected to the roller assembly 210 via the roller assembly positioning device 223. The roller assembly hook 224 is mounted on the roller assembly positioning device 223, ensuring structural stability and preventing detachment after the upper pressure assembly 220 is connected to the roller assembly 210.

[0078] The structure of this pressure assembly allows for easy installation and removal of the hose from the peristaltic pump, while also ensuring the reliability of the peristaltic pump during normal operation.

[0079] It should be noted that the pressure boosting 221 in this scheme differs structurally from that of a traditional peristaltic pump. It must ensure that, at a certain phase of the roller assembly 214, the inlet and outlet of the hose 500 are connected; this is termed the "conducting phase." Figure 16 As shown, the roller assembly 214 has two working wheels 218, which are pressed by a working angle of 155°. It can be seen that within the working angle shown in the figure, there are no working wheels 218, so this phase is the conducting phase.

[0080] like Figure 17-18As shown, the shut-off valve 300 includes a fixed valve frame 310, a movable valve block 320, a valve seat 330, a valve-driven motor 340, a connecting rod 350, and a cam device 360. The fixed valve frame 310 is mounted on the valve seat 330. The valve seat 330 is fixed to the mounting base plate 100. The valve-driven motor 340 contacts the cam device 360, converting the rotational motion into reciprocating motion through motor rotation. The cam device 360 ​​is connected to the connecting rod 350, which is connected to the movable valve block 320, thereby transmitting the reciprocating motion to the movable valve block 320. The fixed valve frame 310 has a groove 311, in which the hose 500 is accommodated. Through the cooperation of the movable valve block 320 and the fixed valve frame 310, the size of the groove 311 is changed by the reciprocating motion, so as to achieve the alternating operation of the hose 500 in the open and closed states.

[0081] Furthermore, a sealing device 331 is provided on the valve seat 330 to prevent accidentally leaked liquid from flowing into the internal space.

[0082] like Figure 19 As shown, the hose support 400 includes a front pump head support 410 and a rear pump head support 420, which are fixedly connected to the mounting base plate 100 to support the hose 500 from falling off.

[0083] Example 6

[0084] Based on Example 5, the peristaltic pump head can be made into a multi-channel design to increase filling efficiency. For example... Figure 20 and 21 As shown, its structure is similar to that of Embodiment 5, except that it is designed as a multi-channel system, that is, multiple flexible tubes are arranged in parallel.

[0085] This specification presents a peristaltic pump with a phase-matching method, which, based on existing peristaltic pumps, incorporates a pipeline shut-off valve that coordinates with the position of the roller in the pump head. The valve is activated at appropriate times to isolate the liquid during pump head adjustment and ensures that the initial phase of the pump head is identical for each quantitative liquid output. During liquid filling, the release action of the roller pressing the tubing is avoided, eliminating the impact of pulsation on quantitative transmission accuracy and improving filling precision. This solution retains the original advantages of peristaltic pumps, such as cleanliness, ease of maintenance, and good controllability, while achieving precise quantitative transmission. It improves both filling accuracy and efficiency, and is characterized by low cost and wide adaptability (suitable for various tubing sizes).

[0086] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A positive displacement peristaltic pump characterized by, include: A pump head, a hose, and a shut-off valve, wherein the shut-off valve is disposed at the outlet end of the hose and is located outside the pump head; The arc of the pump head is less than 360 degrees per roller. When the peristaltic pump is working, the pressure value in the hose is less than the set sealing value of the shut-off valve.

2. The peristaltic pump of claim 1, wherein, The number of rollers is at least 1.

3. The peristaltic pump as described in claim 1, characterized in that, A check valve is provided at the inlet end of the hose, and the check valve is located outside the pump head.

4. The peristaltic pump as described in claim 1, characterized in that, The peristaltic pump is multi-channel.

5. The peristaltic pump as described in claim 1, characterized in that, The upper pressure adopts an elastic structure.

6. The peristaltic pump as claimed in claim 1, characterized in that, The peristaltic pump has auxiliary wheels on its rollers.

7. The peristaltic pump as claimed in claim 1, characterized in that, The pump head includes a roller assembly and an upper pressure assembly. The upper pressure assembly includes an upper pressure unit, an upper pressure bracket, and a roller group positioning device. The upper pressure unit is mounted on the upper pressure bracket, which is hinged to the mounting base plate of the peristaltic pump. The roller group positioning device is hinged to the upper pressure bracket, and the upper pressure assembly is connected to the roller assembly through the roller group positioning device.

8. The peristaltic pump as claimed in claim 1, characterized in that, The shut-off valve includes a fixed valve frame, a movable valve block, and a valve seat. The fixed valve frame is mounted on the valve seat, the movable valve block is connected to a valve actuator, and the fixed valve frame has a groove for accommodating the hose.

9. The peristaltic pump as claimed in claim 8, characterized in that, The valve seat is equipped with a sealing device.

10. The peristaltic pump as claimed in claim 7, characterized in that, The peristaltic pump also includes a hose support for supporting the hose, the hose support including a front pump head support and a rear pump head support mounted on the mounting base plate.

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