Liquid delivery device

Abstract

Provided in the present application is a liquid delivery device, comprising a pumping unit, an operating unit, a liquid balancing unit and a liquid intake container, wherein the pumping unit is provided with a pumping channel and a suction channel of equal flow rate; in an operating state, working liquid in the pumping channel is delivered into the liquid balancing unit and the operating unit; the suction channel draws the working liquid into an operating region as waste liquid, and waste liquid in the liquid balancing unit enters the suction channel through a waste liquid outlet; and the liquid balancing unit enables the flow rate at a working liquid inlet to always be equal to the flow rate at the waste liquid outlet, thereby ensuring that the flow rate of the working liquid entering the operating region is always equal to the flow rate of the waste liquid discharged from the operating region. Accordingly, the balanced inflow and outflow of liquid can be conveniently and efficiently achieved.

Description

A liquid delivery device

[0001] This application is based on and enjoys priority to Chinese Patent Application No. 202411748227.4 (filed on December 2, 2024). This application incorporates the entire contents of that application by reference. Technical Field

[0002] This application relates to a liquid conveying device capable of achieving liquid inflow and outflow balance. Background Technology

[0003] In practical applications such as the medical industry, especially in the surgical field, there is a need for high-pressure liquid irrigation or tissue ablation (such as water jets), which are usually equipped with liquid input channels and waste liquid discharge channels connecting the work area.

[0004] When a stable liquid level is required within the work area, existing technologies typically employ high-precision pumps in two channels, controlling both pumps to operate at equal flow rates. For applications requiring higher precision, flow meters (weighing, ultrasonic, or throttling types) are installed in both the liquid inlet and waste outlet channels. Based on the feedback from these flow meters, the flow rates of the two pumps are then adjusted manually or automatically by a program to ensure a balance between the inflow and outflow of liquid within the work area, achieving closed-loop management.

[0005] However, high-precision pumps are not only expensive, but also cannot guarantee delivery accuracy under high pressure. Even with servo motors controlling the pump, the flow rate error can exceed 5% or even 10%. Current flow meters generally have measurement errors above 5%. Non-contact flow meters used in the medical field are even more expensive and less accurate, with errors ranging from 5% to 10%. If two flow meters are used together, the total error will typically exceed 10%. Without intervention, the cumulative error will exceed acceptable limits. Therefore, current technologies require additional cumulative error detection devices or even manual intervention, which not only increases costs and system complexity, reducing robustness, but also turns automated equipment into semi-automated equipment, increasing the workload of medical staff and the risk of operational errors.

[0006] Therefore, in the existing technology, there is a technical challenge of how to conveniently and efficiently achieve liquid inflow and outflow balance. Summary of the Invention

[0007] The purpose of this application is to provide a liquid conveying device that can conveniently and efficiently achieve liquid inflow and outflow balance. To achieve the above objective, one solution of this application is a liquid conveying device comprising a pumping unit, a working unit, a liquid balancing unit, and an inlet container for storing the working liquid; the liquid balancing unit has a working liquid inlet and a waste liquid outlet; the pumping unit includes a pump body, a pumping channel, and a suction channel, wherein, in the working state, the flow rate Q0” of the pumping channel is approximately equal to the flow rate Q0’ of the suction channel; the input end of the pumping channel is connected to the inlet container, and the output end of the pumping channel is connected to the working liquid inlets of the working unit and the liquid balancing unit respectively; the input end of the suction channel is connected to the working area and the waste liquid outlet of the liquid balancing unit respectively; in the working state, the liquid balancing unit contains mutually isolated working liquid and waste liquid; the pumping channel contains… The working fluid is input into the liquid balancing unit at a flow rate of Q2” through the working fluid inlet and into the working area at a flow rate of Q3” through the working unit; that is, the sum of Q3” and Q3” is approximately equal to Q0”. The suction channel extracts at least a portion of the working fluid in the working area as waste liquid at a flow rate of Q3’. The waste liquid stored in the liquid balancing unit enters the suction channel at a flow rate of Q2’ through the waste liquid outlet; that is, the sum of Q2’ and Q3’ is approximately equal to Q0’. The liquid balancing unit enables the flow rate Q2” of the working fluid inlet to be approximately equal to the flow rate Q2’ of the waste liquid outlet; thus, Q3’ and Q3” are approximately equal; that is, the flow rate Q3” of the working fluid entering the working area and the flow rate Q3’ of the waste liquid output from the working area are dynamically balanced.

[0008] In a preferred embodiment, the system includes a waste liquid container for storing waste liquid; the liquid balancing unit further includes a working liquid outlet and a waste liquid inlet; the input end of the pumping channel is connected to the working liquid outlet; the output end of the suction channel is connected to the waste liquid inlet and the waste liquid container, respectively; in the operating state, the working liquid in the inlet container and the liquid balancing unit enters the pumping channel at flow rates Q4” and Q1”, respectively; that is, the sum of Q1” and Q4” is approximately equal to Q0”; the waste liquid in the suction channel enters the pumping channel at a flow rate Q4”. ’ The waste liquid is input into the waste liquid container at a flow rate Q1' through the waste liquid inlet into the liquid balancing unit; that is, the sum of Q4' and Q1' is approximately equal to Q0'; wherein, the liquid balancing unit can make the flow rate Q1" of the working liquid outlet approximately equal to the flow rate Q1' of the waste liquid inlet; thus, Q4' and Q4" are approximately equal; that is, the flow rate Q4" of the working liquid output from the liquid inlet container and the flow rate Q4' of the waste liquid entering the waste liquid container are dynamically balanced.

[0009] In a preferred embodiment, the liquid balancing unit includes a first container, a second container, and a first valve group and a second valve group capable of alternating switching. When the first valve group is open and the second valve group is closed, working liquid input from the working liquid inlet enters the first container at a flow rate Q2”, causing waste liquid in the first container to exit from the waste liquid outlet at a flow rate Q2'. Simultaneously, waste liquid input from the waste liquid inlet enters the second container at a flow rate Q1', causing working liquid in the second container to exit from the working liquid outlet at a flow rate Q1”. When the first valve group is closed and the second valve group is open, working liquid input from the working liquid inlet enters the second container at a flow rate Q2”, causing waste liquid in the second container to exit from the waste liquid outlet at a flow rate Q2'. Simultaneously, waste liquid input from the waste liquid inlet enters the first container at a flow rate Q1', causing working liquid in the first container to exit from the working liquid outlet at a flow rate Q1”.

[0010] In a preferred embodiment, the first container and the second container each have two mutually isolated chambers; when liquid enters one of the two chambers, the liquid in the other chamber is squeezed out of its container in equal amounts.

[0011] In a preferred embodiment, the first container is divided into a first working fluid chamber and a first waste fluid chamber by a first separator; the second container is divided into a second working fluid chamber and a second waste fluid chamber by a second separator; when the first valve group is open and the second valve group is closed, the working fluid input from the working fluid inlet enters the first working fluid chamber, pushing the first separator to deform and / or move towards one side of the first waste fluid chamber, thereby squeezing the waste fluid in the first waste fluid chamber out through the waste fluid outlet; simultaneously, the waste fluid input from the waste fluid inlet enters the second waste fluid chamber, pushing the second separator to deform and / or move towards one side of the second working fluid chamber. The working fluid in the second working fluid chamber is squeezed out through the working fluid outlet when the first valve group is closed and the second valve group is open. The working fluid input from the working fluid inlet enters the second working fluid chamber, pushing the second isolator to deform and / or move to one side of the second waste fluid chamber, thereby squeezing the waste fluid in the second waste fluid chamber out through the waste fluid outlet. At the same time, the waste fluid input from the waste fluid inlet enters the first waste fluid chamber, pushing the first isolator to deform and / or move to one side of the first working fluid chamber, thereby squeezing the working fluid in the first working fluid chamber out through the working fluid outlet.

[0012] In a preferred embodiment, the working fluid inlet is connected to the first working fluid chamber via a first working fluid inlet and to the second working fluid chamber via a second working fluid inlet; the waste fluid outlet is connected to the first waste fluid chamber via a first waste fluid outlet and to the second waste fluid chamber via a second waste fluid outlet; the working fluid outlet is connected to the first working fluid chamber via a first working fluid outlet and to the second working fluid chamber via a second working fluid outlet; the waste fluid inlet is connected to the first waste fluid chamber via a first waste fluid inlet and to the second waste fluid chamber via a second waste fluid inlet; wherein the first working fluid inlet, the first waste fluid outlet, the second working fluid outlet, and the second waste fluid inlet are controlled by the first valve group; the first working fluid outlet, the first waste fluid inlet, the second working fluid inlet, and the second waste fluid outlet are controlled by the second valve group.

[0013] In a preferred embodiment, the first and second spacers are flexible membranes.

[0014] In a preferred embodiment, the output end of the pumping channel is connected to the first operating branch and the second operating branch of the operating unit via a pumping operating branch; the first operating branch is connected in series with a high-pressure pump and a water jet cutter head; in the working state, the output ends of the water jet cutter head and the second operating branch are located in the operating area, and the working fluid enters the first operating branch and the second operating branch from the pumping operating branch at a flow rate Q3”.

[0015] In a preferred embodiment, the working unit further includes a third working branch; in the working state, the input end of the third working branch is located in the working area, and the output end is connected to the input end of the suction channel.

[0016] According to the aforementioned technical solution, this application achieves a balance between the flow rate of the working liquid Q2” input by the liquid balance unit and the flow rate of the waste liquid Q2’ output by it, and the flow rate of the working liquid Q1” output by it and the flow rate of the waste liquid Q1’ input by it. Thus, when the pumping flow rate and suction flow rate of the pumping unit are the same, the balance between the inlet and outlet of the liquid in the working area is achieved, and the flow rate output by the inlet container is equal to the flow rate input in the waste liquid container. Attached Figure Description

[0017] To more clearly illustrate this application, the accompanying drawings will be described and explained below. Obviously, the drawings described below only illustrate certain aspects of some exemplary embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 is a schematic diagram of the liquid conveying device.

[0019] Figure 2 is a schematic diagram of the liquid balance unit.

[0020] Figure 3 is a schematic diagram of the first working state of the liquid balance unit.

[0021] Figure 4 is a schematic diagram of the second working state of the liquid balance unit.

[0022] Figure 5 is a schematic diagram of an embodiment of the first container.

[0023] Figure 6 is a schematic diagram of a mechanical valve assembly.

[0024] Attached Figure Descriptions: 1. Pumping Unit 11. Suction Channel 12. Pumping Channel 121. Pumping Operation Branch 2. Inlet Container 3. Waste Container 4. Liquid Balance Unit 41. First Container 410. First Isolator 411. First Working Liquid Chamber 4101. Rigid Isolation Section 4102. First Flexible Isolation Section 4103. Second Flexible Isolation Section 4111. First Working Liquid Inlet 4112. First Working Liquid Outlet 412. First Waste Liquid Chamber 4121. First Waste Liquid Inlet 4122. First Waste Liquid Outlet 42. Second Container 420. Second Isolator 421. Second Working Liquid Chamber 4211. Second Working Liquid Inlet 4212. Second Working Liquid Outlet 422. Second Waste Liquid Chamber 4221. Second Waste Liquid Inlet 4222. Second Waste Liquid Outlet 431. Working Liquid Inlet 432. Working Liquid Outlet 433. Waste Liquid Inlet 434. Waste Liquid Outlet 441. First Valve Group 442. Second Valve Group 443. First Clamping Section 444 Second clamping section 445, Third clamping section 5, Working unit 51, First working branch 511, High-pressure pump 512, Water jet cutter head 52, Second working branch 53, Third working branch 6, Working area Detailed Implementation

[0025] Various exemplary embodiments of this application are described in detail below with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the application or its application or use. This application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the application thorough and complete, and to fully express the scope of the application to those skilled in the art. It should be noted that, unless otherwise stated, the relative arrangement of components and steps, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0026] As used in this application, the words “including” or “comprising” or similar terms mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility that it may also cover other elements.

[0027] All terms used in this application (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as being interpreted with idealized or highly formalized meanings, unless explicitly defined herein.

[0028] For components, specific model numbers and other parameters of components not described in detail in this section, the interrelationships between components and control circuits, these may be considered as techniques, methods and devices known to those skilled in the art, but where appropriate, such techniques, methods and devices should be considered part of the specification.

[0029] Overall Structure

[0030] First, the overall structure of the liquid conveying device of this application will be described with reference to Figure 1. Figure 1 is a schematic diagram of the structure of the liquid conveying device.

[0031] In practical applications, such as in the medical industry, especially in the surgical field, high-pressure liquid irrigation or tissue ablation (e.g., water jet) is often required. The work area, such as the bladder, is equipped with working fluid inlet channels and waste fluid outlet channels. When it is required that the liquid volume in the work area be stable, it is necessary to precisely control the inlet volume of working fluid and the outlet volume of waste fluid to achieve a balance of volume through equal inlet and outlet of liquid.

[0032] Referring to Figure 1, as one embodiment, the liquid conveying device of this application includes a pumping unit 1, a working unit 5, a liquid balancing unit 4, an inlet container 2, and a waste liquid container 3. The inlet container 2 is used to store the working liquid, and the waste liquid container 3 is used to store waste liquid. The working liquid becomes waste liquid to be extracted after entering the working area 6.

[0033] The liquid balance unit 4 has a working liquid inlet 431, a working liquid outlet 432, a waste liquid inlet 433, and a waste liquid outlet 434. In this embodiment, the pumping unit 1 is a multi-channel peristaltic pump, which has a pump body, a pumping channel 12, and a suction channel 11. Under working conditions, the flow rate Q0” of the pumping channel 12 is equal to the flow rate Q0’ of the suction channel 11, that is, Q0”=Q0’ (Equation 1).

[0034] The input end of the pumping channel 12 is connected to the working liquid outlet 432 of the liquid inlet container 2 and the liquid balance unit 4, respectively, and the output end of the pumping channel 12 is connected to the working liquid inlet 431 of the working unit 5 and the liquid balance unit 4, respectively.

[0035] Specifically, the operating unit 5 includes a first operating branch 51, a second operating branch 52, and a third operating branch 53. The first operating branch 51 is connected in series with a high-pressure pump 511 and a water jet nozzle 512. The water jet nozzle 512 is located within the operating area 6 for ablation and other surgical procedures. The output of the second operating branch 52 is also located within the operating area 6 and is typically used for spraying and rinsing equipment such as endoscopes. The input of the third operating branch 53 is located within the operating area 6, and its output is connected to the suction channel 11 of the pumping unit 1, used to extract working fluid and waste fluid from the operating area 6.

[0036] The output end of the pumping channel 12 is connected to the first operating branch 51 and the second operating branch 52 via the pumping operating branch 121. In the working state, the working liquid in the pumping channel 12 enters the first operating branch 51 and the second operating branch 52 from the pumping operating branch 121 at a flow rate of Q3”, and is used to perform corresponding operations on the tissues or equipment in the operating area 6.

[0037] Referring to Figure 1, the output end of the suction channel 11 is connected to the waste liquid container 3 and the waste liquid inlet 433 of the liquid balance unit 4, respectively; the input end of the suction channel 11 is connected to the waste liquid outlet 434 of the liquid balance unit 4, and is also connected to the working area 6 via the third working branch 53.

[0038] In operation, the liquid balance unit 4 contains isolated working liquid and waste liquid. Under the power of the peristaltic pump, the working liquid in the inlet container 2 and the liquid balance unit 4 enter the pumping channel 12 at flow rates Q4” and Q1” respectively. The pumping channel 12 then feeds the working liquid into the liquid balance unit 4 at a flow rate Q2” through the working liquid inlet 431 and into the working area 6 at a flow rate Q3” through the working unit 5.

[0039] That is, Q3”+Q2”=Q0”=Q1”+Q4” Equation (2);

[0040] The suction channel 11 extracts at least a portion of the working fluid in the work area 6 as waste liquid. The waste liquid extracted from the work area 6 and the waste liquid stored in the liquid balance unit 4 enter the suction channel 11 at flow rates Q3' and Q2', respectively. The suction channel 11 then inputs the waste liquid into the waste liquid container 3 at flow rate Q4' and into the liquid balance unit 4 through the waste liquid inlet 433 at flow rate Q1'.

[0041] That is, Q2'+Q3'=Q0'=Q4'+Q1' (Equation (3));

[0042] Among them, the liquid balance unit 4 can ensure that the flow rate Q2” of the working liquid inlet 431 is always equal to the flow rate Q2’ of the waste liquid outlet 434, and the flow rate Q1” of the working liquid outlet 432 is always equal to the flow rate Q1’ of the waste liquid inlet 433; then, combining equations (1), (2), and (3), we can obtain: Q3’=Q3” (4); Q4’=Q4” (5);

[0043] That is, the flow rate Q3” of the working fluid entering the working area 6 is always equal to the flow rate Q3' of the waste fluid output from the working area 6, thereby achieving a balance between the inflow and outflow of fluid in the working area 6, avoiding the expansion of the working area 6, such as the bladder, due to excessive input of working fluid, or the collapse of the working area 6, such as the bladder, due to excessive extraction of waste fluid.

[0044] More preferably, the flow rate Q4” of the working liquid output from the liquid inlet container 2 is always equal to the flow rate Q4’ of the waste liquid entering the waste liquid container 3, thus achieving a balance of flow rates between the liquid inlet container 2 and the waste liquid container 3.

[0045] It is understandable that, according to the aforementioned scheme, the liquid balance unit 4 only needs to be equipped with a working liquid inlet 431 and a waste liquid outlet 434 to achieve the balance of liquid inflow and outflow within the working area 6. The scheme of setting a working liquid outlet 432 and a waste liquid inlet 433 is only a preferred method to ensure that the flow balance between the liquid inlet container 2 and the waste liquid container 3 is achieved simultaneously.

[0046] It should be noted that although the aforementioned equations (1) to (5) are expressed as mathematical equations, they are difficult to be absolutely equal in actual application as flow systems. This application takes the meaning of approximately equal and dynamic balance.

[0047] Furthermore, in typical scenarios, when the peristaltic pump is used independently, the flow rates between the pumping channel 12 and the suction channel 11 are easily kept consistent. However, when the peristaltic pump serves as the primary pump at the inlet of the high-pressure pump 511, the flow rate of the high-pressure pump 511 fluctuates at a fixed motor speed, making it difficult to achieve perfectly equal flow rates by controlling the motors of both pumps. This means a flow rate difference exists between the peristaltic pump's pumping channel 12 and the high-pressure pump 511, causing fluctuations in the fluid pressure within the pumping operation branch 121 between these two pumps. This results in high or negative pressure conditions within the pipeline, forcing the flow rate of the pumping channel 12 to match that of the high-pressure pump 511, making it difficult to maintain consistent flow rates between the pumping channel 12 and the suction channel 11.

[0048] After setting up the liquid balancing unit 4, this application allows for an appropriate increase in the motor speed of the peristaltic pump during operation. This ensures that the flow rate Q0” in the pumping channel 12 is greater than the flow rate Q3” entering the working area 6, with the excess entering the liquid balancing unit 4 at a flow rate Q2”. Essentially, the liquid balancing unit 4 acts as a diversion channel, automatically diverting the excess flow rate from the pumping channel 12 into the working area 6. This maintains stable flow rate and fluid pressure within the pumping branch 121, preventing pressure fluctuations that could alter the flow rate in the pumping channel 12 and making it easier to maintain consistent flow rates between the pumping channel 12 and the suction channel 11. Furthermore, the liquid balancing unit 4 functions as a black box, eliminating the need for precise control of how much Q0” is greater than Q3”; simply increasing the flow rate in the pumping channel 12 is sufficient, reducing control complexity.

[0049] Liquid balance unit

[0050] Next, the liquid balance unit 4 will be described with reference to Figures 2-6. Figure 2 is a structural schematic diagram of the liquid balance unit 4, Figure 3 is a schematic diagram of the first working state of the liquid balance unit 4, Figure 4 is a schematic diagram of the second working state of the liquid balance unit 4, Figure 5 is a schematic diagram of an embodiment of the first container 41, and Figure 6 is a schematic diagram of the mechanical valve assembly.

[0051] As mentioned above, the key to this application lies in how to ensure that the flow rate of the working liquid Q2” input into the liquid balance unit 4 is always equal to the flow rate of the waste liquid Q2' output, and that the flow rate of the working liquid Q1” output is always equal to the flow rate of the waste liquid Q1' input. This will be explained in detail below.

[0052] Referring to Figure 2, the liquid balancing unit 4 has a first container 41 and a second container 42. Each of the first container 41 and the second container 42 has two mutually isolated chambers; when liquid enters one of these chambers, the liquid in the other chamber is squeezed out in equal amounts. In this embodiment, the first container 41 is divided into a first working liquid chamber 411 and a first waste liquid chamber 412 by a first separator 410; the second container 42 is divided into a second working liquid chamber 421 and a second waste liquid chamber 422 by a second separator 420.

[0053] As shown in Figure 2, the working liquid inlet 431 of the liquid balance unit 4 is connected to the first working liquid chamber 411 of the first container 41 via the first working liquid inlet 4111, and at the same time, the working liquid inlet 431 is connected to the second working liquid chamber 421 of the second container 42 via the second working liquid inlet 4211.

[0054] The waste liquid outlet 434 of the liquid balance unit 4 is connected to the first waste liquid chamber 412 of the first container 41 via the first waste liquid outlet 4122. At the same time, the waste liquid outlet 434 is connected to the second waste liquid chamber 422 of the second container 42 via the second waste liquid outlet 4222.

[0055] The working liquid outlet 432 of the liquid balance unit 4 is connected to the first working liquid chamber 411 of the first container 41 via the first working liquid outlet 4112. At the same time, the working liquid outlet 432 is connected to the second working liquid chamber 421 of the second container 42 via the second working liquid outlet 4212.

[0056] The waste liquid inlet 433 of the liquid balance unit 4 is connected to the first waste liquid chamber 412 of the first container 41 via the first waste liquid inlet 4121. At the same time, the waste liquid inlet 433 is connected to the second waste liquid chamber 422 of the second container 42 via the second waste liquid inlet 4221.

[0057] The liquid balancing unit 4 also has a first valve group 441 and a second valve group 442 that can be switched on and off alternately. The first valve group 441 is used to simultaneously control the on and off of the first working liquid inlet 4111, the first waste liquid outlet 4122, the second working liquid outlet 4212, and the second waste liquid inlet 4221. The second valve group 442 is used to simultaneously control the on and off of the first working liquid outlet 4112, the first waste liquid inlet 4121, the second working liquid inlet 4211, and the second waste liquid outlet 4222.

[0058] As a preferred embodiment, the first container 41 and the second container 42 have the same structure, and the first valve group 441 and the second valve group 442 have the same structure. However, they can also be different from each other, which is not limited here.

[0059] Next, the working principle of liquid balance unit 4 will be explained in detail.

[0060] Referring to Figure 3, when the first valve group 441 is opened and the second valve group 442 is closed, the working liquid input from the working liquid inlet 431 of the liquid balance unit 4 enters the first working liquid chamber 411 from the first working liquid inlet 4111 at a flow rate of Q2”, pushing the first isolation member 410 to deform and / or move to one side of the first waste liquid chamber 412, thereby squeezing the waste liquid in the first waste liquid chamber 412 and outputting it from the waste liquid outlet 434 of the liquid balance unit 4 at a flow rate of Q2' through the first waste liquid outlet 4122. Together with the waste liquid with a flow rate of Q3' extracted from the working area 6, it enters the suction channel 11 of the pumping unit 1, forming the flow rate Q0' of the suction channel 11.

[0061] Since this process is achieved by the deformation and / or movement of the first isolation member 410 to squeeze, the liquid inflow can always be equal to the liquid outflow, i.e., Q2” = Q2’.

[0062] Simultaneously, the waste liquid in the suction channel 11 enters the waste liquid container 3 at a flow rate Q4' and enters the liquid balance unit 4 from the waste liquid inlet 433 at a flow rate Q1'. Referring to Figure 3, the waste liquid input from the waste liquid inlet 433 enters the second waste liquid chamber 422 of the second container 42 at a flow rate Q1' via the second waste liquid inlet 4221, and squeezes the second isolation member 420, causing the second isolation member 420 to deform and / or move towards the side of the second working liquid chamber 421, thereby squeezing the working liquid in the second working liquid chamber 421 at a flow rate Q1” via the second working liquid outlet 4212 to reach the working liquid outlet 432, and together with the working liquid with a flow rate of Q4” drawn from the inlet container 2, enters the pumping channel 12 of the pumping unit 1, forming the flow rate Q0 of the pumping channel 12.

[0063] Since this process is achieved by the deformation and / or movement of the second isolation member 420 to squeeze, the liquid inlet volume can always be equal to the liquid outlet volume, i.e., Q1” = Q1'.

[0064] The working fluid in pumping channel 12 enters the operating unit 5 at a flow rate of Q3” to meet the usage requirements of the first operating branch 51 and the second operating branch 52. At the same time, the excess working fluid enters the liquid balance unit 4 from the working fluid inlet 431 at a flow rate of Q2”. This is the working fluid input from the working fluid inlet 431 of the liquid balance unit 4 mentioned above.

[0065] Referring to Figure 4, when the first valve group 441 is closed and the second valve group 442 is opened, the working liquid input from the working liquid inlet 431 of the liquid balance unit 4 enters the second working liquid chamber 421 of the second container 42 at a flow rate Q2” through the second working liquid inlet 4211. This squeezes the second isolation member 420, causing it to deform and / or move to one side of the second waste liquid chamber 422. This causes the waste liquid in the second waste liquid chamber 422 to reach the waste liquid outlet 434 of the liquid balance unit 4 at a flow rate Q2' through the second waste liquid outlet 4222. Together with the waste liquid drawn from the working area 6 at a flow rate Q3', it enters the suction channel 11 of the pumping unit 1, forming a flow rate Q0' in the suction channel 11.

[0066] Since this process is achieved by the deformation and / or movement of the second isolation member 420 to squeeze, the liquid inflow can always be equal to the liquid outflow, i.e., Q2” = Q2’.

[0067] The waste liquid in the suction channel 11 enters the waste liquid container 3 at a flow rate of Q4', and the rest enters the waste liquid inlet 433 of the liquid balance unit 4 at a flow rate of Q1'. It then enters the first waste liquid chamber 412 of the first container 41 through the first waste liquid inlet 4121, thereby squeezing the first isolation member 410 to deform and / or move it to one side of the first working liquid chamber 411. As a result, the working liquid in the first working liquid chamber 411 reaches the working liquid outlet 432 through the first working liquid outlet 4112 at a flow rate of Q2" and enters the pumping channel 12 of the pumping unit 1 together with the working liquid drawn from the inlet container 2 at a flow rate of Q4" to form the flow rate Q0 in the pumping channel 12.

[0068] Since this process is achieved by the deformation and / or movement of the first isolation member 410 to squeeze, the liquid inflow can always be equal to the liquid outflow, i.e., Q1” = Q1’.

[0069] In summary, this application achieves equal flow of working liquid and waste liquid in and out of the entire liquid balance unit 4 by alternately switching the first valve group 441 and the second valve group 442. Although the types of liquid input and output of a single container are different each time the valve groups switch (e.g., the first container 41 inputs working liquid and outputs an equal amount of waste liquid this time, and the first container 41 inputs waste liquid and outputs working liquid the next time), the overall input of working liquid in the liquid balance unit 4 is equal to the output of waste liquid, and the input of waste liquid is equal to the output of working liquid, thus achieving closed-loop control.

[0070] It is understood that the first isolation member 410 and the second isolation member 420 are preferably flexible diaphragms capable of deformation under liquid pressure. However, they can also be rigid pistons, as long as they can move to the other side under liquid pressure. Alternatively, as shown in Figure 5, taking the first isolation member 410 as an example, it includes a rigid isolation part 4101 and a first flexible isolation part 4102 and a second flexible isolation part 4103, with the first flexible isolation part 4102 and the second flexible isolation part 4103 respectively connected to both ends of the rigid isolation part 4101. When the liquid pressures the first isolation member 410, the rigid isolation part 4101 moves to the other side, and the first flexible isolation part 4102 and the second flexible isolation part 4103 undergo corresponding deformation. The second isolation member 420 has the same structural principle as the first isolation member 410, and will not be described further here.

[0071] In addition, the first valve group 441 and the second valve group 442 can each contain four solenoid valves that control the opening and closing of their respective pipelines, or they can be mechanical valve groups as shown in Figure 6.

[0072] Specifically, the mechanical valve assembly includes a first clamping part 443, a second clamping part 444, and a third clamping part 445. The first working fluid inlet 4111, the first waste fluid outlet 4122, the second working fluid outlet 4212, and the second waste fluid inlet 4221 are clamped between the first clamping part 443 and the second clamping part 444, while the first working fluid outlet 4112, the first waste fluid inlet 4121, the second working fluid inlet 4211, and the second waste fluid outlet 4222 are clamped between the third clamping part 445 and the second clamping part 444.

[0073] Therefore, the first clamping part 443 and the second clamping part 444 are equivalent to the first valve group 441, and the second clamping part 444 and the third clamping part 445 are equivalent to the second valve group 442. By controlling the opening and closing actions of the first clamping part 443 and the third clamping part 445 relative to the second clamping part 444, the opening and closing of the corresponding pipeline can be controlled.

[0074] In summary, this application designs a liquid balance unit 4 in which the input working liquid flow rate Q2” is always equal to the output waste liquid flow rate Q2', and the output working liquid flow rate Q1” is always equal to the input waste liquid flow rate Q1'. Thus, when the pumping flow rate and suction flow rate of the pumping unit 1 are the same, the liquid inflow and outflow balance in the working area 6 is achieved, and the flow rate output from the liquid inlet container 2 is equal to the flow rate input into the waste liquid container 3.

[0075] The key to achieving equal inflow and outflow in the liquid balance unit 4 lies in the arrangement of relevant pipelines and the alternating opening and closing of valve assemblies. In particular, it relies on the deformation and / or movement of the first isolation element 410 and the second isolation element 420 within the two containers to compress the liquid, thereby ensuring that the flow rate entering each container is equal to the flow rate being squeezed out. The entire device is essentially a black box, eliminating the need for tedious calculations of inflow and outflow rates; its ingenious structural design guarantees flow balance.

[0076] It should be understood that the specific embodiments described above are only used to explain this application, and the scope of protection of this application is not limited thereto. Any changes, substitutions, or combinations made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be covered within the scope of protection of this application.

Claims

1. A liquid conveying device, characterized in that: It includes a pumping unit, a working unit, a liquid balancing unit, and an inlet container for storing the working liquid; The liquid balance unit has a working liquid inlet and a waste liquid outlet; The pumping unit includes a pump body, a pumping channel, and a suction channel. Under working conditions, the flow rate Q0” of the pumping channel is approximately equal to the flow rate Q0’ of the suction channel. The input end of the pumping channel is connected to the liquid inlet container, and the output end of the pumping channel is connected to the working liquid inlet of the working unit and the liquid balance unit, respectively. The input end of the suction channel is connected to the working area and the waste liquid outlet of the liquid balance unit, respectively. In operation, the liquid balance unit contains mutually isolated working liquid and waste liquid; The working fluid in the pumping channel is fed into the liquid balance unit at a flow rate of Q2” through the working fluid inlet, and into the working area at a flow rate of Q3” through the working unit; That is, the sum of Q3” and Q2” is approximately equal to Q0”; The suction channel extracts at least a portion of the working liquid in the working area as waste liquid at a flow rate of Q3', and the waste liquid stored in the liquid balance unit enters the suction channel through the waste liquid outlet at a flow rate of Q2'. That is, the sum of Q2' and Q3' is approximately equal to Q0'; The liquid balancing unit ensures that the flow rate Q2” at the working liquid inlet is approximately equal to the flow rate Q2’ at the waste liquid outlet; thus, the following can be obtained: Q3' and Q3" are roughly equal; That is, the flow rate Q3” of the working liquid entering the work area and the flow rate Q3' of the waste liquid output from the work area are dynamically balanced.

2. The liquid conveying device according to claim 1, characterized in that: Includes waste liquid containers for storing waste liquid; The liquid balance unit also has a working liquid outlet and a waste liquid inlet; The input end of the pumping channel is also connected to the working fluid outlet; The output end of the suction channel is connected to the waste liquid inlet and the waste liquid container, respectively; In operation, the working liquid in the inlet container and the liquid balance unit enters the pumping channel at flow rates Q4” and Q1”, respectively. That is, the sum of Q1” and Q4” is approximately equal to Q0”; The waste liquid in the suction channel is input into the waste liquid container at a flow rate of Q4' and into the liquid balance unit through the waste liquid inlet at a flow rate of Q1'. That is, the sum of Q4' and Q1' is approximately equal to Q0'; The liquid balancing unit enables the flow rate Q1” of the working liquid outlet to be approximately equal to the flow rate Q1’ of the waste liquid inlet; thus, the following can be obtained: Q4' and Q4" are roughly equal; That is, the flow rate Q4” of the working liquid output from the liquid inlet container and the flow rate Q4’ of the waste liquid entering the waste liquid container are dynamically balanced.

3. The liquid conveying device according to claim 2, characterized in that: The liquid balance unit has a first container, a second container, and a first valve group and a second valve group that can be switched on and off alternately; When the first valve group is opened and the second valve group is closed, the working liquid input from the working liquid inlet enters the first container at a flow rate Q2”, causing the waste liquid in the first container to be output from the waste liquid outlet at a flow rate Q2'; at the same time, the waste liquid input from the waste liquid inlet enters the second container at a flow rate Q1', causing the working liquid in the second container to be output from the working liquid outlet at a flow rate Q1”; When the first valve group is closed and the second valve group is opened, the working liquid input from the working liquid inlet enters the second container at a flow rate Q2”, causing the waste liquid in the second container to be output from the waste liquid outlet at a flow rate Q2'; at the same time, the waste liquid input from the waste liquid inlet enters the first container at a flow rate Q1', causing the working liquid in the first container to be output from the working liquid outlet at a flow rate Q1”.

4. The liquid conveying device according to claim 3, characterized in that: The first container and the second container each have two isolated chambers; when liquid enters one of the two chambers, the liquid in the other chamber is squeezed out of its container in equal amounts.

5. The liquid conveying device according to claim 4, characterized in that: The first container is divided into a first working liquid chamber and a first waste liquid chamber by a first separator; the second container is divided into a second working liquid chamber and a second waste liquid chamber by a second separator. When the first valve group is opened and the second valve group is closed, the working liquid input from the working liquid inlet enters the first working liquid chamber, pushing the first isolation member to deform and / or move to one side of the first waste liquid chamber, thereby squeezing the waste liquid in the first waste liquid chamber to be output from the waste liquid outlet. Meanwhile, the waste liquid input from the waste liquid inlet enters the second waste liquid chamber, pushing the second isolation member to deform and / or move to one side of the second working liquid chamber, thereby squeezing the working liquid in the second working liquid chamber to be output from the working liquid outlet; When the first valve group is closed and the second valve group is opened, the working fluid input from the working fluid inlet enters the second working fluid chamber, pushing the second isolation member to deform and / or move to one side of the second waste fluid chamber, thereby squeezing the waste fluid in the second waste fluid chamber and outputting it from the waste fluid outlet. Simultaneously, the waste liquid input from the waste liquid inlet enters the first waste liquid chamber, pushing the first isolation member to deform and / or move to one side of the first working liquid chamber, thereby squeezing the working liquid in the first working liquid chamber to be output from the working liquid outlet.

6. The liquid conveying device according to claim 5, characterized in that: The working fluid inlet is connected to the first working fluid chamber via a first working fluid inlet and to the second working fluid chamber via a second working fluid inlet; The waste liquid outlet is connected to the first waste liquid chamber via a first waste liquid outlet path and to the second waste liquid chamber via a second waste liquid outlet path; The working fluid outlet is connected to the first working fluid chamber via a first working fluid outlet path and to the second working fluid chamber via a second working fluid outlet path. The waste liquid inlet is connected to the first waste liquid chamber via a first waste liquid inlet and to the second waste liquid chamber via a second waste liquid inlet; The first working fluid inlet, the first waste fluid outlet, the second working fluid outlet, and the second waste fluid inlet are controlled by the first valve group switch. The first working fluid outlet, the first waste fluid inlet, the second working fluid inlet, and the second waste fluid outlet are controlled by the second valve group switch.

7. The liquid conveying device according to claim 6, characterized in that: The first and second isolation components are flexible membranes.

8. The liquid conveying device according to claim 2, characterized in that: The output end of the pumping channel is connected to the first operating branch and the second operating branch of the operating unit via the pumping operating branch, respectively; The first working branch is connected in series with a high-pressure pump and a water jet cutter head; In the working state, the water jet cutter head and the output end of the second working branch are located in the working area, and the working liquid enters the first working branch and the second working branch from the pumping working branch at a flow rate of Q3".

9. The liquid conveying device according to claim 8, characterized in that: The work unit also includes a third work branch; In operation, the input end of the third working branch is located in the working area, and the output end is connected to the input end of the suction channel.

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