Liquid delivery device

Abstract

The present application provides a liquid delivery device, comprising a pumping unit, an operating unit, a liquid balance unit and a liquid inlet container; the pumping unit is provided with a pumping channel and a suction channel with equal flow rates; in the working state, the working liquid in the pumping channel is respectively input into the liquid balance unit and the operating unit; the suction channel extracts the working liquid in the operating area as waste liquid, and the waste liquid in the liquid balance unit enters the suction channel through the waste liquid outlet; wherein the liquid balance unit can make the flow rate of the working liquid inlet always equal to the flow rate of the waste liquid outlet; and thus the flow rate of the working liquid entering the operating area is always equal to the flow rate of the waste liquid output from the operating area. Accordingly, the liquid inlet and outlet balance can be achieved conveniently and efficiently.

Description

Technical Field

[0001] The present application relates to a liquid delivery device capable of achieving a balance between liquid inflow and outflow. Background Art

[0002] In actual application scenarios such as the medical industry, especially in the surgical field, there is a demand for high-pressure liquid flushing or tissue ablation (such as water jet), which is usually equipped with a liquid input channel and a waste liquid discharge channel connecting the working area.

[0003] When the liquid inventory in the working area is required to be stable, the existing technology usually configures high-precision pumps in two channels and controls the two pumps to operate at equal flow rates. When the accuracy requirement is high, flow meters (weighing, ultrasonic, throttling, etc.) are set in the liquid input channel and the waste liquid discharge channel, and the flow rates of the two pumps are adjusted manually or automatically according to the feedback value of the flow meter, so as to ensure the balance of the inflow and outflow of liquid in the working area and realize closed-loop management.

[0004] However, high-precision pumps are not only expensive, but also cannot guarantee delivery accuracy under high pressure. Even if a servo motor is used to control the pump motor, the flow error will exceed 5% or even 10%; the current flow meter measurement error is generally above 5%. The non-contact flow meters needed in the medical field are not only more expensive but also less accurate, with an error between 5% and 10%. If two flow meters are used together, the total error will usually be higher than 10%. If no intervention is made, the cumulative error will exceed the acceptable range. Therefore, the prior art also requires the configuration of a cumulative error detection device and even requires manual intervention, which not only increases the cost and complexity of the system and reduces robustness, but also turns automated equipment into semi-automated equipment, increases the workload of medical staff, and increases the risk of operational errors.

[0005] Therefore, in the prior art, there is a technical problem of how to achieve liquid inlet and outlet balance conveniently and efficiently. Summary of the invention

[0006] The purpose of the present application is to provide a liquid conveying device that can conveniently and efficiently achieve liquid inflow and outflow balance. In order to achieve the above-mentioned purpose, one scheme of the present application is a liquid conveying device, comprising a pumping unit, an operating unit, a liquid balancing unit and a liquid inlet container for storing working liquid; the liquid balancing unit has a working liquid inlet and a waste liquid outlet; the pumping unit has a pump body, a pumping channel, and a suction channel, and the flow rate Q0" of the pumping channel in a working state is substantially 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 respectively connected to the working liquid inlets of the operating unit and the liquid balancing unit; the input end of the suction channel is respectively connected to the operating area and the waste liquid outlet of the liquid balancing unit; in a working state, the liquid balancing unit contains working liquid and waste liquid isolated from each other; the pumping channel The working liquid is respectively input into the liquid balance unit through the working liquid inlet at a flow rate Q2", and is input into the working area through the working unit at a flow rate Q3", that is, the sum of Q3", is approximately equal to Q0". The suction channel extracts at least part of the working liquid in the working area as waste liquid at a flow rate Q3', and the waste liquid stored in the liquid balance unit enters the suction channel through the waste liquid outlet at a flow rate Q2', that is, the sum of Q2' and Q3' is approximately equal to Q0'. The liquid balance unit can make the flow rate Q2" of the working liquid inlet and the flow rate Q2' of the waste liquid outlet approximately equal. It can be further obtained that: Q3' and Q3" are approximately equal. That is, the flow rate Q3" of the working liquid entering the working area is dynamically balanced with the flow rate Q3' of the waste liquid output from the working area.

[0007] In a preferred embodiment, a waste liquid container for storing waste liquid is included; 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 liquid outlet; the output end of the suction channel is respectively connected to the waste liquid inlet and the waste liquid container; in a working state, the working liquid in the liquid inlet container and the liquid balance unit enters the pumping channel at a flow rate of Q4", and a flow rate of Q1", respectively; that is, the sum of Q1", and Q4", is substantially equal to Q0"; the waste liquid in the suction channel enters the pumping channel at a flow rate of Q4", and a flow rate of Q1", respectively. ’ Input the waste liquid container and input the liquid balance unit through the waste liquid inlet at a flow rate Q1'; that is, the sum of Q4' and Q1' is roughly equal to Q0'; wherein the liquid balance unit can make the flow rate Q1" of the working liquid outlet roughly equal to the flow rate Q1' of the waste liquid inlet; furthermore, it can be obtained that: Q4' and Q4" are roughly equal; that is, the flow rate Q4" of the working liquid output from the liquid inlet container is dynamically balanced with the flow rate Q4' of the waste liquid entering the waste liquid container.

[0008] In a preferred embodiment, the liquid balance unit comprises 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", so that the waste liquid in the first container is 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', so that the working liquid in the second container is 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", so that the waste liquid in the second container is 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', so that the working liquid in the first container is output from the working liquid outlet at a flow rate Q1".

[0009] In a preferred embodiment, the first container and the second container each have two chambers isolated from each other; when liquid enters one of the two chambers, the liquid in the other chamber is squeezed out of the container in equal amounts.

[0010] In a preferred embodiment, the first container is divided into a first working liquid chamber and a first waste liquid chamber by a first isolation member; the second container is divided into a second working liquid chamber and a second waste liquid chamber by a second isolation member; 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; at the same time, 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. or moves, 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 liquid input from the working liquid inlet enters the second working liquid chamber, pushing the second isolation member to deform and / or move toward one side of the second waste liquid chamber, thereby squeezing the waste liquid in the second waste liquid chamber to be output from the waste liquid outlet; at the same time, 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 toward 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.

[0011] In a preferred embodiment, the working liquid inlet is connected to the first working liquid chamber via a first working liquid inlet and to the second working liquid chamber via a second working liquid inlet; the waste liquid outlet is connected to the first waste liquid chamber via a first waste liquid outlet and to the second waste liquid chamber via a second waste liquid outlet; the working liquid outlet is connected to the first working liquid chamber via a first working liquid outlet and to the second working liquid chamber via a second working liquid outlet; 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; wherein, the first working liquid inlet, the first waste liquid outlet, the second working liquid outlet and the second waste liquid inlet are controlled switches by the first valve group; the first working liquid outlet, the first waste liquid inlet, the second working liquid inlet and the second waste liquid outlet are controlled switches by the second valve group.

[0012] In a preferred embodiment, the first isolating member and the second isolating member are flexible membranes.

[0013] In a preferred embodiment, the output end of the pumping channel is connected to the first working branch and the second working branch of the working unit respectively via a pumping working branch; the first working branch is connected in series with a high-pressure pump and a water jet cutter head; in a working state, the water jet cutter head and the output ends 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".

[0014] In a preferred embodiment, the operation unit further comprises a third operation branch; in a working state, an input end of the third operation branch is located in the operation area, and an output end is connected to an input end of the suction channel.

[0015] According to the aforementioned technical solution, in the present application, the working liquid flow Q2" input by the liquid balance unit is always equal to the waste liquid flow Q2' output, and the output working liquid flow Q1" is always equal to the waste liquid flow Q1' input. Thus, when the pumping flow and suction flow of the pumping unit are the same, the inflow and outflow balance of the liquid in the working area is achieved, and the flow output from the liquid inlet container is equal to the flow input into the waste liquid container. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the present application, the drawings of the specification of the present application will be described and illustrated below. Obviously, the drawings in the following description only illustrate certain aspects of some exemplary embodiments of the present application, and it is possible for a person of ordinary skill in the art to obtain other drawings based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of a liquid delivery device.

[0018] Figure 2 It is a structural schematic diagram of the liquid balance unit.

[0019] Figure 3 This is a schematic diagram of the first working state of the liquid balance unit.

[0020] Figure 4 This is a schematic diagram of the second working state of the liquid balance unit.

[0021] Figure 5 is a schematic diagram of an embodiment of a first container.

[0022] Figure 6 It is a schematic diagram of a mechanical valve group.

[0023] Caption of the attached figure:

[0024] 1 Pumping unit

[0025] 11 Suction channel

[0026] 12 Pumping channel

[0027] 121 Pumping operation branch

[0028] 2 Liquid inlet container

[0029] 3 Waste container

[0030] 4 Liquid balance unit

[0031] 41 First Container

[0032] 410 first isolator

[0033] 411 first working liquid chamber

[0034] 4101 Rigid Isolation Section

[0035] 4102 First flexible isolation part

[0036] 4103 Second flexible isolation part

[0037] 4111 First working fluid inlet

[0038] 4112 First working liquid outlet

[0039] 412 First waste liquid chamber

[0040] 4121 First waste liquid inlet

[0041] 4122 First waste liquid outlet

[0042] 42 Second Container

[0043] 420 Second isolation member

[0044] 421 Second working liquid chamber

[0045] 4211 Second working fluid inlet

[0046] 4212 Second working liquid outlet

[0047] 422 Second waste chamber

[0048] 4221 Second waste liquid inlet

[0049] 4222 Second waste liquid outlet

[0050] 431 Working fluid inlet

[0051] 432 Working fluid outlet

[0052] 433 Wastewater inlet

[0053] 434 Waste liquid outlet

[0054] 441 First valve group

[0055] 442 Second valve group

[0056] 443 First clamping part

[0057] 444 Second clamping part

[0058] 445 Third clamping part

[0059] 5 Operation Units

[0060] 51 First operating branch

[0061] 511 High Pressure Pump

[0062] 512 Waterjet Head

[0063] 52 Second operating branch

[0064] 53 The third operating branch

[0065] 6 Working Area DETAILED DESCRIPTION

[0066] Various exemplary embodiments of the present application are described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is by no means intended to limit the present application and its application or use. The present application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present application thorough and complete and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise stated, the relative arrangement of the components and steps, numerical expressions, and numerical values, etc., described in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0067] The words “include” or “comprising” and the like used in this application mean that the elements preceding the words include the elements listed after the words, and do not exclude the possibility of also including other elements.

[0068] All terms (including technical terms or scientific terms) used in this application have the same meaning as those understood by ordinary technicians in the field to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be understood to have the same meaning as their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined in this article.

[0069] Components not described in detail in this section, parameters such as specific models of components, relationships between components, and control circuits may be considered as technologies, methods, and equipment known to ordinary technicians in the relevant fields, but in appropriate circumstances, such technologies, methods, and equipment should be considered as part of the specification.

[0070] Overall structure

[0071] First refer to Figure 1 The overall structure of the liquid delivery device of the present application is described. Figure 1 It is a structural schematic diagram of a liquid delivery device.

[0072] In actual application scenarios, such as the medical industry, especially the surgical field, high-pressure liquid flushing or tissue ablation (such as water jet) is often required, and the working area, such as the bladder, is equipped with a working liquid input channel and a waste liquid discharge channel. When the liquid inventory in the working area is required to be stable, it is necessary to accurately control the input volume of the working liquid and the waste liquid discharge volume, and achieve inventory balance by equal amounts of liquid in and out.

[0073] See also Figure 1 As an embodiment, the liquid delivery device of the present application comprises a pumping unit 1, an operating unit 5, a liquid balance unit 4, a liquid inlet container 2, and a waste liquid container 3. The liquid inlet container 2 is used to store the working liquid, and the waste liquid container 3 is used to store the waste liquid. After the working liquid enters the operating area 6, it becomes the waste liquid to be extracted.

[0074] 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. In the working state, the flow rate Q0" of the pumping channel 12 is equal to the flow rate Q0' of the suction channel 11, that is,

[0075] Q0”=Q0' (Formula 1).

[0076] The input end of the pumping channel 12 is connected to the liquid inlet container 2 and the working liquid outlet 432 of the liquid balance unit 4 respectively, and the output end of the pumping channel 12 is connected to the working unit 5 and the working liquid inlet 431 of the liquid balance unit 4 respectively.

[0077] Specifically, the operation unit 5 includes a first operation branch 51, a second operation branch 52, and a third operation branch 53. The first operation branch 51 is provided with a high-pressure pump 511 and a water jet cutter head 512 in series. The water jet cutter head 512 is located in the operation area 6 for performing surgical operations such as ablation. The output end of the second operation branch 52 is also located in the operation area 6, and is usually used for spraying and flushing equipment such as endoscopes. The input end of the third operation branch 53 is located in the operation area 6, and the output end is connected to the suction channel 11 of the pumping unit 1, and is used to extract the working liquid operation waste liquid in the operation area 6.

[0078] Among them, the output end of the pumping channel 12 is connected to the first working branch 51 and the second working branch 52 respectively via the pumping working branch 121; in the working state, the working fluid in the pumping channel 12 enters the first working branch 51 and the second working branch 52 from the pumping working branch 121 at a flow rate Q3", which is used to perform corresponding operations on the tissues or equipment in the working area 6.

[0079] Continue to view 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 connected to the working area 6 via the third working branch 53.

[0080] In the working state, the liquid balance unit 4 contains mutually isolated working liquid and waste liquid. Under the power of the peristaltic pump, the working liquid in the liquid inlet container 2 and the liquid balance unit 4 enters the pumping channel 12 at a flow rate of Q4" and a flow rate of Q1", respectively. The pumping channel 12 then inputs the working liquid into the liquid balance unit 4 at a flow rate of Q2" through the working liquid inlet 431 and into the working area 6 at a flow rate of Q3" through the working unit 5;

[0081] That is, Q3”+Q2”=Q0”=Q1”+Q4” Formula (2);

[0082] The suction channel 11 extracts at least part of the working liquid in the working area 6 as waste liquid, wherein the waste liquid extracted in the working 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';

[0083] That is, Q2'+Q3'=Q0'=Q4'+Q1' (3);

[0084] The liquid balance unit 4 can make the flow rate Q2" of the working liquid inlet 431 always equal to the flow rate Q2' of the waste liquid outlet 434, and the flow rate Q1" of the working liquid outlet 432 always equal to the flow rate Q1' of the waste liquid inlet 433; and then, by combining equations (1), (2), and (3), we can get:

[0085] Q3'=Q3” Formula (4);

[0086] Q4'=Q4” Formula (5);

[0087] That is, the flow rate Q3" of the working liquid entering the working area 6 is always equal to the flow rate Q3' of the waste liquid output from the working area 6, thereby achieving a balance between the inflow and outflow of the liquid in the working area 6, and avoiding the expansion of the working area 6, such as the bladder, caused by excessive input of working liquid, or the shrinkage of the working area 6, such as the bladder, caused by excessive extraction of waste liquid.

[0088] Further 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 , thereby achieving a balance in the flow rates between the liquid inlet container 2 and the waste liquid container 3 .

[0089] It can be understood that according to the above scheme, the liquid balance unit 4 only needs to be provided with a working liquid inlet 431 and a waste liquid outlet 434 to achieve the balance of the liquid inlet and outlet in the working area 6. The scheme of providing the working liquid outlet 432 and the waste liquid inlet 433 is only a preferred way to ensure that the flow balance between the liquid inlet container 2 and the waste liquid container 3 is achieved at the same time.

[0090] It should be noted that although the above formulas (1) to (5) are expressed as mathematical equations, it is difficult for them to be absolutely equal in actual application as a flow system. In this application, they are roughly equal and dynamically balanced.

[0091] In addition, in a common scenario, when the peristaltic pump is used independently, the flow rate between the pumping channel 12 and the suction channel 11 is easy to keep consistent. However, when the peristaltic pump is used as the primary pump of the water inlet of the high-pressure pump 511, since the flow rate of the high-pressure pump 511 at a fixed motor speed will fluctuate, it is difficult to control the motors of the high-pressure pump 511 and the peristaltic pump to make the flow rates of the two pumps completely equal. That is, there will be a flow difference between the pumping channel 12 of the peristaltic pump and the high-pressure pump 511, resulting in fluctuations in the fluid pressure in the pipeline of the pumping operation branch 121 between the two pumps, that is, high pressure or negative pressure will appear in the pipeline, thereby forcing the flow rate of the pumping channel 12 to change to be consistent with the high-pressure pump 511, resulting in the flow rate between the pumping channel 12 and the suction channel 11 being difficult to keep consistent.

[0092] After the liquid balance unit 4 is set in the present application, the motor speed of the peristaltic pump can be appropriately increased during the operation process, so that the flow rate Q0" of the pumping channel 12 is greater than the flow rate Q3" entering the working area 6, and the excess part enters the liquid balance unit 4 at the flow rate Q2". It is equivalent to treating the liquid balance unit 4 as a diversion channel, and the excess flow of the pumping channel 12 than that entering the working area 6 is automatically diverted into the liquid balance unit 4, so that the flow rate and fluid pressure in the pipeline of the pumping operation branch 121 are kept stable, thereby avoiding the change of the flow rate of the pumping channel 12 due to the fluctuation of the fluid pressure in the pipeline, and making it easier to keep the flow rate between the pumping channel 12 and the suction channel 11 consistent. In addition, the liquid balance unit 4 is equivalent to a black box. There is no need to accurately control how much larger Q0" is than Q3". It only needs to appropriately increase the flow rate of the pumping channel 12, which reduces the control complexity.

[0093] Liquid balance unit

[0094] Next, combine Figure 2-6 The liquid balance unit 4 will be described. Figure 2 is a schematic diagram of the structure 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, Figure 6 It is a schematic diagram of a mechanical valve group.

[0095] As can be seen from the foregoing, the key to this application is how to make the working liquid flow rate Q2" input into the liquid balance unit 4 always equal to the waste liquid flow rate Q2' output, and the output working liquid flow rate Q1" always equal to the waste liquid flow rate Q1' input. This will be described in detail below.

[0096] See also Figure 2, the liquid balance unit 4 has a first container 41 and a second container 42. The first container 41 and the second container 42 each have two chambers isolated from each other; when liquid enters one of the two chambers, the liquid in the other chamber is squeezed out of the container 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 isolation member 410; the second container 42 is divided into a second working liquid chamber 421 and a second waste liquid chamber 422 by a second isolation member 420.

[0097] like Figure 2 As shown, the working liquid inlet 431 of the liquid balancing 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 .

[0098] 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 , and is connected to the second waste liquid chamber 422 of the second container 42 via the second waste liquid outlet 4222 .

[0099] 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 , and is connected to the second working liquid chamber 421 of the second container 42 via the second working liquid outlet 4212 .

[0100] 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 , and is connected to the second waste liquid chamber 422 of the second container 42 via the second waste liquid inlet 4221 .

[0101] The liquid balance 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 opening and closing 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, and the second valve group 442 is used to simultaneously control the opening and closing 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.

[0102] 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. In fact, they may also be different from each other, which is not limited here.

[0103] Next, the working principle of the liquid balance unit 4 will be described in detail.

[0104] See also 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 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 to be output from the waste liquid outlet 434 of the liquid balance unit 4 through the first waste liquid outlet 4122 at a flow rate Q2', and enters the suction channel 11 of the pumping unit 1 together with the waste liquid with a flow rate Q3' extracted from the working area 6, forming a flow rate Q0' of the suction channel 11.

[0105] Since this process is achieved by extrusion through deformation and / or movement of the first isolating member 410, the liquid inflow amount is always equal to the liquid outflow amount, that is, Q2"=Q2'.

[0106] At the same time, 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'. Figure 3 The waste liquid input from the waste liquid inlet 433 enters the second waste liquid chamber 422 of the second container 42 through the second waste liquid inlet 4221 at a flow rate Q1', and squeezes the second isolation member 420, causing the second isolation member 420 to deform and / or move toward one side of the second working liquid chamber 421, and then squeezes the working liquid in the second working liquid chamber 421 at a flow rate Q1" through the second working liquid outlet 4212 to reach the working liquid outlet 432, and enters the pumping channel 12 of the pumping unit 1 together with the working liquid with a flow rate Q4" drawn from the liquid inlet container 2, forming a flow rate Q0" of the pumping channel 12.

[0107] Since this process is achieved by extrusion through deformation and / or movement of the second isolating member 420, the liquid inflow amount is always equal to the liquid outflow amount, that is, Q1″=Q1′.

[0108] The working liquid in the pumping channel 12 enters the working unit 5 at a flow rate of Q3″ to meet the use requirements of the first working branch 51 and the second working branch 52. At the same time, the excess working liquid enters the liquid balance unit 4 from the working liquid inlet 431 at a flow rate of Q2″. This is the working liquid input from the working liquid inlet 431 of the liquid balance unit 4 mentioned above.

[0109] See also Figure 4When 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 through the second working liquid inlet 4211 at a flow rate Q2", squeezes the second isolation member 420 to deform and / or move to one side of the second waste liquid chamber 422, so that the waste liquid in the second waste liquid chamber 422 reaches the waste liquid outlet 434 of the liquid balance unit 4 through the second waste liquid outlet 4222 at a flow rate Q2', and enters the suction channel 11 of the pumping unit 1 together with the waste liquid extracted from the working area 6 at a flow rate Q3', forming a flow rate Q0' in the suction channel 11.

[0110] Since this process is achieved by extrusion through deformation and / or movement of the second isolating member 420, the liquid inflow amount is always equal to the liquid outflow amount, that is, Q2"=Q2'.

[0111] Part of 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', and 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, thereby causing the working liquid in the first working liquid chamber 411 to reach 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 extracted from the liquid inlet container 2 at a flow rate of Q4", forming a flow rate Q0" in the pumping channel 12.

[0112] Since this process is achieved by extrusion through deformation and / or movement of the first isolating member 410, the liquid inflow amount is always equal to the liquid outflow amount, that is, Q1″=Q1′.

[0113] In summary, the present application alternately switches the first valve group 441 and the second valve group 442, so that the working liquid and the waste liquid in the first container 41 and the second container 42 alternately enter and exit in equal amounts, thereby achieving equal amounts of working liquid and waste liquid entering and exiting the entire liquid balance unit 4. Although the types of liquids input and outputted by a single container are different each time the valve group is alternated, for example, the first container 41 inputs working liquid and outputs waste liquid in equal amounts this time, and the first container 41 inputs waste liquid and outputs working liquid in equal amounts next time, but overall, the input amount of working liquid in the liquid balance unit 4 is equal to the output amount of waste liquid, and the input amount of waste liquid is equal to the output amount of working liquid, thereby achieving closed-loop control.

[0114] It is understood that the first isolating member 410 and the second isolating member 420 are preferably flexible diaphragms that can be deformed under the pressure of liquid. However, they can also be rigid pistons as long as they can move to the other side under the pressure of liquid. Figure 5As shown, taking the first isolating member 410 as an example, it includes a rigid isolating portion 4101 and a first flexible isolating portion 4102 and a second flexible isolating portion 4103, wherein the first flexible isolating portion 4102 and the second flexible isolating portion 4103 are respectively connected to the two ends of the rigid isolating portion 4101. When the liquid squeezes the first isolating member 410, the rigid isolating portion 4101 moves toward the other side, and the first flexible isolating portion 4102 and the second flexible isolating portion 4103 are deformed accordingly. The second isolating member 420 has the same structural principle as the first isolating member 410, and will not be described here.

[0115] In addition, the first valve group 441 and the second valve group 442 may each include four solenoid valves for controlling the on-off of their respective pipelines, or may be Figure 6 Mechanical valve block shown.

[0116] Specifically, the mechanical valve group includes a first clamping portion 443, a second clamping portion 444, and a third clamping portion 445, and 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 are clamped between the first clamping portion 443 and the second clamping portion 444, and 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 are clamped between the third clamping portion 445 and the second clamping portion 444.

[0117] Thus, 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. The opening and closing of the corresponding pipeline can be controlled 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.

[0118] In summary, the present application designs a liquid balance unit 4, wherein the working liquid flow rate Q2" input thereto is always equal to the waste liquid flow rate Q2' output thereto, and the working liquid flow rate Q1" output thereto is always equal to the waste liquid flow rate Q1' input thereto, thereby achieving a balance in the inflow and outflow of the liquid in the working area 6 when the pumping flow rate and the suction flow rate of the pumping unit 1 are the same, and also achieving the flow rate output from the liquid inlet container 2 being equal to the flow rate input into the waste liquid container 3.

[0119] The key to the equal inflow and outflow of the liquid balance unit 4 is to ensure that the flow rate entering each container is equal to the flow rate squeezed out through the arrangement of relevant pipelines and the alternating opening and closing of the valve group, especially through the deformation and / or movement of the first isolation member 410 and the second isolation member 420 in the two containers. The whole device is equivalent to a black box, and the flow balance is ensured through the sophisticated structural design without the need for tedious calculation of the inflow and outflow of liquid.

[0120] It should be understood that the specific embodiments described above are only used to explain the present application, and the protection scope of the present application is not limited thereto. Any technical personnel familiar with the technical field can make changes, substitutions, and combinations within the technical scope disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. A liquid delivery device, characterized in that: It includes a pumping unit, an operating unit, a liquid balancing unit and a liquid inlet container for storing working liquid; The liquid balance unit has a working liquid inlet and a waste liquid outlet; The pumping unit comprises a pump body, a pumping channel and a suction channel, and the flow rate Q0" of the pumping channel is substantially equal to the flow rate Q0' of the suction channel in a working state; 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 inlets of the operating 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 the working state, the liquid balance unit contains working liquid and waste liquid isolated from each other; The working liquid in the pumping channel is respectively input into the liquid balance unit through the working liquid inlet at a flow rate of Q2", and is input into the working area through the working unit at a flow rate of Q3"; That is, the sum of Q3” and Q2” is roughly equal to Q0”; The suction channel extracts at least part of the working liquid in the working area as waste liquid at a flow rate Q3', and the waste liquid stored in the liquid balance unit enters the suction channel through the waste liquid outlet at a flow rate Q2'; That is, the sum of Q2' and Q3' is roughly equal to Q0'; The liquid balance unit can make the flow rate Q2" of the working liquid inlet and the flow rate Q2' of the waste liquid outlet substantially equal; thus: Q3' is roughly equal to Q3"; That is, the flow rate Q3" of the working liquid entering the working area is dynamically balanced with the flow rate Q3' of the waste liquid output from the working area. The liquid balancing unit comprises 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", so that the waste liquid in the first container is output from the waste liquid outlet at a flow rate Q2'; 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", so that the waste liquid in the second container is output from the waste liquid outlet at a flow rate Q2'; The first container and the second container each have two chambers isolated from each other; when liquid enters one of the two chambers, the liquid in the other chamber is squeezed out of the container in equal amounts.

2. The liquid delivery device according to claim 1, characterized in that: including a waste container 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 liquid outlet; The output end of the suction channel is connected to the waste liquid inlet and the waste liquid container respectively; In the working state, the working liquid in the liquid 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 roughly equal to Q0”; The waste liquid in the suction channel is respectively input into the waste liquid container at a flow rate Q4' and input into the liquid balance unit through the waste liquid inlet at a flow rate Q1'; That is, the sum of Q4' and Q1' is roughly equal to Q0'; The liquid balance unit can make the flow rate Q1" of the working liquid outlet and the flow rate Q1' of the waste liquid inlet substantially equal; thus: Q4' is roughly equal to Q4"; That is, the flow rate Q4" of the working liquid output from the liquid inlet container is dynamically balanced with the flow rate Q4' of the waste liquid entering the waste liquid container. When the first valve group is opened and the second valve group is closed, the waste liquid input from the waste liquid inlet enters the second container at a flow rate Q1', so that the working liquid in the second container is 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 waste liquid input from the waste liquid inlet enters the first container at a flow rate Q1', so that the working liquid in the first container is output from the working liquid outlet at a flow rate Q1".

3. The liquid delivery device according to claim 2, characterized in that: The first container is divided into a first working liquid chamber and a first waste liquid chamber by a first isolation member; the second container is divided into a second working liquid chamber and a second waste liquid chamber by a second isolation member; 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 toward 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; At the same time, 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 toward 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 liquid input from the working liquid inlet enters the second working liquid chamber, pushing the second isolation member to deform and / or move toward one side of the second waste liquid chamber, thereby squeezing the waste liquid in the second waste liquid chamber to be output from the waste liquid outlet; At the same time, 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 toward 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.

4. The liquid delivery device according to claim 3, characterized in that: The working liquid inlet is connected to the first working liquid chamber via a first working liquid inlet and is connected to the second working liquid chamber via a second working liquid inlet; The waste liquid outlet is connected to the first waste liquid chamber via a first waste liquid outlet, and is connected to the second waste liquid chamber via a second waste liquid outlet; The working liquid outlet is connected to the first working liquid chamber via a first working liquid outlet, and is connected to the second working liquid chamber via a second working liquid outlet; The waste liquid inlet is connected to the first waste liquid chamber via a first waste liquid inlet and is connected to the second waste liquid chamber via a second waste liquid inlet; Wherein, the first working liquid inlet, the first waste liquid outlet, the second working liquid outlet, and the second waste liquid inlet are controlled on and off by the first valve group; The first working liquid outlet, the first waste liquid inlet, the second working liquid inlet, and the second waste liquid outlet are controlled to be switched by the second valve group.

5. The liquid delivery device according to claim 4, characterized in that: The first isolating member and the second isolating member are flexible membranes.

6. The liquid delivery device according to claim 2, characterized in that: The output end of the pumping channel is connected to the first working branch and the second working branch of the working unit respectively via the pumping working 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 water jet cutter head and the output end of the second working branch are located in the working area, and the working fluid enters the first working branch and the second working branch from the pumping working branch at a flow rate Q3".

7. The liquid delivery device according to claim 6, characterized in that: The operation unit further comprises a third operation 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.

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