Pressure relief device of water jet scalpel system and water jet scalpel system
By designing a pressure relief device in the waterjet system, the switching unit and reset mechanism are used to accelerate the pressure relief of high-pressure fluid, the problem of residual energy damage to the tissue when the waterjet system stops running is solved, rapid pressure relief is achieved, and the tissue is reduced damage.
Patent Information
- Application Number
- CN202411453744.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2024-12-20
AI Technical Summary
When the existing medical water jet system is stopped, the residual energy in the high-pressure tube continues to be discharged through the water jet head, resulting in unnecessary damage to the tissue. The prior art is difficult to effectively improve the residual energy release efficiency.
A pressure relief device is designed, including a first branch and a switching unit in communication with the main flow path. The switching unit is disconnected when the pumping device is started and turned on when the machine is shut down. The high-pressure fluid is accelerated through the reset mechanism and the connecting rod piston structure. Pressure relief speed and counter-pressure is offset through the second branch, increasing operational convenience and reducing energy consumption.
The pressure relief speed of high-pressure fluid is significantly accelerated, and the damage to tissue is reduced. The pressure relief time is reduced from 1-3 seconds to the millisecond level, improving the efficiency of residual energy release.
Smart Images
Figure CN119157609A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a pressure relief device of a water jet system and a water jet system capable of improving the release efficiency of residual energy. Background Art
[0002] In commonly used medical water jets and other instruments, when working, the fluid is pressurized by a booster pumping device and reaches the water jet head through a slender high-pressure pipe, and is ejected from the nozzle of the cutter head to form a high-pressure jet, which is used for debridement, ablation, cutting and other operations.
[0003] When the booster pumping device stops running, the residual energy in the tube will continue to be released through the nozzle of the water jet cutter head due to factors such as the expansion of the high-pressure tube wall. During this pressure release process, although the operator has stopped the operation of the instrument, the residual energy will still cause damage to the tissue.
[0004] If a special situation occurs during the operation and the energy output must be stopped urgently, the existing equipment will stop the rotation of the motor of the booster pumping device regardless of whether the doctor releases the foot pedal or presses the emergency stop button. There is still a risk of residual energy in the pipeline causing damage to the tissue.
[0005] Therefore, in the prior art, how to improve the release efficiency of residual energy and thereby reduce unnecessary damage to tissues has become a technical issue. Summary of the invention
[0006] The purpose of the present application is to provide a pressure relief device for a waterjet system that can improve the residual energy release efficiency. In order to achieve the above purpose, one scheme of the present application is a pressure relief device for a waterjet system, the waterjet system includes a waterjet head, a pumping device, and a main flow connecting the waterjet head and the pumping device; the pressure relief device includes a first branch connected to the main flow and a switch unit; the switch unit is used to control the connection / disconnection between the main flow and the first branch; when the pumping device is started, in response to the start of the pumping device, the switch unit is closed, and then the main flow is disconnected from the first branch, and the fluid output by the pumping device reaches the waterjet head through the main flow and is ejected; when the pumping device is stopped, in response to the stop of the pumping device, the switch unit is opened, and then the main flow is connected to the first branch, and the fluid in the main flow is at least partially discharged through the first branch.
[0007] In a preferred embodiment, a reset mechanism is included; when the pumping device switches from a start state to a stop state, the reset mechanism drives the switch unit to switch to an open state.
[0008] In a preferred embodiment, the switch unit includes a first connecting rod arranged on the first branch, and a first piston connected to the first connecting rod; when the pumping device is started, the first connecting rod drives the first piston to move to the connection between the main flow and the first branch under the action of an external force applied synchronously with the start of the pumping device, thereby disconnecting the main flow from the first branch; when the pumping device is stopped, the external force applied to the first connecting rod is removed synchronously with the stop of the pumping device, and the first piston is moved away from the connection between the main flow and the first branch under the drive of the reset mechanism, and the main flow is connected to the first branch.
[0009] In a preferred embodiment, it includes a second branch connected to the main flow; the switch unit includes a balancing link connected to the first link, and a second link connected to the balancing link and arranged on the second branch; the balancing link extends roughly along the direction of the main flow and is mounted on a link support; wherein a second piston is connected to the end of the second link away from the balancing link.
[0010] In a preferred embodiment, the reset mechanism is an elastic member connected to the balancing connecting rod or the first connecting rod; when the pumping device is started, the reset mechanism deforms and accumulates force as the first connecting rod moves; when the pumping device is stopped, the reset mechanism rebounds and drives the first piston to move away from the connection between the main flow and the first branch via the first connecting rod, and the main flow is connected to the first branch.
[0011] In a preferred embodiment, a closing drive unit is included; as the pumping device is started, the first connecting rod pushes the first piston to the connection between the main flow and the first branch flow under the action of the external force synchronously applied by the closing drive unit.
[0012] In a preferred embodiment, assuming that the pressure exerted by the fluid in the main flow path on the first piston relative to the torque of the connecting rod support is M1, and the pressure exerted by the fluid in the main flow path on the second piston relative to the torque of the connecting rod support is M2, then the difference between M1 and M2 is within a predetermined threshold range.
[0013] In a preferred embodiment, the connecting rod support can reciprocate between a first position close to the first connecting rod and a second position close to the second connecting rod. Let the moment of the pressure exerted by the fluid in the main flow path on the first piston with respect to the connecting rod support be M1, and the moment of the pressure exerted by the fluid in the main flow path on the second piston with respect to the connecting rod support be M2. When the pumping device is started, the connecting rod support is located at the first position, M1 < M2 and the difference between the two exceeds a pre-specified threshold range. Thus, under the action of the moment difference between M1 and M2, the first connecting rod drives the first piston to move towards the main flow path, disconnecting the main flow path from the first branch. When the pumping device is stopped, the connecting rod support is moved to the second position, M1 > M2 and the difference between the two exceeds the threshold range. Thus, under the action of the moment difference between M1 and M2, the first connecting rod drives the first piston to move away from the main flow path, connecting the main flow path to the first branch.
[0014] In a preferred embodiment, the minimum cross-sectional area of the first branch is not less than 5 times the cross-sectional area of the nozzle of the water jet cutter head.
[0015] In a preferred embodiment, the area at the connection of the main flow path and the first branch is smaller than the maximum cross-sectional area of the first branch.
[0016] In addition, another aspect of the present application is a water jet system, comprising a pumping device, a water jet cutter head, and a main flow path connecting the pumping device and the water jet cutter head; and a pressure relief device of the aforementioned water jet system.
[0017] According to the foregoing technical solution, by additionally providing a first branch outside the water jet cutter head and a switch unit that synchronously closes / opens with the start / stop of the pumping device, the pressure relief speed of the high-pressure fluid in the main flow path can be greatly increased. At the same time, by providing a second branch, part of the reverse pressure of the high-pressure fluid can be offset, increasing operational convenience and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] To illustrate the present application more clearly, the accompanying drawings of the present application will be described and explained below. Obviously, the drawings in the following description only illustrate certain aspects of some exemplary embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0019] Figure 1 It is a schematic diagram of a water jet system and the pressure relief device of Embodiment 1.
[0020] Figure 2 It is a schematic diagram of a water jet system and the pressure relief device of Embodiment 2.
[0021] Caption of the attached figure:
[0022] 1 Pumping device
[0023] 11 Main Road
[0024] 110 Connection port
[0025] 2 Waterjet heads
[0026] 21 Working jet
[0027] 3 Pressure relief device
[0028] 30 Closing drive unit
[0029] 310 Pressure relief port
[0030] 31 First Branch Road
[0031] 311 First Piston
[0032] 312 First connecting rod
[0033] 3121 First Rotating Axis
[0034] 32 Second Branch Road
[0035] 321 Second Piston
[0036] 322 Second connecting rod
[0037] 3221 Second Rotating Axis
[0038] 33 Balance connecting rod
[0039] 331 First Balance Tank
[0040] 332 Second balance tank
[0041] 34 Connecting rod support
[0042] 341 Support shaft
[0043] 35 Elastic parts DETAILED DESCRIPTION
[0044] 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.
[0045] 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.
[0046] 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 meanings consistent with 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.
[0047] 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.
[0048] Overall composition
[0049] First refer to Figure 1 The overall structure of the pressure relief device 3 of the present application is described. Figure 1 Schematic diagram of the water jet system and the pressure relief device 3 of the first embodiment.
[0050] like Figure 1 As shown, the water jet system includes a pumping device 1 and a water jet head 2, and the pumping device 1 and the water jet head 2 are connected via a main flow path 11. During the operation, when the water jet system needs to work, the pumping device 1 is started, and the pressurized fluid generated by the pumping device 1 generates a very large pressure in the high-pressure pipe of the main flow path 11, and is ejected from the nozzle of the water jet head 2 to form an operating jet 21, and the kinetic energy and cavitation effect of the operating jet 21 are relied on to achieve operations such as debridement, ablation, and cutting.
[0051] For the sake of convenience, the present application takes the direction indicated by the arrow in the main flow path 11 as the front-to-back direction, that is, the upstream side of the fluid in the main flow path 11 is the front side and the downstream side is the rear side. Figure 1The direction perpendicular to the front and back in the viewing angle is the up and down direction, wherein from the position of the water jet cutter head 2 in the figure, the direction close to the main flow path 11 is the down direction, and the direction far from the main flow path 11 is the up direction.
[0052] When the pumping device 1 stops, due to factors such as the expansion of the wall of the high-pressure pipe, the residual energy in the main flow path 11 will not stop being output immediately, but will continue to be released through the nozzle of the water jet cutter head 2. This pressure relief process usually takes 1 to 3 seconds. For instruments with a working pressure exceeding 70Mpa or a long high-pressure pipe, a longer pressure relief time may be required. During this pressure relief time, although the operation of the external instrument has stopped, the residual energy in the main flow path 11 will still cause unnecessary damage to the tissue.
[0053] For this purpose, see Figure 1 The present application provides a pressure relief device 3, which includes a first branch 31 connected to the main flow path 11 and a switch unit; the switch unit is used to control the connection / disconnection between the main flow path 11 and the first branch 31. The first branch 31 is connected to a pressure relief port 310. Preferably, the first branch 31 is vertically arranged relative to the main flow path 11 as shown in the figure, but in fact, the extension direction of the first branch 31 relative to the main flow path 11 is not limited thereto.
[0054] When the pumping device 1 is started, the switch unit is closed, and the main flow path 11 is disconnected from the first branch path 31, and the high-pressure fluid output by the pumping device 1 reaches the water jet cutter head 2 through the main flow path 11 and is ejected. When the pumping device 1 is stopped, the switch unit is opened, and the main flow path 11 is connected to the first branch path 31, and the high-pressure fluid remaining in the main flow path 11 is at least partially discharged from the pressure relief port 310 through the first branch path 31, thereby achieving the purpose of rapid pressure relief.
[0055] Specifically, the switch unit includes a first connecting rod 312 disposed in the first branch 31, and a first piston 311 connected to the first connecting rod 312 and close to one end of the main flow path 11. When the pumping device 1 is started, the first connecting rod 312 drives the first piston 311 to move downward to the connection port 110 between the main flow path 11 and the first branch 31 under the action of the external force applied synchronously with the start of the pumping device 1, thereby disconnecting the main flow path 11 from the first branch 31.
[0056] When the pumping device 1 stops, the external force applied to the first connecting rod 312 is removed synchronously with the shutdown of the pumping device 1, and the first piston 311 is moved away from the connecting port 110 under the drive of the reset mechanism described later, so that the main flow path 11 is connected with the first branch path 31, so that the high-pressure fluid in the main flow path 11 can enter the first branch path 31.
[0057] It can be understood that when the water jet system is in working condition, as the pumping device 1 is started, an external force is synchronously applied to the first connecting rod 312, pressing the first piston 311 to the connecting port 110 from top to bottom through the first connecting rod 312 and keeping the first branch 31 blocked. During this process, the external force needs to overcome the upward reverse pressure of the high-pressure fluid in the main flow 11 on the first piston 311, so that the external force needs to maintain a large value, which is easy to increase energy consumption.
[0058] To this end, as a preferred embodiment, the pressure relief device 3 further comprises a second branch 32 connected to the main flow path 11. As an example, Figure 1 As shown, the second branch 32 is located at the downstream side, i.e., the rear side, of the first branch 31. However, in actual applications, the second branch 32 may also be located at the upstream side of the first branch 31. The specific position is not limited. Preferably, the second branch 32 is arranged perpendicularly relative to the main flow path 11 as shown in the figure. In fact, the extension direction of the second branch 32 relative to the main flow path 11 is not limited thereto.
[0059] The switch unit further includes a balancing link 33 connected to the first link 312, and a second link 322 connected to the balancing link 33 and disposed in the second branch 32. The balancing link 33 extends substantially along the direction of the main flow 11, i.e., front and rear, and is mounted on the link support 34. Figure 1 As shown, the first connecting rod 312, the balancing connecting rod 33, and the second connecting rod 322 form a seesaw structure. Among them, the end of the second connecting rod 322 away from the balancing connecting rod 33 is connected to the second piston 321.
[0060] During operation, the high-pressure fluid in the main flow path 11 can enter the second branch path 32 and act on the second piston 321, and then apply a downward force to the first connecting rod 312 through the second connecting rod 322 and the balancing connecting rod 33, so as to offset the upward pressure applied to the first piston 311 by the high-pressure fluid at the connecting port 110. As a result, the external force applied to the first connecting rod 312 synchronously with the start-up of the pumping device 1 does not need to overcome the entire pressure applied to the first piston 311 by the high-pressure fluid, that is, the external force does not need to be too large, which increases the operational convenience and reduces energy consumption.
[0061] In addition, as a preferred method, in order to further speed up the pressure relief speed, the area of the connection port 110 between the main channel 11 and the first branch channel 31 is smaller than the maximum cross-sectional area of the first branch channel 31. In other words, the first branch channel 31 is thicker than the connection port 110, so that when the first piston 311 moves upward from the connection port 110, the high-pressure fluid in the main channel 11 can enter the first branch channel 31 more quickly.
[0062] Further preferably, the lower side of the first branch 31 and the lower side of the first piston 311 are configured in a conical style as shown in the figure, and the area of the lowermost end surface of the first piston 311 is the smallest, so as to further increase the speed at which the high-pressure fluid in the main flow 11 enters the first branch 31.
[0063] Also for the purpose of improving the residual energy release efficiency, the minimum cross-sectional area of the first branch 31 is not less than 5 times the cross-sectional area of the nozzle of the water jet cutter head 2. That is, when the first connecting rod 312 is in a non-sealed state, the minimum cross-sectional area of the channel between the main flow path 11 and the pressure relief port 310 is not less than 5 times the cross-sectional area of the nozzle of the water jet cutter head 2. In this way, when the pumping device 1 is shut down, most of the high-pressure fluid in the main flow path 11 will be discharged from the pressure relief port 310 through the first branch 31, thereby accelerating the pressure relief speed and reducing damage to tissues.
[0064] Embodiment 1
[0065] In one embodiment, the pressure relief device 3 of the present application is provided with a closing drive unit 30. As the pumping device 1 is started, the closing drive unit 30 moves downward synchronously and presses the first connecting rod 312. Then, the first connecting rod 312 pushes the first piston 311 to move to the connecting port 110 under the action of the external force synchronously applied by the closing drive unit 30. In this embodiment, the external force synchronously applied to the first connecting rod 312 as the pumping device 1 is the force that presses the first connecting rod 312 when the closing drive unit 30 moves downward.
[0066] In actual applications, for handheld instruments, the closing drive unit 30 can be a button set on the operating handle. For automatically controlled instruments, the closing drive unit 30 can be an electromagnet that starts and stops synchronously with the pumping device 1, or other devices that can generate displacement through electrical signals. No specific limitation is made here.
[0067] In addition, in actual operation, the closing drive unit 30 can be pressed first to move the first piston 311 down to the connecting port 110, and then the pumping device 1 can be started. As long as the high-pressure fluid in the main flow path 11 cannot enter the first branch path 31 after the pumping device 1 is started, the external force applied to the first connecting rod 312 by the closing drive unit 30 is synchronized with the start and stop of the pumping device 1 in this application is only a preferred method.
[0068] Further preferably, the pressure relief device 3 of the present application further comprises a reset mechanism; when the pumping device 1 switches from the start state to the stop state, the reset mechanism drives the switch unit to switch to the open state. Figure 1 The reset mechanism is an elastic member 35 connected to the side of the balancing link 33 close to the first link 312 .
[0069] When the pumping device 1 is started, as the first connecting rod 312 moves downward, the elastic member 35 is deformed and stored under the drive of the balancing connecting rod 33; when the pumping device 1 is stopped, the elastic member 35 rebounds and drives the first piston 311 to move away from the connecting port 110 via the balancing connecting rod 33 and the first connecting rod 312, so that the main channel 11 is connected to the first branch channel 31. It can be understood that the elastic member 35 can also be directly connected to the first connecting rod 312, for example, it is sleeved on the first connecting rod 312, as long as it can drive the first connecting rod 312 and the first piston 311 to move upward when the pumping device 1 is stopped. In addition, the elastic member 35 can be located below the balancing connecting rod 33 as shown in the figure, and the elastic member 35 is compressed when the balancing connecting rod 33 is pressed downward to the front side, or it can be connected above the balancing connecting rod 33, and the elastic member 35 is stretched when the balancing connecting rod 33 is pressed downward to the front side, which is not specifically limited here.
[0070] Continue to view Figure 1 In this embodiment, the first link 312 is rotatably hinged to the balancing link 33 via the first rotating shaft 3121, the link support 34 is movably connected to the first longitudinal balancing groove 331 extending forward and backward in the middle of the balancing link 33 via the supporting rotating shaft 341, and the second link 322 is movably connected to the second longitudinal balancing groove 332 extending forward and backward at the rear side of the balancing link 33 via the second rotating shaft 3221. Therefore, the balancing link 33 can rotate and move forward and backward relative to the supporting rotating shaft 341, and the balancing link 33 can rotate and move forward and backward relative to the second rotating shaft 3221.
[0071] As a preferred mode, a longitudinal balancing groove extending forward and backward may be provided on the front side of the balancing link 33, which is used to be movably connected with the first rotating shaft 3121 of the first connecting rod 312, so that the balancing link 33 can both rotate and move forward and backward relative to the first rotating shaft 3121. Furthermore, the first balancing groove 331 in the middle of the balancing link 33 may be eliminated, so that the balancing link 33 can only rotate relative to the supporting rotating shaft 341 but cannot move forward and backward relatively, and the supporting rotating shaft 341 is connected to the front and rear middle position of the balancing link 33, so that the vertical distances of the first connecting rod 312 and the second connecting rod 322 relative to the front and rear direction of the connecting rod support 34 are equal.
[0072] At the same time, the areas of the lower end faces of the first piston 311 and the second piston 321 are set to be equal, so that the pressures applied by the high-pressure fluid in the main flow path 11 to the first piston 311 and the second piston 321 are equal. After multiplying these two pressures by the vertical distances of the first connecting rod 312 and the second connecting rod 322 relative to the connecting rod support 34, it can be obtained that the pressures applied by the high-pressure fluid in the main flow path 11 to the first piston 311 and the second piston 321 are equal to the moments M1 and M2 of the connecting rod support 34, respectively.
[0073] In this way, the pressure applied to the first piston 311 by the high-pressure fluid in the main flow path 11 is offset by the pressure applied to the second piston 321 by the high-pressure fluid. As a result, the external force required to press the closing drive unit 30 to keep the first piston 311 at the connecting port 110 only needs a relatively low value to press the first piston 311 at the connecting port 110, thereby greatly reducing the difficulty of the pressing operation.
[0074] It is understandable that the equality of M1 and M2 mentioned here is only an ideal situation. In actual applications, due to friction and other reasons, there will be a certain difference between M1 and M2. The difference between the two can be within a predetermined threshold range. The predetermined threshold range referred to here and below refers to the range in which the difference between the moments M1 and M2 is not enough to overcome the friction and cause the balance link 33 to move.
[0075] Embodiment 2
[0076] Next, combine Figure 2 The second embodiment of the pressure relief device 3 of the present application is described. Figure 2 Schematic diagram of a water jet system and a pressure relief device 3 of Embodiment 2. The same parts as those in Embodiment 1 will not be described again, and only the different parts will be described.
[0077] See also Figure 2 In the second embodiment, the connecting rod support member 34 is configured to be able to move forward and backward between a first position close to the first connecting rod 312 and a second position close to the second connecting rod 322, as shown by the double-headed arrows in the figure, and the support shaft 341 can synchronously move forward and backward in the first balancing groove 331 in the middle of the balancing connecting rod 33. The forward and backward movement of the connecting rod support member 34 can be achieved by electric control, which will not be described in detail.
[0078] Assume that the pressure exerted by the high-pressure fluid in the main flow path 11 on the first piston 311 relative to the connecting rod support 34 has a torque M1, and the pressure exerted by the high-pressure fluid in the main flow path 11 on the second piston 321 relative to the connecting rod support 34 has a torque M2.
[0079] Preferably, the lower end surface of the first piston 311 is set equal to the lower end surface of the second piston 321. However, in actual applications, the areas of the lower end surfaces of the two pistons may not be equal. For the convenience of description, the areas of the two pistons are set equal here.
[0080] When the pumping device 1 is started, the connecting rod support 34 is located at the forward first position. The vertical distance of the first connecting rod 312 in the front-rear direction relative to the connecting rod support 34 is less than the vertical distance of the second connecting rod 322 in the front-rear direction relative to the connecting rod support 34, such that M1 < M2 and the difference between the two exceeds a pre-specified threshold range. Thus, under the action of the moment difference between M1 and M2, the first connecting rod 312 drives the first piston 311 to move downward to the connection port 110, disconnecting the main flow path 11 from the first branch 31.
[0081] In this embodiment, the external force synchronously applied to the first connecting rod 312 as the pumping device 1 is started is the force applied to the first connecting rod 312 via the seesaw structure of the balance connecting rod 33 by the pressure of the high-pressure fluid in the main flow path 11 on the second piston 321.
[0082] When the pumping device 1 is stopped, the connecting rod support 34 synchronously moves to the rear second position. The vertical distance of the first connecting rod 312 in the front-rear direction relative to the connecting rod support 34 is greater than the vertical distance of the second connecting rod 322 in the front-rear direction relative to the connecting rod support 34, such that M1 > M2 and the difference between the two exceeds a pre-specified threshold range. Thus, under the action of the moment difference between M1 and M2, the first connecting rod 312 drives the first piston 311 to move upward, connecting the main flow path 11 to the first branch 31. The high-pressure fluid in the main flow path 11 enters the first branch 31 through the connection port 110, thereby quickly relieving pressure.
[0083] Compared with the first embodiment, this embodiment does not require an additional closing drive unit 30. Only relying on the seesaw structure composed of the first connecting rod 312, the balance connecting rod 33, and the second connecting rod 322, through the forward and backward movement of the connecting rod support 34, relying on the moment difference of the pressure of the high-pressure fluid in the main flow path 11 on the first piston 311 and the second piston 321 relative to the connecting rod support 34, the first connecting rod 312 and the first piston 311 are synchronously moved downward or upward with the start and stop of the pumping device 1, thereby realizing the synchronous disconnection and connection between the main flow path 11 and the first branch 31.
[0084] In summary, the pressure relief device 3 of the water jet system of the present application, by providing a first branch 31 communicating with the main flow path 11 and a switch unit that is synchronously closed / opened with the start / stop of the pumping device 1, disconnects the first branch 31 from the main flow path 11 when the water jet system is operating, and connects the first branch 31 to the main flow path 11 when the water jet system stops operating, so that at least part of the high-pressure fluid in the main flow path 11 can be discharged through the first branch 31. Compared with the prior art solution of only discharging from the nozzle of the water jet head 2, the method of the present application greatly speeds up the release rate of the residual energy and reduces unnecessary damage to the tissue. It has been experimentally verified that in an instrument using a high-pressure water jet as an energy source, the pressure relief device of the present application can reduce the pressure relief time from 1 - 3 seconds to the millisecond level.
[0085] 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 pressure relief device for a water jet system, the water jet system comprising a water jet head, a pumping device, and a main flow path connecting the water jet head and the pumping device; characterized in that: The pressure relief device comprises a first branch connected to the main flow path and a switch unit; the switch unit is used to control the connection / disconnection between the main flow path and the first branch path; When the pumping device is started, in response to the start-up of the pumping device, the switch unit is closed, thereby disconnecting the main flow path from the first branch flow, and the fluid output by the pumping device reaches the water jet cutter head through the main flow path and is ejected; When the pumping device stops, in response to the pumping device stopping, the switch unit opens, so that the main flow path is connected to the first branch path, and the fluid in the main flow path is at least partially discharged through the first branch path.
2. The pressure relief device of the water jet system according to claim 1, characterized in that: including a reset mechanism; When the pumping device switches from the start state to the stop state, the reset mechanism drives the switch unit to switch to the open state.
3. The pressure relief device of the water jet system according to claim 2, characterized in that: The switch unit comprises a first connecting rod disposed on the first branch, and a first piston connected to the first connecting rod; When the pumping device is started, the first connecting rod drives the first piston to move to the connection between the main channel and the first branch channel under the action of the external force applied synchronously with the start of the pumping device, so as to disconnect the main channel from the first branch channel; When the pumping device stops, the external force applied to the first connecting rod is removed synchronously with the stopping of the pumping device, and the first piston is moved away from the connection between the main channel and the first branch under the drive of the reset mechanism, and the main channel is connected to the first branch.
4. The pressure relief device of the water jet system according to claim 3, characterized in that: comprising a second branch path in communication with the main path; The switch unit comprises a balancing link connected to the first link, and a second link connected to the balancing link and arranged in the second branch; The balancing connecting rod extends substantially along the direction of the main flow path and is mounted on the connecting rod support member; Wherein, one end of the second connecting rod away from the balancing connecting rod is connected to a second piston.
5. The pressure relief device of the water jet system according to claim 4, characterized in that: The reset mechanism is an elastic member connected to the balancing link or the first link; When the pumping device is started, the reset mechanism deforms and accumulates force as the first connecting rod moves; When the pumping device stops, the reset mechanism rebounds and drives the first piston to move away from the connection between the main channel and the first branch channel via the first connecting rod, and the main channel is connected to the first branch channel.
6. The pressure relief device of the water jet system according to claim 5, characterized in that: comprising a closing drive unit; As the pumping device is started, the first connecting rod pushes the first piston to move to the connection between the main channel and the first branch channel under the action of the external force synchronously applied by the closing drive unit.
7. The pressure relief device of the water jet system according to claim 6, characterized in that: Assume that the pressure exerted by the fluid in the main flow path on the first piston relative to the torque of the connecting rod support is M1, and the pressure exerted by the fluid in the main flow path on the second piston relative to the torque of the connecting rod support is M2, then the difference between M1 and M2 is within a predetermined threshold range.
8. The pressure relief device of the water jet system according to claim 4, characterized in that: The link support is reciprocatable between a first position close to the first link and a second position close to the second link; Let the moment of the pressure of the fluid in the main flow path acting on the first piston with respect to the link support be M1, and the moment of the pressure of the fluid in the main flow path acting on the second piston with respect to the link support be M2; When the pumping device is started, the link support is located at the first position, M1 < M2 and the difference between the two exceeds a pre-specified threshold range. Thus, under the action of the moment difference between M1 and M2, the first link drives the first piston to move towards the main flow path, disconnecting the main flow path from the first branch; When the pumping device is shut down, the link support is moved to the second position, M1 > M2 and the difference between the two exceeds the threshold range. Thus, under the action of the moment difference between M1 and M2, the first link drives the first piston to move away from the main flow path, connecting the main flow path to the first branch.
9. The pressure relief device of the water jet system according to claim 1, characterized in that: The minimum cross-sectional area of the first branch is not less than 5 times the cross-sectional area of the nozzle of the water jet cutter head.
10. The pressure relief device of the water jet system according to claim 1, characterized in that: The area of the connection between the main flow path and the first branch is smaller than the maximum cross-sectional area of the first branch.
11. A water jet system comprising a pumping device, a water jet head, and a main flow path connecting the pumping device and the water jet head; characterized in that: A pressure relief device for the water jet system according to any one of claims 1-10.