Pressure relief device of water jet scalpel system and water jet scalpel system

Abstract

The utility model provides a pressure relief device of a water jet scalpel system. The water jet scalpel system comprises a water jet scalpel head, a pumping device and a main flow path connected with the water jet scalpel head and the pumping device. The pressure relief device comprises a first branch communicated with the main flow path and a switch unit; the switch unit is used for controlling the connection / disconnection of the main flow path and the first branch; when the pumping device is started, the switch unit is closed, then the main flow path and the first branch path are disconnected, and fluid output by the pumping device reaches the water jet cutter head through the main flow path and is sprayed out. When the pumping device is shut down, the switch unit is turned on, then the main flow path is communicated with the first branch, and at least part of fluid in the main flow path is discharged through the first branch. Accordingly, the release efficiency of the residual energy can be improved.

Description

Technical Field

[0001] The utility model 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 jet instruments, the fluid is pressurized by a booster pumping device and then 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 pump stops running, the residual energy in the high-pressure pipe will continue to be released through the nozzle of the water jet head due to factors such as the expansion of the pipe wall. During this pressure release process, although the operator has stopped the instrument, the residual energy can 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 existing technology, how to improve the release efficiency of residual energy and thus reduce unnecessary damage to tissues has become a technical issue. Utility Model Content

[0006] The present invention aims to provide a pressure relief device for a water jet system capable of improving the efficiency of residual energy release. To achieve the above-mentioned object, one embodiment of the present invention is a pressure relief device for a water jet system, wherein the water jet system comprises a water jet cutter head, a pumping device, and a main flow path connecting the water jet cutter head and the pumping device; the pressure relief device comprises a first branch connected to the main flow path and a switch unit; the switch unit is configured to control the connection / disconnection between the main flow path and the first branch path; when the pumping device is activated, the switch unit is closed in response to the activation of the pumping device, thereby disconnecting the main flow path from the first branch path, 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 is deactivated, the switch unit is opened in response to the deactivation of the pumping device, thereby connecting the main flow path to the first branch path, and at least partially discharging the fluid in the main flow path through the first branch path.

[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 shutdown 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, the second link is connected to a second piston at one end away from the balancing link.

[0010] In a preferred embodiment, 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 link 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 link, 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 channel and the first branch channel under the action of the external force synchronously applied by the closing drive unit.

[0012] In a preferred embodiment, 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 torque of the fluid in the main flow path acting on the first piston with respect to the connecting rod support be M1, and the torque of the fluid in the main flow path acting 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 them exceeds a pre-defined threshold range. Thus, under the action of the torque 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 them exceeds the threshold range. Thus, under the action of the torque 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 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 utility model is 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; and the 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 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. By simultaneously providing a second branch, the reverse pressure of part 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 utility model more clearly, the accompanying drawings of the present utility model will be described and explained below. Obviously, the accompanying drawings in the following description only illustrate certain aspects of some exemplary embodiments of the present utility model. 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 the water jet system and the pressure relief device of Embodiment 1.

[0020] Figure 2Schematic diagram of the water jet system and the pressure relief device of the second embodiment.

[0021] Caption of the accompanying drawings:

[0022] 1 Pumping device

[0023] 11 Main Road

[0024] 110 connector

[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 Shaft

[0034] 32 Second Branch Road

[0035] 321 Second Piston

[0036] 322 Second connecting rod

[0037] 3221 Second Rotating Shaft

[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 invention are described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present invention to those skilled in the art. It should be noted that unless otherwise stated, the relative arrangement of components and steps, numerical expressions, numerical values, etc. described in these embodiments should be interpreted as merely exemplary and not as limiting.

[0045] The words “include” or “comprises” and similar words used in the present invention mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0046] All terms (including technical or scientific terms) used in this utility model have the same meaning as those understood by ordinary technicians in the field to which this utility model 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 they have in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless otherwise explicitly defined herein.

[0047] Components, parameters such as specific models of components, relationships between components, and control circuits that are not described in detail in this section may be considered to be technologies, methods, and equipment known to ordinary technicians in the relevant fields, but where appropriate, 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 invention 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 cutting head 2, which are connected via a main flow path 11. During surgery, when the water jet system is required to operate, the pumping device 1 is activated. The pressurized fluid generated by the pumping device generates a very high pressure in the high-pressure pipe of the main flow path 11 and is ejected from the nozzle of the water jet cutting head 2 to form an operating jet 21. The kinetic energy and cavitation effect of the operating jet 21 are used to perform debridement, ablation, and cutting operations.

[0051] For the sake of convenience, the present invention 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 and the downstream side is the rear. Figure 1The direction perpendicular to the front and back in the viewing angle is the up and down direction, wherein the position of the water jet head 2 in the figure is closer to the main flow path 11 as the down direction and farther away from the main flow path 11 as the up direction.

[0052] When the pumping device 1 stops, the residual energy in the main flow path 11 does not stop being discharged immediately due to factors such as the expansion of the high-pressure pipe wall. Instead, it continues to be released through the nozzle of the water jet head 2. This pressure release process typically takes 1 to 3 seconds. For devices with operating pressures exceeding 70 MPa or long high-pressure pipes, the pressure release time may be longer. During this pressure release time, although the external device has stopped operating, the residual energy in the main flow path 11 may still cause unnecessary damage to tissues.

[0053] For this purpose, see Figure 1 The present invention 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 arranged perpendicular to the main flow path 11 as shown in the figure, but the direction in which the first branch 31 extends relative to the main flow path 11 is not limited to this.

[0054] When the pumping device 1 is started, the switch unit is closed, disconnecting the main channel 11 from the first branch channel 31. The high-pressure fluid output by the pumping device 1 reaches the water jet cutter head 2 through the main channel 11 and is ejected. When the pumping device 1 is stopped, the switch unit is opened, connecting the main channel 11 to the first branch channel 31. At least part of the high-pressure fluid remaining in the main channel 11 is discharged from the pressure relief port 310 through the first branch channel 31, thereby achieving rapid pressure relief.

[0055] Specifically, the switch unit includes a first connecting rod 312 disposed within the first branch channel 31, and a first piston 311 connected to the first connecting rod 312 at one end near the main channel 11. When the pumping device 1 is activated, the first connecting rod 312, under the action of an external force applied synchronously with the activation of the pumping device 1, drives the first piston 311 downward to the connection port 110 between the main channel 11 and the first branch channel 31, thereby disconnecting the main channel 11 from the first branch channel 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 11 is connected to the first branch 31, allowing the high-pressure fluid in the main flow 11 to enter the first branch 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 from top to bottom through the first connecting rod 312 to the connecting port 110 and maintaining the blockage of the first branch 31. 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 be maintained at a large value, which easily increases energy consumption.

[0058] Therefore, 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 downstream, i.e., rearward, of the first branch 31. However, in practical applications, the second branch 32 may also be located upstream of the first branch 31. The specific location is not limited. Preferably, the second branch 32 is disposed perpendicularly relative to the main channel 11 as shown in the figure. In practice, the direction in which the second branch 32 extends relative to the main channel 11 is not limited to this.

[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 to back, and is mounted on a 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, wherein 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, which is used to offset the upward pressure applied to the first piston 311 by the high-pressure fluid at the connecting port 110. Therefore, 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 convenience of operation and reduces energy consumption.

[0061] Furthermore, as a preferred method, to further accelerate pressure relief, 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 larger than the diameter of the connection port 110. This allows the high-pressure fluid in the main channel 11 to enter the first branch channel 31 more quickly after the first piston 311 moves upward from the connection port 110.

[0062] Further preferably, the lower side of the first branch 31 and the lower side of the first piston 311 are set to 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] To improve the efficiency of residual energy release, the minimum cross-sectional area of ​​the first branch channel 31 is no less than five times the cross-sectional area of ​​the nozzle of the water jet head 2. Specifically, when the first connecting rod 312 is in an unsealed state, the minimum cross-sectional area of ​​the passage between the main channel 11 and the pressure relief port 310 is no less than five times the cross-sectional area of ​​the nozzle of the water jet head 2. Consequently, when the pumping device 1 is shut down, the majority of the high-pressure fluid in the main channel 11 is discharged from the pressure relief port 310 via the first branch channel 31, thereby accelerating pressure relief and minimizing tissue damage.

[0064] Example 1

[0065] In one embodiment, the pressure relief device 3 of the present invention is provided with a closing drive unit 30. As the pumping device 1 is activated, the closing drive unit 30 moves downward synchronously and presses the first connecting rod 312. Subsequently, under the action of the external force simultaneously applied by the closing drive unit 30, the first connecting rod 312 pushes the first piston 311 to move to the connecting port 110. In this embodiment, the external force simultaneously applied to the first connecting rod 312 as the pumping device 1 is activated 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 limitations are given here.

[0067] In addition, in actual operation, the closing drive part 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 it is ensured that the high-pressure fluid in the main flow path 11 cannot enter the first branch 31 after the pumping device 1 is started, the external force applied to the first connecting rod 312 by the closing drive part 30 is synchronized with the start and stop of the pumping device 1 in the present invention is only a preferred method.

[0068] Further preferably, the pressure relief device 3 of the present invention 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 deforms and accumulates force under the drive of the balancing connecting rod 33; when the pumping device 1 is shut down, the elastic member 35 rebounds and drives the first piston 311 away from the connecting port 110 via the balancing connecting rod 33 and the first connecting rod 312, thereby connecting the main channel 11 with the first branch channel 31. It is 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 shut down. 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 forward. It can also be connected above the balancing connecting rod 33, and the elastic member 35 is stretched when the balancing connecting rod 33 is pressed forward. No specific limitation is given here.

[0070] Continue to read Figure 1 In this embodiment, the first link 312 is rotatably hinged to the balancing link 33 via a first rotation axis 3121. The link support 34 is movably connected to a first, longitudinally extending balancing slot 331 in the middle of the balancing link 33 via a support rotation axis 341. The second link 322 is movably connected to a second, longitudinally extending balancing slot 332 at the rear of the balancing link 33 via a second rotation axis 3221. Thus, the balancing link 33 can both rotate and move forward and backward relative to the support rotation axis 341, and can both rotate and move forward and backward relative to the second rotation axis 3221.

[0071] As a preferred embodiment, a longitudinal balancing groove extending forward and backward can be provided on the front side of the balancing link 33 for movable connection with the first rotating shaft 3121 of the first connecting rod 312, allowing the balancing link 33 to 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 can be eliminated, allowing the balancing link 33 to rotate only relative to the supporting rotating shaft 341 but not to move forward and backward relative to the supporting rotating shaft 341. The supporting rotating shaft 341 can be connected to the front-to-back midpoint of the balancing link 33, ensuring that the vertical distances of the first connecting rod 312 and the second connecting rod 322 relative to the connecting rod support member 34 are equal.

[0072] At the same time, the areas of the lower end surfaces 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 relative to the connecting rod support 34.

[0073] In this way, the pressure exerted on the first piston 311 by the high-pressure fluid in the main flow path 11 is offset by the pressure exerted on the second piston 321 by the high-pressure fluid. Therefore, 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, which greatly reduces the difficulty of the pressing operation.

[0074] It should be understood that the equality of M1 and M2 mentioned here is only an ideal situation. In actual applications, due to factors such as friction, there will be a certain difference between M1 and M2. As long as the difference is within a predetermined threshold range, it is sufficient. The predetermined threshold range referred to here and below refers to the range within which the difference between the moments M1 and M2 is insufficient to overcome friction and cause the balancing link 33 to move.

[0075] Example 2

[0076] Next, combine Figure 2 The second embodiment of the pressure relief device 3 of the present invention is described. Figure 2 Schematic diagram of the water jet system and the pressure relief device 3 of Example 2. The same parts as those in Example 1 will not be repeated, and only the differences will be described.

[0077] See Figure 2 In the second embodiment, the link support member 34 is configured to be movable back and forth between a first position proximate to the first link 312 and a second position proximate to the second link 322, as indicated by the double-headed arrows in the figure. The support shaft 341 is also capable of synchronously moving back and forth within the first balancing slot 331 in the center of the balancing link 33. The forward and backward movement of the link support member 34 can be achieved by electronic control, which will not be elaborated in detail.

[0078] Assume that the torque of the pressure exerted by the high-pressure fluid in the main channel 11 on the first piston 311 relative to the connecting rod support 34 is M1, and the torque of the pressure exerted by the high-pressure fluid in the main channel 11 on the second piston 321 relative to the connecting rod support 34 is M2.

[0079] Preferably, the areas of the lower end surfaces of the first piston 311 and the second piston 321 are equal. However, in actual applications, the areas of the lower end surfaces of the two pistons may not be equal. For the sake of convenience, the areas of the two pistons are equal.

[0080] When the pumping device 1 starts, the connecting rod support 34 is in the frontmost first position. The vertical distance of the first connecting rod 312 in the front-back direction relative to the connecting rod support 34 is less than the vertical distance of the second connecting rod 322 in the front-back direction relative to the connecting rod support 34, so that M1 < M2 and the difference between the two exceeds the pre-specified threshold range. Thus, under the action of the torque 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 starts 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 stops, the connecting rod support 34 synchronously moves to the second position at the rear. The vertical distance of the first connecting rod 312 in the front-back direction relative to the connecting rod support 34 is greater than the vertical distance of the second connecting rod 322 in the front-back direction relative to the connecting rod support 34, so that M1 > M2 and the difference between the two exceeds the pre-specified threshold range. Thus, under the action of the torque 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 torque 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 synchronously move downward or upward as the pumping device 1 starts and stops, thereby synchronously disconnecting and connecting 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 invention, by providing a first branch 31 connected to the main flow path 11 and a switch unit that opens and closes synchronously 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 is stopped. This allows at least a portion of the high-pressure fluid in the main flow path 11 to be discharged through the first branch 31. Compared to the prior art solution that discharges the fluid only from the nozzle of the water jet head 2, the present invention significantly accelerates the release of residual energy and reduces unnecessary damage to tissue. Experimental verification has shown that in devices using high-pressure water jets as an energy source, the pressure relief device of the present invention can reduce the pressure relief time from 1-3 seconds to milliseconds.

[0085] It should be understood that the specific embodiments described above are only used to explain the present invention, and the scope of protection of the present invention is not limited thereto. Any technical personnel familiar with the technical field, within the technical scope disclosed by the present invention, shall make changes, substitutions, and combinations based on the technical solution and inventive concept of the present invention, which shall be covered by the scope of protection of the present invention.

Claims

1. A pressure relief device for a water jet system, the water jet system comprising a water jet cutter head, a pumping device, and a main flow path connecting the water jet cutter head and the pumping device; characterized in that: The pressure relief device includes 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 path from the first branch path, and the fluid output by the pumping device reaches the water jet cutter head through the main path and is ejected; When the pumping device stops, in response to the pumping device stopping, the switch unit opens, thereby connecting the main path to the first branch path, and the fluid in the main 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: Contains 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 includes a first connecting rod provided 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, thereby disconnecting 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 shutdown 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 includes 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 link extends substantially along the direction of the main flow path and is mounted on the link 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, so that 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 portion; 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 simultaneously applied by the closing drive unit.

7. The pressure relief device of the water jet system according to claim 6, wherein: If the torque of the fluid in the main flow path acting on the first piston with respect to the link support is M1, and the torque of the fluid in the main flow path acting on the second piston with respect to the link support is M2, then the difference between M1 and M2 is within a pre-specified threshold range.

8. The pressure relief device of the water jet system according to claim 4, wherein: The link support can reciprocate between a first position close to the first link and a second position close to the second link; If the torque of the fluid in the main flow path acting on the first piston with respect to the link support is M1, and the torque of the fluid in the main flow path acting on the second piston with respect to the link support is M2; When the pumping device is started, the link support is located at the first position, M1 < M2 and the difference between them exceeds the pre-specified threshold range. Thus, under the action of the torque difference between M1 and M2, the first link moves the first piston towards the direction close to the main flow path, disconnecting the main flow path from the first branch; When the pumping device is stopped, the link support is moved to the second position, M1 > M2 and the difference between them exceeds the threshold range. Thus, under the action of the torque difference between M1 and M2, the first link drives the first piston towards the direction 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, wherein: 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, wherein: 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.

11. 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; wherein: It comprises the pressure relief device of the water jet system according to any one of claims 1 - 10.

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