A passageway purging device and purging system

Abstract

The application provides a channel internal purging device and a purging system, and relates to the technical field of cleaning of an aero-engine. The channel internal purging device comprises a purging pipe and a protective cover. The purging pipe has opposite proximal and distal ends, and the distal end of the purging pipe is provided with a purging hole. The purging hole is used for spraying the purging medium in the purging pipe outward, so as to purge and clean the excess material in the channel. The protective cover comprises protective supports and protective parts arranged between adjacent protective supports. The protective cover is used for switching between an open state and a recovery state under the action of the purging medium. When the protective cover is in the recovery state, the protective supports are close to the outer wall of the purging pipe. When the protective cover is in the open state, the other end of the protective supports is used for being directed towards the inner wall of the channel, so that the protective parts block the movement of the purging medium towards the distal end of the purging pipe, and thus the problem that the excess material carried in the purging medium continues to penetrate into the channel is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine cleaning, in particular to a channel internal purging device and a purging system. BACKGROUND

[0002] An aero-engine is a system engineering containing tens of thousands of parts and extremely complex. With the increasing demand for engine performance and the increasing function, its structure is more and more complex, and the production, processing, assembly and other processes involved are more and more complicated. Excess material may be generated and carried in each link. Among the many factors affecting the quality of the aero-engine, the excess material is often a major hidden danger causing quality accidents, which has a great influence on the performance, safety, reliability and life of the engine. In severe cases, it may even cause engine accidents. For example, excess material in the flow passage will cause engine blade damage, affecting aerodynamic performance and even causing airframe rupture and leading to in-flight shutdown. Excess material in the pipeline may cause pipeline blockage, gas and liquid supply interruption, and even system pressure overload, causing pipeline or accessory explosion. Excess material in the oil system not only blocks the pipeline and prevents normal oil supply, but also causes serious wear of engine accessories, even causing major failures such as shaft seizure and engine burnout. Therefore, the control and cleaning of excess material are extremely important.

[0003] The methods commonly used for excess material cleaning include wiping - wiping the surface and accessible parts of the product with a cloth; blowing - blowing away the excess material inside the pipeline with compressed air; sucking - using a magnet to remove surface-attached iron filings; washing - cleaning with special solvents and effective methods such as ultrasonic cleaning; and vibrating - placing the open part of the product below and knocking the product with a rubber mallet to remove excess material by vibration. However, for the cleaning of excess material attached to the inner wall of the pipe / cavity which needs to be avoided from further deepening, especially small particle excess material attached to the inner wall of the pipe / cavity through viscous oil, the above methods cannot solve the problem. Direct blowing will cause the excess material to continue to deepen into the cavity, and the vibration method has little effect on the excess material attached to the pipe wall. However, this situation is very common and the cost of disassembly and cleaning is high, so it is urgent to find a suitable cleaning method. SUMMARY

[0004] The purpose of the present application is to provide a channel internal purging device which can improve the problem of causing excess material to continue to deepen into the cavity or pipe (collectively referred to as the channel) during purging.

[0005] The purpose of the present application is also to provide a purging system which can improve the problem of causing excess material to continue to deepen into the cavity or pipe during purging.

[0006] The embodiments of the present application can be implemented in the following way:

[0007] A channel purging device comprises a purging pipe having opposite proximal and distal ends, the distal end of the purging pipe being provided with a purging hole for spraying a purging medium in the purging pipe outwardly; and

[0008] A protective cover comprising a plurality of protective supports and a protective portion arranged between two adjacent protective supports; one end of the protective support is hinged to the outer wall of the purging pipe, and the hinged position of the protective support to the purging pipe is farther away from the proximal end than the purging hole; the protective cover is used to switch between an open state and a recovery state under the action of the purging medium; when the protective cover is in the recovery state, the protective support is close to the outer wall of the purging pipe, and when the protective cover is in the open state, the other end of the protective support is used to face the inner wall of the channel, so as to block the movement of the purging medium to the distal end of the purging pipe by the protective portion.

[0009] Optionally, the channel purging device further comprises a driving member comprising a piston portion and an elastic support arm connected to each other; the piston portion is arranged in the purging pipe and is used to slide relative to the purging pipe under the pressure of the purging medium; the purging pipe has a through hole for the elastic support arm to move; the elastic support arm is used to extend from the through hole and support the protective support to rotate from the recovery state to the open state, or is used to retract the purging pipe from the through hole, so as to switch the protective support from the open state to the recovery state.

[0010] Optionally, the elastic support arm comprises a first arm portion and a second arm portion, one end of the first arm portion is fixedly connected to the piston portion, and the first arm portion extends along the axis of the purging pipe; the second arm portion is connected to the other end of the first arm portion, and the second arm portion is inclined relative to the first arm portion; the through hole is inclined relative to the radial direction of the purging pipe.

[0011] Optionally, one end of the second arm portion away from the first arm portion has a clamping groove for clamping and limiting the protective support.

[0012] Optionally, the piston portion is used to block the purging hole to close the purging hole when the protective cover is in the recovery state; the piston portion is also used to be arranged out of position with the purging hole to open the purging hole when the protective cover is in the open state.

[0013] Optionally, the distal end of the purging pipe has an end wall, and the channel purging device further comprises an elastic member arranged between the piston portion and the end wall, the elastic member being used to apply an elastic force to the piston portion towards the proximal end.

[0014] Optionally, one of the end wall and the piston part is provided with a boss, and one end of the elastic member is sleeved on the boss; the other of the end wall and the piston part is provided with a groove, and the other end of the elastic member is accommodated in the groove.

[0015] Optionally, a plurality of the blow holes are distributed along the circumference of the blow pipe, the axial direction of the blow holes is inclined to the direction of the radial of the blow pipe close to the proximal end of the blow pipe, and the projection of the axial direction of the blow holes on the cross section of the blow pipe is inclined to the radial of the blow pipe, so that the jet flow of the blow medium is spiral.

[0016] Optionally, the protection part is made of elastic material.

[0017] A blow system, comprising a power device and the channel blow device, the power device is communicated with the blow pipe of the channel blow device, so that the power device forms a blow medium flow in the blow pipe.

[0018] The channel blow device and the blow system provided by the embodiments of the present application have the following beneficial effects:

[0019] The channel blow device provided by the embodiments of the present application comprises a blow pipe and a protection cover. The blow pipe has opposite proximal and distal ends, and the distal end of the blow pipe is provided with a blow hole for jetting the blow medium in the blow pipe outward, so as to blow and clean the excess matter in the channel (i.e. in the pipe or in the cavity). The protection cover comprises protection supports and a protection part arranged between the adjacent protection supports. One end of the protection support is hinged outside the blow pipe, and the hinge position of the protection support and the blow pipe is away from the proximal end of the blow pipe. The protection cover is used to switch between the open state and the recovery state under the action of the blow medium. When the protection cover is in the recovery state, the protection support is close to the outer wall of the blow pipe. When the protection cover is in the open state, the other end of the protection support is used to face the inner wall of the channel, so as to block the movement of the blow medium to the distal end of the blow pipe by the protection part, thereby avoiding the problem that the excess matter carried in the blow medium continues to penetrate into the channel.

[0020] The embodiments of the present application also provide a blow system, which comprises the above-mentioned channel blow device, and thus also has the problem that the movement of the blow medium to the distal end of the blow pipe is blocked, thereby avoiding the problem that the excess matter carried in the blow medium continues to penetrate into the channel. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above features and advantages of the present application can be better understood by reading the detailed description of embodiments of the present application in conjunction with the following drawings, in which: in the drawings, the components are not necessarily drawn to scale, and the components having similar related properties or features can have the same or similar reference numerals.

[0022] Figure 1 Fig. 1 shows a schematic diagram of the overall structure of a channel purging device according to an aspect of the present application;

[0023] Figure 2 Fig. 2 shows a schematic diagram of the structure of the channel purging device according to an aspect of the present application when the protective cover is in an open state;

[0024] Figure 3 Fig. 3 shows a schematic diagram of the cross-sectional structure of the channel purging device according to an aspect of the present application when in operation;

[0025] Figure 4 Fig. 4 shows a schematic diagram of the cross-sectional structure of the channel purging device according to an aspect of the present application when the protective cover is in a retracted state;

[0026] Figure 5 Fig. 5 shows a schematic diagram of the structure of the driving member of the channel purging device according to an aspect of the present application;

[0027] Figure 6 Fig. 6 shows a schematic diagram of the cross-sectional structure of the channel purging device according to an aspect of the present application at A-A; Figure 3

[0028] Reference signs:

[0029] 100 - channel purging device; 110 - purging tube; 111 - proximal end; 112 - distal end; 113 - purging hole; 114 - end wall; 115 - boss; 116 - side wall; 117 - through hole; 120 - protective cover; 121 - protective support; 122 - protective portion; 130 - driving member; 131 - piston portion; 132 - groove; 133 - elastic support arm; 134 - first arm portion; 135 - second arm portion; 136 - clamping groove; 140 - elastic member; 200 - channel; 210 - excess material. DETAILED DESCRIPTION

[0030] The present application will be described in detail below with reference to the drawings and specific embodiments. Note that the aspects described below in conjunction with the drawings and specific embodiments are merely exemplary and should not be understood as limiting the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer", "vertical" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the present application is normally placed, and are not indicative or suggestive of the device or element having a specific orientation or being constructed and operated in a specific orientation, and therefore should not be understood as limiting the present application.

[0032] ​It should be noted that the terms "first", "second" and the like in the description are used only for distinguishing between similar objects, and do not indicate or imply a relative importance between the objects.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified or limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixedly connected, can be integrally connected, or can be detachably connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or the communication between the internal elements of two elements, etc. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Figure 1 The overall structure schematic diagram of the channel internal purging device 100 provided in the embodiment is shown in FIG. 1, and Figure 1 The protective cover 120 in the channel internal purging device 100 provided in the embodiment is in the recovery state, Figure 2 The structure schematic diagram of the channel internal purging device 100 provided in the embodiment when the protective cover 120 is in the open state is shown in FIG. 2, Figure 3 The cross-sectional structure schematic diagram of the channel internal purging device 100 when working is shown in FIG. 3. Please refer to Figures 1-3 The present embodiment provides a channel internal purging device 100, and accordingly, a purging system (not shown in the figure) is also provided.

[0035] The purging system includes the channel internal purging device 100, and the purging system also includes a power device (not shown in the figure), which is in communication with the purging pipe 110 of the channel internal purging device 100, so as to form a purging medium flow in the purging pipe 110 by the power device. Optionally, in the present embodiment, the purging medium flow is a purging gas flow, and accordingly, the power device can be selected to be a gas pump. It can be understood that the purging medium can also be other substances, such as a purging liquid.

[0036] Please continue to refer to Figures 1-3The channel internal blowing device 100 provided by the embodiment comprises a blowing pipe 110 and a protective cover 120. The blowing pipe 110 has opposite proximal end 111 and distal end 112, and the distal end 112 of the blowing pipe 110 is provided with a blowing hole 113 for spraying the blowing medium in the blowing pipe 110 outward, so as to blow and clean the excess 210 in the channel 200 (i.e. in the pipe or in the cavity). The protective cover 120 comprises protective supports 121 and protective parts 122 arranged between adjacent protective supports 121. One end of the protective support 121 is hinged outside the blowing pipe 110, and the hinged position of the protective support 121 and the blowing pipe 110 is away from the proximal end 111 of the blowing pipe 110. The protective cover 120 is used to switch between the open state and the recovery state under the action of the blowing medium. When the protective cover 120 is in the recovery state, the protective support 121 is close to the outer wall of the blowing pipe 110, and when the protective cover 120 is in the open state, the other end of the protective support 121 is used to face the inner wall of the channel 200, so as to block the movement of the blowing medium to the distal end 112 of the blowing pipe 110 through the protective part 122, thereby avoiding the problem that the excess 210 carried by the blowing medium continues to penetrate into the channel 200.

[0037] It should be noted that in the description of the embodiment, "distal end 112" and "proximal end 111" are two relative parts. The "proximal end 111" is the end of the blowing pipe 110 close to the power device along the axial direction of the blowing pipe 110 (i.e. the length direction of the blowing pipe 110), or the end of the blowing pipe 110 close to the outlet of the channel 200. Correspondingly, the "distal end 112" is the end of the blowing pipe 110 away from the power device along the axial direction of the blowing pipe 110 (i.e. the length direction of the blowing pipe 110), or the end of the blowing pipe 110 close to the inside of the channel 200. At the same time, in the description of the embodiment, the "proximal end 111" and the "distal end 112" are parts within a certain length range including the end of the blowing pipe 110. The certain length range can be 5% of the length of the blowing pipe 110.

[0038] Figure 4 The cross-sectional structure schematic diagram of the protective cover 120 in the recovery state in the channel 200 internal blowing device provided by the embodiment is shown. Please refer to Figures 1-4 In the embodiment, a plurality of protective supports 121 are uniformly distributed along the circumference of the protective cover 120, and the protective part 122 is arranged between two adjacent protective supports 121. One end of the protective support 121 is hinged to the outer wall of the blowing pipe 110, and the other end of the protective support 121 is a free end. By rotating the protective support 121 around the hinged position of the blowing pipe 110, the protective cover 120 can be switched between the open position (as shown in Figure 2 and Figure 3 ) and the recovery position (as shown in Figure 1 and Figure 4The protection cover 120 is in the retracted state when the plurality of protection supports 121 are rotated to be close to the outer wall of the purge pipe 110, i.e. the protection supports 121 are substantially parallel to the axis of the purge pipe 110. The protection cover 120 is in the open state when the plurality of protection supports 121 are rotated to be close to the inner wall of the passage 200, i.e. the protection supports 121 are substantially along the radial direction of the purge pipe 110. At this time, the protection cover 120 as a whole is in the shape of an open umbrella. Since the hinge position of the protection support 121 is away from the proximal end 111 compared with the purge hole 113, the protection cover 120 blocks the side closer to the inside of the passage 200 compared with the purge hole 113, preventing the purge gas flow blown out of the purge hole 113 from carrying the excess material 210 into the passage 200.

[0039] Optionally, the number of protection supports 121 is at least six, which not only ensures effective support for the protection cover 120, but also forms a protection cover 120 with a more circular outer contour when open, ensuring that it fits the circular contour of the passage 200, thereby ensuring the shielding effect. Specifically, in this embodiment, the number of protection supports 121 is six, and the six protection supports 121 are uniformly distributed along the circumference of the purge pipe 110. It can be understood that in some other embodiments, the number of protection supports 121 can also be set according to requirements.

[0040] Further, the free end of the protection support 121 is in an arc-shaped structure, which is curved towards the proximal end 111 of the purge pipe 110 when the protection cover 120 is in the open state, thereby increasing the fitting area of the protection cover 120 with the passage 200 and the protection effect.

[0041] Optionally, in this embodiment, the protection part 122 is made of elastic material, so that when the protection cover 120 switches to the open state, the protection part 122 is stretched and the area is expanded. It can be understood that in some other embodiments, the protection part 122 can also be made of a material without elasticity, for example, a structure similar to an umbrella surface can be used as the protection cover 120.

[0042] Figure 5 The structure schematic diagram of the driving member 130 of the passage internal purging device 100 provided in this embodiment is shown in FIG. 6. Please refer to Figures 1-5In the embodiment, the channel purging device 100 further comprises a driving member 130, which is configured to switch the protective cover 120 from the recovery state to the open state under the action of the gas pressure of the purging gas. Specifically, the driving member 130 comprises a piston portion 131 and an elastic support arm 133 connected with each other. The piston portion 131 is arranged in the purging pipe 110 and is configured to slide relative to the purging pipe 110 under the action of the gas pressure of the purging gas. The purging pipe 110 is provided with a through hole 117 through which the elastic support arm 133 is configured to extend and support the protective bracket 121 to rotate from the recovery state to the open state, or to retract into the purging pipe 110, so that the protective bracket 121 can be switched from the open state to the recovery state.

[0043] Optionally, the elastic support arm 133 comprises a first arm portion 134 and a second arm portion 135. One end of the first arm portion 134 is fixedly connected with the piston portion 131, and the first arm portion 134 extends along the axis of the purging pipe 110. The second arm portion 135 is connected with the other end of the first arm portion 134, and the second arm portion 135 is inclined relative to the first arm portion 134, so that the second arm portion 135 can extend out of the through hole 117 to the outside of the purging hole 113. Correspondingly, the through hole 117 is inclined relative to the radial direction of the purging pipe 110, so as to ensure that the second arm portion 135 can smoothly extend out of the through hole 117 when the piston portion 131 moves along the radial direction of the purging pipe 110.

[0044] Specifically, the piston portion 131 is a cylindrical block, which is adapted to the inner diameter of the purging hole 113 and is in sliding fit with the purging hole 113. The first arm portion 134 and the second arm portion 135 are both strips. The first arm portion 134 is arranged parallel to the axis of the piston portion 131, and one end of the first arm portion 134 is fixedly connected with the piston portion 131. The other end of the first arm portion 134 is fixedly connected with the second arm portion 135, and the second arm portion 135 extends towards the radial direction of the piston portion 131, so that the first arm portion 134 is inclined relative to the second arm portion 135. The first arm portion 134 and the second arm portion 135 form the elastic support arm 133, that is, the included angle between the first arm portion 134 and the second arm portion 135 can be changed under the action of an external force.

[0045] Optionally, the number of the elastic support arms 133 is adaptively set to be multiple according to the number of the protective brackets 121, that is, one-to-one correspondence between the multiple elastic support arms 133 and the multiple protective brackets 121. In the embodiment, the number of the elastic support arms 133 is six. The six elastic support arms 133 are uniformly distributed along the circumference of the piston portion 131.

[0046] In the embodiment, when the driving member 130 is in the state shown in FIG. 2, the protective cover 120 is in the open state, and the protective cover 120 is supported by the elastic support arms 133. Figure 4When the piston portion 131 is moved from the position shown in Fig. 2 to the position shown in Fig. 3 relative to the purge pipe 110 towards the distal end 112 of the purge pipe 110, the second arm portion 135 gradually approaches the through hole 117 as the piston portion 131 moves, and when the upper end of the second arm portion 135 reaches the through hole 117, the restriction of the side wall 116 of the purge pipe 110 on the second arm portion 135 disappears, the second arm portion 135 gradually resets under the action of its own elastic force, the included angle between the first arm portion 134 and the second arm portion 135 decreases, and the second arm portion 135 extends out of the through hole 117. Thus, the protective bracket 121 is rotated relative to the purge pipe 110 by the second arm portion 135 to open the protective cover 120. Figure 4 When the piston portion 131 is moved from the position shown in Fig. 2 to the position shown in Fig. 3 relative to the purge pipe 110 towards the distal end 112 of the purge pipe 110, the second arm portion 135 gradually approaches the through hole 117 as the piston portion 131 moves, and when the upper end of the second arm portion 135 reaches the through hole 117, the restriction of the side wall 116 of the purge pipe 110 on the second arm portion 135 disappears, the second arm portion 135 gradually resets under the action of its own elastic force, the included angle between the first arm portion 134 and the second arm portion 135 decreases, and the second arm portion 135 extends out of the through hole 117. Thus, the protective bracket 121 is rotated relative to the purge pipe 110 by the second arm portion 135 to open the protective cover 120. Figure 3 When the piston portion 131 is moved from the position shown in Fig. 2 to the position shown in Fig. 3 relative to the purge pipe 110 towards the distal end 112 of the purge pipe 110, the second arm portion 135 gradually approaches the through hole 117 as the piston portion 131 moves, and when the upper end of the second arm portion 135 reaches the through hole 117, the restriction of the side wall 116 of the purge pipe 110 on the second arm portion 135 disappears, the second arm portion 135 gradually resets under the action of its own elastic force, the included angle between the first arm portion 134 and the second arm portion 135 decreases, and the second arm portion 135 extends out of the through hole 117. Thus, the protective bracket 121 is rotated relative to the purge pipe 110 by the second arm portion 135 to open the protective cover 120.

[0047] Further, the end of the second arm portion 135 away from the first arm portion 134 has a clamping groove 136 for clamping the protective bracket 121, to ensure the reliability of the support of the second arm portion 135 on the protective bracket 121. Specifically, the groove type of the clamping groove 136 is adapted to the shape of the protective bracket 121.

[0048] In this embodiment, the channel internal purging device 100 further comprises an elastic member 140 for pushing the driving member 130 to reset in the case of a decrease in the gas pressure in the purge pipe 110, so as to switch the protective cover 120 from the open state to the recovery state. Specifically, the distal end 112 of the purge pipe 110 has an end wall 114, so that the purge pipe 110 forms a structure with the distal end 112 closed. Therefore, in this embodiment, the "direction close to the distal end 112" is the direction close to the end wall 114, and correspondingly, the "direction close to the proximal end 111" is the direction away from the end wall 114. The elastic member 140 is arranged between the piston portion 131 and the end wall 114. When the piston portion 131 is moved to the position shown in Fig. 2 under the action of the gas pressure in the purge pipe 110, the elastic member 140 is compressed. When the gas pressure in the purge pipe 110 is lower than the elastic force of the elastic member 140, the piston portion 131 slides relative to the purge pipe 110 towards the proximal end 111 of the purge pipe 110 under the action of the elastic restoring force of the elastic member 140, and in this process, the protective cover 120 switches to the recovery state. Figure 3

[0049] Optionally, the elastic member 140 is a spring. It can be understood that in other embodiments, other structures can be provided to reset the driving member 130 and the protective cover 120, for example, a torsion spring is arranged at the hinge between the protective bracket 121 and the purge pipe 110.

[0050] ​Optionally, the end wall 114 is provided with a boss 115 extending towards the piston portion 131, one end of the elastic member 140 is sleeved on the boss 115 and fixedly connected with the end wall 114, so as to fix and limit one end of the elastic member 140, so as to ensure the stability of the deformation direction of the elastic member 140. The piston portion 131 is provided with a groove 132, and the other end of the elastic member 140 is accommodated in the groove 132 and fixedly connected with the piston portion 131, so as to fix and limit the other end of the elastic member 140. It can be understood that in other embodiments, the boss 115 can also be arranged on the piston portion 131, and the groove 132 can be arranged on the end wall 114. Specifically, the groove 132 is located at the center position of the piston portion 131, and a plurality of elastic supporting arms 133 are distributed around the groove 132.

[0051] As shown in Figure 4 , in this embodiment, the piston portion 131 is also used to shield the blowhole 113 when the protective cover 120 is in the recovery state, so that the blowhole 113 is closed to prevent the blowout medium in the blowout pipe 110 from leaking; as shown in Figure 3 , the piston portion 131 is also used to be arranged in a staggered manner with the blowhole 113 when the protective cover 120 is in the open state, specifically, at this time, the blowout portion is away from the proximal end 111 compared with the blowhole 113, so as to open the blowhole 113, and the blowout medium in the blowout pipe 110 is sprayed out from the blowhole 113, so as to blow and clean the excess 210 in the channel 200. Since the opening and closing of the blowhole 113 and the state switching of the protective cover 120 are controlled by the movement of the driving member 130, it is effectively ensured that the open or recovery moment of the protective cover 120 matches the blowout moment, avoiding the problem of delayed shielding.

[0052] Moreover, when the piston portion 131 moves towards the direction close to the distal end 112 relative to the blowout pipe 110 under the action of air pressure, the elastic force of the elastic member 140 needs to be overcome, therefore, by setting the pre-tightening force of the elastic member 140, the blowout intensity of the blowout medium can be controlled to ensure the blowout effect.

[0053] Figure 6 For Figure 3 the cross-sectional structure schematic view of A-A in the middle, Figure 3 , Figure 4 and Figure 6 , the arrow direction is the movement direction of the blowout medium. Please refer to Figure 3 and Figure 6In the embodiment, a plurality of blow holes 113 are distributed along the circumference of the blow pipe 110, the axial direction of the blow holes 113 is inclined to the radial direction of the blow pipe 110 towards the proximal end 111 of the blow pipe 110, and the projection of the axial direction of the blow holes 113 on the cross section of the blow pipe 110 is inclined to the radial direction of the blow pipe 110, so that the jet flow of the blowing medium is spiral. Figure 6 In the embodiment, the cross section of the blow pipe 110 is the plane cut by the cross section of the blow pipe 110 perpendicular to the axis L of the blow pipe 110, and the projection of the axial direction of the blow holes 113 on the cross section of the blow pipe 110 is the direction of the jet flow of the blowing medium when the jet flow of the blowing medium blows out of the blow holes 113.

[0054] Specifically, the angle of the axial direction of the blow holes 113 inclined to the radial direction of the blow pipe 110 towards the proximal end 111 of the blow pipe 110 is θ in the embodiment, and the angle of the projection of the axial direction of the blow holes 113 on the cross section of the blow pipe 110 inclined to the radial direction of the blow pipe 110 is β in the embodiment. Figure 3 Figure 6 Optionally, in the embodiment, θ = 30°. It can be understood that in other embodiments, the angles of θ and β can also be specifically set according to requirements.

[0055] By setting the opening direction of the blow holes 113, the jet flow of the blowing medium blowing out of the blow holes 113 is spiral and countercurrent, where “countercurrent” refers to the direction away from the distal end 112, in other words, the direction close to the proximal end 111. Therefore, the tangential blowing action force of the jet flow of the blowing medium on the excess material 210 attached to the inner wall of the channel 200 greatly improves the cleaning effect, and at the same time, the spiral flow in the channel 200 reduces the flow loss and improves the blowing range along the channel.

[0056] In use, the distal end 112 of the blow pipe 110 is inserted into the channel 200 until the distal end 112 of the blow pipe 110 is located in the part of the channel 200 to be blown, and then the jet flow of the blowing medium is generated by the power device, and the gas pressure of the jet flow of the blowing medium acts on the piston part 131. When the gas pressure is greater than the pre-tightening force of the elastic member 140, the piston part 131 is pushed to be compressed, and the piston part 131 is pushed to the direction of the end wall 114 of the blow pipe 110 along the axial direction of the blow pipe 110 (i.e. the direction away from the distal end 112 of the blow pipe 110). Figure 4 ​The elastic support arm 133 moves accordingly as the purge pipe 110 moves upwards. When the end of the elastic support arm 133 reaches the position of the through hole 117, the limiting effect of the side wall 116 of the purge pipe 110 on the elastic support arm 133 disappears, the elastic support arm 133 extends out of the through hole 117, and the protective bracket 121 is engaged in the engaging groove 136. As the elastic support arm 133 extends out of the through hole 117, the protective bracket 121 rotates relative to the purge pipe 110, and the protective part 122 is opened, thereby forming an umbrella shape, such as... Figure 2 and Figure 3 As shown, the protective cover 120 switches to the open state, and at the same time, the piston part 131 moves to the side of the purge hole 113. At this time, the purge hole 113 opens, and the purge airflow in the purge pipe 110 is ejected from the purge hole 113, as shown in the figure. Figure 3 and Figure 6 The spiral-shaped jet is sprayed into the channel 200 to clean up the excess material 210 inside the channel 200. The excess material 210 leaves the channel 200 from the end near the proximal end 111 of the purge pipe 110. Due to the shielding effect of the protective cover 120 and the orientation of the purge hole 113, the excess material 210 is effectively prevented from penetrating deeper into the channel 200.

[0057] After purging is completed, the power unit is turned off, the pressure of the purging airflow in the purging pipe 110 decreases, and the elastic element 140 pushes the piston part 131 along the axial direction of the purging pipe 110 in a direction away from the end wall 114 of the purging pipe 110 (i.e., Figure 3 The elastic support arm 133 retracts into the purge pipe 110 and undergoes elastic deformation due to the limitation of the purge pipe 110. The protective cover 120 switches to the retraction state. At the same time, with the movement of the piston part 131, the purge hole 113 is blocked, and the purge operation is completed.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A channel purging device, characterized in that, The channel purging device includes: A purge tube having a proximal end and a distal end, the distal end of which is provided with a purge orifice for ejecting purge medium from the purge tube outward; and A protective cover includes multiple protective supports and a protective portion disposed between two adjacent protective supports; one end of each protective support is hinged to the outer wall of the purge pipe, and the hinge position of the protective support to the purge pipe is farther from the proximal end of the purge hole; the protective cover is used to switch between an open state and a retracted state under the action of the purge medium; when the protective cover is in the retracted state, the protective support is close to the outer wall of the purge pipe; when the protective cover is in the open state, the other end of the protective support is directed toward the inner wall of the channel to block the purge medium from moving toward the distal end of the purge pipe through the protective portion.

2. The channel purging device according to claim 1, characterized in that: The channel purging device further includes a driving component, which includes a piston and an elastic support arm connected to each other. The piston is disposed inside the purging tube and is used to slide relative to the purging tube under the pressure of the purging medium. The purging tube has a through hole for the elastic support arm to move. The elastic support arm is used to extend out of the through hole and support the protective bracket to rotate from the retracted state to the open state, or to retract the purging tube from the through hole so that the protective bracket switches from the open state to the retracted state.

3. The channel purging device according to claim 2, characterized in that: The elastic support arm includes a first arm and a second arm. One end of the first arm is fixedly connected to the piston. The first arm extends along the axis of the purge tube. The second arm is connected to the other end of the first arm, and the second arm is inclined relative to the first arm; the through hole is radially inclined relative to the purge tube.

4. The channel purging device according to claim 3, characterized in that: The second arm has a snap-fit ​​groove at the end away from the first arm, which is used to snap-fit ​​and limit the protective bracket.

5. The channel purging device according to claim 2, characterized in that: The piston portion is used to block the purge port when the protective cover is in the retracted state, so as to close the purge port; the piston portion is also used to be misaligned with the purge port when the protective cover is in the open state, so as to open the purge port.

6. The channel purging device according to claim 2, characterized in that: The distal end of the purge tube has an end wall, and the purge device in the channel further includes an elastic element disposed between the piston portion and the end wall, the elastic element being used to apply an elastic force to the piston portion pointing to the proximal end.

7. The channel purging device according to claim 6, characterized in that: A boss is provided on one of the end wall and the piston portion, and one end of the elastic member is sleeved on the boss; a groove is provided on the other of the end wall and the piston portion, and the other end of the elastic member is accommodated in the groove.

8. The channel purging device according to claim 1, characterized in that: A plurality of purge holes are distributed circumferentially along the purge pipe. The axial direction of the purge holes is inclined relative to the radial direction of the purge pipe towards the proximal end of the purge pipe, and the projection of the axial direction of the purge holes onto the cross-section of the purge pipe is inclined relative to the radial direction of the purge pipe, so that the ejected purge medium flow is spiral.

9. The channel purging device according to any one of claims 1-8, characterized in that: The protective part is made of elastic material.

10. A purging system, characterized in that: The purging system includes a power unit and a channel purging device as described in any one of claims 1-9, wherein the power unit is connected to the purging pipe of the channel purging device to form a purging medium flow in the purging pipe through the power unit.

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