Check valve for petroleum drilling and using method thereof
By designing the valve core mechanism and sealing components, the problem of easy wear of the arrow-shaped check valve under high pressure gas and liquid was solved, thereby improving safety and sealing in the drilling process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA NAT PETROLEUM CORP
- Filing Date
- 2024-11-21
- Publication Date
- 2026-05-22
AI Technical Summary
Existing arrow-shaped check valves are prone to excessive compression and wear between the valve core and valve seat under high-pressure gas and liquid action, resulting in poor sealing performance. They are also prone to wear under the impact of mud, posing a risk of blowout.
A check valve for oil drilling was designed, including a valve core mechanism and a sealing assembly. Through the cooperation of the feed port, buffer assembly and return spring, unidirectional flow is achieved and the position of the valve core is restricted, thereby reducing impact wear.
This effectively avoids collisions and wear between the valve core and the valve seat, improves sealing performance, reduces the risk of valve body wear, and ensures drilling safety.
Smart Images
Figure CN122071913A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of check valve technology for oil drilling, and specifically to a check valve for oil drilling and its usage method. Background Technology
[0002] During drilling operations on a drilling platform, the complex and variable formations often lead to encounters with high-pressure formation fluids. Without a reliable blowout prevention system, well kicks or blowouts can occur, affecting drilling safety and efficiency. A check valve is a valve with a circular valve disc that operates under pressure to prevent backflow of the medium. This type of valve allows the medium to flow in only one direction and prevents flow in the opposite direction. Typically, these valves operate automatically; they open under the pressure of fluid flowing in one direction. When fluid flows in the opposite direction, the fluid pressure and the valve disc act on the valve seat, thus cutting off the flow.
[0003] Among them, the arrow-shaped check valve is a blowout prevention tool inside the drill string. It is connected in the drill string and when it encounters a high-pressure oil and gas layer pushing upwards, it can drive the arrow-shaped valve core to move upwards and fit against the valve seat to seal, close the channel inside the drill string, and prevent blowouts and well kicks.
[0004] However, the existing arrow-shaped check valve structure has shortcomings in actual use: Under the action of high-pressure gas and liquid, the upward impact of the gas and liquid directly acts on the valve core, causing the valve core to tend to surge upward. This makes it easy for excessive compression to occur between the valve core and the valve seat, lacking good buffering performance. As a result, the valve body wears out quickly. When the valve seat becomes loose or the valve core wears severely, the valve body will fail directly, and even a blowout may occur. Under normal working conditions, the drilling mud delivered from the drill pipe will push the valve core downward, separating the valve core from the valve seat and allowing the mud to flow. During this process, the mud will impact and rub against the top of the valve core for a long time, which will easily cause wear on the upper surface of the valve core. When the mud injection stops, the valve core moves upward under the action of the spring and automatically seals and closes with the valve seat. During this period, there will also be collisions between the valve core and the valve seat. After long-term use, the valve core and valve seat will easily wear down, resulting in poor sealing performance. Summary of the Invention
[0005] This invention provides a check valve for oil drilling and its usage method, overcoming the shortcomings of the prior art and effectively solving the problem of easy collision and wear between the valve core and valve seat of existing check valves.
[0006] One of the technical solutions of the present invention is achieved through the following measures: a check valve for oil drilling, comprising a first valve body, a second valve body, and a valve core mechanism. The second valve body is detachably installed on the outer side of the lower end of the first valve body. An installation cavity is provided in the upper part of the second valve body, and a flow channel is provided in the lower part of the second valve body. The installation cavity communicates with the flow channel. The inner diameter of the upper part of the flow channel is larger than the inner diameter of the installation cavity. A valve core mechanism capable of unidirectional communication from top to bottom is provided in the second valve body. A sealing component capable of blocking and restricting the movement of the valve core mechanism is installed in the second valve body corresponding to the position of the installation cavity.
[0007] The following are further optimizations and / or improvements to the above-mentioned technical solution: Preferably, the valve core mechanism includes a movable tube, with several internally and externally penetrating guide ports evenly distributed along the circumference of the upper part of the movable tube. A sealing component is provided in the second valve housing at each guide port position. When the sealing component extends, it can seal the guide port, and when it is compressed, it can open the guide port. A guide cover is installed inside the movable tube. A discharge channel is provided on the lower outer side of the movable tube corresponding to each guide port position. The discharge channel is located in the flow channel.
[0008] Preferably, the guide cover has a hollow structure with a conical upper part, and the lower edge of the conical part of the guide cover is flush with the lower edge of the guide opening.
[0009] Preferably, it also includes a buffer assembly, which includes a buffer seat slidably disposed inside the movable tube. The buffer seat has a filling chamber with an opening facing downwards, and a second return spring is installed between the top of the buffer seat and the lower end of the guide cover.
[0010] Preferably, the outer wall of the buffer seat has several strip-shaped grooves, and the inner wall of the movable tube is equipped with several limiting strips that are slidably connected to the strip-shaped grooves.
[0011] Preferably, the sealing assembly includes a wedge-shaped sealing block, a fixed shaft, a cross plate, and a third return spring. A transmission groove is provided on the inner side of the second valve body corresponding to each feed port position. A fixed shaft is installed at the bottom of the transmission groove, and a cross plate is installed at the inner end of the fixed shaft. The wedge-shaped sealing block has a cross cavity with an outward opening. The cross plate can slide in the cross cavity. A third return spring is installed between the cross plate and the bottom of the cross cavity groove. The upper end face of the feed port is an inclined surface with a lower inner end and a higher outer end. The upper inner end of the wedge-shaped sealing block matches the feed port.
[0012] Preferably, a first return spring is installed between the upper end of the movable tube and the lower outer side of the first valve housing; or / and, a plurality of limiting slides are provided on the upper inner wall of the movable tube, an upper pipe is installed at the upper end of the first valve housing, an inlet chamber is opened inside the first valve housing, a guide tube communicating with the inlet chamber is installed at the bottom of the first valve housing, a plurality of limiting rods are installed on the outer wall of the guide tube, and the limiting rods are slidably fitted and connected with the limiting slides; or / and, the lower part of the flow channel of the second valve housing is a funnel-shaped guide cavity, the lower end of the flow channel is a discharge trough, and a lower pipe is installed at the lower end of the second valve housing.
[0013] The second technical solution of the present invention is achieved through the following measures: a method of use, implemented according to the following method, The first step is to install the first valve body at the bottom of the drill pipe through the upper pipe. The drilling mud that is delivered in is then transported through the upper pipe, the feed chamber and the guide pipe to the inside of the movable pipe to impact and squeeze the upper end face of the guide cover. The second step is that as the pressure inside the movable tube located on the upper side of the feed guide cover continues to increase, the drilling mud can push the wedge-shaped sealing block sleeved inside the movable tube while pushing the feed guide cover downward, so that the wedge-shaped sealing block moves towards the inside of the transmission groove. The third step is that when the wedge-shaped sealing block is pushed into the transmission slot, the wedge-shaped sealing block slides along the outer wall of the fixed shaft, and the cross cavity slides against the outer wall of the cross plate, compressing the third return spring until the wedge-shaped sealing block is completely retracted into the inner side of the transmission slot. Fourth step: When the wedge-shaped sealing block is fully retracted into the transmission groove, the guide cover can drive the entire movable tube to move down. At this time, the limit rod slides inside the limit slide, and the first reset spring is stretched until the guide port is connected to the space below the installation cavity. At this time, the drilling mud located on the upper side of the guide cover can be transported to the guide cavity through the guide port and discharged from the lower pipe through the guide cavity and the discharge chute. Fifth, when a well kick or blowout occurs downhole, the pressure inside the well increases, and the liquid inside the well will be ejected upwards in the direction of the downhole pressure. When the lower connecting pipe moves down to the high-pressure layer, the high-pressure gas and liquid in the formation enter the lower side of the movable pipe through the bottom of the lower connecting pipe, the discharge chute and the guide cavity. The high-pressure gas and liquid will enter the filling cavity in advance to push the buffer seat upwards. The limiting strip slides inside the strip groove. The upward movement of the buffer seat compresses the second reset spring, thereby buffering and offsetting part of the impact force, so that the impact force acting on the guide cover is weakened. At this time, the wedge-shaped sealing block is located inside the guide port, which can constrain and limit the movable pipe, so that the internal space of the movable pipe located on the upper and lower sides of the guide cover is in a state of isolation and sealing.
[0014] The present invention has a reasonable and compact structure and is easy to use. By setting a valve core mechanism and a sealing component, it can maintain the channel for unidirectional flow, and the sealing component can restrict the position of the valve core mechanism to prevent it from being displaced by impact, thereby reducing the problem of collision and wear of the valve core mechanism due to the impact of mud. Attached Figure Description
[0015] Appendix Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention.
[0016] Appendix Figure 2 For the appendix Figure 1 A cross-sectional structural diagram.
[0017] Appendix Figure 3 For the appendix Figure 2 An enlarged structural diagram of the first valve body.
[0018] Appendix Figure 4 For the appendix Figure 1 A three-dimensional structural diagram of the central valve core mechanism.
[0019] Appendix Figure 5 For the appendix Figure 2 A magnified structural diagram of point A in the middle.
[0020] Appendix Figure 6 For the appendix Figure 2 A magnified structural diagram at point B in the middle.
[0021] The codes in the attached diagram are as follows: 1. Upper connecting pipe; 2. Lower connecting pipe; 3. First valve body; 31. Feed chamber; 32. Guide tube; 33. Limiting rod; 4. Second valve body; 41. Guide cavity; 42. Discharge groove; 43. Transmission groove; 44. Mounting cavity; 5. Valve core mechanism; 51. Movable tube; 52. First return spring; 53. Limiting slide; 54. Guide port; 55. Guide cover; 56. Discharge channel; 57. Buffer assembly; 571. Strip groove; 572. Filling cavity; 573. Buffer seat; 574. Second return spring; 575. Limiting strip; 6. Sealing assembly; 61. Fixed shaft; 62. Cross plate; 63. Cross cavity; 64. Third return spring; 65. Wedge-shaped sealing block. Detailed Implementation
[0022] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.
[0023] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.
[0024] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1-6 As shown, the check valve for oil drilling includes a first valve body 3, a second valve body 4, and a valve core mechanism 5. The second valve body 4 is detachably installed on the outer side of the lower end of the first valve body 3. The upper part of the second valve body 4 is provided with an installation cavity 44, and the lower part of the second valve body 4 is provided with a flow channel. The installation cavity 44 communicates with the flow channel. The upper inner diameter of the flow channel is larger than the inner diameter of the installation cavity 44. The valve core mechanism 5, which can communicate unidirectionally from top to bottom, is provided inside the second valve body 4. A sealing component 6, which can block and restrict the movement of the valve core mechanism 5, is installed inside the second valve body 4 corresponding to the position of the installation cavity 44.
[0025] This invention, by setting a valve core mechanism and a sealing component, can maintain unidirectional flow in the channel, and the sealing component can restrict the position of the valve core mechanism to prevent it from being displaced by impact, thereby reducing the problem of collision and wear of the valve core mechanism due to the impact of mud.
[0026] The above-mentioned check valves for oil drilling can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figure 4 As shown, the valve core mechanism 5 includes a movable tube 51. Several internal and external through guide ports 54 are evenly distributed along the circumference of the upper part of the movable tube 51. A sealing component 6 is provided in the second valve shell 4 at each guide port 54 position. When the sealing component 6 is extended, it can seal the guide port 54, and when compressed, it can open the guide port 54. A guide cover 55 is installed in the movable tube 51. A discharge channel 56 is provided on the lower outer side of the movable tube 51 corresponding to each guide port 54 position. The discharge channel 56 is located in the flow channel.
[0027] Example 3: As shown in the attached document Figure 4 As shown, the guide cover 55 is a hollow structure with a conical upper part, and the lower edge of the conical part of the guide cover 55 is flush with the lower edge of the guide port 54. The conical structure can guide the drilling fluid to the sealing component 6 and reduce the impact of drilling fluid.
[0028] Example 4: As shown in the appendix Figure 4 , 6 As shown, it also includes a buffer assembly 57, which includes a buffer seat 573 slidably disposed inside the movable tube 51. The buffer seat 573 has a filling chamber 572 with its opening facing downward. A second return spring 574 is installed between the top of the buffer seat 573 and the lower end of the guide cover 55.
[0029] Example 5: As shown in the attached document Figure 4 , 6 As shown, the outer wall of the buffer seat 573 has several strip-shaped grooves 571, and the inner wall of the movable tube 51 is equipped with several limiting strips 575 that are slidably connected to the strip-shaped grooves 571. The limiting strips 575 and the strip-shaped grooves 571 restrict the movement path of the buffer seat 573 and prevent rotation.
[0030] Example 6: As shown in the appendix Figure 5As shown, the sealing assembly 6 includes a wedge-shaped sealing block 65, a fixed shaft 61, a cross plate 62, and a third return spring 64. A transmission groove 43 is provided inside the second valve body 4 corresponding to each feed port 54 position. The fixed shaft 61 is installed at the bottom of the transmission groove 43, and the cross plate 62 is installed at the inner end of the fixed shaft 61. The wedge-shaped sealing block 65 has an outward-opening cross cavity 63, and the cross plate 62 can slide within the cross cavity 63. A third return spring 64 is installed between the cross plate 62 and the bottom of the cross cavity 63. The upper surface of the feed port 54 is an inclined surface with a lower inner end and a higher outer end. The upper inner end of the wedge-shaped sealing block 65 matches the feed port 54. By setting the sealing assembly 6, the valve core mechanism 5 is prevented from moving, and the seal between the inclined surface of the feed port 54 and the wedge-shaped sealing block 65 significantly improves the sealing performance of the valve body.
[0031] Example 7: As attached Figure 2 , 4 As shown, a first return spring 52 is installed between the upper end of the movable tube 51 and the lower outer side of the first valve housing 3. When the drilling fluid injection stops, the pressure disappears, and the first return spring 52 pulls the movable tube 51 upward to reset. When the feed inlet 54 is aligned with the wedge-shaped sealing block 65, the third return spring 64 pushes the wedge-shaped sealing block 65 inward to move it inside the feed inlet 54, thus re-restricting the position of the movable tube 51.
[0032] Example 8: As attached Figure 3 , 4 As shown, the upper inner wall of the movable tube 51 is provided with several limiting slides 53, the upper end of the first valve shell 3 is equipped with an upper pipe 1, the inside of the first valve shell 3 is provided with an inlet chamber 31, the bottom of the first valve shell 3 is equipped with a guide tube 32 that communicates with the inlet chamber 31, and several limiting rods 33 are installed on the outer wall of the guide tube 32. The limiting rods 33 are slidably fitted and connected with the limiting slides 53.
[0033] Example 9: As attached Figure 2 As shown, the lower part of the flow channel of the second valve housing 4 is a funnel-shaped guide cavity 41, and the lower end of the flow channel is a discharge trough 42. A lower connecting pipe 2 is installed at the lower end of the second valve housing 4. The funnel-shaped guide cavity 41 can buffer drilling fluid and reduce wear.
[0034] Example 10: As attached Figure 1-6 As shown, the usage method is as follows. The first step is to install the first valve body 3 at the bottom of the drill pipe through the upper pipe 1. The drilling mud is then transported through the upper pipe 1, the feed chamber 31 and the guide pipe 32 to the inside of the movable pipe 51 to impact and squeeze the upper surface of the guide cover 55. The second step is that as the pressure inside the movable tube 51 located on the upper side of the feed guide cover 55 continues to increase, the drilling mud can push the wedge-shaped sealing block 65 sleeved inside the movable tube 51 while pushing the feed guide cover 55 down, so that the wedge-shaped sealing block 65 is pushed into the transmission groove 43. Third step, when the wedge-shaped sealing block 65 is pushed into the transmission slot 43, the wedge-shaped sealing block 65 slides along the outer wall of the fixed shaft 61, and the cross cavity 63 slides against the outer wall of the cross plate 62, compressing the third return spring 64 until the wedge-shaped sealing block 65 is completely retracted into the inner side of the transmission slot 43. Fourth step, when the wedge-shaped sealing block 65 is fully retracted into the transmission groove 43, the guide cover 55 can drive the entire movable tube 51 to move downward. At this time, the limit rod 33 slides inside the limit slide 53, and the first reset spring 52 is stretched until the guide port 54 is connected to the lower space of the installation cavity 44. At this time, the drilling mud located on the upper side of the guide cover 55 can be transported to the guide cavity 41 through the guide port 54, and discharged from the lower pipe 2 through the guide cavity 41 and the discharge chute 42. Fifth step: When a well kick or blowout occurs downhole, the pressure inside the well increases, and the liquid inside the well will be ejected upwards in the direction of the downhole pressure. When the lower pipe 2 moves down to the high-pressure layer, the high-pressure gas and liquid in the formation enter the lower side of the movable pipe 51 through the bottom of the lower pipe 2, the discharge chute 42 and the guide cavity 41. The high-pressure gas and liquid will enter the filling cavity 572 in advance to push the buffer seat 573 upwards. The limiting strip 575 slides inside the strip groove 571. The buffer seat 573 moves upwards to compress the second reset spring 574, thereby buffering and offsetting part of the impact force, so that the impact force acting on the guide cover 55 is weakened. At this time, the wedge-shaped sealing block 65 is located inside the guide port 54, which can constrain and limit the movable pipe 51, so that the internal space of the movable pipe 51 located above and below the guide cover 55 is in a state of isolation and sealing.
[0035] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
Claims
1. A check valve for oil drilling, characterized in that... The device includes a first valve housing, a second valve housing, and a valve core mechanism. The second valve housing is detachably installed on the outer side of the lower end of the first valve housing. The upper part of the second valve housing has an installation cavity, and the lower part of the second valve housing has a flow channel. The installation cavity is connected to the flow channel. The upper inner diameter of the flow channel is larger than the inner diameter of the installation cavity. The second valve housing has a valve core mechanism that can communicate unidirectionally from top to bottom. A sealing component that can block and restrict the movement of the valve core mechanism is installed in the second valve housing corresponding to the position of the installation cavity.
2. The check valve for oil drilling according to claim 1, characterized in that... The valve core mechanism includes a movable tube with several internally and externally penetrating guide ports evenly distributed along the circumference of the upper part of the movable tube. Each guide port is equipped with a sealing component in the second valve housing. When the sealing component extends, it can seal the guide port, and when it is compressed, it can open the guide port. A guide cover is installed inside the movable tube. A discharge channel is provided on the lower outer side of the movable tube corresponding to each guide port. The discharge channel is located in the flow channel.
3. The check valve for oil drilling according to claim 2, characterized in that... The guide cover has a hollow structure with a cone shape at the top, and the lower edge of the cone-shaped part of the guide cover is flush with the lower edge of the guide opening.
4. The check valve for oil drilling according to claim 2 or 3, characterized in that... It also includes a buffer assembly, which includes a buffer seat that is slidably disposed inside the movable tube. The buffer seat has a filling chamber with an opening facing downwards, and a second return spring is installed between the top of the buffer seat and the lower end of the guide cover.
5. The check valve for oil drilling according to claim 4, characterized in that... The outer wall of the buffer seat has several strip-shaped grooves, and the inner wall of the movable tube is equipped with several limiting strips that are slidably connected to the strip-shaped grooves.
6. The check valve for oil drilling according to claim 2, 3, or 5, characterized in that... The sealing assembly includes a wedge-shaped sealing block, a fixed shaft, a cross plate, and a third return spring. The inner side of the second valve housing corresponding to each feed port position is provided with a transmission groove. The fixed shaft is installed at the bottom of the transmission groove, and the cross plate is installed at the inner end of the fixed shaft. The wedge-shaped sealing block has a cross cavity with an outward opening. The cross plate can slide in the cross cavity. The third return spring is installed between the cross plate and the bottom of the cross cavity groove. The upper end face of the feed port is an inclined surface with the inner end lower and the outer end higher. The upper side of the inner end of the wedge-shaped sealing block matches the feed port.
7. The check valve for oil drilling according to claim 4, characterized in that... The sealing assembly includes a wedge-shaped sealing block, a fixed shaft, a cross plate, and a third return spring. The inner side of the second valve housing corresponding to each feed port position is provided with a transmission groove. The fixed shaft is installed at the bottom of the transmission groove, and the cross plate is installed at the inner end of the fixed shaft. The wedge-shaped sealing block has a cross cavity with an outward opening. The cross plate can slide in the cross cavity. The third return spring is installed between the cross plate and the bottom of the cross cavity groove. The upper end face of the feed port is an inclined surface with the inner end lower and the outer end higher. The upper side of the inner end of the wedge-shaped sealing block matches the feed port.
8. The check valve for oil drilling according to claim 2, 3, 5, or 7, characterized in that... A first return spring is installed between the upper end of the movable tube and the lower outer side of the first valve body; or / and, the upper inner wall of the movable tube is provided with several limiting slides, the upper end of the first valve body is provided with an upper pipe, the inside of the first valve body is provided with an inlet chamber, the bottom of the first valve body is provided with a guide tube connected to the inlet chamber, the outer wall of the guide tube is provided with several limiting rods, and the limiting rods are slidably fitted and connected to the limiting slides; or / and, the lower part of the flow channel of the second valve body is a funnel-shaped guide cavity, the lower end of the flow channel is a discharge trough, and the lower end of the second valve body is provided with a lower pipe.
9. The check valve for oil drilling according to claim 6, characterized in that... A first return spring is installed between the upper end of the movable tube and the lower outer side of the first valve body; or / and, the upper inner wall of the movable tube is provided with several limiting slides, the upper end of the first valve body is provided with an upper pipe, the inside of the first valve body is provided with an inlet chamber, the bottom of the first valve body is provided with a guide tube connected to the inlet chamber, the outer wall of the guide tube is provided with several limiting rods, and the limiting rods are slidably fitted and connected to the limiting slides; or / and, the lower part of the flow channel of the second valve body is a funnel-shaped guide cavity, the lower end of the flow channel is a discharge trough, and the lower end of the second valve body is provided with a lower pipe.
10. A method of using the check valve for oil drilling as described in any one of claims 8 or 9, characterized in that... Implement according to the following method, The first step is to install the first valve body at the bottom of the drill pipe through the upper pipe. The drilling mud that is delivered in is then transported through the upper pipe, the feed chamber and the guide pipe to the inside of the movable pipe to impact and squeeze the upper end face of the guide cover. The second step is that as the pressure inside the movable tube located on the upper side of the feed guide cover continues to increase, the drilling mud can push the wedge-shaped sealing block sleeved inside the movable tube while pushing the feed guide cover downward, so that the wedge-shaped sealing block moves towards the inside of the transmission groove. The third step is that when the wedge-shaped sealing block is pushed into the transmission slot, the wedge-shaped sealing block slides along the outer wall of the fixed shaft, and the cross cavity slides against the outer wall of the cross plate, compressing the third return spring until the wedge-shaped sealing block is completely retracted into the inner side of the transmission slot. Fourth step: When the wedge-shaped sealing block is fully retracted into the transmission groove, the guide cover can drive the entire movable tube to move down. At this time, the limit rod slides inside the limit slide, and the first reset spring is stretched until the guide port is connected to the space below the installation cavity. At this time, the drilling mud located on the upper side of the guide cover can be transported to the guide cavity through the guide port and discharged from the lower pipe through the guide cavity and the discharge chute. Fifth, when a well kick or blowout occurs downhole, the pressure inside the well increases, and the liquid inside the well will be ejected upwards in the direction of the downhole pressure. When the lower connecting pipe moves down to the high-pressure layer, the high-pressure gas and liquid in the formation enter the lower side of the movable pipe through the bottom of the lower connecting pipe, the discharge chute and the guide cavity. The high-pressure gas and liquid will enter the filling cavity in advance to push the buffer seat upwards. The limiting strip slides inside the strip groove. The upward movement of the buffer seat compresses the second reset spring, thereby buffering and offsetting part of the impact force, so that the impact force acting on the guide cover is weakened. At this time, the wedge-shaped sealing block is located inside the guide port, which can constrain and limit the movable pipe, so that the internal space of the movable pipe located on the upper and lower sides of the guide cover is in a state of isolation and sealing.