Connecting device for vacuum pumping and injection of heat insulation steel pipe

Abstract

The utility model discloses a connecting device for vacuum pumping and injection of a heat insulation steel pipe, which relates to the technical field of vacuum pumping and injection and comprises a vacuum cover assembly, an anti-blocking assembly is connected to the rear side of the vacuum cover assembly and comprises a vertical container barrel and a container plug, an air inlet pipe is connected to the side face of the container barrel, an air outlet pipe is connected to the top of the container barrel, and the bottom of the container barrel is open. A filter screen and an airflow guide plate for preventing particles from smoothly passing through are mounted in the middle of the inner cavity; the filter screen is located above the airflow guide plate, and the airflow guide plate is located at an outlet of the air inlet pipe and is obliquely arranged; the container plug is connected to the lower end of the container cylinder through threads; according to the anti-blocking assembly of the device, the mode that a filter screen, an airflow guide plate and a detachable sealing bottom cover are arranged in a cylindrical container is adopted, most particulate matter in airflow can be intercepted, and blocking of an exhaust pipeline is effectively reduced; the vacuum cover assembly adopts an embedded corrugated pipe mode, so that the sealing effect and the dynamic stability of the device are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumping, and particularly relates to a connection device for vacuum pumping of heat-insulating steel pipes. Background Art

[0002] The connection device is a vacuum sealing device widely used in the production process of heat-insulating pipe pumping. One end is connected to the vacuum unit, and the other end is connected to the steel pipe, which can conveniently form a vacuum pumping channel connecting the vacuum unit and the steel pipe cavity.

[0003] During the air extraction process, particulate matter such as welding slag in the steel pipe is likely to block the air extraction pipeline of the vacuum unit, which is inconvenient to clean, affects the air extraction effect and efficiency, increases the air extraction time, and thus affects production.

[0004] In addition, the existing vacuum connection devices generally adopt the mode of copper rods plus sealing rings, with poor vacuum sealing effect, easy to cause micro-leakage, long pumping time, high energy consumption, and seriously affect production efficiency.

[0005] Therefore, there is an urgent need to develop a new connection device for vacuum pumping of heat-insulating steel pipes. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a connection device for vacuum pumping of heat-insulating steel pipes aiming at the defects existing in the prior art.

[0007] The technical solution of the utility model is: a connection device for vacuum pumping of heat-insulating steel pipes, including a vacuum hood assembly. A anti-blocking assembly is connected to the rear side of the vacuum hood assembly. The anti-blocking assembly includes a vertical container cylinder and a container plug. An air inlet pipe is connected to the side of the container cylinder, an air outlet pipe is connected to the top, and the bottom is open. A filter screen and an air flow guiding plate for blocking the smooth passage of particles are installed in the middle of its inner cavity; the filter screen is located above the air flow guiding plate, the air flow guiding plate is located at the outlet of the air inlet pipe, and it is inclined; the container plug is connected to the lower end of the container cylinder by threads.

[0008] Preferably, the container cylinder adopts a split design, including an upper cylinder body and a lower cylinder body connected by a flange; the filter screen is installed between the two flange plates of the upper cylinder body and the lower cylinder body.

[0009] Preferably, the cross-sectional area of the filter screen is larger than the cross-sectional area of the air outlet pipe.

[0010] Preferably, the container plug is a tubular structure, with internal threads processed, and the bottom end is welded with a blind plate for sealing; a sealing gasket is provided between the lower end of the container cylinder and the container plug.

[0011] Preferably, the vacuum hood assembly includes a vacuum hood housing, a copper electrode, a guiding gland, and a corrugated pipe. One side of the vacuum hood housing is connected with a vacuum nozzle. Its upper end is an electrode mounting opening, and its lower end is a saddle-shaped opening with the same curvature as the steel pipe. The guiding gland is provided with an external thread, which is threadedly installed in the electrode mounting opening. And a guiding sealing ring is arranged between its lower end and the inner wall of the vacuum hood housing. The copper electrode is a cylinder, which is slidably and sealingly inserted into the guiding gland and forms an extrusion seal with the guiding sealing ring. Its lower end extends into the inner cavity of the vacuum hood housing. The corrugated pipe is located in the inner cavity of the vacuum hood housing and is sleeved on the outside of the copper electrode. Its two ends are respectively sealed and fixed on the outer wall of the copper electrode and the inner wall of the vacuum hood housing.

[0012] The lower end of the copper electrode is connected with a welding plug through an electrode joint, and the vacuum nozzle is connected with an intake pipe.

[0013] Preferably, an installation plate with the same curvature as the steel pipe is arranged along the inner edge of the saddle-shaped opening, and an L-shaped sealing ring is clamped on the installation plate.

[0014] Preferably, the upper and lower ends of the corrugated pipe are respectively welded on the outer wall of the copper electrode and the inner wall of the vacuum hood housing.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The anti-blocking assembly of this device adopts a mode of arranging a filter screen, an air flow guiding plate, and a detachable sealing bottom cover in a cylindrical container, which can intercept most of the particulate matters in the air flow, effectively reduce the blockage of the exhaust pipe, facilitate cleaning, improve production efficiency, and ensure the sealing effect of the connection device; the vacuum hood assembly adopts a mode of embedding a corrugated pipe to ensure the sealing effect and dynamic stability of the device; the vacuum hood assembly can further ensure the sealing effect through the L-shaped sealing ring, effectively reduce the leakage of the vacuum chamber, improve efficiency, reduce energy consumption, and has more stable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the anti-blocking assembly in the present invention;

[0018] Figure 2 is a schematic structural diagram of the vacuum hood assembly in the present invention.

[0019] In the figure: 1. Container cylinder, 2. Container plug, 3. Intake pipe, 4. Exhaust pipe, 5. Filter screen, 6. Air flow guiding plate, 7. Sealing gasket, 8. Flange, 9. Vacuum hood housing, 10. Vacuum nozzle, 11. Copper electrode, 12. Guiding gland, 13. Guiding sealing ring, 14. Corrugated pipe, 15. Electrode joint, 16. Welding plug, 17. Installation plate, 18. L-shaped sealing ring, 19. Steel pipe. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following further describes the present utility model in conjunction with the accompanying drawings and embodiments. Embodiment 1

[0021] Referring to Figure 1 As shown, a connecting device for vacuum pumping of a heat-insulating steel pipe 19 includes a vacuum hood assembly. A blockage prevention assembly is connected to the rear side of the vacuum hood assembly. The blockage prevention assembly includes a vertical container cylinder 1 and a container plug 2. An air inlet pipe 3 is connected to the side of the container cylinder 1, an air outlet pipe 4 is connected to the top, and the bottom is open. A filter screen 5 and an air flow guide plate 6 for blocking the smooth passage of particles are installed in the middle of its inner cavity; the filter screen 5 is located above the air flow guide plate 6, and the air flow guide plate 6 is located at the outlet of the air inlet pipe 3 and is inclined; the container plug 2 is threadedly connected to the lower end of the container cylinder 1.

[0022] More specifically, the container cylinder 1 adopts a split design and includes an upper cylinder body and a lower cylinder body connected by a flange 8; the filter screen 5 is installed between the two flange plates of the upper cylinder body and the lower cylinder body.

[0023] The cross-sectional area of the filter screen 5 is larger than the cross-sectional area of the air outlet pipe 4 to ensure the smooth passage of air flow.

[0024] The container plug 2 is a tubular structure, with internal threads processed, and a blind plate is welded at the bottom for sealing; a gasket 7 is provided between the lower end of the container cylinder 1 and the container plug 2 to ensure the airtightness of the container.

[0025] During use, the vacuum hood assembly is installed at a designated position on the outer wall of the steel pipe 19. The air inlet pipe 3 of the blockage prevention assembly is communicated with the vacuum hood assembly, and its air outlet pipe 4 is connected to an air extraction pump; during air extraction, air flow carries particulate matters such as welding slag into the inner cavity of the container cylinder 1 through the air inlet pipe 3. Part of the particulate matters naturally fall to the bottom of the container cylinder 1 under the action of their own gravity. The air flow guide plate 6 plays a role in blocking and reflecting the particulate matters in the air flow, so that part of the particulate matters fall to the bottom of the container cylinder 1; when the air flow flows upward through the filter screen 5, the filter screen 5 intercepts part of the particulate matters again; after using for a period of time, the detachable container plug 2 and the filter screen 5 can be removed to clean the accumulated particulate matters.

[0026] The blockage prevention assembly of this device adopts a mode of arranging a filter screen 5, an air flow guide plate 6 and a detachable sealed bottom cover in a cylindrical container, which can intercept most of the particulate matters in the air flow, effectively reduce the blockage of the air extraction pipeline, facilitate cleaning, improve production efficiency, and ensure the sealing effect of the connecting device. Embodiment 2

[0027] Referring to Figure 2As shown in the figure, the vacuum chamber assembly of this embodiment includes a vacuum chamber housing 9, a copper electrode 11, a guiding gland 12, and a bellows 14. One side of the vacuum chamber housing 9 is connected with a vacuum nozzle 10. Its upper end is an electrode mounting port, and its lower end is a saddle-shaped port with the same curvature as the steel pipe 19. The guiding gland 12 is provided with an external thread, which is threadedly installed in the electrode mounting port, and a guiding sealing ring 13 is provided between its lower end and the inner wall of the vacuum chamber housing 9. The copper electrode 11 is a cylinder, which is slidably and sealingly inserted into the guiding gland 12, and forms an extrusion seal with the guiding sealing ring 13. Its lower end extends into the inner cavity of the vacuum chamber housing 9. The bellows 14 is located in the inner cavity of the vacuum chamber housing 9 and is sleeved outside the copper electrode 11. Its two ends are respectively welded to the outer wall of the copper electrode 11 and the inner wall of the vacuum chamber housing 9.

[0028] The lower end of the copper electrode 11 is connected with a welding plug 16 through an electrode joint 15, and the vacuum nozzle 10 is connected with the intake pipe 3.

[0029] More specifically, an installation plate 17 with the same curvature as the steel pipe 19 is provided along the inner edge of the saddle-shaped port, and an L-shaped sealing ring 18 is clamped on the installation plate 17.

[0030] During use, the vacuum chamber assembly is tightly clamped at a specified position on the outer wall of the steel pipe 19 through the L-shaped sealing ring 18. The steel pipe 19, the copper electrode 11, the bellows 14, the vacuum chamber housing 9, and the L-shaped sealing ring 18 together form a sealed cavity, which is isolated from the external air. The vacuuming operation is carried out through a vacuum pump. After the vacuuming is completed, the copper electrode 11 moves along the guiding gland 12 towards the steel pipe 19 until the welding plug 16 is inserted into the air hole in the wall of the steel pipe 19, and finally the welding plug 16 is welded in the air hole. The bellows 14 expands or compresses with the movement of the copper electrode 11, ensuring the sealing performance of the device.

[0031] The vacuum chamber assembly adopts the mode of embedding the bellows 14 to ensure the sealing effect and dynamic stability of the device. The vacuum chamber assembly can further ensure the sealing effect through the L-shaped sealing ring 18, effectively reduce the leakage of the vacuum chamber, improve the efficiency, reduce the energy consumption, and the performance is more stable.

[0032] The present utility model is not limited to the above-mentioned embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present utility model, and the changed content still falls within the protection scope of the present utility model.

Claims

1. A connection device for vacuum injection of an insulated steel pipe, comprising a vacuum cover assembly, characterized in that: The rear side of the vacuum cover assembly is connected to an anti-blocking assembly, and the anti-blocking assembly includes a vertical container tube and a container plug. The container tube is connected to an air inlet pipe on the side, an air outlet pipe on the top, and an opening at the bottom. A filter screen and an air flow guide plate for blocking particles from passing smoothly are installed in the middle of the inner cavity; the filter screen is located above the air flow guide plate, and the air flow guide plate is located at the outlet of the air inlet pipe and is arranged obliquely; the container plug is connected to the lower end of the container tube by threads.

2. A heat-insulated steel pipe vacuum injection connection device according to claim 1, characterized in that: The container cylinder adopts a split design, including an upper cylinder and a lower cylinder connected by a flange; the filter screen is installed between two flange plates of the upper cylinder and the lower cylinder.

3. A heat-insulated steel pipe vacuum injection connection device according to claim 1, characterized in that: The cross-sectional area of ​​the filter screen is larger than the cross-sectional area of ​​the air outlet pipe.

4. A heat-insulated steel pipe vacuum injection connection device according to claim 1, characterized in that: The container plug is a tubular structure with an internal thread and a blind plate welded at the bottom for sealing; a sealing gasket is provided between the lower end of the container tube and the container plug.

5. The connection device for vacuum injection of heat-insulated steel pipe according to claim 1, characterized in that: The vacuum cover assembly comprises a vacuum cover shell, a copper electrode, a guide pressure cover and a bellows. A vacuum nozzle is connected to one side of the vacuum cover shell, the upper end of which is an electrode mounting port, and the lower end of which is a saddle-shaped port with the same curvature as the steel pipe; the guide pressure cover is provided with an external thread, the thread of which is installed in the electrode mounting port, and a guide sealing ring is provided between the lower end and the inner wall of the vacuum cover shell; the copper electrode is a cylinder, the sliding seal of which is inserted in the guide pressure cover and forms an extrusion seal with the guide sealing ring, and the lower end of which protrudes into the inner cavity of the vacuum cover shell; the bellows is located in the inner cavity of the vacuum cover shell, and is sleeved on the outer side of the copper electrode, and the two ends of the bellows are respectively sealed and fixed on the outer wall of the copper electrode and the inner wall of the vacuum cover shell; The lower end of the copper electrode is connected to a welding plug through an electrode joint, and the vacuum nozzle is connected to an air inlet pipe.

6. A heat-insulated steel pipe vacuum injection connection device according to claim 5, characterized in that: The inner edge of the saddle-shaped opening is provided with a mounting plate with the same curvature as the steel pipe, and an L-shaped sealing ring is clamped on the mounting plate.

7. A heat-insulated steel pipe vacuum injection connection device according to claim 5, characterized in that: The upper and lower ends of the bellows are respectively welded to the outer wall of the copper electrode and the inner wall of the vacuum cover shell.

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