Anti-suck-back feeding intubation tube

Abstract

The utility model discloses an anti-suck-back feeding intubation tube which comprises an outer sleeve, a feeding tube, an inner intubation tube and a telescopic mechanism, and the outer sleeve is used for being installed on a container in a penetrating mode; the feeding pipe is fixedly connected to one side of the outer sleeve; an inner inserting pipe is movably connected to the inner side of the outer sleeve, and a strip-shaped hole aligned to the end of the feeding pipe is formed in the inner inserting pipe in the axial direction; the telescopic mechanism is installed on the outer sleeve, and the movable end of the telescopic mechanism is connected with the inner insertion pipe and used for driving the inner insertion pipe to ascend or descend in the axial direction of the outer sleeve. According to the anti-suck-back feeding intubation tube provided by the utility model, a liftable structure of the inner intubation tube is formed through the outer sleeve, the feeding tube, the inner intubation tube and the telescopic mechanism, and the through feeding channel is arranged in the lifting process, so that a first position state that the inner intubation tube is inserted below the liquid level of a container is formed; in the second position state, the inner inserting pipe is suspended above the liquid level of the container, and in the second position state, liquid can be effectively prevented from being sucked back.

Description

Technical Field

[0001] This utility model relates to the technical field of anti-backflow equipment, specifically to an anti-backflow feeding tube. Background Technology

[0002] In chemical plants using pressure vessels or reactors, inserting the feed pipe below the liquid surface ensures a more stable entry of materials and prevents cavitation. Therefore, most feed pipes are inserted below the liquid surface to improve safety and efficiency. However, during temporary shutdowns, maintenance, or valve failures of the pressure vessel, backflow may occur at the feed pipe. To prevent backflow, check valves or one-way valves are typically used. For example, Chinese Patent 202221347231.6 discloses a negative pressure drainage bottle for backflow prevention. The backflow prevention device is a funnel with a gradually decreasing inner diameter from top to bottom, and a one-way valve is installed at the lower end of the device.

[0003] In the aforementioned prior art, check valves or one-way valves are very effective devices in preventing liquid backflow or reverse flow. However, in practical applications, they are prone to failure due to improper valve selection and material corrosion during use. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose an anti-backflow feeding tube to solve the technical problem that one-way valves or check valves in the prior art are prone to failure due to improper valve selection and material corrosion during use.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This utility model provides an anti-backflow feeding tube, comprising:

[0007] An outer sleeve, used for through-hole installation on a container;

[0008] The feed pipe is fixedly connected to one side of the outer sleeve;

[0009] An inner insert tube, movably connected to the inner side of the outer sleeve, has an axially oriented strip-shaped hole aligned with the end of the feed tube; and

[0010] A telescopic mechanism is installed on the outer sleeve, and its movable end is connected to the inner tube. It is used to drive the inner tube to rise or fall along the axial direction of the outer sleeve, so that the inner tube can switch between a first position state below the liquid surface of the container and a second position state suspended above the liquid surface of the container.

[0011] In some embodiments, a sealing sleeve is provided on the outer side of the inner tube, and the sealing sleeve fits against the inner wall of the outer sleeve for sealing between the inner tube and the outer sleeve.

[0012] In some embodiments, the length of the sealing sleeve is greater than the length of the strip-shaped hole, and the sealing sleeve has an opening that matches the strip-shaped hole.

[0013] In some embodiments, one end of the feed tube passes through the outer sleeve and the strip-shaped hole in sequence, and extends to the inside of the feed tube.

[0014] In some embodiments, the inner tube also has a third position state where it abuts against the bottom wall of the strip-shaped hole, and a sealing sheet is provided on the inner side of the inner tube. In the third position state, the sealing sheet covers one end of the feed tube that extends into the feed tube.

[0015] In some embodiments, the inner top wall and inner bottom wall of the strip-shaped hole are provided with arc surfaces that match the outer diameter of the feed pipe.

[0016] In some embodiments, the telescopic mechanism includes a multi-section hydraulic telescopic rod, one end of which is fixed to the inner top wall of the outer sleeve, and the other end is connected to the top end of the inner tube.

[0017] In some embodiments, the telescopic mechanism includes a multi-section electric telescopic rod, one end of which is fixed to the inner top wall of the outer sleeve, and the other end is connected to the top end of the inner tube.

[0018] In some embodiments, the outer sleeve includes a first cylinder and a second cylinder, the first cylinder and the second cylinder are detachably connected, the top end of the second cylinder is sealed, the telescopic mechanism is installed inside the second cylinder, the feed pipe is fixedly connected to the outside of the first cylinder, and the inner insertion tube is slidably connected to the inside of the first cylinder.

[0019] In some embodiments, a flange is provided at one end of the first cylinder opposite to the second cylinder, and the two flanges are connected by bolts and nuts.

[0020] Compared with the prior art, the anti-backflow feeding tube provided by this utility model forms a structure in which the inner tube can be raised and lowered through an outer sleeve, a feeding tube, an inner tube and a telescopic mechanism. It has a through feeding channel during the raising and lowering process, forming a first position state in which the inner tube is inserted below the liquid surface of the container, and a second position state in which the inner tube is suspended above the liquid surface of the container. In the second position state, it can effectively prevent liquid backflow. Attached Figure Description

[0021] Figure 1This is a three-dimensional view of the anti-backflow feeding tube provided in this embodiment of the utility model;

[0022] Figure 2 This is a three-dimensional exploded view of the anti-backflow feeding tube provided in this embodiment of the utility model;

[0023] Figure 3 This is a front sectional view of the anti-backflow feeding tube provided in this embodiment of the utility model;

[0024] Figure 4 This is a first position diagram of the anti-backflow feeding tube provided in this embodiment of the utility model;

[0025] Figure 5 This is a second position diagram of the anti-backflow feed tube provided in this embodiment of the utility model;

[0026] Figure 6 This is a diagram showing the third position of the anti-backflow feeding tube provided in this embodiment of the utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Outer sleeve; 11. First cylinder; 12. Second cylinder; 101. Flange; 2. Feed pipe; 3. Inner tube; 301. Strip hole; 302. Arc surface; 4. Telescopic mechanism; 5. Sealing sleeve; 501. Port; 6. Sealing plate; 7. Container; 701. Liquid level line. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] To address the technical problem that check valves or one-way valves are prone to failure due to improper valve selection and material corrosion during use, this utility model provides an anti-backflow feed tube that can controllably raise the retractable tube above the liquid surface, effectively preventing liquid backflow.

[0031] It should be noted that the anti-backflow feed tube of this utility model is used in, but not limited to, pressure vessels. For ease of explanation, this utility model only uses the application of the anti-backflow feed tube in pressure vessels as an example. The principle of the anti-backflow feed tube in other types of equipment is essentially the same as that in pressure vessels, and will not be described in detail here.

[0032] See also Figure 1-5This utility model provides an anti-backflow feeding tube, which includes an outer sleeve 1, a feeding pipe 2, an inner tube 3, and a telescopic mechanism 4. The outer sleeve 1 is used for through-mounting on a container 7; the feeding pipe 2 is fixedly connected to one side of the outer sleeve 1 for feeding; the inner tube 3 is movably connected to the inside of the outer sleeve 1 and can slide up and down along the outer sleeve 1 to adjust the height position of the inner tube 3 inside the container 7. The inner tube 3 has a strip axially aligned with the end of the feeding pipe 2. During vertical movement, the feed pipe 2 remains aligned with the slotted hole 301, forming a continuous feeding channel. This ensures that the feeding medium is not interrupted during the height adjustment process of the inner tube 3. The telescopic mechanism 4 is mounted on the outer sleeve, and its movable end is connected to the inner tube 3. It drives the inner tube 3 to rise or fall axially along the outer sleeve 1, switching the inner tube 3 between a first position below the liquid surface and a second position above the liquid surface. In the first position, the inner tube 3 is inserted below the liquid surface, ensuring a more stable entry of material into the container and preventing cavitation. In the second position, the inner tube 3 is suspended above the liquid surface, effectively preventing backflow of liquid.

[0033] In one embodiment, please refer to Figure 2 and Figure 3 In order to seal during the sliding and telescoping of the inner tube 3, a sealing sleeve 5 is provided on the outer side of the inner tube 3. The sealing sleeve 5 fits against the inner wall of the outer sleeve 1 and is used to seal between the inner tube 3 and the outer sleeve 1.

[0034] Furthermore, in order to provide a good sealing effect, especially to seal the outer periphery of the strip-shaped hole 301, the length of the sealing sleeve 5 is greater than the length of the strip-shaped hole 301, and the sealing sleeve 5 is provided with an opening 501 that matches the strip-shaped hole 301. The opening 501 prevents the sealing sleeve 5 from blocking the strip-shaped hole 301, and the sealing sleeve 5 covering the outer periphery of the strip-shaped hole 301 can effectively fit with the outer sleeve 1 to seal the gap and prevent leakage at the medium flow point between the feed pipe 2 and the inner insertion pipe 3.

[0035] In one embodiment, please refer to Figure 3 In order to limit the upper and lower positions during the lifting and lowering of the inner tube 3, one end of the feed tube 2 passes through the outer sleeve 1 and the strip-shaped hole 301 in sequence and extends to the inner side of the feed tube 2. Thus, when the inner tube 3 descends to the lowest position, the inner top wall of the strip-shaped hole 301 abuts against the top of the feed tube 2. Similarly, when the inner tube 3 rises to the highest position, the inner bottom wall of the strip-shaped hole 301 abuts against the bottom of the feed tube 2, thus forming the upper and lower limits of the lifting and lowering of the inner tube 3.

[0036] Furthermore, the inner top wall and inner bottom wall of the strip-shaped hole 301 are provided with arc surfaces 302 that match the outer diameter of the feed pipe 2, so that the feed pipe 2 can fit together when it comes into contact with the inner top wall and inner bottom wall of the strip-shaped hole 301.

[0037] In one embodiment, please refer to Figure 6 To provide double protection against backflow, the inner tube 3 also has a third position state where it abuts against the inner bottom wall of the strip-shaped hole 301. A sealing plate 6 is provided on the inner side of the inner tube 3. In the third position state, the sealing plate 6 covers the end of the feed tube 2 that extends into the feed tube 2. That is, in the third position state, the channel through which the medium passes is directly closed. Together with raising the inner tube 3 above the liquid level line 701, this forms a double protection against backflow.

[0038] In one embodiment, please refer to Figure 2 To facilitate the disassembly and maintenance of the telescopic mechanism 4, the outer sleeve 1 includes a first cylinder 11 and a second cylinder 12. The first cylinder 11 and the second cylinder 12 are detachably connected. The top end of the second cylinder 12 is sealed. The telescopic mechanism 4 is installed inside the second cylinder 12. The feed pipe 2 is fixedly connected to the outside of the first cylinder 11. The inner insertion pipe 3 is slidably connected to the inside of the first cylinder 11. The telescopic mechanism 4 can be disassembled and maintained by separating the first cylinder 11 and the second cylinder 12.

[0039] Understandably, during assembly, the telescopic mechanism 4 is first installed into the second cylinder 12, then the telescopic end of the telescopic mechanism 4 is fixedly connected to the inner tube 3, and then the first cylinder 11 and the second cylinder 12 are connected and tightened.

[0040] Furthermore, a flange 101 is provided at one end of the first cylinder 11 and the second cylinder 12 opposite to each other. The two flanges 101 are connected by bolts and nuts, which facilitates the connection and disassembly of the first cylinder 11 and the second cylinder 12.

[0041] Optionally in this embodiment, the telescopic mechanism 4 includes a multi-section hydraulic telescopic rod, one end of which is fixed to the inner top wall of the outer sleeve 1, and the other end is connected to the top end of the inner insertion tube 3.

[0042] Optionally in this embodiment, the telescopic mechanism 4 includes a multi-section electric telescopic rod, one end of which is fixed to the inner top wall of the outer sleeve 1, and the other end is connected to the top end of the inner insertion tube 3.

[0043] Understandably, multi-section hydraulic telescopic rods and multi-section electric telescopic rods are just two optional devices with telescopic functions. Other drive components with linear telescopic functions can also be used, and there is no single limitation here.

[0044] To better understand this utility model, the following is combined with... Figures 1 to 6 The technical solution of this utility model is described in detail as follows: In the first position, the bottom end of the inner tube 3 is inserted below the liquid level 701 of the pressure vessel 7, and the pressure vessel 7 is normally fed through the channel formed by the feed pipe 2, the strip-shaped hole 301, and the inner tube 3; In the second position, the bottom end of the inner tube 3 is raised above the liquid level 701 of the pressure vessel, which can prevent liquid backflow when the pressure vessel is temporarily shut down, under maintenance, or when the valve fails; In the third position, the inner tube 3 continues to rise, and the sealing plate 6 is sealed to the end of the feed pipe 2, thereby forming a second layer of anti-backflow measures and providing double insurance against backflow.

[0045] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A feed tube for preventing backflow, characterized in that, include: An outer sleeve, used for through-hole installation on a container; The feed pipe is fixedly connected to one side of the outer sleeve; An inner insert tube, movably connected to the inner side of the outer sleeve, has an axially oriented strip-shaped hole aligned with the end of the feed tube; and A telescopic mechanism is installed on the outer sleeve, and its movable end is connected to the inner tube. It is used to drive the inner tube to rise or fall along the axial direction of the outer sleeve, so that the inner tube can switch between a first position state below the liquid surface of the container and a second position state suspended above the liquid surface of the container.

2. The anti-backflow feed tube according to claim 1, characterized in that, A sealing sleeve is provided on the outer side of the inner tube, and the sealing sleeve fits against the inner wall of the outer sleeve for sealing between the inner tube and the outer sleeve.

3. The anti-backflow feed tube according to claim 2, characterized in that, The length of the sealing sleeve is greater than the length of the strip-shaped hole, and the sealing sleeve has an opening that matches the strip-shaped hole.

4. The anti-backflow feed tube according to claim 3, characterized in that, One end of the feed tube passes through the outer sleeve and the strip-shaped hole in sequence, and extends to the inside of the feed tube.

5. The anti-backflow feed tube according to claim 4, characterized in that, The inner tube also has a third position state where it abuts against the bottom wall of the strip-shaped hole. A sealing plate is provided on the inner side of the inner tube. In the third position state, the sealing plate covers the end of the feed tube that extends into the feed tube.

6. The anti-backflow feed tube according to claim 5, characterized in that, The inner top and bottom walls of the strip-shaped hole are both provided with arc surfaces that match the outer diameter of the feed pipe.

7. The anti-backflow feed tube according to claim 1, characterized in that, The telescopic mechanism includes multiple hydraulic telescopic rods, one end of which is fixed to the inner top wall of the outer sleeve, and the other end is connected to the top of the inner tube.

8. The anti-backflow feed tube according to claim 1, characterized in that, The telescopic mechanism includes a multi-section electric telescopic rod, one end of which is fixed to the inner top wall of the outer sleeve, and the other end is connected to the top of the inner tube.

9. The anti-backflow feed tube according to claim 1, characterized in that, The outer sleeve includes a first cylinder and a second cylinder, the first cylinder and the second cylinder are detachably connected, the top end of the second cylinder is sealed, the telescopic mechanism is installed inside the second cylinder, the feed pipe is fixedly connected to the outside of the first cylinder, and the inner insertion tube is slidably connected to the inside of the first cylinder.

10. The anti-backflow feed tube according to claim 9, characterized in that, The first cylinder body is provided with a flange at one end opposite to the second cylinder body, and the two flanges are connected by bolts and nuts.

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