Self-adjusting liquid pipe expansion preventing structure

Abstract

The utility model relates to a self-adjusting liquid pipe expansion preventing structure, and belongs to the technical field of chemical liquid conveying pipelines. The self-adjusting liquid pipe expansion preventing structure is arranged at the position lower than the conveying pipeline and is combined with the buffer pipe, so that liquid compresses gas in the buffer pipe through self-flowing during pipe expansion to adjust and balance pressure in the pipeline, and meanwhile, a safety valve, a pressure gauge, a stop valve and the like are additionally arranged to further control safety of the self-adjusting liquid pipe expansion preventing structure. According to the whole structure, the self-adjusting liquid pipe expansion preventing effect can be achieved, limitation of the installation space is avoided, the liquid pipe expansion preventing device can be installed in any working face lower than the first valve and the second valve, and safety guarantee is achieved.

Description

Technical Field

[0001] The utility model relates to a self-adjusting liquid expansion-proof pipe structure, belonging to the technical field of chemical infusion pipelines. Background Art

[0002] In chemical plants, pipelines are usually used to transport raw liquids from storage tanks in the tank area to the production workshop for subsequent processing operations. However, during the summer transportation process, due to the large temperature difference between day and night, the liquid pressure in the pipeline is affected by temperature and becomes extremely unstable. The sudden increase in pressure often causes the pipeline to rupture, which not only causes the leakage and loss of raw liquids, but also endangers the lives of operators and causes accidents.

[0003] At present, in the existing production process, it is usually necessary to send personnel to regularly check the pressure conditions at the delivery pipeline. This practice is not only costly and labor-intensive, but also cannot avoid the loopholes in manual inspection. At present, there is a liquid pipeline self-pressure relief device, such as CN212004749U, which requires the outlet of the one-way valve to be connected to the pressure relief pipe for pressure relief, but it has the problem that the raw material liquid is easy to be left empty or blocked in the pipeline, which also poses risks; or, for example, a system for preventing liquid expansion in the pipeline, such as CN104613317A, which involves an overpressure reflux device that is difficult to install and use in actual production due to space limitations.

[0004] Therefore, there is currently no method that can solve the problem of pipeline rupture while ensuring safety and ease of installation. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a self-adjusting anti-liquid expansion pipe structure, which is installed on a delivery pipeline connecting a storage tank and a production line. The delivery pipeline is respectively provided with a first valve and a second valve at a position close to the storage tank and a position close to the production line. The self-adjusting anti-liquid expansion pipe structure includes:

[0006] A cut-off valve connected to the delivery pipeline between the first valve and the second valve;

[0007] A cache tube, wherein the cache tube has a lower pipe opening and an upper pipe opening, the lower pipe opening is connected to the cut-off valve, the cache tube contains raw material liquid, and a gap is left between the liquid level of the raw material liquid and the upper pipe opening;

[0008] The detection unit is connected to the upper pipe opening of the cache pipe.

[0009] It should be understood that the self-adjusting anti-liquid expansion structure can be connected to any point on the delivery pipeline between the first valve and the second valve through a longer pipe. Therefore, the self-adjusting anti-liquid expansion structure can be pre-buried or installed on any other working surface, and will not interfere with the space of the delivery pipeline, and there is no need to expand the space near the delivery pipeline.

[0010] Furthermore, the shut-off valve is connected to the delivery pipeline between the first valve and the second valve through a three-way structure, and the height of the shut-off valve and the three-way structure is lower than the height of the first valve and the second valve. Such an arrangement enables the three-way structure, the first valve and the second valve to form a U-shaped connection, so that the three-way structure is at the lowest point relative to the first valve and the second valve, thereby preventing the raw material liquid from being retained or left empty in the three-way pipe during tube expansion.

[0011] Furthermore, the self-adjusting anti-liquid expansion structure also includes a safety valve located at the same height as the shut-off valve, and the safety valve connects the shut-off valve and the cache tube. The height of the cache tube is higher than the height of the shut-off valve and the safety valve. Such a setting enables the raw liquid to automatically rise into the cache tube after the internal pressure of the pipeline increases and compress the gas in the upper gap, effectively balancing the pressure in the pipeline and reducing the risk of expansion; at the same time, it can also release the safety valve for maintenance and eliminate risks when risks occur inside or liquid blockage occurs.

[0012] In one embodiment of the utility model, the upper pipe mouth and the lower pipe mouth of the cache tube are both configured with flanges and flange covers, and the flanges and flange covers are connected and fixed by gaskets, bolts, and seals. Such a setting can ensure the sealing of the connection and prevent leakage of raw material liquid or air pressure.

[0013] Furthermore, the detection unit includes a check valve connected to the upper pipe port and a pressure gauge connected to the check valve, which are used to check the pressure inside the cache tube to prevent the cache tube from bursting.

[0014] Furthermore, the cache tube is provided with a sight glass and a ruler, which are convenient for checking and recording the liquid level of the raw material liquid in the cache tube.

[0015] Beneficial effects of the utility model:

[0016] The utility model arranges the self-adjusting anti-liquid expansion structure at a position lower than the conveying pipeline and combines it with a buffer tube to realize that when the tube is expanded, the liquid flows by gravity and compresses the gas in the buffer tube to adjust and balance the pressure in the pipeline. At the same time, a safety valve, a pressure gauge, a shut-off valve, etc. are added to further control its safety. The overall structure can not only achieve the self-adjusting anti-liquid expansion effect, but also is not limited by the installation space. It can be installed in any working surface below the first valve and the second valve, and also has safety assurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a self-adjusting anti-liquid expansion tube structure installed on a delivery pipeline in one embodiment of the utility model;

[0018] Figure 2 This is an overall cross-sectional view of a self-adjusting anti-liquid expansion tube structure in one embodiment of the utility model;

[0019] In the figure: 1. first valve; 2. second valve; 3. shut-off valve; 4. safety valve; 5. flange cover; 6. flange; 7. gasket and bolts; 8. buffer tube; 9. inspection valve; 10. pressure gauge. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example 1

[0024] The utility model provides a self-adjusting anti-liquid expansion pipe structure, which is installed on a delivery pipeline connecting a storage tank and a production line. The delivery pipeline is respectively provided with a first valve 1 and a second valve 2 at a position close to the storage tank and a position close to the production line. The self-adjusting anti-liquid expansion pipe structure comprises:

[0025] A cut-off valve 3 connected to the delivery pipeline between the first valve 1 and the second valve 2;

[0026] A cache pipe 8, wherein the cache pipe 8 has a lower pipe opening and an upper pipe opening, the lower pipe opening is connected to the cut-off valve 3, the cache pipe 8 contains raw material liquid, and a gap is left between the liquid level of the raw material liquid and the upper pipe opening;

[0027] The detection unit is connected to the upper pipe opening 8 of the cache pipe.

[0028] The shut-off valve 3 is connected to the delivery pipeline between the first valve 1 and the second valve 2 through a three-way structure, and the height of the shut-off valve 3 and the three-way structure is lower than the height of the first valve 1 and the second valve 2. Such an arrangement enables the three-way structure, the first valve 1, and the second valve 2 to form a U-shaped connection, so that the three-way structure is at the lowest point relative to the first valve 1 and the second valve 2, thereby preventing the raw material liquid from being retained or left empty in the three-way pipe during tube expansion.

[0029] The self-adjusting anti-liquid expansion structure also includes a safety valve 4 located at the same height as the cut-off valve, and the safety valve 4 connects the cut-off valve 3 and the buffer tube 8. The height of the buffer tube 8 is higher than the height of the cut-off valve 3 and the safety valve 4. Such a setting enables the raw material liquid to automatically rise into the buffer tube 8 after the internal pressure of the pipeline increases and compress the gas in the upper gap, effectively balancing the pressure in the pipeline and reducing the risk of expansion; at the same time, it can also release the safety valve 4 for maintenance and eliminate risks when risks or liquid blockage occur inside.

[0030] The upper and lower pipe openings of the cache tube 8 are both provided with flanges 6 and flange covers 5, and the flanges 6 and flange covers 5 are connected and fixed by gaskets, bolts 7 and seals. Such a setting can ensure the sealing of the connection and prevent leakage of raw material liquid or air pressure.

[0031] The detection unit includes a check valve 9 connected to the upper pipe port and a pressure gauge 10 connected to the check valve 9, which are used to check the pressure inside the cache tube to prevent the cache tube from bursting.

[0032] The buffer tube 8 is also provided with a sight glass and a ruler to facilitate viewing and recording the liquid level of the raw material liquid in the buffer tube.

[0033] The working principle of this utility model:

[0034] Pre-fill the buffer tube 8 with raw material liquid and ensure that there is space above the liquid surface. Connect the self-adjusting anti-liquid expansion tube structure to the lowest point below the delivery pipeline between the first valve 1 and the second valve 2.

[0035] During the process of transporting the raw liquid through the conveying pipeline, when the technician detects that there is a risk of tube expansion caused by the increase of internal pressure in the pipeline, it is only necessary to open the shut-off valve 3. Then, the raw liquid will rise to the buffer tube 8 under high pressure and compress the gas in the gap upward to adjust the pressure balance in the pipeline. The adjustment data can be recorded through the sight glass and ruler of the buffer tube 8 to further adjust the material conveying process to prevent tube expansion. During the process, the pressure in the buffer tube 8 can be checked through the pressure gauge 10 to prevent the buffer tube 8 from rupture. When there is a pressure risk in the buffer tube 8, the inspection valve 9 can be opened in time to release the pressure and perform maintenance in time.

[0036] When there is a situation in which raw material liquid is retained or blocked between the buffer pipe 8 and the cut-off valve 3 inside the pipeline, the safety valve 4 can be opened in time to release the pressure and perform repairs.

[0037] Although the present invention has been disclosed as above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A self-adjusting anti-liquid expansion pipe structure, installed in a delivery pipeline connecting a storage tank and a production line, wherein the delivery pipeline is provided with a first valve and a second valve at a position close to the storage tank and a position close to the production line, respectively, characterized in that: The self-adjusting anti-liquid expansion tube structure comprises: A cut-off valve connected to the delivery pipeline between the first valve and the second valve; A cache tube, wherein the cache tube has a lower pipe opening and an upper pipe opening, the lower pipe opening is connected to the cut-off valve, the cache tube contains raw material liquid, and a gap is left between the liquid level of the raw material liquid and the upper pipe opening; The detection unit is connected to the upper pipe opening of the cache pipe.

2. A self-adjusting anti-liquid expansion tube structure according to claim 1, characterized in that: The shut-off valve is connected to the delivery pipeline between the first valve and the second valve via a three-way structure, and the height of the shut-off valve and the three-way structure is lower than the height of the first valve and the second valve.

3. A self-adjusting anti-liquid expansion tube structure according to claim 2, characterized in that: The self-adjusting anti-liquid expansion tube structure also includes a safety valve located at the same height as the cut-off valve, and the safety valve connects the cut-off valve and the cache tube.

4. A self-adjusting anti-liquid expansion tube structure according to claim 3, characterized in that: The height of the location of the cache tube is higher than the height of the location of the cut-off valve and the safety valve.

5. The self-adjusting anti-liquid expansion tube structure according to claim 1, characterized in that: The upper pipe opening and the lower pipe opening of the cache tube are both configured with a flange and a flange cover, and the flange and the flange cover are connected and fixed by gaskets, bolts and sealing members.

6. A self-adjusting anti-liquid expansion tube structure according to claim 5, characterized in that: The detection unit comprises a check valve connected to the upper pipe opening and a pressure gauge connected to the check valve.

7. The self-adjusting anti-liquid expansion tube structure according to claim 1, characterized in that: The cache tube is equipped with a sight glass and a ruler.

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