Inlet pipeline structure of vertical liquid storage tank pump

Abstract

The utility model discloses a vertical liquid storage tank pump inlet pipeline structure which comprises a pump inlet pipeline, a horizontal pipeline and a slope pipeline which are sequentially connected, the pump inlet pipeline is vertically arranged downwards along a storage tank pipeline nozzle, and the horizontal pipeline is connected to the lower end of the pump inlet pipeline. The gradient pipeline is arranged above the horizontal pipeline, the lower end of the gradient pipeline is connected with the horizontal pipeline, a stop valve is arranged on the gradient pipeline, the upper end of the capillary pipeline is connected with a storage tank, and the lower end of the capillary pipeline extends to the inner bottom of the horizontal pipeline. The utility model aims to solve the technical problems in the prior art, and provides a vertical liquid storage tank pump inlet pipeline structure which can keep low-temperature liquid in a horizontal pipeline circulating and thoroughly block the risks of dry evaporation and hydrocarbon precipitation at the dead end of the pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature storage tanks, in particular to an inlet pipeline structure of a vertical liquid storage tank pump. Background Art

[0002] As an important supporting device of air separation equipment, the storage tank plays an important role in peak load regulation and emergency supply guarantee of air separation. As the power provider for transporting gas from the storage tank to the customer's gas point in an emergency, the reliability of the pump must be guaranteed, so the reasonable layout of its inlet and outlet pipelines has a great impact on the stable operation of the pump.

[0003] The vibration problem of the pump inlet pipeline is more complicated. The most common reason is that bubbles are mixed into the liquid pipeline and cannot be discharged smoothly.

[0004] Due to the requirement of pump cavitation margin, the pump inlet pipe has to form a downward dead end outside the storage tank. After the pump stops, it will evaporate and continue to concentrate, causing hydrocarbon precipitation and increasing the risk of explosion. Utility Model Content

[0005] 1. Technical problems to be solved by the utility model

[0006] The utility model aims to solve the technical problems existing in the prior art and provides a vertical liquid storage tank pump inlet pipeline structure, which can keep the low-temperature liquid in the horizontal pipeline circulating and completely block the risk of dry evaporation at the dead end of the pipeline and the precipitation of hydrocarbons.

[0007] 2. Technical solution

[0008] In order to solve the above problems, the technical solution provided by the utility model is:

[0009] A vertical liquid storage tank pump inlet pipeline structure comprises a pump inlet pipeline, a horizontal pipeline and a slope pipeline connected in sequence, wherein the pump inlet pipeline is arranged vertically downward along the storage tank pipeline nozzle, the horizontal pipeline is connected to the lower end of the pump inlet pipeline, the slope pipeline is arranged above the horizontal pipeline and the lower end is connected to the horizontal pipeline, a cut-off valve is provided on the slope pipeline, and a capillary pipeline is also included, wherein the upper end of the capillary pipeline is connected to the storage tank, and the lower end of the capillary pipeline extends to the inner bottom of the horizontal pipeline.

[0010] Optionally, the lower end of the capillary channel is provided with an oblique cut of 30°-60°.

[0011] Optionally, the capillary channel includes an upper capillary channel connected to a storage tank; a lower capillary channel connected to a horizontal channel; a horizontal capillary channel connecting the upper capillary channel and the lower capillary channel; the horizontal capillary channel is inclined, and the higher end of the horizontal capillary channel is connected to the upper capillary channel.

[0012] Optionally, the slope of the horizontal capillary channel is 3°-5°.

[0013] Optionally, the slope of the slope pipeline is 3°-5°.

[0014] Optionally, a drainage pipe is provided on the slope pipe at the lowest point on the rear side of the cut-off valve.

[0015] Optionally, the height difference between the lowest point of the slope pipeline and the horizontal pipeline is not less than the diameter of the pump inlet pipeline.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0018] The inlet pipeline structure of the vertical liquid storage tank pump effectively reduces the risk of cavitation through the arrangement of pipeline slope, horizontal pipeline and capillary siphon without adding any additional safety devices, and blocks the risk of hydrocarbon accumulation caused by dry evaporation of liquid when the pump is stopped, thereby eliminating the risk of fire and explosion of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of an inlet pipeline structure of a vertical liquid storage tank pump proposed in an embodiment of the utility model;

[0020] 1. Pump inlet pipe; 2. Horizontal pipe; 3. Slope pipe; 4. Shut-off valve; 5. Capillary pipe; 51. Upper capillary pipe; 52. Lower capillary pipe; 53. Horizontal capillary pipe; 6. Drain pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and do not limit the protection scope of the utility model.

[0022] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed on" or "installed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. Further, when an element is considered to be "fixedly connected to" another element, the two may be fixed in a detachable connection manner or in a non-detachable connection manner, such as socketing, snap-on, one-piece fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] The “first” and “second” involved in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0025] Combined with Figure 1 A vertical liquid storage tank pump inlet pipeline structure of the present embodiment includes a pump inlet pipeline 1, a horizontal pipeline 2 and a slope pipeline 3 connected in sequence. The upper end of the pump inlet pipeline 1 is connected to the storage tank and is arranged vertically downward along the storage tank pipeline mouth. The horizontal pipeline 2 is connected to the lower end of the pump inlet pipeline 1. The slope pipeline 3 is arranged above the horizontal pipeline 2. The slope of the slope pipeline 3 is 3°-5°. The lower end of the slope pipeline 3 is connected to the horizontal pipeline 2, and the higher end of the slope pipeline 3 is connected to the liquid pump. The slope pipeline 3 is provided with a cut-off valve 4 and also includes a capillary pipeline 5. The upper end of the capillary pipeline 5 is connected to the storage tank, and the lower end of the capillary pipeline 5 extends to the inner bottom of the horizontal pipeline 2. By setting a continuous slope, the bubbles mixed into the slope pipeline 3 can smoothly enter the pump cavity through the slope, and then the bubbles can be smoothly discharged using the exhaust pipe outlet of the pump itself.

[0026] The inlet pipe structure of the vertical liquid storage tank pump inserts the capillary pipe 5 into the bottom of the horizontal pipe 2. When the pump stops, the inlet shut-off valve 4 is closed, and the low-temperature liquid in the pipe between the shut-off valve 4 and the storage tank will be heated and vaporized by the room temperature air, causing the pressure to increase. A siphon phenomenon will occur through the capillary pipe 5, and the liquid at the position of the horizontal pipe 2 will flow back into the storage tank, forming a circulation with the inlet pipe, so that the low-temperature liquid in the horizontal pipe 2 can keep circulating, completely blocking the risk of dry evaporation at the dead end of the pipe and the precipitation of hydrocarbons.

[0027] As a preferred solution of the present utility model, the length of the horizontal pipe 2 is 300-400 mm.

[0028] As a preferred solution of the utility model, in order to prevent the clogging of solid particles such as welding slag in the inlet main pipe, the lower end of the capillary pipe 5 is provided with an oblique cut of 30°-60°.

[0029] As a preferred solution of the present utility model, the capillary pipe 5 is a DN10 or DN15 pipe.

[0030] As a preferred embodiment of the present invention, the capillary channel 5 includes an upper capillary channel 51 connected to the storage tank; a lower capillary channel 52 connected to the horizontal channel 2; and a horizontal capillary channel 53 connecting the upper capillary channel 51 and the lower capillary channel 52; the upper capillary channel 51 and the lower capillary channel 52 are both vertically arranged, and the horizontal capillary channel 53 is inclinedly arranged, the higher end of the horizontal capillary channel 53 is connected to the upper capillary channel 51, and the lower end of the horizontal capillary channel 53 is connected to the lower capillary channel 52. The horizontal capillary channel 53 is arranged to compensate for the vertical contraction of the channel, and in order to ensure that the low-temperature liquid flows back into the storage tank more smoothly due to the siphon effect, and to avoid the bag-shaped bending caused by the sinking of the horizontal section of the capillary channel 5 under the action of gravity, the horizontal capillary channel 53 needs to be pre-set with a slope of 3%-5%.

[0031] As a preferred embodiment of the present invention, a drainage pipe 6 is provided at the lowest point on the slope pipe 3 located behind the cut-off valve 4. The rear side of the cut-off valve 4 refers to the side of the cut-off valve 4 facing away from the horizontal pipe 2. The drainage pipe 6 is provided at the bottom of the slope pipe 3. The drainage pipe 6 is used to drain the low-temperature liquid retained in the pipe section between the cut-off valve 4 and the pump when the pump stops.

[0032] As a preferred solution of the utility model, the height difference between the lowest point of the slope pipeline 3 and the horizontal pipeline 2 is not less than the diameter of the pump inlet pipeline 1.

[0033] As a preferred solution of the utility model, the pump inlet pipe 1 and the horizontal pipe 2 are connected by a 90° elbow.

[0034] As a preferred embodiment of the utility model, the horizontal pipe 2 and the sloped pipe 3 are connected through a 60° elbow, an inclined straight pipe and a 55°-57° elbow. One end of the 60° elbow is connected to the horizontal pipe 2, and the other end is connected upward to an inclined straight pipe with a length of not less than 300 mm. Then the inclined straight pipe is connected to the sloped pipe 3 through a 55°-57° elbow.

[0035] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A vertical liquid storage tank pump inlet pipeline structure, characterized in that: It includes a pump inlet pipe, a horizontal pipe and a slope pipe which are connected in sequence. The pump inlet pipe is arranged vertically downward along the pipe mouth of the storage tank. The horizontal pipe is connected to the lower end of the pump inlet pipe. The slope pipe is arranged above the horizontal pipe and the lower end is connected to the horizontal pipe. A cut-off valve is provided on the slope pipe. It also includes a capillary pipe. The upper end of the capillary pipe is connected to the storage tank, and the lower end of the capillary pipe extends to the inner bottom of the horizontal pipe.

2. A vertical liquid storage tank pump inlet pipeline structure according to claim 1, characterized in that: The lower end of the capillary channel is provided with an oblique cut of 30°-60°.

3. The inlet pipeline structure of a vertical liquid storage tank pump according to claim 1 is characterized in that: The capillary channel comprises The upper capillary pipe is connected to the storage tank; The lower capillary pipe is connected to the horizontal pipe; A horizontal capillary channel connecting the upper capillary channel and the lower capillary channel; The horizontal capillary channel is arranged in an inclined manner, and the higher end of the horizontal capillary channel is connected to the upper capillary channel.

4. The inlet pipeline structure of a vertical liquid storage tank pump according to claim 3 is characterized in that: The slope of the horizontal capillary channel is 3°-5°.

5. A vertical liquid storage tank pump inlet pipeline structure according to any one of claims 1 to 4, characterized in that: The slope of the slope pipeline is 3°-5°.

6. The inlet pipeline structure of a vertical liquid storage tank pump according to claim 5, characterized in that: A drainage pipe is provided at the lowest point of the slope pipe located at the rear side of the cut-off valve.

7. A vertical liquid storage tank pump inlet pipeline structure according to any one of claims 1 to 4, characterized in that: The height difference between the lowest point of the slope pipeline and the horizontal pipeline is not less than the diameter of the pump inlet pipeline.

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