A tank unloading liquid collecting device
By adding a liquid collection pipe and related auxiliary components to the inlet pipe of the tank truck unloading pump, the problem of easy cavitation in the inlet pipe of the tank truck unloading pump was solved, achieving a stable liquid supply and continuous normal operation of the equipment, reducing the failure rate and maintenance costs, and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2026-06-26
AI Technical Summary
In existing technologies, the inlet pipeline of the tank truck unloading pump is prone to cavitation, which prevents the blended oil components from being completely unloaded, resulting in material waste and equipment wear, and increasing production costs and failure rates.
A liquid collection pipe, a vent pipe, and a sewage discharge pipe are added to the inlet pipe of the unloading pump. The liquid collection pipe is designed with a smooth inner wall and wrapped with an insulation layer. The height of the vent pipe is the same as the top of the tank truck. The sewage discharge pipe is located at the bottom of the liquid collection pipe. The valve is made of stainless steel to prevent air blockage and material waste.
It effectively prevents the unloading pump inlet pipeline from cavitating, reduces equipment failures, lowers maintenance frequency and costs, improves the economy and reliability of the unloading process, and prevents material waste and environmental pollution.
Smart Images
Figure CN224411411U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tank-type blended oil technology, specifically a tank unloading and liquid collection device. Background Technology
[0002] In the production process of tank-type blended oil, tank trucks, as the main transport carriers of blended oil components, need to be accurately delivered to the blended oil storage tanks via unloading pumps. This step is fundamental to ensuring the smooth operation of subsequent blending processes. However, under existing technical solutions, the inlet pipeline of the unloading pump generally faces the technical challenge of being easily emptied.
[0003] Specifically, when tank trucks deliver blended oil components to storage tanks, as the liquid level in the tank truck gradually decreases, or due to unstable fluid flow in the pipeline, negative pressure can easily occur at the inlet of the unloading pump, leading to pipeline cavitation. This situation not only prevents the blended oil components in the tank truck from being completely unloaded, resulting in significant material waste, but also severely impacts the operation of the unloading pump—vulnerable pump components (such as impellers and seals) will wear rapidly under dry friction conditions due to lack of liquid lubrication and cooling, directly causing a significant increase in equipment failure rate.
[0004] Frequent malfunctions not only require staff to perform multiple inspections and repairs, disrupting normal production, but also generate substantial unnecessary maintenance costs due to frequent replacement of spare parts and continuous investment in labor. Over the long term, this significantly increases production costs and reduces efficiency. To address these issues, this invention proposes a liquid collection device for unloading storage tanks. By adding a liquid collection pipe and related auxiliary components to the unloading pump inlet pipeline, it effectively solves problems such as pump inlet pipeline cavitation, incomplete material unloading, and easy equipment damage. Utility Model Content
[0005] The purpose of this invention is to provide a liquid collection device for unloading from a storage tank, so as to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a tank unloading liquid collection device, comprising an unloading pump, an inlet pipe connected internally to the unloading pump, a collection pipe connected between the inlet end of the unloading pump and the inlet pipe, the inlet pipe for receiving blended oil components from the tank truck, a vent pipe connected to one end of the top of the collection pipe, a vent outlet at the other end of the vent pipe, the height of the vent outlet being the same as the top height of the tank truck, a vent valve installed inside the vent pipe, a drain pipe installed at the end of the collection pipe away from the vent pipe, a drain valve installed inside the drain pipe, and a pump outlet pipe connected to the other end of the unloading pump.
[0007] Preferably, the diameter of the liquid collecting pipe is larger than the diameter of the pump inlet pipe to enhance the liquid collecting effect, and the inner wall of the liquid collecting pipe has a smooth surface to reduce the flow resistance of the blending oil components in the pipe.
[0008] Preferably, the connection point between the vent pipe and the liquid collecting pipe is located at the highest point of the liquid collecting pipe, and the connection end between the vent pipe and the liquid collecting pipe is fixed by welding.
[0009] Preferably, the connection point between the drain pipe and the collection pipe is located at the lowest point of the bottom of the collection pipe, the connection end between the drain pipe and the collection pipe is connected by a flange, and a filter device can be detachably connected to the drain port at the bottom of the drain pipe.
[0010] Preferably, both the vent valve and the drain valve are ball valves, wherein the nominal diameter of the vent valve is adapted to the diameter of the vent pipe, and the nominal diameter of the drain valve is adapted to the diameter of the drain pipe, and the valve body of both the vent valve and the drain valve is made of stainless steel to adapt to the corrosive environment of the blending oil components.
[0011] Preferably, the connection between the pump inlet pipe and the collecting pipe, and the connection between the collecting pipe and the unloading pump inlet, are all made by flange connection, and an oil-resistant rubber gasket is provided at the flange connection to prevent leakage of the blending oil components.
[0012] Preferably, the outer wall of the liquid collecting pipe is wrapped with a heat insulation layer made of rock wool or polyurethane, with a thickness of 30-50mm, to reduce the temperature loss of the blended oil components in the liquid collecting pipe.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. The liquid collection device for tank unloading utilizes a collection pipe, a core optimized component of the tank unloading pipeline system. Its specific structural design allows it to store a certain amount of blended oil components, forming a stable liquid buffer space. During the process of transporting the blended oil components from the tanker to the unloading pump via the pump inlet pipeline, if the liquid level in the tanker drops, causing fluctuations in the liquid supply, or if there are instantaneous changes in flow rate within the pipeline, the blended oil components stored in the collection pipe can promptly replenish the unloading pump inlet. This fundamentally avoids the cavitation problem caused by insufficient liquid supply in the pump inlet pipeline in traditional processes, directly ensuring the continuous and normal operation of the unloading pump. On the one hand, it effectively prevents damage to vulnerable pump components due to dry friction caused by cavitation, significantly reducing the equipment failure rate. On the other hand, because the unloading pump operates more stably, it reduces the need for frequent maintenance due to malfunctions, not only reducing the frequency of spare parts replacement but also saving time and costs associated with manual maintenance. This significantly reduces unnecessary maintenance expenses and improves the economy and reliability of the entire unloading process.
[0015] 2. The liquid collection device for unloading the storage tank, with its vent pipe and vent valve, can purge the gas in the collection pipe and pump inlet pipe, preventing gas blockage from affecting the unloading process. At the same time, the vent port is at the same height as the top of the tank truck, which can avoid liquid discharge causing waste and pollution. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model.
[0017] In the diagram: 1. Vent pipe; 2. Vent valve; 3. Liquid collection pipe; 4. Pump inlet pipe; 5. Sewage valve; 6. Sewage pipe; 7. Unloading pump; 8. Pump outlet pipe. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Please see Figure 1 This utility model provides a technical solution: a tank unloading liquid collection device, including an unloading pump 7, an inlet pipe 4 connected inside the unloading pump 7, a collection pipe 3 connected between the inlet end of the unloading pump 7 and the inlet pipe, the inlet pipe 4 being used to receive blended oil components from the tank truck, a vent pipe 1 connected to one end of the top of the collection pipe 3, a vent port opened at the other end of the vent pipe 1, the height of the vent port being the same as the top height of the tank truck, a vent valve 2 installed inside the vent pipe 1, a drain pipe 6 installed at the end of the collection pipe 3 away from the vent pipe 1, a drain valve 5 installed inside the drain pipe 6, and a pump outlet pipe 8 connected to the other end of the unloading pump 7.
[0020] The diameter of the liquid collecting pipe 3 is larger than that of the pump inlet pipe 4 to enhance the liquid collecting effect. The inner wall of the liquid collecting pipe 3 has a smooth surface to reduce the flow resistance of the blending oil components in the pipe.
[0021] The connection point between the vent pipe 1 and the liquid collecting pipe 3 is located at the highest point of the liquid collecting pipe 3, and the connection end between the vent pipe 1 and the liquid collecting pipe 3 is fixed by welding.
[0022] The connection point between the drain pipe 6 and the collection pipe 3 is located at the lowest point of the bottom of the collection pipe 3. The connection end between the drain pipe 6 and the collection pipe 3 is connected by a flange. The drain port at the bottom of the drain pipe 6 can be detachably connected to a filter device.
[0023] Both the vent valve 2 and the drain valve 5 are ball valves. The nominal diameter of the vent valve 2 is matched with the diameter of the vent pipe 1, and the nominal diameter of the drain valve 5 is matched with the diameter of the drain pipe 6. The valve bodies of both the vent valve 2 and the drain valve 5 are made of stainless steel to adapt to the corrosive environment of the blending oil components.
[0024] The connection between the pump inlet pipe 4 and the liquid collection pipe 3, and the connection between the liquid collection pipe 3 and the inlet of the unloading pump 7, are all made by flange connection, and oil-resistant rubber gaskets are installed at the flange connection to prevent leakage of the blending oil components.
[0025] The outer wall of the liquid collection pipe 3 is wrapped with an insulation layer made of rock wool or polyurethane, with a thickness of 30-50mm, to reduce the temperature loss of the blending oil components in the liquid collection pipe 3.
[0026] Working principle: First, complete the preliminary preparations to ensure that the connection between the tank truck and the pump inlet pipeline 4 is tight and reliable, check the status of each valve, and ensure that the vent valve 2 and the drain valve 5 are in the closed state.
[0027] Subsequently, the vent valve 2 is opened. Since air may remain in the collection pipe 3 and pump inlet pipe 4 in their initial state, failure to expel this air can lead to cavitation at the inlet of the unloading pump 7, affecting its normal operation. After opening the vent valve 2, the blended oil components in the tank truck will gradually enter the pump inlet pipe 4 and flow towards the collection pipe 3 under their own pressure or gravity. During this process, the gas in the pipes is compressed by the blended oil components and discharged through the vent pipe 1. It is worth noting that the vent outlet height of the vent pipe 1 is consistent with the top height of the tank truck. This design effectively prevents the blended oil components from being discharged along with the gas during the venting process, reducing material waste and avoiding environmental pollution. Operators can judge whether the gas has been completely vented by observing the vent outlet. When no more bubbles emerge from the vent outlet and a small amount of blended oil components are about to overflow, it indicates that the gas in the pump inlet pipe 4 and collection pipe 3 has been completely vented.
[0028] Next, the vent valve 2 is closed. At this time, the blended oil components in the tanker truck continue to flow into the collection pipe 3 through the pump inlet pipe 4. The collection pipe 3 can store a certain amount of blended oil components, providing a stable liquid supply for the unloading pump 7 and effectively preventing the unloading pump 7 inlet pipe from running dry. After a brief stay in the collection pipe 3, the blended oil components enter the unloading pump 7, and under the power of the unloading pump 7, are transported to the blended oil storage tank through the pump outlet pipe 8, completing the unloading process.
[0029] During long-term use, small amounts of dirt and impurities contained in the blended oil components will accumulate at the bottom of the collection pipe 3. Therefore, it is necessary to regularly drain the collection pipe 3. During drainage, first stop the unloading operation, ensure the pressure inside the collection pipe 3 is within a safe range, then open the drain valve 5. The dirt and impurities deposited in the collection pipe 3 will be discharged through the drain pipe 6 under gravity. After drainage is complete, close the drain valve 5 to ensure the normal operation of subsequent unloading operations.
[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. A tank unloading collection device comprising an unloading pump (7), characterized in that: The unloading pump (7) is internally connected to a pump inlet pipe (4). A collection pipe (3) is connected between the inlet end of the unloading pump (7) and the pump inlet pipe. The pump inlet pipe (4) is used to receive the blended oil components from the tank truck. One end of the top of the collection pipe (3) is connected to a vent pipe (1). The other end of the vent pipe (1) is provided with a vent port. The height of the vent port is the same as the height of the top of the tank truck. A vent valve (2) is provided inside the vent pipe (1). A drain pipe (6) is provided at the end of the collection pipe (3) away from the vent pipe (1). A drain valve (5) is provided inside the drain pipe (6). The other end of the unloading pump (7) is connected to a pump outlet pipe (8).
2. A tank unloading liquid collection device according to claim 1, characterized in that: The diameter of the liquid collecting pipe (3) is larger than the diameter of the pump inlet pipe (4).
3. A tank unloading liquid collection device according to claim 1, characterized in that: The connection point between the vent pipe (1) and the liquid collecting pipe (3) is located at the highest point of the top of the liquid collecting pipe (3), and the connection end between the vent pipe (1) and the liquid collecting pipe (3) is fixed by welding.
4. A tank unloading liquid collection device according to claim 1, characterized in that: The connection point between the drain pipe (6) and the collection pipe (3) is located at the lowest point of the bottom of the collection pipe (3). The connection end between the drain pipe (6) and the collection pipe (3) is connected by a flange. The drain outlet at the bottom of the drain pipe (6) can be detachably connected to a filter device.
5. A tank unloading liquid collection device according to claim 1, characterized in that: Both the vent valve (2) and the drain valve (5) are ball valves. The nominal diameter of the vent valve (2) is matched with the diameter of the vent pipe (1), and the nominal diameter of the drain valve (5) is matched with the diameter of the drain pipe (6). The valve bodies of the vent valve (2) and the drain valve (5) are made of stainless steel.
6. A tank unloading liquid collection device according to claim 1, characterized in that: The connection between the pump inlet pipe (4) and the collection pipe (3), and the connection between the collection pipe (3) and the inlet of the unloading pump (7) are all made by flange connection.
7. A tank unloading liquid collection device according to claim 1, characterized in that: The outer wall of the liquid collection pipe (3) is wrapped with a heat insulation layer, which is made of rock wool or polyurethane and has a thickness of 30-50mm.