Liquefied petroleum gas filling process weighing device

Abstract

The application discloses a liquefied petroleum gas filling process weighing device, which comprises a conveying tank unit, a filling pipeline unit, a steel bottle bearing unit and a recovery unit. The conveying tank unit comprises a conveying tank, a first weighing device arranged at the bottom of the conveying tank and a feeding pipeline connected with the conveying tank. The filling pipeline unit comprises a filling pipeline connected with the conveying tank, a control valve installed on the filling pipeline and a joint connected with the end of the filling pipeline. The steel bottle bearing unit comprises a filling platform and a second weighing device installed on the filling platform and used for weighing the steel bottle. The recovery unit comprises a recovery tank connected with the filling pipeline through a branch pipe, a vacuum pump installed on the branch pipe and a one-way exhaust valve.

Description

Technical Field

[0001] This utility model relates to the field of weighing device technology, specifically to a weighing device for the filling process of liquefied petroleum gas. Background Technology

[0002] Liquefied petroleum gas (LPG), as a clean and efficient energy source, has wide applications in both industrial production and residential life. In the LPG supply process, filling is a crucial step; the accuracy of the filling volume directly affects the economic interests of both the supplier and the consumer, and is also closely linked to safety issues during use.

[0003] Currently, most liquefied petroleum gas (LPG) filling processes use weighing to control the filling volume. Traditional filling weighing devices use a weigher on the cylinder to calculate the filling volume, but this method has low accuracy. To address this, a new method has emerged that uses a temporary LPG storage tank, and then fills the cylinder through a filling pipeline. Weighers are installed at the bottom of the storage tank and at the cylinder's placement point. By comparing the weight loss in the storage tank with the weight gain in the cylinder, the filling process can be controlled.

[0004] However, this traditional device has many problems in practical applications. For example, after filling, some liquefied petroleum gas (LPG) remains inside the filling pipeline. This residual LPG can cause the weight loss of the delivery tank to be greater than the weight gain of the cylinder, resulting in weighing errors. Although some devices attempt to reduce the amount of residual gas by shortening the filling pipeline, this method limits the length of the filling pipeline, making connection with the cylinder inconvenient, and lacks an effective mechanism for actively removing residual gas, so LPG always remains in the filling pipeline. Utility Model Content

[0005] The present invention aims to provide a weighing device for the liquefied petroleum gas filling process, which solves the problem that residual liquefied petroleum gas in the filling pipeline in the prior art leads to a decrease in measurement accuracy.

[0006] To address the above problems, this application provides the following technical solution: A weighing device for liquefied petroleum gas filling process, comprising: The conveying tank unit includes a conveying tank, a first weighing device disposed at the bottom of the conveying tank, and a feed pipe connected to the conveying tank; The filling pipeline unit consists of a filling pipeline connected to the delivery tank, a control valve installed on the filling pipeline, and a connector connected to the end of the filling pipeline. The cylinder carrying unit includes a filling platform and a second weighing device installed on the filling platform for weighing the cylinder; The recovery unit includes a recovery tank connected to the filling pipeline via a branch pipe, a vacuum pump installed on the branch pipe, and a one-way exhaust valve.

[0007] The working principle and beneficial effects of this utility model: The delivery tank unit is used to temporarily store liquefied petroleum gas and monitor its weight changes in real time through a first weighing device; the filling pipeline unit is responsible for delivering liquefied petroleum gas from the delivery tank to the cylinder and adjusting the filling flow rate through a control valve; the cylinder is supported by the filling platform and the cylinder weight gain is accurately measured using a second weighing device; the recovery unit uses a vacuum pump and a one-way exhaust valve to pump the residual liquefied petroleum gas in the filling pipeline to the recovery tank to avoid residual gas affecting the weighing accuracy.

[0008] Compared to traditional single-cylinder weighing methods, this device improves the accuracy of filling volume measurement by comparing the weight reduction of the conveying tank and the weight increase of the cylinder. Simultaneously, the addition of a recovery unit specifically addresses the weighing deviation problem caused by residual gas in the filling pipeline in traditional devices, balancing measurement accuracy and operational feasibility.

[0009] As a preferred option, the filling pipeline is a metal corrugated pipe.

[0010] Metal bellows are flexible and extensible, which can meet the connection distance requirements of steel cylinders of different specifications, maintain the structural strength and sealing of the pipeline, and reduce ineffective volume and residual gas through the compact design of the bellows.

[0011] As a preferred embodiment, a reflux pipeline with a one-way reflux valve is provided between the recovery tank and the delivery tank, and the reflux pipeline is also equipped with a delivery pump. When the residual gas collected in the recovery tank reaches a certain amount, the delivery pump starts and pressurizes the recovered liquefied petroleum gas and delivers it back to the delivery tank through the reflux pipeline. The one-way reflux valve ensures that the gas can only flow from the recovery tank to the delivery tank, preventing high-pressure gas in the delivery tank from flowing back into the recovery tank.

[0012] As a preferred embodiment, the filling platform is provided with a positioning groove for positioning the cylinder, and the second weighing device is disposed in the positioning groove.

[0013] Preferably, the control valve is located near the delivery tank. Attached Figure Description Figure 1 A schematic diagram of the structure of a weighing device for the existing liquefied petroleum gas filling process; Figure 2 This is a schematic diagram of the structure of a weighing device for the filling process of liquefied petroleum gas according to this application.

[0014] The reference numerals in the accompanying drawings include: 1. Filling platform; 2. First weighing device; 3. Feeding pipe; 4. Control valve; 5. Return pipe; 6. Conveying tank; 7. Filling pipe; 8. Connector; 9. Cylinder; 10. One-way exhaust valve; 11. Branch pipe; 12. Recovery tank; 13. Second weighing device; 14. One-way return valve; 15. Vacuum pump; 16. Conveying pump. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method: like Figure 2 As shown, a weighing device for the liquefied petroleum gas filling process consists of the following units: The conveying tank unit includes a conveying tank 6 for temporary storage of liquefied petroleum gas, a first weighing device 2 located at the bottom of the conveying tank 6, and a feed pipe 3 connected to the top of the conveying tank 6.

[0016] The filling pipeline unit consists of a filling pipeline 7 connected to the bottom outlet of the conveying tank 6, a control valve 4 installed on the filling pipeline 7 and close to the side of the conveying tank 6, and a connector 8 connected to the end of the filling pipeline 7. Preferably, the filling pipeline 7 is made of metal corrugated pipe, which ensures the flexible connection characteristics of the pipeline and reduces the adhesion and residue of liquefied gas on the pipe wall.

[0017] The cylinder support unit includes a filling platform 1 for placing the cylinder 9 and a second weighing device 13 installed on the filling platform 1. Preferably, the surface of the filling platform 1 is provided with a positioning groove that matches the bottom contour of the cylinder 9, and the second weighing device 13 is integrated into the center of the bottom of the positioning groove to ensure that the center of gravity of the cylinder 9 is consistent with the weighing center each time it is placed.

[0018] The recovery unit consists of a recovery tank 12, a branch pipe 11 connecting the filling pipeline 7 and the recovery tank 12, and a vacuum pump 15 and a one-way exhaust valve 10 installed on the branch pipe 11. A return pipeline 5 is also provided between the recovery tank 12 and the delivery tank 6. A one-way return valve 14 and a delivery pump 16 are installed sequentially on the return pipeline 5 to achieve the recycling of the recovered gas. The first weighing device 2 and the second weighing device 13 use Zemic HM9B-C3-3000kg-6B type weighing sensors.

[0019] Liquefied petroleum gas is supplied to the conveying tank 6 through the feed pipeline 3 to the preset liquid level. The steel cylinder 9 to be filled is placed in the positioning slot of the filling platform 1, so that the interface of the steel cylinder 9 is aligned and connected with the quick connector 8 at the end of the filling pipeline 7. At this time, the first weighing device 2 records the initial weight of the conveying tank 6, and the second weighing device 13 records the initial weight of the empty steel cylinder 9.

[0020] When control valve 4 is opened, liquefied petroleum gas flows to cylinder 9 through filling pipeline 7 under the pressure difference between delivery tank 6 and cylinder 9. During the filling process, the first weighing device 2 monitors the weight loss data of delivery tank 6 in real time, and the second weighing device 13 records the weight gain data of cylinder 9 simultaneously, forming a dynamic comparison between the two.

[0021] When the filling volume reaches the preset value, the control valve 4 is closed, and then the vacuum pump 15 of the recovery unit is started and the one-way exhaust valve 10 is opened. The residual liquefied petroleum gas in the filling pipeline 7 is pumped to the recovery tank 12 for storage. The compact structure of the metal bellows and the special treatment of the inner wall, combined with the negative pressure of the vacuum pump 15, can significantly reduce the amount of residual gas in the pipeline.

[0022] When the liquefied petroleum gas in the recovery tank 12 reaches the set level, the delivery pump 16 on the return pipeline 5 is started, and the one-way return valve 14 is opened to pressurize and deliver the recovered gas back to the delivery tank 6 for recycling, thus avoiding energy waste.

[0023] It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A weighing device for the liquefied petroleum gas filling process, comprising: The conveying tank unit includes a conveying tank, a first weighing device disposed at the bottom of the conveying tank, and a feed pipe connected to the conveying tank; The filling pipeline unit consists of a filling pipeline connected to the delivery tank, a control valve installed on the filling pipeline, and a connector connected to the end of the filling pipeline. The cylinder carrying unit includes a filling platform and a second weighing device installed on the filling platform for weighing the cylinder; The recovery unit includes a recovery tank connected to the filling pipeline via a branch pipe, a vacuum pump installed on the branch pipe, and a one-way exhaust valve.

2. The weighing device for the liquefied petroleum gas filling process according to claim 1, characterized in that: The filling pipeline is a metal corrugated pipe.

3. The weighing device for the liquefied petroleum gas filling process according to claim 2, characterized in that: A reflux pipeline with a one-way reflux valve is provided between the recovery tank and the conveying tank, and the reflux pipeline is also equipped with a conveying pump.

4. The weighing device for the liquefied petroleum gas filling process according to claim 3, characterized in that: The filling platform is provided with a positioning groove for positioning the steel cylinder, and the second weighing device is set in the positioning groove.

5. The weighing device for the liquefied petroleum gas filling process according to claim 4, characterized in that: The control valve is located near the delivery tank.

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