Device for emptying residual solution in a line

Abstract

The utility model discloses a kind of emptying device of residual solution in pipeline, including DPF tank body, differential pressure sensor and electric control piston type gas holder;The DPF tank body is connected with differential pressure sensor respectively by two pipelines, differential pressure sensor and electric control piston type gas holder are connected by first exhaust pipe and second exhaust pipe, electric control piston type gas holder and first exhaust pipe, second exhaust pipe are connected by three-way joint, the emptying of urea solution in pipeline is realized, and simple structure, the purposes of low energy consumption and low cost.

Description

Technical Field

[0001] This utility model belongs to the field of diesel engine exhaust gas treatment technology, specifically relating to a device for venting residual solution in pipelines. Background Technology

[0002] In construction machinery, such as mining machinery, with the increasing stringent emission standards, adding urea is the most important preparatory step for each work shift. The core function of urea is to convert nitrogen oxides in exhaust gases into harmless nitrogen and water vapor, thereby reducing pollutant emissions. In current diesel engines that meet the China IV and higher emission standards, the diesel engine aftertreatment system includes a crucial component: the diesel particulate filter (DPF). The DPF filter element is a vital link in capturing large particulate pollutants in the exhaust gas. Therefore, detecting the degree of clogging of the DPF filter element is particularly important, and this is usually checked using a differential pressure sensor. Currently, some construction machinery has residual urea solution in the pipelines of the differential pressure sensors before and after the DPF after a power outage, or even after the urea solution in the pipeline is drained by gravity, some residue remains. This residual urea, after crystallization, can significantly affect the detection of the differential pressure sensor, thus affecting the DPF filter clogging test results and the effectiveness of the diesel engine's exhaust aftertreatment.

[0003] Patent CN 206592184 U discloses a pneumatically assisted urea injection device with venting capability, comprising a urea solution pipeline and an air pipeline. The urea solution pipeline includes a urea tank, an inlet pipeline, a urea pump, and an outlet pipeline connected in sequence. The urea tank contains urea solution. The air pipeline includes a compressed air source, an inlet pipeline, an air pressure regulating valve, and an outlet pipeline connected in sequence. It also includes a multi-way reversing device, a urea nozzle, and a return branch. The other end of the outlet pipeline is connected to one end of the multi-way reversing device, and the other end of the multi-way reversing device is connected to the urea nozzle. The other end of the outlet pipeline is connected to the multi-way reversing device. A return solenoid valve is provided on the return branch. One end is connected to the liquid outlet pipeline, and the other end of the return pipeline is connected to the urea tank. The multi-way reversing device is a multi-way valve with at least four passages. After the urea injection device is used up, the multi-way reversing device can switch the passages to ensure that the air outlet pipeline and the liquid outlet pipeline are connected. Under the action of air, the residual urea solution in the liquid outlet pipeline is returned to the urea tank through the return pipeline, so that the urea solution is recycled and reused, avoiding the problem of urea solution being discharged into the exhaust pipe. The structure and control are relatively complex. It is necessary to control the opening and closing of the return solenoid valve and the reversing of the multi-way reversing device to complete the emptying of the urea solution in the pipeline, which increases energy consumption and cost. Utility Model Content

[0004] To address the existing technical problems, this utility model provides a device for draining residual solution in pipelines, thereby achieving the drainage of urea solution in pipelines. It also features a simple structure, low energy consumption, and low cost.

[0005] The technical solution of this utility model is: a device for venting residual solution in a pipeline, comprising a DPF tank, a differential pressure sensor, and an electrically controlled piston-type gas storage tank; the DPF tank is connected to the differential pressure sensor through two pipelines respectively, the differential pressure sensor and the electrically controlled piston-type gas storage tank are connected through a first exhaust pipe and a second exhaust pipe, and the electrically controlled piston-type gas storage tank is connected to the first exhaust pipe and the second exhaust pipe through a T-joint.

[0006] Furthermore, the power supply device of the electrically controlled piston-type gas storage tank and the DPF tank is the same. When the electrically controlled piston-type gas storage tank is powered on, the piston inside the electrically controlled piston-type gas storage tank tightens, and the gas generated in the DPF tank is stored in the electrically controlled piston-type gas storage tank. When the electrically controlled piston-type gas storage tank is de-powered, the piston inside the electrically controlled piston-type gas storage tank releases, and the gas stored in the electrically controlled piston-type gas storage tank is pushed into the pipeline.

[0007] Furthermore, the air inlet of the DPF tank is connected to a differential pressure sensor via a first pressure measuring tube, and the air outlet of the DPF tank is connected to a differential pressure sensor via a second pressure measuring tube.

[0008] When the residual solution venting device in the pipeline of this utility model is working, the electronically controlled piston-type gas storage tank and the DPF tank are powered by the vehicle battery of the diesel engine of the construction machinery. When the vehicle is powered on, the solenoid valve in the electronically controlled piston-type gas storage tank is energized, causing the piston in the electronically controlled piston-type gas storage tank to tighten. At this time, the vehicle is running normally, and the gas generated in the DPF tank enters the electronically controlled piston-type gas storage tank through the first pressure measuring pipe, the second pressure measuring pipe, the first exhaust pipe, and the second exhaust pipe. When the vehicle is powered off, the solenoid valve in the electronically controlled piston-type gas storage tank is de-energized, causing the piston to release and pushing the gas stored in the electronically controlled piston-type gas storage tank into the first exhaust pipe, the second exhaust pipe, the first pressure measuring pipe, and the second pressure measuring pipe, thereby venting the residual urea solution in the pipeline.

[0009] By adopting the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0010] (1) By connecting the electronically controlled piston-type gas storage tank, the first exhaust pipe, the second exhaust pipe and the differential pressure sensor, the DPF tank works normally and stores some gas in the electronically controlled piston-type gas storage tank when the vehicle is powered on. When the vehicle is powered off, the gas stored in the electronically controlled piston-type gas storage tank is pushed out, emptying the residual urea solution in the first pressure measuring pipe and the second pressure measuring pipe. This significantly reduces the situation where the residual urea solution crystallizes in the pipeline and blocks the pipeline, thereby avoiding the failure of the differential pressure sensor, improving the reliability and service life of the DPF and after-treatment system, and reducing the maintenance frequency and cost.

[0011] (2) This utility model connects the electrically controlled piston-type gas storage tank and the first exhaust pipe and the second exhaust pipe through a three-way connector. When the whole machine is powered off, the urea in the pipeline is automatically emptied. There is no need to set up an additional electrical control system and corresponding pipeline conversion structure, such as solenoid valve and multi-way valve. The structure is simple, the logic control is simple, the energy consumption is low, and the cost is low. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram, 1 is the DPF tank; 2 is the differential pressure sensor; 3 is the electrically controlled piston-type gas storage tank; 4 is the first exhaust pipe; 5 is the second exhaust pipe; 6 is the tee connector; 7 is the first pressure measuring tube; and 8 is the second pressure measuring tube. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Example 1

[0016] Reference Figure 1 A device for venting residual solution in a pipeline includes a DPF tank 1, a differential pressure sensor 2, and an electrically controlled piston-type gas storage tank 3. The DPF tank 1 is connected to the differential pressure sensor 2 via two pipelines. The differential pressure sensor 2 and the electrically controlled piston-type gas storage tank 3 are connected via a first exhaust pipe 4 and a second exhaust pipe 5. The electrically controlled piston-type gas storage tank 3 is connected to the first exhaust pipe 4 and the second exhaust pipe 5 via a tee connector 6.

[0017] The electrically controlled piston-type gas storage tank 3 forms a passage with the differential pressure sensor 2 through the first exhaust pipe 4, the second exhaust pipe 5, and the three-way connector 6. When the DPF tank 1 and the electrically controlled piston-type gas storage tank 3 are powered on, the gas generated in the DPF tank 1 can enter the electrically controlled piston-type gas storage tank 3 through the first exhaust pipe 4 and the second exhaust pipe 5. When the DPF tank 1 and the electrically controlled piston-type gas storage tank 3 are de-energized, the gas stored in the electrically controlled piston-type gas storage tank 3 is pushed back to the first pressure measuring pipe 7, the second pressure measuring pipe 8, and the DPF tank 1 through the three-way connector 6, the first exhaust pipe 4, and the second exhaust pipe 5. It can automatically push the gas in the pipeline back while the power is off without the need for control by a solenoid valve or change of the connection direction of the electrically controlled pipeline, thereby emptying the urea solution in the pipeline.

[0018] Furthermore, the power supply device for the electrically controlled piston-type gas storage tank 3 and the DPF tank 1 is the same. When the electrically controlled piston-type gas storage tank 3 is energized, the piston inside the tank tightens, and the gas generated in the DPF tank 1 is stored in the tank. When the power to the electrically controlled piston-type gas storage tank 3 is cut off, the piston releases, and the gas stored in the tank is pushed into the pipeline. This achieves automatic reverse pushing of gas in the pipeline even when the power is cut off.

[0019] Furthermore, the air inlet of the DPF tank 1 is connected to the differential pressure sensor 2 via the first pressure measuring tube 7, and the air outlet of the DPF tank 1 is connected to the differential pressure sensor 2 via the second pressure measuring tube 8.

[0020] When the residual solution venting device in the pipeline of this utility model is working, the electronically controlled piston-type gas storage tank 3 and the DPF tank 1 are powered by the vehicle battery of the diesel engine of the construction machinery. When the vehicle is powered on, the solenoid valve in the electronically controlled piston-type gas storage tank 3 is energized, causing the piston in the electronically controlled piston-type gas storage tank 3 to tighten. At this time, the vehicle is running normally, and the gas generated in the DPF tank 1 enters the electronically controlled piston-type gas storage tank 3 through the first pressure measuring pipe 7, the second pressure measuring pipe 8, the first exhaust pipe 4, and the second exhaust pipe 5 for storage. When the vehicle is powered off, the solenoid valve in the electronically controlled piston-type gas storage tank 3 is de-energized, causing the piston to release and pushing the gas stored in the electronically controlled piston-type gas storage tank 3 into the first exhaust pipe 4, the second exhaust pipe 5, the first pressure measuring pipe 7, and the second pressure measuring pipe 8, thereby venting the residual urea solution in the pipeline.

Claims

1. A device for draining residual solution in a pipeline, characterized in that: It includes a DPF tank (1), a differential pressure sensor (2), and an electronically controlled piston-type gas storage tank (3); the DPF tank (1) is connected to the differential pressure sensor (2) through two pipelines respectively, the differential pressure sensor (2) and the electronically controlled piston-type gas storage tank (3) are connected through a first exhaust pipe (4) and a second exhaust pipe (5), and the electronically controlled piston-type gas storage tank (3) is connected to the first exhaust pipe (4) and the second exhaust pipe (5) through a three-way connector (6).

2. The device for draining residual solution in a pipeline according to claim 1, characterized in that: The power supply device of the electrically controlled piston-type gas storage tank (3) and the DPF tank (1) is the same. When the electrically controlled piston-type gas storage tank (3) is powered, the piston in the electrically controlled piston-type gas storage tank (3) tightens, and the gas generated in the DPF tank (1) is stored in the electrically controlled piston-type gas storage tank (3). When the electrically controlled piston-type gas storage tank (3) is de-powered, the piston in the electrically controlled piston-type gas storage tank (3) is released, and the gas stored in the electrically controlled piston-type gas storage tank (3) is pushed into the pipeline.

3. A device for draining residual solution in a pipeline according to claim 1 or 2, characterized in that: The air inlet of the DPF tank (1) is connected to the differential pressure sensor (2) via the first pressure measuring tube (7), and the air outlet of the DPF tank (1) is connected to the differential pressure sensor (2) via the second pressure measuring tube (8).

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