Automatic purging device for sampling pipeline

Abstract

The utility model relates to the technical field of anti-blocking of sampling pipelines, in particular to an automatic purging device for a sampling pipeline. Comprising an electromagnetic valve and a sampling pipeline, the electromagnetic valve comprises a valve body, a first cavity, a second cavity and a third cavity are formed in the valve body, a valve rod assembly is arranged in the valve body, and a valve element is arranged on the portion, located among the first cavity, the second cavity and the third cavity, of the outer wall of the valve rod assembly. The second cavity is communicated with the third cavity, and the first cavity is communicated with the third cavity when the electromagnetic valve is in a power-on state. When the set time is up and the electromagnetic valve is powered on, the first cavity is communicated with the third cavity, the sampling pipeline is communicated with the purging branch pipe and is connected with the plasma fan through the purging main pipe; plasma wind is blown out to blow a sampling pipeline, an instrument pipeline on the sampling pipeline and the like, regular blowing is carried out every day, the instrument pipeline is guaranteed to be smooth, and the measurement accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling pipeline anti-blocking, in particular to an automatic sampling pipeline purge device, which is suitable for clearing dust, particles and slurry blockage in the sampling pipeline of a thermal power plant. Background Art

[0002] Most of the sampling media in the thermal control sampling pipelines of thermal power plants are coal powder, dust, slurry, and water. After a period of use, the elbows and horizontal parts of the pipelines are prone to blockage or water accumulation, which can easily cause parameter jumps and inaccurate measurements, affecting the judgment of the operating personnel; after the pipelines are blocked or water accumulates, maintenance personnel need to use external gas source pipelines for purge. After some sampling pipelines are blocked, the sampling device can only be removed for cleaning, which cannot be handled when the unit is running, resulting in the inability of the operating personnel to monitor; after long-term blockage, the instrument will be damaged by unidirectional pressure, and the instrument sampling tube will be blocked, and the instrument sampling tube needs to be replaced, which is a large workload. To this end, the present application proposes an automatic purge device to provide a new technical solution to solve the technical problems mentioned above. Utility Model Content

[0003] The purpose of the utility model is to provide an automatic purging device for a sampling pipeline of a thermal power plant to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: an automatic purging device for a sampling pipeline, comprising: a solenoid valve and a sampling pipeline, the solenoid valve comprising a valve body, the valve body is provided with a first cavity, a second cavity and a third cavity, the valve body is provided with a valve stem assembly, the outer wall of the valve stem assembly is provided with a valve core between the first cavity, the second cavity and the third cavity, when the solenoid valve is in a power-off state, the second cavity and the third cavity are connected, and when the solenoid valve is in a power-on state, the first cavity and the third cavity are connected. Under the premise that the above-mentioned valve body ensures the sealing performance, the space utilization rate is effectively improved through the multi-cavity layout. At the same time

[0005] Furthermore, one end of the first cavity is connected to a purge branch pipe, one end of the purge branch pipe is connected to a purge main pipe, one end of the second cavity is connected to a measuring pipeline, and one end of the third cavity is connected to a sampling pipeline.

[0006] Furthermore, a protective shell is provided on the outside of the solenoid valve, a protective door is provided on one side of the protective shell, and a transparent observation window is provided inside the protective door on one side of the solenoid valve.

[0007] Furthermore, when the solenoid valve is in a power-off state, the valve core seals the first cavity, and a gap is left between one side of the bottom of the valve core and the third cavity; when the solenoid valve is in a power-on state, the valve core descends, the valve core seals the second cavity, and a gap is left between one side of the top of the valve core and the third cavity.

[0008] Furthermore, there are a plurality of sampling pipelines, and a solenoid valve is disposed at one end of each of the sampling pipelines.

[0009] Furthermore, one end of the purge main pipe is connected to a plasma blower for providing pressure wind.

[0010] Furthermore, a limit block is provided at one end of the valve stem assembly. The limit block is made of plastic or hard rubber and is used to limit the movement of the valve stem assembly along the measuring pipeline.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model realizes the use of the automatic purging device of the sampling pipeline in a thermal power plant by setting the solenoid valve, the purging branch pipe, the measuring pipeline and the sampling pipeline. When the solenoid valve is in a power-off state, the second cavity and the third cavity are connected, so that the sampling pipeline and the measuring pipeline are connected, and normal sampling is realized. When the set time is reached and the solenoid valve is energized, the first cavity and the third cavity are connected, and the sampling pipeline and the purging branch pipe are connected. The plasma blower is connected through the purging main pipe to blow out plasma wind to purge the sampling pipeline and the instrument pipeline thereon. Regular purging is performed every day to ensure that the instrument pipeline is unobstructed, improve measurement accuracy, solve the problem that the industrial field pressure, differential pressure and liquid level transmitters are often inaccurate in monitoring due to the blockage of the sampling pipeline, and save manpower and material resources when unblocking the pipeline, which can greatly improve work efficiency.

[0013] 2. Since the sampling pipelines in thermal power plants are generally equipped with multiple groups according to sampling needs, and the sampling pipelines and measuring pipelines are generally set near the corners of the wall for easy detection and installation, rainwater accumulation and accidental collisions with handling equipment will seriously affect the service life of the solenoid valves and pipelines, especially the solenoid valves are greatly reduced in service life due to wind, rain, and sunlight exposure. The protective shell and protective door can effectively reduce wind, rain, and sunlight exposure. At the same time, the purge branch pipe, purge main pipe, measuring pipeline and sampling pipeline can be effectively set in the protective shell to prevent collisions with handling equipment and to shield from wind and rain.

[0014] 3. The purge main pipe and the purge branch pipe are used to connect multiple groups of purge equipment. At the same time, the solenoid valve and pipeline are protected by the protective shell to realize the joint management of multiple groups of purge pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the automatic purging device for sampling pipeline of the utility model;

[0016] Figure 2 A three-dimensional diagram of the automatic purging device for sampling pipelines of the utility model from another perspective;

[0017] Figure 3 This is a schematic diagram of the power-off state of the solenoid valve of the automatic purge device for the sampling pipeline of the utility model;

[0018] Figure 4 This is a schematic diagram of the energized state of the solenoid valve of the automatic purge device for the sampling pipeline of the utility model.

[0019] In the figure: 1-protective shell; 2-protective door; 3-solenoid valve; 301-valve body; 302-valve stem assembly; 303-valve core; 304-first cavity; 305-second cavity; 306-third cavity; 4-purge branch pipe; 5-purge main pipe; 6-measuring pipeline; 7-sampling pipeline. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] See also Figure 1-Figure 4 The utility model provides a technical solution: an automatic purging device for a sampling pipeline, comprising: a solenoid valve 3 and a sampling pipeline 7, the solenoid valve 3 comprising a valve body 301, a first cavity 304, a second cavity 305 and a third cavity 306 are arranged inside the valve body 301, a valve stem assembly 302 is arranged inside the valve body 301, a valve core 303 is arranged on the outer wall of the valve stem assembly 302 between the first cavity 304, the second cavity 305 and the third cavity 306, and the switching of the purging pipeline and the detection sampling pipeline is realized by the solenoid valve 3.

[0022] When the solenoid valve 3 is in the power-off state, the second cavity 305 and the third cavity 306 are interconnected, and when the solenoid valve 3 is in the power-on state, the first cavity 304 and the third cavity 306 are interconnected. When the solenoid valve 3 is in the power-off state, the valve core 303 seals the first cavity 304, and a gap is left between the bottom side of the valve core 303 and the third cavity 306. When the solenoid valve 3 is in the power-on state, the valve core 303 descends, and the valve core 303 seals the second cavity 305, and a gap is left between the top side of the valve core 303 and the third cavity 306.

[0023] Two time relays are used to form a purge circuit. After a fixed time, such as two hours, the solenoid valve 3 is actuated and the pipeline is switched to the purge circuit to purge the sampling pipeline. After a period of purge, such as 30 seconds, the time relay is disconnected and the measurement circuit is switched to the main circuit for measurement.

[0024] One end of the first cavity 304 is connected to a purge branch pipe 4 , one end of the purge branch pipe 4 is connected to a purge main pipe 5 , one end of the second cavity 305 is connected to a measuring pipeline 6 , and one end of the third cavity 306 is connected to a sampling pipeline 7 .

[0025] A protective housing 1 is provided outside the solenoid valve 3 , a protective door 2 is provided on one side of the protective housing 1 for protecting the solenoid valve 3 , and a transparent observation window is provided inside the protective door 2 on one side of the solenoid valve 3 for observing the solenoid valve 3 .

[0026] There are several sampling pipelines 7, and one end of each of the sampling pipelines 7 is provided with a solenoid valve 3. The same solenoid valve 3 is installed for measuring and sampling of industrial field pressure, differential pressure, and liquid level transmitters to achieve the same purging function.

[0027] One end of the purge main pipe 5 is connected to a plasma blower for providing pressure wind. The plasma wind blown by the plasma blower has a good dust removal effect and can play a good purge role. Figure 4 As shown, a stopper is provided at one end of the valve stem assembly 302. The stopper is made of plastic or hard rubber and is used to limit the movement of the valve stem assembly along the measuring pipeline 6 to prevent the valve stem assembly 302 from hitting the bottom.

[0028] When the automatic purging device for the sampling pipeline is used in a thermal power plant, the solenoid valve 3 is installed between the measuring pipeline 6 and the sampling pipeline 7, and the time relay is used to set the time and regularly open and close the solenoid valve 3. When the solenoid valve 3 is in a power-off state, the second cavity 305 and the third cavity 306 are connected, so that the sampling pipeline 7 and the measuring pipeline 6 are connected to each other, and normal sampling is achieved. When the set time is reached and the solenoid valve 3 is energized, the first cavity 304 and the third cavity 306 are connected, and the sampling pipeline 7 is connected to the purging branch pipe 4. The plasma blower is connected through the purging main pipe 5 to blow out plasma wind to purge the sampling pipeline 7 and the instrument pipelines above. Regular purging is performed every day to ensure that the instrument pipelines are unobstructed and the measurement accuracy is improved. The problem of inaccurate monitoring of industrial field pressure, differential pressure and liquid level transmitters due to the blockage of the sampling pipeline is solved, and manpower and material resources are saved when unblocking the pipeline, which can greatly improve work efficiency and enhance enterprise benefits.

[0029] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

Claims

1. Automatic purging device for sampling pipeline, including: A solenoid valve (3) and a sampling pipeline (7), characterized in that: the solenoid valve (3) comprises a valve body (301), a first cavity (304), a second cavity (305) and a third cavity (306) are provided inside the valve body (301), a valve stem assembly (302) is provided inside the valve body (301), a valve core (303) is provided on the outer wall of the valve stem assembly (302) between the first cavity (304), the second cavity (305) and the third cavity (306), when the solenoid valve (3) is in a power-off state, the second cavity (305) and the third cavity (306) are interconnected, and when the solenoid valve (3) is in a power-on state, the first cavity (304) and the third cavity (306) are interconnected.

2. The automatic purging device for sampling pipeline according to claim 1 is characterized in that: One end of the first cavity (304) is connected to a purge branch pipe (4), one end of the purge branch pipe (4) is connected to a purge main pipe (5), one end of the second cavity (305) is connected to a measuring pipeline (6), and one end of the third cavity (306) is connected to a sampling pipeline (7).

3. The automatic purging device for sampling pipeline according to claim 1 is characterized in that: A protective housing (1) is provided on the outside of the solenoid valve (3), a protective door (2) is provided on one side of the protective housing (1), and a transparent observation window is provided inside the protective door (2) and located on one side of the solenoid valve (3).

4. The automatic purging device for sampling pipeline according to claim 1 is characterized in that: When the solenoid valve (3) is in a power-off state, the valve core (303) seals the first cavity (304), and a gap is left between the bottom side of the valve core (303) and the third cavity (306); when the solenoid valve (3) is in a power-on state, the valve core (303) descends, the valve core (303) seals the second cavity (305), and a gap is left between the top side of the valve core (303) and the third cavity (306).

5. The automatic purging device for sampling pipeline according to claim 2 is characterized in that: There are a plurality of sampling pipelines (7), and a solenoid valve (3) is provided at one end of each of the plurality of sampling pipelines (7).

6. The automatic purging device for sampling pipeline according to claim 2 is characterized in that: One end of the purge main pipe (5) is connected to a plasma blower for providing pressure air.

7. The automatic purging device for sampling pipeline according to claim 1 is characterized in that: A limit block is provided at one end of the valve stem assembly (302).

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