Constant-pressure sampling device

Abstract

The utility model relates to the technical field of sampling, and discloses a constant pressure sampling device which comprises an upper cover, a shell and a lower cover, a plurality of mounting grooves are formed in the shell, and a plurality of liquid level sensors, an air pressure adjusting device, a buffer plate and a buffer cavity are mounted inside or outside the shell through the mounting grooves. The air pressure adjusting device is used for adjusting the internal pressure of the device, so that the pressure in the sampling process is kept constant; the number of the liquid level sensors is two or more, the liquid level sensor closest to the bottom of the shell is used for setting the zero position of the sampling volume, and the other liquid level sensors are arranged according to different volume sampling requirements. According to the utility model, constant pressure is maintained during sampling through the air pressure adjusting device, pressure is automatically released during feeding, and pressure is automatically increased during discharging, so that the influence of pressure fluctuation on precision is avoided; a plurality of liquid level sensors are arranged in the device, zero positions are arranged at the bottoms of the liquid level sensors, the sampling volume of other liquid level sensors can be adjusted according to needs, and the sampling accuracy and convenience are improved.

Description

Technical Field

[0001] This utility model relates to the field of sampling technology, and in particular to a constant pressure sampling device. Background Technology

[0002] A constant-pressure sampling device consists of a pressure control unit, sampling container, connecting pipes, valves, and pressure sensors, and can maintain a constant sample pressure during sampling. In the petroleum and chemical industries, it ensures that the sample composition and properties remain unchanged, guaranteeing its representativeness; in environmental monitoring, it prevents changes in sample composition due to pressure fluctuations, improving analytical accuracy; in scientific research experiments, it provides stable sampling pressure to ensure repeatability; and in high-pressure environments, it also protects equipment and personnel safety.

[0003] Existing sampling devices are prone to pressure fluctuations during use. Factors such as unstable external gas sources and changes in pipeline fluid velocity often interfere with system pressure, and simple pressure regulating devices are slow to respond and difficult to deal with effectively. Existing sampling devices also suffer from unstable flow control, and the flow control elements with poor accuracy cannot accurately adjust the flow rate, making it difficult to achieve constant sampling. Therefore, a constant pressure sampling device is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a constant pressure sampling device, which aims to improve the problem that existing sampling devices cannot meet the constant pressure sampling requirements, resulting in a decrease in sampling accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a constant pressure sampling device, comprising an upper cover, a housing, and a lower cover, wherein the housing is provided with a plurality of mounting slots, and a plurality of liquid level sensors, a pressure regulating device, a buffer plate, and a buffer chamber are installed inside or outside the housing through the mounting slots. The pressure regulating device is used to regulate the internal pressure of the device so that the pressure during the sampling process remains constant.

[0006] Furthermore, the number of the liquid level sensors is two or more, wherein the liquid level sensor closest to the bottom of the housing is used to set the "zero position" of the sampling volume, and the remaining liquid level sensors are set according to different volume sampling requirements to achieve multiple volume sampling.

[0007] Furthermore, the lower cover has a through-hole and an outlet that are arranged opposite to each other.

[0008] Furthermore, the buffer plate is a porous plate, and the buffer plate is disposed inside the buffer cavity.

[0009] Furthermore, the pressure regulating device is connected to the sampling device via a pipeline, and the pressure regulating device is used to control the internal pressure of the housing to maintain a constant pressure during the sampling process.

[0010] Furthermore, the upper cover, the shell, and the lower cover are integrally molded.

[0011] Furthermore, the shell can be made of metal or non-metal materials, and can be transparent or opaque, without the need for scale markings.

[0012] Furthermore, the buffer cavity is disposed between the feed inlet and the housing, and the volume of the buffer cavity is larger than that of the feed inlet.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, a constant pressure can be maintained during the sampling process by means of an air pressure regulating device, so as to avoid the impact of pressure fluctuations caused by feeding and discharging on the sampling accuracy. When feeding, the air pressure regulating device automatically depressurizes and when discharging, it automatically pressurizes to ensure stable sampling. The device is equipped with multiple liquid level sensors. The bottom sensor is set to "zero position" and the other sensors can adjust the sampling volume to meet different needs and improve the accuracy and convenience of sampling.

[0015] 2. In this utility model, by adopting a buffer chamber and buffer plate structure, the flow rate of liquid entering the device is reduced, the liquid surface fluctuation is reduced, and the sampling accuracy is improved. The volume of the buffer chamber is larger than that of the feed inlet, and the buffer plate is a perforated plate design to make the liquid surface rise evenly and prevent liquid level sensor errors. In addition, the device can be connected to PLC, relay, solenoid valve, etc. to realize automated sampling, reduce manual operation, and improve the efficiency of use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a constant pressure sampling device proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the buffer plate portion of a constant pressure sampling device proposed in this utility model;

[0018] Figure 3 This is a schematic diagram of the inlet section of a constant pressure sampling device proposed in this utility model.

[0019] Legend:

[0020] 1. Top cover; 2. Housing; 3. Bottom cover; 4. Liquid level sensor; 5. Air pressure regulating device; 6. Buffer plate; 7. Buffer chamber; 8. Inlet; 9. Outlet. Detailed Implementation

[0021] 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.

[0022] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment of a constant pressure sampling device, comprising an upper cover 1, a housing 2, and a lower cover 3. The housing 2 is provided with several mounting slots, through which several liquid level sensors 4, a pressure regulating device 5, a buffer plate 6, and a buffer chamber 7 can be installed inside or outside the housing 2. The pressure regulating device 5 is used to regulate the internal pressure of the device to keep the pressure constant during the sampling process. The liquid level sensors 4 include two or more, wherein the liquid level sensor 4 closest to the bottom of the housing 2 is used to set the "zero position" of the sampling volume, and the remaining liquid level sensors 4 are set according to different volume sampling requirements to achieve multiple volume sampling. The lower cover 3 is provided with a feed inlet 8 and a discharge outlet 9 arranged opposite to each other.

[0023] Specifically, the device comprises an upper cover 1, a housing 2, and a lower cover 3. The housing 2 has several mounting slots, through which several liquid level sensors 4, a pressure regulating device 5, a buffer plate 6, and a buffer chamber 7 can be installed, either inside or outside the housing 2. The pressure regulating device 5 regulates the internal pressure of the device, keeping the pressure constant during sampling to avoid pressure fluctuations caused by material inflow and outflow affecting sampling accuracy, thus improving sampling stability and accuracy. The buffer chamber 7 is located between the inlet 8 and the housing 2. The volume of the buffer chamber 7 is larger than that of the inlet 8, allowing liquid to enter slowly, reducing liquid level fluctuations and improving sampling accuracy. The buffer plate 6 is a perforated plate. The level sensor 4 is placed inside the buffer chamber 7 to further reduce liquid fluctuations, ensure a uniform rise in liquid level, prevent errors in the level sensor 4, and guarantee the accuracy of measurement data. The level sensor 4 includes two or more, with the level sensor 4 closest to the bottom of the housing 2 used to set the "zero position" of the sampling volume. The remaining level sensors 4 are set according to different volume sampling requirements to achieve multiple volume sampling, meet different application needs, and improve the convenience and flexibility of use. The lower cover 3 has a through-hole with a feed inlet 8 and a discharge outlet 9 arranged opposite to each other for the input and output of liquid materials, ensuring the continuity and stability of the sampling process.

[0024] Reference Figure 1 , Figure 2 and Figure 3The buffer plate 6 is a perforated plate and is located inside the buffer chamber 7. The air pressure regulating device 5 is connected to the sampling device through a pipeline. The air pressure regulating device 5 is used to control the air pressure inside the shell 2 to maintain a constant pressure during the sampling process. The upper cover 1, the shell 2 and the lower cover 3 are integrally molded. The shell 2 can be made of metal or non-metal materials and can be transparent or opaque, without the need for scale markings. The buffer chamber 7 is located between the feed inlet 8 and the shell 2, and the volume of the buffer chamber 7 is larger than that of the feed inlet 8.

[0025] Specifically, the buffer plate 6 is a perforated plate, which is set inside the buffer chamber 7. The perforated plate structure can effectively disperse the liquid flow rate, so that the liquid entering the buffer chamber 7 is evenly distributed, reducing flow impact, improving sampling stability, and avoiding the impact of liquid surface fluctuation on the detection accuracy of the liquid level sensor 4. The buffer chamber 7 is set between the feed inlet 8 and the housing 2. The volume of the buffer chamber 7 is larger than that of the feed inlet 8, so that the liquid enters slowly, reducing the impact force of the liquid, reducing sampling error, and improving the reliability of the data. The air pressure regulating device 5 is connected to the sampling device via a pipeline. The air pressure regulating device 5 is used to control the air pressure inside the housing 2 to maintain a constant pressure during the sampling process. It automatically depressurizes when the internal space shrinks and the pressure rises due to feeding, and automatically pressurizes when the space expands and the pressure drops due to discharging, ensuring the stability of the sampling environment. The upper cover 1, housing 2 and lower cover 3 are integrally molded, making the overall structure of the device more compact, improving sealing, reducing the risk of liquid leakage, and enhancing the mechanical strength of the device, thus extending its service life. The housing 2 can be made of metal or non-metal materials and can be transparent or opaque. A transparent structure makes it easy to observe the liquid state, while an opaque structure can effectively isolate external light interference, making it suitable for different usage environments. It does not require scale markings, avoiding the impact of scale wear or visual errors on measurement accuracy, and improving the stability and reliability of sampling data.

[0026] Working Principle: When this constant pressure sampling device is needed, during the sampling process, the liquid first enters the buffer chamber 7 through the inlet 8. The volume of the buffer chamber 7 is larger than that of the inlet 8, which reduces the liquid flow rate, reduces fluid impact, and avoids liquid surface fluctuations affecting sampling accuracy. A buffer plate 6 is installed inside the buffer chamber 7. The buffer plate 6 has a porous plate structure, which disperses the liquid flow, further reducing the flow rate and improving sampling stability. Multiple liquid level sensors 4 are installed inside the housing 2. The liquid level sensor 4 closest to the bottom of the housing 2 is used to set the "zero point" of the sampling volume. The remaining liquid level sensors 4 are set according to different sampling requirements to achieve... Multiple volume sampling is available. During the sampling process, the air pressure regulating device 5 is used to maintain a constant internal pressure in the shell 2 to avoid pressure fluctuations caused by material feeding and discharging affecting the liquid flow, thereby ensuring sampling accuracy and consistency. When the sample reaches the set liquid level, the air pressure regulating device 5 stops adjusting the pressure, and the control system discharges the sample through the discharge port 9. The shell 2 can be made of transparent or opaque material, without the need for scale markings, ensuring measurement stability. The overall structure adopts an integrated molding of the upper cover 1, shell 2, and lower cover 3, improving sealing and durability. At the same time, it can be connected to PLC, relays, solenoid valves, etc. to realize automated sampling and improve work efficiency.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A constant pressure sampling device comprising an upper cover (1), a housing (2) and a lower cover (3), characterized in that: The shell (2) is provided with a plurality of installation grooves, and the shell (2) is internally or externally provided with a plurality of liquid level sensors (4), air pressure adjusting devices (5), buffer plates (6) and buffer cavities (7) through the installation grooves, and the air pressure adjusting device (5) is used for adjusting the internal pressure, so that the pressure in the sampling process is kept constant.

2. The constant pressure sampling device of claim 1, wherein: The plurality of liquid level sensors (4) include two or more, wherein the liquid level sensor (4) closest to the bottom of the shell (2) is used for setting the "zero position" of the sampling volume, and the remaining liquid level sensors (4) are set according to different volume sampling requirements to realize multiple volume sampling.

3. The constant pressure sampling device of claim 1, wherein: The lower cover (3) is internally provided with oppositely arranged feeding ports (8) and discharging ports (9).

4. The constant pressure sampling device of claim 1, wherein: The buffer plate (6) is a porous plate, and the buffer plate (6) is arranged in the buffer cavity (7).

5. The constant pressure sampling device of claim 1, wherein: The air pressure adjusting device (5) is connected to the sampling device through a pipeline, and the air pressure adjusting device (5) is used for controlling the internal air pressure of the shell (2), so that the constant pressure in the sampling process is kept.

6. The constant pressure sampling device of claim 1, wherein: The upper cover (1), the shell (2) and the lower cover (3) are integrally formed.

7. The constant pressure sampling device of claim 1, wherein: The material of the shell (2) can be metal or non-metal material, and can be transparent or opaque structure, without scale line identification.

8. The constant pressure sampling device of claim 1, wherein: The buffer cavity (7) is arranged between the feeding port (8) and the shell (2), and the volume of the buffer cavity (7) is greater than that of the feeding port (8).

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