A device for sampling liquefied petroleum gas
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INSPECTION & QUARANTINE TECH CENT SHANDONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
- Filing Date
- 2025-06-16
- Publication Date
- 2026-05-29
Smart Images
Figure CN224303360U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sampling device technology, and in particular to an export device for sampling liquefied petroleum gas. Background Technology
[0002] Liquefied petroleum gas (LPG) tanks contain a mixture of liquid and gaseous LPG, primarily composed of hydrocarbons such as propane, butane, and butene. Due to their large size and weight, LPG tanks are difficult to move and cannot be directly connected to a gas chromatograph (GC). Therefore, when detecting hydrocarbon components in LPG tanks, a sample must be transferred from the tank to a sampling container for temporary storage using an export device. The sample is then transferred to the GC instrument via the sampling container. Existing export devices typically include a main tube and an operating valve. The operating valve, located on the main tube, controls the flow rate of the fluid within it. The inlet of the main tube is connected to the LPG tank, and the outlet is connected to the sampling container. By sequentially opening the inlet valve of the sampling container, the operating valve, and the outlet valve of the LPG tank, the liquefied gas is introduced into the sampling container. After sampling, the operating valve, the inlet valve of the sampling container, and the outlet valve of the LPG tank are closed sequentially.
[0003] The existing sampling device only has one operating valve for controlling the flow rate. After sampling is completed, liquefied petroleum gas will remain in the main pipe. When the sampling device is removed, a large amount of liquefied petroleum gas in the main pipe will evaporate into the air, causing environmental pollution. It is also easy for sampling personnel to inhale, affecting their health. Utility Model Content
[0004] The main purpose of this invention is to propose an outlet device for liquefied petroleum gas (LPG) sampling, which aims to solve the technical problem that after sampling, a large amount of LPG remaining in the outlet device evaporates into the air.
[0005] To achieve the above objectives, this utility model proposes an outlet device for liquefied petroleum gas (LPG) sampling, comprising: a main pipe for connecting a sampling container and an LPG tank; a differential pressure valve, wherein a valve core is elastically installed inside the differential pressure valve, and the inlet and outlet ends of the differential pressure valve are connected when the pressure at the inlet end of the differential pressure valve exceeds the elasticity of the valve core; a differential pressure valve is installed at both the inlet and outlet ends of the main pipe, the inlet end of the main pipe is connected to the outlet end of an adjacent differential pressure valve, the outlet end of the LPG tank is connected to the inlet end of an adjacent differential pressure valve; the outlet end of the main pipe is connected to the inlet end of an adjacent differential pressure valve, and the sampling container is connected to the outlet end of an adjacent differential pressure valve.
[0006] Optionally, the differential pressure valve includes a valve body, which includes an inlet chamber and an outlet chamber. The inlet end of the main body pipe is connected to the outlet chamber of an adjacent differential pressure valve, and the outlet end of the main body pipe is connected to the inlet chamber of an adjacent differential pressure valve. The inlet chamber and the outlet chamber are connected through a through hole. The valve core includes a piston head and a connecting rod that are connected to each other. The connecting rod is elastically installed in the outlet chamber, and the piston head is located in the through hole.
[0007] Optionally, the diameter of the via gradually increases from the inlet end to the outlet end; the piston head is located inside the via; the end face of the piston head near the intake chamber is smaller than the end face near the outlet chamber; the peripheral wall of the piston head abuts against the inner wall of the via.
[0008] Optionally, the side of the air outlet chamber away from the through hole also has a mounting cavity, which is coaxially arranged with the through hole, and the axis of the through hole is perpendicular to the axis of the main tube; a first elastic element is provided in the mounting cavity; the differential pressure valve includes a valve cover, which is movably mounted on the valve body, and the inner cavity of the valve cover communicates with the mounting cavity; a limit baffle is provided on the connecting rod of the valve core, and the first elastic element is sleeved on the connecting rod, with both ends of the first elastic element abutting against the limit baffle and the valve cover respectively.
[0009] Optionally, the valve cover cavity is provided with an annular protrusion that protrudes into the mounting cavity. The center of the annular protrusion forms a mounting groove for mounting the first elastic element, and the mounting groove is coaxially arranged with the mounting cavity.
[0010] Optionally, a first sealing joint is provided between the differential pressure valve at the outlet end of the main pipe and the sampling container; a second sealing joint is provided between the differential pressure valve at the inlet end of the main pipe and the liquefied gas tank.
[0011] Optionally, an installation assembly is provided on the main pipe; the installation assembly includes a bottleneck pad, and there is a gap between the bottleneck pad and the differential pressure valve at the inlet end of the main pipe, the gap between the bottleneck pad and the differential pressure valve forming a connection space with the liquefied gas tank; when the outlet end on one side of the bottleneck of the liquefied gas tank is connected to the differential pressure valve, the bottleneck pad abuts against the other side of the bottleneck of the liquefied gas tank.
[0012] Optionally, the mounting assembly also includes a fixing block, a sliding rod, an operating rod, and a hinge plate; the fixing block is fixedly mounted on the outer peripheral wall of the main tube, the top of the fixing block is slidably mounted with a sliding rod, the bottleneck pad is mounted on the sliding rod, one end of the operating rod is hinged to the end of the fixing block away from the sliding rod, and both ends of the hinge plate are respectively connected to the middle of the operating rod and the end of the sliding rod away from the bottleneck pad.
[0013] Optionally, the fixing block includes a positioning part, a sliding part, and a hinge part, with the sliding part and hinge part located at opposite ends of the top of the positioning part; the positioning part is fixedly sleeved on the outer peripheral wall of the main tube; a sliding groove is provided inside the sliding part, with the groove opening located at the end away from the hinge part, and strip holes are provided on both sides of the sliding part, with the groove communicating with the strip holes; the end of the sliding rod away from the bottleneck pad is located inside the sliding groove, and a second elastic element is installed inside the sliding groove, with both ends of the second elastic element abutting against the bottom of the groove and the end face of the sliding rod, respectively; the hinge part is connected to the end of the operating rod, and the hinge plate is hinged to the sliding rod through the strip holes.
[0014] Optionally, the sliding rod includes a first rod and a second rod that are perpendicular to each other. The first rod is slidably installed in the groove, and the bottleneck pad is installed on the second rod. The bottleneck pad has an arc-shaped groove that matches the shape of the bottleneck of the liquefied gas tank.
[0015] This utility model's technical solution involves installing differential pressure valves at both ends of the main tube. The inlet of the differential pressure valve at one end of the main tube is connected to the outlet of the liquefied gas tank, and the outlet of the differential pressure valve at the other end of the main tube is connected to the inlet of the sampling container. Each differential pressure valve has a resiliently fitted valve core. During use, after opening the valves at the outlet of the liquefied gas tank and the inlet of the sampling container, the pressure inside the liquefied gas tank is greater than the pressure inside the sampling container. Driven by this pressure difference, the sample gas in the liquefied gas tank sequentially pushes the valve cores of the differential pressure valves at the inlet and outlet of the main tube to open, thus connecting the liquefied gas tank and the sampling container. After the gas enters and fills the sampling container... The pressure inside the sampling container gradually increases. When the sum of the pressure inside the sampling container and the elastic force of the valve core exceeds the pressure at the inlet of the differential pressure valve, the valve core resets and automatically disconnects the channel between the liquefied gas tank and the sampling container. Then, the valves at the inlet of the sampling container and the outlet of the liquefied gas tank are closed in sequence. After the valve at the outlet of the liquefied gas tank is closed, the pressure at the inlet of the main pipe disappears. Under the elastic action of the differential pressure valve, the valve core resets and seals most of the sample gas inside the main pipe, thereby reducing the amount of sample gas volatilized into the atmosphere, reducing environmental pollution caused during the sampling process, and improving the protection of sampling personnel. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 This is a front view schematic diagram of the present utility model;
[0019] Figure 3 This is a side view of the present invention;
[0020] Figure 4 for Figure 3 Schematic diagram of the cross section of AA;
[0021] Figure 5 for Figure 4 Enlarged view of region B in the middle;
[0022] Figure 6 A schematic diagram showing the connection between the inlet and outlet chambers of a differential pressure valve;
[0023] Figure 7 This is a schematic diagram showing the state of the mounting components when the present invention is installed on a liquefied gas tank;
[0024] Figure 8 This is a schematic diagram of the structure of this utility model when the operating lever is moved to the locking position.
[0025] Explanation of icon numbers:
[0026] 1. First sealing joint; 2. Differential pressure valve; 21. Valve body; 211. Inlet chamber; 212. Outlet chamber; 213. Through hole; 214. Mounting cavity; 22. Valve cover; 221. Annular protrusion; 23. Valve core; 231. Piston head; 232. Connecting rod; 233. Limiting baffle; 24. First elastic element; 3. Main tube; 5. Second sealing joint; 6. Fixing block; 61. Positioning part; 62. Sliding part; 621. Slide groove; 622. Strip hole; 63. Hinge part; 64. Second elastic element; 7. Sliding rod; 71. First rod body; 72. Second rod body; 73. Bottleneck pad; 731. Arc groove; 8. Operating rod; 9. Hinge plate.
[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0028] 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.
[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0030] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, provided that they are feasible for those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0031] This invention proposes an export device for sampling liquefied petroleum gas.
[0032] In the embodiments of this utility model, such as Figures 1-8 As shown, an outlet device for liquefied petroleum gas (LPG) sampling includes a main pipe 3 and a differential pressure valve 2. The main pipe 3 is used to connect a sampling container and an LPG tank. Differential pressure valves 2 are installed at both the inlet and outlet ends of the main pipe 3. A valve core 23 is elastically installed inside the differential pressure valve 2. When the pressure at the inlet end of the differential pressure valve 2 is greater than the sum of the elastic force of the valve core 23 and the pressure at the outlet end of the differential pressure valve 2, the inlet and outlet ends of the differential pressure valve 2 are connected. The inlet end of the main pipe 3 is connected to the outlet end of the adjacent differential pressure valve 2, the outlet end of the LPG tank is connected to the inlet end of the adjacent differential pressure valve 2, the outlet end of the main pipe 3 is connected to the inlet end of the adjacent differential pressure valve 2, and the sampling container is connected to the outlet end of the adjacent differential pressure valve 2.
[0033] Specifically, differential pressure valves 2 are installed at both ends of the main body pipe 3. The inlet end of the differential pressure valve 2 at the inlet end of the main body pipe 3 is connected to the outlet end of the liquefied gas tank, and the outlet end of the differential pressure valve 2 at the outlet end of the main body pipe 3 is connected to the inlet end of the sampling container. A valve core 23 is elastically installed inside the differential pressure valve 2. Before use, the sampling container is in a vacuum or negative pressure state, the pressure inside the main body pipe 3 is the same as the ambient gas pressure, and the pressure inside the liquefied gas tank is greater than the pressure inside the main body pipe 3 and the sum of the elastic force of the valve core 23 of the two differential pressure valves 2. In use, after connecting the differential pressure valves 2 at both ends of the main tube 3 to the liquefied gas tank and the sampling container respectively, and opening the valve at the outlet end of the liquefied gas tank and the valve at the inlet end of the sampling container, the sample gas in the liquefied gas tank, driven by the pressure difference, pushes the valve cores 23 of the differential pressure valves 2 at the inlet and outlet ends of the main tube 3 to open, thus connecting the liquefied gas tank and the sampling container. After the gas enters and fills the sampling container, the pressure inside the sampling container begins to gradually increase. When the sum of the pressure inside the sampling container and the elastic force of the valve core 23 exceeds a certain value... After the pressure at the inlet of differential pressure valve 2 is reduced, valve core 23 resets and automatically disconnects the channel between the liquefied gas tank and the sampling container. Then, the valves at the outlet of the liquefied gas tank and the inlet of the sampling container are closed in sequence to complete the sampling. After the valve at the outlet of the liquefied gas tank is closed, the pressure at the inlet of the main tube 3 disappears. Under the elastic action of differential pressure valve 2, valve core 23 at both ends of the main tube 3 resets and seals most of the sample gas inside the main tube 3, thereby reducing the amount of sample gas volatilized into the atmosphere, reducing environmental pollution caused during the sampling process, and improving the protection of sampling personnel.
[0034] Optionally, the differential pressure valve 2 includes a valve body 21, which includes an inlet chamber 211 and an outlet chamber 212. The inlet end of the main body pipe 3 is connected to the outlet chamber 212 of the adjacent differential pressure valve 2, and the outlet end of the main body pipe 3 is connected to the inlet chamber 211 of the adjacent differential pressure valve 2. The inlet chamber 211 and the outlet chamber 212 are connected through a through hole 213. The valve core 23 includes a piston head 231 and a connecting rod 232 connected to each other. The connecting rod 232 is elastically installed in the outlet chamber 212, and the piston head 231 is located in the through hole 213.
[0035] Specifically, before use, the elastic force of the valve core 23 is greater than atmospheric pressure, so the inside of the main tube 3 is in a sealed state. When the pressure in the inlet chamber 211 of the differential pressure valve 2 is greater than the pressure in the outlet chamber 212 and the sum of the elastic force of the valve core 23, under the action of the differential pressure, the piston head 231 is pushed away from the through hole 213, so that the inlet chamber 211 and the outlet chamber 212 are connected, and the sample gas can enter the outlet chamber 212 from the inlet chamber 211. When the pressure in the inlet chamber 211 is less than the sum of the elastic force of the valve core 23 and the pressure in the outlet chamber 212, the valve core 23 resets and seals the through hole 213, thereby disconnecting the inlet chamber 211 and the outlet chamber 212. Therefore, during use, after the outlet valve of the liquefied gas tank is opened, the pressure inside the liquefied gas tank is greater than the sum of the elastic force of the valve core 23 of the two differential pressure valves 2 and the pressure inside the sampling container. The high-pressure sample gas inside the liquefied gas tank enters the air inlet chamber 211 of the differential pressure valve 2 at the inlet end of the main tube 3, and sequentially pushes the valve core 23 of the two differential pressure valves 2 into the inner cavity of the sampling container, where it converges and completes the sampling.
[0036] Optionally, the diameter of the through hole 213 gradually increases from the inlet end to the outlet end; the piston head 231 is located inside the through hole 213; the end face of the piston head 231 near the intake chamber 211 is smaller than the end face near the outlet chamber 212; the peripheral wall of the piston head 231 abuts against the inner wall of the through hole 213.
[0037] Specifically, both the through hole 213 and the piston head 231 are tapered, which allows the piston head 231 to have a larger contact area with the side wall of the through hole 213, making it easier to seal the through hole 213 when the piston head 231 is blocked inside the through hole 213.
[0038] Optionally, the side of the air outlet chamber 212 away from the through hole 213 also has an installation cavity 214, which is coaxially arranged with the through hole 213 and the axis of the through hole 213 is perpendicular to the axis of the main body tube 3; a first elastic element 24 is provided in the installation cavity 214; the differential pressure valve 2 includes a valve cover 22, which is movably installed on the valve body 21 and the inner cavity of the valve cover 22 is connected to the installation cavity 214; a limit baffle 233 is provided on the connecting rod 232 of the valve core 23, and the first elastic element 24 is sleeved on the connecting rod 232, and the two ends of the first elastic element 24 abut against the limit baffle 233 and the valve cover 22 respectively.
[0039] Specifically, during use, when the sampling container and the liquefied gas tank are disconnected from the differential pressure valve 2, the pressure inside the main tube 3 may be greater than the sum of atmospheric pressure and the pressure of the valve core 23. This causes some of the sample gas inside the main tube 3 to enter the environment through the differential pressure valve 2 at the outlet end of the main tube 3. In this embodiment, by movably mounting the valve cover 22 on the valve body 21, and with both ends of the first elastic element 24 abutting against the limiting baffle 233 and the valve cover 22 respectively, the elastic force of the valve core 23 can be adjusted by adjusting the position of the valve cover 22 on the valve body 21. Therefore, before disconnecting the connection between the sample container and the differential pressure valve 2, the valve cover 22 of the differential pressure valve 2 at the outlet end of the main tube 3 can be adjusted to reduce the distance between the valve cover 22 and the through hole 213, thereby increasing the elastic force applied to the limit baffle 233 by the elastic element, and further increasing the pressure applied to the through hole 213 by the valve core 23. This ensures that the sum of the ambient atmospheric pressure and the elastic force of the valve core 23 of the differential pressure valve 2 at the outlet end of the main tube 3 is greater than the pressure of the sample gas inside the main tube 3, thus ensuring that the differential pressure valves 2 at both ends of the main tube 3 remain sealed after the connection between the sample container and the differential pressure valve 2 is disconnected, further preventing the sample gas from entering the sampling environment.
[0040] Preferably, the first elastic element 24 is a non-linear spring. As the compression of the first elastic element 24 increases, its elastic force becomes stronger. Therefore, by shortening the distance between the valve cover 22 and the limiting plate, the compression of the first elastic element 24 can be increased, thereby increasing the elastic force of the valve core 23.
[0041] Preferably, the valve cover 22 and the valve body 21 are connected by threads, and the elastic force of the valve core 23 can be adjusted by screwing the valve cover 22.
[0042] Optionally, the inner cavity of the valve cover 22 is provided with an annular protrusion 221, which protrudes into the mounting cavity 214. The center of the annular protrusion 221 forms a mounting groove for mounting the first elastic element 24, and the mounting groove is coaxially arranged with the mounting cavity 214.
[0043] Specifically, the inner diameter of the mounting cavity 214 is larger than the outer diameter of the spring, the outer diameter of the limiting plate, and the outer diameter of the piston head 231, so that the valve core 23 can be installed into the valve body 21 through the mounting cavity 214. The mounting groove formed in the inner cavity of the valve cover 22 is used to limit the circumferential movement of the first elastic element 24, thereby keeping the first elastic element 24 coaxial with the through hole 213. During installation, the valve core 23 is first placed from the mounting cavity 214 into the valve body 21, ensuring that the piston head 231 is located in the through hole 213. Then, one end of the first elastic element 24 is placed in the mounting groove, and the other end of the first spring element is placed into the mounting cavity 214, so that the first elastic element 24 is fitted onto the connecting rod 232. Then, the valve cover 22 is screwed on, so that the first elastic element 24 abuts against the limiting baffle 233.
[0044] Optionally, a first sealing joint 1 is provided between the differential pressure valve 2 at the outlet end of the main pipe 3 and the sampling container; a second sealing joint 5 is provided between the differential pressure valve 2 at the inlet end of the main pipe 3 and the liquefied gas tank.
[0045] Specifically, both the first sealing joint 1 and the second sealing joint 5 are rubber joints. One end of the first sealing joint 1 is embedded in the air inlet chamber 211 of the differential pressure valve 2. During use, the other end is pressurized with the valve at the outlet end of the sampling container through elastic deformation, thereby sealing the connection between the sampling container and the differential pressure valve 2. The sealing method between the second sealing joint 5 and the liquefied gas tank is the same as that between the first sealing joint 1 and the sampling container, and will not be described in detail here.
[0046] Optionally, an installation assembly is provided on the main tube 3; the installation assembly includes a bottleneck pad 73, and there is a gap between the bottleneck pad 73 and the differential pressure valve 2 at the inlet end of the main tube 3. The gap between the bottleneck pad 73 and the differential pressure valve 2 forms a connection space with the liquefied gas tank; when the outlet end on one side of the bottleneck of the liquefied gas tank is connected to the differential pressure valve 2, the bottleneck pad 73 abuts against the other side of the bottleneck of the liquefied gas tank.
[0047] Specifically, by using the bottleneck pad 73 to press the first sealing joint 1 against the valve at the outlet end of the liquefied gas tank, the outlet device can be fixed while ensuring the sealing effect between the liquefied gas tank and the differential pressure valve 2.
[0048] Optionally, the mounting assembly also includes a fixing block 6, a sliding rod 7, an operating rod 8, and a hinge plate 9; the fixing block 6 is fixedly installed on the outer peripheral wall of the main tube 3, the top of the fixing block 6 is slidably mounted with the sliding rod 7, the bottleneck pad 73 is mounted on the sliding rod 7, one end of the operating rod 8 is hinged to the end of the fixing block 6 away from the sliding rod 7, and both ends of the hinge plate 9 are respectively connected to the middle of the operating rod 8 and the end of the sliding rod 7 away from the bottleneck pad 73.
[0049] Specifically, the fixing block 6 includes a positioning part 61, a sliding part 62, and a hinge part 63. The sliding part 62 and the hinge part 63 are located at the two ends of the top of the positioning part 61, respectively. The positioning part 61 is fixedly sleeved on the outer peripheral wall of the main tube 3. A sliding groove 621 is provided in the sliding part 62. The groove opening of the sliding groove 621 is located at the end away from the hinge part 63. Strip holes 622 are provided on both sides of the sliding part 62. The sliding groove 621 communicates with the strip holes 622. The end of the sliding rod 7 away from the bottleneck pad 73 is located in the sliding groove 621. A second elastic element is installed in the sliding groove 621. The two ends of the second elastic element abut against the bottom of the groove 621 and the end face of the sliding rod 7, respectively. The hinge part 63 is connected to the end of the operating rod 8. The hinge plate 9 is hinged to the sliding rod 7 through the strip hole 622. The sliding rod 7 includes a first rod 71 and a second rod 72 that are perpendicular to each other. The first rod 71 is slidably installed in the sliding groove 621, and the bottleneck pad 73 is installed on the second rod 72. The bottleneck pad 73 has an arc-shaped groove 731 that is adapted to the shape of the bottleneck of the liquefied gas tank. The arc-shaped groove 731 makes the bottleneck pad 73 have a larger contact area with the bottleneck of the liquefied gas tank.
[0050] Specifically, the end of the first rod 71 is rotatably connected to one end of the hinge plate 9 through the strip hole 622 via a pin or pin shaft, and the other end of the hinge plate 9 is hinged to the middle of the operating rod 8.
[0051] Specifically, the second elastic element is a spring.
[0052] When not in use, the second elastic element in the chute 621 is in an uncompressed state. At this time, the distance between the bottleneck pad 73 and the second sealing joint 5 is greater than the diameter of the bottleneck of the liquefied gas tank. In use, first place the outlet device so that the bottleneck of the liquefied gas tank is located within the gap between the second sealing joint 5 and the bottleneck pad 73; then align and connect the differential pressure valve 2 with the outlet valve located on one side of the bottleneck of the liquefied gas tank, and seal the connection between the differential pressure valve 2 and the liquefied gas tank with the second sealing joint 5; finally, move the operating lever 8 towards the outlet end of the main tube 3 so that the operating lever 8, through the hinge plate 9, drives the sliding rod 7 to move towards the outlet end of the main tube 3, thereby causing the bottleneck pad 73 to press against the other side of the bottleneck of the liquefied gas tank. When the operating lever 8 is moved to the locked position, the hinge plate 9 and the first rod body 71 of the sliding rod 7 are on the same straight line (e.g., Figure 8As shown in the diagram, at this time, the second sealing joint 5 and the bottleneck pad 73 simultaneously press against both sides of the bottleneck of the liquefied gas tank. Under the elastic force of the second elastic element, the forces at both ends of the hinge plate 9 are on the same straight line. Without the action of external force, the hinge plate 9 will not rotate, thus completing the fixation of the outlet device on the liquefied gas tank. When removing the outlet device, by lifting the operating rod 8 towards the end away from the main tube 3, the forces at both ends of the hinge plate 9 are no longer on the same straight line. Under the push of the elastic force of the second elastic element, the sliding rod 7 automatically pops out, so that the bottleneck pad 73 is away from the bottleneck of the liquefied gas tank, thereby allowing the outlet device to be removed.
[0053] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A sampling and extraction device for liquefied petroleum gas, characterized in that, include: Main tube (3), the main tube (3) is used to connect the sampling container and the liquefied gas tank; Differential pressure valve (2), wherein a valve core (23) is elastically provided inside the differential pressure valve (2). When the pressure at the inlet end of the differential pressure valve (2) is greater than the sum of the elastic force of the valve core (23) and the pressure at the outlet end of the differential pressure valve (2), the inlet end and the outlet end of the differential pressure valve (2) are connected. The main tube (3) is equipped with differential pressure valves (2) at both its inlet and outlet ends. The inlet end of the main tube (3) is connected to the outlet end of the adjacent differential pressure valve (2), and the outlet end of the liquefied gas tank is connected to the inlet end of the adjacent differential pressure valve (2). The outlet end of the main tube (3) is connected to the inlet end of the adjacent differential pressure valve (2), and the sampling container is connected to the outlet end of the adjacent differential pressure valve (2).
2. The export device for liquefied petroleum gas sampling as described in claim 1, characterized in that, The differential pressure valve (2) includes a valve body (21), which includes an air inlet chamber (211) and an air outlet chamber (212). The air inlet end of the main body pipe (3) is connected to the air outlet chamber (212) of the adjacent differential pressure valve (2), and the air outlet end of the main body pipe (3) is connected to the air inlet chamber (211) of the adjacent differential pressure valve (2). The air inlet chamber (211) and the air outlet chamber (212) are connected by a through hole (213); The valve core (23) includes a piston head (231) and a connecting rod (232) connected to each other. The connecting rod (232) is elastically installed in the air outlet chamber (212), and the piston head (231) is located in the through hole (213).
3. The export device for liquefied petroleum gas sampling as described in claim 2, characterized in that, The diameter of the through hole (213) gradually increases from the inlet end to the outlet end; the piston head (231) is located inside the through hole (213); the end face of the piston head (231) near the air inlet chamber (211) is smaller than the end face near the air outlet chamber (212); the peripheral wall of the piston head (231) abuts against the inner wall of the through hole (213).
4. The outlet device for liquefied petroleum gas sampling as described in claim 3, characterized in that, The air outlet chamber (212) also has an installation cavity (214) on the side away from the through hole (213). The installation cavity (214) is coaxially arranged with the through hole (213), and the axis of the through hole (213) is perpendicular to the axis of the main tube (3). A first elastic element (24) is provided in the installation cavity (214). The differential pressure valve (2) includes a valve cover (22), which is movably mounted on the valve body (21), and the inner cavity of the valve cover (22) is connected to the mounting cavity (214); A limit baffle (233) is provided on the connecting rod (232) of the valve core (23). The first elastic element (24) is sleeved on the connecting rod (232), and the two ends of the first elastic element (24) abut against the limit baffle (233) and the valve cover (22) respectively.
5. The outlet device for liquefied petroleum gas sampling as described in claim 4, characterized in that, The valve cover (22) has an annular protrusion (221) in its inner cavity. The annular protrusion (221) protrudes into the mounting cavity (214). The center of the annular protrusion (221) forms a mounting groove for mounting the first elastic element (24). The mounting groove is coaxially arranged with the mounting cavity (214).
6. The export device for liquefied petroleum gas sampling as described in claim 1, characterized in that, A first sealing joint (1) is provided between the differential pressure valve (2) at the outlet end of the main tube (3) and the sampling container. A second sealing joint (5) is provided between the differential pressure valve (2) at the inlet end of the main pipe (3) and the liquefied gas tank.
7. The outlet device for liquefied petroleum gas sampling as described in claim 1, characterized in that, The main tube (3) is provided with an installation component; The installation assembly includes a bottleneck pad (73), which has a gap with the differential pressure valve (2) at the inlet end of the main tube (3), and the gap between the bottleneck pad (73) and the differential pressure valve (2) forms a connection space with the liquefied gas tank. When the outlet end on one side of the bottleneck of the liquefied gas tank is connected to the differential pressure valve (2), the bottleneck pad (73) abuts against the other side of the bottleneck of the liquefied gas tank.
8. The outlet device for liquefied petroleum gas sampling as described in claim 7, characterized in that, The mounting assembly also includes a fixing block (6), a sliding rod (7), an operating rod (8), and a hinge plate (9); The fixing block (6) is fixedly installed on the outer peripheral wall of the main tube (3). A sliding rod (7) is slidably installed on the top of the fixing block (6). The bottleneck pad (73) is installed on the sliding rod (7). One end of the operating rod (8) is hinged to the end of the fixing block (6) away from the sliding rod (7). The two ends of the hinge plate (9) are respectively connected to the middle of the operating rod (8) and the end of the sliding rod (7) away from the bottleneck pad (73).
9. The outlet device for liquefied petroleum gas sampling as described in claim 8, characterized in that, The fixing block (6) includes a positioning part (61), a sliding part (62) and a hinge part (63), wherein the sliding part (62) and the hinge part (63) are located at the two ends of the top of the positioning part (61); The positioning part (61) is fixedly sleeved on the outer peripheral wall of the main tube (3); The sliding part (62) is provided with a sliding groove (621), the groove opening of the sliding groove (621) is located at one end away from the hinge part (63), and the sliding part (62) is provided with strip holes (622) on both sides, and the sliding groove (621) communicates with the strip holes (622). The end of the sliding rod (7) away from the bottleneck pad (73) is located in the groove (621). A second elastic element (64) is installed in the groove (621). The two ends of the second elastic element (64) abut against the bottom of the groove (621) and the end face of the sliding rod (7), respectively. The hinge (63) is connected to the end of the operating lever (8), and the hinge plate (9) is hinged to the sliding rod (7) through the strip hole (622).
10. The outlet device for liquefied petroleum gas sampling as described in claim 9, characterized in that, The sliding rod (7) includes a first rod body (71) and a second rod body (72) that are perpendicular to each other. The first rod body (71) is slidably installed in the slide groove (621), and the bottleneck pad (73) is installed on the second rod body (72). The bottleneck pad (73) has an arc-shaped groove (731) that is adapted to the shape of the bottleneck of the liquefied gas tank.