Liquefied petroleum gas sampling device convenient to operate

Abstract

The utility model discloses a liquefied petroleum gas sampling device convenient to operate, which comprises a box body, a lining plate is arranged in the box body, a positioning mechanism is arranged on the lining plate, a detachable sampling steel cylinder is arranged on the positioning mechanism, and a gas inlet pipe and a gas outlet pipe which are communicated with the sampling steel cylinder are arranged on the lining plate at two ends of the sampling steel cylinder. The air inlet pipe and the air outlet pipe are respectively provided with an air inlet emptying pipe and an air outlet emptying pipe, and the air inlet electromagnetic valve, the air outlet electromagnetic valve, the air inlet emptying electromagnetic valve and the air outlet emptying electromagnetic valve are arranged on the pipelines and are matched with a control circuit to realize automatic control, so that the sampling efficiency is obviously improved, and the labor intensity of operators is reduced; meanwhile, due to the design of the self-resetting normally-closed electromagnetic valve, the safety of the sampling process is ensured, and the valve can be automatically closed to prevent gas leakage even under the condition of accidental power failure or misoperation.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a liquefied petroleum gas sampling device which is convenient to operate. Background Technique

[0002] As an important energy source and chemical raw material, it is crucial to accurately detect the quality of liquefied petroleum gas during the production and circulation processes. At present, the sampling of liquefied petroleum gas mainly relies on an on-line circulation sampler to complete; however, the traditional on-line circulation sampler has significant deficiencies in design, mainly reflected in its operation mode.

[0003] The existing on-line circulation sampler mainly relies on manually operated valves to control the sampling process. This operation mode is not only inefficient, requiring operators to spend a lot of time and energy to manually operate each valve, but also prone to sampling failure or equipment damage due to operation errors; especially in high-pressure, high-temperature or toxic and harmful environments, manually operating the valves brings great potential safety hazards.

[0004] Therefore, in view of the problems existing in the prior art, the utility model patent proposes a liquefied petroleum gas sampling device which is convenient to operate, aiming to improve the sampling efficiency and reduce the risk of misoperation by improving the operation mode of the sampler. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the above technical deficiencies, propose a liquefied petroleum gas sampling device which is convenient to operate, and solve the problems put forward in the background technique.

[0006] To achieve the above technical purpose, the technical solution of the utility model provides a liquefied petroleum gas sampling device which is convenient to operate, including a box body. A lining plate is arranged inside the box body. A positioning mechanism is arranged on the lining plate. A detachable sampling steel cylinder is arranged on the positioning mechanism. An inlet pipe and an outlet pipe communicated with the sampling steel cylinder are arranged on the lining plate at both ends of the sampling steel cylinder. An inlet electromagnetic valve and an outlet electromagnetic valve are respectively arranged on the inlet pipe and the outlet pipe. An inlet evacuation pipe and an inlet pressure gauge are arranged on the inlet pipe between the inlet electromagnetic valve and the sampling steel cylinder. An outlet evacuation pipe and an outlet pressure gauge are arranged on the outlet pipe between the outlet electromagnetic valve and the sampling steel cylinder. An inlet evacuation electromagnetic valve and an outlet evacuation electromagnetic valve are arranged on the inlet evacuation pipe and the outlet evacuation pipe. A control circuit is arranged inside the box body. The control circuit is electrically connected to the inlet electromagnetic valve, the outlet electromagnetic valve, the inlet evacuation electromagnetic valve and the outlet evacuation electromagnetic valve to control their opening and closing.

[0007] Further, the control circuit includes a sampling circuit, an evacuation circuit, a locking circuit, and an alarm circuit. The sampling circuit is electrically connected to the intake solenoid valve and the outlet solenoid valve to control the opening of both for sampling. After sampling is completed, the evacuation circuit controls the opening of the intake evacuation solenoid valve and the outlet evacuation solenoid valve to discharge the gas between the sampling cylinder and the intake solenoid valve and the outlet solenoid valve. The sampling circuit and the evacuation circuit are interlocked.

[0008] Further, the positioning mechanism includes clamping blocks symmetrically arranged on both sides of the sampling cylinder. A chute is provided on the lining plate, and the clamping blocks are arranged in the chute. A rack is provided at the lower end of the clamping block, and a gear meshing with the two racks is arranged between the two racks. An operation knob coaxially connected to the gear is provided on the front surface of the lining plate, and an electromagnetic lock electrically connected to the locking circuit is provided on the operation knob.

[0009] Further, the intake pressure gauge and the outlet pressure gauge are electric contact pressure gauges, and the normally closed output terminals of both are electrically connected to the alarm circuit. When the sampling circuit is working, if no pressure is detected by any one of the intake pressure gauge and the outlet pressure gauge, an alarm signal is output.

[0010] Further, when any one of the sampling circuit and the evacuation circuit is operating, or when any one of the intake pressure gauge and the outlet pressure gauge detects pressure, the locking circuit outputs a locking signal.

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

[0012] 1. By adopting the intake solenoid valve DC1, the outlet solenoid valve DC3, the intake evacuation solenoid valve DC2, and the outlet evacuation solenoid valve DC4, and cooperating with the control circuit to achieve automatic control, the present utility model significantly improves the sampling efficiency and reduces the labor intensity of the operator. At the same time, the design of the self-resetting normally closed solenoid valve ensures the safety of the sampling process. Even in the event of accidental power failure or operation error, the valve can be automatically closed to prevent gas leakage.

[0013] 2. By setting the positioning mechanism 4, the alarm circuit 12, and the locking circuit 11, the safety and reliability of the liquefied petroleum gas sampler are further improved. Among them, the positioning mechanism 4 adopts a gear-rack transmission method and cooperates with the electromagnetic lock to achieve rapid clamping and locking of the sampling cylinder 3, preventing misoperation during the sampling process. The alarm circuit 12 can monitor the valve state of the sampling cylinder 3 in real time. Once a valve failure or incorrect opening is found, an alarm signal is immediately issued and the sampling is terminated, effectively avoiding sampling failure or safety accidents caused by valve problems. The locking circuit 11 ensures that the sampling cylinder 3 cannot be removed by the operation knob 403 during sampling, evacuation, or abnormal pressure, thereby further enhancing the safety of the equipment. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of a liquefied petroleum gas sampling device provided by the present utility model that is convenient to operate;

[0015] Figure 2 It is a schematic diagram of the positioning mechanism of a liquefied petroleum gas sampling device provided by the present utility model that is convenient to operate;

[0016] Figure 3 It is a schematic diagram of the control circuit of a liquefied petroleum gas sampling device provided by the present utility model that is convenient to operate. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0018] Referring to Figure 1 ,the present utility model provides a liquefied petroleum gas sampling device that is convenient to operate, mainly including a box body 1. A lining plate 2 is arranged inside the box body 1. A detachable sampling cylinder 3 is installed on the lining plate 2 through a positioning mechanism 4. An air inlet pipe 5 and an air outlet pipe 7 communicated with the sampling cylinder 3 are respectively arranged on the lining plate 2 at both ends of the sampling cylinder 3. An air inlet solenoid valve DC1 is arranged on the air inlet pipe 5. An air inlet evacuation pipe 6 and an air inlet pressure gauge DJ1 are sequentially arranged on the air inlet pipe 5 between the air inlet solenoid valve DC1 and the sampling cylinder 3; An air outlet solenoid valve DC3 is arranged on the air outlet pipe 7. An air outlet evacuation pipe 8 and an air outlet pressure gauge DJ2 are sequentially arranged on the air outlet pipe 7 between the air outlet solenoid valve DC3 and the sampling cylinder 3. An air inlet evacuation solenoid valve DC2 and an air outlet evacuation solenoid valve DC4 are respectively arranged on the air inlet evacuation pipe 6 and the air outlet evacuation pipe 8. Among them, the air inlet solenoid valve DC1, the air outlet solenoid valve DC3, the air inlet evacuation solenoid valve DC2 and the air outlet evacuation solenoid valve DC4 are all self-resetting normally closed type, and the air inlet pressure gauge DJ1 and the air outlet pressure gauge DJ2 are both electric contact pressure gauges.

[0019] Referring to Figure 2, the positioning mechanism 4 includes clamping blocks 401 symmetrically arranged on both sides of the sampling cylinder 3. A sliding groove 201 is provided on the lining plate 2, and the clamping blocks 401 are slidably arranged in the sliding groove 201; a rack 404 is provided at the lower end of the clamping block 401, and a gear 402 meshing with the two racks 404 is arranged between the two racks 404; an operation knob 403 coaxially connected to the gear 402 is provided on the front surface of the lining plate 2, and an electromagnetic lock (not shown in the figure) is installed on the operation knob 403; by rotating the operation knob 403, the gear 402 can be driven to rotate, and then the two clamping blocks 401 can be driven to slide in the sliding groove 201 to clamp or loosen the sampling cylinder 3, and the electromagnetic lock is used to lock the operation knob 403 during the sampling process to prevent misoperation.

[0020] A control circuit is also provided in the box body 1. Refer to Figure 3 The control circuit includes a sampling circuit 9, an evacuation circuit 10, a locking circuit 11, and an alarm circuit 12.

[0021] To facilitate the understanding of the present invention, the following is combined with Figure 1 - Figure 3 to explain the working principle of this solution in detail:

[0022] Before sampling, both ends of the sampling cylinder 3 are connected to the intake pipe 5 and the outlet pipe 7 respectively, and the operation knob 403 is rotated to clamp and fix the sampling cylinder 3 through the two clamping blocks 401.

[0023] During sampling, the button SB1 installed on the door panel of the box body 1 is pressed to control the KA1 to attract and self-lock, and the intake solenoid valve DC1 and the outlet solenoid valve DC3 are opened to connect the sampling cylinder 3 with the gas source for cyclic sampling, and at the same time KT1 starts timing; after the timing of KT1 ends, KA1 is powered off and the intake solenoid valve DC1 and the outlet solenoid valve DC3 automatically reset and close.

[0024] Before removing the sampling cylinder 3, the valves at both ends of the sampling cylinder 3 need to be closed first, and the residual gas in the intake pipe 5 between the intake solenoid valve DC1 and the sampling cylinder 3 and the outlet pipe 7 between the outlet solenoid valve DC3 and the sampling cylinder 3 needs to be evacuated; at this time, the button SB2 is pressed to control the KA2 to attract and self-lock, and the intake evacuation solenoid valve DC2 and the outlet evacuation solenoid valve DC4 are opened.

[0025] The locking circuit 11 is provided to prevent misoperation during sampling. In the locking circuit 11, the normally open contacts of KA1, KA2, DJ1, and DJ2 are connected in parallel and then connected in series with the electromagnetic lock DS installed on the operation knob 403. With such a setting, the sampling cylinder 3 cannot be removed by operating the knob 403 during sampling, evacuation, or when either DJ1 or DJ2 has pressure.

[0026] The alarm circuit 12 is set to prevent valve failures or incorrect openings of the sampling cylinder 3. When KA1 is energized, if either DJ1 or DJ2 fails to detect pressure, KT3 starts timing and the buzzer F sounds. If the state remains unchanged after the timing ends, the coil power supply of KA1 is cut off to terminate the sampling. In practical applications, a gas alarm can also be installed inside the box 1. Its alarm non-powered output terminal is connected in parallel with the output terminals of DJ1 and DJ2, or directly in series with the power supply terminal of the control circuit. When gas leakage occurs during sampling, the sampling is directly terminated.

[0027] The specific implementation manners of the present utility model described above do not constitute a limitation on the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A convenient-to-operate liquefied petroleum gas sampling device, comprising a box body, a lining plate provided on the box body, a positioning mechanism provided on the lining plate, a detachable sampling cylinder provided on the positioning mechanism, an air inlet pipe and an air outlet pipe connected thereto provided on the lining plates at both ends of the sampling cylinder, characterized in that: The air inlet pipe and the air outlet pipe are respectively provided with an air inlet solenoid valve and an air outlet solenoid valve, the air inlet pipe between the air inlet solenoid valve and the sampling cylinder is provided with an air inlet exhaust pipe and an air inlet pressure gauge, the air outlet pipe between the air outlet solenoid valve and the sampling cylinder is provided with an air outlet exhaust pipe and an air outlet pressure gauge, the air inlet exhaust pipe and the air outlet exhaust pipe are provided with an air inlet exhaust solenoid valve and an air outlet exhaust solenoid valve, a control circuit is provided in the box, and the control circuit is electrically connected to the air inlet solenoid valve, the air outlet solenoid valve, the air inlet exhaust solenoid valve and the air outlet exhaust solenoid valve to control their opening and closing.

2. The easy-to-operate liquefied petroleum gas sampling device according to claim 1, characterized in that: The control circuit includes a sampling circuit, an emptying circuit, a locking circuit and an alarm circuit. The sampling circuit is electrically connected to the air inlet solenoid valve and the air outlet solenoid valve to control both to open for sampling. After sampling is completed, the emptying circuit controls the air inlet emptying solenoid valve and the air outlet emptying solenoid valve to open and discharge the gas between the sampling cylinder and the air inlet solenoid valve and the air outlet solenoid valve. The sampling circuit is interlocked with the emptying circuit.

3. The easy-to-operate liquefied petroleum gas sampling device according to claim 2, characterized in that: The positioning mechanism includes clamping blocks symmetrically arranged on both sides of the sampling cylinder, a slide groove is arranged on the lining plate, the clamping block is arranged in the slide groove, a rack is arranged at the lower end of the clamping block, a gear meshing with the two racks is arranged between the two racks, an operating knob coaxially connected to the gear is arranged on the front side of the lining plate, and an electromagnetic lock electrically connected to the locking circuit is arranged on the operating knob.

4. A convenient-to-operate liquefied petroleum gas sampling device according to claim 2 or 3, characterized in that: The air inlet pressure gauge and the air outlet pressure gauge are electric contact pressure gauges, and their normally closed output ends are electrically connected to the alarm circuit. When the sampling circuit is working, if any one of the air inlet pressure gauge and the air outlet pressure gauge fails to detect pressure, an alarm signal is output.

5. The easy-to-operate liquefied petroleum gas sampling device according to claim 4, characterized in that: When any one of the sampling circuit and the emptying circuit is in operation, or when any one of the inlet pressure gauge and the outlet pressure gauge detects pressure, the locking circuit outputs a locking signal.

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