Control circuit of portable synchronous sampler

Abstract

The utility model discloses a control circuit of a portable synchronous sampler. The control circuit comprises a sampling circuit and a power supply circuit forming a loop with the sampling circuit. The sampling circuit comprises a direct current double-end air pump M used for executing sampling, a mode switch K2 used for switching between automatic sampling and manual sampling, and a time relay normally open contact KT which is communicated with the direct current double-end air pump M in series in an automatic mode. The beneficial effects of the utility model are that: 1, through the implementation of the control circuit, the standby power supply and the charging power supply socket are arranged in the control circuit, so that the timely and simple switching and charging of the battery pack can be realized; and secondly, a circuit of the air pump unit has an automatic mode and a manual mode, so that the synchronism of gas samples sampled by the air treatment unit on a project site is effectively improved, and reliable gas samples are provided for project debugging.

Description

Technical Field

[0001] This utility model relates to the technical field of gas sample collection in environmental governance testing, and in particular to a control circuit for a portable synchronous sampler. Background Technology

[0002] In the field of air purification engineering for environmental governance, in order to accurately determine the purification efficiency of the project's treatment unit, especially during the debugging of project operating parameters, it is necessary to collect a large number of simultaneous air samples from the inlet and outlet of the treatment unit. Purchasing professional portable instruments is expensive, and they often only sample from a single outlet; furthermore, in the absence of power at the project site, the instrument's built-in battery pack often experiences power outages during sampling due to limited battery life, thus affecting the smooth progress of the sampling work. Researchers eagerly anticipate the availability of portable samplers that allow for simultaneous inlet and outlet air sampling, and the ability to quickly switch between backup power and the original battery pack via a simple power outlet in case of power failure, as well as the ability to provide emergency power to air pumps and mobile phones in emergency situations. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a control circuit for a portable synchronous sampler.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a control circuit for a portable synchronous sampler, including a sampling circuit with automatic or manual modes, and a power supply circuit forming a loop with the sampling circuit; the sampling circuit includes a DC dual-head air pump M for performing sampling, a mode switch K2 for switching between automatic and manual sampling, and a time relay KT coil and its normally open contact KT connected in series with the DC dual-head air pump M in automatic mode; the power supply circuit includes a built-in power supply branch and an external power supply branch connected in parallel, the built-in power supply branch having an internal... The circuit includes a battery pack U0, normally closed contacts KA11 and KA21, and a fuse FU1. The external power supply branch includes an external power socket U1, normally open contacts KA12 and KA23, and a fuse FU2. In the automatic or manual sampling mode, the DC dual-head air pump M is directly connected to the power supply circuit and is powered by an external power supply connected to the external power socket U1, which energizes the intermediate relay coil KA1. When the normally open contact KA12 closes, the normally closed contact KA11 opens simultaneously, completing the automatic switching between the built-in battery pack U0 and the external power supply.

[0005] Preferably, it includes a charging control circuit; the charging control circuit includes a switch W1 disposed between the sampling circuit and the power supply circuit, a first branch connected in parallel with the external power supply branch, and a second branch connected in parallel with the built-in power supply branch and then merging into the first branch; the first branch is provided with a switch W2 that can be synchronized with the switch W1 when switching, and the second branch is provided with a normally open contact KA14 and a normally open contact KA22; the normally closed contact KA11 is provided with a normally closed contact KA21 at its front end, and the normally open contact KA12 is provided with a normally closed contact KA23 at its front end.

[0006] Preferably, when powered by an external power source, with switches W1 and W2 in the charging position, normally open contacts KA14 and KA22 are closed, and normally closed contacts KA21 and KA23 are open. The second branch allows the simultaneous closure of normally open contacts KA14 and KA22, thus enabling the external power source to charge the internal battery pack U0.

[0007] Preferably, it includes an emergency circuit for emergency start-up of the DC dual-head air pump M; the emergency circuit is connected in series after the normally open contact KT and in parallel with the DC dual-head air pump M, and includes an emergency power interface U2, a fuse FU3 and a self-locking switch SB1.

[0008] Preferably, it includes a step-down circuit connected in parallel with the power supply circuit; the step-down circuit includes a self-locking switch SB2, a DC-DC step-down module, a fuse FU4, and a +5V output interface OU connected in series.

[0009] Preferably, when the switches W1 and W2 are simultaneously in the power supply position, the self-locking switch SB2 is closed, and the +5V output interface OU can supply +5V power to the outside.

[0010] Preferably, it includes an indicator circuit for indicating the overall operation of the control circuit; the indicator circuit includes an air pump operation indicator YL, a lighting lamp L, a built-in power indicator WL indicating the power supply of the internal power supply, an external power indicator RL indicating the external power supply status, and a charging indicator GL indicating the charging status.

[0011] Preferably, a switch K1 connected in series is provided on the branch of the lighting lamp L.

[0012] Preferably, the branch of the built-in power indicator light WL is provided with normally closed contacts KA13 and KA25 connected in series.

[0013] Preferably, both the built-in power supply branch and the external power supply branch are equipped with an emergency stop mushroom switch JT for emergency power cut-off.

[0014] The beneficial effects of this utility model are as follows: First, through the implementation of the control circuit, there are backup power and charging power sockets in the control circuit, which can realize timely and easy switching and charging of the battery pack; Second, the circuit of the air pump unit has automatic and manual modes, which effectively improves the synchronization of the air samples sampled by the air handling unit at the project site and provides reliable air samples for project commissioning. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the control circuit of the portable synchronous sampler described in this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0017] Example 1

[0018] To address the challenges of simultaneous sampling at the inlet and outlet of air treatment units in air purification and deodorization systems at sewage treatment plants, sewage pumping stations, and chemical industrial parks, and the high cost and short battery life of specialized portable instruments, which are unsuitable for the actual sampling work conditions.

[0019] Reference Figure 1 As illustrated, this embodiment proposes a control circuit for a portable synchronous sampler, including a sampling circuit with automatic or manual modes and a power supply circuit forming a loop with the sampling circuit, the power supply circuit supplying power to the sampling circuit. Specifically, the sampling circuit includes a DC dual-head air pump M-1, a mode switch K2-2, a time relay KT coil-3, and a normally open contact KT-4. The DC dual-head air pump M-1 is used to perform sampling, and the mode switch K2-2 has three positions: automatic, manual, and stop, used to switch between the automatic / manual / stop sampling modes.

[0020] When the setting mode switch K2-2 is in the automatic position, the time relay KT coil-3 is energized. Under the control of the time relay KT-3, the DC dual-head air pump M-1 achieves automatic intermittent sampling by opening and closing the normally open contact KT-4 connected in series with the DC dual-head air pump M-1.

[0021] When the setting mode switch K2-2 is in the manual position, the DC dual-head air pump M-1 directly forms a circuit with the power supply circuit, and the DC dual-head air pump M-1 is in a state of continuous operation.

[0022] When the setting mode switch K2-2 is in the stop position, the DC dual-head air pump M-1 is in a stopped sampling state because it is not powered.

[0023] It should be noted that the DC dual-head air pump M-1 is a dual-sampling-port air pump. By setting the gas pipes connected to the sampling ports at both ends of the air handling unit equipment to be of the same length, it is possible to simultaneously extract and collect air from the inlet and outlet of the air handling unit equipment.

[0024] In one embodiment, when collecting gas samples, the DC dual-head air pump M-1 is turned on for several minutes to expel air from the gas pipeline; the inlet gas sample is collected first, and after the processing unit's dwell time has elapsed, the outlet gas sample is collected.

[0025] In one embodiment, to enable the power supply circuit to be powered by an external power source when the built-in battery pack circuit is insufficient or an external power supply is required, the power supply circuit includes a built-in power supply branch and an external power supply branch connected in parallel. The built-in power supply branch is equipped with a built-in battery pack U0-5 and normally closed contacts KA11-8 and KA21-12. The external power supply branch is equipped with an external power socket U1-6 and normally open contacts KA12-9 and KA23-13. Both the internal and external power supply branches are connected in series with a fuse FU1 and an emergency stop switch JT-30. The mode switch K2-2 is a three-point toggle switch (also known as a toggle switch), which physically switches the circuit path to select whether the time relay KT coil-3 is connected. When mode switch K2-2 is switched to manual mode, the DC dual-head air pump M-1 is directly connected to the power supply circuit and runs continuously. When mode switch K2-2 is switched to automatic mode, the normally open contact KT-4 is connected in series with the DC dual-head air pump M-1, and the air pump is controlled to start and stop by setting the time interval of the time relay KT coil-3 to achieve timed sampling. When an external power supply is plugged in, the normally open contact KA12-9 closes, and the normally closed contact KA11-8 opens, and the power supply automatically switches to external power supply. When there is no external power supply, the built-in battery pack U0-5 is powered through the fuse FU1, the normally closed contact of the emergency stop mushroom switch JT-30, the normally closed contact KA11-8, and the normally closed contact KA21-12.

[0026] In actual scenarios, when powered by the built-in battery pack U0-5, the normally closed contact KA11-8 closes and the normally open contact KA12-9 opens. The circuit breaker FU1 of the built-in power supply branch containing the built-in battery pack U0-5, the normally closed contact of the emergency stop mushroom switch JT-30, and the sampling circuit form a loop. When there is an external power supply (including a spare battery pack and a 220V to DC adapter for the air pump), the normally open contact KA12-9 closes under the control of the intermediate relay KA1. At this time, the normally closed contact KA11-8 opens, the built-in battery pack U0-5 and the sampling circuit are disconnected, and the fuse FU2 of the external power supply branch containing the external power socket U1-6, the normally closed contact of the emergency stop mushroom switch JT-30, and the sampling circuit form a loop. At this time, the DC dual-head air pump M-1 preferentially selects the external power supply for power supply.

[0027] Example 2

[0028] To enable charging of the built-in battery pack U0-5 in the above embodiments, a charging control circuit is proposed to achieve simultaneous external power supply and charging through the external power socket U1-6.

[0029] Specifically, the charging control circuit includes a switch W1-15 located between the sampling circuit and the power supply circuit, a first branch-S1 connected in parallel with the external power supply branch, and a second branch-S2 connected in parallel with the built-in power supply branch and then merged into the first branch-S1; wherein the first branch-S1 is equipped with a switch W2-16 that is synchronously controlled with the switch W1-15 (in this embodiment, the functions of the two can be achieved using a three-position two-section changeover switch), the second branch-S2 is equipped with normally open contacts KA14-10 and KA22-14; a normally closed contact KA21-12 is provided in front of the normally closed contact KA11-8, and a normally closed contact KA23-13 is provided in front of the normally open contact KA12-9.

[0030] Refer again Figure 1 The diagram shows the circuit structure of the control circuit in the charging state. When an external power supply is supplied through the external power socket U1(6), when the switches W1-15 and W2-16 are simultaneously in the charging position, the intermediate relay coils KA1-7 and KA2-11 are energized, so the normally open contacts KA14-10 and KA22-14 are both energized. At the same time, the normally closed contacts KA21-12 and KA23-13 are both open, and the normally closed contact KA11-8 is open and the normally open contact KA12-9 is closed. In this state, the external power supply branch and the internal power supply branch are connected in parallel, and both are open from the sampling circuit. When the external power supply is connected, the built-in battery pack U0-5 can be charged.

[0031] In this embodiment, when the synchronous control of switches W1-15 and W2-16 switches is switched to the charging position, normally open contacts KA14-10 and KA22-14 are both energized to charge the built-in battery pack U0-5; at the same time, normally closed contacts KA21-12 and KA23-13 are opened to isolate the sampling circuit and ensure that the sampling circuit is de-energized during charging.

[0032] Example 3

[0033] To enable the DC dual-head air pump M-1 to be used in case the built-in battery pack U0-5 and the external power socket U1-6 are unusable due to malfunction, this embodiment includes an emergency circuit for emergency startup of the DC dual-head air pump M-1.

[0034] Specifically, the emergency circuit is connected in series after the normally open contact KT-4 and in parallel with the DC dual-head air pump M-1. It includes an emergency power interface U2-17, a fuse FU3, and a self-locking switch SB1-18. Because it is connected in series after the normally open contact KT-4, the DC dual-head air pump M-1 can be directly powered by the emergency power interface U2-17 regardless of whether the mode switch K2-2 is in the automatic or manual position. At the same time, whether the time relay KT coil-3 is faulty or not will not affect the normal start-up of the DC dual-head air pump M-1, thus ensuring the normal operation of the sampling work.

[0035] In actual use, when the built-in battery pack U0-5 and the external power socket U1-6 fail, first switch W1-15 and switch W2-16 to the power off position, then insert the emergency power supply into the emergency power interface U2-17, and press the self-locking switch SB1-18 to directly drive the DC dual-head air pump M-1 for sampling.

[0036] Example 4

[0037] To enable the control circuit of the portable synchronous sampler to supply a low DC voltage, this embodiment includes a step-down circuit connected in parallel with the power supply circuit.

[0038] Specifically, the step-down circuit includes a self-locking switch SB2-19, a DC-DC step-down module DC-DC-20, and a +5V output interface OU-21 connected in series. Only when switches W1-15 and W2-16 are simultaneously in the power supply position, pressing the self-locking switch SB2-19 closes the circuit, and the +5V output interface OU-21 can provide a low-voltage DC voltage.

[0039] In one embodiment, the DC-DC-20 step-down module can be a 5V step-down voltage circuit, and the +5V output interface OU-21 can be a 5V output interface. The specific voltage can be set according to the actual needs of the scenario. The +5V output interface OU-21 can be set as a mobile phone Type-C charging interface or a USB interface.

[0040] In the usage scenario, when switches W1-15 and W2-16 are switched to the power supply position, pressing the self-locking switch SB2-19 activates the DC-DC-20 step-down module, which converts the battery voltage into standard output low-voltage DC power to the +5V output interface OU-21 for charging external devices.

[0041] The input terminal of the DC-DC-20 step-down module is directly connected to the built-in battery pack U0-5, and the output is controlled by the on / off switch SB2-19, which can realize the control of external low-voltage power supply. By inserting a fuse FU3 in series between the DC-DC-20 step-down module and the +5V output interface OU-21, the overcurrent protection of the +5V output interface OU-21 can be realized.

[0042] Example 5

[0043] To indicate the overall operating status of the control circuit of the portable synchronous sampler, an indicator circuit is provided in this embodiment for indicating the overall operating status of the control circuit. In addition, an illumination circuit is provided in this embodiment to facilitate nighttime sampling.

[0044] When switches W1-15 and W2-16 are simultaneously in the power supply position:

[0045] Specifically, the indicator circuit includes an air pump operation indicator YL-22 for indicating the working status of the DC dual-head air pump M-1, a lighting lamp L-23, a built-in power indicator WL-24 for indicating the power supply status of the built-in battery, an external power indicator RL-25 for indicating the power supply status of the external power supply, and a charging indicator GL-26 for indicating the charging status.

[0046] The branch circuit of the built-in power indicator light WL-24 is equipped with normally closed contacts KA13-28 and KA25-29 connected in series. The branch circuit of the lighting lamp L-23 is equipped with a switch K1-27 connected in series.

[0047] When powered by the built-in battery pack U0-5, the intermediate relay coils KA1-7 and KA2-11 are not powered and therefore do not work. At this time, the normally closed contacts KA13-28 and KA25-29, which are connected in series on the branch of the built-in power indicator light WL-24, are closed. The built-in power indicator light WL-24 is powered on and illuminates, indicating that the built-in battery pack U0-5 is powered.

[0048] When an external power source (a backup battery pack or a 220V to DC adapter matched with a DC dual-head air pump) supplies power through the external power socket U1-6, the intermediate relay coil KA1-7 is energized. At this time, the normally closed contact KA13-28, which is connected in series on the branch of the built-in power indicator light WL-24, is disconnected, and the built-in power indicator light WL-24 is de-energized and goes out. Simultaneously, the external power supply illuminates the external power indicator light RL-25 through the fuse FU2, the normally closed contact of the emergency stop mushroom switch JT-30, and the normally closed contact KA23-13, thus indicating that an external power supply is in effect.

[0049] When an external power source supplies power through the external power socket U1-6, and switches W1-15 and W2-16 are simultaneously in the charging position, the intermediate relay coils KA1-7 and KA2-11 are energized. Therefore, normally open contacts KA14-10 and KA22-14 are both closed, while normally closed contacts KA21-12 and KA23-13 are open, normally closed contact KA11-5 is open, and normally open contact KA12-9 is closed. In this state, the external power supply branch and the internal power supply branch are connected in parallel, and both are open from the sampling circuit. The internal battery pack U0-5 can be charged when an external power source is connected. When the intermediate relay coil KA2-11 is energized, the charging indicator light GL-26 will illuminate because it is connected in parallel with the intermediate relay coil KA2-11, indicating that the battery is charging. At the same time, because the normally closed contact KA23-13 is open, the external power indicator light RL-25 is de-energized and goes out.

[0050] In one embodiment, both the built-in power supply branch and the external power supply branch are equipped with an emergency stop mushroom switch JT-30, which is used to cut off the power supply in case of a fault in the sampling, lighting or step-down circuit, so as to reduce the losses caused by the fault.

[0051] In one embodiment, fuses FU are provided in the built-in power supply branch, the external power supply branch, the step-down circuit, and the emergency circuit for circuit protection.

[0052] The above describes the composition structure of the control circuit for a portable synchronous sampler proposed in this embodiment. Based on the above structure, this embodiment also describes the circuit structure formation under various operating states of the basic circuit structure, that is, the implementation of the circuit structure under different operating states. The circuit schematic numbers and names involved in this embodiment are shown in Table 1 below.

[0053] Explanation of reference numerals: In this application, the part before the "-" is the name and symbol of each component, and the part after the "-" is the reference numeral number in the accompanying drawings. Figure 1 The reference numerals in the attached figures are enclosed in parentheses.

[0054] Explanation of the contact numbering for intermediate relay KA: KAX X In the diagram, "X" represents the intermediate relay number, and "X" represents the contact. Odd numbers such as 1, 3, and 5 represent normally closed contacts, while even numbers such as 2 and 4 represent normally open contacts.

[0055] Table 1: Component numbers, names, and symbols.

[0056]

[0057]

[0058] It should be noted that this application aims to provide a control circuit for a portable synchronous sampler. Its core essence lies in the circuit's structural layout, which is a structural component and connection. As for its functional implementation principle and control function implementation, these are all existing and very mature technologies. For example, the working principle of the DC dual-head air pump M-1, how gas sampling is achieved, the control principle of the time relay KT coil-3, the voltage reduction principle of the DC-DC-20 step-down module, the self-implementation principle of the fuse FU, the implementation principle of the contact switch, etc. The above are just examples of technical issues. Of course, there should also be other technical issues that are the same as or similar to the above, all of which are existing and very mature technologies. The technical features corresponding to the technical problems to be solved are also non-essential technical features of this application. When judging whether this application is sufficiently disclosed, it should not deviate from the core essence. Therefore, it will not be described in detail.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of protection of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description and ideas. It is neither necessary nor possible to exhaustively describe all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the technical solution of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A control circuit for a portable synchronous sampler, characterized in that: Includes a sampling circuit with automatic or manual modes, and a power supply circuit that forms a loop with the sampling circuit; The sampling circuit includes a DC dual-head air pump M(1) for performing sampling, a mode switch K2(2) for switching between automatic and manual sampling, and a time relay coil KT (3) and its normally open contact KT (4) connected in series with the DC dual-head air pump M(1) in automatic mode. The power supply circuit includes a built-in power supply branch and an external power supply branch connected in parallel. The built-in power supply branch is equipped with a built-in battery pack U0 (5), a normally closed contact KA11 (8), a normally closed contact KA21 (12) and a fuse FU1. The external power supply branch is equipped with an external power socket U1 (6), a normally open contact KA12 (9), a normally closed contact KA23 (13) and a fuse FU2. In the automatic or manual sampling mode, the DC dual-head air pump M(1) is directly connected to the power supply circuit and is powered by the external power supply socket U1(6) connected to the external power supply, so that the intermediate relay coil KA1(7) is energized. When the normally open contact KA12(9) is closed, the normally closed contact KA11(8) is opened at the same time, thus completing the automatic switching between the built-in battery pack U0(5) and the external power supply.

2. The control circuit of the portable synchronous sampler according to claim 1, characterized in that: Includes charging control circuitry; The charging control circuit includes a switch W1 (15) located between the sampling circuit and the power supply circuit, a first branch (S1) connected in parallel with the external power supply branch, and a second branch (S2) connected in parallel with the built-in power supply branch and then merged into the first branch (S1). The first branch (S1) is provided with a switch W2 (16) that can be synchronized with the switch W1 (15) when switching, and the second branch (S2) is provided with a normally open contact KA14 (10) and a normally open contact KA22 (14); The normally closed contact KA11(8) has a normally closed contact KA21(12) at its front end, and the normally open contact KA12(9) has a normally closed contact KA23(13) at its front end.

3. The control circuit of the portable synchronous sampler according to claim 2, characterized in that: When powered by an external power source, the normally open contacts KA14 (10) and KA22 (14) are closed when the switches W1 (15) and W2 (16) are in the charging position, and the normally closed contacts KA21 (12) and KA23 (13) are open. By having the normally open contact KA14 (10) and the normally open contact KA22 (14) of the second branch (S2) close simultaneously, the external power supply can charge the built-in battery pack U0 (5).

4. The control circuit of the portable synchronous sampler according to claim 1, characterized in that: Includes an emergency circuit for emergency start-up of the DC dual-head air pump M(1); The emergency circuit is connected in series behind the normally open contact KT(4) and in parallel with the DC dual-head air pump M(1), and includes an emergency power interface U2(17), a fuse FU3 and a self-locking switch SB1(18).

5. The control circuit of the portable synchronous sampler according to claim 2, characterized in that: Includes a step-down circuit connected in parallel with the power supply circuit; The step-down circuit includes a self-locking switch SB2 (19), a DC-DC step-down module (20), a fuse FU4, and a +5V output interface OU (21) connected in series.

6. The control circuit of the portable synchronous sampler according to claim 5, characterized in that: When the switches W1 (15) and W2 (16) are simultaneously in the power supply position, the self-locking switch SB2 (19) is closed, and the +5V output interface OU (21) can supply +5V power to the outside.

7. The control circuit of the portable synchronous sampler according to claim 1, characterized in that: Includes an indicator circuit for indicating the overall operation of the control circuit; The indicator circuit includes an air pump operation indicator YL (22), a lighting lamp L (23), a built-in power indicator WL (24) indicating the internal power supply, an external power indicator RL (25) indicating the external power supply status, and a charging indicator GL (26) indicating the charging status.

8. The control circuit of the portable synchronous sampler according to claim 7, characterized in that: A series switch K1 (27) is provided on the branch of the lighting lamp L (23).

9. The control circuit of the portable synchronous sampler according to claim 7, characterized in that: The built-in power indicator light WL(24) has normally closed contacts KA13(28) and KA25(29) connected in series on its branch.

10. The control circuit of the portable synchronous sampler according to claim 1, characterized in that: Both the built-in power supply branch and the external power supply branch are equipped with emergency stop mushroom switches JT(30) for emergency power cut-off.

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