Mixing ratio self-adjusting detector

Abstract

The utility model relates to the technical field of detection instruments, and provides a self-adjusting mixing ratio detector, which comprises an instrument body, a gas inlet and a gas outlet, one end of the air inlet mechanism is communicated with an air source, and the other end is connected with the air inlet end of the detection air cavity; one end of the exhaust mechanism is connected with the exhaust end of the detection air cavity; the gas collecting mechanism is connected with the other end of the exhaust mechanism through the self-adjusting mechanism; one part of the self-adjusting mechanism is arranged in the exhaust mechanism, a reference gas cavity is formed in the self-adjusting mechanism, and the self-adjusting mechanism can be switched between a conduction state and a cut-off state. The self-adjusting mixing ratio detector provided by the utility model can automatically switch to a conducting state when detecting that the air pressure in the detection air cavity is greater than the air pressure in the reference air cavity, so as to maintain the pressure of the detection air cavity to be standard atmospheric pressure; when the air pressure in the detection air cavity is smaller than or equal to the air pressure in the reference air cavity, the detection air cavity is automatically switched to a cut-off state to prevent the pressure in the detection air cavity from being too low to influence the detection result.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection instrument technical field especially relates to a kind of self-regulating mixed ratio detector. BACKGROUND

[0002] High-voltage gas insulation equipment, especially circuit breaker, often uses SF6 (sulfur hexafluoride) as main insulation and arc-extinguishing medium. However, in the case of atmospheric pressure lower than standard atmospheric pressure and lower temperature, SF6 gas is easy to liquefy at low temperature, thereby affecting its insulation and arc-extinguishing performance. To solve this problem, a certain proportion of CF4 (carbon tetrafluoride) gas is usually mixed into SF6 gas to reduce the overall liquefaction temperature of the mixed gas and improve the reliability of the equipment. SF6 / CF4 mixed gas insulation equipment needs to be detected for mixed ratio in operation, handover, gas charging and other links to ensure its stable performance. The existing mixed ratio detection methods mainly include infrared spectroscopy and thermal conductivity method. Both methods rely on the number of gas molecules to be detected in the detection cell, and then determine the mixed ratio by outputting the amplitude of the electrical signal of the detection module. However, both methods are affected by environmental pressure in actual application.

[0003] Specifically, if the SF6 / CF4 mixed gas mixed ratio detector calibrated at standard atmospheric pressure is placed in a high-altitude low-pressure atmospheric environment for detection, the number of gas molecules to be detected in the detection cell will decrease accordingly due to the lower environmental pressure than the pressure at the time of calibration, resulting in a decrease in the amplitude of the electrical signal output by the detection module, and thus an increase in the error of the mixed ratio detection result. SUMMARY

[0004] The utility model provides a kind of self-regulating mixed ratio detector to solve the problem that the number of gas molecules to be detected in the detection cell will decrease accordingly due to the lower environmental pressure than the pressure at the time of calibration, resulting in a decrease in the amplitude of the electrical signal output by the detection module, and thus an increase in the error of the mixed ratio detection result.

[0005] The utility model provides a kind of self-regulating mixed ratio detector, comprising:

[0006] An instrument body is formed with a detection gas cavity;

[0007] A gas inlet mechanism is connected to a gas source at one end and to a gas inlet end of the detection gas cavity at the other end;

[0008] An exhaust mechanism is connected to an exhaust end of the detection gas cavity at one end;

[0009] A gas collection mechanism and a self-regulating mechanism are connected to the other end of the exhaust mechanism through the self-regulating mechanism;

[0010] Part of the self-adjusting mechanism is arranged in the exhaust mechanism and is formed with a reference air cavity, and the self-adjusting mechanism can be switched between a conducting state and a cut-off state;

[0011] When the air pressure in the reference air cavity is less than or equal to the air pressure in the detection air cavity, the self-adjusting mechanism is switched to the conducting state, and the gas collecting mechanism is communicated with the exhaust mechanism through the self-adjusting mechanism; when the air pressure in the reference air cavity is greater than the air pressure in the detection air cavity, the self-adjusting mechanism is switched to the cut-off state, and the self-adjusting mechanism cuts off the gas collecting mechanism and the exhaust mechanism.

[0012] According to the self-adjusting mixed ratio detector provided by the utility model, the self-adjusting mechanism comprises:

[0013] The adjusting module is arranged in the exhaust mechanism and is formed with the reference air cavity;

[0014] The electromagnetic valve is connected between the gas collecting mechanism and the exhaust mechanism;

[0015] When the air pressure in the reference air cavity is less than or equal to the air pressure in the detection air cavity, the adjusting module controls the electromagnetic valve to communicate the gas collecting mechanism and the exhaust mechanism;

[0016] When the air pressure in the reference air cavity is greater than the air pressure in the detection air cavity, the adjusting module controls the electromagnetic valve to cut off the gas collecting mechanism and the exhaust mechanism.

[0017] According to the self-adjusting mixed ratio detector provided by the utility model, the adjusting module comprises:

[0018] The shell is provided with a notch on one side, the notch is provided with an elastic diaphragm, and the elastic diaphragm cooperates with the shell to form the reference air cavity;

[0019] The conductive part is arranged on the elastic diaphragm;

[0020] The contact switch is arranged in the reference air cavity;

[0021] When the air pressure in the reference air cavity is less than or equal to the air pressure in the detection air cavity, the elastic diaphragm is driven to contract and drive the conductive part to contact the contact switch, so that the electromagnetic valve communicates the gas collecting mechanism and the exhaust mechanism;

[0022] When the air pressure in the reference air cavity is greater than the air pressure in the detection air cavity, the elastic diaphragm is driven to expand and drive the conductive part to separate from the contact switch, so that the electromagnetic valve cuts off the gas collecting mechanism and the exhaust mechanism.

[0023] The utility model provides a kind of self-regulating mixed ratio detector, the adjusting module further includes:

[0024] Supporting rod is connected with the shell, and is arranged in the reference gas cavity.

[0025] According to the self-regulating mixed ratio detector provided by the utility model, when the air pressure in the reference gas cavity is less than or equal to the air pressure in the detection gas cavity, the elastic film is arranged in a plane at the notch; when the air pressure in the reference gas cavity is greater than the air pressure in the detection gas cavity, the elastic film is arranged in a hemispherical shape at the notch.

[0026] According to the self-regulating mixed ratio detector provided by the utility model, when the self-regulating mechanism switches to the conducting state, the pressure in the reference gas cavity is one standard atmospheric pressure.

[0027] According to the self-regulating mixed ratio detector provided by the utility model, the air inlet mechanism includes an adjusting valve and a flowmeter; the air source is communicated with the air inlet end of the detection gas cavity through the adjusting valve and the flowmeter.

[0028] According to the self-regulating mixed ratio detector provided by the utility model, the air inlet mechanism further includes:

[0029] Air inlet pipeline is connected between the air source and the air inlet end of the detection gas cavity, and the adjusting valve and the flowmeter are arranged on the air inlet pipeline.

[0030] According to the self-regulating mixed ratio detector provided by the utility model, the air outlet mechanism includes:

[0031] Air outlet pipeline is connected between the air outlet end of the detection gas cavity and the air collection mechanism.

[0032] According to the self-regulating mixed ratio detector provided by the utility model, the self-regulating mixed ratio detector further includes:

[0033] Detection module is arranged in the detection gas cavity, and is used for detecting the gas in the detection gas cavity.

[0034] The self-adjusting mixed ratio detector can automatically switch to the conducting state when detecting that the air pressure in the detection cavity is greater than the air pressure in the reference cavity, and the gas collecting mechanism and the air exhausting mechanism are communicated through the self-adjusting mechanism to maintain the pressure of the detection cavity as the standard atmospheric pressure; when the air pressure in the detection cavity is less than or equal to the air pressure in the reference cavity, the self-adjusting mixed ratio detector automatically switches to the cut-off state, and the connection between the gas collecting mechanism and the air exhausting mechanism is cut off to prevent the pressure in the detection cavity from being too low and affecting the detection result. Through the self-adjusting mechanism, it can be ensured that the detector can accurately measure the mixed ratio of SF6 / CF4 mixed gas under different altitudes and air pressure environments. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0036] Figure 1 is a schematic view of the self-adjusting mixed ratio detector provided by the present application.

[0037] Figure 2 is a schematic view of the self-adjusting mechanism provided by the present application.

[0038] Reference signs:

[0039] 1, air inlet pipeline; 2, regulating valve; 3, flowmeter; 4, detection cavity; 5, air outlet pipeline; 6, self-adjusting mechanism; 61, elastic diaphragm; 62, conductive part; 63, supporting rod; 64, contact switch; 65, reference cavity; 7, electromagnetic valve; 8, gas collecting bag. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0041] The self-adjusting mixed ratio detector of the present application will be described below in combination with Figure 1 and Figure 2 The self-adjusting mixed ratio detector of the present application is mainly used for detecting SF6 / CF4 mixed gas.

[0042] In some embodiments, such as Figure 1As shown, the self-adjusting mixing ratio detector includes an instrument body, an air inlet mechanism, an air outlet mechanism, a gas collection mechanism, and a self-adjusting mechanism 6. The instrument body forms a detection gas cavity 4; one end of the air inlet mechanism is connected to the gas source, and the other end is connected to the air inlet end of the detection gas cavity 4; one end of the air outlet mechanism is connected to the air outlet end of the detection gas cavity 4; the gas collection mechanism can use a gas collection bag 8, which is connected to the other end of the air outlet mechanism through the self-adjusting mechanism 6; part of the self-adjusting mechanism 6 is arranged in the air outlet mechanism, and a reference gas cavity 65 is formed therein. The self-adjusting mechanism 6 can be switched between the on state and the off state; when the air pressure in the reference gas cavity 65 is less than or equal to the air pressure in the detection gas cavity 4, the self-adjusting mechanism 6 switches to the on state, and the gas collection mechanism is connected to the air outlet mechanism through the self-adjusting mechanism 6; when the air pressure in the reference gas cavity 65 is greater than the air pressure in the detection gas cavity 4, the self-adjusting mechanism 6 switches to the off state, and the self-adjusting mechanism 6 disconnects the gas collection mechanism from the air outlet mechanism.

[0043] In this embodiment, the instrument body is the main part of the detector, and the detection gas cavity 4 is formed inside. The detection gas cavity 4 is the main space for detecting the mixed gas, and its design needs to consider factors such as gas flow, mixing uniformity, and detection accuracy.

[0044] The air inlet mechanism is responsible for introducing the gas (or mixed gas) to be detected from the external gas source into the detection gas cavity 4. One end of it is connected to the gas source, and the other end is tightly connected to the air inlet end of the detection gas cavity 4, ensuring that the gas can smoothly and stably enter the detection gas cavity 4. The air outlet mechanism is connected to the air outlet end of the detection gas cavity 4 and is responsible for discharging the gas after detection or excess gas from the system. Its design needs to consider factors such as exhaust efficiency, gas leakage control, and environmental impact. The gas collection mechanism is connected to the air outlet mechanism through the self-adjusting mechanism 6, which is used to collect or process the gas after detection. This can be customized according to actual needs, such as collecting waste gas for harmless treatment, or collecting useful gas for subsequent use. The self-adjusting mechanism 6 can automatically switch states under certain conditions, thereby achieving precise control of gas flow. The self-adjusting mechanism 6 contains a reference gas cavity 65, and the change in air pressure in this cavity is used to trigger the switching of states.

[0045] When the air pressure in the reference gas cavity 65 is less than or equal to the air pressure in the detection gas cavity 4, the self-adjusting mechanism 6 switches to the on state. At this time, the gas collection mechanism is connected to the air outlet mechanism through the self-adjusting mechanism 6, allowing the gas to be smoothly discharged.

[0046] When the air pressure in the reference gas cavity 65 is greater than the air pressure in the detection gas cavity 4, the self-adjusting mechanism 6 switches to the off state, disconnecting the gas collection mechanism from the air outlet mechanism. At this time, the gas continues to be introduced, which can increase the air pressure in the detection gas cavity 4, avoiding the situation that the air pressure in the detection gas cavity 4 is too low, affecting the detection result.

[0047] The self-adjusting mixed ratio detector can be switched to the conducting state automatically when the air pressure in the detection cavity is greater than the air pressure in the reference cavity, and the gas collecting mechanism and the gas exhausting mechanism are communicated through the self-adjusting mechanism to maintain the pressure in the detection cavity as the standard atmospheric pressure; when the air pressure in the detection cavity is less than or equal to the air pressure in the reference cavity, the self-adjusting mixed ratio detector is switched to the cut-off state automatically, and the connection between the gas collecting mechanism and the gas exhausting mechanism is cut off to prevent the pressure in the detection cavity from being too low and affecting the detection result. The self-adjusting mechanism is arranged, and the detector can accurately measure the mixed ratio of SF6 / CF4 mixed gas under different altitudes and air pressure environments.

[0048] In some embodiments, as shown in Figure 1 and Figure 2 The self-adjusting mechanism 6 includes an adjusting module and an electromagnetic valve 7. The adjusting module is arranged in the gas exhausting mechanism and is formed with a reference cavity 65; the electromagnetic valve 7 is connected between the gas collecting mechanism and the gas exhausting mechanism; when the air pressure in the reference cavity 65 is less than or equal to the air pressure in the detection cavity 4, the adjusting module controls the electromagnetic valve 7 to communicate the gas collecting mechanism and the gas exhausting mechanism; when the air pressure in the reference cavity 65 is greater than the air pressure in the detection cavity 4, the adjusting module controls the electromagnetic valve 7 to cut off the connection between the gas collecting mechanism and the gas exhausting mechanism.

[0049] Specifically, the adjusting module is arranged in the gas exhausting mechanism, and the adjusting module is internally formed with the reference cavity 65, which is used to compare the air pressure in the detection cavity 4. Through a pressure sensor or a mechanical structure (such as a diaphragm, a piston, etc.), the adjusting module can monitor the air pressure difference between the reference cavity 65 and the detection cavity 4 in real time.

[0050] According to the air pressure relationship between the reference cavity 65 and the detection cavity 4, the adjusting module will send a corresponding control signal. Specifically, when the air pressure in the reference cavity 65 is less than or equal to the air pressure in the detection cavity 4, the adjusting module controls the electromagnetic valve 7 to enter the communicating state; and when the air pressure in the reference cavity 65 is greater than the air pressure in the detection cavity 4, the electromagnetic valve 7 is controlled to be cut off.

[0051] The electromagnetic valve 7 is connected between the gas collecting mechanism and the gas exhausting mechanism and is used to adjust and control the gas flow path. The electromagnetic valve 7 can switch its working state according to the received control signal (from the adjusting module). In the communicating state, the electromagnetic valve 7 allows the gas to flow smoothly from the gas exhausting mechanism to the gas collecting mechanism; and in the cut-off state, the gas flow is prevented to improve the pressure in the detection cavity 4.

[0052] In this embodiment, as shown in Figure 2As shown, the adjustment module includes a housing, a conductive piece 62 and a contact switch 64. One side of the housing is provided with a notch, and an elastic film 61 is arranged at the notch to form a reference air cavity 65 with the housing; the conductive piece 62 is arranged on the elastic film 61; the contact switch 64 is arranged in the reference air cavity 65; when the air pressure in the reference air cavity 65 is less than or equal to the air pressure in the detection air cavity 4, the elastic film 61 is contracted to drive the conductive piece 62 to contact the contact switch 64, so as to make the electromagnetic valve 7 connect the air collecting mechanism and the air exhausting mechanism; when the air pressure in the reference air cavity 65 is greater than the air pressure in the detection air cavity 4, the elastic film 61 is expanded to drive the conductive piece 62 to separate from the contact switch 64, so as to make the electromagnetic valve 7 cut off the connection between the air collecting mechanism and the air exhausting mechanism.

[0053] Specifically, the housing is the main structure of the adjustment module, which is used to protect the internal components and provide the necessary mechanical support. One side of the housing is provided with a notch, which not only facilitates the installation and positioning of the elastic film 61, but also allows the external air pressure to act on the elastic film 61 through the notch. The elastic film 61 is arranged at the notch and tightly cooperates with the housing to form the reference air cavity 65 together. The elastic film 61 has good elasticity and sealing performance and can deform according to the change of air pressure. Specifically, when the air pressure in the reference air cavity 65 is less than or equal to the air pressure in the detection air cavity 4, the elastic film 61 will contract inward; and when the air pressure in the reference air cavity 65 is greater than the air pressure in the detection air cavity 4, the elastic film 61 will expand outward. The conductive piece 62 is arranged on the elastic film 61 and can displace with the deformation of the elastic film 61.

[0054] The conductive piece 62 plays a role in transmitting electrical signals in the adjustment module. When it contacts the contact switch 64, a closed circuit is formed, thereby triggering the connection action of the electromagnetic valve 7; and when it separates from the contact switch 64, the circuit is disconnected, and the electromagnetic valve 7 is cut off.

[0055] The contact switch 64 is arranged in the reference air cavity 65 and corresponds to the conductive piece 62. When the conductive piece 62 contacts the contact switch 64, the contact switch 64 is activated to send a control signal to make the electromagnetic valve 7 connect the air collecting mechanism and the air exhausting mechanism; and when the conductive piece 62 separates from the contact switch 64, the control signal disappears, and the electromagnetic valve 7 is cut off.

[0056] A certain amount of air is pre-pumped into the reference gas chamber 65. When using the self-adjusting mixture ratio detector, the gas to be tested is introduced through the air intake mechanism and enters the detection gas chamber 4 for testing. During the testing process, when the air pressure in the reference gas chamber 65 is less than or equal to the air pressure in the detection gas chamber 4, the elastic diaphragm 61 contracts inward, driving the conductive element 62 to move towards the contact switch 64 and eventually contact it. At this time, the circuit is closed, the solenoid valve 7 receives the control signal and connects the gas collecting mechanism and the gas venting mechanism, allowing the gas to flow out smoothly. When the air pressure in the reference gas chamber 65 is greater than the air pressure in the detection gas chamber 4, the elastic diaphragm 61 expands outward, driving the conductive element 62 to separate from the contact switch 64. At this time, the circuit is disconnected, the solenoid valve 7 receives the control signal and cuts off the connection between the gas collecting mechanism and the gas venting mechanism, preventing gas flow and preventing the pressure in the detection gas chamber 4 from being too low and affecting the test results.

[0057] It should be noted that the outer shell is located in the pipe between the exhaust pipe 5 and the air collection bag 8, and the elastic membrane 61 is located therebetween. The deformation of the elastic membrane 61 can be adjusted by the pressure of the two parts.

[0058] When the air pressure in the reference air chamber 65 is less than or equal to the air pressure in the exhaust pipe 5, the elastic membrane 61 contracts inward, allowing gas to pass through the corresponding pipe. When the air pressure in the reference air chamber 65 is greater than the air pressure in the exhaust pipe 5, the elastic membrane 61 expands outward, blocking the corresponding pipe to some extent.

[0059] In this embodiment, as Figure 2 As shown, the adjustment module also includes a support rod 63. The support rod 63 is connected to the housing and is disposed within the reference air chamber 65. The contact switch 64 is mounted on the support rod 63. The support rod 63 provides a stable mounting platform for the contact switch 64, preventing displacement or damage caused by external factors such as air pressure changes or vibration. By precisely controlling the position and length of the support rod 63, the relative positional relationship between the contact switch 64 and the conductive element 62 can be ensured, thereby affecting the sensitivity and accuracy of the contact or separation between the conductive element 62 and the contact switch 64.

[0060] When the air pressure in the reference air chamber 65 is less than or equal to the air pressure in the detection air chamber 4, the pressure on the elastic diaphragm 61 is balanced or the pressure on one side of the detection air chamber 4 is slightly greater. In this case, the elastic diaphragm 61 remains relatively flat and is almost planar at the notch.

[0061] When the pressure in the reference gas cavity 65 is greater than the pressure in the detection gas cavity 4, the elastic diaphragm 61 is subjected to a pressure that causes it to bulge towards the detection gas cavity 4. In this case, the elastic diaphragm 61 is arranged in a semi-spherical shape at the gap, i.e. the central part of the diaphragm is bent towards the detection gas cavity 4, while the edge part remains connected to the edge of the gap of the housing. This semi-spherical deformation significantly changes the relative position between the conductive member 62 and the contact switch 64.

[0062] To ensure that the pressure in the detection gas cavity 4 remains at a standard atmospheric pressure, the pressure in the reference gas cavity 65 is at a standard atmospheric pressure when the self-regulating mechanism 6 switches to the on state. Thus, if for some reason (such as a drop in pressure in the detection gas cavity 4), the regulating module can control the adjustment to restore balance.

[0063] Specifically, when the pressure in the reference gas cavity 65 is less than or equal to a standard atmospheric pressure, the self-regulating mechanism 6 switches to the on state. At this time, the gas collection mechanism is in communication with the gas exhaust mechanism through the self-regulating mechanism 6, allowing gas to be smoothly exhausted. When the pressure in the reference gas cavity 65 is greater than a standard atmospheric pressure, the self-regulating mechanism 6 switches to the off state, cutting off the connection between the gas collection mechanism and the gas exhaust mechanism. At this time, the introduction of the gas to be detected continues, which can increase the pressure in the detection gas cavity 4, avoiding the situation that the pressure in the detection gas cavity 4 is too low, affecting the detection result.

[0064] In some embodiments, as shown in FIG. 1, the gas inlet mechanism includes a regulating valve 2 and a flow meter 3. The gas source is connected to the gas inlet end of the detection gas cavity 4 through the regulating valve 2 and the flow meter 3. Figure 1

[0065] The regulating valve 2 is responsible for controlling the flow of gas into the detection gas cavity 4. By adjusting the opening of the regulating valve 2, precise regulation of the gas flow can be achieved. This helps to maintain the stability of the pressure in the detection gas cavity 4 under different working conditions and meets the specific experimental or process requirements.

[0066] The flow meter 3 is used to measure the flow of gas entering the detection gas cavity 4 through the gas inlet mechanism. It can convert the flow of gas into a measurable signal (such as an electrical signal) and display and record it in real time through a display instrument or control system. The presence of the flow meter 3 allows the operator to intuitively understand the flow of gas and adjust the regulating valve 2 accordingly to ensure the accuracy and stability of the gas flow.

[0067] When it is necessary to introduce gas into the detection gas cavity 4, first open the inlet valve of the regulating valve 2 to allow gas to enter the regulating valve 2. Then, adjust the opening of the regulating valve 2 to change the flow of gas. During the adjustment process, the readings on the flow meter 3 can be observed to determine whether the actual flow has reached the preset value. If further adjustment of the flow is required, the above steps can be repeated until the requirements are met. ​

[0068] The gas adjusted by the regulating valve 2 enters the intake end of the detection chamber 4 through the flow meter 3. In this process, the flow meter 3 continuously monitors and records the flow data of the gas. If the pressure in the detection chamber 4 needs to be kept stable, the opening of the regulating valve 2 can be automatically adjusted by the feedback control system.

[0069] In addition, the intake mechanism also includes an intake pipeline 1 connected between the gas source and the intake end of the detection chamber 4, and the regulating valve 2 and the flow meter 3 are arranged on the intake pipeline 1. The intake pipeline 1 delivers the gas in the gas source to the detection chamber 4.

[0070] When the system starts to work, the gas in the gas source first enters the regulating valve 2 through the intake pipeline 1. Under the control of the regulating valve 2, the gas enters the flow meter 3 according to the preset flow rate. The flow meter 3 converts the measured gas flow into an identifiable signal (such as an electrical signal) and displays and records it in real time through a display instrument or a control system. The gas measured by the flow meter 3 continues to flow along the intake pipeline 1 and finally enters the intake end of the detection chamber 4. In the detection chamber 4, the gas will be detected.

[0071] As shown in Figure 1 The exhaust mechanism includes an exhaust pipeline 5 connected between the exhaust end of the detection chamber 4 and the gas collection mechanism. The main function of the exhaust pipeline 5 is to exhaust the gas in the detection chamber 4 to make room for new gas samples or experimental conditions. By connecting the gas collection mechanism, the exhaust pipeline 5 can also collect the exhausted gas. The gas collection mechanism can be a gas storage tank, a gas treatment device or other equipment that can safely contain and process gas.

[0072] In this embodiment, the exhaust pipeline 5 also plays a role in balancing the pressure inside and outside the detection chamber 4. By adjusting the exhaust gas of the exhaust pipeline 5, the pressure in the detection chamber 4 can be ensured, avoiding the influence of the experimental or detection effect due to the excessively high or low pressure.

[0073] It should be noted that the self-adjusting mixing ratio detector also includes a detection module. The detection module is arranged in the detection chamber 4 and is used to detect the gas in the detection chamber 4. The detection module can analyze the gas composition in the detection chamber 4, including but not limited to the concentration, proportion and possible impurities or pollutants of various gases. In some advanced self-adjusting mixing ratio detectors, the detection module can also be linked with the self-adjusting mechanism 6 (including the intake mechanism and the exhaust mechanism). When the gas composition, pressure or temperature deviates from the preset range, the detection module will trigger the corresponding adjustment mechanism to automatically adjust the intake amount, exhaust amount or gas mixing ratio to restore the preset conditions.

[0074] In a specific embodiment, as shown in Figure 1 and Figure 2The gas collecting mechanism is connected with the exhaust pipeline 5, the air inlet pipeline 1 is connected with the air source, the self-adjusting mixed ratio detector is started, the SF6 / CF4 mixed gas to be detected flows along the air inlet pipeline 1, passes through the adjusting valve 2 and the flowmeter 3, and then sequentially flows through the detection gas cavity 4 and the exhaust pipeline 5, and the rotating adjusting valve 2 is used to make the flowmeter 3 display a flow of 300 mL / min.

[0075] The reference gas cavity 65 in the self-adjusting mechanism 6 is a sealed structure, a certain amount of air is pre-filled in the reference gas cavity 65, when the conductive part 62 at the center position of the elastic diaphragm 61 is attached to the contact switch 64 fixed at the axial position of the reference gas cavity 65 through the support rod 63, the air pressure in the reference gas cavity 65 is the standard atmospheric pressure. The electromagnetic valve 7 is a normally closed electromagnetic valve 7, under the non-working condition, the front and rear ends of the detector are in a sealed state, the internal pressure of the detector is the last working pressure, close to the standard atmospheric pressure, at this time, the elastic diaphragm 61 is compressed in the direction of reducing the volume of the reference gas cavity 65 under the action of pressure, when the pressures on both sides of the elastic diaphragm 61 are balanced, they are both the standard atmospheric pressure (the volume outside the reference gas cavity 65 is much larger than the volume of the reference gas cavity 65), at this time, the conductive part 62 is tightly attached to the contact switch 64, and the electrical contacts on both sides of the contact switch 64 are electrically connected.

[0076] When the detector is started, the contact switch 64 is turned on, the electromagnetic valve 7 is controlled to be opened, the internal pressure of the gas collecting mechanism is the atmospheric environmental pressure, the electromagnetic valve 7 is always in an opened state, and the detection tail gas enters the gas collecting bag 8. When the detector is started, the contact switch 64 is turned on, the electromagnetic valve 7 is controlled to be opened, the internal pressure of the gas collecting mechanism is the atmospheric environmental pressure, the gas in the detector enters the gas collecting mechanism under the action of the pressure difference, the pressure out of the exhaust pipeline 5 decreases and is lower than the standard atmospheric pressure, at this time, the elastic diaphragm 61 expands in the direction of increasing the volume of the reference gas cavity 65, the conductive part 62 is separated from the contact switch 64, at this time, the contact switch 64 is closed, and the electromagnetic valve 7 is closed.

[0077] In order to form a detection gas flow, the air inlet pressure of the front end (air inlet mechanism) of the detector is higher than the standard atmospheric pressure (generally set to 0.2 MPa), when the SF6 / CF4 mixed gas to be detected flows to the self-adjusting mechanism 6, the elastic diaphragm 61 is separated from the contact switch 64 due to the closed electromagnetic valve 7, the pressure outside the elastic diaphragm 61 continuously rises, when the pressure rises to the standard atmospheric pressure, the conductive part 62 is attached to the contact switch 64 again, the electromagnetic valve 7 is opened, and the detection tail gas flows into the gas collecting mechanism. Since the diameter of the exhaust pipeline is designed to be large, the detection tail gas quickly flows out, the pressure outside the elastic diaphragm 61 is not obvious, the elastic diaphragm 61 is always near the position of the contact switch 64 in the detection process and will not be excessively compressed in the direction of reducing the volume of the reference gas cavity 65, and the internal and external pressures are maintained near the standard atmospheric pressure. Through the method, it is ensured that the pressure of the detection exhaust mechanism is the standard atmospheric pressure under the condition that the atmospheric environmental pressure is lower than the standard atmospheric pressure, and the error caused by the atmospheric pressure in the detection process is reduced.

[0078] Finally, it should be noted that the above examples are intended to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A self-adjusting mixed ratio detector, characterized by, The utility model relates to a kind of self-regulating gas detection instrument, including: Instrument body is formed with detection gas cavity; Air inlet mechanism, one end is communicated with gas source, the other end is connected with the air inlet end of the detection gas cavity; Exhaust mechanism, one end is connected with the exhaust end of the detection gas cavity; Gas collection mechanism and self-regulating mechanism, the other end of the exhaust mechanism is connected with the gas collection mechanism through the self-regulating mechanism; A part of the self-regulating mechanism is arranged in the exhaust mechanism, and reference gas cavity is formed, and the self-regulating mechanism can be switched between on state and off state; When the air pressure in the reference gas cavity is less than or equal to the air pressure in the detection gas cavity, the self-regulating mechanism switches to the on state, and the gas collection mechanism is communicated with the exhaust mechanism through the self-regulating mechanism;When the air pressure in the reference gas cavity is greater than the air pressure in the detection gas cavity, the self-regulating mechanism switches to the off state, and the self-regulating mechanism cuts off the gas collection mechanism and the exhaust mechanism.

2. The self-tuning mixed ratio detector according to claim 1, characterized by, The self-regulating mechanism includes: Adjusting module, arranged in the exhaust mechanism, and forming the reference gas cavity; Solenoid valve, connected between the gas collection mechanism and the exhaust mechanism; When the air pressure in the reference gas cavity is less than or equal to the air pressure in the detection gas cavity, the adjusting module controls the solenoid valve to communicate the gas collection mechanism and the exhaust mechanism; When the air pressure in the reference gas cavity is greater than the air pressure in the detection gas cavity, the adjusting module controls the solenoid valve to cut off the gas collection mechanism and the exhaust mechanism.

3. The self-tuning mixed ratio detector according to claim 2, wherein The adjusting module includes: Housing, one side of the housing is provided with a notch, and an elastic film is arranged at the notch, and the elastic film cooperates with the housing to form the reference gas cavity; Conductive part, arranged on the elastic film; Contact switch, arranged in the reference gas cavity; When the air pressure in the reference gas cavity is less than or equal to the air pressure in the detection gas cavity, the elastic film shrinks to drive the conductive part to contact the contact switch, so that the solenoid valve communicates the gas collection mechanism and the exhaust mechanism; When the air pressure in the reference gas cavity is greater than the air pressure in the detection gas cavity, the elastic film is driven to separate the conductive part from the contact switch, so that the solenoid valve cuts off the gas collection mechanism and the exhaust mechanism.

4. The self-tuning mixed ratio detector according to claim 3, wherein The adjusting module further includes: Supporting rod, connected with the housing, arranged in the reference gas cavity, and the contact switch is arranged on the supporting rod.

5. The self-tuning mixed ratio detector according to claim 3, wherein When the air pressure in the reference gas cavity is less than or equal to the air pressure in the detection gas cavity, the elastic film is arranged in the notch in a plane;When the air pressure in the reference gas cavity is greater than the air pressure in the detection gas cavity, the elastic film is arranged in the notch in a hemispherical shape.

6. The self-tuning mixed ratio detector according to claim 1, wherein When the self-regulating mechanism switches to the on state, the pressure in the reference gas cavity is one standard atmospheric pressure.

7. The self-tuning mixed ratio detector according to claim 1, wherein The air inlet mechanism includes: adjusting valve and flowmeter;The gas source is communicated with the air inlet end of the detection gas cavity through the adjusting valve and the flowmeter.

8. The self-tuning mixed ratio detector according to claim 7, wherein The air inlet mechanism further includes: Air inlet pipeline, connected between the gas source and the air inlet end of the detection gas cavity, and the adjusting valve and the flowmeter are arranged on the air inlet pipeline.

9. A self-tuning mixed ratio detector according to any one of claims 1 to 8, characterized in that, The exhaust mechanism includes: An exhaust pipe is connected between the exhaust end of the detection gas cavity and the gas collecting mechanism.

10. A self-tuning mixed ratio detector according to any one of claims 1 to 8, characterized in that, The self-adjusting mixed ratio detector further comprises: A detection module is arranged in the detection gas cavity and used for detecting the gas in the detection gas cavity.

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