Self-rescuer inspection tester

Abstract

The utility model belongs to the technical field of coal mine underground self-rescue, and aims to solve the problems of low efficiency and complex operation of a traditional self-rescuer check meter. A port A and a port B of an air source positive and negative pressure switching valve are connected with a direct-current air pump, a port A of a flow switching valve is connected with a port P of the air source positive and negative pressure switching valve, and a port B of the flow switching valve is connected with an air outlet end of a glass rotameter. The air inlet end of the glass rotameter is respectively connected with a port R of the flow switching valve and the quantitative oxygen supply measuring hole through a tee joint, a port P of the flow switching valve is connected with the first end of the throttling valve, and the second end of the throttling valve is respectively connected with the micro pressure difference transmitter and the inspection hole through a tee joint; according to the device, the micro pressure difference transmitter is used for detecting the pressure, and the pressure value is displayed in real time; according to the device, through the two switching valves, operation steps can be greatly simplified, and switching of different functions in common inspection items is achieved; according to the device, the access of the flow meter is added in the inspection stable gas source.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground self-rescue in coal mines, and in particular relates to a self-rescuer inspection instrument. Background Art

[0002] When a fire occurs in a coal mine, toxic and harmful gases exceed the standard, or a mine accident occurs, the air in the underground environment cannot provide enough oxygen, or there are toxic and harmful gases, which makes it difficult for miners to breathe normally. The self-rescuer can provide oxygen to the miners in an emergency. Therefore, regular inspection of the self-rescuer is very important.

[0003] There are few instruments and equipment on the market for testing the performance of self-rescuers, and the main disadvantages are as follows:

[0004] 1. The self-rescuer is relatively large, approximately 300mm×470mm×200mm, and is inconvenient to carry for on-site inspection.

[0005] 2. The pressure value is tested with a water column pressure gauge. When using it, you need to fill it with the right amount of water, and the water level must be exactly at zero. In actual use, you need to pay special attention. When the pressure exceeds the range, the water will be blown out of the water column pressure gauge, and you need to refill it with water. In addition, the minimum scale of the water column pressure gauge is 10Pa. Due to the influence of tension, the water column liquid surface is not a plane, but a curved surface, which is difficult to read, and the reading is prone to large human errors.

[0006] 3. The air flow rate of the air pump is small. It takes more than 1 minute to blow up a 5L air bag. When doing a negative pressure test, the air pump cannot provide enough negative pressure, resulting in the automatic supply valve not being able to open, and the opening pressure of the automatic supply valve cannot be measured.

[0007] 4. When conducting a respiratory system air tightness test or measuring pressure and controlling a certain flow rate of air flow output during the test, an external person needs to use a rubber hose to manually transfer the gas line through a tee, which is time-consuming. The correctness of the external pipe is related to the level of the tester, which increases the risk of human error. The connection of the external gas line cannot guarantee air tightness, affecting the test pressure results.

[0008] 5. When dealing with large quantities of self-rescuer inspections, the efficiency is low, and the risk of inaccurate measurement results caused by manual readings will increase. The efficiency and accuracy of the test results cannot be guaranteed, and the repeatability is poor. Utility Model Content

[0009] In order to solve at least one of the above technical problems existing in the prior art, the utility model provides a self-rescuer inspection instrument.

[0010] The utility model adopts the following technical solutions: a self-rescuer inspection instrument, including a DC air pump, an air source positive and negative pressure switching valve, a flow switching valve, a glass rotor flowmeter, a micro-pressure differential transmitter, a quantitative oxygen supply measuring hole, a throttle valve, a test hole and a control module;

[0011] Port A and port B of the air source positive and negative pressure switching valve are connected to the DC air pump, port A of the flow switching valve is connected to port P of the air source positive and negative pressure switching valve, port B of the flow switching valve is connected to the air outlet of the glass rotor flowmeter, the air inlet of the glass rotor flowmeter is respectively connected to port R of the flow switching valve and the quantitative oxygen supply measuring hole, port P of the flow switching valve is connected to the first end of the throttle valve, and the second end of the throttle valve is respectively connected to the micro-pressure differential transmitter and the inspection hole;

[0012] The DC air pump is used to provide the positive and negative pressure air source required for the air tightness detection of the self-rescuer, and to provide the quantitative and stable air source required for the reverse leakage detection of the breathing valve piece of the self-rescuer; the air source positive and negative pressure switching valve is used to switch the positive pressure detection air circuit and the negative pressure detection air circuit; the flow switching valve is used to realize the connection and separation of the glass rotor flowmeter and the entire air circuit; the glass rotor flowmeter is used to detect the gas flow; the micro-pressure differential transmitter is used to detect the air pressure and transmit the detected signal to the control module; the throttle valve is used to control the size of the gas flow.

[0013] Preferably, a buffer gas box is provided between the DC air pump and the air source positive and negative pressure switching valve, and the quantitative oxygen supply measuring hole and the inspection hole are provided on the shell of the self-rescuer inspection instrument and are both used to connect with the self-rescuer being inspected.

[0014] Preferably, the control module includes a control panel, a voltage-stabilized power supply, a power button, a battery pack and a touch serial port display screen; wherein the voltage-stabilized power supply, the battery pack and the touch serial port display screen are all connected to the control panel, and the power button is connected between the voltage-stabilized power supply and the 220V AC power; the DC air pump and the micro-pressure differential transmitter are both connected to the control panel.

[0015] Preferably, the gas source positive and negative pressure switching valve and the flow switching valve are both two-position five-way valves.

[0016] Preferably, the air source positive and negative pressure switching valve and the flow switching valve are both electric valves, which include an upper base and a lower base that are interlocked, as well as a valve body, a cam, a sliding mechanism and a motor compartment; the motor compartment with a built-in motor and a reducer is snapped on the upper end of the upper base, and the upper base and the lower base are snapped on the valve body. The cam drives the sliding mechanism to move relative to the valve body under the action of the motor and the reducer, and the sliding mechanism pushes and pulls the valve stem of the valve body to retract and control the change of the gas path in the valve body.

[0017] Preferably, the model of the glass rotor flowmeter is LZB-4 glass rotor flowmeter, and the model of the micro differential pressure transmitter is HCCY100 micro differential pressure transmitter.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] This device uses a DC voltage-stabilizing pump body, which can provide a stable airflow of 20L / min. For the inspection of thousands of self-rescuers in the mine, it will greatly shorten the inspection time. Compared with the traditional inspection instruments that use water column pressure gauges and need to read the scale manually, this device uses a pressure sensor to detect the pressure and displays the pressure value on the screen in real time for the user to view. The stable inspection air source provided by this device adds the access of a flow meter, so that a stable air source with a known flow rate can be provided to perform pressure detection on the inspected equipment; it can measure the reverse leakage of the respirator valve of the self-rescuer and other inspection items, which adds inspection functions compared to traditional inspection equipment. This device adopts an integrated air circuit design and provides two switching valves. The positive and negative pressure of the air source output can be switched by turning one of the valves, and the output stable airflow flow detection can be achieved by turning the other valve. It can greatly simplify the operating steps and realize the switching of different functions in common inspection items. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is the gas circuit schematic diagram of the device;

[0022] Figure 2 is the circuit diagram of the device;

[0023] Figure 3 This is the internal gas circuit diagram of the two-position five-way valve of this device;

[0024] Figure 4 This is the air path flow diagram for negative pressure air tightness detection of the self-rescuer breathing system;

[0025] Figure 5 This is the air path flow diagram for positive pressure air tightness detection of the breathing system of this self-rescuer;

[0026] Figure 6 This is the gas flow diagram for detecting the reverse leakage of the breathing valve of the self-rescuer;

[0027] Figure 7 This is the gas flow diagram for quantitative oxygen supply detection of this self-rescuer;

[0028] Figure 8 It is the structural diagram of the two-position five-way electric valve of this device.

[0029] In the figure: 1-DC air pump; 2-air source positive and negative pressure switching valve; 3-flow switching valve; 4-glass rotor flowmeter; 5-micro differential pressure transmitter; 6-quantitative oxygen supply measurement hole; 7-throttle valve; 8-inspection hole; 9-control board; 10-voltage-stabilized power supply; 11-power button; 12-battery pack; 13-touch serial port display screen; 14-upper base; 15-lower base; 16-valve body; 17-cam; 18-sliding mechanism; 19-motor compartment; 20-buffer gas box. DETAILED DESCRIPTION

[0030] Combined with the drawings in the embodiments of the utility model, the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, so they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0032] The utility model provides an embodiment:

[0033] like Figures 1 to 8 As shown, a self-rescuer inspection instrument comprises a DC air pump 1, an air source positive and negative pressure switching valve 2, a flow switching valve 3, a glass rotor flowmeter 4, a micro-pressure differential transmitter 5, a quantitative oxygen supply measuring hole 6, a throttle valve 7, an inspection hole 8 and a control module; port A and port B of the air source positive and negative pressure switching valve 2 are connected to the DC air pump 1, port A of the flow switching valve 3 is connected to port P of the air source positive and negative pressure switching valve 2, port B of the flow switching valve 3 is connected to the air outlet end of the glass rotor flowmeter 4, and the air inlet end of the glass rotor flowmeter 4 is respectively connected to port R of the flow switching valve 3 and the quantitative oxygen supply measuring hole 6, port P of the flow switching valve 3 is connected to the first end of the throttle valve 7, and the second end of the throttle valve 7 is respectively connected to the micro-pressure differential transmitter 5 and the inspection hole 8; a buffer gas box 20 is arranged between the DC air pump 1 and the air source positive and negative pressure switching valve 2, and the quantitative oxygen supply measuring hole 6 and the inspection hole 8 are arranged on the shell of the self-rescuer inspection instrument and are both used to connect with the self-rescuer to be inspected.

[0034] The DC air pump 1 is used to provide the positive and negative pressure air sources required for the air tightness detection of the self-rescuer, and to provide the quantitative and stable air source required for the reverse leakage detection of the breathing valve piece of the self-rescuer; the air source positive and negative pressure switching valve 2 is used to switch the positive pressure detection air circuit and the negative pressure detection air circuit; the flow switching valve 3 is used to realize the connection and separation of the glass rotor flowmeter 4 and the entire air circuit; the glass rotor flowmeter 4 is used to detect the gas flow; the micro-pressure differential transmitter 5 is used to detect the air pressure and transmit the detected signal to the control module; the throttle valve 7 is used to control the size of the gas flow.

[0035] In this embodiment, the volume of the self-rescuer is 300mm×300mm×200mm, which is easy to carry and occupies little space; the model of the micro-differential pressure transmitter 5 is HCCY100 micro-differential pressure transmitter, and the measuring range is (-1000~2000)Pa; the accuracy is 0.5%FS; the model of the glass rotor flowmeter 4 is LZB-4 glass rotor flowmeter, and the measuring range is: (0.016—0.16)m 3 / h; Grade: 2.5; This device uses a DC voltage-stabilizing pump body, which can provide a stable airflow of 20L / min. It only takes 15s to blow up a 5L airbag. The positive pressure output can reach 350KPa, and the negative pressure input can reach -90KPa. The negative pressure can suck the airbag to the air supply pressure plate to open the automatic supply valve to meet the test requirements. By rotating the knobs of the two two-position five-way valve reversing valves, the positive and negative pressures of the gas source output can be directly switched inside the instrument, and the glass rotor flowmeter can be selected and incorporated into the output gas path to measure the instantaneous flow of the output gas flow. The gas path can also be cut out separately to measure the quantitative oxygen supply value of the self-rescuer separately. The airflow output hole is retained on the outside of the instrument. During the test, you only need to connect the self-rescuer to the output hole with a rubber hose. There is no need to configure external pipelines. Different inspection functions can be achieved through the function selection knob, which can improve efficiency and reduce human connection errors.

[0036] The control module of the device includes a control panel 9, a voltage-stabilized power supply 10, a power button 11, a battery pack 12 and a touch serial port display screen 13; wherein the voltage-stabilized power supply 10, the battery pack 12 and the touch serial port display screen 13 are all connected to the control panel 9, and the power button 11 is connected between the voltage-stabilized power supply 10 and the 220V AC power supply; the DC air pump 1 and the micro differential pressure transmitter 5 are all connected to the control panel 9. The inspection instrument has a built-in 12V battery pack and can be used in an environment without a 220V AC power supply, thereby improving the adaptability of the inspection environment.

[0037] The air source positive and negative pressure switching valve 2 and the flow switching valve 3 are both two-position five-way electric valves; the electric valve includes an upper base 14 and a lower base 15 that are interlocked, as well as a valve body 16, a cam 17, a sliding mechanism 18 and a motor compartment 19; the motor compartment 19 with a built-in motor and reducer is snapped on the upper end of the upper base 14, and the upper base 14 and the lower base 15 are snapped on the valve body 16. The cam 17 drives the sliding mechanism 18 to move relative to the valve body 16 under the action of the motor and the reducer, and the sliding mechanism 18 pushes and pulls the valve stem of the valve body 16 to retract and control the change of the air path in the valve body 16.

[0038] The core of this device is to design a set of air circuits to perform functions such as the air tightness of the breathing system of the self-rescuer and the reverse leakage of the breathing valve. Two two-position five-way valves are used to realize the functional switching of pressure and flow detection. In conjunction with the flow control valve, the size of the airflow can be accurately controlled to achieve the given set pressure value, and the self-rescuer under test can be inspected according to the standard.

[0039] After the equipment is powered on, when testing the air tightness of the self-rescuer breathing system, the mouthpiece of the self-rescuer to be tested is connected to the inspection hole 8 of the equipment through a special tooling; when testing the positive pressure air tightness, the air source positive and negative pressure switching valve 2 is turned to one side to connect the positive pressure air path; when testing the negative pressure air tightness, it is turned to the other side to connect the negative pressure air path; press the DC air pump start / stop button to start the DC air pump and pressurize the airbag; control the strength of the DC air pump output airflow by controlling the speed of the DC air pump, and control the size of the airflow by turning the throttle valve; when the pressure reaches the test pressure, close the throttle valve to maintain the pressure, start timing, observe the drop in the pressure indicator on the screen, and complete the breathing system air tightness test.

[0040] When measuring the quantitative oxygen supply, the device to be tested is connected to the quantitative oxygen supply measurement hole 6, and the flow switching valve is turned to one side. At this time, the flow meter can be separated from the entire gas path, so that the quantitative oxygen supply flow rate can be measured separately. When the flow switching valve is turned to the other side, the flow meter is connected to the entire gas path. By controlling the opening and closing degree of the throttle valve, the output of a constant flow of air can be controlled as a test gas source, and by connecting to the test hole 8, the test of related tests can be realized.

[0041] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A self-rescuer inspection instrument, characterized in that: It comprises a direct current air pump (1), an air source positive and negative pressure switching valve (2), a flow switching valve (3), a glass rotor flowmeter (4), a micro-pressure differential transmitter (5), a quantitative oxygen supply measuring hole (6), a throttle valve (7), a test hole (8) and a control module; Port A and port B of the air source positive and negative pressure switching valve (2) are connected to the DC air pump (1), port A of the flow switching valve (3) is connected to port P of the air source positive and negative pressure switching valve (2), port B of the flow switching valve (3) is connected to the air outlet end of the glass rotor flowmeter (4), the air inlet end of the glass rotor flowmeter (4) is respectively connected to port R of the flow switching valve (3) and the quantitative oxygen supply measuring hole (6), port P of the flow switching valve (3) is connected to the first end of the throttle valve (7), and the second end of the throttle valve (7) is respectively connected to the micro-pressure differential transmitter (5) and the inspection hole (8); The DC air pump (1) is used to provide positive and negative pressure air sources required for air tightness detection of the self-rescuer, and to provide a quantitative and stable air source required for reverse leakage detection of the breathing valve of the self-rescuer; the air source positive and negative pressure switching valve (2) is used to switch the positive pressure detection air path and the negative pressure detection air path; the flow switching valve (3) is used to connect and disconnect the glass rotor flowmeter (4) from the entire air path; the glass rotor flowmeter (4) is used to detect gas flow; the micro-pressure differential transmitter (5) is used to detect air pressure and transmit the detected signal to the control module; the throttle valve (7) is used to control the size of the gas flow.

2. A self-rescuer inspection instrument according to claim 1, characterized in that: A buffer gas box (20) is arranged between the DC air pump (1) and the air source positive and negative pressure switching valve (2); a quantitative oxygen supply measuring hole (6) and a test hole (8) are arranged on the housing of the self-rescuer inspection instrument and are used to connect to the self-rescuer to be inspected.

3. A self-rescuer inspection instrument according to claim 1, characterized in that: The control module comprises a control panel (9), a voltage-stabilized power supply (10), a power button (11), a battery pack (12) and a touch serial port display screen (13); wherein the voltage-stabilized power supply (10), the battery pack (12) and the touch serial port display screen (13) are all connected to the control panel (9), and the power button (11) is connected between the voltage-stabilized power supply (10) and a 220V alternating current; and the DC air pump (1) and the micro-differential pressure transmitter (5) are all connected to the control panel (9).

4. A self-rescuer inspection instrument according to claim 1, characterized in that: The gas source positive and negative pressure switching valve (2) and the flow switching valve (3) are both two-position five-way valves.

5. A self-rescuer inspection instrument according to claim 1, characterized in that: The gas source positive and negative pressure switching valve (2) and the flow switching valve (3) are both electric valves, which include an upper base (14) and a lower base (15) that are interlocked, as well as a valve body (16), a cam (17), a sliding mechanism (18) and a motor compartment (19); the motor compartment (19) with a built-in motor and a reducer is interlocked with the upper end of the upper base (14), and the upper base (14) and the lower base (15) are interlocked with the valve body (16); the cam (17) drives the sliding mechanism (18) to move relative to the valve body (16) under the action of the motor and the reducer, and the sliding mechanism (18) pushes and pulls the valve stem of the valve body (16) to extend and retract to control the change of the gas path in the valve body (16).

6. A self-rescuer inspection instrument according to claim 1, characterized in that: The model of the glass rotor flowmeter (4) is LZB-4 glass rotor flowmeter, and the model of the micro differential pressure transmitter (5) is HCCY100 micro differential pressure transmitter.

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