Trace oxygen measuring equipment

Abstract

The utility model discloses trace oxygen measuring equipment and relates to the field of gas detection equipment. The trace oxygen measuring equipment comprises a measuring table, and further comprises a plurality of sample pipelines which are arranged on the measuring table at equal intervals, and each sample pipeline is used for conveying different sample gases to be measured; the control valve is arranged at the gas outlet end of the sample pipeline; the analyzer is connected to the measuring table, and a second external thread connector is fixedly connected to the analyzer; the air outlet end of the three-way valve is detachably connected to the second external thread connector, and the air outlet end of the other end of the three-way valve is fixedly communicated with a connecting pipe; according to the utility model, air replacement is carried out for 30 seconds through the three-way valve, air in the hose is extruded out by using sample gas, constant oxygen in the air is prevented from entering the analyzer, the measured oxygen content is ensured to be the real content of a sample, the high measured value caused by oxygen interference is avoided, and the measurement accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gas detection equipment technical field, concretely relates to a trace oxygen determination equipment. BACKGROUND

[0002] At present, when the portable trace oxygen analyzer measures the sample of trace oxygen content in gas ≤500ppm, directly adopt the hose of 3mm diameter, adopt the internal thread joint of 6mm diameter on both ends of the hose, one end is butt joint with the sample pipeline of the sample to be measured (the external thread joint of 6mm diameter), the other end is directly connected with the instrument (the instrument is equipped with the external thread joint of 6mm), however, the air (oxygen content is about 20.9%) in the hose between the instrument and the pipeline is entered into the instrument after the instrument is opened, the oxygen in the air is entered into the instrument after the measurement state, the oxygen content of the instrument is higher than the actual sample, the instrument contacts the oxygen of the measurement range in the measurement process, thereby the detector of the instrument is damaged, the service life of the instrument and the measurement accuracy are reduced, in view of this, the utility model is provided. CONTENT OF THE UTILITY MODEL

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, and provide a trace oxygen determination equipment that can overcome the above problems or at least partially solve the above problems.

[0004] To solve the above technical problems, the basic idea of the technical scheme of the utility model is:

[0005] A trace oxygen determination equipment, comprising a determination table, further comprising: a plurality of sample pipelines, equidistantly arranged on the determination table, and each sample pipeline being used for conveying different sample gas to be measured; a control valve arranged on the gas outlet end of the sample pipeline; an analyzer connected to the determination table, wherein the analyzer is fixedly connected with an external thread joint two; the gas outlet end of a three-way valve is detachably connected to the external thread joint two, wherein the other end of the three-way valve is fixedly communicated with a connecting pipe; a hose is detachably connected with the control valve at one end and connected with the gas inlet end of the three-way valve at the other end.

[0006] Preferably, the control valve is fixedly connected with an external thread joint one, the hose is fixedly connected with an internal thread joint two, and the external thread joint one is threadedly connected with the internal thread joint two.

[0007] Preferably, the gas outlet end of the three-way valve is fixedly connected with a gas conveying pipe, the gas conveying pipe is fixedly connected with an internal thread joint one, and the internal thread joint one is threadedly connected with the external thread joint two.

[0008] In order to increase the sealing between the outer threaded joint two and the inner threaded joint one, further, the inner threaded joint one is provided with a tension ring, the tension ring is inserted into the outer threaded joint two, and a sealing gasket is arranged on the outer wall of the tension ring and is attached to the inner wall of the outer threaded joint two.

[0009] In order to further increase the sealing between the outer threaded joint two and the inner threaded joint one, still further, a gas bag is arranged around the outer wall of the tension ring, a sealing groove for cooperating with the gas bag is formed in the inner wall of the outer threaded joint two, and a gas outlet pipe for conveying gas into the gas bag is arranged on the inner threaded joint one, and an electromagnetic valve is arranged on the gas outlet pipe.

[0010] In order to automatically inflate the gas bag when the outer threaded joint two and the inner threaded joint one are connected, still further, a ring-shaped cavity is formed between the inner and outer walls of the inner threaded joint one, a piston disc in a ring shape is slidably connected in the ring-shaped cavity, a push rod is fixedly connected to the piston disc, one end of the push rod penetrates through the ring-shaped cavity and abuts against the outer wall of the outer threaded joint two, a spring is arranged in the ring-shaped cavity, one end of the spring is fixedly connected to the piston disc, and the other end is fixedly connected to the inner wall of the ring-shaped cavity, an air suction pipe is arranged on the inner threaded joint one and is in communication with the ring-shaped cavity, and one end of the gas outlet pipe away from the gas bag is in communication with the ring-shaped cavity.

[0011] In order to facilitate the discharge of the gas in the pressurized gas bag, still further, an exhaust pipe is arranged on the inner threaded joint one and is in communication with the gas bag, and a valve switch is arranged on the exhaust pipe.

[0012] After the above technical scheme is adopted, the utility model has the following beneficial effects compared with the prior art:

[0013] The utility model discloses a three-way valve is used for 30 seconds air replacement, and the sample gas is used for extruding the air in the hose, prevents the constant oxygen in the air from entering the analyzer, guarantees the oxygen content of measurement to be the real content of sample, avoids the measurement value to be high due to oxygen interference, and improves the accuracy of measurement.

[0014] The tension ring and the sealing gasket are arranged, so that the inner threaded joint one and the outer threaded joint two are tightly sealed when being connected, sample gas leakage is prevented, the amount of gas entering the analyzer is accurate, and the measurement accuracy is improved.

[0015] The gas bag is inflated and attached to the sealing groove, the sealing property is further enhanced, extremely small gas leakage is effectively prevented, and the measurement accuracy is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure diagram of the utility model Figure 1 ;

[0017] Figure 2 is a structural schematic of the utility model Figure 2 ;

[0018] Figure 3 is a partial structural schematic of the utility model Figure 1 ;

[0019] Figure 4 is a partial structural schematic of the utility model Figure 2 ;

[0020] Figure 5 is a utility model Figure 4 A part of the enlarged view.

[0021] In the figure: 1, determination platform; 101, sample pipeline; 102, control valve; 103, external thread joint one; 2, analyzer; 201, external thread joint two; 3, gas conveying pipe; 301, internal thread joint one; 302, three-way valve; 303, hose; 304, internal thread joint two; 305, connecting pipe; 4, tension ring; 401, gasket; 5, ring cavity; 501, piston disc; 502, push rod; 503, spring; 504, air suction pipe; 505, air outlet pipe; 506, air bag; 507, exhaust pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the embodiment will be clearly and completely described below in conjunction with the drawings in the utility model embodiment. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0023] Embodiment 1:

[0024] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , a trace oxygen determination device, comprising a determination platform 1, further comprising: a plurality of sample pipelines 101, equidistantly arranged on the determination platform 1, and each sample pipeline 101 is used for conveying different to-be-measured sample gas; a control valve 102 is arranged on the air outlet end of the sample pipeline 101; an analyzer 2 is connected to the determination platform 1, wherein the analyzer 2 is fixedly connected with an external thread joint two 201; the air outlet end of the three-way valve 302 is detachably connected to the external thread joint two 201, wherein the other end of the three-way valve 302 is fixedly communicated with a connecting pipe 305; one end of the hose 303 is detachably connected with the control valve 102, and the other end is communicated with the air inlet end of the three-way valve 302.

[0025] The control valve 102 is fixedly connected with an external thread joint one 103, the hose 303 is fixedly connected with an internal thread joint two 304, and the external thread joint one 103 is threadedly connected with the internal thread joint two 304.

[0026] The three-way valve 302 is fixedly connected with a gas conveying pipe 3, the gas conveying pipe 3 is fixedly connected with an internal thread joint one 301, and the internal thread joint one 301 is threadedly connected with the external thread joint two 201.

[0027] In use, first, the measuring table 1 is placed in a stable and suitable working position to ensure its stability, then all the control valves 102 are closed, different sample gas to be measured is respectively connected to each sample pipeline 101, then one of the sample pipelines 101 is selected, the corresponding control valve 102 is slowly opened, the sample gas flows into the hose 303 and then into the three-way valve 302, at this time, the three-way valve 302 is in a state of being disconnected from the analyzer 2 and being communicated with the connecting pipe 305, so that the sample gas is discharged through the connecting pipe 305, and the process lasts for about 30 seconds. In this process, the air in the hose 303 is squeezed out by the flow of the sample gas. Since the sample gas continuously flows, the air in the hose 303 can be fully replaced, so as to avoid the constant oxygen in the air from entering the analyzer 2 in the subsequent detection process, reduce the damage risk of the detector of the analyzer 2, prolong the service life of the instrument, ensure the measurement accuracy, and ensure the measurement accuracy. After the air replacement is completed, the three-way valve 302 is operated to be communicated with the analyzer 2, at this time, the replaced sample gas enters the analyzer 2 through the gas conveying pipe 3, the analyzer 2 detects the trace oxygen content in the sample gas and records the detection result, and after the detection is completed, the control valve 102 corresponding to the current sample pipeline 101 is closed.

[0028] Embodiment 2:

[0029] Referring to Figure 5 A trace oxygen measuring device, which is basically the same as that in Embodiment 1, and further, the internal thread joint one 301 is provided with a tension ring 4, the tension ring 4 is inserted into the external thread joint two 201, and the outer wall of the tension ring 4 is provided with a sealing gasket 401, which is in close contact with the inner wall of the external thread joint two 201.

[0030] When the internal thread joint one 301 is connected with the external thread joint two 201, the tension ring 4 is inserted into the external thread joint two 201, and the sealing gasket 401 is in close contact with the inner wall of the external thread joint two 201 under the action of external force to form a sealing structure, which effectively prevents the sample gas from leaking through the gap between the internal thread joint one 301 and the external thread joint two 201, and ensures that all the gas enters the analyzer 2 for detection, thereby improving the measurement accuracy of the analyzer 2.

[0031] Embodiment 3:

[0032] Referring toFigure 3 、 Figure 4 、 Figure 5 A micro oxygen measuring device, substantially the same as example 1, further, a gas bag 506 is arranged around the outer wall of the tension ring 4, a sealing groove is arranged on the inner wall of the outer threaded connector 201 for cooperating with the gas bag 506, a gas outlet pipe 505 is arranged on the inner threaded connector 1 for connecting the gas source to the gas bag 506, and an electromagnetic valve is arranged on the gas outlet pipe 505.

[0033] A ring-shaped cavity 5 is arranged between the inner and outer walls of the inner threaded connector 1, a piston disc 501 in a ring shape is slidably connected in the ring-shaped cavity 5, a push rod 502 is fixedly connected to the piston disc 501, one end of the push rod 502 penetrates through the ring-shaped cavity 5 and abuts against the outer wall of the outer threaded connector 201, a spring 503 is arranged in the ring-shaped cavity 5, one end of the spring 503 is fixedly connected to the piston disc 501, and the other end is fixedly connected to the inner wall of the ring-shaped cavity 5, an air suction pipe 504 is arranged on the inner threaded connector 1 and communicates with the ring-shaped cavity 5, and one end of the gas outlet pipe 505 away from the gas bag 506 communicates with the ring-shaped cavity 5.

[0034] When the inner threaded connector 1 and the outer threaded connector 2 are threadedly connected, they gradually approach each other, in this process, the push rod 502 is pushed by the outer wall of the outer threaded connector 201, because the push rod 502 is fixedly connected to the piston disc 501, so the push rod 502 will drive the piston disc 501 to move in the ring-shaped cavity 5 and compress the spring 503, when the piston disc 501 moves to the side close to the air suction pipe 504, the space in the ring-shaped cavity 5 becomes smaller, according to the compressibility principle of gas, the gas is squeezed, causing the gas pressure in the ring-shaped cavity 5 to rise, then, when the inner threaded connector 1 and the outer threaded connector 2 are completely threadedly connected, the gas bag 506 corresponds to the sealing groove on the inner wall of the outer threaded connector 2, at this time, the electromagnetic valve on the gas outlet pipe 505 is opened, the high-pressure gas compressed in the ring-shaped cavity 5 can be filled into the gas bag 506 along the gas outlet pipe 505, so that the gas bag 506 expands and tightly fits the sealing groove, further increasing the sealing of the connection between the inner threaded connector 1 and the outer threaded connector 2, effectively preventing the sample gas from leaking, ensuring that all the gas enters the analyzer 2 for detection, and further improving the measurement accuracy of the analyzer 2;

[0035] Then, when the inner threaded connector 1 and the outer threaded connector 2 are disassembled, the compressed spring 503 generates a pushing force to push the piston disc 501 to slide in the ring-shaped cavity 5 away from the air suction pipe 504, so that the space in the ring-shaped cavity 5 increases and the pressure decreases, under the action of negative pressure, external gas is sucked into the ring-shaped cavity 5 through the air suction pipe 504.

[0036] It should be noted that a one-way valve is arranged on the air suction pipe 504 and the gas outlet pipe 505.

[0037] Embodiment 4:

[0038] Referring to Figure 3 , Figure 4 , Figure 5 A micro oxygen measuring device, substantially the same as Embodiment 1, further comprising an exhaust pipe 507 connected to the air bag 506 on the inner threaded joint 1 301, and a valve switch on the exhaust pipe 507.

[0039] When the device completes the detection task or needs to be disassembled for maintenance, the valve switch on the exhaust pipe 507 is opened, the gas in the air bag 506 is discharged, the air bag 506 is contracted, the extrusion on the sealing groove is released, the separation of the inner threaded joint 1 301 and the outer threaded joint 2 201 is facilitated, and the disassembly and maintenance of the device are facilitated.

[0040] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application.

Claims

1. A micro-oxygen measuring device comprising a measuring station (1), characterized in that, Also include: A plurality of sample pipes (101) are equidistantly arranged on the determination table (1), and each of the sample pipes (101) is used to transport different sample gas to be measured; Control valve (102) is arranged on the gas outlet end of the sample pipe (101); Analyzer (2) is connected to the determination table (1), Wherein, the outer thread joint two (201) is fixedly connected to the analyzer (2); The gas outlet end of the three-way valve (302) is detachably connected to the outer thread joint two (201), Wherein, the other end of the three-way valve (302) is fixedly connected with the connecting pipe (305); The hose (303) is detachably connected with the control valve (102), and the other end is connected with the gas inlet end of the three-way valve (302).

2. The apparatus of claim 1, wherein The outer thread joint one (103) is fixedly connected to the control valve (102), the inner thread joint two (304) is fixedly connected to the hose (303), and the outer thread joint one (103) is threadedly connected with the inner thread joint two (304).

3. The apparatus of claim 1, wherein the oxygen sensor is a paramagnetic oxygen sensor. The gas outlet end of the three-way valve (302) is fixedly connected with the gas conveying pipe (3), the inner thread joint one (301) is fixedly connected to the gas conveying pipe (3), and the inner thread joint one (301) is threadedly connected with the outer thread joint two (201).

4. The apparatus of claim 3, wherein the oxygen sensor is a paramagnetic oxygen sensor. The inner thread joint one (301) is provided with a tension ring (4), the tension ring (4) is inserted into the outer thread joint two (201), and the outer wall of the tension ring (4) is provided with a sealing gasket (401) which is matched with the inner wall of the outer thread joint two (201).

5. The apparatus of claim 4, wherein the oxygen sensor is a paramagnetic oxygen sensor. The outer wall of the tension ring (4) is provided with an air bag (506), the inner wall of the outer thread joint two (201) is provided with a sealing groove matched with the air bag (506), the inner thread joint one (301) is provided with a gas outlet pipe (505) for connecting the air source to the air bag (506), and the gas outlet pipe (505) is provided with a solenoid valve.

6. The apparatus of claim 5, wherein the oxygen sensor is a paramagnetic oxygen sensor. The inner and outer walls of the inner thread joint one (301) are provided with a ring type cavity (5), the piston disc (501) is slidably connected in the ring type cavity (5), the push rod (502) is fixedly connected to the piston disc (501), one end of the push rod (502) penetrates the ring type cavity (5) and abuts against the outer wall of the outer thread joint two (201), the spring (503) is arranged in the ring type cavity (5), one end of the spring (503) is fixedly connected with the piston disc (501), the other end is fixedly connected with the inner wall of the ring type cavity (5), the inner thread joint one (301) is provided with an air suction pipe (504) which is communicated with the ring type cavity (5), and one end of the gas outlet pipe (505) away from the air bag (506) is communicated with the ring type cavity (5).

7. The apparatus of claim 6 wherein, The inner thread joint one (301) is provided with an exhaust pipe (507) which is communicated with the air bag (506), and the exhaust pipe (507) is provided with a valve switch.

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