A hydrogen sensor testing device

Abstract

The present invention discloses a hydrogen sensor testing device, comprising a testing cylinder and a sensor body fixed in the testing cylinder, wherein a plurality of air inlet holes are provided on the lower side of the testing cylinder, a baffle plate is slidably installed in the testing cylinder, and a one-way opening component is provided on the baffle plate; when the baffle plate slides upward, the sensor body pushes the one-way opening component to move and detects the gas entering from the air inlet hole; the present invention provides a hydrogen sensor testing device, wherein when ambient gas is sucked from the air inlet hole, the baffle plate blocks the hydrogen sensor and ambient gas in the testing cylinder, thereby preventing the high-speed flowing gas from impacting the hydrogen sensor; when the baffle plate rises to a certain height, the fixed hydrogen sensor pushes the one-way opening component to make the hydrogen sensor contact with the stable ambient gas, thereby detecting the ambient gas, and avoiding poisoning of the hydrogen sensor.

Description

Technical Field

[0001] The invention relates to hydrogen detection technology, and in particular to a hydrogen sensor testing device. Background Art

[0002] A hydrogen sensor is an instrument that mainly detects hydrogen concentration. It is widely used in industrial production, chemical testing, and gas detection. In addition to detecting hydrogen concentration, the detection parameters of a hydrogen sensor may also be physical quantities such as hydrogen pressure and flow. Hydrogen sensors can be divided into many types according to their working principles and structures, mainly including current type, voltage type, resistance type, and optical type.

[0003] For example, the patent with the authorization announcement number CN216285122U and the authorization announcement date April 12, 2022, is named a hydrogen sensor detection device, specifically a hydrogen sensor detection device, which includes a test cabin body, a test cabin cover and a cover driving mechanism, the cover driving mechanism is connected to the power unit, and the cover driving mechanism is connected to the test cabin cover. Under the drive of the power unit, the cover driving mechanism controls the test cabin cover to separate or close from the test cabin body; at least one sensor interface is provided in the test cabin body, and the sensor interface matches the hydrogen sensor; the hydrogen sensor detection device of this patent is closer to the actual use of the sensor and the data is more reliable.

[0004] Another example is a patent with authorization announcement number CN218727057U and authorization announcement date March 24, 2023, entitled "A hydrogen sensor testing device", which includes a test box, wherein an interference component is provided inside the test box and is used to test the anti-interference ability of the hydrogen sensor, a hydrogen production component, wherein the hydrogen production component is installed inside the test box and is used to produce hydrogen, wherein a water tank and an electrode of the hydrogen production component are used in conjunction with a method of producing hydrogen by electrolyzing water, wherein the production of hydrogen is convenient, fast and safe, and is not prone to combustion and explosion problems, an assembly component, wherein the assembly component is fixed on the right side of the test box and is used to fix the hydrogen sensor, wherein multiple sets of hydrogen sensors can be inserted into the assembly component to improve the testing efficiency of the hydrogen sensor, and an expansion component, wherein the expansion component is sleeved on the upper surface of the test box, and the interference component emits interference gas to simulate a real environment, thereby testing the anti-interference ability and anti-false alarm ability of the hydrogen sensor, and making the test results of the hydrogen sensor more reliable and comprehensive.

[0005] It can be seen from the above patent that in the prior art, in order to improve the test efficiency of hydrogen sensors, gas is usually made to flow quickly through the hydrogen sensor for detection. However, the high-speed flow of gas will affect the sensor's accurate judgment of the hydrogen concentration. Moreover, when high-concentration hydrogen passes through and impacts the hydrogen sensor quickly, it may cause the hydrogen sensor to be poisoned. Summary of the invention

[0006] The purpose of the present invention is to provide a hydrogen sensor testing device to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A hydrogen sensor testing device comprises a test cylinder and a sensor body fixed in the test cylinder, a plurality of air inlet holes are provided on the lower side of the test cylinder, a baffle plate is slidably installed in the test cylinder, and a one-way opening component is provided on the baffle plate;

[0009] When the blocking plate slides upward, the sensor body is pressed to push open the one-way opening component so as to detect the gas entering from the air inlet hole.

[0010] In the above-mentioned hydrogen sensor testing device, a testing cavity is formed in the testing cylinder, and the blocking plate divides the testing cavity into an air intake cavity and a containing cavity. The air intake cavity is located below the containing cavity, and the air intake hole is connected to the air intake cavity.

[0011] In the above-mentioned hydrogen sensor testing device, an electric push rod is fixedly arranged in the accommodating chamber, and the movable end of the electric push rod is connected to the top of the baffle plate.

[0012] In the above-mentioned hydrogen sensor testing device, a sliding sealing ring is sleeved on the outer side of the baffle plate, and the sliding sealing ring is pressed against the inner wall of the test cavity to form a dynamic seal.

[0013] In the above-mentioned hydrogen sensor testing device, the one-way opening component includes a connecting hole opened on the blocking plate, a one-way motion block is slidably installed in the connecting hole, the connecting hole and the one-way motion block are both inverted T-shaped, and a connecting spring is connected between the one-way motion block and the connecting hole.

[0014] In the above-mentioned hydrogen sensor testing device, the sensor body includes a probe, and the probe and the unidirectional motion block are arranged in a corresponding matching manner, and the probe and the unidirectional motion block are in the same axial direction.

[0015] In the above-mentioned hydrogen sensor testing device, the thickness of the baffle plate is greater than the maximum distance between the air inlet and the bottom wall of the testing chamber.

[0016] In the above-mentioned hydrogen sensor testing device, two top blocks are formed on the upper end of the unidirectional motion block, and the distance between the top blocks is not greater than the diameter of the probe.

[0017] In the above-mentioned hydrogen sensor testing device, a sliding groove is provided on the inner wall of the test cylinder, the sliding groove passes through the air inlet hole and the width of the sliding groove is greater than the diameter of the air inlet hole, a sealing member is slidably installed in the sliding groove, the sealing member is L-shaped, a through hole is provided on the lower side of the sealing member, the through hole and the air inlet hole are arranged in a corresponding manner, the centers of the two are on the same axis in the initial state, the diameter of the through hole is greater than the diameter of the air inlet hole, and a limiting spring is connected between the top of the sealing member and the sliding groove.

[0018] In the above-mentioned hydrogen sensor testing device, the through hole divides the sealing member into a sliding portion and a blocking portion, the sliding portion is located above the axis of the through hole, and the sliding portion is located below the axis of the through hole.

[0019] In the above technical scheme, the present invention provides a hydrogen sensor testing device. When the ambient gas is sucked into the air inlet, the hydrogen sensor and the ambient gas in the test tube are blocked by the blocking plate, thereby preventing the high-speed flowing gas from impacting the hydrogen sensor. When the blocking plate rises to a certain height, the fixed hydrogen sensor pushes away the one-way opening component, so that the hydrogen sensor contacts the stable ambient gas, thereby detecting the ambient gas and avoiding poisoning of the hydrogen sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application 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 recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a hydrogen sensor testing device provided in one embodiment of the present invention.

[0022] Figure 2 A cross-sectional view of a hydrogen sensor testing device provided by an embodiment of the present invention.

[0023] Figure 3 A cross-sectional view of a hydrogen sensor testing device provided in another embodiment of the present invention.

[0024] Figure 4 For the present invention Figure 3 A local enlarged view of point X.

[0025] Figure 5 For the present invention Figure 3 A partial enlarged view of point Y.

[0026] Figure 6A cross-sectional view of a hydrogen sensor testing device provided in yet another embodiment of the present invention.

[0027] Figure 7 A cross-sectional view of a hydrogen sensor testing device provided in yet another embodiment of the present invention.

[0028] Figure 8 For the present invention Figure 7 A local enlarged view of point P.

[0029] Fig. 9 For the present invention Figure 7 A partial enlarged view of point Z.

[0030] Fig.10 A partial three-dimensional structural schematic diagram of a hydrogen sensor testing device provided in yet another embodiment of the present invention.

[0031] Fig.11 For the present invention Fig.10 A local enlarged view of point T.

[0032] Fig.12 A partial three-dimensional structural schematic diagram of a hydrogen sensor testing device provided in yet another embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Test tube; 11. Air inlet hole; 12. Blocking plate; 121. Buffer part; 122. Spring rod; 123. Ring part; 124. Spiral section; 125. Stop part; 13. One-way opening component; 131. Connecting hole; 132. One-way moving block; 133. Connecting spring; 134. Top block; 135. Circular groove; 136. Connecting rod; 137. Moving circular plate; 138. Spiral protrusion; 139. Snap-on groove; 140. Snap-on block; 14. Test chamber; 141. Air inlet chamber; 142. Accommodating chamber; 143. Electric push rod; 15. Sliding groove; 16. Seal; 161. Sliding part; 162. Blocking part; 17. Through hole; 18. Limit spring; 2. Sensor body; 21. Probe. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] In order to test the performance of the hydrogen sensor, it is necessary to detect hydrogen under various conditions, including different concentrations of hydrogen. Generally speaking, the low concentration range refers to the hydrogen concentration range of 0-1000ppm, and the high concentration range refers to the hydrogen concentration range of 4-100%. In each embodiment of the present invention, it is necessary to detect the concentration of hydrogen in the high concentration range. This measurement range is suitable for scenes such as furnace front detection or hydrogen explosion hazard detection.

[0037] like Figure 1-12 As shown, a hydrogen sensor testing device provided by an embodiment of the present invention comprises a testing cylinder 1 and a sensor body 2 fixed in the testing cylinder 1, a plurality of air inlet holes 11 are provided on the lower side of the testing cylinder 1, a baffle plate 12 is slidably installed in the testing cylinder 1, a one-way opening component 13 is provided on the baffle plate 12; when the baffle plate 12 slides upward, the sensor body 2 is squeezed to push open the one-way opening component 13 so as to detect the gas entering from the air inlet hole 11.

[0038] Specifically in the present embodiment, the test cylinder 1 is a cylindrical cylinder, and both ends of the test cylinder 1 are closed, the upper end of the test cylinder 1 is a detachable seal, and a cylindrical cavity is formed in the cylindrical cylinder; the sensor body 2 is located on the upper side of the test cylinder 1. This is because the density of hydrogen is smaller than that of air, and the hydrogen entering the test cylinder 1 will move upward, which is convenient for the sensor body 2 to detect hydrogen. In addition, the sensor body 2 is a prior art and will not be described in detail here; the air inlet 11 can be square or circular, preferably circular, and the air inlet 11 is opened on the lower side of the outer wall of the test cylinder 1. The preferred arrangement of the air inlet 11 is that multiple air inlet holes 11 are evenly arranged axially along the outer wall of the test cylinder 1, so as to facilitate the inhalation of gas from multiple positions in the environment for detection; the baffle plate 12 is preferably a circular plate and the baffle plate 12 is dynamically sealed and connected to the inner wall of the test cylinder 1, that is, when the baffle plate 12 slides in the test cylinder 1, the baffle plate 12 is under The gas in the test tube 1 will not move to the top of the baffle plate 12, and the horizontal height of the baffle plate 12 is always not less than the horizontal height of the air inlet 11. When the baffle plate 12 slides upward in the test tube 1, the ambient gas is quickly sucked in from the air inlet 11. When the baffle plate 12 slides downward in the test tube 1, the original gas in the test tube 1 is discharged from the air inlet 11. The one-way opening component 13 is located in the middle of the baffle plate 12. The one-way opening component 13 can only be opened in one direction. In this embodiment, it can only be opened when receiving downward pressure. When the baffle plate 12 rises to a certain height, the sensor body 2 contacts the one-way opening component 13 and continues to move the baffle plate 12 upward, so that the sensor body 2 can push the one-way opening component 13 to move and make the sensor body 2 contact with the sucked ambient gas to detect the ambient gas. It should be noted that in this embodiment, the sensor body 2 extends to the bottom of the baffle plate 12 for detection, rather than the ambient gas entering the top of the baffle plate 12.

[0039] In a complete working process (the test tube 1 is located in a high concentration of hydrogen), the baffle plate 12 has four working modes: in the first working mode, the baffle plate 12 is attached to the bottom wall inside the test tube 1, that is, at this time, there is no ambient gas in the test tube 1, and the edge of the baffle plate 12 blocks the air inlet 11; in the second working mode, the baffle plate 12 slides upward, and at this time, the volume of the space below the baffle plate 12 becomes larger, so that the ambient gas is sucked in from the air inlet 11; in the third working mode, the one-way opening component 13 contacts the sensor body 2, the baffle plate 12 continues to move upward, and the sensor body 2 pushes the one-way opening component 13 away, so that the sensor body 2 contacts the ambient gas below the baffle plate 12 for hydrogen detection; in the fourth working mode, when the sensor body 2 is tested, the baffle plate 12 moves downward to discharge the tested ambient gas, and the baffle plate 12 is again attached to the bottom wall inside the test tube 1.

[0040] In this way, the main function of the baffle plate 12 is to separate the inhaled ambient gas from the sensor body 2 first, so as to prevent the high concentration of hydrogen from directly impacting the sensor body 2 and causing poisoning thereof, while also being able to detect stable ambient gas; in addition, the upward movement of the baffle plate 12 can quickly inhale ambient gas, avoiding the need to set up an additional power source; and, when the baffle plate 12 moves downward, the gas originally in the test tube 1 can also be discharged, so as to prevent the gas originally in the test tube 1 from mixing with the inhaled gas, thereby ensuring the accuracy of the detection; all of the above working modes correspond to the technical effects to be achieved in this embodiment.

[0041] In another embodiment provided by the present invention, a test chamber 14 is formed in the test tube 1, and the baffle plate 12 divides the test chamber 14 into an air inlet chamber 141 and a accommodating chamber 142. That is to say, when the baffle plate 12 moves, the volumes of the air inlet chamber 141 and the accommodating chamber 142 change accordingly. The air inlet chamber 141 is located below the accommodating chamber 142, and the air inlet hole 11 is connected to the air inlet chamber 141. The accommodating chamber 142 is used to install the sensor body 2. When the volume of the air inlet chamber 141 decreases, the gas in the air inlet chamber 141 is discharged from the air inlet hole 11, and when the volume of the air inlet chamber 141 increases, the ambient gas is inhaled.

[0042] In another embodiment provided by the present invention, an electric push rod 143 is fixedly provided in the accommodating chamber 142, and the movable end of the electric push rod 143 is connected to the top of the blocking plate 12. The electric push rod 143 drives the blocking plate 12 to slide in the vertical direction in the test tube 1 to complete the suction of ambient gas and the discharge of original gas.

[0043] In another embodiment provided by the present invention, a sliding sealing ring (not shown in the figure) is sleeved on the outer side of the baffle plate 12, and the sliding sealing ring is pressed against the inner wall of the test chamber 14 to form a dynamic seal to ensure that the gas in the air inlet chamber 141 will not be input into the accommodating chamber 142.

[0044] In another embodiment provided by the present invention, the one-way opening component 13 includes a connecting hole 131 opened on the blocking plate 12, and a one-way motion block 132 is slidably installed in the connecting hole 131. The connecting hole 131 and the one-way motion block 132 are both inverted T-shaped, and a connecting spring 133 is connected between the one-way motion block 132 and the connecting hole 131. Under the elastic action of the connecting spring 133, in the initial state, the lower end of the connecting hole 131 and the lower end of the one-way motion block 132 are on the same horizontal plane. When the one-way motion block 132 is subjected to downward pressure (at this time, the downward pressure is the resistance of the sensor body 2), the one-way motion block 132 will slide downward in the connecting hole 131 and stretch the connecting spring 133. When the one-way motion block 132 moves as a whole to below the blocking plate 12, the one-way opening component 13 is opened. At this time, the ambient gas can be detected through the sensor body 2.

[0045] In another embodiment provided by the present invention, the sensor body 2 includes a probe 21. The probe 21 is a prior art and will not be described in detail herein. It is mainly used to sense the presence and concentration of hydrogen. The probe 21 and the unidirectional motion block 132 are correspondingly arranged. The probe 21 and the unidirectional motion block 132 are in the same axial direction. The probe 21 is preferably cylindrical, and the axis of the probe 21 coincides with the axis of the unidirectional motion block 132. In the prior art, the probe 21 is mostly cylindrical, and the diameter of the probe 21 is equal to the upper diameter of the connecting hole 131. In this embodiment, an elastic layer such as a rubber layer is preferably provided on the outer peripheral surface of the probe 21. That is to say, when the probe 21 passes through the connecting hole 131 and reaches the bottom of the baffle plate 12, the elastic layer can also seal the connecting hole 131, thereby reducing or even preventing the gas in the air inlet cavity 141 from moving into the accommodating cavity 142.

[0046] In another embodiment provided by the present invention, the thickness of the baffle plate 12 is greater than the maximum distance between the air inlet 11 and the bottom wall of the test chamber 14, so that when the lower end of the baffle plate 12 is completely attached to the bottom wall of the test chamber 14, the side wall of the baffle plate 12 can completely cover the air inlet 11, ensuring that the original gas in the air inlet chamber 141 is completely discharged.

[0047] In another embodiment provided by the present invention, two top blocks 134 are formed on the upper end of the unidirectional motion block 132, and the distance between the top blocks 134 is not greater than the diameter of the probe 21. The two top blocks 134 are preferably arranged relative to each other. The function of the top blocks 134 is to ensure a certain distance between the bottom of the probe 21 and the top of the unidirectional motion block 132. The top blocks 134 are used to abut the shell part of the edge of the probe 21, so as to facilitate the detection part of the probe 21 to detect the ambient gas.

[0048] In another embodiment provided by the present invention, a sliding groove 15 is provided on the inner wall of the test cylinder 1, and the sliding groove 15 passes through the air inlet hole 11 and the width of the sliding groove 15 is greater than the diameter of the air inlet hole 11. A sealing member 16 is slidably installed in the sliding groove 15, and the width of the sealing member 16 is greater than the diameter of the air inlet hole 11. That is to say, when the sealing member 16 covers the air inlet hole 11, a seal for the air inlet hole 11 can be formed. The sealing member 16 is L-shaped, and the sealing member 16 consists of a horizontal section and a vertical section. The horizontal section is located at one end of the upper side of the vertical section close to the test cavity 14, and the horizontal section is correspondingly matched with the blocking plate 12. When the blocking plate 12 rises to a certain height, it will contact with the horizontal section and push the horizontal section to move upward. A through hole 17 is provided on the lower side of the sealing member 16, and the through hole 17 is correspondingly matched with the air inlet hole 11. In the initial state, the centers of the two are on the same axis. 7 has a diameter greater than that of the air inlet hole 11. At this time, the through hole 17 is connected to the air inlet hole 11, and a limit spring 18 is connected between the top of the seal 16 and the sliding groove 15. The limit spring 18 is used to maintain the initial state of the seal 16. In this embodiment, in the initial state, under the elastic action of the limit spring 18, the through hole 17 is connected to the air inlet hole 11, and the ambient gas enters the air inlet chamber 141 through the air inlet hole 11 and the through hole 17. When the blocking plate 12 rises to a certain height, it begins to contact the horizontal section of the seal 16, pushing the seal 16 to move upward, so that the bottom of the seal 16 moves upward for a distance to compress the limit spring 18, and the air inlet hole 11 is blocked by the seal 16. In this way, the movement of the blocking plate 12 is used to passively seal the test tube 1, so that the ambient gas entering the test tube 1 is in a closed environment and does not contact the outside world, thereby avoiding the exchange of ambient gas in the test tube 1 with external gas during testing.

[0049] In another embodiment provided by the present invention, the through hole 17 divides the sealing member 16 into a sliding portion 161 and a blocking portion 162, wherein the sliding portion 161 is located above the axis of the through hole 17, and the sliding portion 161 is located below the axis of the through hole 17. When the sealing member 16 moves upward to a certain height, the blocking portion 162 moves to the air inlet 11 to form a seal, and the sliding portion 161 is used to utilize the movement of the baffle plate 12 to drive the overall movement of the sealing member 16.

[0050] For further information, see Figure 6 A buffer portion 121 is slidably passed through the blocking plate 12. The buffer portion 121 can be a square structure or an arc structure, preferably a square structure. A spring rod 122 is connected between the upper end of the buffer portion 121 and the blocking plate 12. The spring rod 122 is used to maintain the initial state of the buffer portion 121 and provide a buffering effect. When the blocking plate 12 is pressed against the bottom wall of the test cavity 14, the bottom of the buffer portion 121 and the bottom of the blocking plate 12 are located in the same horizontal plane. The buffer portion 121 is provided to buffer the contact between the blocking plate 12 and the bottom wall of the test cavity 14. When the electric push rod 143 pushes the blocking plate 12 to move downward, the buffer portion 121 first contacts the bottom wall of the test cavity 14 and is blocked. At this time, the buffer portion 121 slides upward on the blocking plate 12 and stretches the spring rod 122. In this way, the elastic contact between the blocking plate 12 and the bottom wall of the test cavity 14 is achieved.

[0051] Further, refer to Figure 7-10After the ambient gas is sucked into the test chamber 14, it tends to be in a stable state, which is not convenient for the sensor body 2 to detect. To this end, this embodiment provides a further solution to solve the above technical problems. In this embodiment, it is particularly important to note that the blocking plate 12 is no longer fixed to the movable end of the electric push rod 143, and an annular portion 123 is rotatably mounted on the blocking plate 12. The annular portion 123 is an annular structural member, and a reset torsion spring (not shown in the figure) is connected between the annular portion 123 and the blocking plate 12. The reset torsion spring is used to maintain the initial state between the annular portion 123 and the blocking plate 12. The movable end of the electric push rod 143 is fixed on the annular portion 123, that is, the blocking plate 12 can rotate at this time. The upper end of the blocking plate 12 is also fixed with a spiral section 124. The angle occupied by the spiral section 124 is preferably 90 degrees. The central axis of the spiral section 124 coincides with the central axis of the blocking plate 12. The spiral section 124 and the horizontal section of the sealing member 16 are correspondingly arranged. When the spiral section 124 follows the blocking plate 12 upward, the sealing member 16 is rotated. When the movement reaches a certain distance, the spiral section 124 will contact the horizontal section of the seal 16; when the baffle plate 12 rises to a certain height, the highest position of the spiral section 124 begins to contact the horizontal section of the seal 16, and the baffle plate 12 continues to move upward. At this time, the spiral section 124 begins to squeeze the seal 16 upward and push the seal 16 to move upward. The pressure on the limit spring 18 gradually increases, and the spiral section 124 begins to drive the baffle plate 12 to move. The force on the reset torsion spring also gradually increases. When the force on the limit spring 18 reaches a certain size, the reset torsion spring begins to twist, and the spiral section 124 and the baffle plate 12 also begin to rotate. When the baffle plate 12 rotates, the buffer part 121 rotates to stir the ambient gas in the test chamber 14, which is convenient for the sensor body 2 to detect. At this time, the buffer part 121 not only has a buffering effect, but also can stir the gas, so that the detection result of the sensor body 2 is more accurate. In this embodiment, the ambient gas is stirred, and the phenomenon of gas impacting the sensor body 2 will not occur.

[0052] See also Figure 7-10When the probe 21 extends into the air inlet cavity 141, the one-way motion block 132 needs to be pushed open. Since the diameter of the probe 21 is equal to the upper diameter of the connecting hole 131, a seal is naturally formed. However, in order to ensure that the detection part of the probe 21 can smoothly detect the ambient gas, the top block 134 needs to be involved. When the probe 21 pushes the one-way motion block 132, there is a gap between the probe 21 and the top of the one-way motion block 132. The space formed by the gap is defined as the gas retention space. When the probe 21 is in contact with the air inlet cavity 141, the one-way motion block 132 is pushed open. When the gas in the sensor body 2 contacts the top block 134, the top block 134 is pushed away to the bottom of the baffle plate 12, and the gas retention space is also located in the air inlet cavity 141. When the baffle plate 12 moves downward and the one-way moving block 132 is reset, the gas retention space moves into the receiving cavity 142, and the hydrogen retained in the gas retention space also moves into the receiving cavity 142. After multiple tests, the hydrogen concentration in the receiving cavity 142 will rise rapidly, interfering with the operation of the sensor body 2. For this reason, this embodiment provides a further solution, and it is particularly important to explain that In this embodiment, the top block 134 is no longer fixed on the one-way motion block 132. A circular groove 135 is formed on the upper end of the one-way motion block 132. A connecting rod 136 is fixed to the middle of the bottom wall of the circular groove 135. A circular partition is formed on the upper end of the connecting rod 136. The upper end of the partition is located in the same plane as the upper end of the one-way motion block 132. A moving circular plate 137 is slidably mounted on the connecting rod 136. The top block 134 is fixed to the outer side of the upper end of the moving circular plate 137, and the top block 134 does not extend to the circular groove 1 35, a spiral groove is provided in the circular groove 135, a spiral protrusion 138 is formed on the outer wall of the top block 134, the spiral protrusion 138 and the spiral groove are screwed together, in addition, a clamping groove 139 is provided at the upper end of the top block 134, a clamping block 140 is fixed to the bottom of the probe 21, the clamping block 140 and the clamping groove 139 are correspondingly arranged, and the two can be plugged into each other, when the clamping block 140 is plugged into the clamping groove 139, the top block 134 can no longer rotate with the unidirectional motion block 132.

[0053] Specifically, during operation, the probe 21 pushes the one-way motion block 132 to have four motion strokes, which are sequentially divided into a synchronous motion stroke, an ejection stroke, a retraction stroke, and a reset stroke. During the synchronous motion stroke, the blocking plate 12 moves upward and inserts the clamping block 140 into the clamping groove 139, and the blocking plate 12 continues to move upward, so that the probe 21 is tightly attached to the one-way motion block 132 and pushes the one-way motion block 132 to slide under the blocking plate 12 (this motion process is relative to the probe 21). At this time, the one-way motion block 132 and the ejection block 134 move synchronously; during the ejection stroke, the blocking plate 12 continues to move upward, and when the upper end of the one-way motion block 132 and the lower end of the blocking plate 12 are in the same horizontal plane, The blocking plate 12 and the one-way moving block 132 begin to rotate (corresponding to the mutual compression between the spiral section 124 and the sealing member 16). However, since the clamping block 140 is inserted into the clamping groove 139, the top block 134 cannot rotate, that is, the moving circular plate 137 cannot rotate. Since the spiral protrusion 138 is screwed on the spiral groove, the moving circular plate 137 is slidably mounted on the connecting rod 136. Therefore, the moving circular plate 137 can only slide upward along the connecting rod 136 and make the top block 134 move toward the circular groove 135. The outer movement of the probe 21 pushes the bottom of the probe 21 and the upper end of the one-way motion block 132 to separate, so that there is a distance between the bottom of the probe 21 and the upper end of the one-way motion block 132, which is convenient for the detection part of the probe 21 to detect the ambient gas; during the contraction stroke, when the detection is completed, the blocking plate 12 is driven by the electric push rod 143 to move downward rapidly. At this time, the spiral section 124 and the sealing member 16 are no longer squeezed against each other. Under the elastic action of the reset torsion spring, the blocking plate 12 rotates and resets. Therefore, as can be seen from the above-mentioned ejection stroke, the one-way motion block 132 is The motion block 132 rotates in the opposite direction and drives the distance between the bottom of the probe 21 and the upper end of the unidirectional motion block 132 to decrease. When the upper end of the unidirectional motion block 132 and the lower end of the baffle plate 12 are in the same horizontal plane, the probe 21 is tightly attached to the unidirectional motion block 132. In this way, the volume of the gas retention space is zero, and the unidirectional motion block 132 will not drive the ambient gas into the accommodating chamber 142 even if it moves upward. The reset stroke refers to the reset of the unidirectional motion block 132 under the elastic action of the connecting spring 133 to prepare for the next work. In this way, through the above technical solution, the top block 134 can be extended when detecting gas and retracted when resetting. While ensuring that the detection part of the probe 21 can detect the ambient gas, it can also prevent the hydrogen retained in the gas retention space from moving into the accommodating chamber 142.

[0054] Further, refer to Fig. 9In order to avoid the gas in the test tube 1 from exchanging with the external gas during the test, the through hole 17 is usually sealed before the probe 21 is brought into contact with the inhaled gas. In the above technical solution, the probe 21 can push the one-way opening component 13 to contact with the inhaled gas only after the baffle plate 12 moves upward to seal the through hole 17 by the blocking portion 162. That is to say, after the through hole 17 is sealed, the baffle plate 12 still needs to move upward for a distance before the probe 21 can extend out of the baffle plate 12. In this process, the volume of the air inlet cavity 141 increases but air cannot be taken in. The air inlet cavity 141 will experience a decrease in pressure and a decrease in gas density, which seriously affects the detection of hydrogen. For this reason, this embodiment A further solution is provided, in which a stopper 125 is fixed in the accommodating cavity 142, and the stopper 125 and the buffer 121 are correspondingly arranged. When the air inlet 11 is just completely sealed, the stopper 125 and the buffer 121 are just in contact with each other. At this time, when the baffle plate 12 moves upward again to extend the probe 21, the buffer 121 is blocked by the stopper 125, and the lower end of the buffer 121 also extends into the air inlet cavity 141, thereby reducing the volume of gas that the air inlet cavity 141 can accommodate. In other words, the downward movement of the buffer 121 can eliminate part of the adverse effects caused by the increase in the volume of the air inlet cavity 141, reduce the reduction in gas density, and ensure the accuracy of hydrogen detection.

[0055] To achieve the above functions, see Figure 7 , it is necessary to further design the blocking portion 162. The lower end of the blocking portion 162 penetrates the bottom wall of the test tube 1 and extends to the outside. This is to increase the length of the blocking portion 162 and ensure that the blocking portion 162 can always seal the air inlet 11 when it moves.

[0056] Furthermore, it should be noted that, in the above-mentioned embodiment, even if the stopper 125 is not provided, the buffer portion 121 will automatically extend downward due to the reduction in the pressure of the air inlet chamber 141. In the present invention, the main function of the buffer portion 121 is to achieve elastic contact between the baffle plate 12 and the bottom wall of the test chamber 14. In addition, the buffer portion 121 can also stir the gas and automatically move downward at an appropriate time to eliminate a portion of the adverse effects caused by the increase in the volume of the air inlet chamber 141.

[0057] Obviously, when the electric push rod 143 pushes the baffle plate 12 to move downward, the volume of the accommodating chamber 142 also increases accordingly. However, if a through hole is opened on the accommodating chamber 142 to achieve air intake or exhaust, it will also affect the diameter of the gas near the air inlet 11. For this reason, the best choice is still to make the accommodating chamber 142 in a sealed state, because when the baffle plate 12 moves downward, the volume of the accommodating chamber 142 increases, the pressure of the accommodating chamber 142 decreases, and the buffer portion 121 will automatically extend upward to reduce the pressure change of the accommodating chamber 142.

[0058] Preferably, refer to Fig.10 The shape of the buffer portion 121 can be further improved to increase its volume, so as to better eliminate the adverse effects caused by the increase in the volume of a portion of the air inlet cavity 141. In the present embodiment, the buffer portion 121 is a semi-annular structure, and when the buffer portion 121 extends downward, it can occupy more volume of the air inlet cavity 141. In addition, a volume expansion unit can be provided at the lower end of the buffer portion 121. The longer the buffer portion 121 extends, the larger the space that the volume expansion unit can occupy. Of course, this can be implemented by those skilled in the art, and will not be elaborated on here.

[0059] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A hydrogen sensor testing device, comprising a test tube and a sensor body fixed in the test tube, wherein the sensor body is used to detect hydrogen in a high concentration range, wherein the high concentration range refers to a hydrogen concentration range of 4-100%, characterized in that: A plurality of air inlet holes are provided at the lower side of the test cylinder, a blocking plate is slidably installed in the test cylinder, and a one-way opening component is provided on the blocking plate; When the blocking plate slides upward, the sensor body is pressed to push open the one-way opening component so as to detect the gas entering from the air inlet hole; A test cavity is formed in the test cylinder, and the baffle plate divides the test cavity into an air inlet cavity and a receiving cavity. The air inlet cavity is located below the receiving cavity, and the air inlet hole is connected to the air inlet cavity. An electric push rod is fixed in the accommodating cavity, and a movable end of the electric push rod is connected to the top of the blocking plate; A sliding sealing ring is sleeved on the outer side of the baffle plate, and the sliding sealing ring is pressed against the inner wall of the test cavity to form a dynamic seal; The one-way opening assembly comprises a connecting hole provided on the blocking plate, a one-way motion block is slidably installed in the connecting hole, the connecting hole and the one-way motion block are both inverted T-shaped, and a connecting spring is connected between the one-way motion block and the connecting hole; The sensor body comprises a probe, the diameter of the probe is equal to the diameter of the upper side of the connecting hole, the probe and the one-way motion block are arranged in a corresponding matching manner, and the probe and the one-way motion block are in the same axial direction; The upper end of the one-way motion block is provided with a circular groove, the middle part of the bottom wall of the circular groove is fixedly connected to a connecting rod, the upper end of the connecting rod is formed with a circular partition, the upper end of the partition and the upper end of the one-way motion block are located in the same plane, a movable circular plate is slidably mounted on the connecting rod, a top block is fixedly connected to the outer side of the upper end of the movable circular plate, the top block does not extend out of the circular groove, a spiral groove is provided in the circular groove, a spiral protrusion is formed on the outer side wall of the top block, the spiral protrusion and the spiral groove are screwed together, a clamping groove is provided at the upper end of the top block, a clamping block is fixed to the bottom of the probe, the clamping block and the clamping groove are correspondingly arranged, and when the clamping block is inserted in the clamping groove, the top block can no longer rotate with the one-way motion block; A sliding groove is provided on the inner wall of the test cylinder, a sealing member is slidably installed in the sliding groove, the sealing member is L-shaped, a limit spring is connected between the top of the sealing member and the sliding groove, the sealing member is composed of a horizontal section and a vertical section, the horizontal section is located on the upper side of the vertical section close to one end of the test cavity; An annular portion is rotatably mounted on the blocking plate, and the annular portion is an annular structural member. A reset torsion spring is connected between the annular portion and the blocking plate, and the reset torsion spring is used to maintain the initial state between the annular portion and the blocking plate. The movable end of the electric push rod is fixed on the annular portion, and a spiral section is also fixed to the upper end of the blocking plate. The angle occupied by the spiral section is 90 degrees, and the central axis of the spiral section coincides with the central axis of the blocking plate. The spiral section and the horizontal section of the seal are correspondingly arranged. When the spiral section moves upward with the blocking plate to a certain distance, the highest position of the spiral section begins to contact the horizontal section of the seal and pushes the seal to move upward; During the upward movement of the blocking plate, the clamping block can be inserted into the clamping groove so that the probe is closely attached to the unidirectional moving block.

2. A hydrogen sensor testing device according to claim 1, characterized in that: The thickness of the blocking plate is greater than the maximum distance between the air inlet and the bottom wall of the test chamber.

3. A hydrogen sensor testing device according to claim 1, characterized in that: Two top blocks are formed on the upper end of the unidirectional motion block, and the distance between the top blocks is no greater than the diameter of the probe.

4. A hydrogen sensor testing device according to claim 1, characterized in that: The sliding groove passes through the air inlet hole and the width of the sliding groove is greater than the diameter of the air inlet hole. A through hole is opened on the lower side of the sealing component. The through hole and the air inlet hole are arranged in a corresponding manner. In the initial state, the centers of the two are on the same axis, and the diameter of the through hole is greater than the diameter of the air inlet hole.

5. A hydrogen sensor testing device according to claim 4, characterized in that: The through hole divides the sealing member into a sliding portion and a blocking portion, wherein the sliding portion is located above the axis of the through hole, and the blocking portion is located below the axis of the through hole.

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