Oxygen sensing unit

Abstract

The utility model discloses an oxygen sensing unit (100) which is used for monitoring oxygen partial pressure of a circulation gas circuit of diving breathing equipment. A shell (110) is provided with an air outlet port, an air inlet port and a sealing end, a partition plate is integrally arranged in the shell, and a compartment is formed at the sealing end. And the compartments are provided with cable through holes. The main body of the oxygen sensor (130) is located in the compartment, the head of the oxygen sensor is embedded in the mounting through hole of the partition plate, and only the head of the oxygen sensor is exposed to airflow. When the oxygen sensing unit is arranged at the downstream of the inspiration buffer bag, interference of accidental water leakage on a detection signal can be avoided.

Description

Technical Field

[0001] The present application relates to diving breathing equipment, and in particular to an oxygen sensing unit for a diving breathing circulation gas circuit. Background Art

[0002] Closed-circuit breathing apparatus (CCB) used in military or engineering applications consists of a breathing circuit consisting of a gas purifier, an inhalation cushion bag, a mouthpiece valve, an exhalation cushion bag, and piping components. Oxygen and nitrogen are supplied from high-pressure cylinders, and oxygen partial pressure is monitored using an oxygen sensor and a wrist-worn meter. The oxygen sensor is typically located at the outlet of the gas purifier. Purified gas enters the inhalation cushion bag, mixing it with the remaining gas in the bag.

[0003] If the oxygen sensor is located downstream of the inhalation buffer bag, the test data will be more accurate. However, during diving training or in an emergency, water may flow back from the mouthpiece valve into the inhalation tube and interfere with the oxygen sensor. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to improve the oxygen sensor unit located downstream of the inhalation buffer bag to improve reliability.

[0005] The utility model discloses an oxygen sensing unit.

[0006] The oxygen sensing unit is used to monitor the oxygen partial pressure of the circulating gas circuit of the diving breathing apparatus. The circulating gas circuit includes an inhalation buffer bag and an inhalation tube. The inhalation buffer bag is provided with an air outlet end seat. The oxygen sensing unit includes a housing and three oxygen sensors.

[0007] The housing is provided with an air outlet port for installing the air intake pipe, an air inlet port for assembling on the air outlet end seat, and a sealing end sealed by a sealing cover;

[0008] The housing is provided with a partition plate integrally therein to form a compartment at the sealed end, and the compartment is provided with a cable through hole;

[0009] The oxygen sensor has a main body located in the compartment, a head portion of the sensor is embedded in the mounting through hole of the partition and exposed to the airflow, and a wire at the tail portion is led out from the cable through hole.

[0010] In some embodiments of the present application, it can be selected that the shell has a cylindrical main body, the side wall is provided with the air outlet port, one end in the direction of the central axis is set as the air inlet port, and the other end in the direction of the central axis is set as the sealing end; the partition is perpendicular to the central axis of the shell, facing the air outlet port, and the part close to the air outlet port protrudes toward the sealing end to avoid the air outlet port.

[0011] In some embodiments of the present application, the inner wall edge of the compartment corresponding to the cable through hole can be configured as an inner wall boss to facilitate assembly of a cable connector; the oxygen sensor unit further comprises a panel, which is integrally and vertically arranged on the partition, surrounding the inner wall boss to form a redundant cable interlayer.

[0012] By implementing the technical solution of this utility model, the following beneficial effects can be achieved:

[0013] The oxygen sensor unit disclosed in this utility model is used to monitor the oxygen partial pressure in the circulating air circuit of a diving breathing apparatus. Its housing is equipped with an outlet port, an inlet port, and a sealed end. A partition is integrated within the housing to form a compartment at the sealed end. The compartment is provided with a cable through-hole. The oxygen sensor's main body is located within the compartment, with its head embedded in the mounting hole of the partition, exposing only the head to the airflow. When positioned downstream of the inhalation buffer bag, this oxygen sensor unit can prevent interference with the detection signal from accidental water leaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following drawings should be used in conjunction with the detailed description.

[0015] Figure 1 1 is a diagram showing the oxygen sensor unit in use in Example 1, wherein the hollow arrows represent the flow direction of the circulating gas d, and the black arrows represent the transmission direction of the sensor signal;

[0016] Figure 2 1 is an exploded view of the assembly of the oxygen sensor unit and the outlet end seat in Example 1, wherein the central axis indicated by the auxiliary line is marked as Y0;

[0017] Figure 3 This is a projection of the closed end of the shell in Example 1, with the cover removed to show the interior of the compartment. The intersection of the two orthogonal auxiliary lines corresponds to Figure 2 The central axis Y0 in

[0018] Figure 4 This is a perspective view of the housing in Example 1, with the cover removed to reveal the interior of the compartment;

[0019] Figure 5 Another perspective view of the housing in the first embodiment, showing the interior of the air inlet port;

[0020] Figure 6 This is a three-dimensional view of the cover in Example 1, showing the inner side surface. DETAILED DESCRIPTION

[0021] The following describes embodiments with reference to the accompanying drawings.

[0022] In this specification, unless otherwise specified, "one embodiment", "some embodiments" and "other embodiments" are used to distinguish different embodiments and do not refer to all embodiments. The accompanying drawings are schematic diagrams, not scale drawings. The directions / positions indicated by top, bottom, center, edge, inside, outside, far, near, length, width, vertical, horizontal, up, down, front, back, left, right, etc. are based on the observation angle of the accompanying drawings and cannot be understood as the components / devices being located in specific positions or facing specific directions. Ordinal words such as first, second, third, etc. do not have a sequential meaning when used to distinguish components / devices with the same function / name.

[0023] Example 1

[0024] An oxygen sensing cell 100 is disclosed.

[0025] See also Figure 1 The oxygen sensor unit 100 is used to monitor the oxygen partial pressure in the recirculating air circuit of a diving breathing apparatus. This recirculating air circuit includes components such as a gas purifier, an inhalation buffer bag 200, an inhalation tube 300, a mouthpiece valve, an exhalation tube, and an exhalation buffer bag. The inhalation buffer bag 200 is provided with an outlet terminal 210. The oxygen sensor unit 100 is connected in series between the inhalation buffer bag 200 and the inhalation tube 300, separated from the mouthpiece valve by only the inhalation tube 200. The detection data from the oxygen sensor unit 100 is transmitted to a wrist-worn instrument. The wrist-worn instrument has a built-in air replenishment program module that controls the air replenishment process based on the detection data.

[0026] See also Figure 1 and Figure 2 The oxygen sensing unit 100 includes a housing 110 , three oxygen sensors 130 , a connecting rod 140 , a cable connection seat 150 , a connecting pipe 161 , an internally threaded collar 162 and a hose clamp 163 .

[0027] The housing 110 has a cylindrical main body. Three oxygen sensors 130 are installed in the housing 110 .

[0028] See also Figure 3 、 Figure 4 and Figure 5 The sidewall of the housing 110 is provided with an outlet port 111 for mounting the intake pipe 300. Specifically, an internally threaded collar 162 has an L-shaped circumferential cross-section and is movably assembled with the inner end of the connecting pipe 161 to form a single unit. It can be engaged with the outlet port 111, thereby securing the connecting pipe 161 to the housing 110. An annular groove is provided on the outer end of the connecting pipe 161 to accommodate a hose clamp 163, thereby enabling the intake pipe 200 to be sleeved thereon.

[0029] The housing 110 is provided with an air inlet port 112 at one end in the central axis direction so as to be assembled on the air outlet end seat 210. Specifically, the air inlet port 112 is threadedly engaged with the air outlet end seat 210.

[0030] The other end of the housing 110 in the central axis direction is provided as a sealed end 113. The sealed end 113 is provided with an opening and is detachably sealed by a cover 119.

[0031] A transverse partition plate 114 is integrally provided inside the housing 110 , thereby forming a compartment 110 a inside the sealing end 113 .

[0032] The sidewall of compartment 110a is provided with a cable through-hole 110b for routing cable 401. Leads extend from the tail 132 of each oxygen sensor 130, which converge into cable 401. The detection signals from the oxygen sensors 130 are transmitted via cable 401 to the wrist-worn instrument, where they are processed by the wrist-worn instrument's built-in gas replenishment program module.

[0033] The inner wall edge of the compartment 110a corresponding to the cable through hole 110b is provided with an inner wall boss 117 for assembling the cable connector 150. The cable connector 150 is used for plugging or locking the cable 401.

[0034] A vertically integrated enclosure 116 is formed on the side of the partition 114 facing the sealed end 113. This enclosure surrounds the inner wall boss 117, forming a redundant cable sandwich to confine the redundant cable 401 located within the compartment 110a. This redundant portion of cable 401 prevents accidental disconnection of the oxygen sensor wires.

[0035] The partition plate 114 is provided with a threaded through hole 114a and three mounting through holes 114b. The threaded through hole 114a is located in the center, and the three mounting through holes 114b are evenly distributed in the circumferential direction.

[0036] The three oxygen sensors 130, with their main bodies located within compartment 110a, are mounted with their heads correspondingly inset into the three mounting holes of bulkhead 114. Only the heads are exposed to the airflow to detect oxygen partial pressure. With this structure, the tails 132 and heads of the oxygen sensors 130 are located on either side of bulkhead 114, shielded from the airflow. Even in the event of an accident, such as water backflowing through the mouthpiece valve into the oxygen sensing unit 100 due to an unskilled diver, this will not interfere with or damage the oxygen sensors 130.

[0037] The cross-sectional plane of partition 114 corresponds to the radial direction of outlet port 111, meaning partition 114 directly faces outlet port 111. The portion of partition 114 near outlet port 111 bulges toward sealed end 113 to avoid outlet port 111. Specifically, the edge of partition 114 partially rises toward sealed end 113, forming a raised portion 1141. Raised portion 1141 surrounds the upper edge of outlet port 111, forming a curved flow-guiding channel. This structure fully utilizes the interior space of housing 110 and minimizes airflow disruption.

[0038] See also Figure 6The cover 119 is an integrally molded component, comprising a flat plate portion 1191, a raised ring portion 1192, and a central boss 1193. The raised ring portion 1192 is perpendicular to the inner side of the flat plate portion 1191 and has two sealing rings on its outer wall for insertion into the sealing end 113 opening of the housing 110. A central boss 1193 is located at the inner center of the flat plate portion 1191, with a blind hole 119a located at the center of the top surface of the central boss 1193.

[0039] The connecting rod 140 is configured as a cap screw, the screw rod of which passes through the threaded hole 114a of the partition 114 from the side of the air inlet port 112, and the end is inserted into and engaged with the blind hole 119a of the cover 119, and the nut is stuck on the outside of the threaded hole 114a.

[0040] That is, the connecting rod 140 has one end fixedly assembled at the center of the partition 114 and the other end inserted into the blind hole 123a of the cover 119 to prevent the cover 119 from deforming when the internal and external pressure difference is too large.

[0041] The oxygen sensor unit 100 has the following technical advantages.

[0042] 1) Stable sensor signal

[0043] The tail portion 132 of the oxygen sensor 130 is separated from the head portion by a partition 114 and is shielded from airflow. Even if an accident occurs, such as water flowing back through the mouthpiece valve into the oxygen sensing unit 100 due to an unskilled diver, the oxygen sensor 130 will not be disturbed or damaged.

[0044] 2) Compact internal structure, less interference with airflow

[0045] The partition 114 faces the air outlet port 111 and partially protrudes toward the sealing end 113 to avoid the air outlet port 111 . The protrusion 1141 surrounds the upper edge of the air outlet port 111 to form a curved guide channel.

[0046] 3) The center of the cover 119 is supported by the connecting rod 140 to prevent the cover 119 from being deformed.

[0047] In another similar embodiment, the partition 114 is a whole circular plate and is located above the gas outlet port.

[0048] In another similar embodiment, a connecting tube is used to equivalently replace the above-mentioned connecting rod 140, and the cover is provided with a central through hole with a step to equivalently replace the above-mentioned blind hole 123a and cable through hole 110b. One end of the connecting tube is stuck on the step of the central through hole of the cover, and a wire hole is provided on the side wall of the connecting tube. The wires of the sensor: enter the connecting tube from the wire hole and lead out of the compartment 110a from the central through hole of the cover.

[0049] In other embodiments, the main body of the shell is in the shape of a ground flat prism, the air outlet and air inlet of the shell are in the shape of protruding or recessed circular rings, and the cover is hinged to the shell.

[0050] The above embodiments, application examples, and technical analysis are intended to introduce the technical concepts and features of this utility model and enable those skilled in the art to implement the technical solutions of this utility model. They do not constitute any limitation on the scope of protection of this utility model. Simple modifications and equivalent conversions of the above embodiments are within the scope of protection of this utility model.

Claims

1. An oxygen sensing unit (100) for monitoring the oxygen partial pressure of a circulating gas circuit of a diving breathing apparatus, the circulating gas circuit comprising an inhalation buffer bag (200) and an inhalation pipe (300), the inhalation buffer bag being provided with an outlet end seat (210), the oxygen sensing unit comprising a housing (110) and three oxygen sensors (130); The housing (110) is provided with an air outlet port for installing the air intake pipe, an air inlet port for assembling on the air outlet end seat, and a sealing end sealed by a sealing cover; It is characterized by: The shell is integrally provided with a partition (114) inside, and a compartment (110a) is formed at the sealed end, wherein the compartment is provided with a cable through hole (110b); The oxygen sensor has a main body located in the compartment, a head portion of the sensor is embedded in the mounting through hole of the partition and exposed to the airflow, and a wire at the tail portion is led out from the cable through hole.

2. The oxygen sensor unit according to claim 1, characterized in that The shell body is cylindrical, the side wall is provided with the air outlet port, one end in the direction of the central axis is provided as the air inlet port, and the other end in the direction of the central axis is provided as the sealing end; The partition is perpendicular to the central axis of the shell and faces the gas outlet port. A portion close to the gas outlet port protrudes toward the sealing end to avoid the gas outlet port.

3. The oxygen sensor unit according to claim 2, characterized in that It also includes a connecting rod (140), one end of which is fixedly assembled at the center of the partition; A central boss is provided at the center of the inner side surface of the cover, and a blind hole is provided at the center of the top surface of the central boss to insert the other end of the connecting rod.

4. The oxygen sensor unit according to claim 3, characterized in that A threaded through hole (114a) is provided at the center of the partition; The connecting rod is configured as a cap screw, and the screw rod penetrates the compartment from the threaded through hole and engages in the blind hole of the cover.

5. The oxygen sensor unit according to claim 1, characterized in that An inner wall edge of the compartment corresponding to the cable through hole is provided as an inner wall boss (117) for assembling a cable connector (150); The oxygen sensor unit further comprises a surrounding plate (116), which is integrally and vertically arranged on the partition plate and surrounds the inner wall boss to form a redundant cable sandwich.

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