An aerobic air supply device for confined spaces

Abstract

The utility model provides an aerobic air supply device for limited space relates to monitoring technical field. The air supply device, include: air supply machine, thermal relay, leakage protector, AC contactor, alarm, battery and contact switch. Thermal relay, AC contactor and leakage protector are sequentially arranged between air supply machine and power. The alarm and the auxiliary contact of AC contactor are in series. The battery is connected with the alarm. The contact switch is installed between the alarm and the battery, and the contact switch is interlocked with the AC contactor. The power end of AC contactor attracts air supply machine normal work, and the auxiliary contact of AC contactor is disconnected, and the alarm stops working. When the air supply machine is powered off, the auxiliary contact of AC contactor is connected with the alarm and starts working. The utility model solves the complex construction environment through the air supply device, after the shutdown of air supply machine, cannot be discovered in time, causes the bottleneck of the operating personnel hypoxia, ensures the safety of the operating personnel in limited space.

Description

Technical Field

[0001] This utility model relates to the field of monitoring technology, and in particular to an oxygen supply device for confined spaces. Background Technology

[0002] During polysilicon production, maintenance of production equipment is required. This often involves working in confined spaces, which are complex environments with numerous hazards, making them highly susceptible to accidents. Maintaining good ventilation and a stable oxygen-rich environment within these confined spaces is a crucial safety control measure for ensuring the safety and health of workers.

[0003] Confined spaces are typically characterized by their narrowness, poor ventilation, and the potential presence of toxic or harmful gases or flammable and explosive materials. When working in such spaces, an unstable ventilation system can lead to insufficient oxygen levels and the accumulation of harmful gases, posing a serious health threat and even endangering the lives of workers. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an oxygen supply device for confined spaces. This device solves the bottleneck of oxygen deficiency for workers caused by the inability to detect the shutdown of the ventilation fan in a timely manner when the construction environment is complex, thus ensuring the safety of workers in confined spaces.

[0005] The technical solution adopted in this utility model is:

[0006] An oxygen supply ventilation device for confined spaces, comprising:

[0007] The blower is equipped with a thermal relay, an AC contactor, and a leakage current protector between the blower and the power source.

[0008] An alarm is connected in series with the auxiliary contacts of the AC contactor;

[0009] A storage battery is connected to the alarm.

[0010] A contact switch is installed on the power line between the alarm and the battery, and the contact switch is connected in series with the auxiliary contacts of the AC contactor.

[0011] When the blower is working normally, the power supply terminal of the AC contactor is engaged, the auxiliary contact of the AC contactor is disengaged, and the alarm stops working.

[0012] When the blower is de-energized, the power supply terminal of the AC contactor is disconnected from the external power supply, the auxiliary contacts of the AC contactor are connected, and the alarm starts to work.

[0013] Optionally, the oxygen supply air device further includes:

[0014] The explosion-proof enclosure houses the thermal relay, AC contactor, leakage current protector, battery, and contact switch.

[0015] An alarm is installed on top of the explosion-proof box.

[0016] Optionally, the oxygen supply air device further includes:

[0017] A backup power supply is provided, which is connected to the alarm.

[0018] Optionally, the explosion-proof box includes:

[0019] The base is fixedly installed on the ground within the factory area;

[0020] Mounting bracket, installed on top of the base;

[0021] A grounding lead is installed on the base;

[0022] An explosion-proof enclosure is installed on top of the mounting bracket. The bottom of the explosion-proof enclosure is equipped with an explosion-proof gland for connecting wires to enter and exit. The side wall of the explosion-proof enclosure is equipped with an operating switch for a leakage current protector, a control switch for an AC contactor, and a contact switch.

[0023] Optionally, the control switch of the AC contactor is a rotary switch that requires a key to start and stop.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] This ventilation device solves the bottleneck of oxygen deficiency for workers in complex construction environments where the ventilation fan may not be detected in time after shutdown, thus ensuring the safety of workers in confined spaces. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the left-hand structure of an oxygen supply system for confined spaces.

[0028] Figure 2 This is a schematic diagram of the main structure of an oxygen supply system for confined spaces.

[0029] Figure 3 This is a schematic diagram of the control circuit structure of an aerobic ventilation device used in confined spaces.

[0030] Figure label:

[0031] 1. Residual current device (RCD);

[0032] 2. AC contactor;

[0033] 3. Alarm device;

[0034] 4. Storage battery;

[0035] 5. Contact switch;

[0036] 6. Explosion-proof enclosure; 61. Base; 62. Mounting bracket; 63. Grounding lead; 64. Explosion-proof enclosure body;

[0037] 7. Backup power supply;

[0038] 8. Blower;

[0039] 9. Explosion-proof gland. Detailed Implementation

[0040] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0041] In the description of this utility model, it should be understood that the terms "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0045] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0046] This utility model provides an oxygen supply ventilation device for confined spaces, comprising: a blower 8, a thermal relay, a leakage current protector 1, an AC contactor 2, an alarm 3, a storage battery 4, and a contact switch 5. The thermal relay, AC contactor 2, and leakage current protector 1 are sequentially installed between the blower 8 and the power source. The alarm 3 is connected in series with the auxiliary contact of the AC contactor 2. The storage battery 4 is connected to the alarm 3. The contact switch 5 is installed on the power line between the alarm 3 and the storage battery 4, and is also connected in series with the auxiliary contact of the AC contactor 2. When the blower 8 is operating normally, the power terminal of the AC contactor 2 is engaged, the auxiliary contact of the AC contactor 2 is disengaged, and the alarm 3 stops working. When the blower 8 is de-energized, the power terminal of the AC contactor 2 is disconnected from the external power source, the auxiliary contact of the AC contactor 2 is engaged, and the alarm 3 starts working.

[0047] Before workers enter the confined space, the safety supervisor must start the ventilation fan 8 in advance. After the safety supervisor starts the ventilation fan 8, no other personnel have the authority to stop the ventilation fan 8. The alarm 3 is connected in series with the normally closed auxiliary contact of the AC contactor 2, and the alarm 3 is powered by the storage battery 4.

[0048] When activated, contact switch 5 closes, allowing battery 4 to power alarm 3. If contact switch 5 is normally open, blower 8 cannot be started.

[0049] When the blower 8 is working normally, the AC contactor 2 is engaged, and the alarm 3, which is connected in series with the auxiliary contact of the AC contactor 2, is disconnected, and the alarm 3 is in a de-energized state.

[0050] When the power supply to the blower 8 is interrupted or malfunctions cause the leakage current protection device 1 to trip, the AC contactor 2 will simultaneously lose power. At this time, the auxiliary contact of the AC contactor 2 connected in series with the alarm 3 will change from normally open to normally closed, and the alarm 3 will activate. This will alert the monitoring personnel to immediately take emergency oxygen supply measures or evacuate the workers in the confined space to ensure their safety.

[0051] In one embodiment, the aerobic air supply device further includes an explosion-proof enclosure 6. A thermal relay, an AC contactor 2, a residual current device 1, a battery 4, and a contact switch 5 are all installed inside the explosion-proof enclosure 6. An alarm 3 is installed on the top of the explosion-proof enclosure 6.

[0052] To improve the safety of the device, the thermal relay, AC contactor 2, leakage current protector 1, storage battery 4 and contact switch 5 are all installed in the explosion-proof box 6.

[0053] In one embodiment, the oxygen supply device further includes a backup power supply 7, which is connected to an alarm 3.

[0054] To prevent the alarm 3 from malfunctioning due to insufficient power in the battery 4 during use, a backup power supply 7 is installed inside the explosion-proof box 6 to power the alarm 3.

[0055] In one embodiment, the explosion-proof enclosure 6 includes: a base 61, a mounting bracket 62, a grounding lead 63, and an explosion-proof enclosure body 6. The base 61 is fixedly installed on the ground within the factory area. A grounding lead 63 is installed on the top of the base 61. The explosion-proof enclosure body 6 is installed on the top of the mounting bracket 62. The bottom of the explosion-proof enclosure body 6 is provided with an explosion-proof gland 9 for connecting wires to enter and exit. The side wall of the explosion-proof enclosure body 6 is provided with an operating switch for a residual current device 1, a control switch for an AC contactor 2, and a contact switch 5.

[0056] The base 61 is fixedly installed on the ground in the factory area. For easy grounding, a grounding lead 63 is installed on the base 61. To prevent the thermal relay, residual current device 1, AC contactor 2, battery 4, and contact switch 5 from contacting the ground and becoming damp, an explosion-proof enclosure 6 housing the power module, residual current device 1, AC contactor 2, battery 4, and contact switch 5 is installed on a mounting bracket 62 connected to the base 61. An explosion-proof gland 9 is installed at the bottom of the enclosure to facilitate the exit of power cords and connecting wires.

[0057] In one embodiment, the control switch for the AC contactor 2 is a rotary switch that requires a key to start and stop. To prevent anyone other than a safety supervisor from starting or stopping the blower 8, the safety supervisor controls the blower 8 to start and stop via a key.

[0058] Before workers enter the confined space, the safety supervisor must start the blower 8 with a key. After starting, the key must be removed and kept safe by the safety supervisor. Other personnel are not allowed to stop the blower 8.

[0059] In one embodiment, alarm 3 is an audible and visual alarm. When an alarm is triggered, it alerts personnel simultaneously through both sound and light.

[0060] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An oxygen supply ventilation device for confined spaces, characterized in that, include: The blower is equipped with a thermal relay, an AC contactor, and a leakage current protector between the blower and the power source. An alarm is connected in series with the auxiliary contacts of the AC contactor; A storage battery is connected to the alarm. A contact switch is installed on the power line between the alarm and the battery, and the contact switch is connected in series with the auxiliary contacts of the AC contactor. When the blower is working normally, the power supply terminal of the AC contactor is engaged, the auxiliary contact of the AC contactor is disengaged, and the alarm stops working. When the blower is de-energized, the power supply terminal of the AC contactor is disconnected from the external power supply, the auxiliary contacts of the AC contactor are connected, and the alarm starts to work.

2. The oxygen supply ventilation device for confined spaces according to claim 1, characterized in that, The oxygen supply device further includes: The explosion-proof enclosure houses the thermal relay, AC contactor, leakage current protector, battery, and contact switch. An alarm is installed on top of the explosion-proof box.

3. The oxygen supply ventilation device for confined spaces according to claim 1 or 2, characterized in that, The oxygen supply device further includes: A backup power supply is provided, which is connected to the alarm.

4. The oxygen supply ventilation device for confined spaces according to claim 2, characterized in that, The explosion-proof box includes: The base is fixedly installed on the ground within the factory area; Mounting bracket, installed on top of the base; A grounding lead is installed on the base; An explosion-proof enclosure is installed on top of the mounting bracket. The bottom of the explosion-proof enclosure is equipped with an explosion-proof gland for connecting wires to enter and exit. The side wall of the explosion-proof enclosure is equipped with an operating switch for a leakage current protector, a control switch for an AC contactor, and a contact switch.

5. The oxygen supply ventilation device for confined spaces according to claim 4, characterized in that, The control switch of the AC contactor is a rotary switch that requires a key to start and stop.

6. The oxygen supply ventilation device for confined spaces according to claim 1, characterized in that, The alarm is an audible and visual alarm.

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