A positive pressure air fed mask system for confined space operations

Abstract

The application provides a positive pressure air supply mask system for confined space operation, and relates to the technical field of chemical industry.The system comprises a mask, the inner side edge of which can be attached to the skin of a human face, and a relatively closed breathing space can be formed between the inner side of the mask and the human face; a wearing assembly is arranged on the mask and used for wearing the mask on the head of the human; a one-way exhalation valve is arranged on the mask and used for discharging the exhaled gas of the human from the breathing space; a positive pressure air supply source is arranged outside the confined space and is connected with the breathing space through an air inlet pipeline; a lighting lamp is arranged on the mask and is arranged close to the air outlet end of the air inlet pipeline; and a light filtering welding viewing mirror is arranged on the mask.The embodiment integrates the functions of breathing, welding eye protection, lighting and the like, and the positive pressure air supply source arranged outside the confined space is used for supplying air to the human in the confined space, and the human has a small risk of inhaling the residual toxic substances in the confined space.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, and in particular to a positive pressure ventilation mask system for confined space operations. Background Technology

[0002] The chemical industry uses a large number of containers for storing chemical raw materials. When abnormalities occur inside these containers, personnel often need to enter for maintenance. These containers often contain large quantities of toxic and hazardous media that have been stored for extended periods. Although they have been purged and cleaned before maintenance, small amounts of toxic substances may still remain inside.

[0003] The limited operational space inside a container presents the following challenges for personnel entering this confined space to perform tasks (such as welding):

[0004] 1. It is necessary to carry a large number of independent tools and equipment, such as air respirators, welding masks, and explosion-proof flashlights.

[0005] 2. When personnel are performing welding operations in the confined space inside the container, they must frequently switch between wearing an air respirator (to ensure breathing) and a welding mask (to deal with the instantaneous welding arc light generated during the welding process). This results in complicated switching operations during actual construction, serious reduction in construction efficiency, and a risk of personnel injury. Utility Model Content

[0006] In view of the above situation, the present invention provides a positive pressure ventilation mask system for confined space operations, which aims to solve at least one of the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] This utility model provides a positive pressure ventilation mask system for confined space operations, comprising:

[0009] The mask has an inner edge that can fit snugly against the skin of a person's face, and a relatively sealed breathing space can be formed between the inner side of the mask and the person's face.

[0010] A wearing component, disposed on the mask, for wearing the mask on a person's head;

[0011] A one-way exhalation valve is provided on the mask to expel the person's exhaled air from the breathing space;

[0012] A positive pressure air supply source is located outside the confined space and is connected to the breathing space through an air intake pipe;

[0013] A light is mounted on the face mask and positioned near the air outlet of the air inlet pipe;

[0014] A filter welding sight glass is mounted on the mask.

[0015] In some embodiments of this utility model, the wearing component includes:

[0016] The rear strap is connected to the upper part of the mask at one end and is free at the other end.

[0017] The side strap is connected at one end to the side edge of the face mask and at the other end to the rear strap in a detachable manner.

[0018] In some embodiments of this invention, a plurality of the lateral straps are spaced apart along the length of the face mask.

[0019] In some embodiments of this utility model, the tension between the lateral strap and the rear strap is adjustable.

[0020] In some embodiments of this utility model, the air intake pipe is made of rubber.

[0021] In some embodiments of this utility model, the lighting lamp is magnetically attached to the face mask.

[0022] In some embodiments of this invention, a welding brightness sensor associated with the filter welding sight glass is also included.

[0023] In some embodiments of this utility model, a warning component is also included to issue a warning to personnel when the positive pressure air supply source or lighting fails.

[0024] In some embodiments of this invention, the warning component includes a brightness sensor and a warning light; the brightness sensor is disposed on the upper outer side of the face mask; the state of the warning light is associated with the data detected by the brightness sensor.

[0025] In some embodiments of this invention, the warning component further includes a flow sensor; the flow sensor is used to measure the flow rate at the outlet end of the air intake pipe; the state of the warning light is associated with the data detected by the flow sensor.

[0026] The embodiments of this utility model have at least the following advantages or beneficial effects:

[0027] 1. This embodiment uses a positive pressure air supply source located outside the confined space to supply air to personnel inside the confined space, thus minimizing the risk of personnel inhaling residual toxic substances within the confined space.

[0028] Second, this embodiment has both breathing and welding eye protection functions, and does not require frequent removal and wearing.

[0029] Third, this embodiment integrates functions such as breathing, welding eye protection, and lighting, so personnel no longer need to carry a large number of separate tools.

[0030] Fourth, the lighting fixture is placed near the outlet end of the air intake pipe. This way, some of the heat generated by the lighting fixture can be carried away by the airflow, thus avoiding the problem of explosion caused by the lighting fixture overheating during prolonged operation.

[0031] Other features and advantages of this invention will be set forth in the following description. Attached Figure Description

[0032] 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 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.

[0033] Figure 1 This is a schematic diagram of the structure of Example 1;

[0034] Figure 2 for Figure 1 Right view of the middle face mask;

[0035] Figure 3 This is a schematic diagram of the welding brightness sensor in Example 2 and the warning component in Example 3.

[0036] Icons: 1-face mask, 2-wearing components, 21-rear strap, 22-side strap, 3-one-way exhalation valve, 4-positive pressure air supply source, 5-lighting light, 6-filter welding sight glass, 7-breathing space, 8-intake line, 9-welding brightness sensor, 10-lighting brightness sensor, 11-warning light. Detailed Implementation

[0037] 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 the present invention.

[0038] In the description of the embodiments of this utility model, it should be understood that the terms "length", "upper", "lower", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying 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 the embodiments of this utility model.

[0039] Furthermore, the term "multiple" means two or more, unless otherwise explicitly specified.

[0040] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" 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 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 embodiment of the invention according to the specific circumstances.

[0041] The embodiments of this utility model will be described in detail below.

[0042] Example 1

[0043] See Figure 1 This embodiment provides a positive pressure ventilation mask system for confined space operations, including: mask 1, wearing component 2, one-way exhalation valve 3, positive pressure air supply source 4, lighting lamp 5, and filter welding sight glass 6.

[0044] The inner edge of the mask 1 can fit snugly against the skin of a person's face, forming a relatively sealed breathing space 7 between the inner side of the mask 1 and the person's face. The inner side of the mask 1 refers to the side facing the person's face.

[0045] Wearing component 2 is disposed on mask 1 for wearing mask 1 on a person's head.

[0046] A one-way exhalation valve 3 is installed on the mask 1 to expel the exhaled air from the breathing space 7.

[0047] The positive pressure air supply source 4 is located outside the confined space and is connected to the lower part of the mask 1 via the air intake pipe 8, and can communicate with the breathing space 7. The positive pressure air supply source 4 is, for example, a fan, used to deliver air into the breathing space 7 through the air intake pipe 8.

[0048] An illumination lamp 5 is mounted on the face mask 1 to provide illumination in a confined space. The illumination lamp 5 is positioned near the outlet end of the air intake duct 8.

[0049] The filter welding sight glass 6 is mounted on the mask 1 and is positioned to correspond to the human eye.

[0050] Before entering the confined space, personnel wear face mask 1 on their face using wearing component 2, ensuring the inner edge of face mask 1 fits snugly against the skin to guarantee a good seal. Positive pressure air supply source 4 is activated, continuously supplying outside air into the breathing space 7 through intake pipe 8 to ensure oxygen supply for the workers. When exhaling normally, the exhaled air is expelled through one-way exhalation valve 3. During welding operations in the confined space, personnel use lighting 5 for illumination and a filter welding sight glass 6 for observation.

[0051] Understandably, the air intake pipe 8 should be able to move freely, and it can be made of materials such as rubber or silicone. The lighting lamp 5 should have an integrated power supply (equivalent to a small flashlight).

[0052] In this embodiment, the wearing component 2 includes a rear strap 21 and a side strap 22.

[0053] One end of the rear strap 21 is connected to the upper part of the mask 1, and the other end is a free end.

[0054] One end of the side strap 22 is connected to the side edge of the mask 1, and the other end is detachably connected to the rear strap 21 (using Velcro, buckles, etc.). Multiple side straps 22 extend along the length of the mask 1. Figure 1 The interval settings are shown in the vertical direction.

[0055] When using the wearing component 2, align the mask 1 with your face, extend the free end of the rear strap 21 toward the back of your head, and then connect the side strap 22 to the rear strap 21 to complete the wearing process.

[0056] The side straps 22 and the rear straps 21 are connected by Velcro, buckles, or other means, and are adjustable in tightness.

[0057] In summary, this embodiment has at least the following beneficial effects:

[0058] 1. In this embodiment, a positive pressure air supply source 4 is set outside the confined space to supply air to personnel in the confined space, and the risk of personnel inhaling residual toxic substances in the confined space is small.

[0059] Second, this embodiment has both breathing and welding eye protection functions, and does not require frequent removal and wearing.

[0060] Third, this embodiment integrates functions such as breathing, welding eye protection, and lighting, so personnel no longer need to carry a large number of separate tools.

[0061] Fourth, the lighting lamp 5 is placed near the air outlet of the air intake pipe 8. In this way, some of the heat generated by the lighting lamp 5 can be carried away by the airflow to avoid the lighting lamp 5 overheating after working for a long time.

[0062] Example 2

[0063] This embodiment is an improvement upon embodiment 1 or 2. In this embodiment, the filter welding sight glass 6 has a color-changing function to adapt to changes in light intensity and protect the eyes of personnel.

[0064] This embodiment also includes a welding brightness sensor 9 associated with the filter welding sight glass 6.

[0065] The welding brightness sensor 9 is mounted on the mask 1 and positioned close to the filter welding sight glass 6 to detect the ambient light brightness during welding operations.

[0066] When the light intensity sensed by the welding brightness sensor 9 is greater than or equal to the preset threshold, the filter welding sight glass 6 changes from transparent to dark black to avoid damage to the welder's eyes caused by strong light; when the light intensity sensed by the welding brightness sensor 9 is lower than the preset threshold, the sight glass becomes transparent.

[0067] The aforementioned color-changing scheme is characterized by its high responsiveness. In other embodiments, the color-changing function of the filter welding sight glass 6 can also be achieved without relying on the welding brightness sensor 9 (as it possesses its own photosensitive color-changing characteristics).

[0068] Example 3

[0069] The difference between this embodiment and embodiment 1 is that the lighting lamp 5 is installed on the mask 1 by magnetic attraction. Specifically, the base of the lighting lamp 5 is connected to a magnet, and an iron plate is provided on the mask 1. The lighting lamp 5 is installed on the mask 1 by the cooperation of the magnet and the iron plate.

[0070] The lighting lamp 5 is covered with a transparent thermally conductive silicone sleeve (not shown in the figure; the lampshade and lamp holder are both located inside the transparent thermally conductive silicone sleeve). The transparent thermally conductive silicone sleeve can transfer heat to the breathing space 7, and the heat is carried away by airflow, thus realizing the explosion-proof function of the lighting lamp 5.

[0071] This embodiment also includes a warning component, which is mounted on the face mask 1, to warn personnel in the event of a malfunction of the positive pressure air supply source 4 or the lighting 5. The warning component includes a lighting brightness sensor 10, a flow sensor (not shown in the figure), and a warning light 11.

[0072] The illumination brightness sensor 10 is located on the upper outer side of the mask 1.

[0073] The flow sensor is used to measure the flow rate at the outlet end of the intake pipe 8.

[0074] The status of the warning light 11 is associated with the data detected by the illumination brightness sensor 10 and the flow sensor.

[0075] When the positive pressure air supply source 4 or the lighting 5 malfunctions, the flow sensor and the lighting brightness sensor 10 detect abnormal data, and the warning light 11 illuminates or flashes to alert personnel so that they can evacuate the confined space in time.

[0076] Example 4

[0077] In this embodiment, in order to adapt to usage scenarios with large temperature differences between the inside and outside of the mask, an annular elastic pad (not shown in the figure) made of skin-friendly silicone is attached to the inside of the mask 1. The annular elastic pad is used to contact the eye sockets and bridge of the nose, separating the breathing space 7 between the inside of the mask 1 and the face, thus isolating the eyes from the mouth and nose. At the same time, the size of the filter welding lens 6 is adjusted so that the filter welding lens 6 is located within the annular contour of the annular elastic pad. In this way, the exhaled air will not directly contact the filter welding lens 6, and the filter welding lens 6 is less likely to fog up when there is a large temperature difference between the inside and outside of the mask.

[0078] Example 5

[0079] In this embodiment, in order to adapt to the usage scenario where there is a large temperature difference between the inside and outside of the mask, the outer cover of the filter welding sight glass 6 is provided with a transparent protective cover made of glass (not shown in the figure). A gap is left between the inner side of the transparent protective cover and the outer side of the filter welding sight glass 6. The gap has air holes, through which air heated by external equipment can be introduced to raise the temperature of the transparent protective cover and the filter welding sight glass 6 and prevent fogging.

[0080] Example 6

[0081] In this embodiment, in order to adapt to the usage scenario where there is a large temperature difference between the inside and outside of the mask, heating wires (not shown in the figure) are arranged at the edge of the filter welding sight glass 6 and other positions. Battery, switch and other supporting equipment for the heating wires are arranged on the outside of the mask 1, so as to raise the temperature of the transparent cover and the filter welding sight glass 6 through the heating wires and avoid fogging.

[0082] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A positive pressure ventilation mask system for confined space operations, characterized in that, include: The mask has an inner edge that can fit snugly against the skin of a person's face, and a relatively sealed breathing space can be formed between the inner side of the mask and the person's face. A wearing component, disposed on the mask, for wearing the mask on a person's head; A one-way exhalation valve is provided on the mask to expel the person's exhaled air from the breathing space; A positive pressure air supply source is located outside the confined space and is connected to the breathing space through an air intake pipe; A light is mounted on the face mask and positioned near the air outlet of the air inlet pipe; A filter welding sight glass is mounted on the mask.

2. The positive pressure ventilation mask system for confined space operations according to claim 1, characterized in that, The wearable component includes: The rear strap is connected to the upper part of the mask at one end and is free at the other end. The side strap is connected at one end to the side edge of the face mask and at the other end to the rear strap in a detachable manner.

3. The positive pressure ventilation mask system for confined space operations according to claim 2, characterized in that, The lateral straps are spaced apart along the length of the face mask.

4. The positive pressure ventilation mask system for confined space operations according to claim 2, characterized in that, The tightness of the lateral straps and the rear straps is adjustable.

5. The positive pressure ventilation mask system for confined space operations according to claim 1, characterized in that, The intake pipe is made of rubber.

6. The positive pressure ventilation mask system for confined space operations according to claim 1, characterized in that, The lighting lamp is magnetically attached to the face mask.

7. The positive pressure ventilation mask system for confined space operations according to claim 1, characterized in that, It also includes a welding brightness sensor associated with the filter welding sight glass.

8. The positive pressure ventilation mask system for confined space operations according to any one of claims 1 to 7, characterized in that, It also includes a warning component for alerting personnel in the event of a malfunction in the positive pressure air supply or lighting.

9. The positive pressure ventilation mask system for confined space operations according to claim 8, characterized in that, The warning assembly includes a brightness sensor and a warning light; the brightness sensor is located on the upper outer side of the face mask; the state of the warning light is associated with the data detected by the brightness sensor.

10. The positive pressure ventilation mask system for confined space operations according to claim 9, characterized in that, The warning component also includes a flow sensor; the flow sensor is used to measure the flow rate at the outlet of the air intake pipe; the status of the warning light is associated with the data detected by the flow sensor.

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