CN217015110U - Respirator capable of monitoring and indicating service life of filter element - Google Patents

Abstract

A respirator that can monitor and indicate the useful life of a filter element, comprising: a mask body, a headband, and at least one filter cartridge that monitors and indicates the useful life of a filter element, the filter cartridge comprising a filter cartridge base, a monitoring and indicating moduleA filter element and a filter box cover. Wherein, the monitoring and indicating module can monitor the air pressure, VOC and Cl in real time₂、H₂S、SO₂、HCl、NH₃And the concentration of one or more gases in NO, and light and vibration alarm is carried out when relevant parameters exceed set thresholds, so that the filter element is indicated to reach the service life, and a user is reminded to replace the new filter element in time. In the respirator, the monitoring and indicating module is arranged on the filter cartridge base and can be repeatedly used together with the filter cartridge base, and a user only needs to replace the filter element with the expired service life, so that the service life of the filter element can be indicated in real time, and the use cost of protective articles can be reduced.

Description

Respirator that monitors and indicates filter element life

technical field

The utility model relates to a respirator, in particular to a respirator which can monitor and indicate the service life of filter elements.

Background technique

Many work environments can expose workers to polluted air. In appropriate work environments, workers can use respirators (respiratory protective equipment) to help reduce exposure risks. Usually, the user cannot know the current performance and status of the respirator. If the expired filter cartridge is not replaced in time, it may cause harm to the body due to long-term inhalation of toxic and harmful gases/vapors exceeding the limit value. For users who use anti-particulate filter cotton/dust filter box, if the filter cotton/dust filter box with excessive resistance is not replaced in time, it may also cause excessive fatigue or suffer cardiopulmonary function damage due to wearing a respirator with overloaded resistance for a long time. Therefore, timely replacement of respirator cartridges and cotton/dust cartridges is very important for the safety and health of workers.

It is also critical for employers to formulate a reasonable replacement plan for respirator cartridges. Typically, prior to planning for respirator cartridge replacement, sampling and analysis of potential toxic and noxious gas or vapor contaminants in the workplace is required to determine the average airborne concentration level. After the contaminants and their concentrations are identified, the cartridge replacement cycle is determined based on the respirator manufacturer's service life estimation software. However, the actual level of pollutants in the workplace is not constant, the actual exposure time is difficult to determine, and the performance of the cartridge is also affected by environmental conditions such as temperature and humidity. The filter cartridge replacement cycle estimated by experience or software is difficult to truly and effectively reflect the life of the filter cartridge, and it is also difficult to ensure that the filter cartridge is replaced when its life is reached.

Therefore, in order to monitor the service life of the filter cartridge and remind users to replace the filter cartridge in time, it is very important to introduce an End-of-Service-Life Indicator (ESLI) on the respirator. ESLI is divided into two categories: passive and active. A typical passive ESLI is a colorimetric failure indicator. It is to coat the chemical indicator on the test paper or film, and then place it on the inside of the transparent window on the side wall of the filter box; when the adsorption layer of the filter box is close to saturation or penetrated by pollutants, the chemical indicator reacts with the pollutants The color of the test paper or film is obviously changed, and the user can replace the filter cartridge in time after observing through the transparent window. The operability of passive ESLI is poor: 1) It is difficult to observe in a dark workplace; 2) It requires the user to observe at any time, and it is often impossible to directly observe from the user's perspective, thus interfering with the user's concentration and work efficiency ; 3) There are very few available types, which can only meet the needs of some workplaces.

Active ESLI uses sensors to monitor the presence of contaminants, prompting the user to replace the cartridge when the adsorption layer of the cartridge is nearly saturated or penetrated by contaminants. Active ESLI is usually divided into 3 categories: 1) The sensor and warning device are installed in the full-face respirator mask, which has the disadvantage of occupying the user's breathing space and cannot be used for half-face respirator; 2) The sensor is built in In the filter box, external monitoring and warning devices will affect wearing and operation; 3) The sensors and warning devices are built into the filter box, usually used in emergency response occasions, one-time use, high cost, not suitable for industrial site application.

Where the risk of exposure to particulate matter needs to be reduced, respirators require the use of particulate filter cotton or dust filter boxes. However, as the use time of the filter cotton/dust filter box increases, the accumulation of particulate matter will greatly increase the resistance of the filter cotton/dust filter box, thereby increasing the difficulty of inhalation for the user. In fact, employers often do not have clear filter cotton replacement conditions and replacement plans. They only determine whether the filter cotton needs to be replaced by the user's feelings, or force the replacement cycle. The consequences may be wasteful due to frequent filter replacement. Or if the filter cotton/dust box is not replaced for a long time, it will overload the user or cause damage to their cardiopulmonary function.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a respirator including a monitoring and indication module (an active ESLI). The monitoring and indicating module can monitor the concentration of one or more gases in VOC, Cl ₂ , H ₂ S, SO ₂ , HCl, NH ₃ and NO at the back end of the filter element in real time, and can also monitor the air pressure at the back end of the filter element in real time , which can not only indicate the service life of the anti-virus filter element, but also indicate the service life of the anti-particulate filter cotton or dust filter box according to the air pressure difference at the rear end of the filter element during breathing. In the respirator of the present invention, the monitoring and indicating module is placed on the filter box base, which can be reused together with the filter box base. The user only needs to replace the filter element whose service life has expired, and not only can indicate the filter element in real time. The service life can also help reduce the cost of using protective equipment.

The utility model discloses a respirator capable of monitoring and indicating the service life of a filter element, comprising: a mask body, a headband and at least one filter box capable of monitoring and indicating the service life of the filter element; the mask body is a self-priming filter The filter box includes a filter box base, a monitoring and indication module, a filter element and a filter box cover.

The mask body can be a half-face mask body or a full-face mask body.

In the filter box base, one side is the interface connecting the mask body, and the other side is the cavity for installing the monitoring and indicating module and filter element and connecting the filter box cover.

In the monitoring and indication module, the air pressure sensor can monitor the air pressure filtered by the filter element in real time, so as to monitor the resistance of the filter element during breathing and calculate the wearing time of the respirator.

The monitoring and indicating module, wherein the gas sensor is one or both of solid-state electrolyte electrochemical sensor and low-power MEMS metal-oxide-semiconductor sensor, can monitor the VOC, Cl ₂ filtered by the filter element in real time , H ₂ S, SO ₂ , HCl, NH ₃ and NO in the concentration of one or more toxic gases.

In the monitoring and indicating module, the micro-touch switch or the membrane pressure sensor can sense whether the filter box is installed with a filter element.

The monitoring and indicating module, wherein the wireless transmission module, can transmit parameters such as filtered toxic gas concentration, filter element resistance, respirator wearing time and filter element cumulative use time to the corresponding terminal or monitoring platform.

In the monitoring and indicating module, the indicator includes one or both of LED and micro vibration motor, which can provide light and vibration alarm signals, and can also indicate the working state and remaining power.

The filter element may be an anti-particulate or anti-virus filter element, or a combination of an anti-particulate and anti-virus filter element.

The filter box cover can be an independent fixing fastener or a fixing fastener integrated on the filter element.

Description of drawings

Fig. 1 is the structural schematic diagram of the respirator of the present invention.

Figure 2 is a schematic diagram of the filter box of the respirator of the present invention.

Figure 3 is a schematic structural diagram of the filter box of the respirator of the present invention.

4 is a schematic diagram of the air pressure sensor monitoring the resistance of the filter element and calculating the wearing time in the present invention.

FIG. 5 is a schematic diagram of the gas sensor monitoring the service life failure indication of the canister in the present invention.

Detailed ways

The present utility model will be further described below with reference to the accompanying drawings and specific embodiments.

A respirator capable of monitoring and indicating the service life of the filter element (as shown in Figure 1), comprising: a mask body, a headgear, and at least one filter cartridge capable of monitoring and indicating the service life of the filter element.

The mask body of the respirator is a self-priming filter type airtight respirator mask body, which can be either a half-face mask body or a full-face mask body.

Figure 2 is a schematic diagram of the filter box of the respirator of the present invention. One end of the filter box is an interface 21 for connecting to the mask body, there is an LED indicator window 22 on each side, and a sealable power and data transmission port 23 on the other side.

The filter box structure (as shown in Figure 3) described in the respirator of the present utility model is suitable for a filter box or a filter canister. The monitoring and indication module 32 is placed in the cartridge base 31 after the filter element 33 . The filter element 33 is a replaceable element prior to the monitoring and indication module 32, which is fastened by the filter box cover 34 and is placed in the filter box base 31 with a sealed perimeter. The filter element 33 may be an anti-virus filter element or an anti-particulate filter element, or a combination of an anti-virus filter element and an anti-particle filter element.

The monitoring and indicating module 32 is a circuit module with monitoring and indicating functions, including: built-in rechargeable battery, data acquisition and processing unit, power supply and data transmission port, air pressure sensor, one or more solid-state electrolyte electrochemical sensors or low Power consumption MEMS metal oxide sensors, micro-tact switches or thin-film pressure sensors, wireless transmission modules, LED indicators, micro-vibration motors, and other auxiliary components.

The air pressure sensor in the monitoring and indicating module 32 can monitor the air pressure filtered by the filter element in real time, which is used to monitor the resistance of the filter element during breathing and calculate the wearing time of the respirator. The gas sensor is one or both of solid-state electrolyte electrochemical sensors and low-power MEMS metal-oxide-semiconductor sensors, which can monitor real-time VOC, Cl ₂ , H ₂ S, SO ₂ , HCl, The concentration of one or more toxic gases in _NH3 and NO. A micro-tact switch or a membrane pressure sensor senses the presence or absence of a filter element in the filter cartridge. The wireless transmission module can transmit parameters such as the filtered toxic gas concentration, the resistance of the filter element, the wearing time of the respirator and the cumulative use time of the filter element to the corresponding terminal or monitoring platform. LED indicates that it and the micro vibration motor can provide light and vibration alarm signals, and can also indicate the working status and remaining power.

Here's how a respirator, which monitors and indicates filter element life, works:

As shown in Figure 4, before the user wears the respirator, the reading of the air pressure sensor is stable; when the user puts on the respirator and starts to inhale, the air pressure sensor detects that the air pressure at the rear of the filter element begins to change periodically. The time is recorded as the time Ts when the respirator starts to be worn. After the user takes off the respirator, the reading of the air pressure sensor tends to be stable, and this time is recorded as the time Te when the respirator stops wearing. The respirator records the actual time used this time: Te-Ts, and records the cumulative time used by the filter element.

Since the inhalation valve of the respirator is a one-way valve, when the user exhales, the inhalation valve is closed, and the air pressure at the back end of the filter element can return to the atmospheric pressure value; while the inhalation valve is opened when inhaling, due to the resistance of the filter element, There will be a pressure drop across its front and rear. The peak-to-valley difference ΔP of the air pressure sensor reading is the maximum resistance of the filter element when it is in use. When ΔP reaches or exceeds the preset resistance threshold, the user will perceive the visible light or vibration alarm signal provided by the respirator; at the same time, the respirator can also transmit relevant data and alarm signals to the corresponding terminal or monitoring platform.

The anti-virus filter within the validity period can completely remove the target gas or reduce its concentration to a very low value C0 (as shown in Figure 5) to protect the health and safety of users. With the increase of use time, the capacity of the anti-virus filter element to absorb and filter toxic and harmful gases will gradually decrease. At the stage of approaching the service life of the anti-virus filter element, the concentration of toxic and harmful gases penetrating the anti-virus filter element will increase significantly. When the penetration concentration is greater than or equal to the preset concentration threshold Ca, the user will perceive the visible light or vibration alarm signal provided by the respirator; at the same time, the respirator can also transmit relevant data and alarm signals including the service life of the anti-virus filter element Ta. to the corresponding terminal or monitoring platform.

In the absence of a wireless terminal or platform, managers or respirator users can export relevant data through the filter box's power and data transmission port 23 for recording and analysis.

The above-mentioned embodiments are only the preferred technical solutions of the present invention, and should not be regarded as limitations of the present invention. The embodiments in the present application and the features therein may be arbitrarily combined with each other without conflict. The protection scope of the present utility model shall include the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims, and the equivalent replacement improvements within this scope, which are also within the protection scope of the present utility model.

Claims (9)

1. A respirator that can monitor and indicate the service life of the filter element, including a self-priming filter type airtight respirator mask body, a headband and at least one filter box that can monitor and indicate the service life of the filter element, characterized in that: the The filter cartridge includes a filter cartridge base, monitoring and indication module, filter element and filter cartridge cover. 2 . The respirator capable of monitoring and indicating the service life of filter elements according to claim 1 , wherein the respirator mask body can be a half-face mask body or a full-face mask body. 3 . 3. The respirator capable of monitoring and indicating the service life of the filter element according to claim 1, characterized in that: one side of the filter box base is the interface connecting the mask body, and the other side is the installation monitoring and indicating module and filter element and connect to the cavity of the filter box cover. 4. The respirator capable of monitoring and indicating the service life of the filter element according to claim 1, wherein the monitoring and indicating module comprises an air pressure sensor, which can monitor the air pressure at the rear end of the filter element in real time, and is used to calculate the filter element. Element resistance and respirator wear time. 5. The respirator capable of monitoring and indicating the service life of the filter element according to claim 1, wherein the monitoring and indicating module at least comprises a solid-state electrolyte electrochemical sensor and a low-power MEMS metal-oxide-semiconductor sensor One of the gas sensors in the device can monitor the concentration of one or more gases in VOC, Cl ₂ , H ₂ S, SO ₂ , HCl, NH ₃ and NO filtered by the filter element in real time. 6. The respirator capable of monitoring and indicating the service life of the filter element according to claim 1, wherein the monitoring and indicating module comprises a micro-touch switch or a membrane pressure sensor, which can sense whether the filter box is installed with a filter element. 7. The respirator capable of monitoring and indicating the service life of filter elements according to claim 1, wherein the monitoring and indicating module comprises one or both of LED and micro-vibration motor, which can provide light, Vibration alarm signal can also indicate working status and remaining power. 8. The respirator capable of monitoring and indicating the service life of a filter element according to claim 1, wherein the filter element can be an anti-particulate or anti-virus filter element, or a combination of an anti-particulate and anti-virus filter element combination. 9. The respirator capable of monitoring and indicating the service life of the filter element according to claim 1, wherein the filter box cover can be an independent fixing fastener or a fixing fastener integrated on the filter element pieces.

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