CN112577152A - Air sterilization and disinfection device and air sterilization and disinfection method - Google Patents

Abstract

The application provides an air sterilization and disinfection device and an air sterilization and disinfection method, wherein the device comprises a body, a concentration detection sensor, a release mechanism and a controller; wherein, the body is provided with an air inlet and an air outlet; the concentration detection sensor is arranged in the body; the releasing mechanism is arranged between the air inlet and the air outlet, and is provided with a releasing hole for releasing the sterilizing gas; the controller controls the release mechanism to change the opening of the release hole according to the concentration signal. This application can detect the concentration of disinfecting gaseous such as chlorine dioxide in the air through concentration detection sensor to feed back to the controller, the controller can be according to the action of the concentration control release mechanism of disinfecting gaseous in the air, in order to adjust the aperture size in release hole, thereby realize the control to the flow size that flows out the disinfecting gaseous of disinfecting from the release hole, and then the concentration of disinfecting gaseous in the control air, reach the sterile effect of disinfecting of preferred.

Description

Air sterilization and disinfection device and air sterilization and disinfection method

Technical Field

The application relates to the technical field of air purification, in particular to an air sterilization and disinfection device and an air sterilization and disinfection method.

Background

Air purifier's on the market filter core at present uses active carbon as the main material more, utilizes its adsorption characteristic to filter the air, and this type of air purifier's filter core is mostly the effect of filtered air, getting rid of harmful gas, does not possess the sterile effect of disinfecting. Some air purification devices adopting the discharge technology are also on the market, ozone is used as a bactericide, can be released in the operation process, and can be used for sterilization and disinfection, but after the air purification devices are used for a period of time, dirt can be formed on a discharge filter section, the air purification devices need to be cleaned, and the cleaning possibly causes the sterilization and disinfection functions to be weakened or even become ineffective. In addition, ozone is used as a bactericide, the release concentration of ozone is not easy to control, and the accumulation of ozone also threatens health.

Disclosure of Invention

An object of the application is to provide an air sterilization and disinfection device and an air sterilization and disinfection method to solve the above-mentioned problems in the prior art, realize the sterilization and disinfection to the air, realize the control to the volume of disinfecting gaseous release simultaneously.

A first aspect of the present application provides an air sterilizer, comprising:

the air conditioner comprises a body, wherein an air inlet and an air outlet are formed in the body;

the concentration detection sensor is arranged in the body and used for detecting the concentration of the sterilization and disinfection gas in the air and sending a concentration signal;

the releasing mechanism is arranged between the air inlet and the air outlet, and is provided with a releasing hole for releasing the sterilizing and disinfecting gas;

the controller controls the release mechanism to change the opening degree of the release hole according to the concentration signal.

In one possible implementation, the release mechanism includes a motor, an outer housing, and an inner housing;

the release hole comprises a first hole and a second hole;

the fixed part of the motor is fixedly connected with the body, and the driving part of the motor is fixedly connected with the outer shell;

the inner shell is fixedly arranged in the body, and the outer shell is rotatably sleeved on the inner shell;

the first hole is arranged on the inner shell, the second hole is arranged on the outer shell, and the second hole is communicated with or closed to the first hole along with the rotation of the outer shell.

In a possible implementation manner, a flange is arranged on the inner shell, and the flange is abutted against the edge of the outer shell.

In a possible implementation manner, an accommodating space is arranged in the inner shell, and the accommodating space is used for storing filter materials capable of releasing the sterilizing and disinfecting gases.

In one possible implementation, the sterilizing gas is chlorine dioxide gas.

In a possible implementation manner, at least one air purification unit is further arranged in the body, and the air purification unit is communicated with the air inlet.

In a possible implementation mode, the concentration monitoring device further comprises a warning mechanism, the warning mechanism is connected with the controller, and the controller controls the warning mechanism to send warning information according to the concentration signal.

In a possible implementation manner, the air inlet is arranged above the body, and the air outlet is arranged on the side of the body.

In a possible implementation manner, the air conditioner further comprises a fan, and the fan is arranged in the body.

The second aspect of the present application also provides an air sterilization and disinfection method, wherein, with the air sterilization and disinfection device provided by the first aspect of the present application, the method comprises the following steps:

acquiring the concentration of sterilization and disinfection gas in the air;

judging whether the concentration is lower than a set value;

if yes, controlling the opening and closing degree of a release hole in the release mechanism to be increased in size;

if not, the opening and closing degree of a release hole in the control release mechanism is reduced in size.

The technical scheme provided by the application can achieve the following beneficial effects:

the application provides an air sterilization degassing unit and air sterilization disinfection method, can detect the concentration of the gaseous disinfection of disinfecting in the air through concentration detection sensor, and feed back to the controller, the controller can be according to the gaseous concentration control release mechanism action of disinfecting in the air, with the degree of opening and shutting size through release mechanism regulation release hole, thereby realize the control of the gaseous flow size of disinfecting from the release hole outflow in the unit interval, and then the gaseous concentration of disinfecting in the control air, reach the sterile effect of disinfecting of preferred.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic structural diagram of an air sterilizer provided in an embodiment of the present application;

FIG. 2 is a top view of an air sterilizer provided in the embodiments of the present application;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a state view of the inner and outer housings after assembly;

FIG. 5 is an exploded view of the inner and outer housings after assembly;

FIG. 6 is a line graph illustrating detection of chlorine dioxide concentration in one embodiment;

fig. 7 is a flowchart of an air sterilization and disinfection method provided in an embodiment of the present application.

Reference numerals:

1-body;

11-an air inlet;

12-an air outlet;

2-a release mechanism;

21-an inner housing;

211 — a first hole;

22-an outer shell;

221-a second hole;

23-a motor;

24-a cover plate;

3-an air purification unit;

4-a controller;

and 5, a fan.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

As shown in fig. 1 to 5, the present embodiment provides an air sterilization and disinfection apparatus, which includes a body 1, a concentration detection sensor, a release mechanism 2, and a controller 4; wherein, the body 1 is provided with an air inlet 11 and an air outlet 12; the concentration detection sensor is arranged in the body 1 and used for detecting the concentration of the sterilization and disinfection gas in the air and sending a concentration signal; the releasing mechanism 2 is arranged between the air inlet 11 and the air outlet 12, and a releasing hole for releasing the disinfecting and sterilizing gas is arranged on the releasing mechanism 2; the controller 4 controls the release mechanism 2 to change the opening degree of the release hole according to the concentration signal.

Wherein, the sterilization and disinfection gas can be chlorine dioxide gas or other gases with sterilization and disinfection functions. Wherein, chlorine dioxide is a green and environment-friendly sterilization and disinfection material recognized in the world, and the material not only has quick-acting sterilization and disinfection capability, but also can react with formaldehyde to finally generate safe carbon dioxide and water.

In this embodiment, the chlorine dioxide gas is preferably used as the sterilizing gas.

In the working process of the device, when the concentration of the chlorine dioxide in the air detected by the concentration detection sensor is lower than a set value, the controller 4 can control the release mechanism 2 to act according to a concentration signal sent by the concentration detection sensor, so that the release mechanism 2 adjusts the opening and closing degree of the release hole to increase, the flow of the gas containing the chlorine dioxide flowing out of the release hole in unit time is increased, the content of the chlorine dioxide in the air can be increased, and the effect of sterilizing and disinfecting the air is improved.

Wherein, the above set value may be 0.0001 ppm.

When the concentration detection sensor detects that the concentration of chlorine dioxide in the air is lower than the set value, the opening degree of the release hole reaches the maximum value, namely the release hole is completely opened, the filter material for releasing chlorine dioxide gas in the release mechanism 2 is invalid, and the device can be opened to replace the filter material in time, so that the monitoring of the service life of the filter material in the release mechanism 2 is realized.

Table one is the experimental data for H1N1 virus removal, as shown in table one below:

watch 1

Table I provides data on the removal of influenza A virus H1N1 from air, wherein three sample data of the virus content in air are 4.53 × 10 in the unremoved state⁶、2.86×10⁶、4.53×10⁶(ii) a After the air sterilization and disinfection device provided by the embodiment of the application is used for sterilizing influenza A virus H1N1 for 1H, three sample data of the virus content in the air are respectively 1.34 multiplied by 10³、9.04×10²、1.80×10³The removal rates respectively reach 99.86%, 99.84% and 99.82%. Therefore, the air sterilization and disinfection device realizes the effectiveness of sterilizing the influenza A virus H1N1 in the air.

Table two is the experimental data for H3N2 virus removal, as shown in table two below: watch two

Table II provides data on the removal of influenza A virus H3N2 from air, wherein three sample data of the virus content in air are 4.23 × 10 in the unremoved state⁵、7.18×10⁵、1.04×10⁶(ii) a After the air sterilization and disinfection device provided by the embodiment of the application is used for sterilizing influenza A virus H1N1 for 1 hour, three sample data of the virus content in the air are all less than 84, and the removal rates are respectively greater than 99.95%, 99.98% and 99.98%. Therefore, the air sterilization and disinfection device realizes the effectiveness of sterilizing the influenza A virus H3N2 in the air.

The third table is the experimental data for removing poliovirus-I type vaccine strains, and is shown in the third table below: watch III

Table III provides data on the removal of poliovirus type I vaccine strains in the air, wherein three sample data of the virus content in the air are respectively 7.18 multiplied by 10 under the unremoved state⁵、5.70×10⁵、5.20×10⁵(ii) a After the air sterilization device provided by the embodiment of the application is adopted for sterilization for 1 hour, three sample data of the virus content in the air are respectively 99.1 and 1.25 multiplied by 10²、1.25×10²The removal rates were 99.96, 99.95, and 99.94, respectively. Therefore, the air sterilization and disinfection device realizes the effectiveness of killing the poliovirus-I type vaccine strains in the air.

Table four shows the experimental data for enterovirus type 71 removal, as shown in table four below: watch four

Table four provides data on the removal of Enterovirus 71 from air, wherein three samples of the virus content in air were 8.43X 10 samples in the unremoved state⁵、9.91×10⁵、7.18×10⁵(ii) a After the air sterilization device provided by the embodiment of the application is adopted for sterilization for 1 hour, three sample data of the virus content in the air are respectively 2.12 multiplied by 10²、1.68×10²、1.68×10²The removal rates were 99.93, 99.95, and 99.94, respectively. Therefore, the air sterilization and disinfection device realizes the effectiveness of sterilization of the enterovirus 71 in the air.

As a specific implementation, the release mechanism 2 comprises a motor 23, an outer housing 22 and an inner housing 21; the release holes include a first hole 211 and a second hole 221; the fixed part of the motor 23 is fixedly connected with the body 1, and the driving part of the motor 23 is fixedly connected with the outer shell 22; the inner shell 21 is fixedly arranged in the body 1, and the outer shell 22 is rotatably sleeved on the inner shell 21; the first hole 211 is provided on the inner case 21, the second hole 221 is provided on the outer case 22, and the second hole 221 is communicated with or closed off from the first hole 211 with the rotation of the outer case 22.

When the controller 4 receives a concentration signal that the concentration of chlorine dioxide in the air is lower than a first set value, the controller 4 can control the motor 23 to start, the motor 23 can drive the outer shell 22 to rotate relative to the inner shell 21, so that the area of conduction between the second hole 221 and the first hole 211 on the outer shell 22 is increased, the flow rate of chlorine dioxide gas passing through the conduction part of the first hole 211 and the second hole 221 in unit time can be increased, the content of chlorine dioxide in the air can be supplemented quickly, and the effect of sterilization and disinfection on the air is improved. Wherein the first set value may be 0.0001 ppm.

When the controller 4 receives a concentration signal that the concentration of chlorine dioxide in the air is higher than the second set value, the controller 4 may control the motor 23 to drive the outer shell 22 to rotate in the opposite direction with respect to the inner shell 21, so that the area of the conduction between the second hole 221 on the outer shell 22 and the first hole 211 on the inner shell 21 is reduced, the first hole 211 and the second hole 221 are sealed after being completely staggered, and the chlorine dioxide gas is stopped from being supplemented into the air. Wherein the second set point may be 0.1 ppm.

Wherein, the first hole 211 extends a certain length in the circumferential direction of the inner housing 21, the second hole 221 extends a certain length in the circumferential direction of the outer housing 22, the lengths of the first hole 211 and the second hole 221 can be equal, when the first hole 211 and the second hole 221 are completely aligned, the maximum opening degree of the first hole 211 and the second hole 221 can be realized, and the chlorine dioxide gas can be rapidly supplemented into the air. When the second hole 221 is completely staggered with the first hole 211, the first hole 211 is blocked and closed by the solid part of the outer shell 22, and the second hole 221 is blocked and closed by the solid part of the inner shell 21, so that the chlorine dioxide gas can be stopped from being supplemented into the air.

The first holes 211 may be provided at intervals in both the circumferential direction and the axial direction of the inner housing 21, the second holes 221 may also be provided at intervals in both the circumferential direction and the axial direction of the outer housing 22, and the number of the first holes 211 and the second holes 221 in the circumferential direction and the axial direction may be specifically three, four, five, or six.

Specifically, in the present embodiment, when the motor 23 rotates by 25 °, the opening degree of conduction between the first hole 211 and the second hole 221 may be maximized, and when the motor 23 rotates by 12.5 °, the opening degree of conduction between the first hole 211 and the second hole 221 may be half of the maximum opening degree.

As a specific implementation manner, a flange is provided on the inner shell 21, and the flange abuts against the edge of the outer shell 22. So that the mounting positioning between the outer housing 22 and the inner housing 21 can be achieved by the burring.

As a specific implementation manner, an accommodating space is provided in the inner housing 21, and the accommodating space is used for storing filter materials capable of releasing chlorine dioxide.

Since chlorine dioxide is a gas at normal temperature, it is decomposed by heat or light, and thus is not suitable for long-term storage. Chlorine dioxide is used for sterilization, deodorization, antivirus and other applications through oxidation. In this embodiment, the filter material can release chlorine dioxide and can be incorporated into air. The filter material is solid particles, can keep a stable state for a long time, slowly releases chlorine dioxide, and meets the requirement that the filter material used as an air purification, sterilization and disinfection material has long service time; in addition, the filter material can be suitable for air purification equipment and is suitable for industrial popularization and application.

In addition, when the filter is placed in the inner case 21, the aromatic agent may be simultaneously put in. Because chlorine dioxide is a strong oxidant, the chlorine dioxide has obvious pungent taste to human body sense organ smell under a certain concentration, and the pungent taste on smell has certain influence on the wide use of chlorine dioxide. The smell of the chlorine dioxide is coupled by the smell of the aromatic agent while the chlorine dioxide is sterilized and disinfected, so that the smell sense of people does not have the pungent smell of the chlorine dioxide when the chlorine dioxide is sterilized and disinfected in the air.

In order to prevent the filtering material and the aromatic agent from falling off from the inner housing 21 due to external factors, a cover plate 24 may be covered on the inner housing 21 as shown in fig. 4 and 5. Wherein, the air entering from the housing inlet 11 can enter into the inner housing 21 through the first hole 211 to contact and react with the filter material.

In addition, the diameter of the cover plate 24 may be larger than that of the inner housing 21, and the edge of the cover plate 24 protrudes from the outer wall of the inner housing 21 to form the above-mentioned flange.

As a specific implementation manner, as shown in fig. 3, at least one air purification unit 3 is further disposed in the body 1, and the air purification unit 3 is communicated with the air inlet 11.

Air can enter from the air inlet 11, and impurities in the air are filtered by the air purification unit 3, and then the air can flow into the inner shell 21 to contact with the filter material in the inner shell 21, and the filter material releases chlorine dioxide gas and is further discharged through the release holes and the air outlet 12 on the body 1.

Specifically, the air purification unit 3 may be one or more of a glass fiber filter, a HEPA high efficiency filter, and an activated carbon filter. In the present embodiment, the air cleaning unit 3 is preferably a glass fiber filter.

As a specific implementation mode, the device further comprises a warning mechanism, the warning mechanism is connected with the controller 4, and the controller 4 controls the warning mechanism to send warning information according to the concentration signal sent by the concentration detection sensor.

Specifically, when the concentration detection sensor detects that the concentration of chlorine dioxide in the air is lower than a set value, the opening and closing degree of the release hole reaches a maximum value at the moment, which indicates that the filter material is not enough to generate chlorine dioxide with sufficient concentration to supplement the chlorine dioxide into the air, and at the moment, the controller 4 can control the warning mechanism to send warning information to remind personnel to replace the filter material in time. The warning mechanism may be a warning lamp or a buzzer, and the warning information may be brightness conversion or color conversion of the warning lamp, or warning sound conversion of the buzzer, and the like, which is not limited in this embodiment.

As a specific implementation manner, the air inlet 11 is disposed above the body 1, and the air outlet 12 is disposed at a side of the body 1. The above-mentioned upper and side portions refer to the upper and side portions in the perspective view shown in fig. 3. By arranging the air outlet 12 at the side of the body 1, the air outlet 12 can be conveniently opposite to the first hole 211 and the second hole 221, and the gas containing chlorine dioxide can be conveniently released into the air through the air outlet 12.

As a specific implementation manner, the device further comprises a fan 5, and the fan 5 is arranged in the body 1. Wherein, air outlet 12 on fan 5 and the body 1 sets up the both sides at shell 22 respectively, and fan 5 can blow in the chlorine dioxide gas that produces to the air from air outlet 12 to be favorable to chlorine dioxide to diffuse in the air, promote the homogeneity to disinfection of everywhere air sterilization in the space.

In the embodiment, at normal temperature, a PTFE (polytetrafluoroethylene) membrane with the aperture of 0.2-0.3 micrometer is used for wrapping 30g of chlorine dioxide filter material, the volume is 43 cubic centimeters, the mass is 30g, the total area of the release aperture is 10 square centimeters, and under the blowing of a fan 5 with the air quantity of an air outlet 12 being 30 cubic meters per hour, the content of chlorine dioxide in a room with the volume of 30 cubic meters after 1 hour is 0.03 ppm. In addition, the chlorine dioxide filter material can be continuously used for about 0-250 h, the service cycle is long, and meanwhile, the concentration of chlorine dioxide can be stabilized within 0.03 +/-0.01 ppm within 0-250 h, namely, the air sterilization and disinfection device provided by the embodiment of the application can keep the concentration of chlorine dioxide in the air stable, and guarantees the effectiveness of air sterilization and disinfection.

In addition, as shown in fig. 7, an embodiment of the present application further provides an air sterilization and disinfection method, which uses the air sterilization and disinfection apparatus provided in any embodiment of the present application, and the method includes the following steps:

and step S1, acquiring the concentration of the sterilizing and disinfecting gas in the air.

Wherein, the sterilizing gas can be chlorine dioxide, the concentration of the chlorine dioxide in the air can be detected by a concentration detection sensor, and simultaneously, a concentration signal can be sent out.

Step S2, judging whether the concentration is lower than a set value; if yes, go to step S3; if not, the flow proceeds to step S4.

Wherein, the controller can analyze the received concentration signal, compare the signal with the preset set value and judge, if the concentration of the sterilizing gas in the air is lower than the set value, then go to step S3; if the concentration of the sterilizing gas in the air is equal to or higher than the set value, the process proceeds to step S4.

And step S3, controlling the opening and closing degree of the release hole in the release mechanism to increase in size.

And step S4, controlling the opening and closing degree of the release hole in the release mechanism to be reduced in size.

Specifically, when the controller 4 receives a concentration signal that the concentration of chlorine dioxide in the air is lower than a first set value, the controller 4 may control the motor 23 to start, and the motor 23 may drive the outer shell 22 to rotate relative to the inner shell 21, so that the area of the conduction between the second hole 221 and the first hole 211 on the outer shell 22 is increased, and thus the flow rate of chlorine dioxide gas passing through the conduction part of the first hole 211 and the second hole 221 in unit time may be increased, thereby achieving the rapid supplement of the content of chlorine dioxide in the air, and improving the effect of sterilization and disinfection of the air. Wherein the first set value may be 0.0001 ppm.

When the controller 4 receives a concentration signal that the concentration of chlorine dioxide in the air is equal to or higher than a second set value, the controller 4 may control the motor 23 to drive the outer shell 22 to rotate in a reverse direction relative to the inner shell 21, so as to reduce the area of the conduction between the second hole 221 on the outer shell 22 and the first hole 211 on the inner shell 21, thereby reducing the flow rate of chlorine dioxide gas passing through the conduction part of the first hole 211 and the second hole 221 in unit time, or to realize the sealing of the first hole 211 and the second hole 221 after the first hole 211 and the second hole 221 are completely staggered, and to stop supplying chlorine dioxide gas into the air.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An air sterilizer, comprising:

the air conditioner comprises a body (1), wherein an air inlet (11) and an air outlet (12) are formed in the body (1);

the concentration detection sensor is arranged in the body (1) and is used for detecting the concentration of the sterilizing and disinfecting gas in the air and sending out a concentration signal;

the releasing mechanism (2) is arranged between the air inlet (11) and the air outlet (12), and a releasing hole for releasing the sterilizing and disinfecting gas is formed in the releasing mechanism (2);

a controller (4), wherein the controller (4) controls the release mechanism (2) to change the opening degree of the release hole according to the concentration signal.

2. An air sterilisation and disinfection apparatus as claimed in claim 1, characterised in that said release mechanism (2) comprises a motor (23), an outer housing (22) and an inner housing (21);

the release hole comprises a first hole (211) and a second hole (221);

the fixing part of the motor (23) is fixedly connected with the body (1), and the driving part of the motor (23) is fixedly connected with the outer shell (22);

the inner shell (21) is fixedly arranged in the body (1), and the outer shell (22) is rotatably sleeved on the inner shell (21);

the first hole (211) is formed in the inner housing (21), the second hole (221) is formed in the outer housing (22), and the second hole (221) is communicated with or closed to the first hole (211) along with rotation of the outer housing (22).

3. An air sterilizer as claimed in claim 2, wherein the inner housing (21) is provided with a flange which abuts against an edge of the outer housing (22).

4. An air sterilizer as claimed in claim 2, wherein the inner housing (21) has a receiving space provided therein for storing a filter material capable of releasing the sterilizing gas.

5. An air sterilizer as claimed in claim 4, wherein the sterilizing gas is chlorine dioxide.

6. An air sterilization and disinfection apparatus as claimed in claim 1, wherein at least one air purification unit (3) is further arranged in said body (1), said air purification unit (3) being in communication with said air inlet (11).

7. The air sterilization and disinfection device according to claim 1, further comprising a warning mechanism, wherein the warning mechanism is connected with the controller (4), and the controller (4) controls the warning mechanism to send out warning information according to the concentration signal.

8. An air sterilization and disinfection apparatus as claimed in claim 1, wherein said air inlet (11) is arranged above said body (1), and said air outlet (12) is arranged at the side of said body (1).

9. An air sterilizer as claimed in claim 1, characterized by further comprising a blower (5), said blower (5) being disposed in said body (1).

10. An air sterilization and disinfection method, characterized in that the air sterilization and disinfection device of any one of claims 1 to 9 is adopted, and the method comprises the following steps:

acquiring the concentration of sterilization and disinfection gas in the air;

judging whether the concentration is lower than a set value;

if yes, controlling the opening and closing degree of a release hole in the release mechanism to be increased in size;

if not, the opening and closing degree of a release hole in the control release mechanism is reduced in size.

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