KR20230148593A - Low Noise Negative Pressure Machine - Google Patents

Abstract

The present invention is a negative pressure machine that prevents internal contaminated air and bacteria from leaking out by making the indoor air pressure lower than that of the outside. More specifically, the housing divided into the first body and the second body is easily opened to generate suction force. It relates to a low-noise negative pressure device that can be reused after dismounting and cleaning the blowing fan, and emits the noise outside the housing after the noise of the fan is reduced.

Description

Low Noise Negative Pressure Machine}

The present invention is a negative pressure machine that prevents internal contaminated air and bacteria from leaking out by making the indoor air pressure lower than that of the outside. More specifically, the housing divided into the first body and the second body is easily opened to generate suction force. It relates to a low-noise negative pressure device that can be reused after dismounting and cleaning the blowing fan, and emits the noise outside the housing after the noise of the fan is reduced.

Recently, due to the problem of air pollution, the occurrence of various pathogens such as pneumonia virus, and infectious viruses, and the rapid increase in the number of allergy sufferers, microorganisms such as bacteria, fungi, and viruses, and harmful chemicals, etc., are removed from the air. A technology has been proposed.

In particular, medical institutions have the possibility of spreading or cross-infecting medical staff or other patients by spreading various viruses or pathogens originating from patients with specific diseases through the indoor air of the medical institution. It prevents microorganisms such as bacteria, fungi, and viruses from spreading outside.

The isolation space provided in a medical institution is called a negative pressure room. The negative pressure room is a space that controls the flow of air using differences in air pressure, and this difference in air pressure is implemented through a separate negative pressure machine. In other words, air has the characteristic of moving from high pressure to low pressure, and the negative pressure machine uses this characteristic of air to make the pressure inside the hospital room lower than the outside, preventing microorganisms such as bacteria, fungi, and viruses in the hospital room from leaking out. Do not allow it. Accordingly, the negative pressure room is used as a space to isolate and treat patients with contagious diseases.

Recently, COVID-19, which causes pneumonia symptoms that originated in Wuhan, China, has spread throughout the world, causing delta and omiclone mutations, and mutating into a more contagious virus.

In order to block the rapidly spreading COVID-19 epidemic at an early stage, the government of each country isolates infected people in negative pressure rooms to prevent the virus from spreading outside of society, thereby ensuring the safety of medical volunteers who provide medical services to infected people and preventing the spread of infection. We are making every effort to defeat the power.

Due to the rapid spread of the COVID-19 virus, the demand for negative pressure rooms has increased rapidly, and the demand for negative pressure machines that maintain the negative pressure in negative pressure rooms has also increased rapidly.

Looking at a conventional negative pressure machine, as described in <Negative pressure machine with air purification function> in Republic of Korea Patent Publication No. 10-2362241, it includes a housing that forms the appearance of the product; a pre-stage filter unit mounted on the air inlet side of the housing; a blowing fan for forcibly blowing air through the previous filter unit; It includes a discharge guide duct for guiding the discharge of air moving toward the discharge side by the blower fan.

Through this structure, the indoor air pressure is created as negative pressure, allowing the air flow to move from the outdoors to the indoors, preventing viruses from leaking outdoors and purifying them through a filter.

However, conventional negative pressure machines are expensive, and looking at the actual use of negative pressure machines, we find that rather than purchasing and using negative pressure machines individually, they are rented from a rental company and placed in the negative pressure room, and after the infected person recovers, the negative pressure machine in the negative pressure room where the infected person was isolated is discarded. By disposing, the virus remaining in the negative pressure chamber was removed.

This rental method causes great economic loss as the use of the negative pressure machine is limited to one infected person, so the rental company must bear the burden.

Therefore, this leads to an increase in the cost of negative pressure devices, and in emergency situations where negative pressure isolation rooms must be quickly expanded due to a rapid increase in patients, such as in the current coronavirus outbreak, the government's budget shortage and the negative pressure room management system make it difficult to immediately isolate the rapidly increasing number of infected people. It was difficult to respond.

In addition, in the case of the conventional negative pressure machine, in order to provide a virus and bacterial contamination prevention system, it could be applied only to places equipped with air conditioning facilities that serve as passageways for air to move, such as inlet pipes and discharge pipes. This led to the problem of high facility investment costs during the construction process.

Accordingly, in the era of the spread of large-scale contagious viruses such as COVID-19, in order to establish an immediate response system and enable negative pressure devices to be widely distributed, it is necessary to develop negative pressure devices with improved productivity so that the general public can purchase them at a minimum cost. am.

KR 10-2362241 (B1) 2022.02.08. KR 10-2011-0086942 (A) 2011.08.02.

In order to solve the above problem, the purpose of the present invention is to separate the housing forming the outer surface of the negative pressure machine into a first body and a second body, but combine them in a fitting manner to easily open the inside of the housing, and to provide a blowing fan and filter provided inside the housing. It provides a low-noise negative pressure device that can be easily mounted and dismounted, and is simple to connect and improves sealing power through a taping joint method using a sealing film without using bolts or nuts.

Another object of the present invention is to first reduce the noise generated by the operation of the blower fan by a sound-absorbing material attached to the inner surface of the blower guide part, and the joint portion of the first body and the second body made of soundproof material has a coupling protrusion and a coupling groove. It provides a low-noise sound pressure machine that is formed with a stepped soundproofing wall and is firmly coupled, and at the same time, noise is secondaryly reduced by the soundproofing wall.

Another object of the present invention is to provide a low-noise negative pressure machine with a structure optimized for negative pressure machine rental service by separating and combining discarded parts such as filters and discharge membranes and a sturdy and reusable blower fan.

Another object of the present invention is to minimize the spread of infectious diseases that may occur when reusing a used negative pressure machine by disposing of the remaining products such as housing, filters, and discharge membranes exposed to flowing air, excluding the blowing fan that requires robustness, and to minimize the spread of infectious diseases to users. The goal is to provide a low-noise negative pressure device that reduces rejection.

Another object of the present invention is to form a space where the filter receiving groove where the filter is inserted inside the housing is spaced apart from the intake port through which air is sucked in by the blowing fan, so that the air flowing into the housing passes only through the local area of the filter. It provides a low-noise negative pressure device that improves the purification efficiency of the filter by passing through the entire area of the filter and then being sucked into the intake port.

Another object of the present invention is that the discharge part that discharges air to the outside of the housing is rotatably fitted inside the housing, so that the discharge direction of the air varies depending on the rotated angle of the inclined discharge part, so that the air discharge direction is changed depending on the installation location of the negative pressure machine. The aim is to provide a low-noise negative pressure machine that can conveniently adjust the inclination direction of the discharge part by rotating the discharge part in the direction of smooth flow.

Another object of the present invention is to ensure that the discharge film is in close contact with the internal contact surface of the discharge unit by the elastic force of the fixing spring and at the same time is formed with a diameter larger than the diameter of the stepped protrusion surface, so that the discharge film subjected to a strong blowing force is not separated from the discharge unit. The goal is to provide a low-noise negative pressure device that prevents this.

Another object of the present invention is to replace the discharge membrane with a perforated membrane in which one end is sealed and an discharge hole is formed on the outer periphery, so that the air cleaned by the filter is discharged into the room through the discharge hole, thereby making it an air purifier. The goal is to provide a low-noise negative pressure device that can be utilized.

The present invention for achieving the above object has a hollow interior, an inlet 118 through which indoor air flows in, and is provided separately into a first body 110 and a second body 120. A housing 100 whose hollow interior is opened by opening either the first body 110 or the second body 120; A discharge part 200 coupled to the housing 100 and discharging to the outside of the housing 100; A sealing film ( 130); A blowing fan 300 provided inside the housing 100 and forming an air flow from the inlet 118 to the outlet 200; A filter 500 that is inserted from the outside to the inside of the first body 110 and is exposed at the rear end of the inlet 118; It includes a discharge film 600, one end of which is inserted into the interior of the discharge unit 200 to form a movement path for air discharged from the discharge unit 200.

In addition, a coupling protrusion 111 and a coupling groove 121 are formed at the joint portion of the first body 110 and the second body 120 of the present invention and engage with each other, and the coupling protrusion 111 is the coupling groove ( As it is inserted into 121, a stepped soundproof wall is formed at the joint of the first body 110 and the second body 120.

In addition, the first body 110 of the present invention includes a filter receiving groove 112 exposed to the outside of the housing 100 and accommodating the filter 500; A guide receiving groove 114 in which an intake port 116 through which air passing through the filter 500 is sucked in by the blowing fan 300 is formed in the central portion; and a space where the filter receiving groove 112 and the inlet 116 are spaced apart from each other, and a spacer 113 that guides the air passing through the filter 500 to the inlet 116 is further formed.

In addition, the present invention is arranged to surround the blowing fan 300 inside the housing 100, and induces wind power of the blowing fan 300 to the open surface 410 that is open to communicate with the discharge portion 200. It further includes a blowing guide part 400, and a sound-absorbing material 430 surrounding the blowing fan 300 is disposed on the inner surface of the blowing guide part 400, excluding the open surface 410.

In addition, the discharge portion 200 inclined in one direction of the present invention is fitted into the discharge portion receiving groove 117 formed in the housing 100, and the discharge portion 200 is connected to the discharge portion receiving groove 117. ), the air discharge direction guided by the discharge unit 200 changes as it rotates in the circumferential direction.

In addition, the outer surface of the blower guide part 400 of the present invention is provided with a coupling bracket 420 for fixing the blower guide part 400, and the coupling bracket 420 is a bracket formed inside the housing 100. It is detachably inserted and fixed into the receiving groove 124 to support the blowing guide part 400 inside the housing 100.

In addition, the discharge portion 200 of the present invention has an inner close contact surface 210 of a certain diameter and a stepped protrusion surface 220 of a smaller diameter than the inner close contact surface 210 formed at the end, and the discharge film 600 A fixing spring 630 is further provided on the inner surface of the device to bring the discharge film 600 into close contact with the inner contact surface 210 by elastic force. The discharge film 600 in the closely contacted portion is formed to have a diameter larger than the diameter of the stepped protrusion surface 220.

In addition, the discharge membrane 600 of the present invention is purified by the filter 500 and the air discharged to the discharge unit 200 passes through the discharge hole 621 formed on the outer periphery of the discharge membrane 600. It is formed with a perforated membrane 620 that is discharged indoors.

The low-noise negative pressure machine according to the present invention separates the housing that forms the outer surface of the negative pressure machine into a first body and a second body, but is joined by a fitting method, so that the inside of the housing can be easily opened and the blowing fan and filter provided inside the housing can be easily removed. It can be done using a taping joint method using sealing film without using bolts or nuts, which has the advantage of being simple to join and improving sealing power.

In addition, in the present invention, the noise generated by the operation of the blowing fan is primarily reduced by a sound-absorbing material attached to the inner surface of the blowing guide part, and the joint portion of the first body and the second body made of soundproofing material has a joint protrusion and a stepped groove. It has the advantage of being formed as a soundproof wall and being firmly combined, and at the same time, noise is secondaryly reduced by the soundproof wall.

In addition, the present invention has the advantage of having a structure optimized for negative pressure machine rental service by separately combining discarded parts such as filters and exhaust membranes and a blowing fan that is sturdy and can be reused.

In addition, the present invention minimizes the spread of infectious diseases that may occur when reusing a used negative pressure machine by disposing of the remaining products such as housing, filters, and discharge membranes exposed to flowing air, excluding the blowing fan that requires robustness, and user resistance. It has the advantage of reducing .

In addition, in the present invention, the filter receiving groove where the filter is inserted inside the housing is formed with a space where the intake port through which air is sucked by the blowing fan is spaced apart from each other, so that the air flowing into the housing does not pass through only the local area of the filter. It has the advantage of improving the purification efficiency of the filter because it is sucked into the suction port after passing through the entire area of the filter.

In addition, in the present invention, the discharge part that discharges air to the outside of the housing is fitted so as to be rotatable inside the housing, so that the discharge direction of air varies depending on the rotated angle of the inclined discharge part, so that the flow of air depends on the installation location of the negative pressure machine. There is an advantage that the inclination direction of the discharge part can be conveniently adjusted by rotating the discharge part in the direction of smooth flow.

In addition, the present invention allows the discharge film to be in close contact with the inner contact surface of the discharge part by the elastic force of the fixing spring, and at the same time, is formed to have a diameter larger than the diameter of the stepped protrusion surface, thereby preventing the discharge film subjected to a strong blowing force from being separated from the discharge part. There is an advantage to this.

In addition, the present invention replaces the discharge membrane with a perforated membrane in which one end is sealed and an discharge hole is formed on the outer periphery, so that the air cleaned by the filter is discharged into the room through the discharge hole, so that it can also be used as an air purifier. There are advantages to this.

Figure 1 is an overall perspective view of the low-noise negative pressure machine of the present invention.
Figure 2 is an exploded perspective view of the low-noise negative pressure machine of the present invention.
Figure 3 is a cross-sectional perspective view of the low-noise negative pressure machine of the present invention.
Figure 4 shows the first body of the low-noise negative pressure device of the present invention, (a) is a front perspective view, and (b) is a rear perspective view.
Figure 5 shows the second body in the low-noise negative pressure device of the present invention, (a) is a front perspective view, and (b) is a rear perspective view.
Figure 6 is a cross-sectional perspective view of the first body and the second body combined in the low-noise negative pressure machine of the present invention.
Figure 7 is a perspective view of the filter, blowing fan, and blowing guide part in Figure 6 combined.
Figure 8 is an exploded perspective view showing the blower fan and blower guide part of the low-noise negative pressure machine of the present invention.
Figure 9 is an exploded perspective view of the low-noise negative pressure machine of the present invention with a back plate without a blowing guide portion.
Figure 10 is a state in which the discharge membrane is mounted as a perforated membrane in the low-noise negative pressure machine of the present invention, (a) is an overall perspective view, and (b) is a longitudinal cross-sectional perspective view.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement them.

As shown in Figures 1 to 9, the low-noise negative pressure machine according to the present invention is a negative pressure machine that maintains the indoor air pressure at a lower negative pressure than the outside,

The interior is hollow, and an inlet 118 through which indoor air flows is formed, and is provided separately into a first body 110 and a second body 120. Housing (100) whose hollow interior is opened by opening any one of (120);

a discharge unit 200 coupled to the housing 100 and discharging air introduced into the housing 100 to the outside of the housing 100;

A seal is provided along the seam of the first body 110 and the second body 120, and is arranged at a certain width up and down from the seam to secure the first body 110 and the second body 120 from the outer surface. film (130);

A blowing fan 300 provided inside the housing 100 and forming an air flow from the inlet 118 to the outlet 200;

A blowing guide unit disposed inside the housing 100 to surround the blowing fan 300 and guiding the wind power of the blowing fan 300 to an open surface 410 open in communication with the discharge part 200. (400);

A filter 500 inserted into the housing 100, in close contact with the inner surfaces of the first body 110 and the second body 120, and disposed at the rear end of the inlet 118;

It includes a discharge film 600, one end of which is inserted into the interior of the discharge unit 200 to form a movement path for air discharged from the discharge unit 200.

In general, a negative pressure machine sets the indoor air pressure in the negative pressure room where the infected person is isolated to be lower than the outside, allowing air to flow from the outdoors to the inside, and preventing air from flowing from the inside to the outdoors, so that viruses, bacteria, etc. present in the negative pressure room can escape to the outside. It is a negative pressure device that does not leak.

The negative pressure machine of the present invention is placed in an indoor space, such as a negative pressure hospital room, and operates the blowing fan 300 to suck indoor air through the inlet 118, purifies the air through the filter 500, and then blows the air through the window. The inhaled air is discharged through the discharge membrane 600 connected to the outside of the negative pressure room. By continuously sucking in the air inside the negative pressure room and discharging it to the outside, the air pressure in the negative pressure room equipped with a negative pressure machine is lowered, thereby achieving negative pressure.

The negative pressure machine of the present invention has a housing 100 that forms the exterior and is composed of a first body 110 and a second body 120, the joints are sealed with a sealing film 130, and air flow is prevented inside the housing 100. A blowing fan 300 is disposed. By operating the blowing fan 300, indoor air is sucked in through the inlet 118, the air is purified by passing through the filter 500, and it is discharged to the outside of the housing 100 through the outlet 200. do.

Since the housing 100 is composed of a first body 110 and a second body 120, the inside of the housing 100 is opened by opening at least one of the first body 110 and the second body 120. It can be easily opened, and the filter 500 and blower fan 300 disposed inside the housing 100 can be inspected and purification work can be easily performed.

When reusing the negative pressure device of the present invention, the filter 500 and discharge membrane 600 are replaced with clean ones, and the blower fan 300 and blower guide part 400 are disinfected and maintained and then returned to the inside of the housing 100. It can be installed and reused.

At this time, the manager can determine whether the housing 100, which consists of the first body 110 and the second body 120, can be reused with only a little maintenance by determining the degree of damage, or can be replaced with a new one.

When the first body 110 and the second body 120 are coupled, the coupling protrusion 111 is inserted into the coupling groove 121 and is attached to the joint between the first body 110 and the second body 120. A soundproof wall is formed. When the blowing fan 300 inside the housing 100 is operated, the noise of the blowing fan 300 is not immediately emitted from the joint between the first body 110 and the second body 120, but hits the curved and stepped soundproof wall. The noise is emitted to the outside with reduced intensity.

In addition, since the filter 500 is mounted in close contact with the inner surfaces of the first body 110 and the second body 120, the noise of the blowing fan 300 cannot be easily emitted into the housing 100, and the noise is not transmitted through the filter. As it passes through 500, it collides with the lattice structure of the filter 500 and its intensity is weakened, thereby reducing noise.

Therefore, the negative pressure machine of the present invention not only facilitates maintenance work because the housing 100 can be easily separated and the internal structure of the housing 100 can be removed, but also the noise of the blowing fan 300 is reduced and discharged to the outside of the housing 100. It has a structure with excellent quietness.

As shown in Figures 1 and 2, the low-noise sound pressure generator according to the present invention is provided with a housing 100 that forms the exterior. The housing 100 is hollow and is provided with a filter 500, a blower fan 300, and a blower guide part 400 to be described later, and a discharge part 200 is mounted on one side.

The housing 100 may be made of a foamed styrene resin (brand name: Styrofoam) material with a soundproofing effect, so it has the advantage of soundproofing noise generated from the blower fan 300 and being economically inexpensive. This type of expanded styrene resin has the characteristic of changing its appearance when applied with low power. The present invention reduces noise and improves sealing ability by using this economically inexpensive and easily deformable characteristic under pressure.

However, the material of the housing 100 of the present invention is not limited to expanded styrene resin material, and gypsum board, plywood, rubber, sponge, mat, etc. with soundproofing performance can also be used, and the noise of the blowing fan 300 can be reduced. Any material can be used as long as it has sound insulation performance that can be reduced and some strength that can support the internal structure.

Since the housing 100, which forms the exterior of the negative pressure device, is made of a relatively inexpensive material, when the negative pressure device is inspected for reuse after it has been used once, the soundproofing performance and the supporting strength of the internal structure are sufficient without significant damage to the exterior. It can be used again after maintenance such as disinfection work, and if the soundproofing performance and support strength are judged to be insufficient, a new housing 100 can be provided and used again at a low cost, which has an economical advantage.

An inlet 118 is formed on one side of the housing 100 that is open and allows air outside the housing 100 to flow into the housing 100 by the suction force of the blowing fan 300, and on the other side, the housing ( 100) An outlet 200 is provided through which air introduced inside is discharged to the outside. The discharge part 200 is a separate component that is inserted into the discharge part receiving groove 117 of the housing 100.

According to one embodiment of the present invention, the surface where the inlet 118 is formed in the housing 100 and the surface where the outlet 200 is coupled are shown to be at a right angle, so that the air flow is curved. However, this is not limited to this. No, the idea of the present invention can be implemented if the inlet 118 and the outlet 200 are arranged so that air can be sucked in from one direction and discharged from the other direction.

The inlet 118 is a surface through which external air is sucked in when the blower fan 300 operates, and is formed with a large area on one side of the housing 100 to improve suction efficiency.

In one embodiment of the present invention, the inlet 118 is formed as a part of one side of the housing 100 excluding the groove, and the air passing through the inlet 118 passes through the filter 500. do.

The inlet portion 118 is placed in a path through which a filter 500, which will be described later, passes to be inserted into the filter receiving groove 112 of the housing 100. In the present invention, the filter 500 can be mounted through the inlet 118 without opening the inside of the housing 100 with the first body 110 and the second body 120 combined. The filter 500 passes through the inlet 118 and reaches the filter receiving groove 112, and installation into the housing 100 is completed.

The inlet 118 may be formed to be slightly larger than or equal to the area of the filter 500, which will be described later, so that the filter 500 passes through the inlet 118 and is placed in the filter receiving groove 112. When possible, it can be inserted gently, or it can be joined by force fitting.

The air that flows into the housing 100 through the inlet 118 is discharged to the outside of the housing 100 through the discharge portion 200 shown in FIGS. 1 to 3. In one embodiment of the present invention, the discharge part 200 is provided as a separate structure and is inserted into the discharge part receiving groove 117 of the housing 100, but is formed on one side of the housing 100 ( 100) can also be formed in a groove shape that allows the inside and outside to communicate.

The discharge portion receiving groove 117 formed in the housing 100 is a groove into which the discharge portion 200 is inserted. Referring to Figures 4 to 7, which are drawings according to an embodiment of the present invention, the discharge portion receiving groove 117 is formed by combining the first body 110 and the second body 120 with each other, This is due to the direction in which the housing 100 is divided into the first body 110 and the second body 120, and the outlet receiving groove 117 is located on one side of the first body 110 or the second body 120. ) may be formed on one side of the. The direction of the surface where the outlet receiving groove 117 is formed in the housing 100 is determined by a person skilled in the art to divide the air flow path and the housing 100 into the first body 110 and the second body 120. It can be easily modified by considering the direction.

The discharge portion receiving groove 117 is formed in the circumferential direction along the central axis, and the discharge portion 200 fitted into the discharge portion receiving groove 117 has a structure in the circumferential direction in which the discharge portion receiving groove 117 is formed. It is possible to rotate accordingly.

The discharge part 200 fitted into the discharge part receiving groove 117 is formed in a shape that protrudes out of the housing 100 and is inclined to adjust the discharge direction of air.

The discharge part receiving groove 117 is formed to be stepped, so that a catching effect can be induced so that the discharge part 200 inserted into the discharge part receiving groove 117 does not easily fall out. However, this locking structure does not restrict rotation of the discharge unit 200 in the circumferential direction while it is inserted into the discharge unit receiving groove 117.

When the housing 100 is placed on the floor of the negative pressure room, an air discharge passage is formed by inserting an exhaust film 600, which will be described later, into the discharge part 200 on a window that allows access to the outside of the negative pressure room, thereby forming the housing ( 100) The air inside is discharged to the outdoors. Since windows are usually located higher than the floor, the discharge unit 200 may be formed to be inclined to face upward. However, the discharge unit 200 according to an embodiment of the present invention is not limited to an inclined shape, and may be formed horizontally without an inclination or inclined laterally, and may be formed to allow air flow to discharge air to the outside. Any assistance is sufficient.

When the discharge unit 200 is formed to be inclined, the direction in which the inclination is directed changes. A person handling a negative pressure machine can rotate the discharge unit 200 while it is inserted into the discharge unit receiving groove 117, so that the inclined discharge unit 200 faces upward, downward, or to the side. there is.

Considering the height at which the housing 100 is placed and the position of the window, the discharge slope is adjusted to form an optimized air discharge passage, thereby adding air movement force and improving discharge performance.

The air moves to the window along the inclined discharge path of the discharge unit 200, so the air can be discharged quickly with less flow loss.

Since the air discharged through the discharge part 200 receives the power of the blowing fan 300 and moves at a high flow rate, it is sufficient to have an area smaller than that of the inlet part 118.

The outer surface of the discharge film 600, which will be described later, is in close contact with the inner contact surface 210 of the discharge portion 200. A fixed spring 630 having elastic force is provided inside the discharge membrane 600, and the fixed spring 630 expands the diameter of the discharge membrane 600 with an expansion force due to the elastic force.

An end opposite to one end where the discharge film 600 is coupled to the housing 100 is formed with a stepped protrusion surface 220 having a smaller diameter than the inner contact surface 210. The stepped protrusion surface 220 protrudes further inward from the end of the discharge unit 200 to form a step, and prevents the discharge film 600 from being separated from the discharge unit 200.

The discharge film 600 is in close contact with the inner contact surface 210 of the discharge unit 200 by the fixing spring 630 and its diameter expands. At this time, the fixing spring 630 and the discharge film 600 are expanded larger than the diameter of the stepped protrusion surface 220 due to the expansion force of the fixing spring 630, so the fixing spring 630 and the discharge film 600 are expanded. It is difficult to pass through the step protrusion surface 220 forming the step and it becomes caught, so it is possible to prevent it from coming off.

The discharge film 600 is formed of a thin vinyl material and is pressurized by the blowing force generated by the blowing fan 300, and has a structure composed of an inner contact surface 210 and a stepped protrusion surface 220 of the discharge portion 200. As a result, even if a strong blowing force is generated, it is firmly supported by the discharge part 200 and does not fall off.

The discharge unit 200 is combined with the housing 100 to form the external shape of the negative pressure machine of the present invention together with the housing 100, and the first body 110 and the second body 120 form the housing 100. Unlike the separate configuration, it is formed as an integral piece and is not separated.

In forming the discharge part 200, there is no joint part between the first body 110 and the second body 120, so a separate joining process is not required to form the shape. Therefore, even if the fixing spring 630 presses a strong elastic force on the inner surface of the discharge part 200, the external shape of the discharge part 200 is not damaged, and the discharge part 200 is attached to the fixing spring 630 on the inner surface. can support external forces.

The discharge part 200 is coupled to the discharge part receiving groove 117 formed by combining the first body 110 and the second body 120 (according to one embodiment of the present invention, in another embodiment, the The discharge part receiving groove 117 may not be divided), and even if the fixing spring 630 presses the inner surface of the discharge part 200 with strong elastic force, the discharge part 200 is firmly supported, thereby supporting the first body 110. ) and the second body 120 are combined to form the outer shape of the housing 100 without applying any burden.

As shown in FIGS. 1 to 2 and 4 to 7, the housing 100 is divided into a first body 110 and a second body 120 so that the inside can be opened. The first body 110 and the second body 120 according to an embodiment of the present invention are formed by longitudinally sectioning the housing 100, and then forming one configuration into the first body 110 and the other configuration into the second body. It was classified as (120). However, this is for convenient naming of the configuration and is not limited to this configuration. In order to open the inside of the housing 100, it is sufficient as long as the housing 100 can be divided into two parts and separated at various angles and directions, whether in longitudinal or transverse cross-section, and is connected to the first body 110 and the second body 120. The formed structure is not necessarily limited to any specific configuration.

For example, the inlet portion 118, the separation portion 113, and the filter receiving groove 112 formed in the first body 110 of the present invention are formed in the second body 120 according to the separation angle and direction of the housing 100. ) may also be formed in part or in full.

The first body 110 and the second body 120 constitute the housing 100, and the interior of the housing 100 can be opened by opening one or more of them.

Since the purpose of the negative pressure device of the present invention is to provide it in a reusable state rather than a one-time use, once the filter 500, blower fan 300, and blower guide unit 400 provided inside the housing 100 are used, Before being placed in another patient's negative pressure room, maintenance, including cleaning and maintenance, is performed.

For this maintenance process, the interior of the housing 100 can be opened by opening either the first body 110 or the second body 120, and the filter 500 disposed inside the housing 100 ), the blower fan 300 and the blower guide unit 400 can be inspected and maintained.

It is preferable that the filter 500 is disposable and discarded after use, and it is economical to sterilize the blowing fan and blowing guide part 400, which are relatively expensive and heavy items, through disinfection and cleaning, and then sterilize them and then mount them back on the housing 100. It is also hygienic.

Due to the housing 100 being separately composed of the first body 110 and the second body 120, it is easy to enter the internal space and perform appropriate maintenance work, so the negative pressure device of the present invention can be performed through a series of maintenance procedures. It can be reused. Therefore, economic feasibility increases and even if an infectious disease spreads and the number of infected people increases rapidly, the process required to install a negative pressure machine can be omitted, so a negative pressure room can be quickly prepared to respond and cope with the infectious disease.

A coupling protrusion 111 and a coupling groove 121 shown in FIGS. 4 to 6 are formed at the joint portion of the first body 110 and the second body 120. The coupling protrusion 111 is inserted into the coupling groove 121 so that the first body 110 and the second body 120 are engaged with each other.

The coupling protrusion 111 and the coupling groove 121 are formed at the joint of the first body 110 and the second body 120. In one embodiment of the present invention, a coupling protrusion 111 is formed on the first body 110 and a coupling groove 121 is formed on the second body 120, so that the coupling protrusion 111 of the first body 110 is formed. ) is inserted into the coupling groove 121 of the second body 120, thereby completing the coupling of the first body 110 and the second body 120. However, the positions of the coupling protrusion 111 and the coupling groove 121 are not limited to this, and the coupling protrusion 111 is positioned at the joint of the first body 110 and the second body 120 in the coupling groove 121. Any structure in which the first body 110 and the second body 120 are coupled by being inserted into the structure is included in the scope of the present invention.

When the coupling protrusion 111 is inserted into the coupling groove 121, a soundproof wall is formed at the joint between the upper body and the lower body. The soundproof wall actually refers to the step formed by the coupling protrusion 111 and the coupling groove 121 and does not mean a new structure or configuration.

As the coupling protrusion 111 is inserted into the coupling groove 121, a stepped soundproof wall is formed at the joint between the upper body and the lower body, so the noise of the blowing fan 300 provided inside the housing 100 is the first. As it passes through the joint between the body 110 and the second body 120, it collides with the soundproof wall, and the intensity of the noise is weakened and reduced, so the quietness of the sound pressure device of the present invention is increased.

In addition, the soundproofing wall formed by the coupling protrusion 111 and the coupling groove 121 is arranged to surround the outer periphery of the blowing fan 300, so the noise generated from the blowing fan 300 is bound to collide with the soundproofing wall. It is effective in reducing the noise of the blowing fan (300).

The outer surface of the joint between the first body 110 and the second body 120 is surrounded and sealed with a sealing film 130. The sealing film 130 may be made of an adhesive vinyl material such as tape.

The coupling protrusion 111 is inserted into the coupling groove 121 and the sealing film 130 is applied to the joint portion of the outer surface of the housing 100 to fix the coupled state of the first body 110 and the second body 120. ) is attached.

The sealing film 130 is formed to have a certain width and is disposed at a certain width up and down at the seam portion to secure the first body 110 and the second body 120 from the outer surface.

Looking at the internal structure of the housing 100 consisting of the first body 110 and the second body 120 in more detail with reference to FIGS. 4 to 7, the inside of the housing 100 includes a filter 500. ), a filter receiving groove 112 for accommodating the blower fan 300 and the blowing guide portion 400, a guide receiving groove 114 for accommodating the discharge portion 200, and a discharge portion receiving groove for accommodating the discharge portion 200 ( 117) etc. are formed.

The groove that accommodates this configuration does not necessarily have to be formed in the first body 110 or the second body 120, and can be modified in various ways by a person skilled in the art depending on the direction in which the housing 100 is divided. As the first body 110 and the second body 120 are divided, these grooves may also be formed.

The filter receiving groove 112 is formed at the rear end of the inlet 118 in the first body 110. The filter receiving groove 112 is exposed to the outside of the housing 100 so that the filter 500 can be removed and installed from the outside of the housing 100 without opening the inside of the housing 100.

The filter 500 disposed in the filter receiving groove 112 passes through the inlet 118 and reaches the filter receiving groove 112, and installation is completed.

Since the filter 500 must be able to pass through the inlet 118 in order to reach the filter receiving groove 112, the size of the filter receiving groove 112 is formed to be slightly smaller than the size of the inlet 118, or Or formed the same way.

It is desirable that there is no gap between the filter receiving groove 112 and the filter 500. The filter receiving groove 112 is an entry part through which air enters the inside of the housing 100, and an exit part through which noise generated by the blowing fan 300 is discharged to the outside of the housing 100. Therefore, since the purpose of the present invention is to reduce the noise of the blowing fan 300 while passing through the filter 500, the noise of the blowing fan 300 can pass through the filter receiving groove 112 and the inlet 118. In order to pass through the filter 500, the outer surface of the filter 500 and the filter receiving groove 112 are brought into close contact.

Therefore, packing 112a is further provided to eliminate the gap between the filter receiving groove 112 and the filter 500. The packing (112a) is provided along the filter receiving groove (112), and is provided in the entire area of the filter receiving groove (112) or in a portion thereof.

The filter 500 may be accommodated in the filter receiving groove 112 in an interference fit manner by the packing 112a. The press-fitted filter 500 does not form a gap with the filter receiving groove 112, so when air flows into the housing 100, it passes only through the filter 500 to purify the filter 500. Performance is maintained, and since the noise of the blowing fan 300 is emitted through the filter 500, the intensity is weakened by the filter 500, thereby improving the noise reduction effect.

A guide receiving groove 114 is formed at the rear end of the filter receiving groove 112 to accommodate the blowing fan 300 and the blowing guide portion 400 surrounding the blowing fan 300. Since the blowing fan 300 and the blowing guide part 400 are disposed on the center side of the joint between the first body 110 and the second body 120, the guide receiving groove 114 is located on the first body 110 and the second body 120. It may be formed in both 110 and the second body 120. This is to easily remove the blowing fan 300 by opening the housing 100. Since the blowing fan 300 is disposed at the joint between the first body 110 and the second body 120, it can be easily pulled out when the housing 100 is opened.

The guide receiving groove 114 formed in the first body 110 is formed as a wall to separate the internal space from the filter receiving groove 112, and an inlet 116 is formed in the center.

The inlet 116 is a groove through which air that flows into the housing 100 from the inlet 118 and passes through the filter 500 mounted in the filter receiving groove 112 is sucked in by the blowing fan 300. The guide receiving groove 114 formed in the first body 110 divides the space where the blowing fan 300 is placed and the space where the filter 500 is accommodated, like a partition, and allows air to flow through the inlet 116. The flow is guided to the blowing fan (300).

A spacing portion 113 is formed in the first body 110, which is a space where the filter receiving groove 112 and the suction port 116 are spaced apart from each other. Due to the spacer 113, the intake port 116 and the filter 500 are spaced apart from each other.

Since the intake port 116 is located in the center of the guide receiving groove 114, the air flow is concentrated in the center due to the intake of the blowing fan 300. However, since the inlet 116 and the filter 500 are separated by the space of the spacer 113, the air flow flowing into the housing 100 from the inlet 118 is at the edge of the filter 500. It can pass through the filter 500 in the entire area including, and after passing through the filter 500, sufficient space is secured for the air flow to gather from the spaced portion 113 to the intake port 116.

Therefore, when air is sucked into the housing 100, the air flow is not concentrated only in the local area of the filter 500 that is close to the intake port 116, but passes through the entire area of the filter 500, so the filter 500 ) Purification efficiency is improved compared to the area of .

The air flow passing through the edge of the filter 500 can smoothly flow toward the inlet 116 because the space for curvature to flow from the spacer 113 to the inlet 116 is sufficiently secured by the spacer 113. there is.

The guide receiving groove 114 is also formed in the second body 120. An inlet 116 is formed in the guide receiving groove 114 of the first body 110, and the guide receiving groove 114 of the second body 120 is a blowing motor 310 that operates the blowing fan 300. A motor receiving groove 122 is formed to accommodate the.

In the second body 120, a blower motor 310 is accommodated inside the housing 100, and a controller 320 is provided on the outer surface of the second body 120 in place of the motor receiving groove 122. And, a cable groove 123 is formed so that the power cable 321 connected to the controller 320 can pass through. However, the position and shape of the controller 320 and the cable groove 123 provided near the motor receiving groove 122 are not limited to this and can be changed in various ways.

The guide receiving groove 114 formed in the second body 120 has a plurality of bracket receiving grooves 124 formed at the edges. The bracket receiving groove 124 is a groove that supports the blowing guide portion 400 by accommodating the coupling bracket 420 provided on the outer periphery of the blowing guide portion 400. The position where the bracket receiving groove 124 is formed is not limited to the second body 120 and may also be formed in the first body 110.

A bracket receiving groove 124 is formed in the second body 120 to accommodate the coupling bracket 420 of the blowing guide part 400, so that the blowing guide part 400 is mounted inside the housing 100 and It is easy to attach and detach, and since the housing 100 firmly supports the blower guide part 400 on the outer surface, it can suppress vibration and shaking that may occur when the blower fan 300 operates.

The guide receiving groove 114 formed in the first body 110 and the second body 120 supports and contacts the blowing guide portion 400 on the outer surface, and the portion that communicates with the discharge receiving groove 117 A blowing surface 115 in an open state is formed.

The blowing surface 115 has an open shape so that it can be discharged to the outside of the housing 100 along the air flow formed by the blowing fan 300, and is in communication with the discharge portion 200.

The blowing surface 115 may be formed on one side of the guide receiving groove 114, but may be changed in various ways along any blowing direction.

Meanwhile, the present invention can be operated only with the thick plate 330 without the blowing guide unit 400. As shown in Figure 9, there is no blowing guide portion 400 provided in an arc shape, and there is a thick plate 330 between the blowing fan 300 and the blowing motor 310, and a coupling bracket 420 at the corner of the thick plate 330. This is combined. Even in this shape, the thick plate 330 is accommodated in the guide receiving groove 114 of the second body 120, the blower motor 310 is accommodated in the motor receiving groove 122, and the coupling bracket 420 is accommodated in the second body 120. It is accommodated in the bracket receiving groove 124 of the body 120, so it is easy to attach and detach from the inside of the housing 100, and can suppress vibration and shaking that may occur due to the operation of the blowing fan 300.

The blowing fan 300 shown in FIG. 7, which is disposed in the central part of the housing 100, allows air to flow into the housing 100 and discharges it to the outside through the discharge unit 200, thereby allowing the air to flow in one direction. It is a composition that forms.

The blowing fan 300 is disposed inside the guide receiving groove 114 and is surrounded by the blowing guide portion 400.

The blowing guide unit 400 is disposed in the guide receiving groove 114 inside the housing 100, and accommodates the blowing fan 300 therein.

The blowing guide part 400 is open on one side through the inlet 116, and the guide receiving groove 114 of the second body 120 is formed as a sealed surface, and the guide receiving groove 114 It is formed as a sealing surface along the circumferential direction.

The blower guide unit 400 guides the blower flow generated by the blower fan 300 toward the discharge unit 200 when the blower motor 310 operates and the blower fan 300 rotates.

At this time, the position of the open surface 410 of the blowing guide unit 400 can be changed to a direction other than the direction shown in the drawing according to an embodiment of the present invention in consideration of the air flow formed by the blowing fan 300. You can.

The blowing guide unit 400 is disposed in the guide receiving groove 114 of the housing 100. A coupling bracket 420 that protrudes further in a radial outer direction of the blower guide part 400 is further provided on the outer periphery of the blower guide part 400.

The coupling bracket 420 is inserted into the bracket receiving groove 124 of the second body 120 and is firmly coupled to and supported by the housing 100.

Since the bracket receiving groove 124 is formed to accommodate the coupling bracket 420, the blowing guide part 400 and the blowing fan 300 are coupled to and attached to the housing 100. The convenience of separation is excellent.

A sound-absorbing material 430 may be further disposed in the space between the blowing guide unit 400 and the blowing fan 300. The sound absorbing material 430 can absorb fan noise generated from the blowing fan 300 and reduce the intensity of noise emitted to the outside of the housing 100.

The noise of the blowing fan 300 emitted to the outside of the blowing guide unit 400 is reduced by the sound absorbing material 430, and also, as it passes through the housing 100, the noise is increased by the material of the housing 100. is reduced, and the intensity of the noise emitted to the inlet 118 through the filter 500 is further weakened and reduced as it passes through the filter 500.

Therefore, due to the structure in which the noise generated by the blowing fan 300 is reduced several times, the intensity of the noise of the fan in the negative pressure room is inevitably weakened, and it does not cause inconvenience to patients in the negative pressure room.

The blower motor 310 that rotates the blower fan 300 is disposed in the motor receiving groove 122 and is connected to the power cable 321 to receive power from an external power source.

The controller 320 provided in the blower motor 310 operates and controls the motor. The blower motor 310 can be safely operated by controlling and controlling the external power supplied from the power cable 321.

According to one embodiment of the present invention, the controller 320 is shown mounted on the outside of the blower motor 310, but the controller 320 may be installed inside or outside the housing 100. .

Referring to FIGS. 1, 3, and 9, a discharge membrane 600 is inserted into the discharge portion 200. The discharge membrane 600 is configured to extend further from the discharge portion 200 and guide air to the outside of the negative pressure room.

The discharge film 600 may be made of an economical and inexpensive vinyl material.

The discharge film 600 is further provided with a fixing spring 630 at an end that is fitted with the discharge portion 200. The fixing spring 630 is configured to fix the coupling state of the discharge film 600 with the discharge portion 200.

The fixing spring 630 is disposed on the inner surface of the discharge membrane 600 and expands the diameter of the discharge membrane 600 with an elastic expansion force. The expanded discharge film 600 is tightly coupled to the inner contact surface 210 of the discharge portion 200.

The diameter of the discharge film 600 expanded by the elasticity of the fixing spring 630 is formed to be larger than the diameter of the stepped protrusion surface 220 of the discharge portion 200. Therefore, the fixing spring 630 is caught by the stepped protrusion surface 220 and does not fall out, and the discharge portion 200 and the discharge membrane 600 can be maintained in close contact.

The discharge film 600 may be made of a vinyl material, so when it receives a blowing force from the blower fan 300, it is forced to separate from the discharge portion 200, but is kept in close contact with the fixing spring 630. Since the connection is maintained, it does not escape from the discharge unit 200 even if a strong blowing force occurs.

As shown in Figures 1 to 3, the discharge film 600 may be formed as a sealing film 610 that discharges the air inside the housing 100 to the outside of the negative pressure room. The outer periphery of the sealing film 610 is sealed, and both ends are open, forming a passage that guides the air flow by the blowing fan 300 to the outside of the negative pressure room.

As shown in FIG. 9, the discharge film 600 has one end coupled with the discharge portion 200 open, the other end closed to prevent air from being discharged, and a discharge hole 621 along the outer periphery. It may also be formed as a perforated membrane 620.

The permeable membrane 620 of the negative pressure machine of the present invention is an exhaust membrane 600 that is inserted when using the negative pressure device as an air purifier to keep the indoor air clean, rather than to maintain the indoor space in a negative pressure state.

As air flows into the housing 100 through the inlet 118, it is purified by the filter 500, and is discharged back into the room through the discharge aperture 621 of the aperture membrane 620, thereby purifying the indoor air. It can be purified using the filter 500.

Therefore, the negative pressure device of the present invention can be used in a variety of ways by selecting the discharge membrane 600 as a sealing membrane 610 or a perforated membrane 620 and mounting it on the discharge unit 200, providing excellent installation convenience and versatility. This increases.

An embodiment of the low-noise negative pressure machine of the present invention will be described to explain the flow of noise reduction and maintenance work for reuse.

The negative pressure machine of the present invention is provided with a filter 500 and a blowing fan 300 inside a housing 100 consisting of a first body 110 and a second body 120.

The blowing fan 300 is operated and air is sucked into the housing 100 through the inlet 118 of the housing 100, passing through the filter 500, and blowing fan 300 through the inlet 116. ), and is again discharged to the outside of the housing 100 through the discharge portion 200 and the discharge membrane 600.

When discharged to the discharge unit 200, it moves along the slope formed by the discharge unit 200 and quickly flows outdoors without loss of fluidity.

When the blower motor 310 rotates and the blower fan 300 operates, the air flow is formed in the direction from the inlet 118 to the outlet 200, generating noise from the blower fan 300.

The noise of the blower fan 300 is reduced by an absorbing material surrounding the blower fan 300 and disposed inside the blower guide part 400, and passes through the suction port 116 and the filter 500. It is emitted to the outside of the housing 100 with its intensity weakened further.

In addition, the coupling protrusion 111 is inserted into the coupling groove 121 at the joint portion of the first body 110 and the second body 120, thereby forming a stepped soundproof wall.

When the noise of the blowing fan 300, which is reduced by the sound absorbing material 430, is emitted to the outside of the housing 100, the intensity is further weakened as it hits the stepped and curved soundproofing wall. In addition, even if it passes over the soundproof wall, the joints are sealed by the sealing film 130, so noise is further reduced.

When performing maintenance work to reuse the negative pressure machine of the present invention, either the first body 110 or the second body 120 is separated and the inside of the housing 100 is opened.

The blowing fan 300 and the blowing guide part 400 are pulled out into the open housing 100 and cleaned through disinfection and cleaning.

Since the blower fan 300 and the blower guide part 400 are relatively heavy and expensive, it is preferable to clean and disinfect them rather than replace them.

Since the filter 500 can be separated through the inlet 118 of the housing 100, the housing 100 may not be opened to detach the filter 500.

It is desirable to replace the filter 500 with a new part for hygiene reasons.

The housing 100, which consists of the first body 110 and the second body 120, is made of a foamed styrene resin material, so it is light in weight and convenient to handle. It is economically inexpensive and can be easily manufactured without burden. there is. In addition, the material is elastic, so it has excellent adhesion for convenient installation of the blower fan 300, filter 500, and blower guide part 400, and the coupling protrusion 111 and the coupling groove 121 are tightly coupled. You can.

The housing 100 can be reused, but if the exterior is damaged or damaged, one or more of the first body 110 and the second body 120 can be replaced. In addition, in order to dispose of one or more of the housings, it is easy to crush them due to the material characteristics of the housing.

The housing 100 is made of an inexpensive and economical foamed styrene resin material, can be mass-produced, and is light in weight.

In the low-noise negative pressure machine according to the present invention, the sound absorbing material 430, the soundproof wall formed by the coupling protrusion 111 and the coupling groove 121, and the filter 500 surround the blowing fan 300, so that the noise generated from the blowing fan 300 is reduced. There is an advantage in being able to reduce .

In addition, since it is separately composed of the first body 110 and the second body 120, the inside of the housing 100 can be easily opened, so maintenance work on the filter 500, blower fan 300, and blower guide unit 400 can be performed. Since it can be easily performed and reused, it can contribute to the immediate expansion of negative pressure rooms even if an infectious disease outbreak occurs and the number of infected people increases rapidly.

100:Housing
110: First body 111: Coupling protrusion 112: Filter receiving groove 112a: Packing
113: Separation part 114: Guide receiving groove 115: Blowing surface 116: Inlet
117: Discharge receiving groove 118: Inlet portion
120: Second body 121: Coupling groove 122: Motor receiving groove 123: Cable groove
124: Bracket receiving groove
130: Sealing film
200: Discharge portion 210: Internal contact surface 220: Step protrusion surface
300: Blowing fan 310: Blowing fan 320: Controller 321: Power cable 330: Back plate
400: Blower guide part 410: Open side 420: Coupling bracket 430: Sound absorbing material
500:Filter
600: Discharge membrane 610: Sealing membrane 620: Perforation membrane 621: Discharge aperture 630: Fixed spring

Claims (8)

The interior is hollow, and an inlet 118 through which indoor air flows is formed, and is provided separately into a first body 110 and a second body 120. Housing (100) whose hollow interior is opened by opening any one of (120);
A discharge part 200 coupled to the housing 100 and discharging to the outside of the housing 100;
A sealing film ( 130);
A blowing fan 300 provided inside the housing 100 and forming an air flow from the inlet 118 to the outlet 200;
A filter 500 that is inserted from the outside to the inside of the first body 110 and is exposed at the rear end of the inlet 118;
A discharge film 600, one end of which is inserted into the interior of the discharge unit 200 to form a passage for the air discharged from the discharge unit 200.
Low noise negative pressure machine.
According to paragraph 1,
A coupling protrusion 111 and a coupling groove 121 are formed at the joint portion of the first body 110 and the second body 120 and engage with each other,
As the coupling protrusion 111 is inserted into the coupling groove 121, a stepped soundproof wall is formed at the joint of the first body 110 and the second body 120.
Low noise negative pressure machine.
According to paragraph 1,
In the first body 110,
a filter receiving groove 112 exposed to the outside of the housing 100 and accommodating the filter 500;
A guide receiving groove 114 in which an intake port 116 through which air passing through the filter 500 is sucked in by the blowing fan 300 is formed in the central portion; and
The filter receiving groove 112 and the inlet 116 are spaced apart from each other, and a spacer 113 that guides the air passing through the filter 500 to the inlet 116 is further formed.
Low noise negative pressure machine.
According to paragraph 1,
A blowing guide unit disposed inside the housing 100 to surround the blowing fan 300 and guiding the wind power of the blowing fan 300 to an open surface 410 open in communication with the discharge part 200. It further includes (400);
A sound-absorbing material 430 surrounding the blowing fan 300 is disposed on the inner surface of the blowing guide part 400, excluding the open surface 410.
Low noise negative pressure machine.
According to paragraph 1,
The discharge portion 200 inclined in one direction is fitted into the discharge portion receiving groove 117 formed in the housing 100,
As the discharge unit 200 rotates in the circumferential direction in the discharge unit receiving groove 117, the air discharge direction induced by the discharge unit 200 is variable.
Low noise negative pressure machine.
According to paragraph 4,
A coupling bracket 420 for fixing the blowing guide part 400 is provided on the outer surface of the blowing guide part 400,
The coupling bracket 420 is detachably inserted and fixed into the bracket receiving groove 124 formed inside the housing 100 to support the blowing guide unit 400 inside the housing 100.
Low noise negative pressure machine.
According to paragraph 1,
The discharge portion 200 has an inner close contact surface 210 of a certain diameter and a stepped protrusion surface 220 of a smaller diameter than the inner close contact surface 210 formed at the end,
A fixing spring 630 is further provided on the inner surface of the discharge film 600 and brings the discharge film 600 into close contact with the inner contact surface 210 by elastic force,
The discharge film 600 of the portion in close contact with the inner contact surface 210 by the fixing spring 630 is formed with a diameter larger than the diameter of the stepped protrusion surface 220.
Low noise negative pressure machine.
According to paragraph 1,
The discharge film 600 is
A perforated membrane 620 through which the air cleaned by the filter 500 and discharged to the discharge unit 200 is discharged into the room through the discharge through hole 621 formed on the outer periphery of the discharge membrane 600. formed
Low noise negative pressure machine.