Steam filter cover and steam-using apparatus having a steam filter cover

Abstract

To provide: a vapor filter cover capable of suppressing passing sound made when vapor passes through a vapor filter; and a vapor using device having the vapor filter cover.SOLUTION: When vapor jetted from a distal end portion of an introduction pipe 14 passes through a mesh filter 4, a passing sound may be generated. To suppress the passing sound, a silencing cover 2 is attached to the mesh filter 4. A large number of silencing holes 25 are formed in a cylindrical body 20 of the silencing cover 2, and each silencing hole 25 is provided with an inclined surface whose inner diameter gradually reduces from an inner peripheral surface to an outer peripheral surface of the cylindrical body 20. This results in that the passing sound is reflected and diffused by the inclined surface, causing friction to be generated between the inclined surface and an inner surface of the silencing holes, which friction converts sound energy of the passing sound into thermal energy, thereby weakening vibration of the passing sound. In this way, the passing sound is reduced, and the passing sound made when the vapor passes through the mesh filter 4 can be suppressed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The steam filter cover according to the present application and the steam using device having the steam filter cover relate to a technology regarding the configuration of a steam filter cover attached to a steam filter for filtering steam.

Background Art

[0002] Steam may be used as a heat source for various devices, etc. Generally, foreign substances such as fine dust are mixed in steam. For this reason, a filter is provided in the steam transfer path and allowed to pass through, and the steam is filtered by this filter to capture foreign substances in many cases.

[0003] As a device provided with such a steam filter, there is a gas-liquid separator disclosed in Patent Document 1 below. This gas-liquid separator is a device for separating a liquid such as moisture from a gas such as steam. The gas flowing in from the inlet 6 swirls along the swirling blades 12, and the liquid is swung outward by the action of the centrifugal force at that time and separated. The gas from which the liquid has been removed flows out from the outlet 5.

[0004] In this way, the gas passes through this gas-liquid separator, but an upstream filter 24 and a filter 22 are provided in the gas flow path in the gas-liquid separator. The gas is filtered by passing it through the upstream filter 24 and the filter 22, and foreign substances contained in the gas are captured.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the technology disclosed in the aforementioned Patent Document 1, a passing noise may be generated when the gas passes through the filter. This passing noise is particularly common when a mesh-like metal filter is used. Furthermore, in the case of a cylindrical filter, for example, when the gas passes from the inside to the outside, a louder passing noise is generated to the outside.

[0007] Such passing noises can, under certain conditions, cause noise problems. Furthermore, various pieces of equipment installed in the steam transfer path often produce abnormal noises due to malfunctions or deterioration of parts. Therefore, if passing noise occurs when the steam passes through the filter, there is a risk that the equipment may be mistakenly perceived as malfunctioning, even though it is functioning normally.

[0008] Therefore, the present invention aims to provide a steam filter cover and a steam usage device having a steam filter cover that can suppress the noise of steam passing through the steam filter. [Means for solving the problem]

[0009] The steam filter cover relating to this application is A steam filter cover that is attached to a mesh metal steam filter for filtering steam, A cover body having an inner surface facing the steam filter and an outer surface that is the back side of the inner surface, A through hole that connects the inner surface and the outer surface of the cover body, through which steam passes from the inner surface to the outer surface, wherein a sound-absorbing inclined surface that gradually narrows in size from the inner surface to the outer surface is formed on the inner surface of the through hole. It is characterized by having the following features.

[0010] The steam-using apparatus having a steam filter cover according to the present application is: Inlet passage through which steam flows in, A mesh metal steam filter that filters the steam flowing in through the aforementioned inlet passage, A steam filter cover attached to the aforementioned steam filter, wherein the steam filter cover is A cover body having an inner surface facing the steam filter and an outer surface that is the back side of the inner surface, The cover body has a through hole that connects the inner surface and the outer surface, through which steam passes from the inner surface to the outer surface, and the through hole has a sound-absorbing inclined surface formed on its inner surface that gradually narrows in size from the inner surface to the outer surface. It is characterized by the following: [Effects of the Invention]

[0011] In the steam filter cover and steam-using apparatus having the steam filter cover according to the present invention, the steam filter cover has a through-hole formed in it that connects the inner surface and the outer surface of the cover body, allowing steam to pass from the inner surface to the outer surface. Furthermore, a sound-absorbing inclined surface is formed on the inner surface of this through-hole, which gradually narrows in size from the inner surface to the outer surface.

[0012] Therefore, if steam passing through the steam filter generates noise, this noise enters the through-hole along with the steam and diffuses on the sound-absorbing inclined surface. The vibrational energy of the noise is converted into thermal energy, weakening the vibrations of the noise. Consequently, the noise generated when steam passes through the steam filter can be suppressed. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram showing the overall configuration of a heating device 1 equipped with a sound-dampening cover 2, which is a first embodiment of the steam filter cover and steam-using device having the steam filter cover according to the present application. [Figure 2] Figure 1 is an enlarged partial cross-sectional view of the vicinity of the sound-absorbing cover 2 shown. [Figure 3] Figure 2 is an enlarged cross-sectional view showing the sound-absorbing holes 25 formed in the sound-absorbing cover 2 shown in Figure 2. [Figure 4]This is an enlarged partial cross-sectional view near the soundproof cover 202 in the second embodiment of the steam filter cover and the steam-using device having the steam filter cover according to the present application.

Mode for Carrying Out the Invention

[0014] [Term Explanation in the Embodiment] The main terms shown in the embodiment respectively correspond to the following elements of the steam filter cover and the steam-using device having the steam filter cover according to the present application.

[0015] Heating device 1... Steam-using device Soundproof covers 2, 202... Steam filter cover Mesh filter 4... Steam filter Introduction pipe 14... Inflow path Cylindrical bodies 20, 220... Cover body Inner peripheral surface 20a... Inner side surface Outer peripheral surface 20b... Outer side surface Soundproof holes 25, 225... Through holes Inner surface of soundproof hole 25a... Inner surface of through hole Inclined surface 25b... Soundproof inclined surface Gap between the outer peripheral surface of the mesh filter 4 and the inner peripheral surfaces of the cylindrical bodies 20, 220... Diffusion space Rubber, urethane sponge, glass wool, etc... Elastic member

[0016] [First Embodiment] The first embodiment of the steam filter cover and the steam-using device having the steam filter cover according to the present application will be described by taking the configuration of the heating device 1 as an example. The heating device 1 is a device that heat-treats an object to be heated 50 such as foodstuffs accommodated in the device main body 10 with steam (see FIG. 1).

[0017] The space inside the main body 10 of the heating device 1 is configured as a heating chamber 12. A cylindrical inlet pipe 14 is attached to the top of the main body 10, facing the heating chamber 12. Steam generated by a steam generator such as a boiler is transported through this inlet pipe 14 and introduced into the heating chamber 12 along the direction of arrow 91. As shown in Figure 2, the tip of the inlet pipe 14 is sealed by a bolt 15, but an outlet (not shown) is provided on the cylindrical surface of the tip, and steam is injected into the heating chamber 12 from this outlet.

[0018] As shown in Figure 2, a cylindrical mesh filter 4 is attached to the tip of the inlet pipe 14, covering the outlet, and steam is ejected after passing through this mesh filter 4. The center of the mesh filter 4 is positioned to coincide with the center line L1 (Figure 2) of the inlet pipe 14. In this embodiment, the mesh filter 4 is made of a metal material and has a mesh-like structure throughout.

[0019] The steam transported through the inlet pipe 14 may contain foreign matter such as dust. The steam is filtered by passing through the mesh filter 4, and the foreign matter is captured by the mesh portion of the mesh filter 4. The mesh filter 4 is detachable from the tip of the inlet pipe 14, and during maintenance work, the mesh filter 4 is removed from the inlet pipe 14, and any foreign matter attached to the mesh filter 4 is removed during cleaning.

[0020] Here, a passing noise may occur when steam passes through the mesh filter 4. This is due to a complex interplay of factors such as the material and shape of the mesh filter 4, but when steam passes through the mesh filter 4 with force, turbulence is generated, and this is the main cause of the passing noise.

[0021] Such passing noises can cause noise problems. Also, if the heating device 1 malfunctions or its parts deteriorate, abnormal noises are often generated as a result. Therefore, if a passing noise occurs when steam passes through the mesh filter 4, the heating device 1 may be mistakenly perceived as malfunctioning even though it is functioning normally.

[0022] Therefore, in order to suppress such passing noise, in this embodiment, a cylindrical sound-absorbing cover 2 is provided to cover the mesh filter 4. This sound-absorbing cover 2 is held in close proximity to the mesh filter 4, and a small gap is formed between the outer surface of the mesh filter 4 and the inner surface of the sound-absorbing cover 2. The center of the sound-absorbing cover 2 is positioned to coincide with the center line L1 (Figure 2) of the introduction pipe 14.

[0023] In this embodiment, the sound-dampening cover 2 is constructed using rubber as an elastic material. The sound-dampening cover 2 is detachably held to the tip of the introduction pipe 14 by fitting of protrusions and recesses or by fixing means such as fasteners (not shown). In Figure 2, only the sound-dampening cover 2 is shown as a cross-sectional view, while the other parts are shown as side views.

[0024] The sound-absorbing cover 2 comprises a cylindrical body 20, and as shown in Figure 1, numerous sound-absorbing holes 25 are formed throughout this cylindrical body 20. Each sound-absorbing hole 25 is circular in shape and penetrates through the inner circumferential surface 20a and the outer circumferential surface 20b of the cylindrical body 20, as shown in Figure 3. The inner circumferential surface 20a of the cylindrical body 20 is the surface that is in close proximity to and opposite the outer circumferential surface of the mesh filter 4, and the outer circumferential surface 20b is the back surface of the inner circumferential surface 20a. The through-center line L2 (Figure 3) of each sound-absorbing hole 25 is formed to be perpendicular to the center line L1 (Figure 2) of the introduction pipe 14.

[0025] The inner surface 25a of each sound-dampening hole 25 is composed of a continuously formed cylindrical surface 25c and an inclined surface 25b. The inner diameter of the cylindrical surface 25c is constant along the through-center line L2, while the inclined surface 25b is inclined such that its inner diameter gradually decreases from the inner circumferential surface 20a to the outer circumferential surface 20b of the cylindrical body 20. In this embodiment, the inclination angle k of the inclined surface 25b with respect to the cylindrical surface 25c is less than 45 degrees, specifically about 40 degrees.

[0026] Since the inner surface 25a of each sound-absorbing hole 25 is equipped with an inclined surface 25b, when the sound generated when steam passes through the mesh filter 4 enters the sound-absorbing hole 25, the sound is reflected and diffused by the inclined surface 25b, causing friction between it and the inner surface 25a of the sound-absorbing hole. This friction converts the sound energy of the passing sound into thermal energy, weakening the vibrations of the passing sound. Therefore, the passing sound is reduced, and the sound of steam passing through the mesh filter 4 can be suppressed.

[0027] Furthermore, in this embodiment, since the sound-absorbing cover 2 is made of rubber, the vibration of the rubber material also converts the sound energy of the sound passing through the mesh filter 4 into vibrational energy or thermal energy, thereby weakening the vibration of the sound passing through. As a result, the sound passing through becomes even quieter, and the sound of steam passing through the mesh filter 4 can be further suppressed.

[0028] Furthermore, in this embodiment, a small gap is formed between the outer surface of the mesh filter 4 and the inner surface of the sound-absorbing cover 2. As a result, the sound passing through the mesh filter 4 is diffused by diffuse reflection within this gap. The friction during this diffusion converts the sound energy of the passing sound into thermal energy, weakening the vibrations of the passing sound. Therefore, the passing sound becomes even quieter, further suppressing the sound of steam passing through the mesh filter 4.

[0029] [Second Embodiment] A second embodiment of the steam filter cover and steam-using device having the steam filter cover according to the present invention will be described with reference to Figure 4. The sound-absorbing cover 202 according to this embodiment is attached to cover the mesh filter 4 provided at the tip of the inlet pipe 14, similar to the sound-absorbing cover 2 in the first embodiment described above. The operation of the heating device 1 and the configuration and function of the inlet pipe 14 and mesh filter 4 are the same as in the first embodiment described above, so their explanation will be omitted. In Figure 4, only the sound-absorbing cover 202 is shown as a cross-sectional view, while the other parts are shown as side views.

[0030] The sound-absorbing cover 202 according to this embodiment also has a cylindrical shape and is made of rubber material. The inner diameter of the upper end (or both ends) of the sound-absorbing cover 202 is set to be the same length as the inner diameter of the sound-absorbing cover 2 in the first embodiment. However, the sound-absorbing cover 202 according to this embodiment is designed with a material and thickness that expands in response to the pressure of the steam flowing into the introduction pipe 14. In other words, the sound-absorbing cover 202 according to this embodiment is configured to bulge outwards towards the center when in use, as shown in Figure 4. This bulge ensures a wider gap length L20 in the inner diameter direction between the inner circumferential surface of the sound-absorbing cover 202 and the outer circumferential surface of the mesh filter 4.

[0031] Furthermore, the cylindrical body 220 of the sound-dampening cover 202 has a number of sound-dampening holes 225 formed therein, similar to the sound-dampening cover 2 in the first embodiment. The configuration of the sound-dampening holes 225 is the same as that of the sound-dampening cover 2. That is, the sound-dampening holes 225 are circular in shape and penetrate through the cylindrical body 220 so as to connect the inner and outer circumferential surfaces. The through-center line of each sound-dampening hole 225 is formed to be perpendicular to the center line L1 (Figure 2) of the introduction pipe 14.

[0032] Furthermore, the inner surface of each sound-dampening hole 225 is composed of a continuously formed cylindrical surface and an inclined surface. The cylindrical surface has a constant inner diameter along the through-center line, while the inclined surface is sloped such that its inner diameter gradually decreases from the inner circumferential surface to the outer circumferential surface of the cylindrical body 220.

[0033] Therefore, similar to the first embodiment described above, when the sound generated as steam passes through the mesh filter 4 enters the sound-dampening hole 225, the sound is reflected and diffused by the inclined surface, thereby suppressing the sound. Furthermore, since the sound-dampening cover 202 is made of rubber, the sound is further suppressed by vibrations based on the shaking of the rubber material itself under steam pressure.

[0034] Furthermore, in this embodiment, since the gap length L20 between the outer surface of the mesh filter 4 and the inner surface of the sound-absorbing cover 202 is wider, the sound passing through the mesh filter 4 is diffused by diffuse reflection over a wider area. As a result, the friction during diffusion increases, the amount of sound energy converted from the passing sound to thermal energy increases, the vibration of the passing sound is sufficiently weakened, and the passing sound can be suppressed more reliably.

[0035] Furthermore, since the inner diameter of the upper end (or both ends) of the sound-absorbing cover 202 in this embodiment is configured to be the same length as the sound-absorbing cover 2 in the first embodiment, it is possible to attach the sound-absorbing cover 202 to the introduction pipe 14 having the dimensions shown in the first embodiment. Therefore, the sound-absorbing cover 2 of the first embodiment and the sound-absorbing cover 202 of this embodiment can be easily exchanged, thereby increasing the versatility of the sound-absorbing cover.

[0036] [Other embodiments] In the embodiments described above, a heating device 1 was given as an example of a steam-using device, but the invention is not limited to this. Any device equipped with a steam filter for filtering the introduced steam can be fitted with the steam filter cover with through holes as described in this invention, as long as it has a different configuration and function.

[0037] Furthermore, although a mesh filter 4 was exemplified as a steam filter in the above embodiment, other shapes and structures of steam filters made of mesh metal may be used. For example, a steam filter with a shape different from a cylindrical shape can be adopted.

[0038] Furthermore, although the above-described embodiment exemplified a sound-absorbing cover 2 as a steam filter cover, other shapes and structures of steam filter covers may be used as long as they have through holes with sound-absorbing inclined surfaces formed on the inner surface of the through holes. For example, a steam filter cover with a shape different from a cylindrical shape, such as a planar shape, can be adopted, having a shape that corresponds to the shape of the steam filter to be installed.

[0039] Furthermore, while numerous sound-dampening holes 25 formed in the cylindrical body 20 were exemplified as through-holes, more or fewer sound-dampening holes 25 may be formed than the number exemplified. In addition, while an inclined surface 25b with an inclination angle k of approximately 40 degrees was exemplified as a sound-dampening inclined surface, other angles less than 45 degrees or angles of 45 degrees or more may also be adopted.

[0040] Furthermore, although the above-described embodiment showed an example in which the sound-absorbing cover 2 is made of rubber material, the steam filter cover can also be made of an elastic material other than rubber, such as urethane sponge or glass wool. In addition, materials other than elastic materials, such as resin materials or metal materials, can be used as the material for the steam filter cover. [Explanation of Symbols]

[0041] 1: Heating device 2, 202: Sound-dampening cover 4: Mesh filter 14: Inlet tube 20, 220: Cylindrical body 20a: Inner surface 20b: Outer surface 25, 225: Sound-dampening holes 25a: Inner surface of sound deadening hole 25b: Inclined surface

Claims

[Claim 1] Inlet passage through which steam flows in, A mesh metal steam filter that filters the steam flowing in through the aforementioned inlet passage, A steam filter cover attached to the aforementioned steam filter, wherein the steam filter cover is A cover body having an inner surface facing the steam filter and an outer surface that is the back side of the inner surface, The cover body has a through hole that connects the inner surface and the outer surface, through which steam passes from the inner surface to the outer surface, and the through hole has a sound-absorbing inclined surface formed on its inner surface that gradually narrows in size from the inner surface to the outer surface. A steam-using apparatus having a steam filter cover characterized by the following features.

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