A fan coil unit noise-reducing return air maintenance box with serviceable valves and its application method

Abstract

This invention provides a noise-reducing return air maintenance box for fan coil units, allowing for the maintenance of fan coil unit motors and water pipe valves within the ceiling. It includes a rectangular metal outer shell containing a cavity comprising a connecting section, an inspection section, and a connecting pipe section. The connecting section connects to the fan coil unit via stainless steel hinges; the connecting pipe section connects to ordinary air ducts. Sound-absorbing cotton is laid on the cavity for insulation and noise reduction. Inspection ports are located on the side walls and bottom of the inspection section, each equipped with a movable inspection door. The opening direction of the movable inspection door is away from the fan coil unit motor and water pipe valves. This design improves the comfort of personnel during maintenance of the fan coil unit motor and fan coil unit. The invention utilizes a folding double-leaf door, saving space when opening into the cavity. It can be used alone or in combination to achieve maintenance functions, facilitating operation and repair by maintenance personnel.

Description

Technical Field

[0001] This invention relates to the technical field of return air maintenance boxes, and more particularly to a fan coil unit noise-reducing return air maintenance box with functions for maintenance of the coil motor and water valve, noise reduction, and easy-to-open operation. Background Technology

[0002] Fan coil units are equipped with motors, and air conditioning water pipes and valves need to be connected to the coils. All these components require maintenance, necessitating the installation of access panels in the ceiling. A conventional installation would require a water valve access panel at the coil location and a motor access panel at the coil's return air section. Having two access panels in such close proximity negatively impacts the aesthetics of the ceiling.

[0003] When fan coil units are running, they inevitably generate motor noise and wind noise. The noise is transmitted to the outside through the pipes, affecting the comfort of residents and causing a decline in the quality of the living environment.

[0004] Existing ductwork access control solutions typically use a single access panel that is closed with a latch. Due to limited ceiling space, the access panel is very difficult to open, hindering personnel operations and affecting the work efficiency of maintenance staff.

[0005] Patent document CN106766073A provides a return air maintenance box for a fan coil unit, which is fitted onto the fan of the fan coil unit. The return air maintenance box has an inspection door on one side to provide a passage for the maintenance of the fan coil unit.

[0006] Patent document CN212081443U provides a fan coil unit return air box with an easily detachable filter, including a box body and a surface cooling section installed in the box body; it also includes fixing plates, a filter, and springs; the box body is a hexahedral structure with missing sides, including a top plate, a bottom plate, a right side plate, a front end plate, and a rear end plate; there are two sets of fixing plates, respectively arranged on the inner sides of the top plate and the bottom plate, near the left side of the box body; each set of fixing plates is spaced apart along the longitudinal direction; the filter is arranged longitudinally between the top plate and the bottom plate, corresponding to the position of the fixing plates; vertical rubber pads are arranged longitudinally at intervals on the inner side of the filter, and the rubber pads are connected to the fixing plates; vertical springs are arranged longitudinally at intervals on the outer side of the filter, and the upper end of the spring is detachably connected to the top plate, and the lower end of the spring is detachably connected to the bottom plate.

[0007] Patent document CN215570975U provides a return air box system that integrates return air filtration and ceiling-mounted maintenance functions. The return air box has a top-to-bottom through-hole structure. The lower maintenance port also functions as a return air vent, while the upper maintenance port allows personnel to perform standing maintenance operations through the return air vent. Summary of the Invention

[0008] The purpose of this invention is to provide a coil return air box that is noise-absorbing, easy to operate, and integrates motor maintenance and water valve maintenance.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A ventilated return air maintenance box for fan coil units, used for servicing the motors and water pipe valves of fan coil units within a suspended ceiling, includes a rectangular metal outer shell. The outer shell contains a cavity comprising a connecting section, a maintenance section, and a connecting pipe section. The connecting section is connected to the fan coil unit via stainless steel hinges. The connecting pipe section is connected to a standard air duct. The cavity is lined with sound-absorbing cotton for insulation and noise reduction. The maintenance section has maintenance ports on its side walls and bottom, each equipped with a movable maintenance door. The opening direction of the movable maintenance door is away from the fan coil unit motor and water pipe valves. This box is used for servicing the fan coil unit motor and water pipe valves.

[0011] Preferably, the height of the inspection section inside the cavity is not less than 550mm, and the width of the movable inspection door is less than the height of the cavity.

[0012] Preferably, the movable maintenance door includes a side maintenance door and a lower maintenance door. The side maintenance door is located on the maintenance opening on the side wall of the maintenance section; the lower maintenance door is located on the maintenance opening at the bottom of the maintenance section; both the side maintenance door and the lower maintenance door are double-leaf folding doors, which are used to push the side maintenance door and the lower maintenance door open from the outside into the cavity and then fold them up.

[0013] Preferably, the double-leaf folding door includes two leaves connected by a central hinge. One side of the double-leaf folding door is magnetically connected to the metal shell along the edge of the access panel via a magnetic buckle. The other side of the double-leaf folding door is movably connected to the corresponding metal shell along the edge of the access panel via a side hinge. The double-leaf folding door is folded with the central hinge and rotated into the cavity with the metal shell connected by the side hinge as the axis.

[0014] Preferably, the double-leaf folding door is provided with door handles on both sides, so that it can be opened from both sides, and the door handles are located on the double-leaf folding door near the magnetic buckle.

[0015] Preferably, both the movable access door and the metal casing are made of galvanized steel sheet, and the movable access door and the metal casing are respectively fixed to the sound-absorbing cotton with glue.

[0016] Preferably, a detachable multi-layer filter screen is provided between the connecting section and the maintenance section, and the multi-layer filter screen is located on one side of the fan coil motor.

[0017] Preferably, the multi-layer filter screen is disposed between the connecting section and the maintenance section via a detachable structure;

[0018] The detachable structure includes two sets of U-shaped slots composed of aluminum alloy strips and aluminum alloy frames. The U-shaped slots are fastened to the cavity by fasteners. The two ends of the multi-layer filter screen are vertically and detachably arranged in the two sets of U-shaped slots.

[0019] Preferably, the sound-absorbing cotton is melamine sound-absorbing cotton, and the thickness of the sound-absorbing cotton in the cavity is 10cm to 40cm.

[0020] The present invention also provides an application method for a fan coil unit silencer return air maintenance box with serviceable valves, comprising the following:

[0021] When the fan coil motor inside the ceiling requires regular maintenance:

[0022] First, push the lower inspection door inward. The magnetic door latch connected to one side of the double folding door of the lower inspection door will open. The double folding door will be folded by the middle hinge. The folding direction will be away from the fan coil motor, so as not to obstruct the maintenance personnel from inspecting the fan coil motor.

[0023] When closed, the double-leaf folding door can be pulled outwards directly to close it; the magnetic door latch on one side of the lower access door is magnetically connected to the metal shell on the edge of the access opening.

[0024] When the fan coil unit, water pipe, and valves inside the ceiling require regular maintenance:

[0025] First, push the lower inspection door inward. Maintenance personnel can climb the ladder and stand to enter the cavity. They can then pull the side inspection door inward using the handle. The magnetic door latch on one side of the side inspection door will disengage from the metal shell along the edge of the inspection opening, thus opening the side inspection door.

[0026] The double-leaf folding door of the side access door folds with a central hinge, with the folding direction away from the motor, so as not to obstruct the personnel's view and to facilitate simultaneous inspection of the status of the fan coil unit motor and the fan coil unit water pipe valves. The space inside the access section of the cavity allows maintenance personnel to pass through the side access port, facilitating water valve maintenance and repair. The side access door can be pushed open and closed directly from the inside out. A magnetic door latch on one side of the side access door is magnetically connected to the metal shell along the edge of the access port to close the side access door.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] (1) The present invention uses melamine sound-absorbing cotton, which has significant heat preservation and sound absorption functions, reduces equipment noise transmitted to the outside through the air duct, and improves the living comfort of people.

[0029] (2) The present invention saves the area to be opened into the cavity by using two foldable double folding doors. They can be used alone or in combination to achieve the inspection function, making it convenient for maintenance personnel to operate and maintain.

[0030] (3) The present invention connects one side of the double folding door with magnetic attraction, which can easily open the double folding door, saving workers the tedious operation of opening it, saving maintenance time and improving efficiency.

[0031] (4) The present invention improves the convenience of use and maintenance of the filter screen by setting a detachable multi-layer filter screen inside the return air maintenance box. The multi-layer filter screen achieves the filtration of return air, reduces the possibility of damage to the fan coil motor caused by dust, and improves the cleanliness of the indoor environment.

[0032] (5) The present invention is simple to operate and no additional water valve inspection port is required. Only a ceiling inspection port needs to be set at the bottom of the fan coil return air box when decorating the ceiling, thereby indirectly improving the aesthetics of the ceiling. Attached Figure Description

[0033] Figure 1 A front sectional view of a fan coil unit silencer return air maintenance box with an inspectable valve, provided as an embodiment of the present invention;

[0034] Figure 2 A bottom view of a fan coil unit silencer return air maintenance box with a serviceable valve, provided as an embodiment of the present invention.

[0035] The serial numbers in the diagram are as follows:

[0036] 1. Bottom access door; 2. Stainless steel hinges; 3. Melamine sound-absorbing cotton; 4. Side access door; 5. Metal casing; 6. Aluminum alloy profile; 7. Aluminum alloy frame; 8. Door handle; 9. Multi-layer filter screen; 10. Stainless steel hinges; 11. Magnetic door latch; 12. Double folding door. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Figure 1 This is a schematic diagram of the left side of a fan coil unit silencer return air maintenance box with a serviceable valve, provided as an embodiment of the present invention.

[0039] like Figure 1 As shown, this invention discloses a fan coil unit silencer return air maintenance box for maintenance of valves, used for maintenance of fan coil unit motors and fan coil unit water pipe valves in the ceiling. It includes a rectangular metal shell 5, with a cavity inside the metal shell 5. The cavity includes a connecting section 200, a maintenance section 100, and a connecting pipe section 300. The connecting section is connected to the fan coil unit through a stainless steel hinge 10. The connecting pipe section 300 is connected to a regular air duct.

[0040] The cavity is lined with sound-absorbing cotton 3 for heat preservation and sound absorption; the side walls and bottom of the maintenance section 100 are respectively provided with maintenance ports, and each maintenance port is equipped with a movable maintenance door. The opening direction of the movable maintenance door is away from the fan coil motor and fan coil water pipe valve; it is used for maintenance of the fan coil motor and fan coil water pipe valve.

[0041] Furthermore, in this embodiment, the sound-absorbing cotton 3 is melamine sound-absorbing cotton, and the thickness of the sound-absorbing cotton 3 in the cavity is 10cm~40cm.

[0042] The movable maintenance door includes a side maintenance door 4 and a lower maintenance door 1. The side maintenance door 4 is located on the maintenance opening on the side wall of the maintenance section 100; the lower maintenance door 1 is located on the maintenance opening at the bottom of the maintenance section 100. Both the side maintenance door 4 and the lower maintenance door 1 are double-leaf folding doors 12, which are used to push the side maintenance door 4 and the lower maintenance door 1 from the outside into the cavity and then fold them up.

[0043] In this embodiment, the double-leaf folding door 12 includes two doors connected by a middle hinge. One side of the double-leaf folding door 12 is magnetically connected to the metal shell 5 along the edge of the access panel via a magnetic buckle 11. The other side of the double-leaf folding door 12 is movably connected to the corresponding metal shell 5 along the edge of the access panel via a side hinge. The double-leaf folding door 12 is folded with the middle hinge and rotated into the cavity with the metal shell 5 connected by the side hinge as the axis.

[0044] The side access door 4 and the lower access door 1 can be pushed open directly, with the pushing direction away from the coil motor, so as not to obstruct maintenance personnel from repairing the fan motor.

[0045] Furthermore, in this embodiment, the height of the maintenance section 100 inside the cavity is not less than 550mm, and the width of the movable maintenance door is less than the height of the cavity.

[0046] Furthermore, in this embodiment, the double-leaf folding door 12 is provided with door handles 8 on both sides, which can be opened from both sides. The door handles 8 are located on the double-leaf folding door 12 near the magnetic buckle 11.

[0047] Furthermore, in this embodiment, both the movable maintenance door and the metal shell 5 are made of galvanized steel sheet, and the movable maintenance door and the metal shell 5 are respectively fixed to the sound-absorbing cotton 3 with glue.

[0048] Furthermore, in this embodiment, a detachable multi-layer filter 9 is used between the connecting section 200 and the maintenance section 100. The multi-layer filter 9 is located on one side of the fan coil unit motor, which improves the convenience of use and maintenance of the filter. The multi-layer filter achieves filtration of return air, reducing the possibility of damage to the fan coil unit motor caused by dust and improving the cleanliness of the indoor environment. The detachable structure includes two sets of U-shaped slots composed of aluminum alloy strips 6 and aluminum alloy frames 7. The U-shaped slots are fastened to the cavity by fasteners. The two ends of the multi-layer filter 9 are vertically and detachably installed in the two sets of U-shaped slots.

[0049] Furthermore, in this embodiment, both the side hinges and the middle hinges are made of stainless steel 2.

[0050] The method for applying the maintenance-accessible valve-equipped fan coil unit silencer return air maintenance box of the present invention is as follows:

[0051] When the fan coil motor inside the ceiling requires regular maintenance:

[0052] First, push the lower inspection door 1 inward. The magnetic door buckle 11 connected to one side of the double folding door 12 of the lower inspection door 1 will open. The double folding door 12 will be folded by the middle hinge. The folding direction will be away from the fan coil motor, so as not to obstruct the maintenance personnel from operating the fan coil motor.

[0053] When closed, the door can be pulled outwards directly by the door handle 8 on the double folding door 12; the magnetic door buckle 11 on one side of the lower inspection door 1 is magnetically connected to the metal shell 5 on the edge of the inspection opening by magnetic attraction.

[0054] When the fan coil unit, water pipe, and valves inside the ceiling require regular maintenance:

[0055] First, push the lower inspection door 1 inward. The maintenance personnel can climb the ladder and stand to enter the cavity. They can then pull the side inspection door 4 directly inward using the door handle 8. The magnetic door buckle 11 on one side of the side inspection door 4 will disengage from the metal shell 5 on the edge of the inspection opening, thus opening the side inspection door 4.

[0056] The double-leaf folding door of the side inspection door 4 is folded by a central hinge, with the folding direction facing away from the motor, so as not to obstruct the personnel's view and to facilitate personnel to check the status of the fan coil motor and the fan coil water pipe valve at the same time; the space inside the inspection section 100 of the cavity allows the upper body of the maintenance personnel to pass through the side inspection port, which is convenient for water valve maintenance and repair. The side inspection door 4 can be pushed open and closed directly from the inside to the outside. The magnetic door buckle 11 on one side of the side inspection door 4 is magnetically connected to the metal shell 5 on the edge of the inspection port to close the side inspection door 4.

[0057] (1) This invention uses melamine-coated sound-absorbing cotton, which has significant heat preservation and sound absorption functions, reducing equipment noise transmission to the outside through the air duct and improving the comfort of living personnel. This invention uses two foldable double-leaf folding doors, saving the area that needs to be opened into the cavity. They can be used individually or in combination to achieve the maintenance function, making it convenient for maintenance personnel to operate and maintain. This invention uses a magnetic connection on one side of the double-leaf folding doors, which can be easily opened, saving workers the tedious operation of opening them, saving maintenance time and improving efficiency. This invention improves the convenience of use and maintenance of the filter screen by setting a detachable multi-layer filter screen inside the return air maintenance box. The multi-layer filter screen achieves filtration of return air, reducing the possibility of damage to the fan coil motor caused by dust and improving the cleanliness of the indoor environment. This invention is simple to operate and does not require an additional water valve maintenance port. Only a ceiling maintenance port needs to be set at the bottom of the fan coil return air box when decorating the ceiling, thereby indirectly improving the aesthetics of the ceiling.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for applying a maintenance-enabled fan coil unit silencer return air maintenance box, used for maintenance of the fan coil unit motor and fan coil unit water pipe valves within a suspended ceiling, characterized in that... The device includes a rectangular metal shell (5), inside which is a cavity. The cavity includes a connecting section (200), an inspection section (100), and a pipe section (300). The connecting section (200) is connected to the fan coil unit via a stainless steel hinge (10). The pipe section (300) is connected to a regular air duct. The cavity is covered with sound-absorbing cotton (3) for heat preservation and sound absorption; the side wall and bottom of the maintenance section (100) are respectively provided with maintenance ports, and each maintenance port is provided with a movable maintenance door. The opening direction of the movable maintenance door is away from the fan coil motor and the fan coil water pipe valve; used for maintenance of the fan coil motor and the fan coil water pipe valve. The steps include the following: When the fan coil motor inside the ceiling requires regular maintenance: First, push the lower inspection door (1) inward. The magnetic door buckle (11) connected to one side of the double folding door (12) of the lower inspection door (1) is opened. The double folding door (12) is folded by the middle hinge. The folding direction is away from the fan coil motor, so as not to hinder the maintenance personnel from operating the fan coil motor. When closed, the door can be directly pulled outward and closed by the door handle (8) on the double folding door (12); the magnetic door buckle (11) on one side of the lower inspection door (1) is magnetically connected to the metal shell (5) on the edge of the inspection port by magnetic attraction. When the fan coil unit, water pipe, and valves inside the ceiling require regular maintenance: First, the maintenance personnel push open the lower inspection door (1) inward, climb the ladder to stand and enter the cavity, and pull the side inspection door (4) directly inward through the door handle (8). The magnetic door buckle (11) on one side of the side inspection door (4) is demagnetized and disconnected from the metal shell (5) on the edge of the inspection port, so that the side inspection door (4) can be opened. The double-leaf folding door of the side inspection door (4) is folded by the middle hinge. The folding direction is away from the motor, so as not to obstruct the personnel's line of sight. It is convenient for personnel to check the status of the fan coil motor and the status of the fan coil water pipe valve at the same time. The space inside the inspection section (100) of the cavity allows the upper body of the maintenance personnel to pass through the side inspection port, which is convenient for water valve maintenance and upkeep. The side inspection door (4) can be pushed open and closed directly from the inside to the outside. The magnetic door buckle (11) on one side of the side inspection door (4) is magnetically connected to the metal shell (5) on the edge of the inspection port to realize the closing of the side inspection door (4).

2. The application method of the fan coil unit silencer return air maintenance box with serviceable valves according to claim 1, characterized in that, The height of the maintenance section (100) inside the cavity is not less than 550mm, and the width of the movable maintenance door is less than the height of the cavity.

3. The application method of the fan coil unit silencer return air maintenance box with serviceable valves according to claim 1, characterized in that, The movable maintenance door includes a side maintenance door (4) and a lower maintenance door (1). The side maintenance door (4) is located on the maintenance opening on the side wall of the maintenance section (100). The lower maintenance door (1) is located on the maintenance opening at the bottom of the maintenance section (100). Both the side maintenance door (4) and the lower maintenance door (1) are double-leaf folding doors (12), which are used to push the side maintenance door (4) and the lower maintenance door (1) from the outside into the cavity and then fold them up.

4. The application method of the fan coil unit silencer return air maintenance box with serviceable valves according to claim 3, characterized in that, The double-leaf folding door (12) includes two doors connected by a middle hinge. One side of the double-leaf folding door (12) is magnetically connected to the metal shell (5) on one side edge of the access port via a magnetic buckle (11). The other side of the double-leaf folding door (12) is movably connected to the corresponding metal shell (5) on the edge of the access port via a side hinge. The double-leaf folding door (12) is folded with the middle hinge and rotated into the cavity with the metal shell (5) connected by the side hinge as the axis.

5. The application method of the fan coil unit silencer return air maintenance box with serviceable valves according to claim 4, characterized in that, The double-leaf folding door (12) is provided with door handles (8) on both sides for opening from both sides. The door handles (8) are located on the double-leaf folding door (12) near the magnetic buckle (11).

6. The application method of the fan coil unit silencer return air maintenance box with serviceable valves according to claim 1, characterized in that, Both the movable maintenance door and the metal shell (5) are made of galvanized steel plate, and the movable maintenance door and the metal shell (5) are respectively fixed to the sound-absorbing cotton (3) with glue.

7. The application method of the fan coil unit silencer return air maintenance box with serviceable valves according to claim 1, characterized in that, A removable multi-layer filter screen (9) is provided between the connecting section (200) and the maintenance section (100), and the multi-layer filter screen (9) is located on one side of the fan coil motor.

8. The application method of the fan coil unit silencer return air maintenance box with serviceable valves according to claim 7, characterized in that, The multi-layer filter screen (9) is disposed between the connecting section (200) and the maintenance section (100) by means of a detachable structure; The detachable structure includes two sets of aluminum alloy strips (6) and aluminum alloy frame (7) combined into a U-shaped slot. The U-shaped slot is fastened to the cavity by fasteners. The two ends of the multi-layer filter screen (9) are vertically and detachably arranged in the two sets of the U-shaped slots.

9. The application method of the fan coil unit silencer return air maintenance box with serviceable valves according to claim 1, characterized in that, The sound-absorbing cotton (3) is made of melamine sound-absorbing cotton, and the thickness of the sound-absorbing cotton (3) in the cavity is 10cm~40cm.

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