Four-pipe vertical heat recovery fan coil device

Abstract

The invention discloses a four-pipe vertical type heat recovery fan coil device, and relates to the technical field of heat recovery fan coils, the four-pipe vertical type heat recovery fan coil device comprises a shell, and an air outlet is formed in the top side of the interior of the shell; the air inlet is formed in the bottom side of the interior of the shell, and the air inlet is formed in the side away from the air outlet; and the filter screen is arranged in the air inlet, and the filter screen is fixedly connected to the interior of the shell. According to the online cleaning device, the driving motor drives the lead screw to rotate, so that the lead screw seat drives the rectangular seat and the cleaning brush to move on the surface of the filter screen, the surface of the filter screen is cleaned online, the anti-blocking phenomenon of the filter screen in the using process is reduced, and the long-term using stability of the device in the using process is guaranteed; and an external air extractor can extract dust in the cleaning process of the cleaning brush through a pipeline, an air draft base and an air draft opening, and two rectangular bases are arranged in a matched mode, so that the dust raising phenomenon in the cleaning process of the filter screen is greatly reduced, and then the overall using performance of the device in the using process is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of heat recovery fan coil technology, and more specifically, to a four-tube vertical heat recovery fan coil unit. Background Technology

[0002] Fan coil units are ideal terminal products for central air conditioning. Their quality determines the indoor air conditioning effect. Their working principle is that the air in the room is continuously recirculated in the unit, and the air is cooled or heated after passing through the coil to achieve the purpose of regulating the room temperature. Vertical fan coil units are widely used in various places without ceilings or with insufficient ceiling space because of their flexible installation, convenient control and no need to occupy ceiling space.

[0003] For example, Chinese patent document (CN205678776U) discloses a self-maintaining vertical fan coil unit, mainly relating to the field of central air conditioning equipment. It includes a controller and a housing. The housing has an air inlet and an air outlet. Inside the housing are a partition, a medium-efficiency filter, a coil, a condensate pan, and a fan. The housing also contains a power handle, a first guide rod, and a second guide rod. A first connecting rod and a second connecting rod are hinged to the power handle. The other ends of the first and second connecting rods are respectively hinged to a first slider on the first guide rod and a second slider on the second guide rod. A first brush plate for cleaning the coil is installed on the first slider, and a second brush plate for cleaning the medium-efficiency filter is installed on the second slider. The beneficial effect of this invention is that it enables self-maintenance of the central air conditioning terminal equipment during operation, maintaining high operating efficiency and significantly reducing energy consumption. However, during use, the lint and dust generated during the cleaning process adhere to the coil under the action of the fan, affecting the cleaning and heat exchange effects of the coil. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that in the existing technology, during the cleaning process, flying lint and dust will adhere to the coil under the action of the fan, which will affect the cleaning effect and heat exchange effect of the coil. Therefore, a four-tube vertical heat recovery fan coil device is proposed.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a four-tube vertical heat recovery fan coil unit, comprising a housing, wherein an air outlet is provided on the top side inside the housing; The air inlet is located on the bottom side inside the housing, and the air inlet is located on the side away from the air outlet; The filter screen is located inside the air inlet and is fixedly connected to the inside of the housing. The dust filter assembly is installed inside the housing and above the filter screen, and is used for online shielding and cleaning of the filter screen by linear movement; A cleaning component, installed inside the housing on one side, is used for online rinsing of the dust filter assembly; The auxiliary cleaning component is installed inside the dust filter assembly to work with the dust filter assembly to further improve the cleaning effect on the filter screen.

[0006] Furthermore, the dust filter assembly includes: Two rectangular seats are symmetrically arranged on both sides of the filter screen, and the rectangular seats are slidably connected inside the housing; Four cleaning brushes are symmetrically installed in pairs inside the rectangular base; The exhaust seat is set between two cleaning brushes, and one side of the exhaust seat is fixedly connected to the inner wall of the rectangular seat. Multiple exhaust ports are opened on both sides of the interior of the exhaust seat. One side of the exhaust seat is connected to an external air extraction device and a filter collector through a pipe. The drive unit, mounted above the rectangular base, provides power for the linear movement of the rectangular base.

[0007] Furthermore, the driving unit includes: The lead screw is rotatably connected inside the housing; The lead screw seat is connected to the outer periphery of the lead screw and is slidably connected inside the housing. The bottom of the lead screw seat is fixedly connected to the top of two rectangular seats. The drive motor has one end of its output shaft fixedly connected to the outer wall of the lead screw, and the side of the drive motor away from the lead screw is fixedly connected to the inner wall of the housing.

[0008] Furthermore, the dust filter assembly also includes The two protective layers are fixedly connected to the inner wall of the lead screw seat on one side and fixedly connected to the inner wall of the housing on the other side.

[0009] Furthermore, the cleaning component includes: Both first springs are located above the drive motor, and one side of each first spring is fixedly connected to the inner wall of the housing. The first rack is fixed to one side of the two first springs and is slidably connected inside the housing. The first rack is positioned above the lead screw. The vertical plate is fixedly connected to the side of the first rack away from the first spring.

[0010] Furthermore, the cleaning component also includes: Two limiting rods are symmetrically installed below the first rack; The roller is installed at the top of the limit rod and at the bottom of the first rack; A horizontal plate is installed at the bottom of the two limit rods; The connecting block is fixedly connected to the bottom of the horizontal plate at its top, and a water spray seat is fixedly connected to the bottom of the connecting block. The water spray seat is set between two rectangular seats and is connected to an external liquid supply device through an infusion pipe. The bottom of the second spring is fixedly connected to the top of the horizontal plate, and the top of the second spring is fixedly connected to the inner wall of the housing.

[0011] Furthermore, the auxiliary cleaning component includes: Two rectangular through holes are located inside the lead screw holder, and the two rectangular through holes are set with the lead screw as the center; Two second racks are installed inside the rectangular through hole, and both sides of the second racks are fixedly connected to the inner wall of the housing; A gear is meshed with one side of a second rack. A connecting shaft is fixedly connected inside the gear. The bottom end of the connecting shaft extends into the interior of a rectangular seat and is fixedly connected inside the gear.

[0012] Furthermore, the auxiliary cleaning component also includes: Two limiting through holes are connected to the rectangular through hole respectively, and the two limiting through holes are located on the side away from the rectangular through hole; Two limiting sliders are fixed to the outer wall of the second rack, and the second rack is slidably connected to the inside of the limiting through hole through the limiting sliders.

[0013] Furthermore, it also includes: Both the air outlet and the air inlet are rectangular, and the air inlet has rotating adjustment blades inside.

[0014] Furthermore, it also includes: The fan and drive unit are installed inside the housing and are located on the side opposite the filter screen. They are used to deliver fresh air from outside into the housing through the air inlet. The coil unit is installed inside the top side of the housing and is located on the side opposite the air outlet. It is used to exchange heat with the outside fresh air through the coil unit. The piping system is installed on one side of the coil unit and extends to the outside of the housing.

[0015] Compared to existing technologies, the advantages of this solution are as follows: 1. This solution utilizes a dustproof filtration component, which drives a motor to rotate a lead screw. This lead screw then moves a rectangular seat and a cleaning brush across the filter screen surface for online cleaning. This reduces filter clogging during use and ensures long-term stability of the device. An external air extraction device removes dust from the cleaning brush through pipes, an extraction seat, and an extraction port. Combined with the two rectangular seats, this significantly reduces dust generation during filter cleaning and minimizes the impact of the online cleaning process on the device's heat exchange efficiency, thus effectively improving the overall performance of the device.

[0016] 2. This solution utilizes a cleaning assembly. When the lead screw seat moves to the vertical plate, the water spray seat enters between the two rectangular seats. The external water supply device then uses the water spray seat to rinse and clean the cleaning brushes, effectively removing impurities from the brush surface and significantly reducing dirt accumulation. This ensures the continuous operation of the device. As the lead screw seat moves, the first rack presses against the roller and the limit rod, causing the limit rod to move the horizontal plate, connecting block, and water spray seat up and down. This allows the water spray seat to rinse the cleaning brushes at different locations, covering different sections of the brushes for comprehensive rinsing. This ensures a uniform and thorough cleaning effect, further improving the overall cleaning performance and reliability of the device.

[0017] 3. This solution, through the auxiliary cleaning components, allows the lead screw seat and cleaning brush to rotate under the action of the second rack, which in turn drives the connecting shaft and cleaning brush to rotate, converting their linear motion into rotational motion. The combined motion of the cleaning brush's rotation and movement forms a highly efficient cleaning mode, which can thoroughly remove and sweep away stubborn impurities embedded in the filter mesh, significantly improving cleaning efficiency and thoroughness, thereby optimizing the overall operating performance of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional structure used to illustrate another perspective of the present invention; Figure 3 This is a schematic diagram illustrating the internal three-dimensional structure of the shell in this invention; Figure 4 For the purpose of illustrating the present invention Figure 3 A magnified schematic diagram of the structure at point A; Figure 5 This is a partial three-dimensional structural diagram illustrating the dust filter component and cleaning component in this invention; Figure 6 This is a partial structural schematic diagram illustrating another perspective of the dust filter assembly and cleaning assembly in this invention. Figure 7 For the purpose of illustrating the present invention Figure 6 A magnified schematic diagram of the structure at point B; Figure 8 For the purpose of illustrating the present invention Figure 6 A magnified structural diagram of point C.

[0019] In the diagram: 1. Housing; 2. Air outlet; 3. Air inlet; 4. Filter screen; 5. Fan and drive unit; 6. Coil unit; 7. Dust filter assembly; 701. Drive motor; 702. Lead screw; 703. Lead screw seat; 704. Rectangular seat; 705. Cleaning brush; 706. Exhaust seat; 707. Exhaust port; 708. Protective layer; 8. Cleaning assembly; 801. First spring; 802. First rack; 803. Vertical plate; 804. Limiting rod; 805. Horizontal plate; 806. Connecting block; 807. Water spray seat; 808. Second spring; 9. Auxiliary cleaning assembly; 901. Rectangular through hole; 902. Second rack; 903. Gear. Detailed Implementation

[0020] The invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are merely descriptive and are not intended to limit the scope of protection of the present invention.

[0021] Example 1: A four-tube vertical heat recovery fan coil unit, such as... Figures 1-8 As shown, it includes a housing 1, and an air outlet 2 is provided on the top side inside the housing 1; The air inlet 3 is located on the bottom side inside the housing 1, and the air inlet 3 is located on the side away from the air outlet 2; The filter screen 4 is located inside the air inlet 3 and is fixedly connected to the inside of the housing 1. The dust filter assembly 7 is installed inside the housing 1 and is located above the filter screen 4. It is used to move in a straight line to perform online shielding and cleaning of the filter screen 4. Cleaning component 8, installed inside one side of housing 1, is used to flush dust filter component 7 online; The auxiliary cleaning component 9 is installed inside the dust filter component 7 and is used to work with the dust filter component 7 to further improve the cleaning effect on the filter screen 4. Dust filter assembly 7 includes: Two rectangular seats 704 are symmetrically arranged on both sides of the filter screen 4, and the rectangular seats 704 are slidably connected inside the housing 1; Four cleaning brushes 705 are symmetrically installed in pairs inside the rectangular base 704; The exhaust seat 706 is set between two cleaning brushes 705, and one side of the exhaust seat 706 is fixedly connected to the inner wall of the rectangular seat 704. Multiple exhaust ports 707 are opened on both sides of the interior of the exhaust seat 706. One side of the exhaust seat 706 is connected to an external air extraction device and a filter collector through a pipe. The drive unit, mounted above the rectangular base 704, is used to provide power for the linear movement of the rectangular base 704; The drive unit includes: Lead screw 702 is rotatably connected inside housing 1; The lead screw seat 703 is connected to the outer periphery of the lead screw 702 and is slidably connected inside the housing 1. The bottom of the lead screw seat 703 is fixedly connected to the top of the two rectangular seats 704. The drive motor 701 has one end of its output shaft fixedly connected to the outer wall of the lead screw 702, and the side of the drive motor 701 away from the lead screw 702 is fixedly connected to the inner wall of the housing 1. Two protective layers 708 are fixedly connected to the inner wall of the lead screw seat 703 on one side and fixedly connected to the inner wall of the housing 1 on the other side. Both the air outlet 2 and the air inlet 3 are rectangular, and the air inlet 3 is equipped with rotating adjustment blades inside; The fan and drive unit 5 are installed inside the housing 1, and the fan and drive unit 5 are located on the side opposite to the filter screen 4, for delivering fresh air from outside to the housing 1 through the air inlet 3. The coil unit 6 is installed inside the top side of the housing 1 and is located on the side opposite to the air outlet 2. It is used to exchange heat with the outside fresh air through the coil unit 6. The piping system is installed on one side of the coil unit 6 and extends to the outside of the housing 1.

[0022] In practical applications, the device is first placed vertically in a suitable external location. Then, fresh air from outside is drawn into the housing 1 through the fan, drive unit 5, and air inlet 3, where it exchanges heat with the hot or cold water inside the coil unit 6 and is discharged through the air outlet 2 to achieve precise control of the room temperature. During this process, the filter 4 filters the fresh air from outside. The drive motor 701 is activated as needed, driving the lead screw 702 to rotate. Utilizing the linkage between the lead screw 702 and the lead screw seat 703, power is transmitted to the lead screw seat 703, causing it to move the rectangular seat 704 and cleaning brush 705 across the surface of the filter 4 for online cleaning. This reduces clogging of the filter 4 during use and ensures the device operates smoothly. To ensure long-term stability during use, the external air extraction device extracts dust from the cleaning brush 705 during cleaning through pipes, air extraction seat 706, and air extraction port 707. Combined with the two rectangular seats 704, this significantly reduces dust generation during the cleaning of the filter screen 4 and also helps reduce the impact of the cleaning brush 705 on the heat exchange efficiency of the device during online cleaning, thereby effectively improving the overall performance of the device during use. A drain pipe is connected to the bottom of the housing 1 relative to the water spray seat 807, and a heating unit can be installed around the cleaning brush 705 as needed to dry the clean brush 705 after rinsing. The control system, circuit system, and drainage system involved in this application are all known technical fields to those skilled in the art, and therefore are not described in detail here.

[0023] Example 2: A four-tube vertical heat recovery fan coil unit, which differs from Example 1 in that, as shown in Example 1... Figures 1-8 As shown, the cleaning component 8 includes: Two first springs 801 are both disposed above the drive motor 701, and one side of the first spring 801 is fixedly connected to the inner wall of the housing 1; The first rack 802 is fixed to one side of the two first springs 801, and the first rack 802 is slidably connected inside the housing 1. The first rack 802 is located above the lead screw 702. The vertical plate 803 is fixedly connected to the side of the first rack 802 away from the first spring 801; Two limit rods 804 are symmetrically installed below the first rack 802; The roller is installed at the top of the limit rod 804 and at the bottom of the first rack 802; The horizontal plate 805 is installed at the bottom of the two limit rods 804; The top of the connecting block 806 is fixedly connected to the bottom of the horizontal plate 805, and the bottom of the connecting block 806 is fixedly connected to the water spray seat 807. The water spray seat 807 is set between two rectangular seats 704, and the water spray seat 807 is connected to the external liquid supply device through the infusion pipe. The bottom of the second spring 808 is fixedly connected to the top of the horizontal plate 805, and the top of the second spring 808 is fixedly connected to the inner wall of the housing 1.

[0024] In practical applications, when the lead screw seat 703 moves to the vertical plate 803, the water spray seat 807 will enter between the two rectangular seats 704. The external water supply device will rinse and clean the cleaning brush 705 through the water spray seat 807, reducing the adhesion of impurities on the cleaning brush 705, thereby effectively improving the continuity of the device's use. As the lead screw seat 703 moves, it will squeeze the vertical plate 803, the first rack 802, and the first spring 801, causing the first rack 802 to squeeze the roller and the limiting rod 804, causing the limiting rod 804 to drive the horizontal plate 805, the connecting block 806, and the water spray seat 807 to move up and down, so that the water spray seat 807 can rinse the cleaning brush 705 at different positions, ensuring the overall cleaning effect of the device during use. The cleaning components 8 can be set in two according to actual needs, and can be symmetrically arranged with the housing 1 as the center according to actual needs.

[0025] Example 3: A four-tube vertical heat recovery fan coil unit, which differs from Example 1 in that, as shown in Example 1... Figures 6-8 As shown, the auxiliary cleaning component 9 includes: Two rectangular through holes 901 are located inside the lead screw seat 703, and the two rectangular through holes 901 are set with the lead screw 702 as the center; Two second racks 902 are respectively installed inside the rectangular through hole 901, and both sides of the second racks 902 are fixedly connected to the inner wall of the housing 1; Gear 903 is meshed with one side of the second rack 902. A connecting shaft is fixedly connected inside gear 903. The bottom end of the connecting shaft extends into the rectangular seat 704 and is fixedly connected inside gear 903. Two limiting through holes are connected to the rectangular through hole 901 respectively, and the two limiting through holes are located on the side away from the rectangular through hole 901; Two limiting sliders are fixed to the outer wall of the second rack 902, and the second rack 902 is slidably connected to the inside of the limiting through hole through the limiting sliders.

[0026] In practical applications, during the movement of the lead screw seat 703 and the cleaning brush 705, the gear 903 moves in a straight line around the second rack 902. Under the action of the second rack 902, the gear 903 drives the connecting shaft to rotate. Utilizing the linkage effect between the connecting shaft and the cleaning brush 705, the power is transmitted to the cleaning brush 705, causing the cleaning brush 705 to rotate, which further increases the cleaning effect on the surface of the filter screen 4 and thus improves the performance of the device.

[0027] Working principle: First, place the device vertically in a suitable external position. Then, the fan and drive unit 5 and air inlet 3 draw fresh air from outside into the housing 1, where it exchanges heat with the hot or cold water inside the coil unit 6 and is discharged through the air outlet 2 to achieve precise control of the room temperature. During this process, the filter 4 filters the fresh air from outside. The drive motor 701 is started according to actual needs. The drive motor 701 drives the lead screw 702 to rotate. The linkage effect between the lead screw 702 and the lead screw seat 703 is used to transmit power to the lead screw seat 703, so that the lead screw seat 703 drives the rectangular seat 704 and the cleaning brush 705 to move on the surface of the filter screen 4 to clean the surface of the filter screen 4 online. At this time, the external air extraction device will extract the dust in the cleaning process of the cleaning brush 705 through the pipe, the air extraction seat 706 and the air extraction port 707. With the setting of the two rectangular seats 704, the dust phenomenon in the cleaning process of the filter screen 4 is greatly reduced. During the movement of the lead screw seat 703 and the cleaning brush 705, the gear 903 will move in a straight line around the second rack 902. Under the action of the second rack 902, the gear 903 will drive the connecting shaft to rotate. By utilizing the linkage effect between the connecting shaft and the cleaning brush 705, the power is transmitted to the cleaning brush 705, causing the cleaning brush 705 to rotate, which further increases the cleaning effect on the surface of the filter screen 4. When the lead screw seat 703 moves to the vertical plate 803, the water spray seat 807 will enter between the two rectangular seats 704. The external water supply device will rinse and clean the cleaning brush 705 through the water spray seat 807, reducing the adhesion of impurities on the cleaning brush 705. As the lead screw seat 703 moves, it will squeeze the vertical plate 803, the first rack 802 and the first spring 801, causing the first rack 802 to squeeze the roller and the limiting rod 804. This causes the limiting rod 804 to drive the horizontal plate 805, the connecting block 806 and the water spray seat 807 to move up and down, allowing the water spray seat 807 to rinse the cleaning brush 705 at different positions, making it convenient to use.

[0028] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A four-tube vertical heat recovery fan coil unit, characterized in that, Includes a housing (1), and an air outlet (2) is provided on the top side inside the housing (1); An air inlet (3) is located on the bottom side inside the housing (1), and the air inlet (3) is located on the side away from the air outlet (2); The filter (4) is located inside the air inlet (3) and is fixedly connected to the inside of the housing (1); The dust filter assembly (7) is installed inside the housing (1) and above the filter screen (4) for linear movement to perform online shielding and cleaning of the filter screen (4); A cleaning component (8) is installed inside one side of the housing (1) and is used to flush the dust filter component (7) online. The auxiliary cleaning component (9) is installed inside the dust filter component (7) to work with the dust filter component (7) to further improve the cleaning effect on the filter screen (4).

2. The four-tube vertical heat recovery fan coil unit according to claim 1, characterized in that, The dust filter assembly (7) includes: Two rectangular seats (704) are symmetrically arranged on both sides of the filter screen (4), and the rectangular seats (704) are slidably connected inside the housing (1); Four cleaning brushes (705) are symmetrically installed in pairs inside the rectangular base (704); The exhaust seat (706) is set between two cleaning brushes (705), and one side of the exhaust seat (706) is fixedly connected to the inner wall of the rectangular seat (704). Multiple exhaust ports (707) are opened on both sides of the interior of the exhaust seat (706). One side of the exhaust seat (706) is connected to an external air extraction device and a filter collector through a pipe. The drive unit, mounted above the rectangular base (704), is used to provide power for the linear movement of the rectangular base (704).

3. A four-tube vertical heat recovery fan coil unit according to claim 2, characterized in that, The driving unit includes: The lead screw (702) is rotatably connected inside the housing (1); The lead screw seat (703) is connected to the outer periphery of the lead screw (702) and is slidably connected inside the housing (1). The bottom of the lead screw seat (703) is fixedly connected to the top of two rectangular seats (704). The drive motor (701) has one end of its output shaft fixedly connected to the outer wall of the lead screw (702), and the side of the drive motor (701) away from the lead screw (702) is fixedly connected to the inner wall of the housing (1).

4. A four-tube vertical heat recovery fan coil unit according to claim 3, characterized in that, The dust filter assembly (7) also includes The two protective layers (708) are fixedly connected to the inner wall of the lead screw seat (703) on one side and fixedly connected to the inner wall of the housing (1) on the other side.

5. A four-tube vertical heat recovery fan coil unit according to claim 4, characterized in that, The cleaning component (8) includes: Two first springs (801) are both set above the drive motor (701), and one side of the first spring (801) is fixedly connected to the inner wall of the housing (1); The first rack (802) is fixed to one side of the two first springs (801), and the first rack (802) is slidably connected inside the housing (1). The first rack (802) is located above the lead screw (702). The vertical plate (803) is fixedly connected to the side of the first rack (802) away from the first spring (801).

6. A four-tube vertical heat recovery fan coil unit according to claim 5, characterized in that, The cleaning component (8) also includes: Two limiting rods (804) are symmetrically installed below the first rack (802); The roller is installed at the top of the limiting rod (804) and at the bottom of the first rack (802); A horizontal plate (805) is installed at the bottom of two limit rods (804); The top of the connecting block (806) is fixedly connected to the bottom of the horizontal plate (805), and the bottom of the connecting block (806) is fixedly connected to a water spray seat (807). The water spray seat (807) is set between two rectangular seats (704), and the water spray seat (807) is connected to an external liquid supply device through an infusion pipe. The bottom of the second spring (808) is fixedly connected to the top of the horizontal plate (805), and the top of the second spring (808) is fixedly connected to the inner wall of the housing (1).

7. A four-tube vertical heat recovery fan coil unit according to claim 6, characterized in that, The auxiliary cleaning component (9) includes: Two rectangular through holes (901) are located inside the lead screw seat (703), and the two rectangular through holes (901) are set with the lead screw (702) as the center; Two second racks (902) are respectively installed inside the rectangular through hole (901), and both sides of the second racks (902) are fixedly connected to the inner wall of the housing (1); The gear (903) is meshed with one side of the second rack (902). A connecting shaft is fixedly connected inside the gear (903). The bottom end of the connecting shaft extends into the rectangular seat (704), and the connecting shaft is fixedly connected inside the gear (903).

8. A four-tube vertical heat recovery fan coil unit according to claim 7, characterized in that, The auxiliary cleaning component (9) also includes: Two limiting through holes are connected to the rectangular through hole (901) respectively, and the two limiting through holes are located on the side away from the rectangular through hole (901); Two limiting sliders are fixed to the outer wall of the second rack (902), and the second rack (902) is slidably connected to the inside of the limiting through hole through the limiting sliders.

9. A four-tube vertical heat recovery fan coil unit according to claim 1, characterized in that, Also includes: Both the air outlet (2) and the air inlet (3) are rectangular, and the air inlet (3) is equipped with rotating adjustment blades inside.

10. A four-tube vertical heat recovery fan coil unit according to claim 1, characterized in that, Also includes: The fan and drive unit (5) are installed inside the housing (1), and the fan and drive unit (5) are located on the side opposite to the filter (4) to deliver fresh air from outside to the housing (1) through the air inlet (3); The coil unit (6) is installed on the top side inside the housing (1), and the coil unit (6) is located on the side opposite to the air outlet (2) for heat exchange with the outside fresh air through the coil unit (6); The piping system is installed on one side of the coil unit (6) and extends to the outside of the housing (1).

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