Heat recovery fresh air machine with in-circulation defrosting

Abstract

This utility model discloses a heat recovery fresh air unit with internal circulation defrosting, including a housing, an exchange core, a supply fan, an exhaust fan, a filter assembly, and a valve assembly. The housing has a fresh air duct and an exhaust air duct. The fresh air duct has a fresh air inlet and a fresh air outlet at both ends, and the exhaust air duct has an exhaust air inlet and an exhaust air outlet at both ends. The valve assembly is located between the fresh air inlet and the exhaust air inlet. The valve assembly has a first state and a second state. When the valve assembly is in the second state, the fresh air inlet is closed, allowing indoor air to enter the room sequentially through the exhaust air inlet, the exchange core, and the fresh air outlet. The filter assembly is located at the air inlet end of the exchange core and can filter the airflow entering the exchange core. Simultaneously, the limiting steel wire provides structural support for the filter screen, preventing deformation under airflow. The valve assembly can switch the airflow path to utilize the waste heat from the exhaust for internal circulation defrosting of the exchange core, improving energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fresh air systems, and in particular to a heat recovery fresh air system with internal circulation defrosting. Background Technology

[0002] A fresh air system is an air handling device that introduces fresh outdoor air and exhausts stale indoor air to achieve indoor-outdoor air exchange. It is widely used in environments that require air purification, such as residences, office buildings, and public places.

[0003] In existing technologies, traditional fresh air systems are prone to frost buildup on the exchange core during operation in winter or humid climates. Once frost forms, it affects airflow, reducing heat exchange efficiency and impacting the system's operational stability. Defrosting is typically achieved using electric heating, but this method is energy-intensive, affecting energy efficiency and user experience. Furthermore, many current fresh air systems only have a single exchange core in their air filtration system, allowing large particles to adhere directly to the core, causing blockages and shortening its lifespan. Additionally, some fresh air systems have complex assembly structures, resulting in low assembly efficiency and a tendency for structural loosening during prolonged operation, thus reducing the system's reliability.

[0004] Therefore, existing technologies have shortcomings and need to be improved. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a heat recovery fresh air fan with good energy-saving effect, long service life and easy assembly, and with internal circulation defrosting.

[0006] To achieve this objective, the present invention adopts the following technical solution: a heat recovery fresh air unit with internal circulation defrosting, comprising a housing, an exchange core, a blower, an exhaust fan, a filter assembly, and a valve assembly;

[0007] The housing has a fresh air duct and an exhaust air duct inside, which are arranged symmetrically in an X-shape. The exchange core is located inside the housing and is used to recover the heat of the air in the exhaust air duct. The filter assembly is located at the air inlet of the exchange core and is used to filter the airflow entering the exchange core.

[0008] The fresh air duct has a fresh air inlet and a fresh air outlet at both ends. The blower is located between the fresh air inlet and the fresh air outlet. The blower is used to allow the outdoor air to enter the room by passing through the fresh air inlet, the exchange core and the fresh air outlet in sequence.

[0009] The exhaust duct has an exhaust inlet and an exhaust outlet at both ends. The exhaust fan is located between the exhaust inlet and the exhaust outlet. The exhaust fan is used to allow indoor air to pass through the exhaust inlet, the exchange core and the exhaust outlet in sequence and be discharged to the outside.

[0010] The fresh air inlet is connected to the exhaust air inlet, and the valve assembly is located between the fresh air inlet and the exhaust air inlet. The valve assembly has a first state and a second state.

[0011] When the valve assembly is in the first state, it isolates the fresh air inlet from the exhaust air inlet. When the valve assembly is in the second state, it closes the fresh air inlet, so that indoor air enters the room sequentially through the exhaust air inlet, the exchange core, and the fresh air outlet.

[0012] Using the above technical solution, in the heat recovery fresh air machine with internal circulation defrosting, the exchange core has a prismatic or rectangular structure, a fixing seat is provided on the peripheral wall inside the box, and the surface of the fixing seat is provided with a clamping groove for clamping and fixing the exchange core.

[0013] Using the above technical solution, in the heat recovery fresh air machine with internal circulation defrosting, the filter assembly includes a filter screen, a filter screen slide rail, and a filter screen pressure plate;

[0014] The side walls of the fixed base located on both sides and the bottom of the housing are provided with filter screen clamping grooves. The filter screen slide rail is slidably disposed on the filter screen clamping grooves. The end of the filter screen is located in the filter screen slide rail. The filter screen is used to perform initial filtration on the airflow entering the exchange core.

[0015] The filter screen pressure plate is located on the side of the filter screen slide rail, and the filter screen pressure plate is used to prevent the filter screen from slipping out of the filter screen slide rail.

[0016] Using the above technical solution, in the heat recovery fresh air machine with internal circulation defrosting, the filter component further includes a limiting steel wire and a steel wire tube sleeve;

[0017] The limiting steel wire is disposed between the filter screen and the exchange core. The side of the filter screen slide rail is provided with a wire hole for the limiting steel wire to pass through. The limiting steel wire is used to limit the deformation of the filter screen under the action of airflow. The steel wire tube covers the surface of the limiting steel wire.

[0018] The heat recovery fresh air machine with internal circulation defrosting, using the above technical solution, further includes a core pressure plate, which is located on the side of the fixed base and is used to prevent the exchange core from slipping out of the clamping groove.

[0019] Using the above technical solution, in the heat recovery fresh air machine with internal circulation defrosting, the valve assembly includes a triangular seat, a drive motor, a connecting rod, and a valve baffle.

[0020] The triangular base is disposed in the box between the fresh air inlet and the exchange core. The peripheral wall of the triangular base is provided with a first air inlet, a second air inlet and an air outlet. The first air inlet is disposed facing the fresh air inlet, the second air inlet is disposed facing the exhaust air inlet, and the air outlet is disposed facing the exchange core.

[0021] The drive motor is located on the side wall of the triangular seat. The output shaft of the drive motor is connected to the valve baffle through the connecting rod. The drive motor is used to drive the valve baffle to rotate, so as to switch the position to block the first air inlet or the second air inlet. When the valve assembly is in the first state, the valve baffle blocks the second air inlet. When the valve assembly is in the second state, the valve baffle blocks the first air inlet.

[0022] In the heat recovery fresh air unit with internal circulation defrosting described above, the inner wall of the housing is provided with a positioning groove, which is used to position and place the exchange core.

[0023] In the heat recovery fresh air machine with internal circulation defrosting described above, the surface of the exchange core is provided with a handle to facilitate its removal from the clamping groove.

[0024] Using the above technical solution, in the heat recovery fresh air unit with internal circulation defrosting, a control box is provided on the top of the housing, and the blower, exhaust fan and valve assembly are electrically connected to the control box.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention features a fresh air duct and an exhaust air duct arranged symmetrically in an X-shape within the housing, enabling efficient heat exchange between the fresh and exhaust air within the exchange core and improving the heat recovery efficiency of the airflow. A filter assembly located at the air inlet of the exchange core filters the incoming airflow, while a limiting steel wire provides structural support to the filter screen, preventing deformation under airflow. A valve assembly switches the airflow path, utilizing the exhaust waste heat for internal defrosting of the exchange core without additional heating, resulting in excellent energy savings. The overall structure is compact, effectively improving the operating efficiency and reliability of the fresh air unit. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is an exploded view of the filter assembly of this utility model;

[0031] Figure 3 This is a schematic diagram of the internal structure of the box of this utility model;

[0032] Figure 4 This is a schematic diagram of the valve assembly of this utility model in its first state.

[0033] Figure 5 This is a schematic diagram of the valve assembly of this utility model in its second state.

[0034] Figure 6 This is a schematic diagram of the filter assembly structure of this utility model;

[0035] Figure 7 This is a schematic diagram of the valve assembly structure of this utility model;

[0036] Figure 8 This is a schematic diagram of the valve assembly of this utility model from another perspective. Detailed Implementation

[0037] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0038] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0039] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 1 to 8 As shown, this utility model embodiment provides a heat recovery fresh air unit with internal circulation defrosting, including a housing 1, an exchange core 2, a blower 31, an exhaust fan 32, a filter assembly 4, and a valve assembly 5. The housing 1 has a fresh air channel and an exhaust air channel inside, which are arranged symmetrically in an X-shape. The exchange core 2 is located inside the housing 1 and is used to recover the heat of the air in the exhaust air channel. The filter assembly 4 is located at the air inlet of the exchange core 2 and is used to filter the airflow entering the exchange core 2 to prevent dust, hair, or particulate impurities from adhering to the internal structure of the exchange core 2, which would lead to a decrease in heat exchange efficiency or blockage, thereby affecting the operational stability of the fresh air unit. The exchange core 2 can exchange heat with the airflow in the fresh air channel and the exhaust air channel, making the temperature of the air entering the room closer to the room temperature, improving comfort while reducing heating or cooling energy consumption.

[0041] like Figure 4 and Figure 5 As shown, the fresh air duct has a fresh air inlet 101 and a fresh air outlet 102 at both ends. The blower 31 is located between the fresh air inlet 101 and the fresh air outlet 102. The blower 31 is used to allow outdoor air to enter the room by passing through the fresh air inlet 101, the exchange core 2 and the fresh air outlet 102 in sequence. Outdoor air is first drawn in by the blower 31 through the fresh air inlet 101. Driven by the blower 31, the air flows through the filter assembly 4 and the exchange core 2 in sequence, and exchanges heat with the indoor exhaust air from the exhaust duct. The temperature of the fresh air after the exchange is closer to the indoor environment, thereby reducing the energy consumption of the indoor air conditioning system. The fresh air after heat exchange continues to flow to the fresh air outlet 102 under the action of the blower 31 and enters the room, thereby achieving the dual effects of air renewal and heat recovery.

[0042] The exhaust duct has an exhaust inlet 103 and an exhaust outlet 104 at both ends. The exhaust fan 32 is located between the exhaust inlet 103 and the exhaust outlet 104. The exhaust fan 32 is used to allow indoor air to pass through the exhaust inlet 103, the exchange core 2 and the exhaust outlet 104 in sequence and be discharged to the outside. Indoor exhaust gas can be drawn in by the exhaust fan 32 through the exhaust inlet 103 and, driven by the exhaust fan 32, passes through the filter assembly 4 and the exchange core 2 in sequence. In the exchange core 2, heat is exchanged with the outdoor air from the fresh air duct, and the heat energy carried by the exhaust gas is transferred to the fresh air, thereby realizing energy recovery.

[0043] The fresh air inlet 101 is connected to the exhaust air inlet 103. The valve assembly 5 is located between the fresh air inlet 101 and the exhaust air inlet 103. The valve assembly 5 has a first state and a second state. When the valve assembly 5 is in the first state, it isolates the fresh air inlet 101 from the exhaust air inlet 103. When the valve assembly 5 is in the second state, it closes the fresh air inlet 101, so that indoor air enters the room sequentially through the exhaust air inlet 103, the exchange core 2 and the fresh air outlet 102. When valve assembly 5 is in the first state, the fresh air inlet 101 and the exhaust air inlet 103 are isolated, and the fresh air unit is in normal fresh air exchange mode. Outdoor air enters from the fresh air inlet 101, exchanges heat with the exhaust air through the exchange core 2, and is then sent into the room through the fresh air outlet 102, completing the heat recovery and air exchange process. When the exchange core 2 needs to be defrosted, valve assembly 5 switches to the second state, automatically closing the fresh air inlet 101 and connecting the exhaust air inlet 103 with the fresh air duct. The indoor air that should have been exhausted is guided to the exchange core 2 through the exhaust air inlet 103 and re-enters the room through the fresh air outlet 102, forming a closed internal circulation channel. At this time, the exhaust airflow that originally contained residual heat heats the frosted area when passing through the exchange core 2, achieving the purpose of defrosting and avoiding the increase in energy consumption caused by defrosting.

[0044] like Figure 1 and Figure 3 As shown, the exchange core 2 has a prismatic or rectangular structure, and a fixing seat 11 is provided on the peripheral wall inside the housing 1. The surface of the fixing seat 11 is provided with a clamping groove 110 for clamping and fixing the exchange core 2 to prevent the exchange core 2 from becoming loose under the action of airflow or vibration.

[0045] like Figure 2 and Figure 6As shown, the filter assembly 4 further includes a filter screen 41, a filter screen slide rail 42, and a filter screen pressure plate 43; the side walls of the fixing base 11 located on both sides and the bottom of the housing 1 are provided with filter screen clamping grooves 111, the filter screen slide rail 42 is slidably disposed on the filter screen clamping grooves 111, and the end of the filter screen 41 is located inside the filter screen slide rail 42, so that the filter screen 41 can be smoothly inserted or pulled out, improving the ease of disassembly and assembly of the filter screen 41; the filter screen 41 is used to perform initial filtration on the airflow entering the exchange core 2; the filter screen pressure plate 43 is disposed on the side of the filter screen slide rail 42, and the filter screen pressure plate 43 is used to prevent the filter screen 41 from slipping out of the filter screen slide rail 42.

[0046] like Figure 6 As shown, the filter assembly 4 further includes a limiting wire 44 and a wire tube 45. The limiting wire 44 is disposed between the filter screen 41 and the exchange core 2. The filter screen slide rail 42 has a threading hole on its side for the limiting wire 44 to pass through. The limiting wire 44 can provide structural support for the filter screen 41 to limit the deformation of the filter screen 41 under the action of airflow, and prevent it from affecting the smooth airflow and filtration effect. The wire tube 45 covers the surface of the limiting wire 44 to prevent the excessively thin limiting wire 44 from squeezing and tearing the filter screen 41.

[0047] like Figure 1 and Figure 3 As shown, it further includes a core pressure plate 12, which is disposed on the side end of the fixing seat 11. The core pressure plate 12 is used to prevent the exchange core 2 from slipping out of the clamping groove 110.

[0048] like Figures 4 to 8As shown, the valve assembly 5 further includes a triangular seat 51, a drive motor 52, a connecting rod 53, and a valve baffle 54. The triangular seat 51 is disposed in the housing 1 between the fresh air inlet 101 and the exchange core 2. The peripheral wall of the triangular seat 51 is provided with a first air inlet 511, a second air inlet 512, and an air outlet 513. The first air inlet 511 faces the fresh air inlet 101, the second air inlet 512 faces the exhaust inlet 103, and the air outlet 513 faces the exchange core 2. The drive motor 52 is disposed on the side wall of the triangular seat 51, and the output shaft of the drive motor 52 is connected to the connecting rod 54. 3. Connected to the valve baffle 54, the drive motor 52 drives the valve baffle 54 to rotate, switching positions to block the first air inlet 511 or the second air inlet 512, thereby achieving automatic switching of the airflow path. When the valve assembly 5 is in the first state, the valve baffle 54 blocks the second air inlet 512, allowing outdoor fresh air to flow to the exchange core 2 through the first air inlet 511. When the valve assembly 5 is in the second state, the valve baffle 54 blocks the first air inlet 511, the outdoor fresh air is isolated, and the indoor exhaust air flows to the exchange core 2 and the fresh air outlet 102 through the second air inlet 512, forming an internal circulation path, thereby achieving the defrosting function.

[0049] like Figure 1 and Figure 3 As shown, the inner wall of the housing 1 is provided with a positioning groove 100, which is used to position and place the switching core 2, thereby improving the assembly efficiency and accuracy of the switching core 2.

[0050] like Figure 1 As shown, the surface of the exchange core 2 is provided with a handle 21 to facilitate its removal from the clamping groove 110. When the exchange core 2 needs to be cleaned, replaced or repaired, the maintenance personnel can use the handle 21 to smoothly pull the exchange core 2 out of the clamping groove 110, thereby improving the convenience of operation.

[0051] like Figure 1 As shown, the top of the housing 1 is provided with a control box 6, and the blower 31, the exhaust fan 32 and the valve assembly 5 are electrically connected to the control box 6.

[0052] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

[0053] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heat recovery fresh air system with internal circulation defrosting, characterized in that, Includes housing, exchange core, air supply fan, exhaust fan, filter assembly, and valve assembly; The housing has a fresh air duct and an exhaust air duct inside, which are arranged symmetrically in an X-shape. The exchange core is located inside the housing and is used to recover the heat of the air in the exhaust air duct. The filter assembly is located at the air inlet of the exchange core and is used to filter the airflow entering the exchange core. The fresh air duct has a fresh air inlet and a fresh air outlet at both ends. The blower is located between the fresh air inlet and the fresh air outlet. The blower is used to allow outdoor air to enter the room in sequence through the fresh air inlet, the exchange core and the fresh air outlet. The exhaust duct has an exhaust inlet and an exhaust outlet at both ends. The exhaust fan is located between the exhaust inlet and the exhaust outlet. The exhaust fan is used to allow indoor air to pass through the exhaust inlet, the exchange core and the exhaust outlet in sequence and be discharged to the outside. The fresh air inlet is connected to the exhaust air inlet, and the valve assembly is located between the fresh air inlet and the exhaust air inlet. The valve assembly has a first state and a second state. When the valve assembly is in the first state, it isolates the fresh air inlet from the exhaust air inlet. When the valve assembly is in the second state, it closes the fresh air inlet, so that indoor air enters the room sequentially through the exhaust air inlet, the exchange core, and the fresh air outlet.

2. The heat recovery fresh air unit with internal circulation defrosting according to claim 1, characterized in that, The switching core has a prismatic or rectangular structure, and a fixing seat is provided on the peripheral wall inside the box. The surface of the fixing seat is provided with a clamping groove for clamping and fixing the switching core.

3. The heat recovery fresh air unit with internal circulation defrosting according to claim 2, characterized in that, The filter assembly includes a filter screen, a filter screen slide rail, and a filter screen pressure plate. The side walls of the fixed base located on both sides and the bottom of the housing are provided with filter screen clamping grooves. The filter screen slide rail is slidably disposed on the filter screen clamping grooves. The end of the filter screen is located in the filter screen slide rail. The filter screen is used to perform initial filtration on the airflow entering the exchange core. The filter screen pressure plate is located on the side of the filter screen slide rail, and the filter screen pressure plate is used to prevent the filter screen from slipping out of the filter screen slide rail.

4. The heat recovery fresh air unit with internal circulation defrosting according to claim 3, characterized in that, The filter assembly also includes a limiting steel wire and a steel wire tube sleeve; The limiting steel wire is disposed between the filter screen and the exchange core. The side of the filter screen slide rail is provided with a wire hole for the limiting steel wire to pass through. The limiting steel wire is used to limit the deformation of the filter screen under the action of airflow. The steel wire tube covers the surface of the limiting steel wire.

5. The heat recovery fresh air unit with internal circulation defrosting according to claim 2, characterized in that, It also includes a core pressure plate, which is located at the side end of the fixed base and is used to prevent the exchange core from slipping out of the clamping groove.

6. The heat recovery fresh air unit with internal circulation defrosting according to claim 3, characterized in that, The valve assembly includes a triangular seat, a drive motor, a connecting rod, and a valve baffle. The triangular base is disposed in the box between the fresh air inlet and the exchange core. The peripheral wall of the triangular base is provided with a first air inlet, a second air inlet and an air outlet. The first air inlet is disposed facing the fresh air inlet, the second air inlet is disposed facing the exhaust air inlet, and the air outlet is disposed facing the exchange core. The drive motor is located on the side wall of the triangular seat. The output shaft of the drive motor is connected to the valve baffle through the connecting rod. The drive motor is used to drive the valve baffle to rotate, so as to switch the position to block the first air inlet or the second air inlet. When the valve assembly is in the first state, the valve baffle blocks the second air inlet. When the valve assembly is in the second state, the valve baffle blocks the first air inlet.

7. The heat recovery fresh air unit with internal circulation defrosting according to claim 2, characterized in that, The inner wall of the housing is provided with a positioning groove, which is used to position and place the switching core.

8. The heat recovery fresh air unit with internal circulation defrosting according to claim 2, characterized in that, The surface of the exchange core is provided with a handle to facilitate its removal from the clamping slot.

9. The heat recovery fresh air unit with internal circulation defrosting according to any one of claims 1-8, characterized in that, The top of the enclosure is equipped with a control box, and the blower, exhaust fan and valve assembly are electrically connected to the control box.

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