Heat recovery fresh air machine with in-circulation defrosting

Abstract

The utility model discloses a kind of heat recovery fresh air machines with internal circulation defrosting, including box, partition, exchange core, air supply fan, exhaust fan and internal circulation valve, the partition separates and forms first chamber, second chamber and third chamber in box interior, the exchange core is located in first chamber, the internal circulation valve has first state and second state, when internal circulation valve is in second state, close fresh air inlet, to make indoor air in turn through exhaust inlet, exchange core, second airflow through hole and fresh air outlet into indoor.The utility model separates and separates left and right by partition inside box, cooperate first airflow through hole and second airflow through hole, can form independent air supply and exhaust passage, improve exchange core heat exchange efficiency;Internal circulation valve is switched to defrosting state, make indoor warm air flow through exchange core and carry out internal circulation flow defrosting, and need not heat, overall structure is compact, energy saving in operation, effectively improve the reliability and experience of fresh air machine under low temperature.

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] However, during operation in low-temperature winter environments, frost can easily form inside or on the surface of the heat exchange core during the heat exchange process between the external low-temperature fresh air and the indoor exhaust air. Once frost forms and blocks the airflow, it will affect the smooth flow of air, thereby reducing the heat exchange efficiency and affecting the operational stability of the fresh air unit. To defrost, electric heating is usually used in the fresh air unit, but this defrosting method has high energy consumption, affecting the energy-saving effect and user experience. In addition, the air duct layout in traditional fresh air units is not compact enough, resulting in a large overall size, making it difficult to install in space-constrained places.

[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 a compact structure, reasonable air duct arrangement, and automatic defrosting and 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, a partition plate, an exchange core, a blower, an exhaust fan, and an internal circulation valve;

[0007] The box body has an internal accommodating chamber, and the partition plate is disposed in the accommodating chamber, dividing the accommodating chamber into a first chamber, a second chamber and a third chamber;

[0008] The top of the box above the first chamber is provided with a fresh air inlet and an exhaust air inlet on both sides. The exchange core is located in the first chamber. The peripheral wall of the box is provided with a fixing seat. The fixing seat is provided with a positioning groove for abutting against the side wall of the exchange core.

[0009] The top of the box above the second chamber is provided with an exhaust outlet, and the top of the box above the third chamber is provided with a fresh air outlet. The air outlet of the exhaust fan is connected to the exhaust outlet, and the air outlet of the blower is connected to the fresh air outlet.

[0010] The partition plate is provided with a first air passage and a second air passage on both sides of its bottom. The first chamber is connected to the second chamber through the first air passage, and the first chamber is connected to the third chamber through the second air passage.

[0011] The blower is used to allow outdoor air to enter the room through the fresh air inlet, the exchange core, the second air flow hole and the fresh air outlet in sequence, and the exhaust fan is used to allow indoor air to be discharged to the outside through the exhaust inlet, the exchange core, the first air flow hole and the exhaust outlet in sequence.

[0012] The internal circulation valve is located between the fresh air inlet and the exhaust air inlet. The internal circulation valve has a first state and a second state. When the internal circulation valve is in the first state, it isolates the fresh air inlet from the exhaust air inlet. When the internal circulation valve 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, the second airflow hole and the fresh air outlet.

[0013] Using the above technical solution, in the heat recovery fresh air machine with internal circulation defrosting, the internal circulation valve includes a triangular seat, a drive motor, a connecting rod, and a valve baffle.

[0014] The triangular base is provided with a first air inlet, a second air inlet, and an air outlet on its peripheral wall. The first air inlet is connected to the fresh air inlet, the second air inlet is connected to the exhaust air inlet, and the air outlet is oriented toward the exchange core.

[0015] 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 internal circulation valve is in the first state, the valve baffle blocks the second air inlet. When the internal circulation valve is in the second state, the valve baffle blocks the first air inlet.

[0016] The heat recovery fresh air unit with internal circulation defrosting, which adopts the above technical solution, also includes filter cotton and filter cotton compression spring;

[0017] The filter cotton is disposed on the upper end face of the exchange core. The filter cotton is used to filter the airflow entering the exchange core. One end of the filter cotton compression spring is connected to the fixed base, and the other end of the filter cotton compression spring abuts against the surface of the filter cotton. The filter cotton compression spring is used to apply elastic force to the filter cotton so that the filter cotton is tightly attached to the surface of the exchange core.

[0018] In the heat recovery fresh air machine with internal circulation defrosting described above, the side wall of the positioning groove is provided with an anti-detachment plate, which abuts against the side wall of the exchange core to restrict the exchange core from slipping out of the positioning groove.

[0019] 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.

[0020] Using the above technical solution, in the heat recovery fresh air machine with internal circulation defrosting, the partition plate includes a horizontal part and a vertical part, and the vertical part is arranged perpendicular to the horizontal part.

[0021] In the heat recovery fresh air machine with internal circulation defrosting described above, the partition plate and the housing are integrally formed.

[0022] In the heat recovery fresh air unit with internal circulation defrosting described above, the partition plate is provided with a support plate for supporting the installation of the supply fan and the exhaust fan.

[0023] Using the above technical solution, in the heat recovery fresh air unit with internal circulation defrosting, the installation height of the supply fan and the exhaust fan are not on the same horizontal plane.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention divides the internal chambers into a first chamber, a second chamber, and a third chamber by installing a partition plate inside the housing. A first airflow hole and a second airflow hole are also provided at the bottom of the partition plate, structurally separating the supply and exhaust air paths to form independent supply and exhaust paths. This effectively prevents airflow mixing and interference, improving the heat exchange efficiency of the heat exchange core. An internal circulation valve is located between the fresh air inlet and the exhaust air inlet. When switched to defrost mode, it forms a closed internal circulation recovery path, allowing warm indoor air to flow through the heat exchange core for defrosting. This achieves efficient defrosting without heating or interrupting ventilation. The overall structure is compact and energy-saving, enabling the fresh air unit to operate stably even in low-temperature environments, effectively improving the operational reliability and user experience of the fresh air unit. Attached Figure Description

[0026] 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.

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the structure of the fresh air unit of this utility model in normal ventilation mode;

[0029] Figure 2 This is a schematic diagram of the structure of the fresh air unit of this utility model in defrosting mode;

[0030] Figure 3 This is a schematic diagram of the overall structure of the box body of this utility model;

[0031] Figure 4 This is a schematic diagram of the switching core installation structure of this utility model;

[0032] Figure 5 This is a schematic diagram of the installation structure of the internal circulation valve of this utility model;

[0033] Figure 6 This is a schematic diagram of the installation structure of the blower and exhaust fan of this utility model;

[0034] Figure 7 This is a schematic diagram of the drive motor mounting structure for the internal circulation valve of this utility model.

[0035] Figure 8 This is a schematic diagram of the connecting rod installation structure of the circulation valve of this utility model. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] 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, a partition plate 2, an exchange core 3, a blower 41, an exhaust fan 42, and an internal circulation valve 5. The housing 1 has an internal accommodating chamber, and the partition plate 2 is disposed in the accommodating chamber, dividing the accommodating chamber into a first chamber 101, a second chamber 102, and a third chamber 103. Fresh air inlets 11 and exhaust inlets 12 are respectively provided on both sides of the top of the housing 1 above the first chamber 101. The exchange core 3 is disposed in the first chamber 101. A fixing seat 10 is provided on the peripheral wall of the housing 1, and the fixing seat 10 has a positioning groove 100 for abutting against the side wall of the exchange core 3. An exhaust outlet 13 is provided on the top of the housing 1 above the second chamber 102. The third chamber 101... The top of the box 1 above 3 is provided with a fresh air outlet 14. The air outlet of the exhaust fan 42 is connected to the exhaust outlet 13. The air outlet of the supply fan 41 is connected to the fresh air outlet 14. The bottom sides of the partition plate 2 are respectively provided with a first air flow hole 104 and a second air flow hole 105. The first chamber 101 is connected to the second chamber 102 through the first air flow hole 104. The first chamber 101 is connected to the third chamber 103 through the second air flow hole 105. The supply fan 41 is used to allow outdoor air to enter the room sequentially through the fresh air inlet 11, the exchange core 3, the second air flow hole 105 and the fresh air outlet 14. The exhaust fan 42 is used to allow indoor air to be discharged to the outside sequentially through the exhaust inlet 12, the exchange core 3, the first air flow hole 104 and the exhaust outlet 13.

[0040] The first chamber 101, serving as a heat exchange area, is equipped with an exchange core 3 and is where heat transfer occurs between fresh air and exhaust air. The second chamber 102 guides the exhaust fan 42 to discharge the heat-exchanged indoor air to the outside. The third chamber 103 guides the supply fan 41 to deliver the heat-exchanged fresh air into the room. The partition 2 separates different airflow zones, preventing airflow interference between supply and exhaust air and shortening the internal airflow path, thereby reducing pressure loss and improving heat exchange efficiency. During operation, outdoor fresh air enters through the fresh air inlet 11 and first enters the first chamber 101 equipped with the exchange core 3, where it exchanges heat with the exhaust air from the room under physical isolation. The heat-exchanged fresh air then passes through the third chamber 103... The air flows into the third chamber 103 through the second air passage 105 at the bottom of the first chamber 101 and is then sent out by the supply fan 41. It is then delivered into the room through the fresh air outlet 14, thus introducing fresh air after heat exchange. At the same time, the stale air in the room is drawn in by the exhaust fan 42 through the exhaust inlet 12 and enters the first chamber 101 to exchange heat with the fresh air. Then, it enters the second chamber 102 through the first air passage 104 and is discharged to the outside through the exhaust outlet 13, thus completing the exhaust process after energy recovery. Through this arrangement of vertical access and horizontal separation, the airflow forms an orderly flow in the housing 1, and the supply and exhaust paths do not interfere with each other, effectively improving the heat exchange efficiency of the airflow. Moreover, the overall structural layout is more compact, effectively improving the energy-saving effect and operational stability of the fresh air unit.

[0041] The internal circulation valve 5 is located between the fresh air inlet 11 and the exhaust air inlet 12. The internal circulation valve 5 has a first state and a second state. When the internal circulation valve 5 is in the first state, it isolates the fresh air inlet 11 from the exhaust air inlet 12. When the internal circulation valve 5 is in the second state, it closes the fresh air inlet 11, so that indoor air enters the room sequentially through the exhaust air inlet 12, the exchange core 3, the second air flow hole 105 and the fresh air outlet 14. In normal ventilation mode, the internal circulation valve 5 is in the first state, at which time the fresh air inlet 11 and the exhaust air inlet 12 are separated. Fresh outdoor air can enter from the fresh air inlet 11, pass through the exchange core 3 and be sent into the room, while the stale indoor air is discharged from the exhaust outlet 13 after heat exchange from the exhaust inlet 12, achieving efficient indoor and outdoor air exchange and heat recovery. When it is necessary to defrost the exchange core 3, the internal circulation valve 5 can be switched to the second state to close the fresh air inlet 11 and block the inflow of cold outdoor air. At this time, the indoor return air enters from the exhaust inlet 12, absorbs heat through the exchange core 3, and then enters the third chamber 103 through the second air flow hole 105, and is sent back to the room through the fresh air outlet 14, forming a closed indoor hot air return path, so that warm air continuously flows through the surface of the exchange core 3 to effectively defrost it. The defrosting process does not require heating elements and does not affect indoor air circulation, achieving a balance between defrosting and ventilation. This setting not only allows the fresh air unit to operate stably in cold environments, but also reduces energy consumption and improves the overall intelligence level of the unit and the user experience.

[0042] like Figure 5 , Figure 7 and Figure 8As shown, the internal circulation valve 5 further includes a triangular seat 51, a drive motor 52, a connecting rod 53, and a valve baffle 54. The triangular seat 51 has a first air inlet 511, a second air inlet 512, and an air outlet 513 on its peripheral wall. The first air inlet 511 is connected to the fresh air inlet 11, the second air inlet 512 is connected to the exhaust air inlet 12, and the air outlet 513 is oriented towards the exchange core 3. The drive motor 52 is located on the side wall of the triangular seat 51, and the output shaft of the drive motor 52 is connected to the valve baffle 54 through the connecting rod 53. The drive motor 52 is used to drive the valve baffle 54 to rotate, so as to switch the position to block the first air inlet 511 or the second air inlet 512. When the internal circulation valve 5 is in the first state, the valve baffle 54 blocks the second air inlet 512. When the internal circulation valve 5 is in the second state, the valve baffle 54 blocks the first air inlet 511. When the fresh air unit is in normal ventilation mode, the drive motor 52 controls the valve baffle 54 to block the second air inlet 512, allowing fresh air to enter only from the fresh air inlet 11. When the ambient temperature drops and frost occurs inside the exchange core 3, the fresh air unit can switch to defrost mode. At this time, the motor drives the baffle to rotate to the position of blocking the first air inlet 511 to cut off the supply of cold outdoor air, allowing warm indoor air to enter through the exhaust inlet 12, and then flow through the second air inlet 512 and the air outlet 513 to the exchange core 3 for thermal defrosting treatment, and then return to the room through the fresh air duct.

[0043] like Figure 4 As shown, further, it also includes filter cotton 61 and filter cotton compression spring 62. The filter cotton 61 is disposed on the upper end face of the heat exchange core 3. The filter cotton 61 is used to filter the airflow entering the heat exchange core 3. One end of the filter cotton compression spring 62 is connected to the fixing base 10, and the other end of the filter cotton compression spring 62 abuts against the surface of the filter cotton 61. The filter cotton compression spring 62 is used to apply elastic force to the filter cotton 61 so that the filter cotton 61 is tightly attached to the surface of the heat exchange core 3. By placing the filter cotton 61 on the upper end face of the heat exchange core 3, the airflow before entering the heat exchange core 3 can be effectively filtered to intercept dust, particulate matter and other impurities in the air, preventing these pollutants from entering the heat exchange channel, thereby reducing dust accumulation and blockage on the surface of the heat exchange core 3 and extending its service life. The filter cotton compression spring 62 can press the filter cotton 61 tightly onto the heat exchange core 3 by applying elastic force, which not only improves structural stability, but also effectively improves the convenience of subsequent disassembly and assembly.

[0044] like Figure 1 and Figure 2 As shown, the positioning groove 100 is further provided with an anti-detachment plate 31 on its side wall. The anti-detachment plate 31 abuts against the side wall of the exchange core 3 to restrict the exchange core 3 from sliding out of the positioning groove 100.

[0045] like Figure 4 As shown, the surface of the exchange core 3 is provided with a handle 32 to facilitate its removal from the positioning groove 100.

[0046] like Figure 6 As shown, the partition plate 2 further includes a horizontal portion 21 and a vertical portion 22, with the vertical portion 22 arranged perpendicularly to the horizontal portion 21. The horizontal portion 21 is arranged along the front-to-back direction of the housing 1, used to divide the functional areas in the front-to-back direction, so that the heat exchange and air supply and exhaust functions do not overlap or interfere with each other in the front-to-back space; while the vertical portion 22 is arranged along the left-to-right direction of the housing 1, which can further divide the internal space of the housing 1 into two independent chambers in the left-to-right direction, which respectively undertake the air supply and exhaust functions. The perpendicular arrangement of the horizontal portion 21 and the vertical portion 22 makes the partition plate 2 form a stable frame structure. This arrangement not only optimizes the utilization efficiency of the internal space of the housing 1, but also improves the compactness of the overall structure of the equipment and the stability of the airflow.

[0047] Furthermore, the partition plate 2 and the box body 1 are integrally formed, which improves the overall structural strength of the partition plate 2.

[0048] like Figure 6 As shown, the partition plate 2 is further provided with a support plate 23 for supporting and installing the blower 41 and the exhaust fan 42.

[0049] like Figure 6 As shown, the installation heights of the supply fan 41 and the exhaust fan 42 are not on the same horizontal plane. When installing a circular fan, a certain boundary space needs to be reserved to accommodate its volume. If the supply fan 41 and the exhaust fan 42 are arranged side by side on the same horizontal plane, the housing 1 will occupy a large space in the horizontal direction, resulting in an increase in the width of the whole unit and an increase in the overall volume. However, by arranging the supply fan 41 and the exhaust fan 42 in a staggered manner in the vertical direction, the horizontal overlap between the two fans can be avoided, thereby reducing the horizontal dimension of the fresh air unit and making the housing 1 more compact.

[0050] 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, partitions, exchange core, air supply fan, exhaust fan, and internal circulation valve; The box body has an internal accommodating chamber, and the partition plate is disposed in the accommodating chamber, dividing the accommodating chamber into a first chamber, a second chamber and a third chamber; The top of the box above the first chamber is provided with a fresh air inlet and an exhaust air inlet on both sides. The exchange core is located in the first chamber. The peripheral wall of the box is provided with a fixing seat. The fixing seat is provided with a positioning groove for abutting against the side wall of the exchange core. The top of the box above the second chamber is provided with an exhaust outlet, and the top of the box above the third chamber is provided with a fresh air outlet. The air outlet of the exhaust fan is connected to the exhaust outlet, and the air outlet of the blower is connected to the fresh air outlet. The partition plate is provided with a first air passage and a second air passage on both sides of its bottom. The first chamber is connected to the second chamber through the first air passage, and the first chamber is connected to the third chamber through the second air passage. The blower is used to allow outdoor air to enter the room through the fresh air inlet, the exchange core, the second air flow hole and the fresh air outlet in sequence, and the exhaust fan is used to allow indoor air to be discharged to the outside through the exhaust inlet, the exchange core, the first air flow hole and the exhaust outlet in sequence. The internal circulation valve is located between the fresh air inlet and the exhaust air inlet. The internal circulation valve has a first state and a second state. When the internal circulation valve is in the first state, it isolates the fresh air inlet from the exhaust air inlet. When the internal circulation valve 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, the second airflow hole and the fresh air outlet.

2. The heat recovery fresh air unit with internal circulation defrosting according to claim 1, characterized in that, The internal circulation valve includes a triangular seat, a drive motor, a connecting rod, and a valve baffle. The triangular base is provided with a first air inlet, a second air inlet, and an air outlet on its peripheral wall. The first air inlet is connected to the fresh air inlet, the second air inlet is connected to the exhaust air inlet, and the air outlet is oriented toward 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 internal circulation valve is in the first state, the valve baffle blocks the second air inlet. When the internal circulation valve is in the second state, the valve baffle blocks the first air inlet.

3. The heat recovery fresh air unit with internal circulation defrosting according to claim 1, characterized in that, It also includes filter cotton and filter cotton compression spring; The filter cotton is disposed on the upper end face of the exchange core. The filter cotton is used to filter the airflow entering the exchange core. One end of the filter cotton compression spring is connected to the fixed base, and the other end of the filter cotton compression spring abuts against the surface of the filter cotton. The filter cotton compression spring is used to apply elastic force to the filter cotton so that the filter cotton is tightly attached to the surface of the exchange core.

4. The heat recovery fresh air unit with internal circulation defrosting according to claim 1, characterized in that, The positioning groove sidewall is provided with an anti-detachment plate, which abuts against the sidewall of the exchange core to prevent the exchange core from slipping out of the positioning groove.

5. The heat recovery fresh air unit with internal circulation defrosting according to claim 1, characterized in that, The surface of the exchange core is provided with a handle to facilitate its removal from the positioning slot.

6. The heat recovery fresh air unit with internal circulation defrosting according to claim 1, characterized in that, The partition plate includes a horizontal portion and a vertical portion, wherein the vertical portion is arranged perpendicular to the horizontal portion.

7. The heat recovery fresh air unit with internal circulation defrosting according to claim 6, characterized in that, The partition plate and the box body are integrally formed.

8. The heat recovery fresh air unit with internal circulation defrosting according to claim 7, characterized in that, The partition plate is provided with a support plate for supporting the installation of the blower and the exhaust fan.

9. The heat recovery fresh air unit with internal circulation defrosting according to claim 8, characterized in that, The installation heights of the blower and the exhaust fan are not on the same horizontal plane.

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