Heat exchange core body and fresh air ventilator

Abstract

The utility model discloses a heat exchange core body and a fresh air ventilator. According to the heat exchange core body, the sectional area of the air channel is gradually increased from the air inlet side to the air outlet side of the heat exchange core body. The heat exchange area of airflow at the tail section of the air duct and the heat exchange core is increased, the air speed is reduced, and the heat exchange efficiency of the tail section of the air duct is improved. The cross section of the heat exchange core body is selected to be in a rhombus shape, the upper portion of the rhombus is formed by two short bevel edges which are in butt joint and represent the fresh air inlet side and the return air inlet side respectively, and the lower portion of the rhombus is formed by two long bevel edges which are in butt joint and correspond to the fresh air outlet side and the return air outlet side. The rhombic section of the heat exchange core body can improve the heat exchange efficiency of the air duct, the position height of the lower edge of the air duct partition plate is not smaller than the height of the top of the fan, and the space where the fan is located is increased. Therefore, wind resistance can be reduced, noise is reduced, and optimization of a wind field is facilitated. And the heat exchange core body and the matched sliding groove structure are arranged to be the conical cylinder structure, so that the heat exchange core body can be easily and conveniently arranged in the sliding groove, and the sealing is reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to a heat exchange core with high heat exchange efficiency and a fresh air ventilator with the heat exchange core. Background Art

[0002] The heat exchange efficiency, the effective ventilation rate and the noise are important indicators for measuring the performance of a fresh air ventilator. These indicators are closely related to the heat exchange core, the air duct flow field and the sealing performance of the fresh air ventilator. As Figure 1 、 Figure 2 shown, the original heat exchange core 01 of the existing fresh air ventilator usually adopts a regular cube, that is, its cross section is a square. The fresh air and return air gas channels are arranged in different layers in the original heat exchange core, that is, the fresh air ducts and the return air ducts arranged in different layers are in a cross structure, and the cross-sectional area of each duct from the air inlet to the air outlet remains unchanged. During installation, the axis of the original heat exchange core 01 is horizontally inserted into the fresh air ventilator, and its cross-sectional area is placed in a rhombus state. As Figure 2 shown, the fresh air and the return air respectively enter from the air ducts on the left and right inclined surfaces at the upper part of the original heat exchange core, and are in a cross-convection state in their respective air ducts. After heat exchange through the duct wall, they are discharged from the air ducts on the corresponding lower side surfaces of the original heat exchange core. Since the cross-sectional areas of the ducts through which the above two gases flow through the original heat exchange core remain unchanged from the inlet to the outlet, the wind speed and the heat exchange area remain unchanged. Therefore, the following problems exist: after the gas passes through the front section of the duct of the original heat exchange core 01 for heat exchange and flows through the end section 02 of the duct, the temperature difference between the fresh air and the return air decreases, so the heat exchange efficiency between the fresh air and the return air decreases; during installation, please refer to Figure 2 , since the cross section of the original heat exchange core is placed in the fresh air ventilator in a rhombus state, a pair of edges of the original heat exchange core are arranged vertically, and the other pair of edges are arranged horizontally. Please refer to Figure 7 shown, at this time, the top of the fresh air fan 9 is usually higher than the intersection edge of the lower edge of the air duct partition 11 and the left edge of the original heat exchange core 01. When the fresh air and the return air are discharged from the corresponding lower left side surface at the lower part of the original heat exchange core after heat exchange, since the lower edge of the air duct partition 11 is lower than the top of the fresh air fan 9, there will be a certain obstruction to the flow of the discharged gas, that is, the upper layer of air flow 12 will generate a relatively sharp V-shaped bending phenomenon when passing through the lower edge of the air duct partition 11, resulting in an unsmooth flow field, an increase in the local resistance of the gas, and an increase in noise. In order to improve the above situation, usually the length of the shell air duct is increased or the size of the fan is reduced, which will cause problems such as whether the installation space is sufficient and whether the performance attenuation meets the requirements.

[0003] In addition, the installation and removal of the original heat exchange core 01 is currently carried out through a slide structure. That is, the original heat exchange core is pushed into or pulled out of the fresh air ventilator through the slide from the side of the inspection door, and a sponge is pasted in the slide for sealing, in order to prevent air leakage from the gap between the original heat exchange core and the slide to improve the effective ventilation rate. Due to the need to ensure sealing, the structural design must be very compact, which makes the friction resistance of the original heat exchange core when sliding in and out large, and the operation is laborious and inconvenient; and the sealing sponge is very easy to be scratched, causing sealing failure.

[0004] Therefore, the existing fresh air ventilator has problems such as reduced heat exchange efficiency, large local wind resistance and high noise, and inconvenient installation and disassembly of the heat exchange core, which easily causes sealing failure. Utility Model Content

[0005] In order to solve the problem of reduced heat exchange efficiency in existing fresh air ventilators, the utility model provides a heat exchange core that can improve the heat exchange efficiency of the end section of the air duct of the heat exchange core and a fresh air ventilator having the heat exchange core. At the same time, the local wind resistance of the heat exchange core can be reduced, and the noise can be reduced; the heat exchange core can be easily assembled and disassembled, and the sealing is reliable.

[0006] The utility model provides a heat exchange core with high heat exchange efficiency, comprising an air duct, characterized in that the cross-sectional area of ​​the air duct gradually increases from the air inlet side to the air outlet side of the heat exchange core.

[0007] Preferably, the cross-sectional shape of the heat exchange core is an asymmetrical rhombus, the upper part of the rhombus is connected by two short oblique sides, representing the air inlet sides of the fresh air and the return air respectively, and the lower part of the rhombus is connected by two long oblique sides, corresponding to the air outlet sides of the fresh air and the return air.

[0008] Preferably, the included angle D between the air inlet surfaces of the fresh air and the return air of the heat exchange core is 110° to 120°.

[0009] Preferably, the heat exchange core is a conical cylinder whose axial cross-sectional area gradually decreases.

[0010] Preferably, the taper angle α of the heat exchange core is 84° to 87°.

[0011] Preferably, a handle is provided on the large end surface of the heat exchange core.

[0012] The utility model also provides a fresh air ventilator, comprising a shell, a fresh air fan and a return air fan, an air duct partition, and a heat exchange core. It is characterized in that the cross-sectional area of ​​the air duct of the heat exchange core gradually expands from the air inlet side to the air outlet side, and the heat exchange core is arranged between the fresh air fan and the return air fan.

[0013] Preferably, the cross-sectional shape of the heat exchange core is a rhombus that is asymmetric up and down. The upper part of the rhombus is formed by butt-jointing two short hypotenuses, representing the air inlet sides of fresh air and return air. The lower part of the rhombus is formed by butt-jointing two long hypotenuses, representing the air outlet sides of fresh air and return air. The height of the position where the air duct partition intersects with the side edge of the heat exchange core is not lower than the tops of the fresh air fan and the return air fan.

[0014] Preferably, the heat exchange core is a conical column with a gradually decreasing cross-sectional area along the axial direction. The chute supporting the heat exchange core is adapted to the shape of the conical column of the heat exchange core. There is an interference fit between the chute and the heat exchange core.

[0015] Preferably, the chute is a V-shaped chute adapted to the edge of the heat exchange core, and the interference amount of the interference fit is 2-3 mm.

[0016] Preferably, elastic chutes capable of pressing the edges of the heat exchange core are provided in the V-shaped chutes on the left and right sides.

[0017] Preferably, the elastic chute includes a bent chute and a torsion spring provided inside the open end of the bent chute. The two sides extended by the torsion spring respectively abut against the inner side surfaces of the bent chute. The open end of the bent chute is located at the inner end of the V-shaped chute, and the bent end of the bent chute is located at the outer end of the V-shaped chute.

[0018] For the heat exchange core of the fresh air ventilator provided by the present utility model, by designing the cross-section of the heat exchange core as a rhombus that is asymmetric between the upper and lower parts, and making the cross-sectional area of the internal air duct of the heat exchange core gradually expand from the air inlet side to the air outlet side, the heat exchange area between the air flow at the end of the air duct and the heat exchange core is increased, and the wind speed is reduced, thereby improving the heat exchange efficiency at the end of the air duct. At the same time, the height of the position where the side edge of the heat exchange core of the present utility model intersects with the air duct partition of the fresh air ventilator is not less than the height of the top of the fan, that is, the lower edge of the air duct partition is slightly raised, and the space where the fan is located is increased. When the upper layer of the fresh air or return air bypasses the lower edge of the air duct partition, it is relatively gentle, and the air flow will not produce a V-shaped turning phenomenon. In this way, the wind resistance can be reduced, the noise can be reduced, and it is beneficial to the optimization of the wind field.

[0019] In addition, the heat exchange core is made into a conical column with a small front end and a large rear end. At the same time, the chute in the fresh air ventilator is also designed to be adapted to the conical column with a rhombus cross-section that is asymmetric up and down. That is, the chute forms a conical structure that gradually narrows from the side of the inspection door to the innermost side of the unit. The chute is usually designed as a V-shaped chute. When the small end of the heat exchange core is pushed into the V-shaped chute, the V-shaped chute is adapted to the upper and lower and left and right pairs of edges of the heat exchange core and forms a slidable interference fit. Such a structural setting makes it easier and more convenient to install the heat exchange core into the chute. When the heat exchange core is completely installed in the unit, it forms a perfect seal with the chute through the interference fit. The chute has a simple structure, reliable cooperation, and good sealing effect. If elastic chutes are provided in the left and right pair of V-shaped chutes, after the heat exchange core is completely pushed into the V-shaped chute, under the elastic extrusion of the elastic chutes, the edges of the heat exchange core are tightly attached to the inner side surfaces of the V-shaped chutes, thus forming an effective seal. Since elastic chutes are provided in the V-shaped chutes, through the elastic extrusion of the elastic chutes, the gap between the V-shaped chutes and the heat exchange core can be automatically eliminated to form a seal, and the pushing and pulling of the heat exchange core in and out is relatively easy. Due to the compensation effect of the elastic chutes, the installation accuracy requirements for the V-shaped chutes are relatively low. The sponge pasting is cancelled in the chute of the present utility model, effectively overcoming the problems of large sponge resistance and easy scratching and air leakage, and at the same time saving the man-hours for pasting and replacing the sponge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional schematic diagram of the original heat exchange core of the prior art;

[0021] Figure 2 is Figure 1 the cross-sectional schematic diagram of;

[0022] Figure 3 is a three-dimensional schematic diagram of the heat exchange core of the embodiment of the present utility model;

[0023] Figure 4 is Figure 3 the three-dimensional schematic diagram of the heat exchange core shown placed horizontally;

[0024] Figure 5 is Figure 4 the cross-sectional schematic diagram of the heat exchange core shown;

[0025] Figure 6 is the path schematic diagram of fresh air flowing through the heat exchange core of the present utility model;

[0026] Figure 7 is the path schematic diagram of fresh air flowing through the original heat exchange core;

[0027] Figure 8 is the position comparison schematic diagram of the original heat exchange core and the heat exchange core of the present utility model simulated and installed in the fresh air ventilator;

[0028] Figure 9 Schematic diagram of the path of fresh air and return air flowing through the fresh air ventilator

[0029] Figure 10 Schematic diagram of the horizontal section of the fresh air ventilator of the present utility model

[0030] Figure 11 Schematic diagram of the longitudinal section of the fresh air ventilator of the present utility model

[0031] Figure 12 Schematic diagram of the installation position relationship between the elastic sliding groove and the left V-shaped sliding groove of the present utility model

[0032] Figure 13 Relationship curve of the included angle D between the air inlet surfaces of fresh air and return air, heat exchange efficiency and air resistance

[0033] Figure 14 Relationship curve of the conical angle α of the heat exchange core and the heat exchange capacity

[0034] In the figure: 01 original heat exchange core, 02 end section of the air duct, 1 heat exchange core, 2 return air inlet, 3 fresh air inlet, 4 handle, 5 fresh air inlet, 6 heat exchange wall body, 7 fresh air outlet, 8 return air fan, 9 fresh air fan, 10 fresh air ventilator, 11 air duct partition, 12 upper air flow, 13 upper air flow layer, 14 return air inlet, 15 return air outlet, 16 side of the inspection door, 17 V-shaped sliding groove, 18 elastic sliding groove, 19 torsion spring, 20 spring plate, 21 pushing direction of the heat exchange core Specific embodiments

[0035] The present utility model will be described in detail below with reference to the accompanying drawings and embodiments

[0036] Please refer to Figures 3 - 5 As shown, the first embodiment of the heat exchange core with high heat exchange efficiency provided by the present utility model. The heat exchange core 1 is a cubic column, and a fresh air duct 3 and a return air duct 2 are provided inside it. Moreover, the fresh air inlet and the return air inlet are respectively arranged on different adjacent surfaces of the heat exchange core, and the fresh air outlet and the return air outlet are respectively arranged on the other two adjacent corresponding surfaces of the heat exchange core. The fresh air duct 3 and the return air duct 2 are arranged axially staggered along the heat exchange core and stacked layer by layer, so that the fresh air duct 3 and the return air duct 2 inside the heat exchange core are hierarchically misaligned and in a cross state. The key is that the cross-sectional areas of the fresh air duct 3 and the return air duct 2 gradually increase from the air inlet side to the air outlet side of the heat exchange core. Please refer to Figure 5As shown in the figure, fresh air enters from the fresh air inlet 5 at the upper right side of the heat exchange core 1 and is discharged from the fresh air outlet 7 at the lower left side of the heat exchange core 1. Moreover, the width of the fresh air outlet 7 is greater than that of the fresh air inlet 5, that is, the cross-sectional area of the fresh air duct 3 gradually expands from the air inlet side to the air outlet side of the heat exchange core. In this embodiment, the heat exchange core can be a column of various shapes, such as a regular cubic column, a regular rhombic cubic column, etc., with simple shapes and convenient manufacturing. As long as it is ensured that the cross-sectional areas of the fresh air duct 3 and the return air duct 2 gradually expand from the air inlet side to the air outlet side, the heat exchange area between the airflows at the end sections of the two ducts and the heat exchange core can be increased, the air velocity can be reduced, and the heat exchange efficiency can be improved.

[0037] The second embodiment of the heat exchange core with high heat exchange efficiency provided by the present invention is as Figures 3 - 5 shown. The cross-sectional shape of the heat exchange core 1 in this embodiment is a rhombus that is asymmetric up and down. As Figure 5 shown, the cross-sectional view of the fresh air duct 3 of the heat exchange core 1 is presented. The upper part of the rhombus is formed by docking two short hypotenuses, which respectively represent the air inlet sides of the fresh air and the return air, that is, the fresh air inlet 5 is arranged on the side surface of the right short hypotenuse, and the return air inlet is arranged on the side surface of the left short hypotenuse; the lower part of the rhombus is formed by docking two long hypotenuses, corresponding to the air outlet sides of the fresh air and the return air, that is, the fresh air outlet 7 is arranged on the side surface of the left long hypotenuse, and the return air outlet is arranged on the side surface of the right long hypotenuse. As Figure 5 shown, the shown rhombus cross-section is formed by docking two short hypotenuses in the upper part and two long hypotenuses in the lower part. Taking the fresh air duct 3 of the heat exchange core 1 as an example, each of the two short hypotenuses in the upper part of the rhombus cross-section in this embodiment is 25 cm, and each of the two long hypotenuses in the lower part is 31 cm. A plurality of fresh air ducts are arranged from the upper right side to the lower left side of the cross-section of the heat exchange core. The width of the fresh air inlet 5 is 2 cm, and the width of the fresh air outlet 7 is 3 cm. Each fresh air duct in the cross-section of the heat exchange core gradually becomes wider from the upper right side to the lower left side, that is, the cross-sectional area of the fresh air duct 3 gradually expands from the air inlet side to the air outlet side. Then, in the return air channels of adjacent layers, the cross-section gradually becomes wider from the upper left side to the lower right side, and the cross-sectional area of the return air duct 2 gradually expands from the air inlet side to the air outlet side. Between the fresh air duct and the return air duct is the heat exchange wall body 6 of the heat exchange core 1. When the fresh air and the return air flow in their respective ducts, cross heat exchange is carried out through these heat exchange wall bodies 6.

[0038] Figure 5The geometric dimensions of the shown rhombic cross-section only represent one structure of this embodiment and do not represent the only limitation. All dimensions can be enlarged or reduced, etc., according to needs. Since the cross-sectional areas of the fresh air duct 3 and the return air duct 2 gradually expand from the air inlet side to the air outlet side, the heat exchange area between the airflows at the end sections of the two ducts and the heat exchange core can be increased, and the air velocity can be reduced, thereby improving the heat exchange efficiency at the end sections of the ducts. In addition, when the heat exchange core with this rhombic cross-section is installed in a fresh air ventilator, the intersection edges between the duct partition and the edges on the left and right sides of the heat exchange core can be raised, which can optimize the air field and reduce the wind resistance.

[0039] As Figure 5 shown, keeping the dimensions of the air inlet surfaces of the fresh air and the return air unchanged, changing the angle D between the fresh air inlet surface and the return air inlet surface, simulating the heat exchange efficiency of the heat exchange core temperature and the air resistance Pa data inside the unit at different angles, as shown in Table 1 below, and organizing them into a curve graph of the angle D between the fresh air inlet surface and the return air inlet surface and the heat exchange efficiency and air resistance ( Figure 13 shown). It can be intuitively found from Table 1 and Figure 13 the curve shown that as the angle D between the fresh air and the return air inlet surfaces increases, the heat exchange efficiency increases. However, after the angle D is greater than 110°, the increasing speed of the heat exchange efficiency slows down (the curve becomes flat), indicating that the influence of the change of the internal duct of the heat exchange core on the increasing speed of the heat exchange efficiency decreases, while the air resistance Pa gradually increases. This is due to the combined factors such as the elevation of the air inlet surface as the angle D becomes larger, the narrowing of the height of the whole machine's air inlet duct, the lengthening of the internal gas passage of the heat exchange core, and the increase of the contact area between the air and the internal gas passage of the core. Although the heat exchange efficiency is still increasing after the angle D exceeds 120°, the increase of the heat exchange efficiency is slow, while the air resistance increases rapidly. This phenomenon is contrary to the goal of this utility model to improve the heat exchange efficiency and at the same time reduce the air resistance. Therefore, the angle D cannot exceed 120°. So the best choice for the angle D between the fresh air inlet surface and the return air inlet surface of the heat exchange core 1 is 110° - 120°. In the design process, the scheme with the best comprehensive performance should be selected according to the actual situation.

[0040] Table 1

[0041]

[0042] η t_nrvu The heat exchange efficiency of temperature (%) can be calculated by the following formula:

[0043] η t_nrvu =(t 22 -t 21 ) / (t 11 -t 21 )

[0044] In the formula:

[0045] ηt_nrvu : Temperature heat exchange efficiency (%)

[0046] t 22 : Dry bulb temperature of fresh air outlet (°C);

[0047] t 21 : Dry bulb temperature of fresh air inlet (°C);

[0048] t 11 : Dry bulb temperature of indoor exhaust air inlet (°C).

[0049] As Figure 4 shown, in this embodiment, the heat exchange core 1 is a conical column with a gradually decreasing cross-sectional area along the axial direction. That is, the cross-section of the heat exchange core gradually narrows from the left end to the right end, forming a conical structure. The slideway supporting the heat exchange core is also designed into a spatial shape adapted to the conical heat exchange core. During installation, the small end of the heat exchange core is pushed into the fresh air ventilator from the inspection door side. This makes the installation and disassembly easy, the sealing reliable, and the maintenance simple.

[0050] As Figure 4 shown, while keeping the maximum cross-sectional area and length dimension of the heat exchange core unchanged, the conical angle α of the heat exchange core is adjusted for simulation analysis. The measured data is shown in Table 2 below, and the relationship curve between the conical angle α of the heat exchange core and the heat exchange amount is sorted out, as Figure 14 shown. It can be found that when α is less than 84°, the heat exchange amount of the unit decreases significantly. This is because the cross-sectional area of the small end of the heat exchange core is too small, resulting in a shorter internal air duct of the heat exchange core and a reduction in the gas heat exchange time. If α is less than 87°, the taper of the heat exchange core 1 is too small, and there is little improvement in the installation and disassembly of the heat exchange core. That is, the preferred conical angle α of the heat exchange core is 84° - 87°. During the design process, the optimal angle scheme can be adjusted and selected according to actual needs.

[0051] Table 2

[0052]

[0053] A handle 4 can also be provided on the large end surface of the heat exchange core 1. So as to facilitate the grasping and installation and disassembly of the heat exchange core.

[0054] Figure 6 As shown is the longitudinal sectional schematic diagram of the fresh air ventilator. The fresh air ventilator provided by the present utility model includes a housing 10, a fresh air fan 9, a return air fan 8, an air duct partition 11, and a heat exchange core 1. The fresh air fan and the return air fan are respectively arranged on both sides of the air outlet part of the heat exchange core. The cross-sectional area of the air duct of the heat exchange core 1 gradually expands from the air inlet side to the air outlet side, so that the heat exchange area between the airflows at the end sections of the fresh air and return air ducts and the heat exchange core increases and the air velocity decreases, thereby improving the heat exchange efficiency at the end section of the air duct.

[0055] For a preferred embodiment of the fresh air ventilator provided by the present utility model, please refer to Figure 5 , the cross-sectional shape of the heat exchange core 1 adopted is a rhombus that is asymmetric up and down. That is, the upper part of the rhombus is the docking of two short hypotenuses, representing the air inlet sides of the fresh air and the return air; the lower part of the rhombus is the docking of two long hypotenuses, corresponding to the air outlet sides of the fresh air and the return air. The height of the position where the air duct partition 11 intersects with the two side edges of the heat exchange core is not lower than the top of the fresh air fan 9 or the return air fan 8. The fresh air enters from the upper right air inlet side of the heat exchange core 1 and is discharged from the lower left air outlet side of the heat exchange core 1. As Figure 6 shown, when the upper layer 13 of the fresh air flow is discharged, it needs to bypass the lower edge of the left air duct partition 11. Since the lower edge of the air duct partition 11 is relatively high, therefore, the discharged upper layer 13 of the air flow flows relatively smoothly, the air field is optimized, the air resistance is reduced, and the noise is reduced. At the same time, the cross-sectional area of the air duct of the heat exchange core 1 gradually expands from the air inlet side to the air outlet side, and the heat exchange area between the air flows at the end sections of the fresh air and return air ducts and the heat exchange core increases, and the air speed decreases, thereby improving the heat exchange efficiency at the end section of the air duct.

[0056] Figure 9 Shown is a schematic diagram of the horizontal cross-section of the fresh air ventilator, which shows the paths of the fresh air and the return air flowing through the fresh air ventilator. The heat exchange core 1 is located between the fresh air fan 9 and the return air fan 8. The fresh air enters from the fresh air inlet 5 at the upper right of the unit and is discharged from the fresh air outlet 7 at the lower left of the unit; the return air enters from the return air inlet 14 at the upper left of the unit and is discharged from the return air outlet 15 at the lower right of the unit. The fresh air and the return air cross-flow from the upper part to the lower part in the heat exchange core 1 for heat exchange to improve the heat exchange efficiency of the air duct.

[0057] Figure 7 Shown is a schematic diagram of the longitudinal cross-section of the fresh air ventilator. The structure is basically the same as that of the fresh air ventilator shown in Figure 6 , the difference is that the existing original heat exchange core 01 is provided in the middle. The cross-section of the original heat exchange core is square. When the fresh air enters from the upper right air inlet side of the original heat exchange core 01 and is discharged from the lower left air outlet side of the original heat exchange core. When the upper layer air flow 12 of the fresh air is discharged, it needs to bypass the lower edge of the left air duct partition 11. Since the lower edge of the air duct partition 11 is relatively low, therefore, when the discharged upper layer air flow 12 bypasses the lower edge of the air duct partition 11, a relatively sharp V-shaped bending phenomenon will occur, resulting in an unsmooth flow field, an increase in the local resistance of the gas, and an increase in the noise.

[0058] As Figure 8As shown in the figure, the existing original heat exchange core 01 (shown by the dashed line) and the heat exchange core 1 with a diamond cross-section of the present invention (shown by the solid line) are schematically arranged in the fresh air ventilator, and the height positions of the two are compared. It can be intuitively seen that for the original heat exchange core 01 of the existing fresh air ventilator, the position (dashed part) where the side edge of its square cross-section intersects with the air duct partition 11 is relatively low, so that the air duct partition blocks the fresh air or the suction of the return air fan, resulting in an unsmooth flow field, large local resistance, and high noise. By using the heat exchange core 1 with a diamond cross-section, the corresponding intersection edges (solid line parts) of the edges on the left and right sides of it with the lower edge of the air duct partition 11 are higher than the height corresponding to the edges on the two sides of the original heat exchange core 01 with a square cross-section and the lower edge of the air duct partition 11. When the fan size is the same, the lower edge of the air duct partition 11 does not block the suction of the fan, the wind field is smoother, which is beneficial to reducing the wind resistance and noise. At the same time, when the whole machine housing remains unchanged, the fan selection can be increased to meet greater air supply and exhaust requirements.

[0059] As Figure 4 and Figure 10 shown, the heat exchange core 1 of the preferred embodiment of the present invention is a conical column with a gradually decreasing cross-sectional area along the axial direction, and the sliding groove supporting the heat exchange core is designed to adapt to the spatial shape of the conical column of the heat exchange core. That is, the space structure gradually narrowing from the outside to the inside is formed between the four sliding grooves, and it corresponds to the outer shape of the heat exchange core 1. The sliding groove and the heat exchange core are in an interference fit. Due to the conical structures of the heat exchange core and the sliding groove, during the process of installing the heat exchange core into the sliding groove, the size of each cross-section position of the heat exchange core is always smaller than the distance between the corresponding sliding grooves, thus reducing the frictional resistance of the heat exchange core during the installation process. Only when the heat exchange core is completely pushed into the sliding groove, that is, after the installation is completed, the gap between the outer shape of the heat exchange core and the sliding groove disappears, forming a good seal. Please refer to Figure 11 , in this embodiment, a V-shaped sliding groove 17 is adopted for one kind of sliding groove, with a V-shaped sliding groove provided above and below and left and right respectively, and it corresponds and adapts to the edges on the upper, lower, left and right of the heat exchange core 1. The interference amount is preferably 2-3 mm according to the empirical tolerance. If the interference amount is too small, it is difficult to ensure the sealing performance. If the interference amount is too large, it is difficult to ensure that the heat exchange core is installed in place. After the heat exchange core is completely installed, it directly forms a seal with the sliding groove by extrusion. According to needs, the specific structure of the sliding groove in this embodiment can be changed as long as the same sealing effect can be achieved and it is convenient to pull out and push in the heat exchange core.

[0060] In this embodiment, in addition to having beneficial effects such as improved heat exchange efficiency, reduced local wind resistance, and reduced noise, when the small end of the heat exchange core is pushed in or pulled out from the maintenance door side, it is easy and labor-saving, the seal is reliable, and the maintenance is simple. It effectively solves the problems of large resistance of the sealing sponge and easy scratching and air leakage.

[0061] As Figure 11As shown, in the left and right V-shaped sliding grooves 17 of this embodiment, an elastic sliding groove 18 capable of pressing against the edge of the heat exchange core 1 can also be provided. As Figure 12 shown, the elastic sliding groove 18 includes a bent sliding groove 20. A torsion spring 19 is provided inside the open end of the bent sliding groove. The two sides extended by the torsion spring 19 respectively abut against the inner side surfaces of the bent sliding groove 20. The open end of the bent sliding groove is located at the inner end of the V-shaped sliding groove 17, while the bent end of the bent sliding groove is located at the outer end of the V-shaped sliding groove 17. Usually, the elastic sliding groove 18 is fixedly connected to the inner surface of the upper side of the V-shaped sliding groove 17. After the small end of the heat exchange core 1 is pushed into the unit along the pushing direction 21 from the maintenance door side, a seal is formed between the heat exchange core and the elastic sliding groove through interference fit. That is, the elastic sliding groove 18 directly presses the heat exchange core through the elastic force of the torsion spring 19 therein by the outer surface of the bent sliding groove 20 to form a reliable seal. Of course, the elastic sliding groove 18 can also be fixed to the inner surface of the lower side of the V-shaped sliding groove 17. In this way, it is easier and more labor-saving to push and pull the heat exchange core, but the load on the elastic sliding groove is larger and the elastic force is likely to be reduced. In the sliding groove of this embodiment, pasting sponge is cancelled, and the seal is formed by the extrusion of the elastic sliding groove, which is stable, reliable, easy and labor-saving.

[0062] For technologies, methods and devices known to those of ordinary skill in the relevant art, no detailed discussion is made in this specification, but in appropriate cases, the said technologies, methods and devices should be regarded as part of this specification. Any specific value in this specification should be interpreted as merely exemplary and not as a limitation to the present invention.

[0063] The above are only the specific embodiments of the present invention. It should be noted that any modifications, equivalent substitutions and changes made within the spirit and framework of the concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat exchange core, comprising an air duct, characterized in that: The cross-sectional area of ​​the air duct gradually increases from the air inlet side to the air outlet side of the heat exchange core.

2. The heat exchange core according to claim 1, characterized in that: The cross-sectional shape of the heat exchange core is a rhombus that is asymmetrical up and down, the upper part of the rhombus is connected by two short oblique sides, representing the air inlet sides of the fresh air and the return air respectively, and the lower part of the rhombus is connected by two long oblique sides, corresponding to the air outlet sides of the fresh air and the return air.

3. The heat exchange core according to claim 2, characterized in that: The included angle D between the fresh air inlet surface and the return air inlet surface of the heat exchange core is 110° to 120°.

4. The heat exchange core according to claim 2, characterized in that: The heat exchange core is a conical column with a gradually decreasing axial cross-sectional area.

5. The heat exchange core according to claim 4, characterized in that: The taper angle α of the heat exchange core is 84° to 87°.

6. The heat exchange core according to claim 4, characterized in that: A handle is provided on the large end surface of the heat exchange core.

7. A fresh air ventilator, comprising a housing, a fresh air fan and a return air fan, an air duct partition, and a heat exchange core, characterized in that: The cross-sectional area of ​​the air duct of the heat exchange core gradually increases from the air inlet side to the air outlet side, and the heat exchange core is arranged between the fresh air fan and the return air fan.

8. The fresh air ventilator according to claim 7, characterized in that: The cross-sectional shape of the heat exchange core is an asymmetrical rhombus, the upper part of the rhombus is connected by two short oblique sides, indicating the air inlet side of the fresh air and the return air, and the lower part of the rhombus is connected by two long oblique sides, indicating the air outlet side of the fresh air and the return air; the height of the position where the air duct partition intersects with the side edge of the heat exchange core is not lower than the top of the fresh air fan and the return air fan.

9. The fresh air ventilator according to claim 8, characterized in that: The heat exchange core is a tapered column with a gradually reduced axial cross-sectional area, and the slide groove supporting the heat exchange core is adapted to the shape of the tapered column of the heat exchange core; the slide groove and the heat exchange core are in interference fit.

10. The fresh air ventilator according to claim 9, characterized in that: The slide groove is a V-shaped slide groove adapted to the edge of the heat exchange core, and the interference fit is 2 to 3 mm.

11. The fresh air ventilator according to claim 10, characterized in that: Elastic slide grooves capable of pressing the edges of the heat exchange core are arranged in the V-shaped slide grooves on the left and right sides.

12. The fresh air ventilator according to claim 11, characterized in that: The elastic slide groove includes a bending slide groove, a torsion spring arranged in the open end of the bending slide groove, and the two side edges of the torsion spring respectively abut against the two inner side surfaces of the bending slide groove; the open end of the bending slide groove is located at the inner end of the V-shaped slide groove, and the bending end of the bending slide groove is located at the outer end of the V-shaped slide groove.

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