Air duct machine

Abstract

The present invention provides an air duct machine, comprising: a housing, on which a side air outlet is formed; a fan, which is arranged inside the housing; the fan has an air suction port and an air discharge port, and the minimum distance between the air suction port and the air discharge port is H2. For the air duct machine provided by the present invention, by defining the ratio of the distance between the air suction port and the air discharge port of the fan to the distance between the air suction port and the side air outlet or the ratio to the distance between the air discharge port and the side air outlet, the installation position of the fan is reasonably determined, and a suitable internal structure distribution ratio of the air duct machine is found, so as to avoid that the limited housing space will seriously restrict the performance of the fan and the air duct machine, thereby effectively reducing the noise. On the premise of not affecting the performance of the air duct machine, the housing size is maximally streamlined, the design cost of the air duct machine is reduced, and the aesthetics of the air duct machine is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of air handling equipment, and particularly to an air duct machine. Background Art

[0002] An air duct machine is a type of air conditioner. To improve comfort, some air duct machines adopt the method of blowing cold air from the top and hot air from the bottom, which can achieve waterfall cooling and carpet - style warm air. To achieve this air - outlet method, the air outlet of the air duct machine needs to be reversible. In existing reversible - air - outlet air duct machines, cross - flow fans or centrifugal fans are usually used. However, due to the problem of the setting method of the fan blades, the wind direction cannot be reversed after the fan rotates. Therefore, at least two fans need to be set, one responsible for forward air outlet and the other responsible for reverse air outlet. This not only makes the structure of the air duct machine larger but also increases the cost.

[0003] To reduce costs, the fan needs to be made smaller. A mixed - flow fan is a fan between an axial - flow fan and a centrifugal fan. The impeller of the mixed - flow fan makes the air move both centrifugally and axially, and the air flow movement in the volute mixes the axial and centrifugal movement forms, so it is called "mixed - flow". Moreover, the mixed - flow fan can not only be made smaller in size but also ensure the air flow direction and air pressure.

[0004] However, the air intake of the impeller of the mixed - flow fan is extremely vulnerable to the influence of the external air duct. Unreasonable air intake conditions and complex external air flow environments will affect the work performance of the impeller, thereby affecting the air volume of the air duct machine and generating noise. Summary of the Invention

[0005] An air duct machine is provided in an embodiment of the present invention to solve the problem of poor air - outlet effect of the fan in the existing air duct machine.

[0006] An air duct machine includes:

[0007] A housing, on which a side air outlet is formed;

[0008] A fan, which is arranged inside the housing;

[0009] The fan has an air suction port and an air discharge port, and the distance between the air suction port and the air discharge port is H2;

[0010] The air suction port faces the side air outlet, the distance between the air suction port and the side air outlet is H1, and the ratio range between H1 and H2 is 0.25 ≤ H1 / H2 ≤ 0.34;

[0011] Or, the air discharge port faces the side air outlet, the minimum distance between the air discharge port and the side air outlet is H1, and the ratio range between H1 and H2 is 0.25 ≤ H1 / H2 ≤ 0.34.

[0012] The air duct machine further includes a heat exchanger, the heat exchanger is disposed within the housing, the blower is located between the heat exchanger and the side air outlet. When the air inlet faces the side air outlet, the air outlet faces the heat exchanger, and the minimum distance between the air outlet and the heat exchanger is H3, and the ratio range between H2 and H3 is 0.33 ≤ H3 / H2 ≤ 0.42; or, when the air outlet faces the side air outlet, the air inlet faces the heat exchanger, and the minimum distance between the air inlet and the heat exchanger is H3, and the ratio range between H2 and H3 is 0.33 ≤ H3 / H2 ≤ 0.42.

[0013] A lower air outlet is further formed on the housing, the air duct machine further includes a heat exchanger, the heat exchanger is located between the blower and the lower air outlet. When the air inlet faces the side air outlet, the air outlet faces the heat exchanger, and the difference between the minimum distance between the air outlet and the lower air outlet and the minimum distance between the air outlet and the heat exchanger is H4, and the ratio range between H4 and H3 is 0.60 ≤ H3 / H4 ≤ 0.72; or, when the air outlet faces the side air outlet, the air inlet faces the heat exchanger, and the difference between the minimum distance between the air inlet and the lower air outlet and the minimum distance between the air inlet and the heat exchanger is H4, and the ratio range between H4 and H3 is 0.60 ≤ H3 / H4 ≤ 0.72.

[0014] The cross-section of the heat exchanger is V-shaped, and the sharp angle of the V-shape faces the blower.

[0015] The blower is rotatably disposed within the housing, and the blower has a first orientation in which the air inlet faces the side air outlet and a second orientation in which the air outlet faces the side air outlet.

[0016] A lower air outlet is further formed on the housing. When the blower is in the first orientation, the side air outlet serves as the air inlet of the air duct machine, and the lower air outlet serves as the air outlet of the air duct machine. When the blower is in the second orientation, the side air outlet serves as the air outlet of the air duct machine, and the lower air outlet serves as the air inlet of the air duct machine.

[0017] The housing has a bottom surface and a side surface, the lower air outlet is disposed on the bottom surface, and the side air outlet is disposed on the side surface.

[0018] The blower is a mixed-flow blower.

[0019] The outer surface of the volute of the blower is a curved surface.

[0020] The volute is a spherical frustum structure, the air inlet and the air outlet are respectively disposed at two end faces of the spherical frustum structure, and the distance between the two end faces of the spherical frustum structure is H2.

[0021] The air duct machine provided by the present invention determines the installation position of the fan reasonably by defining the ratio of the distance between the air suction port and the air discharge port of the fan to the distance between the air suction port and the side air outlet or the ratio to the distance between the air discharge port and the side air outlet, finds a suitable internal structure distribution ratio of the air duct machine, so as to avoid that the limited space of the housing severely restricts the performance of the fan and the air duct machine, thereby effectively reducing noise, and on the premise of not affecting the performance of the air duct machine, minimizing the size of the housing to the greatest extent, reducing the design cost of the air duct machine, and ensuring the beauty of the air duct machine. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of an air duct machine with the air suction port of the fan facing the side air outlet provided by an embodiment of the present invention;

[0023] Figure 2 It is a schematic structural diagram of an air duct machine with the air discharge port of the fan facing the side air outlet provided by an embodiment of the present invention;

[0024] In the figure:

[0025] 1. Housing; 12. Side air outlet; 2. Fan; 21. Air suction port; 22. Air discharge port; 3. Heat exchanger; 11. Lower air outlet. Detailed Embodiment

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] As Figure 1 and Figure 2 shown, the present invention discloses an air duct machine, including: a housing 1, on which a side air outlet 12 is formed; a fan 2, which is arranged in the housing 1; the fan 2 has an air suction port 21 and an air discharge port 22, and the minimum distance between the air suction port 21 and the air discharge port 22 is H2; the air suction port 21 faces the side air outlet 12, and the distance between the air suction port 21 and the side air outlet 12 is H1, and the ratio range between H1 and H2 is 0.25 ≤ H1 / H2 ≤ 0.34. By defining the ratio of the distance between the air suction port 21 and the air discharge port 22 of the fan 2 to the distance between the air suction port 21 and the side air outlet 12, the installation position of the fan 2 is determined reasonably, and a suitable internal structure distribution ratio of the air duct machine is found, so as to avoid that the limited space of the housing 1 severely restricts the performance of the fan 2 and the air duct machine, thereby effectively reducing noise, and on the premise of not affecting the performance of the air duct machine, minimizing the size of the housing 1 to the greatest extent, reducing the design cost of the air duct machine, and ensuring the beauty of the air duct machine.

[0028] Among them, the minimum distance H2 between the air inlet 21 and the air outlet 22 of the fan 2 refers to the minimum distance between the edge of the air inlet 21 and the edge of the air outlet 22. When the plane where the air inlet 21 is located is parallel to the plane where the air outlet 22 is located, the minimum distance H2 between the air inlet 21 and the air outlet 22 of the fan 2 refers to the distance between the plane where the air inlet 21 is located and the plane where the air outlet 22 is located. The minimum distance H2 between the air inlet 21 and the side air outlet 12 refers to the minimum distance between the edge of the air inlet 21 and the edge of the side air outlet 12. When the plane where the air inlet 21 is located is parallel to the plane where the side air outlet 12 is located, the minimum distance H1 between the air inlet 21 and the side air outlet 12 refers to the distance between the plane where the air inlet 21 is located and the plane where the side air outlet 12 is located.

[0029] Perform a simulation test on the air duct machine in this example, change the ratio of H1 and H2, and the simulation results are as follows:

[0030]

[0031] According to the simulation data, when H1 / H2 is 0.28, although the air volume does not reach the maximum value, the relative noise value is relatively small. When H1 / H2 decreases to 0.25, although the air volume begins to increase and the noise also increases, and the positive effect brought by the increase in air volume is far less than the negative effect brought by the noise. When H1 / H2 continues to decrease to 0.13, although the air volume continues to increase, the increase in noise is even greater and the negative effect becomes stronger. When H1 / H2 increases to 0.34, the air volume begins to decrease and the noise also decreases, but the negative effect brought by the decrease in air volume is far less than the positive effect brought by the decrease in noise. When H1 / H2 continues to increase to 0.40, the air volume continues to decrease, but the noise value does not continue to decrease accordingly. That is to say, the larger the value of H1 / H2, the farther the distance between the fan 2 and the side air outlet 12, which will waste the space of the housing 1 to a certain extent. At the same time, when the air volume decreases, the noise will not decrease accordingly. When the value of H1 / H2 is smaller, it means that the distance between the fan 2 and the side air outlet 12 is closer. Although the air volume increases, the noise will become louder, which is not conducive to noise reduction of the unit.

[0032] As another implementation method, such as Figure 2As shown, the difference from the previous embodiment is that: the exhaust port 22 faces the side air outlet 12, the minimum distance between the exhaust port 22 and the side air outlet 12 is H5, and the ratio range between H5 and H2 is 0.25 ≤ H5 / H2 ≤ 0.34. By defining the distance between the air inlet 21 and the exhaust port 22 of the fan 2 and the distance between the exhaust port 22 and the side air outlet 12, the installation position of the fan 2 is reasonably determined, and the internal structure distribution ratio of the appropriate air duct machine is found, so as to avoid severely restricting the performance of the fan 2 and the air duct machine in the limited space of the housing 1, thereby effectively reducing noise. On the premise of not affecting the performance of the air duct machine, the size of the housing 1 is maximally streamlined, the design cost of the air duct machine is reduced, and the beauty of the air duct machine is ensured.

[0033] Among them, the minimum distance H2 between the air inlet 21 and the exhaust port 22 of the fan 2 refers to the minimum distance between the edge of the air inlet 21 and the edge of the exhaust port 22. When the plane where the air inlet 21 is located is parallel to the plane where the exhaust port 22 is located, the minimum distance H1 between the air inlet 21 and the exhaust port 22 of the fan 2 refers to the distance between the plane where the air inlet 21 is located and the plane where the exhaust port 22 is located. The minimum distance H1 between the exhaust port 22 and the side air outlet 12 refers to the minimum distance between the edge of the exhaust port 22 and the edge of the side air outlet 12. When the plane where the exhaust port 22 is located is parallel to the plane where the side air outlet 12 is located, the minimum distance H1 between the exhaust port 22 and the side air outlet 12 refers to the distance between the plane where the exhaust port 22 is located and the plane where the side air outlet 12 is located.

[0034] The air duct machine further includes a heat exchanger 3. The heat exchanger 3 is disposed in the housing 1. The fan 2 is located between the heat exchanger 3 and the side air outlet 12. When the air inlet 21 faces the side air outlet 12, the exhaust port 22 faces the heat exchanger 3, and the minimum distance between the exhaust port 22 and the heat exchanger 3 is H3, and the ratio range between H2 and H3 is 0.33 ≤ H3 / H2 ≤ 0.42.

[0035] Among them, the minimum distance H3 between the exhaust port 22 and the heat exchanger 3 refers to the minimum value of the vertical distance from any point on the heat exchanger 3 to the plane where the exhaust port 22 is located.

[0036] Perform a simulation test on the air duct machine in this example, change the ratio between H2 and H3, and the simulation results are as follows:

[0037]

[0038]

[0039] According to the simulation data, when H3 / H2 is 0.39, the air volume reaches the maximum value and the noise reaches the minimum value. When H3 / H2 decreases to 0.33, the air volume begins to decrease and the noise begins to increase. When H3 / H2 continues to decrease to 0.28, the air volume continues to decrease and the noise continues to increase. At this time, the air volume cannot ensure that the heat exchange efficiency of the air duct machine reaches the set value. When H3 / H2 increases to 0.42, the air volume and the noise begin to decrease simultaneously. When H3 / H2 continues to increase to 0.5, the air volume and the noise further decrease. At this time, the air volume cannot ensure that the heat exchange efficiency of the air duct machine reaches the set value. That is, the smaller the value of H3 / H2, the closer the distance between the heat exchanger 3 and the fan 2. At this time, the heat exchanger 3 will generate resistance to the inlet and outlet air of the fan 2, resulting in a decrease in the air volume. At the same time, the probability of water blowing will increase to some extent. And the exhaust air of the fan 2 will directly blow on the heat exchanger 3. The high-speed air flow passing through the fins of the heat exchanger 3 will introduce a noise source. When the value of H3 / H2 is larger, although the air volume and the noise both begin to decrease, the air volume at this time cannot ensure that the heat exchange efficiency of the air duct machine reaches the set value. Moreover, it will waste the space of the housing 1 to a certain extent and increase the flow resistance, further causing the attenuation of the air volume.

[0040] As another implementation manner, as Figure 2 shown, the difference from the previous implementation manner is that when the air outlet 22 faces the side air outlet 12, the air inlet 21 faces the heat exchanger 3, and the minimum distance between the air inlet 21 and the heat exchanger 3 is H6, and the ratio range between H2 and H6 is 0.33 ≤ H6 / H2 ≤ 0.42.

[0041] Among them, the minimum distance H3 between the air outlet 22 and the heat exchanger 3 refers to the minimum value of the vertical distance from any point on the heat exchanger 3 to the plane where the air outlet 22 is located.

[0042] A lower air outlet 11 is further formed on the housing 1. The air duct machine further includes a heat exchanger 3. The heat exchanger 3 is located between the fan 2 and the lower air outlet 11. When the air inlet 21 faces the side air outlet 12, the air outlet 22 faces the heat exchanger 3, and the difference between the minimum distance between the air outlet 22 and the lower air outlet 11 and the minimum distance between the air outlet 22 and the heat exchanger 3 is H4, and the ratio range between H4 and H3 is 0.60 ≤ H3 / H4 ≤ 0.72.

[0043] Among them, the minimum distance between the lower air outlet 11 and the air outlet 22 refers to the minimum value of the vertical distance from the edge of the lower air outlet 11 close to the fan 2 to the plane where the air outlet 22 is located. When the air outlet 22 is parallel to the vertical plane and the lower air outlet 11 is parallel to the horizontal plane, the minimum distance between the lower air outlet 11 and the air outlet 22 refers to the vertical distance from the edge of the lower air outlet 11 close to the fan 2 to the vertical plane where the air outlet 22 is located.

[0044] Perform a simulation test on the air duct machine in this example, change the value of H3 / H4, and the simulation results are as follows:

[0045]

[0046] According to the simulation data, when H3 / H4 is 0.66, the air volume reaches the maximum value and the noise reaches the minimum value. When H3 / H4 increases to 0.72, the air volume begins to decrease and the noise begins to increase. When H3 / H4 continues to increase to 0.82, the air volume continues to decrease and the noise continues to increase. At this time, the air volume cannot meet the requirement that the heat exchange efficiency of the air duct machine reaches the set value, and the noise value is too large, which is not conducive to noise reduction of the air duct machine. When H3 / H4 decreases to 0.60, the air volume begins to decrease and the noise begins to increase. When H3 / H4 continues to decrease to 0.5, the air volume continues to decrease and the noise continues to increase. At this time, the air volume cannot meet the requirement that the heat exchange efficiency of the air duct machine reaches the set value, and the noise value is too large, which is not conducive to noise reduction of the air duct machine. Among them, the value of H3 / H4 will directly affect the placement space and angle of the unit heat exchanger 3. When the value of H3 / H4 is large, it means that the placement space of the heat exchanger 3 is small, the placement space of the heat exchanger 3 is compressed, and its distance from the fan is increased, resulting in an increase in the internal flow loss of the unit, and the air volume will be attenuated, which is not conducive to the improvement of the unit capacity. Moreover, the increase in the distance between the heat exchanger 3 and the fan will exacerbate the flow turbulence between the two, which is not conducive to noise reduction and the improvement of the air duct machine capacity. When the value of H3 / H4 is small, it means that the placement space of the heat exchanger 3 is large, the heat exchanger 3 is close to the fan, the air flow at the fan outlet cannot fully expand, and impacts the fin structure of the heat exchanger 3 at a high speed, resulting in air volume attenuation and noise increase. At the same time, a larger housing 1 is required, which will increase the unit cost and reduce the aesthetics.

[0047] As another implementation manner, as Figure 2 shown, the difference from the previous implementation manner is that when the air outlet 22 faces the side air outlet 12, the air inlet 21 faces the heat exchanger 3, and the difference between the minimum distance between the air inlet 21 and the lower air outlet 11 and the minimum distance between the air inlet 21 and the heat exchanger 3 is H7, and the ratio range between H7 and H3 is 0.60 ≤ H3 / H7 ≤ 0.72.

[0048] The minimum distance between the lower air outlet 11 and the air inlet 21 refers to the minimum value of the vertical distance from the edge of the lower air outlet 11 close to the fan 2 to the plane where the air inlet 21 is located. When the air inlet 21 is parallel to the vertical plane and the lower air outlet 11 is parallel to the horizontal plane, the minimum distance between the lower air outlet 11 and the air inlet 21 refers to the vertical distance from the edge of the lower air outlet 11 close to the fan 2 to the vertical plane where the air inlet 21 is located.

[0049] The cross-section of the heat exchanger 3 is V-shaped, and the sharp angle of the V-shape faces the blower 2.

[0050] The blower 2 is rotatably arranged in the housing 1, and the blower 2 has a first orientation with the air inlet 21 facing the side air outlet 12 and a second orientation with the air outlet 22 facing the side air outlet 12.

[0051] A lower air outlet 11 is further formed on the housing 1. When the blower 2 is in the first orientation, the side air outlet 12 serves as the air inlet of the air duct machine, and the lower air outlet 11 serves as the air outlet of the air duct machine. When the blower 2 is in the second orientation, the side air outlet 12 serves as the air outlet of the air duct machine, and the lower air outlet 11 serves as the air inlet of the air duct machine.

[0052] In the heating mode of the air duct machine, the lower air outlet 11 discharges air, the side air outlet 12 intakes air, and the air outlet 22 of the blower 2 faces the heat exchanger 3. The gas outside the housing 1 is sucked in by the side air outlet 12 under the action of the blower 2 and sequentially passes through the blower 2 and the heat exchanger 3 to be heated and then discharged from the lower air outlet 11 of the housing 1, so as to achieve the effect of rapid heating.

[0053] In the cooling mode of the air duct machine, the lower air outlet 11 intakes air, the side air outlet 12 discharges air, and the air inlet 21 of the blower 2 faces the heat exchanger 3. The gas outside the housing 1 is sucked in by the lower air outlet 11 under the action of the blower 2 and sequentially passes through the heat exchanger 3 for cooling and the blower 2 and then discharged from the side air outlet 12 of the housing 1, so as to achieve the effect of waterfall cooling.

[0054] The blower 2 is a mixed-flow blower.

[0055] The blower 2 includes a volute and an impeller. The impeller is arranged in the volute. The air inlet 21 and the air outlet 22 are both located on the volute. The air inlet 21 is located on the air inlet side of the impeller, and the air outlet 22 is located on the air outlet side of the impeller. That is, the air inlet 21 and the air outlet 22 are respectively distributed on both sides of the impeller, and the air inlet at the air inlet 21 is discharged from the air outlet 22 under the action of the impeller.

[0056] The blower 2 has a spherical table structure. The air inlet 21 and the air outlet 22 are respectively arranged at the two end faces of the spherical table structure, and the distance between the two end faces of the spherical table structure is H2. That is, the plane where the air inlet 21 is located is parallel to the plane where the air outlet 22 is located.

[0057] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended claims.

Claims

1. An air duct machine, characterized in that: Comprising: A housing (1) with a side air outlet (12) formed thereon; A fan (2) disposed within the housing (1); The fan (2) has an air inlet (21) and an air outlet (22), and the distance between the air inlet (21) and the air outlet (22) is H2; The air inlet (21) faces the side air outlet (12), the distance between the air inlet (21) and the side air outlet (12) is H1, and the ratio range between H1 and H2 is 0.25 ≤ H1 / H2 ≤ 0.34; Or, the air outlet (22) faces the side air outlet (12), the distance between the air outlet (22) and the side air outlet (12) is H5, and the ratio range between H5 and H2 is 0.25 ≤ H5 / H2 ≤ 0.

34.

2. The air duct machine according to claim 1, wherein: The air duct unit further includes a heat exchanger (3) disposed within the housing (1), the fan (2) is located between the heat exchanger (3) and the side air outlet (12). When the air inlet (21) faces the side air outlet (12), the air outlet (22) faces the heat exchanger (3), and the minimum distance between the air outlet (22) and the heat exchanger (3) is H3, and the ratio range between H2 and H3 is 0.33 ≤ H3 / H2 ≤ 0.42; or when the air outlet (22) faces the side air outlet (12), the air inlet (21) faces the heat exchanger (3), and the minimum distance between the air inlet (21) and the heat exchanger (3) is H6, and the ratio range between H2 and H6 is 0.33 ≤ H6 / H2 ≤ 0.

42.

3. The air duct machine according to claim 1, wherein: The housing (1) further has a lower air outlet (11), the air duct unit further includes a heat exchanger (3), the heat exchanger (3) is located between the fan (2) and the lower air outlet (11). When the air inlet (21) faces the side air outlet (12), the air outlet (22) faces the heat exchanger (3), and the minimum distance between the air outlet (22) and the heat exchanger (3) is H3, the difference between the minimum distance between the air outlet (22) and the lower air outlet (11) and the minimum distance between the air outlet (22) and the heat exchanger (3) is H4, and the ratio range between H4 and H3 is 0.60 ≤ H3 / H4 ≤ 0.72; or when the air outlet (22) faces the side air outlet (12), the air inlet (21) faces the heat exchanger (3), and the difference between the minimum distance between the air inlet (21) and the lower air outlet (11) and the minimum distance between the air inlet (21) and the heat exchanger (3) is H7, and the ratio range between H7 and H3 is 0.60 ≤ H3 / H7 ≤ 0.

72.

4. The air duct machine according to claim 2 or 3, characterized in that: The cross-section of the heat exchanger (3) is V-shaped, and the sharp angle of the V shape faces the fan (2).

5. The air duct machine according to claim 1, characterized in that: The blower (2) is rotatably arranged in the housing (1), and the blower (2) has a first orientation with the air inlet (21) facing the side air outlet (12) and a second orientation with the air outlet (22) facing the side air outlet (12).

6. The air duct machine according to claim 5, characterized in that: A lower air outlet (11) is further formed on the housing (1). When the blower (2) is in the first orientation, the side air outlet (12) serves as the air inlet of the air duct machine, and the lower air outlet (11) serves as the air outlet of the air duct machine. When the blower (2) is in the second orientation, the side air outlet (12) serves as the air outlet of the air duct machine, and the lower air outlet (11) serves as the air inlet of the air duct machine.

7. The air duct machine according to claim 6, characterized in that: The housing (1) has a bottom surface and a side surface. The lower air outlet (11) is arranged on the bottom surface, and the side air outlet (12) is arranged on the side surface.

8. The air duct machine according to claim 1, wherein: The blower (2) is a mixed-flow blower.

9. The air duct machine according to claim 1, characterized in that: The outer surface of the volute of the blower (2) is a curved surface.

10. The air duct machine according to claim 9, characterized in that: The volute is a frustum of a sphere structure. The air inlet (21) and the air outlet (22) are respectively arranged at the two end faces of the frustum of a sphere structure, and the distance between the two end faces of the frustum of a sphere structure is H2.

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