Air conditioning space generation system

Abstract

This technology provides a way to create an air-conditioned environment in outdoor settings or indoor open spaces. [Solution] The first housing 40 houses the air conditioner 200. The second housing 46 is connected to the first housing 40. The protruding plate 4a is positioned on the upper side of the second housing 46 and protrudes toward the front. The extension plate 4b extends downward from the front end of the protruding plate 4a. The front side of the second housing 46 is provided with a cooling outlet 12 that blows air from the air conditioner 200 toward the front. The first housing 40 is provided with an intake port 13 below the cooling outlet 12 that draws in air from the outside. The air blown out from the cooling outlet 12 travels toward the front along the protruding plate 4a and then travels toward the downward along the extension plate 4b. If the length from the protruding plate 4a to the upper end of the cooling outlet 12 is h1, and the length from the upper end to the lower end of the cooling outlet 12 is h2, then h1

Description

Technical Field

[0001] The present disclosure relates to an air-conditioned space generation system.

Background Art

[0002] In order to efficiently heat and cool each work area in a factory, an indoor unit and a human presence sensor are provided in each work area, and when the presence of a person is detected by the human presence sensor, the indoor units are operated in the order of detection (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When an air conditioner is operated, air is blown out from the air conditioner, so that the air can be received in the vicinity of the air conditioner. However, simply blowing out air from the air conditioner does not generate an air-conditioned space in an open space.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a technique for generating an air-conditioned space in an outdoor environment or an indoor open space or the like.

Means for Solving the Problems

[0006] To solve the above problems, an air-conditioned space generation system in one aspect of the present disclosure comprises an air conditioner capable of cooling operation, a hollow first housing housing the air conditioner, a hollow second housing connected to the first housing, a protruding plate positioned on the upper side of the second housing and projecting forward, and an extension plate extending downward from the front end of the protruding plate. The internal space of the first housing and the internal space of the second housing are in communication, a cooling outlet is provided on the front side of the second housing for blowing air blown out from the air conditioner forward, and the first housing is provided with an intake port below the cooling outlet for drawing in air from the outside, and the air blown out from the cooling outlet moves forward along the protruding plate and then downward along the extension plate, and when the length from the protruding plate to the upper end of the cooling outlet is h1 and the length from the upper end to the lower end of the cooling outlet is h2, h1 <h2である。

[0007] Furthermore, any combination of the above components, as well as any conversion of the expressions of this disclosure between methods, apparatus, systems, recording media, computer programs, etc., are also valid forms of this disclosure. [Effects of the Invention]

[0008] According to this disclosure, it is possible to create an air-conditioned space in outdoor environments or indoor open spaces. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing the external appearance of the air-conditioned space generation system according to this embodiment. [Figure 2] Figure 2 is a perspective view showing a cross-section of the air conditioning space generation system shown in Figure 1. [Figure 3] Figure 3 is a perspective view showing a cross-section of the air conditioning space generation system shown in Figure 1. [Figure 4] Figure 4 is a perspective view showing a cross-section of the air conditioning space generation system shown in Figure 1. [Figure 5] Figure 5 is a perspective view showing a cross-section of the air conditioning space generation system shown in Figure 1. [Figure 6] Figure 6 is a perspective view showing a cross-section of the air conditioning space generation system shown in Figure 1. [Figure 7] Figure 7 is a perspective view showing a cross-section of an air-conditioned space generation system according to a modified example. [Figure 8] Figure 8 is a perspective view showing a cross-section of the air conditioning space generation system shown in Figure 1. [Figure 9] Figure 9 is a perspective view showing a cross-section of the air conditioning space generation system shown in Figure 1. [Modes for carrying out the invention]

[0010] The embodiments described below all represent preferred specific examples of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangement and connection configurations of components, as well as the steps (processes) and their order shown in the following embodiments are examples and are not intended to limit the present disclosure. Accordingly, among the components in the following embodiments, those components that are not described in the independent claims representing the highest-level concepts of the present disclosure will be described as optional components. In addition, substantially identical components are denoted by the same reference numerals in each figure, and redundant explanations are omitted or simplified.

[0011] In the following, this embodiment will be described in the following order: (1) the appearance of the air-conditioned space generation system 1, (2) cooling operation by the air-conditioned space generation system 1, (3) heating operation by the air-conditioned space generation system 1, (4) modified examples, and (5) the size of the air-conditioned space generation system 1.

[0012] (1) Appearance of the air conditioning space generation system 1 Figure 1 is a perspective view showing the external appearance of the air-conditioned space generation system 1. The air-conditioned space generation system 1 includes a back wall 3, a deflection plate 4, chairs 6, an air conditioning unit 7, and a base 8. The back wall 3 is a rectangular plate. One or more chairs 6 are arranged in the space in front of the back wall 3, and an air conditioning unit 7 is arranged behind the chairs 6 and in front of the back wall 3. A base 8 is provided below the chairs 6 and below the air conditioning unit 7. Furthermore, a deflection plate 4 is provided above the back wall 3. The deflection plate 4, air conditioning unit 7, and base 8 form an air-conditioned space (hereinafter referred to as the "air-conditioned space") in the space in front of the back wall 3. Here, the air conditioning includes at least one of cooling and heating.

[0013] (2) Cooling operation by the air conditioning space generation system 1 Figure 2 is a perspective view showing a cross-section of the air conditioning space generation system 1, and is the A-A' section of Figure 1. Figure 3 is a perspective view showing a cross-section of the air conditioning space generation system 1, and is the B-B' section of Figure 1. Figure 4 is a perspective view showing a cross-section of the air conditioning space generation system 1, and is the C-C' section of Figure 1.

[0014] In the air-conditioned space generation system 1, the second housing 46, the first housing 40, and the third housing 48 are arranged in order from top to bottom. The first housing 40 has a central housing 42 in the center, a first lateral housing 44a to the left of the central housing 42, and a second lateral housing 44b to the right of the central housing 42. The first lateral housing 44a and the second lateral housing 44b are collectively referred to as the lateral housing 44. Both the central housing 42 and the lateral housing 44 have a hollow box shape. The lower part of the third housing 48 is the base 8 mentioned above, which protrudes to the front. The third housing 48 is also hollow.

[0015] An air conditioner 200 is housed inside the central enclosure 42. The air conditioner 200 has a box-shaped main body 200a and is capable of both cooling and heating operations. An air conditioner outlet 200b for blowing out conditioned air from the air conditioner 200 is located on the upper front of the main body 200a, and air conditioner intake ports 200c for drawing in air to be conditioned by the air conditioner 200 are located on both sides of the main body 200a.

[0016] A left partition 23a is sandwiched between the left side surface of the central housing 42 and the left side surface of the air conditioner 200, and a right partition 23b is sandwiched between the right side surface of the central housing 42 and the right side surface of the air conditioner 200. Further, through holes penetrating in the left-right direction are provided in a part of each of the left partition 23a and the right partition 23b, and the air conditioner suction port 200c is exposed in the through holes of each of the left partition 23a and the right partition 23b. With such a configuration, in the internal space of the central housing 42, a space communicating with the air conditioner blowout port 200b (hereinafter referred to as "blowout space 52") and two spaces communicating with the air conditioner suction port 200c (hereinafter referred to as "suction spaces 54") are isolated from each other. That is, the internal space of the central housing 42 is divided into the blowout space 52 and the two suction spaces 54.

[0017] The central housing 42 is connected to the second housing 46, and the blowout space 52 of the central housing 42 communicates with the internal space 60 of the second housing 46 of the second housing 46 via the upper opening 31. Further, the central housing 42 is connected to the third housing 48, and the blowout space 52 of the central housing 42 communicates with the internal space 62 of the third housing 48 of the third housing 48 via the lower opening 32. The upper opening 31 is an opening provided between the blowout space 52 and the internal space 60 of the second housing, and the lower opening 32 is an opening provided between the blowout space 52 and the internal space 62 of the third housing. When the air conditioner 200 performs a cooling operation, the lower opening 32 is closed by the lower plate 22. The attachment and detachment of the lower plate 22 may be manually performed by the user or may be automatically performed.

[0018] On the front side of the second housing 46, a cooling blowout port 12 for blowing out the air blown out from the air conditioner 200 toward the front side is provided. The cooling blowout port 12 includes, for example, a central cooling blowout port 12a, a left cooling blowout port 12b, and a right cooling blowout port 12c. The central cooling blowout port 12a is disposed above the central housing 42, the left cooling blowout port 12b is disposed above the first lateral housing 44a, and the right cooling blowout port 12c is disposed above the second lateral housing 44b. The left cooling blowout port 12b and the right cooling blowout port 12c may be disposed and the central cooling blowout port 12a may be omitted.

[0019] The deflection plate 4 includes a protruding plate 4a and an extension plate 4b. The protruding plate 4a is positioned on the upper side of the second housing 46 and protrudes toward the front. The extension plate 4b extends downward in a curved manner from the front end of the protruding plate 4a.

[0020] The side enclosure 44 is not connected to the second enclosure 46 and is located to the side of the central enclosure 42. The internal space 56a of the first side enclosure 44a communicates with the left intake space 54 (not shown) which is connected to the left air conditioning intake port 200c. The left intake space 54 (not shown) is an intake space 54 formed by the left partition 23a. The internal space 56b of the second side enclosure 44b communicates with the right intake space 54 which is connected to the right air conditioning intake port 200c. The right intake space 54 is an intake space 54 formed by the right partition 23b.

[0021] The front surface of the first side enclosure 44a is provided with a left-side intake port 13a for drawing in outside air. The front surface of the second side enclosure 44b is provided with a right-side intake port 13b for drawing in outside air. On the other hand, the central enclosure 42 is not provided with any intake ports.

[0022] The following describes the airflow in the air conditioning space generation system 1 with this configuration. When the air conditioner 200 is in cooling operation, it blows cooled air from the air conditioning outlet 200b into the discharge space 52. Since the lower opening 32 between the discharge space 52 and the internal space 62 of the third housing is closed by the lower plate 22, the air blown out from the air conditioning outlet 200b proceeds as a cooled airflow 303a from the discharge space 52, through the upper opening 31, and into the second housing 46. The cooled airflow 303a is blown out from the cooling outlet 12 as a cooled airflow 301. The cooled airflow 301 moves forward along the protruding plate 4a and then downward along the extension plate 4b.

[0023] The cooling airflow 301 moves downwards, and a portion of it heads towards the intake port 13. A portion of the cooling airflow 301 is drawn from the intake port 13 into the internal space 56 of the side enclosure, and from the internal space 56 of the side enclosure, it passes through the intake space 54 and is drawn into the air conditioning intake port 200c. The air conditioner 200 performs cooling on the air drawn in from the air conditioning intake port 200c. Meanwhile, the remaining cooling airflow 301 that is not drawn into the intake port 13 continues downwards because its temperature is lower than the ambient outside temperature. As a result, an air-conditioned space is formed around the chair 6.

[0024] (3) Heating operation by the air conditioning space generation system 1 Figure 5 is a perspective view showing a cross-section of the air conditioning space generation system 1, and is a cross-sectional view taken along line A-A' in Figure 1. Figure 6 is a perspective view showing a cross-section of the air conditioning space generation system 1, and is a cross-sectional view taken along line C-C' in Figure 1. Figure 5 is shown in the same manner as Figure 2, and Figure 6 is shown in the same manner as Figure 4.

[0025] When the air conditioner 200 is operating in heating mode, the upper opening 31 is closed by the upper plate 21. The upper plate 21 may be attached or detached manually by the user or automatically. On the other hand, the lower opening 32 is not fitted with a lower plate 22. The lower part of the third housing 48 protrudes forward as a base 8. A bottom surface 14 is positioned at the bottom of the third housing 48. A heating outlet 11 is provided on the front side of the base 8, which blows air from the air conditioner 200 forward. The aforementioned chair 6 is positioned between the intake port 13 and the heating outlet 11, and on the front side of the first housing 40.

[0026] The following describes the airflow in the air conditioning space generation system 1 with this configuration. When the air conditioner 200 is in heating operation, it blows heated air from the air conditioning outlet 200b into the discharge space 52. Since the upper opening 31 between the discharge space 52 and the second housing internal space 60 is closed by the upper plate 21, the air blown out from the air conditioning outlet 200b proceeds as a heated discharge airflow 303b from the discharge space 52, through the lower opening 32, and into the third housing 48. The heated discharge airflow 303b is blown out from the heating outlet 11 as a heated airflow 302. The heated airflow 302 moves forward and, because its temperature is higher than the ambient outside temperature, moves upward.

[0027] A portion of the heating airflow 302 is directed towards the intake port 13. Another portion of the heating airflow 302 is drawn from the intake port 13 into the internal space 56 of the side enclosure, and from the internal space 56 of the side enclosure, it passes through the intake space 54 and is drawn into the air conditioning intake port 200c. The air conditioner 200 performs heating on the air drawn in from the air conditioning intake port 200c. Meanwhile, the remaining portion of the heating airflow 302 that is not drawn into the intake port 13 continues upward. As a result, an air-conditioned space is formed around the chair 6.

[0028] (4) Variations Next, the modified configuration will be explained, focusing on the differences from the previous configuration. Previously, air was supplied only by a blower inside the air conditioner 200. In the modified configuration, a blower is added to the previous configuration in order to increase the airflow. Figure 7 is a perspective view showing a cross-section of the air-conditioned space generation system 1 according to the modified configuration. This is shown in the same way as in Figure 4. The air-conditioned space generation system 1 includes a first blower 400a and a second blower 400b, collectively referred to as blower 400, and a first duct 410a and a second duct 410b, collectively referred to as duct 410. The first blower 400a includes a first blower intake port 402a and a first blower outlet port 404a, and the second blower 400b includes a second blower intake port 402b and a second blower outlet port 404b. The first blower intake port 402a and the second blower intake port 402b are collectively referred to as the blower intake port 402, and the first blower outlet port 404a and the second blower outlet port 404b are collectively referred to as the blower outlet port 404.

[0029] A first blower 400a is positioned inside the first side enclosure 44a. The first blower intake port 402a of the first blower 400a faces forward, facing the left intake port 13a (not shown) of the first side enclosure 44a. The first blower outlet port 404a of the first blower 400a faces to the right, facing the left partition 23a. The first blower outlet port 404a and the through-hole in the left partition 23a are connected by a tubular first duct 410a. The first blower 400a draws in an intake airflow 304 from the first blower intake port 402a and blows the intake airflow 304 out from the first blower outlet port 404a through the first duct 410a into the intake space 54 of the left partition 23a. The intake airflow 304 is drawn in from the air conditioning intake port 200c on the left partition 23a side of the air conditioner 200.

[0030] A second blower 400b is positioned inside the second side housing 44b. The second blower intake port 402b of the second blower 400b faces forward, facing the right intake port 13b (not shown) of the second side housing 44b. The second blower outlet port 404b of the second blower 400b faces left, facing the right partition 23b. The second blower outlet port 404b and the through-hole in the right partition 23b are connected by a tubular second duct 410b. The second blower 400b draws in an intake airflow 304 from the second blower intake port 402b and blows the intake airflow 304 out from the second blower outlet 404b through the second duct 410b into the intake space 54 of the right partition 23b. The intake airflow 304 is drawn in from the air conditioning intake port 200c on the right-hand partition 23b side of the air conditioner 200.

[0031] (5) Size of the air conditioning space generation system 1 Figure 8 is a perspective view showing a cross-section of the air conditioning space generation system 1. Figure 9 is a perspective view showing a cross-section of the air conditioning space generation system 1. These are enlarged partial perspective views of the vicinity of the central cooling outlet 12a (cooling outlet 12) in Figure 2.

[0032] The length from the protruding plate 4a to the upper end 500 of the cooling air outlet 12 is defined as "h1", and the length from the upper end 500 to the lower end 502 of the cooling air outlet 12 is defined as "h2". h2 can also be said to be the length in the height direction of the cooling air outlet 12. Under these definitions, in this embodiment, h1 < h2. Preferably, 2×h1 < h2. This is for guiding the cooling air flow 301 (Fig. 2) blown out from the cooling air outlet 12 along the protruding plate 4a.

[0033] h1 is 50 mm or less, and more preferably 30 mm or less. This is also for guiding the cooling air flow 301 (Fig. 2) blown out from the cooling air outlet 12 along the protruding plate 4a. Also, h2 is 20 mm to 200 mm, and more preferably 100 mm or less. This is for increasing the wind speed to make it easier for the cooling air flow 301 (Fig. 2) to follow the protruding plate 4a and to improve the sense of coolness at the position of a person's face.

[0034] The length from the upper end 510 to the lower end 512 of the extension plate 4b is defined as "h3". Under these definitions, in this embodiment, h1 + h2 < h3. Preferably, 1.5×(h1 + h2) < h3. This is for changing the cooling air flow 301 along the protruding plate 4a downward. As a result, the cooling air flow 301 is more likely to hit the position of the face of a person sitting on the chair 6. h3 is 50 mm to 500 mm, preferably 100 to 300 mm. Also, the length from the extension plate 4b to the cooling air outlet 12 is defined as "d", and d is 200 mm to 600 mm, preferably 300 to 500 mm. These also make the cooling air flow 301 more likely to hit the position of the face of a person sitting on the chair 6.

[0035] According to this embodiment, the air blown out from the cooling outlet 12 travels forward along the protruding plate 4a and then downward along the extension plate 4b, so that an air-conditioned space can be created in outdoor environments or indoor open spaces. Furthermore, because the air blown out from the cooling outlet 12 travels forward along the protruding plate 4a and then downward along the extension plate 4b, the distance between the position from which the cooled air is blown and the air-conditioned space can be shortened. In addition, because the distance between the position from which the cooled air is blown and the air-conditioned space is shortened, effective air conditioning zoning using cool air can be achieved.

[0036] Furthermore, since the internal space 50 of the first enclosure is divided into an outlet space 52 and an intake space 54, the occurrence of short circuits can be suppressed. Also, since the intake port 13 is not provided in the central enclosure 42, but is provided in the side enclosure 44, it is possible to deliver the air blown out from the cooling outlet 12 to the bottom more easily. In addition, since the heating outlet 11 is provided in the third enclosure 48, air conditioning zoning using warm air can be achieved. Furthermore, since the heating outlet 11 is provided in the third enclosure 48, the area above the heating outlet 11 can be zoned so that it is enveloped in warm air.

[0037] Furthermore, since the intake port 13 is located above the heating outlet 11, it is possible to create a zoning effect where warm air envelops people. Also, since the intake port 13 is located between the heating outlet 11 and the cooling outlet 12, the distance from the heating outlet 11 to the intake port 13 can be shortened. Furthermore, since the distance from the heating outlet 11 to the intake port 13 is shortened, efficient zoning can be implemented. Also, since the intake port 13 is located between the heating outlet 11 and the cooling outlet 12, the distance from the cooling outlet 12 to the intake port 13 can be shortened. Furthermore, since the distance from the cooling outlet 12 to the intake port 13 is shortened, efficient zoning can be implemented.

[0038] In addition, the central housing 42 is not provided with a suction port 13, and the suction port 13 is provided in the lateral housing 44, so that the passage of the air blown out from the heating air outlet 11 can be unobstructed. Further, since the opening is blocked by the lower side plate 22 or the upper side plate 21, the cooling operation and the heating operation can be surely switched. Also, since the chair 6 is disposed between the suction port 13 and the heating air outlet 11 and on the front side of the first housing 40, the surrounding of the chair 6 can be effectively air-conditioned and zoned.

[0039] Also, since h1 < h2, the cooling air flow 301 blown out from the cooling air outlet 12 can be made to follow the protruding plate 4a. Further, since the cooling air flow 301 blown out from the cooling air outlet 12 is made to follow the protruding plate 4a, an air-conditioned space can be generated in an outdoor environment or an indoor open space or the like. Also, since h1 + h2 < h3, the cooling air flow 301 along the protruding plate 4a can be turned downward.

[0040] The outline of one aspect of the present disclosure is as follows. (Item 1) An air conditioner (200) capable of performing a cooling operation, A hollow first housing (40) for housing the air conditioner (200), A hollow second housing (46) connected to the first housing (40), A protruding plate (4a) disposed above the second housing (46) and protruding forward, An extension plate (4b) extending downward from the front end of the protruding plate (4a), The internal space of the first housing (40) and the internal space of the second housing (46) communicate with each other, On the front side of the second housing (46), a cooling air outlet (l2) for blowing out the air blown out from the air conditioner (200) forward is provided, In the first housing (40), a suction port (13) for sucking in air from the outside is provided below the cooling air outlet (12), The air blown out from the cooling air outlet (12) advances forward along the protruding plate (4a) and then advances downward along the extension plate (4b), When the length from the protruding plate (4a) to the upper end (500) of the cooling air outlet (12) is h1, and the length from the upper end (500) to the lower end (502) of the cooling air outlet (12) is h2, the air-conditioning space generation system (1) in which h1 < h2.

[0041] (Item 2) When the length from the upper end (510) to the lower end (512) of the extension plate (4b) is h3, the air-conditioning space generation system (1) according to Item 1 in which h1 + h2 < h3.

[0042] As described above, the present disclosure has been described based on the embodiments. These embodiments are illustrative, and it is understood by those skilled in the art that various modifications are possible for each of these constituent elements or combinations of each processing process, and such modifications are also within the scope of the present disclosure.

[0043] In this embodiment, the air conditioner 200 of the air-conditioning space generation system 1 performs heating operation and cooling operation. However, it is not limited to this. For example, the air conditioner 200 may perform only one of the heating operation and the cooling operation. When the air conditioner 200 performs only the heating operation, the cooling air outlet 12 and the upper opening 31 may be omitted. When the air conditioner 200 performs only the cooling operation, the heating air outlet 11 and the lower opening 32 are omitted. According to this modification example, the structure of the air-conditioning space generation system 1 can be simplified.

[0044] In the air-conditioning space generation system 1 in this embodiment, a chair 6 is provided. However, it is not limited to this. For example, the chair 6 may be omitted. According to this modification example, the structure of the air-conditioning space generation system 1 can be simplified.

[0045] Also, the first housing 40 and the second housing 46 may be considered as one housing together. Furthermore, although it was stated that the central housing 42 does not have an intake port, it is still possible to realize the air conditioning space generation system 1 even if the central housing 42 is configured to have an intake port. In this case, the intake port provided in the central housing 42 will communicate with the left intake port 13a and / or the right intake port 13b. Alternatively, by providing a partition plate or the like in the discharge space 52, the intake port provided in the central housing 42 will not communicate with the discharge space 52. [Explanation of symbols]

[0046] 1 Air conditioning space generation system, 3 Back wall, 4 Deflection plate, 4a Protruding plate, 4b Extension plate, 6 Chair, 7 Air conditioning unit, 8 Base, 11 Heating outlet, 12 Cooling outlet, 12a Central cooling outlet, 12b Left cooling outlet, 12c Right cooling outlet, 13 Intake, 13a Left intake, 13b Right intake, 14 Bottom, 21 Upper plate, 22 Lower plate, 23a Left partition, 23b Right partition, 31 Upper opening, 32 Lower opening, 40 First enclosure, 42 Central enclosure, 44 Side enclosure, 46 Second enclosure, 48 Third enclosure, 50 Internal space of first enclosure, 52 Air outlet space, 54 56 Intake space, 60 Side enclosure interior space, 62 Third enclosure interior space, 200 Air conditioner, 200a Main unit, 200b Air conditioner outlet, 200c Air conditioner intake, 301 Cooling airflow, 302 Heating airflow, 303a Cooling airflow, 303b Heating airflow, 304 Intake airflow, 400 Blower, 402 Blower intake, 404 Blower outlet, 410 Duct, 500 Upper end, 502 Lower end, 510 Upper end, 512 Lower end.

Claims

1. An air conditioner capable of cooling operation, A hollow first housing for housing the aforementioned air conditioner, A second hollow housing connected to the first housing, A protruding plate positioned on the upper side of the second housing and projecting toward the front, The system includes an extension plate that extends downward from the front end of the protruding plate, The internal space of the first enclosure and the internal space of the second enclosure are in communication with each other. The front of the second housing is provided with a cooling outlet that blows air from the air conditioner forward. The first housing is provided with an intake port for drawing in outside air below the cooling outlet, The air blown out from the aforementioned air conditioner outlet travels forward along the protruding plate, and then travels downward along the extension plate. An air conditioning space generation system in which, when the length from the protruding plate to the upper end of the cooling outlet is h1, and the length from the upper end to the lower end of the cooling outlet is h2, h1 < h2.

2. The air conditioning space generation system according to claim 1, wherein when the length from the upper end to the lower end of the extension plate is h3, h1 + h2 < h3.

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