An air conditioner and an air conditioner control method

Abstract

The application provides an air conditioner, which has an air outlet and a guide air component arranged at the air outlet, the guide air component comprising: a plurality of air sweeping blades arranged along the length direction of the air outlet; each air sweeping blade has a first rotation axis and a second rotation axis arranged perpendicularly to each other, the first rotation axes of any two air sweeping blades are parallel and not collinear, the second rotation axes of adjacent air sweeping blades are collinear, and the second rotation axes are parallel to the length direction of the air outlet; the air sweeping blades have an air sweeping mode and a guide air mode, in the air sweeping mode, all the air sweeping blades synchronously reciprocate around the first rotation axes thereof to adjust the air direction in the length direction of the air outlet, and in the guide air mode, all the air sweeping blades synchronously reciprocate around the second rotation axes in a limit state to adjust the air direction in the width direction of the air outlet. The application solves the problems of space occupation and complex structure when the small guide air plate and the left-right air sweeping structure exist simultaneously.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioner and an air conditioner control method. Background Technology

[0002] With the development of air conditioning, modern air conditioners often use small air guide vanes to compress air in order to achieve better heating and air compression effects. To achieve a wider range of air delivery to the left and right, a left and right sweeping structure is usually used at the air outlet of the air conditioner. The small air guide vanes and the left and right sweeping structure are in a separate state and are controlled by independent motors.

[0003] It is evident that the existing small air guide plate and left and right sweeping structures occupy space and have a complex structure when they coexist. Summary of the Invention

[0004] The problem solved by this invention is that existing small air guide plates and left and right sweeping structures occupy space and have complex structures.

[0005] To address the aforementioned problems, the present invention provides an air conditioner having an air outlet and an air guide assembly disposed at the air outlet. The air guide assembly includes: a plurality of sweeping blades arranged along the length direction of the air outlet; each sweeping blade has a first rotation axis and a second rotation axis arranged perpendicularly to each other, the first rotation axes of any two sweeping blades being parallel and not collinear, the second rotation axes of adjacent sweeping blades being collinear, and the second rotation axes being parallel to the length direction of the air outlet; the sweeping blades have a sweeping mode and an air guide mode. In the sweeping mode, all sweeping blades synchronously reciprocate around their respective first rotation axes to adjust the airflow direction along the length direction of the air outlet; in the air guide mode, all sweeping blades synchronously reciprocate around the second rotation axis in a limit state to adjust the airflow direction along the width direction of the air outlet; wherein, the limit state refers to any sweeping blade rotating around the first rotation axis until it overlaps or is coplanar with an adjacent sweeping blade.

[0006] The technical effects achieved by adopting this solution are as follows: This air guide assembly achieves both sweeping and guiding functions through different movement states of the sweeping blades, thereby saving space and simplifying the structure. Specifically, after adjacent sweeping blades overlap or are coplanar, the sweeping blades arranged along the length of the air outlet can form a complete or stepped sweeping surface. The entire sweeping surface can be rotated in the width direction of the air outlet to achieve the guiding action; the sweeping blades can be rotated left and right to achieve left and right sweeping; the sweeping angle can be adjusted by rotating the sweeping blades around the first rotation axis.

[0007] Furthermore, the sweeping blade includes a leading edge and a trailing edge; in the air guiding mode, the leading edge of the sweeping blade and the trailing edge of the adjacent sweeping blade cooperate.

[0008] The technical effects achieved by adopting this technical solution are as follows: the leading edge and trailing edge of the blades cooperate, and adjacent swept blades can be spliced ​​by rotation, which improves the efficiency of switching between swept and guided modes; and eliminates the gap between the leading edge and trailing edge of adjacent swept blades to form a complete guided plane, which can avoid air leakage during the guided process and improve the guided effect.

[0009] Furthermore, the leading edge of the blade has a raised structure; in the sweep mode, the leading edge of the blade faces outward from the air outlet; and / or, the trailing edge of the blade has a recessed structure; in the sweep mode, the trailing edge of the blade faces inward from the air outlet.

[0010] The technical effects achieved by adopting this technical solution are as follows: In the sweep mode, the raised structure at the leading edge of the blade can increase the sweep area, thereby achieving a better sweep effect; the recessed structure at the trailing edge of the blade is used to avoid the horizontal connecting rod that drives the sweep blade, making the air guide assembly structure more compact; the raised structure at the leading edge of the blade and the recessed structure at the trailing edge of the blade can work together to form a complete air guide plane.

[0011] Furthermore, the air conditioner includes an upper diffuser section disposed above the air outlet, the upper diffuser section including a rotation guide portion; the air guide assembly includes a second connecting rod, the first end of the second connecting rod being connected to at least one of the sweeping blades, the second end of the second connecting rod being slidably connected to the rotation guide portion, in the air guide mode, the first end of the second connecting rod rotating around the second rotation axis, and the second end of the second connecting rod sliding within the rotation guide portion.

[0012] The technical effects achieved by adopting this technical solution are as follows: the rotating guide part supports the second connecting rod and the sweeping blades, and at the same time, it limits the rotation mode of the sweeping blades, so that the sweeping blades can rotate stably around the first connecting rod and adjust the sweeping angle.

[0013] Furthermore, at least one second connecting rod is provided at the first rotation axis.

[0014] The technical effect achieved by adopting this technical solution is that the sweeping blades reciprocate around their respective second connecting rods to adjust the air direction along the length of the air outlet.

[0015] Furthermore, the second connecting rod is arranged parallel to the first rotation axis, but not collinear.

[0016] The technical effect achieved by adopting this technical solution is that the sweeping blades and the second connecting rod reciprocate around their respective first rotation axes to adjust the air direction along the length of the air outlet.

[0017] Furthermore, the air guide assembly also includes a first connecting rod, which is located on the second rotation axis and connected to the adjacent sweeping blades.

[0018] The technical effects achieved by adopting this technical solution are: adjacent sweeping blades rotate synchronously back and forth along the first connecting rod under extreme conditions; all sweeping blades can be synchronously swept through the first connecting rod.

[0019] Furthermore, the first connecting rod is disposed through the sweeping blade.

[0020] The technical effect achieved by adopting this technical solution is that the rotation center of the sweeping blades is located inside them.

[0021] Furthermore, the first rotation axis intersects the second rotation axis, or the extension line of the second connecting rod intersects the first connecting rod.

[0022] The technical effect achieved by adopting this technical solution is that the second connecting rod and the sweeping blades can reciprocate around the second rotation axis together, adjusting the air direction in the width direction of the air outlet.

[0023] The present invention also provides an air conditioner control method, implemented by an air conditioner as provided in any of the above embodiments; the air conditioner control method includes: when the cooling mode and the swing mode are simultaneously activated, as the air volume of the air conditioner decreases, the angle between the second link and the horizontal plane increases; and / or, when the heating mode and the swing mode are simultaneously activated, as the air volume of the air conditioner decreases, the angle between the second link and the horizontal plane decreases.

[0024] The technical effects achieved by adopting this solution are as follows: In cooling mode, the airflow is biased towards the upward diffuser section. Rotating the end of the second link connected to the rotating guide closer to the air outlet allows the airflow to flow upward along the trailing edge of the blades without obstruction, thus conforming to the airflow direction. Simultaneously, the upward guidance of the air guide blades prevents cold air from blowing in, improving comfort. As the airflow decreases, the airflow loss during left and right sweeping of the air sweeping blades needs to be reduced. When the end of the second link connected to the rotating guide is closer to the air outlet, increasing the angle between the second link and the horizontal plane reduces the angle between the fan blades and the airflow, thereby reducing airflow loss. In heating mode, the airflow is biased away from the upward diffuser section. Rotating the end of the second link connected to the rotating guide further away from the air outlet allows the airflow to flow downward along the trailing edge of the blades without obstruction, thus conforming to the airflow direction. As the air volume decreases, the air volume loss of the sweeping blades during left and right sweeping is required to be reduced. When one end of the second link connected to the rotating guide is far away from the air outlet, reducing the angle between the second link and the horizontal plane can reduce the angle between the fan blades and the airflow, thereby reducing the air volume loss.

[0025] In summary, the above-mentioned technical solutions of this application can have one or more of the following advantages or beneficial effects: i) The air guide assembly realizes both air sweeping and air guiding functions through different movement states of the air sweeping blades, thereby saving space and simplifying the structure; ii) After adjacent air sweeping blades overlap or are coplanar, the air sweeping blades arranged along the length direction of the air outlet can form a complete or stepped air sweeping surface, and the air guiding action can be realized by flipping the entire air sweeping surface in the width direction of the air outlet; iii) The air sweeping blades can rotate left and right to realize left and right air sweeping and adjust the airflow direction in the length direction of the air outlet; iv) The air sweeping blades can adjust the air sweeping angle by rotating around the first connecting rod, thereby conforming to the airflow direction and reducing wind resistance in cooling or heating modes. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an air guide assembly provided in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the mid-sweep air blades in the air guiding mode;

[0028] Figure 3 for Figure 2 Another structural diagram of the mid-sweep blades in the air guiding mode;

[0029] Figure 4 for Figure 2 A schematic diagram of the interaction between adjacent swept blades;

[0030] Figure 5 for Figure 1A schematic diagram of the movement of the mid-sweep air blades;

[0031] Figure 6 for Figure 1 A schematic diagram of the structure of the center-swept air assembly in cooling mode;

[0032] Figure 7 for Figure 1 A schematic diagram of the structure of the central air sweeping component in heating mode.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100-Air guide assembly; 101-Air outlet; 110-Sweeping blade; 111-Leading edge of blade; 112-Leading edge of blade; 120-First connecting rod; 130-Second connecting rod; 140-Upper diffuser section; 141-Rotation guide. Detailed Implementation

[0035] The purpose of this invention is to provide an air conditioner that integrates a small air guide plate and a left and right air sweeping structure.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] See Figures 1-7 This invention provides an air conditioner having an air outlet 101 and an air guide assembly 100 disposed at the air outlet 101. The air guide assembly 100 includes: a plurality of sweeping blades 110 arranged along the length direction of the air outlet 101; each sweeping blade 110 has a first rotation axis and a second rotation axis arranged perpendicularly to each other, the first rotation axes of any two sweeping blades 110 are parallel and not collinear, the second rotation axes of adjacent sweeping blades 110 are collinear, and the second rotation axes are parallel to the length direction of the air outlet 101; the sweeping blades 110 have a sweeping mode and an air guide mode. In the sweeping mode, all sweeping blades 110 synchronously reciprocate around their respective first rotation axes to adjust the airflow direction along the length direction of the air outlet 101; in the air guide mode, all sweeping blades 110 synchronously reciprocate around the second rotation axis in a limit state to adjust the airflow direction along the width direction of the air outlet 101; wherein, the limit state refers to any sweeping blade 110 rotating around the first rotation axis until it overlaps or is coplanar with an adjacent sweeping blade 110.

[0038] In this embodiment, the air guide assembly 100 achieves both air sweeping and air guiding functions through different movement states of the sweeping blades 110, thereby saving space and simplifying the structure. Specifically, after adjacent sweeping blades 110 overlap or are coplanar, the sweeping blades 110 arranged along the length direction of the air outlet 101 can form a complete or stepped sweeping surface. The entire sweeping surface can be rotated in the width direction of the air outlet 101 to achieve air guiding. The sweeping blades 110 can be rotated left and right to achieve left and right sweeping. The sweeping angle can be adjusted by rotating the sweeping blades 110 around the first rotation axis.

[0039] In one specific embodiment, the swept blade 110 includes a leading edge 111 and a trailing edge 112. In the air guiding mode, the leading edge 111 of the swept blade 110 and the trailing edge 112 of the adjacent swept blade 110 engage. It should be noted that the engagement of the leading edge 111 and the trailing edge 112 allows adjacent swept blades 110 to be joined by rotation, improving the efficiency of switching between the swept and air guiding modes. Furthermore, eliminating the gap between the leading edge 111 and the trailing edge 112 of adjacent swept blades 110 forms a complete air guiding plane, preventing air leakage during air guiding and improving the air guiding effect.

[0040] Preferably, the leading edge 111 and the trailing edge 112 of the blade can be mated by side contact, or they can be mated by overlapping each other with inclined or stepped surfaces to achieve coplanarity, which is not limited here.

[0041] In one specific embodiment, the leading edge 111 of the blade is a raised structure; in the swept mode, the leading edge 111 faces outward from the air outlet 101; and / or, the trailing edge 112 of the blade is a recessed structure; in the swept mode, the trailing edge 112 faces inward from the air outlet 101. It should be noted that in the swept mode, the raised structure of the leading edge 111 can increase the swept area, thereby achieving a better swept effect; the recessed structure of the trailing edge 112 is used to avoid the horizontal connecting rod driving the swept blade 110, making the air guide assembly 100 structure more compact; the raised structure of the leading edge 111 and the recessed structure of the trailing edge 112 can cooperate to form a complete air guide plane.

[0042] In one specific embodiment, the air conditioner includes an upper diffuser section 140 disposed above the air outlet 101, the upper diffuser section 140 including a rotation guide portion 141; the air guide assembly 100 includes a second connecting rod 130, the first end of the second connecting rod 130 being connected to at least one sweeping blade 110, and the second end of the second connecting rod 130 being slidably connected to the rotation guide portion 141. In the air guide mode, the first end of the second connecting rod 130 rotates around a second rotation axis, and the second end of the second connecting rod 130 slides within the rotation guide portion 141. It should be noted that the rotation guide portion 141 serves to support the second connecting rod 130 and the sweeping blade 110, and at the same time, it limits the rotation mode of the sweeping blade 110, allowing the sweeping blade 110 to rotate stably around the first connecting rod 120, adjusting the sweeping angle.

[0043] In one specific embodiment, a second link 130 is provided at least one first axis of rotation. The sweeping blades 110 reciprocate around their respective second links 130 to adjust the airflow direction along the length of the air outlet 101.

[0044] In another specific embodiment, the second link 130 is arranged parallel to the first rotation axis, but not collinear. The sweeping blade 110 and the second link 130 reciprocate around their respective first rotation axes to adjust the airflow direction along the length of the air outlet 101.

[0045] It should be noted that the second connecting rod 130 has a first station and a second station within the rotation guide 141; in the first station, as... Figure 7 As shown, the first end of the second connecting rod 130 is closer to the outer side of the air outlet 101 than the second end, which allows the sweeping blades 110 to guide the airflow in a direction away from the upper diffuser section 140; in the second position, as Figure 6 As shown, the second end of the second link 130 is closer to the outer side of the air outlet 101 than the first end, which allows the sweeping blades 110 to guide the airflow toward the direction of the upper diffuser section 140.

[0046] In one specific embodiment, the air guide assembly 100 further includes a first connecting rod 120, which is located on a second rotation axis and connects adjacent sweeping blades 110. Adjacent sweeping blades 110 reciprocate synchronously along the first connecting rod 120 under extreme conditions; all sweeping blades 110 can be synchronously swept via the first connecting rod 120.

[0047] In one specific embodiment, the first connecting rod 120 is disposed through the sweeping blade 110, such that the rotation center of the sweeping blade 110 is located inside it.

[0048] In one specific embodiment, the first rotation axis intersects the second rotation axis, or the extension line of the second connecting rod 130 intersects the first connecting rod 120. The second connecting rod 130 and the sweeping blade 110 can reciprocate together around the second rotation axis to adjust the airflow direction in the width direction of the air outlet 101.

[0049] Preferably, the second link 130 is connected to the top of the sweeping blade 110 to facilitate control of the direction of the sweeping blade 110. For example, the first end of the second link 130 is connected between the leading edge 111 and the trailing edge 112 of the blade to facilitate control of the orientation of the leading edge 111 and the trailing edge 112 of the blade.

[0050] Preferably, the rotation guide 141 is, for example, a guide groove, and a sliding block is provided at the second end of the second connecting rod 130. The sliding block slides within the guide groove to achieve better guiding and supporting effects. For example, the rotation guide 141 is, for example, an arc-shaped guide groove, the center of which coincides with the center of the first connecting rod 120, and the extension line of the second connecting rod 130 extending towards the sweeping blade 110 passes through the center of the first connecting rod 120, so that the sweeping blade 110 can always obtain effective support during its rotation around the first connecting rod 120.

[0051] Preferably, the sliding block is, for example, a spherical structure, which reduces the friction at the second end of the second link 130 within the rotation guide 141, resulting in smoother sliding.

[0052] Preferably, the upper diffuser section 140 is inclined relative to the horizontal direction, and the angle between the upper diffuser section 140 and the horizontal direction is θ. When the second end of the second link 130 slides in the slide groove, the sliding angle is β, and the angle between the current position of the second link 130 and the position of the second link 130 at the end of the slide groove near the air outlet 101 is β0. As the second link 130 rotates outward, the value of β0 continuously increases. In order to have better air delivery effect of the sweeping blade 110 in cooling mode and heating mode, the range of β0 is: [0, n], n∈[90°, 160°].

[0053] Preferably, in the air guiding mode, the second end of the second link 130 is located at either end of the slide groove. For example, the second end of the second link 130 is located at the end of the slide groove near the inner side of the air outlet 101, thereby achieving positioning, so that the adjacent air guide plate is at an accurate angle that allows the leading edge 111 and the trailing edge 112 of the blade to cooperate.

[0054] The present invention also provides an air conditioner control method, implemented by an air conditioner as provided in any of the above embodiments; the air conditioner control method includes: when the cooling mode and the swing mode are turned on simultaneously, as the air volume of the air conditioner decreases, the angle between the second link 130 and the horizontal plane increases; and / or, when the heating mode and the swing mode are turned on simultaneously, as the air volume of the air conditioner decreases, the angle between the second link 130 and the horizontal plane decreases.

[0055] In one specific embodiment, when both the cooling mode and the sweeping mode are activated simultaneously, the second end of the second connecting rod 130 is located at the end of the rotation guide 141 near the outer side of the air outlet 101, with the trailing edge 112 of the blades facing the upward diffuser section 140. It should be noted that in cooling mode, the airflow is biased towards the upward diffuser section 140. At this time, rotating the end of the second connecting rod 130 connected to the rotation guide 141 to a position near the air outlet 101, with the trailing edge 112 of the blades facing upwards towards the inner side of the air outlet 101, allows the airflow to flow upwards along the trailing edge 112 of the blades without obstructing the airflow. Therefore, it can follow the airflow direction and maintain a certain effective length in the airflow direction; simultaneously, the upward-guiding blades prevent cold air from blowing in, improving comfort. As the air volume decreases, the air volume loss of the sweeping blades 110 during left and right sweeping is required to be reduced. When one end of the second link 130 connected to the rotating guide part 141 is close to the air outlet 101, the angle γ between the second link 130 and the horizontal plane is increased, which can reduce the angle between the fan blades and the airflow, thereby reducing the air volume loss.

[0056] Preferably, in cooling mode, the air conditioner has multiple air supply speeds, including at least a strong speed, a high speed, a medium speed, a low speed, and a quiet speed.

[0057] Preferably, the default air guide angle for the high-power fan cooling mode is β0 = 180 + θ - (90 - β / 2) - Δβ, where Δβ ∈ [0, 10°]. As the air volume decreases, γ = β0 + Δε i At this time, Δε i Satisfy △ε i = (i-1)*i / 2, where i is the wind speed coefficient, i=1 for strong wind speed, i=2 for high wind speed, i=3 for medium wind speed, i=4 for low wind speed, and i=5 for quiet wind speed.

[0058] In one specific embodiment, when both the heating mode and the swing mode are activated simultaneously, the second end of the second link 130 is located at the end of the rotation guide 141 near the inner side of the air outlet 101, and the trailing edge 112 of the blade is positioned away from the upper diffuser section 140. It should be noted that in the heating mode, the airflow is biased away from the upper diffuser section 140. At this time, rotating the end of the second link 130 connected to the rotation guide 141 to a position away from the air outlet 101, with the trailing edge 112 of the blade facing downwards towards the inner side of the air outlet 101, allows the airflow to flow downwards along the trailing edge 112 of the blade without obstructing the airflow, thus conforming to the airflow direction. As the airflow decreases, the airflow loss of the swing blade 110 during left and right swings needs to be reduced. When the end of the second link 130 connected to the rotation guide 141 is away from the air outlet 101, reducing the angle between the second link 130 and the horizontal plane reduces the angle between the fan blade and the airflow, thereby reducing airflow loss.

[0059] Preferably, the default air guide angle for high-power heating mode is β0 = θ + Δβ, where Δβ ∈ [25°, 90 - θ]. As the airflow decreases, α = β0 - Δε i At this time, Δε i Satisfy: △ε i = (i-1)*i / 3.

[0060] In one specific embodiment, under other operating conditions, under the action of the motor, the fan blade swings left and right around the second connecting rod 130 in the vertical plane, wherein swinging to the left is the positive direction and swinging to the right is the negative direction, and the swing angle is σ, which satisfies [-90°, +90°].

[0061] When the air conditioner is in swing mode, σ satisfies [-65°, +65°] to ensure sufficient air volume.

[0062] When the air conditioner is not in swing mode, σ = -90° or +90°, the swing blades 110 form a plane, which can be used as a small air guide plate.

[0063] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An air conditioner having an air outlet (101) and an air guide assembly (100) disposed at the air outlet (101), characterized in that, The air guide assembly (100) includes: a plurality of sweeping blades (110) arranged along the length direction of the air outlet (101); each of the sweeping blades (110) has a first rotation axis and a second rotation axis arranged perpendicularly to each other, the first rotation axes of any two sweeping blades (110) are parallel and not collinear, the second rotation axes of adjacent sweeping blades (110) are collinear, and the second rotation axis is parallel to the length direction of the air outlet (101); The sweeping blades (110) have a sweeping mode and a guiding mode. In the sweeping mode, all the sweeping blades (110) reciprocate synchronously around their respective first rotation axis to adjust the wind direction in the length direction of the air outlet (101). In the air guiding mode, all the sweeping blades (110) reciprocate synchronously around the second rotation axis in the extreme state to adjust the air direction in the width direction of the air outlet (101); wherein, the extreme state refers to any one of the sweeping blades (110) rotating around the first rotation axis until it overlaps or is coplanar with the adjacent sweeping blade (110); The air conditioner includes an upper diffuser section (140) disposed above the air outlet (101), and the upper diffuser section (140) includes a rotation guide (141). The air guiding assembly includes a second link (130), the first end of which is connected to at least one of the sweeping blades (110), and the second end of which is slidably connected to the rotation guide (141). In the air guiding mode, the first end of the second link (130) rotates around the second rotation axis, and the second end of the second link (130) slides within the rotation guide (141).

2. The air conditioner according to claim 1, characterized in that, The sweeping blade (110) includes a leading edge (111) and a trailing edge (112); in the air guiding mode, the leading edge (111) of the sweeping blade (110) and the trailing edge (112) of the adjacent sweeping blade (110) cooperate.

3. The air conditioner according to claim 2, characterized in that, The leading edge (111) of the blade has a raised structure; in the sweeping mode, the leading edge (111) of the blade faces outward from the air outlet (101); And / or, the trailing edge (112) of the blade is a recessed structure; in the sweep mode, the trailing edge (112) of the blade faces the inside of the air outlet (101).

4. The air conditioner according to claim 2, characterized in that, At least one second link (130) is provided at the first rotation axis.

5. The air conditioner according to claim 2, characterized in that, The second link (130) is set parallel to the first rotation axis, but not collinear.

6. The air conditioner according to claim 2, characterized in that, The air guide assembly (100) further includes a first connecting rod (120), which is located on the second rotation axis and connected to the adjacent sweeping blades.

7. The air conditioner according to claim 6, characterized in that, The first connecting rod (120) is disposed through the sweeping blade (110).

8. The air conditioner according to claim 6, characterized in that, The first rotation axis intersects the second rotation axis, or the extension line of the second link (130) intersects the first link (120).

9. An air conditioner control method, characterized in that, This is achieved by an air conditioner as described in any one of claims 4-8; the air conditioner control method includes: When the cooling mode and the swing mode are activated simultaneously, as the air volume of the air conditioner decreases, the angle between the second link (130) and the horizontal plane increases; and / or, when the heating mode and the swing mode are activated simultaneously, as the air volume of the air conditioner decreases, the angle between the second link (130) and the horizontal plane decreases.

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