air mixer

Abstract

The application relates to an air mixer, which relates to the technical field of air mixing devices. The air mixer comprises a shell, an air inlet end, an air outlet end and an airflow mixing channel. The airflow mixing channel comprises two airflow guide surfaces and two end surfaces. The airflow guide surfaces are formed by stretching corresponding contour lines in the front-rear direction. The contour lines are constructed as follows: three circles with aligned centers and equidistant distribution are constructed in a three-dimensional space, the diameters of the two circles on the sides are equal and larger than the diameter of the middle circle; a line segment passing through the two side circles and tangent to the middle circle is constructed, an axis passing through all the circle centers is constructed, the line segment is rotated around the axis for one turn, and the intersection line of the obtained curved surface and the plane passing through the axis is taken as the contour line of the two airflow guide surfaces. The airflow mixing channel surrounded by the two airflow guide surfaces and the two end surfaces constructed in a specific manner can mix multiple airflows, and the uniformity and consistency of the mixed air are better.

Description

Technical Field

[0001] This invention relates to the field of air mixing equipment technology, and more particularly to an air mixer. Background Technology

[0002] Existing methods for mixing fluids (air, water) typically employ a three-way mixing device, where fluids from two pipes are combined into another pipe for mixing. However, this method often results in unevenly mixed fluids.

[0003] Chinese patent document CN215929771U discloses an air mixing component and an air conditioner having the air mixing component. The air mixing component includes a duct housing and a valve assembly. An air mixing chamber is formed within the duct housing. The duct housing has a first air inlet, a second air inlet, and a mixing air outlet, all of which are connected to the air mixing chamber. The valve assembly is disposed within the air mixing chamber and is used to open or close the first and second air inlets. As can be seen from the accompanying drawings of the above document, the air mixing component used is also based on a traditional three-way air mixing channel, which still suffers from uneven air mixing. Summary of the Invention

[0004] The purpose of this invention is to provide a mixer that can uniformly mix two streams of air.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a mixer, comprising a housing, an air inlet end disposed at the top of the housing, and an air outlet end disposed at the bottom of the housing, and further comprising an airflow mixing channel disposed between the air inlet end and the air outlet end, the airflow mixing channel comprising two airflow guiding surfaces disposed on the left and right sides facing each other and two end surfaces disposed on the front and rear sides facing each other, the airflow guiding surfaces being formed by stretching corresponding contour lines along the front-rear direction, the contour lines being constructed as follows:

[0006] Construct three circles in three-dimensional space with their centers aligned and equidistant from each other. Make the diameters of the circles on both sides equal and larger than the diameter of the circle in the middle. Construct line segments that pass through the two side circles and are tangent to the middle circle. Construct an axis that passes through the centers of all the circles. Rotate the previously constructed line segments around the axis for one revolution. Use the intersection of the resulting surface and the plane passing through the axis as the contour lines of the two airflow guiding surfaces.

[0007] Furthermore, the channel areas at both ends of the airflow mixing channel are equal, and the ratio of the channel area at the mixing channel to the channel area at the throat is 831:150.

[0008] Furthermore, the ratio of the distance from the end of the airflow mixing channel to the throat to the left and right width of the channel at the throat is 115:150.

[0009] Furthermore, the air inlet includes two symmetrically distributed channel openings, one on the left and one on the right, which are located above two airflow guiding surfaces respectively.

[0010] Furthermore, the projection surface of the channel opening entirely falls on the corresponding airflow guiding surface.

[0011] Furthermore, the two channels are used to input two streams of air, and the ratio of the air volume of the two streams of air is (348~351):(197~351).

[0012] Furthermore, the air outlet includes a channel outlet, the outline of which is the same as the channel outline at the lower end of the airflow mixing channel, and the channel area is also the same.

[0013] The airflow mixing channel in the mixer of the present invention changes the previous three-way structure. It is constructed in a specific way with two opposing airflow guiding surfaces. The airflow mixing channel formed by these two airflow guiding surfaces and two end faces is used to mix multiple airflows, which can make the mixed air more uniform and consistent. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the all-in-one air conditioner in the embodiment;

[0015] Figure 2 The three-dimensional shape of the mixer in the embodiment Figure 1 The anterior wall is omitted.

[0016] Figure 3 The three-dimensional shape of the mixer in the embodiment Figure 2 The anterior wall is omitted.

[0017] Figure 4 This is a cross-sectional view of the air mixer in the embodiment;

[0018] Figure 5 This is a schematic diagram of the process for constructing the surface in the embodiment. Figure 1 ;

[0019] Figure 6 This is a schematic diagram of the process for constructing the surface in the embodiment. Figure 2 ;

[0020] Figure 7 This is a schematic diagram of the process for constructing the surface in the embodiment. Figure 3 ;

[0021] Figure 8 This is a schematic diagram of the process for constructing the surface in the embodiment. Figure 4 ;

[0022] Figure 9 This is a schematic diagram of the airflow direction in the airflow mixing channel of the embodiment;

[0023] Figure 10 This is a schematic diagram of the wind speed detection results in the embodiment;

[0024] Figure 11 This is a schematic diagram of the outlet air temperature detection results in the embodiment;

[0025] Figure 12 This is a schematic diagram of the air volume and static pressure detection results in the embodiment;

[0026] Figure 13 This is a schematic diagram of the structure of the all-in-one air conditioner in the comparative example;

[0027] Figure 14 This is a cross-sectional view of the comparative intermediate air mixer.

[0028] In the picture:

[0029] 1—Shell 1a—Airflow mixing channel

[0030] 1a1—Airflow guiding surface; 1b—Air inlet end

[0031] 1b1——Channel entrance 1c——Air outlet

[0032] 2 - Fan; 3 - Fresh air flange

[0033] 4—Return air flange; 5—Heat exchanger and humidifier

[0034] 6—PTC 7—Air Supply Flange

[0035] 8 – Positive and negative double cone channels; 9 – Sampling point

[0036] 1-1——Circle 1# 1-2——Circle 2#

[0037] 1-3——Circle #3 1-4——Line segment #4 Detailed Implementation

[0038] In the description of this invention, it should be understood that the terms "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The term "a plurality of" means two or more (including two). In addition, the terms "1#" to "4#," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0039] It should be noted that the air mixer involved in this invention is applicable to various occasions where it is necessary to uniformly mix two airflows with different physical characteristics (temperature, humidity). In order to facilitate the understanding of those skilled in the art, its application in an all-in-one air conditioner will be used as an example for further explanation below. The content mentioned in the embodiments is not intended to limit the invention. Example

[0040] The fresh air system in a full-efficiency air conditioner improves indoor air quality by introducing fresh outdoor air into the room. Normally, due to the significant temperature difference between outdoor and indoor air, if outdoor air is directly introduced into the room, users will notice a significant change in the supply air temperature, resulting in poor comfort. To address this issue, before the fresh outdoor air is introduced into the room, a suitable amount of indoor air is usually mixed and its temperature adjusted through an indoor return air duct. This significantly reduces the temperature difference between the mixed fresh air and the indoor air, greatly minimizing the impact on user comfort when it is then introduced into the room. The air mixer is key to achieving this effect.

[0041] In this embodiment, the general structure of the all-in-one air conditioner is as follows: Figure 1 As shown, it mainly includes a mixer, two fans 2 (such as constant current variable frequency fans) located on the air inlet side of the mixer, a heat exchange humidifier 5 located on the air outlet side of the mixer, an isothermal dehumidification and heating device PTC 6, and an air supply flange 7. One of the fans 2 is connected to the fresh air duct through the fresh air flange 3, and the other fan 2 is connected to the return air duct through the return air flange 4. The air supply flange 7 is connected to the air outlet duct. The heat exchange humidifier 5 has a built-in ultrasonic humidification device and an external heat pump for regulating the air temperature and humidity. PTC can also be called a PTC thermistor. Ceramic PTC can be selected. PTC can be used for heating equipment that dehumidifies without cooling. The fresh air duct and return air duct connected to the above-mentioned air mixer are used to introduce outdoor air (outdoor fresh air) and indoor air (indoor return air) into the all-effect air conditioner for mixing and to regulate the temperature and humidity of the mixed air. Then, the air is delivered to the desired indoor environment through the air outlet duct. The air flow in the duct is powered by the fan 2 (such as a negative pressure fan, centrifugal fan, etc.). Driven by the fan 2, the corresponding air can flow in the fresh air duct, return air duct, and air outlet duct.

[0042] Figure 2-4The structure of the air mixer is shown, which mainly includes a housing 1, an air inlet 1b located at the top of the housing 1, and an air outlet 1c located at the bottom of the housing 1. The air mixer also includes an airflow mixing channel 1a located between the air inlet 1b and the air outlet 1c. The airflow mixing channel 1a includes two airflow guiding surfaces 1a1 arranged facing each other on the left and right, and two end faces arranged facing each other front and back. The shape of the airflow guiding surface 1a1 is key to the air mixer's ability to evenly mix fresh air with indoor return air. As can be seen from the figure, it is formed by stretching a curved contour line along the front-back direction. Specifically, this contour line is constructed in the following way (see Appendix for details). Figure 5-8 For ease of description, the appendix... Figure 5-8 The elements are numbered as follows: the two circles on both sides are numbered as circle 1#1-1 and circle 2#1-2, the middle circle is numbered as circle 3#1-3, and the line segment passing through the two circles and tangent to the middle circle is numbered as line segment 4#1-4: First, construct three circles (circle 1#1-1, circle 2#1-2, circle 3#1-3) with their centers aligned and equidistant in three-dimensional space. Make the diameters of the circles on both sides (circle 1#1-1 and circle 2#1-2) equal and larger than the diameter of the middle circle (circle 3#1-3). Then, construct a line segment (line segment 4#1-4) passing through the two circles (circle 1#1-1 and circle 2#1-2) and tangent to the middle circle (circle 3#1-3). At the same time, construct an axis passing through the center of all the circles. Finally, rotate the previously constructed line segment (line segment 4#1-4) around the axis. The intersection of the resulting surface and the plane passing through the axis is the outline of the two airflow guiding surfaces 1a1.

[0043] In this design, the channel areas at both ends of the airflow mixing channel 1a are equal, and the ratio of the channel area at the throat (the middle part of the airflow mixing channel 1a, which is also the narrowest point of the airflow mixing channel 1a) to the channel area at the throat is 831:150, which allows for more uniform mixing of the air. Furthermore, the ratio of the distance from the end of the airflow mixing channel 1a to the throat to the left-right width of the channel at the throat is 115:150, which further contributes to the uniformity of the mixed air. It should be noted that during the construction of the contour line of the airflow guiding surface 1a1, the ratio of the channel area at any end of the airflow mixing channel 1a to the channel area at the throat can be controlled by adjusting the diameter ratio of the circle on either side (circle 1-1 or circle 1-2 on either side) to the middle circle (circle 1-3 on the middle side). In other words, these two ratios are identical. Similarly, by controlling the ratio of the distance from any one side of the circle (circle 1-1 or circle 2-2) to the middle circle (circle 3-3) and the diameter of the middle circle (circle 3-3), the ratio of the distance from the end (any one end) of the airflow mixing channel 1a to the throat and the width of the channel at the throat can be controlled. That is, these two ratios are the same.

[0044] The air inlet 1b includes two symmetrically distributed channel openings 1b1, one on the left and one on the right (with the center plane between the two airflow guiding surfaces 1a1 as the center of symmetry), with the two channel openings 1b1 located above the two airflow guiding surfaces 1a1 respectively. The air outlet 1c includes a channel outlet, the outline of which is the same as the outline of the lower end of the airflow mixing channel 1a, and the channel area is also the same. A fresh air duct and a return air duct are each connected to one channel opening 1b1, and the air outlet duct is connected to the channel outlet. In this embodiment, the projection surface of the channel opening 1b1 preferably falls entirely on the corresponding airflow guiding surface 1a1. This ensures that both outdoor fresh air and indoor air are blown onto the airflow guiding surface 1a1, allowing for more thorough air mixing and a more uniform mixture. The specific technical principle is as follows: the flow direction of the fresh air entering the airflow mixing channel 1a (the left arrow in the figure represents fresh air) and the indoor return air (the right arrow in the figure represents return air) is as follows... Figure 9 As shown, under the influence of the airflow guiding surface 1a1, both the fresh air and the return air are divided into three parts. One airflow, under the Coanda effect, moves close to the airflow guiding surface 1a1 towards the channel outlet (air outlet 1c). Another airflow moves along a direction tangential to the airflow guiding surface 1a1 towards the lower region on the opposite side. A third airflow, blocked by the airflow guiding surface 1a1, turns towards the upper baffle between the two airflow guiding surfaces 1a1, and under the baffle's obstruction, turns again towards the throat. The fresh air moving close to the left airflow guiding surface 1a1 and the return air moving tangentially along the right airflow guiding surface 1a1 are located in the lower left region of the diagram. In the mixing zone, the return air moving close to the right airflow guide surface 1a1 mixes with the fresh air moving tangentially along the left airflow guide surface 1a1 in the lower right region of the diagram. The fresh air moving towards the throat mixes with the return air at the throat and above the throat. In other words, three air mixing zones are formed in the airflow mixing channel 1a of the mixer. Under the combined action of these three air mixing zones, the fresh air and indoor return air can be mixed more thoroughly, and the middle and both sides of the channel outlet can be distributed with flowing air. This makes the mixed air more dispersed and uniform, and makes the difference between the air temperature and velocity in the middle of the outlet 1c and the air temperature and velocity on both sides smaller.

[0045] In practical applications, better air mixing can be achieved by controlling the air volume relationship between the two air channels entering the mixer, making the air mixing more thorough and uniform. For example, the ratio of the air volume in the two air inlets 1b1 used for air input (i.e., the air volume in the fresh air duct and the return air duct) can be controlled at (348~351):(197~351).

[0046] The mixing effect of the air mixer was tested in an ultra-low temperature heat recovery integrated enthalpy difference laboratory. During the test, two airflows were introduced into the all-effect air conditioner (see appendix). Figure 1Nine sampling points 9 (numbered 1-9) were set at different locations at the air outlet 1c of the mixer. The wind speed and outlet air temperature at each sampling point 9 (numbered 1-9) were measured. The test results can be found in the appendix. Figure 10-12 As can be seen from the test results in the attached figure, the maximum difference in wind speed at these 9 sampling points 9 is no more than 1.6 m / s (the maximum difference is only 1.56 m / s), and the maximum difference in outlet air temperature is no more than 2.5 ℃ (the maximum difference is only 2.4 ℃). This indicates that the wind speed and outlet air temperature at different sampling points 9 are not significantly different. Moreover, the wind speed and temperature at the central sampling point 9 are also very similar to those at the sampling points on both sides. This demonstrates that the air mixed by the air mixer in this embodiment is very uniform. Comparative Example

[0047] The difference between this comparative example and the embodiment is that the mixer uses a double-cone channel 8 (see...). Figure 13 (As shown), the rest of the structure is the same as in the embodiment. Combined with... Figure 14 It can be seen that the positive and negative double conical channel 8 includes two conical channels that are symmetrically arranged vertically, and the small diameter ends of the two conical channels are connected. The test was conducted under the same experimental conditions as in the embodiment. Nine sampling points 9 (numbered 10-18) were set at different locations at the air outlet of the positive and negative double-cone channel 8. The wind speed at each sampling point 9 (numbered 10-18) was measured. In the test results, the wind speeds at the middle sampling points 9 (numbered 13-15) in the figure were 6.1 m / s, 6.5 m / s, and 6.4 m / s, respectively. The wind speeds at the sampling points 9 at the two sides in the figure (numbered 10 and 18) were 0.1 m / s and 0.15 m / s, respectively. The wind speeds at the other sampling points 9 (numbered 11-12 and 16-17) in the figure were 1.1 m / s, 3.3 m / s, 3.5 m / s, and 1.3 m / s, respectively. These data show that the air velocity after mixing is extremely uneven, with the largest difference exceeding 6 m / s. Furthermore, the wind speeds on both sides are close to 0, almost forming a static pressure zone, indicating poor air mixing uniformity.

[0048] In the above embodiment, the airflow mixing channel 1a of the mixer differs from the conventional three-way structure. Instead, it is constructed with two opposing airflow guiding surfaces 1a1. Multiple airflows are mixed through the airflow mixing channel 1a formed by these two airflow guiding surfaces 1a1 and the two end faces, resulting in better uniformity and consistency of the mixed air. Tests have shown that the mixer can uniformly mix the introduced air.

[0049] The above description is merely a preferred embodiment of the present invention. Any content that does not depart from the technical solution of the present invention shall still fall within the patent scope of the technical solution of the present invention.

Claims

1. A mixer, comprising a housing (1), an air inlet (1b) disposed at the top of the housing (1), and an air outlet (1c) disposed at the bottom of the housing (1), characterized in that: It also includes an airflow mixing channel (1a) disposed between the air inlet (1b) and the air outlet (1c). The airflow mixing channel (1a) includes two airflow guiding surfaces (1a1) arranged facing each other on the left and right, and two end faces arranged facing each other in front and behind. The airflow guiding surfaces (1a1) are formed by stretching corresponding contour lines along the front-back direction. The contour lines are constructed as follows: Construct three circles with their centers aligned and equidistant in three-dimensional space. Make the diameters of the circles on both sides equal and larger than the diameter of the circle in the middle. Construct line segments that pass through the two circles and are tangent to the middle circle. Construct an axis that passes through the centers of all the circles. Rotate the line segments constructed above around the axis for one revolution. Use the intersection of the resulting surface and the plane passing through the axis as the outline of the two airflow guiding surfaces (1a1). The air inlet (1b) includes two symmetrically distributed channel openings (1b1) on the left and right sides, and the two channel openings (1b1) are respectively located above two airflow guiding surfaces (1a1).

2. The air mixer as described in claim 1, characterized in that, The airflow mixing channel (1a) has equal channel areas at both ends, and the ratio of its area to the channel area at the throat is 831:

150.

3. The air mixer as described in claim 1, characterized in that, The ratio of the distance from the end of the airflow mixing channel (1a) to the throat to the width of the channel at the throat is 115:

150.

4. The air mixer as described in claim 1, characterized in that, The projection surface of the channel opening (1b1) all falls on the corresponding airflow guiding surface (1a1).

5. The air mixer as described in claim 1 or 4, characterized in that, The two channels (1b1) are used to input two streams of air, and the ratio of the air volume of the two streams of air is (348~351):(197~351).

6. The air mixer as described in claim 1 or 4, characterized in that, The air outlet (1c) includes a channel outlet, the outline of which is the same as the channel outline at the lower end of the airflow mixing channel (1a) and the channel area is the same.

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