Air-cooled heat pump unit exhaust vane type silencer structure

Abstract

The utility model discloses an exhaust vane type silencer structure of an air-cooled heat pump unit, which is mounted above an exhaust fan component of the air-cooled heat pump unit and comprises an upper silencing insert, a lower plenum chamber and a flow deflector component arranged in the lower plenum chamber. The flow deflector assembly comprises flow deflectors, fixing ribs and fixing columns, the flow deflectors are at least used for adjusting flow field distribution in the silencer, and the fixing ribs are connected with the flow deflectors and the fixing columns. The flow deflector is used for adjusting the flow field of airflow entering the silencer insertion piece part, so that the flow field in the silencer is more uniform, the situation that airflow regeneration noise is increased due to the fact that the local wind speed is too high is avoided, and finally the actual noise reduction performance of the silencer is improved.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, specifically to a structure of an exhaust plate silencer for an air-cooled heat pump unit. Background Technology

[0002] The commonly used exhaust plate silencer solution for air-cooled heat pump units has the problem of insufficient utilization of the flow area, resulting in excessively high local wind speeds, which in turn leads to increased noise generated by airflow and affects the noise reduction effect of the silencer. Figure 1 This paper demonstrates a commonly used exhaust plate silencer structure for air-cooled heat pump units. This silencer structure is installed above the exhaust fan assembly 3 of the air-cooled heat pump unit and includes an upper silencer plate 1 and a lower static pressure box 2. In actual operation, there are large zero-velocity and low-velocity areas on both sides of the silencer, resulting in multiple cylindrical airflow distributions in the exhaust air. The overall flow area is underutilized. Figure 2 In this situation, a localized increase in wind speed occurs, leading to increased airflow-generated noise and affecting the noise reduction effect of the silencer. Actual measurement results of airflow-generated noise from a glass wool resistive silencer show that when the flow velocity increases from 5 m / s to 15 m / s, the 1 / 1 octave band airflow-generated noise level increases significantly in multiple frequency bands, such as from 85 dB to 91 dB in the 63 Hz band and from 75 dB to 84 dB in the 125 Hz band.

[0003] Patent specification CN111477205B discloses a plate-type silencer, comprising: a silencer plate, and a silencer housing, the silencer housing being adapted to accommodate at least two silencer plates at intervals, with an airflow channel formed between the two silencer plates; the silencer plate includes: a silencer plate housing, at least partially composed of perforated plates, and composed of at least two types of perforated plates with different perforation rates; and sound-absorbing material, the sound-absorbing material being uniformly filled inside the silencer plate housing. The plate-type silencer provided by this patent technology, with the silencer plate housing composed of at least two types of perforated plates with different perforation rates, can silence different spectral portions of the noise source by using different perforation rates, thereby achieving the optimal overall noise reduction under the same pressure loss conditions.

[0004] The aforementioned patented technology achieves noise reduction by optimizing the sound-absorbing sheet, and is not applicable to, for example... Figure 1 , Figure 2 The image shows a silencer already in service. For the exhaust fan-type silencer structure of air-cooled heat pump units already in practical use, achieving better noise reduction through simple modifications would have significant practical implications. Utility Model Content

[0005] To address the aforementioned technical problems and shortcomings in this field, this utility model provides a structure for an exhaust vane-type silencer for air-cooled heat pump units. By setting guide vanes to optimize the airflow velocity distribution within the silencer, it reduces airflow-generated noise, improves the actual noise reduction performance of the silencer, and solves the problems of insufficient utilization of the flow area, increased airflow-generated noise due to localized high wind speeds, and decreased noise reduction effect in exhaust vane-type silencers for air-cooled heat pump units.

[0006] The specific technical solution is as follows:

[0007] A type of exhaust plate silencer structure for an air-cooled heat pump unit is installed above the exhaust fan assembly of the air-cooled heat pump unit. It includes an upper silencer insert and a lower static pressure box. The air-cooled heat pump unit exhaust plate silencer structure also includes a guide vane assembly disposed in the lower static pressure box.

[0008] The guide vane assembly includes a guide vane, a fixing rib, and a fixing post. The guide vane is used to adjust the flow field distribution within the muffler, and the fixing rib connects the guide vane and the fixing post.

[0009] This invention involves installing guide vanes in the static pressure box at the front end of the exhaust vane silencer of an air-cooled heat pump unit. This controls the overall flow velocity of the silencer insert within a suitable range, reducing high-speed areas and lowering airflow-generated noise.

[0010] In this invention, the number, spacing, angle, and relative height of the guide vanes are variable. The fixing column can be vertically installed.

[0011] In some embodiments, the air-cooled heat pump unit exhaust vane silencer structure has an angle of 0° to 45° between the guide vane and the vertical direction.

[0012] In order to make the flow field inside the silencer more uniform, in some embodiments, the air-cooled heat pump unit exhaust vane type silencer structure has multiple guide vanes arranged at intervals, in the same direction and on the same plane.

[0013] In some embodiments, the exhaust vane silencer structure of the air-cooled heat pump unit has each guide vane having the same, partially the same, or completely different angles with the vertical direction.

[0014] In some embodiments, the exhaust vane silencer structure of the air-cooled heat pump unit has the same bottom spacing between any two adjacent guide vanes.

[0015] In some embodiments, the exhaust vane silencer structure of the air-cooled heat pump unit has multiple fixing columns arranged on both sides of the guide vane for easy fixing of the guide vane.

[0016] In some embodiments, the exhaust vane silencer structure of the air-cooled heat pump unit has multiple fixing ribs, each of which passes through all the guide vanes and is connected at both ends to fixing posts on both sides of the guide vanes. The guide vanes are fixed at multiple points to avoid vibration and noise under the impact of airflow.

[0017] In some embodiments, the air-cooled heat pump unit exhaust fan assembly includes multiple exhaust fans arranged laterally and longitudinally on a plane. To make the flow field inside the silencer more uniform, the guide vanes are arranged laterally or longitudinally, and the length of the guide vanes partially or completely covers all the exhaust fans in the laterally or longitudinal direction. The distance between the two outermost guide vanes partially or completely covers all the exhaust fans in the longitudinal or lateral direction. The fixed ribs are arranged longitudinally or laterally, and a row of exhaust fans along the direction of the fixed ribs constitutes a group. The area enclosed by the two outermost guide vanes and any two adjacent fixed ribs vertically corresponds one-to-one with each group of exhaust fans.

[0018] In some embodiments, the exhaust vane type silencer structure of the air-cooled heat pump unit has an adjustable vertical position for the guide vanes within the lower static pressure box. The guide vanes are fixed in a height-adjustable manner to meet installation and unit maintenance needs.

[0019] In some embodiments, the air-cooled heat pump unit exhaust vane silencer structure uses clamps to connect the fixing ribs and fixing columns, but other adjustable fixing methods can also be used. For example, the guide vanes are welded to the fixing ribs, and the fixing ribs are then fixed to the fixing columns using clamps.

[0020] In order to make the flow field inside the silencer more uniform, in some embodiments, the air-cooled heat pump unit exhaust fan silencer structure has a guide vane distance of not less than 0.5m from the air-cooled heat pump unit exhaust fan assembly, and the number of guide vanes is not less than 14.

[0021] For example, when the diameter of the exhaust fan in the exhaust fan assembly of an air-cooled heat pump unit is about 800-1000mm, and the air volume of a single exhaust fan is 18,000 m³ / h. 3 When the static pressure box height is about 1m and the distance between the guide vane and the exhaust fan assembly of the air-cooled heat pump unit is not less than 0.5m, the number of guide vanes is not less than 14, and the angle between the guide vane and the vertical direction is between 0° and 45°.

[0022] In order to make the flow field inside the silencer more uniform, in some embodiments, the air-cooled heat pump unit exhaust plate silencer structure has strip-shaped guide vanes with rounded edges.

[0023] In some embodiments, the air guide vane of the air-cooled heat pump unit exhaust vane silencer structure is made of aluminum alloy.

[0024] The key to this invention is the use of guide vanes to adjust the airflow field entering the muffler insert section, making the flow field inside the muffler more uniform, avoiding localized high wind speeds that could lead to increased noise generated by airflow, and ultimately improving the actual noise reduction performance of the muffler.

[0025] Compared with the prior art, the advantages of this utility model are as follows:

[0026] 1. Unique flow field control: It innovatively proposes to set guide vanes in the static pressure box to adjust the flow velocity distribution in the silencer. Compared with the traditional silencer structure, it effectively solves the problems of insufficient utilization of flow area and excessive local wind speed.

[0027] 2. Simple and feasible implementation method: This solution is relatively easy to implement and simple to produce. For example, the production and processing of strip guide vanes is easy and the cost is controllable. It can achieve good flow field optimization effect and has high engineering application value. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an exhaust fan silencer for an air-cooled heat pump unit in the prior art. In the figure: 1-upper silencer insert; 2-lower static pressure box; 3-exhaust fan assembly of the air-cooled heat pump unit.

[0029] Figure 2 for Figure 1 The diagram shows the internal air velocity distribution under the air outlet condition of the exhaust plate silencer structure of the air-cooled heat pump unit.

[0030] Figure 3 The diagram shows a specific embodiment of an exhaust fan silencer for an air-cooled heat pump unit. In the diagram: 1-upper silencer insert; 2-lower static pressure box; 3-air-cooled heat pump unit exhaust fan assembly; 4-guide vane; 5-fixing rib; 6-fixing column.

[0031] Figure 4 , Figure 5 This is a partial enlarged view of the structure of an exhaust vane silencer for an air-cooled heat pump unit in a specific embodiment. In the figure: 4-guide vane; 5-fixing rib; 6-fixing column; 7-clamp.

[0032] Figure 6 This is a schematic diagram of the internal air velocity distribution under the air outlet condition of an exhaust plate silencer structure for an air-cooled heat pump unit in a specific embodiment. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0034] like Figure 3As shown, a type of exhaust fan silencer structure for an air-cooled heat pump unit is installed above the exhaust fan assembly 3 of the air-cooled heat pump unit. It includes an upper silencer insert 1 and a lower static pressure box 2, as well as a guide vane assembly disposed in the lower static pressure box 2.

[0035] The exhaust fan assembly 3 of the air-cooled heat pump unit includes 14 exhaust fans arranged horizontally and vertically on a single plane. Figure 3 The diagram shows a heat pump unit with seven longitudinally arranged exhaust fans, each group consisting of two transverse exhaust fans. In this embodiment, the exhaust fan diameter is approximately 800–1000 mm, and the airflow of a single exhaust fan is 18,000 m³ / h. 3 The exhaust fan speed is approximately 1 m / h, the distance between two adjacent exhaust fan groups is 910 mm, and the height of the lower static pressure box 2 is 1 m.

[0036] The guide vane assembly includes a guide vane 4, a fixing rib 5, and a fixing post 6. The guide vane 4 is used to adjust the flow field distribution within the muffler, and the fixing rib 5 connects the guide vane 4 and the fixing post 6.

[0037] The guide vanes 4 are made of aluminum alloy, are strip-shaped with rounded edges, and consist of 16 pieces arranged at intervals, longitudinally aligned, and located on the same plane. The bottom spacing between adjacent guide vanes 4 is the same, 120mm. The 16 guide vanes 4 are divided into two symmetrical groups, left and right, with 8 guide vanes 4 in each group. Taking the right group of guide vanes 4 as an example, the installation angles from the inside out are 100°, 100°, 100°, 70°, 70°, 60°, 60°, and 60°, respectively. These installation angles are counterclockwise rotations with the horizontal to the right as the reference. Each guide vane 4 has a width of 0.1m and a thickness of 2mm. The length of the guide vane 4 is equal to the number of exhaust fan groups × the distance between exhaust fans - 40mm. In this embodiment, with 7 exhaust fan groups and a distance of 910mm, a guide vane 4 with a length of 6330mm is used.

[0038] There are 18 fixed columns 6, which are arranged at intervals on both sides of the guide vane 4.

[0039] There are 8 fixed ribs 5. Each fixed rib 5 passes through all the guide vanes 4 and its two ends are connected to the fixed posts 6 on both sides of the guide vane 4. The fixed ribs 5 are arranged horizontally. The area enclosed by the two outermost guide vanes 4 and any two adjacent fixed ribs 5 corresponds vertically to each set of exhaust fans.

[0040] See Figure 4 , Figure 5 The fixing rib 5 and the fixing column 6 are connected by clamps 7, making the vertical position of the guide vane 4 adjustable within the lower static pressure box 2. In this embodiment, the distance between the guide vane 4 and the exhaust fan assembly 3 of the air-cooled heat pump unit is 0.6m.

[0041] See Figure 6The exhaust vane silencer structure of the air-cooled heat pump unit in this embodiment can control the overall flow velocity within the silencer vanes to 7.5–9.3 m / s. A very small portion of the 10 m / s area only appears at the inlet end of the silencer vanes, and this part of the noise can also be further reduced by the silencer vanes. It can produce a reduction of about 3 dB, which is significant.

[0042] Furthermore, it should be understood that after reading the above description of this utility model, those skilled in the art can make various alterations or modifications to this utility model, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. An air-cooled heat pump unit exhaust fin-type silencer structure installed above an air-cooled heat pump unit exhaust fan assembly, comprising an upper silencer insert and a lower static pressure tank, characterized in that, The exhaust plate silencer structure of the air-cooled heat pump unit also includes a guide vane assembly installed in the lower static pressure box. The guide vane assembly includes a guide vane, a fixing rib, and a fixing post. The guide vane is used to adjust the flow field distribution within the muffler, and the fixing rib connects the guide vane and the fixing post.

2. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 1, characterized in that, The angle between the guide vane and the vertical direction is 0° to 45°.

3. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 1 or 2, characterized in that, The guide vanes are multiple pieces, arranged at intervals, in the same direction, and located on the same plane; The angles between each guide vane and the vertical direction are all the same, partially the same, or all different.

4. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 3, characterized in that, The bottom distance between any two adjacent guide vanes is the same.

5. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 3, characterized in that, There are multiple fixed columns, arranged on both sides of the guide vane; There are multiple fixing ribs, each of which passes through all the guide vanes and is connected at both ends to the fixing posts on both sides of the guide vanes.

6. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 5, characterized in that, The air-cooled heat pump unit exhaust fan assembly includes multiple exhaust fans arranged horizontally and vertically on a single plane; The guide vanes are arranged in a horizontal or vertical direction. The length of the guide vanes partially or completely covers all the exhaust fans in the horizontal or vertical direction. The distance between the two outermost guide vanes partially or completely covers all the exhaust fans in the vertical or horizontal direction. The fixed ribs are arranged in a vertical or horizontal direction. A row of exhaust fans along the direction of the fixed ribs is a group. The area enclosed by the two outermost guide vanes and any two adjacent fixed ribs corresponds vertically to each group of exhaust fans.

7. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 1, characterized in that, The vertical position of the guide vane inside the lower static pressure chamber is adjustable.

8. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 1 or 7, characterized in that, The fixing ribs and fixing columns are connected by clamps.

9. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 1, characterized in that, The distance between the air guide vanes and the exhaust fan assembly of the air-cooled heat pump unit shall not be less than 0.5m, and there shall be no fewer than 14 air guide vanes.

10. The structure of the exhaust plate silencer for an air-cooled heat pump unit according to claim 1, characterized in that, The deflector is strip-shaped with rounded edges; The guide vane is made of aluminum alloy.

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