CN103256830A - Sheet type silencer with adjustable through-flow area - Google Patents

Abstract

The invention discloses a chip muffler with adjustable flow area, which comprises several mufflers; the muffler unit includes a fixed muffler body, and the muffler unit also includes Rectangular cavity, the fixed muffler is fixed in the cavity; the back plate is provided with a number of guide shafts perpendicular to the back plate and passing through the fixed muffler; it also includes a movable muffler, and the movable muffler is arranged with The guide sleeve matched with the guide shaft, the movable muffler can slide along the guide shaft by relying on the guide sleeve; it also includes two rotating shafts, two arc-shaped fixed deflectors and two An arc-shaped movable deflector; also includes a driver that can drive the movable muffler to move along the guide shaft. The muffler with the above structure can adjust its flow area, that is, determine the thickness and spacing of the muffler according to the annual average temperature, so that the fan with appropriate power can be selected.

Description

A slice muffler with adjustable flow area

technical field

The invention relates to a ventilation muffler, in particular to an air inlet and exhaust muffler suitable for a cooling tower of a fuel-fired power plant.

Background technique

With the improvement of environmental protection requirements, in order to reduce the impact of high-noise equipment on the surrounding environment, it is generally required to arrange mufflers at the air inlet and outlet of the intake and exhaust fans to prevent noise from spilling out. The control of fan intake and exhaust noise generally uses a chip muffler, and its noise reduction (insertion loss) is generally implemented in accordance with GB12348-2008 "Environmental Noise Emission Standards at Boundary of Industrial Enterprises". According to this standard, there is generally a difference of 10 dB(A) between daytime and nighttime control standards. In the design, it is generally designed according to the night standard. There are two main indicators for the performance of the muffler: one is its insertion loss (muffling capacity), and the other is wind resistance. The overall requirement is to have a large amount of noise attenuation and a small wind resistance. But these two indicators are sometimes contradictory. If the wind resistance is required to be small, the flow area of the muffler must be large. It is also required that the chip spacing of the chip muffler be large, and the increase of the chip spacing will inevitably affect the sound attenuation.

And we know that if the noise reduction requirement is high, the sheet thickness of the sheet muffler should be increased, and the distance between the sheet mufflers should be small. A small space between the plates means that the flow section of the muffler is small, and the size of the flow section is related to the aerodynamic performance of the muffler.

The formula for calculating the wind resistance loss of the fan is as follows:

As shown in the above formula: the wind resistance of the muffler is proportional to the square of the flow velocity. If the flow cross section is small, the wind resistance of the muffler will increase and the air volume will be reduced. To ensure the same air volume, the power of the fan must be increased.

The air resistance of the muffler of the cooling tower will directly affect the outlet temperature of the cooling water. If the air resistance is large, the air intake will be small. Especially in the high temperature season in summer, sufficient air volume is required. Therefore, the general fan power must be selected according to the worse working conditions. , This will inevitably increase the power of the fan, that is, to choose a high-power fan, resulting in increased energy consumption. In fact, the high temperature season is not too long every year. After choosing a high-power fan, energy consumption will be wasted in other times of the year.

The traditional approach has the following disadvantages:

1. The cross-section of the flow is fixed, so it is difficult to adapt to the different noise limit values during the day and night, as well as the requirements of high temperature and general temperature on the fan.

2. The fixed muffler can only be equipped with a high-power fan according to the noise limit value at night and the cooling requirements of the high-temperature season. cause energy waste.

Contents of the invention

In view of the above technical problems, the present invention provides a plate muffler with adjustable flow area, which can adjust the size of its flow area.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A sheet type muffler with adjustable flow area, including several mufflers; the muffler unit includes a fixed muffler, and the fixed muffler includes a rectangular body surrounded by orifice plates, and the rectangular body is filled with There is a sound-absorbing material, and it is characterized in that: the sound-absorbing unit also includes a rectangular cavity surrounded by a back plate and an upper and lower cover plate, and the fixed sound-absorbing body is fixed in the cavity; The guide shaft that runs through the fixed muffler; also includes a movable muffler, the movable muffler includes a rectangular body surrounded by orifice plates, the rectangular body is filled with sound-absorbing materials; the movable muffler is arranged with The guide sleeve matched with the guide shaft, the movable muffler can slide along the guide shaft by relying on the guide sleeve; it also includes two rotating shafts, two arc-shaped fixed deflectors and two Arc-shaped movable deflector; both ends of the rotating shaft are respectively fixed with the upper and lower cover plates; one side of the fixed deflector is fixed on the rotating shaft, and the other side is fixed on the fixed muffler; one side of the movable deflector is set It is on the rotating shaft and can rotate around the axis of the rotating shaft, and its other side is connected with the movable muffler; it also includes a driver that can drive the movable muffler to move along the guide shaft.

As an improvement, it includes at least two sound-absorbing units installed side by side, and the two movable sound-absorbing bodies of the two sound-absorbing units are adjacent; the drive includes a power device, a drive rod, and two connecting rods; the drive rod One end is connected with the power device, and the other end is hinged with two connecting rods; the two connecting rods are respectively hinged with two movable mufflers. Two movable mufflers can be driven by one power device, which saves energy and reduces costs.

As a preferred embodiment of the above improvement, the power device is one of a hydraulic oil cylinder, a compression cylinder, and an electric motor.

As another preference, the section of the fixed deflector and the movable deflector is 1/4 oval. This shape has the least wind resistance.

As another improvement, a baffle is provided on the edge of the movable muffler, and one side of the movable baffle is in contact with the inside of the baffle; a torsion spring is set on the rotating shaft, and two torsion springs of the torsion spring The arms are respectively in contact with the fixed deflector and the movable deflector. Utilizing the tension of the torsion spring, the movable deflector is always attached to the movable muffler unit.

As another improvement, a temperature control device connected with the driver is also included. Using the temperature control system to connect the driver, the position of the movable muffler can be automatically controlled according to the temperature, thereby automatically adjusting the size of the flow area.

The benefits of the present invention are:

The muffler with the above structure can adjust its flow area, that is, determine the thickness and spacing of the muffler according to the annual average temperature, so that the fan with appropriate power can be selected. In the temperature season, when the cooling water temperature is too high, the flow section of the muffler can be changed, that is, the movable muffler can be moved inward through the remote control drive device of the control system. Increase the cross-section of the flow, reduce the wind resistance, and increase the air volume to meet the cooling requirements. If the temperature control system is adopted, the air volume and cooling water temperature can be dynamically controlled.

Compared with the fixed muffler, the outstanding advantage of the adjustable plate muffler is energy saving.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Marks in the figure: 1 cover plate, 2 fixed muffler, 3 back plate, 4 movable muffler, 5 rotating shaft, 6 fixed deflector, 7 movable deflector, 8 baffle, 9 torsion spring, 10 torsion arm , 11 guide sleeves, 12 guide shafts, 13 drive rods, 14 connecting rods, 15 power units.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in detail.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1:

Several noise reduction units of the present invention; the noise reduction unit includes a fixed noise reduction body 2, and the fixed noise reduction body 2 includes a rectangular body surrounded by orifice plates, and the rectangular body is filled with sound-absorbing materials, and is characterized in that: The noise reduction unit also includes a rectangular cavity surrounded by a back plate 3 and upper and lower cover plates 1, and the fixed noise reduction body 2 is fixed in the cavity; The guide shaft 12 of the body 2; also includes a movable muffler 4, the movable muffler 4 includes a rectangular body surrounded by orifice plates, the rectangular body is filled with sound-absorbing material; the movable muffler 4 is arranged with The guide sleeve 11 matched with the guide shaft 12, the movable muffler 4 can slide along the guide shaft 12 by relying on the guide sleeve 11; it also includes two rotating shafts 5 and two arcs which are respectively arranged at the front and rear ends of the cover plate 1 parallel to the guide shaft 11. Shaped fixed deflector 6 and two arc-shaped movable deflectors 7; the two ends of the rotating shaft 5 are respectively fixed with the upper and lower cover plates 1; one side of the fixed deflector 6 is fixed on the rotating shaft 5, and the other One side is fixed on the fixed muffler 2; one side of the movable deflector 7 is set on the rotating shaft 5 and can rotate around the axis of the rotating shaft 5, and the other side is connected with the movable muffler 4; it also includes a movable muffler that can be driven 4 Drives for movement along the guide shaft 12.

This muffler preferably comprises at least two silencing units installed side by side, and the two movable silencing bodies 4 of the two silencing units are adjacent; the driver includes a power unit 15, a drive rod 13, and two connecting rods 14; One end of the drive rod 13 is connected to the power unit 15, and the other end is hinged to two connecting rods 14; the two connecting rods 14 are hinged to the two movable mufflers 4 respectively. The power unit 15 may be one of a hydraulic oil cylinder, a compressed air cylinder, and an electric motor.

The section of the fixed deflector 6 and the movable deflector 7 is preferably 1/4 oval.

The edge of the movable muffler 4 is provided with a baffle 8, and one side of the movable deflector 7 is in contact with the inner side of the baffle 8; a torsion spring 9 is set on the rotating shaft 5, and the two torsion arms of the torsion spring 9 10 is in contact with the fixed deflector 6 and the movable deflector 7 respectively.

Also includes a temperature control device connected to the driver.

When in use, the flow area can be adjusted according to the temperature. When the flow area needs to be increased, the movable muffler 4 can be driven towards the fixed muffler 2, so that the volume of the muffler unit decreases and the flow area increases. Conversely, when the flow area needs to be reduced, the movable muffler 4 can be driven to move away from the fixed muffler 2, so that the volume of the muffler unit increases and the flow area decreases.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (6)

1. A sheet muffler with adjustable flow area, comprising several muffler units; said muffler unit comprises a fixed muffler, and said fixed muffler comprises a rectangular body surrounded by orifice plates, said rectangle The body is filled with sound-absorbing materials, and it is characterized in that: the sound-absorbing unit also includes a rectangular cavity surrounded by a back plate and upper and lower cover plates, and the fixed sound-absorbing body is fixed in the cavity; plate and runs through the guide shaft of the fixed muffler; it also includes a movable muffler, the movable muffler includes a rectangular body surrounded by orifice plates, and the rectangular body is filled with sound-absorbing materials; the movable muffler is arranged There is a guide sleeve matched with the guide shaft, and the movable muffler can slide along the guide shaft by relying on the guide sleeve; it also includes two rotating shafts, two arc-shaped fixed deflectors and Two arc-shaped movable deflectors; both ends of the rotating shaft are respectively fixed to the upper and lower cover plates; one side of the fixed deflector is fixed on the rotating shaft, and the other side is fixed on the fixed muffler; the movable deflector One side is set on the rotating shaft and can rotate around the axis of the rotating shaft, and the other side is connected with the movable muffler; it also includes a driver that can drive the movable muffler to move along the guide shaft. 2. A plate muffler with adjustable flow area according to claim 1, characterized in that: it comprises at least two mufflers installed side by side, and the two movable mufflers of the two mufflers are adjacent; The driver includes a power device, a driving rod, and two connecting rods; one end of the driving rod is connected to the power device, and the other end is hinged to two connecting rods; the two connecting rods are respectively hinged to two movable mufflers . 3. The disc muffler with adjustable flow area according to claim 2, characterized in that: said power device is one of a hydraulic oil cylinder, a compression cylinder, and an electric motor. 4. A plate type muffler with adjustable flow area according to claim 1, characterized in that: the section of the fixed deflector and the movable deflector is 1/4 oval. 5. A plate muffler with adjustable flow area according to claim 1, characterized in that: the edge of the movable muffler is provided with a baffle, and one side of the movable deflector is in contact with the inner side of the baffle. contact: a torsion spring is set on the rotating shaft, and the two torsion arms of the torsion spring are in contact with the fixed deflector and the movable deflector respectively. 6. A plate muffler with adjustable flow area according to claim 1, characterized in that it further comprises a temperature control device connected with the driver.

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