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An exhaust muffler for a screw unit

An exhaust muffler, screw-type technology, applied in the components of pumping devices for elastic fluids, machines/engines, rotary piston/oscillating piston pump components, etc., can solve the pressure loss, affect the size of the unit, The muffler has problems such as narrow muffling bandwidth, and achieves the effect of reducing local pressure loss, reducing pressure loss along the way, and small pressure loss

Active Publication Date: 2022-05-20
MCQUAY AIR CONDITIONING & REFRIGERATION WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the screw-type cold water heat pump unit whose exhaust pipe diameter exceeds Φ50mm, it is usually not possible to directly apply the pipe-expanding muffler, because this will make the muffler too bulky and affect the size and appearance of the unit. The more common method is to expand the pipe by a certain proportion. Then arrange a perforated partition in the expansion cavity. The noise reduction of this kind of muffler is closely related to the structure of the perforated partition, and it will produce a certain pressure loss, which will affect the performance of the unit. For fixed-frequency units with no change in noise frequency, it cannot be applied to variable-frequency units with random noise frequency and operating frequency changes

Method used

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  • An exhaust muffler for a screw unit
  • An exhaust muffler for a screw unit
  • An exhaust muffler for a screw unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] like Figure 1-3The exhaust muffler shown for the screw type unit is composed of an air intake pipe 1, a muffler shell 2, an air outlet pipe 3, an air intake inner tube 4, and an air intake inner tube air hole 5. The air inlet pipe 1 and the air outlet pipe 3 are opposite to each other from both ends and communicate with the two ends of the muffler housing 2 respectively. and the outlet pipe 3 are fixedly connected to the muffler housing 2 respectively, and the connection is sealed. The muffler shell 2 is composed of an expander tube 2.1, a straight tube 2.2, and a reducer tube 2.3 according to the flow direction of the refrigerant; the muffler shell 2 is arranged with an air inlet insert pipe 4, and the air inlet insert pipe 4 is fixed on the gradually On the expander 2.1, the intake inner insert 4 is inserted into the muffler cavity 2.4 from the junction with the gradual expander 2.1; the intake insert 4 is provided with an air intake inner insert pore 5 .

[0037] ...

Embodiment 2

[0050] like Figure 2-4 The exhaust muffler shown for the screw unit has the same structure as that of Embodiment 1, the difference is that an inner insert is set in the reducer 2.3 at the air outlet. After adopting the structure of this embodiment, only the Helmholtz resonant cavity structure is retained, and various partition structures are omitted to obtain the same noise reduction effect as that of Patent No. 201520276726.8. The pressure loss trend of this example is also consistent with Figure 8 And Table 1, the content corresponding to the pressure loss in the chart is: the inner diameter of the inner intubation tube is the same as the inner diameter of the outlet pipe or larger than the inner diameter of the outlet pipe.

Embodiment 3

[0052] like figure 2 , 3 The exhaust muffler used for the screw type unit shown in .5, on the basis of embodiment 1, an air outlet inner tube 14 is added, and a hole is correspondingly added between the air inlet inner tube 4 and the air outlet inner tube 14 Plate 11. All the other are the same with embodiment 1.

[0053] In detail, such as figure 2 , 3 , 5. The exhaust muffler for the screw unit is composed of an air inlet pipe 1, a muffler shell 2, an air outlet pipe 3, an air inlet inner pipe 4, an orifice plate 11, and an air outlet inner pipe 14. The air inlet pipe 1 and the air outlet pipe 3 are opposite to each other from both ends and communicate with the two ends of the muffler housing 2 respectively. and the outlet pipe 3 are fixedly connected to the muffler housing 2 respectively, and the connection is sealed. The muffler shell 2 is composed of an expander tube 2.1, a straight tube 2.2, and a reducer tube 2.3 according to the flow direction of the refrigeran...

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Abstract

The invention relates to an exhaust muffler for a screw-type unit, which comprises an intake pipe, a muffler shell, and an air outlet pipe connected linearly in sequence; the muffler shell is composed of an expanding pipe, a straight pipe, and a tapering pipe according to the flow direction of the refrigerant , the turning space combined sequentially in the muffler shell is the muffler cavity; it is characterized in that: at least one of the expander and the reducer is fixed with an inner insert; the inner insert is formed with the expander or the The joint of the shrinking tube is inserted into the muffler cavity; the wall of the inner tube is provided with through-hole air holes; the center of rotation of the muffler shell coincides with the centers of rotation of the inlet pipe and the outlet pipe. On the premise of ensuring the noise reduction capacity, the pressure loss of the muffler is smaller and the structure is simpler, and the muffler can be applied to the frequency conversion screw type unit with a large change in noise frequency.

Description

technical field [0001] The invention relates to a screw type cold water heat pump system, in particular to an exhaust muffler for a screw type cold water heat pump unit. Background technique [0002] Exhaust pressure pulsations are common in screw chilled water heat pump units, and these exhaust pulsations become audible sound sources in the system, affecting the noise and vibration of the entire unit. The method of reducing exhaust pulsation is generally to install a muffler on the exhaust port of the compressor or the exhaust pipe. This muffler is usually a pipe-expanding resistant muffler. The principle of muffler is to use the sudden change in the inner diameter of the pipe to reflect the sound wave and interference, so as to reduce the noise propagating along the pipeline. However, this kind of muffler needs a higher expansion ratio of the inner diameter of the pipeline. In engineering, the expansion ratio is generally designed to be 3~4, so this kind of muffler is gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C29/06
CPCF04C29/061F04C29/065
Inventor 孙义祥周杰张林波
Owner MCQUAY AIR CONDITIONING & REFRIGERATION WUHAN
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