A method for noise reduction and a vibration isolation and noise reduction device for a gas-fired heat pump unit

Abstract

A noise reduction method and vibration isolation noise reduction device for a gas-fired heat pump unit. The noise reduction method includes: (1) analyzing the noise source of the gas-fired heat pump unit, determining the noise source, testing the noise source, collecting the noise value and resonance frequency at each speed, and avoiding the corresponding speed during engine and fan operation; (2) using the unit's built-in time detection to reduce the frequency during the detected nighttime period; (3) for other time periods, determining the unit's operating speed based on the unit's inlet and outlet water temperatures, and adjusting the engine and fan speeds. In the vibration isolation noise reduction device, the engine is fixedly installed on the chassis, a compressor bracket is fixedly installed on the chassis, the compressor is fixedly installed on the compressor bracket, the engine and compressor are installed on the chassis, and an elastic damping element is fixedly installed at the bottom of the chassis. It adopts a closed soundproof enclosure design to achieve multi-level noise reduction, and adjusts the engine speed by combining time and outlet water temperature control logic to ensure that the whole unit operates actively with low noise.

Description

Technical Field

[0001] This invention discloses a noise reduction method, particularly a noise reduction method and vibration isolation and noise reduction device for a gas heat pump unit, belonging to the technical field of gas heat pump units, and especially a method and device for reducing the noise and vibration of a gas heat pump unit. Background Technology

[0002] With the continuous growth of energy demand, gas-fired heat pump units, as a highly efficient and environmentally friendly energy utilization device, have enormous application market potential in my country's heating and cooling sectors. Gas-fired heat pumps are high-efficiency heating and cooling devices that use a gas engine to drive a heat pump cycle. During operation, the engine and other components generate vibration and noise, impacting the surrounding environment, especially at night when the vibration and noise are particularly pronounced, severely affecting the sleep quality of nearby residents. Therefore, it is necessary to research a vibration isolation and noise reduction method and device for gas-fired heat pump units to reduce vibration and noise. Summary of the Invention

[0003] To address the aforementioned drawbacks of high vibration and noise in existing gas-fired heat pumps, this invention provides a noise reduction method and vibration isolation device for gas-fired heat pump units. It employs a closed soundproof enclosure design to achieve multi-level noise reduction and adjusts the engine speed by combining time and outlet water temperature control logic to ensure active low-noise operation of the entire unit.

[0004] The technical solution adopted by this invention to solve its technical problem is: a noise reduction method for a gas-fired heat pump unit, the noise reduction method comprising:

[0005] (1) Conduct noise source analysis on the gas heat pump unit, determine the noise source, test the noise source, collect the noise value and resonance frequency at each speed, and avoid the corresponding speed during engine and fan operation;

[0006] (2) The unit has a built-in time detection system, which reduces the frequency during the nighttime period detected.

[0007] (3) For other time periods, the operating level of the unit is determined based on the inlet and outlet water temperatures, and the engine and fan speeds are adjusted accordingly.

[0008] A vibration isolation and noise reduction device for a gas heat pump unit includes a chassis, an engine, and a compressor. The engine is fixedly mounted on the chassis, a compressor bracket is fixedly mounted on the chassis, and the compressor is fixedly mounted on the compressor bracket. The engine and compressor are mounted on the chassis, and an elastic damping element is fixedly mounted on the bottom of the chassis.

[0009] The technical solution adopted by the present invention to solve its technical problem further includes:

[0010] The engine has 21 speeds, with a maximum speed of 2400 r / min and a minimum speed of 800 r / min. The fan has 21 speeds, with a maximum speed of 1000 r / min and a minimum speed of 200 r / min. The speed difference between the engine and the fan is divided equally, and then gradually increased or decreased according to the speed.

[0011] When determining the unit's operating level and adjusting the engine and fan speeds based on the unit's inlet and outlet water temperatures, the specific control modes include the following:

[0012] Mode 1, Cooling Mode:

[0013] When Ts+2>Two≥Ts+1, the engine gear will shift up one gear every 60s without triggering other protective adjustments;

[0014] When Ts+1>Two≥Ts, the engine will no longer perform upshift control, but can perform downshift control according to other protective adjustments of the system;

[0015] When Ts>Two≥Ts-1, the engine gears downshift by 1 every 60s until other protective controls are triggered, limiting the speed reduction;

[0016] When Ts-1>Two≥Ts-2, the engine gears downshift by 2 every 60s until other protective controls are triggered, limiting the speed reduction;

[0017] When Two < Ts-2, the unit will shut down after 60 seconds.

[0018] Mode 2, Heating Mode:

[0019] When Ts-2 < Two ≤ Ts-1, the engine gear shifts up one gear every 60 seconds without triggering other protective adjustments;

[0020] When Ts-1 < Two ≤ Ts, the engine will no longer perform upshift control, but can perform downshift control according to other protective adjustments of the system;

[0021] When Ts < Two ≤ Ts + 1, the engine downshifts by one gear every 60 seconds until other protective controls are triggered, limiting the reduction in engine speed.

[0022] When Ts+1 < Two ≤ Ts+2, the engine downshifts by 2 gears every 60 seconds until other protective controls are triggered, limiting the reduction in engine speed.

[0023] When Two > Ts + 2, the unit will shut down after 60 seconds.

[0024] Mode 3, Silent Mode:

[0025] The unit has a built-in clock function. The silent mode can be set on the unit control panel. You can manually input the time period for which you want the unit to run in silent mode, which is divided into start time and end time. For example, if you set the start time to 22:00 and the end time to 8:00, the outdoor unit will run in silent mode during the time period from 22:00 to 8:00.

[0026] The aforementioned silent mode is as follows: after the unit enters silent mode, the highest operating gear of the engine will be reduced by 4 gears compared to the highest permissible operating gear in normal mode, and the highest operating gear of the fan will be reduced by 4 gears compared to the highest permissible operating gear in normal mode.

[0027] The maximum permissible operating gear for the engine and fan in silent mode can be manually set on the control panel. The maximum permissible operating gear for the engine in silent mode cannot be lower than gear 8 in normal mode, and the maximum permissible operating gear for the fan cannot be lower than gear 6 in normal mode.

[0028] The elastic damping element is provided in a total of four, which are divided into two groups: a first elastic damping element and a second elastic damping element. Each of the first and second elastic damping elements is provided with two elastic damping elements.

[0029] An intake pressure regulating channel is fixedly installed on the chassis, and an intake sound insulation cover is installed at the intake port of the intake pressure regulating channel. The intake pressure regulating channel is set to correspond to the engine intake port.

[0030] A muffler is installed at the location of the engine exhaust passage; sound-absorbing material is attached around the engine and compressor. The engine and compressor are collectively referred to as the unit, and sound-absorbing material is provided on the inner side of the surrounding plate of the unit.

[0031] The compressor is an open scroll compressor; the chassis is an integral chassis; the heat pump unit also includes a first fan and a second fan.

[0032] The beneficial effects of this invention are as follows: This invention uses time and outlet water temperature control logic to adjust the engine speed, ensuring the active low-noise operation of the entire unit; vibration isolation devices are designed for the main noise and vibration sources, effectively isolating the transmission of vibration to the unit mounting base; this invention uses a closed soundproof enclosure, effectively reducing the overall noise of the gas heat pump unit; sound-absorbing materials and silencers are installed inside the soundproof enclosure to achieve multi-level noise reduction; and its structure is simple, easy to install, and has good practical value.

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0034] Figure 1 This is a flowchart of the control logic of the present invention.

[0035] Figure 2 This is a schematic diagram of the vibration isolation and noise reduction device of the present invention.

[0036] Figure 3 This is a schematic diagram of the internal structure of the vibration isolation and noise reduction device of the present invention. Detailed Implementation

[0037] This embodiment is a preferred embodiment of the present invention. All other embodiments that are the same as or similar to this embodiment in principle and basic structure are within the protection scope of the present invention.

[0038] Please refer to the appendix. Figure 1 This invention primarily protects a noise reduction method for a gas-fired heat pump unit, wherein the noise reduction method mainly includes:

[0039] (1) The noise source of the gas heat pump unit is analyzed to determine the main noise source (in this embodiment, the main noise source is the engine and the fan), and the main noise source is tested to collect the noise value and resonance frequency at each speed, so as to avoid the corresponding speed during the operation of the engine and the fan.

[0040] (2) The unit has a built-in time detection system, which reduces the frequency during the nighttime period to ensure the unit's operating capacity while achieving low-noise operation;

[0041] (3) For other time periods, the operating level of the unit is determined based on the inlet and outlet water temperatures, and the engine and fan speeds are adjusted accordingly.

[0042] For ease of description, in this embodiment, Ts represents the set temperature and Two represents the outlet water temperature. In implementation, the noise levels and resonant speed data of the engine and fan are first collected, and targeted masking is performed. Then, the engine and fan speed settings after masking are plotted, as shown in Tables 1 and 2.

[0043] Table 1: Engine Gear and Speed ​​Correspondence Table

[0044]

[0045] Table 2: Fan Gear and Speed ​​Correspondence Table

[0046]

[0047] The engine is divided into 21 speed settings, with a maximum speed of 2400 r / min and a minimum speed of 800 r / min. The fan is also divided into 21 speed settings, with a maximum speed of 1000 r / min and a minimum speed of 200 r / min. The speed difference between the engine and fan is divided equally and then gradually increased according to the speed settings. The system then makes judgments based on different operating modes, built-in time detection, and the outlet water temperature detection value of the gas heat pump unit. Specific control modes include the following:

[0048] Mode 1, Cooling Mode:

[0049] When Ts+2>Two≥Ts+1, the engine gear will shift up one gear every 60s without triggering other protective adjustments;

[0050] When Ts+1>Two≥Ts, the engine will no longer perform upshift control, but can perform downshift control according to other protective adjustments of the system;

[0051] When Ts>Two≥Ts-1, the engine gears downshift by one gear every 60s until other protective controls are triggered, limiting the speed reduction.

[0052] When Ts-1 > Two ≥ Ts-2, the engine downshifts by 2 gears every 60 seconds until other protective controls are triggered, limiting the speed reduction.

[0053] When Two < Ts-2, the unit will shut down after 60 seconds.

[0054] Mode 2, Heating Mode:

[0055] When Ts-2 < Two ≤ Ts-1, the engine gear shifts up one gear every 60 seconds without triggering other protective adjustments;

[0056] When Ts-1 < Two ≤ Ts, the engine will no longer perform upshift control, but can perform downshift control according to other protective adjustments of the system;

[0057] When Ts < Two ≤ Ts + 1, the engine downshifts by one gear every 60 seconds until other protective controls are triggered, limiting the reduction in engine speed.

[0058] When Ts+1 < Two ≤ Ts+2, the engine downshifts by 2 gears every 60 seconds until other protective controls are triggered, limiting the reduction in engine speed.

[0059] When Two > Ts + 2, the unit will shut down after 60 seconds.

[0060] Mode 3, Silent Mode:

[0061] The unit has a built-in clock function. The silent mode can be set on the unit control panel. You can manually input the time period for which you want the unit to run in silent mode, which is divided into start time and end time. For example, if you set the start time to 22:00 and the end time to 8:00, the outdoor unit will run in silent mode during the time period from 22:00 to 8:00.

[0062] In this embodiment, the silent mode is described as follows: After the unit enters silent mode, the highest operating gear of the engine will be 4 gears lower than the highest permissible operating gear in normal mode, and the highest operating gear of the fan will be 4 gears lower than the highest permissible operating gear in normal mode. In order to meet the requirements of unit operating noise in different scenarios, the highest permissible operating gear of the engine and the fan in silent mode can be manually set on the control panel. To ensure the unit's capacity output, the highest permissible operating gear of the engine in silent mode cannot be lower than the 8th gear in normal mode, and the highest permissible operating gear of the fan cannot be lower than the 6th gear in normal mode.

[0063] Please refer to the appendix for details. Figure 2 and attached Figure 3 This invention also protects a vibration isolation and noise reduction device for a gas-fired heat pump unit, mainly comprising a chassis 103, an engine 107, and a compressor 202. The engine 107 is fixedly mounted on the chassis 103, and a compressor bracket 203 is fixedly mounted on the chassis 103. The compressor 202 is fixedly mounted on the compressor bracket 203. The engine 107 and compressor 202 are mounted on the chassis 103, ensuring that the engine 107, engine-related accessories, and compressor 202 are on the same rigid structure. Elastic damping elements are fixedly mounted on the bottom of the chassis 103 to achieve vibration reduction. In this embodiment, four vibration damping elements are provided, divided into two groups: a first elastic damping element 101 and a second elastic damping element 102. Each of the first elastic damping element 101 and the second elastic damping element 102 has two vibration damping elements. The first elastic damping element 101 and the second elastic damping element 102 are used to isolate the transmission of vibration of the gas-fired heat pump unit during the operation of the engine and compressor. When the engine 107 drives the compressor 202 via the belt, the generated vibration force is absorbed and canceled out by the first elastic damping element 101 and the second elastic damping element 102 (a total of four vibration damping elements), thus achieving effective isolation between the vibration source and the whole machine.

[0064] In this embodiment, an intake pressure regulating channel 106 is fixedly installed on the chassis 103, and an intake sound insulation cover 105 is installed at the intake port of the intake pressure regulating channel 106. The intake pressure regulating channel 106 is set corresponding to the intake port of the engine 107. In this embodiment, a muffler 104 is installed at the position corresponding to the exhaust channel of the engine 107. During the operation of the engine 107, the noise in the intake and exhaust channels is relatively large. The design of the muffler 104 at the end of the exhaust pipe and the setting of the pressure regulating intake channel 106 and the sound insulation cover 105 at the intake port can prevent noise from being transmitted outward. Some high-frequency noise on the exhaust side of the engine 107 passes through the expansion chamber and microporous reflector in the muffler 104. The airflow slows down in the expansion chamber, generating pressure fluctuations, which interact with the microporous reflector to attenuate the sound waves. The intake pressure regulating channel 106 and the sound insulation cover 105 are designed at the front end of the engine 107 intake system, which not only ensures the engine intake performance but also blocks the transmission of noise from the engine cylinder to the outside.

[0065] In this embodiment, sound-absorbing material is attached around the engine 107 and compressor 202. The engine 107 and compressor 202 are collectively referred to as the unit. Sound-absorbing material is provided on the inner side of the surrounding plate of the unit. Four places are marked in the figure: the first sound-absorbing material 109, the second sound-absorbing material 110, the third sound-absorbing material 111, and the fourth sound-absorbing material 112. In actual implementation, sound-absorbing material is also provided on the other two sides, which are not shown in the figure. When the engine 107 and compressor 202 are running, noise will be generated due to the mechanical movement of the internal structure. By attaching sound-absorbing material around the engine 107 and compressor 202, some of the sound energy will enter the pores of the sound-absorbing material during the sound wave transmission process and rub against the molecules in the material. In this process, the sound energy is converted into heat energy, and the noise of the engine 107 and compressor 202 is effectively reduced.

[0066] In this embodiment, the compressor 202 is an open scroll compressor.

[0067] In this embodiment, the chassis 103 adopts an integral chassis.

[0068] In this embodiment, the heat pump unit also includes a first fan 108 and a second fan 113.

[0069] This invention uses time and outlet water temperature control logic to regulate engine speed, ensuring active low-noise operation of the entire unit; vibration isolation devices are designed for the main noise and vibration sources, effectively isolating vibration from transmission to the unit mounting base; this invention uses a closed soundproof enclosure to effectively reduce the overall noise of the gas heat pump unit; sound-absorbing materials and silencers are installed inside the soundproof enclosure to achieve multi-level noise reduction; and its structure is simple, easy to install, and has good practical value.

[0070] This invention is applicable to various types of gas heat pump units and can be widely used in residential, commercial buildings, and industrial fields to provide users with a comfortable and quiet indoor environment.

Claims

1. A method for noise reduction of a gas-fired heat pump unit, characterized by: The noise reduction method includes: (1) Conduct noise source analysis on the gas heat pump unit, determine the noise source, test the noise source, collect the noise value and resonance frequency at each speed, and avoid the corresponding speed during engine and fan operation; (2) The unit has a built-in time detection system, which reduces the frequency during the nighttime period detected. (3) For other time periods, the operating level of the unit is determined based on the inlet and outlet water temperatures, and the engine and fan speeds are adjusted accordingly. When determining the unit's operating level and adjusting the engine and fan speeds based on the unit's inlet and outlet water temperatures, the specific control modes include the following: Mode 1, Cooling Mode: When Ts+2>Two≥Ts+1, the engine gear will shift up one gear every 60s without triggering other protective adjustments; When Ts+1>Two≥Ts, the engine will no longer perform upshift control, but can perform downshift control according to other protective adjustments of the system; When Ts>Two≥Ts-1, the engine gears downshift by 1 every 60s until other protective controls are triggered, limiting the reduction in engine speed; When Ts-1>Two≥Ts-2, the engine gears downshift by 2 every 60s until other protective controls are triggered, limiting the reduction in engine speed; When Two < Ts-2, the unit will shut down after 60 seconds. Mode 2, Heating Mode: When Ts-2 < Two ≤ Ts-1, the engine gear shifts up one gear every 60 seconds without triggering other protective adjustments; When Ts-1 < Two ≤ Ts, the engine will no longer perform upshift control, but can perform downshift control according to other protective adjustments of the system; When Ts < Two ≤ Ts + 1, the engine downshifts by one gear every 60 seconds until other protective controls are triggered, limiting the reduction in engine speed. When Ts+1 < Two ≤ Ts+2, the engine downshifts by 2 gears every 60 seconds until other protective controls are triggered, limiting the reduction in engine speed. When Two > Ts + 2, the unit will shut down after 60 seconds. Mode 3, Silent Mode: The unit has a built-in clock function. The unit control panel can be set to silent mode, and the desired time period for the unit to run in silent mode can be manually entered, which is divided into start time and end time. During the time period from the start time to the end time, the outdoor unit will run in silent mode.

2. The noise reduction method for a gas-fired heat pump unit according to claim 1, characterized in that: The engine has 21 speeds, with a maximum speed of 2400 r / min and a minimum speed of 800 r / min. The fan has 21 speeds, with a maximum speed of 1000 r / min and a minimum speed of 200 r / min. The speed difference between the engine and the fan is divided equally, and then gradually increased or decreased according to the speed.

3. The noise reduction method for a gas-fired heat pump unit according to claim 1, characterized in that: The aforementioned silent mode is as follows: after the unit enters silent mode, the highest operating gear of the engine will be reduced by 4 gears compared to the highest permissible operating gear in normal mode, and the highest operating gear of the fan will be reduced by 4 gears compared to the highest permissible operating gear in normal mode.

4. The noise reduction method for a gas-fired heat pump unit according to claim 1, characterized in that: The maximum permissible operating gear for the engine and fan in silent mode can be manually set on the control panel. The maximum permissible operating gear for the engine in silent mode cannot be lower than gear 8 in normal mode, and the maximum permissible operating gear for the fan cannot be lower than gear 6 in normal mode.

5. A vibration isolation and noise reduction device for implementing the vibration isolation and noise reduction method of a gas-fired heat pump unit according to any one of claims 1-4, characterized in that: The vibration isolation and noise reduction device includes a chassis (103), an engine (107) and a compressor (202). The engine (107) is fixedly mounted on the chassis (103). A compressor bracket (203) is fixedly mounted on the chassis (103). The compressor (202) is fixedly mounted on the compressor bracket (203). The engine (107) and the compressor (202) are mounted on the chassis (103). An elastic damping element is fixedly mounted on the bottom of the chassis (103).

6. The apparatus according to claim 5, characterized in that: The elastic damping element is provided in a total of four, which are divided into two groups: a first elastic damping element (101) and a second elastic damping element (102). The first elastic damping element (101) and the second elastic damping element (102) are each provided with two elastic damping elements.

7. The apparatus according to claim 5, characterized in that: An intake pressure regulating channel (106) is fixedly installed on the chassis (103). An intake sound insulation cover (105) is installed at the intake port of the intake pressure regulating channel (106). The intake pressure regulating channel (106) is set to correspond to the intake port of the engine (107).

8. The apparatus according to claim 5, characterized in that: A muffler (104) is installed at the exhaust passage of the engine (107); sound-absorbing material is attached around the engine (107) and compressor (202). The engine (107) and compressor (202) are collectively referred to as the unit. Sound-absorbing material is provided on the inner side of the surrounding plate of the unit.

9. The apparatus according to claim 5, characterized in that: The compressor (202) is an open scroll compressor; the chassis (103) is an integral chassis; the heat pump unit also includes a first fan (108) and a second fan (113).

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