Noise reduction system and vacuum toilet

Abstract

The present invention provides a noise reduction system and a vacuum toilet collection tank, which relate to the technical field of vacuum toilet collection tanks and are used to solve the technical problem that the noise reduction system has a poor noise reduction effect. The noise reduction system includes: a trigger switch, a signal processor and a speaker. The trigger switch is connected to a valve for controlling the opening or closing of the vacuum toilet collection tank. When the trigger switch is turned on, the trigger switch sends a first signal; the signal processor includes an inverted signal generator connected to the trigger switch signal. After the inverted signal generator receives the first signal, after a first preset time, the inverted signal generator sends a first inverted signal; the speaker is connected to the signal processor signal. When the speaker receives the first inverted signal, the speaker sends a first inverted sound wave with a phase opposite to the noise emitted when the vacuum toilet collection tank is discharging sewage. The noise reduction system and vacuum toilet collection tank provided by the present invention are used to improve the noise reduction effect of the noise reduction system.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum toilet collection tanks, and in particular to a noise reduction system and a vacuum toilet collection tank. Background Art

[0002] In the process of railway transportation, in order to meet people's physiological needs, toilets are usually installed on high-speed trains and other motor vehicles. The toilet is equipped with a vacuum toilet, which is equipped with a valve and a vacuum component. The vacuum component will generate a certain negative pressure inside the vacuum toilet. When the vacuum toilet is discharged, the valve opens, and the gas outside the vacuum toilet will flow into the vacuum toilet at a high speed under the action of negative pressure. At the same time, the high-speed flow of gas will flush the dirt into the vacuum toilet. However, the high-speed flow of gas will generate a lot of noise at the valve, which will damage the user's hearing system, so noise reduction treatment is required.

[0003] Generally, a noise reduction system is used to reduce the noise generated by the vacuum toilet during sewage discharge. The noise reduction system includes a speaker, a signal processing circuit, and a sound wave collector. The sound wave collector is used to collect the noise generated by the vacuum toilet during sewage discharge, and convert the noise into an electrical signal and transmit it to the signal processing circuit; the signal processing circuit outputs a corresponding inverted signal according to the electrical signal emitted by the sound wave collector; after receiving the inverted signal, the speaker emits an inverted sound wave that is inverted with the noise sound wave, thereby suppressing the noise and achieving a noise reduction effect.

[0004] However, when reducing the noise of the vacuum toilet when discharging sewage, the noise reduction effect of the above-mentioned noise reduction system is poor. Summary of the invention

[0005] In view of the above problems, an embodiment of the present invention provides a noise reduction system and a vacuum toilet tank, which are used to improve the noise reduction effect of the noise reduction system.

[0006] In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

[0007] An embodiment of the present invention provides a noise reduction system, wherein the noise reduction system includes:

[0008] A trigger switch, the trigger switch is connected to a valve for controlling the opening or closing of a vacuum toilet collection tank, and when the trigger switch is turned on, the trigger switch sends a first signal; a signal processor, the signal processor includes an inverted signal generator, the inverted signal generator is connected to the trigger switch signal, after the inverted signal generator receives the first signal, after a first preset time, the inverted signal generator sends a first inverted signal; the first preset time is the time required from the turning on of the trigger switch to the opening of the valve; a speaker, the speaker is connected to the signal processor signal, when the speaker receives the first inverted signal, the speaker sends a first inverted sound wave, the first inverted sound wave is opposite in phase to the noise emitted when the vacuum toilet collection tank is discharging sewage.

[0009] The noise reduction system provided by the embodiment of the present invention has the following advantages:

[0010] The noise reduction system provided by the embodiment of the present invention includes a trigger switch, a signal processor and a speaker. The trigger switch is connected to a valve for controlling the opening or closing of a vacuum toilet collection tank. When the trigger switch is turned on, the trigger switch can send out a first signal; after the inverted signal generator receives the first signal, at the same time when the above-mentioned valve is opened, the inverted signal generator sends out a first inverted signal; when the speaker receives the first inverted signal, it sends out a first inverted sound wave with a phase opposite to the noise emitted when the vacuum toilet collection tank is discharging sewage. With such an arrangement, when the vacuum toilet collection tank starts to discharge sewage, the speaker can quickly emit the first inverted sound wave, reducing the delay of the first inverted sound wave relative to the noise generated when the vacuum toilet collection tank is discharging sewage, thereby improving the effect of the first inverted sound wave on the noise cancellation, and improving the noise reduction effect of the noise reduction system.

[0011] The noise reduction system as described above, wherein the noise reduction system also includes a drain valve position sensor, which is signal-connected to the inverting signal generator, and is used to detect the position information of the valve; when the drain valve position sensor detects that the valve is in an open position, the drain valve position sensor sends an open signal to the inverting signal generator; when the inverting signal generator receives the first signal and the open signal, the inverting signal generator sends the first inverting signal.

[0012] The noise reduction system as described above, wherein the drain valve position sensor is a proximity sensor

[0013] The noise reduction system as described above, wherein the noise reduction system also includes a sound wave collector; the signal processor also includes a signal processing circuit, and the signal processing circuit is respectively connected to the inverted signal generator, the sound wave collector and the speaker signal; the sound wave collector collects noise below 70 decibels and sends out a second signal; when the signal processing circuit receives the second signal, the signal processing circuit sends out a second inverted signal; when the speaker receives the second inverted signal, the speaker sends out a second inverted sound wave, and the second inverted sound wave is opposite in phase to the noise collected by the sound wave collector.

[0014] In the noise reduction system as described above, the sound wave collector is a microphone.

[0015] The noise reduction system as described above, wherein the noise reduction system further comprises a power amplifier, and the power amplifier is arranged between the signal processor and the speaker; the power amplifier is respectively connected to the signal processing circuit and the speaker signal.

[0016] The noise reduction system as described above, wherein the noise reduction system further comprises a power amplifier, and the power amplifier is integrated on the signal processor; the power amplifier is respectively connected to the signal processing circuit and the speaker signal.

[0017] The noise reduction system as described above, wherein the noise reduction system also includes a human ear positioning radar, the human ear positioning radar is signal-connected to the signal processing circuit, and the human ear positioning radar is used to collect position information of the human ear and send a third signal; when the signal processing circuit receives the third signal, the signal processing circuit adjusts the first inverted signal and / or the second inverted signal.

[0018] The noise reduction system as described above, wherein the number of the speakers is 2-5.

[0019] The embodiment of the present invention further provides a vacuum toilet collection tank, comprising the noise reduction system as described above. Since the vacuum toilet collection tank comprises the noise reduction system as described above, the vacuum toilet collection tank also has the advantages of the noise reduction system as described above, and the relevant description of the noise reduction system as described above can be referred to for details. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1A schematic diagram of the structure of a noise reduction system provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the principle of a noise reduction system provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the noise reduction system including a drain valve position sensor provided in an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1: signal processor; 2: inverting signal generator;

[0026] 3: signal processing circuit; 4: trigger switch;

[0027] 5: Sound wave collector; 6: Power amplifier;

[0028] 7: Human ear positioning radar; 8: Speaker;

[0029] 9: Drain valve position sensor. DETAILED DESCRIPTION

[0030] The noise reduction system generally used needs to generate an anti-phase sound wave with the opposite phase to the noise only when the sound wave collector receives the noise transmitted from the noise source to the sound wave collector. This will cause a certain time difference between the anti-phase sound wave generated by the noise reduction system and the noise generated by the noise source. The noise generated when the vacuum toilet is discharged is a kind of noise that is generated suddenly and changes in frequency rapidly. Since there is a time difference between the anti-phase sound wave generated by the noise reduction system and the noise generated when the vacuum toilet is discharged, the anti-phase sound wave has a certain delay relative to the noise, and the anti-phase sound wave has a poor effect in canceling the noise, and even causes the anti-phase sound wave and the noise to overlap each other, affecting the noise reduction effect of the noise reduction system.

[0031] In view of the above problems, the embodiment of the present invention sets an inverted signal generator, which is connected to the trigger switch signal. The inverted signal generator can receive the first signal output by the trigger switch, and send a first inverted signal to the speaker when the valve of the vacuum toilet is opened, so that after the valve is opened, the speaker quickly sends out a first inverted sound wave, and the first inverted sound wave is opposite in phase to the noise emitted by the vacuum toilet. Such a design reduces the time difference between the first inverted sound wave and the noise generated when the vacuum toilet is discharged, and reduces the delay of the first inverted sound wave relative to the noise generated when the vacuum toilet is discharged, thereby improving the effect of the first inverted sound wave on the noise cancellation, and improving the noise reduction effect of the noise reduction system.

[0032] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0033] like Figure 1 and Figure 2 As shown, the noise reduction system provided by the embodiment of the present invention includes a trigger switch 4, a signal processor 1 and a speaker 8. The trigger switch 4 is connected to a valve for controlling the opening or closing of the vacuum toilet collection tank. When the trigger switch 4 is turned on, the trigger switch 4 sends a first signal. The trigger switch 4 can be a button switch, an inductive switch or other different types of switches, and the specific situation is more selected according to actual needs. For example, in this embodiment, the trigger switch 4 is a button switch. After the button switch is pressed, the valve is opened after a period of time.

[0034] The signal processor 1 includes an inverted signal generator 2, which is connected to the trigger switch 4 by signal. After the inverted signal generator 2 receives the first signal, after a first preset time, the inverted signal generator 2 sends out a first inverted signal; the first preset time is the time required for the trigger switch 4 to open the valve. The speaker 8 is connected to the signal processor 1 by signal. When the speaker 8 receives the first inverted signal, the speaker 8 sends out a first inverted sound wave, which is opposite in phase to the noise emitted when the vacuum toilet is discharged.

[0035] Specifically, the inverted signal generator 2 is preset with an inverted noise database, which records the information of the inverted noise corresponding to the noise emitted during the sewage discharge process of the vacuum toilet. This information can be obtained by processing the noise emitted during a complete sewage discharge process of the vacuum toilet, or by processing the noise emitted during several complete sewage discharge processes of the vacuum toilet. When the inverted signal generator 2 receives the first signal, after a first preset time, the inverted signal generator 2 sends a corresponding first inverted signal according to the information recorded in the inverted noise database.

[0036] The first inverted signal can be directly transmitted to the speaker 8, or can be transmitted to the speaker 8 through the signal processing circuit 3 in the signal processor 1. The specific situation is selected according to actual needs. For example, in this embodiment, the first inverted signal is transmitted to the speaker 8 through the signal processing circuit 3. The signal processing circuit 3 will be introduced below. This setting can reduce the number of wiring of the noise reduction system and make the noise reduction system more compact.

[0037] The loudspeaker 8 is connected to the signal processor 1. When the loudspeaker 8 receives the first anti-phase signal, the loudspeaker 8 emits a first anti-phase sound wave, which is opposite in phase to the noise emitted by the vacuum toilet when discharging sewage.

[0038] By such an arrangement, when the valve of the above-mentioned vacuum toilet is opened, the speaker 8 can quickly emit a first reverse phase sound wave, that is, the time difference between the first reverse phase sound wave and the noise generated when the vacuum toilet is discharging sewage is reduced, thereby reducing the delay of the first reverse phase sound wave relative to the noise generated when the vacuum toilet is discharging sewage, thereby improving the noise canceling effect of the first reverse phase sound wave and improving the noise reduction effect of the noise reduction system.

[0039] The number of the loudspeakers 8 can be 1, 2, 3, 4, 5, etc., which is selected according to actual needs. Figure 1 As shown, in this embodiment, there are two loudspeakers 8. The two loudspeakers 8 form a loudspeaker array, through which a stereo field can be generated, so that the noise reduction effect is better.

[0040] The loudspeaker 8 can be one of different types of loudspeakers such as a paper cone loudspeaker, a horn loudspeaker, a dome loudspeaker, a magnetic loudspeaker, an ion loudspeaker, etc., and the specific situation is selected according to actual needs.

[0041] like Figure 1 and Figure 3 As shown, in a specific embodiment, the noise reduction system provided by the embodiment of the present invention further includes a drain valve position sensor 9, which is connected to the inverting signal generator 2 by signal, and is used to detect the position information of the above valve. The drain valve position sensor 9 can be one of different types of sensors such as a contactor sensor, a proximity sensor, etc., and the specific situation is selected according to actual needs. For example, in this embodiment, the drain valve position sensor 9 is a proximity sensor.

[0042] When the drain valve position sensor 9 detects that the valve is in the open position, the drain valve position sensor 9 sends an open signal to the inverting signal generator 2; when the inverting signal generator 2 receives the first signal and the open signal, the inverting signal generator 2 sends a first inverting signal.

[0043] When the trigger switch 4 is turned on and the valve is in the open state, the inverted signal generator 2 will send out the first inverted signal, causing the speaker 8 to send out the first inverted sound wave. When the trigger switch 4 is turned on and the valve fails to open, the vacuum toilet cannot generate noise. At the same time, the sewage valve position sensor 9 does not send out an opening signal, the inverted signal generator 2 will not send out the first inverted signal, and the speaker 8 will not send out the first inverted sound wave. This arrangement can prevent the first inverted sound wave generated by the speaker 8 from damaging the user's hearing system when the valve of the vacuum toilet fails.

[0044] like Figure 1 As shown, the signal processor 1 provided in the embodiment of the present invention further includes a signal processing circuit 3, and the signal processing circuit 3 is respectively connected to the anti-phase signal generator 2 and the speaker 8. The signal processing circuit 3 can process the audio signal and can also play the role of transmitting the signal. The signal processing circuit 3 can transmit the first anti-phase signal from the anti-phase signal generator 2 to the speaker 8, so that the speaker 8 generates a first anti-phase sound wave.

[0045] The signal processor 1 provided in the embodiment of the present invention further includes a sound wave collector 5, which is signal-connected to the signal processing circuit 3. The sound wave collector 5 can collect noise below 70 decibels and send out a second signal, which is an electrical signal corresponding to the noise signal collected by the sound wave collector 5. When the signal processing circuit 3 receives the second signal, the signal processing circuit 3 sends out a second inverted signal. When the speaker 8 receives the second inverted signal, the speaker 8 sends out a second inverted sound wave, which is opposite in phase to the noise collected by the sound wave collector 5.

[0046] The sound wave collector 5 can be one of the sound wave collecting devices such as a sound level meter, a sound intensity meter, a microphone, etc., and the specific situation is more selected according to actual needs. For example, in this embodiment, the sound wave collector 5 is a microphone.

[0047] With this arrangement, continuous noise below 70 decibels generated by high-speed trains and other motor vehicles can be collected, and the noise reduction system can generate a corresponding second anti-phase sound wave based on the continuous noise. The second anti-phase sound wave offsets the continuous noise, thereby achieving noise reduction of the continuous noise and improving the comfort of the user.

[0048] like Figure 1 As shown, in a specific embodiment, the noise reduction system further includes a power amplifier 6, which can be arranged between the signal processor 1 and the speaker 8, or can be integrated on the signal processor 1. The power amplifier 6 is respectively connected to the signal processor 1 and the speaker 8, and the power amplifier 6 can amplify the signal from the signal processor 1 and send the amplified signal to the speaker 8, thereby increasing the intensity of the sound waves generated by the speaker 8.

[0049] The noise reduction system provided by the embodiment of the present invention further includes a human ear positioning radar 7, which is signal-connected to the signal processing circuit 3. The human ear positioning radar 7 is used to collect the position information of the human ear and send a third signal, which is an electrical signal corresponding to the human ear position information collected by the human ear positioning radar 7. When the signal processing circuit 3 receives the third signal, the signal processing circuit 3 adjusts the first inverted signal and / or the second inverted signal.

[0050] The signal processing circuit 3 can adjust the strength of the first inverted signal and / or the second inverted signal transmitted to each speaker 8 according to the human ear position information recorded by the third signal. Thus, a sound wave with the same intensity and opposite phase as the noise generated when the vacuum toilet is discharged is generated at the human ear through the speaker array, and the sound wave and the noise generated when the vacuum toilet is discharged are offset, thereby realizing accurate noise reduction of the noise reduction system at the human ear position.

[0051] The embodiment of the present invention further provides a vacuum toilet collection tank, comprising the noise reduction system described in the above embodiment. Since the vacuum toilet collection tank comprises the above noise reduction system, the vacuum toilet collection tank also has the advantages of the above noise reduction system, and the relevant description of the above noise reduction system can be referred to for details.

[0052] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0053] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A noise reduction system, characterized in that: include: A trigger switch, wherein the trigger switch is connected to a valve for controlling the opening or closing of the vacuum toilet collection tank, and when the trigger switch is turned on, the trigger switch sends a first signal; A signal processor, the signal processor comprises an inverting signal generator and a signal processing circuit, the inverting signal generator is connected to the signal processing circuit signal; the inverting signal generator is connected to the trigger switch signal, after the inverting signal generator receives the first signal, after a first preset time, the inverting signal generator sends a first inverting signal; the first preset time is the time required from the trigger switch being turned on to the valve being opened; A speaker, wherein the speaker is signal-connected to the signal processing circuit, and when the speaker receives the first anti-phase signal, the speaker emits a first anti-phase sound wave, and the first anti-phase sound wave is opposite in phase to the noise emitted by the vacuum toilet when the vacuum toilet is discharging sewage; A sound wave collector, the sound wave collector is connected to the signal processing circuit signal; the sound wave collector collects noise below 70 decibels and sends a second signal; when the signal processing circuit receives the second signal, the signal processing circuit sends a second inverted signal; when the speaker receives the second inverted signal, the speaker sends a second inverted sound wave, and the second inverted sound wave is opposite in phase to the noise collected by the sound wave collector; A human ear positioning radar, the human ear positioning radar is connected to the signal processing circuit signal, and the human ear positioning radar is used to collect the position information of the human ear and send a third signal; When the signal processing circuit receives the third signal, the signal processing circuit adjusts the first inverted signal and / or the second inverted signal.

2. The noise reduction system according to claim 1, characterized in that: The noise reduction system further includes a drain valve position sensor, the drain valve position sensor is connected to the anti-phase signal generator signal, and the drain valve position sensor is used to detect the position information of the valve; When the drain valve position sensor detects that the valve is in an open position, the drain valve position sensor sends an opening signal to the inverting signal generator; When the inverted signal generator receives the first signal and the start signal, the inverted signal generator sends out the first inverted signal.

3. The noise reduction system according to claim 2, characterized in that: The drain valve position sensor is a proximity sensor.

4. The noise reduction system according to claim 1, characterized in that: The sound wave collector is a microphone.

5. The noise reduction system according to claim 1, characterized in that: The noise reduction system further comprises a power amplifier, which is arranged between the signal processor and the speaker; the power amplifier is respectively connected to the signal processing circuit and the speaker signal.

6. The noise reduction system according to claim 1, characterized in that: The noise reduction system further comprises a power amplifier, which is integrated on the signal processor; the power amplifier is respectively connected to the signal processing circuit and the speaker signal.

7. The noise reduction system according to claim 1, characterized in that: The number of the loudspeakers is 2-5.

8. A vacuum toilet tank, comprising the noise reduction system according to any one of claims 1 to 7.

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