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1. 发明专利

JPH09106289A ACTIVE NOISE CONTROLLER 失效
公开(公告)号：JPH09106289A
公开(公告)日：1997-04-22
申请号：JP26557395
申请日：1995-10-13
申请人： DAI DAN CO LTD
发明人： YAMASHITA REIJI , ITO SHUICHI , TANAKA YASUNOBU , AOKI MASAO
IPC分类号： F01N1/00 , F01N1/20 , G05B13/02 , G10K11/16 , G10K11/178
摘要： PROBLEM TO BE SOLVED: To provide an active noise controller in which noise in a duct is precisely detected by reducing the adverse effects caused by the air flow in the duct and the vibration of the duct, making the frequencies of the standing waves which consists of muffling sound waves produced in the direction of the duct cross surface so as to muffle sound in a wide frequency range for a wide diameter duct. SOLUTION: A sensor 16 is placed in the space that is communicative with a duct 11 inner space, is arranged with a space having a cross section shape of an isosceles triangle having one side along the longitudinal direction of the duct 11 outside the duct 11 inner space so as to detect the noise propagating in the duct 11 or the muffling condition in the duct 11. Sound muffling speakers are placed on the faced walls of the duct 11 opposite each other. The speakers radiate sound waves having the same phases and the same sound pressure with each other into the duct and the frequencies of the standing waves produced in the direction of the cross section surface are made higher.

2. 发明专利

JPH07334168A ACTIVE NOISE CONTROL SYSTEM 失效
公开(公告)号：JPH07334168A
公开(公告)日：1995-12-22
申请号：JP12505194
申请日：1994-06-07
申请人： DAI DAN CO LTD
发明人： YAMASHITA REIJI , ITO SHUICHI , TANAKA YASUNOBU , ASAYAMA HIROSHI
IPC分类号： F17D1/20 , G10K11/178
摘要： PURPOSE:To provide a steep frequency cut-off characteristic by using a frequency cut-off filter by a digital signal process for interrupting signals in medium/high frequency areas being out of an object of muffling CONSTITUTION:Noise information in a duct 21 is detected by a first microphone 22, and is digitized by an analog-digital converter 28 to be made the signal only in a low frequency area with the frequency cut-off filter 31. An operation part 36 consisting of a muffle signal generating filter 34 and an adaptive control algorithm 35 forms a muffling signal with a sound pressure same as and a phase opposite to the noise, and makes it analog to radiate a muffling sound wave from a speaker 23 into the duct 21. A second microphone 24 existing on the lower reaches of the muffling speaker 23 detects a muffle condition in the duct 21, and when no noise is made to zero, the analog signal of the noise is digitized, and the operation part 36 forms the muffling signal with the sound pressure same as and the phase opposite to the noise, and the muffling sound wave is radiated from the muffling speaker 23.

3. 发明专利

JPH07334166A ACTIVE NOISE CONTROL SYSTEM 失效
公开(公告)号：JPH07334166A
公开(公告)日：1995-12-22
申请号：JP12504994
申请日：1994-06-07
申请人： DAI DAN CO LTD
发明人： YAMASHITA REIJI , ITO SHUICHI , TANAKA YASUNOBU , ASAYAMA HIROSHI
IPC分类号： F17D1/20 , G10K11/178
摘要： PURPOSE:To provide an active noise control system capable of obtaining precise frequency cut-off in a small time delay, performing precise noise control, shortening a distance between a sensor detecting a noise in a duct and a muffling speaker and making a compact. system. CONSTITUTION:This system is constituted so that signals obtained from a first microphone 2 detecting the noise propagating through the duct 1 and a second microphone 4 detecting a muffle condition in the duct 1 are analog signal processed and digital signal processed, and only the signals with a frequency area to be made into an object of muffle are inputted to an operation part 19, and after a muffling signal formed by the operation part 19 is digital signal processed and analog signal processed, and is made only the signal with the frequency area to be made into the object of muffle, it is digital-analog converted to be inputted to the muffling speaker 3.

4. 发明专利

JP2002089935A PRIMARY/SECONDARY PUMP TYPE HEAT SOURCE VARIABLE FLOW RATE SYSTEM 失效
公开(公告)号：JP2002089935A
公开(公告)日：2002-03-27
申请号：JP2000282360
申请日：2000-09-18
申请人： DAI DAN CO LTD
发明人： AIDA TORU , ITO SHUICHI , KASHIWAGI NORIHITO , NAKAI SHOICHI
IPC分类号： F24F11/02
摘要： PROBLEM TO BE SOLVED: To provide a primary/secondary pump type heat source variable flow rate system for performing economic and energy saving heat source control with excellent responsiveness to the disturbance of heat medium temperature conditions. SOLUTION: The system comprises an air conditioner 15 for processing an air conditioning load, a cold and hot water generator 11 for supplying cold and hot water to the air conditioner 15, a cooling tower 13 for supplying cooling water to the cold and hot water generator 11, a bypass pipe 20 for connecting a cold and hot water supply pipe 25 and a cold and hot water return pipe 21, and a pump variable flow race controller 22 for circulating and supplying the cold and hot water and the cooling water in accordance with the air conditioner 15 by variable control of a cold and hot water primary pump 12 such that the flow rate of the bypass pipe 20 becomes a predetermined value.

5. 发明专利

JP2544900B2 失效
公开(公告)号：JP2544900B2
公开(公告)日：1996-10-16
申请号：JP12546594
申请日：1994-06-07
申请人： DAI DAN CO LTD
发明人： YAMASHITA REIJI , ITO SHUICHI , TANAKA YASUNOBU , ASAYAMA HIROSHI
IPC分类号： F01N1/06 , F24F13/02 , G10K11/16 , G10K11/178 , H04R1/28

6. 发明专利

JP2544899B2 失效
公开(公告)号：JP2544899B2
公开(公告)日：1996-10-16
申请号：JP12504994
申请日：1994-06-07
申请人： DAI DAN CO LTD
发明人： YAMASHITA REIJI , ITO SHUICHI , TANAKA YASUNOBU , ASAYAMA HIROSHI
IPC分类号： F17D1/20 , G10K11/178

7. 发明专利

JPH07334174A SPEAKER INSTALLING DEVICE OF ACTIVE NOISE CONTROL SYSTEM. 失效
公开(公告)号：JPH07334174A
公开(公告)日：1995-12-22
申请号：JP12546694
申请日：1994-06-07
申请人： DAI DAN CO LTD
发明人： YAMASHITA REIJI , ITO SHUICHI , TANAKA YASUNOBU , ASAYAMA HIROSHI
IPC分类号： F01N1/00 , F24F13/02 , G10K11/16 , G10K11/178
摘要： PURPOSE:To improve a silencing effect by installing a speaker for silencing at a bent part of a duct, thereby making it possible to bring the noises in the duct and sound waves for silencing into collision against each other without having an angle. CONSTITUTION:The wall surface in the bent part of the duct 1 having the bent part is provided with the speaker 3 for silencing toward a noise source direction. The sound waves for silencing radiated into the duct 1 from the speaker 3 for silencing are radiated in a direction opposite to the progressing direction of the noise sound waves. The wall surface of the duct 1 nearer the noise source side than the speaker 3 for silencing is provided with a first microphone and is mounted with a second microphone on the opposite side across the speaker 3 for silencing. The noise sound waves 22 and the sound waves 21 for silencing collide against each other at the front surface and generate sound wave interference according to such constitution. Since the sound waves of the low-frequency region propagating in the form of plane waves collide at the front surfaces the efficient sound wave interference is generated.

8. 发明专利

JPH07334173A SOUND WAVE RADIATOR FOR SILENCING OF ACTIVE NOISE CONTROL SYSTEM 失效
公开(公告)号：JPH07334173A
公开(公告)日：1995-12-22
申请号：JP12546594
申请日：1994-06-07
申请人： DAI DAN CO LTD
发明人： YAMASHITA REIJI , ITO SHUICHI , TANAKA YASUNOBU , ASAYAMA HIROSHI
IPC分类号： F01N1/06 , F24F13/02 , G10K11/16 , G10K11/178 , H04R1/28
摘要： PURPOSE:To form a sound field which averts the generation of standing waves in a duct and has the same frequency as the frequency of a signal for silencing in the duct by providing the wall surface part of the duct to be installed with a speaker for silencing with plural partition walls extending radially in the duct from the speaker for silencing to divide the inside of the duct to passages having irregular-shaped sections. CONSTITUTION:The wall surface at the bottom of the duct 1 is provided with the speaker 3 for silencing so as to radiate sound waves for silencing within the duct 1. The wall surface part of the duct l installed with the speaker 3 for silencing is provided with the plural partition walls 21 extending radially in the duct from the speaker 3 for silencing by using thin sheet materials, by which the inside of the duct 1 is divided to the passages having the irregular- shaped sections. The sound waves for silencing radiated from the speaker 3 for silencing into the duct 1 generate reflection within the irregular sections, thereby preventing generation of the standing waves in the duct 1 according to such constitution.

9. 发明专利

JPH07334171A SPEAKER INSTALLING DEVICE FOR SILENCING OF ACTIVE NOISE CONTROL SYSTEM 失效
公开(公告)号：JPH07334171A
公开(公告)日：1995-12-22
申请号：JP12546394
申请日：1994-06-07
申请人： DAI DAN CO LTD
发明人： YAMASHITA REIJI , ITO SHUICHI , TANAKA YASUNOBU , ASAYAMA HIROSHI
IPC分类号： F01N1/00 , F24F13/02 , G10K11/16 , G10K11/178
摘要： PURPOSE:To avert sound wave interference and to improve a silencing effect by providing a duct wall surface facing a speaker for silencing which generates sound waves for silencing with a sound absorbing material. CONSTITUTION:The speaker 3 for silencing which generates sound waves for silencing is disposed in the aperture 20 of the wall surface of the duct 1 so as to radiate the sound waves 22 for silencing in the duct 1. The wall surface of the duct 1 facing the speaker 3 is provided with the sound absorbing material 21. The sound waves 22 for silencing radiated from the speaker 3 for silencing are absorbed by the sound absorbing material 21 according to such constitution and, therefore, the sound waves returning to the speaker 3 for silencing after reflection are decreased. Then, the sound wave interference generated between the wall surface installed with the speaker 3 for silencing and the wall surface of the duct 1 facing the wall surface is averted and the sound waves having the same frequency characteristic as the frequency characteristic of the signal for silencing are radiated in the duct 1.

10. 发明专利

JP2001147056A SOIL HEAT UTILIZATION SYSTEM BY FOUNDATION PILLAR 失效
公开(公告)号：JP2001147056A
公开(公告)日：2001-05-29
申请号：JP32991999
申请日：1999-11-19
申请人： UNICOM KIKAKU SEKKEI KK , DAIDO CONCRETE , DAI DAN CO LTD
发明人： HARA TETSUHIRO , KOJIMA KAZUHIRO , ITO SHUICHI
IPC分类号： E02D5/30 , F24J3/08 , F25B27/00 , F25B30/06
摘要： PROBLEM TO BE SOLVED: To provide an economical soil heat utilization system that prevents a heating medium from leaking without having to construct a characteristic heat-conducting pipe for utilizing soil heat by utilizing a foundation pillar which is buried in the earth as the heat-conducting pipe, when a building is constructed. SOLUTION: The system is equipped with a foundation pillar that is buried in the earth when a building is constructed, a double tube where external and internal tubes with different quality of material are provided coaxially in the foundation pillar, and a circulation pump that is distributed through the gap between the external and internal tubes of the double tube and the internal tube, for circulating a heating medium in a heat pump.

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