发明名称 |
ADVANCED PROOF-OF-ROTATION SWITCH |
摘要 |
A HVAC system (10) employs a gas valve (20) to supply gas for combustion within a heating portion (12) of the system. An exhaust (22) removes combustion products using a motor (28) driven exhaust fan (24). An apparatus (34) controls combustion and uses a sensor (36) for sensing the rotational speed of a motor shaft (26). A switch (T1) is responsive to sensed motor speed to open and close the valve, the valve being opened only if the motor is operating within a predetermined speed range. A first speed discriminator (48A) enables of the switch to open the valve when the motor speed exceeds a first predetermined value. A second speed discriminator (48B) disables the switch to close the valve when motor speed exceeds a second and higher predetermined speed which is indicative of a blocked exhaust, or a fan blade is loose. This latter action insures that a build-up of potentially dangerous exhaust gases cannot occur.
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申请公布号 |
CA2061115(C) |
申请公布日期 |
1996.02.27 |
申请号 |
CA19922061115 |
申请日期 |
1992.02.12 |
申请人 |
EMERSON ELECTRIC CO. |
发明人 |
JONES, ROBERT E.;SNIDER, S. DUKE |
分类号 |
F23N5/24;F23N1/00;F23N1/06;F23N3/08;(IPC1-7):F24F11/00 |
主分类号 |
F23N5/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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