Abstract: A wind wheel including a plurality of blades and a hub. The plurality of blades each includes an inner edge, an outer edge, a leading edge, and a trailing edge. In a top view of the orthographic projection of the wind wheel, the maximum distance between the center O of the hub and the outer edge of the plurality of blades refers to the outer diameter R; the distance between the center O and the cross point A1 of the inner edge and the leading edge is named R1; the outer edge is connected to the leading edge via an arc; the distance between the center O and a joint A2 of the arc and the leading edge is named R2; and the distances R1, R2, and the outer diameter R satisfy the following conditions: 0.35R?R1?0.45R; 0.8R?R2?0.9R.

Abstract: A wind wheel including a plurality of blades and a hub. The plurality of blades each includes an inner edge, an outer edge, a leading edge, and a trailing edge. In a top view of the orthographic projection of the wind wheel, the maximum distance between the center O of the hub and the outer edge of the plurality of blades refers to the outer diameter R; the distance between the center O and the cross point A1 of the inner edge and the leading edge is named R1; the outer edge is connected to the leading edge via an arc; the distance between the center O and a joint A2 of the arc and the leading edge is named R2; and the distances R1, R2, and the outer diameter R satisfy the following conditions: 0.35R?R1?0.45R; 0.8R?R2?0.9R.

Abstract: An induced draft fan, including a volute including a chamber and an air discharge pipe; and a wind wheel disposed in the chamber of the volute. The wind wheel is connected to and operationally driven by a rotation shaft of a motor. The air discharge pipe is disposed on one side of the volute, and includes an inner pipe and an outer pipe surrounding the inner pipe. The inner pipe of the air discharge pipe communicates with the chamber, to form an air discharge passage. An annular groove is disposed between the inner pipe and the outer pipe; and the outer end of the outer pipe is provided with a curved groove, the curved groove extends axially and circumferentially to divide the outer pipe into a fixed part and a flexible part.

Abstract: An induced draft fan, including a volute including a chamber and an air discharge pipe; and a wind wheel disposed in the chamber of the volute. The wind wheel is connected to and operationally driven by a rotation shaft of a motor. The air discharge pipe is disposed on one side of the volute, and includes an inner pipe and an outer pipe surrounding the inner pipe. The inner pipe of the air discharge pipe communicates with the chamber, to form an air discharge passage. An annular groove is disposed between the inner pipe and the outer pipe; and the outer end of the outer pipe is provided with a curved groove, the curved groove extends axially and circumferentially to divide the outer pipe into a fixed part and a flexible part.

Abstract: A receive coil for MRI includes a stacked pair of coil elements to communicate the respective MR signals therein to the signal processing system in separate channels. This greatly increases image SNR and penetration depth and in parallel imaging. The coils are arranged in a stacked relationship so as to be at least partly and preferably wholly overlapped and lying in the same or closely adjacent planes. The coils include tuning capacitors to a common resonant frequency. The coils are connected by a conductor arranged such that the signals of the first and second coils are decoupled. The conductor can form a common portion of the coils including a capacitance of in the common portion arranged. The coils can be connected by two conductors one of which is a short and the other contains a capacitor. In both cases the connection conductors provide the decoupling.

Abstract: A receive coil for MRI includes a stacked pair of coil elements to communicate the respective MR signals therein to the signal processing system in separate channels. This greatly increases image SNR and penetration depth and in parallel imaging. The coils are arranged in a stacked relationship so as to be at least partly and preferably wholly overlapped and lying in the same or closely adjacent planes. The coils include tuning capacitors to a common resonant frequency. The coils are connected by a conductor arranged such that the signals of the first and second coils are decoupled. The conductor can form a common portion of the coils including a capacitance of in the common portion arranged. The coils can be connected by two conductors one of which is a short and the other contains a capacitor. In both cases the connection conductors provide the decoupling.