A kind of centrifugal waste heat discharge pump return device for nuclear power
A waste heat discharge pump and reflux device technology, which is applied to components of pumping devices for elastic fluids, non-variable pumps, pumps, etc., can solve the problem of water flow turbulence at the impeller inlet, damage the flow state, and reduce pump life, etc. problems, to achieve the effect of improving water flow turbulence, improving performance and improving efficiency
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Embodiment 1
[0018] The waste heat discharge pump reflux device designed by the present invention, such as figure 1 As shown, on the front cover 1 and the pump body 3, five backflow holes one 2 and five backflow holes two 8 are evenly opened in the circumferential direction, respectively, and are fixedly connected with the two ends of the backflow pipeline 9, as shown in FIG. figure 2 shown. The area of the return hole is 6 times of the gap area between the impeller rear mouth ring 7 and the pump body 3, the pipe section where the 5 return holes 12 is located is 0.8 times the diameter of the impeller inlet in the axial direction, and the center line of the 5 return holes 28 The diameter is the internal diameter of 0.55 times of impeller front mouth ring 12. Return hole one 2 and return hole two 8 are arranged from the vertical center line, and at the same angle θ Circumferential rotation distribution, θ =72°. The liquid flow enters the rear pump cavity from the outlet of the impe...
Embodiment 2
[0020] On the front cover 1 and the pump body 3, 8 return holes are evenly opened in the circumferential direction respectively, and the return hole 1 2 and the return hole 2 8 are respectively fixedly connected with the two ends of the return line 9, such as figure 2 shown. The area of the return hole is 9 times of the gap area between the impeller rear mouth ring 7 and the pump body 3, the distance between the section of the pipe where the 8 return holes 12 is located is 1.2 times the diameter of the impeller inlet in the axial direction, and the 8 return holes 28 centerline The diameter is the internal diameter of 0.65 times of impeller front mouth ring 12. Return hole one 2 and return hole two 8 are arranged from the vertical center line, and at the same angle θ Circumferential rotation distribution, θ =45°. The liquid flow enters the rear pump cavity from the outlet of the impeller 5, flows through the return hole 2 8 on the pump body, flows through the return lin...
Embodiment 3
[0022] On the front cover 1 and the pump body 3, six return holes 1 and 2 are evenly opened in the circumferential direction, and are respectively fixedly connected with the two ends of the return line 9, such as figure 2 shown. The area of the return hole is 7 times of the gap area between the impeller rear mouth ring 7 and the pump body 3, the pipe section where the 6 return holes 12 is located is 1.0 times the diameter of the impeller inlet in the axial direction, and the 6 return holes 28 centerline The diameter is the internal diameter of 0.6 times of impeller front mouth ring 12. Return hole one 2 and return hole two 8 are arranged from the vertical center line, and at the same angle θ Circumferential rotation distribution, θ =60°, such as image 3 shown. The liquid flow enters the rear pump cavity from the outlet of the impeller 5, flows through the return hole 2 8 on the pump body, flows through the return line 9 to the return hole 1 2 of the front cover 1, and...
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