Vacuum generator and negative pressure dust suction device having same
View Patent ↗A vacuum generator may comprise: a generator body provided with an air inlet, a contraction pipe section, an expansion pipe section, a negative pressure generation cavity, and an air outlet that may be sequentially communicated, where in a ventilation direction from the air inlet to the air outlet, a pipe diameter of the contraction pipe section may be gradually decreased, a pipe diameter of the expansion pipe section may be gradually increased, and the negative pressure generation cavity may be constructed to generate an inner cavity jet flow negative pressure when gas ejected from the expansion pipe section flows through the negative pressure generation cavity; wherein the generator body may be further provided with a negative pressure suction flow channel, and the negative pressure suction flow channel may comprise a suction port section and a reduced-diameter flow channel section.
1 . A vacuum generator, comprising:
a generator body provided with an air inlet, a contraction pipe section, an expansion pipe section, a negative pressure generation cavity, and an air outlet that are sequentially communicated, wherein in a ventilation direction from the air inlet to the air outlet, a pipe diameter of the contraction pipe section is gradually decreased, a pipe diameter of the expansion pipe section is gradually increased, and the negative pressure generation cavity is constructed to generate an inner cavity jet flow negative pressure when gas ejected from the expansion pipe section flows through the negative pressure generation cavity;
wherein the generator body is further provided with a negative pressure suction flow channel, the negative pressure suction flow channel comprises a suction port section and a reduced-diameter flow channel section, one end of the reduced-diameter flow channel section communicates directly with the negative pressure generation cavity, and the other end communicates with one end of the suction port section, the other end of the suction port section penetrates through a side wall of the generator body, and in an air intake direction of the reduced-diameter flow channel section, a cross-sectional area of the flow channel of the reduced-diameter flow channel section is gradually decreased;
from one end of the negative pressure generation cavity communicating with the expansion pipe section to one end of the negative pressure generation cavity communicating with the air outlet, a cross-sectional area of the flow channel of the negative pressure generation cavity is gradually decreased; and
a cavity wall of the negative pressure generation cavity is a horn-shaped curved wall, and the horn-shaped curved wall is a curved structure enclosed by the motion trajectory of an arc-shaped generatrix when it moves around the central axis.
2 . The vacuum generator according to claim 1 , wherein the reduced-diameter flow channel section is an annular cavity structure arranged around the periphery of the negative pressure generation cavity, an inner side of the annular cavity structure close to the negative pressure generation cavity is provided with a first communication port which is arranged around the periphery of the negative pressure generation cavity and communicates with the negative pressure generation cavity, and an outer side of the annular cavity structure away from the negative pressure generation cavity is provided with a second communication port communicating with the suction port section.
3 . The vacuum generator according to claim 1 , wherein the horn-shaped curved wall protrudes into the cavity of the negative pressure generation cavity.
4 . The vacuum generator according to claim 1 , wherein the reduced-diameter flow channel section is an annular cavity structure arranged around the periphery of the negative pressure generation cavity;
wherein an inner side of the annular cavity structure close to the negative pressure generation cavity is provided with a first communication port which is arranged around the periphery of the negative pressure generation cavity and communicates with the negative pressure generation cavity, the first communication port being in communication with the negative pressure generation cavity;
an outer side of the annular cavity structure away from the negative pressure generation cavity is provided with a second communication port communicating with the suction port section.
5 . The vacuum generator according to claim 4 , wherein the first communication port communicates with one end of the negative pressure generation cavity close to the expansion pipe section, so that the reduced-diameter flow channel section fits with one end of the negative pressure generation cavity close to the expansion pipe section to form a channel structure in which the cross-sectional area of the flow channel is decreased first and then increased.
6 . The vacuum generator according to claim 5 , wherein the arc radius of the arc-shaped generatrix is R, and a width dimension of the first communication port in the direction of the central axis of the reduced-diameter flow channel section is L, where L/R=0.1.
7 . The vacuum generator according to claim 5 , wherein the inner wall of the first communication port is in smooth transition and connection with the inner wall of the negative pressure generation cavity.
8 . The vacuum generator according to claim 1 , wherein from one end of the suction port section penetrating through the side wall of the generator body to one end of the suction port section communicating with the reduced-diameter flow channel section, the cross-sectional area of the flow channel of the suction port section is gradually decreased.
9 . The vacuum generator according to claim 1 , wherein the generator body is an assembled body composed of a plurality of individual parts detachably assembled.
10 . The vacuum generator according to claim 9 , wherein the plurality of individual parts comprises a first individual part, a second individual part, and a third individual part that are detachably connected in sequence;
wherein the air inlet and the contraction pipe section are provided in the first individual part, the expansion pipe section is provided in the second individual part, the negative pressure generation cavity and the air outlet are provided in the third individual part, and the second individual part and the third individual part are assembled and fitted to form the negative pressure suction flow channel.
11 . A negative pressure dust suction device, wherein the negative pressure dust suction device comprises the vacuum generator according to claim 1 , the negative pressure suction flow channel of the vacuum generator is configured for negative pressure dust suction, and the air inlet of the vacuum generator is configured to communicate with an air outlet of an air pump.
12 . The negative pressure dust suction device according to claim 11 , wherein the negative pressure dust suction device further comprises an exhaust pipe in communication with the air outlet of the vacuum generator;
wherein the exhaust pipe is connected in series with a filter and/or a silencer.