A constant volume metering pump
A technology of constant volume metering and pump body, which is applied to machines/engines, mechanical equipment, engine components, etc., can solve the problems of affecting durability, large moving mass, limiting the frequency of reciprocating motion of the plunger, etc., to improve the flow control accuracy. Effect
Active Publication Date: 2019-01-01
福爱电子(贵州)有限公司
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Problems solved by technology
The disadvantage of the metering device is that the plunger is connected head to tail with the armature, the axial dimension is longer, and the moving mass is relatively large. If the friction is provided by the cooperation of the plunger-sleeve, the center of gravity of the moving part will be at In addition to the support friction, the inertia of motion will affect the durability; if a sliding support of the plunger (that is, the magnetic sleeve, MAGNET SLEEVE 67) is arranged at the other end of the spring opposite the sleeve, or a sliding support of the armature is arranged For support, it is necessary to strictly control the coaxiality of the sleeve and the sliding support, which is difficult to manufacture, especially between the sliding support of the plunger and the spring, an additional spring seat (snap ring 68) needs to be arranged, and the installation of the spring seat The process is also more complex
In addition, due to the relatively large mass and friction of the moving parts, the frequency of the plunger's reciprocating motion will be limited
Method used
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[0046] Such as figure 1 As shown, it is one of the structural diagrams of the embodiment of the constant volume metering pump provided by the present invention. The constant volume metering pump 1 includes a pump body 1a and a solenoid device 2 located in the pump body 1a, a plunger pump 12, and a rear Pump end 4, front pump end 10 and return spring 11.
[0047] The solenoid device 2 has a structure satisfying the basic principle of generating electromagnetic driving force, including a solenoid coil 2a, a yoke 2b, a magnetic isolation ring 2c and an armature 3 driven by electromagnetic force. The yoke 2b is arranged around the coil 2a, and the yoke 2a located inside the coil is an inner yoke 2b1, and the inner yoke 2b1 is divided into an upper inner yoke 2b11 and a lower inner yoke 2b12 by a magnetic spacer ring 2c. The yoke 2b11, the lower inner yoke 2b12 and the spacer ring 2c form a roughly cylindrical space for the reciprocating movement of the armature 3, that is, the ar...
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The invention provides a constant-volume metering pump. The constant-volume metering pump comprises a pump body, a solenoid device and a plunger pump, wherein the solenoid device and the plunger pump are located in the pump body. The solenoid device comprises an armature. The plunger pump comprises a sleeve, a plunger, an input valve and an output valve. The sleeve comprises a sleeve inner hole, and the sleeve inner hole is in close fit with the outer surface of the plunger and can slide freely. The interior of the pump body is divided into a low pressure space and a pressure feed space by the plunger pump. Liquid enters the pressure feed space from the low pressure space through the input valve, and then is discharged through the output valve. The constant-volume metering pump is characterized in that the sleeve and the armature are connected and kept reciprocating synchronously, the solenoid driving device drives the sleeve and the plunger to move relatively to enable the liquid to be discharged, and the liquid discharging amount obtained through relative movement between the sleeve and the plunger is limited by the geometric structure.
Description
technical field [0001] The invention belongs to the field of liquid metering technology, especially the liquid injection metering technology related to engine exhaust post-treatment, and specifically relates to a selective catalytic reduction (SCR) system for purifying engine exhaust gas and nitrogen oxides selective catalytic reduction (SCR) system for diesel engine exhaust particulate matter filtration and collection (DPF). Fuel injection regeneration system. Background technique [0002] Engine exhaust purification Nitric oxide selective catalytic reduction (SCR) system and exhaust particulate filter (DPF) system are not only very important for diesel engines, but also have application value for in-cylinder direct injection gasoline engines, both of which involve liquid injection and metering. [0003] Nitrogen oxide selective catalytic reduction (SCR) system needs to spray 32.5% urea water liquid quantitatively into the engine exhaust system. The urea water liquid decomp...
Claims
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IPC IPC(8): F01N3/28F01N3/023
Inventor 郗大光张平乐起奖徐露明杨延相
Owner 福爱电子(贵州)有限公司