CN106194703B - Micro-metering Pumps pump shaft - Google Patents

Abstract

The invention discloses a kind of Micro-metering Pumps pump shafts, it is made of splined shaft portion, the first cylinder shaft portion, the first cylindrical shaft and oblique slot part, the first cylinder ring shaft portion, quantitative slot circular shaft part, the second cylinder ring shaft portion, the second cylindrical shaft and oblique slot part, the second cylinder shaft portion, it is characterised in that splined shaft portion cross sectional shape is spline；First cylinder shaft portion, the second cylindrical shaft portion cross-sectional shape are circle；First cylindrical shaft and oblique slot part, the second cylindrical shaft and oblique slot partial shape outer end are cylindrical shaft, and inside is oblique slot；First cylinder ring shaft portion, the second cylinder ring shaft portion shape are cylinder annulate shaft；Quantitative slot circular shaft portion cross-sectional shape is two quantitative slots uniformly distributed on circular shaft.

Description

Micro metering pump pump shaft

technical field

The invention relates to the field of liquid metering equipment, in particular to a pump shaft of a micro metering pump.

Background technique

The metering pump is a special pump that can meet the needs of various strict technological processes, the flow rate can be adjusted, and it is used to transport liquid. Because of the different power drive and fluid delivery methods, metering pumps are divided into plunger metering pumps, diaphragm metering pumps, rotor pumps, peristaltic pumps, etc.

1. Plunger metering pump

The plunger of the plunger metering pump is in direct contact with the conveyed medium during the reciprocating linear motion, and completes the suction and discharge of liquid under the action of the inlet and outlet check valves.

Features of plunger metering pump

1) When the outlet pressure changes, the flow rate is almost constant;

2) It can transport high-viscosity medium, not suitable for transporting corrosive slurry and dangerous chemicals.

3) Leakage cannot be avoided at the packing seal.

2. Diaphragm metering pump

Diaphragm metering pumps deliver liquid by squeezing the diaphragm. Diaphragm pumps include hydraulic diaphragm pumps, mechanically driven diaphragm pumps, and electromagnetic diaphragm pumps.

The hydraulic diaphragm pump uses the reciprocating movement of the plunger in the oil cylinder to make the oil in the cavity generate pulsating force, push the diaphragm to agitate back and forth, and complete the purpose of sucking and discharging liquid under the action of the inlet and outlet valves.

The sliding rod of the mechanically driven diaphragm metering pump is directly connected to the diaphragm. When the sliding rod reciprocates during work, it directly pushes (pulls) the diaphragm to agitate back and forth, and completes the purpose of suction and discharge through the opening and closing of the one-way valve on the pump head.

The electromagnetic diaphragm metering pump is driven by an electromagnet, which pushes the diaphragm to agitate back and forth, and completes the purpose of sucking and discharging liquid under the action of the inlet and outlet valves.

Diaphragm metering pump features

1) No dynamic seal, no leakage;

2) It can transport high-viscosity medium, abrasive slurry and dangerous chemicals;

3) The diaphragm bears high stress, and the life of the diaphragm is low;

4) When the outlet pressure is below 2 MPa, the application range of the flow rate is small; the measurement accuracy is ±5%, and when the pressure is from the minimum to the maximum, the flow rate can change by up to 10%.

3 rotor pump

The rotor pump achieves the purpose of delivering fluid by means of the periodic conversion of multiple fixed volume delivery units in the working chamber.

Rotary pump features:

1) Long service life;

2) Stable operation and low noise;

3) The seal is reliable. Due to the low speed of the rotor pump, the sealing surface is not easy to generate high temperature and has less wear and tear.

4 peristaltic pumps

Peristaltic pumps pump fluid by alternately squeezing and releasing the elastic delivery hose of the pump by rollers.

Peristaltic pump features:

1) Constant flow, high precision, adjustable flow; 2) Self-priming capability; 3) Peristaltic pump will generate pulses;

4) The peristaltic pump tube is a vulnerable part.

In some fine chemical and food processing techniques, some ingredients are added in a small amount, but the accuracy of the added amount is required to be high. This requires the metering pump to have a small flow rate, accurate cut-off, and a switch function. Compared with the above metering pumps, only the peristaltic pump is the only metering pump with accurate cut-off switch function in the pump body structure. The pump wheel stops and the liquid flow is cut off. The one-way valve is used to cut off the liquid flow, and the effect of the rotary pump is poor. Therefore, a micro metering pump with simple structure, good sealing performance, small flow rate and switch function has been developed, as shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5. It consists of a motor reducer, a pump body, Composed of a pump shaft and an end cover, the invention is a micro metering pump pump shaft.

In view of the above problems, through patent inquiry, there is no identical micro metering pump pump shaft.

Contents of the invention

The technical problem to be solved by the present invention is to provide a pump shaft of a micro metering pump aiming at the current state of the prior art.

The technical solution adopted by the present invention to solve the above problems is: the pump shaft of the micro metering pump, as shown in Figure 6, Figure 7, Figure 8, and Figure 9, consists of a spline shaft part 1, a first cylinder shaft part 2, a first cylinder Shaft and oblique groove part 3, first cylindrical ring shaft part 4, quantitative groove circular shaft part 5, second cylindrical ring shaft part 6, second cylindrical shaft and oblique groove part 7, and second cylindrical shaft part 8, It is characterized in that the cross-sectional shape of the spline shaft part 1 is a spline; the cross-sectional shape of the first cylindrical shaft part 2 and the second cylindrical shaft part 8 is circular; the first cylindrical shaft and the oblique groove part 3, the second cylindrical shaft and the oblique The outer end of the shape of the groove part 7 is a cylindrical shaft, and the inside is an oblique groove; the shape of the first cylindrical ring shaft part 4 and the second cylindrical ring shaft part 6 is a cylindrical ring shaft; Two quantitative grooves are evenly distributed on the surface of the circular shaft along the circumferential direction; the spline shaft part 1, the first cylindrical shaft part 2, the first cylindrical shaft and the oblique groove part 3, the first cylindrical ring shaft part 4, the circular shaft part of the quantitative groove 5, The second cylindrical ring shaft part 6, the second cylindrical shaft and oblique groove part 7, and the second cylindrical shaft part 8 are arranged in sequence from left to right.

Compared with the prior art, the present invention has the beneficial effects that the pump shaft is quantified by a quantitative groove, the measurement is accurate, and it has the function of a cut-off switch.

Description of drawings

Fig. 1 is the main sectional view of the micro metering pump of the present invention;

Fig. 2 is a top view of the micro metering pump of the present invention;

Fig. 3 is the bottom view of the micro metering pump of the present invention;

Fig. 4 is the left sectional view of A-A of micro metering pump of the present invention;

Fig. 5 is the B-B left sectional view of micrometering pump of the present invention;

Fig. 6 is the front view of the pump shaft of the micro metering pump of the present invention;

Fig. 7 is the left side view of the pump shaft of the micro metering pump of the present invention;

Fig. 8 is A-A left sectional view of the pump shaft of the micro metering pump of the present invention;

Fig. 9 is a B-B left sectional view of the pump shaft of the micro metering pump of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

The pump shaft of the micrometering pump, as shown in Figure 6, Figure 7, Figure 8, and Figure 9, consists of a spline shaft part 1, a first cylindrical shaft part 2, a first cylindrical shaft and an inclined groove part 3, a first cylindrical ring The shaft part 4, the quantitative groove circular shaft part 5, the second cylindrical ring shaft part 6, the second cylindrical shaft and the oblique groove part 7, and the second cylindrical shaft part 8 are characterized in that the cross-sectional shape of the spline shaft part 1 is flower The key is used to connect with the motor reducer; the cross-sectional shape of the first cylindrical shaft part 2 and the second cylindrical shaft part 8 is circular, and is used for fixing with the pump body; the first cylindrical shaft and the inclined groove part 3, the second cylindrical shaft The outer end of the shaft and the inclined groove part 7 is a cylindrical shaft, which acts as a seal, and the inner part is an inclined groove, which promotes the liquid inward and acts as a flow resistance; the first cylindrical ring shaft part 4, the second cylindrical ring shaft part 6. The shape is a cylindrical ring shaft, which plays a role of sealing; the section shape of the round shaft part 5 of the quantitative groove is a circular shaft, and two quantitative grooves are evenly distributed on the surface of the round shaft along the circumferential direction, which plays a quantitative role; the spline shaft part 1, the first cylindrical shaft Part 2, the first cylindrical shaft and oblique groove part 3, the first cylindrical ring shaft part 4, the quantitative groove circular shaft part 5, the second cylindrical ring shaft part 6, the second cylindrical shaft and the oblique groove part 7, the second The cylindrical shaft parts 8 are arranged sequentially from left to right.

Micro metering pump pump shaft working principle

1. Quantitative, there is a quantitative groove in the middle part of the pump shaft, and the quantitative groove plays the role of volume quantitative;

2. Metering, the pump shaft rotates once, there are two quantitative tanks, and the metering is carried out according to the number of revolutions of the shaft;

3. The switch, the pump shaft cooperates with the pump body, which is equivalent to a stop valve;

4. Sealing, the pump shaft cooperates with the pump body and can be self-sealing.

pump shaft manufacturing process

1. Stainless steel bar blanking;

2. Drill the top pinhole;

3. Rough turning all axles;

4. Full axle of fine car;

5. Coarse grinding of the whole shaft;

6. Machining splines, oblique grooves and quantitative grooves on the machining center; 7. Heat treatment of the whole shaft;

8. Fine grinding the whole shaft.

Claims (1)

1. The pump shaft of micro metering pump consists of spline shaft part (1), first cylindrical shaft part (2), first cylindrical shaft and inclined groove part (3), first cylindrical ring shaft part (4), quantitative The grooved circular shaft part (5), the second cylindrical ring shaft part (6), the second cylindrical shaft and the oblique groove part (7), and the second cylindrical shaft part (8), are characterized in that the spline shaft part (1 ) cross-sectional shape is a spline; the cross-sectional shape of the first cylindrical shaft part (2) and the second cylindrical shaft part (8) is circular; the first cylindrical shaft and the oblique groove part (3), the second cylindrical shaft and the oblique The outer end of the groove part (7) is a cylindrical shaft, and the inside is an oblique groove; the shape of the first cylindrical ring shaft part (4) and the second cylindrical ring shaft part (6) are cylindrical ring shafts; the circular shaft part of the quantitative groove (5 ) cross-sectional shape is a circular shaft, and two quantitative grooves are uniformly distributed along the circumferential direction on the surface of the circular shaft; the spline shaft part (1), the first cylindrical shaft part (2), the first cylindrical shaft and the oblique groove part (3), the first Cylindrical ring shaft part (4), quantitative groove circular shaft part (5), second cylindrical ring shaft part (6), second cylindrical shaft and inclined groove part (7), second cylindrical shaft part (8) from left Arranged in order from right to left; Quantitative, there is a quantitative groove in the middle part of the pump shaft, and the quantitative groove plays the role of volume quantitative; Metering, the pump shaft rotates once, there are two quantitative grooves, and the metering is performed according to the number of revolutions of the shaft; Switch, the pump shaft and The pump body cooperates, which is equivalent to a stop valve; the seal, the pump shaft cooperates with the pump body, and can be self-sealing.