CN109296515B

CN109296515B - Double-feeding type conveying pump

Info

Publication number: CN109296515B
Application number: CN201811022505.2A
Authority: CN
Inventors: 栾飞; 何登先; 本金翠; 李富康; 刘一凡; 李晶; 桓源
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2018-09-03
Filing date: 2018-09-03
Publication date: 2020-12-08
Anticipated expiration: 2038-09-03
Also published as: CN109296515A

Abstract

The invention discloses a double-feeding type delivery pump which comprises a pump body, wherein a worm, a worm wheel in transmission fit with the worm and two eccentric shafts connected to two ends of a turbine shaft of the worm wheel are rotationally arranged in the pump body, and one end of the worm is connected with a rotating shaft of a motor; the outer side of the pump body is provided with two pump cylinders, each pump cylinder is internally provided with a piston sleeve, a piston is arranged in each piston sleeve, one end of each piston is connected with a piston rod, one end of each piston rod extends into the pump body, a spring retainer is arranged on the end of each piston rod, and the spring retainers are in periodic transmission fit with corresponding eccentric shafts. The double-feeding type conveying pump can simultaneously convey double materials.

Description

Double-feeding type conveying pump

Technical Field

The invention belongs to the technical field of chemical raw material conveying equipment, and particularly relates to a double-feeding type conveying pump.

Background

N2H4 (hydrazine), also known as hydrazine and diammonium, is a colorless fuming, corrosive and strongly reducing colorless oily liquid, highly toxic and extremely unstable, and has a pungent odor similar to ammonia. It is mainly used as fuel part of rocket and jet engine, and can also be used as raw material for preparing pharmaceuticals, such as semicarbazide, isoniazid, nitrofural, and chlorothalonil, and can be used in preparing salts (such as sulfate) and organic derivatives. NH3 (ammonia gas) is a colorless gas with strong pungent odor, is easily dissolved in hydrogenated nitrogen and is easy to liquefy, and liquid ammonia can be used as refrigerant, mainly for preparing nitrogen fertilizer (urea, ammonium bicarbonate, etc.), HNO3, ammonium salt, soda ash, synthetic fiber, plastic, dye, etc.

At present, no feeding pump specially used for conveying nitrogen hydride such as N2H4, NH3 and the like exists, so that the improvement of the traditional pump to the development of the nitrogen hydride is beneficial to the current industrial production and has great significance to the industrial production.

Disclosure of Invention

The invention aims to provide a double-feed type delivery pump which is specially used for simultaneously delivering a plurality of kinds of hydrogenated nitrogen such as N2H4, NH3 and the like.

In order to achieve the purpose, the technical scheme adopted by the invention is that the double-feeding type conveying pump comprises a pump body, wherein a worm, a worm wheel in transmission fit with the worm and two eccentric shafts connected to two ends of a turbine shaft of the worm wheel are rotationally arranged in the pump body, and one end of the worm is connected with a rotating shaft of a motor; two pump cylinders are arranged on the outer side of the pump body, a piston sleeve is arranged in each pump cylinder, a piston is arranged in each piston sleeve, one end of each piston is connected with a piston rod, one end of each piston rod extends into the pump body, a spring retainer is arranged on the end of each piston rod, the spring retainers are periodically in transmission fit with corresponding eccentric shafts, a piston bush is arranged between each pump body and each piston rod, the outer edge of each piston bush is provided with a step, a compression spring is respectively arranged between each step and the corresponding spring retainer, the other end of each piston rod is provided with a piston, a piston sleeve is sleeved outside each piston, a sleeve body is arranged between each pump cylinder and the pump body, the upper part of each pump cylinder is provided with a suction inlet, the lower part of each pump cylinder is provided with a discharge outlet, and a plurality of ball retainers are arranged in the suction inlet and, each ball retainer is provided with a sealing steel ball therein.

The technical scheme of the invention also has the following characteristics:

two ball retainers are arranged in the suction inlet and the discharge outlet.

The piston is fixed to the other end of the two piston rods by a piston connector.

The worm and the turbine are rotatably arranged in the pump body through a pair of bearings.

The pump further comprises two stroke regulators, each stroke regulator is externally provided with an adjusting nut, and each adjusting nut is assembled in the pump body in a threaded mode.

The worm is connected with a rotating shaft of the motor through a coupler, and the coupler is located in the box body.

The suction inlet is provided with a lower connecting pipe, and the discharge outlet is provided with an upper connecting pipe.

One eccentric shaft is arranged on one side of the turbine shaft, and the other eccentric shaft is arranged on the other side of the turbine shaft.

The invention has the beneficial effects that: (1) the double-feeding type delivery pump has the advantages of simple integral structure, safe and reliable use and convenient installation; (2) the double-feeding type delivery pump has the advantages of high measuring range, large flow and compact structure, and can always keep higher efficiency; (3) according to the double-feeding type delivery pump, the sealing steel balls are adopted for plugging, so that the blockage is not easy to occur; (4) the double-feeding type conveying pump can simultaneously convey double materials.

Drawings

FIG. 1 is a front view of a dual feed transfer pump of the present invention;

fig. 2 is an axial view of fig. 1.

In the figure, 1, a pump body, 2, a box body, 3, a rotating shaft, 4, a coupling, 5, a worm, 6, a bearing, 7, a turbine, 8, a piston bush, 9, a piston connector, 10, a piston, 11, a lower connecting pipe, 12, a pump cylinder, 13, a ball retainer, 14, an upper connecting pipe, 15, a sealing steel ball, 16, a piston sleeve, 17, a sleeve body, 18, a piston rod, 19, a compression spring, 20, a spring retainer, 21, an eccentric shaft, 22, a stroke adjuster and 23 adjusting nuts.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the description of the attached drawings and the specific embodiment.

As shown in fig. 1, the double-feed type delivery pump of the present invention comprises a pump body 1, wherein a worm 5, a turbine 7 in transmission fit with the worm 5, and two eccentric shafts 21 connected to two ends of a turbine shaft of the turbine 7 are rotatably arranged in the pump body 1, and one end of the worm 5 is connected to a rotating shaft 3 of a motor; two pump cylinders 12 are arranged outside the pump body 1, a piston sleeve 16 is arranged in each pump cylinder 12, a piston 10 is arranged in each piston sleeve 16, one end of each piston 10 is connected with a piston rod 18, one end part of each piston rod 18 extends into the pump body 1, a spring retainer 20 is arranged on the end part, each spring retainer 20 is in periodic transmission fit with a corresponding eccentric shaft 21, a piston bush 8 is arranged between the pump body 1 and each piston rod 18, the outer edge of each piston bush 8 is provided with a step, a compression spring 19 is respectively arranged between each step and the corresponding spring retainer 20, the other end of each piston rod 18 is provided with one piston 10, a piston sleeve 16 is sleeved outside each piston 10, a sleeve body 17 is arranged between each pump cylinder 12 and the pump body 1, the upper part of each pump cylinder 12 is provided with a suction inlet, the lower part of each pump cylinder 12 is provided with a discharge outlet, and the discharge outlet are respectively provided with a, a sealing steel ball 15 is arranged in each ball retainer 13.

When the reciprocating linear compressor works, the motor is started, the rotating shaft 3 of the motor drives the worm 5 to rotate at the moment, the worm wheel 7 meshed with the worm 5 rotates, and the two eccentric shafts 21 are respectively connected to two ends of a turbine shaft of the worm wheel 7, so that when the turbine shaft rotates, each eccentric shaft 21 can periodically push the corresponding piston rod 18, and at the moment, the piston rod 18 drives the corresponding piston 10 to do reciprocating linear motion under the cooperation of the compression spring 20. When the piston rod 18 moves from left to right, the volume of the working chamber is gradually increased to form low pressure, the ball retainer 13 close to the suction inlet is opened, the ball retainer 13 close to the discharge outlet is closed, and nitrogen oxide is sucked from the suction inlet; when the piston rod 18 moves from right to left, the volume of the working chamber gradually decreases, so that the pressure increases, at which time the ball retainer 13 near the suction port is closed, the ball retainer 13 near the discharge port is opened, and the hydrogenated nitrogen stops being sucked from the suction port and is instead discharged from the discharge port.

As shown in fig. 1, the number of the ball retainers 13 is four, two of the ball retainers 13 are close to the suction port and are distributed up and down to control the opening and closing of the suction port by the double-layer switch, and the other two ball retainers 13 are close to the discharge port and are also distributed up and down to control the discharge by the double-layer switch.

As shown in fig. 1, the piston 10 is fixed at the other end of the two piston rods 18 through the piston connector 17, and the driving force is increased through the driving of the two piston rods 18, and the stress is balanced to ensure the smooth operation.

As shown in fig. 1, the worm 5 and the worm wheel 7 are rotatably mounted in the pump body 1 through a pair of bearings 6, that is, the outer ring of the bearing 6 is fixed between the inner walls of the pump body 1, and the worm 5 and the worm wheel 7 are fixed to the inner ring of the bearing 6.

As shown in fig. 2, the pump further comprises two stroke adjusters 22, each stroke adjuster 22 is externally provided with an adjusting nut 23, and each adjusting nut 23 is threadedly assembled in the pump body 1.

The end of the stroke adjuster 22 bears against the side of the spring holder 20, and the principle is to change the stroke of the piston 10 by limiting the maximum right-hand displacement of the piston rod 18, in particular by controlling the amount of screwing of the adjusting nut 23.

As shown in fig. 1, the worm 5 is connected with the rotating shaft 3 of the motor through the coupling 4, and the coupling 4 is located in the box body 2, so that the rotating shaft 3 can drive the worm 5 to rotate safely, efficiently and stably.

As shown in fig. 1, the suction port is provided with a lower adapter 11, the lower adapter 11 is communicated with a hydrogenation nitrogen source, the discharge port is provided with an upper adapter 14, the upper adapter 14 is communicated with the delivery position, and the ball retainer 13 is respectively positioned between the lower adapter 11 and the suction port and between the upper adapter 14 and the discharge port.

As shown in fig. 1, one eccentric shaft 21 is disposed on one side of the turbine shaft, and the other eccentric shaft 21 is disposed on the other side of the turbine shaft, so that the overall structure is compact, the stress on the turbine shaft is balanced, and the turbine shaft is stable during operation.

The double-feeding type delivery pump is driven to work by the two pistons 10, one piston 10 moves to the right and the other piston moves to the left during working, and when the turbine 7 rotates for one circle, the two pistons 10 respectively suck and discharge liquid once, so that the flow is more uniform.

Therefore, the double-feeding type delivery pump has the advantages of simple overall structure, safe and reliable use and convenient installation; the double-feeding type delivery pump has the advantages of high measuring range, large flow and compact structure, and can always keep higher efficiency; according to the double-feeding type delivery pump, the sealing steel balls are adopted for plugging, so that the blockage is not easy to occur; the double-feeding type conveying pump can simultaneously convey double materials.

Claims

1. The double-feeding type conveying pump is characterized by comprising a pump body (1), wherein a worm (5) and a turbine (7) in transmission fit with the worm (5) are rotatably arranged in the pump body (1), two ends of a turbine shaft of the turbine (7) are respectively provided with an eccentric shaft (21), and one end of the worm (5) is connected with a rotating shaft (3) of a motor; the outer side of the pump body (1) is provided with two pump cylinders (12), each pump cylinder (12) is internally provided with a piston sleeve (16), a piston (10) is arranged in each piston sleeve (16), one end of each piston (10) is connected with a piston rod (18), one end part of each piston rod (18) extends into the pump body (1), a spring retainer (20) is arranged on the end part, each spring retainer (20) is periodically in transmission fit with a corresponding eccentric shaft (21), a piston bushing (8) is arranged between each pump body (1) and each piston rod (18), the outer edge of each piston bushing (8) is provided with a step, a compression spring (19) is respectively arranged between each step and the corresponding spring retainer (20), the other end of each piston rod (18) is provided with one piston (10), and the piston sleeve (16) is sleeved outside each piston (10), a sleeve body (17) is arranged between each pump cylinder (12) and the pump body (1), the upper part of each pump cylinder (12) is provided with a suction inlet, the lower part of each pump cylinder (12) is provided with a discharge outlet, a plurality of ball holders (13) are arranged in the suction inlet and the discharge outlet, a sealing steel ball (15) is arranged in each ball holder (13), two ball holders (13) are arranged in the suction inlet and the discharge outlet, a lower connecting pipe (11) is arranged on the suction inlet, and an upper connecting pipe (14) is arranged on the discharge outlet; the pump further comprises two stroke regulators (22), each stroke regulator (22) is externally provided with an adjusting nut (23), and each adjusting nut (23) is assembled in the pump body (1) in a threaded mode.

2. The double feed delivery pump according to claim 1, characterized in that the pistons (10) are fixed at the other end of the corresponding piston rods (18) by means of piston connectors (9).

3. The double feed delivery pump according to claim 1, characterized in that the worm (5) and the worm wheel (7) are each rotatably arranged in the pump body (1) by means of a pair of bearings (6).

4. The double feed delivery pump according to claim 1, wherein the worm (5) is connected to the shaft (3) of the motor by means of a coupling (4), the coupling (4) being located inside the tank (2).