Electric cylinder piston type displacement pump

Abstract

The invention relates to the technical field of displacement pumps, and discloses an electric cylinder piston type displacement pump which comprises a base, a pump cavity is formed in the left end of the base, a stock bin communicated with the pump cavity is arranged at the top of the pump cavity, a discharging pipeline is arranged on the left side of the pump cavity, a piston cylinder is arranged in the middle of the base, and a piston of the piston cylinder extends leftwards. And an electric cylinder for driving the piston cylinder is arranged on the right side of the base. According to the electric cylinder piston type displacement pump, the piston is controlled by the two servo motors to alternately pump in the piston cylinder in a reciprocating mode, so that continuous output of materials is achieved, production efficiency is improved, safety production hidden dangers are eliminated, and the electric cylinder piston type displacement pump is high in metering precision, simple in structure, easy to maintain and low in use cost.

Description

Technical Field

[0001] The present invention relates to the technical field of positive displacement pumps, and particularly to an electric cylinder piston type positive displacement pump. Background Art

[0002] Currently, in the production of emulsion explosives, the transportation of emulsion explosives or latex matrix mostly uses screw pumps, gear pumps, twin screw pumps, vane pumps, and a small number use piston pumps driven by hydraulic pressure, cams or cranks. Equipment such as screw pumps, vane pumps, twin screw pumps, and gear pumps have the characteristics of high linear velocity and large rotational friction area, belonging to Class 0 equipment, and their intrinsic safety level needs to be further improved. The reciprocating motion of the piston has the advantages of low linear velocity, no rotational friction motion, and small friction area. Therefore, the piston pumping method is recognized by the civil explosive industry as a transportation method with a high level of intrinsic safety, and it has been applied in processes such as waste drug treatment and emulsion charging in the civil explosive industry.

[0003] The current driving methods of piston pumps mainly include cylinder, hydraulic cylinder, cam and crank mechanism, etc. Since cylinders and hydraulic cylinders use fluid media such as compressed air and hydraulic oil for driving, they have the disadvantages of low control accuracy and poor controllability, and it is difficult to completely solve the pulsation problem during the reciprocating alternation of the piston cylinder. The cam and crank mechanism belongs to linkage drive, and the motion trajectories between the piston cylinders driven by it are solidified after the equipment is processed, and cannot be adaptively adjusted according to the needs of program control. Only by increasing the number of piston cylinders can the magnitude of pulsation be reduced, and the flow pulsation problem during the transportation of piston pumps cannot be fundamentally eliminated. In addition, hydraulic drive has the deficiency of hydraulic oil leakage causing pollution, cylinder drive has the disadvantage of high noise, and the cam and crank drive mechanism has defects such as large floor area, complex structure, inconvenient maintenance, and short reciprocating stroke. The above defects of the traditional driving methods of piston pumps greatly limit the popularization and application of piston pumps in the civil explosive industry, and also limit the improvement of the intrinsic safety level during the transportation of latex matrix or emulsion explosives in the civil explosive industry. In order to solve the problems of unstable output flow, large floor area, and hydraulic oil leakage of traditional piston pumps, and reduce the maintenance cost of pumping equipment, it is necessary to improve the existing positive displacement pump. Summary of the Invention

[0004] The present invention provides an electric cylinder piston type positive displacement pump, which solves the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An electric cylinder piston type positive displacement pump includes a base. A pump chamber is provided at the left end of the base. A material bin communicating with the pump chamber is provided at the top of the pump chamber. An outlet pipeline is provided on the left side of the pump chamber. A piston cylinder is provided in the middle of the base. The piston of the piston cylinder extends to the left, and an electric cylinder for driving the piston cylinder is provided on the right side of the base.

[0007] As a preferred technical solution of the present invention, a fan mounting seat is arranged outside the electric cylinder, and an explosion-proof axial flow fan is arranged on the fan mounting seat.

[0008] As a preferred technical solution of the present invention, a one-way valve cooperating with the silo and the discharge pipeline is arranged on the pump chamber.

[0009] As a preferred technical solution of the present invention, an O-ring seal is arranged outside the piston.

[0010] As a preferred technical solution of the present invention, a temperature transmitter is arranged on the side wall of the silo, and a level transmitter is arranged on the top of the silo.

[0011] As a preferred technical solution of the present invention, a pressure transmitter is arranged on the discharge pipeline.

[0012] The present invention has the following beneficial effects:

[0013] The present invention is applicable to an electric cylinder piston type positive displacement pump. The piston reciprocates alternately in the piston cylinder under the control of two servo motors, so as to realize the continuous output of materials, improve production efficiency, eliminate potential safety hazards in production, have high metering accuracy, simple structure and easy maintenance, and low use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic structural diagram of an electric cylinder piston type positive displacement pump.

[0016] Figure 2 It is a front view of an electric cylinder piston type positive displacement pump.

[0017] Figure 3 It is a left view of an electric cylinder piston type positive displacement pump.

[0018] Figure 4 It is a right view of an electric cylinder piston type positive displacement pump.

[0019] In the figure: 1, base; 2, electric cylinder; 3, fan mounting seat; 4, explosion-proof axial flow fan; 5, piston cylinder; 6, piston; 7, O-ring seal; 8, pump chamber; 9, one-way valve; 10, silo; 11, discharge pipeline; 12, pressure transmitter; 13, temperature transmitter; 14, level transmitter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] In one embodiment, please refer to Figures 1 - 4 , an electric cylinder piston type positive displacement pump, including a base 1. A pump chamber 8 is provided at the left end of the base 1. A material bin 10 communicating with the pump chamber 8 is provided at the top of the pump chamber 8. A discharge pipeline 11 is provided on the left side of the pump chamber 8. A piston cylinder 5 is provided in the middle of the base 1. The piston 6 of the piston cylinder 5 extends to the left, and an electric cylinder 2 for driving the piston cylinder 5 is provided on the right side of the base 1. An explosion-proof servo motor drives the electric cylinder 2 to perform reciprocating linear motion through a speed reducer. The electric cylinder 2 then drives the piston 6 to reciprocate, causing the working volume of the pump chamber 8 to change periodically, realizing the suction and discharge of materials. The positive displacement pump controls the piston 6 to alternately reciprocate and pump in the piston cylinder 5 through two servo motors, thereby realizing the continuous output of materials.

[0022] In one case of this embodiment, a fan mounting seat 3 is provided outside the electric cylinder 2, and an explosion-proof axial flow fan 4 is provided on the fan mounting seat 3. The fan mounting seat 3, the electric cylinder 2, and the pump chamber 8 are fixed to the base 1 through bolts to form an integral body. The explosion-proof axial flow fan 4 is fixed on the fan mounting seat 3 and is located above the servo motor for cooling the servo motor. A compensation function of pressure and piston 6 speed is established at the alternation of the reciprocating motion of the two pistons 6 through a servo control program, eliminating the flow pulsation at the alternation of the reciprocating motion of the two pistons 6, thereby realizing stable output.

[0023] In one case of this embodiment, a check valve 9 cooperating with the material bin 10 and the discharge pipeline 11 is provided on the pump chamber 8. An inlet check valve 9 is installed between the pump chamber 8 and the material bin 10, and an outlet check valve 9 is installed between the pump chamber 8 and the discharge pipeline 11 to realize the one-way flow of materials in the pump chamber 8 and the pipeline.

[0024] In one case of this embodiment, an O-ring seal 7 is provided outside the piston 6. Two seals are installed in two grooves on the piston 6 to prevent material leakage when the piston 6 reciprocates in the piston cylinder 5. O-ring seals 7 are designed between the piston cylinder 5 and the pump chamber 8, and between the material bin 10 and the pump chamber 8 to prevent material leakage.

[0025] In one case of this embodiment, a temperature transmitter 13 is provided on the side wall of the silo 10, and a level transmitter 14 is provided on the top of the silo 10. A pressure transmitter 12 is provided on the discharge pipeline 11. The positive displacement pump is equipped with triple safety interlock protection for level, pressure and temperature. The pressure transmitter 12 can achieve automatic alarm and shutdown in case of ultra-high or ultra-low pressure; the temperature transmitter 13 can monitor the temperature of the pumped material in real time, and in case of abnormal temperature, it will automatically alarm and shutdown; by designing a safety relief port, automatic mechanical explosion relief can be achieved in case of ultra-high pressure, realizing the safety redundancy design for ultra-high pressure during the pumping process. A level transmitter 14 is designed on the silo 10 of the positive displacement pump, and the pump will automatically stop when the level is ultra-low, preventing the pump from running continuously without load. Through the above safety interlock measures, the safe and stable operation of the positive displacement pump is further guaranteed.

[0026] The present invention is applicable to an electro-cylinder piston type positive displacement pump, which controls the piston 6 to reciprocate alternately in the piston cylinder 5 through two servo motors, so as to realize the continuous output of materials, improve production efficiency, eliminate potential safety hazards in production, have high metering accuracy, simple structure and easy maintenance, and low use cost.

[0027] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. An electric cylinder piston type positive displacement pump, characterized in that: It includes a base, a pump chamber is arranged at the left end of the base, a material bin communicated with the pump chamber is arranged at the top of the pump chamber, a discharge pipeline is arranged on the left side of the pump chamber, a piston cylinder is arranged in the middle of the base, the piston of the piston cylinder extends to the left side, and an electric cylinder for driving the piston cylinder is arranged on the right side of the base.

2. The electric cylinder piston type positive displacement pump according to claim 1, characterized in that: A fan mounting seat is arranged outside the electric cylinder, and an explosion-proof axial flow fan is arranged on the fan mounting seat.

3. The electric cylinder piston type positive displacement pump according to claim 1, characterized in that: The pump chamber is provided with a one-way valve which cooperates with the material bin and the discharge pipeline.

4. The electric cylinder piston type positive displacement pump according to claim 1, characterized in that: An O-type sealing ring is arranged on the outer side of the piston.

5. The electric cylinder piston type positive displacement pump according to claim 1, characterized in that: The side wall of the silo is provided with a temperature transmitter, and the top of the silo is provided with a material level transmitter.

6. The electric cylinder piston type positive displacement pump according to claim 5, characterized in that: A pressure transmission device is arranged on the discharge pipeline.

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