Hydraulic manual pumps and electric pumps share similar hydraulic systems. A manual pump generates mechanical energy through human effort, while an electric pump is powered by electricity to drive hydraulic oil. So, which pump is better? In this article, TorcStark will compare and introduce them in the following aspects.

P.S.: In this article, both manual pumps and electric pumps can be combined with hydraulic wrenches, bolt tensioners, jacks, and other products.

Definition
Features
Working Principles
Applications

Now, let’s get started!

Definition

Electric Pump

An electric pump, driven by electricity, consists of a pump body, lifting pipe, pump base, submersible motor (including cables), and a starting protection device. The pump body is the operational component of the submersible pump, composed of parts such as the inlet pipe, diversion shell, check valve, pump shaft, and impeller. The impeller can be fixed on the shaft in two ways.

Manual Pump

A manual pump is a type of pump powered by human effort. A unidirectional manual oil pump is a small hydraulic pump station that converts manual mechanical energy into hydraulic energy. When used with matching cylinders and specialized tools, it can perform various operations such as lifting, bending, straightening, shearing, riveting, assembly, disassembly, and some construction and military tasks.

Features

Electric Pump

The lower part of the motor is equipped with a rubber pressure-regulating diaphragm. When the motor starts or stops, or when load changes cause pressure variations inside the motor, the internal pressure can be automatically adjusted by the rubber pressure-regulating diaphragm.

The electric pump adopts a centrifugal impeller, providing a high single-stage lift and a compact structure.

Manual Pump

Ultra-high-pressure manual hydraulic pumps serve as a simple and convenient hydraulic power source widely used in various industries such as shipbuilding, coal mining machinery, petrochemicals, metallurgy, power generation, and heavy machinery. Its advantages, including small size, light weight, easy portability, and strong safety, are widely appreciated by users.

Working Principles

Electric Pump

The impeller is installed inside the pump casing and securely fastened to the pump shaft, which is directly driven by the motor. The pump casing has a central liquid suction pipe. The liquid enters the pump through the bottom valve and suction pipe. The liquid discharge outlet on the pump casing is connected to the discharge pipe.

Before starting the pump, the pump casing is filled with the transported liquid. Once started, the impeller is driven to rotate at high speed by the shaft, causing the liquid between the blades to rotate as well. Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge, gaining energy. It then rapidly leaves the impeller’s outer edge and enters the spiral-shaped pump casing.

In the casing, the liquid slows down due to the gradual expansion of the passage, and some of its kinetic energy is converted into static pressure energy. Finally, it flows into the discharge pipe with higher pressure, reaching the desired location. As the liquid flows from the center to the outer edge of the impeller, a certain vacuum is formed at the center of the impeller. Since the pressure above the liquid level in the reservoir is greater than the pressure at the pump inlet, the liquid is continuously pushed into the impeller.

As long as the impeller keeps turning, the liquid will be continuously sucked in and discharged.

Manual Pump

The working principle of a manual hydraulic pump is based on manually transferring force to the pump body piston, compressing the fluid, and pushing it into the hydraulic system to complete hydraulic work. This type of pump is commonly used in small hydraulic systems where manual hydraulic power is required.

Currently, most manual pumps use a double-plunger design, providing high-flow output at low pressure and low-flow output at high pressure. However, when the pressure pump is in high-pressure output, the flow rate is too small, resulting in lower operational efficiency.

Applications

Electric Pump

In the production of the chemical and petroleum sectors, where raw materials, semi-finished products, and finished products are mostly liquids, complex processes require transporting liquids and providing pressure and flow for chemical reactions. Additionally, electric pumps are used to regulate temperature in many facilities.

In agricultural production, electric pumps serve as the primary drainage machinery. In vast rural areas, a significant number of pumps are required every year, with agricultural pumps typically accounting for more than half of the total pump output.

In the mining and metallurgical industries, electric pumps are also the most widely used equipment. Mines need pumps for drainage, and pumps are essential for supplying water in ore dressing, smelting, and rolling.

In the power sector, nuclear power plants require primary pumps, secondary pumps, and tertiary pumps, and thermal power plants need a considerable number of boiler feedwater pumps, condensate pumps, oil and gas mixed transportation pumps, circulating water pumps, and ash slurry pumps, among others.

In defense construction, pumps are needed for adjusting aircraft flaps, rudders, landing gear movement, naval vessels, and tank turret rotation, as well as submarine submersion and surfacing. Some applications involve high-pressure and radioactive fluids, with strict requirements for leak-free operation.

As for tools, electric pumps can serve as the power source for hydraulic wrenches, bolt tensioners, jacks, and similar products. They drive hydraulic oil to convert electrical energy into mechanical energy.

Manual Pump

The ultra-high-pressure manual hydraulic pump is an ideal power source for electromechanical assembly equipment and is currently mainly used in the following areas:

1. Power source for threaded fasteners and tightening devices.

It enables precise control of bolt pre-tension force, with the working pressure of hydraulic oil reaching up to 300 MPa. Currently, industries such as coal, power, and chemicals use high-strength hydraulic nuts or hydraulic tensioners powered by ultra-high-pressure manual hydraulic pumps, achieving excellent results.

2. Power source for the assembly and disassembly of smooth conical or cylindrical interference fits in mechanical equipment.

Hydraulic nuts are effective tools for the assembly and disassembly of smooth conical or cylindrical interference fits, such as bearings, gears, rotors, etc. Comprising a ring piston with a sealing ring and a nut with internal threads, the ultra-high-pressure manual hydraulic pump serves as the power source, introducing ultra-high pressure from the outer surface or end face of the nut, creating relative motion between the piston and the nut, facilitating the assembly and disassembly of interference fits.

3. Power source for hydraulic load-bearing oil cylinders or jacks.

An ideal tool for the installation and commissioning of heavy equipment.

Summary

Based on the content above, we can draw the following conclusions:

The fundamental difference between electric pumps and manual pumps lies in the power source – one is driven by human effort, and the other is powered by electricity.

In terms of features, electric pumps offer more precise control and higher pressure output, while manual pumps are convenient to use and boast high safety.

The working principles of electric pumps and manual pumps are generally similar but with subtle differences. Electric pumps have a more complex structure, ensuring prolonged and accurate operation. On the other hand, manual pumps have a simpler structure, making them easy to use but with lower operational efficiency.

Electric pumps have a broader range of types and applications, including powering hydraulic tools, drainage in agriculture, and supplying liquids in the chemical and petroleum sectors. Manual pumps are primarily used in small hydraulic systems, mainly for fastening and loosening bolts, providing power for hydraulic wrenches, bolt tensioners, jacks, etc.

In conclusion, we cannot definitively state whether an electric pump or a manual pump is better. The choice between them depends on specific conditions. Therefore, it is crucial to evaluate the exact situation when deciding whether to use an electric pump or a manual pump.