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What are the characteristics of the high pressure three-piston pump?

Edit:Huaian Machinery Co., Ltd.UpDate:2018-09-17

1. Instantaneous flow is pulsating

This is because in the plunger pump, the suction and discharge processes of the liquid medium alternate, and the speed of the piston is constantly changing during the displacement process. In a pump that requires only one working chamber, the instantaneous flow rate of the pump does not change over time, and is not continuous. With the increase of the working chamber, the pulsating fluctuation of the instantaneous flow is getting smaller and smaller, and even practically, it can be thought to be a steady flow.

2. The average flow is stable

In theory, the pump flow depends only on the pump's primary structural parameters n (reciprocation times per minute), S (piston stroke), D (piston diameter), Z (number of pistons), independent of discharge pressure, and with the transport medium. Physical and chemical properties such as temperature and viscosity are irrelevant. So the pump flow is stable.

3. The pressure of the pump depends on the characteristics of the pipe

The discharge pressure of the plunger pump cannot be constrained by the pump itself, but depends on the piping characteristics of the pump equipment and is independent of the flow rate. That is to say, if it is considered that the transporting liquid is not compact, then theoretically, the discharge pressure of the reciprocating pump can be unconstrained, and any desired discharge pressure of the pump can be established depending on the piping characteristics of the pumping device. Of course, all reciprocating pumps have a pump discharge pressure rule. This is not to say that the pump discharge pressure will not rise any more. It is only because the prime mover rated power and the pump's own structural strength are not allowed. Use it beyond this discharge pressure.

4. Strong adaptability to the transport medium

Piston pumps are in principle capable of transporting any medium, independent of the physical and chemical functions of the medium. Of course, because of the information on the hydraulic end and the manufacturing process and the sealing skills, sometimes it is difficult to adapt.

5. Excellent self-priming function

The plunger pump not only has excellent suction function, but also has outstanding self-priming function. Therefore, for most reciprocating pumps, there is generally no need to pump before starting. The machine has high power and energy saving.

6. High-pressure three-piston pump flow

Theoretical flow rate of the pump: Qt=AsnZ type theoretical flow of the Qt pump; A cross section of the plunger (or piston); S stroke; n crankshaft speed (or reciprocation of the plunger per minute) Z-joint (plunger or Number of pistons) Practical flow rate of the pump: Q = Qt-Q. The flow rate of the Q pump in the formula; the theoretical flow rate of the Qt pump; the flow of the Q pump is lost.

The factors that cause the flow loss of the pump are: the volume formed by the liquid contraction or expansion is lost; because the volume formed by the hysteresis when the valve is closed is lost; because the valve is not tight after closing, the volume formed by the leakage of the sealing surface is lost; The volume formed by the leakage of the plug, piston rod or piston ring is lost.

7. Instantaneous flow of the pump

The flow rate of the three-cylinder single-acting pump is the superposition of the flow rate of the single-cylinder single-acting pump on three phases.

8. Pump power

Pump's useful power: The energy that is drawn from the pump by the pump is called the useful power per unit time.

Ne=PQ where Ne useful power, P full pressure, Q flow. After substituting the unit, the formula becomes: Ne(KW)=1/36.7×P(Kgf/cm2)×Q(m3/h). Considering the power loss caused by the power of the transmission equipment, mechanical friction, volume power, medium temperature rise, etc., when selecting the prime mover power, for the low-pressure reciprocating pump, N=1/(0.85~0.9)N; for the high-pressure reciprocating pump, N = 1 / (0.75 ~ 0.85) N.

Reciprocating pump scale

Piston pumps are mainly suitable for high-pressure and small-flow, requiring the flow of the pump to be stable or quantitative, to transport a variety of different media in a fractional manner, perhaps requiring a good suction function, perhaps requiring a self-priming function. In today's world energy shortage situation, reciprocating pumps have been widely used as energy-saving products in many industries such as energy mining, petroleum fine chemicals, food and drug processing. The structure of this type of pump is relatively complicated, with strong matching and poor versatility, and many types and small batch sizes.

High pressure reciprocating pump

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