轮机英语教学课件(15) Marine Pumps

The application of each type of pump
Reciprocating pumps are suitable for delivering small quantities at high pressure.
Rotary pumps are used for moderate quantities at moderate pressure.
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并联工作
5
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The definition of the two main categories of the marine pumps
What are the displacement pumps?
Displacement pumps are those where the volume of the pump chamber is alternately increased to draw the liquid in from the suction pipe and then decreased to force the liquid to the delivery pipe.
for ? 4. Why are reciprocating pumps and rotary
pumps positive displacement type? 5. Are reciprocating pumps suitable for
delivering small quantities at high pressure or moderate quantities at moderate pressure?
Detailed Analysis of Difficult Sentences
The Classification of Marine Pumps
Positive Displacement Pumps
➢ ReHale Waihona Puke Baiduiprocating pumps ➢ Rotary pumps
Centrifugal Pumps
The difference between the reciprocating pump and centrifugal pump.
The application of reciprocating pumps,rotary pumps and centrifugal pumps.
In this unit, please pay attention to the usage of attributive clause.
Centrifugal pumps are more suitable for large quantities at low pressure.
船舶辅机第2章 齿轮泵 [Gear Pump]
14
配油盘
8
Review Questions
1. What are the displacement pumps? 2. What do displacement pumps consist of ? 3. What are the centrifugal pumps? 3. What are gear pumps used extensively
Under centrifugal
are_Th_e_vo_lu_te_,d_if_fu_se_r,m_i_xe_d_-fl_ow_,_ax_ia_l f_lo_w_an_d_tu_rb_in_e ___o_r _the. generative types
The Brief Diagram of the Pump
What are the centrifugal pumps?
Centrifugal pumps are those wherein an impeller rotating at high speed where the liquid is discharged through the delivery output.
3. centrifugal：adj.离心(式)的; 利用离心力的 centrifugal blower 离心式鼓风机 centrifugal force controller离心力调节器 centrifugal casting machine 离心浇铸机 n. 离心机 automatic recycling centrifugal自动程序控制离心机 centrifuge vt.用离心机分离 n. 离心机 vibrating centrifuge振动式离心机, 振动式分离机 water driven centrifuge 水动离心机
2. helical adj. 螺旋线[纹, 面, 形]的, 螺旋状的
cross helical gear 螺旋齿轮, 交错斜齿轮 helical burr 螺纹 helical conveyor 螺旋 helical spring螺旋(形)弹簧, 盘簧 helicopter直升机
Useful Vocabulary & Special Terms
Lesson 15 Marine Pumps
1. Main Contents of the Text 2. Useful Vocabulary & Special Terms 3. Detailed Analysis of Difficult Sentences 4. Review Questions 5. Some Relevant Multiple Choices Exercises
Some typical examples of pumps
Under reciprocating are_T_h_e d_ir_ec_t,_po_w_er_a_nd_c_ra_nk_-f_ly_w_h_ee_l t_yp_e_s ____ _____.
Under the rotary are __T_he_g_ea_r,_va_ne_,s_cr_ew__an_d _pi_sto_n_ty_p_es__________ _____.
Main Contents of the Text
This unit tells us the classification of marine pumps and the functionality and working principles of each type of these pumps.
Useful Vocabulary & Special Terms
1. displacement : (水, 气, 油等的)排(出) 量; (水泵, 压气机等
的)生产率; (内燃机的)气缸工作容积排水量
a ship with a displacement of 10000 tons displace vt. (使)离开位置\取代 take place of Place--displace----displacement e.g. Weeds are going to displace other plants.