TWI570023B - Ship central fresh water cooling system - Google Patents

Description

Ship central freshwater cooling system

The present invention relates to a cooling system, and more particularly to a marine central fresh water cooling system.

According to the ship, the fresh water side cooling system is one of the central cooling systems. Its function is to generate heat generated by the ship's auxiliary equipment (such as the cooling machine used for the machine, the cooling machine for the generator, etc.). The hot liquid is taken away by the cooling liquid, and then exchanged with the heat exchange part of the seawater side cooling system of the ship, or exchanged with the water cooling system of the ship's main engine casing to reduce the temperature of the ship main engine and other auxiliary equipment. purpose.

In order to achieve the above-mentioned operation of the fresh water side cooling system of the ship, a three-way valve is mainly used to cooperate with a pump with full flow output, and the control of the three-way valve mainly detects the three-way through a temperature sensor. The outlet temperature of the valve, when the outlet temperature exceeds the set value, the outlet valve of the three-way valve is controlled to increase the opening degree, and the bypass valve of the three-way valve is reduced in opening degree, thereby increasing the cooling liquid flow rate. Conversely, the opening of the outlet valve is reduced, and at the same time the opening of the bypass valve is increased, thereby increasing the backflow to avoid the temperature of the cooling liquid being too low.

Since the ship or the ship's auxiliary equipment must maintain a certain warm-up or waiting temperature, whether it is in the running state or the shutdown state, to avoid low temperature corrosion, or other problems due to different expansion coefficients. However, the general shipyard or In order to avoid troubles or long-term operation habits of the freshwater side cooling system of the ship, the ship's freshwater side cooling system is provided by the ship when the ship's navigation mode is navigation, inbound and outbound, and porting. The maximum rated flow of the cooling liquid is to avoid this.

However, when the ship is in various driving states, the ship's main engine and the ship's accessory equipment do not require such a large amount of cooling liquid flow, especially when the ship is parked at the port, the cooling provided by the ship's fresh water side cooling system. The maximum rated flow of liquid will far exceed the amount required by the main engine of the ship and the equipment attached to the ship, resulting in the loss of unnecessary energy. Accordingly, the creators of the present invention believe that this is necessary for improvement.

In view of the deficiencies described in the prior art, the creator of the present invention proposes a solution to a ship central fresh water cooling system comprising:

A frequency conversion pump:

The inverter pump outlet section is connected to one end of a water outlet pipe, and the inlet section is connected to one end of a return water pipe, and the other end of the water outlet pipe is connected to the other end of the water return pipe.

A bypass:

The bypass pipe is disposed at one of the outlet pipes, and the outlet pipe is sequentially defined from one end toward the other end by a first to third section, and the second section is available for a ship seawater side cooling system The heat exchange unit performs heat exchange.

A group of objects to be cooled:

The inlet section of the group to be cooled is in communication with the outlet pipe, the outlet section and the return pipe The same.

A differential pressure detection unit:

The differential pressure detecting unit is configured to detect a pressure difference between the inlet section and the outlet section of the group to be cooled, and obtain a differential pressure detection value.

A rate detection unit:

The rate detecting unit can detect the moving speed of the ship in one unit time and obtain a rate detecting value.

A control unit:

The control unit is electrically connected to the differential pressure detecting unit and the frequency conversion pump, and the control unit writes a pump control program, wherein the pump control program is executable by the control unit: when two consecutive unit time rate detection values are performed When the difference between the values exceeds a preset value, the inverter is controlled to operate at a maximum operating rate; otherwise, the operating rate of the inverter is controlled until the differential detection value is equal to a differential pressure default value.

Through the above structure, the frequency conversion pump of the fresh water side cooling system of the ship can adjust the output flow of the cooling liquid according to the current state of the ship, without having to maintain the maximum cooling liquid output flow for a long time, thereby achieving energy saving. The purpose of use is to address the deficiencies described in the prior art.

(A) ‧‧‧ship freshwater side cooling system

(B) ‧‧‧Ship sea side cooling system

(B1)‧‧‧Hot Exchange Department

(1)‧‧‧Frequency pump

(2) ‧ ‧ water outlet

(21) ‧‧‧First Section

(22)‧‧‧The second paragraph

(23) ‧‧ Section III

(3) ‧‧‧ return pipe

(4) ‧ ‧ bypass pipe

(5) ‧‧‧ three-way valve

(6) ‧‧‧Warming group

(61)‧‧‧Over-the-machine cooler

(62)‧‧‧Air compressor cooler

(63)‧‧‧Drive shaft cooler

(64)‧‧‧Air conditioner cooler

(65) ‧‧‧Ship liner water cooling system

(7)‧‧‧ Differential Pressure Detection Unit

(8)‧‧‧ Rate detection unit

(9) ‧‧‧Control unit

(91)‧‧‧ Input unit

(92)‧‧‧Flow detection unit

(0)‧‧‧Temperature Detector

The first figure is a schematic diagram of the connection of each component of the invention.

The second figure is a schematic diagram of the connection between the control unit and each component of the invention.

The construction, features and embodiments of the present invention will be described with the aid of the drawings, and the reviewers will have a better understanding of the present invention.

Referring to the first figure, the invention relates to a ship central fresh water cooling system, comprising:

A frequency conversion pump (1):

Referring to the first figure, as shown in the second figure, the frequency conversion pump (1) includes an outlet section and an inlet section, and the outlet section of the inverter pump (1) is connected to one end of the outlet pipe (2), and The inlet section of the inverter pump (1) is connected to one end of a return pipe (3), and the other end of the outlet pipe (2) is in communication with the other end of the return pipe (3). Wherein, the outlet pipe (2) spans a bypass pipe (4), and the bypass pipe (4) defines the first to third sections (21, 22, 23) of the outlet pipe (2), and The second section (22) is for heat exchange with a heat exchange section (B1) of a marine water side cooling system (B). In addition, the outlet pipe (2) is preferably provided with a three-way valve (5), and the bypass port of the three-way valve (5) is connected to one end of the bypass pipe (4) to adjust the cooling liquid flow. The flow rate through the second section (22) and the bypass pipe (4).

A group of cooling objects (6):

Referring to the first figure, as shown in the second figure, the inlet section of the object to be cooled (6) is in communication with the outlet pipe (2), and the outlet section is in communication with the return pipe (3). For example, the object to be cooled (6) includes a plurality of objects to be cooled, and the arrangement position thereof is preferably as shown in the figure, and each of the objects to be cooled is preferably a left-to-right machine cooler (61), one from left to right. A first generator cooler (62), a second generator cooler (63), a drive shaft cooler (64), and a marine liner water system (65). Wherein, the freshwater side cooling system (A) of the ship is connected to the ship's cylinder water system (65) by a heat exchange unit. Heat exchange is carried out to achieve the purpose of cooling the tank water system (65) of the ship.

A differential pressure detecting unit (7):

Referring to the first figure, as shown in the second figure, the differential pressure detecting unit (7) is configured to detect a pressure difference between an inlet section and an outlet section of the group to be cooled (6), thereby obtaining a differential pressure detection. Measured value. Preferably, the differential pressure detecting unit (7) detects the plurality of objects to be cooled, and is farthest from the frequency conversion pump (1). For example, the differential pressure detecting unit (7) is compared. The system detects the pressure difference between the inlet and outlet sections of the vessel's water jacketing system (65).

A rate detecting unit (8):

Referring to the first figure and the second figure, the rate detecting unit (8) mainly detects the moving speed of the ship in one unit time, and obtains a rate detecting value. In addition, the rate detecting unit (8) mainly detects the moving speed of the ship continuously, and obtains a complex rate detecting value.

A control unit (9):

Referring to the first figure and the second figure, the control unit (9) is electrically connected to the differential pressure detecting unit (7), the frequency conversion pump (1), the rate detecting unit (8), and The three-way valve (5), and the control unit (9) writes a pump control program.

Since the moving speed of the ship changes significantly when entering and leaving the port, the creator of the present invention believes that it can be judged whether the speed difference of the ship exceeds a predetermined value by using two consecutive unit time. At rest, or in a state of navigation, or in an inbound and outbound state. In addition, the ship's moving speed changes greatly when the ship enters and exits, so that each cooling object needs to pass the maximum flow of cooling liquid. It can cope with the instantaneous increase of the temperature of each object to be cooled, and when the ship is in a stationary state or in the navigation state, it is because the ship speed change is in a stable state, so each of the objects to be cooled does not need to supply the maximum flow of the cooling liquid, so that it can be more suitable. Working environment.

Therefore, the pump control program is executable by the control unit (9): when the difference between the rate detection values of two consecutive unit time exceeds a rate preset value, the frequency conversion pump is controlled (1) The operation is performed at the maximum operating rate; otherwise, the operating rate of the inverter pump (1) is controlled until the differential pressure detection value is equal to a preset value of the differential pressure.

Accordingly, the freshwater side cooling system (A) of the ship created by the present invention allows the variable frequency pump (1) to control the flow rate of the output cooling liquid according to the state of the ship, rather than the state of the maximum cooling liquid output flow for a long period of time. Thus, a large amount of energy is saved to solve the deficiencies described in the prior art.

Next, the ship fresh water side cooling system (A) created by the present invention can further be implemented as:

A temperature detector (0):

Referring to the first figure and the second figure, the temperature detector (0) is disposed in the third section (23), and is located in the three-way valve (5) and the object to be cooled (6) The temperature detector (0) is configured to detect the temperature of the cooling liquid passing through the three-way valve (5) to obtain a temperature detection value, and the temperature detector (0) is electrically connected. The control unit (9).

The control unit (9) further writes a three-way valve control program, and the three-way valve control program is executable by the control unit (9): when the temperature detection value is lower than a temperature preset value, then control The valve opening of the three-way valve (5) is up to the temperature The detected value is the same as the preset value of the temperature. Thereby, the temperature of the cooling liquid passing through the three-way valve (5) is prevented from being too low, thereby affecting the overall cooling efficiency.

Furthermore, in order to make the setting of the preset value of the differential pressure more correct, and to improve the overall energy saving effect of the creation of the present invention, the creation of the present invention can further be implemented as:

Further, an input unit is electrically connected to the control unit (9), and the input unit (91) is configured to input a flow coefficient value (C _V ) of a group to be cooled, and a cooling liquid density value ( ρ ). A flow detector (92) is disposed at an exit section of the frequency conversion pump (1) for detecting a flow rate value (Q) of the output cooling liquid of the frequency conversion pump (1); the control unit (9) writes There is a differential pressure preset value estimation program, and the differential pressure preset value estimating program is executable by the control unit (9): according to the flow coefficient value (C _V ), the cooling liquid density value ( ρ ), the flow value ( Q), and , the preset value of the differential pressure is estimated.

In addition, the invention can be combined with the method of controlling the pressure difference of the tube head of the cooling system or the method of controlling the pressure difference at the end of the tube, so that the differential pressure detecting unit (7) detects the proximity of the frequency conversion pump (1). The pressure difference of the object to be cooled (as shown in the feeder cooler), or the pressure of the object to be cooled (such as the ship's main cylinder liner water cooling system shown in the figure) Poorly, as a control group for satisfying the preset value of the pressure difference, the ship fresh water side cooling system (A) created by the invention has the advantage that the head pressure difference control is easy to repair, or has the end of the tube The advantages of energy saving by differential pressure control.

In summary, the creation of the present invention is indeed in line with the industrial applicability, and is not found in the publication or public use before the application, nor is it known to the public, and has non-obvious knowledge. In accordance with the patentable requirements, 提出 file a patent application according to law.

However, the above-mentioned statements are a preferred embodiment of the invention in the creation of the invention, and all the changes in the scope of the patent application according to the invention are within the scope of the claim.

(A) ‧‧‧ship freshwater side cooling system

(B) ‧‧‧Ship sea side cooling system

(B1)‧‧‧Hot Exchange Department

(1)‧‧‧Frequency pump

(2) ‧ ‧ water outlet

(21) ‧‧‧First Section

(22)‧‧‧The second paragraph

(23) ‧‧ Section III

(3) ‧‧‧ return pipe

(4) ‧ ‧ bypass pipe

(5) ‧‧‧ three-way valve

(6) ‧‧‧Warming group

(61)‧‧‧Over-the-machine cooler

(62)‧‧‧Air compressor cooler

(63)‧‧‧Drive shaft cooler

(64)‧‧‧Air conditioner cooler

(65) ‧‧‧Ship liner water cooling system

(7)‧‧‧ Differential Pressure Detection Unit

(0)‧‧‧Temperature Detector

Claims (2)

A ship central fresh water cooling system comprises: a frequency conversion pump: an outlet section is connected to one end of a water outlet pipe, the inlet section is connected to one end of a return water pipe, and the other end of the outlet pipe is connected to the other end of the return pipe; a bypass pipe Between the one portion of the outlet pipe, the outlet pipe sequentially defines a first to third section from one end toward the other end, and the second section is available for heat exchange with a seawater side cooling system of the ship a heat exchange unit; a cooling object group: the inlet section of the object to be cooled is in communication with the outlet pipe, and the outlet section is in communication with the return pipe; a differential pressure detecting unit: for detecting the object to be cooled a differential pressure between the inlet section and the outlet section to obtain a differential pressure detection value; a rate detection unit: for detecting the movement rate of the vessel in one unit time, and obtaining a rate detection value; a control unit Electrically connecting the differential pressure detecting unit, the rate detecting unit, and the frequency conversion pump, the control unit writes a pump control program, and the pump control program is executable by the control unit: when two consecutive unit time Rate detection value When the difference between the values exceeds a preset rate, the inverter is controlled to operate at a maximum operating rate; otherwise, the operating rate of the inverter is controlled until the differential value is equal to a differential a value is set, wherein a three-way valve is disposed in a section of the outlet pipe, the bypass port of the three-way valve is connected to the bypass pipe; and the third segment is located in the third-way valve and the group of the object to be cooled a temperature detector is provided for detecting the temperature of the cooling liquid passing through the three-way valve to obtain a temperature detection value; the control unit is electrically connected to the three-way valve And the control unit writes a three-way valve control program, and the three-way valve control program is executable by the control unit: when the temperature detection value is lower than a preset temperature value, the three-way valve is controlled The opening opening size is until the temperature detection value is the same as the temperature preset value. For example, the patent application model is the central fresh water cooling system of the ship, wherein an input unit is electrically connected to the control unit, and the input unit is configured to input a flow coefficient value (C _V ) of a group to be cooled, and a cooling liquid density value ( ρ ); a flow detector is disposed at an exit section of the frequency conversion pump for detecting a flow rate value (Q) of the output cooling liquid of the frequency conversion pump; the control unit writes a pressure difference a preset value estimation program, wherein the differential pressure preset value estimating program is executable by the control unit: according to the flow coefficient value (C _V ), the cooling liquid density value ( ρ ), the flow rate value (Q), and , the preset value of the differential pressure is estimated.