KR101651359B1

KR101651359B1 - Preventing formation of scale and temperature control device

Info

Publication number: KR101651359B1
Application number: KR1020150050563A
Authority: KR
Inventors: 유기철
Original assignee: (주)청수메이드
Priority date: 2015-04-10
Filing date: 2015-04-10
Publication date: 2016-08-25

Abstract

The present invention relates to a system for removing scales and controlling a temperature of a heat exchanger, which selectively controls the heat exchange of a heat exchanger in the winter or in the summer by installing an electric ball valve for controlling the flow of cooling water, and effectively removes scales from the heat exchanger or prevents the scales from sticking to the heat exchanger by reducing back pressure applied to the heat exchanger and a recovery pipe to maximize the operation of an air injection device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a scale and temperature control system for a heat exchanger,

The present invention relates to a scale removing system and a temperature control system for a heat exchanger, and more particularly, to a system and method for controlling scaling and temperature control of a heat exchanger by controlling the flow of cooling water, And more particularly to a scale removal and temperature control system for a heat exchanger.

Generally, the water used is mainly divided into sewage water, industrial (industrial) water, ground water, and the like. On the other hand, mineral and gaseous elements such as various metal elements and minerals are dissolved in the water for use (hereinafter referred to as 'cooling water'), and if these substances are not appropriately treated, the above- Is a source for generating various bacteria and microorganisms by generating rust and scale in piping and water tanks (including dipping resin).

Particularly, in case of using a heat exchanger, a temperature controller and a raw material feeder (hereinafter referred to as "peripheral equipment") of an injection machine for a long time, the cooling water moves to generate rust and scale inside the pipes and peripheral devices, There is a problem that its own functions such as peripheral devices are lost or the efficiency is remarkably reduced.

The "device for removing foreign substances such as rust and scale in a pipe" which is originally filed by the applicant is installed in piping or peripheral equipment for supplying and circulating water to the peripheral devices and simultaneously discharging water and compressed air, It has the effect of eliminating or suppressing the generation.

In addition, the air injection device installed in the mold, which is installed in the mold, is provided with an air injection device in the mold, and the compressed air moves along with the water to the cooling hole side to generate vortices and turbulence, It has an effect of effectively removing scale and foreign matter.

As described above, the above-mentioned conventional patents have a structure in which water and compressed air are injected into a mold, a heat exchanger, a peripheral device and circulated while effectively removing scale components and foreign substances formed on the entrance side of a mold, a peripheral device, And peripheral devices have a problem in that the supply pressure of water and compressed air becomes weak and scale components and foreign substances can not be sufficiently removed. Particularly, when a line through which water such as a mold and a peripheral device is circulated is long, clogging of a mold, a heat exchanger, a peripheral device and the like is rapidly progressed.

Patent Registration No. 10-0138406 Patent Registration No. 10-0979550 Patent Publication No. 10-2011-15291

In order to solve the above problems, an electric ball valve for regulating the flow of cooling water is installed to selectively control the heat exchange of the heat exchanger in the winter season and the summer season, and to reduce the back pressure applied to the heat exchanger and the return pipe, The present invention provides a scale removal and temperature control system for a heat exchanger that maximizes the operation of the heat exchanger and effectively prevents scale removal or stenosis in the heat exchanger.

In accordance with the present invention, there is provided a system for removing scale and temperature of a heat exchanger comprising a water tank, a heat exchanger, a supply pipe and a return pipe installed between the water tank and the heat exchanger, Way valve for switching the direction of the compressed air, an electric ball valve installed in the return pipe for controlling the flow rate of the cooling water, and a compressed air valve installed in the supply pipe on the rear side of the four- A control unit for controlling the operation of the four-way valve to guide the cooling water and the compressed air supplied from the heat exchanger in the forward and reverse directions, and a first communicating pipe provided in the supply pipe and the return pipe, A three-way valve installed in the first communicating pipe and the supply pipe, a cooling water suction induction part provided in the first communicating pipe, a cooling water suction inducing part, And a second communicating tube formed in the heat exchanger.

Therefore, the scale removal and temperature control system of the heat exchanger of the present invention controls the flow rate of the cooling water according to the temperature change of the cooling water such as diagonal and seasons by the electric ball valve to realize the temperature of the operating oil heat exchanged in the heat exchanger more stably And the back pressure applied to the heat exchanger, the water supply pipe and the return pipe is reduced to maximize the operation of the air injection device, thereby effectively preventing scale removal or stenosis in the heat exchanger.

1 and 2 are schematic views showing an operating state of a scale removal system and a temperature control system of a heat exchanger according to the present invention,
FIG. 3 is a cross-sectional view showing an air injection device of a scale removal and temperature control system of a heat exchanger according to the present invention,
4 is a cross-sectional view showing a cooling water discharging device in a heat exchanger of a scale removal and temperature control system of a heat exchanger according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 to 4, the scale removal and temperature control system of the present invention is provided with a water tank 10, a heat exchanger 20, and a heat exchanger 20 installed between the water tank 10 and the heat exchanger 20 A four-way valve 50 provided on the side of the supply pipe 30 and the return pipe 40 for switching the direction of the cooling water and the compressed air, and a return pipe 40 Way valve 50 is provided on the side of the supply pipe 30 and the compressed air is forcedly injected toward the heat exchanger 20 side, A controller 80 for controlling the operation of the four-way valve 50 to guide the cooling water and the compressed air supplied from the heat exchanger 20 in the forward and reverse directions, And a cooling water discharging device (90) provided in the heat collecting pipe (40).

A pump 11 is installed on the discharge side of the water tub 10 and a valve is provided on the front side of the pump 11. A check valve 12 is provided on the rear side of the air injection device 70, .

The check valve 12 prevents the compressed air injected through the air injecting device 70 from flowing backward.

The four-way valve 50 is not specifically described with a typical structure, and the directions of the cooling water and the compressed air are switched through two corresponding conduits according to the rotation of 0 ° to 90 °.

The electric ball valve 60 can be controlled by the control unit 80 in a proportional manner.

In this way, the flow rate of the cooling water is controlled by the electric ball valve 60 according to the temperature change of the cooling water such as diagonal and seasonal changes, thereby maintaining the operating fluid of the injection molding machine, which is heat-exchanged in the heat exchanger 20, It is possible to improve the reproducibility of the operating fluid during operation, thereby improving the performance of an injection molding machine, an extruder, a die casting machine, and other hydraulic devices.

The air injection device 70 is forcibly injected compressed air toward the supply pipe 30. The air injection device 70 is installed in the supply pipe 30 and includes an inlet port 72, an outlet port 73, and an air inlet port 74 A backflow preventing valve 75 provided on the side of the air inflow hole 74 for preventing the back flow of water toward the air inflow hole 74 and an inlet port 72 and an outlet port 73 And an air injecting part 76 for injecting the air introduced into the air inflow hole 74 in an oblique direction.

The air injection device 70 is installed on the side of the supply pipe 30 to forcibly inject compressed air into the heat exchanger 20 to remove foreign substances and suppress scale generation. And has a residual-water removing function.

Way valve 50 is provided in front of the air injector 70 and the compressed air can be directed to the supply pipe 30 and the return pipe 40 side by the four- will be.

The supply pipe (30) is provided with a first temperature sensor (13) for sensing the temperature of the cooling water supplied to the heat exchanger (20).

A first temperature sensor 13 and a pressure gauge 42 for sensing the temperature of the cooling water recovered to the heat exchanger 20 are installed in the recovery pipe 40.

The first and second temperature sensors 13 and 41 and the pressure gauge 42 sense the temperature variation and pressure of the cooling water circulated along the heat exchanger 20 and recognize the scale generation state in the controller 80 will be.

The cooling water discharging device 90 in the heat exchanger includes a first communicating pipe 91 provided between the supply pipe 30 and the return pipe 40 and a second communicating pipe 91 provided between the first communicating pipe 91 and the supply pipe 30, A cooling water suction induction part 93 provided in the first communicating tube 91 and a second communicating tube 94 formed in the cooling water suction inducing part 93 and the return pipe 40. [

The three-way valve 92 switches the direction of the cooling water supplied to the supply pipe 30 to guide the supply of the cooling water to the first communication pipe 91 and cut off the supply of the cooling water to the first communication pipe 91.

The cooling water suction induction unit 93 includes a body 96 having a space 95 formed therein and an inlet hole 97 and a discharge hole 98 communicating with the space 95, And a nozzle 99 for spraying cooling water to the discharge hole 98 side.

The nozzle 99 has a portion to which cooling water flows, and a portion to which the cooling water is sprayed is tapered inward and narrowly formed. The cooling water injected through the nozzle 99 passes through the end portion of the nozzle 99 and flows into the space portion 95 and flows into the inflow hole 97 side, The cooling water is forcibly sucked and discharged to the discharge hole 98 side.

The aerator 14 is installed in the supply pipe 30 and the aerator 14 is installed on the front side of the three-way valve 92 and is connected to the supply pipe 30 according to the operation of the three- And selectively controls the inflow / outflow of air to the side.

A filter or a strainer may be provided between the three-way valve 92 and the aerator 14, as shown in FIG.

On the other hand, in order for the cooling water to move to the cooling tower 100 side through the return pipe 40, a certain back pressure is generated. Since a constant back pressure is generated on the side of the return pipe 40 as described above, it is difficult to obtain a sufficient effect by the operation of the air injecting device 70, and a connection pipe 43 is provided between the return pipe 40 and the water tank 10 ) Is installed.

The water tank 10 is formed lower than the return pipe 40 so that the cooling water remaining in the return pipe 40 is discharged to the connection pipe 43, So that it can be applied only to the structure which is moved to the water tub 10 side naturally.

As described above, according to the present invention, the operation and effect of the scale removal and temperature control system of the heat exchanger will be described. When the pump 11 is driven, the cooling water flows through the air injection device 70, (50) to the supply pipe (30), circulated in the heat exchange, and is passed along the recovery pipe (40) through the four-way valve (50) And circulated in the water tub 10 again. In this process, the flow rate of the cooling water passing through the heat exchanger (20) is controlled by the electric ball valve (60) in accordance with the temperature change of the cooling water, Is more stable.

In order to prevent scaling or stagnation in the heat exchanger 20, the three-way valve (not shown) of the cooling water discharging device 90 in the heat exchanger during the process of being supplied to the supply pipe 30 by the pump 11 When the direction of the cooling water is switched to the first communicating tube 91 side by the first communicating tube 92 and the second communicating tube 91 by the second communicating tube 92, the incoming cooling water quickly passes through the nozzle, and the cooling water remaining in the return tube 40 and the heat exchanger 20, The water is sucked toward the inflow hole 97 through the communicating tube 94 and is moved toward the water tub 10 through the first communicating tube 91 and toward the return pipe 40. At this time, the electric ball valve 60 is opened and the three-way valve 92 blocks the movement of the cooling water to the heat exchanger 20 side.

When the part of the cooling water remaining in the recovery pipe 40 and the heat exchanger 20 is discharged, the back pressure generated in the recovery pipe 40 and the heat exchanger 20 is reduced.

Subsequently, when the compressed air and the cooling water are injected in the forward and reverse directions by the operation of the air injection device 70 while the back pressure in the heat exchanger 20 and the return pipe 40 is suppressed, the heat exchanger 20, It is possible to maximize the prevention of scaling or prevention of stenosis.

In other words, since the cooling water is partially discharged into the heat exchanger 20 and the return pipe 40, the resistance value of the compressed air and the cooling water passing through the heat exchanger 20 is reduced, The remaining cooling water and compressed air collide with each other to maximize the generation of shock waves, thereby minimizing the scale removal and the stagnation in the heat exchanger 20.

It is preferable that the cooling water discharging device 90 is firstly operated before the air injecting device 70 is operated and then the compressed air is injected into the heat exchanger 20 in the forward and reverse directions.

30: supply pipe 40: return pipe
50: Oil tank 60: Electric ball valve
70: air injection device 80:

Claims

A water tank (10);
A heat exchanger (20);
A supply pipe 30 and a return pipe 40 installed between the water tank 10 and the heat exchanger 20;
A four-way valve (50) installed on the side of the supply pipe (30) and the return pipe (40) for switching the directions of the cooling water and the compressed air;
An electric ball valve (60) installed in the return pipe (40) for controlling the flow rate of the cooling water;
An air injector 70 installed on the side of the supply pipe 30 at the rear of the four-way valve 50 for forcibly injecting the compressed air toward the heat exchanger 20;
A controller 80 for controlling the operation of the four-way valve 50 to guide the cooling water and the compressed air supplied from the heat exchanger 20 in the forward and reverse directions;
A first communicating tube 91 provided in the supply pipe 30 and the return pipe 40, a three-way valve 92 provided in the first communicating pipe 91 and the supply pipe 30, A body 96 having a space 95 provided in the space 95 and an inlet hole 97 and an outlet hole 98 communicating with the space 95; A cooling water suction induction portion 93 composed of a nozzle 99 for spraying cooling water to the discharge hole 98 side and a second communication pipe 94 formed in the cooling water suction induction portion 93 and the recovery pipe 40 A cooling water discharging device (90);
And a connection pipe (43) provided between the recovery pipe (40) and the water tank (10) so that the water tank (10) is lower than the recovery pipe (40).

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