CN103292382A - Device and method for removing air of water heating system - Google Patents

Abstract

A water heating system air removal device and method with the function of removing air, comprising a water inlet pipe and an emptying device connected thereto, the emptying device is connected to the water outlet pipe through a valve, and in the emptying device, the free floating ball and the water outlet pipe Connected by valves, the pressure valve is below the emptying device, the baffle is a fan-shaped structure on the upper part of the free floating ball, the emptying valve is installed on the top of the emptying device, and the air extractor is connected to the emptying valve through a pipeline . The innovation of the present invention is that an air eliminator is installed between the water inlet pipeline and the water outlet pipeline. Inside the air eliminator is a region with a low flow rate, which can remove air bubbles, including microbubbles, etc., mixed in the water. Release the air in the water, separate the water from the air, and finally remove the air; in addition, reduce the internal pressure of the device through the air extractor to volatilize the air dissolved in the water, further ensuring the quality of the water in the outlet pipe.

Description

A plumbing system air removal device and method

technical field

The invention relates to an air removal device for a water heating system, in particular to an air removal device and method for a water heating system with the functions of separating water and air and removing the air. the

Background technique

In the north, the plumbing system is an essential heating facility for every household. But the prerequisite for a plumbing system to operate safely and efficiently is the absence of air throughout the system. When there is air in the system, it will cause the following hazards to the system: chemical oxidation of metal parts and air in the system; heat load loss at the end of heat dissipation or the entire system; loss of water pump head and heat transfer loss of heat carrier. At present, in the water heating system, the air exists mainly in three ways: static air pockets, air bubbles and air dissolved in water. The main exhaust devices in the water heating system are divided into high-position exhaust valves and centralized air separation devices, but the former needs to be manually operated sometimes and is not flexible enough, and the latter cannot provide a low enough flow rate to make air bubbles including microbubbles effective. isolation and exclusion. the

Contents of the invention

The purpose of the present invention is to invent a water heating system air removal device, to provide a method for effectively removing air in the water heating system, which will affect the corrosion rate of metal parts, heat load loss, water pump head loss and heat transfer loss of heat carrier factors. Excluded, thereby improving the service life and heat transfer efficiency of metal materials, and ensuring the quiet and comfortable operation of the water heating system. the

In order to achieve the above object, the device of the present invention mainly includes: a water inlet pipe, a free floating ball, a pressure valve, a baffle plate, an emptying valve, an air extractor and a water outlet pipe. the

The water inlet pipe of the emptying device is connected with the water heating system, and the water in the water heating system enters into the emptying device through the water inlet pipe. the

There is a free floating ball inside the emptying device, and the free floating ball is connected with the outlet pipe through a valve. The free float is a finely ground stainless steel hollow float. Its characteristics are: the outer diameter of the free float is slightly smaller than the inner diameter of the emptying device cavity, and the float can float up and down freely without friction damage to the valve. When water enters, the difference between the buoyancy and gravity of the floating ball is used to make the floating ball float upwards, and the water in the emptying device is discharged from the outlet pipe through the valve. the

When the water enters the interior of the emptying device from the water inlet pipe, since the diameter of the water inlet pipe is much smaller than the inner diameter of the inner cavity of the emptying device, it can be known from the principle of fluid mechanics: since the fluid can neither be interrupted nor accumulated when flowing in the pipe, Therefore, the mass of water flowing through any section of the pipe in unit time is equal, that is, the following continuity (mass conservation) equation holds:

ρ ₁ S ₁ V ₁ = ρ ₂ S ₂ V ₂ = constant In the formula: ρ—density; S—pipe cross-sectional area; V—flow velocity

From this, it can be concluded that the flow velocity at the thicker pipe diameter is smaller, while the flow velocity at the thinner pipe diameter is higher, that is to say, the airflow velocity is inversely proportional to the large cross-sectional area of the pipe. Therefore, when water enters the evacuation device from the water inlet pipe, the flow rate of the water is reduced, forming a region of lower flow rate inside the evacuation device. Air bubbles, including microbubbles, trapped in the water in this area have enough time to rise to form larger bubbles and eventually burst, releasing the trapped air, which collects due to the difference between water and air on top of the unit.

An emptying valve and an air extractor are installed on the top of the emptying device, and the air released by the air bubbles and mixed in the water gathered at the top of the emptying device is drawn out by the air extractor through the emptying valve. During operation of the air extractor, the pressure inside the evacuator is low. According to Henry's law: at a certain temperature, the concentration of a certain gas in the solution is proportional to the equilibrium pressure of the gas on the liquid surface. And this law is also useful for volatile solutes in dilute solutions. Experiments show that this law is correct only when the solubility of gas in liquid is not very high. Generally speaking, nitrogen and oxygen, the main components in the air, have very little solubility in water, and the formed solution belongs to the range of dilute solution. Therefore, the air dissolved in the water of the plumbing system is released due to the low pressure inside the unit, collects inside the emptying unit and is drawn out by the air extractor through the emptying valve. the

The water that enters the interior of the emptying device from the water inlet pipe, due to the difference in density, the air released from the water gathers at the top of the emptying device and is extracted by the air extractor, while the water flows into the bottom of the emptying device. When the water gradually increases, use The difference in density between the water and the free floating ball makes the free floating ball float upwards, the valve opens automatically, and the water is discharged through the outlet pipe; when the water is exhausted, the free floating ball automatically sits on the bottom valve without friction, and the valve automatically closes. The bottom valve inside the emptying device is always in a water-sealed state, so it plays a role of isolating air. the

When too much water from the plumbing system causes the free float to rise too fast, the baffle and pressure valve come into play. There is too much water accumulation at the bottom of the emptying device, and the free floating ball floats upwards. When the water accumulates to a certain extent, the free floating ball touches the baffle directly above it. The pressure valve at the bottom is automatically opened, and the water is discharged through the pressure valve. At this time, the water level drops, and the free floating ball falls with the water level. When the free floating ball falls to the normal water level range, the pressure drops, and the pressure valve automatically closes, emptying The unit is operating normally and the water is drained through the outlet pipe. the

The method of the present invention is: install an air removal device in the water heating system, and use the density difference between air and water to remove the air accumulated on the top of the emptying device through the air exhaust valve through the air extractor, so as to ensure the quietness and comfort of the water heating system run. the

In the present invention, an air removal device is installed on the pipeline between the water inlet pipe and the water outlet pipe, and the air in the water transported by the water inlet pipe is removed through the air removal device, so that the water flowing into the water outlet pipe does not dissolve air and reduces the material of metal parts Corrosion rate, heat load loss, pump head loss and heat carrier heat transfer loss. the

the

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention. the

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings. the

Referring to Fig. 1, the water inlet pipe 1 is connected with the inlet of the emptying device 9, and the emptying device 9 is connected with the water outlet pipe 5 through the valve 4, and in the emptying device 9, the free floating ball 2 is connected with the water outlet pipe 5 through the valve 4, The pressure valve 3 is below the emptying device 9, the baffle 7 is an arc structure on the upper part of the free floating ball 2, the emptying valve 6 is installed on the top of the emptying device 9, the air extractor 8 passes through the pipeline and the emptying valve 6 phase connection. the

After the water in the water inlet pipe 1 is input into the emptying device 9, due to the density difference between water and air, the water gathers in the lower part of the emptying device 9, while the air gathers in the upper part. When water enters the inlet of the emptying device 9 , the flow velocity of the water decreases due to the sudden increase of the diameter of the pipe, thus forming an area with a low flow velocity inside the emptying device 9 . In this area, the air bubbles including microbubbles etc. included in the water have enough time to rise to form larger bubbles and finally burst, and the air is released and collected on the top of the emptying device 9 . In addition, according to Henry's law: at a certain temperature, the vapor partial pressure of a solute in a dilute solution is proportional to the solution concentration. Therefore, the air in the emptying device 9 is constantly extracted by the air extractor 8, and the air dissolved in the water will also volatilize and be extracted by the air extractor 8 through the emptying valve 6, thereby reducing the air content in the water. the

Inside the emptying device, the diameter of the free floating ball is slightly smaller than that of the cavity of the emptying device, and it can float up and down freely. After the water enters the bottom of the emptying device 9, due to the density difference between the water and the free floating ball, the free floating ball will rise with the increase of water, the liquid level will rise, the free floating ball 2 will float upward, the valve 4 will be opened, and the water will pass through the valve 4 through Discharge in the outlet pipe 5, when the water is discharged, the free floating ball 2 automatically sits on the valve mouth of the valve 4, and the valve 4 automatically closes, and when the water enters the bottom again, the free floating ball 2 starts to circulate again. Since the valve 4 is in the water seal all the time, there will be no air entering in the outlet pipe, which plays the role of air isolation. the

When the flow rate in 1 of the inlet pipe is too large, the water level rises, and the free floating ball rises upwards. When it reaches a certain height, the back baffle 7 will stop the free floating ball, and the internal pressure of the emptying device will rise. After reaching a certain pressure, the pressure valve will 3 is automatically opened, the water is discharged by the pressure valve 3, the flow of water in the water inlet pipe 1 is adjusted to restore the water level and pressure to the normal range, the pressure valve 3 is closed, and the emptying device 9 operates normally. the

Claims (2)

1. A device with the function of separating and removing water and air in the water heating system, comprising a water inlet pipe 1 and an emptying device 9 connected thereto, and the emptying device 9 is connected with the water outlet pipe 5 through a valve 4. In the emptying device 9, the free floating ball 2 is connected with the outlet pipe 5 through the valve 4, the pressure valve 3 is below the emptying device 9, the baffle 7 is an arc-shaped structure above the free floating ball 2, and the emptying valve 6 is installed on the top of the emptying device 9, and the air extractor 8 is connected with the emptying valve 6 through a pipeline. 2. A method for separating and removing water and air in a water heating system, characterized in that: an air removal device is installed in the water heating system, and the inside of the emptying device is a region with a low flow rate, and the inclusions in the water include Air bubbles such as microbubbles have enough time to rise to form larger bubbles and finally burst to release air. Due to the density difference between water and air, the air gathers at the top of the device. At the same time, according to Henry's law, the air dissolved in water and the air above The partial pressure is directly proportional. When the internal pressure of the device is low, the air dissolved in the water is precipitated, and the air accumulated at the top of the device is removed by the air extractor, and after the water flows into the bottom of the device, the density difference between the water and the free floating ball is used to , when the water level rises when the water increases, the free float floats upwards, and the water is discharged through the outlet pipe through the valve.

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