WO2014182053A1

WO2014182053A1 - Apparatus for measuring differential pressure in air blower

Info

Publication number: WO2014182053A1
Application number: PCT/KR2014/004030
Authority: WO
Inventors: 이동근; 나용대
Original assignee: 주식회사 경동나비엔
Priority date: 2013-05-08
Filing date: 2014-05-07
Publication date: 2014-11-13
Also published as: AU2014263407A1; RU2633003C2; CN105209876A; KR20140132597A; CN105209876B; AU2014263407B2; KR101489688B1; RU2015152429A

Abstract

The present invention relates to an apparatus for measuring a differential pressure in an air blower, comprising: a bell mouth provided with an inlet for introducing air into the air blower; a differential pressure cover coupled to the bell mouth for transmitting an inlet pressure change through a tube; and a differential pressure measuring unit for detecting the inlet pressure change transmitted through the tube. According to the present invention, a differential pressure is measured in an intake port side of the air blower in which an air flow is most stable, while keeping the apparatus from acting as an air flow resistor so as to prevent the occurrence of turbulence, thereby allowing an accurate measurement of the differential pressure.

Description

Differential pressure measuring device of blower

The present invention relates to a differential pressure measuring device of the blower, and more particularly to a differential pressure measuring device of the blower for accurately measuring the differential pressure of the air supplied for proportional control of the boiler.

Heating and hot water boilers used in homes are divided into oil boilers and gas boilers according to the fuel used. Among these, gas boilers with low air pollution and easy use are mainly used, and liquefied natural gas (LNG) is used as the fuel.

Gas boilers are classified into condensing and non-condensing methods according to heat exchangers for heating heating water. Among them, the condensing-type gas boiler heats the heating water directly by using combustion heat and absorbs the latent heat of condensation of the exhaust gas again, thereby maximizing thermal efficiency.

An example of a commonly used condensing gas boiler will be described. A burner is installed at an upper portion to ignite and burn down a gas mixed with air, and a heating water is heated using a hot combustion gas in a heating heat exchanger installed at a lower portion thereof. The heating operation is performed by circulating the heated water into the room and the living room.

In addition, when the hot water is operated, the three-way valve is operated to cut off the hot water supplied to the room and the living room, convert it into a hot water supply heat exchanger installed in parallel, and use it as a heating source. The hot water is heated while supplying and returning the hot water, and the warmed hot water is used for washing and bathing.

The gas boiler configured as described above can be divided into various types according to the control method or the sealed state. In particular, the air proportional control method measures the pressure of air introduced from the outside, and then measures the pressure of the burner in proportion to the measured air pressure. By supplying fuel, by supplying the correct amount of fuel in proportion to the inlet air pressure, it is possible to increase the combustion efficiency and to prevent the emission of harmful gases to prevent environmental pollution.

That is, since the variable to control the gas amount is changed only depending on the air pressure, even if the proportional control part of the gas valve is not controlled separately, a certain amount of gas is discharged to a constant air pressure, so that it has a constant air ratio. Unlike the proportional control method, accurate proportional control is possible.

Such an air proportional control boiler is described in detail in the applicant Patent No. 10-0406472 (air proportional control boiler using a wind pressure sensor, registered November 7, 2003). As shown in FIG. 1 of the Patent No. 10-0406472, the conventional boiler is an air pressure detecting unit for detecting the pressure of the air supplied from the blower to perform the air proportional control (reference numeral in FIG. 1 of the Patent No. 10-0406472). 50).

The air pressure detection unit is configured to detect the pressure of the air supplied to the burner at the outlet end of the blower, and a method of detecting the differential pressure of the supplied air is used.

A differential pressure flowmeter can be used to detect the flow rate by measuring the differential pressure of the air, and in general, a tightening mechanism is provided in the middle of the pipeline through which the fluid flows to narrow the passage area of the fluid. Due to the resistance generated, the pressure difference between the front and rear ends of the tightening mechanism is generated, and the differential pressure is transmitted to the manometer through the differential pressure transmitter to detect the flow rate according to the change of capacitance according to the differential pressure.

In this way, the amount of air supplied can be detected in the related art, but as described above, a new problem may occur in that a tightening mechanism, which is an air pressure detecting unit, is installed to protrude inside the outlet end of the blower.

1 is a configuration diagram of a differential pressure measuring device of a conventional blower.

Referring to FIG. 1, a general blower includes a housing 1 having an outlet end 4 provided on one side thereof and an inlet 3 formed at a central portion of the front surface thereof, and housed inside the housing 1 to an external motor. It is configured to include an impeller (2) to rotate in accordance with the drive of (not shown), to discharge the air intake through the intake port (3) through the outlet end (4).

In order to detect the amount of air supplied through the blower having such a configuration, the air pressure detecting unit 5 is provided so as to protrude from the inner part of the outlet end 4 toward the center side of the outlet end 4.

The air pressure detecting unit 5 is a tightening mechanism described above, and for example, a venturi tube, an orifice, a flow nozzle V-cone may be used.

However, since the air pressure detection unit 5 is provided to protrude inside the outlet end 4, it acts as a resistance of the flow path through which air is supplied, and turbulence is formed around the air pressure detection unit 5.

Therefore, when the differential pressure of the conventional air pressure detection unit 5 is measured while the exhaust is closed in the boiler, the differential pressure is not fixed but fluctuates. That is, it is normal for the differential pressure to be 0 mmH ₂ O at the time of exhaust closing, but in the conventional manner, the differential pressure is not fixed and the value is varied.

In addition, since the air pressure detection unit 5 is provided only in a part of the outlet stage 4, when a difference in air flow rate occurs in a part of the outlet stage 4, an accurate amount of air cannot be detected. In order to achieve this, the number of air pressure detectors 5 needs to be increased. However, as described above, the air pressure detector 5 acts as a resistance of the air supply, thereby preventing the smooth supply of air.

According to the differential pressure measurement result of the air pressure detection unit 5, the controller of the boiler to perform the air proportional control can not accurately control, there is a problem that the efficiency is inevitably lowered.

The problem to be solved by the present invention in view of the above problems is to provide a differential pressure measuring apparatus of the blower capable of accurately measuring the flow rate of the air supplied through the blower.

In particular, the present invention is to provide a differential pressure measuring device of the blower to be able to converge to 0 mmH ₂ O, the result of measuring the differential pressure of the air supplied from the blower in the exhaust closed state of the boiler.

In addition, another object of the present invention is to provide a differential pressure measuring apparatus for a blower capable of reducing errors by detecting common differential pressures at various positions without disturbing the flow of air.

The differential pressure measuring device of the blower of the present invention for solving the above problems, the bell mouth is provided with an inlet for the air inlet to the blower, and the differential pressure cover is coupled to the bell mouse to transfer the pressure change of the inlet through the tube And a differential pressure measuring unit for detecting a pressure change of the inlet that is transmitted through the tube.

The differential pressure cover is a ring-shaped structure coupled to the edge of the inlet, and the differential pressure hole provided in the inner diameter direction of the ring-shaped structure to be located at the edge of the inlet, the communication with the differential pressure hole, the tube protruding so that the tube can be coupled It may include a coupling tube.

The differential pressure hole may be provided in plural, and may further include a connection flow path interconnecting the plurality of differential pressure holes.

The differential pressure hole may be a hole provided toward an inner diameter portion of the differential pressure cover, or a groove provided on a rear surface of the differential pressure cover, and formed between the bell mouse.

The differential pressure measuring unit may detect a differential pressure between the pressure in the tube and the internal pressure of the boiler.

In the present invention, the differential pressure measuring apparatus of the blower measures the differential pressure at the intake port side where the air flow is most stable in the blower, but does not act as a resistance to the flow of air, thereby preventing the occurrence of turbulence, thereby enabling accurate measurement of the differential pressure. have.

In addition, the present invention provides a plurality of measuring holes connected by the interconnection flow path of the bell mouse installed in the inlet of the blower, so that the differential pressure measurement error can be minimized even when there is a difference in some of the air intake through the inlet of the blower. It can be effective.

In particular, the present invention, when the differential pressure is measured in the exhaust closed state of the boiler, the measurement result of the differential pressure converges to 0 mmH ₂ O, it is possible to improve the boiler efficiency by improving the accuracy of the proportional control of the boiler by preventing the fluctuation occurs It works.

2 is an exploded perspective view of the differential pressure measuring apparatus of the blower according to the preferred embodiment of the present invention.

3 is a cross-sectional view of the bonding state of FIG.

Figure 4 is a partially cutaway perspective view of the bell mouse of the blower differential pressure measuring apparatus of the present invention.

5 is an explanatory diagram for explaining the operation concept of the blower differential pressure measuring apparatus of the present invention.

Description of the sign

10: Housing 11: Exit

20: Impeller 30: Cover part

40: Bell Mouse 41: Supply port

50: differential pressure cover 51: differential pressure hole

52: connection path 53: tube connector

54: tube 55: differential pressure measurement

EMBODIMENT OF THE INVENTION Hereinafter, the differential pressure measuring apparatus of the blower of this invention is demonstrated with reference to attached drawing.

Figure 2 is an exploded perspective view of the differential pressure measuring apparatus of the blower according to a preferred embodiment of the present invention, Figure 3 is a cross-sectional configuration of the coupled state of Figure 2, Figure 4 is an explanatory diagram for explaining the differential pressure measurement of the present invention.

2 to 4 respectively, the differential pressure measuring apparatus of the blower according to the preferred embodiment of the present invention is accommodated in the housing 10 of the blower, the impeller 20 is rotated by the rotation of the motor (not shown) And a cover part 30 which covers the front surface of the housing 10 in which the impeller 20 is accommodated, and provides an exposure hole 31 through which the central part of the impeller 20 is exposed, and the cover part 30. Is coupled to the front surface of the bell mouse (40) and the bell mouth (40) to allow the air to enter through the exposure hole 31, to provide an inlet (41) to prevent the occurrence of turbulence of the incoming air, It is composed of a differential pressure cover (50) having a differential pressure hole (51) coupled to the front surface of the periphery of the inlet (41) to allow the pressure when air is introduced through the inlet (41).

The differential pressure hole 51 is located at the edge of the inlet 41 of the bell mouse 40, and communicates with the tube connecting tube 53 provided on the front of the differential pressure cover 50, one end is The other end of the tube 54 connected to the tube connecting tube 53 is connected to the differential pressure measuring unit 55 to transmit the pressure when the air is introduced through the inlet 41 to the differential pressure measuring unit 55.

Hereinafter, the differential pressure measuring apparatus of the blower according to the preferred embodiment of the present invention configured as described above will be described in more detail.

First, the blower housing 10 accommodates the impeller 20 to supply the intake air according to the driving of the impeller 20 to the burner side of the boiler, and the impeller 20 receiving portion has a cylindrical receiving space. The outlet end 11 is in the form of a narrow tube compared with the receiving space.

The front surface of the housing 10 has an open structure, and the cover part 30 is coupled to the open front surface of the housing 10. The shape of the cover portion 30 is the same as the shape of the open surface of the housing 10, the exposure hole 31 for exposing the central portion of the impeller 20 to the outside is provided. As the impeller 20 rotates, air is supplied to the center portion, and the supplied air is blown outward, and an exposure hole 31 is provided in the cover portion 30 to supply air.

The bell mouse 40 is coupled to the front surface of the cover part 30 in which the exposure hole 31 is provided.

The role of the bell mouse 40 is a structure in which the periphery of the supply port 41 is inclined toward the center of the impeller 20 so that the air supply port 41 is located closer to the center of the impeller 20. Has

In addition, the inclined surface around the supply port 41 is formed to have a gentle curvature so as to prevent the occurrence of turbulent flow of the incoming air.

In such a structure, the differential pressure cover 50 is coupled to the front surface of the bell mouse (40). The differential pressure cover 50 is coupled to the circumference of the supply port 41 provided in the central portion of the bell mouse 40, it is an annular structure having the same inner diameter as the supply port 41.

The differential pressure cover 50 is provided with a differential pressure hole 51 at the edge of the supply port 41 in the direction toward the inner diameter, the tube connecting pipe 53 communicating with the differential pressure hole 51 protrudes on the front surface have.

The differential pressure hole 51 may be directly provided in the differential pressure cover 50 or may be formed between the bell mouse 40 by providing a groove in the rear surface of the differential pressure cover 50.

In this configuration, when the impeller 20 rotates, air is introduced into the housing 10 through the supply port 41 provided at the center of the impeller 20. The introduced air is blown to the outside of the impeller 20, and is supplied to the burner of the boiler through the outlet end 11 of the housing 10.

At this time, the supply port 41 serves as a tightening mechanism for measuring the differential pressure, and as air flows into the housing 10 through the supply port 41, the pressure of the supply port 41 is lowered.

As the pressure of the supply port 41 is lowered, the pressure of the differential pressure hole 51 is lower than that of the inner pressure, so that the air inside is discharged to the outside, and the change in the pressure is as shown in FIG. 4. The inner pressure of the tube connecting tube 53 and the tube 54 is lowered.

As a result, the pressure of the supply port 41 is transmitted to the first pressure P1 on one side of the differential pressure measuring unit 55 through the tube 54. The other end pressure of the differential pressure measuring unit 55 is a second pressure P2 which is an internal pressure of the boiler, and the differential pressure measuring unit 55 measures the differential pressure between the second pressure P2 and the first pressure P1. .

The deformation plate 56 provided inside the differential pressure measuring unit 55 is deformed by the differential pressure between the first pressure P1 and the second pressure P2, and the deformation degree is different depending on the magnitude of the differential pressure. Thus, the change in capacitance according to the magnitude of the differential pressure is detected.

However, the differential pressure measuring unit 55 may be changed to a differential pressure sensor in various ways as necessary.

At this time, the differential pressure hole 51 provided on the side of the supply port 41 does not act as a resistance to the flow path of the air supplied into the housing 10 through the supply port 41, the front surface of the differential pressure cover 50 The streamlined structure prevents turbulence. Therefore, it is possible to prevent the occurrence of variables in the pressure measurement and to measure the accurate differential pressure.

The amount of air supplied through the blower may be calculated by Equation 1 below.

Equation 1

Where rs is the standard air specific volume, r is the specific volume of current air, delta P is the measured differential pressure, and K is a constant.

Therefore, it is possible to detect the precise amount of air supplied to the burner of the boiler by the accurate differential pressure value measured by the differential pressure measurement unit 55, thereby improving the accuracy of the air proportional control.

5 is a partial cutaway cross-sectional view of the coupled state of the bell mouse 40 and the differential pressure cover 50 according to another embodiment of the present invention.

Referring to FIG. 5, the differential pressure cover 50 is provided with a plurality of differential pressure holes 51 in contact with the supply port 41 of the bell mouse 40, and connects the plurality of differential pressure holes 51 with each other. The flow path 52 is included.

Such a configuration is provided with a plurality of differential pressure holes 51 described in detail in the previous embodiment, the pressure of the supply port 41 is measured at various measurement positions, and the average pressure thereof is one end of the differential pressure measuring unit 55 It is reflected in.

This minimizes the pressure measurement error that may occur when only one differential pressure hole 51 is provided, thereby enabling a more accurate measurement of the differential pressure, thereby improving the reliability of the differential pressure measurement and the amount of supply air calculated by the measured differential pressure. do.

FIG. 6 is an explanatory diagram for explaining the pressure of the supply port 41 reflected by the differential pressure hole 51 and the connection flow path 52 in FIG. 5.

Referring to FIG. 6, four differential pressure holes 51 are disposed along a circumference of the supply port 41, and each of the four differential pressure holes 51 is connected by a connection flow path 52.

A tube 54 connected to the tube connecting tube 53 communicating with one of the differential pressure holes 51 is connected to one end of the differential pressure measuring unit 55.

When the pressures around the differential pressure holes 51 are P1-1, P1-2, P1-3, and P1-4, respectively, despite the difference in pressure, the internal pressure of the tube 54 is P1- of each pressure. 1, P1-2, P1-3, and P1-4 are shown as the average value P1, and the differential pressure measuring unit 55 measures the difference between the internal pressure P2 of the boiler and the average pressure value P1 of the supply port 41. Thus, the reliability of the differential pressure measurement can be improved.

In addition, a plurality of detection positions of the pressure at the supply port 41 may be prevented from acting as a resistance to the flow of air supplied through the supply port 41, thereby preventing the intervention of variables causing errors such as the generation of turbulence. Can be.

7 is a graph of the measurement results of the differential pressure measuring unit 55 according to the exhaust closing pressure.

The blower used in the measurement was ACEIII 20K, and the differential pressure was decreased as the exhaust closing pressure was increased, and the differential pressure was measured without change within ₅ mmH ₂ O while the exhaust closing pressure exceeded 15 mmH ₂ O. Variation here means that the measured differential pressure increases despite the increase in the exhaust closing pressure.

Although not shown in the graph, the differential pressure is detected as 0 mmH ₂ O in the state of completely exhaust closing.

As described above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above-described embodiments, and various modifications are made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It is possible to carry out by this and this also belongs to the present invention.

The present invention can accurately measure the differential pressure of the blower, it is possible to increase the accuracy of the proportional control of the boiler, there is industrial applicability.

Claims

Bell mouse provided with an inlet for air to the blower;

A differential pressure cover coupled to the bell mouse to transfer a pressure change of the inlet through a tube; And

Differential pressure measuring apparatus of the blower comprising a differential pressure measuring unit for detecting the pressure change of the inlet port transmitted through the tube.
The method of claim 1,

The differential pressure cover,

Ring-shaped structure is coupled to the edge of the inlet,

A differential pressure hole provided in an inner diameter direction of the ring-shaped structure to be located at an edge of the inlet; And

The differential pressure measuring apparatus of the blower in communication with the differential pressure hole, and including a tube coupling tube protruding so that the tube can be coupled.
The method of claim 2,

The differential pressure hole is provided in plurality,

The differential pressure measuring apparatus of the blower further comprising a connection flow path for interconnecting the plurality of differential pressure holes.
The method according to claim 2 or 3,

The differential pressure hole,

Or a hole provided toward an inner diameter portion of the differential pressure cover;

The pressure difference measuring apparatus of the blower characterized by the groove provided in the back of the said differential pressure cover, and between the said bell mouse.
The method according to any one of claims 1 to 3,

The differential pressure measuring unit,

And a differential pressure measurement device for detecting a pressure difference between the pressure in the tube and the internal pressure of the boiler.