JPH047418Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a pressure proportional valve that maintains a constant mixing ratio of air and gas in a combustor such as a burner.

[Conventional technology]

As a conventional technique for keeping the mixing ratio of air and gas constant in a combustor such as a burner, a pressure equalizing valve 2 is provided in the middle of a gas supply path 1 as shown in FIG.
The gas pressure and the air pressure are equalized by loading from the downstream side of the combustion amount adjustment valve 4 of the air supply path 3 of the pressure equalizing valve 2, and the gas pressure and the air pressure are made equal to each other by loading the air supply path 3 of the pressure equalizing valve 2.
The mixing ratio was kept constant through the apertures 5 and 6 at the end.

[The problem that the idea aims to solve]

Since the air supply path is loaded into the pressure equalizing valve of the gas supply path to make the gas pressure and air pressure the same, air pressure higher than the gas pressure is required.

As a result, the size of the blower increases, which increases cost and also increases noise.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention includes a case with a passage in which a valve seat is provided on the internal partition plate, and a first valve seat on the passage side that is provided inside the case in parallel with the valve seat.
A first chamber, a second chamber, a third chamber, a fourth chamber separated by a diaphragm, an intermediate second diaphragm, a third diaphragm having a pressure receiving area smaller than the pressure receiving area of the second diaphragm, and the primary side of the passage. and a first chamber, a through hole provided so that the secondary side of the passage and the second chamber communicate with each other, and a third chamber and the atmosphere, and a through hole provided to allow gas to flow into the fourth chamber. an inlet, a valve body located on the secondary side of the passage, corresponding to the valve seat, and having a pressure receiving area equivalent to that of the first diaphragm; and a first diaphragm and a second diaphragm connected from the valve body. , and a valve stem supported by a third diaphragm.

[Effect]

By connecting an air supply path to the passage and loading the gas pressure of the gas supply path into the fourth chamber to obtain air proportional to fluctuations in gas pressure, a constant mixing ratio can be maintained at all times.

〔Example〕

In the figure, 11 is a housing, and 12 is a passage that is integrated with the housing 11 by providing a valve seat 14 on an internal partition plate 13.

Also, inside the housing 11, a first diaphragm 15 is provided on the passage 12 side, which is provided parallel to the valve seat 14 and has the same pressure receiving area as the valve seat 14, and a second diaphragm located in the middle.
A first chamber 18, a second chamber 19, a third chamber 20, and a fourth chamber 21 are provided by a third diaphragm 17 having a pressure receiving area smaller than that of the diaphragm 16 and the second diaphragm 16. .

The primary side of the passage 12 and the first chamber 18 are connected to a through hole 22
Therefore, the second chamber 19 and the secondary side of the passage 12 communicate with each other through the through hole 23, and the third chamber 20 and the atmosphere communicate with each other through the through hole 24.

25 is an inlet provided to allow gas to flow into the fourth chamber 21.

26 is located on the secondary side of the passage 12 and is attached to the valve seat 14.
The valve body corresponds to the pressure receiving area of the first diaphragm 15 and has a pressure receiving area equivalent to the pressure receiving area of the first diaphragm 15. It is supported by penetrating the section in an airtight manner.

29 is a spacer fitted on the outside of the valve stem 28.

The pressure proportional valve A configured as described above has a second
As shown in the figure, an air supply passage 31 is connected to the passage 12, and the inlet 25 is loaded from the downstream side of the combustion flow rate regulating valve 33 of the gas supply passage 32 (indicated by a dashed line with an arrow in the figure).

In the figure, reference numerals 34 and 35 are throttles provided at the ends of the air supply path 31 and the gas supply path 32.

The gas pressure controlled by the combustion flow rate adjustment valve 33 flows into the fourth chamber 21 from the inlet 25 and acts on the third diaphragm 17, causing the valve body 26 to rise together with the valve stem 28 (see Figure 1). (in the opening direction) to open the pressure proportional valve A.

Also, air from the blower 36 is introduced into the primary side of the passage 12, and as the pressure proportional valve A opens, the air flowing into the second chamber 19 from the through hole 23 acts on the second diaphragm 16. stick 2
8 and lower the valve body 26 (in the closing direction in Figure 1)
let

Therefore, the pressure acting on the third diaphragm 17 and the pressure acting on the second diaphragm 16 are balanced.

〔effect〕

As described above, according to the pressure proportional valve according to this invention, it is possible to obtain air pressure proportional to fluctuations in gas pressure, so that a constant mixing ratio is always maintained.

Therefore, it is possible to eliminate the problem of the blower becoming large and making noise due to the need for air pressure higher than gas pressure.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the pressure proportional valve according to this invention, FIG. 2 is a circuit diagram showing an example of its use, and FIG. 3 is a conventional circuit diagram. A... Pressure proportional valve, 11... Housing, 12... Passage, 13... Partition plate, 14... Valve seat, 15... First diaphragm, 16... Second diaphragm, 1
7... Third diaphragm, 18... First chamber, 19
...2nd room, 20...3rd room, 21...4th room,
22, 23, 24...Through hole, 25...Inflow port, 2
6... Valve body, 28... Valve stem.

Claims (1)

[Scope of utility model registration request] A housing with a passage with a valve seat on the internal partition plate,
A first diaphragm on the passage side provided in the housing in parallel with the valve seat, a second diaphragm in the middle,
The first diaphragm is separated by a third diaphragm having a pressure receiving area smaller than the pressure receiving area of the second diaphragm.
chamber, a second chamber, a third chamber, a fourth chamber, the primary side of the passage and the first chamber, the secondary side of the passage and the second chamber, and the third chamber and the atmosphere, respectively. A through hole provided, an inlet port provided to allow gas to flow into the fourth chamber, and a pressure receiving area located on the secondary side of the passage to correspond to the valve seat and having a pressure receiving area equivalent to the pressure receiving area of the first diaphragm. A pressure proportional valve comprising a valve body having a large area and a valve stem connected to the valve body and supported by a first diaphragm, a second diaphragm, and a third diaphragm.