JPH0129419Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a blowing pressure detection device used in forced air combustion appliances.The purpose of this invention is to simplify the structure and reduce the number of steps during manufacturing and assembly. The purpose of this invention is to improve productivity and contribute to the miniaturization of instruments.

As shown in FIGS. 1 and 2, this type of conventional blow pressure detection device is applied to a forced air water heater M, in which a blower m and a wind pressure switch h are individually arranged, and the discharge of the blower m is A blowing pressure detecting device R is known in which a pressure detector 1 faces a predetermined position on a passage 3, and the pressure detector 1 and the working chamber j of the wind pressure switch h are communicated through a connecting pipe 4. (Refer to Japanese Utility Model Application Publication No. 56-14495, which was previously filed by the present applicant.) Since the well-known air blowing pressure detection device R has a complicated structure, it requires a large number of steps during manufacturing and assembly. Not only does this increase costs, but it also seriously hinders productivity improvement.

Moreover, the set of component parts related to these blowing pressure detection devices has become large, which is an obstacle to downsizing the device.

In order to overcome the drawbacks of conventional products as described above, the present invention integrates a blower, a pressure detection path, and a wind pressure switch to achieve a more compact size.
The present invention provides an air blowing pressure detection device that contributes to downsizing of equipment.

Hereinafter, one embodiment of the blowing pressure detection device of the present invention will be described based on FIGS. 3 and 4.

1 and 2, which will be explained below.
The same reference numerals as those shown in the figures indicate the same parts.

FIG. 4 shows a schematic configuration diagram in which the air blowing pressure detection device R' of the present invention is applied to a forced air water heater. A water supply tap d and a running water switch e are provided on the upstream side, and a hot water tap f is provided at the downstream end. g is a heat absorbing part b disposed at the lower part of the heater a.
A gas burner k is a gas electromagnetic valve disposed in a gas conduit n, and the supply of gas is stopped by response operation of a wind pressure switch h, which will be described later. p is a pilot burner q disposed close to the gas burner g at the end of a conduit branching from the gas conduit n upstream of the gas solenoid valve k;
is an exhaust pipe provided at the upper opening end of the heater a, s is a power source, _t1 is a contact point of the water flow switch e,
t ₂ indicates the contact point of the air pressure switch h, and M indicates the body of the forced air water heater.

Next, the configuration of the blowing pressure detection device R' of the present invention will be explained based on FIGS. 3 and 4.

Reference numeral 5 denotes a box that surrounds the impeller 6 of the blower m, and an air suction hole 8 in which a motor 7 for driving the impeller 6 is built into the side wall of the box that opens on the suction side of the box 5.
A cover 8 having a is fixed by screws 9,
A diaphragm case 10, which is an element component of a wind pressure switch h to be described later, is formed integrally with the case 5 on the side wall of the case opposite to the suction side. Reference numeral 1 denotes a tubular pressure detector with a closed tip and a small diameter detection hole 2 bored in the side slightly in front of the tube. At this position, the opening of the detection hole 2 faces perpendicularly to the air flow at an appropriate distance from the wall surface of the case on the distal side, and its base end is fitted into the diaphragm case 10. The wind pressure switch h is a diaphragm case 10 formed on the side wall of the casing 5, and a diaphragm 11 that partitions an atmosphere communication chamber i and an action chamber j, and a diaphragm 11 on which a switch element member having the contact point _t2 is mounted. cover 12
are attached with screws 9. Reference numeral 13 denotes an operating rod, the base end of which is fixed to the diaphragm 11, the tip of which projects from the diaphragm cover 12 and faces the contact point _t2 . Reference numeral 14 denotes a small diameter atmospheric communication hole bored at an appropriate position in the diaphragm cover 12.

The blowing pressure detecting device R' of the present invention has the blower m, the pressure detector 1, and the wind pressure switch h compactly integrated as described above, and therefore operates as described below.

As shown in Figures 3 and 4, when the pilot burner p is ignited by an appropriate means and the pilot flame is confirmed, when the hot water tap f is opened, water flows through the connecting pipe c, causing water to flow. Switch e senses water pressure, contact _t1 closes, impeller 6 starts rotating,
Air necessary for combustion in the gas burner g is forcibly delivered into the heater a. At this time, air sucked into the blower m from the air suction hole 8a by the rotation of the impeller 6 flows along the inner circumference of the casing 5 and is sent to the discharge path 3.

At this time, the velocity distribution of the air flow is faster when it flows along the wall surface on the centrifugal side, so the faster air flow passes through the front surface of the detection hole 2, and the inside of the pressure detector 1 and the action chamber j is Since the pressure becomes negative, the diaphragm 11 is drawn toward the diaphragm case 12, and the working rod 13 moves forward, closing the contact _t2 and opening the gas solenoid valve k. Therefore, gas is supplied to the gas burner g, which is ignited by the pilot burner p to start combustion. The combustion gas generated by this combustion rises in the heater a, heats the heat absorption part b, becomes exhaust gas, and is discharged from the exhaust pipe q.

Next, during this combustion, if for example the opening of the exhaust stack q is blocked for some reason and exhaust gas discharge is suppressed, the air supply pressure in the heater a will naturally increase, and the pressure detection Detection hole 2 of device 1
Since the positive pressure received in the discharge passage 3 is immediately applied to the air pressure switch h, the diaphragm 11 of the wind pressure switch h is pressed toward the atmosphere ventilation chamber i, contrary to the case described above, and the actuating rod 13 is moved back and the contact point t ₂ is closed. It will be developed. Therefore, the gas solenoid valve k is closed, and the combustion of the gas burner g is immediately stopped.

Note that in the embodiment of the blowing pressure detection device of the present invention, the pressure detector 1 is connected to the action chamber j of the wind pressure switch h to detect negative pressure, but the present invention is not limited to such an embodiment. It is not a device that detects the dynamic pressure of the conventional example described in the specification of the above-mentioned Japanese Utility Model Publication No. 56-14495, or a device that detects the differential pressure between dynamic pressure and static pressure. Needless to say, it's a good thing.

As described above, the blowing pressure detection device of the present invention provides the following effects.

The device of the present invention compactly incorporates the blower m, pressure detector 1, and wind pressure switch h, so the structure is simplified, the number of manufacturing and assembly steps can be reduced, and productivity is increased. You can improve your performance. Further, since the element members related to the blowing pressure detection device are compactly integrated, it can contribute to downsizing the entire forced-air combustion type combustion appliance. Furthermore, the pressure detector 1 is connected to a diaphragm case 1 formed on the side wall of the case of the blower m.
0, the directionality and positioning of the detection hole 2 of the pressure detector 1 can be reliably set constant.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an example of applying a conventional air blow pressure detection device to a forced air water heater, Fig. 2 is a cutaway front view of the main part of Fig. 1, and Fig. 3 is an air blow pressure detection device of the present invention. FIG. 4 is a cutaway front view of the main parts of the device, and is a schematic configuration diagram showing an embodiment in which the device according to the present invention is applied to a forced air water heater. a... Heater, b... Endothermic part, c... Water supply pipe,
d... Water supply valve, e... Water supply switch, f... Hot water tap, g... Gas burner, h... Wind pressure switch,
i...Atmospheric communication chamber, j...Working chamber, k...Gas solenoid valve, m...Blower, n...Gas pipe, p...Pilot burner, q...Exhaust stack, s...Power supply, t ₁ , _t2 ...
... Contact, M ... Body, R, R' ... Blow pressure detection device, 1 ... Pressure detector, 2 ... Detection hole, 3 ...
Discharge path, 4... Connection pipe, 5... Case, 6... Impeller, 7... Motor, 8... Cover, 8a... Air suction hole, 9... Screw, 10... Diaphragm case, 11 ...Diaphragm, 12...Diaphragm cover, 13...Working rod, 14...Atmospheric communication hole.

Claims (1)

[Scope of utility model registration request] A cover containing a built-in motor that drives the impeller is attached to the side wall of the casing on the suction side that surrounds the impeller of a blower used in forced ventilation combustion equipment, and a diaphragm case is integrally formed on the side wall of the casing opposite to the suction side. a pressure detector having a detection hole facing a predetermined position of a discharge path of the blower and whose base end is fitted into the diaphragm case, and a switch element member attached to the diaphragm case via the diaphragm. A blowing pressure detection device characterized by integrally incorporating a wind pressure switch formed by attaching a mounted diaphragm cover.