CN215002307U - Wall surface firewall - Google Patents

Abstract

The utility model discloses a wall prevents hot wall, include: the conductive film is sequentially provided with a first base layer, a conductive layer arranged on the surface of the first base layer and a second base layer covering the conductive layer and bonded with the first base layer; the conductive layer includes a serpentine conductive circuit printed with a thermistor, at least one pair of electrodes in contact with the serpentine conductive circuit and connectable to an external circuit. The utility model can monitor the high temperature flame overflowing from the damaged part in 360 degrees without dead angles, and can protect the combustion chamber and the heat exchanger in all directions; the wall firewall has good adaptability, and the wall firewall with the same specification can be adapted to a plurality of water heaters with different models and sizes; the working condition of the water heater can be monitored by matching with other circuit detection systems and detecting the resistance value change of the thermistor.

Description

Wall surface firewall

Technical Field

The utility model relates to a water heater safety device field especially relates to a wall prevents hot wall suitable for water heater.

Background

When the gas water heater works, gas is combusted in the combustion chamber to form high-temperature flame, and the high-temperature flame generates high-temperature flue gas to heat water in the heat exchanger. When a combustion chamber or a heat exchanger is damaged, high-temperature flame can overflow from the damaged part to ignite the inside of the water heater, and can be burnt to the outside of a shell of the water heater to cause a larger fire disaster in severe cases. Therefore, the gas water heater needs to be provided with a device for preventing the damage of the combustion chamber, and particularly, a strong drum type water heater with a fan at the lower part of the water heater needs to be provided with a device for preventing the damage of the combustion chamber and the heat exchanger.

At present, most of gas water heaters adopt a high-temperature resistant wire to wind a heat exchanger for a circle, and two to three thermal fuses are arranged in the middle of the wire. After damage appears in combustion chamber or heat exchanger, high temperature flame or flue gas overflow, and the thermal fuse is heated, reaches fusing temperature after, the thermal fuse disconnection. And after the water heater control detects that the fuse is disconnected, closing a gas valve of the water heater to extinguish flame.

The disadvantage of this solution is that there are only a few thermal fuses on the overheat protection line, and if the damage occurs at a position far from the thermal fuse, the thermal fuse is hard to fuse, resulting in low detection sensitivity and poor protection effect. If increase thermal fuse's the quantity that sets up, the manufacturing cost of water heater will increase, and the design of whole water heater is comparatively complicated, and the damage control that does not have the dead angle of 360 degrees is difficult to accomplish simultaneously.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a wall surface firewall made of printable thermistor, which is arranged around the combustion chamber and the heat exchanger for a circle, so that the 360-degree damage monitoring of the combustion chamber and the heat exchanger can be realized; the working state of the water heater can be monitored according to the resistance change condition of the thermistor by matching with an additional electric signal processing system.

In order to realize the above purpose, the utility model discloses a technical scheme:

a wall firewall, comprising: the conductive film is sequentially provided with a first base layer, a conductive layer arranged on the surface of the first base layer and a second base layer covering the conductive layer and bonded with the first base layer; the conductive layer includes a serpentine conductive circuit printed with a thermistor, at least one pair of electrodes in contact with the serpentine conductive circuit and connectable to an external circuit.

In some preferred embodiments, the conductive layer further comprises an adhesive disposed between and about the serpentine conductive circuit gap.

In some preferred embodiments, the serpentine conductive circuit has a path width of 3-5 mm.

In some preferred embodiments, the serpentine conductive circuit has a gap width of 4-6 mm.

In some preferred embodiments, the serpentine conductive circuit comprises: a first serpentine conductive circuit configured in a single-layer serpentine arrangement on a plane, and a second serpentine conductive circuit configured in a double-layer serpentine arrangement on the plane; the first serpentine conductive circuit and the second serpentine conductive circuit are conductive and share a pair of electrodes.

In some preferred embodiments, a pair of L-shaped notches is arranged at one side end of the short side of the wall surface firewall; the end parts of the two sides of the long edge far away from the short edge are provided with a plurality of pairs of strip-shaped notches; after the wall surface firewall is bent, the L-shaped notch and the strip-shaped notch are clamped to form an enclosing shape.

In some preferred embodiments, the thermistor used to print the serpentine conductive circuit is a positive temperature coefficient printable thermistor.

In some preferred embodiments, the thermal resistor has a fusing temperature of 200-300 ℃.

Advantageous effects

1. The high-temperature flame overflowing from the damaged part can be monitored at 360 degrees without dead angles, and the combustion chamber and the heat exchanger are protected in an all-round way;

2. the wall firewall has good adaptability, and the wall firewall with the same specification can be adapted to a plurality of water heaters with different models and sizes;

3. the working condition of the water heater can be monitored by matching with other circuit detection systems and detecting the resistance value change of the thermistor.

Drawings

Fig. 1 is a schematic front view of a wall firewall according to the present invention;

fig. 2 is a schematic view of a sectional layered structure of a wall firewall according to the present invention;

fig. 3 is a schematic diagram of a serpentine conductive circuit gap of a wall firewall according to the present invention;

fig. 4 is a schematic view of the serpentine conductive circuit partition of a wall firewall according to the present invention;

fig. 5 is a schematic view of the installation and use of the wall firewall of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further explained with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 1 and fig. 2, the utility model provides a wall surface firewall, include: the manufacturing method comprises the following steps of sequentially arranging a first base layer 1, a conductive layer 3 arranged on the surface of the first base layer 1, and a second base layer 2 covering the conductive layer 3 and bonded with the first base layer 1; the conductive layer 3 comprises a serpentine conductive circuit 301 printed with thermistors, at least one pair of electrodes 302 in contact with the serpentine conductive circuit 301 and connectable to an external circuit.

The first base layer 1 and the second base layer 2 are both plastic films, and the external dimensions and performance parameters of the two are the same, preferably, PET (polyethylene glycol terephthalate) substrate is adopted. The serpentine conductive circuit 301 is designed according to the actual size of the wall firewall and includes a continuous S-shaped trace, and is designed to cover the area of the base layer as large as possible with the thermistor, so that when the firewall is in use, all parts can have high sensitivity to the overflowing high-temperature flame. It will be appreciated that the printable thermistor, also known as a thermal ink resistor, can be used for printing like ink using a particular process and will vary in resistance in response to changes in the temperature to which it is subjected. The specific type and parameters of the thermistor can be determined by those skilled in the art according to actual needs, and the present invention does not make further requirements.

In other preferred embodiments, the thermistor used to print the serpentine conductive circuit 301 is selected to be a positive temperature coefficient printable thermistor in view of the subsequent operation of other monitoring systems, such that the circuit resistance increases with increasing temperature and reaches infinity when blown, thereby maintaining a linear resistance change trend. Furthermore, in order to protect the water heater components such as the combustion chamber and the heat exchanger in all directions, the fusing temperature of the thermistor is considered to be 200 ℃ or 300 ℃. When the ambient temperature exceeds the fusing temperature, the base layer film is fused, the thermistor is fused together, and the resistance smell is changed to infinity. At the moment, a controller can be arranged to forcibly cut off the air source, so that the combustion is forcibly stopped, and the fireproof effect is achieved.

To better illustrate the feasibility of the present invention, the present embodiment provides a specific model of printable thermistor: brand ECM, model CI-2018H, electrical characteristic resistance <11 ohms/square.

In other preferred embodiments, the conductive layer 3 further comprises an adhesive disposed between and around the serpentine circuit 301 in order to fill the gaps and the peripheries of the conductive circuit and to better adhere the first and second substrates 1 and 2 together. It should be understood that the adhesive is necessarily insulative.

As shown in fig. 3, it is further considered that the path width of the serpentine conductive circuit 301 is set to 3-5mm, preferably 4mm, for convenience of printing and better coverage of the blank area. Further, the gap width of the serpentine shaped conductive circuit 301 is set to 4 to 6mm, preferably 5mm, in consideration of eliminating interference between circuits.

In other preferred embodiments, as shown in fig. 4, in order to match combustion chambers and heat exchangers with different shapes and structures and perform the monitoring function without dead angles in 360 degrees, it is considered that the serpentine conductive circuit 301 is designed in segments, and specifically includes: a first serpentine conductive circuit 311 arranged in a single-layer serpentine arrangement on a plane, and a second serpentine conductive circuit 312 arranged in a double-layer serpentine arrangement on a plane; the first serpentine conductive circuit 311 and the second serpentine conductive circuit 312 are conductive and share a pair of electrodes 302. It should be understood that the conductive circuit is now a closed loop.

As shown in fig. 1, in other preferred embodiments, for convenience of installation, a pair of L-shaped notches 4 is provided at the end of one side of the short side of the wall firewall; the end parts of the two sides of the long edge far away from the short edge are provided with a plurality of pairs of strip-shaped notches 5; after the wall surface firewall is bent, the L-shaped notch 4 and the strip-shaped notch 5 are clamped to form an enclosing shape. In this way, the firewall can be conveniently placed around the combustion chamber and heat exchanger and then finally secured by other means, such as by attaching mounting blocks. And, a plurality of setting to strip breach 5 can make the firewall on wall have good suitability, and the firewall on wall of same specification can adapt to a plurality of water heaters of different model sizes.

The utility model also provides a wall prevents hot wall practical application embodiment, as shown in FIG. 5, prevent hot wall bending with the wall, around the installation of 6 rounds of heat exchanger, realize detecting simultaneously the temperature of 6 four faces of heat exchanger. In other preferred embodiments, the temperature can be more accurately monitored and the combustion condition can be controlled by matching with other monitoring systems and controllers. It should be understood that the heat exchanger 6 of the present invention includes a combustion chamber at a lower portion and a heat exchange portion at an upper portion.

The utility model discloses an operating condition as follows:

the resistance value of the thermistor forming the conductive circuit in the wall surface firewall can change along with the change of the ambient temperature, and the controller of the water heater can monitor the temperature of the heat exchanger at any time by acquiring the resistance value of the thermistor. When the monitored temperature exceeds a certain value, the abnormality of the heat exchanger can be judged, the main controller can display an alarm prompt on a display panel of the water heater and simultaneously send out a buzzer prompt. Therefore, the abnormal condition of the combustion system of the water heater is prompted to the user, and the water heater needs to be overhauled. If the temperature is further increased, the plastic film is melted when the melting point of the plastic film is reached, and the thermistor on the plastic film is also fused together, so that the resistance becomes infinite. The controller will force the gas supply to be cut off, and the combustion will be forced to stop. On the contrary, when the controller detects that the resistance value of the thermistor is smaller than a certain value, the thermistor is considered to be in fault, and the main controller can display an alarm prompt on a display panel of the water heater and simultaneously give out a buzzer prompt. Therefore, the user is prompted that the firewall system of the water heater is abnormal and needs to be overhauled. Furthermore, after the water heater starts to operate and stops operating, the temperature around the firewall gradually rises or falls, and a time process is available, for example, about 10 seconds to 25 seconds, so a temperature change detection program can be added in the process to judge whether the operating state of the water heater is normal.

The above examples are only for reference of the skilled person in the art when designing the control system and should not be interpreted as limiting the scope of the invention.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. Wall firewall, its characterized in that includes: the manufacturing method comprises the following steps of sequentially arranging a first base layer (1), a conductive layer (3) arranged on the surface of the first base layer (1), and a second base layer (2) covering the conductive layer (3) and bonded with the first base layer (1); the conductive layer (3) comprises a serpentine conductive circuit (301) printed with a thermistor, at least one pair of electrodes (302) in contact with the serpentine conductive circuit (301) and connectable to an external circuit.

2. The wall firewall according to claim 1, wherein: the conductive layer (3) further comprises an adhesive disposed at the gap and periphery of the serpentine conductive circuit (301).

3. The wall firewall according to claim 1, wherein: the path width of the serpentine conductive circuit (301) is 3-5 mm.

4. A wall firewall according to claim 1 or 3, wherein: the width of the gap of the serpentine conductive circuit (301) is 4-6 mm.

5. The wall firewall according to claim 1, wherein the serpentine conductive circuit (301) comprises: a first serpentine conductive circuit (311) arranged in a single-layer serpentine arrangement on a plane, and a second serpentine conductive circuit (312) arranged in a double-layer serpentine arrangement on a plane; the first serpentine conductive circuit (311) and the second serpentine conductive circuit (312) are conductive and share a pair of electrodes (302).

6. The wall firewall according to claim 1, wherein: a pair of L-shaped notches (4) is formed in the end part of one side of the short side of the wall surface firewall; the end parts of the two sides of the long side, which are far away from the short side, are provided with a plurality of pairs of strip-shaped notches (5); after the wall surface firewall is bent, the L-shaped notch (4) and the strip-shaped notch (5) are clamped to form an enclosing shape.

7. The wall firewall according to claim 1, wherein: the thermistor used to print the serpentine conductive circuit (301) is a positive temperature coefficient printable thermistor.

8. The wall firewall according to claim 1 or 7, wherein: the fusing temperature of the thermistor is 200-300 ℃.

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