CN212566331U

CN212566331U - Wind pressure switch assembly and gas wall-mounted furnace comprising same

Info

Publication number: CN212566331U
Application number: CN202021044973.2U
Authority: CN
Inventors: 孙陈欢
Original assignee: Bosch Thermotechnology Shanghai Co Ltd
Current assignee: Bosch Thermotechnology Shanghai Co Ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-02-19
Anticipated expiration: 2030-06-09

Abstract

The utility model discloses a wind pressure switch assembly, it includes: the wind pressure switch comprises a first detection port and a second detection port which are respectively communicated with a first detection cavity and a second detection cavity of the wind pressure switch, and the first detection cavity and the second detection cavity are separated by a separator; the pressure measuring device comprises a first pressure measuring port and a second pressure measuring port; the connecting pipe comprises a first connecting pipe and a second connecting pipe, one end of the first connecting pipe is connected with the first detection port, the other end of the first connecting pipe is connected with the first pressure taking port, one end of the second connecting pipe is connected with the second detection port, and the other end of the second connecting pipe is connected with the second pressure taking port; wherein the pressure taking device is configured to have the air pressures at the first pressure taking port and the second pressure taking port both negative pressures and different from each other when the air flow passes through the pressure taking device. The wind pressure switch assembly effectively solves the problem that condensed water is easily formed in the connecting pipe to cause the blockage of the connecting pipe.

Description

Wind pressure switch assembly and gas wall-mounted furnace comprising same

Technical Field

The utility model relates to a gas hanging stove especially relates to a gas hanging stove that is used for wind pressure switch subassembly of gas hanging stove and includes this kind of wind pressure switch subassembly.

Background

The gas hanging stove generally includes the fan and with the wind pressure switch subassembly of fan combination use, when the fan unexpected stall, rotational speed reduce or advance the exhaust passage and block up and lead to the displacement not enough or when unable exhaust, the wind pressure switch subassembly will automatic disconnection, makes the gas hanging stove stop operation to ensure the safety in utilization of gas hanging stove.

The wind pressure switch assembly in the prior art generally comprises two connecting pipes, namely a positive pressure pipe and a negative pressure pipe, and in the using process, high-temperature flue gas generated by combustion in the gas wall-mounted boiler flows into the positive pressure pipe through a pressure taking device. Because the positive pressure pipe is usually in a relatively low-temperature environment, water vapor in high-temperature flue gas is cooled to form condensed water, and the condensed water blocks the positive pressure pipe, so that the wind pressure switch assembly cannot detect wind pressure. At this moment, even if the fan operation of gas hanging stove is normal and advance exhaust passage and keep unobstructed, the trouble siren in the gas hanging stove still can send out the police dispatch newspaper to lead to gas hanging stove to shut down, this normal use that has seriously influenced the consumer.

The device for preventing the condensate water from being generated in the connecting pipe of the wind pressure switch assembly of the gas wall-mounted furnace comprises a pressure taking device wind shield and a connecting pipe heat preservation and insulation layer, wherein the pressure taking device wind shield is arranged above the pressure taking device of the gas wall-mounted furnace, and the connecting pipe heat preservation and insulation layer is arranged on the surface of the connecting pipe of the gas wall-mounted furnace. The utility model discloses an add windshield and thermal insulation layer in gas hanging stove, not only increased the manufacturing and the cost of maintenance of product, can not stop the formation of comdenstion water completely moreover.

Accordingly, there is a need to design an improved wind pressure switch assembly that can prevent the positive pressure pipe from being blocked by condensed water.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a modified wind pressure switch subassembly.

The utility model discloses a wind pressure switch assembly, it includes: the wind pressure switch comprises a first detection port and a second detection port which are respectively communicated with a first detection cavity and a second detection cavity of the wind pressure switch, and the first detection cavity and the second detection cavity are separated by a separator; the pressure measuring device comprises a first pressure measuring port and a second pressure measuring port; the connecting pipe comprises a first connecting pipe and a second connecting pipe, one end of the first connecting pipe is connected with the first detection port, the other end of the first connecting pipe is connected with the first pressure taking port, one end of the second connecting pipe is connected with the second detection port, and the other end of the second connecting pipe is connected with the second pressure taking port; wherein the pressure taking device is configured such that the air pressures at the first and second pressure taking ports are both negative pressures and different from each other when the air flow passes through the pressure taking device.

Preferably, the pressure measuring device is formed by two venturi tubes, the two venturi tubes are respectively provided with an inlet section, a contraction section, a throat and a diffusion section, and the first pressure measuring port and the second pressure measuring port are arranged at the throats of the two venturi tubes and are perpendicular to the flow direction of the airflow.

Preferably, the throat of the two venturis is of different size.

Preferably, the two venturi tubes are integrally formed.

Preferably, the pressure measuring device is made of stainless steel material, the first connecting pipe and the second connecting pipe are hoses, and the first connecting pipe and the second connecting pipe are made of silicon rubber.

Preferably, the separator is a film, and a microswitch is provided on the separator.

Preferably, the connecting pipe is connected with the wind pressure switch and the pressure taking device in a sealing manner.

Preferably, the first detection port and the second detection port of the wind pressure switch are provided to face downward.

The utility model also discloses a gas hanging stove of including above-mentioned wind pressure switch subassembly, wherein, the wind pressure switch with get pressure equipment fixed mounting respectively in the casing and the exhaust passage of gas hanging stove.

Preferably, the casing of gas hanging stove includes the wind pressure switch mount pad, the wind pressure switch passes through snap-fit and installs on the wind pressure switch mount pad.

The utility model discloses a wind pressure switch subassembly is all set up to the negative pressure port through getting two pressure ports with pressure device, thereby has solved the problem that forms the comdenstion water easily in the connecting pipe and lead to its jam effectively.

Drawings

The accompanying drawings are provided to assist the reader in a more thorough understanding of the invention. Throughout the specification, the same or similar reference numbers refer to the same or similar parts, wherein:

FIG. 1 is a schematic view of the installation location of a wind pressure switch assembly in a gas wall-hanging stove;

FIG. 2 is a schematic view of a prior art configuration of a wind pressure switch assembly; and

fig. 3 is a schematic diagram of a configuration of a wind pressure switch assembly according to an embodiment of the present invention.

Reference numbers in the figures: 1,31. wind pressure switch; 2,32. a pressure measuring device; 3.33. a connecting pipe; 1a, a positive pressure detection port; 1b, a negative pressure detection port; 2a, a positive pressure taking port; 2b, a negative pressure taking port; 3a, a positive pressure pipe; 3b, a negative pressure pipe; 31a, a first detection port; 31b. a second detection port; 32a, a first pressure taking port; 32b. a second pressure taking port; 33a. a first connecting tube; 33b. a second connecting tube; 4. a housing of a gas wall-mounted boiler; 5. an air intake passage; 6. an exhaust passage; 7. a wall; 8a, a positive pressure cavity; 8b, a negative pressure cavity; 38a. a first detection chamber; 38b. a second detection chamber; 9,39. separating element

Detailed Description

The present invention will be described below with reference to specific embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration only. Accordingly, the following examples are illustrative only, and the scope of the invention is to be limited only by the following claims.

First, the reason why condensed water is easily formed in the connection pipe of the wind pressure switch assembly in the related art will be described in detail with reference to fig. 1 and 2.

Fig. 1 schematically shows the installation position of the wind pressure switch assembly in the gas wall-hanging stove. As shown in the drawing, the housing 4 of the gas wall-hanging stove is mounted on a wall 7 indoors and is connected outdoors via a forced balance type intake and exhaust passage. The air inlet and outlet channel is a double-layer coaxial sleeve, the air inlet channel 5 between the outer layer sleeve and the inner layer sleeve is used for sucking outdoor air into the combustion chamber for combustion, and the air outlet channel 6 in the inner layer sleeve is used for discharging high-temperature smoke generated by combustion to the outside. The wind pressure switch assembly generally includes a wind pressure switch 1, a pressure taking device 2, and a connection pipe 3 connecting the wind pressure switch 1 and the pressure taking device 2. Generally, the wind pressure switch 1 and the connection pipe 3 are installed in a space communicating with the intake passage 5 in the housing 4 of the gas wall-hanging stove, in which the temperature is relatively low, and the pressure taking device 2 is installed in the exhaust passage 6, in which the temperature is high, for detecting a change in wind pressure therein.

As shown in fig. 2, in the related art wind pressure switch assembly, the wind pressure switch 1 generally includes a positive pressure detection port 1a and a negative pressure detection port 1b, and the cavity thereof is also divided into a positive pressure chamber 8a and a negative pressure chamber 8b by this, which are separated by a partition 9. The partition 9 may be a membrane on which a microswitch is mounted, wherein the membrane deforms with the pressure difference between the positive pressure chamber 8a and the negative pressure chamber 8b, thereby driving the microswitch to open and/or close. The pressure taking device 2 includes a positive pressure taking port 2a and a negative pressure taking port 2b. The connecting pipe comprises a positive pressure pipe 3a and a negative pressure pipe 3b, one end of the positive pressure pipe 3a is connected with a positive pressure detection port 1a of the wind pressure switch 1, and the other end is connected with a positive pressure taking port 2a of the pressure taking device 2; one end of the negative pressure pipe 3b is connected with the negative pressure detection port 1b of the wind pressure switch 1, and the other end is connected with the negative pressure taking port 2b of the pressure taking device 2.

The working process of the wind pressure switch assembly is as follows: when the fan is not started, the air pressures at the positive pressure taking port 2a and the negative pressure taking port 2b of the pressure taking device 2 are both atmospheric pressure and are equal to the air pressures in the positive pressure cavity 8a and the negative pressure cavity 8b of the wind pressure switch 1, so that gas exchange cannot occur between the wind pressure switch 1 and the pressure taking device 2, and no pressure difference exists between two sides of the partition part 9 of the wind pressure switch 1, and the disconnection state is kept; when the fan is started and operates at a certain speed, air flows through the pressure taking device 2 in the direction shown by an arrow in the figure, so that the air pressure at the positive pressure taking port 2a of the fan is larger than the atmospheric pressure, the air pressure at the negative pressure taking port 2b of the fan is smaller than the atmospheric pressure, part of air flows into the positive pressure cavity 8a through the positive pressure pipe 3a, part of air in the negative pressure cavity 8b flows into the pressure taking device 2 through the negative pressure pipe 3b, so that a pressure difference is formed between the positive pressure cavity 8a and the negative pressure cavity 8b of the wind pressure switch 1, the partition 9 moves towards the side of the negative pressure cavity 8b under the action of the pressure difference, the micro switch is closed, the wind pressure switch 1 is closed, a gas valve is opened, gas enters a combustion chamber of the gas wall-mounted stove to start combustion, and the gas wall-mounted stove; in this stage, the high-temperature flue gas generated by combustion will flow through the pressure measuring device 2 in the direction indicated by the arrow in the figure, and part of the high-temperature flue gas will flow into the positive-pressure chamber 8a via the positive-pressure pipe 3a.

High-temperature flue gas generated by combustion in the gas wall-mounted boiler generally contains a large amount of water vapor, and when the high-temperature flue gas flows into the positive pressure pipe 3a through the positive pressure taking port 2a of the pressure taking device 2, because the pipe wall temperature of the positive pressure pipe 3a is relatively low, the water vapor in the high-temperature flue gas forms condensed water when meeting cold, the positive pressure pipe 3a is blocked, and the wind pressure switch assembly cannot normally work.

To this problem, the utility model discloses a modified wind pressure switch subassembly, it can prevent that the high temperature flue gas from flowing into in the connecting pipe, and then prevents that the vapor in the high temperature flue gas from forming the comdenstion water in the connecting pipe.

As shown in fig. 3, the wind pressure switch assembly according to the embodiment of the present invention includes a wind pressure switch 31, a pressure taking device 32 and a connecting pipe 33. The wind pressure switch 31 includes a first detection port 31a and a second detection port 31b which communicate with a first detection chamber 38a and a second detection chamber 38b of the wind pressure switch 31, respectively, the first detection chamber 38a and the second detection chamber 38b being separated by a partition 39. The pressure taking device 32 includes a first pressure taking port 32a and a second pressure taking port 32b. The connection pipe 33 includes a first connection pipe 33a and a second connection pipe 33b, one end of the first connection pipe 33a is connected to the first detection port 31a, and the other end thereof is connected to the first pressure taking port 32a, and one end of the second connection pipe 33b is connected to the second detection port 31b, and the other end thereof is connected to the second pressure taking port 32b. The pressure taking device 32 is configured such that the gas pressures at the first pressure taking port 32a and the second pressure taking port 32b are both negative pressures and are different from each other when the high temperature flue gas flow passes through the pressure taking device 32.

From this, according to the utility model discloses wind pressure switch subassembly's working process as follows: when the blower is not started, the air pressures at the first pressure taking port 32a and the second pressure taking port 2b of the pressure taking device 32 are both atmospheric pressure, which is equal to the air pressures in the first detection chamber 38a and the second detection chamber 38b of the wind pressure switch 31, so that no gas exchange occurs between the wind pressure switch 31 and the pressure taking device 32, no pressure difference exists between the two sides of the partition 39 of the wind pressure switch 31, and the off state is maintained; when the fan is started at a certain speed, the air flow flows through the pressure taking device 32, which causes the air pressures at the first pressure taking port 32a and the second pressure taking port 32b to decrease to negative pressures different from each other, the air in the first detection chamber 38a and the second detection chamber 38b of the air pressure switch 31 flows into the pressure taking device 32 through the first connecting pipe 33a and the second connecting pipe 33b, and the volumes of the air flowing out of the first detection chamber 38a and the second detection chamber 38b are different, so that a pressure difference is formed across the partition 39, the partition 39 moves toward the second detection chamber 38b under the action of the pressure difference, the microswitch is closed, the air pressure switch 31 is closed, which causes the gas valve to open, the gas enters the combustion chamber of the gas wall-hanging stove to start to burn, and the gas wall-hanging stove enters a continuous operation stage. In this stage, the gas stream passing through the pressure extraction device 32 is the high temperature flue gas stream resulting from combustion. Since the air pressure at the two

pressure taking ports

32a,32b of the pressure taking device 32 is negative pressure, the high-temperature flue gas flowing through the pressure taking device 32 does not flow into the connecting pipe 33 through the negative

pressure taking ports

32a,32b, thereby avoiding the problem of forming condensed water in the connecting pipe 33.

According to a preferred embodiment of the present invention, the pressure taking device 32 may be formed by two venturi tubes having different sizes. The venturi typically includes an inlet section, a converging section, a throat, and a diverging section. The high temperature flue gas flows into the venturi tube through the inlet section, and the flow velocity thereof gradually increases in the contraction section and reaches a maximum at the throat, and then gradually decreases in the diffusion section. Thus, according to Bernoulli's theorem, the static pressure of the hot flue gas gradually decreases in the constriction and reaches a minimum at the throat. Therefore, in an embodiment according to the present invention, the first pressure taking port 32a and the second pressure taking port 32b are disposed at the throat of the two venturi tubes and perpendicular to the flow direction of the high temperature flue gas, so as to sample the static pressure of the high temperature flue gas at the throat. By sizing the convergent, throat and divergent sections of the venturi, the static pressures at the throats of the two venturis can be set to be different from each other. In addition, the Venturi tube has the advantages of wide measuring range, convenience in installation, high precision, convenience in maintenance and the like.

According to the utility model discloses a preferred embodiment, two venturi can integrated into one piece to promote the processing convenience.

According to the preferred embodiment of the present invention, the pressure measuring device 32 is made of a high temperature resistant and corrosion resistant stainless steel material to be suitable for use in a high temperature flue gas environment.

According to the preferred embodiment of the present invention, the first connection pipe 33a and the second connection pipe 33b are hoses, so that the installation position of the wind pressure switch 31 in the housing 4 of the gas wall hanging stove can be flexibly selected as required. Further, the first and

second connection pipes

33a and 33b may be made of silicon rubber.

According to the utility model discloses a preferred embodiment, connecting pipe 33 with wind pressure switch 31 with get pressure equipment 32 sealing connection to guarantee wind pressure switch assembly's gas tightness, thereby improve this wind pressure switch assembly's detection accuracy.

According to the preferred embodiment of the present invention, the first and

second detection ports

31a and 31b of the wind pressure switch 31 are provided to face downward to prevent foreign matters from affecting the normal use of the wind pressure switch 31 through the connection pipe 33 into the wind pressure switch 31.

The utility model also discloses a gas hanging stove including above-mentioned wind pressure switch subassembly, wherein, wind pressure switch 31 with get pressure equipment 32 fixed mounting respectively in the casing and the exhaust passage of gas hanging stove. When the unexpected stall of fan, rotational speed reduce or advance the exhaust passage and block up and lead to the displacement not enough or can't exhaust, according to the utility model discloses a wind pressure switch subassembly can in time accurately detect above-mentioned condition to be favorable to promoting the safety in utilization of gas hanging stove. Meanwhile, the pressure taking points of the pressure taking device 32 are set as negative pressure taking points, so that condensed water is prevented from being generated in the connecting pipe 33, and the probability of false alarm of the gas wall-hanging furnace is reduced.

According to the utility model discloses a preferred embodiment, the casing of gas hanging stove includes the wind pressure switch mount pad, wind pressure switch 31 is installed through snap-fit on the wind pressure switch mount pad. Thus, the installation process of the wind pressure switch can be simplified.

It should be noted that the terms "first", "second", and the like in the description and the claims of the present invention are used for distinguishing similar objects, and are not used for describing a specific order or sequence. It is to be understood that objects referred to as "first" or "second", etc., are interchangeable under appropriate circumstances.

Although specific embodiments of the present invention have been disclosed, those skilled in the art will appreciate that various modifications, substitutions and changes may be made without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention is not limited to the specific embodiments described above, but is only limited by the appended claims.

Claims

1. A wind pressure switch assembly, comprising:

a wind pressure switch (31), the wind pressure switch (31) comprising a first detection port (31a) and a second detection port (31b) which communicate with a first detection chamber (38a) and a second detection chamber (38b) of the wind pressure switch (31), respectively, the first detection chamber (38a) and the second detection chamber (38b) being separated by a partition (39);

a pressure taking device (32), the pressure taking device (32) comprising a first pressure taking port (32a) and a second pressure taking port (32 b); and

a connection pipe (33), the connection pipe (33) including a first connection pipe (33a) and a second connection pipe (33b), one end of the first connection pipe (33a) being connected to the first detection port (31a) and the other end being connected to the first pressure taking port (32a), and one end of the second connection pipe (33b) being connected to the second detection port (31b) and the other end being connected to the second pressure taking port (32 b);

characterized in that the pressure taking device (32) is configured such that the air pressures at the first pressure taking port (32a) and the second pressure taking port (32b) are both negative pressures and different from each other when the air flow passes through the pressure taking device (32).

2. The wind pressure switch assembly according to claim 1, wherein: the pressure measuring device (32) is formed by two Venturi tubes, the two Venturi tubes are respectively provided with an inlet section, a contraction section, a throat and a diffusion section, and the first pressure measuring port (32a) and the second pressure measuring port (32b) are arranged at the throats of the two Venturi tubes and are vertical to the flowing direction of the airflow.

3. The wind pressure switch assembly according to claim 2, wherein: the throat of the two venturis is of different size.

4. The wind pressure switch assembly according to claim 2, wherein: the two venturi tubes are integrally formed.

5. The wind pressure switch assembly according to claim 1, wherein: the pressure measuring device (32) is made of stainless steel materials, the first connecting pipe (33a) and the second connecting pipe (33b) are hoses, and the first connecting pipe (33a) and the second connecting pipe (33b) are made of silicon rubber.

6. The wind pressure switch assembly according to claim 1, wherein: the separator (39) is a film, and a microswitch is provided on the separator (39).

7. The wind pressure switch assembly according to claim 1, wherein: the connecting pipe (33) is connected with the wind pressure switch (31) and the pressure taking device (32) in a sealing mode.

8. The wind pressure switch assembly according to claim 1, wherein: the first detection port (31a) and the second detection port (31b) of the wind pressure switch (31) are provided to face downward.

9. A gas wall hanging stove comprising the wind pressure switch assembly according to any one of claims 1 to 8, wherein the wind pressure switch (31) and the pressure taking device (32) are fixedly installed in a housing and an exhaust passage of the gas wall hanging stove, respectively.

10. The gas wall hanging stove according to claim 9, characterized in that the housing of the gas wall hanging stove comprises a wind pressure switch mounting seat on which the wind pressure switch (31) is mounted by snap fit.