Explosion-proof pressure guiding structure of wind speed transmitter

Abstract

The utility model discloses an explosion-proof pressure guiding structure of a wind speed transmitter, which comprises a transmitter main body and a pressure guiding structure which are matched with each other, the pressure guiding structure comprises a connector, a breathable fire insulation block and an air tap, the connector is provided with a containing cavity, a first threaded hole and a second threaded hole, and the first threaded hole and the second threaded hole are communicated with the containing cavity. The breathable fire insulation block is contained in the containing cavity, and a fire insulation breathable area is defined by the breathable fire insulation block and the containing cavity. According to the utility model, the ventilating fire insulation block with the micropores is designed in the accommodating cavity in the connecting joint, even if sparks exist in the transmitter main body, the sparks can be isolated through the ventilating fire insulation block, and the sparks are prevented from being conducted into equipment to be detected, so that the safety during the detection of flammable and explosive gases is improved; and meanwhile, the added waterproof breathable film can play a waterproof role while guaranteeing a breathable effect, so that water vapor is prevented from entering the transmitter main body to influence the measurement accuracy and the service life of the transmitter main body.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind speed transmitters, in particular to an explosion-proof pressure-inducing structure of a wind speed transmitter. Background Art

[0002] With the rapid development of industrial automation, people's requirements for wind speed and air volume measurement are also increasing. Wind speed transmitters with good repeatability, good linearity, high reliability, and simple installation and maintenance are the future development trend. At present, wind speed transmitters generally use differential pressure transmitters, which use the two pressure-inducing structures of the differential pressure transmitter to connect the high-pressure part and the low-pressure part of the measured equipment, and the pressure-inducing structure introduces the gas into the differential pressure transmitter for measurement.

[0003] At present, the pressure-leading structure of differential pressure transmitters is generally a threaded (connecting) joint with a hollow hole. Since differential pressure transmitters are often used to measure the flow of flammable and explosive gases, when an abnormality (such as a short circuit) occurs inside the differential pressure transmitter and electric sparks or flames appear, since the threaded joint is directly connected to the measured device, the electric sparks or flames can easily enter the measured device through the hollow hole and cause a fire or even an explosion. Secondly, when the measured gas contains water vapor, the water vapor can also easily enter the transmitter through the hollow hole. The water vapor accumulated for a long time will affect the measurement accuracy and service life of the transmitter.

[0004] In view of this, an explosion-proof pressure-inducing structure for a wind speed transmitter is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide an explosion-proof pressure-inducing structure for a wind speed transmitter in order to solve the above-mentioned problems.

[0006] The technical solution adopted by the utility model is as follows: an explosion-proof pressure-inducing structure of a wind speed transmitter, comprising: a transmitter body and a pressure-inducing structure assembled with each other, the pressure-inducing structure comprising a connecting joint, a breathable fire-proof block and a gas nozzle, wherein: the connecting joint is provided with a accommodating cavity and a first threaded hole and a second threaded hole connected to the accommodating cavity, the breathable fire-proof block is accommodated in the accommodating cavity and enclosed therewith to form a fire-proof and breathable area, and a breathable waterproof film is also bonded to the end face of the breathable fire-proof block facing the second threaded hole.

[0007] In a preferred embodiment, the air-permeable fire-proof block is made of sintered stainless steel powder, has air-permeable micropores, and has the same shape and size as the accommodating cavity.

[0008] In a preferred embodiment, the breathable waterproof membrane is made of e-PTFE material, and the breathable waterproof membrane and the end surface of the breathable fire isolation block have the same shape and size.

[0009] In a preferred embodiment, there are two pressure-inducing structures, which are respectively arranged at the high-pressure interface and the low-pressure interface of the transmitter body.

[0010] In a preferred embodiment, the gas nozzle is threadedly installed in the second threaded hole, the gas nozzle has a hollow hole, the outer end of the gas nozzle extends to form a nozzle connected to the hollow hole, and the inner ends of the high-pressure interface and the low-pressure interface of the transmitter body are provided with a cavity to accommodate the insertion of the nozzle.

[0011] In a preferred embodiment, the outer end surface of the connecting joint is provided with an external thread, and the high-pressure interface and the low-pressure interface of the transmitter body are provided with internal threads that are compatible with the external thread.

[0012] In a preferred embodiment, a prismatic tube is further provided on the exterior of the end surface of the connecting joint facing the first threaded hole.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0014] 1. In the utility model, a breathable fire-block with micropores is designed in the accommodating cavity in the connecting joint. Even if there is a spark in the transmitter body, the breathable fire-block can isolate the spark and prevent the spark from being transmitted to the pressure measuring device, so as to improve the safety of detecting flammable and explosive gases;

[0015] 2. In the utility model, the added waterproof breathable membrane can not only ensure the ventilation effect but also play a waterproof role, preventing water vapor from entering the transmitter body and affecting the measurement accuracy and service life of the transmitter body;

[0016] 3. In the utility model, the positions of the breathable fireproof block and the waterproof breathable membrane are positioned with the aid of an air nozzle. After long-term use, the breathable fireproof block and the waterproof breathable membrane can be replaced separately, which can save the overall replacement cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the combination of the pressure-inducing structure and the transmitter body in the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-sectional plan structure of the pressure-inducing structure in the utility model;

[0019] Figure 3 It is a schematic diagram of the cross-sectional plan structure of the connecting joint in the utility model.

[0020] Markings in the figure: 1-pressure-leading structure, 11-connecting joint, 111-second threaded hole, 112-first threaded hole, 113-prismatic tube, 114-external thread, 115-accommodating chamber, 12-gas nozzle, 13-breathable waterproof membrane, 14-breathable fire isolation block, 2-transmitter body. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] Reference Figure 1-3 , an explosion-proof pressure-inducing structure of a wind speed transmitter, comprising: a transmitter body 2 and a pressure-inducing structure 1 assembled with each other, the pressure-inducing structure 1 comprising a connecting joint 11, a breathable fire-isolating block 14 and a gas nozzle 12, wherein: the connecting joint 11 is provided with a receiving cavity 115 and a first threaded hole 112 and a second threaded hole 111 connected to the receiving cavity 115, the breathable fire-isolating block 14 is made of sintered stainless steel powder, the breathable fire-isolating block 14 has breathable micropores and the shape and size of the breathable fire-isolating block 14 and the receiving cavity 115 are the same, the breathable fire-isolating block 14 is accommodated in the receiving cavity 115 and surrounded with the receiving cavity 115 to form a fire-proof and breathable area, a breathable fire-isolating block 14 with micropores is designed in the receiving cavity 115 in the connecting joint 11, even if there is a spark in the transmitter body 2, the spark can be isolated by the breathable fire-isolating block 14 to prevent the spark from being transmitted to the pressure measuring device (not shown in the figure), so as to improve the safety when detecting flammable and explosive gases.

[0023] At the same time, the micropores of the air-permeable fire-isolating block 14 will not affect the passage of gas, and can also isolate sparks while meeting the measurement requirements.

[0024] Furthermore, a breathable waterproof membrane 13 is bonded to the end face of the breathable fire isolation block 14 facing the second threaded hole 111. The breathable waterproof membrane 13 is made of e-PTFE material. The breathable waterproof membrane 13 and the end face of the breathable fire isolation block 14 have the same shape and size. The added waterproof breathable membrane 14 can ensure the breathability while also playing a waterproof role, so that the protection level of the transmitter can reach IP66, thereby preventing water vapor from entering the transmitter body 2 and affecting the measurement accuracy and service life of the transmitter body 2.

[0025] Furthermore, there are two pressure-leading structures 1, which are respectively arranged at the high-pressure interface and the low-pressure interface of the transmitter body 2. Pressure-sensitive elements (not shown in the figure) are arranged on the opposite sides of the high-pressure interface and the low-pressure interface in the transmitter body 2. In this embodiment, only the pressure-leading structure of the differential pressure transmitter is improved. Since the differential pressure transmitter is an existing technology, it will not be elaborated in detail here.

[0026] Furthermore, the gas nozzle 12 is threadedly installed in the second threaded hole 111, and the gas nozzle 12 has a hollow hole. The outer end of the gas nozzle 12 extends to form a nozzle 121 connected to the hollow hole. The inner ends of the high-pressure interface and the low-pressure interface of the transmitter body 2 are provided with cavities for the nozzle 121 to extend into. The other end of the gas nozzle 12 is in contact with the breathable waterproof membrane 13, which is used to limit the installation position of the breathable fire isolation block 14 and the waterproof breathable membrane 13. Since the nozzle 121 and the connecting joint 11 are threadedly connected, after long-term use, the nozzle 121 can be unscrewed to replace the breathable fire isolation block 14 and the waterproof breathable membrane 13 separately, which can save the overall replacement cost. The hollow hole can also meet the requirements of introducing gas into the measuring chamber of the transmitter body 2.

[0027] Furthermore, a prismatic tube 113 is provided on the outside of the end surface of the connection joint 11 facing the first threaded hole 112 , and can be threadedly connected to the measured device through the first threaded hole 112 .

[0028] Furthermore, an external thread 114 is provided on the outer end face of the connecting joint 11, and an internal thread matching the external thread 114 is provided at the high-pressure interface and the low-pressure interface of the transmitter body 2. Through the cooperation of the internal thread and the external thread 114, the connecting joint 11 can be threadedly installed on the transmitter body 2, and a sealing ring can be added at the connection between the internal thread and the external thread 114 to improve the sealing of the connection.

[0029] It should be mentioned that the connecting joint 11 and the nozzle 121 are preferably made of stainless steel, but this is not limited here.

[0030] To summarize, a breathable fire-proof block 14 with micropores is designed in the accommodating cavity 115 in the connecting joint 11. Even if there is a spark in the transmitter body 2, the spark can be isolated by the breathable fire-proof block 14 to prevent the spark from being transmitted to the pressure measured equipment, so as to improve the safety during the detection of flammable and explosive gases. At the same time, the added waterproof and breathable membrane 13 can ensure the breathability while also playing a waterproof role, preventing water vapor from entering the transmitter body 2 and affecting the measurement accuracy and service life of the transmitter body 2. It has advantages that the current wind speed differential pressure transmitter does not have.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof pressure-inducing structure for a wind speed transmitter, characterized in that: include: The transmitter body and the pressure-inducing structure assembled with each other, the pressure-inducing structure includes a connecting joint, a breathable fire-block and a gas nozzle, wherein: The connecting joint is provided with a accommodating cavity and a first threaded hole and a second threaded hole connected to the accommodating cavity. The breathable fire isolation block is accommodated in the accommodating cavity and encloses the accommodating cavity to form a fire-proof and breathable area. A breathable waterproof membrane is also bonded to the end face of the breathable fire isolation block facing the second threaded hole.

2. The explosion-proof pressure-inducing structure of the wind speed transmitter according to claim 1, characterized in that: The air-permeable fire-isolating block is made of sintered stainless steel powder, has air-permeable micropores, and has the same shape and size as the accommodating cavity.

3. The explosion-proof pressure-inducing structure of the wind speed transmitter according to claim 1, characterized in that: The breathable waterproof membrane is made of e-PTFE material, and the breathable waterproof membrane and the end face of the breathable fire isolation block have the same shape and size.

4. The explosion-proof pressure-inducing structure of the wind speed transmitter according to claim 1, characterized in that: There are two pressure-inducing structures, which are respectively arranged at the high-pressure interface and the low-pressure interface of the transmitter body.

5. The explosion-proof pressure-inducing structure of the wind speed transmitter according to claim 4, characterized in that: The air nozzle is threadedly installed in the second threaded hole. The air nozzle has a hollow hole. The outer end of the air nozzle extends to form a nozzle connected to the hollow hole. The inner ends of the high-pressure interface and the low-pressure interface of the transmitter body are both provided with cavities to accommodate the nozzle.

6. The explosion-proof pressure-inducing structure of the wind speed transmitter according to claim 4, characterized in that: The outer end surface of the connecting joint is provided with an external thread, and the high-pressure interface and the low-pressure interface of the transmitter body are provided with an internal thread that matches the external thread.

7. The explosion-proof pressure-inducing structure of the wind speed transmitter according to claim 1, characterized in that: A prismatic cylinder is also provided outside the end surface of the connecting joint facing the first threaded hole.

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