Pneumatic connection valve device

Abstract

The application discloses a kind of pneumatic connection valve devices, including valve body, pitot tube device, back flushing device, sensor, valve body is equipped with at least one group of valve core, at least one group of three-way pipe, valve core is respectively arranged in three-way pipe;Three-way pipe includes valve core insertion port, pitot tube device connection port, back flushing device connection port respectively, straight pipe is arranged between valve core insertion port and back flushing device connection port, pitot tube device connection port is equipped with vertical pipe and straight pipe intercommunication;Valve core includes upper piston, lower piston respectively, upper piston includes piston head, piston rod, piston head outer end surface is equipped with the sensor air hole extending to piston rod, piston rod side is equipped with the aeration air hole being communicated with sensor air hole, straight pipe is equipped with limit step near valve core insertion port, compression spring is arranged between lower piston and limit step.The application integrates valve body, pipeline, without coil, can realize control back flushing device to blow pitot tube, is suitable for use in explosion-proof environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pneumatic valve, in particular to a pneumatic connection valve device. BACKGROUND

[0002] Pitot tube is often used in industrial process to measure gas flow rate, flow and other parameters, and the pitot tube may be blocked during measurement, which affects the accuracy of measurement data, so it is necessary to reverse blow the pitot tube to blow out dust and other impurities.

[0003] The existing pitot tube reverse scanning device is generally composed of multiple electromagnetic valves, which has large volume, more pipelines, complex control, and the electromagnetic valve contains a coil, which needs to increase many explosion-proof measures in the explosion-proof environment, and even cannot be used. SUMMARY

[0004] The present application is to solve the problem of complex structure and inconvenient control of the existing pitot tube reverse scanning device, and provides a valve body composed of a special structure of pneumatic structure, which integrates the valve body and the pipeline, and can realize the control of the reverse blowing device blowing the pitot tube without a coil, so that the pneumatic connection valve device is suitable for use in explosion-proof environment.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A kind of pneumatic connection valve device, including valve body, pitot tube device, backflushing device, sensor, the valve body is equipped with at least one set of valve core, at least one set of three-way pipe, the valve core is located in three-way pipe;The three-way pipe includes valve core insertion port, pitot tube device connection port, backflushing device connection port, the valve core insertion port is equipped with straight pipe between backflushing device connection port, the pitot tube device connection port is equipped with vertical pipe and straight pipe intercommunication;The valve core includes upper piston, lower piston respectively, the upper piston includes piston head, piston rod, the piston head outer end surface is equipped with the sensor air hole extending to piston rod, the piston rod side is equipped with the aeration air hole with sensor air hole intercommunication, the straight pipe is equipped with limit step near valve core insertion port, the limit step middle part is equipped with the piston hole that can contain piston rod insertion, the piston rod insertion straight pipe one end is fixedly connected with lower piston, the lower piston is equipped with inner sealing ring between straight pipe side wall, the lower piston is equipped with compression spring between limit step;The compression spring is original state when backflushing device has no air flow pressure, the lower piston is located between backflushing device connection port, vertical pipe and straight pipe intercommunication port, the lower piston blocks the intercommunication between backflushing device connection port, pitot tube device connection port, the aeration air hole is located in straight pipe, the piston head is tightly attached to valve body and seals valve core insertion port, the pitot tube device connection port is interconnected with aeration air hole, sensor air hole, the pitot tube device is sent to two sets of sensor air;The compression spring is compressed state when backflushing device has air flow pressure, the lower piston is located between vertical pipe and straight pipe intercommunication port, limit step piston hole, backflushing device connection port and pitot tube device connection port are interconnected, the lower piston blocks the intercommunication of backflushing device connection port and aeration air hole, the intercommunication of pitot tube device connection port and aeration air hole, the backflushing device is sent to pitot tube device, the aeration air hole is located in valve body and is interconnected with atmosphere.

[0007] When the aeration air hole is located in valve body and is interconnected with atmosphere, the sensor can be adjusted to zero.

[0008] As the preferred scheme of the application, the three-way pipe is equipped with more than two groups, each group of three-way pipe is separated and is equipped with valve core, and the backflushing device connection ports of more than two groups of three-way pipes are connected in parallel with the backflushing device.The parallel structure can make more than two groups of sensors produce linkage, and synchronously lift or fall, and multiple sensors can be adjusted to zero at the same time.

[0009] As the preferred scheme of the application, the valve core insertion port is a tapered hole, the bottom of the piston head is equipped with a conical platform matched with the tapered hole, the outer side of the valve core insertion port is equipped with a second sealing ring on the valve body end face, and the second sealing ring is matched with the piston head.

[0010] As a preferred scheme of the present application, a third sealing ring is arranged on the valve body end face outside the blowback device connecting port.

[0011] As a preferred scheme of the present application, a groove is arranged at the bottom of the lower piston, and the lower piston is threadedly connected with the piston rod. The groove is used for facilitating the use of a screwdriver during the thread connection.

[0012] As a preferred scheme of the present application, a linkage rod is arranged between the valve cores, and the linkage rod passes through and is connected with the piston heads. One piston head corresponds to one three-way pipe, and is respectively connected with a sensor. The blowback device generally does not simultaneously communicate with multiple three-way pipes for pressurization. In the present scheme, after one piston head is lifted by the pressurization of the blowback device, the linkage rod can drive other piston heads to be simultaneously lifted, so that the connected sensors can be simultaneously adjusted to zero. The linkage rod can be one rod (passing through the middle of the piston head) or two rods (passing through the two sides of the piston head).

[0013] As a preferred scheme of the present application, the inner sealing ring includes a first inner sealing ring and a second inner sealing ring. The first inner sealing ring is arranged in the straight pipe close to the limiting step, and the second inner sealing ring is arranged in the straight pipe close to the blowback device connecting port. The upper end and the lower end of the lower piston are respectively arranged in cooperation with the first inner sealing ring and the second inner sealing ring. In the present scheme, two inner sealing rings are arranged and fixed. When the valve core insertion port communicates with the pitot tube device connecting port, the lower end of the lower piston tightly presses the second inner sealing ring. When the pitot tube device connecting port communicates with the blowback device connecting port, the upper end of the lower piston tightly presses the first inner sealing ring. In this way, the sealing rings can be prevented from being damaged due to friction with the straight pipe wall when the lower piston moves up and down.

[0014] As a preferred scheme of the present application, the lower piston includes a piston body, a sealing cover and a sealing spring. The piston body is fixedly connected with the upper piston. The sealing cover is sleeved outside the piston body and is connected with the piston body through the sealing spring. The upper end and the lower end of the sealing cover or the piston body are respectively arranged in cooperation with the first inner sealing ring and the second inner sealing ring. In the present scheme, the sealing spring mainly extends the lower piston to reduce the machining precision requirement. The sealing cover or the piston body can be tightly pressed with the first inner sealing ring and the second inner sealing ring to achieve sealing.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The present application integrates the valve body and the pipeline, and can control the blowback device to blow the pitot tube without a coil. Without the coil, the present application is suitable for use in an explosion-proof environment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structural schematic diagram of the present application.

[0018] Figure 2 A sectional structural schematic diagram of the present application when the valve core insertion port communicates with the pitot tube device connection port.

[0019] Figure 3 A sectional structural schematic diagram of the present application when the pitot tube device connection port communicates with the blowback device connection port.

[0020] Figure 4 A structural schematic diagram of the present application with linkage rods.

[0021] Figure 5 A second sectional structural schematic diagram of the present application when the valve core insertion port communicates with the pitot tube device connection port.

[0022] Figure 6 A second sectional structural schematic diagram of the present application when the pitot tube device connection port communicates with the blowback device connection port.

[0023] Figure 7 A third sectional structural schematic diagram of the present application when the valve core insertion port communicates with the pitot tube device connection port.

[0024] Figure 8 A third sectional structural schematic diagram of the present application when the pitot tube device connection port communicates with the blowback device connection port.

[0025] In the figure: 1, valve body 2, valve core 3, three-way pipe 4, compression spring

[0026] 5, second sealing ring 6, third sealing ring 21, upper piston

[0027] 22, lower piston 23, piston head 24, piston rod 25, sensor air hole

[0028] 26, ventilation air hole 27, first sealing ring 28, linkage rod

[0029] 31, valve core insertion port 32, pitot tube device connection port 33, blowback device connection port

[0030] 34, straight pipe 35, vertical pipe 36, limiting step

[0031] 221, piston body 222, sealing cover 223, sealing spring

[0032] 271, first inner sealing ring 272, second inner sealing ring. DETAILED DESCRIPTION

[0033] For the purpose of promoting the understanding of the present application, the present application will be more fully described by referring to the attached drawings, wherein several embodiments of the present application are shown. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0034] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein, the terms "vertical", "horizontal", "left", "right" and the like are merely used for the purpose of illustration and description and are not intended to limit the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0036] Referring to Figures 1-3 The present application provides a technical solution:

[0037] The pneumatic connection valve device comprises a valve body 1, a pitot tube device, a back flushing device, two groups of sensors, the valve body 1 is provided with a valve core 2 and a three-way pipe 3, the valve core 2 is arranged in the two groups of three-way pipes 3; the three-way pipe 3 comprises a valve core insertion port 31, a pitot tube device connection port 32 and a back flushing device connection port 33, a straight pipe 34 is arranged between the valve core insertion port 31 and the back flushing device connection port 33, the pitot tube device connection port 32 is provided with a vertical pipe 35 which is in communication with the straight pipe 34; the two groups of valve cores 2 respectively comprise an upper piston 21 and a lower piston 22, the upper piston 21 comprises a piston head 23 and a piston rod 24, a sensor air hole 25 extending to the piston rod 24 is arranged on the outer end surface of the piston head 23, an air hole 26 in communication with the sensor air hole 25 is arranged on the side surface of the piston rod 24, a limiting step 36 is arranged at the position close to the valve core insertion port 31 of the straight pipe 34, a piston hole capable of accommodating the piston rod 24 is arranged in the middle of the limiting step 36, one end of the piston rod 24 inserted into the straight pipe 34 is fixedly connected with the lower piston 22, the lower piston 22 is attached to the side wall of the straight pipe 34 and is provided with an inner sealing ring 27, and a compression spring 4 is arranged between the lower piston 22 and the limiting step 36.

[0038] The three-way pipe 3 is provided with two groups, each group of three-way pipes 3 is separated from each other and is respectively provided with a valve core 2, and the back flushing device connection ports 33 of the two groups of three-way pipes 3 are connected in parallel and are in communication with the back flushing device.

[0039] The valve core insertion port 31 is a tapered hole, and the bottom of the piston head 23 is provided with a cone that mates with the tapered hole. A second sealing ring 5 is provided on the end face of the valve body 1 outside the valve core insertion port 31, and the second sealing ring 5 is configured to mate with the piston head 23.

[0040] A third sealing ring 6 is provided on the outer end face of the valve body 1 at the connection port 33 of the backflush device.

[0041] The bottom of the lower piston 22 is provided with a groove, and the lower piston 22 and the piston rod 24 are connected by threads.

[0042] like Figure 4 Two linkage rods 28 are provided between multiple valve cores 2. The linkage rods 28 pass through multiple piston heads 23 and are connected to the multiple piston heads 23.

[0043] like Figure 5 , Figure 6 As shown, the inner sealing ring 27 includes a first inner sealing ring 271 and a second inner sealing ring 272. The first inner sealing ring 271 is located inside the straight pipe 34 near the limiting step 36, and the second inner sealing ring 272 is located inside the straight pipe 34 near the backflush device connection port 33. The upper and lower ends of the lower piston 22 are respectively engaged with the first inner sealing ring 271 and the second inner sealing ring 272. The lower piston 22 includes a piston body 221, a sealing cover 222, and a sealing spring 223. The piston body 221 is fixedly connected to the upper piston 21. The sealing cover 222 is sleeved on the outside of the piston body 221 and connected to the piston body 221 by the sealing spring 223. The upper and lower ends of the sealing cover 222 are respectively engaged with the first inner sealing ring 271 and the second inner sealing ring 272.

[0044] Or such as Figure 7 , Figure 8 As shown, the basic structure and Figure 5 , Figure 6 The two systems are similar, but differ in that the lower end of the sealing cap 222 is fitted with the second inner sealing ring 272, and the upper end of the piston body 221 is fitted with the first inner sealing ring 271.

[0045] The working process of this invention is as follows: When there is no airflow pressure in the backflush device, the compression spring 4 is in its original state. The lower piston 22 is located between the backflush device connection port 33, the vertical pipe 35 and the straight pipe 34 connection port. The lower piston 22 blocks the connection between the backflush device connection port 33 and the Pitot tube device connection port 32. The vent 26 is located inside the straight pipe 34. The piston head 23 is close to the valve body 1 and seals the valve core insertion port 31. The Pitot tube device connection port 32 is connected to the vent 26 and the sensor vent 25. The Pitot tube device sends air to the two sets of sensors.

[0046] When there is airflow pressure in the backflush device, the compression spring 4 is in a compressed state. The lower piston 22 is located between the vertical pipe 35 and the straight pipe 34 connection port and the piston hole of the limiting step 36. The backflush device connection port 33 and the Pitot tube device connection port 32 are connected to each other. The lower piston 22 blocks the connection between the backflush device connection port 33 and the vent 26, and the connection between the Pitot tube device connection port 32 and the vent 26. The backflush device sends air to the Pitot tube device. The vent 26 is located outside the valve body 1 and is connected to the atmosphere.

[0047] After one piston head 23 is pressurized and lifted by the backflush device, due to the action of the linkage rod 28, it can drive other piston heads 23 to rise at the same time, so that the connected sensors can be zeroed and adjusted simultaneously.

[0048] When the sealing cap 222 and the sealing spring 223 move up and down with the lower piston 22 and contact the first inner sealing ring 271 and the second inner sealing ring 272, the sealing cap 222 or the piston body 221 respectively adheres tightly to the first inner sealing ring 271 and the second inner sealing ring 272 to achieve a sealing effect.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatically connected valve apparatus comprising a valve body, a pitot tube apparatus, a backflushing apparatus, a sensor, characterised in that: The valve body is provided with at least one set of valve cores and at least one set of three-way pipes, the valve core is arranged in the three-way pipe; The three-way pipe comprises a valve core insertion port, a pitot tube device connection port and a back flushing device connection port, a straight pipe is arranged between the valve core insertion port and the back flushing device connection port, and the pitot tube device connection port is provided with a vertical pipe in communication with the straight pipe; The valve core comprises an upper piston and a lower piston, the upper piston comprises a piston head and a piston rod, a sensor air hole extending to the piston rod is arranged on the outer end surface of the piston head, an air hole in communication with the sensor air hole is arranged on the side surface of the piston rod, a limiting step is arranged near the valve core insertion port of the straight pipe, a piston hole for accommodating the piston rod is arranged in the middle of the limiting step, one end of the piston rod inserted into the straight pipe is fixedly connected with the lower piston, an inner sealing ring is arranged between the lower piston and the side wall of the straight pipe, and a compression spring is arranged between the lower piston and the limiting step; When the back flushing device has no air flow pressure, the compression spring is in an original state, the lower piston is located between the back flushing device connection port and the communication port of the vertical pipe and the straight pipe, the lower piston blocks the communication between the back flushing device connection port and the pitot tube device connection port, the air hole is located in the straight pipe, the piston head tightly abuts against the valve body and seals the valve core insertion port, the pitot tube device connection port is in communication with the air hole and the sensor air hole, and the pitot tube device supplies air to two sets of sensors; When the back flushing device has air flow pressure, the compression spring is in a compressed state, the lower piston is located between the communication port of the vertical pipe and the straight pipe and the piston hole of the limiting step, the back flushing device connection port and the pitot tube device connection port are in communication with each other, the lower piston blocks the communication between the back flushing device connection port and the air hole and the communication between the pitot tube device connection port and the air hole, the back flushing device supplies air to the pitot tube device, and the air hole is located outside the valve body and in communication with the atmosphere.

2. A pneumatic connection valve arrangement according to claim 1, characterised in that: The three-way pipe is provided with two or more sets of three-way pipes, each set of three-way pipes is separated from each other and is respectively provided with a valve core, and the back flushing device connection ports of the two or more sets of three-way pipes are connected in parallel and in communication with the back flushing device.

3. A pneumatic connection valve arrangement according to claim 1, characterized in that: The valve core insertion port is a tapered hole, the bottom of the piston head is provided with a conical platform matched with the tapered hole, a second sealing ring is arranged on the outer side of the valve body end surface of the valve core insertion port, and the second sealing ring is matched with the piston head.

4. A pneumatic connection valve arrangement according to claim 1, characterized in that: A third sealing ring is arranged on the outer side of the valve body end surface of the back flushing device connection port.

5. A pneumatic connection valve device according to claim 1, characterized in that: The bottom of the lower piston is provided with a groove, and the lower piston and the piston rod are threadedly connected.

6. A pneumatic connection valve arrangement according to claim 2, characterised in that: Linkage rods are arranged between the valve cores, the linkage rods pass through and are connected with the piston heads.

7. A pneumatic connection valve device according to claim 1, characterized in that: The inner sealing ring comprises a first inner sealing ring and a second inner sealing ring, the first inner sealing ring is arranged in the straight pipe close to the limiting step, the second inner sealing ring is arranged in the straight pipe close to the back flushing device connection port, and the upper end and the lower end of the lower piston are respectively matched with the first inner sealing ring and the second inner sealing ring.

8. A pneumatic connection valve arrangement according to claim 7, characterised in that: The lower piston comprises a piston body, a sealing cover and a sealing spring, the piston body is fixedly connected with the upper piston, the sealing cover is sleeved outside the piston body and connected with the piston body through the sealing spring, and the upper end and the lower end of the sealing cover or the piston body are respectively matched with the first inner sealing ring and the second inner sealing ring.

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