Middle-high pressure sealing valve structure for blowing system

Abstract

The utility model discloses a middle-high pressure sealing valve structure for a blowing system, which comprises a blowing tank and a valve body fixed at an inlet of the blowing tank, the periphery of the top of the blowing tank is hermetically connected with the periphery of the bottom of the valve body, the valve body is provided with a first pipeline communicated with a feed port, the bottom of the valve body is provided with an opening leading to the inside of the blowing tank, and the opening is communicated with the inside of the blowing tank. An air cylinder is further arranged on the valve body and is in sealed connection with one end of a second pipeline, the other end of the second pipeline intersects and is communicated with the first pipeline where the feeding port is located, the telescopic end of the air cylinder is connected with an inverted-cone-shaped valve element through a pull rod, and the telescopic end of the air cylinder and the pull rod are both arranged in the second pipeline; the valve element and the opening in the bottom of the valve body are sealed or opened through stretching and retracting of the air cylinder. The valve is used on the upper portion of a blowing tank of a pneumatic ash conveying system and plays a role in discharging and sealing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of middle-high pressure sealing valve structure for injection system, belong to sealing valve field. BACKGROUND

[0002] Generally, pneumatic ash conveying system uses dome valve as the valve of discharging and sealing, as shown in Figures 4-7 Generally, the pressure of carrier gas is 3-6 kg, and for the injection system needing carrier gas pressure of 10-20 kg, dome valve cannot meet the above application scenarios because it uses a gas with higher pressure than carrier gas as sealing gas, so a sealing valve with simpler structure and better use effect needs to be developed. SUMMARY

[0003] The technical problem to be solved by the utility model is how to make the sealing valve meet the sealing of the injection system with carrier gas pressure of 10-20 kg and simplify its structure.

[0004] To solve the above technical problem, the technical scheme of the utility model provides a kind of middle-high pressure sealing valve structure for injection system, including injection tank and the valve body fixed at the inlet of injection tank, the periphery between the top of injection tank and the bottom periphery of valve body is sealedly connected, first pipeline that communicates feed inlet is equipped on valve body, the opening that leads to the inside of injection tank is equipped on the bottom of valve body, characterized in that, the valve body is also equipped with air cylinder, air cylinder is sealedly connected with one end of second pipeline, the other end of second pipeline is crossed and communicated with the first pipeline where feed inlet is located, the telescopic end of air cylinder is connected with the valve core of inverted cone shape through pull rod, and the telescopic end of air cylinder and pull rod are all arranged in second pipeline;Through the telescopic of air cylinder, the opening between valve core and the bottom of valve body is sealed or opened.

[0005] Preferably, the valve body is also equipped with third pipeline that communicates exhaust port, the first pipeline where feed inlet is located is crossed and connected with the lower end of third pipeline where exhaust port is located, and is communicated with the opening in the bottom of valve body.

[0006] Preferably, the injection tank includes injection tank body and injection tank end flange, and the injection tank end flange is fixed outside the inlet end of injection tank body, the valve body includes valve body and valve body flange, and the valve body flange is fixed outside the bottom of valve body, and the injection tank and the valve body are fastened and connected through injection tank end flange and valve body flange;The opening is arranged in the bottom of valve body, and the first pipeline is fixed on valve body.

[0007] Preferably, the inner wall of injection tank is sealedly connected with the bottom periphery of valve body, the bottom of valve body is stepped structure, part of steps is arranged in injection tank body, and the remaining part of steps is arranged on injection tank end flange.

[0008] Preferably, the bottom surface of valve core is larger than the size of the opening in the bottom of valve body.

[0009] Preferably, the valve core is arranged in the blowing tank body.

[0010] Preferably, the bottom of the valve body bottom opening is a sealing surface; when the cylinder retracting end retracts, the valve core is pulled, so that the tip conical surface of the valve core is in sealing connection with the sealing surface of the valve body bottom opening; when the cylinder retracting rod pushes towards the valve body bottom opening, the pull rod moves the valve core towards the blowing tank interior, so that a gap for exhausting and feeding is formed between the valve core and the valve body bottom opening.

[0011] Compared with the prior art, the utility model has at least one of the following advantages:

[0012] 1. Excellent sealing performance: the valve core of the utility model is inverted conical, the sealing surface fits more closely when the pressure in the valve body is greater, so it is particularly suitable for sealing of the blowing tank under medium-high pressure; the sealing structure with taper is specially designed, the contact area is large, the sealing is reliable, the sealing material of fluorine rubber is easy to obtain, and the service period is longer;

[0013] 2. Strong wear resistance: the material falls naturally by gravity, only contacts the pull rod and the conical valve core in the falling process, the pull rod and the valve core are plated with a hardening layer when the valve is made, the second pipeline length is reasonably designed through calculation, the pull rod is protected, and the service life of the valve is prolonged;

[0014] 3. Adapt to frequent operation: the structural design of the sealing valve enables quick opening and closing actions in a short time, and still maintains good working performance and sealing reliability in a long-term frequent operation process, and can meet the working condition requirements of pneumatic ash conveying systems and other high-frequency switching operations;

[0015] 4. No friction in opening and closing: there is no contact or little friction loss between the valve core and the sealing ring when the valve is opened and closed, the opening is free from jamming, the sealing surface can be ensured in the opening and closing process, and the service life of the valve is further prolonged;

[0016] 5. Full cross-section flow: when the valve is opened, the material port is full-flow without obstruction, which can effectively reduce the resistance in the material conveying process and improve the conveying efficiency;

[0017] 6. High reliability: simple structure, firm design, can adapt to other working environments that other valves cannot adapt to, can be stably operated for a long time, reduces equipment failure and maintenance frequency, and reduces maintenance cost;

[0018] 7. Reduce cost: the dome valve needs higher cost due to the complex structure, and higher cost (such as booster equipment) is needed for sealing, the utility model valve only needs about 20% of the cost of the dome valve, and does not consider the booster equipment;

[0019] 8. Wide application: suitable for the delivery control of various solid powder materials, and can be widely applied in the pneumatic delivery industry with high pressure requirement in electric power, metallurgy and other fields;

[0020] 9. High automation: pneumatic actuator can be conveniently equipped, and connected with automatic control equipment to realize remote control and automatic operation, and improve production efficiency and management level;

[0021] The valve is used on the upper part of the injection tank of the pneumatic ash delivery system, and plays a role of discharging and sealing. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a sectional view of the medium-high pressure sealing valve structure for the injection system (valve closed);

[0023] Figure 2 It is a sectional view of the medium-high pressure sealing valve structure for the injection system (valve opened);

[0024] Figure 3 It is a perspective view of the medium-high pressure sealing valve structure for the injection system;

[0025] Figure 4 It is a schematic view of the existing dome valve in the closed state;

[0026] Figure 5 It is a schematic view of the gas flow at the sealing ring inflation inlet when the existing dome valve is closed;

[0027] Figure 6 It is a schematic view of the existing dome valve in the opened state;

[0028] Figure 7 It is a schematic view of the gas flow at the sealing ring inflation inlet when the existing dome valve is opened. DETAILED DESCRIPTION

[0029] In order to make the utility model more obvious and easy to understand, the preferred embodiment is described in detail below with the help of the drawings.

[0030] The utility model provides a kind of medium-high pressure sealing valve structure for injection system, such as Figures 1-3As shown, it comprises a blowing tank 2 and a valve body 1 fixed at the inlet of the blowing tank 2, the blowing tank 2 comprises a blowing tank body 21 and a blowing tank end flange 22 fixed outside the inlet end of the blowing tank body 21, the valve body 1 comprises a valve body 16 and a valve body flange 17 fixed outside the bottom of the valve body 16, the blowing tank 2 and the valve body 1 are fastened and connected through the blowing tank end flange 22 and the valve body flange 17, and the blowing tank end flange 22 and the valve body flange 17 are fastened together through a plurality of bolts and nuts. The inner wall of the blowing tank 2 is sealingly connected with the periphery of the bottom of the valve body 1, the bottom of the valve body 16 is of a stepped structure, part of the steps is arranged in the blowing tank body 21, and the remaining steps are arranged on the blowing tank end flange 22.

[0031] The top of the valve body 16 is connected with three pipes (first pipe, second pipe and third pipe), the lower ends of the three pipes are cross-connected and lead into the blowing tank body 21, the top of the middle pipe (second pipe) is sealingly connected with the base of the cylinder 12, the telescopic end of the cylinder 12 is arranged in the middle pipe, the upper ends of the two side pipes (first pipe and third pipe) are respectively the exhaust port 11 and the feeding port 13, the telescopic end of the cylinder 12 is connected with the inverted conical valve core 15 through the pull rod 121, the bottom surface of the valve core 15 is larger than the size of the opening in the bottom of the valve body 16, and the valve core 15 is pulled by the retraction of the telescopic end of the cylinder 12, so that the tip conical surface of the valve core 15 is sealingly connected with the sealing surface 14 on the opening in the bottom of the valve body 16. Since the valve core 15 is arranged in the blowing tank body 21, when the bottom of the valve body 16 is sealed by the valve core 15, the valve core 15 is pressed by the gas pressure in the blowing tank body 21 and is pressed more tightly; when it is needed to open the valve formed by the valve core 15 and the opening in the bottom of the valve body 16, the cylinder 12 is started, the pull rod 121 pushes the valve core 15 towards the inside of the blowing tank body 21 through the pushing action of the telescopic rod of the cylinder 12, so that a gap is formed between the valve core 15 and the opening in the bottom of the valve body 16, and then the exhaust port 11 can exhaust and the feeding port 13 can feed the material into the blowing tank body 21.

[0032] The operation method of the utility model is as follows:

[0033] When it is needed to discharge, the gas in the blowing tank 2 is exhausted through the diffusion valve on the blowing tank 2, the valve is opened through the cylinder 12, the material falls into the lower blowing tank 2 along the conical valve core 15, when the material level meter and the weighing device detect that the material in the blowing tank 2 reaches the predetermined weight or material level, the valve core 15 is lifted to contact the sealing surface 14 through the lifting cylinder 12, so that the blowing tank is sealed. When it is needed to start blowing the material, the carrier gas starts to work, and the material conveying system can start to work when the predetermined pressure is reached.

Claims

1. A medium-high pressure seal valve structure for a blowing system, comprising a blowing tank (2) and a valve body (1) fixed at the inlet of the blowing tank (2), the top periphery of the blowing tank (2) being sealingly connected with the bottom periphery of the valve body (1), a first pipeline communicating with a feeding port (13) being arranged on the valve body (1), and an opening leading into the blowing tank (2) being arranged at the bottom of the valve body (1), characterized in that, The valve body (1) is further provided with a cylinder (12), the cylinder (12) is in sealing connection with one end of the second pipeline, the other end of the second pipeline is in communication with the first pipeline where the feed inlet (13) is located, the telescopic end of the cylinder (12) is connected with the inverted conical valve core (15) through a pull rod (121), and the telescopic end of the cylinder (12) and the pull rod (121) are arranged in the second pipeline; through the telescoping of the cylinder (12), the valve core (15) and the opening at the bottom of the valve body (1) are in sealing or opening.

2. A medium-high pressure seal valve structure for a blow molding system as defined in claim 1, wherein, The valve body (1) is further provided with a third pipeline in communication with the exhaust port (11), the first pipeline where the feed inlet (13) is located is cross-connected with the lower end of the third pipeline where the exhaust port (11) is located, and is in communication with the opening at the bottom of the valve body (1).

3. A medium-high pressure seal valve structure for a blow molding system as defined in claim 1, wherein, The blow tank (2) comprises a blow tank body (21) and a blow tank end flange (22), the blow tank end flange (22) is fixed outside the inlet end of the blow tank body (21), the valve body (1) comprises a valve body (16) and a valve flange (17), the valve flange (17) is fixed outside the bottom of the valve body (16), the blow tank (2) and the valve body (1) are tightly connected through the blow tank end flange (22) and the valve flange (17); the opening is arranged at the bottom of the valve body (16), and the first pipeline is fixed on the valve body (16).

4. A medium-high pressure seal valve structure for a blow molding system as defined in claim 1, wherein, The inner wall of the blow tank (2) is in sealing connection with the periphery of the bottom of the valve body (1), the bottom of the valve body (16) is in a stepped structure, part of the steps is arranged in the blow tank body (21), and the remaining steps are arranged on the blow tank end flange (22).

5. A medium-high pressure seal valve structure for a blow molding system as defined in claim 1, wherein, The bottom surface of the valve core (15) is larger than the size of the opening at the bottom of the valve body (16).

6. A medium-high pressure seal valve structure for a blow molding system as defined in claim 1, wherein, The valve core (15) is arranged in the blow tank body (21).

7. A medium-high pressure seal valve structure for a blow system according to claim 1, wherein The bottom of the opening at the bottom of the valve body (1) is a sealing surface (14); when the telescopic end of the cylinder (12) is retracted, the valve core (15) is pulled, so that the tapered surface at the tip of the valve core (15) is in sealing connection with the sealing surface (14) at the bottom of the opening of the valve body (1); when the telescopic rod of the cylinder (12) is pushed towards the opening at the bottom of the valve body (1), the pull rod (121) moves the valve core (15) towards the inside of the blow tank (2), so that the valve core (15) and the opening at the bottom of the valve body (1) form a gap for exhaust and feeding.

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