A one-way valve for use in a negative pressure pneumatic conveying system

Abstract

The utility model relates to one -way valve technical field, and disclose a one -way valve for negative pressure pneumatic conveying system, including conveying pipeline and one -way valve, one -way valve installs in the top of conveying pipeline. The one -way valve for negative pressure pneumatic conveying system, it can adapt to the vast majority of negative pressure pneumatic conveying condition, can effectively divide the big -size material plug in conveying pipeline, further avoid the material plug blockage and lead to the conveying failure, let the pressure sensor on the conveying pipeline not be the necessary option, thereby reduced the equipment construction cost, adopt pure mechanical structure, make its work more reliable, maintenance -free, can adapt to the more severe conveying condition, need not manual clearing, reduce the personal safety problem that brings because special working condition overhauling operation, when single failure can not influence the normal operation of other one -way valve, can accurate locking the silted part of conveying material pipe, further accurate'air -supply ', can save the overhauling cycle long that causes because conveying pipeline silted and the problem of influence production line production.

Description

Technical Field

[0001] This utility model relates to the field of one-way valve technology, specifically a one-way valve for a negative pressure pneumatic conveying system. Background Technology

[0002] Traditional negative pressure pneumatic conveying systems are mostly used to convey toxic, odorous, temperature-sensitive, or even flammable and explosive powdery materials. From the perspective of the conveying process, they can achieve multi-point feeding and high conveying cleanliness, and are widely used in actual industrial production.

[0003] In practical applications, material blockages frequently occur, forcing the system to shut down, which causes considerable inconvenience to production. To shorten the troubleshooting cycle after pipe blockage, for some long-distance conveying systems, a pressure sensor is installed at regular intervals along the conveying pipeline during system design. The pressure sensor feeds back the pressure signal from inside the pipe to the control system. The control system determines whether a blockage has occurred in that pipe section based on the pressure value. If a blockage is found, the system protection program is activated, causing the Roots vacuum pump to enter idle operation mode to prevent irreversible damage to the equipment on the system. Next, operators will locate the blockage section based on the pressure sensor signal and manually clear the blockage. This is time-consuming and labor-intensive, and for some toxic, harmful, flammable, or explosive materials, it may also pose a risk to the personal safety of the operators. Utility Model Content

[0004] The purpose of this invention is to provide a one-way valve for a negative pressure pneumatic conveying system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a one-way valve for a negative pressure pneumatic conveying system, comprising a conveying pipeline and a one-way valve, wherein the one-way valve is installed at the top of the conveying pipeline.

[0006] The one-way valve includes a valve body, a filter nozzle installed at the left end of the valve body, a sliding sleeve installed at one end of the valve body, a sleeve installed at the right end of the sliding sleeve, an adjusting screw inserted inside the sleeve, a spring connected to the left side surface of the adjusting screw, a valve stem inserted at the middle position of the sliding sleeve, a lock nut threaded to the left end of the valve stem, a flat washer connected to the right side surface of the lock nut, a sealing gasket connected to the right side surface of the flat washer, and a pressure plate connected to the surface of the sealing gasket. The filter nozzle serves as the inlet for external airflow into the pipeline during "air replenishment" to remove blockages, filtering the airflow and reducing airflow noise. A standard powder metallurgy copper silencer can be used as a substitute. The lock nut, flat washer, and pressure plate work together to fix the sealing gasket.

[0007] Preferably, the valve stem is inserted into the middle position of the pressure plate, the valve stem is inserted into the middle position of the sealing gasket, and the valve stem is inserted into the middle position of the flat washer.

[0008] Preferably, the delivery pipe is installed at the bottom of the valve body. The valve body, as one of the main structures of the one-way valve, serves as a carrier for supporting and connecting other parts, and also provides a channel for the flow of compressed air.

[0009] Preferably, the valve stem is located inside the spring, with one end of the valve stem connected to the sealing gasket and the pressure plate, and the other end in contact with the end face of the spring. When the pressure difference thrust formed inside and outside the delivery pipe is greater than the preset elastic force of the spring, one side of the spring slides, the one-way valve is opened, and the external airflow enters the delivery pipe; otherwise, it will remain in place.

[0010] Preferably, the adjusting screw is movably connected to one end of the spring. The adjusting screw is used to set the opening pressure of the one-way valve. The principle is to adjust the spring force by adjusting the screw screw insertion length, so that a certain force is formed between the sealing gasket and the valve body sealing ring.

[0011] Preferably, the sealing gasket is movably connected to the inner wall surface of the valve body, and the sealing gasket is a sealing ring structure inside the valve body to form a sealing structure, thereby blocking or opening the airflow passage between the delivery pipe and the outside.

[0012] Preferably, the valve stem is located inside the sleeve, which is used to fix the adjusting screw and to cooperate with the adjusting screw to form a sealing structure to prevent air leakage on this side.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This negative pressure pneumatic conveying system uses a one-way valve, which can adapt to most negative pressure pneumatic conveying conditions. It can effectively divide large-sized material plugs in the conveying pipeline, thereby avoiding material plug blockage and conveying failure.

[0014] This negative pressure pneumatic conveying system uses a check valve, eliminating the need for pressure sensors on the conveying pipeline, thereby reducing equipment construction costs.

[0015] This negative pressure pneumatic conveying system uses a one-way valve with a purely mechanical structure, making it more reliable and maintenance-free. It can adapt to relatively harsh conveying conditions, eliminates the need for manual unblocking, and reduces personal safety issues caused by maintenance work under special conditions.

[0016] This negative pressure pneumatic conveying system uses one-way valves, and the failure of one of them will not affect the normal operation of other one-way valves, thus exhibiting high robustness.

[0017] This negative pressure pneumatic conveying system uses a one-way valve to accurately locate the blockage in the conveying pipe, thereby precisely "replenishing air" and eliminating the problem of long maintenance cycles caused by blockage in the conveying pipeline, which affects production line operations.

[0018] This negative pressure pneumatic conveying system uses a one-way valve, which can protect the conveying system from systemic cascading failures when the conveying pipeline is blocked. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the entire utility model; Figure 2 This is a schematic diagram of the internal device of the one-way valve of this utility model; Figure 3 This utility model Figure 2 A magnified view of the structure at point A in the diagram; Figure 4 This is a schematic diagram of the conveying pipeline and the internal device of the one-way valve of this utility model.

[0020] In the diagram: 1. Delivery pipeline; 2. Check valve; 2-1. Filter nozzle; 2-2. Valve body; 2-3. Locking nut; 2-4. Flat washer; 2-5. Sealing gasket; 2-6. Pressure plate; 2-7. Valve stem; 2-8. Sliding sleeve; 2-9. Spring; 2-10. Adjusting screw; 2-11. Sleeve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 The present invention provides the following technical solution: A one-way valve for a negative pressure pneumatic conveying system includes a conveying pipeline 1 and a one-way valve 2, wherein the one-way valve 2 is installed at the top of the conveying pipeline 1. The one-way valve 2 includes a valve body 2-2 and a delivery pipe 1 installed at the bottom of the valve body 2-2. The valve body 2-2, as one of the main structures of the one-way valve, is a carrier that supports and connects other parts, and also provides a channel for the flow of compressed air.

[0023] A filter nozzle 2-1 is installed on the left end of the valve body 2-2, a sliding sleeve 2-8 is installed on the right end of the sliding sleeve 2-8, and a sleeve 2-11 is installed on the right end of the sleeve 2-11. An adjusting screw 2-10 is inserted into the inside of the sleeve 2-11. A spring 2-9 is connected to the left side surface of the adjusting screw 2-10. The adjusting screw 2-10 is movably connected to one end of the spring 2-9. The adjusting screw 2-10 is used to adjust the opening pressure of the one-way valve. Its principle is to adjust the spring force of the spring 2-9 by adjusting the screw screw insertion length, so that a certain force is formed between the sealing gasket 2-5 and the valve body sealing ring 2-2.

[0024] A valve stem 2-7 is inserted into the middle position of the sliding sleeve 2-8. The valve stem 2-7 is located inside the spring 2-9. One end of the valve stem 2-7 is connected to the sealing gasket 2-5 and the pressure plate 2-6, and the other end is in contact with the end face of the spring 2-9. When the pressure difference thrust formed inside and outside the conveying pipe is greater than the preset elastic force of the spring 2-9, one side of the spring 2-9 slides, the one-way valve is opened, and the external airflow enters the conveying pipe; otherwise, it will remain still.

[0025] The left end of the valve stem 2-7 is threaded with a lock nut 2-3. The right side surface of the lock nut 2-3 is connected with a flat washer 2-4. The right side surface of the flat washer 2-4 is connected with a sealing gasket 2-5. The sealing gasket 2-5 is movably connected to the inner wall surface of the valve body 2-2. The sealing gasket 2-5 is in conjunction with the sealing ring structure inside the valve body 2-2 to form a sealing structure, thereby blocking or opening the airflow passage between the delivery pipe and the outside.

[0026] The surface of the sealing gasket 2-5 is connected to the pressure plate 2-6. The valve stem 2-7 is located inside the sleeve 2-11. The sleeve 2-11 is used to fix the adjusting screw 2-10 and to cooperate with the adjusting screw 2-10 to form a sealing structure to prevent air leakage on this side. The valve stem 2-7 is inserted into the middle position of the pressure plate 2-6, the middle position of the sealing gasket 2-5, and the middle position of the flat washer 2-4.

[0027] The filter nozzle 2-1 serves as the inlet for external airflow into the pipeline during the "air replenishment" process to remove blockages. It filters the airflow and reduces airflow noise. A standard powder metallurgy copper silencer can be used as a substitute. The anti-loosening nut 2-3, together with the flat washer 2-4 and the pressure plate 2-6, is used to fix the sealing gasket 2-5.

[0028] During use, when conveying under negative pressure, the pressure difference between the inside and outside of the pipeline increases as the pressure along the pipeline is reduced and the pressure at the local pressure decreases, which is closer to the Roots vacuum pump.

[0029] Utilizing this feature, check valves can be arranged at certain intervals along the negative pressure conveying pipeline. The opening pressure of the check valves can be adjusted by regulating the 2-10 adjusting screw. The opening pressure is relatively higher the closer to the Roots vacuum pump, to prevent the check valves in the non-blocked sections of the pipeline from opening first when the pipeline is blocked, causing a sudden drop in pressure difference in the blocked section and making it impossible to eliminate the blockage. Therefore, the pressure distribution of the check valves along the conveying pipeline is as follows: the closer to the Roots vacuum pump, the higher the pressure setting value, with the highest value not exceeding the maximum vacuum value of the Roots vacuum pump; the farther away from the Roots vacuum pump, the lower the pressure setting value, with the lowest value not lower than the minimum vacuum value formed by the Roots vacuum pump at the beginning of the conveying process. Once the conveying pipeline becomes blocked, the check valves located in the blocked section will open under the action of the pressure difference between the inside and outside of the pipe, allowing external airflow into the pipeline, thus turning the blocked section into the "starting point" of the negative pressure conveying, dividing the blocked material and conveying it to the end point. If the blockage is long, the above process will proceed sequentially, and the "starting point" will become a dynamic point until the blockage in the pipeline is completely eliminated.

[0030] For some flammable and explosive materials, when using negative pressure conveying, the one-way valve inlet and the 2-1 filter nozzle can be connected to the protective gas pipeline to achieve safe conveying.

[0031] Although embodiments of the present 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 the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A one-way valve for a negative pressure pneumatic conveying system, comprising a conveying pipeline (1) and a one-way valve (2), characterized in that: The one-way valve (2) is installed at the top of the conveying pipeline (1); The one-way valve (2) includes a valve body (2-2), a filter nozzle (2-1) is installed at the left end of the valve body (2-2), a sliding sleeve (2-8) is installed at the right end of the sliding sleeve (2-8), a sleeve (2-11) is installed at the right end of the sleeve (2-11), an adjusting screw (2-10) is inserted inside the sleeve (2-11), a spring (2-9) is connected to the left side surface of the adjusting screw (2-10), a valve stem (2-7) is inserted at the middle position of the sliding sleeve (2-8), a lock nut (2-3) is threaded to the left end of the valve stem (2-7), a flat washer (2-4) is connected to the right side surface of the lock nut (2-3), a sealing gasket (2-5) is connected to the right side surface of the flat washer (2-4), and a pressure plate (2-6) is connected to the surface of the sealing gasket (2-5).

2. The one-way valve for a negative pressure pneumatic conveying system according to claim 1, characterized in that: The valve stem (2-7) is inserted into the middle position of the pressure plate (2-6), the valve stem (2-7) is inserted into the middle position of the sealing gasket (2-5), and the valve stem (2-7) is inserted into the middle position of the flat washer (2-4).

3. A one-way valve for a negative pressure pneumatic conveying system according to claim 2, characterized in that: The delivery pipe (1) is installed at the bottom of the valve body (2-2).

4. A one-way valve for a negative pressure pneumatic conveying system according to claim 3, characterized in that: The valve stem (2-7) is located inside the spring (2-9).

5. A one-way valve for a negative pressure pneumatic conveying system according to claim 4, characterized in that: The adjusting screw (2-10) is movably connected to one end of the spring (2-9).

6. A one-way valve for a negative pressure pneumatic conveying system according to claim 5, characterized in that: The sealing gasket (2-5) is movably connected to the inner wall surface of the valve body (2-2).

7. A one-way valve for a negative pressure pneumatic conveying system according to claim 6, characterized in that: The valve stem (2-7) is located inside the sleeve (2-11).

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