Valve needle sleeve structure capable of reducing pressure of valve needle

Abstract

The utility model discloses a valve needle sleeve structure capable of reducing the pressure of a valve needle, and particularly relates to the technical field of valve needle sleeves, the valve needle sleeve structure comprises a valve needle main body, a valve core air pressure runner and a sealing assembly, the air pressure runner is respectively arranged at the centers of the valve needle main body, a valve core and an inner cavity of a valve control handle, and the inner cavity of the valve control handle is provided with a double-way air outlet cavity; the sealing assembly is arranged in an inner cavity of the sealing mounting hole; through the air pressure flow channel and the two-way air outlet cavity, after the valve is closed, only the sealing assembly needs to be opened, accumulated air is guided to be released gradually, the air pressure flow channel and the two-way air outlet cavity are used for relieving pressure, the air release process can be smoothed, pressure impact caused by sudden opening or closing of the valve is avoided, and the safety of the valve is improved. Equipment damage caused by too large pressure is prevented, the service life of a system assembly is prolonged, a wide area is formed in the middle of the calabash-shaped air pressure flow channel, the flow speed of fluid in the area can be slowed down, and therefore the pressure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valve needle sleeves. More specifically, the utility model relates to a valve needle sleeve structure that can reduce the pressure on the valve needle. Background Art

[0002] A valve needle is a product of an industrial needle valve system. The valve needle is installed and used in cooperation with a valve needle sleeve to maintain its relative stability during use and improve the sealing performance during use. The valve needle is required to have high hardness, strength, and good toughness during processing, and can be applicable to different injection molded products;

[0003] After retrieval, the existing patent (Publication No.: CN213733173U) discloses a valve needle sleeve structure that can reduce the pressure on the valve needle, including a valve needle body, a positioning column, a side groove, and a driving rack. A protective needle sleeve is installed outside the valve needle body, and a drainage groove is opened below the outer side of the protective needle sleeve. The positioning column is fixedly installed on the inner side of the pressure reducing block, and a fixing block is welded on the side of the positioning column. The side groove is reserved on the outer side of the protective needle sleeve. Adjusting slide rods are symmetrically installed on both sides inside the protective needle sleeve, and a pressure reducing plate is movably installed on the outer side of the adjusting slide rods. A limiting column is fixedly installed on the side of the pressure reducing plate, and a transmission rack is welded on the side of the limiting column. The driving rack is fixedly installed on the outer side of the fixing block. This valve needle sleeve structure that can reduce the pressure on the valve needle adopts a new structural design, enabling the device to buffer and decompress the fluid injection pressure, improving the smoothness of the movement of the valve needle body, and reducing the pressure during the use of the valve needle body. The inventor found the following problems in the prior art during the implementation of this utility model:

[0004] In the existing valve needle sleeve structure, when the valve suddenly closes, the momentum of the fluid is quickly blocked, and the fluid changes from high-speed flow to a stationary state in a short time. This rapid change in momentum will cause an instantaneous change in pressure, resulting in a pressure shock. The valve needle sleeve may not be able to withstand the sudden pressure change under the pressure shock, causing failure or damage, and affecting the equipment;

[0005] Therefore, a valve needle sleeve structure that can reduce the pressure on the valve needle is proposed for the above problems. Summary of the Utility Model

[0006] In order to overcome the above-mentioned defects of the prior art, the utility model provides a valve needle sleeve structure that can reduce the pressure on the valve needle to solve the problems raised in the above background art.

[0007] To achieve the above object, the present utility model provides the following technical solutions: A valve needle sleeve structure capable of reducing the pressure of the valve needle, comprising a valve needle body, a valve core air pressure flow channel and a sealing assembly. The valve core is arranged at the lower end of the valve needle body, and a valve control handle is arranged at the upper end of the valve needle body. The air pressure flow channels are respectively opened at the centers of the inner cavities of the valve needle body, the valve core and the valve control handle. A double-way air outlet cavity is opened in the inner cavity of the valve control handle, and a sealing installation hole is opened at the center of the upper end of the valve control handle. The sealing assembly is arranged in the inner cavity of the sealing installation hole;

[0008] The sealing assembly includes a bolt, the bolt is arranged on the inner surface of the sealing installation hole, a connecting sealing shaft is arranged at the lower end of the bolt, a sealing ring is arranged at the lower end of the connecting sealing shaft, and a sealing plug is arranged at the center of the lower end of the sealing ring.

[0009] Preferably, the shape of one of the air pressure flow channels is gourd-shaped, the three air pressure flow channels are communicated with each other, and one of the air pressure flow channels is connected to the center of the lower end of the double-way air outlet cavity.

[0010] Preferably, internal threads are opened on the inner surface of the upper end of the sealing installation hole, and the bolt is meshed with the internal threads.

[0011] Preferably, the connecting sealing shaft sequentially penetrates through the sealing installation hole and the double-way air outlet cavity, the sealing ring abuts against the connection part of the air pressure flow channel and the double-way air outlet cavity, and the outer surface of the sealing plug abuts against the inner surface of the upper end of one of the air pressure flow channels.

[0012] Preferably, a spring is arranged at the center of the outer surface of the valve needle body, and the inner surface of the spring abuts against the outer surface of the valve needle body.

[0013] Preferably, the materials of the sealing ring and the sealing plug are both rubber, and the shape of the sealing ring is circular.

[0014] The technical effects and advantages of the present utility model:

[0015] 1. Compared with the prior art, the valve needle sleeve structure capable of reducing the pressure of the valve needle enables the gas, after the valve is closed, to be gradually released by guiding the accumulated gas just by opening the sealing assembly through the air pressure flow channel and the double-way air outlet cavity. By releasing pressure through this air pressure flow channel and the double-way air outlet cavity, the gas release process can be smoothed, avoiding pressure shocks caused by sudden opening or closing of the valve, preventing equipment damage caused by excessive pressure, and helping to extend the service life of system components.

[0016] 2. Compared with the prior art, the valve needle sleeve structure capable of reducing the valve needle pressure forms a wide area at the middle position through the gourd-shaped air pressure flow channel, enabling the fluid to slow down in this area, thereby reducing the pressure. Its shape allows for contraction and expansion and can also accelerate the fluid, generating a smoother flow. Through the combination of acceleration and deceleration, the dynamic characteristics of the fluid can be controlled more effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall front sectional structure of the present utility model.

[0018] Figure 2 It is a schematic diagram of the unfolded structure of the replacement mechanism of the present utility model.

[0019] Figure 3 It is a schematic diagram of the connection structure between the tool body and the upper fixing block of the present utility model.

[0020] Figure 4 It is a schematic diagram of the connection structure between the milling cutter head and the clamping block of the present utility model.

[0021] The reference numerals are: 1. Valve needle body; 2. Valve core; 3. Valve control handle; 4. Air pressure flow channel; 5. Dual-channel air outlet cavity; 6. Sealed installation hole; 61. Internal thread; 7. Sealing assembly; 701. Bolt; 702. Connecting sealing shaft; 703. Sealing ring; 704. Plug; 8. Spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0023] Embodiment 1

[0024] As shown in the attached Figures 1 to 3 A valve needle sleeve structure capable of reducing the valve needle pressure includes a valve needle body 1, a valve core 2, an air pressure flow channel 4 and a sealing assembly 7. The valve core 2 is arranged at the lower end of the valve needle body 1. A valve control handle 3 is arranged at the upper end of the valve needle body 1. The air pressure flow channels 4 are respectively opened at the centers of the inner cavities of the valve needle body 1, the valve core 2 and the valve control handle 3. A dual-channel air outlet cavity 5 is opened in the inner cavity of the valve control handle 3. A sealed installation hole 6 is opened at the center of the upper end of the valve control handle 3. The sealing assembly 7 is arranged in the inner cavity of the sealed installation hole 6;

[0025] The sealing assembly 7 includes a bolt 701, the bolt 701 is arranged on the inner surface of the sealing mounting hole 6, a connecting sealing shaft 702 is arranged at the lower end of the bolt 701, a sealing ring 703 is arranged at the lower end of the connecting sealing shaft 702, and a sealing plug 704 is arranged at the center of the lower end of the sealing ring 703.

[0026] Wherein: when the sealing assembly 7 on the valve control handle 3 is opened, the air pressure flow channels 4 in the valve needle body 1, the valve core 2 and the valve control handle 3 are opened, and the accumulated gas is guided and discharged. The air pressure flow channels 4 communicate with the double-way air outlet cavity 5, so that the internal gas is discharged from the double holes. Timely discharging the accumulated gas can avoid potential safety hazards caused by too high gas pressure, ensure smoother gas exchange inside the equipment, contribute to the rapid release of gas, and further avoid pressure fluctuations caused by gas retention. When the bolt 701 is rotated downward along the internal thread 61, the sealing ring 703 and the sealing plug 704 at the lower end of the connecting sealing shaft 702 are driven to move, so that they can be in close contact with the connection part of the air pressure flow channel 4 and the double-way air outlet cavity 5, ensuring the sealing performance of the equipment during use and avoiding gas leakage.

[0027] Embodiment 2

[0028] On the basis of Embodiment 1, the solution in Embodiment 1 will be further refined and introduced in combination with the following specific working methods, as Figures 1 to 4 shown, and the details are described below:

[0029] As a preferred implementation manner, the shape of one group of air pressure flow channels 4 is gourd-shaped, the three groups of air pressure flow channels 4 communicate with each other, and one group of air pressure flow channels 4 is connected to the center of the lower end of the double-way air outlet cavity 5; further, the gourd-shaped air pressure flow channel 4 can more smoothly adjust the fluid pressure during the flow process, adapt to various load changes, and will not cause violent pressure fluctuations. The three groups of air pressure flow channels 4 guide and discharge the gas inside the valve.

[0030] As a preferred implementation manner, an internal thread 61 is provided on the inner surface of the upper end of the sealing mounting hole 6, and the bolt 701 meshes with the internal thread 61; further, the bolt 701 can perform a vertical linear movement along the inner surface of the internal thread 61 by rotating.

[0031] As a preferred implementation manner, the connecting sealing shaft 702 sequentially penetrates through the sealing mounting hole 6 and the double-way air outlet cavity 5, the sealing ring 703 abuts against the connection part of the air pressure flow channel 4 and the double-way air outlet cavity 5, and the outer surface of the sealing plug 704 abuts against the inner surface of the upper end of one group of air pressure flow channels 4; further, the connecting sealing shaft 702 penetrates through the sealing mounting hole 6 and the double-way air outlet cavity 5 to drive the sealing ring 703 and the sealing plug 704 to move. When the sealing ring 703 seals the air pressure flow channel 4 by the sealing plug 704, further sealing is performed to improve the sealing effect.

[0032] As a preferred embodiment, a spring 8 is provided at the center of the outer surface of the valve needle body 1, and the inner surface of the spring 8 abuts against the outer surface of the valve needle body 1; further, the spring 8 provides sufficient return force for the valve needle body 1 and can play a buffering role.

[0033] As a preferred embodiment, the sealing ring 703 and the plug 704 are both made of rubber, and the shape of the sealing ring 703 is circular; further, the rubber sealing ring 703 and the plug 704 provide a tight sealing effect.

[0034] The working process of the present utility model is as follows: First, rotate the bolt 701 in the sealing assembly 7 so that it linearly moves along the internal thread 61 in the sealing mounting hole 6, and the bolt 701 is taken out or tightened by forward and reverse rotation. When it is necessary to open the air pressure flow channel 4 to release pressure, just take out the bolt 701 to drive the connecting sealing shaft 702 to move, so that the sealing ring 703 and the plug 704 are lifted from the connection between the air pressure flow channel 4 and the double-way air outlet cavity 5, thereby opening the air pressure flow channel 4 in the valve needle body 1, the valve core 2 and the valve control handle 3, guiding and discharging the accumulated gas, and the released air flow passes through and is discharged from the two holes of the double-way air outlet cavity 5. The gas passes through three groups of air pressure flow channels 4 in sequence. One of the air pressure flow channels 4 in the inner cavity of the valve needle body 1 forms a wide area in the middle position. The contraction of the middle part can reduce the flow rate of the fluid, thereby causing the pressure to decrease, so that the fluid can slow down the flow rate in this area. The pressure is reduced by the contraction and expansion of the gourd-shaped shape. The spring 8 provides sufficient return force for the valve needle body 1. The above is the working principle of the valve needle sleeve structure that can reduce the pressure of the valve needle.

[0035] Finally: The above description is only the preferred embodiments of the present utility model and is not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A valve needle sleeve structure capable of reducing the pressure of the valve needle, comprising a valve needle body (1), a valve core (2), an air pressure flow channel (4) and a sealing assembly (7), characterized in that: The valve core (2) is arranged at the lower end of the valve needle body (1), a valve control handle (3) is arranged at the upper end of the valve needle body (1), air pressure channels (4) are respectively arranged at the centers of the inner cavities of the valve needle body (1), the valve core (2) and the valve control handle (3), a dual-channel air outlet cavity (5) is arranged in the inner cavity of the valve control handle (3), a sealing installation hole (6) is arranged at the center of the upper end of the valve control handle (3), and a sealing component (7) is arranged in the inner cavity of the sealing installation hole (6); The sealing component (7) includes a bolt (701), the bolt (701) is arranged on the inner surface of the sealing installation hole (6), a connecting sealing shaft (702) is arranged at the lower end of the bolt (701), a sealing ring (703) is arranged at the lower end of the connecting sealing shaft (702), and a plug (704) is arranged at the center of the lower end of the sealing ring (703).

2. The valve needle sleeve structure capable of reducing the pressure of the valve needle according to claim 1, characterized in that: The shape of one group of the air pressure channels (4) is gourd-shaped, the three groups of air pressure channels (4) are communicated with each other, and one group of the air pressure channels (4) is connected to the center of the lower end of the dual-channel air outlet cavity (5).

3. A valve needle sleeve structure capable of reducing the pressure of the valve needle according to claim 1, characterized in that: Internal threads (61) are arranged on the inner surface of the upper end of the sealing installation hole (6), and the bolt (701) is meshed with the internal threads (61).

4. A valve needle sleeve structure capable of reducing the pressure of the valve needle according to claim 2, characterized in that: The connecting sealing shaft (702) sequentially penetrates through the sealing installation hole (6) and the dual-channel air outlet cavity (5), the sealing ring (703) abuts against the connection part of the air pressure channel (4) and the dual-channel air outlet cavity (5), and the outer surface of the plug (704) abuts against the inner surface of the upper end of one group of the air pressure channels (4).

5. A valve needle sleeve structure capable of reducing the pressure of the valve needle according to claim 1, characterized in that: A spring (8) is arranged at the center of the outer surface of the valve needle body (1), and the inner surface of the spring (8) abuts against the outer surface of the valve needle body (1).

6. A valve needle sleeve structure capable of reducing the pressure of the valve needle according to claim 3, characterized in that: The sealing ring (703) and the plug (704) are both made of rubber, and the shape of the sealing ring (703) is circular.

Images