A needle valve type seal ring-free cylinder device

Abstract

The utility model relates to the technical field of cylinder, specifically disclose a needle valve type sealless cylinder device. Including template, set up in the cylinder body of template and set up in the piston of cylinder body, the material of piston is elastic steel, including the piston body and needle valve connecting portion that are connected, needle valve connecting portion is used for installing needle valve, the piston body moves up and down in the cylinder body and will be divided into upper chamber and lower chamber in the cylinder body, the periphery of piston body has the deformation ring of integral forming, the piston body of deformation ring upper and lower sides is equipped with annular groove, and the deformation ring is tightly closed to the cylinder inner wall and forms the seal. The utility model discloses the periphery of piston body has the deformation ring of integral forming, and utilizes the sealing between the upper and lower two chambers of the deformation ring tightly closed cylinder inner wall to realize, cancelled the traditional rubber seal ring, solved the problem such as not high temperature resistance, short service life, not wear resistance of rubber seal ring in the prior art, has higher practical value and broad application prospect.

Description

Technical Field

[0001] This utility model relates to the technical field of cylinder devices, and specifically discloses a needle valve type sealless cylinder device. Background Technology

[0002] Injection molding hot runner cylinders are important pieces of equipment widely used in the plastic molding industry, primarily for controlling the opening and closing of molds and the flow of molten plastic during the injection molding process. (Refer to...) Figure 1 Its basic structure includes a cylinder body housed within a mold, a cylinder head plate on top of the cylinder body, and a piston that moves up and down within the cylinder body. During operation, gas is introduced into the cylinder body through upper and lower air passages, driving the piston to move up and down, which in turn moves the valve needle up and down, achieving precise control of the injection molding process. This cylinder device plays a crucial role in improving production efficiency and ensuring product quality.

[0003] However, traditional injection molding hot runner cylinders have some shortcomings in practical applications. Currently, most cylinders are equipped with Glyd rings or sealing rings to seal the cylinder and prevent air leakage between the upper and lower air passages. However, these rubber seals have significant drawbacks: firstly, they are not heat-resistant and are prone to aging and deformation in high-temperature environments, leading to decreased sealing performance and shortened cylinder lifespan; secondly, rubber sealing rings have poor wear resistance, and the frictional heat generated during the frequent up-and-down movement of the piston accelerates their wear, further reducing their lifespan and increasing equipment maintenance costs and downtime. The lifespan of the Glyd ring on the piston's outer circumference is particularly severely affected by the frictional heat generated during piston movement. These problems, to some extent, limit the performance improvement and widespread application of injection molding hot runner cylinders. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a needle valve type cylinder device without a seal ring.

[0005] This utility model discloses a needle valve type seal-free cylinder device, which adopts the following technical solution:

[0006] A needle valve type sealless cylinder device includes a template, a cylinder body disposed within the template, and a piston disposed within the cylinder body. The piston is made of elastic steel and includes a piston body connected to it and a needle valve connection part. The needle valve connection part is used to install a needle valve. The piston body moves up and down within the cylinder body and divides the cylinder body into an upper chamber and a lower chamber. A deformation ring is integrally formed on the periphery of the piston body. The piston body on the upper and lower sides of the deformation ring is provided with annular grooves. The deformation ring abuts against the inner wall of the cylinder body to form a seal.

[0007] Preferably, the template includes an upper cylinder plate and a lower cylinder plate, the lower cylinder plate is provided with a mounting cavity, the cylinder body is disposed in the mounting cavity, the upper cylinder plate is provided with an upper air passage communicating with the upper chamber of the cylinder body, and the lower cylinder plate is provided with a lower air passage communicating with the lower chamber of the cylinder body.

[0008] Preferably, the mounting cavity of the lower cylinder plate is provided with a base, the upper end of the base is provided with a first abutting part that abuts and seals against the lower end of the cylinder body, the piston body moves up and down in the movable cavity formed by the cylinder body and the base, the middle part of the base is provided with a shaft hole for the needle valve connection part to move up and down, and the base is provided with an air port that connects the lower chamber of the cylinder body and the lower air passage.

[0009] Preferably, the base has a second abutting part on the inner circumference of the shaft hole, and the second abutting part is tightly sealed against the surface of the needle valve connection part.

[0010] Preferably, the upper cylinder plate has a sealing boss on its lower end face facing the mounting cavity, the cylinder body is a hollow cylindrical structure that runs vertically through the cylinder, the upper end of the cylinder body is pressed and bent by the lower end face of the upper cylinder plate, and bent to abut against the side end of the sealing boss for sealing.

[0011] Preferably, the opening of the upper air passage connecting to the cylinder body is located at the center of the sealing boss, and the direction of the opening is on the axis of the piston.

[0012] Preferably, the piston has a needle valve mounting groove for mounting the needle valve, and a fixing member is threadedly connected in the mounting groove. The fixing member fixes the needle valve in the needle valve mounting groove, and a third abutting part is provided on the outer periphery of the fixing member. The third abutting part abuts and seals against the needle valve mounting groove.

[0013] Preferably, the piston is made of 60Si2Mn spring steel.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects:

[0015] This invention utilizes a deformable ring integrally formed around the periphery of the piston body, which abuts against the inner wall of the cylinder to achieve a seal between the upper and lower chambers, eliminating the need for traditional rubber sealing rings. This design leverages the elastic deformation of steel to achieve a seal, effectively improving the cylinder's high-temperature resistance and wear resistance, enabling it to maintain stable sealing performance in high-temperature environments and extending its service life. It also simplifies the cylinder's structure and reduces production costs. Furthermore, the annular grooves on the upper and lower sides of the deformable ring allow it to swing flexibly during piston movement, further enhancing the sealing effect and improving the cylinder's working efficiency and reliability. This design solves the problems of existing rubber sealing rings, such as poor high-temperature resistance, short service life, and poor wear resistance, demonstrating high practical value and broad application prospects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a cylinder structure in the prior art;

[0017] Figure 2 This is a schematic diagram of the needle valve type sealless cylinder device in this embodiment;

[0018] Figure 3 for Figure 2 Enlarged view of A;

[0019] Figure 4 for Figure 2 Enlarged view of B;

[0020] Figure 5 for Figure 2 Enlarged view of C.

[0021] Explanation of icon numbers:

[0022] 1. Upper cylinder plate; 11. Upper air passage; 12. Sealing boss; 2. Cylinder block; 3. Piston; 31. Piston body; 311. Deformation ring; 312. Annular groove; 32. Needle valve connection; 4. Base; 41. First abutment part; 42. Second abutment part; 43. Air port; 5. Lower cylinder plate; 51. Lower air passage; 6. Fixing component; 61. Third abutment part; 100. Sealing ring; 200. Glyd ring. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] This embodiment discloses a needle valve type seal-free cylinder device, referring to... Figure 2 It includes the template, cylinder 2 and piston 3.

[0025] The piston 3 is made of elastic steel and includes a piston body 31 and a needle valve connection part 32. The piston body 31 and the needle valve connection part 32 are connected and integrally formed. The needle valve connection part 32 is used to install the needle valve. The piston body 31 moves up and down in the cylinder 2, dividing the cylinder 2 into an upper chamber and a lower chamber. A deformation ring 311 is integrally formed on the periphery of the piston body 31. The piston body 31 has annular grooves 312 on the upper and lower sides of the deformation ring 311. The deformation ring 311 abuts against the inner wall of the cylinder 2 to form a seal. This solution eliminates the traditional rubber sealing ring. When the piston 3 moves up and down, the deformation ring 311 can swing to the annular grooves 312 on the upper and lower sides and tightly fit against the inner wall of the cylinder 2 to form a reliable sealing effect, effectively preventing gas leakage between the upper and lower chambers, improving the working efficiency and reliability of the cylinder. This solution achieves sealing by utilizing the elastic deformation of steel, effectively improving the high temperature resistance and wear resistance of the cylinder, extending the service life of the cylinder, and simplifying the cylinder structure while reducing production costs.

[0026] As a preferred option, the piston 3 is made of 60Si2Mn spring steel. 60Si2Mn spring steel has good elastic properties and strength, and can maintain stable elastic deformation in high-temperature environments. This ensures that the deformation ring can tightly abut against the inner wall of the cylinder 2 when the piston 3 moves up and down inside the cylinder 2, achieving a reliable sealing effect. At the same time, this material also has high wear resistance and fatigue resistance, which can extend the service life of the piston and improve the overall performance of the cylinder.

[0027] As a preferred embodiment, the template includes an upper cylinder plate 1 and a lower cylinder plate 5. The lower cylinder plate 5 has a mounting cavity, and the cylinder body 2 is installed in the mounting cavity. The upper cylinder plate 1 has an upper air passage 11 communicating with the upper chamber of the cylinder body, and the lower cylinder plate 5 has a lower air passage 51 communicating with the lower chamber of the cylinder body 2. Gas is introduced into the upper and lower chambers of the cylinder body 2 through the upper air passage 11 and the lower air passage 51, respectively, which can effectively drive the piston to move up and down, realizing the function of the cylinder. By adopting the above template structure, the installation and fixation of the cylinder body 2 can be facilitated, and the maintenance and disassembly process of the cylinder device is also easier, improving production efficiency.

[0028] As a preferred embodiment, the upper cylinder plate 1 has a sealing boss 12 on its lower end face facing the mounting cavity. The cylinder body 2 is a hollow cylindrical structure that runs vertically through the cylinder. The upper end of the cylinder body 2 is bent by the pressure of the lower end face of the upper cylinder plate 1 and is bent to abut against the side end of the sealing boss 12 for sealing. This structural design can effectively prevent gas leakage from the upper end of the cylinder body 2, improve the sealing performance of the cylinder device, and ensure the stability and reliability of the cylinder during operation. At the same time, this design can achieve sealing without the need for a sealing ring, simplifying the sealing structure and reducing production costs.

[0029] As a preferred embodiment, the opening of the upper air passage 11 connecting to the cylinder body 2 is located at the center of the sealing boss 12, and the direction of the opening is on the axis of the piston 3. This design allows gas to enter the upper chamber evenly, ensuring smooth piston movement and avoiding unstable piston movement caused by uneven gas distribution, thereby improving the working accuracy and reliability of the cylinder.

[0030] As a preferred option, refer to Figure 3 The mounting cavity of the lower cylinder plate 5 is equipped with a base 4. The upper end of the base 4 is provided with a first abutment part 41 that abuts and seals against the lower end of the cylinder 2. The piston body 31 moves up and down in the movable cavity formed by the cylinder 2 and the base 4. The middle part of the base 4 is provided with a shaft hole for the needle valve connection part 32 to move up and down. The bottom outer periphery of the base 4 is provided with a groove to form an annular air passage with the mounting cavity. The annular air passage is connected to the lower air passage 51. The bottom periphery of the base 4 is provided with multiple air ports 43 at intervals to connect the lower chamber of the cylinder 2 and the annular air passage, so as to realize the connection between the lower chamber of the cylinder 2 and the lower air passage 51. This base 4 structure design can achieve the sealing of the lower end of the cylinder 2, and realize the connection between the lower chamber of the cylinder 2 and the lower air passage 51 through the groove and the air port 43, ensuring that the gas can smoothly enter the lower chamber and drive the piston to move up and down.

[0031] As a preferred option, refer to Figure 4 The base 4 has a second abutment part 42 on the inner circumference of the shaft hole, which abuts and seals against the surface of the needle valve connection part 32. This design can further improve the sealing performance between the piston 3 and the base, prevent gas from leaking from the gap between the needle valve connection part 32 and the shaft hole, ensure the normal operation of the cylinder device, and improve the working efficiency and reliability of the cylinder.

[0032] As a preferred option, refer to Figure 5 The piston 3 has a needle valve mounting groove for installing the needle valve. A fixing member 6 is threaded into the mounting groove, which fixes the needle valve in the mounting groove. The fixing member 6 has a third abutment part 61 on its outer periphery, which abuts and seals against the mounting groove. This design enables stable installation and fixation of the needle valve, while ensuring the sealing performance between the needle valve and the piston 3, ensuring that the needle valve can work normally and control the gas flow.

[0033] When installing the needle valve type seal-free cylinder device of this scheme, first install the needle valve into the mounting groove of the piston 3, and thread the fixing part 6 so that the third abutment part 61 of the fixing part 6 abuts against the mounting groove, thereby achieving good sealing between the needle valve and the piston 3; then install the piston 3 into the cylinder body 2, and use the elastic force of the integrally formed deformation ring 311 to press against the inner wall of the cylinder body 2, thereby achieving good sealing between the piston 3 and the cylinder body 2 without the need for a sealing ring; subsequently, the bottom... The base 4 is placed in the mounting cavity of the lower cylinder plate 5, and then the cylinder 2, which is equipped with the piston 3, is placed in the mounting cavity. Then the upper cylinder plate 1 is installed on the lower cylinder plate 5. At this time, the upper cylinder plate 1 presses the cylinder 2 against the base 4, so that the lower end of the cylinder 2 abuts against the first abutment part 41 of the base 4, and the upper end of the cylinder 2 is bent by pressure and abuts against the side end of the sealing boss 12 of the upper cylinder plate 1. Thus, the cylinder 2 can achieve a good sealing effect in the upper cylinder plate 1 and the lower cylinder plate 5 without the need for a sealing ring.

[0034] By implementing the above-mentioned preferred solutions, the needle valve type sealless cylinder device of this utility model can effectively solve the problems of rubber seals being not resistant to high temperatures, having a short service life, and being not wear-resistant in the prior art, and has high practical value and broad application prospects.

[0035] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A needle valve type seal-free cylinder device, comprising a template, a cylinder body disposed within the template, and a piston disposed within the cylinder body, characterized in that, The piston is made of elastic steel and includes a piston body and a needle valve connection part connected to each other. The needle valve connection part is used to install a needle valve. The piston body moves up and down in the cylinder and divides the cylinder into an upper chamber and a lower chamber. A deformation ring is integrally formed on the periphery of the piston body. The piston body on the upper and lower sides of the deformation ring is provided with annular grooves. The deformation ring abuts against the inner wall of the cylinder to form a seal.

2. The needle valve type sealless cylinder device according to claim 1, characterized in that, The template includes an upper cylinder plate and a lower cylinder plate. The lower cylinder plate is provided with a mounting cavity. The cylinder body is disposed in the mounting cavity. The upper cylinder plate is provided with an upper air passage communicating with the upper chamber of the cylinder body. The lower cylinder plate is provided with a lower air passage communicating with the lower chamber of the cylinder body.

3. The needle valve type sealless cylinder device according to claim 2, characterized in that, The mounting cavity of the lower cylinder plate is provided with a base. The upper end of the base is provided with a first abutting part that abuts and seals against the lower end of the cylinder. The piston body moves up and down in the movable cavity formed by the cylinder and the base. The middle part of the base is provided with a shaft hole for the needle valve connection part to move up and down. The base is provided with an air port that connects the lower chamber of the cylinder and the lower air passage.

4. The needle valve type sealless cylinder device according to claim 3, characterized in that, The base has a second abutting part on the inner circumference of the shaft hole, and the second abutting part is tightly sealed against the surface of the needle valve connection part.

5. The needle valve type sealless cylinder device according to claim 2, characterized in that, The upper cylinder plate has a sealing boss on its lower end face facing the mounting cavity. The cylinder body is a hollow cylindrical structure that runs vertically through the cylinder. The upper end of the cylinder body is pressed and bent by the lower end face of the upper cylinder plate, and bent to be tightly sealed against the side end of the sealing boss.

6. The needle valve type sealless cylinder device according to claim 5, characterized in that, The opening of the upper air passage connecting to the cylinder body is located at the center of the sealing boss, and the direction of the opening is on the axis of the piston.

7. The needle valve type sealless cylinder device according to claim 1, characterized in that, The piston has a needle valve mounting groove for installing the needle valve. A fixing member is threaded into the mounting groove to fix the needle valve in the needle valve mounting groove. The outer periphery of the fixing member has a third abutment part, which abuts and seals against the needle valve mounting groove.

8. The needle valve type sealless cylinder device according to claim 1, characterized in that, The piston is made of 60Si2Mn spring steel.

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