Plastic air cylinder structure based on angle seat valve

Abstract

The utility model relates to a plastic air cylinder structure based on an angle seat valve, which comprises a valve body, a connecting piece, an air cylinder assembly, a sealing assembly, a valve rod and a valve core, the air cylinder assembly comprises an air cylinder body, an air cylinder cover, a piston and a piston ring, the air cylinder body and the air cylinder cover are combined to form a piston cavity, and the piston connected with the valve rod is slidably connected in the piston cavity. The cylinder body is provided with a first air hole and a second air hole which are communicated with the piston cavity, and a piston ring hermetically connected with the piston is arranged between the first air hole and the second air hole; the main purpose of the utility model is that the cylinder body and the cylinder cover are integrally formed by injection molding, the piston ring on the piston is clamped between the cylinder body and the cylinder cover by optimizing the structure of the cylinder, the piston ring is ensured to be always arranged between the first air hole and the second air hole, and the technical bottleneck that the distance between the air holes restricts the stroke of the valve rod in the traditional cylinder design is solved; the application range is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of angle seat valves, in particular to a plastic cylinder structure based on the angle seat valve. Background Art

[0002] In the cylinder structure of a traditional angle seat valve, a piston ring is usually installed on the piston, and the piston is tightly fitted with the inner wall of the cylinder through the piston ring to meet the needs of pneumatic control. During the movement of the piston, the piston ring will move up and down with the piston, and the piston ring needs to be set between the air inlet and air outlet of the cylinder, otherwise the cylinder will fail. Therefore, the cylinder structure has certain limitations. When the hole spacing between the air inlet and air outlet is too small, the adjustable stroke range of the angle seat valve is small. If the angle seat valve needs to be increased, the hole spacing between the air inlet and air outlet needs to be changed, and the pneumatic controller adapted thereto needs to be replaced. It is impossible to achieve universalization of accessories, which increases the management cost of accessories. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the technical solution adopted by the utility model is: a plastic cylinder structure based on an angle seat valve, including a valve body, a connecting piece, a cylinder assembly, a sealing assembly, a valve stem and a valve core, the valve body is connected to the cylinder assembly through a connecting piece, the connecting piece is slidably connected to the valve stem for controlling the flow through the sealing assembly, one end of the valve stem is connected to the valve core, the cylinder assembly includes a cylinder body, a cylinder head, a piston and a piston ring, the cylinder body and the cylinder head are combined to form a piston cavity, a piston connected to the valve stem is slidably connected in the piston cavity, the cylinder body is provided with a first air hole and a second air hole connected to the piston cavity, a piston ring sealed and connected to the piston is provided between the first air hole and the second air hole.

[0004] Using the above technical solution, the cylinder block and cylinder head are both injection molded as one piece. By optimizing the cylinder structure, the piston ring on the piston is clamped between the cylinder block and the cylinder head, ensuring that the piston ring is always located between the first air hole and the second air hole. This solves the technical bottleneck of the air hole spacing restricting the valve stem stroke in the traditional cylinder design and has a wide range of applications.

[0005] The utility model is further configured as follows: the cylinder body is provided with a threaded portion and a step surface, the cylinder head is provided with a stud portion adapted to the threaded portion, the cylinder head is threadedly connected to the cylinder body through the stud portion, the piston ring is clamped between the end face of the stud portion and the step surface, and the piston is provided with a circular ring portion for sleeve-fitting the piston ring.

[0006] By adopting the above technical solution, the outer side of the piston ring is interference fit between the cylinder head and the cylinder body, which also ensures that the inner side of the piston ring always maintains a radial seal with the piston, making it difficult for the piston ring to dislocate and maintaining the stability of the piston transmission structure.

[0007] The present invention is further configured such that the stud portion is provided with circumferentially distributed ventilation grooves, and the first air hole is communicated with the piston cavity through the ventilation grooves.

[0008] By adopting the above technical solution, when the cylinder body and the cylinder head are threadedly connected, the air vent is used to prevent the stud from blocking the first air hole, so that the piston cavity can be connected to the external air source through the first air hole, ensuring the normal operation of the piston.

[0009] The utility model is further configured such that a mounting hole for installing a sealing assembly is provided at the bottom of the cylinder body, and the sealing assembly includes a seal, a sealing spring, a locking nut and a U-shaped sealing ring which are sequentially sleeved on the valve stem from bottom to top, and the connecting piece is threadedly connected to the locking nut through the mounting hole.

[0010] By adopting the above technical solution, the two ends of the sealing spring abut against the seal and the locking screw sleeve, and the sealing spring applies axial pressure to the seal. The sealing spring has a self-compensating function, so that the seal is always in a sealed state with the valve stem, avoiding the sealing effect affected by the installation error of the connecting part and the locking screw sleeve.

[0011] The utility model is further configured such that the connecting piece is provided with a receiving groove for installing a sealing piece, an opening of the receiving groove is provided with an internal thread for threadedly connecting a locking screw sleeve, and the locking screw sleeve and the connecting piece are provided with a first limiting portion and a second limiting portion for limiting positioning.

[0012] By adopting the above technical solution, the locking screw sleeve and the connecting piece are connected to the cylinder body in a clamping connection manner, which also allows the cylinder assembly to rotate relative to the connecting piece, thereby realizing arbitrary adjustment of the air hole direction and flexible adjustment of the air source pipeline.

[0013] The present invention is further configured such that a cylinder spring is provided between the piston ring and the cylinder body / cylinder head, and the cylinder spring is sleeved in the annular portion.

[0014] By adopting the above technical solution, when the cylinder spring is located between the piston ring and the cylinder body, the angle seat valve is a normally open structure. Conversely, when the cylinder spring is located between the piston ring and the cylinder head, the angle seat valve is a normally closed structure. By changing the position of the cylinder spring, the angle seat valve can be realized as a normally open or normally closed function to meet various application requirements.

[0015] The utility model is further configured such that the first air hole and the second air hole are provided with threaded holes for connecting to an external air source pipeline, and the cylinder body is provided with connecting holes for fixing the pneumatic controller on both sides of the first air hole and the second air hole.

[0016] With the above technical solution, the threaded hole supports a separate air source pipeline for an external air source, and the connection hole supports the installation of a pneumatic controller, so that the angle seat valve can choose to install an independent air source pipeline or an integrated pneumatic controller, which has a wide range of applications.

[0017] The present invention is further configured such that the cylinder head is provided with a window piece, and the valve stem is provided with an indicator rod in a direction toward the window piece.

[0018] With the above technical solution, the window piece is made of transparent plastic, and the indicator rod can be clearly seen through the window piece, so as to judge the relative position of the valve core in the valve body and realize the visualization of the working status of the angle seat valve.

[0019] The embodiments of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the normally closed angle seat valve of the present utility model;

[0021] Figure 2 For the utility model Figure 1 A partial enlarged view of the A direction view;

[0022] Figure 3 For the utility model Figure 1 A partial enlarged view of the middle B direction view;

[0023] Figure 4 It is a top view of the utility model;

[0024] Figure 5 For the utility model Figure 1 A partial enlarged view of the C-direction view;

[0025] Figure 6 This is a cross-sectional view of the normally open angle seat valve of the present utility model;

[0026] Wherein: 1 - valve body, 2 - connecting piece, 3 - cylinder assembly, 4 - sealing assembly, 5 - valve stem, 6 - valve core, 11 - piston chamber, 12 - first air hole, 13 - second air hole, 14 - threaded hole, 15 - connecting hole, 21 - receiving groove, 22 - second limiter, 31 - cylinder body, 32 - cylinder head, 33 - piston, 34 - piston ring, 35 - first sealing ring, 36 - window, 37 - indicator rod, 38 - fourth sealing ring, 311 - threaded part, 312 - step surface, 313 - mounting hole, 321 - stud part, 322 - breathable groove, 331 - circular ring part, 41 - sealing part, 42 - sealing spring, 43 - locking screw sleeve, 44 - U-shaped sealing ring, 45 - second sealing ring, 46 - third sealing ring, 431 - first limiter, 432 - countersunk groove; DETAILED DESCRIPTION

[0027] like Figure 1 、 2As shown, this embodiment provides a plastic cylinder structure based on an angle seat valve, including a valve body 1, a connecting member 2, a cylinder assembly 3, a sealing assembly 4, a valve stem 5 and a valve core 6. The valve body 1 is connected to the cylinder assembly 3 through the connecting member 2, and the connecting member 2 is slidably connected to the valve stem 5 for controlling the flow through the sealing assembly 4. One end of the valve stem 5 is connected to the valve core 6. The cylinder assembly 3 includes a cylinder body 31, a cylinder head 32, a piston 33 and a piston ring 34. The cylinder body 31 and the cylinder head 32 are combined to form a piston chamber 11. The piston 33 connected to the valve stem 5 is slidably connected in the piston chamber 11. The cylinder body 31 is provided with a first air hole 12 and a second air hole 13 connected to the piston chamber 11. A piston ring 34 sealed and connected to the piston 33 is provided between the first air hole 12 and the second air hole 13.

[0028] In the present invention, the cylinder body 31 and the cylinder head 32 are both integrally injection molded. By optimizing the cylinder structure, the piston ring 34 on the piston 33 is clamped between the cylinder body 31 and the cylinder head 32, ensuring that the piston ring 34 is always located between the first air hole 12 and the second air hole 13. This also ensures that the distance between the first air hole 12 and the second air hole 13 does not affect the stroke of the valve stem 5. There is no need to adjust the air hole position in order to increase the stroke of the angle seat valve. It is suitable for installing a pneumatic controller with a fixed air hole position.

[0029] Combine Figure 2 As shown, in this embodiment, the cylinder body 31 and the cylinder head 32 are injection molded as a whole, the cylinder body 31 is provided with a threaded portion 311 and a step surface 312, the cylinder head 32 is provided with a stud portion 321 adapted to the threaded portion 311, the cylinder head 32 is threadedly connected to the cylinder body 31 through the stud portion 321, the piston ring 34 is clamped between the end face of the stud portion 321 and the step surface 312, the piston 33 is provided with a circular ring portion 331 for sleeved with the piston ring 34, the outer side of the piston ring 34 is interference fit between the cylinder head 32 and the cylinder body 31, which also ensures that the inner side of the piston ring 34 always maintains a radial seal with the piston 33, a first sealing ring 35 is provided between the stud portion 321 and the threaded portion 311, the stud portion 321 is provided with a circumferentially distributed air vent grooves 322, and the first air hole 12 is connected to the piston cavity 11 through the air vent grooves 322.

[0030] Combine Figure 3As shown, in this embodiment, the bottom of the cylinder body 31 is provided with a mounting hole 313 for installing the sealing assembly 4, and the sealing assembly 4 includes a sealing member 41, a sealing spring 42, a locking screw sleeve 43 and a U-shaped sealing ring 44 which are sequentially sleeved on the valve stem 5 from bottom to top. The connecting member 2 is threadedly connected to the locking screw sleeve 43 through the mounting hole 313, and a second sealing ring 45 is provided between the connecting member 2 and the locking screw sleeve 43. The two ends of the sealing spring 42 abut against the sealing member 41 and the locking screw sleeve 43, and the sealing spring 42 gives axial pressure to the sealing member 41, and the connecting member 2 is screwed to the locking screw sleeve 43. Part 2 is provided with a receiving groove 21 for installing a sealing part 41, and an internal thread for threadedly connecting a locking screw sleeve 43 is provided at the opening of the receiving groove 21. The locking screw sleeve 43 and the connecting part 2 are provided with a first limiting portion 431 and a second limiting portion 22 for limiting. An elastic gasket is provided between the first limiting portion 431 and the cylinder body 31, and the second limiting portion 22 abuts against the bottom surface of the cylinder body 31, and a third sealing ring 46 is provided between the second limiting portion 22 and the cylinder body 31. The first limiting portion 431 is provided with a countersunk groove 432 for installing a U-shaped sealing ring 44.

[0031] Combine Figure 4 As shown, in this embodiment, the first air hole 12 and the second air hole 13 are provided with threaded holes 14 for external air source pipelines, and the cylinder body 31 is provided with connecting holes 15 for fixing the pneumatic controller on both sides of the first air hole 12 and the second air hole 13. The threaded holes 14 support a separate air source pipeline for an external air source, and the connecting holes 15 support the installation of a pneumatic controller, so that the angle seat valve can choose to install an independent air source pipeline or an integrated pneumatic controller.

[0032] Combine Figure 5 As shown, in this embodiment, the cylinder head 32 is provided with a window member 36, and the valve stem 5 is provided with an indicator rod 37 in the direction of the window member 36. The window member 36 is made of transparent plastic and is threadedly connected to the top of the cylinder head 32. A fourth sealing ring 38 is provided between the window member 36 and the cylinder head 32. The indicator rod 37 can be clearly seen through the window member 36, so as to judge the relative position of the valve core 6 in the valve body 1, thereby realizing the visualization of the working status of the angle seat valve.

[0033] like Figure 1 、 2 As shown, the utility model also discloses an embodiment of a normally closed angle seat valve, wherein a cylinder spring 39 is provided between the piston ring 34 and the cylinder cover 32, the opening of the annular portion 331 of the piston 33 is facing the cylinder cover 32, and one end of the cylinder spring 39 is sleeved in the annular portion 331, and the other end abuts against the cylinder cover 32. The cylinder spring 39 applies a force to the valve stem 5 toward the valve body 1, so that the valve core 6 is always in a closed state.

[0034] like Figure 6As shown, the utility model also discloses an embodiment of a normally open structure angle seat valve, wherein a cylinder spring 39 is provided between the piston ring 34 and the cylinder body 31, the opening of the annular portion 331 of the piston 33 is facing the direction of the cylinder body 31, and one end of the cylinder spring 39 is sleeved in the annular portion 331, and the other end abuts against the cylinder body 31. The cylinder spring 39 applies a force to the valve stem 5 toward the cylinder assembly 3, so that the valve core 6 is always in an open state.

[0035] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A plastic cylinder structure based on an angle seat valve, comprising a valve body (1), a connecting member (2), a cylinder assembly (3), a sealing assembly (4), a valve stem (5) and a valve core (6), wherein the valve body (1) is connected to the cylinder assembly (3) via the connecting member (2), the connecting member (2) is slidably connected to the valve stem (5) for controlling flow through the sealing assembly (4), and one end of the valve stem (5) is connected to the valve core (6), characterized in that: The cylinder assembly (3) comprises a cylinder body (31), a cylinder head (32), a piston (33) and a piston ring (34). The cylinder body (31) and the cylinder head (32) are combined to form a piston chamber (11). A piston (33) connected to a valve stem (5) is slidably connected in the piston chamber (11). The cylinder body (31) is provided with a first air hole (12) and a second air hole (13) connected to the piston chamber (11). A piston ring (34) sealed with the piston (33) is provided between the first air hole (12) and the second air hole (13).

2. A plastic cylinder structure based on an angle seat valve according to claim 1, characterized in that: The cylinder body (31) is provided with a threaded portion (311) and a stepped surface (312); the cylinder head (32) is provided with a stud portion (321) adapted to the threaded portion (311); the cylinder head (32) is threadedly connected to the cylinder body (31) via the stud portion (321); the piston ring (34) is clamped between the end face of the stud portion (321) and the stepped surface (312); and the piston (33) is provided with a circular ring portion (331) for sleeve-fitting the piston ring (34).

3. A plastic cylinder structure based on an angle seat valve according to claim 2, characterized in that: The stud portion (321) is provided with circumferentially distributed air-permeable grooves (322), and the first air hole (12) is connected to the piston cavity (11) through the air-permeable grooves (322).

4. A plastic cylinder structure based on an angle seat valve according to claim 3, characterized in that: The bottom of the cylinder body (31) is provided with a mounting hole (313) for mounting a sealing assembly (4). The sealing assembly (4) comprises a sealing member (41), a sealing spring (42), a locking screw sleeve (43) and a U-shaped sealing ring (44) which are sequentially sleeved on the valve stem (5) from bottom to top. The connecting member (2) passes through the mounting hole (313) and is threadedly connected to the locking screw sleeve (43).

5. The plastic cylinder structure based on the angle seat valve according to claim 4, characterized in that: The connecting member (2) is provided with a receiving groove (21) for installing a sealing member (41); an internal thread for threadedly connecting a locking screw sleeve (43) is provided at the opening of the receiving groove (21); and the locking screw sleeve (43) and the connecting member (2) are provided with a first limiting portion (431) and a second limiting portion (22) for limiting positions.

6. The plastic cylinder structure based on the angle seat valve according to claim 2, characterized in that: A cylinder spring (39) is provided between the piston ring (34) and the cylinder body (31) / cylinder cover (32), and the cylinder spring (39) is sleeved in the annular portion (331).

7. The plastic cylinder structure based on the angle seat valve according to claim 1, characterized in that: The first air hole (12) and the second air hole (13) are provided with threaded holes (14) for connecting to an external air source pipeline, and the cylinder body (31) is provided with connecting holes (15) for fixing the pneumatic controller on both sides of the first air hole (12) and the second air hole (13).

8. The plastic cylinder structure based on the angle seat valve according to claim 1, characterized in that: The cylinder cover (32) is provided with a window member (36), and the valve stem (5) is provided with an indicator rod (37) in a direction facing the window member (36).

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