Limiting flange structure of needle valve

Abstract

The utility model relates to the technical field of limiting flanges, in particular to a needle valve limiting flange structure which comprises a connecting pipe A, a middle gland, a limiting assembly, a flange B, a connecting assembly A and a connecting assembly. The connecting pipe A is rotationally connected with the flange A and is sleeved with a fixing ring. The middle gland sleeves the connecting pipe A, is positioned on one side, far away from the flange A, of the fixing ring, and is in sliding connection with the connecting pipe A. The limiting assembly is connected with the flange A and the connecting pipe A; and a connecting pipe B is arranged on the flange B, sleeves the connecting pipe A and is in sliding connection with the connecting pipe A. The connecting assembly A is connected with the flange B and the fixing ring. The connecting assembly is connected with the fixing ring, the middle gland and the flange B so as to conduct anti-disengaging limiting when the connecting pipe A and the connecting pipe B slide relatively. According to the needle valve, the angle of the needle valve shell can be conveniently adjusted, the needle valve is prevented from inclining, and operation is easy and convenient when the needle valve is disassembled and assembled.

Description

Technical Field

[0001] The utility model relates to the technical field of limiting flanges, in particular to a needle valve limiting flange structure. Background Art

[0002] A needle valve is a precisely adjustable valve. When connecting a needle valve to an external pipe, a stop flange is typically used. This flange is a pipe connection device primarily used to compensate for pipe displacement caused by factors such as temperature fluctuations, mechanical vibration, and foundation settlement. Its position-limiting function effectively protects the piping system from damage caused by excessive displacement.

[0003] The technical solution disclosed in the Chinese patent with authorization announcement number CN217736600U controls the telescopic distance of the telescopic tube and the limiting tube in the telescopic mechanism and the limiting mechanism to prevent the pipeline from being disconnected at the flange joint due to excessive displacement. The elastic force generated by the elasticity of the spring during contraction causes the second connecting tube and the first connecting tube to respectively drive the second rubber sleeve and the first rubber sleeve to continuously contact the inner diameter of the pipeline and the valve, thereby preventing the rubber plug at the flange connection between the first flange and the pipeline or the second flange and the valve from being directly impacted, thereby preventing damage and leakage.

[0004] However, this device still has some shortcomings: the limiting flange is connected by a guide bolt, and multiple nuts need to be assembled during operation, which is inconvenient to operate; and the first flange and the second flange in the limiting flange cannot be rotated at any angle. During actual connection, it is easy to be restricted by the flange hole position on the pipeline, causing the needle valve to be misaligned after installation. Utility Model Content

[0005] The utility model aims to solve the problems existing in the background technology and proposes a needle valve limiting flange structure.

[0006] The technical solution of the utility model is a needle valve limiting flange structure, which comprises a connecting pipe A, the connecting pipe A rotates the connecting flange A, and a fixing ring is sleeved on the connecting pipe A.

[0007] The intermediate gland is sleeved on the outside of the connecting pipe A and is located on the side of the fixing ring away from the flange A. The intermediate gland is slidably connected to the connecting pipe A.

[0008] The limiting assembly connects flange A and connecting pipe A so as to rotate flange A when the rotation restriction of the two is released.

[0009] Flange B, flange B is provided with connecting pipe B, connecting pipe B is sleeved on connecting pipe A and slidably connected therewith.

[0010] Connecting component A, connecting component A connects flange B and fixing ring.

[0011] And a connecting component, which connects the fixing ring, the intermediate pressure cover and the flange B to prevent the connecting pipe A and the connecting pipe B from sliding relative to each other.

[0012] Preferably, the limiter assembly includes a tooth groove, a clamping block, and a stud. Connecting tube A is provided with a coaxial annular groove, the tooth groove being located within the annular groove and coaxial with connecting tube A. Flange A is provided with a chute communicating with its inner bore, the clamping block being located within the chute and sliding therewith. The stud is rotationally connected to flange A. One end of the stud extending outside flange A is connected to a knob, and the stud is inserted into the clamping block and threadedly connected therewith. Rotating the stud causes the clamping block to slide.

[0013] Preferably, the connecting assembly A includes bolts and nuts, and the bolts pass through flange B and the intermediate pressure cover in sequence along the end of flange B away from flange A, and the nuts are spirally connected to the bolts on the side of the intermediate pressure cover away from flange B and fit with the end face of the intermediate pressure cover.

[0014] Preferably, a sealing ring coaxial with the intermediate gland is provided on the intermediate gland to improve the sealing performance of the connection between the connecting pipe A, the intermediate gland and the connecting pipe B.

[0015] Preferably, the connecting assembly includes a limiting rod, a slider, a wedge-shaped block, a button, and a spring. A limiting ring is provided at one end of the limiting rod. A cylindrical cavity and a cylindrical groove are provided within the limiting rod. The limiting rod is provided with two through-holes communicating with the cylindrical cavity, and the two through-holes are radially distributed along the limiting rod. The slider is positioned within the cylindrical cavity and slidably connected thereto. Two sets of tensioning springs are provided within the slider, and the two sets of tensioning springs are radially distributed along the limiting rod. The wedge-shaped block is inserted into the slider and connected to the tensioning springs. The wedge-shaped blocks extend through the through-holes on corresponding sides, and the flat surfaces of the two sets of wedge-shaped blocks abut against the retaining ring and the side of the intermediate gland near flange A, respectively. The button is positioned within the cylindrical groove and slidably connected to its inner wall. A connecting rod is provided on the button, which is inserted into the cylindrical cavity and connected to the slider. The spring is positioned within the cylindrical groove, sheathed around the connecting rod, and its ends abut against the inner wall of the cylindrical groove and the button, respectively.

[0016] Preferably, a beetle rebounder plug-in is provided at the bottom of the slider, and a beetle rebounder female buckle is provided at the bottom of the cylindrical cavity.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] By setting the connecting pipe A and flange A into a rotationally connected structure, and the two are connected by a limit assembly, when the rotation limit between the two is released, flange A and connecting pipe A can rotate relative to each other. This structure is conducive to adjusting the flip angle of the needle valve when the flange A on the limit flange deviates from the flange hole on the external pipe, thereby straightening the needle valve; by setting the connecting assembly A and the connecting assembly B, the connecting assembly A is used to connect and lock the flange B and the intermediate pressure cover to improve the sealing between the two and the connecting pipe A, and the connecting assembly B is used to limit the relative sliding of the connecting pipe A and the connecting pipe B to prevent the connecting pipe B from detaching from the connecting pipe A, and the insertion and disassembly operations of the connecting assembly B are simple and convenient. At the same time, the connecting assembly A can also form a limiting space between the intermediate pressure cover and the fixing ring to prevent the fixing ring from squeezing the wedge-shaped block on the connecting assembly to cause it to retract, thereby ensuring the assembly connection stability of this structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 Schematic diagram of the connection structure of various components of the utility model;

[0021] Figure 3 Schematic diagram of the connection structure between the connecting pipe A and the flange A;

[0022] Figure 4 Schematic diagram of the internal structure of the limit rod.

[0023] Figure markings: 1. Connecting pipe A; 2. Flange A; 3. Tooth groove; 4. Block; 5. Stud; 6. Fixing ring; 7. Intermediate pressure cover; 8. Flange B; 9. Connecting pipe B; 10. Locking bolt; 11. Sealing ring; 12. Limit rod; 121. Cylindrical cavity; 122. Through hole; 123. Cylindrical groove; 13. Slider; 14. Wedge-shaped block; 15. Button; 16. Connecting rod; 17. Spring; 18. Beetle rebounder plug-in; 19. Beetle rebounder female buckle. DETAILED DESCRIPTION

[0024] Example 1

[0025] like Figure 1-Figure 4As shown, the present invention proposes a needle valve limiting flange structure, including a connecting pipe A1, an intermediate pressure cover 7, a limiting assembly, a flange B8, a connecting assembly A and a connecting assembly B. The connecting pipe A1 rotates to connect the flange A2, and a fixing ring 6 is sleeved on the connecting pipe A1. The intermediate pressure cover 7 is sleeved on the outside of the connecting pipe A1 and is located on the side of the fixing ring 6 away from the flange A2. The intermediate pressure cover 7 is slidably connected to the connecting pipe A1. The limiting assembly connects the flange A2 and the connecting pipe A1, and the limiting assembly includes a tooth groove 3, a clamping block 4 and a stud 5. An annular groove coaxial with the connecting pipe A1 is provided on the connecting pipe A1, and the tooth groove 3 is located in the annular groove and is coaxial with the connecting pipe A1. A sliding groove connected to the inner hole of the flange A2 is provided on the flange A2, and the clamping block 4 is located in the sliding groove and slides with it. Stud 5 is rotatably connected to flange A2. The end of stud 5 extending outside flange A2 is connected to a knob. Stud 5 is inserted into and threadedly connected to block 4. Rotating stud 5 causes block 4 to slide, allowing flange A2 to rotate while releasing the rotational restraints. A connecting pipe B9 is provided on flange B8, which is sleeved over and slidably connected to connecting pipe A1. A coaxial sealing ring 11 is provided on intermediate gland 7 to enhance the sealing between connecting pipe A1, intermediate gland 7, and connecting pipe B9. Connecting assembly A connects flange B8 to retaining ring 6. Connecting assembly A comprises a bolt and a nut. The bolt extends through flange B8 and intermediate gland 7, sequentially, along the end of flange B8 facing away from flange A2. The nut is threadedly connected to the bolt on the side of intermediate gland 7 facing away from flange B8 and engages the end face of intermediate gland 7. The connecting assembly includes a stopper 12, a slider 13, a wedge-shaped block 14, a button 15, and a spring 17. A limiting ring is provided at one end of the limiting rod 12. A cylindrical cavity 121 and a cylindrical groove 123 are provided within the limiting rod 12. Two through-holes 122 are provided on the limiting rod 12, communicating with the cylindrical cavity 121. The two through-holes 122 are radially distributed along the limiting rod 12. A slider 13 is located within and slidably connected to the cylindrical cavity 121. Two sets of tensioning springs are provided within the slider 13, radially distributed along the limiting rod 12. Wedge-shaped clamps 14 are inserted into the slider 13 and connected to the tensioning springs. These wedge-shaped clamps 14 extend through the through-holes 122 on corresponding sides, and the flat surfaces of the two sets of wedge-shaped clamps 14 respectively abut against the side of the retaining ring 6 and the intermediate gland 7 near flange A2. A button 15 is located within and slidably connected to the inner wall of the cylindrical groove 123. A connecting rod 16 is provided on the button 15, which is inserted into the cylindrical cavity 121 and connected to the slider 13. Spring 17 is located within cylindrical groove 123 and is sleeved onto the exterior of connecting rod 16, with its ends respectively contacting the inner wall of cylindrical groove 123 and button 15. Connecting assembly B connects retaining ring 6, intermediate gland 7, and flange B8 to prevent disengagement when connecting pipes A1 and B9 slide relative to each other.

[0026] In this embodiment, during the actual connection, first put the intermediate gland 7 on the connecting pipe A1, then press the sealing ring 11, then put the connecting pipe B9 on the connecting pipe A1 and press the sealing ring 11, then use bolts and nuts to lock the intermediate gland 7 and flange B8 to improve the sealing between the connecting pipe A1, the intermediate gland 7 and the connecting pipe B9, then pass the straight rod body of the limiting rod 12 through the flange B8, the intermediate gland 7 and the fixing ring 6 in sequence until the wedge-shaped block 14 at the middle waist position is in contact with the end of the intermediate gland 7 close to the flange A2 after popping out, and at this time, the wedge-shaped block 14 at the end of the limiting rod 12 away from its limiting ring is close to the fixing ring 6. One end of the proximal flange A2 pops out and fits with its end face, and the assembly of the entire limit flange is completed at this time. When disassembling, you only need to press the limit rod 12 to make the slider 13 slide. At this time, the wedge-shaped block 14 automatically retracts into the slider 13 after the inclined surface hits the edge of the through hole 122. You can push the limit rod 12 to remove it, and then remove the bolts and nuts to disassemble the limit flange. When connecting the needle valve and the external pipeline with this limit flange, if the needle valve is not in the correct position, you can rotate the stud 5 to drive the block 4 to slide out of the tooth groove 3. At this time, you can rotate the needle valve at will until it is straightened. After straightening, push the block 4 into the tooth groove 3 to lock its current state.

[0027] Example 2

[0028] like Figure 4 As shown, the needle valve limiting flange structure proposed by the present invention is compared with the first embodiment. A beetle rebounder plug-in 18 is provided at the bottom of the slider 13, and a beetle rebounder female buckle 19 is provided at the bottom of the cylindrical cavity 121.

[0029] In this embodiment, when disassembling the limit flange, after pressing the button 15 to retract the wedge-shaped block 14 into the slider 13, the beetle rebounder plug-in 18 and the beetle rebounder female buckle 19 on the slider 13 are locked together. At this time, there is no need to apply pressure to the button 15, and the limit rod 12 can be easily removed.

[0030] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A needle valve limit flange structure, characterized in that: include The connecting pipe A (1) is rotatably connected to the flange A (2), and a fixing ring (6) is sleeved on the connecting pipe A (1); An intermediate gland (7), which is sleeved on the outside of the connecting pipe A (1) and located on a side of the fixing ring (6) away from the flange A (2), and the intermediate gland (7) is slidably connected to the connecting pipe A (1); A limit assembly, the limit assembly connects the flange A (2) and the connecting pipe A (1) so as to rotate the flange A (2) when the rotation restriction of the two is released; Flange B (8), a connecting pipe B (9) is arranged on the flange B (8), and the connecting pipe B (9) is sleeved on the connecting pipe A (1) and slidably connected thereto; A connecting component A, connecting the flange B (8) and the fixing ring (6); And a connecting component B, which connects the fixing ring (6), the intermediate pressure cover (7) and the flange B (8) to prevent the connection pipe A (1) and the connection pipe B (9) from sliding relative to each other.

2. A needle valve limiting flange structure according to claim 1, characterized in that: The limiting assembly comprises a tooth groove (3), a clamping block (4) and a stud (5); a coaxial annular groove is provided on the connecting pipe A (1), the tooth groove (3) is located in the annular groove and is coaxial with the connecting pipe A (1); a sliding groove is provided on the flange A (2) and is connected to the inner hole thereof, the clamping block (4) is located in the sliding groove and slides with the flange A (2); the stud (5) is rotatably connected to the flange A (2), one end of the stud (5) extending out of the flange A (2) is connected to the knob, and the stud (5) is inserted into the clamping block (4) and is spirally connected with the flange A (2), and the clamping block (4) is pushed to slide by rotating the stud (5).

3. A needle valve limiting flange structure according to claim 1, characterized in that: The connection assembly A comprises bolts and nuts. The bolts pass through the flange B (8) and the intermediate gland (7) in sequence along the end of the flange B (8) away from the flange A (2). The nuts are spirally connected to the bolts on the side of the intermediate gland (7) away from the flange B (8) and fit with the end surface of the intermediate gland (7).

4. A needle valve limiting flange structure according to claim 1, characterized in that: A sealing ring (11) coaxial with the intermediate gland (7) is provided to improve the sealing performance of the connection between the connecting pipe A (1), the intermediate gland (7) and the connecting pipe B (9).

5. The needle valve limiting flange structure according to claim 1, characterized in that: The connecting assembly B comprises a limiting rod (12), a slider (13), a wedge-shaped block (14), a button (15) and a spring (17); a limiting ring is arranged at one end of the limiting rod (12), a columnar cavity (121) and a columnar groove (123) are arranged in the limiting rod (12), two through holes (122) connected with the columnar cavity (121) are arranged on the limiting rod (12), and the two through holes (122) are distributed along the radial direction of the limiting rod (12); the slider (13) is located in the columnar cavity (121) and is slidably connected thereto, two groups of tension springs are arranged in the slider (13), and the two groups of tension springs are distributed along the radial direction of the limiting rod (12); the wedge-shaped block (14) is inserted into the slider (1 3) and connected to the tensioning spring, the wedge-shaped blocks (14) extend out along the through holes (122) on the corresponding sides, and the planes of the two groups of wedge-shaped blocks (14) respectively abut against the fixing ring (6) and the side of the middle pressure cover (7) close to the flange A (2); the button (15) is located in the cylindrical groove (123) and is slidably connected to the inner wall thereof, a connecting rod (16) is arranged on the button (15), the connecting rod (16) is inserted into the cylindrical cavity (121) and connected to the slider (13); the spring (17) is located in the cylindrical groove (123), the spring (17) is sleeved on the outside of the connecting rod (16), and the two ends of the spring (17) respectively abut against the inner wall of the cylindrical groove (123) and the button (15).

6. A needle valve limiting flange structure according to claim 5, characterized in that: A beetle rebounder plug-in unit (18) is arranged at the bottom of the slider (13), and a beetle rebounder female buckle (19) is arranged at the bottom of the cylindrical cavity (121).

Images