Loose joint type check valve

Abstract

The utility model discloses a loose joint type check valve, which belongs to the technical field of check valves, and comprises a valve seat, a valve cover, a valve body assembly, a slow descending assembly and a mounting assembly, the valve body assembly comprises a valve block, two spiral grooves with opposite directions are arranged at the outer end of a valve rod, and the valve cover is arranged in the valve block. Meanwhile, two abutting columns are installed on the inner side of the through hole in the fixing disc and are in sliding connection with the spiral groove, when the valve rod is reset through the acting force of the telescopic spring, the valve rod slides in the through hole and drives the valve block to rotate at the same time, the speed of abutting between the sealing ring and the sealing inclined face can be reduced through movement and rotation, and therefore impact force is reduced, and the service life of the valve is prolonged. Meanwhile, due to the fact that the sealing ring rotates when abutting against the sealing inclined face, dirt on the surface of the sealing ring can be scraped by the sealing ring, a gap is prevented from being generated when the sealing ring abuts against the sealing inclined face due to the dirt, and the sealing performance can be improved.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and more specifically, to a union-type check valve. Background Technology

[0002] A union-type check valve is a type of check valve with a union structure. It not only has the function of a check valve (preventing backflow of the medium) but is also easy to install and disassemble. It is suitable for pipeline systems that require frequent maintenance or replacement. The union nut connection does not require welding or flange fixing and can be quickly disassembled for easy maintenance or replacement without affecting the overall pipeline structure. It is widely used in water supply, HVAC, chemical and other fields.

[0003] Chinese Patent Publication No. CN208381398U discloses a union-type check valve. In use, a first connector and a second connector are connected to a water pipe. When water flows in from the first connector, the high pressure of the water flow causes the baffle to separate from the fixed plate, allowing water to flow through the cylinder into the second connector, completing the water flow. When the inflow pressure decreases, the baffle, under the combined action of the first and second springs, abuts against the fixed plate, effectively preventing backflow. Simultaneously, the anti-slip block prevents the insert rod from slipping off the moving rod. This utility model features a novel structure, conveniently achieving an elastic blocking effect and a significant anti-backflow effect in a union-type check valve through a simple design.

[0004] When the liquid inside the pipeline stops flowing, the valve block inside the spring-loaded check valve will reset and prevent backflow through the force of the spring. However, if the reset speed is too fast, repeated high-speed impacts over a long period of time can easily cause deformation, wear, or damage to the sealing surface of the check valve block, which will affect the sealing performance in the long term. At the same time, the impact can also easily cause deformation of the sealing material, resulting in leakage.

[0005] Therefore, a union-type check valve is proposed to address the above problems. Utility Model Content

[0006] 1. Technical problems to be solved

[0007] This utility model provides a union-type check valve, which can improve the problems existing in related technologies: the valve block inside the spring-type check valve is reset by the force of the spring to prevent backflow, but if the reset speed is too fast, repeated high-speed impacts over a long period of time can easily cause deformation, wear or damage to the sealing surface of the check valve block, which will affect the sealing performance in the long term. At the same time, the impact can also easily cause deformation of the sealing material, resulting in leakage.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] This application provides a union-type check valve, including a valve seat and a valve cover, as well as a valve body assembly, a slow-closing assembly, and a mounting assembly. The valve body assembly includes a valve block with a sealing ring fitted at its outer end. The slow-closing assembly includes a telescopic spring and a valve stem. The telescopic spring is fitted at the outer end of the valve stem, and one end of the valve stem is fixedly connected to the valve block. The outer end of the valve stem has two helical grooves with opposite directions of rotation. The mounting assembly includes a fixing plate with a through hole at its outer end. One end of the valve stem passes through the through hole, and two abutment posts adapted to the helical grooves are installed inside the through hole. The valve block is pushed by the force of the telescopic spring, causing the valve stem to move. The helical grooves abut against the abutment posts, causing the valve stem to rotate and the valve block to rotate, thus reducing the movement speed of the valve block.

[0011] The technical solutions described in this application embodiment have at least the following technical effects:

[0012] Two opposing spiral grooves are formed at the outer end of the valve stem. Two abutment posts are installed inside the through hole on the fixed plate. The abutment posts are slidably connected to the spiral grooves. When the valve stem is reset by the force of the telescopic spring, the valve stem slides in the through hole and drives the valve block to rotate. By moving and rotating, the speed when the sealing ring abuts against the sealing slope can be reduced, thereby reducing the impact force and improving the service life of the sealing components. At the same time, since the sealing ring rotates when it abuts against the sealing slope, it can also scrape the dirt on its surface, preventing dirt from creating a gap when the sealing ring abuts against the sealing slope, and also improving the sealing performance.

[0013] In some embodiments, the valve seat and valve cover are detachably connected by threads. The mounting assembly, valve body assembly and slow-closing assembly are all located inside the valve seat. An output pipe is provided inside the valve cover. One end of the output pipe extends through the valve cover to the outside. A union is installed at one end of the output pipe. The output pipe is connected to the inside of the valve seat.

[0014] In some embodiments, a sealing gasket is provided at the outer end of the output pipe, the sealing gasket abuts against the outer end of the fixed plate, the output pipe forms a seal between the sealing gasket and the fixed plate, and the fixed plate is fixedly connected to the inner wall of the valve seat.

[0015] In some embodiments, the mounting assembly further includes a sealing ring, which is fitted between the outer end of the fixed plate and the inner wall of the valve seat to form a seal. The inner side of the fixed plate is provided with annularly distributed flow channels. The inner side of the through hole has two movable grooves. The outer end of the abutment post is fixedly connected with a bolt. The abutment post extends to the inner side of the through hole through a threaded connection between the bolt and the inner wall of the movable groove.

[0016] In some embodiments, the slow-descent assembly further includes a mounting plate, which is sleeved on the outer end of the valve stem. The outer end of the mounting plate has a slot adapted to the telescopic spring, and the two ends of the telescopic spring abut against the inner side of the fixed plate and the slot, respectively.

[0017] In some embodiments, the outer end of the valve block is provided with a positioning groove adapted to the mounting plate, and the outer end of the mounting plate abuts against the positioning groove.

[0018] In some embodiments, a sealing groove is provided at the outer end of the valve block, a support ring is fixedly installed at the outer end of the sealing groove, a support groove is provided on the inner side of the sealing ring, the sealing ring is installed on the inner side of the sealing groove by the support ring and the support groove, and a sealing inclined surface is provided on the inner side of the valve seat, the sealing ring forms a sealing check by abutting against the sealing inclined surface. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the valve body assembly structure of this utility model;

[0022] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0023] Figure 5 This is a schematic diagram of the installation component structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the abutment column structure of this utility model.

[0025] Explanation of the labels in the diagram:

[0026] 1. Valve seat;

[0027] 2. Valve cover;

[0028] 3. Union joint;

[0029] 4. Output tube;

[0030] 5. Mounting components; 51. Mounting plate; 52. Sealing ring; 53. Abutment post; 54. Through hole; 55. Bolt;

[0031] 6. Valve body assembly; 61. Valve block; 62. Sealing groove; 63. Support ring; 64. Sealing ring; 65. Support groove; 66. Positioning groove;

[0032] 7. Soft-close assembly; 71. Mounting plate; 72. Telescopic spring; 73. Valve stem; 74. Spiral groove; 75. Slot;

[0033] 8. Sealing gasket;

[0034] 9. Seal bevel. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0036] Please see Figure 1 - Figure 6 A swivel-type check valve includes a valve seat 1 and a valve cover 2, as well as a valve body assembly 6, a slow-closing assembly 7, and a mounting assembly 5. The valve body assembly 6 includes a valve block 61, with a sealing ring 64 fitted on the outer end of the valve block 61. The slow-closing assembly 7 includes a telescopic spring 72 and a valve stem 73. The telescopic spring 72 is fitted on the outer end of the valve stem 73, and one end of the valve stem 73 is fixedly connected to the valve block 61. Two spiral grooves 74 with opposite directions are opened on the outer end of the valve stem 73. The mounting assembly 5 includes a fixing plate 51, with a through hole 54 opened on the outer end of the fixing plate 51. One end of the valve stem 73 passes through the through hole 54, and two abutment posts 53 adapted to the spiral grooves 74 are installed inside the through hole 54. The valve block 61 is pushed by the force of the telescopic spring 72, which drives the valve stem 73 to move. The spiral grooves 74 abut against the abutment posts 53, causing the valve stem 73 to drive the valve block 61 to rotate. The valve block 61 rotates and moves, thus reducing its movement speed.

[0037] The check valve in this design is a spring-loaded type, primarily installed on pipelines transporting liquids. Traditional spring-loaded check valves slide linearly during reset and check valve operation. When a valve upstream of the check valve suddenly closes, the resulting water hammer effect first impacts the valve, then rebounds and impacts the sealing block on the check valve. The combined force of the spring and water hammer easily accelerates the sealing block, causing it to impact the valve seat and reducing the lifespan of various components. This design uses a deceleration structure to reduce the speed at which the valve contacts the seal. Two opposing spiral grooves 74 are formed at the outer end of the valve stem 73, and a through hole is located on the fixed plate 51. Two abutment posts 53 are installed on the inner side of 54. The abutment posts 53 are slidably connected to the slot 75. When the valve stem 73 is reset by the force of the telescopic spring 72, the valve stem 73 slides in the through hole 54 and also drives the valve block 61 to rotate. By moving and rotating, the speed when the sealing ring 64 abuts against the sealing slope 9 can be reduced, thereby reducing the impact force and improving the service life of the sealing components. At the same time, since the sealing ring 64 rotates when it abuts against the sealing slope 9, the sealing ring 64 can also scrape the dirt on its surface, preventing the dirt from creating a gap when the sealing ring 64 abuts against the sealing slope 9, and also improving the sealing performance.

[0038] Please see Figure 1 and Figure 2 The valve seat 1 and valve cover 2 are detachably connected by threads. The mounting component 5, valve body component 6 and slow-closing component 7 are all located inside the valve seat 1. An output pipe 4 is provided inside the valve cover 2. One end of the output pipe 4 passes through the valve cover 2 and extends to the outside. A union 3 is installed at one end of the output pipe 4. The output pipe 4 is connected to the inside of the valve seat 1.

[0039] A sealing gasket 8 is provided at the outer end of the output pipe 4. The sealing gasket 8 abuts against the outer end of the fixed plate 51. The output pipe 4 forms a seal between the sealing gasket 8 and the fixed plate 51. The fixed plate 51 is fixedly connected to the inner wall of the valve seat 1.

[0040] In this design, the valve seat 1, valve cover 2, and output pipe 4 form the outer shell of the check valve. The output pipe 4 is located inside the valve seat 1, and its outer end extends through the valve cover 2 to the outside. The diameter of the other end of the output pipe 4 is larger than the inner diameter of the valve cover 2. When the valve cover 2 is threadedly connected to the valve seat 1, the other end of the output pipe 4 will abut against the outer end of the internal mounting component 5 of the valve seat 1 through the sealing gasket 8, thereby connecting the output pipe 4 and the valve seat 1. The valve cover 2 is mainly used to install the output pipe 4.

[0041] At the other end of the output pipe 4, a union 3 is installed. The union 3 is mainly used to connect the pipe, so that it can be connected by threads. It can be easily removed during maintenance. The union 3 can also be installed at the inlet end of the valve seat 1, so that it can be connected at both ends. It can also be installed by clamp, so that the valve seat 1 is the inlet and the output pipe 4 is the outlet, allowing only unidirectional flow.

[0042] Please see Figure 2 - Figure 6 The mounting assembly 5 also includes a sealing ring 52, which is fitted between the outer end of the fixed plate 51 and the inner wall of the valve seat 1 to form a seal. The inner side of the fixed plate 51 is provided with annularly distributed flow channels. Two movable grooves are opened inside the through hole 54. The outer end of the abutment post 53 is fixedly connected with a bolt 55. The abutment post 53 extends to the inner side of the through hole 54 through the bolt 55 threaded connection to the inner wall of the movable groove.

[0043] The slow-descent assembly 7 also includes a mounting plate 71, which is sleeved on the outer end of the valve stem 73. The outer end of the mounting plate 71 has a slot 75 that is adapted to the telescopic spring 72. The two ends of the telescopic spring 72 abut against the inner side of the fixed plate 51 and the slot 75, respectively.

[0044] The valve block 61 has a positioning groove 66 at its outer end that is compatible with the mounting plate 71, and the outer end of the mounting plate 71 abuts against the positioning groove 66.

[0045] A sealing groove 62 is provided at the outer end of the valve block 61, and a support ring 63 is fixedly installed at the outer end of the sealing groove 62. A support groove 65 is provided on the inner side of the sealing ring 64. The sealing ring 64 is installed on the inner side of the sealing groove 62 by the support ring 63 and the support groove 65. A sealing inclined surface 9 is provided on the inner side of the valve seat 1. The sealing ring 64 forms a sealing and backflow prevention by abutting against the sealing inclined surface 9.

[0046] In this design, the mounting component 5, valve body assembly 6, and slow-closing component 7 are all located inside the valve seat 1. The mounting component 5 is primarily used to install the slow-closing component 7 and valve body assembly 6. The fixing plate 51 is fixed to the inner wall of the valve seat 1 via clips or a bracket. A sealing ring 52 is fitted around the fixing plate 51, abutting against the inner wall of the valve seat 1 to seal the space between the fixing plate 51 and the inner wall of the valve seat 1. A through hole 54 is formed at the center of the fixing plate 51, primarily for installing the abutment post 53 and allowing the valve stem 73 to slide. The abutment post 53 has an arc-shaped outer surface and two symmetrically distributed movable grooves inside the through hole 54. The movable grooves have internal threads. A bolt 55 is connected to the outer end of the abutment post 53. The bolt 55 is threadedly connected to the movable groove. The abutment post 53 is installed inside the movable groove by the bolt 55. Rotating the bolt 55 can adjust the length of the abutment post 53 extending into the through hole 54, thereby adjusting the resistance when the abutment post 53 slides into the spiral groove 74, achieving the purpose of adjusting the deceleration strength, so that it can be adjusted according to different working conditions and adapted to different scenarios.

[0047] The valve block 61 serves as a check valve. A sealing groove 62 is formed at the outer end of the valve block 61, and a support ring 63 is fixed inside the sealing groove 62. An annular support groove 65 is formed inside the sealing ring 64 and matches the support ring 63. The sealing ring 64 is installed inside the sealing groove 62 by the support groove 65 and the support ring 63. The support ring 63 supports the sealing ring 64, which can provide support when the sealing ring 64 is impacted, thereby improving the structural strength of the sealing ring 64. A sealing slope 9 is formed inside the inlet of the valve seat 1. When the valve block 61 drives the sealing ring 64 to abut against the sealing slope 9, a seal can be formed between the sealing ring 64 and the sealing slope 9, thereby achieving a check valve effect.

[0048] The slow-descent component 7 in this design is mainly used to drive the valve block 61 to move and rotate. The valve stem 73 is fixed to the valve block 61, and the other end of the valve stem 73 passes through the through hole 54. Two spiral grooves 74 are opened on the outer end of the valve stem 73, and the spiral directions of the two spiral grooves 74 are set in opposite directions. At the same time, a telescopic spring 72 and a mounting plate 71 are respectively sleeved on the outer end of the valve stem 73. The outer end of the mounting plate 71 is opened with a slot 75, and one end of the telescopic spring 72 can be inserted into the slot 75. The valve block 61 is fixed, while the other end of the telescopic spring 72 abuts against the fixed plate 51. A positioning groove 66 is opened at the outer end of the valve block 61. Both the positioning groove 66 and the bottom of the mounting plate 71 are smooth surfaces, allowing them to slide. When the valve block 61 rotates, one end of the telescopic spring 72 will not rub against the valve block 61, thus preventing it from forming an obstruction. The spiral groove 74 is adapted to the abutment post 53. When the valve stem 73 passes through the through hole 54, the abutment post 53 will be engaged inside the spiral groove 74.

[0049] When the valve block 61 is reset by the force of the telescopic spring 72, the valve stem 73 will rotate and move along the path of the spiral groove 74 due to the restraint of the abutment post 53 being stuck in the spiral groove 74. The friction between the abutment post 53 and the inner side of the spiral groove 74 can reduce the movement speed of the valve block 61, preventing the valve block 61 from quickly abutting against the sealing slope 9 inside the valve seat 1, reducing the impact force and extending its service life. At the same time, since the valve block 61 is rotating, the sealing ring 64 will rotate and scrape the inner side of the sealing slope 9 before abutting against it, removing the dirt attached to the inner side. This can prevent the formation of a gap between the sealing ring 64 and the sealing slope 9 due to dirt, thereby improving its sealing performance.

[0050] Working principle: When using this device, it can be installed on the pipeline through the union joint 3. When the flow in the pipeline stops or reverses, the valve block 61 is reset by the force of the telescopic spring 72. At this time, the valve stem 73 will rotate and move along the path of the spiral groove 74 due to the restriction of the abutment column 53. The friction between the abutment column 53 and the inner side of the spiral groove 74 can reduce the moving speed of the valve block 61. At the same time, the rotation of the valve block 61 will form a rotating scraping effect on the inner side of the sealing slope 9, preventing dirt from forming a gap between the sealing ring 64 and the sealing slope 9. Finally, a sealing check is formed between the sealing ring 64 and the sealing slope 9.

Claims

1. A union-type check valve, comprising a valve seat (1) and a valve cover (2), characterized in that, Also includes: Valve body assembly (6), the valve body assembly (6) includes valve block (61), and a sealing ring (64) is sleeved on the outer end of the valve block (61); The slow-descent assembly (7) includes a telescopic spring (72) and a valve stem (73). The telescopic spring (72) is sleeved on the outer end of the valve stem (73). One end of the valve stem (73) is fixedly connected to the valve block (61). Two spiral grooves (74) with opposite directions of rotation are opened on the outer end of the valve stem (73). The mounting assembly (5) includes a fixing plate (51), the fixing plate (51) has a through hole (54) at its outer end, one end of the valve stem (73) passes through the through hole (54), and two abutment posts (53) adapted to the spiral groove (74) are installed inside the through hole (54). The valve block (61) is pushed by the force of the telescopic spring (72) to drive the valve stem (73) to move. The spiral groove (74) abuts against the abutting post (53) to make the valve stem (73) drive the valve block (61) to rotate. The valve block (61) rotates and moves to reduce its speed.

2. The union-type check valve according to claim 1, characterized in that: The valve seat (1) and valve cover (2) are detachably connected by threads. The mounting assembly (5), valve body assembly (6) and slow-closing assembly (7) are all located inside the valve seat (1). An output pipe (4) is provided inside the valve cover (2). One end of the output pipe (4) extends through the valve cover (2) to the outside. A union connector (3) is installed at one end of the output pipe (4). The output pipe (4) is connected to the inside of the valve seat (1).

3. A union-type check valve according to claim 2, characterized in that: The outer end of the output pipe (4) is provided with a sealing gasket (8), which abuts against the outer end of the fixed plate (51). The output pipe (4) forms a seal between the sealing gasket (8) and the fixed plate (51). The fixed plate (51) is fixedly connected to the inner wall of the valve seat (1).

4. A union-type check valve according to claim 1, characterized in that: The mounting assembly (5) also includes a sealing ring (52), which is fitted between the outer end of the fixed plate (51) and the inner wall of the valve seat (1) to form a seal. The inner side of the fixed plate (51) is provided with annularly distributed flow channels. The inner side of the through hole (54) has two movable grooves. The outer end of the abutment post (53) is fixedly connected with a bolt (55). The abutment post (53) is threadedly connected to the inner wall of the movable groove through the bolt (55) and extends to the inner side of the through hole (54).

5. A union-type check valve according to claim 4, characterized in that: The slow-descent assembly (7) also includes a mounting plate (71), which is sleeved on the outer end of the valve stem (73). The outer end of the mounting plate (71) has a slot (75) that is adapted to the telescopic spring (72). The two ends of the telescopic spring (72) abut against the inner side of the fixed plate (51) and the slot (75), respectively.

6. A union-type check valve according to claim 5, characterized in that: The valve block (61) has a positioning groove (66) at its outer end that is compatible with the mounting plate (71), and the outer end of the mounting plate (71) abuts against the positioning groove (66).

7. A union-type check valve according to claim 1, characterized in that: The valve block (61) has a sealing groove (62) at its outer end. A support ring (63) is fixedly installed at the outer end of the sealing groove (62). A support groove (65) is provided on the inner side of the sealing ring (64). The sealing ring (64) is installed on the inner side of the sealing groove (62) by the support ring (63) and the support groove (65). A sealing inclined surface (9) is provided on the inner side of the valve seat (1). The sealing ring (64) forms a sealing and anti-reverse flow by abutting against the sealing inclined surface (9).

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