Check valve

Abstract

The utility model discloses a check valve which comprises a valve body, a valve clack and a rocker arm, a driving cavity communicated with an inlet channel is arranged in the valve body, the driving cavity is communicated with a cavity of the valve body, a driving piece and a fixing piece are arranged in the driving cavity, the fixing piece comprises a fixing block and a first spring, a clamping rod is arranged on the valve clack, and the clamping rod is connected with the rocker arm. A limiting section clamped in the driving cavity is formed on the clamping rod, a fixing clamping groove for clamping the fixing block is formed in the limiting section, and the driving piece drives the clamping rod to be separated from the driving cavity. The check valve has the following advantages and effects that the clamping rod is arranged, so that the valve body can be more stable when being closed.

Description

Technical Field

[0001] The utility model relates to the field of valves, and more particularly to a check valve. Background Art

[0002] A check valve is a valve whose opening and closing part is a circular disc and which relies on its own weight and medium pressure to generate movement to block the backflow of the medium. The disc movement mode is divided into lifting type and swing type. The swing check valve includes a valve body, a disc and a rocker arm. The valve body is provided with a channel for the medium to flow and a valve body cavity for the disc to move. The rocker arm is hinged to the valve body, the rocker arm is located in the valve body cavity, and the disc is arranged on the other side of the rocker arm. The disc closes the horizontal channel and the disc forms an angle with the horizontal channel.

[0003] After closing, existing swing check valves usually rely on the pressure of the medium flowing back to drive the valve disc against the valve body. This structure causes the system pressure to fluctuate when the pressure on both sides of the valve body changes back and forth with little difference. When the inlet pressure drops briefly, the valve disc is easily affected by the residual pressure downstream or gravity and accidentally opens, causing the medium to flow back and forth, which destroys the stability of the system.

[0004] Therefore, there is an urgent need for a new check valve structure that can reliably lock the valve disc under low-pressure conditions and eliminate the risk of accidental opening. Utility Model Content

[0005] The utility model provides a check valve, aiming to solve the problem in the prior art that the valve is easily opened by mistake under low-pressure working conditions.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a check valve, comprising a valve body, a valve disc and a rocker arm, wherein an inlet channel for medium inflow and an outflow channel for medium outflow are provided in the valve body, a valve body cavity for the valve disc to move is provided between the inlet channel and the outflow channel, the rocker arm is hinged to the valve body, the rocker arm is located in the valve body cavity, the valve disc is provided on the other side of the rocker arm, and the valve disc closes the inlet channel, characterized in that a driving cavity connected to the inlet channel is provided in the valve body, the driving cavity is connected to the valve body cavity, a driving part and a fixing part are provided in the driving cavity, the fixing part comprises a fixing block and a first spring, a clamping rod is provided on the valve disc, a limiting section that is clamped to the driving cavity is formed on the clamping rod, a fixing groove that clamps the fixing block is formed on the limiting section, and the driving part drives the clamping rod to disengage from the driving cavity.

[0007] The utility model has the following effects: by providing a fixing block and a first spring, when the limiting section of the clamping rod is clamped in the driving cavity, the fixing block can be clamped in the fixed clamping groove to fix the clamping rod, that is, to lock the valve disc, and a driving member is provided, so that when the pressure on one side of the entrance channel increases, the driving member can be driven to unlock the valve disc.

[0008] The utility model further provides that: the driving member includes a driving block, a driving push rod extends from the driving block, the driving push rod slides in the driving cavity and drives the clamping rod to escape from the driving cavity, and a second spring is sleeved on the driving push rod.

[0009] The utility model has the following effects: a driving block and a driving push rod are provided, and when the pressure on one side of the inlet channel increases, the driving block and the driving push rod can slide in the driving cavity and squeeze the clamping rod to disengage the lock.

[0010] The utility model further provides that: a sealing edge is provided on the outer periphery of the driving block.

[0011] The utility model has the following effects: it can have a sealing effect, and at the same time, by changing the material of the sealing edge, the friction between the sealing edge and the valve body is different, so as to achieve the effect of adjusting the pressure, that is, the material with greater friction requires a higher pressure on one side of the channel to unlock.

[0012] The utility model is further characterized in that: a first guiding surface is formed on the fixing block.

[0013] The utility model has the following effects: the setting of the first guide surface can drive the fixing block to retreat when the clamping rod is clamped and then clamped into the fixed clamping groove, and effectively prevent the clamping rod from being separated.

[0014] The utility model further has the following features: a retraction groove is formed on the fixing block, a retraction rod is formed on the driving block, and a second inclined surface is formed on one end of the retraction rod.

[0015] The utility model has the following effects: when the fixed block is clamped in the fixed slot, the position of the retraction slot will be lower than the retraction rod, and when the pressure on one side of the entrance channel increases, the movement of the driving block will drive the retraction rod to move, and the second inclined surface on the retraction rod will drive the fixed block to retract even if the fixed block is out of the fixed slot.

[0016] The utility model further has the following features: a buffer protrusion is formed on the valve body, a buffer gap is formed on the buffer protrusion, a buffer block cooperating with the valve disc is protruded on the valve disc, and a buffer member is provided in the buffer gap.

[0017] The utility model has the following effects: after the valve disc is opened, the valve disc is buffered to prevent it from being damaged by collision.

[0018] The utility model further provides that: the buffer component includes a buffer plate and a buffer rod, the buffer plate slides in the buffer gap, the buffer rod is connected to the buffer plate and slides on the buffer protrusion, and a third spring connected to the buffer rod is provided in the buffer protrusion.

[0019] The utility model has the following effects: the buffer plate can be limited, and the spring is used to absorb energy, thereby effectively avoiding damage to the valve disc, and at the same time, a better buffering effect can be achieved by changing the material of the buffer plate.

[0020] The utility model further has the following features: a limiting block is provided on the buffer plate, and a limiting sliding groove cooperating with the limiting block is formed in the buffer gap.

[0021] The utility model has the following effects: the buffer plate is limited, double-limited, and prevented from being out of the limit due to impact.

[0022] The utility model further provides that: a sliding block is provided at one end of the buffer plate, the sliding block slides on the buffer plate, a limiting edge is formed on the sliding block, and a limiting groove for sliding of the limiting edge is formed on the buffer plate.

[0023] The utility model has the following effects: the length of one side is variable, which can better provide buffering. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of an embodiment of the utility model;

[0025] Figure 2 This is an enlarged view of part A;

[0026] Figure 3 This is an enlarged view of part B;

[0027] Figure 4 This is an enlarged view of part C.

[0028] In the figure: 1. valve body; 12. inlet channel; 13. outflow channel; 14. valve disc; 2. drive chamber; 21. fixed block; 22. first spring; 31. clamping rod; 32. fixed slot; 41. drive block; 42. drive push rod; 43. second spring; 44. sealing edge; 45. first guide surface; 51. retraction groove; 52. retraction rod; 53. second inclined surface; 6. buffer protrusion; 61. buffer gap; 62. buffer block; 63. buffer plate; 64. buffer rod; 66. third spring; 67. limit block; 7. sliding block; 71. limit edge. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Reference Figures 1 to 4 The embodiments of the present invention are further described.

[0032] A check valve comprises a valve body 1, a valve disc 14 and a rocker arm. The valve body 1 is provided with an inlet channel 12 for medium inflow and an outflow channel 13 for medium outflow. A valve body 1 cavity for the valve disc 14 to move is provided between the inlet channel 12 and the outflow channel 13. The rocker arm is hinged to the valve body 1. The rocker arm is located in the cavity of the valve body 1. The valve disc 14 is arranged on the other side of the rocker arm. The valve disc 14 closes the inlet channel 12. A driving chamber 2 connected to the inlet channel 12 is provided in the valve body 1. The driving chamber 2 is connected to the cavity of the valve body 1. A driving member and a fixing member are provided in the driving chamber 2. The fixing member includes a fixing block 21 and a first spring 22. A clamping rod 31 is provided on the valve disc 14. A limiting section that is clamped to the driving chamber 2 is formed on the clamping rod 31. A fixing groove 32 that is clamped to the fixing block 21 is formed on the limiting section. The driving member drives the clamping rod 31 to disengage from the driving chamber 2. By providing a fixing block 21 and a first spring 22, when the limiting section of the clamping rod 31 is clamped in the driving chamber 2, the fixing block 21 can be clamped in the fixing groove 32 to fix the clamping rod 31, that is, to lock the valve flap 14, and a driving member is provided so that when the pressure on one side of the inlet channel 12 increases, the driving member can be driven to unlock the valve flap 14.

[0033] The driving member includes a driving block 41, from which extends a driving push rod 42. The driving push rod 42 slides within the driving chamber 2 and drives the engaging rod 31 out of the driving chamber 2. A second spring 43 is sleeved on the driving push rod 42. The driving block 41 and the driving push rod 42 are provided so that when the pressure on the side of the inlet passage 12 increases, the driving block 41 and the driving push rod 42 can slide within the driving chamber 2 and squeeze the engaging rod 31 to release the locking mechanism.

[0034] The driving block 41 is provided with a sealing edge on its outer periphery. This not only provides a sealing function, but also allows the friction between the sealing edge and the valve body 1 to be varied by changing the material of the sealing edge, thereby achieving a pressure adjustment effect. In other words, the material with greater friction requires a higher pressure on the side of the channel 12 to unlock the valve.

[0035] The fixing block 21 is formed with a first guide surface 45. The first guide surface 45 can drive the fixing block 21 to retreat and then be engaged into the fixing slot 32 when the engaging rod 31 is engaged, and effectively prevent the engaging rod 31 from being disengaged.

[0036] A retraction groove 51 is formed in the fixed block 21, and a retraction rod 52 is formed on the driving block 41. One end of the retraction rod 52 has a second inclined surface 53. When the fixed block 21 is engaged in the fixed slot 32, the retraction groove 51 is positioned lower than the retraction rod 52. When the pressure on the side of the inlet channel 12 increases, the movement of the driving block 41 drives the retraction rod 52 to move. The second inclined surface 53 on the retraction rod 52 drives the fixed block 21 to retract, even if the fixed block 21 is released from the fixed slot 32.

[0037] The valve body 1 is provided with a buffer protrusion 6, a buffer gap 61 is formed on the buffer protrusion 6, a buffer block 62 is provided on the valve disc 14 to cooperate with the buffer protrusion 6, and a buffer member is provided in the buffer gap 61. After the valve disc 14 is opened, the valve disc 14 is buffered to prevent it from being damaged by collision.

[0038] The buffer member includes a buffer plate 63 and a buffer rod 64. The buffer plate 63 slides within the buffer gap 61. The buffer rod 64 is connected to the buffer plate 63 and slides on the buffer protrusion 6. A third spring 66 is provided within the buffer protrusion 6 and connected to the buffer rod 64. This can limit the buffer plate 63 and utilize the spring to absorb energy, effectively preventing damage to the valve disc 14. Furthermore, the material of the buffer plate 63 can be changed to achieve a better buffering effect.

[0039] The buffer plate 63 is provided with a limit block 67, and a limit slot is formed in the buffer gap 61 to match the limit block 67. The buffer plate 63 is limited, and double limit is provided to prevent the buffer plate 63 from being disengaged due to impact.

[0040] One end of the buffer plate 63 is provided with a sliding block 7, which slides on the buffer plate 63. The sliding block 7 is formed with a limiting edge 71, and the buffer plate 63 is formed with a limiting groove for the limiting edge 71 to slide. The length of one side can be changed to provide better buffering.

[0041] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A check valve comprising a valve body, a valve disc, and a rocker arm. The valve body is provided with an inlet channel for medium inflow and an outlet channel for medium outflow. A valve body cavity for the valve disc to move is provided between the inlet channel and the outlet channel. The rocker arm is hingedly connected to the valve body and is located in the valve body cavity. The valve disc is provided on the other side of the rocker arm and seals the inlet channel. The valve is characterized by: A driving chamber connected to the entrance channel is provided in the valve body, and the driving chamber is connected to the valve body cavity. A driving member and a fixing member are provided in the driving chamber. The fixing member includes a fixing block and a first spring. A clamping rod is provided on the valve disc, and a limiting section that is clamped to the driving chamber is formed on the clamping rod. A fixing groove that is clamped to the fixing block is formed on the limiting section. The driving member drives the clamping rod to disengage from the driving chamber.

2. A check valve according to claim 1, characterized in that: The driving member includes a driving block, a driving push rod extends from the driving block, the driving push rod slides in the driving cavity and drives the clamping rod to escape from the driving cavity, and a second spring is sleeved on the driving push rod.

3. A check valve according to claim 2, characterized in that: A sealing edge is provided on the outer periphery of the driving block.

4. A check valve according to claim 2, characterized in that: A first guiding surface is formed on the fixing block.

5. A check valve according to claim 2, characterized in that: A retraction groove is formed on the fixing block, and a retraction rod is formed on the driving block. A second inclined surface is formed on one end of the retraction rod.

6. A check valve according to claim 1, characterized in that: A buffer protrusion is formed on the valve body, a buffer gap is formed on the buffer protrusion, a buffer block cooperating with the valve disc is protruded on the valve disc, and a buffer member is arranged in the buffer gap.

7. A check valve according to claim 6, characterized in that: The buffer member includes a buffer plate and a buffer rod. The buffer plate slides in the buffer gap. The buffer rod is connected to the buffer plate and slides on the buffer protrusion. A third spring connected to the buffer rod is provided in the buffer protrusion.

8. A check valve according to claim 7, characterized in that: A limiting block is provided on the buffer plate, and a limiting sliding groove cooperating with the limiting block is formed in the buffer gap.

9. A check valve according to claim 8, characterized in that: A sliding block is provided at one end of the buffer plate. The sliding block slides on the buffer plate. A limiting edge is formed on the sliding block. A limiting groove for sliding the limiting edge is formed on the buffer plate.

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