Check valve
By setting the drive chamber and buffer structure in the check valve, the problem of the swivel check valve being accidentally opened under low pressure conditions is solved, and the valve disc is reliable locking and buffering protection is achieved to ensure system stability and valve disc safety.
Patent Information
- Application Number
- CN202521228509.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-16
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2035-06-16
AI Technical Summary
The existing swing check valve is susceptible to downstream residual pressure or gravity in low pressure conditions, causing the medium to flow backflow and destroying the stability of the system.
A driving cavity is provided in the valve body, including a fixed block, a first spring and a driving member. Through the coordination of the lever and the limiting section, the lever is driven away from the lock by pressure changes, and the valve disc is prevented from opening by mistake through the sealing edge and buffer structure.
It realizes reliable locking of the valve disc under low pressure conditions, prevents misopening, ensures system stability, and protects the valve disc from damage through buffer structure.
Smart Images
Figure CN223178228U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of valves, and more specifically, to a check valve. Background Art
[0002] A check valve refers to a valve whose closing member is a circular valve flap and which blocks the reverse flow of the medium by its own weight and the action of the medium pressure. The movement mode of the valve flap is divided into a lifting type and a swing type. The swing check valve includes a valve body, a valve flap and a rocker arm. A channel for the medium to flow through and a valve body cavity for the valve flap to move are arranged in the valve body. The rocker arm is hinged to the valve body and is located in the valve body cavity. The valve flap is arranged on the other side of the rocker arm. The valve flap closes the horizontal channel and forms an angle with the horizontal channel.
[0003] After the existing swing check valve is closed, it usually relies on the pressure during the reverse flow of the medium to drive the valve flap to abut against the valve body. In this structure, when the pressure on both sides of the valve body changes back and forth with little difference, that is, when the system pressure fluctuates, when the inlet pressure decreases briefly, the valve flap is easily affected by the residual pressure or gravity downstream and accidentally opens, causing the reverse flow of the medium and damaging the system stability.
[0004] Therefore, there is an urgent need for a new check valve structure that can reliably lock the valve flap under low-pressure working conditions and eliminate the risk of accidental opening. Summary of the Utility Model
[0005] The utility model provides a check valve, aiming to solve the problem that the valve is easily accidentally opened under low-pressure working conditions in the prior art.
[0006] To achieve the above object, the utility model provides the following technical solution: A check valve includes a valve body, a valve flap and a rocker arm. An inlet channel for the medium to flow in and an outlet channel for the medium to flow out are arranged in the valve body. A valve body cavity for the valve flap to move is arranged between the inlet channel and the outlet channel. The rocker arm is hinged to the valve body and is located in the valve body cavity. The valve flap is arranged on the other side of the rocker arm. The valve flap closes the inlet channel. It is characterized in that: A driving cavity communicating with the inlet channel is arranged in the valve body. The driving cavity communicates with the valve body cavity. A driving member and a fixing member are arranged in the driving cavity. The fixing member includes a fixing block and a first spring. A clamping rod is arranged on the valve flap. 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 on the limiting section. The driving member drives the clamping rod to disengage from the driving cavity.
[0007] The utility model has the following effects: By arranging 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 fixing clamping groove to fix the clamping rod, that is, lock the valve flap. And a driving member is arranged, so that when the pressure on one side of the inlet channel increases, the driving member can be driven to unlock the valve flap.
[0008] The present utility model is further provided that: the driving member includes a driving block, a driving ejector rod extends from the driving block, the driving ejector rod slides in the driving cavity and drives the clamping rod out of the driving cavity, and a second spring is sleeved on the driving ejector rod.
[0009] The present utility model has the following effects: the driving block and the driving ejector rod are provided. When the pressure on one side of the inlet channel increases, the driving block and the driving ejector rod can slide in the driving cavity and squeeze the clamping rod to disengage the lock.
[0010] The present utility model is further provided that: a sealing edge is provided on the outer periphery of the driving block.
[0011] The present utility model has the following effects: it can have a sealing effect. At the same time, by changing the material of the sealing edge, the friction force between the sealing edge and the valve body can be made different to achieve the effect of pressure regulation, that is, the greater the friction force of the material, the higher the pressure on one side of the inlet channel is required to unlock.
[0012] The present utility model is further provided that: a first guiding surface is formed on the fixed block.
[0013] The present utility model has the following effects: the setting of the first guiding surface can drive the fixed block to retract and then be clamped into the fixed card slot when the clamping rod is clamped, and effectively prevent the clamping rod from disengaging.
[0014] The present utility model is further provided that: a retraction groove is recessed on the fixed block, a retraction rod is further formed on the driving block, and a second inclined surface is formed at one end of the retraction rod.
[0015] The present utility model has the following effects: when the fixed block is clamped in the fixed card slot, the position of the retraction groove will be lower than that of the retraction rod. When the pressure on one side of the inlet 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 and disengage the fixed block from the fixed card slot.
[0016] The present utility model is further provided that: a buffer projection protrudes from the valve body, a buffer gap is formed on the buffer projection, a buffer block protrudes from the valve plate and cooperates with it, and a buffer member is arranged in the buffer gap.
[0017] The present utility model has the following effects: it buffers the valve flap after it is opened to prevent it from being damaged by collision.
[0018] The present utility model is further provided 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 in the buffer projection, and a third spring connecting the buffer rod is arranged in the buffer projection.
[0019] The utility model has the following effects: it can limit the buffer plate, absorb energy by using the spring, effectively avoid the damage of the valve flap, and at the same time, the buffer effect can be improved by changing the material of the buffer plate.
[0020] The utility model is further provided that: a limiting block is arranged on the buffer plate, and a limiting sliding groove for cooperating with the limiting block is formed in the buffer gap.
[0021] The utility model has the following effects: limit the buffer plate, double limit, and prevent the buffer plate from being disengaged from the limit due to impact.
[0022] The utility model is further provided that: a sliding block is arranged 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 the limiting edge to slide is formed on the buffer plate.
[0023] The utility model has the following effects: the length of one side is variable, and better buffering can be achieved. Brief Description of the Drawings
[0024] Figure 1 is a structural diagram of an embodiment of the utility model;
[0025] Figure 2 is an enlarged view of part A;
[0026] Figure 3 is an enlarged view of part B;
[0027] Figure 4 is an enlarged view of part C.
[0028] In the figure: 1, valve body; 12, inlet channel; 13, outlet channel; 14, valve flap; 2, driving cavity; 21, fixed block; 22, first spring; 31, clamping rod; 32, fixed clamping groove; 41, driving block; 42, driving ejector rod; 43, second spring; 44, sealing edge; 45, first guiding 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, limiting block; 7, sliding block; 71, limiting edge. Detailed Description of the Embodiment
[0029] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0031] Referring to Figures 1 to 4 A further description will be made on the embodiments of the present utility model.
[0032] A check valve includes a valve body 1, a valve flap 14 and a rocker arm. An inlet passage 12 for the medium to flow in and an outlet passage 13 for the medium to flow out are provided in the valve body 1. A cavity of the valve body 1 for the valve flap 14 to move is provided between the inlet passage 12 and the outlet passage 13. The rocker arm is hinged to the valve body 1 and is located in the cavity of the valve body 1. The valve flap 14 is arranged on the other side of the rocker arm, and the valve flap 14 closes the inlet passage 12. A driving cavity 2 communicating with the inlet passage 12 is provided in the valve body 1. The driving cavity 2 communicates with the cavity of the valve body 1. A driving member and a fixing member are provided in the driving cavity 2. The fixing member includes a fixing block 21 and a first spring 22. A clamping rod 31 is provided on the valve flap 14. A limiting section clamped in the driving cavity 2 is formed on the clamping rod 31, and a fixing clamping groove 32 for clamping the fixing block 21 is formed on the limiting section. The driving member drives the clamping rod 31 to disengage from the driving cavity 2. By providing the fixing block 21 and the first spring 22, when the limiting section of the clamping rod 31 is clamped in the driving cavity 2, the fixing block 21 can be clamped in the fixing clamping groove 32 to fix the clamping rod 31, that is, lock the valve flap 14. And a driving member is provided so that when the pressure on one side of the inlet passage 12 increases, the driving member can be driven to unlock the valve flap 14.
[0033] The driving member includes a driving block 41. A driving ejector rod 42 extends from the driving block 41. The driving ejector rod 42 slides in the driving cavity 2 and drives the clamping rod 31 to disengage from the driving cavity 2. A second spring 43 is sleeved on the driving ejector rod 42. By providing the driving block 41 and the driving ejector rod 42, when the pressure on one side of the inlet passage 12 increases, the driving block 41 and the driving ejector rod 42 can slide in the driving cavity 2 and squeeze the clamping rod 31 to unlock.
[0034] A sealing edge is provided on the outer periphery of the driving block 41. It can have a sealing effect, and at the same time, by changing the material of the sealing edge, the friction force between the sealing edge and the valve body 1 can be made different to achieve the effect of pressure adjustment, that is, the higher the pressure on one side of the inlet passage 12 is required to unlock for the material with greater friction force.
[0035] A first guiding surface 45 is formed on the fixed block 21. The provision of the first guiding surface 45 enables the fixed block 21 to be driven to retract when the clamping rod 31 is inserted, and then the fixed block 21 is clamped into the fixed clamping groove 32, and effectively prevents the clamping rod 31 from disengaging.
[0036] A retraction groove 51 is recessed on the fixed block 21, and a retraction rod 52 is further formed on the driving block 41. A second inclined surface 53 is formed at one end of the retraction rod 52. When the fixed block 21 is clamped in the fixed clamping groove 32, the position of the retraction groove 51 will be lower than that of the retraction rod 52. When the pressure on one side of the inlet passage 12 increases, the movement of the driving block 41 will drive the retraction rod 52 to move, and the second inclined surface 53 on the retraction rod 52 will drive the fixed block 21 to retract so that the fixed block 21 disengages from the fixed clamping groove 32.
[0037] A buffer projection 6 is protruded on the valve body 1, a buffer gap 61 is formed on the buffer projection, a buffer block 62 is protruded on the valve plate and is matched with the buffer projection, and a buffer member is arranged in the buffer gap 61. After the valve flap 14 is opened, the valve flap 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 in the buffer gap 61, the buffer rod 64 is connected to the buffer plate 63 and slides in the buffer projection 6, and a third spring 66 connecting the buffer rod 64 is arranged in the buffer projection 6. It can limit the buffer plate 63, and utilize the energy absorption of the spring to effectively avoid the damage of the valve flap 14. At the same time, the buffer effect can be improved by changing the material of the buffer plate 63.
[0039] A limiting block 67 is arranged on the buffer plate 63, and a limiting sliding groove for matching the limiting block 67 is formed in the buffer gap 61. The buffer plate 63 is limited, and double limiting is carried out to prevent the buffer plate 63 from being disengaged from the limit due to impact.
[0040] A sliding block 7 is arranged at one end of the buffer plate 63. The sliding block 7 slides on the buffer plate 63, a limiting edge 71 is formed on the sliding block 7, and a limiting groove for the limiting edge 71 to slide is formed on the buffer plate 63. The length of one side is variable, which can better perform buffering.
[0041] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.
Claims
1. A check valve, comprising a valve body, a valve flap and a rocker arm. An inlet passage for the medium to flow in and an outlet passage for the medium to flow out are provided in the valve body. A valve body cavity for the valve flap to move is provided between the inlet passage and the outlet passage. The rocker arm is hinged to the valve body and is located in the valve body cavity. The valve flap is arranged on the other side of the rocker arm, and the valve flap closes the inlet passage, and is characterized in that: 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. The 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. The 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 matched 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.