Valve rod assembly and stop valve

Abstract

The valve rod assembly comprises a valve body, a liquid inlet is formed in the left side of the valve body, a liquid outlet is formed in the right end of the valve body, a valve port communicated with the liquid inlet and the liquid outlet is formed in the middle of the inner side of the valve body, and a mounting hole coaxially corresponding to the valve port is formed in the upper side of the valve body. The valve rod is connected into the mounting hole, the valve rod moves downwards, the plugging section can be in sealing fit with the upper side of the valve port, the connecting section and the plugging disc enter the valve port, an annular plugging ring is arranged on the inner side wall of the valve port, the outer diameter of the plugging disc is larger than the inner diameter of the plugging ring, and the connecting rod extends to the lower side of the valve port. When the valve is opened, the valve rod drives the valve clack to move upwards, the valve port is opened, fluid enters and jacks up the plugging disc, when fluid backflow occurs, the backflow fluid can drive the plugging disc to move downwards, the plugging disc is matched with the plugging ring, backflow of the fluid is stopped, and the valve is simple in structure, low in manufacturing cost and convenient to install and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a valve stem assembly and a stop valve. Background Art

[0002] In fluid delivery systems, stop valves are widely used to control the flow and cutoff of fluids. However, traditional stop valves often have some problems in actual use.

[0003] In many cases, fluid backflow may occur due to changes in system pressure, failures or other factors. Backflow not only affects the normal operation of the system and reduces efficiency, but may also lead to serious consequences such as equipment damage and medium pollution.

[0004] For example, in a water supply system, if there are no effective backflow prevention measures, when the main pipeline pressure drops or the water supply is cut off, sewage or other unclean liquids may flow back into the clean water supply network, polluting the water quality and threatening public health.

[0005] In industrial piping systems, backflow may cause the running equipment to stop working suddenly, resulting in production interruption and economic losses. At the same time, backflow may also cause impact and damage to the valve itself, shortening its service life.

[0006] In order to solve these problems, although some devices with anti-backflow function have appeared on the market, they are often complex in structure, high in cost, and inconvenient to install and maintain. Utility Model Content

[0007] In view of the problems pointed out in the background technology, the utility model proposes a valve stem assembly and a stop valve to solve the above technical problems.

[0008] The technical solution of the utility model is achieved in this way:

[0009] A valve stem assembly comprises a valve stem, wherein the lower end of the valve stem is connected with a valve disc, the lower side of the valve disc is connected with a connecting rod, and a sealing disk is slidably connected to the connecting rod.

[0010] The utility model is further configured that the blocking disk is provided with a through hole, and the connecting rod is adapted to be connected in the through hole.

[0011] The utility model is further configured that the lower end of the connecting rod is threadedly connected with a limiting nut.

[0012] The utility model is further configured that the valve flap is composed of a blocking section and a connecting section arranged up and down, the blocking section and the connecting section are coaxially arranged, and the diameter of the blocking section is greater than the diameter of the connecting section.

[0013] A stop valve comprises a valve body, a liquid inlet is provided on the left side of the valve body, a liquid outlet is provided on the right end of the valve body, a valve port connecting the liquid inlet and the liquid outlet is provided in the middle of the inner side of the valve body, a mounting hole coaxially corresponding to the valve port is provided on the upper side of the valve body, and the above-mentioned valve stem assembly is also included, the valve stem is connected in the mounting hole, the valve stem moves downward, the sealing section can form a sealing fit with the upper side of the valve port, the connecting section and the sealing disk enter the valve port, an annular sealing ring is provided on the inner side wall of the valve port, the outer diameter of the sealing disk is larger than the inner diameter of the sealing ring, and a connecting rod extends to the lower side of the valve port.

[0014] The utility model is further configured such that the diameter of the connecting section is equal to the inner diameter of the valve port.

[0015] The utility model is further configured that the connecting rod is provided with one, and the connecting rod is coaxially arranged with the valve stem.

[0016] The utility model is further configured that the connecting rods are provided with at least two.

[0017] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0018] The valve stem assembly and stop valve provided by the utility model, when the valve is opened, the valve stem drives the valve disc to move upward, the valve port is opened, the fluid enters, and the blocking disk is lifted; when fluid reflux occurs, the refluxed fluid drives the blocking disk to move downward, and the blocking disk cooperates with the blocking ring to prevent the reflux of the fluid; the utility model has a simple structure, low manufacturing cost, and is convenient for installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a structural schematic diagram of the valve of the utility model in the closed state.

[0021] Figure 2 It is a structural schematic diagram of the valve of the utility model in the open state.

[0022] Figure 3 It is a structural schematic diagram of the valve stem assembly of the utility model.

[0023] Figure 4 It is a structural schematic diagram of the valve body of the utility model. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] For reference Figure 1-4 The utility model is described as follows:

[0026] Embodiment 1: A stop valve comprises a valve body 6, a liquid inlet 61 is provided on the left side of the valve body 6, a liquid outlet 62 is provided on the right end of the valve body 6, a valve port 63 connecting the liquid inlet 61 and the liquid outlet 62 is provided in the middle of the inner side of the valve body 6, and a mounting hole 64 corresponding to the valve port 63 is provided on the upper side of the valve body 6. The flow path of the liquid in the stop valve is clear: it enters from the liquid inlet 61, passes through the adjustment control of the valve port 63, and then flows out from the liquid outlet 62. This structural design is relatively common and basic, and provides a guarantee for realizing the basic functions of the stop valve.

[0027] It also includes a valve stem assembly, which includes a valve stem 1 as the main transmission component, which controls the opening and closing of the valve by moving up and down, the lower end of the valve stem 1 is connected to a valve disc 2, the lower side of the valve disc 2 is connected to a connecting rod 3, a blocking disk 4 is slidably connected to the connecting rod 3, the blocking disk 4 is provided with a through hole, and the connecting rod 3 is adapted to be connected in the through hole. The lower end of the connecting rod 3 is threadedly connected to a limit nut 5, and the limit nut 5 prevents the blocking disk 4 from escaping from the lower end of the connecting rod 3. The valve disc 2 is composed of a blocking section 21 and a connecting section 22 arranged up and down, the blocking section 21 and the connecting section 22 are coaxially arranged, the diameter of the blocking section 21 is larger than the diameter of the connecting section 22, the lower end of the valve stem 1 is connected to the blocking section 21, and the upper end of the connecting rod 3 is connected to the connecting section 22.

[0028] Valve stem 1: As a key transmission element, its up and down movement directly determines the opening and closing state of the valve. Valve stem 1 can transmit the external operating force to valve disc 2 to control the flow of fluid.

[0029] Valve flap 2: It consists of a blocking section 21 and a connecting section 22. The blocking section 21 has a larger diameter and is used to cooperate with the valve port 63 to achieve sealing and prevent fluid from passing through; the connecting section 22 has a smaller diameter and mainly serves to connect the blocking section 21 and the connecting rod 3 to ensure a stable connection between the valve flap 2 and the connecting rod 3.

[0030] Connecting rod 3: on one hand, it connects the valve disc 2, and on the other hand, it provides a sliding track for the blocking disk 4. The connecting rod 3 enables the valve disc 2 and the blocking disk 4 to work together to achieve the normal function and backflow prevention function of the valve.

[0031] The blocking disk 4 is slidably connected to the connecting rod 3 through the through hole on the blocking disk 4, and can move up and down on the connecting rod 3. When the fluid flows normally, the blocking disk 4 is lifted up by the fluid; when the fluid flows back, the blocking disk 4 can fall down and play a blocking role.

[0032] Limit nut 5: connected to the lower end of the connecting rod 3 through threads, it effectively prevents the blocking disk 4 from accidentally falling out from the lower end of the connecting rod 3, ensuring the stability and reliability of the entire structure.

[0033] The valve stem 1, the valve disc 2, the connecting rod 3, the blocking disk 4 and the limit nut 5 cooperate with each other to complete the opening and closing control and backflow prevention functions of the valve.

[0034] The valve stem 1 is connected to the mounting hole 64. When the valve stem 1 moves downward, the blocking section 21 can form a sealing fit with the upper side of the valve port 63. The connecting section 22 and the blocking disk 4 enter the valve port 63. The diameter of the connecting section 22 is equal to the inner diameter of the valve port 63. A circular blocking ring 65 is provided on the lower side of the inner wall of the valve port 63. The outer diameter of the blocking disk 4 is larger than the inner diameter of the blocking ring 65. The connecting rod 3 extends to the lower side of the valve port 63. The connecting rod 3 connects the valve disc 2 and the blocking disk 4, and ensures that the blocking disk 4 can slide thereon. The valve disc 2 is composed of the blocking section 21 and the connecting section 22. The blocking section 21 is used to cooperate with the valve port 63 to achieve sealing, and the connecting section 22 plays a role of connection and support. The blocking disk 4 cooperates with the blocking ring 65 to prevent backflow when the fluid refluxes.

[0035] When the valve stem 1 moves downward, the blocking section 21 of the valve disc 2 will be in close contact with the upper side of the valve port 63 to form a good seal, thereby blocking the flow of liquid and closing the valve. At this time, the connecting section 22 and the blocking disc 4 enter the valve port 63 together.

[0036] The diameter of the connecting section 22 is equal to the inner diameter of the valve port 63 , which enables the connecting section 22 to maintain a stable position in the valve port 63 and does not affect the normal flow of the liquid (when the valve is open).

[0037] The blocking ring 65 on the lower side of the inner wall of the valve port 63 cooperates with the blocking disk 4. Under normal circumstances, when the valve is opened and the liquid flows forward, the pressure of the liquid will lift up the blocking disk 4 so that it does not affect the passage of the liquid. When the fluid refluxes, the pressure of the refluxed fluid will drive the blocking disk 4 to move downward. Since the outer diameter of the blocking disk 4 is larger than the inner diameter of the blocking ring 65, the blocking disk 4 will fit tightly with the blocking ring 65 to form a seal, thereby preventing the fluid from flowing back.

[0038] The connecting rod 3 not only connects the valve disc 2 and the blocking disk 4, but also ensures that the blocking disk 4 can slide smoothly thereon to achieve the above-mentioned normal flow and backflow prevention functions.

[0039] Working principle: When the valve is opened, the valve stem 1 drives the valve disc 2 to move upward, the valve port 63 is opened, and the fluid can pass through. At this time, the fluid enters and lifts the blocking disk 4. When fluid backflow occurs, the backflowing fluid will drive the blocking disk 4 to move downward. Since the outer diameter of the blocking disk 4 is larger than the inner diameter of the blocking ring 65, the blocking disk 4 will cooperate with the blocking ring 65 to form a seal, thereby preventing the fluid from flowing back.

[0040] Good anti-backflow effect: Through the clever cooperation of the blocking disk 4 and the blocking ring 65, the backflow of fluid can be effectively prevented, ensuring the safe and stable operation of the system. Compact structure: The various components of the valve stem assembly cooperate with each other, while realizing the valve function, occupying a small space. Sensitive action: When the fluid refluxes, the blocking disk 4 can respond quickly and play an anti-backflow role in time.

[0041] The blocking disk 4 and the blocking ring 65 are mainly responsible for the important tasks of blocking and preventing backflow. Although they do not necessarily form an absolute seal, they can still play a key role in preventing fluid backflow. Even if the cooperation between them does not reach a completely airtight or liquid-tight sealing level, there may be a small amount of leakage under normal fluid flow and a relatively small reflux pressure. However, when the reflux pressure is relatively high, the contact between the blocking disk 4 and the blocking ring 65 will be closer, thereby effectively reducing or even preventing the backflow of most of the fluid. This design that is not completely sealed but can effectively prevent backflow has certain advantages. For example, it can reduce the precision requirements for manufacturing and installation to a certain extent, thereby reducing costs. At the same time, under normal working conditions, allowing a small amount of leakage can also avoid problems such as excessive valve operation resistance caused by excessive sealing. In addition, this design also has a certain degree of fault tolerance. Even if the components are slightly worn or deformed, they can still play a good anti-backflow effect under a relatively large reflux pressure.

[0042] The connecting rod 3 is provided with a connecting rod 3, and the connecting rod 3 is coaxially arranged with the valve stem 1. The coaxial arrangement enables the force to be transmitted along the same axis during the operation of the valve, reducing the distortion or deformation of the components caused by the inconsistent direction of the force, thereby ensuring the stability and reliability of the structure. The connecting rod 3 arranged coaxially occupies less space, making the structure of the entire stop valve more compact, and is suitable for occasions with limited installation space.

[0043] At least two connecting rods 3 are provided, so that the valve disc 2 and the blocking disk 4 are subjected to more balanced forces during movement, avoiding jamming or poor sealing caused by excessive force on one side. Multiple connecting rods 3 can provide more precise guidance for the sliding of the blocking disk 4, ensuring that it remains vertical when moving up and down, better cooperating with the blocking ring 65, and enhancing the anti-backflow effect and sealing performance.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve stem assembly, comprising a valve stem (1), wherein the lower end of the valve stem (1) is connected to a valve flap (2), characterized in that: The lower side of the valve flap (2) is connected to a connecting rod (3), and a sealing disk (4) is slidably connected to the connecting rod (3).

2. A valve stem assembly according to claim 1, characterized in that: The blocking disk (4) is provided with a through hole, and the connecting rod (3) is adapted to be connected in the through hole.

3. A valve stem assembly according to claim 2, characterized in that: The lower end of the connecting rod (3) is threadedly connected with a limiting nut (5).

4. A valve stem assembly according to claim 3, characterized in that: The valve flap (2) is composed of a blocking section (21) and a connecting section (22) arranged up and down. The blocking section (21) and the connecting section (22) are coaxially arranged, and the diameter of the blocking section (21) is larger than the diameter of the connecting section (22).

5. A stop valve, comprising a valve body (6), a liquid inlet (61) being provided on the left side of the valve body (6), a liquid outlet (62) being provided on the right end of the valve body (6), a valve port (63) being provided in the middle of the inner side of the valve body (6) and communicating with the liquid inlet (61) and the liquid outlet (62), and a mounting hole (64) being coaxial with the valve port (63) being provided on the upper side of the valve body (6), characterized in that: It also includes a valve stem assembly as described in claim 4, the valve stem (1) is connected in the mounting hole (64), the valve stem (1) moves downward, the sealing section (21) can form a sealing fit with the upper side of the valve port (63), the connecting section (22) and the sealing disk (4) enter the valve port (63), an annular sealing ring (65) is provided on the inner side wall of the valve port (63), the outer diameter of the sealing disk (4) is larger than the inner diameter of the sealing ring (65), and the connecting rod (3) extends to the lower side of the valve port (63).

6. A stop valve according to claim 5, characterized in that: The diameter of the connecting section (22) is equal to the inner diameter of the valve port (63).

7. A stop valve according to claim 5, characterized in that: The connecting rod (3) is provided with a, and the connecting rod (3) is coaxially arranged with the valve stem (1).

8. A stop valve according to claim 5, characterized in that: The connecting rods (3) are provided with at least two.

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