Anti-loose valve stem

Abstract

The utility model relates to a kind of anti-loosening valve stem, including valve main body, bonnet being installed on valve main body, valve stem body being set in the inside of the bonnet and being used to be connected with valve piece;Bushing is connected on the bonnet by bolt, the outside of the valve stem body and above the bushing detachably install handle, the handle is connected with the valve stem body by fastener;A pair of interface rings are installed on the upper surface of the bushing, and the bottom of the handle is provided with connecting barrel.The anti-loosening valve stem, by thread compression, ratchet gear engagement spring pre-tightening triple anti-loosening design, can effectively resist vibration, temperature change, medium impact and other complex working conditions, avoid valve stem self-rotating caused valve misoperation or misoperation, prevent safety accidents caused by medium leakage, in addition, the degree of integration of components of the present application is high, spring and ratchet structure are arranged around valve stem body, without additional occupation of valve external space.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a valve stem designed to prevent loosening. Background Technology

[0002] The valve stem is the core transmission component of a valve. Through its linkage with the valve core, it enables the valve to open, close, and regulate flow. It is widely used in various fields such as petrochemicals, water conservancy and hydropower, industrial manufacturing, and urban pipe networks. The stability of its connection directly determines the valve's sealing performance and operational safety. During long-term valve use, the valve stem frequently withstands multiple forces, including medium pressure, operating torque, and temperature changes, while also facing the influence of complex operating conditions such as vibration and corrosion. Therefore, its anti-loosening performance is subject to extremely high requirements.

[0003] Currently, the mainstream valve stem connection methods in the industry mostly adopt traditional structures such as threaded fit, pin fixation, or simple interference fit. These structures can meet the basic fixing requirements under short-term use or stable operating conditions, but in complex and harsh actual application scenarios, they are prone to loosening. On the one hand, the repeated torque during valve opening and closing operations and the continuous vibration generated by the pipeline system will gradually weaken the connection preload of the threads or pins, leading to an increase in the connection gap between the valve stem and the valve core and actuator, eventually causing loosening. On the other hand, in high temperature, low temperature alternation or corrosive media environments, the materials of the valve stem and connecting components will undergo thermal expansion and contraction, oxidation and corrosion, further damaging the stability of the connection structure and exacerbating the risk of loosening. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a valve stem that prevents loosening, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-loosening valve stem, comprising a valve body, a valve cover mounted on the valve body, and a valve stem body that penetrates the inside of the valve cover and is used for connection with a valve plate; A pressure cap is bolted to the valve cover, and a handle is detachably installed on the outside of the valve stem body and above the pressure cap. The handle is connected to the valve stem body by fasteners. A mating ring is installed on the upper surface of the cap, and a connecting cylinder is provided at the bottom of the handle. The end faces of the mating ring and the connecting cylinder opposite each other are provided with ratchet grooves, and the two ratchet grooves are in an engaged state.

[0006] Furthermore, a rectangular rod is integrally formed on the outer side of the valve stem body and at the connection with the handle. Corresponding to the rectangular rod, a rectangular through hole adapted to the rectangular rod is provided inside the handle, so that the handle can slide up and down on the outer side of the valve stem body and drive the valve stem body to rotate circumferentially.

[0007] Furthermore, a threaded groove is provided on the outer side of the valve stem body and near its top, and the fastener is threadedly connected to the outer side of the threaded groove.

[0008] Furthermore, the fastener is a nut structure, and multiple connecting rods are provided on the outside of the fastener, with the same connecting ring provided at the end of the multiple connecting rods away from the fastener.

[0009] Furthermore, both the docking ring and the connecting cylinder are sleeved on the outside of the valve stem body, and a gap is maintained between them and the valve stem body.

[0010] Furthermore, a bearing ring is provided on the outer side of the valve stem body, and a spring is installed between the bearing ring and the inner top wall of the connecting cylinder. The spring is sleeved on the outer side of the valve stem body and located inside the gap between the connecting cylinder and the valve stem body.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial effects: The valve stem, with its triple anti-loosening design consisting of threaded clamping and ratchet engagement spring preload, can effectively resist complex working conditions such as vibration, temperature changes, and media impact, preventing the valve from being opened or closed accidentally due to the valve stem rotating on its own, and preventing safety accidents caused by media leakage. In addition, the components of this application have a high degree of integration, with the spring and ratchet structure arranged around the valve stem body, without occupying additional external space of the valve. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the disassembled structure of this utility model.

[0013] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve stem body; 301. Rectangular rod; 4. Gland; 5. Handle; 6. Fastener; 601. Connecting rod; 602. Connecting ring; 7. Butt ring; 8. Connecting cylinder; 9. Bearing ring; 10. Spring. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-3 The valve stem in this embodiment is designed to prevent loosening. Through the coordinated design of ratchet engagement and elastic pre-tightening, the valve stem connection stability is enhanced. It is suitable for valves in the fields of petrochemical, water conservancy and hydropower, and industrial manufacturing, and meets the sealing and operation requirements under harsh conditions such as high pressure, vibration, and temperature change.

[0016] Specifically, the valve body 1 is equipped with a valve plate inside, which is used to control the opening and closing of the medium and regulate the flow rate; the valve cover 2 is installed on the valve body 1 and is fixed to the valve body 1 by bolts; the valve stem body 3 is installed inside the valve cover 2 and its bottom end is connected to the valve plate. The valve plate is driven to move by rotation to realize the valve opening and closing and the flow rate regulation.

[0017] Furthermore, a pressure cap 4 is bolted to the valve cover 2. The pressure cap 4 is used to press the sealing component on the outside of the valve stem body 3 to enhance the valve sealing performance and provide an installation base for the docking ring 7. The docking ring 7 is installed on the upper surface of the pressure cap 4. The docking ring 7 is sleeved on the outside of the valve stem body 3, with a gap between it and the valve stem body 3 to avoid affecting the rotation of the valve stem body 3. The upper end face of the docking ring 7 is provided with a ratchet groove for engaging with the connecting cylinder 8 to prevent loosening.

[0018] Furthermore, a handle 5 is detachably installed on the outer side of the valve stem body 3 and above the pressure cap 4. The handle 5 is used for manual operation to rotate the valve stem body 3. A rectangular rod 301 is integrally formed at the connection between the outer side of the valve stem body 3 and the handle 5. A rectangular through hole adapted to the rectangular rod 301 is opened inside the handle 5, so that the handle 5 can slide up and down on the outer side of the valve stem body 3 and can drive the valve stem body 3 to rotate circumferentially to avoid relative slippage. The handle 5 is connected to the valve stem body 3 by a fastener 6. A threaded groove is opened on the outer side of the valve stem body 3 near the top. The fastener 6 is threaded to the outer side of the threaded groove. The handle 5 can be pushed or released by the axial movement of the fastener 6.

[0019] In detail, the fastener 6 is a nut structure with multiple connecting rods 601 on the outside. The ends of the multiple connecting rods 601 away from the fastener 6 are equipped with the same connecting ring 602. By rotating the connecting ring 602, the fastener 6 can be rotated and moved along the threaded groove of the valve stem body 3, which facilitates precise control of the tightness and axial position of the fastener 6. The bottom of the handle 5 is equipped with a connecting cylinder 8, which is sleeved on the outside of the valve stem body 3 with a gap between it and the valve stem body 3. The bottom end face is provided with a ratchet groove, which can be engaged or disengaged with the ratchet groove of the mating ring 7. When engaged, it forms an anti-loosening structure, and when disengaged, it allows the valve stem to rotate.

[0020] More specifically, a bearing ring 9 is provided on the outer side of the valve stem body 3, and a spring 10 is installed between the bearing ring 9 and the inner top wall of the connecting cylinder 8. The spring 10 is sleeved on the outer side of the valve stem body 3 and located inside the gap between the connecting cylinder 8 and the valve stem body 3. When the fastener 6 is loosened, the spring 10 can release elastic potential energy to push the connecting cylinder 8 and the handle 5 to move upward. When the fastener 6 is tightened, it can squeeze the handle 5 and the connecting cylinder 8 to move downward, so that the spring 10 is in a compressed state, forming a continuous preload force.

[0021] In practical applications, the valve stem body 3 passes through the valve cover 2, and its bottom end is connected to the valve plate inside the valve body 1. The valve cover 2 is fixed to the valve body 1 with bolts. The pressure cap 4 is installed on the valve cover 2 and the bolts are tightened to press the sealing components. The mating ring 7 is fixed on the upper surface of the pressure cap 4, ensuring that the ratchet groove faces upward. The spring 10 is sleeved on the outside of the valve stem body 3, and the bearing ring 9 is placed. The rectangular through hole of the handle 5 is aligned with the rectangular rod 301 of the valve stem body 3, and it is slid in from top to bottom, so that the connecting cylinder 8 is directly above the mating ring 7. The fastener 6 is threaded to the outside of the threaded groove at the top of the valve stem body 3. The connecting ring 602 is rotated to drive the fastener 6 to tighten downward, pushing the handle 5 and the connecting cylinder 8 to move down synchronously until the ratchet groove of the connecting cylinder 8 and the ratchet groove of the mating ring 7 are tightly engaged. At this time, the spring 10 is compressed and stores elastic potential energy, completing the assembly.

[0022] When the valve needs to be opened or closed, rotating the connecting ring 602 causes the fastener 6 to loosen upward along the threaded groove of the valve stem body 3, releasing the downward pressure on the handle 5; the compressed spring 10 releases its elastic potential energy, pushing the connecting cylinder 8 and the handle 5 to move synchronously, causing the ratchet groove of the connecting cylinder 8 to disengage from the ratchet groove of the docking ring 7, releasing the circumferential anti-loosening restriction; gripping the handle 5 and rotating it causes the valve stem body 3 to rotate forward or backward through the transmission cooperation between the rectangular rod 301 and the rectangular through hole, driving the valve stem body 3 to drive the valve plate to move, realizing the opening or closing of the valve; after the valve is adjusted to the correct position, rotating the connecting ring 602 in the opposite direction causes the fastener 6 to tighten downward, the fastener 6 pushes the handle 5 and the connecting cylinder 8 to move downward synchronously, squeezing the spring 10 to compress it again, and at the same time, the ratchet groove of the connecting cylinder 8 and the ratchet groove of the docking ring 7 re-engage tightly, restoring the circumferential anti-loosening fixation, completing the operation.

[0023] When disassembly and maintenance are required, rotate the connecting ring 602 to completely unscrew the fastener 6 from the threaded groove at the top of the valve stem body 3; under the elastic force of the spring 10, the handle 5 and the connecting cylinder 8 pop upwards and can be directly removed from the valve stem body 3; then remove the gland 4 and the mating ring 7 to inspect or replace the valve stem body 3, sealing components and the internal structure of the valve; after maintenance, reverse the installation and assembly process to reassemble the components and restore the valve stem's anti-loosening and operating functions.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve stem with anti-loosening function, comprising a valve body (1), a valve cover (2) mounted on the valve body (1), and a valve stem body (3) extending through the valve cover (2) and used for connection with a valve plate, characterized in that: A pressure cap (4) is bolted to the valve cover (2). A handle (5) is detachably installed on the outside of the valve stem body (3) and above the pressure cap (4). The handle (5) is connected to the valve stem body (3) by fasteners (6). A mating ring (7) is installed on the upper surface of the pressure cap (4), and a connecting cylinder (8) is provided at the bottom of the handle (5). The end faces of the mating ring (7) and the connecting cylinder (8) opposite each other are provided with ratchet grooves, and the two ratchet grooves are in a meshing state.

2. The valve stem for preventing loosening according to claim 1, characterized in that: A rectangular rod (301) is integrally formed on the outer side of the valve stem body (3) and at the connection with the handle (5). Corresponding to the rectangular rod (301), a rectangular through hole adapted to the rectangular rod (301) is opened inside the handle (5) so that the handle (5) can slide up and down on the outer side of the valve stem body (3) and drive the valve stem body (3) to rotate circumferentially.

3. The valve stem for preventing loosening according to claim 1, characterized in that: A threaded groove is provided on the outside of the valve stem body (3) and near its top, and the fastener (6) is threaded to the outside of the threaded groove.

4. The anti-loosening valve stem according to claim 1, characterized in that: The fastener (6) is a nut structure, and multiple connecting rods (601) are provided on the outside of the fastener (6). The ends of the multiple connecting rods (601) away from the fastener (6) are provided with the same connecting ring (602).

5. The anti-loosening valve stem according to claim 1, characterized in that: The docking ring (7) and the connecting cylinder (8) are both sleeved on the outside of the valve stem body (3), and a gap is maintained between them.

6. The valve stem for preventing loosening according to claim 5, characterized in that: A bearing ring (9) is provided on the outer side of the valve stem body (3). A spring (10) is installed between the bearing ring (9) and the inner top wall of the connecting cylinder (8). The spring (10) is sleeved on the outer side of the valve stem body (3) and located inside the gap between the connecting cylinder (8) and the valve stem body (3).

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