Connecting mechanism for preventing valve element part from loosening and angle valve thereof

Abstract

The utility model provides a connecting mechanism for preventing a valve core part from loosening and an angle valve thereof. The connecting mechanism comprises a valve core, a valve rod and an elastic piece, the valve core comprises a valve core main body and a fastening screw; an annular cavity is formed among the inner wall of the first-stage step of the valve rod, the valve element body and the fastening screw, an elastic piece is arranged in the annular cavity, and the elastic piece is elastically supported between the connecting face of the inner walls of the first-stage step and the second-stage step and the end face of the valve element body. A valve rod and a valve element of the angle valve are connected through a connecting mechanism. The disc spring is used for providing elastic force for matching of the valve element and the valve rod, so that the valve element and the valve rod can be effectively and tightly connected, the valve element and the valve rod cannot loosen, the service life of the valve is effectively prolonged, and the maintenance cost of the valve is controlled.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing and design technology, and in particular to a connection mechanism and its angle valve for preventing valve core components from loosening. Background Technology

[0002] In the design and manufacture of valves, especially angle valves, the valve core body and the metal valve stem are typically rigidly connected at the valve core component location. This rigid connection can be a threaded connection or other similar method. During long-term use, the erosion caused by the medium can easily loosen the connection between the valve core and the valve stem, necessitating maintenance and repair. In angle valves with this type of connection, after disassembly during maintenance, loosening often occurs between the valve core body and the valve stem. Upon reassembly, gaps can easily appear between the valve core body and the metal valve stem. When high-pressure media enters these gaps, it can cause irreversible damage to both the valve core body and the metal valve stem.

[0003] For example, CN202323070623.X discloses a through-wall welded angle valve, and paragraph 0028 of its specification clearly states that "the lower end of the valve stem 201 is provided with a valve core 203", and the valve core is rigidly connected and located at the lower end of the valve stem.

[0004] CN202320979210.4 discloses a composite angle valve. Paragraph 003 of its specification clearly states that "a valve core is installed at one end of the valve stem 3 extending into the inlet / outlet cavity 1-2, and an elastic element is provided between the valve core and the valve stem 3 to allow the valve core to move." The connection between the valve core and the valve stem is mainly achieved through a threaded connection, a rigid connection method. Although a helical spring 5 is provided in the valve core's mounting chamber, this helical spring does not directly act on the threaded connection position of the rigid connection. The positioning at the threaded connection position is achieved by a tightening screw 13 designed on the valve core body 4 to tighten the end cap 12. Compared to elastic positioning, the positioning of the tightening screw 13 is also rigid. Loosening can occur during maintenance and disassembly, and gaps can easily appear during reassembly, shortening the lifespan of the assembled valve body. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a connection mechanism and its angle valve for preventing valve core components from loosening. In the connection between the valve core and the valve stem, the threaded hard connection and the flexible soft connection are combined to provide elastic support for the valve core and valve stem, so that they are tightly connected, reducing the possibility of loosening and effectively controlling the valve maintenance cost.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a connecting mechanism for preventing valve core components from loosening, comprising a valve core and a valve stem; the valve stem has a two-stage stepped countersunk hole corresponding to the connecting end face of the valve core, the circumferential inner walls of the countersunk hole being a first-stage inner wall and a second-stage inner wall, wherein the second-stage inner wall is located away from the connecting end face, and the second-stage inner wall has an internal thread; the valve core includes a valve core body and a fastening screw, one end of the fastening screw being inserted into the countersunk hole of the valve stem, and the outer circumferential surface of the insertion end of the fastening screw having an external thread, which mates with the internal thread of the second-stage inner wall; the valve core body is sleeved on the outer circumferential surface of the fastening screw, and both ends of the valve core body are respectively in frictional engagement with the valve stem and the fastening screw, and are axially positioned relative to the fastening screw; an annular cavity is formed between the first-stage inner wall of the valve stem, the valve core body and the fastening screw, and an elastic element is provided in the annular cavity, the elastic element being elastically supported between the connecting surfaces of the first and second-stage inner walls and the end face of the valve core body.

[0007] In the above scheme, based on the original threaded connection between the valve core and valve stem, a further structural design was carried out on the valve stem and valve core. An annular cavity was formed on the outer periphery of the threaded connection between the valve stem and valve core. An elastic element was designed in the annular cavity. The elastic element is used to elastically tighten the valve stem and valve core on both sides, which can provide elastic assistance for the threaded connection. Even if the threaded part becomes loose, the elastic element can still be used to elastically supplement it, ensuring a tight connection between the valve core and valve stem, and effectively improving the reliability of the connection.

[0008] Furthermore, the elastic element is a disc spring, with one end face of the disc spring elastically connected to the connecting surface of the inner wall of the first and second level steps, and the other end face elastically connected to the valve core body.

[0009] Preferably, the compression of the disc spring is 0.5 mm.

[0010] Furthermore, the valve core body has a countersunk hole at the center of one end face and a mating groove at the outer periphery of the other end, which is in frictional engagement with the countersunk hole end face of the valve stem and the inner wall of the first-level step.

[0011] Furthermore, the fastening screw has an axial cross-section of T-shape, wherein the lower end of the vertical portion of the T-shape has an external thread; the countersunk hole of the valve core body is frictionally engaged with the transverse portion of the T-shape. Both ends of the valve core body are axially limited by stepped surfaces to maintain a tight fit between the valve stem and the valve core.

[0012] Furthermore, a protrusion is fixed to the outer end face of the transverse portion of the fastening screw, and at least two clamping surfaces are provided on the circumferential outer wall of the protrusion. The design of the protrusion clamping surfaces facilitates positioning and clamping when tightening the fastening screw.

[0013] An angle valve includes a valve stem and a valve core, wherein the valve stem and valve core are connected by a connection mechanism described above to prevent loosening of the valve core component. This connection mechanism ensures a tight connection between the valve core and valve stem, preventing loosening and effectively extending the valve's service life. Even during disassembly and maintenance, the elastic fit provides support and tightening for the valve core and valve stem, significantly improving connection reliability and reducing the risk of damage during maintenance, thereby further controlling maintenance costs.

[0014] The beneficial effects of this utility model are that it provides a connection mechanism for preventing valve core components from loosening. In the connection between the valve core and valve stem, a rationally designed connection structure is implemented. Based on a threaded, rigid connection, the connection points are strategically arranged, and a disc spring is added at the connection location. The disc spring provides elasticity to the valve core and valve stem, ensuring a tight and effective connection. Even during prolonged operation or media erosion, loosening between the valve core and valve stem will not occur. Angle valves using this connection mechanism have a tight and reliable connection between the valve and valve stem, effectively extending the valve's service life and reducing maintenance costs. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a perspective view of the preferred embodiment of the present invention.

[0017] Figure 2 This is a cross-sectional view of the preferred embodiment of the present invention.

[0018] Figure 3 This is a perspective view of the valve stem in the preferred embodiment of this utility model.

[0019] Figure 4 This is a perspective view of the disc spring in the preferred embodiment of this utility model.

[0020] In the diagram: 1. Valve stem; 2. Valve core body; 3. Fastening screw; 4. Protrusion; 5. Inner wall of the second-stage step; 6. Disc spring; 7. Inner wall of the first-stage step. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0022] like Figure 1 The connecting mechanism shown is a preferred embodiment of this utility model for preventing the valve core component from loosening. This connecting mechanism includes a valve core and a valve stem 1.

[0023] The valve stem 1 has a two-stage stepped countersunk hole formed in the inner face of the valve core corresponding to the valve stem. The inner walls of the countersunk hole are the first-stage inner wall 7 and the second-stage inner wall 5, respectively. The second-stage inner wall 5 is located away from the connecting end face and has internal threads.

[0024] The valve core includes a valve core body 2 and a fastening screw 3. One end of the fastening screw 3 is inserted into the countersunk hole of the valve stem. The axial cross-section of the fastening screw 3 is T-shaped, wherein the lower end of the vertical part of the T-shape is inserted into the countersunk hole of the valve stem, and the lower end has an external thread, which mates with the internal thread of the inner wall 5 of the secondary step.

[0025] In the positioning design of the valve core body 2, both ends of the valve core body 2 are axially limited by stepped surfaces to maintain a tight fit between the valve stem 1 and the valve core. The valve core body 2 is sleeved on the outer circumferential surface of the fastening screw 3, and both ends of the valve core body 2 are in frictional engagement with the valve stem 1 and the fastening screw 3, respectively, and are axially positioned relative to the fastening screw 3. The front end of the valve core body 2 has a recessed groove, and the rear end face has a recessed countersunk hole. The front end groove of the valve core body 2 is in frictional engagement with the countersunk hole end face of the valve stem and the inner wall 7 of the first-stage step. The countersunk hole of the valve core body 2 is in frictional engagement with the transverse part of the T-shape.

[0026] The T-shaped transverse portion of the fastening screw 3 has a cubic protrusion 4 on its outer end face, and the four sides of the cube become clamping surfaces. When it is necessary to tighten the fastening screw 3, pliers or other clamping tools can be used to clamp the clamping surfaces and drive the fastening screw 3 to rotate. Alternatively, a wrench with an inner hole that mates with the protrusion 4 can be used to drive the fastening screw 3 to rotate.

[0027] When the fastening screw 3, valve core body 2, and valve stem 1 are connected, an annular cavity is formed between the inner wall 7 of the first-stage step of valve stem 1, the valve core body 2, and the fastening screw 3. A disc spring 6 is installed within this annular cavity. One end face of the disc spring 6 is elastically connected to the connecting surface of the inner wall 5 of the first and second-stage steps, and the other end face is elastically connected to the valve core body 2. The compression of the disc spring 6 is controlled at around 0.5 mm, and its structure, similar to a spring washer, provides positioning support between the valve stem and the valve core.

[0028] During installation, insert the disc spring 6 into the connecting surface of the inner wall 5 of the first and second steps. Then, fit the valve core body 2 onto the outer circumference of the fastening screw 3. Next, assemble the formed valve core with the countersunk hole of the valve stem 1. Engage the threaded end of the fastening screw 3 with the internal thread of the valve stem and rotate along the thread. At this time, the end of the valve core body 2 with the mating groove will then be inserted into the valve stem, and the front end will abut against and compress the disc spring 6 until the fastening screw 3 is tightened. The valve core body 2 and the end of the valve stem 1 will fit tightly, completing the connection and assembly of the valve core and valve stem 1. At this time, the disc spring 6 has a certain amount of compression. This compression causes the disc spring 6 to apply pressure to both ends of the valve stem 1 and the valve core body 2. When this pressure is transmitted to the lateral part of the fastening screw 3, since the lateral part applies pressure in the opposite direction to the valve core body 2, the valve core body 2 can be effectively axially positioned with the valve stem 1, thereby maintaining a tight connection between the valve core and the valve stem 1. Even if the valve stem 1 becomes loose due to prolonged erosion or damage during disassembly, the compression of the disc spring 6 can offset the loosening, ensuring a tight connection between the valve stem 1 and the valve core, thereby improving the reliability of the connection.

[0029] This embodiment also provides an angle valve, which includes a valve stem 1 and a valve core. The valve stem 1 and the valve core are constructed as follows: Figure 1 The diagram illustrates a connection mechanism for preventing loosening of the valve core component. In an angle valve, this connection mechanism ensures a tight connection between the valve core and valve stem 1, preventing loosening and effectively extending the valve's service life. Even during disassembly and maintenance, the elastic fit provides support and tightening for the valve core and valve stem 1, significantly improving connection reliability and reducing the risk of damage during maintenance, thus further controlling the angle valve's maintenance costs.

[0030] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A connecting mechanism for preventing valve core components from loosening, characterized in that: Including valve core and valve stem (1); The valve stem (1) is recessed into the valve core with a two-stage stepped countersunk hole. The circumferential inner walls of the countersunk hole are a first-stage step inner wall (7) and a second-stage step inner wall (5), wherein the second-stage step inner wall (5) is located away from the connecting end face, and the second-stage step inner wall (5) has an internal thread. The valve core includes a valve core body (2) and a fastening screw (3). One end of the fastening screw (3) is inserted into the countersunk hole of the valve stem, and the outer circumferential surface of the insertion end of the fastening screw (3) has an external thread, which is engaged with the internal thread of the inner wall (5) of the second-stage step. The valve core body (2) is sleeved on the outer circumferential surface of the fastening screw (3), and the two ends of the valve core body (2) are respectively in frictional engagement with the valve stem (1) and the fastening screw (3), and are axially positioned relative to the fastening screw (3). An annular cavity is formed between the inner wall (7) of the first step of the valve stem (1), the valve core body (2), and the fastening screw (3). An elastic element is provided in the annular cavity, and the elastic element is elastically supported between the connecting surface of the inner wall (5) of the first and second steps and the end face of the valve core body (2).

2. The connecting mechanism for preventing valve core components from loosening as described in claim 1, characterized in that: The elastic element is a disc spring (6). One end face of the disc spring (6) is elastically connected to the connecting surface of the inner wall (5) of the first and second level steps, and the other end face is elastically connected to the valve core body (2).

3. A connecting mechanism for preventing valve core components from loosening as described in claim 2, characterized in that: The compression of the disc spring (6) is 0.5 mm.

4. The connecting mechanism for preventing valve core components from loosening as described in claim 1, characterized in that: The valve core body (2) has a valve core countersunk hole in the center of one end face and a mating groove in the outer periphery of the other end. The mating groove is in frictional fit with the valve stem countersunk hole end face and the inner wall (7) of the first step.

5. A connecting mechanism for preventing valve core components from loosening as described in claim 4, characterized in that: The axial section of the fastening screw (3) is T-shaped, wherein the lower end of the vertical part of the T-shape has an external thread; the valve core countersunk hole of the valve core body (2) is frictionally engaged with the transverse part of the T-shape.

6. A connecting mechanism for preventing valve core components from loosening as described in claim 5, characterized in that: The outer end face of the transverse portion of the fastening screw (3) is fixed with a protrusion (4), and the outer wall of the protrusion (4) is provided with at least two clamping surfaces.

7. An angle valve, characterized in that: It includes a valve stem and a valve core, wherein the valve stem (1) and the valve core are connected by a connection mechanism for preventing the valve core component from loosening as described in any one of claims 1 to 2.

Images