Miniature ball valve

Abstract

This utility model discloses a miniature ball valve, including a valve body, a ball valve core, a valve stem, and a handle. The ball valve core is positioned so that one side abuts against the inner limiting shoulder of the valve body's inner wall via a sealing ring, and the other side abuts against a limiting ring via a sealing ring. The limiting ring is fixed to the valve body by a retaining ring, allowing the ball valve core to form a radial seal under the compression of the sealing rings on both sides. This ensures that the rotation axis of the ball valve core coincides with the axis of the valve stem, enabling it to rotate around this axis to open and close. Therefore, fixing the valve body with a retaining ring and limiting ring simplifies manufacturing, prevents loosening during use, and makes the structure more reliable and convenient for subsequent maintenance and replacement. Simultaneously, the handle has an axially penetrating handle hole and an insert interference-fitted into the handle hole, with the bottom of the insert forming a transmission connection with the upper end of the valve stem. This prevents wear on the handle hole by the valve stem, even if the handle is made of plastic, ensuring the reliability of the structure.

Description

Technical Field

[0001] This utility model relates to a ball valve structure in pipeline valves, specifically a miniature ball valve. Background Technology

[0002] A miniature ball valve is a small-volume pipeline valve installed in special environments or confined spaces, serving functions such as control switching and flow regulation. Its structure, as disclosed in Chinese Patent No. 201620813355.7, "A Miniature Ball Valve," mainly consists of a valve body, a ball valve core housed within the valve body, a handle mounted on the top of the valve body, and valve stems at the upper and lower ends respectively connected to the handle and the ball valve core for transmission. Therefore, simply operating the handle to drive the ball valve core to rotate via the valve stem is sufficient to open and close the valve. However, in practical use, this miniature ball valve structure has several drawbacks: First, the ball valve core is installed within the valve body, with one side abutting against the inner limit shoulder of the valve body's inner wall via a sealing ring, and the other side abutting against a limit ring via a sealing ring. This limit ring is then installed within the valve body by threading, requiring internal thread machining on the inner wall of the valve body. The process can cause some inconvenience; at the same time, the threaded limit ring may loosen due to the force generated by the rotation of the ball valve core over a long period of time, which will greatly affect the reliability of the structure. If the limit ring is fixed to the valve body with glue, it will make subsequent repair and replacement impossible. Second, the transmission connection between the handle and the upper end of the valve stem of the miniature ball valve is mainly achieved by matching the polygonal through hole in the handle with the polygonal shaft at the upper end of the valve stem. If both the handle and the ball valve are made of metal, this transmission connection structure will not affect the use. However, many miniature ball valves use plastic handles, so after a period of use, the polygonal hole on the handle will be worn at the upper end of the valve stem, causing the hole diameter to increase, which will also affect the reliability of the structure. Specifically, there will be a drive delay between the handle and the valve stem, which will reduce the accuracy of the handle drive and the comfort of operation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a miniature ball valve that is simple to process and has a reliable structure.

[0004] The technical problem of this utility model is solved by the following technical solution:

[0005] A miniature ball valve includes a valve body, a ball valve core disposed within the valve body, a handle mounted on the top of the valve body, and a valve stem with its upper and lower ends respectively connected to the handle and the ball valve core for transmission. The handle drives the ball valve core to rotate via the valve stem to seal and open / close the valve. One side of the ball valve core abuts against the inner limiting shoulder of the valve body's inner wall through a sealing ring, and the other side abuts against a limiting ring through a sealing ring. The limiting ring is fixed to the valve body by a retaining ring, so that the ball valve core forms a radial seal under the compression of the sealing rings on both sides. The rotation axis of the ball valve core coincides with the axis of the valve stem, and it rotates around this axis to achieve opening and closing.

[0006] The handle has an axially through handle hole and an insert that is interference-fitted and fixed in the handle hole. The bottom of the insert is connected to the upper end of the valve stem.

[0007] The insert has a transmission block and a transmission groove that cooperate with each other and form a transmission connection between the bottom of the insert and the upper end of the valve stem.

[0008] The transmission block is a pair of symmetrically arranged protrusions at the bottom of the insert, and the transmission groove is a straight groove horizontally arranged at the upper end of the valve stem. The pair of transmission blocks are simultaneously fitted into the transmission groove to form torque transmission.

[0009] The insert has an axially through mounting hole, and a screw is inserted into the handle hole. The screw passes through the mounting hole and is connected to the upper end of the valve stem, thus securing the insert to the upper end of the valve stem.

[0010] The upper end of the valve stem is provided with a screw hole for the screw to be connected.

[0011] A positioning block is provided in the valve body below the ball valve core, and a positioning groove is provided at the bottom of the ball valve core to cooperate with the positioning block. The positioning block and the positioning groove form a rotational engagement and limit the rotation angle of the ball valve core to 90°.

[0012] The valve body is provided with an annular groove that is radially arranged around the inner wall of the valve body, and the retaining ring is embedded in the annular groove.

[0013] Compared with existing technologies, this utility model mainly involves one side of the ball valve core abutting against the inner limiting shoulder of the valve body's inner wall via a sealing ring, and the other side abutting against the limiting ring via a sealing ring. The limiting ring is then fixed to the valve body by a retaining ring, so that the ball valve core forms a radial seal under the compression of the sealing rings on both sides. This allows the rotation axis of the ball valve core to coincide with the axis of the valve stem, enabling it to rotate around this axis to achieve opening and closing. Obviously, fixing it to the valve body with a retaining ring and limiting ring is much simpler than traditional threaded fixing, eliminating the trouble of machining internal threads on the valve body's inner wall and simplifying the process. Moreover, it will not loosen under the long-term force generated by the rotation of the ball valve core, ensuring the reliability of the structure and facilitating subsequent maintenance and replacement. At the same time, the handle has an axially penetrating handle hole and an insert fixed in the handle hole with an interference fit, and the bottom of the insert forms a transmission connection with the upper end of the valve stem. In this way, since the handle hole is no longer directly connected to the upper end of the valve stem, even if the handle is a plastic handle, there will be no driving delay between the handle and the valve stem, thus ensuring the reliability of the structure. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] Figure 2 This is a sectional view of the valve body.

[0016] Figure 3 This is a schematic diagram of the ball valve core.

[0017] Figure 4 for Figure 3 The right view.

[0018] Figure 5 This is a schematic diagram of the valve stem.

[0019] Figure 6 for Figure 5 A bottom view.

[0020] Figure 7 This is a cross-sectional view of the handle.

[0021] Figure 8 for Figure 7 A cross-sectional view with the insert removed.

[0022] Figure 9 This is a cross-sectional view of the insert.

[0023] Figure 10 for Figure 9 The left view.

[0024] Figure 11 for Figure 9 Top view. Detailed Implementation

[0025] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] like Figures 1-11 As shown, 1. Valve body, 11. Inner limit shoulder, 12. Valve stem hole, 13. Annular groove, 14. Mounting groove, 2. Ball valve core, 21. Water passage hole, 22. Snap-in groove, 23. Positioning groove, 3. Handle, 31. Handle hole, 4. Valve stem, 41. Transmission groove, 42. Rib, 5. Sealing ring, 6. Insert, 61. Mounting hole, 62. Transmission block, 7. Limit ring, 8. Snap-in ring, 9. Positioning block, 10. Screw, 101. O-ring.

[0027] Miniature ball valves, such as Figure 1 As shown, this is a small-volume pipeline valve installed in special environments or confined spaces, which functions as a control switch and flow regulation valve. Its structure consists of a valve body 1, a ball valve core 2 located inside the valve body, a handle 3 installed on the top of the valve body, and valve stems 4 whose upper and lower ends are respectively connected to the handle and the ball valve core for transmission. The handle 3 drives the ball valve core 2 to rotate via the valve stem 4 to seal and open / close the valve.

[0028] The main components, such as the valve body 1, ball valve core 2, and handle 3, are all designed and manufactured using environmentally friendly CW602N copper material.

[0029] The valve body 1 is an integral component with a horizontally through water channel for medium flow. The ball valve core 2 has a horizontally through water hole 21. When the ball valve core 2 rotates and drives the water hole 21 to connect with the water channel, the valve is in the open state. When the ball valve core 2 rotates and drives the water hole 21 to be misaligned with the water channel, the valve is in the closed state.

[0030] One side of the ball valve core 2, i.e. Figure 1 As shown, the left side abuts against the inner limit shoulder 11 of the valve body body via the sealing ring 5, and the other side, i.e. Figure 1 The right side shown is abutted against the limiting ring 7 by the sealing ring 5. The limiting ring can be made of copper gasket and fixed inside the valve body 1 by the retaining ring 8. The retaining ring 8 can be directly embedded in the annular groove 13 arranged radially around the inner wall of the valve body 1. In this way, the ball valve core 2 can form a radial seal under the compression of the sealing rings 5 ​​on both sides, so that the rotation axis of the ball valve core 2 can coincide with the axis of the valve stem 4 and can rotate around the axis to realize opening and closing.

[0031] Obviously, by using the retaining ring 8 in conjunction with the limiting ring 7 to fix it inside the valve body 1, compared with the traditional threaded tightening, not only is the trouble of machining the internal thread on the inner wall of the valve body eliminated, making the machining simpler, but also it will not loosen under the force generated by the rotation of the ball valve core 2 for a long time, ensuring the reliability of the structure and facilitating subsequent maintenance and replacement.

[0032] A positioning block 9 is provided inside the valve body 1 below the ball valve core 2. The positioning block can be fixed in the mounting groove 14 on the bottom surface of the valve body using pneumatic equipment. Correspondingly, a positioning groove 23 that cooperates with the positioning block is provided at the bottom of the ball valve core 2. The positioning block 9 can support the rotation of the ball valve core 2. Moreover, through the rotational cooperation between the positioning block 9 and the positioning groove 23, the rotation angle of the ball valve core 2 can be limited to 90°. That is, the 90° rotation range is exactly the angle position from fully open to fully closed of the ball valve core 2.

[0033] The valve stem 4 is vertically rotated and sealed in the valve stem hole 12 at the top of the valve body via an O-ring 101. The lower end of the valve stem is fitted into the groove 22 at the top of the ball valve core 2 via a rib 42 to form a transmission connection. The handle 3 has an axially penetrating handle hole 31 and an insert 6 that is interference-fitted and fixed in the handle hole, i.e. Figure 7 , Figure 8 The handle hole 31 shown is designed as a stepped hole, and the insert 6 is inserted into the bottom of the handle hole and fixed by interference fit, thereby making the handle 3 and the insert 6 form an integral part.

[0034] The insert 6 is a metal insert, and its bottom is fitted into the transmission groove 41 at the upper end of the valve stem via a transmission block 62 to form a transmission connection. In this embodiment, the transmission block 62 is as follows: Figure 9 , Figure 10 The diagram shows a pair of symmetrically arranged protrusions at the bottom of the insert, while the transmission groove 41 is a straight groove horizontally arranged at the upper end of the valve stem. A pair of transmission blocks 62 can be fitted into the transmission groove 41 to form torque transmission.

[0035] Then, the insert 6 has an axially through mounting hole 61, and a screw 10 is inserted into the handle hole 31. The screw is then passed through the mounting hole 61 and directly connected to the screw hole at the upper end of the valve stem, thereby securing the insert 6 to the upper end of the valve stem.

[0036] Therefore, since the handle hole 31 is no longer directly connected to the upper end of the valve stem, even if the handle 3 is a plastic handle, the upper end of the valve stem will not wear down to the handle hole 31 and cause the hole diameter to increase after a period of use. This better avoids driving delay between the handle 3 and the valve stem 4, and also ensures the reliability of the structure.

[0037] The basic principles and main features of this utility model have been described above. Those skilled in the art should understand that this utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A miniature ball valve, comprising a valve body (1), a ball valve core (2) disposed within the valve body, a handle (3) mounted on the top of the valve body, and a valve stem (4) whose upper and lower ends are respectively connected to the handle (3) and the ball valve core (2); wherein the handle (3) drives the ball valve core (2) to rotate via the valve stem (4) to seal and open / close the valve, characterized in that... One side of the ball valve core (2) abuts against the inner limit shoulder (11) of the inner wall of the valve body (1) through the sealing ring (5), and the other side abuts against the limit ring (7) through the sealing ring (5); the limit ring is fixed in the valve body (1) by the retaining ring (8), so that the ball valve core (2) forms a radial seal under the compression of the sealing rings (5) on both sides; the rotation axis of the ball valve core (2) coincides with the axis of the valve stem (4), and rotates around the axis to realize opening and closing.

2. The miniature ball valve according to claim 1, characterized in that... The handle (3) is provided with an axially penetrating handle hole (31) and an insert (6) fixed in the handle hole (31) by interference fit. The bottom of the insert is connected to the upper end of the valve stem.

3. The miniature ball valve according to claim 2, characterized in that... The insert has a transmission block (62) and a transmission groove (41) that cooperate with each other and form a transmission connection between the bottom of the insert and the upper end of the valve stem.

4. The miniature ball valve according to claim 3, characterized in that... The transmission block (62) is a pair of symmetrically arranged protrusions at the bottom of the insert. The transmission groove (41) is a straight groove horizontally arranged at the upper end of the valve stem. The pair of transmission blocks (62) are simultaneously fitted into the transmission groove (41) to form torque transmission.

5. The miniature ball valve according to claim 2, characterized in that... The insert (6) has an axially penetrating mounting hole (61), and a screw (10) is inserted into the handle hole (31). The screw passes through the mounting hole (61) and is connected to the upper end of the valve stem, thus securing the insert (6) to the upper end of the valve stem.

6. The miniature ball valve according to claim 5, characterized in that... The upper end of the valve stem is provided with a screw hole for the screw (10) to be connected.

7. The miniature ball valve according to claim 1, characterized in that... A positioning block (9) is provided in the valve body (1) below the ball valve core (2), and a positioning groove (23) that cooperates with the positioning block (9) is provided at the bottom of the ball valve core (2). The positioning block (9) and the positioning groove (23) form a rotational fit, and limit the rotation angle of the ball valve core (2) to 90°.

8. The miniature ball valve according to claim 1, characterized in that... The valve body (1) is provided with an annular groove (13) arranged radially around the inner wall of the valve body, and the retaining ring (8) is embedded in the annular groove (13).

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