A ball valve

Abstract

The application discloses a ball valve, which comprises a valve rod sleeve, a valve rod and a valve core, wherein the valve rod comprises a rod part, a key part and a radial protruding part, the rod part is at least partially located in an axial through hole of the valve rod sleeve, the key part is at least partially located in a groove of the valve core, the radial protruding part protrudes radially from the key part, and the radial protruding part protrudes from the rod part; a lower section of the valve rod sleeve comprises an axial limiting part and a radial limiting part, the radial protruding part can abut against the radial limiting part to limit the rotating stroke of the valve rod, and the radial protruding part can abut against the axial limiting part to limit the upward axial disengagement of the valve rod. The application optimizes the stop structure of the ball valve, cancels the positioning pin relative to the background technology, does not need to process the positioning pin hole, and reduces the machining difficulty of the valve rod.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and specifically to a ball valve. Background Technology

[0002] Figure 1 This is a partial structural diagram of a ball valve in the background art. For example... Figure 1 As shown, the ball valve includes a housing 01, a valve stem 02, and a locating pin 03. A limiting boss 011 is provided at the upper end of the housing 01. The locating pin 03 is transversely inserted through the valve stem 02. By abutting against the limiting boss 011, the circumferential movement of the valve stem 02 is limited. In the prior art, ball valves rely on the cooperation between the locating pin 03 and the limiting boss 011 for stopping. The locating pin 03 is typically manually pressed into the locating pin hole 021 of the valve stem 02. The dimensional accuracy requirements of the locating pin hole 021 are high, and the machining of the valve stem 02 is quite difficult.

[0003] In view of this, how to reduce the machining difficulty of valve stems is a technical issue that continues to be of concern to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a ball valve, comprising a housing, a valve stem sleeve, a valve stem, and a valve core. The housing is fixedly connected to the valve stem sleeve, and the valve core is disposed within the inner cavity of the ball valve. The valve stem includes a rod portion, a key portion, and a radial protrusion. The rod portion is at least partially located in the axial through hole of the valve stem sleeve, and the key portion is at least partially located in the groove of the valve core. The valve stem is capable of driving the valve core to rotate. The radial protrusion protrudes radially from the key portion and protrudes beyond the rod portion. The lower section of the valve stem sleeve includes an axial limiting portion and a radial limiting portion. The radial protrusion can abut against the radial limiting portion to limit the rotational stroke of the valve stem, and the radial protrusion can abut against the axial limiting portion to limit the valve stem from axially disengaging upward.

[0005] The ball valve provided by this invention includes a valve stem sleeve, a valve stem, and a valve core. The valve stem includes a stem portion, a key portion, and a radially protruding portion. The stem portion is at least partially located in the axial through hole of the valve stem sleeve, the key portion is at least partially located in the groove of the valve core, and the radially protruding portion protrudes radially from the key portion and extends beyond the stem portion. The lower section of the valve stem sleeve includes an axially limiting portion and a radially limiting portion. The radially protruding portion can abut against the radially limiting portion to limit the rotational stroke of the valve stem, and the radially protruding portion can abut against the axially limiting portion to limit the axial upward disengagement of the valve stem. This solution optimizes the stop structure of the ball valve, eliminating the locating pin compared to the prior art, eliminating the need to machine the locating pin hole, and reducing the machining difficulty of the valve stem. Attached Figure Description

[0006] Figure 1 Background Art: A partial structural diagram of a ball valve;

[0007] Figure 2 This invention provides a cross-sectional schematic diagram of a ball valve;

[0008] Figure 3a : Figure 2 Schematic diagram of the structure of the valve stem sleeve;

[0009] Figure 3b : Figure 3a A schematic diagram of the inverted valve stem sleeve;

[0010] Figure 4 : Figure 2 Schematic diagram of the middle valve stem;

[0011] Figure 5 : Figure 2 A schematic diagram of the fit between the valve stem and the valve stem sleeve;

[0012] Figure 6 : Figure 2 Schematic diagram of the middle valve core;

[0013] Figure 7 : Figure 2 A schematic diagram showing the fit between the valve stem, valve stem sleeve, and valve core;

[0014] Figure 8 : Figure 7 Enlarged view of point I in the middle;

[0015] Figure 9 : A schematic diagram of another valve stem structure;

[0016] Figure 10 : Figure 9 Structural diagram of the middle member;

[0017] Figure 11 : Figure 9 A schematic diagram of the middle connector.

[0018] Figures 2 to 11 middle:

[0019] 1-Shell, 100-Inner cavity;

[0020] 11-Main body, 12-Protruding part;

[0021] 2-First valve seat, 21-First step portion;

[0022] 2'-Second valve seat, 21'-Second step portion;

[0023] 22' - Flow path inlet, 22' - Flow path outlet;

[0024] 3-Valve stem sleeve, 30-Axial through hole;

[0025] 31-large diameter section, 32-small diameter section, 321-lower end;

[0026] 311 - External thread portion, 312 - First tapered portion, 313 - Second tapered portion;

[0027] 33-Axial protrusion, 331-First sidewall, 332-Second sidewall;

[0028] 4 / 4' - valve stem, 41 - stem portion, 42 - key portion;

[0029] 41'-rod, 411'-positioning hole, 412'-transverse groove;

[0030] 42'-Connector, 421'-Boss, 422'-Positioning rod;

[0031] 43 - Radial protrusion;

[0032] 5-Valve core, 51-Groove, 511-Groove bottom, 52-Platform section;

[0033] 6-Valve cap, 61-Internal threaded portion, 62-Internal stepped portion;

[0034] 7-Sealing ring, 8-First sealing gasket, 8'-Second sealing gasket. Detailed Implementation

[0035] The core of this invention is to provide a ball valve, including a valve stem sleeve, a valve stem, and a valve core. The valve stem includes a stem portion, a key portion, and a radial protrusion. The stem portion is at least partially located in the axial through hole of the valve stem sleeve, the key portion is at least partially located in the groove of the valve core, and the radial protrusion protrudes radially from the key portion and extends beyond the stem portion. The lower section of the valve stem sleeve includes an axial limiting portion and a radial limiting portion. The radial protrusion can abut against the radial limiting portion to limit the rotational stroke of the valve stem, and the radial protrusion can abut against the axial limiting portion to limit the axial upward disengagement of the valve stem. This solution optimizes the stop structure of the ball valve, eliminating the locating pin compared to the prior art, eliminating the need to machine the locating pin hole, and reducing the machining difficulty of the valve stem.

[0036] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] It should be noted that the directional terms such as "up" and "down" used in this article are in the context of... Figures 2 to 11 The directional terms used in this document, defined by their location in the diagram and their relative positions, are merely for clarity and convenience in illustrating the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0038] Figure 2 A cross-sectional schematic diagram of a ball valve provided by the present invention; Figure 3a for Figure 2 Schematic diagram of the structure of the valve stem sleeve; Figure 3b for Figure 3a A schematic diagram of the inverted valve stem sleeve; Figure 4 for Figure 2 Schematic diagram of the middle valve stem; Figure 5 for Figure 2 A schematic diagram of the fit between the valve stem and the valve stem sleeve; Figure 6 for Figure 2 Schematic diagram of the middle valve core; Figure 7 for Figure 2 A schematic diagram showing the fit between the valve stem, valve stem sleeve, and valve core; Figure 8 for Figure 7 Enlarged schematic diagram of point I in the middle.

[0039] like Figures 2 to 8 As shown, the ball valve includes a housing 1, a first valve seat 2, a second valve seat 2', a valve stem sleeve 3, a valve stem 4, and a valve core 5. The housing 1 is tubular and includes a body portion 11 and a protrusion 12, the protrusion 12 protruding from the circumferential outer wall of the body portion 11. Specifically, the body portion 11 is formed by stamping and stretching stainless steel tubing or sheet metal, and the protrusion 12 is formed by punching, flanging, and stretching based on the body portion 11.

[0040] The first valve seat 2 and the second valve seat 2' are formed by forging stainless steel profiles. The valve core 5 is located between the first valve seat 2 and the second valve seat 2'. The outer peripheral wall of the first valve seat 2 includes a first step portion 21, and the outer peripheral wall of the second valve seat 2' includes a second step portion 21'. The first step portion 21 and the second step portion 21' are arranged facing each other, that is, the step surface of the first step portion 21 is opposite to the step surface of the second step portion 21'. One end of the housing 1 is placed on the first step portion 21, and the other end of the housing 1 is placed on the second step portion 21'. The first valve seat 2, the second valve seat 2', and the housing 11 are welded and fixed. The first valve seat 2 includes a flow path inlet 22, and the second valve seat 2' includes a flow path outlet 22'. A first sealing gasket 8 is provided between the first valve seat 2 and the valve core 5, and a second sealing gasket 8' is provided between the second valve seat 2' and the valve core 5.

[0041] The valve stem sleeve 3 is approximately annular in shape and is machined from a stainless steel profile. The valve stem sleeve 3 includes an axially extending through-hole 30 through which the valve stem 4 passes. The valve stem 4 is keyway connected to the valve core 5, and the valve stem 4 can drive the valve core 5 to rotate. The valve stem sleeve 3 includes an upper section and a lower section. In this embodiment, the upper section is a large-diameter section 31, and the lower section is a small-diameter section 32. The outer diameter of the large-diameter section 31 is larger than the outer diameter of the small-diameter section 32. The large-diameter section 31 serves as the upper section, and the small-diameter section 32 serves as the lower section. The small-diameter section 32 is at least partially located within the protrusion 12 of the housing 1, and its outer wall is welded and fixed to the inner wall of the protrusion 12. The small-diameter section 32 includes a lower end portion 321 and an axially protruding portion 33 extending axially downward from the lower end portion 321. The axially protruding portion 33 includes a first sidewall 331 and a second sidewall 332. The plane containing the first sidewall 331 and the plane containing the second sidewall 332 forms an angle of 90 degrees. There are two axially protruding portions 33, symmetrically arranged relative to the central axis of the axial through hole 30. In this embodiment, the lower end portion 321 of the small-diameter section 32 serves as an axial limiting portion, and the axially protruding portion 33 serves as a radial limiting portion.

[0042] The valve stem 4 is machined from a single piece of stainless steel bar stock and includes a stem portion 41, a key portion 42, and a radial protrusion 43. The key portion 42 is located below the stem portion 41. The stem portion 41 is cylindrical and passes through the axial through hole 30 of the valve stem sleeve 3, with at least a portion of the stem portion 41 located within the axial through hole 30. The key portion 42 is at least partially located within the groove 51 of the valve core 5, and rotation of the valve stem 4 can drive the valve core 5 to rotate. The radial protrusion 43 protrudes radially from the key portion 42 and extends beyond the outer peripheral wall of the stem portion 41. The radial protrusion 43 can abut against the first side wall 331 or the second side wall 332 of the axial protrusion 33 (radial limiting portion) to limit the rotational stroke of the valve stem 4. The radial protrusion 43 can also abut against the lower end 321 (axial limiting portion) of the small diameter section 32 to prevent the valve stem 4 from axially disengaging upwards.

[0043] In this embodiment, by providing an axial limiting part and a radial limiting part in the lower section of the valve stem sleeve 3, the valve stem 4 includes a stem portion 41, a key portion 42, and a radial protrusion 43. The stem portion 41 is at least partially located in the axial through hole 30 of the valve stem sleeve 3, the key portion 42 is at least partially located in the groove 51 of the valve core 5, and the radial protrusion 43 protrudes from the outer peripheral wall of the stem portion 41. The radial protrusion 43 can abut against the first side wall 331 or the second side wall 332 of the axial protrusion 33 (radial limiting part) to limit the rotational stroke of the valve stem 4, and the radial protrusion 43 can abut against the lower end 321 (axial limiting part) of the small diameter section 32 to limit the axial upward disengagement of the valve stem 4. This embodiment optimizes the stop structure of the ball valve, eliminates the locating pin compared to the prior art, and eliminates the need to machine the locating pin hole in the valve stem 4. Its advantages are that it reduces the machining difficulty of the valve stem; on the other hand, it can shorten the length of the valve stem 4, which is conducive to miniaturization.

[0044] Furthermore, such as Figure 2 , Figure 3a , Figure 3b As shown, the ball valve also includes a valve cap 6 and a sealing ring 7. The outer wall of the large-diameter section 31 of the valve stem sleeve 3 includes an external thread 311, and the inner wall of the valve cap 6 includes an internal thread 61. The valve cap 6 is fixedly connected to the valve stem sleeve 3 by screwing the external thread 311 and the internal thread 61 together. The upper section of the large-diameter section 31 includes a first cone 312, the outer diameter of which gradually decreases away from the valve core 5, that is, its cone surface is approximately facing the valve cap 6. The valve cap 6 also includes an inner step 62 with the stepped surface facing downward. The sealing ring 7 is located between the inner step 62 and the first cone 312. By tightening the valve cap 6, the sealing ring 7 is pressed against the first cone 312, improving the sealing performance of the ball valve.

[0045] Furthermore, the lower section of the large-diameter section 31 includes a second cone 313, the outer diameter of which gradually increases in the direction away from the valve core 5, that is, its cone surface is approximately facing the valve core 5. Thus, by providing the second cone 313, during the ball valve manufacturing process, the welding ring (not shown) can easily be inserted along the cone surface of the second cone 313 between the upper end of the protrusion 12 of the housing 1 and the second cone 313, facilitating the installation of the welding ring and improving production efficiency.

[0046] Figure 9 This is a schematic diagram of another type of valve stem. Figure 10 for Figure 9 Structural diagram of the middle member; Figure 11 for Figure 9 A schematic diagram of the middle connector.

[0047] like Figure 9 , Figure 10 , Figure 11 As shown, the valve stem can also be configured as a split structure. The valve stem 4' includes a rod 41' and a connector 42'. The rod portion 41 is located on the rod 41', and the key portion 42 and the radial protrusion 43 are located on the connector 42'. Specifically, the lower section of the rod 41' is provided with a transverse groove 412', and the upper section of the connector 42' is provided with a boss 422'. The rod 41' and the connector 42' are connected by the transverse groove 412' and the boss 422', and the rod 41' can drive the connector 42' to rotate. Furthermore, to make the positioning of the rod 41' and the connector 42' more reliable, the rod 41' is also provided with an axial positioning hole 411'. Correspondingly, the upper section of the connector 42' is provided with a positioning rod 421', which is located in the positioning hole 411'. In this embodiment, the rod 41' is machined from stainless steel bar stock, and the connector 42' is integrally formed by metal powder metallurgy. Compared to the integrated valve stem machining solution in the above embodiments, this design can reduce material costs.

[0048] In this embodiment, as Figure 7, Figure 8 As shown, the bottom 511 of the groove 51 is designed as a flat-bottom structure, and correspondingly, the key 42 of the valve stem 4 that cooperates with it is also designed as a flat-bottom structure, that is, the key 42 is flat-bottomed. With this design, when the ball valve is closed, it is beneficial for the valve core 5 to move towards the flow path outlet 22' side under the action of fluid pressure difference, thereby pressing the second sealing gasket 8' to improve the sealing performance; on the other hand, it makes the valve core 5 less prone to shaking, and will not scratch the first sealing gasket 8 and the second sealing gasket 8' that it cooperates with due to the shaking of the valve core 5, which can improve the service life of the first sealing gasket 8 and the second sealing gasket 8'.

[0049] Furthermore, such as Figure 8 As shown, in this embodiment, a gap A is provided between the key portion 42 and the bottom 511 of the groove 51. The dimension of the key portion 42 extending into the groove 51 is defined as B, satisfying A≤B / 2. This configuration improves the reliability of the ball valve's operation during opening and closing.

[0050] like Figure 2 As shown, the lower section of the valve core 5 has a platform portion 52, which is located between the first sealing gasket 8 and the second sealing gasket 8'. In this way, on the one hand, the material cost and weight of the valve core 5 are reduced, and on the other hand, the reduced height of the valve core 5 makes it easier to install the valve core 5 into the housing 1, which also helps to reduce the overall height of the ball valve and achieve miniaturization.

[0051] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A ball valve, characterized in that It includes a housing, a valve stem sleeve, a valve stem, and a valve core, wherein the housing is fixedly connected to the valve stem sleeve, and the valve core is disposed in the inner cavity of the housing; The valve stem includes a stem portion, a key portion, and a radial protrusion. The stem portion is at least partially located in the axial through hole of the valve stem sleeve, and the key portion is at least partially located in the groove of the valve core. The valve stem can drive the valve core to rotate. The radial protrusion protrudes radially from the key portion and protrudes beyond the stem portion. The lower section of the valve stem sleeve includes an axial limiting portion and a radial limiting portion. The radial protrusion can abut against the radial limiting portion to limit the rotational stroke of the valve stem, and the radial protrusion can abut against the axial limiting portion to limit the valve stem from axially disengaging upwards. The valve stem sleeve includes a large-diameter section and a small-diameter section. The outer diameter of the large-diameter section is larger than the outer diameter of the small-diameter section. The small-diameter section includes a lower end and an axially protruding part that axially protrudes downward from the lower end. The lower end serves as the axial limiting part, and the axially protruding part serves as the radial limiting part.

2. The ball valve of claim 1, wherein The housing includes a body portion and an extension portion extending from the circumferential outer wall of the body portion. The body portion and the extension portion are tubular. The small-diameter section is at least partially located within the extension portion, and the extension portion is fixedly connected to the small-diameter section.

3. The ball valve of claim 2, wherein The axial protrusion includes a first sidewall and a second sidewall, and the angle θ formed by the plane containing the first sidewall and the plane containing the second sidewall is 90 degrees.

4. The ball valve of claim 3, wherein It also includes a valve cap and a sealing ring. The outer wall of the large-diameter section includes an external thread, and the inner wall of the valve cap includes an internal thread. The valve cap is screwed into the valve stem sleeve. The upper section of the large-diameter section includes a first cone. The outer diameter of the first cone gradually decreases in the direction away from the valve core. The valve cap also includes an inner step with the stepped surface facing downward. The sealing ring is located between the inner step and the first cone.

5. The ball valve of claim 3, wherein The lower section of the large-diameter section includes a second cone portion, the outer diameter of which gradually increases in the direction away from the valve core.

6. The ball valve as described in claim 1, characterized in that, The groove is a through groove with a flat bottom. The key is flat and there is a gap between the key and the bottom of the groove. Let A be the gap and B be the dimension by which the key extends into the groove. Then A ≤ B / 2.

7. The ball valve of claim 1, wherein The valve stem includes a rod and a connector. The lower section of the rod includes a radially extending transverse groove. The upper section of the connector includes a boss located in the transverse groove. The rod includes the rod portion. The connector includes the key portion and the radially protruding portion.

8. The ball valve of claim 7, wherein, The rod also includes a positioning hole, and the connector also includes a positioning rod located in the positioning hole. The rod is machined from stainless steel, and the connector is made of metal powder metallurgy.

9. A ball valve according to any one of claims 1-8, characterized in that It also includes a first valve seat, a second valve seat, a first sealing gasket, and a second sealing gasket. The valve core is located between the first valve seat and the second valve seat. The first sealing gasket is located between the first valve seat and the valve core. The second sealing gasket is located between the second valve seat and the valve core. The lower section of the valve core includes a platform portion, which is located between the first sealing gasket and the second sealing gasket.

10. The ball valve as claimed in claim 9, characterized in that, The outer wall of the first valve seat includes a first stepped portion, and the outer wall of the second valve seat includes a second stepped portion. The first stepped portion and the second stepped portion are arranged facing each other. One end of the housing is placed on the first stepped portion, and the other end of the housing is placed on the second stepped portion.

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