Ball valve and manufacturing method thereof

Abstract

The invention discloses a ball valve and a manufacturing method of the ball valve. The ball valve comprises a valve body component, a valve element ball and a valve rod. The valve body part is provided with a valve cavity, a first connector part and a second connector part, and the center line of the first connector part is perpendicular to the center line of the second connector part; the valve element ball is rotatably arranged in the valve cavity, the valve element ball is provided with an L-shaped flow channel, the L-shaped flow channel comprises a first flow channel section and a second flow channel section, the axis of the first flow channel section is perpendicular to the axis of the second flow channel section, and the joint of the first flow channel section and the second flow channel section is in arc transition; the valve rod can drive the valve element ball to rotate so as to connect or disconnect a channel between the first connector part and the second connector part. The ball valve can be applied to the application scene that the axis of an inlet pipeline is perpendicular to the axis of an outlet pipeline, pressure drop generated when a refrigerant flows through can be reduced, and the energy efficiency of a system can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of fluid control, and particularly relates to a ball valve and a manufacturing method thereof. Background Art

[0002] In a multi-split air conditioner system, a stop and service valve is usually installed between the outdoor unit and the indoor unit to facilitate cutting off the refrigerant circuit, preventing refrigerant leakage during maintenance of one end, and can also be used for vacuum pumping and refrigerant addition.

[0003] A typical stop and service valve is a T-shaped stop valve, which mainly includes a valve body component, a valve stem, and a valve core, etc.; the valve body component has an inlet flow channel, an outlet flow channel, and a valve port part connecting the inlet flow channel and the outlet flow channel, and the axes of the inlet flow channel and the outlet flow channel are perpendicularly arranged; the valve stem is threadedly connected and matched with the valve body component, and by applying torque to the valve stem, the valve stem rotates relative to the valve body to close or open the valve port part, realizing the truncation or conduction of the passage between the inlet flow channel and the outlet flow channel. The valve core is installed on the valve body component, and refrigerant can be added through the valve core.

[0004] The axes of the inlet flow channel and the outlet flow channel of this stop valve are perpendicular, and there is a right-angle turn during the fluid flow, resulting in a large pressure drop and obvious throttling, which is not conducive to improving the energy efficiency of the unit; when opening and closing the valve, it is necessary to use a special wrench to rotate the valve stem, and it needs to be rotated several times repeatedly from fully open to fully closed or from fully closed to fully open, with a long valve stem stroke and inconvenient operation. At the same time, the seal between the valve stem and the valve body component is a hard seal structure of metal-to-metal extrusion. As the number of switch operations increases, the wear between the valve stem and the valve body component will increase, resulting in inability to seal and a low service life in terms of use and operation.

[0005] In view of this, how to provide a stop and service valve to improve the energy efficiency of the system is a technical problem that needs to be solved by those skilled in the art currently. Summary of the Invention

[0006] The purpose of the present application is to provide a ball valve and a manufacturing method thereof. This ball valve can be applied to application scenarios where the axes of the inlet pipeline and the outlet pipeline are perpendicular, can reduce the pressure drop generated when the refrigerant flows through, and is beneficial to improving the energy efficiency of the system.

[0007] To solve the above technical problems, the present application provides a ball valve, including a valve body component, a valve core ball, and a valve stem;

[0008] The valve body component has a valve cavity, a first interface part, and a second interface part, and the center line of the first interface part is perpendicular to the center line of the second interface part;

[0009] The valve core ball is rotatably arranged in the valve cavity. The valve core ball has an L-shaped flow channel, which includes a first flow channel section and a second flow channel section. The axis of the first flow channel section is perpendicular to the axis of the second flow channel section, and the connection between the first flow channel section and the second flow channel section is in arc transition;

[0010] The valve stem can drive the valve core ball to rotate to conduct or cut off the passage between the first interface part and the second interface part.

[0011] In an implementable solution, the valve body component includes a valve tube, a valve seat and a valve end cover;

[0012] The valve tube is a tubular structure with openings at both ends, and the first interface part is arranged on the tube wall of the valve tube;

[0013] One end of the valve seat is fixedly connected to an open end of the valve tube, and the other end of the valve seat forms the second interface part;

[0014] The valve end cover plugs the other open end of the valve tube;

[0015] The valve seat has a first step part with a step surface facing the valve end cover, and the valve end cover has a second step part with a step surface facing the valve end cover. A first sealing gasket is arranged on the first step part, and a second sealing gasket is arranged on the second step part. The first sealing gasket and the second sealing gasket are used to support the valve core ball.

[0016] In an implementable solution, a first cavity is formed between the valve end cover, the second sealing gasket and the valve core ball. The valve core ball is provided with a balance channel, and the balance channel communicates the closed cavity and the L-shaped flow channel.

[0017] In an implementable solution, a first cavity is formed between the second valve cavity, the second sealing gasket and the valve core ball, and a second cavity is formed between the first sealing gasket, the second sealing gasket, the valve core ball and the valve tube;

[0018] The second sealing gasket is provided with a balance channel, and the balance channel communicates the first cavity and the second cavity.

[0019] In an implementable solution, the ball valve further includes a first connecting pipe, a second connecting pipe and a filling valve; the first connecting pipe is fixedly connected to the first interface part, and the second connecting pipe is fixedly connected to the second interface part; the second connecting pipe is arranged horizontally, and the filling valve is installed on the second connecting pipe.

[0020] In an implementable solution, the valve body component, the valve core ball and the valve stem are all made of stainless steel.

[0021] This application also provides a manufacturing method of a ball valve, including:

[0022] Use stainless steel sheets or stainless steel pipes to separately process and prepare a valve tube, a valve seat, and a valve end cap; wherein, the valve tube is a tubular member with openings at both ends, and a first interface portion communicating with the tube cavity is provided on the tube wall of the valve tube; the valve seat includes a first stepped portion and a second interface portion; the valve end cap includes a second stepped portion; weld and fix the valve seat to one open end of the valve tube, such that the stepped surface of the first stepped portion faces the tube cavity of the valve tube, and the second interface portion communicates with the tube cavity of the valve tube; weld and fix the valve end cap to the other open end of the valve tube, such that the valve end cap seals the other open end of the valve tube.

[0023] In an implementable solution, before welding and fixing the valve seat to the valve tube, first assemble a first assembly component;

[0024] The assembly of the first assembly component includes:

[0025] Use steel to separately process and prepare a joint and a first connecting pipe. A flanging portion is further provided on the tube wall of the valve tube. The flanging portion and the first interface portion are opposite in position, and the flanging portion communicates with the tube cavity of the valve tube;

[0026] Weld and fix the joint to the flanging portion. The inner hole of the joint communicates with the tube cavity of the valve tube, and weld and fix the first connecting pipe to the first interface portion.

[0027] In an implementable solution, the assembly of the first assembly component further includes:

[0028] Use steel to process and prepare a retaining ring. Two convex portions protruding radially inward are provided on the inner wall of the retaining ring. The two convex portions are evenly arranged along the circumferential direction of the retaining ring; an installation groove is further provided at one end of the joint away from the valve tube;

[0029] Weld and fix the retaining ring to the joint, and the retaining ring is located within the installation groove.

[0030] In an implementable solution, before welding and fixing the valve seat and the valve tube, first assemble a second assembly component;

[0031] The assembly of the second assembly component includes:

[0032] Use steel to process and prepare a second connecting pipe, and prepare a filling valve body; an installation interface portion is provided on the tube wall of the second connecting pipe;

[0033] Weld and fix the second connecting pipe to the second interface portion of the valve seat, and weld and fix the filling valve body to the installation interface portion.

[0034] In an implementable solution, the manufacturing method further includes:

[0035] Prepare a valve core ball, a first sealing gasket and a second sealing gasket; the valve core ball has an L-shaped flow channel, the L-shaped flow channel includes a first flow channel section and a second flow channel section, the axis of the first flow channel section is perpendicular to the axis of the second flow channel section, and the connection between the first flow channel section and the second flow channel section is an arc transition;

[0036] Before the valve seat is welded to the valve tube, the first sealing gasket is placed on the step surface of the first step portion, and the valve core ball is installed into the valve tube so that the first flow channel section of the valve core ball is aligned with the first interface portion and abuts against the first sealing gasket;

[0037] Before the valve end cover is welded to the valve tube, the second sealing gasket is placed on the step surface of the second step portion, and the valve end cover is welded and fixed to the other open end of the valve tube so that the second sealing gasket abuts against the valve core ball.

[0038] In a feasible solution, when the valve core ball is installed in the valve tube, the valve stem assembly and the valve core ball are also assembled together synchronously; the valve stem assembly includes a valve stem and a sealing ring fixedly sleeved outside the valve stem.

[0039] In a feasible solution, the valve tube, the valve seat and the valve end cover are formed by stamping or stretching.

[0040] Compared with conventional stop valves, in the ball valve and the manufacturing method of the ball valve provided in the present scheme, an L-shaped flow channel is arranged on the valve core ball to realize the circulation of refrigerant between two connecting pipes with perpendicular axes. The L-shaped flow channel has an arc transition at the turning point. In this way, the pressure drop of the refrigerant when passing through the ball valve is small. Under the condition of the same flow area, the flow rate of the ball valve can be increased by about 20% compared with the conventional stop valve, which can effectively improve the energy efficiency of the system. In other words, on the basis of meeting the same flow requirements, the volume of the ball valve can be designed to be smaller than that of the stop valve, which can reduce material usage and save costs.

[0041] In addition, the ball valve realizes the switching of the on-off valve by driving the valve stem to rotate the valve core ball. The valve stem only needs to be rotated 90°, and the valve stem can be operated with an ordinary wrench. No special tools are required, and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the structure of a ball valve provided in an embodiment of the present application;

[0043] Figure 2 for Figure 1 A cross-sectional view of the ball valve shown;

[0044] Figure 3 for Figure 2 Schematic diagram of the structure of the middle valve stem assembly;

[0045] Figure 4 is Figure 2 a schematic structural view of the middle valve cap assembly;

[0046] Figure 5 is Figure 2 a schematic structural view of the stop moving coil;

[0047] Figure 6 a schematic structural view of the first assembly of the ball valve provided by the embodiment of the present application;

[0048] Figure 7 is Figure 6 a cross-sectional view of the first assembly shown;

[0049] Figure 8 a schematic structural view of the first assembly component of the ball valve provided by the embodiment of the present application;

[0050] Figure 9 is Figure 8 a cross-sectional view of the first assembly component shown;

[0051] Figure 10 a schematic structural view of the second assembly component of the ball valve provided by the embodiment of the present application;

[0052] Figure 11 is Figure 10 a cross-sectional view of the second assembly component shown;

[0053] Figure 12 a schematic structural view of the third assembly component of the ball valve provided by the embodiment of the present application;

[0054] Figure 13 is Figure 12 a cross-sectional view of the third assembly component shown;

[0055] Figure 14 a schematic structural view of the fourth assembly component of the ball valve provided by the embodiment of the present application;

[0056] Figure 15 is Figure 14 a cross-sectional view of the fourth assembly component shown.

[0057] Explanation of reference numerals:

[0058] Valve body component 10, valve cavity 10a, first cavity 101a, second cavity 102a, valve pipe 11, first interface portion 111, flanging portion 112, valve seat 12, first step portion 121, first base portion 1211, first connection portion 1212, second interface portion 122, valve end cover 13, second step portion 131, second base portion 1311, second connection portion 1312; first gasket 141, second gasket 142;

[0059] Spool ball 20, L-shaped flow channel 21, first flow channel section 211, second flow channel section 212, balance channel 22;

[0060] Valve stem assembly 30, valve stem 31, limiting step surface 311, first sealing ring 32;

[0061] Adapter 40, limiting part 41, mounting groove 42;

[0062] Stop ring 50, convex part 51;

[0063] Valve cap assembly 60, valve cap 61, second sealing ring 62;

[0064] First connecting pipe 71, second connecting pipe 72, mounting interface part 721, pipe joint 73;

[0065] Filling valve 80, filling valve body 81, valve core 82, filling valve cap 83;

[0066] First assembly component 1A, first assembled part 11A, second assembly component 2A, third assembly component 3A, fourth assembly component 4A. Detailed implementation mode

[0067] In order to enable those skilled in the art to better understand the solution of this application, the following further detailed description of this application will be given in conjunction with the drawings and specific implementation modes.

[0068] Please refer to Figure 1 and Figure 2 , Figure 1 , which is a schematic structural diagram of the ball valve provided by the embodiment of this application; Figure 2 is Figure 1 the cross-sectional view of the ball valve shown.

[0069] The ball valve provided by this implementation scheme can be used in the air-conditioning multi-connected unit system for household use. For example, it is arranged between the outdoor unit and the indoor unit, can cut off the refrigerant circuit, and can prevent refrigerant leakage when one end is being repaired. Specifically, the ball valve can be connected between two pipelines with perpendicular axes, used to replace the conventional globe valve, and avoid changing the existing pipeline layout of the system.

[0070] In this implementation scheme, the ball valve includes a valve body component 10, a spool ball 20 and a valve stem assembly 30. The valve body component 10 has a valve cavity 10a, a first interface part 111 and a second interface part 122, and the center line of the first interface part 111 is perpendicular to the center line of the second interface part 122.

[0071] In specific implementation, the first interface part 111 is used to connect the first connecting pipe 71, the second interface part 122 is used to connect the second connecting pipe 72, and the first connecting pipe 71 and the second connecting pipe 72 can be further connected to the relevant pipelines in the system.

[0072] The valve core ball 20 is rotatably arranged in the valve cavity 10a of the valve body component 10. The valve core ball 20 has an L-shaped flow channel 21, which includes a first flow channel section 211 and a second flow channel section 212. The axis of the first flow channel section 211 is perpendicular to the axis of the second flow channel section 212, and the connection between the first flow channel section 211 and the second flow channel section 212 is smoothly transitioned.

[0073] The valve rod assembly 30 includes a valve rod 31. A part of the valve rod 31 can extend into the valve cavity 10a to cooperate with the valve core ball 20. The valve rod 31 can drive the valve core ball 20 to rotate to conduct or cut off the passage between the first interface part 111 and the second interface part 122. It can be understood that when the valve core ball 20 is in the position of conducting the passage between the first interface part 111 and the second interface part 122, the L-shaped flow channel 21 of the valve core ball 20 communicates with the first interface part 111 and the second interface part 122. When the valve core ball 20 is in the position of cutting off the passage between the first interface part 111 and the second interface part 122, the valve core ball 20 closes the first interface part 111 or the second interface part 122.

[0074] In one implementation, taking Figure 2 the shown orientation, the first interface part 111 is located below the valve body component 10, the center line of the first interface part 111 extends along the up and down direction in the figure, the second interface part 122 is located on the side of the valve body component 10, and the center line of the second interface part 122 extends along the left and right direction in the figure. The assembly configuration of the valve core ball 20 in the valve body component 10 is: the first flow channel section 211 of the valve core ball 20 is aligned with the first interface part 111 and is always in a state of communicating with the first interface part 111. The second flow channel section 212 of the valve core ball 20 can be aligned with the second interface part 122 by rotation. The valve rod 31 connected and cooperating with the valve core ball 20 is located above the valve core ball 20 and corresponds to the position of the first flow channel section 211. In this way, when the valve rod 31 drives the valve core ball 20 to rotate, the communication state between the second flow channel section 212 and the second interface part 122 can be changed, so as to realize the switching between opening and closing the valve. In other words, when the valve rod 31 drives the valve core ball 20 to rotate to the open valve position, that is Figure 2 the position shown in the second flow channel section 212 communicates with the second interface part 122. At this time, the first interface part 111 can be conducted with the second interface part 122 through the first flow channel section 211 and the second flow channel section 212, and the refrigerant can flow between the first connecting pipe 71 and the second connecting pipe 72. When the valve rod 31 drives the valve core ball 20 to rotate to the closed valve position, the second flow channel section 212 deviates from the second interface part 122, and the valve core ball 20 closes the second interface part 122. At this time, the passage between the first interface part 111 and the second interface part 122 is cut off, and the refrigerant cannot flow between the first connecting pipe 71 and the second connecting pipe 72.

[0075] With the above solution, the first nozzle 71 and the second nozzle 72 are connected through the L-shaped flow channel 21 of the valve core ball 20. The connection between the first flow channel section 211 and the second flow channel section 212 of the L-shaped flow channel 21 has an arc transition. The refrigerant directly flows between the first nozzle 71 and the second nozzle 72 through the L-shaped flow channel 21. The pressure drop of the refrigerant in the L-shaped flow channel 21 is smaller than that of a conventional globe valve. Through experimental comparison, when the flow area is the same, using this ball valve, the flow rate can be increased by about 20%, which can effectively improve the system energy efficiency. On the basis of meeting the same flow rate requirements, the main components of the ball valve can be designed relatively smaller, reducing the use of materials and saving costs.

[0076] In addition, this ball valve realizes the switching of opening and closing the valve by driving the valve core ball 20 to rotate through the valve stem 31. The valve stem 31 only needs to rotate 90°. The operation of the valve stem 31 can be carried out with an ordinary wrench without the need for specific tools, and the operation is convenient.

[0077] In this implementation scheme, the valve body component 10 includes a valve tube 11, a valve seat 12 and a valve end cover 13.

[0078] The valve tube 11 is a tubular structure with openings at both ends. The pipe wall of the valve tube 11 is provided with the aforementioned first interface portion 111. In a specific implementation, a through hole communicating with the lumen of the valve tube 11 is opened on the pipe wall of the valve tube 11. The peripheral wall of the through hole is folded away from the lumen of the valve tube 11 to form a folded edge, and this folded edge serves as the first interface portion 111, which is convenient for connecting with the first nozzle 71. In the illustrated orientation, the first interface portion 111 is located below the valve tube 11, and the center line of the first interface portion 111 is perpendicular to the axial direction of the valve tube 11.

[0079] One end of the valve seat 12 is fixedly connected to an open end of the valve tube 11, and the other end of the valve seat 12 forms a second interface portion 122. The second interface portion 122 is used for connecting with the second nozzle 72. It can be understood that the valve seat 12 communicates with the lumen of the valve tube 11.

[0080] The valve end cover 13 plugs the other open end of the valve tube 11. The valve end cover 13 and the valve seat 12 are arranged oppositely. In Figure 2 the illustrated orientation, the valve end cover 13 plugs the left open end of the valve tube 11, and the valve seat 12 is connected to the right open end of the valve tube 11.

[0081] A valve cavity 10a is formed between the valve tube 11, the valve end cover 13 and the valve seat 12, and the aforementioned valve core ball 20 is located in this valve cavity 10a.

[0082] The valve seat 12 has a first step portion 121 with a stepped surface facing the valve end cover 13, and the valve end cover 13 has a second step portion 131 with a stepped surface facing the valve seat 12. That is to say, the stepped surfaces of the first step portion 121 and the second step portion 131 face each other. A first gasket 141 is provided on the first step portion 121, and a second gasket 142 is provided on the second step portion 131. The valve core ball 20 is supported by the first gasket 141 and the second gasket 142. In this way, the sealing performance can be ensured and refrigerant internal leakage can be avoided.

[0083] The soft seal exists between the valve core ball 20, the first gasket 141 and the second gasket 142. This sealing structure is conducive to achieving high-life operation. After testing, the operation of the valve core ball 20 can reach more than 200 times; when the valve is opened and closed many times, the wear of the gasket and the valve core ball 20 is limited, and the sealing performance can still be well guaranteed.

[0084] Exemplarily, the first gasket 141 and the second gasket 142 can be made of PTFE gaskets, which have good compression resilience and high strength.

[0085] In an implementation solution, the valve seat 12 includes a first base portion 1211 and a first connecting portion 1212. The first base portion 1211 has an annular structure. The first connecting portion 1212 extends from the outer edge portion of the first base portion 1211 toward the side where the valve end cover 13 is located. The first connecting portion 1212 and the first base portion 1211 form the aforementioned first step portion 121. The valve seat 12 is connected to the valve pipe 11 through the first connecting portion 1212. Specifically, the first connecting portion 1212 can be inserted into the valve pipe 11 and fixed to the valve pipe 11 by welding.

[0086] The second interface portion 122 of the valve seat 12 extends from the inner edge portion of the first base plate 1211 in a direction away from the valve cavity 10a. The second interface portion 122 can be inserted into the second connecting pipe 72 and fixed to the second connecting pipe 72 by welding.

[0087] As Figure 2 shown, the cross-section of the valve seat 12 is generally Z-shaped.

[0088] In a specific implementation, the valve seat 12 is an integrally formed part and can be formed by stamping and / or stretching a sheet material.

[0089] In one implementation, the valve end cap 13 includes a cap body. The middle of the cap body is recessed away from the valve core ball 20 to avoid the valve core ball 20 and cooperate with the valve pipe 11 to form a space sufficient to accommodate the valve core ball 20. The outer edge portion of the cap body is a second base portion 1311 in an annular structure. The outer edge portion of the second base portion 1311 extends toward the side where the valve seat 12 is located to form a second connecting portion 1312. The second base portion 1311 and the second connecting portion 1312 constitute the aforementioned second step portion 131. The valve end cap 13 is connected to the valve pipe 11 through the second connecting portion 1312. Specifically, the second connecting portion 1312 can be inserted into the valve pipe 11 and fixed to the valve pipe 11 by welding.

[0090] In this implementation, the ball valve further includes a joint 40. The joint 40 is fixedly connected to the valve pipe 11 and is used for installing the valve stem assembly 30. The valve pipe 11 further includes a flanging portion 112. The flanging portion 112 is opposite to the position of the first interface portion 111. The joint 40 is specifically fixedly connected to the flanging portion 112.

[0091] Specifically, the valve pipe 11 is provided with an installation hole in the pipe wall. The hole wall of the installation hole is folded away from the lumen of the valve pipe 11 to form the flanging portion 112. A part of the joint 40 can be inserted and fixed to the flanging portion 112.

[0092] The joint 40 has an inner hole. The lower end of the valve stem 31 of the valve stem assembly 30 can extend into the valve cavity 10a through the joint 40 and be in limit fit with the valve core ball 20 to drive the valve core ball 20 to rotate. It can be understood that the valve stem 31 can rotate relative to the joint 40.

[0093] Please refer to Figure 3 , Figure 3 for Figure 2 the structural schematic diagram of the valve stem assembly in

[0094] To ensure the sealing performance, the valve stem assembly 30 further includes a first sealing ring 32. The first sealing ring 32 is sleeved on the valve stem 31. After the valve stem assembly 30 and the joint 40 are installed, the first sealing ring 32 is located between the valve stem 31 and the joint 40 to form a seal.

[0095] To improve the sealing effect, the valve stem assembly 30 can be provided with two first sealing rings 32. The two first sealing rings 32 are arranged along the length direction of the valve stem 31.

[0096] In a specific implementation, an installation groove can be provided on the outer peripheral wall of the valve stem 31 for installing the first sealing ring 32, which is convenient for processing.

[0097] Please refer to Figure 4 , Figure 4 for Figure 2 the structural schematic diagram of the valve cap assembly in

[0098] The ball valve also includes a valve bonnet assembly 60, which includes a valve bonnet 61 and a second sealing ring 62. The valve bonnet 61 is fixed to the joint 40 to protect the valve stem assembly 30. The second sealing ring 62 is arranged between the valve bonnet 61 and the joint 40 to form a secondary seal and improve the sealing effect of the ball valve.

[0099] In a specific implementation, the valve bonnet 61 and the connector 40 can be fixed by a threaded fitting pair, wherein an external threaded portion is provided on the valve bonnet 61, and an internal threaded portion threadedly connected to the external threaded portion is provided on the connector 40.

[0100] In a specific implementation, a mounting groove for mounting the second sealing ring 62 may be provided inside the valve bonnet 61. After the valve bonnet 61 and the joint 40 are screwed and fixed, the second sealing ring 62 is squeezed between the mounting groove and the top end surface of the joint 40 to achieve sealing.

[0101] In a specific implementation, in order to limit the rotation angle of the valve stem 31 driving the valve core ball 20, the ball valve is further provided with a stop ring 50, which is fixedly connected to the joint 40, and the upper end of the valve stem 31 passes through the joint 40 and can cooperate with the stop ring 50 in the circumferential direction. Specifically, the inner circumferential wall of the stop ring 50 is provided with two convex parts 51 protruding radially inward, and the two convex parts 51 are evenly arranged in the circumferential direction. The valve stem 31 can rotate within a range of 90° in the circumferential direction under the restriction of the two convex parts 51 to realize the switch valve.

[0102] The structure of the retaining ring 50 can be referred to Figure 2 Understand, please refer to Figure 6 and Figure 7 , Figure 6 A schematic diagram of the structure of a first assembly of a ball valve provided in an embodiment of the present application; Figure 7 for Figure 6 A cross-sectional view of the first assembly is shown.

[0103] In a specific implementation, a mounting groove 42 is provided at the top of the joint 40 , and the retaining ring 50 can be disposed in the mounting groove 42 . The retaining ring 50 and the joint 40 can be fixed by welding.

[0104] In a specific implementation, in order to prevent the valve stem 31 from escaping from the upper end opening of the joint 40 along its length direction, a limiting portion 41 protruding radially inward can be provided on the inner circumferential wall of the joint 40, and the valve stem 31 has a limiting step surface 311 facing the limiting portion 41. After the valve stem 31 and the joint 40 are installed, the limiting step surface 311 is located below the limiting portion 41 and can be abutted against the limiting portion 41, thereby limiting the relative position of the valve stem 31 and the joint 40 in the length direction of the valve stem 31.

[0105] Refer to Figure 2, in this embodiment, on the basis that the valve cavity 10a of the ball valve is internally provided with a first gasket 141, a second gasket 142 and a valve core ball 20, it is partitioned to form a first cavity 101a and a second cavity 102a. Among them, the first cavity 101a is located between the valve end cover 13, the second gasket 142 and the valve core ball 20, and the second cavity 102a is located between the valve pipe 11, the valve core ball 20, the first gasket 141 and the second gasket 142. It can be seen from the figure that the first cavity 101a is a closed cavity, and the second cavity 102a can be communicated with the first connecting pipe 71 through the first interface portion 111.

[0106] To avoid possible refrigerant in the closed first cavity 101a from causing adverse phenomena such as flash explosion, in one implementation, a balance channel 22 is provided on the valve core ball 20. The balance channel 22 communicates the first cavity 101a and the L-shaped flow channel 21. In the open valve state, it can balance the pressure between the valve core ball 20 and the first cavity 101a and prevent liquid accumulation; in another implementation, a balance channel communicating the first cavity 101a and the second cavity 102a can be provided on the second gasket 142, which can also balance the pressure of the first cavity 101a.

[0107] According to the needs of the application scenario, the ball valve can also be provided with a charging valve 80 for evacuating or adding refrigerant.

[0108] In one implementation, the charging valve 80 is installed on the second connecting pipe 72. As shown in the figure, the charging valve 80 includes a charging valve body 81, a valve core 82 provided in the charging valve body 81, and a charging valve cap 83. The charging valve cap 83 and the charging valve body 81 can be fixedly connected by thread fitting to protect the valve core 82, and a sealing member can be provided between the charging valve cap 83 and the charging valve body 81 to ensure the sealing performance.

[0109] In other implementations, the charging valve 80 can also be installed on the first connecting pipe 71.

[0110] In this embodiment, various components of the valve body component 10, the valve core ball 20, the valve stem 31, the first connecting pipe 71, the second connecting pipe 72, etc. can all be made of steel (such as stainless steel) to reduce the manufacturing cost. At the same time, it can also meet the requirement of lead-free.

[0111] In practical applications, according to the needs of the application scenario, a copper pipe joint can also be fixedly connected outside the first connecting pipe 71 and / or the second connecting pipe 72 to facilitate welding and fixing with the copper pipe in the system.

[0112] This application also provides a manufacturing method of a ball valve, and the ball valve is the ball valve introduced in the foregoing embodiments.

[0113] In this embodiment, the manufacturing method of the ball valve includes:

[0114] The valve tube 11, valve seat 12 and valve end cover 13 are respectively processed and prepared using stainless steel sheets or stainless steel tubes; among them, the valve tube 11 is a tubular part with openings at both ends; the valve seat 12 includes a first stepped portion 121 and a second interface portion 122, and the valve end cover 13 includes a second stepped portion 131; the valve seat 12 is welded and fixed to one open end of the valve tube 11, and the stepped surface of the first stepped portion 121 of the valve seat 12 faces the lumen of the valve tube 11, and the second interface portion 122 communicates with the lumen of the valve tube 11; the valve end cover 13 is welded and fixed to the other open end of the valve tube 11 to seal the other open end of the valve tube 11.

[0115] In this manufacturing method, the valve tube 11, valve seat 12 and valve end cover 13 of the valve body component 10 are all processed and prepared using stainless steel sheets or stainless steel tubes, with low manufacturing costs and convenient assembly, which is beneficial to improving the assembly efficiency.

[0116] In specific implementation, the valve tube 11, valve seat 12 and valve end cover 13 can be formed by stamping or stretching.

[0117] In specific implementation, while assembling the valve body component 10, the valve core ball 20 is also assembled with the valve body component 10. This manufacturing method further includes:

[0118] Preparing the valve core ball 20, the first sealing gasket 141 and the second sealing gasket 142; among them, the valve core ball 20 has an L-shaped flow channel 21, and the L-shaped flow channel 21 includes a first flow channel segment 211 and a second flow channel segment 212. The axis of the first flow channel segment 211 is perpendicular to the axis of the second flow channel segment 212, and the connection between the first flow channel segment 211 and the second flow channel segment 212 is in arc transition;

[0119] Before welding the valve seat 12 to the valve tube 11, the first sealing gasket 141 is placed on the stepped surface of the first stepped portion 121, and the valve core ball 20 is inserted into the valve tube 11, so that the first flow channel segment 211 of the valve core ball 20 is aligned with the first interface portion 111 and abuts against the first sealing gasket 141;

[0120] Before welding the valve end cover 13 to the valve tube 11, the second sealing gasket 142 is placed on the stepped surface of the second stepped portion 131, and the valve end cover 13 is welded and fixed to the other open end of the valve tube 11, so that the second sealing gasket 142 abuts against the valve core ball 20.

[0121] To further improve the assembly efficiency, before welding and fixing the valve tube 11 and the valve seat 12, the relevant structures connected to the valve tube 11 or the valve seat 12 can be assembled first. After forming a modular assembly component, they are assembled together.

[0122] In specific implementation, before welding and fixing the valve seat 12 to the valve tube 11, the first assembly component 1A is assembled first, and the assembly of the first assembly component 1A includes the assembly of the first assembly part 11A.

[0123] As Figure 6 and Figure 7 shown, the first assembly 11A includes a valve pipe 11, a first connecting pipe 71, and a joint 40.

[0124] The assembly of the first assembly 11A includes:

[0125] Processing and preparing the joint 40 and the first connecting pipe 71 respectively using steel. When preparing the valve pipe 11, a flanging portion 112 is also provided on the pipe wall. The flanging portion 112 communicates with the lumen of the valve pipe 11, and the position of the flanging portion 112 is opposite to that of the first interface portion 111;

[0126] Welding and fixing the joint 40 to the flanging portion 112 of the valve pipe 11, and the inner hole of the joint 40 communicates with the lumen of the valve pipe 11; welding and fixing the first connecting pipe 71 to the first interface portion 111.

[0127] The assembly of the first assembly component 1A further includes the assembly of the aforementioned first assembly 11A and the stop ring 50. After the first assembly 11A and the stop ring 50 are assembled, the first assembly component 1A is obtained, as Figure 8 and Figure 9 shown.

[0128] In specific implementation, the stop ring 50 is processed and prepared using steel. Two convex portions 51 protruding radially inward are provided on the inner wall of the stop ring 50, and the two convex portions 51 are evenly arranged along the circumferential direction of the stop ring 50; when preparing the joint 40, an installation groove 42 for installing the stop ring 50 is processed at one end of the joint 40 away from the valve pipe 11.

[0129] After that, the stop ring 50 is welded and fixed on the aforementioned first assembly 11A. The stop ring 50 is located in the installation groove 42 and is specifically welded and fixed to the joint 40 to obtain the first assembly component 1A.

[0130] In specific implementation, before welding and fixing the valve seat 12 to the valve pipe 11, the second assembly component 2A is first assembled, as Figure 10 and Figure 11 shown. The second assembly component 2A includes a valve seat 12, a second connecting pipe 72, and a filling valve body 81.

[0131] The assembly of the second assembly component 2A includes:

[0132] Processing and preparing the second connecting pipe 72 using steel, preparing the filling valve body 81; opening an installation interface portion 721 on the pipe wall of the second connecting pipe 72; preparing the valve seat 12 as before;

[0133] Welding and fixing the second connecting pipe 72 to the second interface portion 122 of the valve seat 12, and welding and fixing the filling valve body 81 on the installation interface portion 721 of the second connecting pipe 72.

[0134] As needed, the second assembly component 2A may further include a pipe joint 73. The pipe joint 73 is a copper pipe joint 73. After the pipe joint 73 is processed and prepared using copper material, the pipe joint 73 is also welded and fixed to one end of the second connecting pipe 72 away from the valve seat 12.

[0135] As described above, after the first assembly component 1A and the second assembly component 2A are assembled, the second assembly component 2A and the first assembly component 1A are assembled together to form the third assembly component 3A. Specifically, the assembly of the first assembly component 1A and the second assembly component 2A is to weld and fix one open end of the valve pipe 11 of the first assembly component to the second interface portion 122 of the valve seat 12 of the second assembly component 2A. The third assembly component 3A can be referred to Figure 12 and Figure 13 for understanding.

[0136] After the third assembly component 3A is assembled, the valve core ball 20 and the valve end cover 13 are assembled, and the valve stem assembly 30 is also assembled together with the valve core ball 20 and the joint 40 to obtain the fourth assembly component 4A, as Figure 14 and Figure 15 shown.

[0137] After the fourth assembly component 4A is obtained, the valve cap assembly 60 can be assembled on the joint 40, and the relevant structures of the filling valve 80 can be assembled in the filling valve body 81.

[0138] It should be noted that in the above manufacturing method of the ball valve, the ball valve is equipped with a filling valve 80. The ball valve can also be not equipped with the filling valve 80. At this time, the manufacturing of the ball valve is similar to the above method, and the assembly of the relevant filling valve 80 can be cancelled, which will not be elaborated here.

[0139] In this article, specific examples are used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A ball valve, characterized in that, It includes a valve body component, a valve core ball and a valve stem; The valve body component has a valve cavity, a first interface portion and a second interface portion, and the center line of the first interface portion is perpendicular to the center line of the second interface portion; The valve core ball is rotatably arranged in the valve cavity. The valve core ball has an L-shaped flow channel, and the L-shaped flow channel includes a first flow channel segment and a second flow channel segment. The axis of the first flow channel segment is perpendicular to the axis of the second flow channel segment, and the connection between the first flow channel segment and the second flow channel segment is in arc transition; The valve stem can drive the valve core ball to rotate to conduct or cut off the passage between the first interface portion and the second interface portion.

2. The ball valve according to claim 1, characterized in that, The valve body component includes a valve pipe, a valve seat and a valve end cover; The valve pipe is a tubular structure with both ends open, and the first interface portion is arranged on the pipe wall of the valve pipe; One end of the valve seat is fixedly connected to an open end of the valve pipe, and the other end of the valve seat forms the second interface portion; The valve end cover seals the other open end of the valve pipe; The valve seat has a first step portion with a step surface facing the valve end cover, and the valve end cover has a second step portion with a step surface facing the valve end cover. A first gasket is arranged on the first step portion, and a second gasket is arranged on the second step portion. The first gasket and the second gasket are used to support the valve core ball.

3. The ball valve according to claim 2, wherein, A first cavity is formed between the valve end cover, the second gasket and the valve core ball. The valve core ball is provided with a balance channel, and the balance channel communicates with the closed cavity and the L-shaped flow channel.

4. The ball valve according to claim 2, wherein, A first cavity is formed between the second valve cavity, the second gasket and the valve core ball, and a second cavity is formed between the first gasket, the second gasket, the valve core ball and the valve pipe; The second gasket is provided with a balance channel, and the balance channel communicates with the first cavity and the second cavity.

5. The ball valve according to any one of claims 1-4, characterized in that, The ball valve further includes a first connecting pipe, a second connecting pipe and a filling valve; the first connecting pipe is fixedly connected to the first interface portion, and the second connecting pipe is fixedly connected to the second interface portion; the second connecting pipe is arranged horizontally, and the filling valve is installed on the second connecting pipe.

6. The ball valve according to any one of claims 1-4, characterized in that, The valve body component, the valve core ball and the valve stem are all made of stainless steel.

7. A manufacturing method of a ball valve, characterized in that, Including: Processing and preparing the valve pipe, the valve seat and the valve end cover respectively using stainless steel plates or stainless steel pipes; wherein, the valve pipe is a tubular part with both ends open, and a first interface portion communicating with the pipe cavity is arranged on the pipe wall of the valve pipe; the valve seat includes a first step portion and a second interface portion; the valve end cover includes a second step portion; Welding and fixing the valve seat at an open end of the valve pipe, making the step surface of the first step portion face the pipe cavity of the valve pipe, and the second interface portion communicate with the pipe cavity of the valve pipe; welding and fixing the valve end cover at the other open end of the valve pipe, making the valve end cover seal the other opening of the valve pipe.

8. The manufacturing method of the ball valve according to claim 7, characterized in that, Before welding and fixing the valve seat and the valve pipe, first assemble the first assembly component; The assembly of the first assembly component includes: Processing and preparing a joint and a first connecting pipe respectively using steel. A flanging portion is also arranged on the pipe wall of the valve pipe. The flanging portion and the first interface portion are opposite in position, and the flanging portion communicates with the pipe cavity of the valve pipe; Weld and fix the joint on the flanging part, with the inner hole of the joint communicating with the lumen of the valve pipe, and weld and fix the first connecting pipe on the first interface part.

9. The manufacturing method of the ball valve according to claim 8, characterized in that, The assembly of the first assembly component further includes: Manufacture a stop ring using steel. The inner wall of the stop ring is provided with two convex parts protruding radially inward, and the two convex parts are evenly arranged along the circumference of the stop ring; an installation groove is also provided at one end of the joint away from the valve pipe. Weld and fix the stop ring on the joint, and the stop ring is located in the installation groove.

10. The manufacturing method of the ball valve according to any one of claims 7-9, characterized in that, Before welding and fixing the valve seat and the valve pipe, assemble the second assembly component first. The assembly of the second assembly component includes: Manufacture a second connecting pipe using steel and prepare a filling valve body; an installation interface part is opened on the pipe wall of the second connecting pipe. Weld and fix the second connecting pipe to the second interface part of the valve seat, and weld and fix the filling valve body on the installation interface part.

11. The manufacturing method of the ball valve according to any one of claims 7-9, characterized in that, The manufacturing method further includes: Prepare a valve core ball, a first sealing gasket and a second sealing gasket; the valve core ball has an L-shaped flow channel, the L-shaped flow channel includes a first flow channel section and a second flow channel section, the axis of the first flow channel section is perpendicular to the axis of the second flow channel section, and the connection between the first flow channel section and the second flow channel section is in arc transition. Before welding the valve seat and the valve pipe, place the first sealing gasket on the step surface of the first step part, and insert the valve core ball into the valve pipe, so that the first flow channel section of the valve core ball aligns with the first interface part and abuts against the first sealing gasket. Before welding the valve end cover and the valve pipe, place the second sealing gasket on the step surface of the second step part, and weld and fix the valve end cover on the other open end of the valve pipe, so that the second sealing gasket abuts against the valve core ball.

12. The manufacturing method of the ball valve according to claim 11, characterized in that, When inserting the valve core ball into the valve pipe, also assemble the valve rod assembly and the valve core ball together; the valve rod assembly includes a valve rod and a sealing ring sleeved outside the valve rod.

13. The manufacturing method of the ball valve according to any one of claims 7-9, characterized in that, The valve pipe, the valve seat and the valve end cover are formed by stamping or stretching.

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