Control valve

Abstract

The utility model discloses a control valve which comprises a valve seat, the valve seat comprises an outlet flow channel, a valve cavity and an inlet flow channel, the inlet flow channel and the outlet flow channel are communicated through the valve cavity, a preset included angle is formed between the outlet flow channel and the valve cavity, the outlet flow channel comprises a first hole section and a second hole section, and the first hole section and the second hole section are coaxially arranged. Part of the hole wall of the second hole section is connected with the inner wall of the valve cavity, the hole diameter of the second hole section is larger than that of the first hole section, and the first hole section is longer than the second hole section. According to the control valve, the included angle is formed between the outlet flow channel and the valve cavity, the outlet flow channel is divided into the first hole section and the second hole section, the hole diameter of the second hole section connected with the valve cavity is larger than that of the first hole section, pressure loss generated when fluid passes through the outlet flow channel is reduced, and the water flow performance of the control valve is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a control valve. Background Technology

[0002] Figure 1 The background image shows a cross-sectional view of the valve body of a control valve.

[0003] As shown in the figure, the valve seat 1 of the control valve includes a first flow channel 212, a second flow channel 11, and a third flow channel 211, wherein the third flow channel 211 is the outlet flow channel. The first flow channel 212 and the second flow channel 11 are arranged at an angle, and the first flow channel 212 is connected to the flow channel wall of the second flow channel 11. Due to the angle arrangement, there is a large throttling at the connection between the first flow channel 212 and the flow channel wall of the second flow channel 11, which affects the water flow performance within the flow channel, and there is room for improvement. Utility Model Content

[0004] This application provides a control valve, including a valve seat. The valve seat includes an outlet flow channel, a valve cavity, and an inlet flow channel. The inlet flow channel and the outlet flow channel are connected through the valve cavity. The outlet flow channel forms a preset angle with the valve cavity. The outlet flow channel includes a first orifice section and a second orifice section. The wall of the second orifice section is connected to the inner wall of the valve cavity. The diameter of the second orifice section is larger than the diameter of the first orifice section, and the length of the first orifice section is greater than the length of the second orifice section.

[0005] The control valve of this application has an outlet flow channel set at an angle to the valve cavity. The outlet flow channel is configured as a first orifice section and a second orifice section, and the orifice diameter of the second orifice section connected to the valve cavity is larger than that of the first orifice section. This reduces the pressure loss of the fluid when passing through the outlet flow channel and improves the water flow performance of the control valve. Attached Figure Description

[0006] Figure 1 This is a schematic cross-sectional view of the valve body of a control valve in the background art;

[0007] Figure 2 A cross-sectional schematic diagram of a control valve provided by this utility model;

[0008] Figure 3 for Figure 2 Cross-sectional schematic diagram of the middle valve seat;

[0009] Figure 4 for Figure 3 A partial schematic diagram of point I in the middle;

[0010] Figure 5 for Figure 3 A partial cross-sectional view along the AA direction.

[0011] Explanation of symbols in the diagram:

[0012] 100. Valve seat; 10. Outlet flow channel; 110. First orifice section; 120. Second orifice section;

[0013] 1210, Full-circle hole section; 1220, Non-full-circle hole section; 130, Transition hole section;

[0014] 200. Valve stem assembly; 20. Inlet flow channel; 201. Limiting part;

[0015] 210. Valve core;

[0016] 30. Valve cavity; 300. Valve cover assembly; 301. Stop part;

[0017] 40. Valve port section; 410. Valve port flow channel; 430. Main valve port section; 440. Drainage section; Detailed Implementation

[0018] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0019] It should be noted that the directional terms such as "up" and "down" used in this article are based on... Figure 2 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.

[0020] like Figure 2-4As shown, a control valve includes a valve seat 100, which includes an outlet flow channel 10, a valve cavity 30, and an inlet flow channel 20. The inlet flow channel 20 and the outlet flow channel 10 are connected through the valve cavity 30. The outlet flow channel 10 and the valve cavity 30 form a preset angle. It should be noted that the central axis of the inlet flow channel 20 and the central axis of the outlet flow channel 10 are approximately coincident. The acute angle between the central axis of the outlet flow channel 10 and the central axis of the valve cavity 30 is not less than 25 degrees and not more than 50 degrees. With this configuration, both the inlet flow channel 20 and the outlet flow channel 10 are inclined relative to the valve cavity 30. The outlet flow channel 10 includes a first orifice section 110 and a second orifice section 120. The first orifice section 110 and the second orifice section 120 are coaxially arranged, specifically, the central axis of the first orifice section 110 coincides with the central axis of the second orifice section 120. This arrangement allows the same tooling fixture to be used for machining the first orifice section 110 and the second orifice section 120, eliminating the need to change fixtures and improving machining efficiency. Part of the orifice wall of the second orifice section 120 is connected to the cavity wall of the valve chamber 30, meaning that the second orifice section 120 is closer to the valve chamber 30 than the first orifice section 110. The diameter of the second orifice section 120 is larger than that of the first orifice section 110. This increases the flow area at the junction of the second orifice section 120 and the valve chamber 30, reducing pressure loss at this junction and improving the water flow performance of the control valve. Simultaneously, the length of the first orifice section 110 is greater than the length of the second orifice section 120. From a machining convenience perspective, the second hole section 120 is more difficult to machine than the first hole section 110. Firstly, it requires drilling a larger hole into a smaller one, necessitating tool changes. Secondly, when machining the second hole section 120, some inner walls are incomplete, with gaps at the intersection with the valve cavity 30. This places higher demands on the machining fixtures and tools, and the gaps cause more severe tool wear. Because machining intersecting holes is typically called chip-breaking machining, the intermittent cutting action of the tool leads to periodic changes in cutting force, easily generating irregular short chips or fragments, which easily cause tool wear. Therefore, minimizing the length of the second hole section 120 improves machining convenience, reduces machining difficulty, and lowers machining costs.

[0021] like Figure 2-3 As shown, a transition section 130 is included between the first orifice section 110 and the second orifice section 120. One end of the transition section 130 is connected to the first orifice section 110, and the other end of the transition section 130 is connected to the second orifice section 120. The diameter of the transition section 130 gradually decreases along the direction of fluid outflow. On the one hand, the transition section 130 improves the convenience of processing; on the other hand, the transition section 130 makes the flow of fluid through the outlet channel 10 smoother, thus playing a guiding role.

[0022] like Figure 3As shown, the second hole segment 120 includes a full circular hole segment 1210 and a non-full circular hole segment 1220. The inner wall of the non-full circular hole segment 1220 is connected to the cavity wall of the valve cavity 30. It should be noted that the term "full circular hole segment 1210" means that the plane perpendicular to the central axis of the second hole segment 120 is defined as the projection plane, and the hole wall of the full circular hole segment 1210 is a complete circle. The term "non-full circular hole segment 1220" means that the plane perpendicular to the central axis of the second hole segment 120 is defined as the projection plane, and the hole wall of the non-full circular hole segment 1220 is an arc segment. Specifically, as shown... Figure 3 As shown, the portion of the inner wall of the second orifice section 120 that connects to the cavity wall of the valve chamber 30 is the non-circular orifice section 1220. One end of the circular orifice section 1210 is connected to the transition orifice section 130, and the other end of the circular orifice section 1210 is connected to the non-circular orifice section 1220. With this configuration, after passing through the valve chamber 30, the fluid flows from the non-circular orifice section 1220 to the circular orifice section 1210, and then flows through the transition orifice section 130 to the first orifice section 110.

[0023] Furthermore, defining the diameter of the full-circle section 1210 as D1 and the diameter of the first section 110 as D2, then satisfying D2 < D1 ≤ 20%D2, this setting can effectively improve the water flow performance of the control valve. Through actual verification, when D1 equals 20%D2, the water flow increases by 12.2%. Specifically, the valve seat 100 is made of steel base material and is a forging. The valve seat blank is forged from steel base material and then internally machined. Therefore, under the premise of parts standardization and control valve lightweighting, the diameter D1 of the full-circle section 1210 is not necessarily better the larger it is. Considering the processability and material cost, satisfying the range of D2 < D1 ≤ 20%D2 can meet the design requirements.

[0024] Furthermore, the inner length of the full-circle section 1210 is defined as L3, and the inner length of the non-full-circle section 1220 is defined as L4, satisfying that L4 is greater than L3. This setting, where the inner length of the non-full-circle section 1220 is greater than that of the full-circle section 1210, effectively increases the flow area, especially at the connection between the second section 120 and the valve cavity 30, reducing pressure loss of the fluid passing through the outlet flow channel 10 and improving the water flow performance of the control valve. The inner length L3 of the full-circle section 1210 is greater than or equal to 2mm. This setting, by machining a complete inner-circle section first and then machining the non-full-circle section, improves tool clamping stability during machining and reduces machining difficulty.

[0025] like Figure 4As shown, the valve seat 100 also includes a valve port portion 40, which includes a valve port flow channel 410. The flow channel wall of the valve port flow channel 410 includes a guide section 440 and a main valve port section 430. One end of the guide section 440 is connected to the main valve port section 430, and the other end of the guide section 440 is connected to the flow channel wall of the inlet flow channel 20. Since the valve cavity 30 is set at an angle relative to the inlet flow channel 20 and the outlet flow channel 10, the fluid is obstructed when it flows in from the inlet flow channel 20 through the valve port portion 40. The guide section 440 is set as an arc segment, which can buffer and guide the fluid, reduce fluid resistance, improve water flow performance, and also reduce fluid noise.

[0026] like Figure 2 As shown, the control valve of this application also includes a valve stem component 200 and a valve cover component 300. The valve stem component 200 includes a valve core 210, which is connected to the valve stem component 200 in a limiting manner. It should be noted that after the valve core 210 and the valve stem component 200 are assembled, the valve core 210 only needs to ensure that it will not fall off. The specific connection method can be a threaded connection, a slot connection, or a pin connection, or it can be fixed welding. The valve core 210 is located in the valve cavity 30. The valve stem component 200 can drive the valve core 210 to move towards or away from the valve port 40 in the valve cavity 30 to open or close the valve port 40. Specifically, the valve stem component 200 includes a threaded portion that is threaded to the valve cover component 300, and drives the valve core 210 to open or close the valve port 40 through threaded transmission. The valve cover component 300 restricts the movement direction of the valve stem component 200. Specifically, the valve cover component 300 includes a stop portion 301, and the valve stem component 200 includes a limiting portion 201. The valve stem component 200 uses a threaded drive to make the limiting portion 201 contact the stop portion 301 of the valve cover component 300, thereby limiting the movement distance of the valve stem component 200.

[0027] The above is merely a description of specific embodiments of this utility model. It should be noted that those skilled in the art can make several improvements without departing from the principle of this utility model, and these improvements should also be considered within the protection scope of this utility model.

Claims

1. A control valve, characterized in that, The application relates to a valve seat (100) comprising an outlet flow channel (10), a valve cavity (30), and an inlet flow channel (20) which communicates with the outlet flow channel (10) through the valve cavity (30), wherein the outlet flow channel (10) is at a preset angle with the valve cavity (30), the outlet flow channel (10) comprises a first hole section (110) and a second hole section (120), a part of the hole wall of the second hole section (120) is connected with the inner wall of the valve cavity (30), the hole diameter of the second hole section (120) is larger than that of the first hole section (110), and the length of the first hole section (110) is larger than that of the second hole section (120). The first hole section (110) and the second hole section (120) are coaxially arranged, and a transition hole section (130) is arranged between the first hole section (110) and the second hole section (120), one side end of the transition hole section (130) is connected with the first hole section (110), the other side end of the transition hole section (130) is connected with the second hole section (120), and the hole diameter of the transition hole section (130) gradually decreases along the direction of fluid outflow.

2. The control valve of claim 1, wherein The second hole section (120) comprises a whole-circle hole section (1210) and a non-whole-circle hole section (1220), the inner wall of the non-whole-circle hole section (1220) is connected with the inner wall of the valve cavity (30), one side end of the whole-circle hole section (1210) is connected with the transition hole section (130), and the other side end of the whole-circle hole section (1210) is connected with the non-whole-circle hole section (1220).

3. The control valve of claim 2, wherein The hole diameter of the whole-circle hole section (1210) is defined as D1, the hole diameter of the first hole section (110) is defined as D2, and D2 < D1 <= 20% D2 is met.

4. The control valve of claim 3, wherein The inner hole length of the whole-circle hole section (1210) is defined as L3, the inner hole length of the non-whole-circle hole section (1220) is defined as L4, L4 is larger than L3, and the inner hole length of the whole-circle hole section (1210) is larger than or equal to 2 mm.

5. The control valve of claim 3, wherein The hole diameter of the whole-circle hole section (1210) is defined as D1, the hole diameter of the first hole section (110) is defined as D2, D2 < D1 <= 20% D2 is met, the inner hole length of the whole-circle hole section (1210) is defined as L3, the inner hole length of the non-whole-circle hole section (1220) is defined as L4, L4 is larger than L3, and the inner hole length of the whole-circle hole section (1210) is larger than or equal to 2 mm.

6. The control valve of claim 3, wherein The valve cavity (30) comprises a valve port part (40), the valve port part (40) comprises a valve port flow channel (410), the flow channel wall of the valve port flow channel (410) comprises a flow guiding section (440) and a main valve port section (430), the flow guiding section (440) is an arc section, one end of the flow guiding section (440) is connected with the main valve port section (430), and the other end of the flow guiding section (440) is connected with the inlet flow channel (20).

7. Control valve according to any of claims 1-6, characterized in that ​ 8. The control valve of claim 7, wherein The material of the valve seat (100) is a steel base material, the valve seat (100) is a forge piece, the valve seat (100) comprises a valve port portion (40), the valve port portion (40) comprises a valve port flow channel (410), the flow channel wall of the valve port flow channel (410) comprises a flow guiding section (440) and a main valve port section (430), the flow guiding section (440) is a circular arc section, one end of the flow guiding section (440) is connected to the main valve port section (430), and the other end of the flow guiding section (440) is connected to the inlet flow channel (20).

9. The control valve of claim 8, wherein Further comprising a valve stem component (200) and a valve cover component (300), the valve stem component (200) comprises a valve core (210), the valve core (210) is limitingly connected with the valve stem component (200), the valve core (210) is located in the valve cavity (30), the valve cavity (30) comprises a valve port portion (40), the valve stem component (200) drives the valve core (210) to move in the valve cavity (30) to the side close to or away from the valve port portion (40) to open or close the valve port portion (40), and the valve cover component (300) limits the moving direction of the valve stem component (200).

10. Control valve according to any of claims 1-6, characterized in that Further comprising a valve stem component (200) and a valve cover component (300), the valve stem component (200) comprises a valve core (210), the valve core (210) is limitingly connected with the valve stem component (200), the valve core (210) is located in the valve cavity (30), the valve cavity (30) comprises a valve port portion (40), the valve stem component (200) drives the valve core (210) to move in the valve cavity (30) to the side close to or away from the valve port portion (40) to open or close the valve port portion (40), and the valve cover component (300) limits the moving direction of the valve stem component (200).

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