Control valve

Abstract

The utility model discloses a control valve which comprises a valve body and a plugging piece, at least part of the plugging piece is located in the valve body, the valve body comprises a fluid channel, the valve body comprises an annular groove surrounding the fluid channel, and the annular groove is sunken towards the fluid channel side from the first surface of the valve body; the valve body comprises a limiting hole part, at least part of the inner wall of the limiting hole part serves as the fluid channel, the limiting hole part comprises a limiting part and an extending part, the extending part is closer to the first surface than the limiting part, the extending part comprises a stopping part, and the stopping part is arranged in the axial direction of the fluid channel. And the stopping part is propped against the plugging piece. According to the control valve, the extending part is arranged, the extending part comprises the stopping part, the stopping part abuts against the plugging piece to fix the plugging piece, and therefore the sealing reliability of the plugging piece is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of valve for refrigeration system, specifically, relate to a control valve. BACKGROUND

[0002] Figure 1 The section view schematic drawing of the process hole plugging position of a control valve given in the background technology, the control valve includes valve body 1' and plugging piece 2', the valve body 1' includes hole 11', plugging piece 2' is pressed into hole 11' with interference, and sealing pair is formed by extrusion of hole wall to plugging piece 2' to realize sealing. The control valve with the above structure is used in the process, if the pressure bearing requirement of control valve is higher, plugging piece 2' is displaced under high pressure impact, which can cause the sealing pair to be damaged and appear external leakage, affecting the working reliability of control valve. SUMMARY

[0003] The utility model provides a control valve, including valve body and plugging piece, the plugging piece is located at least partially in the valve body, the valve body includes fluid passage, the valve body includes annular groove that is arranged around the fluid passage, the annular groove is recessed from the first surface of the valve body towards the fluid passage side, the valve body includes the limit hole portion, the inner wall of the limit hole portion is at least partially as the fluid passage, the limit hole portion includes limit portion and extension, the extension is closer to the first surface compared with the limit portion, the extension includes stop portion, in the axial direction of the fluid passage, the stop portion is abutted with the plugging piece.

[0004] The control valve given in the application, by setting extension, the extension includes stop portion, the fixation of plugging piece is realized by the abutment of stop portion to plugging piece, so as to improve the sealing reliability of plugging piece. BRIEF DESCRIPTION OF DRAWINGS

[0005] Figure 1 The section view schematic drawing of the process hole plugging position of a control valve given in the background technology;

[0006] Figure 2 The section view schematic drawing of the valve body and plugging piece cooperation of the control valve of the utility model;

[0007] Figure 3 : Figure 2 The cooperation schematic drawing of valve body and plugging piece before the riveting of extension;

[0008] Figure 4 : Figure 2 The section view schematic drawing of valve body and plugging piece in the separation state before the riveting of extension;

[0009] Figure 5 The section view schematic drawing of the control valve of the utility model;

[0010] Figure 6 : Figure 5 schematic view of the middle A. DETAILED DESCRIPTION

[0011] In order to make the technical personnel of the prior art better understand the technical scheme of the utility model, the utility model is further explained in detail below in combination with the drawings and specific embodiments. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained from these drawings without creating labor. The up and down orientation words involved in this paper are defined between the positions of the parts shown in the middle, only for expressing the clarity and convenience of the technical scheme, and it should be understood that the orientation words used in this paper should not limit the scope of the application claimed. Figure 2

[0012] Figure 1 A cross-sectional view of the process hole plugging part of a control valve is given as background art; Figure 2 A cross-sectional view of the cooperation of the valve body and the plugging piece of the control valve of the utility model is given; Figure 3 A cooperation schematic view of the valve body and the plugging piece before the extension part is not riveted in the middle is given; Figure 2 A cooperation schematic view of the valve body and the plugging piece before the extension part is not riveted in the middle is given; Figure 4 A cross-sectional schematic view of the valve body and the plugging piece in the separated state before the extension part is not riveted in the middle is given. Figure 2 As shown in the figure, the control valve of the embodiment includes a valve body 1 and a plugging piece 2, the plugging piece 2 is at least partially located in the valve body 1, the valve body 1 includes a fluid passage 11, the valve body 1 includes an annular groove 13 arranged around the fluid passage 11, the annular groove 13 is recessed from the first surface 101 of the valve body 1 towards the fluid passage 11 side;The valve body 1 includes a limiting hole part, the inner wall of the limiting hole part is at least partially used as the fluid passage 11, the limiting hole part includes a limiting part 12 and an extension part 14, the extension part 14 is closer to the first surface 101 than the limiting part 12, the extension part 14 includes a stop part 141, in the axial direction of the fluid passage 11, the plugging piece 2 is seated in the limiting part 12, and the stop part 141 abuts against the plugging piece 2. Therefore, by arranging the annular groove 13 around the fluid passage 11, the extension part 14 is closer to the first surface 101 of the valve body 1 than the limiting part 12, the plugging piece 2 is seated in the limiting part 12, and the extension part 14 is riveted to the plugging piece 2 through the stop part 141, realizing the fixation of the plugging piece 2, thereby improving the sealing reliability of the plugging piece 2 and guaranteeing the sealing property of the valve body 1.

[0013] In the embodiment, the plugging piece 2 is a spherical plugging piece, and the material thereof is preferably steel.

[0014] In this embodiment, as shown in the figure,

[0015] Figure 3-4 ​​As shown, the annular groove 13 is arranged around the limiting hole part, and the extension part 14 is formed by cutting the annular groove 13 and the limiting hole part. The limiting hole part is machined first, and then the annular groove 13 is machined, thereby improving the machining efficiency of the extension part 14 before riveting.

[0016] It should be noted that the annular groove 13 includes an inner annular wall 131, which serves as a riveting surface when the extension part 14 is riveted, so that the extension part 14 can be riveted to the blocking piece 2. Before the extension part 14 is riveted, the inner annular wall 131 of the annular groove 13 is an inclined surface. The end of the inner annular wall 131 on the slot side of the annular groove 13 is a first end, and the end of the inner annular wall 131 on the slot bottom 133 side is a second end. In the radial direction of the fluid passage 11, the first end is closer to the center of the fluid passage 11 than the second end. The inner annular wall 131 can improve the machining convenience of the riveting tool during riveting.

[0017] In this embodiment, after the extension part 14 is riveted, as shown, Figure 2 The annular groove 13 is generally V-shaped in the longitudinal cross section of the fluid passage 11, and the slot bottom 133 of the annular groove 13 is a flat surface or an arc surface. Specifically, the annular groove 13 includes the inner annular wall 131, the outer annular wall 132, and the slot bottom 133. The slot bottom 133 connects the inner annular wall 131 and the outer annular wall 132. The width of the slot opening of the annular groove 13 is greater than the width of the slot bottom 133.

[0018] Before the extension part 14 is riveted, as shown, Figure 3-4 As with the annular groove 13 after riveting, the annular groove 13 is also generally V-shaped in the axial cross section of the fluid passage 11. The width of the slot opening of the annular groove 13 is greater than the width of the slot bottom 133. The V-shaped cross-section of the annular groove 13 has the following beneficial effects compared to other shapes of grooves:

[0019] On the one hand, the V-shaped cross-section of the groove allows the tool to more easily avoid other parts of the valve body 1 during machining, reducing the difficulty of machining and making the machining process of the valve body 1 more flexible. The extension part 14 is easy to position when riveted by the riveting tool.

[0020] On the other hand, the V-shaped cross-section of the groove can effectively reduce the cutting cost during cutting.

[0021] As shown, Figure 3 In the axial direction of the fluid passage 11, the slot depth H1 of the annular groove 13 is defined, and the distance H2 between the center of the sphere of the blocking piece 2 and the first surface 101 is defined. Then H1 < H2 is satisfied. This ensures that the extension part 14 has sufficient length before riveting, so that the stop portion 141 of the extension part 14 can effectively limit the displacement of the blocking piece 2 after riveting, thereby ensuring the sealing reliability of the blocking piece 2.

[0022] At the same time, the radius of the plugging member 2 is defined as R, and 1 / 3R

[0023] In this embodiment, the limiting portion 12 includes a straight wall portion 123, one end of the straight wall portion 123 is connected with the stop portion 141, the other end of the straight wall portion 123 is connected with the first sealing portion 121, and the straight wall portion 123 has a second sealing portion 1231 which is tightly fitted with the plugging member 2, that is, the plugging member 2 is connected with the straight wall portion 123 in an interference fit. In this way, the inner wall of the straight wall portion 123 is extruded with the plugging member 2 to form a sealing pair to achieve sealing.

[0024] In this embodiment, the fluid passage 11 includes a straight hole portion 111, the limiting portion 12 includes the straight wall portion 123 and the first sealing portion 121, the inner diameter of the straight hole portion 111 is smaller than the inner diameter of the straight wall portion 123, the first sealing portion 121 connects the straight hole portion 111 and the straight wall portion 123, and the other side end of the plugging member 2 abuts against the first sealing portion 121 in the axial direction of the fluid passage 11. In combination with the second sealing portion 1231 and the stop portion 141, the sealing reliability of the plugging member 2 can be further improved.

[0025] It should be further noted that the control valve (for example, a valve for a refrigerant system) of the present embodiment has high pressure bearing requirements, and the plugging member 2 is not only prone to displacement under the continuous impact of high-pressure fluid inside the control valve, but more seriously, the plugging member 2 may be blown away due to being unable to withstand high pressure, resulting in a large amount of refrigerant leakage. In this embodiment, after the entire plugging member 2 is pressed into the limiting portion 12 in an interference fit, the sealing reliability of the plugging member 2 can be improved by the stop portion 141, so that the sealing performance of the valve body 1 is better.

[0026] In this embodiment, as shown in Figure 4 The limiting portion 12 includes a stepped portion 122, and the stepped surface 1221 of the stepped portion 122 is a bevel surface, which serves as the first sealing portion 12. By machining the stepped surface 1221 into a bevel surface, the plugging member 2 can better disperse pressure during the pressing process, thereby increasing the abutting pressure between the sealing pairs described below and improving the sealing effect. At the same time, the sealing pair formed by the tangential contact between the stepped surface 1221 and the plugging member 2 can form a sealing ring on the abutting surface, which can effectively prevent fluid leakage and thus improve the sealing performance.

[0027] As shown in Figure 4As shown, the included angle on the longitudinal section of the step surface 1221 is defined as θ, and the included angle θ satisfies 45° < θ < 75°. Based on this, the sealing pair tangent to the step surface 1221 of the sealing component 2 can effectively disperse stress, avoid material fatigue or damage caused by excessive stress, and further improve sealing performance.

[0028] like Figure 2 As shown, in the radial projection direction of the fluid channel 11, the outer contour of the projection surface of the extension 14 is located within the outer contour of the projection surface of the valve body 1, that is, the second surface 140 does not protrude from the first surface 101; the outer contour of the projection surface of the sealing member 2 is located within the outer contour of the projection surface of the valve body 1. The sealing member 2 is completely located within the valve body 1, allowing the valve body 1 to provide more stable support for the sealing member 2 and reduce displacement caused by vibration or impact. Simultaneously, since the sealing member 2 is completely located within the valve body 1, the impact of external impacts and other factors on the sealing member 2 is reduced, ensuring sealing performance and thus reducing maintenance costs due to wear or damage.

[0029] In this embodiment, the control valve also includes an adhesive (not shown in the figure). At least a portion of the adhesive is located between the stop portion 141 and the sealing member 2, so that the sealing member 2 is further bonded and fixed by the adhesive after being riveted. In this embodiment, the adhesive is preferably glue. After the adhesive is applied and cured, on the one hand, the adhesive can fill the tiny gap between the sealing member 2 and the valve body 1, thereby enhancing the overall sealing performance and ensuring that fluid will not leak from the limiting portion 12; on the other hand, after the adhesive cures, it forms a strong adhesive layer, which can effectively prevent the sealing member 2 from shifting after being subjected to fluid pressure impact.

[0030] Among them, such as Figure 2 As shown, the extension 14 includes a second surface 140 on the side away from the fluid channel 11. The second surface 140 is connected to the inner annular wall 131. To ensure the flow performance of the adhesive, the second surface 140 is lower than the first surface 101 in the axial direction of the fluid channel 11, so that another portion of the adhesive covers the second surface 140. If the adhesive overflows, another portion of the adhesive is located in the annular groove 13. Of course, because the second surface 140 is in such a position... Figure 2 When viewed from below the first surface 101, the adhesive can fill the annular groove 13 through the second surface 140. By simultaneously filling the annular groove 13, the outer surface of the valve body 1 (the surface on the side of the first surface 101) can be made flat. The flat outer surface can reduce the influence of external factors on the sealing component 2 and ensure the sealing reliability of the sealing component 2.

[0031] Figure 5 This is a cross-sectional schematic diagram of a control valve according to the present invention; Figure 6 for Figure 5 A schematic diagram of point A in the middle.

[0032] As shown in the figure, the control valve of the present embodiment comprises a valve body component a, a pilot valve component 4, a piston component 5, the valve body component a comprises a valve seat 3 and the above-mentioned valve body 1, the valve body 1 is fixedly connected with the valve seat 3, and the valve body 1 is located above the valve seat 3 in the view angle as shown. Figure 5 The pilot valve component 4 comprises a sleeve 42 fixedly welded with the valve body 1, a core component, the core component is partially located inside the sleeve 42, the core component comprises a pilot valve core 41, a core iron 43, a head 44, a first spring 45, a thimble 46, the pilot valve core 41 is a steel ball, the core iron 43 is capable of sliding in the sleeve 42, the head 44 is fixedly connected with the sleeve 42, the core iron 43 has a hole part, a part of the thimble 46 is located in the hole part, the lower end of the thimble 46 is capable of abutting against the pilot valve core 41, one end of the first spring 45 abuts against the thimble 46, and the other end of the first spring 45 abuts against the head 44.

[0033] The valve body 1 comprises a pilot cavity 15, the valve seat 3 comprises an inlet end 301, the following pilot flow path a1 is communicated with the inlet end 301, the pilot cavity 15 comprises an upper pilot valve port part 151 and a lower pilot valve port part 152, the pilot valve core 41 is located in the pilot cavity 15, and the pilot valve core 41 is capable of abutting against the upper pilot valve port part 151 or the lower pilot valve port part 152.

[0034] The control valve comprises a main valve cavity a01, the piston component 5 is located in the main valve cavity a01, the piston component 5 comprises a first piston 51, a second piston 52, a connecting rod 53, the upper end of the connecting rod 53 is connected with the first piston 51, the lower end of the connecting rod 53 is connected with the second piston 52, the valve body 1 and the first piston 51 comprise a second spring 54, one end of the second spring 54 abuts against the valve body 1, and the other end of the second spring 54 abuts against the first piston 51, the valve seat 3 comprises an upper main valve port part 303 and a lower main valve port part 302, the second piston 52 is capable of abutting against the upper main valve port part 303 or the lower main valve port part 302, so as to realize the switching of the flow path.

[0035] The valve seat 3 comprises a valve sleeve 31, the valve sleeve 31 is threadedly connected with the inner wall of the valve seat 3, the first piston 51 is located below the valve sleeve 31, and the second piston 52 is located above the valve sleeve 31, the valve sleeve 31 comprises a through hole, the lower end of the valve sleeve 31 has the above-mentioned upper main valve port part 303, the connecting rod 53 passes through the through hole, so that the upper end of the connecting rod 53 is connected with the first piston 51, and the lower end of the connecting rod 53 is connected with the second piston 52.

[0036] The valve seat 3 further comprises a first outlet end 305 and a second outlet end 304, the first outlet end 305 is located below the lower main valve port part 302, and the second outlet end 304 is located between the first piston 51 and the upper main valve port part 303 of the valve sleeve 31.

[0037] In the embodiment, the valve body component a comprises a pilot flow path a1, the pilot flow path a1 comprises a first pilot hole a11 and a second pilot hole a12, the first pilot hole a11 and the second pilot hole a12 are communicated, the second pilot hole a12 serves as the fluid passage 11, the second pilot hole a12 can be communicated with the pilot cavity 15, the first pilot hole a11 is communicated with the inlet end 301, and the first pilot hole a11 has a connecting part a110 communicated with the fluid passage 11, and the connecting part a110 is closer to the pilot cavity 15 relative to the blocking part 2. Based on this, the control valve seals the valve body 1 through the blocking part 2 under the action of the fluid, ensures the sealing reliability of the pilot flow path a1, and guarantees the sealing performance of the control valve.

[0038] The pilot flow path a1 is distributed on the valve body 1 and the valve seat 3, and each hole section of the pilot flow path a1 is preferably a straight hole. The hole sections at different positions can be machined on the valve body 1 and the valve seat 3 respectively, the first hole section a111 is machined on the valve seat 3, and the second hole section a112 and the fluid passage 11 are machined on the valve body 1, so as to improve the machining convenience. Specifically, the first pilot hole a11 comprises the first hole section a111 and the second hole section a112, the first hole section a111 and the second hole section a112 are communicated with each other, the first hole section a111 is located on the valve seat 3, the first hole section a111 is communicated with the inlet end 301, the second hole section a112 is located on the valve body 1, and the second hole section a112 is communicated with the fluid passage 11; the fluid passage 11 comprises a third hole section 112, the third hole section 112 is connected with the straight hole section 111, and the third hole section 112 can be communicated with the pilot cavity 15.

[0039] When the control valve is in an unloaded and power-off state, the piston component 5 is abutted against the lower pilot port part 152 under the action of the second spring 54.

[0040] When the control valve is in a loaded but power-off state, the first spring 45 presses the ejector pin 46 through the spring force, the ejector pin 46 is abutted against the pilot spool 41, the pilot spool 41 is abutted against the lower pilot port part 152, the upper end of the pilot spool 41 is pressed by the spring force of the first spring 45, the lower end of the pilot spool 41 is pressed by the fluid pressure, the spring force is greater than the fluid pressure, the pilot spool 41 is sealed with the lower pilot port part 152, and the fluid passage 11 is not communicated with the pilot cavity 15. The high-pressure gas cannot enter the back pressure cavity between the valve body 1 and the first piston 51, the back pressure cavity is connected with the interface end 17 to form a low-pressure area, the lower end of the second piston 52 is high pressure, and under the action of the pressure difference, the piston component 5 moves upward to abut the second piston 52 against the upper main valve port part 303, at this time, the fluid flows from the inlet end 301 to the first outlet end 305.

[0041] When the control valve is loaded and energized, the electromagnetic force overcomes the spring force of the first spring 45, the core iron 43 is attracted to the cover 44, the compression force of the upper end of the pilot valve core 41 disappears, under the action of the pressure difference force, the pilot valve core 41 is pushed to the upper pilot valve port part 151, at this time the upper pilot valve port part 151 is closed, the lower pilot valve port part 152 is opened, the fluid passage 11 is communicated with the pilot cavity 15. The gas flow enters the back pressure cavity from the lower pilot valve port part 152, so that the back pressure cavity becomes a high pressure area, the lower end of the second piston 52 is low pressure, under the action of the pressure difference force, the piston part 5 is pushed to move downward, the upper main valve port part 303 is opened, the lower main valve port part 302 is closed, at this time, the fluid flows from the inlet end 301 to the second outlet end 304.

[0042] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure.

[0043] The above describes the principles and implementation modes of the present application by using specific examples. The above description of the embodiments is only for the purpose of helping to understand the method and the core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, some improvements and modifications also fall within the protection scope of the present application.

Claims

1. A control valve characterized by, The valve body (1) comprises a fluid passage (11), the valve body (1) comprises an annular groove (13) arranged around the fluid passage (11), the annular groove (13) is recessed from a first surface (101) of the valve body (1) towards the fluid passage (11); the valve body (1) comprises a limiting hole portion, an inner wall of the limiting hole portion is at least partially used as the fluid passage (11), the limiting hole portion comprises a limiting portion (12) and an extension portion (14), the extension portion (14) is closer to the first surface (101) than the limiting portion (12), the extension portion (14) comprises a stop portion (141), in the axial direction of the fluid passage (11), the stop portion (141) abuts against the obturator (2).

2. The control valve according to claim 1, characterized in that The obturator (2) is a spherical obturator, the annular groove (13) is arranged around the extension portion (14), in the axial direction of the fluid passage (11), the depth of the annular groove (13) is defined as H1, the distance between the center of the spherical obturator (2) and the first surface (101) is defined as H2, and H1 < H2 is satisfied.

3. The control valve according to claim 1, characterized in that, In the axial direction of the fluid passage (11), the depth of the annular groove (13) is defined as H1, the obturator (2) is a spherical obturator, and the radius of the obturator (2) is defined as R, and 1 / 3R < H1 < R is satisfied.

4. The control valve of claim 1, wherein The fluid passage (11) comprises a straight hole portion (111), the limiting portion (12) comprises a straight wall portion (123) and a first sealing portion (121), the inner diameter of the straight hole portion (111) is smaller than the inner diameter of the straight wall portion (123), the first sealing portion (121) connects the straight hole portion (111) and the straight wall portion (123), and in the axial direction of the fluid passage (11), the obturator (2) abuts against the first sealing portion (121).

5. The control valve according to claim 4, characterized in that The limiting portion (12) comprises a stepped portion (122), the stepped surface (1221) of the stepped portion (122) is an inclined surface, the stepped surface (1221) is used as the first sealing portion (121), the included angle on the longitudinal section of the stepped surface (1221) is defined as θ, and 45° < θ < 75° is satisfied.

6. Control valve according to claim 4 or 5, characterized in that The obturator (2) is a spherical obturator, one end of the straight wall portion (123) is connected with the stop portion (141), the other end of the straight wall portion (123) is connected with the first sealing portion (121), the straight wall portion (123) has a second sealing portion (1231), and the second sealing portion (1231) is tightly fitted with the obturator (2).

7. Control valve according to any of claims 1-5, characterized in that In the projection direction of the radial direction of the fluid passage (11), the outer contour of the projection surface of the extension portion (14) is located within the outer contour of the projection surface of the valve body (1), and the outer contour of the projection surface of the obturator (2) is located within the outer contour of the projection surface of the valve body (1).

8. Control valve according to any of claims 1-5, characterized in that The control valve further comprises an adhesive, at least a part of the adhesive is located between the stop portion (141) and the obturator (2), and the obturator (2) is adhesively fixed with the valve body (1).

9. The control valve of claim 8, wherein, The extension portion (14) comprises a second surface (140) away from the fluid passage (11), the annular groove (13) comprises an inner annular wall (131), the second surface (140) is connected with the inner annular wall (131), in the axial direction of the fluid passage (11), the second surface (140) is lower than the first surface (101), and another part of the adhesive covers the second surface (140), and still another part of the adhesive is located in the annular groove (13).

10. Control valve according to any of claims 1-5, characterized in that The control valve comprises a valve body component (a), the valve body component (a) comprises a valve seat (3) and the valve body (1), the valve body (1) is fixedly connected with the valve seat (3), the valve body component (a) comprises a pilot flow path (a1), the pilot flow path (a1) comprises a first pilot hole (a11) and a second pilot hole (a12), the first pilot hole (a11) and the second pilot hole (a12) are communicated, the second pilot hole (a12) serves as the fluid passage (11), the valve body (1) comprises a pilot cavity (15), the second pilot hole (a12) can be communicated with the pilot cavity (15), the valve seat (3) comprises an inlet end (301), the first pilot hole (a11) is communicated with the inlet end (301), the first pilot hole (a11) has a connecting portion (a110) communicated with the fluid passage (11), and the connecting portion (a110) is closer to the pilot cavity (15) relative to the obturator (2).

11. The control valve according to claim 10, characterized in that The first pilot hole (a11) comprises a first hole section (a111) and a second hole section (a112), the first hole section (a111) is communicated with the second hole section (a112), the first hole section (a111) is located in the valve seat (3), the first hole section (a111) is communicated with the inlet end (301), and the second hole section (a112) is located in the valve body (1) and is communicated with the fluid passage (11). The first pilot hole (a11) comprises a first hole section (a111) and a second hole section (a112), the first hole section (a111) is communicated with the second hole section (a112), the first hole section (a111) is located in the valve seat (3), the first hole section (a111) is communicated with the inlet end (301), and the second hole section (a112) is located in the valve body (1) and is communicated with the fluid passage (11).

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