An expansion valve

Abstract

This utility model discloses an expansion valve, including a valve body assembly and a valve needle. The valve body assembly includes a valve seat and a valve core. A first end of the valve core is disposed within the valve seat, and a valve hole is formed on the valve core. The valve needle is opposite to the valve hole and can move closer to or further away from the valve hole to adjust the opening degree of the expansion valve. A flow-damping orifice is formed on the valve core, coaxial with and communicating with the valve hole. The diameter of the flow-damping orifice is larger than the diameter of the valve hole. The valve body assembly also includes a noise-reducing baffle fixed within the flow-damping orifice and spaced apart from the valve hole. A noise-reducing channel is formed on the noise-reducing baffle, and liquid within the valve body assembly flows between the valve hole, the flow-damping orifice, and the noise-reducing channel. This utility model has a noise reduction and sound-absorbing effect.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an expansion valve that can reduce noise. Background Technology

[0002] The expansion valve is an important component in refrigeration and air conditioning systems, and its main function is to regulate the flow of refrigerant.

[0003] In existing expansion valves, the fluid directly enters or exits the throttling channel of the valve body. During cooling or heating, the fluid velocity in the expansion valve is too fast, which can easily generate turbulence and whistling noise during the flow process. This is especially true in the case of two-phase flow (gas and liquid mixing), where the uneven mixing of gas and liquid makes it easier to generate noise, which in turn affects the product quality of refrigeration equipment or air conditioners. Utility Model Content

[0004] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, this utility model provides an expansion valve with noise reduction and silencing effects.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an expansion valve, comprising a valve body assembly and a valve needle, wherein the valve body assembly comprises a valve seat and a valve core, the first end of the valve core is disposed in the valve seat, a valve hole is formed on the valve core, and the valve needle is opposite to the valve hole and can move closer to or further away from the valve hole to adjust the opening degree of the expansion valve.

[0006] The valve core has a flow-slowing hole formed on it. The flow-slowing hole is coaxial with the valve hole and communicates with it. The diameter of the flow-slowing hole is larger than the diameter of the valve hole.

[0007] The valve body assembly also includes a noise reduction baffle, which is fixed inside the slow flow hole and spaced apart from the valve hole. A noise reduction channel is formed on the noise reduction baffle, and the liquid in the valve body assembly flows between the valve hole, the slow flow hole and the noise reduction channel.

[0008] In this technical solution, a noise-reducing baffle and a flow-slowing orifice are designed. During use, when the liquid flows through the flow-slowing orifice and the noise-reducing baffle, the noise-reducing channel on the noise-reducing baffle is radially misaligned with the valve orifice, so the liquid flow will not pass through the noise-reducing channel and valve orifice in a straight line, thus increasing the flow path of the liquid. Moreover, the diameter of the flow-slowing orifice is larger than the diameter of the valve orifice, so the flow velocity of the liquid will be reduced when the liquid flows through the flow-slowing orifice and the noise-reducing baffle, and the mixing of the two phases at this point can be more uniform, thereby reducing the noise of the liquid flow.

[0009] Furthermore, the noise reduction baffle has multiple through holes circumferentially distributed around its axis. These through holes penetrate the noise reduction baffle and form a circumferentially closed structure. The multiple through holes together form a noise reduction channel.

[0010] Furthermore, the number of through holes is 2 to 10.

[0011] Furthermore, the thickness of the noise reduction baffle is between 0.5mm and 2mm.

[0012] Furthermore, the noise reduction baffle includes a baffle body and multiple protruding teeth. The multiple protruding teeth protrude from the outer side wall of the baffle body and are circumferentially spaced around the axis of the baffle body. The gaps between adjacent protruding teeth form noise reduction channels.

[0013] Furthermore, the axial cross-sectional shape of the protruding tooth is set to at least one of a rectangle, an arc, a triangle, and a trapezoid.

[0014] Furthermore, the noise reduction baffle is made of metal and is welded or riveted to the valve core.

[0015] Furthermore, a central hole is formed on the noise reduction baffle, the central hole penetrates the noise reduction baffle, the central hole is coaxial with the valve hole, and the diameter of the central hole is smaller than the diameter of the valve hole.

[0016] Furthermore, a first limiting platform is formed on the inner wall of the slow-flow hole, the end face of the noise reduction baffle is fitted with the first limiting platform, and the outer wall of the noise reduction baffle abuts against the inner wall of the slow-flow hole.

[0017] Furthermore, the valve core has a second limiting platform formed at its end, which is axially opposite to the first limiting platform. The noise reduction baffle is disposed between the first limiting platform and the second limiting platform, and the two end faces of the noise reduction baffle are respectively fitted to the first limiting platform and the second limiting platform.

[0018] Furthermore, the valve body assembly also includes a first connecting pipe and a second connecting pipe. The first connecting pipe is coaxially connected to the valve seat, and the second connecting pipe is connected to the side wall of the valve seat and communicates with the inner cavity of the valve seat. The valve core is disposed between the first connecting pipe and the second connecting pipe, and the second end of the valve core is disposed inside the first connecting pipe.

[0019] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but this is not intended to limit the technical solution of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a front sectional view of the expansion valve according to one embodiment of the present invention;

[0022] Figure 2 for Figure 1 Enlarged view of a section at point A (through holes and a central hole are formed on the noise reduction baffle);

[0023] Figure 3 This is a front sectional view of the expansion valve according to one embodiment of the present invention;

[0024] Figure 4 for Figure 3 Enlarged view of a section at point B (the noise reduction baffle has protruding teeth and a central hole);

[0025] Figure 5 This is a schematic diagram of the liquid flow path in one embodiment of the present invention (the noise reduction baffle has protruding teeth but no central hole);

[0026] Figure 6 This is a schematic diagram of the liquid flow path in one embodiment of the present invention (the noise reduction baffle has through holes but no central hole);

[0027] Figure 7 This is a structural diagram of a noise reduction baffle according to one embodiment of the present invention;

[0028] Figure 8 This is a structural diagram of a noise reduction baffle according to one embodiment of the present invention;

[0029] Figure 9 This is a structural diagram of a noise reduction baffle according to one embodiment of the present invention;

[0030] Figure 10 This is a structural diagram of a noise reduction baffle according to one embodiment of the present invention;

[0031] Figure 11 This is a structural diagram of a noise reduction baffle according to one embodiment of the present invention;

[0032] Figure 12This is a structural diagram of a noise reduction baffle according to one embodiment of the present invention;

[0033] Figure 13 This is a structural diagram of a noise reduction baffle according to one embodiment of the present invention;

[0034] Figure 14 This is a structural diagram of a noise reduction baffle according to one embodiment of the present invention.

[0035] in,

[0036] 10. Valve body assembly; 11. Valve seat; 12. Valve core; 121. Valve bore; 122. Flow-retarding orifice; 123. First limiting stage; 124. Second limiting stage;

[0037] 13. Noise-reducing baffle; 131. Baffle body; 132. Raised tooth; 133. Through hole; 134. Center hole;

[0038] 14. First connecting pipe; 15. Second connecting pipe;

[0039] 20. Valve needle;

[0040] 30. Rotor assembly; 31. Magnetic rotor; 32. Guide rail shaft; 33. Slip ring; 34. Stop rod;

[0041] 40. Outer shell. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0043] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this utility model. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0044] As one embodiment of this utility model, see the appendix. Figures 1 to 4 An expansion valve is disclosed, including a valve body assembly 10 and a valve needle 20. The valve body assembly 10 includes a valve seat 11 and a valve core 12. The first end of the valve core 12 is placed inside the valve seat 11, and a valve hole 121 is opened on it. The valve needle 20 is arranged opposite to the valve hole 121. The opening degree of the expansion valve is adjusted by moving closer to or further away from the valve hole 121.

[0045] A flow-retarding hole 122 is formed on the valve core 12. The flow-retarding hole 122 is coaxially arranged with the valve hole 121 and communicates with it. The diameter of the flow-retarding hole 122 is larger than that of the valve hole 121.

[0046] The valve body assembly 10 also includes a noise reduction baffle 13, which is fixedly installed in the slow flow hole 122 and maintains a certain distance from the valve hole 121. A noise reduction channel is formed on the noise reduction baffle 13, and the liquid in the valve body assembly 10 flows between the valve hole 121, the slow flow hole 122 and the noise reduction channel.

[0047] The expansion valve in this embodiment generally also includes a rotor assembly 30 and a housing 40. The rotor assembly 30 includes a magnetic rotor 31, a guide shaft 32, a slip ring 33, a stop rod 34, etc. The housing 40 is fixedly connected to the valve body. The rotor assembly 30 is disposed inside the housing 40. The guide shaft 32 and the valve needle 20 are connected by components such as springs and spring support seats. During use, the rotation of the magnetic rotor 31 drives the guide shaft 32 to rotate accordingly. The guide shaft 32 further drives the valve needle 20 to perform linear motion, thereby adjusting the opening degree of the expansion valve. The slip ring 33 is disposed on the guide shaft 32 through a spiral guide. The stop rod 34 is used to cooperate with the slip ring 33 to limit the start and stop positions of the linear motion of the guide shaft 32.

[0048] In this embodiment, the valve core 12 is generally welded and fixed in the valve body. The valve core 12 is provided with a valve hole 121 corresponding to the valve needle 20. The rotor assembly 30 drives the valve needle 20 to move linearly, so that the valve needle 20 approaches (inserts) or moves away from the valve hole 121.

[0049] In this embodiment, a flow-damping hole 122 is formed on the valve core 12. The flow-damping hole 122 is coaxial with and communicates with the valve hole 121. The diameter of the flow-damping hole 122 is larger than the diameter of the valve hole 121. The valve body assembly 10 also includes a noise-reducing baffle 13 disposed within the flow-damping hole 122. The noise-reducing baffle 13 is axially opposite to and spaced apart from the valve hole 121. The noise-reducing baffle 13 has a noise-reducing channel. Figure 2 , 4 As can be seen, the flow path of the liquid in the valve body is the noise reduction channel, the slow flow hole 122 and the valve hole 121. The noise reduction baffle 13 prevents the liquid from directly entering the valve hole 121 along the axial direction when it flows. Instead, it needs to flow through the noise reduction channel and the slow flow hole 122 first. This process changes the liquid flow path and suddenly enlarges the flow cross section, thereby slowing down the liquid flow speed and reducing noise.

[0050] Furthermore, the design of the flow-slowing hole 122 in this embodiment not only provides installation space for the noise reduction baffle 13, but also the structure that the diameter of the flow-slowing hole 122 is larger than the diameter of the valve hole 121 allows the liquid flow (two-phase flow) to be fully mixed and uniform here, thereby reducing the noise during flow.

[0051] In this embodiment, the noise reduction baffle 13 is fixed inside the flow slowing hole 122. In actual installation, the noise reduction baffle 13 and the valve core 12 can be fixedly connected by one or more of the following methods: welding, riveting, snap-fitting, plugging, and other connection methods.

[0052] In this embodiment, the noise reduction baffle 13 can be set as a metal sheet, generally made of the same material as the valve core 12, valve body, first connecting pipe 14, and second connecting pipe 15.

[0053] The noise reduction channels defined in this embodiment can be completely offset or partially overlapped in axial projection; no specific limitation is made in this regard.

[0054] In this embodiment, the specific structure of the noise reduction channel is not specifically limited. It can be designed in various forms such as notches, grooves or holes according to actual needs. Moreover, the specific position can be set at the edge of the noise reduction baffle 13 or at a position close to the inside. As long as the liquid flow can form a curved flow path and reduce the noise generated by the liquid flow when it flows between the noise reduction channel and the valve hole 121, it is acceptable.

[0055] As one embodiment of this utility model, see the appendix. Figure 2 , 13 14. The noise reduction baffle 13 has a plurality of through holes 133 circumferentially distributed around the axis of the noise reduction baffle. The through holes 133 penetrate the noise reduction baffle 13 and form a circumferentially closed structure. The plurality of through holes 133 together form the noise reduction channel.

[0056] In this embodiment, the through hole 133 is set on the inner side of the edge of the noise reduction baffle 13 to form a circumferentially closed hole structure. Multiple through holes 133 together form a noise reduction channel, that is, each through hole 133 can achieve the effect of changing the liquid flow path mentioned above.

[0057] In actual setup, multiple through holes 133 can be arranged to be evenly distributed around the central axis of the noise reduction baffle 13. This even distribution of through holes 133 can improve the uniformity of the liquid flow after passing through the noise reduction baffle 13, thereby improving the stability of the liquid flow and helping to reduce noise and pressure balance during the liquid flow process.

[0058] In this embodiment, the specific number of through holes 133 is not specifically limited. In actual design, the number of noise reduction channels in this embodiment can also be set to 1, 2, 3... or more, without specific limitation.

[0059] However, to ensure the balance of fluid pressure, the number of noise reduction channels is generally no less than two. In actual installation, the number of through holes 133 can be designed according to the diameter of the noise reduction baffle 13 (i.e., the flow-slowing hole 122 or the inner diameter of the valve body) and the diameter of the through holes 133. Generally, when the diameter of the noise reduction baffle 13 is large or the diameter of the through holes 133 is small, the number of through holes 133 can be increased accordingly. See Appendix. Figure 13 , 14 The structure consists of four through holes 133 on the noise reduction baffle 13.

[0060] As one embodiment of this utility model, see the appendix. Figure 4 , 7 8. The noise reduction baffle 13 includes a baffle body 131 and a plurality of protruding teeth 132. The plurality of protruding teeth 132 protrude from the outer side wall of the baffle body 131 and are circumferentially spaced around the axis of the baffle body 131. The gap between adjacent protruding teeth 132 forms the noise reduction channel.

[0061] In this embodiment, the outer side of the noise reduction baffle 13 is configured with a tooth 132 structure (similar to a gear structure), wherein the gap between adjacent teeth 132 forms a noise reduction channel. In this embodiment, the noise reduction channel is located at the outer edge of the noise reduction baffle 13, which causes a large radial displacement between the noise reduction channel and the valve hole 121, thereby improving the noise reduction environment and helping to reduce noise.

[0062] In this embodiment, the number of protruding teeth 132 is not specifically limited. In actual settings, the design can be optimized according to the diameter of the noise reduction baffle 13.

[0063] In this embodiment, the specific cross-sectional shape of the protruding tooth 132 is not specifically limited. In actual setting, the axial cross-sectional shape of the protruding tooth 132 is set to at least one of rectangle, arc, triangle and trapezoid.

[0064] As attached Figure 7 , 8 As shown, the convex tooth 132 has a rectangular structure; as attached Figure 9 , 10 As shown, the convex tooth 132 is constructed in a triangular or V-shape; as attached Figure 11 , 12 As shown, the convex tooth 132 has an arc-shaped structure.

[0065] In actual setup, the protrusion 132 can be set to a single cross-sectional shape or a combination of multiple different cross-sectional shapes. Of course, in actual setup, the structure of the protrusion 132 can also be set to other shapes, such as wavy, elliptical, and sawtooth shapes, etc. There are no specific limitations on this, as long as it is ensured that an effective noise reduction channel can be constructed between adjacent protrusions 132.

[0066] As one embodiment of this utility model, see the appendix. Figure 2 , 4 8, 10, 12, 14, A central hole 134 is formed on the noise reduction baffle 13. The central hole 134 penetrates the noise reduction baffle 13. The central hole 134 is coaxial with the valve hole 121. The diameter of the central hole 134 is smaller than the diameter of the valve hole 121.

[0067] In this embodiment, the noise-reducing baffle 13 has a central hole 134. The central hole 134 and the valve hole 121 are coaxial. The central hole 134 allows liquid flow to pass through the noise-reducing baffle 13. In actual use, without the central hole 134, no liquid flows directly through the central area of ​​the side of the noise-reducing baffle 13 facing away from the direction of liquid flow. The pressure here will differ from the pressure in the surrounding noise-reducing channels of the noise-reducing baffle 13, resulting in pressure imbalance and potentially causing noise. The design of the central hole 134 makes the liquid flow distribution more uniform when passing through the noise-reducing baffle 13, and also allows the pressure in different parts of the liquid flow to be basically balanced during the process of passing through the noise-reducing baffle 13, which helps to reduce noise.

[0068] As a specific embodiment of this utility model, the thickness of the noise reduction baffle 13 is set to be between 0.5mm and 2mm.

[0069] To enhance the stability and ease of installation of the noise reduction baffle 13, please refer to the attached document. Figure 2 , 4 The inner wall of the slow flow hole 122 is designed with a first limiting platform 123. The end face of the noise reduction baffle 13 is tightly attached to the first limiting platform 123, while its outer wall is in contact with the inner wall of the slow flow hole 122.

[0070] As one embodiment of this utility model, see the appendix. Figure 4 The valve core 12 has a second limiting platform 124 formed at its end, which is axially opposite to the first limiting platform 123. The noise reduction baffle 13 is disposed between the first limiting platform 123 and the second limiting platform 124, and the two end faces of the noise reduction baffle 13 are respectively fitted to the first limiting platform 123 and the second limiting platform 124.

[0071] In this embodiment, the two end faces of the noise reduction baffle 13 are respectively limited, which can further improve the stability of the noise reduction baffle 13 installation. The second limiting platform 124 can be formed by folding the end edge of the flow-slowing hole 122 inward during actual installation.

[0072] In this embodiment, the first limiting platform 123 and the second limiting platform 124 can be combined with the welding, riveting or other fixing methods mentioned above during actual production to make the installation of the noise reduction baffle more stable.

[0073] As one embodiment of this utility model, see the appendix. Figure 1 , 3 The valve body assembly 10 further includes a first connecting pipe 14 and a second connecting pipe 15. The first connecting pipe 14 is coaxially connected to the valve seat 11, and the second connecting pipe 15 is connected to the side wall of the valve seat 11 and communicates with the inner cavity of the valve seat 11. The valve core 12 is disposed between the first connecting pipe 14 and the second connecting pipe 15, and the second end of the valve core 12 is disposed inside the first connecting pipe 14.

[0074] In this embodiment, the first connecting pipe 14 and the second connecting pipe 15 can serve as the mounting base for pipeline components in the equipment. The expansion valve of this utility model can be conveniently connected to the liquid flow pipeline in the equipment through the first connecting pipe 14 and the second connecting pipe 15.

[0075] The second end of the valve core 12 is located inside the first connecting pipe 14. In this embodiment, during the production of the expansion valve, the noise reduction baffle 13 and the valve core 12 can generally be assembled in advance, and then the assembly of the valve core 12 and the noise reduction baffle 13 can be installed together in the valve body. Finally, the first connecting pipe 14 is sleeved on the outside of the valve core 12 and connected to the valve body.

[0076] The noise reduction principle of the noise reduction baffle has been explained above. In actual installation, under certain circumstances, the noise reduction baffle can be placed directly inside the first connecting pipe 14. That is, by firmly installing the noise reduction baffle 13 on the inner wall of the first connecting pipe 14, the expected noise reduction effect can also be achieved.

[0077] The expansion valve in this embodiment can be applied in air conditioning systems, refrigeration and freezing equipment, and heat pump systems in actual use.

[0078] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An expansion valve, comprising a valve body assembly (10) and a valve needle (20), the valve body assembly (10) comprising a valve seat (11) and a valve core (12), a first end of the valve core (12) being disposed within the valve seat (11), a valve hole (121) being formed on the valve core (12), the valve needle (20) being opposite to the valve hole (121) and capable of approaching or moving away from the valve hole (121) to adjust the opening degree of the expansion valve; characterized in that, A flow-slowing hole (122) is formed on the valve core (12). The flow-slowing hole (122) is coaxial with the valve hole (121) and communicates with it. The diameter of the flow-slowing hole (122) is larger than the diameter of the valve hole (121). The valve body assembly (10) also includes a noise reduction baffle (13), which is fixed inside the slow flow hole (122) and is spaced apart from the valve hole (121). A noise reduction channel is formed on the noise reduction baffle (13), and the liquid in the valve body assembly (10) flows between the valve hole (121), the slow flow hole (122) and the noise reduction channel.

2. The expansion valve according to claim 1, characterized in that, The noise reduction baffle (13) has a plurality of through holes (133) circumferentially distributed around the axis of the noise reduction baffle. The through holes (133) penetrate the noise reduction baffle (13) and form a circumferentially closed structure. The plurality of through holes (133) together form the noise reduction channel.

3. The expansion valve according to claim 2, characterized in that, The number of through holes (133) is 2 to 10.

4. The expansion valve according to claim 1, characterized in that, The noise reduction baffle (13) includes a baffle body (131) and a plurality of protruding teeth (132). The plurality of protruding teeth (132) protrude from the outer side wall of the baffle body (131) and are circumferentially spaced around the axis of the baffle body (131). The gap between adjacent protruding teeth (132) forms the noise reduction channel.

5. The expansion valve according to any one of claims 1 to 4, characterized in that, The thickness of the noise reduction baffle (13) is between 0.5 mm and 2 mm.

6. The expansion valve according to any one of claims 1 to 4, characterized in that, The noise reduction baffle (13) is made of metal and is welded or riveted to the valve core (12).

7. The expansion valve according to any one of claims 1 to 4, characterized in that, A central hole (134) is formed on the noise reduction baffle (13), the central hole (134) penetrates the noise reduction baffle (13), the central hole (134) is coaxial with the valve hole (121), and the diameter of the central hole (134) is smaller than the diameter of the valve hole (121).

8. The expansion valve according to any one of claims 1 to 4, characterized in that, A first limiting platform (123) is formed on the inner wall of the slow flow hole (122), the end face of the noise reduction baffle (13) is fitted with the first limiting platform (123), and the outer wall of the noise reduction baffle (13) abuts against the inner wall of the slow flow hole (122).

9. The expansion valve according to claim 8, characterized in that, The valve core (12) has a second limiting platform (124) formed at its end, which is axially opposite to the first limiting platform (123). The noise reduction baffle (13) is disposed between the first limiting platform (123) and the second limiting platform (124). The two end faces of the noise reduction baffle (13) are respectively attached to the first limiting platform (123) and the second limiting platform (124).

10. The expansion valve according to any one of claims 1 to 4, characterized in that, The valve body assembly (10) further includes a first connecting pipe (14) and a second connecting pipe (15). The first connecting pipe (14) is coaxially connected to the valve seat (11), and the second connecting pipe (15) is connected to the side wall of the valve seat (11) and communicates with the inner cavity of the valve seat (11). The valve core (12) is disposed between the first connecting pipe (14) and the second connecting pipe (15), and the second end of the valve core (12) is disposed inside the first connecting pipe (14).

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