Expansion valve
By setting a main flow channel and a first drainage channel in the expansion valve, and using the flow velocity difference to form a buffer film, the problem of high noise in electronic expansion valves is solved, and noise is effectively reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2026-03-27
AI Technical Summary
The electronic expansion valve generates cavitation when the refrigerant flows, resulting in excessive noise.
A main flow channel and a first flow channel are set in the expansion valve to form a buffer film due to the difference in refrigerant flow rate, thereby suppressing the generation of cavitation bubbles.
It effectively reduces the noise of the electronic expansion valve and lowers the noise when cavitation bubbles burst.
Smart Images
Figure CN121739639A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a refrigeration device, in particular to an expansion valve. BACKGROUND
[0002] The electronic expansion valve controls the voltage or current applied to the expansion valve by using the electrical signal generated by the regulated parameter, so as to achieve the purpose of regulating the liquid supply.
[0003] In the related art, the electronic expansion valve generally includes a valve cavity, a valve needle assembly, a valve port, an inlet pipeline and an outlet pipeline. The valve needle assembly controls the opening and closing of the valve port to control the communication between the inlet pipeline and the outlet pipeline. When the refrigerant flows through the valve port, the sudden drop of the flow area causes the pressure to drop suddenly, which often causes the refrigerant to cavitate and generate bubbles. The breaking of the bubbles will produce a large noise, which will cause the electronic expansion valve to produce a large noise. SUMMARY
[0004] The present application aims to provide an expansion valve with low noise.
[0005] In order to achieve the above purpose, the present application provides an expansion valve, which comprises a valve seat assembly, a valve needle and a noise reduction structure, the valve seat assembly has an inlet flow channel and a valve cavity, the valve needle is at least partially located in the valve cavity, the noise reduction structure is located in the valve seat assembly, and along the height direction of the expansion valve, the noise reduction structure is at least partially located between the inlet flow channel and the valve cavity.
[0006] The noise reduction structure has a main flow channel penetratingly arranged, the main flow channel is in communication with the inlet flow channel; the main flow channel comprises a valve port passage, the valve port passage has a valve port; the expansion valve has a first state, in the first state, the valve needle penetrates the valve port, and the valve needle is at least partially located in the valve port passage.
[0007] The noise reduction structure has a first flow guide passage, the first flow guide passage is tubular, the first flow guide passage is in communication with the main flow channel, and the first flow guide passage is in communication with the inlet flow channel; the first flow guide passage has a first flow guide port and a second flow guide port; the noise reduction structure comprises a first inner wall surface, the first inner wall surface is the inner wall surface corresponding to the valve port passage, the first flow guide port is arranged on the first inner wall surface, and the second flow guide port is arranged on the outer surface of the noise reduction structure; the first flow guide port and the second flow guide port are coaxially arranged.
[0008] Among them, the expansion valve has a first direction and a second direction, the first direction intersects with the second direction, the main flow channel extends along the first direction, and the first flow guide passage extends along the second direction.
[0009] In the application, the expansion valve is provided with a main flow channel and a first flow channel, the expansion valve has a first direction and a second direction, the first direction intersects with the second direction, the main flow channel extends along the first direction, and the first flow channel extends along the second direction. The first flow channel is arranged to intersect with the main flow channel, so that part of the refrigerant flows from the inlet flow channel into the first flow channel. The flow rate of the refrigerant in the first flow channel is greatly different from the flow rate of the refrigerant in the main flow channel, so that when the refrigerant in the first flow channel flows into the main flow channel, a buffer film is formed on the wall surface of the main flow channel, which is beneficial to adjust the pressure of the main flow channel, inhibit the generation of cavitation bubbles, reduce the bubble rupture, and thus reduce the noise of the electronic expansion valve. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 FIG. 1 is a cross-sectional schematic view of the expansion valve of the application.
[0011] Figure 2 FIG. 2 is a cross-sectional schematic view of the valve seat assembly and the noise reduction structure of the application. Figure 1
[0012] Figure 3 Figure 1 FIG. 4 is a cross-sectional schematic view of the noise reduction structure of the application.
[0013] Figure 4 Figure 1 FIG. 5 is a cross-sectional schematic view of the noise reduction structure of the application.
[0014] Figure 5 Figure 1 FIG. 6 is a perspective schematic view of the noise reduction structure of the application.
[0015] Figure 6 Figure 1 FIG. 7 is a perspective schematic view of the noise reduction structure of the application.
[0016] Figure 7 Figure 1 FIG. 8 is a perspective schematic view of the noise reduction structure of the application. DETAILED DESCRIPTION
[0017] The exemplary embodiments of the application will be described in detail below with reference to the accompanying drawings.
[0018] As Figures 1 to 7 An expansion valve according to the present application is shown, which comprises a valve seat assembly 1, a valve needle 2 and a noise reduction structure 3. The valve seat assembly 1 has an inlet flow channel 4 and a valve cavity 12, the valve needle 2 is at least partially located in the valve cavity 12, and the noise reduction structure 3 is located in the valve seat assembly 1, and at least partially between the inlet flow channel 4 and the valve cavity 12 in the height direction of the expansion valve. The noise reduction structure 3 has a main flow channel 30 passing therethrough, the main flow channel 30 is in communication with the inlet flow channel 4, and the main flow channel 30 comprises a valve port passage 301, the valve port passage 301 has a valve port 302, the expansion valve has a first state, in the first state, the valve needle 2 penetrates the valve port 302, and the valve needle 2 is at least partially located in the valve port passage 301.
[0019] Specifically, referring to Figure 1 , the valve seat assembly 1 has an inlet flow channel 4 and a valve cavity, the valve needle 2 is partially located in the valve cavity, the valve needle 2 can move relative to the valve seat assembly 1, and the valve needle 2 can move linearly relative to the valve seat assembly 1 in the height direction of the expansion valve. In the height direction of the expansion valve, the main flow channel 30 comprises a valve port passage 301, and the main flow channel 30 and the valve port passage 301 have equal flow cross-sectional areas. In other words, when the valve port passage 301 can flow fluid, the fluid can flow in the valve port passage 301 in the length direction of the valve port passage 301, and when the fluid flows through the valve port passage 301, the fluid can ensure that a constant fluid force flows in the valve port passage 301.
[0020] Further, referring to Figure 1 and Figure 2 , the valve port passage 301 has a valve port 302, the valve port 302 is located at the end of the valve port passage 301 closer to the inlet flow channel 4, and in the height direction of the expansion valve, the valve port 302 is located between the valve port passage 301 and the valve cavity 12. The expansion valve has an open valve state, in the open valve state, the main flow channel 30 and the valve port passage 301 are in communication with the valve cavity 12, that is, the fluid can enter the valve cavity 12 from the valve port passage 301, or the fluid can enter the valve port passage 301 from the valve cavity 12. The expansion valve has a closed valve state, in the closed valve state, the valve needle 2 is at least partially located in the valve port passage 301, the valve needle 2 penetrates the valve port 302 and blocks the valve port 302, the valve port 302 is in a closed state, and the fluid cannot flow between the valve port passage 301 and the valve cavity 12 through the valve port 302.
[0021] During the operation of the expansion valve, when the fluid flows through the valve port 302, the flow cross-sectional area of the fluid becomes smaller, which causes a large pressure difference before and after the valve port 302, thereby causing the fluid to change phase and cavitation phenomenon to occur. The cavitation phenomenon can generate a large number of bubbles, and the bubbles in the expansion valve can experience the processes of generation, growth, aggregation and collapse, which can produce bubble breaking sound, impact sound of sound waves generated by bubble breaking impacting the expansion valve, etc., collectively referred to as cavitation noise. In order to reduce the above-mentioned cavitation noise, the expansion valve provided by the present application has a flow guide passage.
[0022] In some embodiments, the noise reduction structure 3 has a first flow guide channel 31, the first flow guide channel 31 is tubular, the first flow guide channel 31 is in communication with the main flow channel 30, and the first flow guide channel 31 is in communication with the inlet flow channel 4. The first flow guide channel 31 has a first flow guide port 311 and a second flow guide port 312. The noise reduction structure 3 includes a first inner wall surface 304, which is the inner wall surface corresponding to the valve port channel 301, the first flow guide port 311 is arranged on the first inner wall surface, and the second flow guide port 312 is arranged on the outer surface of the noise reduction structure 3. The first flow guide port 311 and the second flow guide port 312 are coaxially arranged.
[0023] Specifically, referring to Figure 2 and Figure 5 , the expansion valve provided by the present application includes a noise reduction structure 3, the noise reduction structure 3 has a first flow guide channel 31, the first flow guide channel 31 is in communication with the main flow channel 30, that is, in communication with the valve port channel 301. The first flow guide channel 31 is arranged to adjust the pressure of the main flow channel 30 and the valve port channel 301. In the open valve state, the fluid flows from the inlet channel 4 through the main flow channel 30 into the valve cavity 12, and part of the fluid flows into the first flow guide channel 31, which is beneficial to adjust the pressure of the valve port channel 301 and reduce the cavitation noise.
[0024] Further, referring to Figure 2 and Figure 3 , the first flow guide channel 31 has a first flow guide port 311 and a second flow guide port 312, the first flow guide port 311 is located on the wall forming the valve port channel 301, that is, the first inner wall surface 304, and the second flow guide port 312 is located on the outer surface of the noise reduction structure 3. The first flow guide channel 31 is a straight channel, and the first flow guide port 311 and the second flow guide port 312 are coaxially arranged. The fluid flows through the first flow guide channel 31 through the first flow guide port 311 and the second flow guide port 312. The first flow guide port 311 and the second flow guide port 312 are arranged on the wall of the valve port 301 and the outer wall of the noise reduction structure 3, respectively, which can make more fluid flow from the inlet channel 4 or the valve port channel 301 into the first flow guide channel 31, thereby improving the effect of balancing the pressure of the valve port channel 301 by the first flow guide channel 31, and further improving the effect of reducing the cavitation noise by the first flow guide channel 31, so that the expansion valve provided by the present application has better effect of reducing the cavitation noise.
[0025] In some embodiments, the expansion valve has a first direction X1 and a second direction X2, the first direction X1 intersects the second direction X2, the main flow channel 30 extends along the first direction X1, and the first flow guide channel 31 extends along the second direction X2.
[0026] Specifically, referring to Figure 2 and Figure 4The center line of the main flow channel 30 is a straight line, the main flow channel 30 extends along the first direction X1, the first flow guide channel 31 is a straight channel, and extends along the second direction X2. The first direction X1 intersects the second direction X2, that is, the main flow channel 30 intersects the first flow guide channel 31. The first flow guide channel 31 intersects the main flow channel 30, so that part of the refrigerant flows into the main flow channel 30 through the first flow guide channel 31. Since the pipe diameter of the first flow guide channel 31 is smaller than the pipe diameter of the main flow channel 30, the flow rate of the fluid in the first flow guide channel 31 is greater than the flow rate of the fluid in the main flow channel 30. Therefore, when the refrigerant in the first flow guide channel 31 flows into the main flow channel 30, a buffer film is formed on the wall surface of the main flow channel 30, the generation of cavitation bubbles is inhibited, the sound of bubble rupture is weakened, and the noise of the electronic expansion valve is reduced.
[0027] In some embodiments, the first direction X1 is parallel to the height direction of the expansion valve, and an included angle a is formed between the first direction X1 and the second direction X2. The opening of the included angle a is opposite to the valve cavity (12), and the included angle a is greater than or equal to 45° and less than or equal to 75°.
[0028] Specifically, referring to Figure 2 and Figure 4 , the expansion valve has a height direction, the first direction X1 is parallel to the height direction of the expansion valve, the first direction X1 intersects the second direction X2, and an included angle a is formed opposite to the valve cavity. The included angle a is less than or equal to 75°, that is, the included angle a is not more than 75° at most and not less than 45° at least. The setting of the included angle of the expansion valve greater than or equal to 45° can ensure that the first flow guide channel 31 plays a role of flow division, and there is enough fluid flowing into the first flow guide channel 31. At the same time, the flow rate of the refrigerant in the first flow guide channel 31 can be ensured. When the fluid flows from the inlet flow channel 4, flows through the second flow guide port 312 and flows out of the first flow guide channel 31, the included angle a less than 75° can ensure that when the fluid flows out of the first flow guide port 311, the fluid flows out of the valve port 302 according to its flow direction. If the included angle a is greater than 75°, when the fluid flows out of the first flow guide port 311 of the first flow guide channel 31, according to the original flow direction of the fluid, the fluid will impact the inner wall of the valve port channel 301, cavitation bubbles and fluid impact sound will be generated. Therefore, the expansion valve provided by the present application limits the included angle between the main flow channel 30 and the first flow guide channel 31 to 45° to 75°, which can ensure that the first flow guide channel 31 plays a role of pressure guide, and at the same time reduces the noise of the expansion valve.
[0029] In some embodiments, the noise reduction structure 3 has at least two first flow guide channels 31, which include a first sub-flow guide channel 313 and a second sub-flow guide channel 314, the first sub-flow guide channel 313 and the second sub-flow guide channel 314 have a first flow guide port 311 and a second flow guide port 312, respectively. The first sub-flow guide channel 313 and the second sub-flow guide channel 314 are arranged in axial symmetry with respect to the central axis of the valve port channel 301.
[0030] In particular, referring to Figure 3 , the noise reduction structure 3 has at least two first flow guide channels 31, which include a first sub-flow guide channel 313 and a second sub-flow guide channel 314, the first sub-flow guide channel 313 and the second sub-flow guide channel 314 are arranged in axial symmetry with respect to the central axis of the valve port channel 301. The noise reduction structure 3 can also have multiple sub-flow guide channels, for example, when the noise reduction structure 3 has three first flow guide channels 31, the three first flow guide channels 31 are arranged in central symmetry with respect to the center of the valve port channel 301, the noise reduction structure 3 can also have four, five, six, etc. sub-flow guide channels, which will not be described here. The multiple first flow guide channels 31 are arranged in central symmetry with respect to the center of the valve port channel 301, that is, the multiple first flow guide channels 31 are uniformly distributed along the circumferential wall of the valve port channel 301. The multiple first flow guide channels 31 have a first flow guide port 311 and a second flow guide port 312, respectively, the multiple first flow guide ports 311 are uniformly distributed along the circumferential wall of the valve port channel 301, and the multiple second flow guide ports 312 are uniformly distributed along the outer surface of the noise reduction structure 3.
[0031] In some embodiments, the noise reduction structure 3 includes a first part 33 and a second part 34, along the height direction of the expansion valve, the first part 33 is closer to the valve cavity 12 than the second part 34, the first flow guide channel 31 is arranged in the first part 33, a part of the main flow passage 30 is located in the first part 33, another part of the main flow passage 30 is located in the second part 34, and the second part 34 is at least partially located in the inlet flow passage 4. The expansion valve has a shunt channel 41, which is at least partially located between the second part 34 and the pipe wall of the inlet pipe 4 in a direction perpendicular to the height direction of the expansion valve, and the shunt channel 41 communicates with the first flow guide channel 31.
[0032] In particular, referring to Figure 2 and Figure 5 , along the height direction of the expansion valve, the first part 33 of the noise reduction structure 3 is closer to the valve cavity 12 than the second part 34, and the second part 34 is partially located in the inlet flow passage 4. The first flow guide channel is located in the first part 33, the valve port channel 301 is arranged in the first part 33, and another part of the main flow passage 30 is located in the second part 32. Further, the expansion valve has a shunt channel 41, referring to Figure 1 and Figure 2The outer surface of the second part 34 and the pipe wall of the inlet pipe 4 have a gap, which is a circular cavity channel, i.e., a diversion channel 41, and the diversion channel 41 is at least partially located in the inlet flow channel 4 and communicates with the first diversion channel 31. When the fluid flows into the expansion valve from the inlet pipe 4, the bubble flow is distributed, and is affected by the space extrusion and the wall roughness. When the large bubbles in the bubble flow hit the rough wall, bubble breaking is easy to occur, which can easily cause noise. The diversion channel 41 is arranged, the fluid flowing into the valve port channel 301 from the diversion channel 41 has a faster flow rate, which is quite different from the flow rate of the fluid flowing into the main flow channel 30. Therefore, a buffer film is formed on the wall surface of the valve port channel 301, the flow state of the refrigerant is changed to annular flow, bubble breaking is reduced, and the effect of reducing the noise of the expansion valve is improved.
[0033] In some embodiments, the main flow channel 30 includes an expansion channel 303. The expansion channel 303 is located on one side of the valve port channel 301 in the height direction of the expansion valve, the expansion channel 303 is away from the valve cavity 12 relative to the valve port channel 301, the valve port channel 301 communicates with the expansion channel 303, and the expansion channel 303 communicates with the inlet channel 4. In the height direction of the expansion valve, the flow cross-sectional area of the valve port channel 301 is a fixed value, and the expansion channel 303 is arranged in a trumpet shape. In the height direction of the expansion valve, the flow cross-sectional area of the expansion channel 303 gradually increases away from the valve cavity 12.
[0034] Specifically, referring to Figure 2 and Figure 5 , the main flow channel 30 includes an expansion channel 303. The valve port channel 301 communicates with the expansion channel 303, the expansion channel 303 communicates with the inlet channel 4, the expansion channel 303 is located between the valve port channel 301 and the inlet channel 4, and the expansion channel 303 is away from the valve port 302 relative to the valve port channel 301. The valve port channel 301 and the expansion channel 303 are coaxially arranged, and in the height direction of the expansion valve, the valve port channel 301 and the expansion channel 301 extend along the same axis. Further, referring to Figure 2 , the valve port channel 301 has an equal flow cross-sectional area, and the expansion channel 303 is a trumpet-shaped channel. The small end of the expansion channel 303 is close to the valve port channel 301, and the flow cross-sectional area of the expansion channel 303 gradually increases away from the valve port channel 301. It should be noted that the flow cross-sectional area of the expansion channel 303 is defined as the projection area of the orthographic projection of the inner side wall forming the expansion channel 303 onto the projection plane perpendicular to the height direction of the expansion valve. The flow cross-sectional area of the expansion channel 303 gradually increases and is larger than the flow cross-sectional area of the valve port channel 301, which is beneficial to increase the flow of the refrigerant and gradually reduce the flow area of the refrigerant, avoid pressure drop, and weaken the generation of cavitation bubble noise.
[0035] In some embodiments, the noise reduction structure 3 has a second flow channel 32, the second flow channel 32 is tubular, the second flow channel 32 is in communication with the main flow channel 30 and the first flow channel 31. The second flow channel 32 includes a first flow port 321 and a second flow port 322, the noise reduction structure 3 includes a second inner wall surface 305 and a third inner wall surface 306, the second inner wall surface 305 is the inner wall surface corresponding to the first flow channel 31, the third inner wall surface 306 is the inner wall surface corresponding to the expansion channel 303, the first flow port 321 is arranged on the second inner wall surface 305, and the second flow port 322 is arranged on the third inner wall surface 306. The first flow port 321 and the second flow port 322 are coaxially arranged.
[0036] Specifically, referring to Figure 2 and Figure 4 , the noise reduction structure 3 has a second flow channel 32, the second flow channel 32 is in communication with the main flow channel 30 and the first flow channel 31. The second flow channel 32 is a straight pipe, and the second flow channel 32 has an equal flow cross-sectional area. The first flow port 321 and the second flow port 322 are coaxially arranged. The first flow port 321 is arranged on the inner wall surface corresponding to the first flow channel 31, i.e., the second inner wall surface 305, and the second flow port is arranged on the inner wall surface corresponding to the expansion channel 303. The design of the second flow channel 32 can introduce the refrigerant entering from the expansion section into the first flow channel 31, increase the flow of the first flow channel 31, further expand the flow rate of the fluid in the first flow channel 31, the greater the flow rate difference, the thicker the buffer film formed on the wall surface of the valve port channel 301, further reducing the risk of bubbles in the bubble flow contacting the wall surface, reducing bubble rupture, and thereby reducing the noise of the expansion valve.
[0037] In some embodiments, the noise reduction structure 3 has at least two second flow channels 32, the at least two second flow channels 32 include a first sub-flow channel 323 and a second sub-flow channel 324, the first sub-flow channel 323 and the second sub-flow channel 324 have respective first flow ports 321 and second flow ports 322. The first sub-flow channel 323 and the second sub-flow channel 324 are arranged in axial symmetry with respect to the center axis of the expansion channel 303.
[0038] The first flow channel (31) corresponds to the second flow channel (32).
[0039] Specifically, referring to Figure 3 and Figure 5, the second flow channel 32 is provided with at least two second flow channels 32, the second flow channel 32 has a first sub-flow channel 323 and a second sub-flow channel 324, the first sub-flow channel 323 and the second sub-flow channel 324 are arranged in axial symmetry with respect to the central axis of the expansion channel 303. The second flow channel 32 can also be provided with multiple sub-flow channels, for example, when the second flow channel is provided with three second flow channels, the second flow channels 32 are arranged in central symmetry with respect to the center of the expansion channel 303, that is, the multiple second flow channels 32 are arranged in central symmetry with respect to the center of the expansion channel 303, the second flow channels 32 can also be provided with four, five, six, etc., which will not be described here. The multiple second flow channels 32 are arranged in central symmetry with respect to the center of the expansion channel 303, that is, the multiple second flow channels 32 are uniformly distributed along the circumferential wall of the expansion channel 303. The multiple second flow channels 32 have respective first flow ports 321 and second flow ports 322. It should be noted that the number of the first flow channels 31 and the second flow channels 32 is the same and corresponds to each other, each first flow channel 31 corresponds to a respective second flow channel 32, that is, each first flow channel 31 has a first flow port 321. The design of the second flow channel 32 can also compensate for the fluid in the first flow channel 31, when impurities in the refrigerant accidentally block the first flow port 311 or the second flow port 312, the refrigerant can flow into the second flow channel 32 through the second flow port 322 distributed on the expansion channel 303, and then flow into the first flow channel 31, to ensure the realization of the function of the first flow channel 31. It should be noted that the cross-sectional shape of the first flow channel 31 can be any one of a circle, an ellipse, a square, and a polygon, and the cross-sectional shape of the second flow channel 32 can be any one of a circle, an ellipse, a square, and a polygon, and the shapes of the two channels can be arbitrarily matched when used in communication, which is within the scope of the present application.
[0040] In some embodiments, the expansion valve has a third direction X3 intersecting the first direction X1 and the second direction X2, the second flow channel 32 extends along the third direction X3, an included angle β is formed between the third direction X3 and the second direction X2, the opening of the included angle β faces away from the valve cavity 12, and the included angle β is greater than or equal to 90° and less than or equal to 120°.
[0041] Specifically, referring to Figure 2 and Figure 4The third direction X3 intersects the first direction X1, the third direction X3 intersects the second direction X2, and the third direction X3 and the second direction X2 form an included angle β opposite to the valve cavity 12, the included angle β is greater than or equal to 90° and less than or equal to 120°, that is, the included angle β is between 90° and 120°. When the included angle β is less than 120°, the flow direction of the refrigerant flowing into the first flow channel 31 through the second flow channel 32 and the flow direction of the refrigerant flowing into the first flow channel 31 through the flow distribution channel 41 do not conflict, reducing the generation of bubbles and fluid impact sound. The included angle β is greater than or equal to 90°, which is beneficial to form a loop, and at the same time, the second flow channel 32 can reduce pressure loss during flow distribution, better realizing the pressure distribution function of the second flow channel 32.
[0042] In some embodiments, the first part 22 includes an outer surface, the outer surface including a sealing surface 35 and a supporting surface 36, the sealing surface 35 being connected to the supporting surface 36, and along the height direction of the expansion valve, the sealing surface 35 is closer to the valve cavity 12 than the supporting surface 36. The second flow port 312 is arranged on the supporting surface 36, and the at least two second flow ports 312 are arranged in axial symmetry along the central axis of the valve port channel 301.
[0043] Specifically, referring to Figure 6 and Figure 7 , the outer surface of the first part 22 includes a sealing surface 35 and a supporting surface 36, and the second flow port 312 is located on the supporting surface 36, that is, the at least two second flow ports 312 are uniformly distributed along the supporting surface 36. The sealing surface 35 is fixedly connected to the supporting surface 36, and the supporting surface 36 can support the noise reduction structure 3 to prevent the noise reduction structure 3 from being separated due to insufficient sealing.
[0044] In some embodiments, the valve seat assembly 1 has an outlet channel 5, and the inlet channel 4 and the outlet channel 5 are both in communication with the valve cavity 12. The valve seat assembly 1 includes a valve seat sealing surface 13, and along the height direction of the expansion valve, the valve seat sealing surface 13 is closer to the inlet pipe 4 than the valve cavity 12, and the sealing surface 35 is sealingly connected to the valve seat sealing surface 13.
[0045] Specifically, referring to Figure 6 and Figure 7 , the valve seat assembly 1 includes an inlet channel 4 and an outlet channel 5, and the inlet channel 4 and the outlet channel 5 are in communication with the valve cavity 12 in the open valve state. The valve seat assembly 1 includes a valve seat sealing surface 13, and the expansion valve has a mounting channel, and the valve seat sealing surface 13 and the sealing surface 35 are part of the inner wall of the mounting channel. The valve seat sealing surface 13 and the sealing surface 35 are interference fit, realizing the sealing of the expansion valve.
[0046] The technical principles of the present application are described above in combination with specific embodiments, but it should be noted that the above description is only to explain the principles of the present application, and cannot be interpreted in any way as a specific limitation on the protection scope of the present application. Based on the explanation here, other technical solutions or equivalent replacements of the present application that can be thought of by those skilled in the art without creative labor will all fall within the protection scope of the present application.
Claims
1. An expansion valve, characterized in that: The valve includes a valve seat assembly (1), a valve needle (2), and a noise reduction structure (3). The valve seat assembly (1) has an inlet flow channel (4) and a valve cavity (12). The valve needle (2) is at least partially located in the valve cavity (12). The noise reduction structure (3) is located within the valve seat assembly (1) and, along the height direction of the expansion valve, is at least partially located between the inlet flow channel (4) and the valve cavity (12). The noise reduction structure (3) has a through-flow main channel (30) that is connected to the inlet channel (4); the main channel (30) includes a valve port channel (301) with a valve port (302); the expansion valve has a first state in which the valve needle (2) passes through the valve port (302) and is at least partially located in the valve port channel (301); The noise reduction structure (3) has a first drainage channel (31), which is tubular and connected to the main flow channel (30) and the inlet flow channel (4). The first drainage channel (31) has a first drainage port (311) and a second drainage port (312). The noise reduction structure includes a first inner wall surface (304), which is the inner wall surface corresponding to the valve port channel (301). The first drainage port (311) is located on the first inner wall surface (304), and the second drainage port (312) is located on the outer surface of the noise reduction structure (3). The first drainage port (311) and the second drainage port (312) are coaxially arranged. The expansion valve has a first direction X1 and a second direction X2, the first direction X1 and the second direction X2 intersect, the main flow channel (30) extends along the first direction X1, and the first drainage channel (31) extends along the second direction X2.
2. The expansion valve as described in claim 1, characterized in that: The first direction X1 is parallel to the height direction of the expansion valve, and the first direction X1 and the second direction X2 form an angle α. The opening of the angle α faces away from the valve cavity (12). The angle α is greater than or equal to 45° and less than or equal to 75°.
3. The expansion valve as described in claim 2, characterized in that: The noise reduction structure (3) has at least two first drainage channels (31), each of which includes a first sub-drainage channel (313) and a second sub-drainage channel (314). The first sub-drainage channel (313) and the second sub-drainage channel (314) each have a first drainage port (311) and a second drainage port (312). The first sub-drainage channel (313) and the second sub-drainage channel (314) are axially symmetrical about the central axis of the valve port channel (301).
4. The expansion valve as described in claim 1, characterized in that: The noise reduction structure (3) includes a first part (33) and a second part (34). Along the height direction of the expansion valve, the first part (33) is closer to the valve cavity (12) than the second part (34). The first drainage channel (31) is disposed in the first part (33). The main flow channel (30) is partially located in the first part (33). The main flow channel (30) is partially located in the second part (34). The second part (34) is at least partially located in the inlet flow channel (4). The expansion valve has a diversion channel (41) in a direction perpendicular to the height of the expansion valve. The diversion channel (41) is at least partially located between the second portion (34) and the wall of the inlet pipe (4). The diversion channel (41) is connected to the first drainage channel (31).
5. The expansion valve as described in claim 1, characterized in that: The main channel (30) includes an expansion channel (303). Along the height direction of the expansion valve, the expansion channel (303) is located on one side of the valve port channel (301). The expansion channel (303) is away from the valve cavity (12) relative to the valve port channel (301). The valve port channel (301) communicates with the expansion channel (303). The expansion channel (303) communicates with the inlet channel (4). Along the height direction of the expansion valve, the flow cross-sectional area of the valve port channel (301) is a fixed value, and the expansion channel (303) is arranged in a trumpet shape. Along the height direction of the expansion valve, the flow cross-sectional area of the expansion channel (303) gradually increases in the direction away from the valve cavity (12).
6. The expansion valve according to any one of claims 1 to 5, characterized in that: The noise reduction structure (3) has a second drainage channel (32), which is tubular and connected to the main channel (30). The second drainage channel (32) is also connected to the first drainage channel (31). The second drainage channel (32) includes a first guide port (321) and a second guide port (322). The noise reduction structure (3) includes a second inner wall surface (305) and a third inner wall surface (306). The second inner wall surface (305) is the inner wall surface corresponding to the first drainage channel (31), and the third inner wall surface (306) is the inner wall surface corresponding to the expansion channel (303). The first guide port (321) is located on the second inner wall surface (305), and the second guide port (322) is located on the third inner wall surface (306). The first guide port (321) and the second guide port (322) are coaxially arranged.
7. The expansion valve as described in claim 6, characterized in that: The noise reduction structure (3) has at least two second drainage channels (32), each of which includes a first branch drainage channel (323) and a second branch drainage channel (324). The first branch drainage channel (323) and the second branch drainage channel (324) each have a first guide port (321) and a second guide port (322). The first branch drainage channel (323) and the second branch drainage channel (324) are arranged axially symmetrically with respect to the central axis of the expansion channel (303). The first drainage channel (31) corresponds to the second drainage channel (32).
8. The expansion valve as described in claim 6, characterized in that: The expansion valve has a third direction X3, which intersects with the first direction X1 and the second direction X2. The second drainage channel (32) extends along the third direction X3. An angle β is formed between the third direction X3 and the second direction X2. The opening of the angle β faces away from the valve cavity (12). The angle β is greater than or equal to 90° and less than or equal to 120°.
9. The expansion valve as described in claim 4, characterized in that: The first portion (33) includes an outer surface, the outer surface including a sealing surface (35) and a supporting surface (36), the sealing surface (35) is connected to the supporting surface (36), and along the height direction of the expansion valve, the sealing surface (35) is closer to the valve cavity (12) relative to the supporting surface (36); The second drain port (312) is disposed on the support surface (36), and at least two second drain ports (312) are axially symmetrically distributed along the central axis of the valve port channel (301).
10. The expansion valve as described in claim 9, characterized in that: The valve seat assembly (1) has an outlet channel (5), and both the inlet channel (4) and the outlet channel (5) are connected to the valve cavity (12); The valve seat assembly (1) includes a valve seat sealing surface (13). Along the height direction of the expansion valve, the valve seat sealing surface (13) is close to the inlet pipe (4) relative to the valve cavity (12), and the sealing surface (35) is sealed to the valve seat sealing surface (13).