Self-balancing expansion valve

Abstract

The application provides a self-balancing expansion valve, and belongs to the technical field of air conditioner components. The self-balancing expansion valve solves the problem of the compactness of the structure of the existing expansion valve with defrosting function. The self-balancing expansion valve comprises a valve body, a female valve core, a male valve core and an elastic member. The female valve core has a through hole, and the inner wall of the through hole has a matching surface. The right end of the male valve core has a plug-in connector, which comprises a defrosting part, a left throttling part and a right throttling part. The outer wall of the left throttling part and the right throttling part both has a throttling surface. The diameter of the outer circumferential surface of the defrosting part is smaller than the diameter of the throttling surface. Under the action of the elastic member, the outer circumferential surface of the defrosting part is opposite to the matching surface and forms a defrosting channel. When the male valve core moves to either end and the outer circumferential surface of the defrosting part is misaligned with the matching surface, the matching surface can form a throttling channel with the opposite throttling surface. The structure of the self-balancing expansion valve is more compact.

Description

Technical Field

[0001] This invention belongs to the technical field of air conditioning components and relates to a self-balancing expansion valve. Background Technology

[0002] The refrigeration system is composed of four main components: compressor, condenser, expansion valve, and evaporator. The expansion valve is an important component in the refrigeration system. It is usually installed between the condenser and the evaporator. The expansion valve enables the gas evaporated in the evaporator to be liquefied into a high-temperature and high-pressure liquid refrigerant by the compressor. The gas is then throttled through its throttling orifice to become a low-temperature and low-pressure mist-like liquid refrigerant. The refrigerant then absorbs heat in the evaporator to achieve the refrigeration effect.

[0003] The expansion valve disclosed in patent application (application number: 201711366377.9) includes a valve core one and a columnar valve core two. The valve core one has a through throttling orifice, and the end face of the valve core two has a columnar connector that can be inserted into the throttling orifice. The outer diameter of the connector is smaller than the outer diameter of the valve core two. The inner wall of the throttling orifice has at least two straight cylindrical surfaces of different diameters from the orifice inward. The outer wall of the connector has at least two annular throttling walls of different diameters. When the connector is inserted into the throttling orifice, the throttling walls can face the straight cylindrical surfaces and form a throttling channel. When heating, the refrigerant pushes the valve core one to compress the spring one, realizing three-stage heating flow control. When cooling, the refrigerant pushes the valve core two to compress the spring two, realizing three-stage cooling flow control.

[0004] The above structure can achieve a certain flow regulation, but due to the low outdoor temperature in the north, the outdoor unit will frost before the air conditioner is started. Furthermore, during indoor heating in winter (i.e., the outdoor unit is cooling), frost will also form on the outdoor unit during indoor heating. Therefore, the outdoor unit needs to be defrosted periodically before starting the air conditioner and during indoor heating. This requires refrigerant to enter from the left end for defrosting during indoor cooling and outdoor heating. However, before starting, the male and female valve cores are normally closed, and the initial opening power is low, resulting in low pressure on the left end, making it difficult to push the male valve core from left to right. During defrosting in heating mode, the pressure on the left end drops rapidly, closing the male and female valve cores, thus hindering defrosting.

[0005] To address the aforementioned issues, a patent document (application number: 202210920687.5) discloses a normally open expansion valve, comprising a valve body and a valve core. Two fluid septa are fixed within the valve body, each with a through-hole. A throttling ring is circumferentially positioned on the wall of each through-hole. The valve core is located between the two fluid septa, and each end of the valve core has a connector. A return spring is provided between each end of the valve core and the two fluid septa. Under the action of the two return springs, the two connectors move away from their respective throttling rings. When the valve core moves to one end and compresses the return spring, the connector at that end can insert into the corresponding throttling ring, forming a throttling channel that regulates the flow rate through the movement of the valve core. In other words, the connectors at both ends are separated from their respective throttling rings, allowing refrigerant to pass through during defrosting. However, to achieve the defrosting function, this structure requires two connectors, which in turn require two throttling rings, resulting in a longer valve body and an overall less compact structure. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a self-balancing expansion valve to solve the problem that the existing expansion valves with defrosting functions are not compact enough.

[0007] The objective of this invention can be achieved through the following technical solution: A self-balancing expansion valve, comprising a tubular valve body, a female valve core fixed within the valve body, a male valve core slidably disposed within the valve body and located to the left of the female valve core, and an elastic element acting on the male valve core. The female valve core has an axially penetrating through-hole, and the inner wall of the through-hole has a circumferentially annular mating surface. The male valve core is characterized in that its right end has a columnar connector inserted into the through-hole. The connector axially includes a defrosting section, a left throttling section located to the left of the defrosting section, and a left throttling section located to the left of the defrosting section. The right throttling section on the right side of the defrosting section, the left throttling section, and the outer wall of the right throttling section all have several annular throttling surfaces. The throttling surfaces of the left throttling section are arranged in a manner where the diameter gradually decreases from right to left, and the throttling surfaces of the right throttling section are arranged in a manner where the diameter gradually decreases from left to right. The diameter of the outer circumferential surface of the defrosting section is smaller than the diameter of the throttling surface. Under the action of the elastic element, the outer circumferential surface of the defrosting section is opposite to the mating surface and forms a defrosting channel. When the male valve core moves to any end, causing the outer circumferential surface of the defrosting section to be misaligned with the mating surface, the mating surface can form a throttling channel with the opposite throttling surface.

[0008] When the unit is off, the elastic element acts on the male valve core, causing the male valve core's connector to pass through the throttling ring. The mating surface on the throttling ring is opposite to the outer peripheral surface of the defrosting section, forming a defrosting channel. The refrigerant enters from the left end port of the valve body, passes through the defrosting channel, and then flows out from the right end port. The outer peripheral surface of the defrosting section has a small diameter, resulting in a large passage area for the defrosting channel. Therefore, even when the air conditioning unit is just started up and the outdoor unit is defrosting, or when the indoor unit is temporarily stopped during heating and the refrigerant pressure is low, the refrigerant can still pass through quickly to achieve defrosting. After the outdoor unit defrosts, the indoor unit heats normally. At this time, the pressure difference between the two ends of the valve body increases, and the refrigerant flows in from the right end of the valve body, pushing the male valve core to move to the left. The outer peripheral surface of the defrosting part is misaligned with the mating surface, and the throttling surface on the right throttling part is opposite to the mating surface to form a throttling channel for the refrigerant to pass through during heating. Furthermore, by having the mating surface opposite to throttling surfaces of different diameters, throttling channels with different passing areas are formed to achieve flow regulation. During cooling, the male valve core moves to the right, and the mating surface is opposite to the throttling surface on the left throttling part to form a throttling channel for the refrigerant to pass through during cooling.

[0009] The left throttling section is used for cooling, and the right throttling section is used for heating. This allows for independent throttling surfaces for both cooling and heating, resulting in higher flow control accuracy. The throttling section, defrosting section, and right throttling section are all integrated into a single connector, making the male valve core more compact. Heating and cooling are achieved through the bidirectional movement of the male valve core. Only one connector is needed to perform cooling, heating, and defrosting functions, shortening the length of the male valve core. Only one female valve core is required for mating with it. Compared to existing expansion valves that use two connectors and two female valve cores for defrosting, this structure is much more compact. The defrosting section is located between the heating and cooling sections. This structure allows the male valve core to control cooling and heating separately through bidirectional movement. The mating surface only needs to be offset from the outer circumference of the defrosting section to directly form a throttling channel. The male valve core's travel distance is shorter, further contributing to the compact structure.

[0010] In the self-balancing expansion valve described above, the connector further includes two low-frequency sections along the axial direction. One low-frequency section is located between the left throttling section and the defrosting section, and the other low-frequency section is located between the right throttling section and the defrosting section. The outer circumferential diameter of the low-frequency section is smaller than the diameter of the adjacent throttling surface, and the outer circumferential diameter of the low-frequency section is larger than the outer circumferential diameter of the defrosting section. Unlike existing expansion valves where the throttling channel area gradually increases as the valve core moves, this application also includes a low-frequency section. The outer diameter of the low-frequency section is smaller than the diameter of the adjacent throttling surface. Therefore, taking refrigeration as an example, when the mating surface and different throttling surfaces are sequentially opposite each other to form throttling channels with progressively larger passing areas to achieve intermediate refrigeration mode, rated refrigeration mode, low-temperature rated refrigeration mode, and maximum refrigeration mode, the mating surface can also form a channel with the outer diameter of the low-frequency section. The passing area of ​​this channel is larger than the passing cross-sectional area in the intermediate refrigeration mode. Therefore, a low-temperature intermediate refrigeration mode is separated before the intermediate refrigeration mode. The increase in passing area can reduce the pressure difference requirement while ensuring the refrigerant flow rate, thereby reducing the operating frequency and energy consumption. Furthermore, the low-frequency section, defrosting section, left throttling section, and right throttling section are all integrated into a single connector, resulting in a more compact structure.

[0011] In the aforementioned self-balancing expansion valve, the inner wall of the through-hole of the mother valve core has a circumferentially annular throttling ring, and the inner wall of the throttling ring has a circumferentially annular mating portion. This mating portion is located at the right end of the inner hole of the throttling ring, and the inner circumferential surface of the mating portion is the aforementioned mating surface. The axial width of the mating surface is smaller than the axial width of the throttling ring, creating a flaring effect at the left end of the mating portion. During refrigeration, this flaring effect concentrates and guides the refrigerant flow, making the flow smoother. The smaller axial width of the mating surface compared to the outer circumferential surface of the defrost portion prevents interference with the refrigerant flow when the mating surface is opposite to the adjacent throttling surface during defrosting.

[0012] In the aforementioned self-balancing expansion valve, the elastic element includes a left adjusting spring and a positioning spring. The left adjusting spring acts on the left end of the male valve core, and the positioning spring acts between the male and female valve cores. Under the action of the left adjusting spring and the positioning spring, the outer peripheral surface of the defrosting section faces the mating surface, forming a defrosting channel. When the male valve core moves to the left and compresses the left adjusting spring, the throttling surface of the right throttling section faces the mating surface, forming a throttling channel. When the male valve core moves to the right and compresses the positioning spring, the throttling surface of the left throttling section faces the mating surface, forming a throttling channel. In the stopped state, the position of the male valve core is maintained by the left adjusting spring and the positioning spring, ensuring that the mating surface is stably facing the outer peripheral surface of the defrosting section. Even if refrigerant passes through during defrosting, it will not push the male valve core to move.

[0013] In the aforementioned self-balancing expansion valve, positioning posts are fixed at both ends of the valve body. A left adjusting spring is positioned between the left-end positioning post and the male valve core. The elastic element also includes a right adjusting spring, which is positioned between the right-end positioning post and the male valve core. The positioning posts at both ends are used to limit the movement of the left and right adjusting springs, ensuring stability. The right adjusting spring, in conjunction with the positioning springs, controls the position of the male valve core during refrigeration, improving the positional accuracy and stability of the male valve core in different refrigeration modes.

[0014] In the aforementioned self-balancing expansion valve, a limiting post is slidably mounted within the valve body. This limiting post is located between the positioning post on the right end and the female valve core, with one end inserted into the through hole of the female valve core and opposite to the end of the connector. The right adjusting spring acts between the positioning post and the limiting post on the right end. The limiting post, slidably inserted into the through hole of the female valve core, provides high stability. It serves as a stop when the male valve core moves to the left, limiting the position of the male valve core and improving its positional accuracy and stability under different cooling modes.

[0015] In the aforementioned self-balancing expansion valve, a spacer is also fixed axially within the valve body. The left end of the spacer is fixedly fitted onto the end of the left-side positioning pin, and the right end is fixedly fitted onto the end of the female valve core. The male valve core, the left adjusting spring, and the positioning spring are all housed within the spacer. Because the valve body has a certain length, its inner wall is difficult to machine and has low precision. Therefore, by using a separate spacer, the inner wall precision of the spacer is increased, allowing the male valve core to mesh with the spacer and improving the stability of the male valve core.

[0016] In the aforementioned self-balancing expansion valve, a cylindrical limiting seat is slidably provided between the limiting post and the right-end positioning post. The right end of the first right adjusting spring abuts against the right-end positioning post, and the left end abuts against the limiting seat. A second right adjusting spring is provided between the limiting seat and the limiting post. The right end of the second right adjusting spring abuts against the limiting seat, and the left end abuts against the limiting post. The starting spring force of the first right adjusting spring is greater than the spring force of the second right adjusting spring when it is compressed to the point where the limiting post and the limiting seat abut against each other. By setting the limiting seat, a second right adjusting spring can be added, thereby controlling the movement stroke of the valve core during refrigeration through the three springs: the positioning spring, the first right adjusting spring, and the second right adjusting spring, achieving five flow level refrigeration modes, specifically:

[0017] Low-temperature intermediate cooling mode: The male valve core compresses the positioning spring and moves to the right. The plug contacts the limit post. Neither the right adjustment spring one nor the right adjustment spring two is compressed. The mating surface is opposite to the outer peripheral surface of the low-frequency part.

[0018] Intermediate cooling mode: The male valve core continues to compress the positioning spring and moves to the right. The male valve core's connector pushes against the limit post. The second right adjusting spring is partially compressed, but the limit post has not yet contacted the limit seat, and the first right adjusting spring is not compressed.

[0019] Rated cooling mode: The male valve core continues to compress the positioning spring and move to the right. The male valve core's plug continues to push the limit post. The right adjusting spring is compressed until the male valve core abuts against the limit seat. The right adjusting spring is not compressed.

[0020] Low temperature rated cooling mode: The male valve core continues to compress the positioning spring and move to the right. The male valve core's plug continues to push the limit post, and the limit post pushes the limit seat. The right adjusting spring is partially compressed.

[0021] Maximum cooling mode: The male valve core continues to compress the positioning spring and move to the right. The male valve core's connector continues to push the limit post, and the limit post pushes the limit seat. The right adjusting spring is further compressed.

[0022] In the aforementioned self-balancing expansion valve, a cylindrical limiting seat is slidably provided between the male valve core and the left-end positioning post. The left end of the first left adjusting spring abuts against the left-end positioning post, and the right end abuts against the limiting seat. A second left adjusting spring is provided between the limiting seat and the male valve core. The left end of the second left adjusting spring abuts against the limiting seat, and the right end abuts against the male valve core. The starting spring force of the first left adjusting spring is greater than the spring force of the second left adjusting spring when compressed to the point where the male valve core abuts against the limiting seat. By setting the limiting seat, a second left adjusting spring can be provided, thereby controlling the movement stroke of the male valve core during heating through the two springs, the first and second left adjusting springs, to achieve five flow level heating modes, specifically:

[0023] Low temperature intermediate heating mode: The male valve core moves to the left, and the second left adjusting spring is partially compressed, but the male valve core has not yet contacted the limit seat, the first left adjusting spring is not compressed, and the mating surface is opposite to the outer peripheral surface of the low frequency part.

[0024] Intermediate heating mode: The male valve core continues to move to the left, and the second left adjusting spring is compressed until the male valve core abuts against the limit seat, while the first left adjusting spring is not compressed;

[0025] Rated heating mode: The male valve core continues to move to the left, the push limit seat moves and compresses a part of the left adjusting spring;

[0026] Low temperature customized heating mode: The male valve core continues to move to the left, the push limit seat continues to move and further compresses the left adjusting spring;

[0027] Maximum heating mode: The male valve core continues to move to the left, the push limit seat continues to move and further compresses the left adjusting spring.

[0028] In the aforementioned self-balancing expansion valve, the male valve core has an axially oriented flow channel one, the left end of which is connected to the left end port of the valve body, and the right end of which is connected to the left end of the through hole. The limiting post has an axially oriented flow channel two, the right end of which is connected to the right end port of the valve body, and the left end of which is connected to the right end of the through hole. This allows refrigerant to pass through, enabling both the male valve core and the limiting post to form a sliding guide fit with the female valve core, ensuring stability.

[0029] Compared with existing technologies, this self-balancing expansion valve has the following advantages:

[0030] 1. Since the throttling section, defrosting section and right throttling section are all integrated on a single connector, heating and cooling are achieved through the bidirectional movement of the male valve core. Only one connector is needed to achieve the three functions of cooling, heating and defrosting, which shortens the length of the male valve core. Only one female valve core is needed to cooperate with it, which shortens the length of the valve body, making the structure more compact, reducing the volume and manufacturing cost.

[0031] 2. Since the left throttling section is used for cooling and the right throttling section is used for heating, the throttling surfaces for cooling and heating are set independently, resulting in higher flow control accuracy. The defrosting section is located between the heating and cooling sections. This structure allows the male valve core to control cooling and heating separately by moving in both directions. As long as the mating surface is offset from the outer peripheral surface of the defrosting section, it can directly form a throttling channel. The male valve core has a shorter travel stroke, and the structure can be more compact.

[0032] 3. Due to the setting of the limiting post, the limiting post can limit the plug and keep it stable at a certain flow level. Therefore, it can realize five flow level cooling modes and the flow regulation accuracy is higher. Attached Figure Description

[0033] Figure 1 This is a structural cross-sectional view of a self-balancing expansion valve.

[0034] Figure 2 This is a partial structural cross-sectional view of the self-balancing expansion valve during refrigeration.

[0035] Figure 3 This is a partial structural cross-sectional view of the self-balancing expansion valve during heating.

[0036] Figure 4 yes Figure 1 Enlarged view of the structure at point A in the middle.

[0037] Figure 5 This is a cross-sectional view of the self-balancing expansion valve in Embodiment 2.

[0038] Figure 6 This is a cross-sectional view of the self-balancing expansion valve in Embodiment 3.

[0039] Figure 7 yes Figure 6 Enlarged view of the structure at point B.

[0040] Figure 8 This is a cross-sectional view of the self-balancing expansion valve in Embodiment 4.

[0041] Figure 9 This is a cross-sectional view of the self-balancing expansion valve in Embodiment 5.

[0042] Figure 10 This is a partial structural cross-sectional view of the self-balancing expansion valve in Embodiment Six.

[0043] In the diagram, 1. Valve body; 11. Refrigeration inlet; 12. Heating inlet; 13. Flow channel three; 14. Filter screen; 2. Female valve core; 21. Through hole; 211. Guide section; 22. Throttling ring; 23. Mating part; 231. Mating surface; 24. Through hole two; 3. Male valve core; 31. Connector; 311. Defrosting part; 312. Left throttling part; 313. Right throttling part; 314. Throttling surface; 315. Low frequency part; 32. Flow channel one; 33. Guide cone surface; 4. Limiting post; 41. Flow channel two; 42. Guide part; 43. Limiting part; 5. Positioning post; 51. Through hole; 52. Through hole one; 6. Limiting seat; 7. Defrosting channel; 8. Throttling channel; 9. Spacer; 101. Left adjusting spring one; 102. Left adjusting spring two; 103. Right adjusting spring one; 104. Right adjusting spring two; 105. Positioning spring. Detailed Implementation

[0044] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0045] Example 1:

[0046] like Figure 1As shown, a self-balancing expansion valve includes a tubular valve body 1. The left end of the valve body 1 is a refrigeration inlet 11, and the right end is a heating inlet 12. Filter screens 14 are fixed at both the refrigeration inlet 11 and the heating inlet 12. Positioning posts 5 are fixed at both ends of the valve body 1 inside the filter screens 14. A through hole 51 for refrigerant to pass through is provided axially on the positioning post 5. A columnar female valve core 2 is fixed inside the valve body 1. The outer circumferential surface of the female valve core 2 is pressed and sealed against the inner circumferential surface of the valve body 1. A through hole 21 is provided axially on the female valve core 2. The through hole 21 is coaxially arranged with the female valve core 2. A circumferentially annular throttling ring 22 is provided on the inner wall of the through hole 21. A circumferentially annular mating part 23 is provided on the inner wall of the throttling ring 22. The inner circumferential surface of the mating part 23 is a mating surface 231. A columnar male valve core 3 is slidably disposed within the valve body 1. This male valve core 3 is located to the left of the female valve core 2. A columnar connector 31 is located on the right end face of the male valve core 3. This connector 31 is coaxially disposed with the male valve core 3 and is inserted into the through hole 21 of the female valve core 2, passing through the throttling ring 22. Figure 2 As shown, the connector 31 includes a left throttling section 312, a defrosting section 311, and a right throttling section 313 arranged sequentially from left to right along the axial direction. Specifically, the left throttling section 312 is located to the left of the defrosting section 311, and the right throttling section 313 is located to the right of the defrosting section 311. The outer circumferential surfaces of both the left and right throttling sections 312 and 313 include three annular throttling surfaces 314. The three throttling surfaces 314 of the left throttling section 312 are arranged with their diameters gradually decreasing from right to left, and the throttling surfaces 314 of the right throttling section 313 are arranged with their diameters gradually decreasing from left to right. The outer circumferential surface of the defrosting section 311 is cylindrical, and the outer diameter of the outer circumferential surface of the defrosting section 311 is smaller than the outer diameter of any one of the throttling surfaces 314. A left adjusting spring 101 and a positioning spring 105 are also provided inside the valve body 1. The left adjusting spring 101 acts between the positioning post 5 and the male valve core 3 at the left end, and the positioning spring 105 acts between the male valve core 3 and the female valve core 2. Under the action of the left adjusting spring 101 and the positioning spring 105, the mating surface 231 on the mating part 23 is opposite to the outer peripheral surface of the defrosting part 311, and a defrosting channel 7 is formed between them. When the male valve core 3 moves to the right and compresses the positioning spring 105, the mating surface 231 is opposite to the throttling surface 314 on the left throttling part 312, and a throttling channel 8 for adjusting the refrigerant flow rate is formed between them. When the male valve core 3 moves to the left and compresses the left adjusting spring 101, the mating surface 231 is opposite to the throttling surface 314 on the right throttling part 313, and a throttling channel 8 for adjusting the refrigerant flow rate is formed between them.

[0047] Specifically, combined Figure 4As shown, a limiting post 4 is also slidably provided inside the valve body 1. The limiting post 4 is located between the positioning post 5 at the right end and the female valve core 2. The outer circumferential surface of the limiting post 4 has an annular guide portion 42, and the outer circumferential surface of the guide portion 42 has a limiting portion 43. The right end of the through hole 21 has a guide section 211. The diameter of the guide section 211 is larger than the diameter of the through hole 21. The limiting post 4 is slidably inserted into the through hole 21, and the guide portion 42 is slidably inserted into the guide section 211. The outer circumferential surface of the guide portion 42 is slidably engaged with the hole wall of the guide section 211. A right adjusting spring 103 is provided between the limiting post 4 and the right-end positioning post 5. The right end of the right adjusting spring 103 abuts against the positioning post 5, and the left end abuts against the limiting post 4. Under the action of the right adjusting spring 103, the end face of the limiting part 43 of the limiting post 4 abuts against the end face of the female valve core 2, so that the left end of the limiting post 4 is opposite to the end of the plug connector 31. An axial flow passage 32 is formed in the male valve core 3. The left end of the flow passage 32 is connected to the refrigeration inlet 11, and the right end is connected to the left end of the through hole 21. An axial flow passage 41 is formed on the limiting post 4. The right end of the flow passage 41 is connected to the heating inlet 12, and the left end is connected to the right end of the through hole 21.

[0048] The three throttling surfaces 314 on the left throttling section 312 are, from right to left, the intermediate cooling throttling surface, the rated cooling throttling surface, and the maximum cooling throttling surface. The three throttling surfaces 314 on the right throttling section 313 are, from left to right, the intermediate heating throttling surface, the rated heating throttling surface, and the maximum heating throttling surface. The two ends of the outer circumferential surface of the defrosting section 311 are connected to the adjacent throttling surfaces 314 through the guide cone surface 33. The axial width of the mating part 23 is smaller than the axial width of the throttling ring 22, and the mating part 23 is located at the right end of the inner circumferential surface of the throttling ring 22. The orifice at the left end of the throttling ring 22 is flared. This structure can guide and converge the refrigerant during defrosting and cooling, making the refrigerant flow smoother. Under the action of the left adjusting spring 101 and the positioning spring 105, when the male valve core 3 is not subjected to a large pressure difference of refrigerant, the mating surface 231 on the mating part 23 faces the outer peripheral surface of the defrosting part 311 and forms a defrosting channel 7. Therefore, during defrosting, a small flow of refrigerant enters from the refrigeration inlet 11, and flows through the first flow channel 32, the defrosting channel 7, and the second flow channel 41 in sequence before flowing out from the heating inlet 12, performing outdoor unit heating defrosting. Figure 2 As shown, during normal cooling, the refrigerant pressure difference is relatively large. The refrigerant flows in from the left-hand refrigeration inlet 11 and pushes the male valve core 3 to the right. The male valve core 3 moves to the right to achieve three flow rate levels of cooling modes, specifically:

[0049] Intermediate cooling mode: The male valve core 3 moves to the right and compresses the positioning spring 105. The end face of the plug 31 contacts the end face of the limit post 4. The right adjusting spring 103 is not compressed. The mating surface 231 is opposite to the intermediate cooling throttling surface.

[0050] Rated cooling mode: The male valve core 3 continues to move to the right, the plug 31 pushes the limit post 4, the right adjusting spring is compressed partly, and the mating surface 231 is opposite to the rated cooling throttling surface;

[0051] Maximum cooling mode: The male valve core 3 continues to move to the right, the plug 31 further pushes the limit post 4, the limit post 4 further compresses the right adjusting spring 103 or the limit post 4 abuts against the positioning post 5, and the mating surface 231 is opposite to the maximum cooling throttling surface.

[0052] Combination Figure 3 As shown, during normal heating, the refrigerant flows in from the heating inlet 12 on the right and pushes the male valve core 3 to the left. The male valve core 3 moves to the left to achieve three flow rate levels of heating modes, specifically:

[0053] Intermediate heating mode: The male valve core 3 moves to the left and compresses part of the left adjusting spring 101, and the mating surface 231 is opposite to the intermediate heating throttling surface;

[0054] Rated heating mode: The male valve core 3 continues to move to the left and further compresses the left adjusting spring 101, with the mating surface 231 facing the rated heating throttling surface;

[0055] Maximum heating mode: The male valve core 3 continues to move to the left, and the plug 31 further compresses the left adjusting spring 101, so that the mating surface 231 is opposite to the maximum heating throttling surface.

[0056] Example 2:

[0057] The structure of this self-balancing expansion valve is basically the same as that of Embodiment 1, the difference being that... Figure 5 As shown, a spacer 9 is also fixed axially inside the valve body 1. The outer diameter of the spacer 9 is slightly smaller than the inner diameter of the valve body 1. The left end of the spacer 9 is fixedly sleeved on the end of the positioning post 5 on the left end, and the right end is fixedly sleeved on the end of the female valve core 2. The male valve core 3, the left adjusting spring 101 and the positioning spring 105 are all set inside the spacer 9.

[0058] Example 3:

[0059] The structure of this self-balancing expansion valve is basically the same as that of Embodiment 2, the difference being that... Figure 6 , Figure 7As shown, a cylindrical limiting seat 6 is slidably provided between the limiting post 4 and the positioning post 5 at the right end. The right end of the right adjusting spring 103 abuts against the positioning post 5 at the right end, and the left end abuts against the limiting seat 6. The inner diameter of the left end of the inner hole of the limiting seat 6 is larger than the inner diameter of the right end, so that an abutting step surface is formed on the hole wall of the limiting seat 6. A right adjusting spring 2 104 is provided between the limiting seat 6 and the limiting post 4. The right adjusting spring 2 104 is located in the inner hole at the left end of the limiting seat 6, and the right end of the right adjusting spring 2 104 abuts against the abutting step surface, while the left end extends out of the inner hole of the limiting seat 6 and abuts against the limiting post 4. The starting elastic force of the right adjusting spring 103 is greater than the elastic force of the right adjusting spring 2 104 when it is compressed to the point where the limiting post 4 and the limiting seat 6 abut against each other. The connector 31 also includes two low-frequency sections 315 along the axial direction. One low-frequency section 315 is located between the left throttling section 312 and the defrosting section 311, and the other low-frequency section 315 is located between the right throttling section 313 and the defrosting section 311. The left throttling section 312 and the right throttling section 313 each have four throttling surfaces 314. The four throttling surfaces 314 on the left throttling section 312, from right to left, are: intermediate cooling throttling surface, rated cooling throttling surface, low-temperature rated cooling throttling surface, and maximum cooling throttling surface. The four throttling surfaces 314 on the right throttling section 313... The throttling surfaces 314, from left to right, are the intermediate heating throttling surface, the rated heating throttling surface, the low-temperature rated heating throttling surface, and the maximum heating throttling surface. The outer peripheral diameter of the low-frequency section 315 is smaller than the diameter of the adjacent throttling surfaces 314, and the outer peripheral diameter of the low-frequency section 315 is larger than the outer peripheral diameter of the defrosting section 311. Therefore, during cooling or heating, the mating surface 231 on the mating part 23 can sequentially align with the outer peripheral surface of the low-frequency section 315 and the four throttling surfaces 314, thereby forming five flow rate levels of cooling modes, specifically:

[0060] Low-temperature intermediate cooling mode: The male valve core 3 compresses the positioning spring 105 and moves to the right. The end face of the plug 31 contacts the end face of the limit post 4. The right adjustment spring 103 and the right adjustment spring 204 are not compressed. The mating surface 231 is opposite to the outer peripheral surface of the low-frequency part 315.

[0061] Intermediate cooling mode: The male valve core 3 continues to compress the positioning spring 105 and moves to the right. The plug 31 of the male valve core 3 pushes the limit post 4. The right adjusting spring 104 is partially compressed, but the limit post 4 has not yet contacted the limit seat 6, and the right adjusting spring 103 is not compressed.

[0062] Rated cooling mode: The male valve core 3 continues to compress the positioning spring 105 and move to the right. The plug 31 of the male valve core 3 continues to push the limit post 4. The right adjusting spring 103 is compressed until the male valve core 3 abuts against the limit seat 6. The right adjusting spring 103 is not compressed.

[0063] Low temperature rated cooling mode: The male valve core 3 continues to compress the positioning spring 105 and moves to the right. The plug 31 of the male valve core 3 continues to push the limit post 4. The limit post 4 pushes the limit seat 6. The right adjusting spring 103 is partially compressed.

[0064] Maximum cooling mode: The male valve core 3 continues to compress the positioning spring 105 and move to the right. The plug 31 of the male valve core 3 continues to push the limit post 4. The limit post 4 pushes the limit seat 6. The right adjusting spring 103 is further compressed.

[0065] The five flow rate heating modes are all controlled by the left regulating spring-101, specifically: low temperature intermediate heating mode, intermediate heating mode, rated heating mode, low temperature rated heating mode, and maximum heating mode.

[0066] Example 4:

[0067] The structure of this self-balancing expansion valve is basically the same as that of Embodiment 2, the difference being that... Figure 8 As shown, the limiting seat 6 is not located between the limiting post 4 and the right-end positioning post 5, but rather between the male valve core 3 and the left-end positioning post 5. The left end of the left adjusting spring 101 abuts against the left-end positioning post 5, and the right end abuts against the limiting seat 6. A left adjusting spring 2 102 is provided between the limiting seat 6 and the male valve core 3. The outer circumferential surface of the limiting seat 6 has an abutting step surface. The left adjusting spring 2 102 is sleeved on the limiting seat 6, with its left end abutting against the abutting step surface and its right end abutting against the male valve core 3. The starting elastic force of the left adjusting spring 101 is greater than the elastic force of the left adjusting spring 2 102 when it is compressed to the point where the male valve core 3 abuts against the limiting seat 6, thus forming five flow level heating modes, specifically:

[0068] Low temperature intermediate heating mode: The male valve core 3 moves to the left, and the left adjusting spring 102 is partially compressed, but the male valve core 3 has not yet contacted the limit seat 6, the left adjusting spring 101 is not compressed, and the mating surface 231 is opposite to the outer peripheral surface of the low frequency part 315.

[0069] Intermediate heating mode: The male valve core 3 continues to move to the left, and the left adjusting spring 102 is compressed until the male valve core 3 abuts against the limit seat 6, while the left adjusting spring 101 is not compressed;

[0070] Rated heating mode: The male valve core 3 continues to move to the left, the push limit seat 6 moves and compresses part of the left adjusting spring 101;

[0071] Low temperature customized heating mode: The male valve core 3 continues to move to the left, the push limit seat 6 continues to move and further compresses the left adjusting spring 101;

[0072] Maximum heating mode: The male valve core 3 continues to move to the left, the push limit seat 6 continues to move and further compresses the left adjusting spring 101.

[0073] Example 5:

[0074] The structure of this self-balancing expansion valve is basically the same as that of Embodiment 3, the difference being that... Figure 9 As shown, the male valve core 3 does not have a flow passage 32. Instead, a flow passage 13 is formed between the outer circumferential surface of the spacer 9 and the inner circumferential surface of the valve body 1. A through hole 52 is radially opened on the side wall of the positioning post 5. The inner end of the through hole 52 is connected to the through hole 51 of the positioning post 5, and the outer end is connected to the flow passage 13. A through hole 24 is radially opened on the side wall of the female valve core 2. The inner end of the through hole 24 is connected to the left end of the through hole 21 of the female valve core 2, and the outer end is connected to the flow passage 13.

[0075] Example 6:

[0076] The structure of this self-balancing expansion valve is basically the same as that of Embodiment 1, the difference being that... Figure 10 As shown, the connector 31 also includes two low-frequency sections 315 along the axial direction. One low-frequency section 315 is located between the left throttling section 312 and the defrosting section 311, and the other low-frequency section 315 is located between the right throttling section 313 and the defrosting section 311. The left throttling section 312 and the right throttling section 313 each have three throttling surfaces 314. The three throttling surfaces 314 on the left throttling section 312, from right to left, are the intermediate cooling throttling surface, the rated cooling throttling surface, and the maximum cooling throttling surface. The right throttling surface... The three throttling surfaces 314 on the flow section 313 are, from left to right, the intermediate heating throttling surface, the rated heating throttling surface, and the maximum heating throttling surface. The outer peripheral diameter of the low-frequency section 315 is smaller than the diameter of the adjacent throttling surface 314, and the outer peripheral diameter of the low-frequency section 315 is larger than the outer peripheral diameter of the defrosting section 311. Therefore, when the mating surface 231 on the mating section 23 is opposite to the outer peripheral surface of the low-frequency section 315 during cooling or heating, a low-temperature intermediate cooling mode or a low-temperature intermediate heating mode is formed.

[0077] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0078] Although this document frequently uses terms such as main valve body 1, cooling inlet 11, and heating inlet 12, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A self-balancing expansion valve comprising a tubular valve body (1), a female valve spool (2) fixed in the valve body (1), a male valve spool (3) slidably arranged in the valve body (1) and located at the left side of the female valve spool (2), and an elastic member acting on the male valve spool (3), the female valve spool (2) having an axial through hole (21), and the inner wall of the through hole (21) has a circumferential annular matching surface (231), characterized in that, The right end of the male valve core (3) has a plug (31) in the shape of a cylinder and inserted into the through hole (21), the plug (31) includes a defrosting part (311), a left throttling part (312) on the left side of the defrosting part (311), and a right throttling part (313) on the right side of the defrosting part (311) in the axial direction, the outer wall of the left throttling part (312) and the right throttling part (313) each has a plurality of annular throttling surfaces (314), the throttling surfaces (314) of the left throttling part (312) are arranged gradually smaller in diameter from right to left, the throttling surfaces (314) of the right throttling part (313) are arranged gradually smaller in diameter from left to right, the outer circumferential surface of the defrosting part (311) is smaller in diameter than the throttling surfaces (314), the outer circumferential surface of the defrosting part (311) is opposite to the matching surface (231) and forms a defrosting channel (7) under the action of the elastic member, when the male valve core (3) moves to either end and the outer circumferential surface of the defrosting part (311) is misaligned with the matching surface (231), the matching surface (231) can form a throttling channel (8) between the opposite throttling surfaces (314).

2. The self-balancing expansion valve according to claim 1, wherein The plug (31) further includes two low frequency parts (315) in the axial direction, one of the low frequency parts (315) is between the left throttling part (312) and the defrosting part (311), the other low frequency part (315) is between the right throttling part (313) and the defrosting part (311), the outer circumferential surface of the low frequency part (315) is smaller in diameter than the adjacent throttling surface (314), and the outer circumferential surface of the low frequency part (315) is larger in diameter than the outer circumferential surface of the defrosting part (311).

3. The self-balancing expansion valve according to claim 1, wherein The through hole (21) of the female valve core (2) has an annular throttling ring (22) on the inner wall in the circumferential direction, the inner wall of the throttling ring (22) has an annular matching part (23) in the circumferential direction, the matching part (23) is located at the right end of the inner hole of the throttling ring (22), the inner circumferential surface of the matching part (23) is the matching surface (231) mentioned above, and the axial width of the matching surface (231) is smaller than the axial width of the outer circumferential surface of the defrosting part (311).

4. Self-balancing expansion valve according to claim 1 or 2 or 3, characterized in that The elastic member includes a left adjusting spring one (101) and a positioning spring (105), the left adjusting spring one (101) acts on the left end of the male valve core (3), and the positioning spring (105) acts between the male valve core (3) and the female valve core (2), the outer circumferential surface of the defrosting part (311) is opposite to the matching surface (231) and forms a defrosting channel (7) under the action of the left adjusting spring one (101) and the positioning spring (105), when the male valve core (3) moves to the left and compresses the left adjusting spring one (101), the throttling surfaces (314) of the right throttling part (313) are opposite to the matching surface (231) and form a throttling channel (8), when the male valve core (3) moves to the right and compresses the positioning spring (105), the throttling surfaces (314) of the left throttling part (312) are opposite to the matching surface (231) and form a throttling channel (8).

5. The self-balancing expansion valve according to claim 4, wherein The valve body (1) is fixed with positioning column (5) at both ends, the left adjusting spring one (101) is arranged between the left end positioning column (5) and the male valve core (3), and the elastic member further comprises the right adjusting spring one (103), which is arranged between the right end positioning column (5) and the male valve core (3).

6. The self-balancing expansion valve according to claim 5, wherein The valve body (1) is further provided with a limiting column (4) slidingly arranged between the right end positioning column (5) and the female valve core (2), and the limiting column (4) is inserted into the through hole (21) of the female valve core (2) and opposite to the end of the plug (31), and the right adjusting spring one (103) is arranged between the right end positioning column (5) and the limiting column (4).

7. The self-balancing expansion valve according to claim 6, wherein The valve body (1) is further provided with a spacer (9) fixed axially, the left end of the spacer (9) is fixedly sleeved on the end of the left end positioning column (5), and the right end is fixedly sleeved on the end of the female valve core (2), and the male valve core (3), the left adjusting spring one (101) and the positioning spring (105) are arranged in the spacer (9).

8. The self-balancing expansion valve according to claim 6, wherein The limiting column (4) and the right end positioning column (5) are further provided with a cylindrical limiting seat (6) slidingly arranged between them, the right end of the right adjusting spring one (103) is abutted against the right end positioning column (5), and the left end is abutted against the limiting seat (6), the right adjusting spring two (104) is arranged between the limiting seat (6) and the limiting column (4), the right end of the right adjusting spring two (104) is abutted against the limiting seat (6), and the left end is abutted against the limiting column (4), the starting elastic force value of the right adjusting spring one (103) is greater than the elastic force value of the right adjusting spring two (104) when it is compressed to the abutting position of the limiting column (4) and the limiting seat (6).

9. The self-balancing expansion valve according to claim 6, wherein The male valve core (3) and the left end positioning column (5) are provided with a cylindrical limiting seat (6) slidingly arranged between them, the left end of the left adjusting spring one (101) is abutted against the left end positioning column (5), and the right end is abutted against the limiting seat (6), the left adjusting spring two (102) is arranged between the limiting seat (6) and the male valve core (3), the left end of the left adjusting spring two (102) is abutted against the limiting seat (6), and the right end is abutted against the male valve core (3), the starting elastic force value of the left adjusting spring one (101) is greater than the elastic force value of the left adjusting spring two (102) when it is compressed to the abutting position of the male valve core (3) and the limiting seat (6).

10. The self-balancing expansion valve according to claim 6, wherein The male valve core (3) is provided with a flow channel one (32) axially arranged, the left end of the flow channel one (32) is communicated with the left end port of the valve body (1), and the right end is communicated with the left end of the through hole (21), the limiting column (4) is provided with a flow channel two (41) axially arranged, the right end of the flow channel two (41) is communicated with the right end port of the valve body (1), and the left end is communicated with the right end of the through hole (21).

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