Electronic expansion valve, refrigerating system and automobile

Abstract

The utility model discloses an electronic expansion valve, a refrigerating system and an automobile, and the electronic expansion valve comprises a connecting assembly, a valve shell and a valve core assembly, the connecting assembly is provided with a valve port. The valve shell is connected with the end, away from the valve port, of the connecting assembly. The valve shell and the connecting assembly define a containing cavity. The valve element assembly is movably arranged on the connecting assembly and used for opening or closing the valve port. The valve element assembly comprises a valve needle, a first balance cavity is formed in the valve needle, a first communicating hole is formed in the valve needle, the first balance cavity communicates with the containing cavity through the first communicating hole, and the first balance cavity communicates with the exterior of the valve port. According to the electronic expansion valve, the problem that the valve opening performance is affected due to the fact that resistance borne by the electronic expansion valve is large when the electronic expansion valve is opened can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control components, in particular to an electronic expansion valve, a refrigeration system and a car. Background Art

[0002] The electronic expansion valve is an important component in the refrigeration system, which mainly plays the role of throttling, reducing pressure and regulating flow. In the related technology, the electronic expansion valve includes components such as a valve seat assembly, a nut assembly, a valve core assembly and a magnetic rotor assembly. When the electronic expansion valve is working, the magnetic rotor assembly is driven to rotate by the energized coil surrounding the outside of the valve housing, thereby driving the axial movement of the valve core assembly, and then controlling the opening or closing of the valve port, so as to achieve the role of throttling, reducing pressure and regulating flow. However, due to the unbalanced pressure inside and outside the valve, the pressure inside the valve is relatively large, and the electronic expansion valve encounters greater resistance when opening the valve, which affects the valve opening performance. Utility Model Content

[0003] The main purpose of the utility model is to provide an electronic expansion valve, aiming to solve the problem that the electronic expansion valve is subject to relatively large resistance when opening the valve, thereby affecting the valve opening performance.

[0004] To achieve the above-mentioned purpose, the utility model proposes an electronic expansion valve, which includes a connecting component, a valve shell and a valve core component; the connecting component has a valve port; the valve shell is connected to an end of the connecting component away from the valve port, and the valve shell and the connecting component enclose a accommodating chamber; the valve core component is movably arranged on the connecting component to open or close the valve port; the valve core component includes a valve needle, the valve needle has a first balancing chamber inside, the valve needle is provided with a first communicating hole, the first balancing chamber and the accommodating chamber are connected through the first communicating hole, and the first balancing chamber is connected to the outside of the valve port.

[0005] In one embodiment, the connecting assembly includes a mounting seat and a valve port seat, the opposite sides of the mounting seat are connected to form a positioning section, a guide section and a mounting section, the two ends of the guide section are respectively connected to the positioning section and the mounting section, the valve port is formed on the valve port seat, the valve port seat is arranged on the mounting section, and the valve needle extends into the guide section and cooperates with the guide section.

[0006] In one embodiment, the guide section is provided with a balancing groove, and the first communicating hole is communicated with the accommodating cavity through the balancing groove.

[0007] In one embodiment, the electronic expansion valve also includes a nut assembly, which is installed on the connecting assembly and cooperates with the valve core assembly. The nut assembly is provided with a second connecting hole, and a second balancing chamber is formed between the nut assembly, the connecting assembly and the valve core assembly, and the second balancing chamber is connected to the balancing groove; the first connecting hole connects the first balancing chamber and the balancing groove, and the second connecting hole connects the second balancing chamber and the accommodating chamber.

[0008] In one embodiment, a first step surface is formed between the positioning section and the guide section, and a second step surface is formed between the mounting section and the guide section; the balancing groove has relative notches and a groove bottom, the notch is located on the first step surface, and the groove bottom is located between the first step surface and the second step surface.

[0009] In one embodiment, when the valve needle closes the valve port, the first communicating hole is located between the notch and the groove bottom.

[0010] In one embodiment, the electronic expansion valve further includes a sealing ring, which is disposed on the mounting section and located between the second step surface and the valve seat.

[0011] In one embodiment, the inner diameter of the sealing ring is consistent with the diameter of the valve port.

[0012] In one embodiment, the cross-section of the sealing ring is any one of circular, rectangular, D-shaped, Y-shaped, or U-shaped, and / or the outer surface of the sealing ring is provided with a lubricating coating.

[0013] In one embodiment, the number of the first communicating holes is set to one, or the number of the first communicating holes is set to a plurality, and the plurality of first communicating holes are arranged at intervals along the circumference of the valve needle.

[0014] In one embodiment, the valve needle has a first end and a second end opposite to each other, the second end is arranged close to the valve port, and the valve needle has a first sealing section, and the first sealing section is tapered in a direction from the first end to the second end.

[0015] In one embodiment, the valve needle further has a second sealing segment connected to the first sealing segment, the second sealing segment is located on a side of the first sealing segment close to the valve port, and the second sealing segment is tapered from the first end to the second end.

[0016] In one embodiment, an angle α is formed between the first sealing section and the axis of the valve needle, and an angle β is formed between the second sealing section and the axis of the valve needle, satisfying α<β.

[0017] In one embodiment, the first balancing cavity includes a first cavity hole and a second cavity hole that are connected, the first connecting hole is arranged on the hole wall of the first cavity hole, the second cavity hole is opened in the second sealing section, and the aperture of the first cavity hole is larger than the aperture of the second cavity hole.

[0018] In one embodiment, the diameter of the first cavity hole is greater than or equal to 2 mm, and / or the diameter of the second cavity hole is greater than or equal to 0.5 mm.

[0019] In one embodiment, a protrusion is further provided on the outer periphery of the valve needle, the protrusion is connected to the first sealing section, and the outer diameter of the protrusion is larger than the diameter of the valve port.

[0020] In one embodiment, the caliber of the valve port ranges from 4 mm to 7 mm.

[0021] In one embodiment, the electronic expansion valve also includes a nut assembly, which is installed on the connecting assembly and cooperates with the valve core assembly. The nut assembly is provided with a second connecting hole, and a second balancing chamber is formed between the nut assembly, the connecting assembly and the valve core assembly. The first connecting hole connects the first balancing chamber and the second balancing chamber, and the second connecting hole connects the accommodating chamber and the second balancing chamber.

[0022] The utility model also proposes a refrigeration system, which includes the electronic expansion valve. The electronic expansion valve includes a connecting component, a valve shell and a valve core component; the connecting component has a valve port; the valve shell is connected to an end of the connecting component away from the valve port, and the valve shell and the connecting component enclose a receiving chamber; the valve core component is movably arranged on the connecting component to open or close the valve port; the valve core component includes a valve needle, the valve needle has a first balancing chamber inside, the valve needle is provided with a first communicating hole, the first balancing chamber and the receiving chamber are connected through the first communicating hole, and the first balancing chamber is connected to the outside of the valve port.

[0023] The utility model also proposes a car, the car includes the refrigeration system, and the refrigeration system includes the electronic expansion valve. The electronic expansion valve includes a connecting component, a valve shell and a valve core component; the connecting component has a valve port; the valve shell is connected to an end of the connecting component away from the valve port, and the valve shell and the connecting component enclose a receiving chamber; the valve core component is movably arranged on the connecting component to open or close the valve port; the valve core component includes a valve needle, the valve needle has a first balancing chamber inside, the valve needle is provided with a first communicating hole, the first balancing chamber and the receiving chamber are connected through the first communicating hole, and the first balancing chamber is connected to the outside of the valve port.

[0024] The electronic expansion valve of the utility model includes a connecting component, a valve shell and a valve core component; the connecting component has a valve port; the valve shell is connected to an end of the connecting component away from the valve port, and the valve shell and the connecting component enclose a receiving chamber; the valve core component is movably arranged on the connecting component to open or close the valve port; the valve core component includes a valve needle, the valve needle has a first balancing chamber inside, the valve needle is provided with a first connecting hole, the first balancing chamber and the receiving chamber are connected through the first connecting hole, and the first balancing chamber is connected with the outside of the valve port. In this way, the outside of the valve port is connected through the first balancing chamber, the first connecting hole and the receiving chamber, so that the pressure of the receiving chamber and the outside of the valve port is balanced. When the valve core component moves up and down, the pressure inside and outside the valve port is balanced, thereby improving the valve opening performance of the electronic expansion valve, ensuring that the valve needle can smoothly open the valve under relatively small resistance, reducing the valve opening voltage of the electronic expansion valve, and realizing miniaturization and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 This is a structural schematic diagram of an embodiment of the electronic expansion valve of the utility model;

[0027] Figure 2 for Figure 1 A schematic structural diagram of the electronic expansion valve from another perspective with the stator assembly removed;

[0028] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of the mounting seat of the utility model;

[0030] Figure 5 for Figure 4 A top view of the middle mounting seat;

[0031] Figure 6 for Figure 5 Sectional view along line II;

[0032] Figure 7 This is a structural schematic diagram of the valve seat of the utility model;

[0033] Figure 8 for Figure 7 A cross-sectional view of the middle valve seat;

[0034] Fig. 9 This is a schematic diagram of the structure of the valve needle of the utility model;

[0035] Fig.10 for Fig. 9 A cross-sectional view of the middle valve needle;

[0036] Fig.11 for Fig.10 The enlarged view of point B in the middle;

[0037] Fig.12 The figure is a schematic diagram of the structure of two different types of sealing rings of the utility model.

[0038] Description of Figure Numbers:

[0039]

[0040]

[0041] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0045] The utility model proposes an embodiment of an electronic expansion valve, which is an important component in a refrigeration system, and mainly plays the role of throttling, reducing pressure and regulating flow. In the related art, the electronic expansion valve includes components such as a valve seat assembly, a nut assembly, a valve core assembly and a magnetic rotor assembly. When the electronic expansion valve is working, the magnetic rotor assembly is driven to rotate by an energized coil surrounding the outside of the valve housing, thereby driving the valve core assembly to move axially, and then controlling the opening or closing of the valve port, so as to achieve the role of throttling, reducing pressure and regulating flow. However, due to the unbalanced pressure inside and outside the valve, the pressure inside the valve is relatively large, and the electronic expansion valve is subjected to relatively large resistance when opening the valve, which affects the valve opening performance. The electronic expansion valve proposed in the utility model is intended to solve the problem that the electronic expansion valve is subjected to relatively large resistance when opening the valve, which affects the valve opening performance.

[0046] The electronic expansion valve proposed in the utility model can be applied to a vehicle refrigeration system, and the fluid medium flowing through the electronic expansion valve is a refrigerant used for heat exchange in the vehicle refrigeration system. At this time, the electronic expansion valve is installed at the inlet of the evaporator of the vehicle refrigeration system. The electronic expansion valve serves as a dividing element between the high-pressure side and the low-pressure side of the vehicle refrigeration system, throttling and reducing the pressure of the high-pressure liquid refrigerant, thereby adjusting and controlling the dosage of the liquid refrigerant entering the evaporator, so that the dosage of the liquid refrigerant can meet the requirements of the external refrigeration load. Alternatively, the electronic expansion valve is applied to other types of refrigeration equipment, and the fluid medium flowing through the electronic expansion valve can also be other fluid media besides the refrigerant, as long as the electronic expansion valve can achieve throttling and reducing the pressure of the fluid medium, and there is no specific restriction on this.

[0047] See also Figures 1 to 3 , Figure 8In one embodiment of the utility model, the electronic expansion valve 10 includes a connecting component 100, a valve shell 200 and a valve core component 300; the connecting component 100 has a valve port 121; the valve shell 200 is connected to an end of the connecting component 100 away from the valve port 121, and the valve shell 200 and the connecting component 100 enclose a accommodating chamber 210; the valve core component 300 is movably arranged on the connecting component 100 to open or close the valve port 121; the valve core component 300 includes a valve needle 310, and the valve needle 310 has a first balancing chamber 311 inside, and the valve needle 310 is provided with a first communicating hole 312, the first balancing chamber 311 and the accommodating chamber 210 are communicated through the first communicating hole 312, and the first balancing chamber 311 is communicated with the outside of the valve port 121.

[0048] Specifically, the electronic expansion valve 10 also includes a valve seat (not shown in the figure), and the valve seat can be made of stainless steel, aluminum, or other materials, and there is no specific limitation on this. The shape of the valve seat can be cylindrical, square or other special-shaped. The connecting component 100 is installed on the valve seat, and the valve seat is provided with a first interface, a second interface and a valve cavity connecting the first interface and the second interface (not shown in the figure), and the first interface and the second interface are used to connect the pipeline. The connecting component 100 has a connecting port 122 and a valve port 121, and the connecting port 122 is connected to the first interface, and the valve port 121 is connected to the second interface.

[0049] When the electronic expansion valve 10 is in use, the fluid medium can enter from the first interface, flow through the communication port 122 and the valve port 121, and flow out from the second interface; conversely, the fluid medium can also enter from the second interface, flow through the valve port 121 and the communication port 122, and flow out from the first interface. That is, the fluid medium can flow in from either the first interface or the second interface, and flow out from the other. In this embodiment, the fluid medium flows in from the first interface and flows out from the second interface.

[0050] See also Figures 4 to 8, the interior of the connecting assembly 100 is hollow, and the valve core assembly 300 is movably arranged on the connecting assembly 100 to open or close the valve port 121. It can be understood that the interior of the connecting assembly 100 is used to guide the movement of the valve core assembly 300. The valve core assembly 300 includes a valve needle 310 and a valve stem 320 connected to each other. The valve needle 310 and the valve stem 320 can be directly connected or indirectly connected together through other components, and there is no specific limitation on this. Driven by the power source, the valve stem 320 can drive the valve needle 310 to move, thereby approaching or moving away from the valve port 121. When the valve needle 310 is tightly matched with the valve port 121, the valve port 121 is in a closed state, thereby blocking the fluid medium in the electronic expansion valve 10 from being discharged outward through the valve port 121; when the valve head is separated from the valve port 121, the valve port 121 is in an open state, and the fluid medium in the electronic expansion valve 10 can be discharged outward through the valve port 121.

[0051] See also Figure 2 , Figure 8 and Fig. 9 The valve needle 310 has a first balancing chamber 311 inside, and the valve needle 310 is provided with a first communicating hole 312. The first communicating hole 312 is opened in the chamber wall of the first balancing chamber 311, and the first balancing chamber 311 and the accommodating chamber 210 are communicated through the first communicating hole 312. At the same time, the first balancing chamber 311 is also communicated with the outside of the valve port 121, so that the outside of the valve port 121 is communicated with the accommodating chamber 210 through the first balancing chamber 311, the first communicating hole 312, so that the pressure of the accommodating chamber 210 and the outside of the valve port 121 are balanced. When the valve core assembly 300 moves up and down, the pressure inside and outside the valve port 121 is balanced, thereby improving the valve opening performance of the electronic expansion valve 10, ensuring that the valve needle 310 can open the valve smoothly under relatively small resistance, reducing the valve opening voltage of the electronic expansion valve 10, and realizing miniaturization and lightness.

[0052] The electronic expansion valve 10 of the utility model comprises a connection assembly 100, a valve housing 200 and a valve core assembly 300; the connection assembly 100 has a valve port 121; the valve housing 200 is connected to an end of the connection assembly 100 away from the valve port 121, and the valve housing 200 and the connection assembly 100 enclose a receiving chamber 210; the valve core assembly 300 is movably arranged on the connection assembly 100 to open or close the valve port 121; the valve core assembly 300 comprises a valve needle 310, the valve needle 310 has a first balancing chamber 311 inside, the valve needle 310 is provided with a first communicating hole 312, the first balancing chamber 311 and the receiving chamber 210 are communicated through the first communicating hole 312, and the first balancing chamber 311 is communicated with the outside of the valve port 121. In this way, the outside of the valve port 121 is communicated with the receiving chamber 210 through the first balancing chamber 311, the first communicating hole 312 and the receiving chamber 210, so that the pressure outside the receiving chamber 210 and the valve port 121 is balanced. When the valve core assembly 300 moves up and down, the pressure inside and outside the valve port 121 remains balanced, thereby improving the valve opening performance of the electronic expansion valve 10, ensuring that the valve needle 310 can open the valve smoothly under relatively small resistance, reducing the valve opening voltage of the electronic expansion valve 10, and achieving miniaturization and lightweight.

[0053] In one embodiment, see Figures 3 to 8 The connecting assembly 100 includes a mounting seat 110 and a valve port seat 120. The opposite sides of the mounting seat 110 are connected to form a positioning section 111, a guide section 112 and a mounting section 113. The two ends of the guide section 112 are respectively connected to the positioning section 111 and the mounting section 113. The valve port 121 is formed on the valve port seat 120. The valve port seat 120 is arranged on the mounting section 113. The valve needle 310 extends into the guide section 112 and cooperates with the guide section 112.

[0054] Specifically, the connection assembly 100 includes a mounting seat 110 and a valve seat 120. The valve seat 120 and the mounting seat 110 are assembled together. Of course, in other embodiments, the mounting seat 110 and the valve seat 120 can also be set as one component, and there is no specific limitation on this. The two opposite sides of the mounting seat 110 are connected, and the inner wall surface of the through-connection sequentially forms a positioning section 111, a guide section 112 and a mounting section 113. The valve port 121 and the communication port 122 are both formed on the valve seat 120. The valve seat 120 is generally arranged in a hollow columnar shape. The valve port 121 is located at one end of the length direction of the valve seat 120. The communication port 122 is formed on the peripheral wall of the valve seat 120. The number of the communication ports 122 can be set to multiple, and the multiple communication ports 122 are arranged at intervals along the circumference of the valve seat 120. The number of the communication ports 122 can be 2, 3 or 4.

[0055] See also Figure 6It should be noted that the positioning section 111, the guide section 112 and the mounting section 113 are formed by the two opposite sides of the mounting seat 110. The positioning section 111 can be understood as the groove wall of the groove on one side of the mounting seat 110, the mounting section 113 is the groove wall of the groove on the other side of the mounting seat 110, and the guide section 112 is the hole wall that passes through the two groove bottoms 112a2 to form a through hole. The valve seat 120 is arranged in the mounting section 113, and the valve needle 310 extends into the guide section 112 and cooperates with the guide section 112, and the valve needle 310 also extends into the hollow valve seat 120, so as to move up and down to realize the function of opening or closing the valve port 121.

[0056] See also Figures 3 to 6 In one embodiment, the guide section 112 is provided with a balancing groove 112a, and the first communicating hole 312 is communicated with the accommodating chamber 210 through the balancing groove 112a. Specifically, the valve needle 310 extends into the guide section 112 and cooperates with the guide section 112, and the guide section 112 guides the valve needle 310. At the same time, the guide section 112 is provided with a balancing groove 112a, and the balancing groove 112a is a groove arranged in the guide section 112. The first communicating hole 312 is communicated with the accommodating chamber 210 through the balancing groove 112a, that is, the position of the first communicating hole 312 can correspond to the balancing groove 112a. In this way, the length of the mounting seat 110 can be shortened, and the length of the valve needle 310 can be shortened at the same time, thereby further shortening the axial length of the electronic expansion valve 10, realizing the miniaturization of the electronic expansion valve 10, and further reducing the production cost.

[0057] See also Figures 1 to 3 In one embodiment, the electronic expansion valve 10 also includes a nut assembly 400, which is installed on the connecting assembly 100 and cooperates with the valve core assembly 300. The nut assembly 400 is provided with a second connecting hole 410. A second balancing chamber 500 is formed between the nut assembly 400, the connecting assembly 100 and the valve core assembly 300. The second balancing chamber 500 is connected to the balancing groove 112a; the first connecting hole 312 connects the first balancing chamber 311 and the balancing groove 112a, and the second connecting hole 410 connects the second balancing chamber 500 and the accommodating chamber 210.

[0058] Specifically, the nut assembly 400 is fixedly mounted on the side of the mounting seat 110 away from the valve port seat 120, the nut assembly 400 has an internal thread, the valve stem 320 has an external thread, the nut assembly 400 and the valve stem 320 are threadedly matched, the valve stem 320 and the valve needle 310 are connected together, when the valve stem 320 rotates under the drive of the power source, the valve stem 320 can move up and down relative to the nut assembly 400, and the valve needle 310 moves up and down under the drive of the valve stem 320, so as to approach or move away from the valve port 121. The valve housing 200 is sleeved outside the nut assembly 400 and the valve core assembly 300, and the valve housing 200 is roughly cylindrical in design, and the valve housing 200 and the mounting seat 110 can be fixed by welding. The accommodating chamber 210 of the valve housing 200 further accommodates a rotor assembly 700 , which is connected to the valve stem 320 . The valve stem 320 rotates driven by the rotor assembly 700 , thereby driving the valve needle 310 to move up and down in the connecting seat.

[0059] See also Figure 3 The nut assembly 400 is provided with a second connecting hole 410, and a second balancing chamber 500 is formed between the nut assembly 400, the connecting assembly 100 and the valve core assembly 300. The second balancing chamber 500 is connected to the balancing groove 112a, and the first connecting hole 312 is connected to the first balancing chamber 311 and the balancing groove 112a, and the second connecting hole 410 is connected to the second balancing chamber 500 and the accommodating chamber 210. That is to say, the external environment of the valve port 121 is connected to the accommodating chamber 210 through the first balancing chamber 311, the first connecting hole 312, the balancing groove 112a, the second balancing chamber 500, and the second connecting hole 410 in sequence, so as to ensure that the internal and external pressures of the valve port 121 remain balanced, thereby improving the valve opening performance of the electronic expansion valve 10.

[0060] In another embodiment, the electronic expansion valve 10 also includes a nut assembly 400, which is installed on the connecting assembly 100 and cooperates with the valve core assembly 300. The nut assembly 400 is provided with a second connecting hole 410. A second balancing chamber 500 is formed between the nut assembly 400, the connecting assembly 100 and the valve core assembly 300. The first connecting hole 312 connects the first balancing chamber 311 and the second balancing chamber 500. The second connecting hole 410 connects the accommodating chamber 210 and the second balancing chamber 500.

[0061] As described in the previous embodiment, the nut assembly 400 is fixedly mounted on the side of the mounting seat 110 away from the valve port seat 120, the nut assembly 400 has an internal thread, the valve stem 320 has an external thread, the nut assembly 400 and the valve stem 320 are threadedly matched, the valve stem 320 and the valve needle 310 are connected together, when the valve stem 320 rotates under the drive of the power source, the valve stem 320 can move up and down relative to the nut assembly 400, and the valve needle 310 moves up and down driven by the valve stem 320, so as to approach or move away from the valve port 121. The valve housing 200 is sleeved outside the nut assembly 400 and the valve core assembly 300, and the valve housing 200 is roughly cylindrical in design, and the valve housing 200 and the mounting seat 110 can be fixed by welding. The accommodating chamber 210 of the valve housing 200 further accommodates a rotor assembly 700 , which is connected to the valve stem 320 . The valve stem 320 rotates driven by the rotor assembly 700 , thereby driving the valve needle 310 to move up and down in the connecting seat.

[0062] The nut assembly 400 is provided with a second connecting hole 410, and a second balancing chamber 500 is formed between the nut assembly 400, the connecting assembly 100 and the valve core assembly 300. In this embodiment, the guide section 112 is not provided with a balancing groove 112a, and the external environment of the valve port 121 is connected to the accommodating chamber 210 through the first balancing chamber 311, the first connecting hole 312, the second balancing chamber 500, and the second connecting hole 410 in sequence to ensure that the internal and external pressures of the valve port 121 remain balanced, thereby improving the valve opening performance of the electronic expansion valve 10.

[0063] See also Figure 6 In one embodiment, a first step surface 114 is formed between the positioning section 111 and the guide section 112, and a second step surface 115 is formed between the mounting section 113 and the guide section 112; the balancing groove 112a has a relative notch 112a1 and a groove bottom 112a2, the notch 112a1 is located on the first step surface 114, and the groove bottom 112a2 is located between the first step surface 114 and the second step surface 115.

[0064] Specifically, the balancing groove 112a has a notch 112a1 and a groove bottom 112a2 opposite to each other, the notch 112a1 is located on the first step surface 114, and the notch 112a1 is connected to the space formed by the positioning section 111, so as to be connected to the accommodating cavity 210 through the second balancing cavity 500 and the second communicating hole 410. The groove bottom 112a2 is located between the first step surface 114 and the second step surface 115, that is, the groove bottom 112a2 is not connected to the space formed by the mounting section 113.

[0065] See also Figure 3 and Figure 6Furthermore, when the valve needle 310 closes the valve port 121, the first communication hole 312 is located between the notch 112a1 and the groove bottom 112a2. This arrangement ensures that the first communication hole 312 can always be connected to the balance groove 112a, and the movement of the valve needle 310 will not affect the communication between the inside and outside of the valve port 121, thereby further ensuring that the pressure inside and outside the valve port 121 can always be balanced.

[0066] See also Figure 3 and Fig.12 It is worth mentioning that the electronic expansion valve 10 also includes a sealing ring 600, which is arranged in the installation section 113 and is located between the second step surface 115 and the valve seat 120. Specifically, the sealing ring 600 is arranged in the installation section 113 and is located between the first step surface 114 and the valve seat 120. The sealing ring 600 mainly plays a sealing role to prevent the refrigerant in a high-pressure state from flowing into the accommodating chamber 210 through the gap between the valve needle 310 and the guide section 112, thereby ensuring that the pressure inside and outside the valve port 121 can always be balanced. At the same time, since the groove bottom 112a2 is located between the first step surface 114 and the second step surface 115, and the groove bottom 112a2 is not connected to the space formed by the installation section 113, and the sealing ring 600 is arranged in the installation section 113, specifically close to the second step surface 115, it is ensured that the relative forces on the two sides of the sealing ring 600 are balanced and will not deform, thereby further ensuring the sealing performance of the sealing ring 600.

[0067] Furthermore, the inner diameter of the sealing ring 600 is consistent with the diameter of the valve port 121, so that the sealing ring 600 can be sealed with the outer wall surface of the valve needle 310, achieving a better sealing effect.

[0068] Furthermore, the cross section of the sealing ring 600 is any one of circular, rectangular, D-shaped, Y-shaped, or U-shaped, and / or the outer surface of the sealing ring 600 is provided with a lubricating coating. Specifically, the sealing ring 600 can adopt various types of sealing rings 600, and the cross section of the sealing ring 600 can be any one of circular, rectangular, D-shaped, Y-shaped, or U-shaped, as long as it has a good sealing effect. In this embodiment, the sealing ring 600 is preferably a D-shaped sealing ring 600. Alternatively, a lubricating coating can also be provided on the outer surface of the sealing ring 600 to prevent the sealing ring 600 from being worn when the valve needle 310 moves up and down for a long time, thereby affecting the sealing effect of the sealing ring 600.

[0069] It should be noted that the material of the sealing ring 600 is silicone or rubber. Since the valve needle 310 needs to move back and forth, in order to prevent the sealing ring 600 from being worn, a wear-resistant layer can be set on the outer side of the sealing ring 600, so that the wear-resistant layer contacts the guide section 112, so that when the valve core assembly 300 moves, it will not rub against the sealing ring 600, so as to ensure the sealing performance of the sealing ring 600. There are many materials for the wear-resistant layer. In one embodiment, the material of the wear-resistant layer is polytetrafluoroethylene. Polytetrafluoroethylene (PTFE for short) is a high molecular polymer obtained by polymerization of tetrafluoroethylene as a monomer, and has excellent heat resistance and cold resistance. The friction coefficient of polytetrafluoroethylene is extremely low, which plays a lubricating role, thereby reducing the friction resistance between the guide section 112 and the sealing ring 600, so as to avoid the sealing ring 600 and the guide section 112 from being damaged by friction, thereby increasing the service life of the sealing ring 600.

[0070] See also Figure 3 and Fig. 9 In one embodiment, the number of the first communication holes 312 is set to 1, or the number of the first communication holes 312 is set to multiple, and the multiple first communication holes 312 are arranged at intervals along the circumference of the valve needle 310. Preferably, the number of the first communication holes 312 is set to multiple, and the number of the first communication holes 312 can be 1, 2, 3 or 4. In this embodiment, the number of the first communication holes 312 is set to 2, and two sealing rings 600 are symmetrically opened on the peripheral wall of the valve needle 310.

[0071] See also Fig. 9 and Fig.10 In one embodiment, the valve needle 310 has a first end 310a and a second end 310b opposite to each other, and the second end 310b is arranged close to the valve port 121. The valve needle 310 has a first sealing section 313, and the first sealing section 313 is tapered in the direction from the first end 310a to the second end 310b.

[0072] Specifically, the valve needle 310 has a first end 310a and a second end 310b along its length direction, and the second end 310b is an end used to open or close the valve port 121. The second end 310b of the valve needle 310 is provided with a first sealing section 313. In the direction from the first end 310a to the second end 310b, the first sealing section 313 is tapered. The tapered first sealing section 313 is used to adjust the flow rate of the refrigerant passing through the electronic expansion valve 10.

[0073] Please continue reading Fig. 9 and Fig.10Furthermore, the valve needle 310 also has a second sealing section 314 connected to the first sealing section 313. The second sealing section 314 is located on the side of the first sealing section 313 close to the valve port 121. In the direction from the first end 310a to the second end 310b, the second sealing section 314 is gradually reduced. Specifically, on the basis of the first sealing section 313, a second sealing section 314 can also be provided. Through the action of the first sealing section 313 and the second sealing section 314, the flow of the refrigerant passing through the electronic expansion valve 10 is adjusted.

[0074] It is understandable that the first sealing section 313 and the second sealing section 314 are both arranged to be tapered in the direction from the first end 310a to the second end 310b. When the valve needle 310 switches from the state of closing the valve port 121 to the open state, the refrigerant will flow out through the gap between the first sealing section 313 and the valve port 121. The tapered first sealing section 313 can control the size of the gap between the valve needle 310 and the valve port 121, thereby playing a role in regulating the flow. Similarly, the second sealing section 314 is arranged on the basis of the first sealing section 313. The tapered second sealing section 314 can control the size of the gap between the valve needle 310 and the valve port 121, thereby playing a role in regulating the flow.

[0075] See also Fig.11 Furthermore, an angle α is formed between the first sealing section 313 and the axis of the valve needle 310, and an angle β is formed between the second sealing section 314 and the axis of the valve needle 310, satisfying α<β. With such a configuration, in the radial direction of the valve needle 310, when the first sealing section 313 of the valve needle 310 and the edge of the valve port 121 coincide, the flow rate of the refrigerant passing through the electronic expansion valve 10 is relatively small, and when the second sealing section 314 of the valve needle 310 and the edge of the valve port 121 coincide, the flow rate of the refrigerant passing through the electronic expansion valve 10 is greater than the flow rate when the first sealing section 313 of the valve needle 310 and the edge of the valve port 121 coincide, the first sealing section 313 and the second sealing section 314 can meet the requirements of the electronic expansion valve 10 for adjusting different flow rates.

[0076] See also Figure 3 and Fig.11 In one embodiment, the first balancing chamber 311 includes a first cavity hole 311a and a second cavity hole 311b that are connected to each other. The first connecting hole 312 is arranged on the hole wall of the first cavity hole 311a. The second cavity hole 311b is opened in the second sealing section 314. The aperture of the first cavity hole 311a is larger than the aperture of the second cavity hole 311b.

[0077] Specifically, the first communication hole 312 is disposed on the hole wall of the first cavity hole 311a, and the second cavity hole 311b is opened in the second sealing section 314, and the second cavity hole 311b is directly connected to the external environment of the valve port 121. Since the second sealing section 314 is gradually reduced in the direction from the first end 310a to the second end 310b, the aperture of the second cavity hole 311b is smaller than the aperture of the first cavity hole 311a.

[0078] Further, the aperture of the first cavity hole 311a is greater than or equal to 2 mm, and / or the aperture of the second cavity hole 311b is greater than or equal to 0.5 mm. Specifically, the aperture of the first cavity hole 311a is set to be greater than or equal to 2 mm, or the aperture of the second cavity hole 311b is set to be greater than or equal to 0.5 mm, or the aperture of the first cavity hole 311a is set to be greater than or equal to 2 mm, and the aperture of the second cavity hole 311b is set to be greater than or equal to 0.5 mm. Setting the aperture of the first cavity hole 311a to be greater than or equal to 2 mm and the aperture of the second cavity hole 311b to be greater than or equal to 0.5 mm facilitates the production of the first cavity hole 311a and the second cavity hole 311b, and can also achieve a better balancing effect on the pressure balance inside and outside the valve port 121. The aperture of the first cavity hole 311a can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm. The aperture of the second cavity hole 311b can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm.

[0079] See also Fig.10 and Fig.11 In one embodiment, a protrusion 315 is further provided on the periphery of the valve needle 310, the protrusion 315 is connected to the first sealing section 313, and the outer diameter of the protrusion 315 is larger than the caliber of the valve port 121. Specifically, a protrusion 315 is further provided on the periphery of the valve needle 310, the protrusion 315 is provided at the second end 310b of the valve needle 310, and the protrusion 315 is connected to the first sealing section 313. The outer diameter of the main body of the valve needle 310 is substantially consistent with the inner diameter of the main body, while the outer diameter of the protrusion 315 is larger than the caliber of the valve port 121. When the valve needle 310 closes the valve port 121, the protrusion 315 larger than the caliber of the valve port 121 can play a better blocking effect, preventing the liquid refrigerant from flowing from the connecting port 122 to the valve port 121 and flowing out, thereby greatly improving the closing effect of the valve needle 310 at the valve port 121.

[0080] In one embodiment, the caliber range of the valve port 121 is 4 mm-7 mm. Specifically, the caliber of the valve port 121 is limited to between 4 mm and 7 mm, preferably between 4.5 mm and 6.5 mm. The caliber of the valve port 121 can be 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5.0 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6.0 mm, 6.5 mm, 7 mm.

[0081] See also Figure 1 In one embodiment, the electronic expansion valve 10 further includes a stator assembly 800 , and the stator assembly 800 is sleeved on the valve housing 200 to provide power for the movement of the valve core assembly 300 .

[0082] The working principle of the electronic expansion valve 10 of the present utility model is as follows:

[0083] When the stator assembly 800 of the electronic expansion valve 10 is energized, a magnetic field is generated, and the rotor assembly 700 made of magnetic material rotates under the drive of the magnetic field. The rotor assembly 700 is fixedly connected to the valve stem 320. The rotation of the rotor assembly 700 drives the valve stem 320 to rotate, and a threaded matching relationship is formed between the valve stem 320 and the nut assembly 400. The nut assembly 400 is fixedly arranged on the mounting seat 110. Therefore, the rotation of the valve stem 320 relative to the nut assembly 400 will drive the valve stem 320 to move up and down relative to the nut assembly 400, thereby realizing the working process in which the stator assembly 800 drives the rotor assembly 700 to move, and the rotor assembly 700 then drives the valve core assembly 300 to move; the valve needle 310 moves toward the valve port 121 under the drive of the valve stem 320. When the valve needle 310 blocks the valve port 121, the electronic expansion valve 10 is closed; when the valve needle 310 releases the blockage of the valve port 121, the electronic expansion valve 10 is opened. Since the opening diameter of the channel in the electronic expansion valve 10 is relatively small, the flow rate of the fluid medium is reduced, thereby realizing the throttling and pressure reduction process of the fluid medium by the electronic expansion valve 10 .

[0084] The utility model also provides a refrigeration system, which includes the above-mentioned electronic expansion valve. The specific structure of the electronic expansion valve refers to the above-mentioned embodiment. Since the refrigeration system adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0085] The utility model also provides a car, the car includes the above refrigeration system. The refrigeration system includes the above electronic expansion valve, the specific structure of the electronic expansion valve refers to the above embodiment, since the car adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0086] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: The electronic expansion valve comprises: A connection assembly having a valve port; a valve housing connected to an end of the connecting assembly away from the valve port, the valve housing and the connecting assembly enclosing a receiving chamber; and A valve core assembly is movably arranged on the connecting assembly to open or close the valve port; the valve core assembly includes a valve needle, the valve needle has a first balancing chamber inside, the valve needle is provided with a first communicating hole, the first balancing chamber and the accommodating chamber are communicated through the first communicating hole, and the first balancing chamber is communicated with the outside of the valve port; The connecting assembly includes a mounting seat and a valve port seat, the two opposite sides of the mounting seat are connected to form a positioning section, a guide section and a mounting section, the two ends of the guide section are respectively connected to the positioning section and the mounting section, the valve port is formed at the valve port seat, the valve port seat is arranged at the mounting section, the valve needle extends into the guide section and cooperates with the guide section; The guide section is provided with a balancing groove, and the first communicating hole is communicated with the accommodating cavity through the balancing groove.

2. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve also includes a nut assembly, which is installed on the connecting assembly and cooperates with the valve core assembly. The nut assembly is provided with a second communicating hole, and a second balancing chamber is formed between the nut assembly, the connecting assembly and the valve core assembly. The second balancing chamber is communicated with the balancing groove; the first communicating hole communicates with the first balancing chamber and the balancing groove, and the second communicating hole communicates with the second balancing chamber and the accommodating chamber.

3. The electronic expansion valve according to claim 1, characterized in that: A first step surface is formed between the positioning section and the guide section, and a second step surface is formed between the mounting section and the guide section; the balancing groove has a relative notch and a groove bottom, the notch is located on the first step surface, and the groove bottom is located between the first step surface and the second step surface.

4. The electronic expansion valve according to claim 3, characterized in that: When the valve needle closes the valve port, the first communication hole is located between the notch and the groove bottom.

5. The electronic expansion valve according to claim 3, characterized in that: The electronic expansion valve further comprises a sealing ring, which is arranged on the installation section and located between the second step surface and the valve port seat.

6. The electronic expansion valve according to claim 5, characterized in that: The inner diameter of the sealing ring is consistent with the caliber of the valve port.

7. The electronic expansion valve according to claim 5, characterized in that: The cross section of the sealing ring is any one of circular, rectangular, D-shaped, Y-shaped, or U-shaped, and / or the outer surface of the sealing ring is provided with a lubricating coating.

8. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The number of the first communicating holes is set to one, or the number of the first communicating holes is set to a plurality, and the plurality of first communicating holes are arranged at intervals along the circumferential direction of the valve needle.

9. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The valve needle has a first end and a second end opposite to each other, the second end is arranged close to the valve port, and the valve needle has a first sealing section, and the first sealing section is arranged to be tapered in the direction from the first end to the second end.

10. The electronic expansion valve according to claim 9, characterized in that: The valve needle also has a second sealing section connected to the first sealing section. The second sealing section is located on a side of the first sealing section close to the valve port. In the direction from the first end to the second end, the second sealing section is tapered.

11. The electronic expansion valve according to claim 10, characterized in that: An angle α is formed between the first sealing section and the axis of the valve needle, and an angle β is formed between the second sealing section and the axis of the valve needle, satisfying α<β.

12. The electronic expansion valve according to claim 10, characterized in that: The first balancing cavity includes a first cavity hole and a second cavity hole which are connected. The first connecting hole is arranged on the hole wall of the first cavity hole. The second cavity hole is opened in the second sealing section. The aperture of the first cavity hole is larger than the aperture of the second cavity hole.

13. The electronic expansion valve according to claim 12, characterized in that: The diameter of the first cavity hole is greater than or equal to 2 mm, and / or the diameter of the second cavity hole is greater than or equal to 0.5 mm.

14. The electronic expansion valve according to claim 9, characterized in that: A protrusion is also provided on the outer periphery of the valve needle, the protrusion is connected to the first sealing section, and the outer diameter of the protrusion is larger than the diameter of the valve port.

15. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The caliber range of the valve port is 4mm-7mm.

16. The electronic expansion valve according to any one of claims 1 to 7, characterized in that: The electronic expansion valve also includes a nut assembly, which is installed on the connecting assembly and cooperates with the valve core assembly. The nut assembly is provided with a second communicating hole, and a second balancing chamber is formed between the nut assembly, the connecting assembly and the valve core assembly. The first communicating hole connects the first balancing chamber and the second balancing chamber, and the second communicating hole connects the accommodating chamber and the second balancing chamber.

17. A refrigeration system, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 1 to 16.

18. A car, characterized in that: Comprising the refrigeration system of claim 17.

Images