Electronic expansion valve, refrigerating system and automobile

Abstract

The invention 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 when the electronic expansion valve is opened, the resistance is large, and the valve opening performance is affected can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid control components, in particular to an electronic expansion valve, a refrigeration system and a vehicle. BACKGROUND

[0002] The electronic expansion valve is an important component in the refrigeration system, mainly playing the role of throttling and regulating flow. In the related art, the electronic expansion valve includes a valve seat assembly, a nut assembly, a valve core assembly and a magnetic rotor assembly. When the electronic expansion valve works, the magnetic rotor assembly is driven to rotate by the energized coil around 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 realize the role of throttling and regulating flow. However, due to the imbalance of the pressure inside and outside the valve, the pressure inside the valve is larger, and the electronic expansion valve has a large resistance when opening the valve, which affects the opening performance. SUMMARY

[0003] The main purpose of the present application is to provide an electronic expansion valve, which aims to solve the problem that the electronic expansion valve has a large resistance when opening the valve, which affects the opening performance.

[0004] To achieve the above-mentioned purpose, the electronic expansion valve provided by the present application comprises a connecting assembly, a valve housing and a valve core assembly; the connecting assembly has a valve port; the valve housing is connected with one end of the connecting assembly away from the valve port, and the valve housing and the connecting assembly form an accommodating cavity; the valve core assembly is movably arranged in the connecting assembly to open or close the valve port; the valve core assembly comprises a valve needle, the valve needle has a first balance cavity inside, the valve needle is provided with a first communication hole, the first balance cavity and the accommodating cavity are communicated through the first communication hole, and the first balance cavity is communicated with the outside of the valve port.

[0005] In an embodiment, the connecting assembly comprises a mounting seat and a valve port seat, opposite sides of the mounting seat are through and form a positioning section, a guide section and a mounting section, two ends of the guide section are connected with the positioning section and the mounting section respectively, the valve port is formed in the valve port seat, the valve port seat is arranged in the mounting section, and the valve needle extends into the guide section and is guided and matched with the guide section.

[0006] In an embodiment, the guide section is provided with a balance groove, and the first communication hole is communicated with the accommodating cavity through the balance groove.

[0007] In an embodiment, the electronic expansion valve further comprises a nut assembly, which is mounted to the connecting assembly and cooperates with the valve core assembly, the nut assembly is provided with a second communication hole, a second balance cavity is formed between the nut assembly, the connecting assembly and the valve core assembly, and the second balance cavity is communicated with the balance groove; the first communication hole communicates the first balance cavity with the balance groove, and the second communication hole communicates the second balance cavity with the containing cavity.

[0008] In an 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 balance groove is provided with opposite groove openings and a groove bottom, the groove openings are located at the first step surface, and the groove bottom is located between the first step surface and the second step surface.

[0009] In an embodiment, when the valve needle closes the valve port, the first communication hole is located between the groove openings and the groove bottom.

[0010] In an embodiment, the electronic expansion valve further comprises a sealing ring, which is arranged on the mounting section and located between the second step surface and the valve port seat.

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

[0012] In an embodiment, the cross section of the sealing ring is any one of a circle, a rectangle, a D shape, a Y shape or a U shape, and / or the outer surface of the sealing ring is provided with a lubricating coating.

[0013] In an embodiment, the number of the first communication holes is one, or the number of the first communication holes is multiple, and the multiple first communication holes are arranged in a circumferential direction of the valve needle.

[0014] In an embodiment, the valve needle is provided with opposite first and second ends, the second end is arranged close to the valve port, and the valve needle is provided with a first sealing section, which is arranged in a tapered manner in a direction from the first end to the second end.

[0015] In an embodiment, the valve needle is further provided with 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, and the second sealing section is arranged in a tapered manner in a direction from the first end to the second end.

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

[0017] In an embodiment, the first balance cavity comprises a first cavity hole and a second cavity hole in communication, the first communication hole is arranged on the hole wall of the first cavity hole, the second cavity hole is arranged on the second sealing section, and the hole diameter of the first cavity hole is greater than the hole diameter of the second cavity hole.

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

[0019] In an embodiment, the outer periphery of the valve needle is further provided with a protruding part, the protruding part is connected with the first sealing section, and the outer diameter of the protruding part is greater than the hole diameter of the valve port.

[0020] In an embodiment, the hole diameter of the valve port ranges from 4 mm to 7 mm.

[0021] In an embodiment, the electronic expansion valve further comprises a nut assembly, the nut assembly is mounted on the connecting assembly and cooperates with the valve core assembly, the nut assembly is provided with a second communication hole, a second balance cavity is formed between the nut assembly, the connecting assembly and the valve core assembly, the first communication hole communicates the first balance cavity and the second balance cavity, and the second communication hole communicates the containing cavity and the second balance cavity.

[0022] The application further provides a refrigeration system comprising the electronic expansion valve. The electronic expansion valve comprises a connecting assembly, a valve shell and a valve core assembly; the connecting assembly has a valve port; the valve shell is connected with the connecting assembly away from the valve port, and the valve shell and the connecting assembly enclose a containing cavity; the valve core assembly is movably arranged on the connecting assembly to open or close the valve port; the valve core assembly comprises a valve needle, the valve needle has a first balance cavity inside, the valve needle is provided with a first communication hole, the first balance cavity and the containing cavity are in communication through the first communication hole, and the first balance cavity is in communication with the outside of the valve port.

[0023] The application further provides an automobile comprising the refrigeration system comprising the electronic expansion valve. The electronic expansion valve comprises a connecting assembly, a valve shell and a valve core assembly; the connecting assembly has a valve port; the valve shell is connected with the connecting assembly away from the valve port, and the valve shell and the connecting assembly enclose a containing cavity; the valve core assembly is movably arranged on the connecting assembly to open or close the valve port; the valve core assembly comprises a valve needle, the valve needle has a first balance cavity inside, the valve needle is provided with a first communication hole, the first balance cavity and the containing cavity are in communication through the first communication hole, and the first balance cavity is in communication with the outside of the valve port.

[0024] The electronic expansion valve comprises a connecting assembly, a valve shell and a valve core assembly; the connecting assembly has a valve port; the valve shell is connected with the connecting assembly at an end away from the valve port, and the valve shell and the connecting assembly enclose a containing cavity; the valve core assembly is movably arranged in the connecting assembly to open or close the valve port; the valve core assembly comprises a valve needle, the valve needle has a first balance cavity inside, the valve needle is provided with a first communication hole, the first balance cavity and the containing cavity are communicated through the first communication hole, and the first balance cavity is communicated with the outside of the valve port. In this way, the outside of the valve port is communicated through the first balance cavity, the first communication hole and the containing cavity, so that the containing cavity and the outside of the valve port are balanced in pressure. When the valve core assembly moves up and down, the pressure inside and outside the valve port is balanced, so that the valve opening performance of the electronic expansion valve is improved, the valve needle can be smoothly opened under smaller resistance, the valve opening action voltage of the electronic expansion valve is reduced, and miniaturization and light weight are realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without any creative labor for those skilled in the art.

[0026] Figure 1 It is an embodiment structure diagram of the electronic expansion valve of the present application.

[0027] Figure 2 It is an embodiment structure diagram of the electronic expansion valve of the present application. Figure 1 It is another view structure diagram of the electronic expansion valve of the present application.

[0028] Figure 3 It is an embodiment structure diagram of the electronic expansion valve of the present application. Figure 2 It is an enlarged view of A in the embodiment of the present application.

[0029] Figure 4 It is an embodiment structure diagram of the mounting seat of the present application.

[0030] Figure 5 It is a top view of the mounting seat in the embodiment of the present application. Figure 4

[0031] It is a sectional view along line I-I in the embodiment of the present application. Figure 6 Figure 5 It is an embodiment structure diagram of the valve port seat of the present application.

[0032] Figure 7 It is a sectional view of the valve port seat in the embodiment of the present application.

[0033] Figure 8 Figure 7 It is an embodiment structure diagram of the valve port seat of the present application.

[0034] Figure 9 ​​The structure diagram of the valve needle of the present application;

[0035] Figure 10 The structure diagram of the valve needle of the present application; Figure 9 The sectional view of the valve needle of the present application;

[0036] Figure 11 The structure diagram of the valve needle of the present application; Figure 10 The enlarged view of B in the valve needle of the present application;

[0037] Figure 12 The structure diagram of two different types of the sealing ring of the present application.

[0038] Brief Description of the Drawings:

[0039]

[0040]

[0041] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0043] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0044] In addition, if the embodiments of the present application involve descriptions of “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, the meaning of “and / or” appearing throughout the text is that it includes three parallel schemes, taking “A and / or B” as an example, which includes A scheme, or B scheme, or A and B schemes. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection claimed by the present application.

[0045] The electronic expansion valve provided by the present application can be applied to a vehicle refrigeration system, and a fluid medium flowing through the electronic expansion valve is refrigerant used for heat exchange in the vehicle refrigeration system. At this time, the electronic expansion valve is installed at an evaporator inlet of the vehicle refrigeration system, and the electronic expansion valve is used as a demarcation element between a high-pressure side and a low-pressure side of the vehicle refrigeration system, throttles and depressurizes high-pressure liquid refrigerant, thereby adjusting and controlling a dose of the liquid refrigerant entering the evaporator, so that the dose of the liquid refrigerant can adapt to requirements of 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 in addition to the refrigerant, as long as the electronic expansion valve can realize throttling and depressurizing of the fluid medium, and no specific limitation is made in this regard.

[0046] The electronic expansion valve provided by the present application can be applied to a vehicle refrigeration system, and a fluid medium flowing through the electronic expansion valve is refrigerant used for heat exchange in the vehicle refrigeration system. At this time, the electronic expansion valve is installed at an evaporator inlet of the vehicle refrigeration system, and the electronic expansion valve is used as a demarcation element between a high-pressure side and a low-pressure side of the vehicle refrigeration system, throttles and depressurizes high-pressure liquid refrigerant, thereby adjusting and controlling a dose of the liquid refrigerant entering the evaporator, so that the dose of the liquid refrigerant can adapt to requirements of 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 in addition to the refrigerant, as long as the electronic expansion valve can realize throttling and depressurizing of the fluid medium, and no specific limitation is made in this regard.

[0047] Please refer to Figures 1 to 3 、 Figure 8 In an embodiment of the present application, the electronic expansion valve 10 comprises a connecting assembly 100, a valve shell 200 and a valve core assembly 300. The connecting assembly 100 has a valve port 121. The valve shell 200 is connected to an end of the connecting assembly 100 away from the valve port 121, and the valve shell 200 and the connecting assembly 100 form an accommodating cavity 210. The valve core assembly 300 is movably arranged in the connecting assembly 100, and is used 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 balance cavity 311 inside, the valve needle 310 is provided with a first communication hole 312, the first balance cavity 311 and the accommodating cavity 210 are communicated through the first communication hole 312, and the first balance cavity 311 is communicated with the outside of the valve port 121.

[0048] Specifically, the electronic expansion valve 10 further comprises a valve seat (not shown in the figure), which can be made of stainless steel, aluminum or other materials, and is not limited in particular. The valve seat can be cylindrical, square or other special-shaped.

[0049] In use, the fluid medium can enter from the first port, flow through the communication port 122 and the valve port 121, and then flow out from the second port. Conversely, the fluid medium can also enter from the second port, flow through the valve port 121 and the communication port 122, and then flow out from the first port. That is, the fluid medium can flow in from either the first port or the second port, and flow out from the other port. In this embodiment, the fluid medium flows in from the first port and flows out from the second port.

[0050] Referring to Figures 4 to 8 , the connection assembly 100 is internally hollow, and the valve core assembly 300 is movably arranged in the connection assembly 100 to open or close the valve port 121. It can be understood that the inside of the connection assembly 100 is used to guide the movement of the valve core assembly 300. The valve core assembly 300 comprises a valve needle 310 and a valve rod 320 connected together, which can be directly connected or indirectly connected through other components, and is not limited in particular. Under the drive of the power source, the valve rod 320 can drive the valve needle 310 to move, thereby approaching or moving away from the valve port 121. When the valve needle 310 tightly cooperates 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 separates 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] Referring to Figure 2 , Figure 8 and Figure 9The valve needle 310 has a first balance cavity 311 inside, the valve needle 310 is provided with a first communication hole 312, the first communication hole 312 is opened on the cavity wall of the first balance cavity 311, and the first balance cavity 311 and the containing cavity 210 are communicated through the first communication hole 312. At the same time, the first balance cavity 311 also communicates with the outside of the valve port 121, so that the outside of the valve port 121 is communicated through the first balance cavity 311, the first communication hole 312 and the containing cavity 210, so that the containing cavity 210 and the outside of the valve port 121 are balanced. When the valve core assembly 300 moves up and down, the inside and outside of the valve port 121 are balanced, so that the opening performance of the electronic expansion valve 10 is improved, the valve needle 310 can be smoothly opened under small resistance, the opening voltage of the electronic expansion valve 10 is reduced, and miniaturization and light weight are realized.

[0052] The electronic expansion valve 10 of the application comprises a connecting assembly 100, a valve housing 200 and a valve core assembly 300; the connecting assembly 100 has a valve port 121; the valve housing 200 is connected with the end of the connecting assembly 100 away from the valve port 121, and the valve housing 200 and the connecting assembly 100 enclose a containing cavity 210; the valve core assembly 300 is movably arranged in the connecting 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 balance cavity 311 inside, the valve needle 310 is provided with a first communication hole 312, the first balance cavity 311 and the containing cavity 210 are communicated through the first communication hole 312, and the first balance cavity 311 communicates with the outside of the valve port 121. In this way, the outside of the valve port 121 is communicated through the first balance cavity 311, the first communication hole 312 and the containing cavity 210, so that the containing cavity 210 and the outside of the valve port 121 are balanced. When the valve core assembly 300 moves up and down, the inside and outside of the valve port 121 are balanced, so that the opening performance of the electronic expansion valve 10 is improved, the valve needle 310 can be smoothly opened under small resistance, the opening voltage of the electronic expansion valve 10 is reduced, and miniaturization and light weight are realized.

[0053] In an embodiment, referring to Figures 3 to 8 The connecting assembly 100 comprises a mounting seat 110 and a valve port seat 120, opposite sides of the mounting seat 110 are through and form a positioning section 111, a guide section 112 and a mounting section 113, both ends of the guide section 112 are connected with the positioning section 111 and the mounting section 113 respectively, the valve port 121 is formed in the valve port seat 120, the valve port seat 120 is arranged in the mounting section 113, and the valve needle 310 extends into the guide section 112 and guides with the guide section 112.

[0054] Specifically, the connecting assembly 100 comprises two parts of a mounting seat 110 and a valve port seat 120, the valve port seat 120 is assembled with the mounting seat 110, of course, in other embodiments, the mounting seat 110 and the valve port seat 120 can also be provided as one component, which is not specifically limited. The opposite sides of the mounting seat 110 are through, and the through inner wall surface thereof 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 in the valve port seat 120, the valve port seat 120 is provided in a hollow column shape, the valve port 121 is located at one end of the valve port seat 120 in the length direction, and the communication port 122 is formed in the peripheral wall of the valve port seat 120, the number of the communication port 122 can be provided as multiple, and the multiple communication ports 122 are arranged in a circumferential direction interval along the valve port seat 120. The number of the communication port 122 can exemplarily be 2, 3 or 4.

[0055] Please refer to Figure 6 It should be noted that the positioning section 111, the guide section 112 and the mounting section 113 are formed by the opposite sides of the mounting seat 110 being through, the positioning section 111 can be understood as the groove wall of the one side sink groove of the mounting seat 110, the mounting section 113 is the groove wall of the other side sink groove of the mounting seat 110, and the guide section 112 is the hole wall of the through hole formed after penetrating the two sink groove bottoms 112a2. The valve port seat 120 is arranged in the mounting section 113, the valve needle 310 extends into the guide section 112 and is guided and matched with the guide section 112, and the valve needle 310 also extends into the hollow valve port seat 120, and moves up and down to realize the opening or closing of the valve port 121.

[0056] Please refer to Figures 3 to 6 In an embodiment, the guide section 112 is provided with a balance groove 112a, and the first communication hole 312 communicates with the containing cavity 210 through the balance groove 112a. Specifically, the valve needle 310 extends into the guide section 112 and is guided and matched with the guide section 112, and the guide section 112 plays a guiding role for the valve needle 310. At the same time, the balance groove 112a is provided in the guide section 112, the balance groove 112a is a groove arranged in the guide section 112, the first communication hole 312 and the containing cavity 210 communicate through the balance groove 112a, that is, the position of the first communication hole 312 can correspond to the balance groove 112a, in this way, the length of the mounting seat 110 can be shortened, and the length of the valve needle 310 can also be shortened, 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] Please refer to Figures 1 to 3In an embodiment, the electronic expansion valve 10 further comprises a nut assembly 400 which is mounted to the connecting assembly 100 and cooperates with the valve core assembly 300, the nut assembly 400 is provided with a second communication hole 410, and a second balance cavity 500 is formed between the nut assembly 400, the connecting assembly 100 and the valve core assembly 300, the second balance cavity 500 is communicated with the balance groove 112a; the first communication hole 312 communicates the first balance cavity 311 and the balance groove 112a, and the second communication hole 410 communicates the second balance cavity 500 and the accommodating cavity 210.

[0058] Specifically, the nut assembly 400 is fixedly mounted to the mounting seat 110 away from the valve port seat 120, the nut assembly 400 has an internal thread, the valve rod 320 has an external thread, the nut assembly 400 is threadedly cooperated with the valve rod 320, and the valve rod 320 is connected with the valve needle 310 together, when the valve rod 320 is rotated under the driving of the power source, the valve rod 320 can move up and down relative to the nut assembly 400, and the valve needle 310 moves up and down under the driving of the valve rod 320, so as to approach or move away from the valve port 121. The valve shell 200 is sleeved outside the nut assembly 400 and the valve core assembly 300, the valve shell 200 is designed in a substantially cylindrical shape, and the valve shell 200 can be fixed to the mounting seat 110 by welding. The accommodating cavity 210 of the valve shell 200 further accommodates a rotor assembly 700, the rotor assembly 700 is connected with the valve rod 320, and the valve rod 320 is rotated under the driving of the rotor assembly 700, so as to drive the valve needle 310 to move up and down in the connecting seat.

[0059] Please refer to Figure 3 , the nut assembly 400 is provided with the second communication hole 410, and the second balance cavity 500 is formed between the nut assembly 400, the connecting assembly 100 and the valve core assembly 300, the second balance cavity 500 is communicated with the balance groove 112a, the first communication hole 312 communicates the first balance cavity 311 and the balance groove 112a, and the second communication hole 410 communicates the second balance cavity 500 and the accommodating cavity 210, that is to say, the external environment of the valve port 121 is communicated with the accommodating cavity 210 in sequence through the first balance cavity 311, the first communication hole 312, the balance groove 112a, the second balance cavity 500 and the second communication hole 410, so as to ensure that the pressure inside and outside the valve port 121 is balanced, thereby improving the opening performance of the electronic expansion valve 10.

[0060] In another embodiment, the electronic expansion valve 10 further comprises a nut assembly 400 which is mounted to the connecting assembly 100 and cooperates with the valve core assembly 300, the nut assembly 400 is provided with a second communication hole 410, and a second balance cavity 500 is formed between the nut assembly 400, the connecting assembly 100 and the valve core assembly 300, the first communication hole 312 communicates the first balance cavity 311 and the second balance cavity 500, and the second communication hole 410 communicates the accommodating cavity 210 and the second balance cavity 500.

[0061] As described in the previous embodiment, the nut assembly 400 is fixedly mounted on the side of the mounting base 110 away from the valve port seat 120. The nut assembly 400 has an internal thread, and the valve stem 320 has an external thread. The nut assembly 400 and the valve stem 320 are threadedly engaged, and the valve stem 320 is connected to the valve needle 310. 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, thereby approaching or moving away from the valve port 121. The valve housing 200 is sleeved on the outside of the nut assembly 400 and the valve core assembly 300. The valve housing 200 is designed to be roughly cylindrical, and the valve housing 200 and the mounting base 110 can be fixed by welding. The accommodating cavity 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 communicating 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. The external environment of the valve port 121 is connected to the accommodating chamber 210 through the first balancing chamber 311, the first communicating hole 312, the second balancing chamber 500, and the second communicating 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 that are opposite each other. The notch 112a1 is located on the first step surface 114 and communicates with the space formed by the positioning section 111, thereby communicating with the accommodating chamber 210 through the second balancing cavity 500 and the second communication 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 6Further, 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. In this way, the first communication hole 312 can always communicate with the balance groove 112a, and the movement of the valve needle 310 does 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] Please refer to Figure 3 and Figure 12 It is worth mentioning that the electronic expansion valve 10 further comprises a sealing ring 600, which is arranged on the mounting section 113 and located between the second step surface 115 and the valve port seat 120. Specifically, the sealing ring 600 is arranged on the mounting section 113 and located between the first step surface 114 and the valve port seat 120. The sealing ring 600 mainly plays a sealing role to prevent the high-pressure refrigerant from flowing into the containing cavity 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 does not communicate with the space formed by the mounting section 113, and the sealing ring 600 is arranged on the mounting section 113, specifically close to the second step surface 115, the relative two sides of the sealing ring 600 are balanced, and deformation does not occur, thereby further ensuring the sealing property of the sealing ring 600.

[0067] Further, the inner diameter of the sealing ring 600 is consistent with the diameter of the valve port 121. In this way, the sealing ring 600 can be sealed with the outer wall surface of the valve needle 310, thereby achieving a better sealing effect.

[0068] Further, the cross section of the sealing ring 600 is any one of a circle, a rectangle, a D shape, a Y shape, or a U shape, and / or the outer surface of the sealing ring 600 is provided with a lubricating coating. Specifically, the sealing ring 600 can be of various types, and the cross section of the sealing ring 600 can be any one of a circle, a rectangle, a D shape, a Y shape, or a U shape, as long as a better sealing effect is achieved. In this embodiment, the cross section of the sealing ring 600 is preferably a D-shaped sealing ring 600. Alternatively, a lubricating coating can be provided on the outer surface of the sealing ring 600 to avoid wear of the sealing ring 600 caused by long-term up-and-down movement of the valve needle 310, thereby affecting the sealing effect of the sealing ring 600.

[0069] It should be noted that the material of the sealing ring 600 is silica gel or rubber. Since the valve needle 310 needs to move reciprocally, in order to avoid the sealing ring 600 from being abraded, a wear-resistant layer can be arranged on the outer side of the sealing ring 600, so that the wear-resistant layer is in contact with the guide section 112, thereby avoiding the sealing ring 600 from being abraded when the valve core assembly 300 moves, so as to ensure the sealing performance of the sealing ring 600. The material of the wear-resistant layer has various types. In an embodiment, the material of the wear-resistant layer is polytetrafluoroethylene. The polytetrafluoroethylene (PTFE for short) is a high molecular polymer prepared by polymerization of tetrafluoroethylene as a monomer, and has excellent heat resistance and cold resistance. The polytetrafluoroethylene has extremely low friction coefficient, thereby playing a lubricating role, so as to reduce the friction resistance between the guide section 112 and the sealing ring 600, so as to avoid the sealing ring 600 from being damaged due to friction with the guide section 112, and improve the service life of the sealing ring 600.

[0070] Please refer to Figure 3 and Figure 9 In an embodiment, the number of the first communication holes 312 is one, or the number of the first communication holes 312 is 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 multiple, and the number of the first communication holes 312 exemplarily can be one, two, three or four. In the embodiment, the number of the first communication holes 312 is two, and the two sealing rings 600 are symmetrically arranged on the peripheral wall of the valve needle 310.

[0071] Please refer to Figure 9 and Figure 10 In an embodiment, the valve needle 310 has opposite first and second ends 310a and 310b, the second end 310b is arranged close to the valve port 121, and the valve needle 310 has a first sealing section 313, which is arranged in a tapered manner in the direction from the first end 310a to the second end 310b.

[0072] Specifically, the valve needle 310 has the first and second ends 310a and 310b along the length direction thereof, and the second end 310b is an end for opening or closing the valve port 121. The second end 310b of the valve needle 310 is provided with the first sealing section 313, which is arranged in a tapered manner in the direction from the first end 310a to the second end 310b. The first sealing section 313 arranged in a tapered manner is used to adjust the flow of the refrigerant passing through the electronic expansion valve 10.

[0073] Please continue to refer to Figure 9 and Figure 10Further, the valve needle 310 further has a second sealing section 314 connected with the first sealing section 313, the second sealing section 314 is located at a side of the first sealing section 313 close to the valve port 121, and the second sealing section 314 is tapered in the direction from the first end 310a to the second end 310b. Specifically, a second sealing section 314 can be further provided on the basis of the first sealing section 313, and the flow of the refrigerant through the electronic expansion valve 10 is adjusted by the first sealing section 313 and the second sealing section 314.

[0074] It can be understood that the first sealing section 313 and the second sealing section 314 are both tapered in the direction from the first end 310a to the second end 310b. When the valve needle 310 is switched from the state of closing the valve port 121 to the state of opening, the refrigerant will flow out through the gap between the first sealing section 313 and the valve port 121, and 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 adjusting the flow. Similarly, the second sealing section 314 is provided on the basis of the first sealing section 313, and 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 adjusting the flow.

[0075] Please refer to Figure 11 Further, 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, and α < β is satisfied. In this way, in the radial direction of the valve needle 310, when the first sealing section 313 of the valve needle 310 coincides with the edge of the valve port 121, the flow of the refrigerant through the electronic expansion valve 10 is smaller at this time, and when the second sealing section 314 of the valve needle 310 coincides with the edge of the valve port 121, the flow of the refrigerant through the electronic expansion valve 10 is greater than the flow when the first sealing section 313 of the valve needle 310 coincides with the edge of the valve port 121. The first sealing section 313 and the second sealing section 314 can meet the demand of the electronic expansion valve 10 for adjusting different flow sizes.

[0076] Please refer to Figure 3 and Figure 11 In an embodiment, the first balance cavity 311 includes a first cavity hole 311a and a second cavity hole 311b connected in communication, the first communication hole 312 is arranged on the hole wall of the first cavity hole 311a, the second cavity hole 311b is arranged on the second sealing section 314, and the hole diameter of the first cavity hole 311a is greater than the hole diameter of the second cavity hole 311b.

[0077] Specifically, the first communication hole 312 is arranged on the hole wall of the first cavity hole 311a, and the second cavity hole 311b is arranged on the second sealing section 314, and the second cavity hole 311b is directly communicated with the external environment of the valve port 121. Since the second sealing section 314 is arranged in a tapered manner from the first end 310a to the second end 310b, the diameter of the second cavity hole 311b is smaller than the diameter of the first cavity hole 311a.

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

[0079] Please refer to Figure 10 and Figure 11 In an embodiment, the outer periphery of the valve needle 310 is further provided with a protruding portion 315, the protruding portion 315 is connected with the first sealing section 313, and the outer diameter of the protruding portion 315 is greater than the diameter of the valve port 121. Specifically, the outer periphery of the valve needle 310 is further provided with a protruding portion 315, the protruding portion 315 is arranged on the second end 310b of the valve needle 310, and the protruding portion 315 is connected with the first sealing section 313. The outer diameter of the main body of the valve needle 310 is substantially the same as the inner diameter of the main body, and the outer diameter of the protruding portion 315 is greater than the diameter of the valve port 121. When the valve needle 310 closes the valve port 121, the protruding portion 315 with a diameter greater than the diameter of the valve port 121 can better block the flow of liquid refrigerant from the communication port 122 to the valve port 121 and out, greatly improving the closing effect of the valve needle 310 on the valve port 121.

[0080] In an embodiment, the valve port 121 has a port diameter ranging from 4mm to 7mm. Specifically, the valve port 121 has a port diameter ranging from 4mm to 7mm, preferably from 4.5mm to 6.5mm. The valve port 121 can have a port diameter of 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5.0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6.0mm, 6.5mm, 7mm, for example.

[0081] Referring to Figure 1 In an embodiment, the electronic expansion valve 10 further comprises a stator assembly 800, which 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 application is as follows:

[0083] The stator assembly 800 of the electronic expansion valve 10 generates a magnetic field after being energized. The rotor assembly 700 made of magnetic material rotates under the drive of the magnetic field. The rotor assembly 700 is fixedly connected with the valve rod 320, and the rotation of the rotor assembly 700 drives the valve rod 320 to rotate. The valve rod 320 and the nut assembly 400 form a threaded connection, and the nut assembly 400 is fixedly arranged on the mounting seat 110. Therefore, the rotation of the valve rod 320 relative to the nut assembly 400 drives the valve rod 320 to move up and down relative to the nut assembly 400, thereby realizing the working process that the stator assembly 800 drives the rotor assembly 700 to move, and the rotor assembly 700 drives the valve core assembly 300 to move. The valve needle 310 moves towards the valve port 121 under the drive of the valve rod 320. When the valve needle 310 blocks the valve port 121, the electronic expansion valve 10 is closed. When the valve needle 310 unblocks the valve port 121, the electronic expansion valve 10 is opened. Since the opening diameter of the passage 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 electronic expansion valve 10 on the fluid medium.

[0084] The present application also provides a refrigeration system comprising the electronic expansion valve. The specific structure of the electronic expansion valve is referred to the above embodiments. Since the present refrigeration system adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described here.

[0085] The application further provides an automobile comprising the refrigeration system. The refrigeration system comprises the electronic expansion valve, and the specific structure of the electronic expansion valve is referred to the above embodiments. Since the automobile adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0086] The above only describes the preferred embodiments of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like within the inventive concept of the application and the content of the specification and drawings are included in the patent protection scope of the application.

Claims

1. An electronic expansion valve, characterized in that: The electronic expansion valve comprises: A connecting 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 interior of the valve needle has a first balancing chamber, 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.

2. The electronic expansion valve according to claim 1, characterized in that: 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, and the valve port seat is arranged on the mounting section. The valve needle extends into the guide section and cooperates with the guide section.

3. The electronic expansion valve according to claim 2, characterized in that: The guide section is provided with a balancing groove, and the first communicating hole is communicated with the accommodating cavity through the balancing groove.

4. The electronic expansion valve according to claim 2, 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. A second balancing chamber is formed between the nut assembly, the connecting assembly and the valve core assembly. The second balancing chamber is connected to the balancing groove; the first communicating hole connects the first balancing chamber and the balancing groove, and the second communicating hole connects the second balancing chamber and the accommodating chamber.

5. The electronic expansion valve according to claim 2, 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 installation 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.

6. The electronic expansion valve according to claim 5, characterized in that: When the valve needle closes the valve port, the first communicating hole is located between the notch and the groove bottom.

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

8. The electronic expansion valve according to claim 7, characterized in that: The inner diameter of the sealing ring is consistent with the caliber of the valve port.

9. The electronic expansion valve according to claim 7, 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.

10. The electronic expansion valve according to any one of claims 1 to 9, 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 circumference of the valve needle.

11. The electronic expansion valve according to any one of claims 1 to 9, 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, which is gradually tapered in the direction from the first end to the second end.

12. The electronic expansion valve according to claim 11, wherein: The valve needle also 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. In the direction from the first end to the second end, the second sealing segment is tapered.

13. The electronic expansion valve according to claim 12, wherein: An included angle α is formed between the first sealing section and the axis of the valve needle, and an included angle β is formed between the second sealing section and the axis of the valve needle, satisfying α<β.

14. The electronic expansion valve according to claim 12, wherein: The first balancing cavity includes a first cavity hole and a second cavity hole that are connected. The first communicating hole is set 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.

15. The electronic expansion valve according to claim 14, characterized in that The aperture of the first cavity is greater than or equal to 2 mm, and / or the aperture of the second cavity is greater than or equal to 0.5 mm.

16. The electronic expansion valve according to claim 11, wherein: 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.

17. The electronic expansion valve according to any one of claims 1 to 9, characterized in that: The caliber range of the valve port is 4mm-7mm.

18. The electronic expansion valve according to any one of claims 1 to 9, 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. 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.

19. A refrigeration system, characterized in that: Comprising the electronic expansion valve according to any one of claims 1 to 18.

20. An automobile, characterized in that: Comprising the refrigeration system of claim 19.

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