Electronic expansion valve

Abstract

According to an embodiment of the present invention, an electronic expansion valve may comprise: a sun gear coupled to a rotor and configured to rotate around a central axis; a spin gear meshed with gear teeth formed on the body of the sun gear; an orbit gear disposed below the spin gear and meshed with the gear teeth formed on the body of the sun gear; an output carrier coupled to the orbit gear and rotating depending on revolution of the orbit gear around the central axis; a screw shaft coupled to the center of the output carrier along the central axis; a needle unit vertically moved by the screw shaft to control the opening degree of a pipe; and a valve seat storing the needle unit and coupled to the pipe.

Description

electronic expansion valve

[0001] The present invention relates to an electronic expansion valve capable of precisely controlling the flow rate of a fluid.

[0002] An electronic expansion valve (hereinafter also referred to as "EEV") is a device for precisely controlling the flow rate of a fluid, such as a refrigerant, or the degree of system superheating using an electronic control device.

[0003] Generally, the electronic expansion valve is used in various industrial fields utilizing refrigeration cycles. For example, the electronic expansion valve is utilized in various technological fields such as air conditioners, heat pump systems, and cold chains.

[0004] In addition, electronic expansion valve types can be classified into a 'direct-acting type' that directly transmits the rotation of the rotor to the needle to open and close the valve, and a 'geared type' that reduces the rotation of the rotor using a gear mechanism and transmits it to the needle.

[0005] Here, the gear-type electronic expansion valve is generally installed in the 'indoor unit' of an air conditioner because it has smaller size, vibration, and noise than the direct-acting electronic expansion valve and allows for more precise control of the refrigerant flow rate.

[0006] To reduce noise generated in the indoor unit of an air conditioner and improve performance, it is necessary to secure clearance space for branch piping inside the indoor unit and install strainers, thus requiring a compact design. Therefore, assuming that the electronic expansion valve installed in the indoor unit has performance equivalent to or better than existing ones, the smaller the size and the lower the noise, the higher the potential for future market success and the greater the premium value it can command.

[0007] Meanwhile, a gear-type electronic expansion valve installed in the indoor unit of a conventional air conditioner may have a 'stepper motor integrated spur gear structure' in which a stepper motor is integrated and power is transmitted to a needle by a spur gear. A prior art document related to this is CN 103453201 B (hereinafter referred to as Prior Art 1).

[0008] However, the above-mentioned prior art 1, which has a stepper motor integrated spur gear structure, has a connection structure of spur gears that are relatively large in size to secure a gear reduction ratio or output torque for precise control of the refrigerant flow rate (in other words, increasing the resolution of the valve opening degree). Therefore, the above-mentioned prior art 1 has the problem of being difficult to install in an indoor unit with limited space and reducing the design freedom for the refrigeration cycle.

[0009] In addition, since the needle, gear, and motor are integrated into a pipe through which the refrigerant flows, there is a risk that a short circuit may occur if the refrigerant leaks into the motor.

[0010] Furthermore, the above prior art 1 may use bellows parts to prevent the risk of short circuits, but the bellows parts have the problem of incurring relatively high processing costs and additional assembly processes.

[0011] Meanwhile, KR 10-2391438 B1 (hereinafter referred to as prior art 2) is a prior art document for a gear-type electronic expansion valve using planetary gears by improving the above-mentioned stepper motor integrated spur gear structure.

[0012] However, the prior art 2, which uses the above-mentioned planetary gear structure, has a structure in which the planetary carrier formed integrally with the rotor forms the shaft of the planetary gear so as to transmit rotational force directly to the planetary gear. Due to the relatively strong torque, the wear rate increases as the usage time increases, and there is a relatively disadvantageous problem in terms of sliding contact or friction between gears.

[0013] In addition, the above-mentioned prior art 2 has a problem in that the gear efficiency is relatively low and the reduction ratio is relatively low, in that the ring gear (fixed internal gearing) is fixed to a box body fixed to a valve seat and gear teeth are formed on the inner circumference to mesh with the gear teeth of the planetary gear for rotation of the planetary gear.

[0014] Furthermore, the above-mentioned prior art 2 has an integrated structure in which the planetary gear is extended in the vertical direction, and the lower part of the planetary gear has a structure that meshes with the inner gear of the output carrier (output internal gearing) which is coupled with a threaded rod (i.e., needle). Therefore, in order to satisfy the gear meshing ratio requirements for continuous rotation considering wear, etc., the design freedom of the planetary gear is reduced, and there is a problem that it becomes difficult to simplify the design.

[0015] In addition, if the above-mentioned prior art 2 attempts to increase the number of gear teeth to compensate for low gear efficiency and reduction ratio, the overall size increases. Furthermore, as the size of the gear-type electronic expansion valve according to the structure of prior art 2 increases, there is a problem that contradicts the purpose of installing the indoor unit described above.

[0016] The objective of the present invention is to provide an electronic expansion valve capable of solving the problems of the aforementioned prior art.

[0017] Another objective of the present invention is to provide an electronic expansion valve with a reduced size compared to conventional valves.

[0018] Another objective of the present invention is to provide an electronic expansion valve having a structure with an improved gear reduction ratio compared to conventional valves.

[0019] Another objective of the present invention is to provide an electronic expansion valve that achieves stable conversion from rotational motion to vertical linear motion and improved gear efficiency for rotational motion and vertical linear motion transmitted from the rotor to the needle.

[0020] Another objective of the present invention is to provide an electronic expansion valve that prevents play from occurring in a configuration that must maintain a fixed position due to the influence of vertical or rotational movement.

[0021] Another objective of the present invention is to provide an electronic expansion valve in which a carrier having a rotational center axis of said spin gear is provided in a non-rotating fixed structure so as to ensure stable spin of the spin gear receiving rotational motion from a sun gear coupled to a rotor.

[0022] Another objective of the present invention is to provide an electronic expansion valve that prevents vertical play or positional movement of a spin gear (or an uppermost planetary gear connected to a sun gear).

[0023] To achieve the above objective, an electronic expansion valve according to an embodiment of the present invention may include a sun gear coupled to a rotor and rotating about a central axis, a spin gear connected to mesh with a gear tooth formed on the body of the sun gear, a fixed carrier having a spin gear shaft that supports the spin gear, and an orbit gear connected to mesh with a gear tooth formed on the body of the sun gear at the lower side of the spin gear.

[0024] Additionally, it may further include an output carrier having an orbital gear shaft that supports the orbital gear and rotates as the orbital gear revolves around the central axis.

[0025] Additionally, it may further include a screw shaft coupled along the central axis at the center of the output carrier, a needle part that moves up and down to control the opening degree of the pipe by the screw shaft, and a valve seat that accommodates the needle part and to which the pipe is coupled.

[0026] Additionally, it may further include a holder supporter coupled to the valve seat and having threads that guide the screw shaft to rotate and move up and down about the central axis, and a holder coupled to the holder supporter.

[0027] In addition, the fixed carrier can be coupled to the top of the holder.

[0028] In addition, the fixed carrier may have a structure that is non-rotating and maintains a fixed position by being coupled to the top of the holder.

[0029] Additionally, it may further include a fixed carrier plate positioned at the bottom of the spin gear to prevent play or movement in the vertical direction of the spin gear, and coupled with the bottom of the fixed carrier.

[0030] Additionally, the device further includes a ring gear in which an upper gear formed on the upper part of the inner surface meshes with the spin gear, and a lower gear formed on the lower part of the inner surface meshes with the orbit gear, and the inner surface of the ring gear may be formed to surround the spin gear and the orbit gear in a radial direction.

[0031] In addition, the fixed carrier is coupled with the holder to provide fixing force, and the fixed carrier plate is coupled to the bottom surface of the fixed carrier to apply pressure to the spin gear in the up and down direction.

[0032] In addition, the upper outer surface of the fixed carrier and the upper part of the holder may form corresponding protrusions and support grooves to have mutually mating shapes.

[0033] In addition, the above-mentioned protruding end is inserted into and coupled with the above-mentioned support groove, so that the above-mentioned fixed carrier can be fixed by the holder.

[0034] In addition, the holder has a flange seating portion formed at its lower end so as to be seated on a flange protruding from the outer circumference of the holder supporter, and the flange seating portion of the holder can be coupled to the flange of the holder supporter.

[0035] Additionally, the protruding end is formed to protrude radially along the upper outer surface of the fixed carrier, and the support groove may be formed to be recessed downward from the top of the holder so that the protruding end is inserted and coupled.

[0036] In addition, the upper outer surface of the fixed carrier may be arranged such that a protruding end and a recessed end formed in the direction of the central axis relative to the protruding end, which guides the coupling of the holder, intersect each other along the circumferential direction.

[0037] Additionally, it may further include a fixed carrier plate coupled to the lower end of the spin gear shaft to press the spin gear so as to rotate it in the up and down direction together with the fixed carrier.

[0038] In addition, the fixed carrier and the fixed carrier plate have a disc shape with an open center so as to be aligned along a central axis (A1), and the spin gear shaft is formed between the fixed carrier and the fixed carrier plate to guide the rotation of the spin gear.

[0039] Additionally, the spin gear may include a first spin gear, a second spin gear, and a third spin gear spaced apart at intervals of 120 degrees in the circumferential direction with respect to the central axis (A1).

[0040] Additionally, the spin gear shaft may include a first spin gear shaft providing a rotational center axis of the first spin gear, a second spin gear shaft providing a rotational center axis of the second spin gear, and a third spin gear shaft providing a rotational center axis of the third spin gear.

[0041] In addition, the fixed carrier can press the disc-shaped upper portion and the disc-shaped fixed carrier plate to support rotation on the upper and lower sides of the spin gear so that the spin gear spins stably.

[0042] In addition, the fixed carrier plate may form a hole or groove at a position corresponding to the upper and lower ends of the spin gear shaft.

[0043] In addition, the lower end of the spin gear shaft can be inserted or fitted into the hole or groove of the fixed carrier plate.

[0044] In addition, the fixed carrier may further include a support shaft formed between a plurality of spin gear shafts arranged circumferentially to guide coupling with the fixed carrier plate and to provide more robust support for the spin gear in the vertical direction.

[0045] In addition, when the fixed carrier plate is coupled to the fixed carrier, the virtual circle (C1) connecting the respective midpoints of the coupling member inserted into the spin gear shaft and the shaft coupling member inserted into the support shaft to couple the fixed carrier plate may have a diameter larger than the outer diameter of the sun gear through hole.

[0046] Additionally, the output carrier may include an orbital gear shaft that forms a rotational center axis for the rotation of the orbital gear.

[0047] In addition, the output carrier may have an output carrier plate attached to its top to support the rotational movement of the orbit gear from above and below.

[0048] Additionally, it may further include an output coupling member coupled to the upper end of the orbital gear shaft for pressing the output carrier plate downward.

[0049] In addition, the output carrier plate forms a groove or hole at a position corresponding to the orbital gear shaft, and the upper end of the orbital gear shaft can be inserted into the groove or hole of the output carrier plate and fixed by the output coupling member.

[0050] In addition, even when the output carrier plate is coupled with the output carrier, the sun gear and screw shaft can be rotatably positioned at the center of the output carrier along the central axis (A1).

[0051] Additionally, the output carrier may further include an output support shaft formed between each orbital gear shaft in the circumferential direction, which guides the coupling of the output carrier plate to provide support or pressure in the vertical direction to the orbital gear.

[0052] According to the present invention, since a fixed carrier having a rotational center axis of a spin gear can maintain a non-rotating fixed structure, the spin gear, which receives rotational motion from a sun gear coupled with a rotor, can spin stably.

[0053] According to the present invention, vertical play or positional displacement of the spin gear caused by the vertical movement of the orbit gear and the shaft can be prevented, thereby preventing a decrease in reduction efficiency and ensuring product stability and reliability.

[0054] According to the present invention, the spin gear does not rise, fall, or play, so the power received from the sun gear can be effectively transmitted to the ring gear.

[0055] According to the present invention, a multi-stage planetary gear train structure can be proposed that improves the resolution of valve opening degree compared to conventional methods while simultaneously reducing the size. Accordingly, the present invention is suitable for indoor unit installation and can improve the degree of freedom in configuring the refrigeration cycle.

[0056] According to the present invention, since the stator (or the coil portion of the motor) is located outside the rotor, gear portion, and needle portion, components (e.g., bellows) designed to prevent refrigerant inflow as in the past can be eliminated, thereby reducing manufacturing costs and improving economic efficiency compared to the past.

[0057] According to the present invention, a gear portion for deceleration is disposed inside the rotor, and a structure is provided that minimizes the height of the vertical movement components disposed between the gear portion and the needle, thereby minimizing the height of the electronic expansion valve.

[0058] FIG. 1 is an external perspective view of an electronic expansion valve according to an embodiment of the present invention.

[0059] FIG. 2 is an exploded view showing the configuration of an electronic expansion valve according to an embodiment of the present invention.

[0060] Figure 3 is a cross-sectional view of X-X' of Figure 1.

[0061] FIG. 4 is a drawing showing the shaft receiver, shaft, sun gear, and fixed carrier of an electronic expansion valve according to an embodiment of the present invention disassembled along the central axis (A1).

[0062] FIG. 5 is a drawing showing the fixed carrier, holder, and holder supporter of an electronic expansion valve according to an embodiment of the present invention disassembled along the central axis (A1).

[0063] FIG. 6 is a perspective view showing a fixed carrier of an electronic expansion valve according to an embodiment of the present invention.

[0064] FIG. 7 is a perspective view showing the combined appearance of a fixed carrier and a fixed carrier plate of an electronic expansion valve according to an embodiment of the present invention.

[0065] FIG. 8 is a perspective view showing an output carrier of an electronic expansion valve according to an embodiment of the present invention.

[0066] FIG. 9 is a perspective view showing the combined appearance of the output carrier and the output carrier plate of an electronic expansion valve according to an embodiment of the present invention.

[0067] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0068] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.

[0069] FIG. 1 is an external perspective view of an electronic expansion valve according to an embodiment of the present invention.

[0070] In the following description of the configurations according to the embodiments of the present invention, "rotation" can be understood as rotation in a broad sense. That is, rotation in the broad sense is defined to include both spin and orbit. Here, "spin" can be defined as a rotation in which the center of rotation is located on the inner side of the object to be rotated. Additionally, "orbit" (or revolution) can be defined as a rotation in which the center of rotation is located on the outer side of the object to be rotated.

[0071] Referring to FIG. 1, the electronic expansion valve (1) can be operated to control the flow rate of fluid flowing from the first pipe (31) to the second pipe (32). For example, the electronic expansion valve (1) can control the flow rate of fluid by closing or opening the orifice connecting the first pipe (31) and the second pipe (32) in minute increments using a needle (250).

[0072] In addition, the electronic expansion valve (1) can precisely control the flow rate of fluid passing from the first pipe (31) to the second pipe (32) or vice versa by finely adjusting the degree of opening.

[0073] The operation of the electronic expansion valve (1) blocking fluid flow between the first pipe (31) and the second pipe (32) can be defined as Full Close, and the operation of maximizing fluid flow between the first pipe (31) and the second pipe (32) can be defined as Full Open (or Full Stroke). The electronic expansion valve (1) can finely adjust the opening area through a continuous operation between Full Close and Full Open via the up-and-down linear movement of the needle (250).

[0074] Accordingly, the resolution of the valve opening degree of the electronic expansion valve (1) can be understood as an indicator for determining how finely the movement or passage area of ​​the needle can be controlled in units or sizes between the fully closed and fully open operations.

[0075] The above electronic expansion valve (1) may include a valve cover (10) and a valve seat (20) that form the exterior. For example, the valve cover (10) and the valve seat (20) may be named a 'case part'.

[0076] The valve seat (20) may be formed to connect the first pipe (31) and the second pipe (32). A needle portion (200), to be described later, may be located inside the valve seat (20) to control the flow of fluid between the first pipe (31) and the second pipe (32).

[0077] Additionally, a motor part (50, 60, 70) and a gear part (100) that drive the vertical linear movement of the needle part (200) may be located inside the valve cover (10).

[0078] The valve cover (10) may be coupled to the upper part of the valve seat (20). For example, a guide groove (25) may be formed on the upper part of the valve seat (20) to guide the coupling of the valve cover (10). The guide groove (25) may be formed in a screw thread shape. Alternatively, a guide groove (25) capable of coupling the valve seat (20) may be formed on the valve cover (10).

[0079] Meanwhile, the valve cover (10) may be formed of a non-magnetic material so as not to affect the magnetic phenomena of the rotor (50) and the stator (60).

[0080] The valve seat (20) may include a first insertion port to which the first pipe (31) is connected and a second insertion port to which the second pipe (32) is connected.

[0081] The above valve seat (20) can connect the first pipe (31) coupled to the first insertion port and the second pipe (32) coupled to the second insertion port so that fluid flow is possible.

[0082] The valve seat (20) can define an installation space (22, or inner space) for a needle part (200) that controls the flow or flow rate of fluid between the first insertion port and the second insertion port.

[0083] The above installation space (22) may be installed to accommodate the elastic member (240) and spindle (210) of the needle part (200).

[0084] The valve seat (20) may form a supporter seating groove (27) by giving a change in diameter or a step to the inner surface where the installation space (22) is formed. A holder supporter (170) may be seated and coupled in the supporter seating groove (27).

[0085] The holder supporter (170) may be provided so that a supporter body (173) and / or a supporter bottom surface (174) are inserted and seated in the supporter seating groove (27).

[0086] A space may be defined inside the valve cover (10) in which a gear part (100) for driving the vertical linear movement of the needle part (200) and a rotor (50) for driving the rotational movement of the gear part (100) are installed.

[0087] FIG. 2 is an exploded view showing the configuration of an electronic expansion valve according to an embodiment of the present invention, FIG. 3 is a cross-sectional view of FIG. 1 along X-X', FIG. 4 is a diagram showing the shaft receiver, shaft, sun gear, and fixed carrier of an electronic expansion valve according to an embodiment of the present invention exploded along the central axis (A1), and FIG. 5 is a diagram showing the fixed carrier, holder, and holder supporter of an electronic expansion valve according to an embodiment of the present invention exploded along the central axis (A1).

[0088] Referring to FIGS. 2 to 5, the electronic expansion valve (1) may further include a shaft receiver (110) accommodated in the inner space of the valve cover (10) and a shaft (118) arranged to be coaxial with the central axis line (A1) of the electronic expansion valve (1).

[0089] The shaft receiver (110) can be fixed or coupled to the upper inner surface of the valve cover (10). For example, the upper support member (112) and the side support member (114) can be fitted into the inner surface of the valve cover (10).

[0090] The shaft receiver (110) may be installed to be in close contact with the inner surface of the valve cover (10) in an upward and / or circumferential direction. Additionally, the shaft receiver (110) may be formed to extend upward and downward and / or radially with respect to the central axis (A1). For example, the shaft receiver (110) may have a disc or wheel shape.

[0091] Specifically, the shaft receiver (110) may include an upper support portion (112) formed to protrude upward from the center along the central axis (A1) so as to contact the center of the upper surface of the valve cover (10).

[0092] The inner space of the valve cover (10) can be defined as the upper surface of the valve cover (10) and an inner surface that extends continuously from the upper surface and extends in a circumferential direction to have a predetermined width.

[0093] Additionally, the shaft receiver (110) may further include a side support (114) that extends radially from the center with respect to the central axis (A1) and contacts the inner surface of the valve cover (10).

[0094] The above-mentioned side support member (114) extends circumferentially along the inner surface of the valve cover (10) and can be positioned to be perpendicular to the upper support member (112).

[0095] The shaft receiver (110) may be formed such that the diameter of the side support (114) is larger than the diameter of the top support (112).

[0096] Additionally, the shaft receiver (110) may further include a lower support (116) formed to protrude downward from the center.

[0097] The lower support member (116) may be positioned on the opposite side in the vertical direction from the upper support member (112). For example, the lower support member (116) may be extended vertically with respect to the central axis (A1) so as to have the same diameter as the upper support member (112).

[0098] The lower support member (116) and the upper support member (112) can respectively define the upper and lower surfaces of the center of the shaft receiver (110).

[0099] The shaft receiver (110) may further include a shaft hole (118a) formed open in the vertical direction along the central axis (A1) at the center and / or center. Specifically, the upper support (112) and the lower support (116) may form a shaft hole (118a) that allows rotation and vertical movement of the shaft (118) along the central axis (A1).

[0100] The shaft (118) can be supported by the shaft hole (118a). Accordingly, the shaft (118) can move up and down along the central axis (A1) and rotate around the central axis (A1).

[0101] A shaft through hole (127) may be formed in the sun gear (120) to correspond to the shaft hole (118a) and extend along the central axis (A1) to support the rotation and / or vertical movement of the shaft (118). For example, the shaft through hole (127) may be aligned along the central axis (A1) to have the same diameter as the shaft hole (118a).

[0102] The lower support member (116) may be provided to come into contact with the sun gear (120) in an up-and-down direction (or may be referred to as the 'center axis direction' or the 'shaft extension direction').

[0103] For example, the lower support member (116) can press downward on the upper part of the sun gear (120) or the center of the upper surface of the sun gear (120). Here, since the shaft through hole (127) and the shaft hole (118a) are aligned in the vertical direction, the shaft receiver (110) can support the rotation of the sun gear (120) while simultaneously reducing vibration.

[0104] The lower support member (116) can press the center of the upper surface of the sun gear (120) so that the rotation of the sun gear (120) is performed stably. For example, the lower support member (116) can press the sun gear (120) by a predetermined radius distance from the shaft hole (118a).

[0105] Additionally, to minimize friction during the rotation of the sun gear (120) and rotor (50), the shaft receiver (110) may be positioned such that the bottom surface of the shaft receiver (110), excluding the bottom support (116), is spaced upward from the top surface of the sun gear (120).

[0106] The shaft (118) can rotate and move up and down while its center is aligned along the central axis (A1) by the shaft hole (118a) and the shaft through hole (127).

[0107] That is, the shaft hole (118a) and the shaft through hole (127) can fix or support the axis of the shaft (118).

[0108] Meanwhile, the lower end of the shaft (118) can be coupled to the upper end of the screw shaft (180). The screw shaft (180) can be coupled to the needle part (200) to convert rotational motion into vertical linear motion and transmit it to the needle part (200).

[0109] The screw shaft (180) can move upward or downward while rotating along the central axis line (A1) along the screw threads formed in the holder supporter (170). Accordingly, the shaft (118) can rotate and move up and down together with the rotation and up-and-down movement of the screw shaft (180).

[0110] The above electronic expansion valve (1) may further include a rotor (50) accommodated in the inner space of the valve cover (10) and a sun gear (120) coupled to the rotor (50) and rotating.

[0111] The sun gear (120) can be arranged to be aligned along the central axis (A1) together with the shaft receiver (110). For example, the shaft receiver (110), the sun gear, and the screw shaft (180) can be arranged to be aligned sequentially along the central axis (A1).

[0112] The above-mentioned sun gear (120) includes a shaft passage hole (127) in which a shaft (118) is positioned along a central axis (A1), and can support the vertical and rotational movement of the shaft (118) through the shaft passage hole (127).

[0113] Additionally, the sun gear (120) may have an upper portion (123) that is formed to extend radially around the shaft (118) and is coupled to the rotor (50).

[0114] The upper portion (123) of the above sun gear (120) can be rotatably supported by the shaft receiver (110) from above, and the upper projection (132) of the fixed carrier (130) can be rotatably supported from below.

[0115] Meanwhile, the rotor (50) and the sun gear (120) may be positioned below the shaft receiver (110).

[0116] The stator (60) and motor housing (70), which constitute the motor part together with the rotor (50), can be detachably installed on the outer circumference of the valve cover (10). Here, the stator (60) can be positioned to correspond to the outer circumference of the rotor (50).

[0117] The rotor (50) may be positioned so as to be spaced inward from the inner surface of the valve cover (10) so as not to rub against the valve cover (10) when rotating.

[0118] Additionally, the rotor (50) can rotate together with the sun gear (120). For example, the sun gear (120) is coupled with the rotor (50) and can rotate by the same angle of rotation as the rotor (50).

[0119] The rotor (50) is a device in which magnets are embedded at regular intervals and can rotate through a magnetic field formed in a stator (60) coil installed on the outside of the valve cover (10). Accordingly, the rotor (50) can provide the force required for the up-and-down movement of a needle (250) located inside the valve seat (20) to finely control whether the flow rate passes.

[0120] A shaft passage hole (127) corresponding in the vertical direction to the hole formed in the center of the shaft receiver (110) may be formed at the center of the above-mentioned sun gear (120).

[0121] The shaft through hole (127) can be formed by extending downward along the center axis (A1) of the valve (1) from the shaft hole (118a) to have the same diameter. Thus, the sun gear (120) and the shaft receiver (110) together can accommodate the shaft (118) so that it can rotate and / or move up and down.

[0122] The sun gear (120) and the shaft receiver (110) can guide the movement of the shaft (118) while supporting the shaft (118) so that the shaft (118) rotates stably around the central axis (A1). The shaft (118) can be moved dependent on the rotation and vertical movement of the screw shaft (180) coupled to the lower end. Accordingly, vibration and noise caused by the shaft (118) can be reduced.

[0123] The above sun gear (120) may include an upper part (123) formed with an upper surface facing the shaft receiver (110) and coupled to the rotor (50), and a main body (121) extending downward along a central axis (A1) from the center of the upper part (123) and having gear teeth formed in a circumferential direction.

[0124] The upper portion (123) of the sun gear (120) may be extended radially to have a diameter larger than the diameter of the main body (121). For example, the sun gear (120) may have a 'T' shape.

[0125] The sun gear (120) can rotate together with the central axis (A1) by the rotation of the rotor (50). For example, the diameter of the upper part (123) or upper surface of the sun gear (120) can be formed to be smaller than the diameter of the shaft receiver (110). Accordingly, the sun gear (120) can be received and rotated in the inner space of the valve cover (10) while coupled to the rotor (50).

[0126] The main body (121) of the above-mentioned sun gear may have gear teeth formed along the circumferential direction around the central axis (A1) and / or shaft (118). The gear teeth of the main body (121) may be arranged so that the spin gear (135) and the orbit gear (155) mesh at the upper and lower parts of the main body (121), respectively.

[0127] The upper portion (123) of the sun gear (120) may be extended radially and coupled to the upper portion of the rotor (50). For example, the upper portion of the sun gear (120) may have an insert-calk structure that fits together with the rotor (50). Thus, the upper portion of the sun gear (120) may be easily separated from the rotor (50) when disassembly is required for configuration management.

[0128] The upper part of the sun gear (123) may include a sun coke (125) formed to protrude radially along the outer surface. For example, the sun coke (125) may have a pointed calk or a toothed shape.

[0129] The sun calk (125) may be formed in multiple numbers on the outer surface of the upper part of the sun gear (123) at predetermined intervals in the circumferential direction. For example, the multiple sun calks may be spaced equally in the circumferential direction. Additionally, the outer surface of the upper part of the sun gear (123) may have protruding and recessed portions formed in an alternating order by the sun calk (125).

[0130] Additionally, the rotor (50) may form an insert groove corresponding to the insertion of the sun coke (125). The sun gear (120) coupled with the rotor (50) may rotate by the same rotation angle as the rotor (50). Here, the rotation angle is the value obtained by multiplying the rotor rotation angle per pulse by the number of stator (60) coil pulses.

[0131] As described above, the central portion of the upper part (123) of the sun gear where the shaft through hole (127) is located may be provided to be in contact with the lower support portion (116) of the shaft receiver (110). That is, the upper part (123) of the sun gear (120) may further include a protruding surface (124) that is in contact with the lower support portion (116) and surrounds the shaft through hole (127) to define it. For example, the protruding surface (124) may be formed to protrude upward from the center of the upper surface of the upper part (123) of the sun gear to have a predetermined diameter.

[0132] The protruding surface (124) may receive pressure from the lower support member (116) and be provided with a force to support the sun gear (120) downward. Additionally, the lower support member (116) of the shaft receiver (110) may be in rotatably contact with the protruding surface (124) of the sun gear (120).

[0133] The upper part (123) of the sun gear may form an upper buffer space (128) so as to be spaced downward from the sun gear (120), excluding the area in contact with the lower support member (116). For example, the upper buffer space (128) may be defined by forming a downwardly recessed surface on the upper surface of the upper part (123). Thus, friction between the sun gear (120) and the shaft support member (110) can be minimized. In addition, the upper buffer space (128), together with the lower recessed space (129), can reduce the weight of the sun gear (120).

[0134] The upper portion (123) of the above-mentioned sun gear (120) may form a lower recessed space (129) formed by being recessed upwardly on the lower surface as well. The lower recessed space (129) may be formed on the lower surface (i.e., the lower surface of the upper portion (123)) between the outer surface where the sun cog (125) is formed and the center where the shaft passage hole (127) is formed.

[0135] The lower recessed space (129) is positioned so that at least a portion of the configuration (132) supporting the sun gear (120) from below is inserted, which is advantageous for minimizing the height or size of the electronic expansion valve (1). Additionally, the lower recessed space (128) can minimize the risk of interference with rotation or friction below the upper part (123) of the sun gear (120).

[0136] Meanwhile, the upper portion (123) of the above-mentioned sun gear (120) can be supported from below by a fixed carrier (130). For example, the bottom surface of the upper portion (123) of the above-mentioned sun gear (123) can be rotatably supported by an upper projection (132) formed on the upper surface of the fixed carrier (130).

[0137] Additionally, the sun gear (120) can transmit the input, i.e., rotational motion of the rotor (50), to the spin gear (135), ring gear (140), and orbit gear (155).

[0138] The gear teeth formed on the main body (121) of the above-mentioned sun gear (120) can be arranged to engage simultaneously with the spin gear (135) and the orbit gear (155) in the direction of the central axis (A1) or in the up and down direction.

[0139] That is, the sun gear (120) can simultaneously transmit the rotational motion (or rotational force) of the rotor (50) to the spin gear (135) and the orbit gear (155).

[0140] Here, the design values ​​(number of gear teeth and displacement coefficient) of the sun gear (120) can be applied identically without distinction between the upper and lower parts. That is, the number of gear teeth formed on the main body (121) of the sun gear (120) can be formed identically on the upper part meshing with the spin gear (135) and the lower part meshing with the orbit gear (155). Accordingly, the number of rotations of the sun gear (120) can be applied identically to the spin gear (135) and the orbit gear (155).

[0141] The electronic expansion valve (1) may further include a spin gear (135) and an orbit gear (155) that are received in the inner space of the rotor (50) and mesh with the gear teeth formed on the main body (121) of the sun gear (120).

[0142] The spin gear (135) may be positioned above the orbit gear (155). Thus, the spin gear (135) may be connected to mesh with the upper gear teeth of the sun gear body (121), and the orbit gear (155) may be connected to mesh with the lower gear teeth of the sun gear body (121).

[0143] Here, the upper gear tooth of the main body (121) and the lower gear tooth of the main body (121) are identical, integral gear teeth extending in the vertical direction, and can be understood as regions with different heights for meshing between the gears.

[0144] The spin gear (135) and orbit gear (155) can control the opening degree of the valve (1) in finer units by reducing the rotation angle received from the sun gear (120) to reduce the rotation angle of the output carrier (150). Here, the output rotation angle can be understood as the value obtained by dividing the input rotation angle by the reduction ratio.

[0145] The spin gear (135) may be provided with a plurality of spin gears spaced apart in the circumferential direction with respect to the shaft (118) or the central axis (A1). For example, the plurality of spin gears may include a first spin gear, a second spin gear spaced apart in the circumferential direction with a 120-degree gap from the first spin gear, and a third spin gear spaced apart in the circumferential direction with a 120-degree gap from the second spin gear. Here, the third spin gear will also have a 120-degree gap from the first spin gear.

[0146] The above-mentioned orbit gear (155) may be provided with a plurality of orbit gears spaced apart in the circumferential direction with respect to the shaft (118) or the central axis (A1). For example, the plurality of orbit gears may be provided with a first orbit gear, a second orbit gear spaced apart in the circumferential direction with a 120-degree gap from the first orbit gear, and a third orbit gear spaced apart in the circumferential direction with a 120-degree gap from the second orbit gear. Here, the third orbit gear will also have a 120-degree gap from the first orbit gear.

[0147] The spin gear (135) is positioned to mesh with the upper part of the sun gear (120) and the upper gear (143) of the ring gear (140), and the spin gear (135) can rotate by the rotating sun gear (120) and the rotating ring gear (140).

[0148] Additionally, the spin gear (135) can be coupled to a fixed carrier (130) and rotate. That is, the spin gear (135) can spin while maintaining a fixed position.

[0149] The vertical length (or height length) of the spin gear (135) may be formed to be smaller than the vertical length of the orbit gear (155). Specifically, the orbit gear (155) may be coupled with the output carrier (150) described later and move up and down together with rotation (rotation and revolution). Accordingly, the orbit gear (155) may be moved so as to be exposed downward from the lower gear (146) of the ring gear (150) by the vertical movement. In this case, as the exposed area of ​​the orbit gear (155) increases, the axial position for rotation of the orbit gear (155) may change, which may affect the meshing between gears or increase vibration. Therefore, the vertical length of the orbit gear (155) may be formed to be longer than the vertical length of the spin gear (135). Therefore, the orbit gear (155) can maximize the meshing area with the lower gear (146) of the ring gear (140) and the lower gear of the sun gear (120) despite vertical movement. Thus, the orbit gear (155) enables more stable rotation and vertical movement.

[0150] For the reasons mentioned above, the upper gear (141) of the ring gear that meshes with the spin gear (135) may be formed with a different vertical length from the lower gear (145) of the ring gear that meshes with the orbit gear (155).

[0151] Since the upper gear (141) and lower gear (145) of the ring gear (140) are formed to have a distance difference in the radial or horizontal direction, the spin gear (135) can have a larger diameter than the orbit gear (155).

[0152] The spin gear (135) and the orbit gear (155) may each be configured to spin. Here, the orbit gear (155) may orbit the shaft (118) or the central axis (A1) in addition to spinning.

[0153] Accordingly, the output carrier (150) having a rotational center axis (orbit gear axis) coupled with the orbit gear (155) can move up and down by a length that moves up and down along the threads of the screw axis (180) while rotating together with the revolution of the orbit gear (155).

[0154] The above electronic expansion valve (1) may further include a ring gear (140) that is received in the inner space of the rotor (50) and rotates by receiving the rotational motion of the sun gear (120) through the spin gear (135) and / or the orbit gear (155).

[0155] The ring gear (140) is formed to mesh with the spin gear (135) and the orbit gear (155) in the vertical direction and can spin by the spin gear (135) and the orbit gear (155).

[0156] The above ring gear (140) may be provided as an integrated structure in which a two-stage gear function is provided in a single body. For example, the above ring gear (140) may be provided in a cylindrical shape having a central space that is open at the top and bottom.

[0157] The spin gear (135) and the orbit gear (155) may be disposed in the inner space of the ring gear (140).

[0158] In addition, a fixed carrier (130) and an output carrier (150) may also be disposed in the inner space of the ring gear (140).

[0159] That is, the shaft (118) or central axis (A1) may be arranged so that the sun gear (120) surrounds it radially. The upper part of the body (121) of the sun gear may be arranged so that the spin gear (135) and the fixed carrier (130) surround it radially, and the lower part of the body (121) may be arranged so that the orbit gear (155) and the output carrier (150) surround it radially.

[0160] Additionally, the fixed carrier (130), output carrier (150), spin gear (135) and orbit gear (155) may be arranged so as to surround the ring gear (140) in a radial direction.

[0161] In detail, the spin gear (135) and the fixed carrier (130) are surrounded by the upper gear of the ring gear (140), and the orbit gear (155) and the output carrier (150) may be surrounded by the lower gear of the ring gear (140).

[0162] Additionally, the ring gear (140) may be arranged so that the holder (160) surrounds it in a radial direction.

[0163] Additionally, the holder (160) may be positioned so as to surround the rotor (50) in a radial direction.

[0164] If the spin gear (135) experiences vertical play or positional movement due to the vertical movement of the components coupled to the orbit gear (155) and the shaft (118), the deceleration efficiency will be reduced. In this case, the stability and reliability of the valve (1) may be affected.

[0165] Accordingly, the electronic expansion valve (1) according to an embodiment of the present invention may define a structure that combines a fixed carrier, a holder, and a holder supporter, which are non-rotating components, to prevent vertical play or positional movement of the spin gear (135). Additionally, a combined structure of the fixed carrier and the fixed carrier plate may be defined.

[0166] In this regard, the electronic expansion valve (1) may further include a fixed carrier (130) that forms a rotational center axis (A2) of the spin gear (135) to support the rotation of the spin gear (135), a holder (160) coupled to the fixed carrier (130) to support the fixed carrier (130) so that it maintains a fixed position independent of rotation, and a holder supporter (170) coupled to the lower side of the holder (160) to support the holder (160) so that it maintains a fixed position.

[0167] The fixed carrier (130) can be coupled to and fixed to the holder (160). That is, the fixed carrier (130) can maintain a fixed position despite the rotation of the rotor (50) and the spin gear (135). That is, the fixed carrier (130) can be provided in a non-rotating configuration.

[0168] The fixed carrier (130) can be positioned in an inner region corresponding to the upper gear (141) of the ring gear (140).

[0169] The fixed carrier (130) can provide an axis (A2) for the spin of the spin gear (135). That is, the fixed carrier (130) can guide the rotation of the spin gear (135) through the spin gear axes (134a, 134b, 134c).

[0170] The spin gear (135) can transmit rotational motion by rotating inwardly while engaging with the gear teeth formed on the upper part of the main body (121) of the sun gear (120) around the spin gear shaft (134a, 134b, 134c), and simultaneously rotating outwardly while engaging with the gear teeth of the upper gear (141) of the ring gear (140).

[0171] Additionally, a fixed carrier plate (139) may be attached to the bottom of the fixed carrier (130) to prevent vertical play or movement of the spin gear shafts (134a, 134b, 134c). For example, the fixed carrier plate (139) may have a disc shape with a hole formed in the center.

[0172] Additionally, the fixed carrier plate (139) can be pressed upward by a coupling member (136a, 136b) coupled to the lower end of the fixed carrier (130), that is, the lower end of the spin gear shaft (134a, 134b, 134c) and / or the lower end of the support shaft (137a, 137b, 137c), thereby supporting the spin gear (135) to spin stably on the fixed carrier (130).

[0173] The fixed carrier (130) can be rotatably supported by making point contact with the lower surface of the upper part of the sun gear (120). That is, the sun gear (120) can be rotatably supported by the fixed carrier (130) from below and rotatably supported by the shaft receiver (110) from above.

[0174] On the outer surface of the fixed carrier (130), a protruding end (133a) formed to protrude radially and a recessed end (133b) formed to be recessed toward the central axis (A1) may be formed. Additionally, the protruding end (133a) and the recessed end (133b) may be provided in multiple numbers that are sequentially arranged in an alternating pattern along the circumferential direction with respect to the central axis (A1).

[0175] The above fixed carrier (130) can form a sun gear passage hole (131) that is open in the vertical direction at the center.

[0176] The above protrusion (133a) can form the outermost edge (radially outermost end) of the fixed carrier (130).

[0177] The upper projection (132) formed on the upper surface of the fixed carrier (130) may be located between the sun gear passage hole (131) and the protruding end (133a).

[0178] Meanwhile, the detailed structure of the fixed carrier (130) and the fixed carrier plate (139) will be described in detail with reference to FIGS. 6 and FIGS. 7.

[0179] The above holder (160) may have a cylindrical shape that is open in the vertical direction.

[0180] The holder (160) may be formed to surround the aforementioned ring gear (140) in a radial direction. That is, the holder (160) may define a ring gear receiving space (161) that is open in the vertical direction. The ring gear (140), a fixed carrier (130), and an output carrier (150) may be disposed in the ring gear receiving space (161).

[0181] A support groove (165) that guides coupling with the fixed carrier (130) may be formed at the upper portion of the holder (160). The support groove (165) may be formed at predetermined intervals along the circumferential direction with respect to the central axis (A1).

[0182] The protruding end (133a) of the fixed carrier (130) can be inserted into and coupled to the support groove (165). That is, the support groove (165) and the protruding end (133a) may have shapes that fit together. Meanwhile, it may also be possible to form the support groove (165) and the protruding end (133a) in opposite positions. Accordingly, the fixed carrier (130) can be stably coupled and / or fixed by the holder (160).

[0183] An insertion end (166) that is inserted into and coupled to the recessed end (133b) of the fixed carrier (130) may be formed at the upper end of the holder (160). That is, the support groove (165) is formed by being recessed or cut downward, and the insertion end (166) may be formed to protrude upward relative to the support groove (165).

[0184] The above support groove (165) and insertion end (166) may be provided in multiple numbers that are sequentially arranged in an alternating pattern along the circumferential direction with respect to the central axis (A1).

[0185] Additionally, the holder (160) may be coupled to the holder supporter (170). Specifically, a flange seating portion (168) may be formed at the lower end of the holder (160). For example, the flange seating portion (168) can be understood as a portion coupled to the flange (172) of the holder supporter (170). When the flange seating portion (168) is inserted into and / or coupled to the flange (172), a portion of the inner surface of the holder may be in close contact with the upper outer surface (171) of the holder supporter (170).

[0186] The holder supporter (170) may be provided to fix and support the holder (160). Additionally, the holder supporter (170) may be coupled and fixed to the valve seat (20).

[0187] Accordingly, the holder supporter (170) can support the holder (160) so that it is stably maintained in a fixed position.

[0188] A flange (172) may be formed on the outer surface of the holder supporter (170) to guide the holder (160) to be coupled. The flange (172) may protrude further in the radial direction than the upper outer surface of the holder supporter (170) so that the lower end of the holder (160) is seated thereon.

[0189] The above holder supporter (170) can form a carrier receiving space (176) in which an output carrier (150) that rotates and moves up and down around a central axis (A1) by means of an inner circumference is received.

[0190] Additionally, the holder supporter (170) may include a supporter bottom surface (177) that defines the bottom of the carrier receiving space (176).

[0191] Additionally, the holder supporter (170) may form a screw shaft insertion hole (179) that is open in the vertical direction at the center of the bottom surface (177) or the center of the carrier receiving space (176).

[0192] The above screw shaft insertion hole (179) may form a screw thread (179a) along its inner surface. Accordingly, the screw shaft (180) can move up and down while being rotated inserted or rotated withdrawn along the screw thread (179a).

[0193] The above screw shaft insertion hole (179) can be defined by a protruding guide (178) that is formed to protrude upward with a predetermined diameter from the bottom surface (177) of the holder supporter (170).

[0194] That is, the protruding guide (178) is located at the center of the carrier receiving space (176) and can be formed to protrude upward above the supporter bottom surface (177).

[0195] Additionally, the protruding guide (178) can be formed to surround the screw shaft insertion hole (179).

[0196] According to the above protruding guide (178), the bottom surface of the supporter (177) may not come into contact with the output carrier (150). Therefore, this may be advantageous in terms of product stability and reliability of the electronic expansion valve (1) installed in various directions.

[0197] Here, the protruding guide (178) can perform the function of a stopper at the maximum lowering point of the output carrier (150).

[0198] The holder supporter (170) may have a bowl shape.

[0199] The holder supporter (170) can form a body (171, 173). For example, the body (171, 173) may include a flange (172) that protrudes most radially from the central axis (A1) or screw axis (180) or has the largest outer diameter among the outer surfaces of the body.

[0200] The upper outer surface (171) of the body may be formed to have an outer diameter smaller than that of the flange (172). Accordingly, the lower end of the holder (160) can be seated and coupled to the flange (172). Additionally, the lower part of the inner surface of the holder (160) may be coupled to the upper outer surface (171) of the body in a state of close contact or abutment.

[0201] Additionally, the holder supporter (170) can be inserted and seated on the valve seat (20) by means of the flange (172) structure.

[0202] That is, the lower outer surface (173) of the body of the holder supporter (170) is located lower than the flange (172) and can be formed to have a smaller outer diameter than the upper outer surface (171) of the body.

[0203] The lower outer surface (173) of the body can be positioned above the spindle (220) and / or spindle receiver (230) by being inserted and coupled together with the bottom surface (174) of the holder supporter (170) into the inner space (22) of the valve seat (20). For example, the lower outer surface (173) and the bottom surface (174) of the body can be coupled to be inserted and / or seated in the supporter seating groove (27) of the valve seat (20).

[0204] The bottom surface of the holder supporter (170) can provide a fixing force so that the spindle (220) and / or spindle receiver (230) does not bounce upward due to elasticity.

[0205] The holder supporter (170) may further include a rotation guide (175) formed in a shape that corresponds to a lower rotating part for rotation of the ring gear (140).

[0206] For example, the rotation guide (175) may have a vertical cross-section in the shape of a 'V' and extend in the circumferential direction. Accordingly, the lower rotating part of the ring gear can be inserted into the rotation guide (175) to stably support the spin of the ring gear (140).

[0207] Meanwhile, the fixed carrier (130) may also come into contact with the ring gear (140) to guide or support the rotation ('rotation') of the ring gear (140). That is, the fixed carrier (130) may have a guide structure corresponding to the rotation guide (175) described above so that the upper end of the ring gear (140) rotates stably.

[0208] The above electronic expansion valve (1) may further include an output carrier (150) that forms an orbital gear shaft (154), which is the rotational center axis (A3) of the orbital gear (155), and rotates together with the rotation and / or revolution of the orbital gear (155).

[0209] Additionally, the output carrier (150) is coupled with the orbit gear (155) and can move up and down along the vertical guide of the screw shaft (180) while rotating (i.e., rotating) together with the rotation of the orbit gear (155). That is, the orbit gear (155), output carrier (150), and screw shaft (180) can be understood as being configured to move up and down together with rotation.

[0210] The output carrier (150) can be positioned in an inner region corresponding to the lower gear (146) of the ring gear (140).

[0211] Additionally, the output carrier (150) can form an orbit gear shaft (154) which is a rotational center axis (A3) for the spin of the orbit gear (155). In other words, the output carrier (150) can guide the spin of the orbit gear (155) through the orbit gear shaft (154).

[0212] The output carrier (150) may have a screw shaft passage hole (151) that is open vertically at the center to allow the screw shaft (180) to be coupled. For example, the output carrier (150) may have a cylindrical or disc shape with an open center.

[0213] Additionally, the orbital gear shaft (154) can be formed by extending upward from the lower part of the output carrier (150) to have a predetermined diameter.

[0214] The above orbit gear (155) can rotate by engaging inwardly with the gear teeth formed on the lower part of the main body (121) of the sun gear (120) around the orbit gear shaft (154), and simultaneously engaging outwardly with the gear teeth of the lower gear (146) of the ring gear (140). Here, the 'rotation' of the orbit gear (155) can be understood to include both spin and orbit.

[0215] That is, the orbit gear (155) can transmit the rotational motion of the sun gear (120) to the output carrier (155) by spinning around the orbit gear shaft (154) and orbiting around the central axis line (A1).

[0216] The electronic expansion valve (1) may further include an output carrier plate (159) coupled to the top of the output carrier (150) to support the orbital gear shaft (154).

[0217] The output carrier plate (159) may have a disc shape with a center that is open in the vertical direction. For example, the output carrier plate (159) may be formed to correspond to the lower shape of the output carrier (150).

[0218] Additionally, the output carrier plate (159) is pressed downward by a coupling member (156a, 156b) coupled to the upper part of the output carrier (150), that is, the upper part of the orbit gear shaft (154) and / or the output support shaft (156), thereby preventing play despite the up-and-down movement of the orbit gear (155) and supporting it to rotate stably (including rotation and revolution) on the output carrier (150).

[0219] Meanwhile, the detailed structure of the output carrier (150) and the output carrier plate (159) will be described in detail with reference to FIGS. 8 and FIGS. 9.

[0220] The above electronic expansion valve (1) may further include a screw shaft (180) coupled to the lower end of the shaft (118) and configured to rotate and move up and down.

[0221] The lower end of the shaft (118) can be connected to the upper end of the screw shaft (180).

[0222] The screw shaft (180) may be coupled to a screw shaft through hole (151) formed at the center of the output carrier (150) and configured to rotate together with the rotation of the output carrier (150).

[0223] Additionally, the screw shaft (180) can be inserted into the screw shaft through hole (151) and the screw shaft insertion hole (179) so as to be aligned around the central axis line (A1). Additionally, the screw shaft (180) can rotate and move up and down along the screw thread (179a) formed in the screw shaft insertion hole (179).

[0224] Accordingly, the screw shaft (180) rotates together with the output carrier (150) due to the rotation (i.e., rotation) of the output carrier (150) and moves up and down along the screw thread (179a), so the output carrier (150) can also move up and down. That is, when the output carrier (150) and the orbit gear (155) rotate, the screw shaft (180) coupled to the lower part of the output carrier (150) rotates together, and since the screw shaft (180) rotates along the screw thread formed on the holder supporter (170), it moves in the up and down direction. Accordingly, the output carrier (150) and the orbit gear (155) coupled to the screw shaft (180) can move up and down due to the up and down movement of the screw shaft (180).

[0225] Meanwhile, a ball (185) providing a contact point for converting rotational motion into vertical linear motion may be provided at the lower end of the screw shaft (180). For example, the ball (185) may have an integrated structure with the screw shaft (180) by point welding.

[0226] When the screw shaft (180) moves downward, the ball (185) presses the ball receiver (210), which will be described later, downward while rotating in place. That is, rotational motion can be converted into linear motion by utilizing the characteristics of the ball (185). Accordingly, the spindle (220) and needle (250) coupled with the ball receiver (210) can also move downward.

[0227] That is, the ball (185) can convert the rotation angle of the output carrier (150) into vertical movement through a screw thread structure. Additionally, since the ball (185) makes point contact with the ball receiver (210), only the converted vertical movement can be transmitted to the needle part (200) connected to the screw shaft (180).

[0228] The electronic expansion valve (1) may include a ball receiver (210) that is received in the inner space of the valve seat (20) and contacts a ball (185) coupled to the screw shaft (180), a spindle (220) that is coupled to the ball receiver (210) and is configured to move up and down together with the ball receiver (210), a spindle receiver (230) that surrounds the outer circumference of the spindle (220), and an elastic member (240) that is arranged along the outer circumference of the spindle receiver (230).

[0229] The elastic member (240) is positioned to be received in the inner space (22) of the valve seat (20) together with the spindle receiver (230) and can be positioned below the bottom surface (174) of the holder supporter (170).

[0230] That is, the elastic member (240) and the spindle receiver (230) can maintain their position in the inner space of the valve seat (20) even when an upward elastic force is applied by the bottom surface of the holder supporter (170) inserted and fixed to the valve seat (20).

[0231] For example, when the spindle (220) is pressed downward by the ball (185), the spindle receiver (230) can press the needle (250) downward together with the spindle (220). At this time, the elastic member (240) is pressed downward by the upper end of the spindle receiver (230) and can provide an upward elastic force.

[0232] That is, the elastic member (240) can provide elastic force to the needle (250), which moves up and down dependently by the up and down movement of the screw shaft (180). For example, the elastic member (240) may include a spring.

[0233] The electronic expansion valve (1) may further include a needle (250) coupled to the spindle (220) and / or spindle receiver (230) to move up and down along the up and down movement of the screw shaft (180) and to control the flow rate of the fluid passing through the first and second tubes (31, 32).

[0234] Meanwhile, the shaft receiver (110), shaft (118), sun gear (120), fixed carrier (130), spin gear (135), fixed carrier plate (139), ring gear (140), output carrier plate (159), orbit gear (155), output carrier (150), holder (160), screw shaft (180) and holder supporter (170) described above can be named as ‘gear part (100)’.

[0235] Additionally, the ball receiver (210), spindle (220), spindle receiver (230), elastic member (240), and needle (250) described above can be named the ‘needle part (200)’.

[0236] Additionally, the fixed carrier (130), holder (160), and holder supporter (170) can be understood as supporting the rotatable components of the present invention by maintaining a non-rotating and fixed position through mutual coupling.

[0237] FIG. 6 is a perspective view showing a fixed carrier of an electronic expansion valve according to an embodiment of the present invention, and FIG. 7 is a perspective view showing the combined appearance of a fixed carrier and a fixed carrier plate of an electronic expansion valve according to an embodiment of the present invention.

[0238] Referring to FIGS. 6 and FIGS. 7, the fixed carrier (130) may include a spin gear shaft (134) that forms the rotation axis of the spin gear (135) and supports and / or guides the spin of the spin gear (135).

[0239] The spin gear (135) may include a first spin gear (1351), a second spin gear (1352), and a third spin gear (1353) spaced apart in the circumferential direction with respect to the shaft (118) or the central axis (A1).

[0240] The spin gear shaft (134) may include a first spin gear shaft (134a) providing a rotational center axis of the first spin gear (1351), a second spin gear shaft (134b) providing a rotational center axis of the second spin gear (1352), and a third spin gear shaft (134c) providing a rotational center axis of the third spin gear (1353).

[0241] The first to third spin gear shafts (134a, 134b, 134c) may be spaced apart along the circumferential direction with respect to the central axis line (A1) at intervals of 120 degrees from each other. Accordingly, the first to third spin gears (1351, 1352, 1353) may also be spaced apart along the circumferential direction with the same 120-degree interval.

[0242] The above fixed carrier (130) can form a sun gear passage hole (131) that is open in the vertical direction at the center.

[0243] The above sun gear through hole (131) can be maintained even when the above fixed carrier plate (139) is coupled. That is, the above fixed carrier plate (139) may be provided with a hole formed in the center corresponding to the sun gear through hole (131) so that the main body (121) of the sun gear (120) can be inserted or pass through. For example, the fixed carrier plate (139) may have a disc shape with an open center.

[0244] In addition, the combined state of the fixed carrier (130) and the fixed carrier plate (139) may have a cylindrical shape with the center open in the vertical direction.

[0245] Additionally, the sun gear (120) can be inserted to pass through the sun gear through hole (131) and connected so that the gear teeth of the spin gear (135) and the main body (121) of the sun gear mesh with each other.

[0246] When the main body (121) of the sun gear (120) is positioned at the center of the fixed carrier (130) by passing through the sun gear through hole (131), the upper projection (132) of the fixed carrier (130) can rotatably support the upper part (123) of the sun gear (120) from below.

[0247] Additionally, the fixed carrier (130) may include a protruding end (133a) that is formed to protrude radially along the upper outer surface by a predetermined arc length and is inserted into and / or coupled to a support groove (165) formed at the top of the holder (160).

[0248] The above protruding end (133a) may have a shape that fits into the support groove (165).

[0249] The above protrusions (133a) may be provided in multiple numbers with a predetermined spacing in the circumferential direction around the central axis (A1).

[0250] A recessed section (133b) may be formed between two adjacent protruding sections (133a) among the plurality of protruding sections (133a). For example, the recessed section (133b) may be formed to have a smaller radius with respect to the central axis (A1) than the protruding section (133a).

[0251] An insertion portion (166) formed between two adjacent support grooves (165) among a plurality of support grooves (165) on the top of the holder (160) may be inserted and / or coupled to the above-mentioned recess (133b).

[0252] Additionally, the protruding end (133a) and the recessed end (133b) may be formed in an intersecting order along the circumferential direction. Correspondingly, the support groove (165) and the insertion end (166) of the holder (160) may also be formed in an intersecting order along the circumferential direction.

[0253] Accordingly, the holder (160) and the fixed carrier (130) can be stably fixed by the connection between the support groove (165) and the protruding end (133a) and / or the connection between the recessed end (133b) and the insertion end (166).

[0254] The fixed carrier (130) may include an upper projection (132) for supporting the rotation of the sun gear (120) by making point contact with the upper part of the sun gear (120).

[0255] The upper projection (132) may have a hemispherical shape.

[0256] The upper projection (132) is provided such that its highest point contacts the bottom or lower surface of the upper part (123) of the sun gear (120), thereby minimizing friction caused by the rotation of the sun gear (120) and supporting the rotation of the sun gear (120) from below.

[0257] The upper projection (132) may be formed corresponding to the position of the spin gear shafts (134a, 134b, 134c). For example, the upper projection (132) may protrude convexly upward from the upper surface of the fixed carrier (130) along the vertical extension direction of the spin gear shafts (134a, 134b, 134c).

[0258] The upper projection (132) may include a first upper projection (132a) extending upward from the first spin gear shaft (134a), a second upper projection (132b) extending upward from the second spin gear shaft (134b), and a third upper projection (132c) extending upward from the third spin gear shaft (134c).

[0259] Here, the first to third upper protrusions (132a, 132b, 132c) can be arranged to form an angle of 120 degrees with respect to the center of the sun gear through hole (131), that is, the center axis line (A1). Thus, the sun gear (120) can be stably pressed or supported, while at the same time the frictional resistance to the rotation of the sun gear (120) can be minimized.

[0260] The first to third spin gear shafts (134a, 134b, 134c) can be formed to extend downward by the same length to the disc-shaped bottom of the fixed carrier (130).

[0261] The fixed carrier plate (139) may be coupled to the protruding lower end of the fixed carrier (130), that is, to the lower end of the first to third spin gear shafts (134a, 134b, 134c), to provide a fixing force in the vertical direction so that the spin gears (1351, 1352, 1353) coupled to the spin gear shafts (134a, 134b, 134c) respectively rotate stably.

[0262] As described above, the fixed carrier plate (139) can be formed to have a shape corresponding to the upper part of the fixed carrier (130). For example, if the upper part of the fixed carrier (130) has a circular shape with an open center (131), the fixed carrier plate (139) can also have a circular shape with an open center.

[0263] That is, corresponding to the sun gear pass hole (131) at the center of the fixed plate (130), the fixed carrier plate (139) can form a communication hole (1311) corresponding to the position where the sun gear pass hole (131) extends along the central axis (A1).

[0264] Accordingly, the fixed carrier plate (139) combined with the fixed carrier (130) has an overall cylindrical shape and can form an upper plate and a lower plate, respectively. It can also be understood that spin gears (1351, 1352, 1353) are rotatably coupled between the upper plate and the lower plate.

[0265] That is, the fixed carrier (130) may be provided with a disc-shaped upper portion and a disc-shaped fixed carrier plate (139) to stably support rotation on the upper and lower sides of the spin gear (135) so that the spin gear (135) can spin stably.

[0266] Additionally, the fixed carrier plate (139) may form a hole or groove at a position corresponding vertically to the lower end of the spin gear shaft (134a, 134b, 134c). Accordingly, the fixed carrier plate (139) may be provided to be inserted or fitted into the lower end of the spin gear shaft (134a, 134b, 134c).

[0267] In order to stably support the spin gears (1351, 1352, 1353) below the spin gear shafts (134a, 134b, 134c), the fixed carrier (130) may further include a coupling member (136a) that is inserted into the lower end of the spin gear shafts (134a, 134b, 134c) or coupled to provide upward pressure.

[0268] The coupling member (136a) can press the bottom surface of the fixed carrier plate (139) upward to fix the fixed carrier plate (139) to the fixed carrier (130). For example, the coupling member (136a) can be coupled to the spin gear shaft (134) by moving to press upward while the fixed carrier plate (139) is fitted to the bottom of the spin gear shaft (134).

[0269] The fixed carrier (130) may further include support shafts (137a, 137b, 137c) formed between a plurality of spin gear shafts (134a, 134b, 134c) arranged circumferentially to guide a more stable coupling of the fixed carrier plate (139) and to provide more robust support for the spin gear (135) in the vertical direction.

[0270] The support shafts (137a, 137b, 137c) may have a volume that does not interfere with the rotation of the spin gear (135). For example, the support shafts (137a, 137b, 137c) may be positioned between the first spin gear (1351) and the second spin gear (1352) and may be positioned so as to be spaced apart from the first spin gear (1351) and the second spin gear (1352) in the circumferential direction.

[0271] The above support shafts (137a, 137b, 137c) can be formed by extending downward from the upper surface of the fixed carrier (130) to have a predetermined thickness and arc length.

[0272] Additionally, the support shafts (137a, 137b, 137c) can be formed such that the arc length close to the central axis line (A1) is short.

[0273] For example, the support shafts (137a, 137b, 137c) may include a first support shaft (137a) formed between the first spin gear (1351) and the second spin gear (1352), a second support shaft (137b) formed between the second spin gear (1352) and the third spin gear (1353), and a third support shaft (137c) formed between the third spin gear (1353) and the first spin gear (1351).

[0274] Additionally, the fixed carrier (130) may further include an axial coupling member (136b) corresponding to each of the support shafts (137a, 137b, 137c) to stably connect the fixed carrier plate (139).

[0275] For example, the shaft coupling member (136b) may include a first shaft coupling member coupled to the bottom surface of the first support shaft (137a) to press the fixed carrier plate (139) upward, a second shaft coupling member coupled to the bottom surface of the second support shaft (137b) to press the fixed carrier plate (139) upward, and a third shaft coupling member coupled to the bottom surface of the third support shaft (137c) to press the fixed carrier plate (139) upward.

[0276] The fixed carrier plate (139) may be inserted or fitted into the lower ends of the first to third support shafts (137a, 137b, 137c) by forming a groove or hole at a position corresponding to the lower ends of the first to third support shafts (137a, 137b, 137c). Accordingly, the connection of the fixed carrier plate (139) may be more stable.

[0277] The above-mentioned shaft coupling member (136b) may be formed in the same way as the above-mentioned coupling member (136a).

[0278] The shaft coupling member (136b) that is respectively coupled to the first to third support shafts (137a, 137b, 137c) to form a fixed carrier plate (139) and the coupling member (136a) that is respectively coupled to the first to third spin gear shafts (134a, 134b, 134c) to form a fixed carrier plate (139) may be spaced apart in the circumferential direction with respect to the mutual center axis line (A1).

[0279] With the fixed carrier plate (139) coupled to the fixed carrier (130), the virtual circle (C1) connecting the midpoints of the coupling member (136a) and the shaft coupling member (136b) may have a diameter larger than the outer diameter of the sun gear through hole (131) and the communication hole (1311).

[0280] The virtual circle (C1) may have the same diameter as the virtual circle connecting the rotational center axes formed by the plurality of spin gears (1351, 1352, 1353). Additionally, the virtual circle (C1) may have the same diameter as the virtual circle connecting the highest points of the plurality of upper protrusions (132a, 132b, 132c).

[0281] Ultimately, the fixed carrier plate (139) is coupled to the bottom surface of the fixed carrier (130) to provide upward and downward pressure to the spin gear (135). That is, the fixed carrier (130) can provide a fixing force.

[0282] Accordingly, the spin gear (135) can be prevented from moving up or down by the fixed carrier (130) and the fixed carrier plate (139).

[0283] FIG. 8 is a perspective view showing an output carrier of an electronic expansion valve according to an embodiment of the present invention, and FIG. 9 is a perspective view showing the combined appearance of an output carrier and an output carrier plate of an electronic expansion valve according to an embodiment of the present invention.

[0284] Referring to FIGS. 8 and 9, the output carrier (150) may include an orbital gear shaft (154) that forms the rotational center axis of the orbital gear (155).

[0285] The above orbital gear shaft (154) may include first to third orbital gear shafts (154a, 154b, 154c) spaced apart in the circumferential direction to have 120 degrees with respect to the center axis line (A1).

[0286] For example, the above orbit gear shafts (154a, 154b, 154c) may include a first orbit gear shaft (154a) providing a rotational center axis of the first orbit gear (1551), a second orbit gear shaft (154b) providing a rotational center axis of the second orbit gear (1552), and a third orbit gear shaft (154c) providing a rotational center axis of the third orbit gear (1553).

[0287] The above orbital gear shafts (154a, 154b, 154c) can be formed to extend upward from the upper surface of the lower part of the output carrier (150) to have a predetermined diameter.

[0288] For example, the first to third orbital gear shafts (154a, 154b, 154c) can be extended upward to have the same height.

[0289] Meanwhile, the output carrier (150) may have an output carrier plate (159) attached to its top for stable rotational movement of the orbit gear (155).

[0290] To this end, the output carrier (130) may further include an output coupling member (156a) for pressing and fixing the output carrier plate (159) downward.

[0291] The output coupling member (156a) may include a first output coupling member inserted and / or coupled to the upper end of the first orbital gear shaft (154a) to press the output carrier plate (159) downward, a second output coupling member inserted and / or coupled to the upper end of the second orbital gear shaft (154b) to press the output carrier plate (159) downward, and a third output coupling member inserted and / or coupled to the upper end of the third orbital gear shaft (154c) to press the output carrier plate (159) downward.

[0292] The output carrier plate (159) may form grooves or holes at positions corresponding to the first to third orbital gear shafts (154a, 154b, 154c). Accordingly, the output carrier plate (159) may be inserted or fitted into the top of the first to third orbital gear shafts (154a, 154b, 154c) and may be fixed by the output coupling member (156a).

[0293] The output carrier plate (159) may have a shape corresponding to the lower part of the output carrier (150). For example, the output carrier plate (159) may have a circular shape with a center that is open at the top and bottom.

[0294] Accordingly, even when the output carrier plate (159) is coupled with the output carrier (150), the sun gear (120) and screw shaft (180) can be positioned so as to be rotatable at the center of the output carrier along the central axis line (A1).

[0295] The output carrier (150) may form a screw shaft passage hole (151) in the center to which a screw shaft (180) coupled with a shaft (118) is coupled.

[0296] An output communication hole (1511) may be formed in the center of the output carrier plate (159), which is open at a position corresponding to the screw shaft passage hole (151) in the vertical direction. Accordingly, the sun gear (120) and shaft (118) are positioned to be inserted along the central axis line (A1) by passing through the output communication hole (1511), and the screw shaft (180) coupled to the lower end of the shaft (118) is coupled to the screw shaft passage hole (151) so that it can be aligned vertically along the central axis line (A1) together with the shaft (118).

[0297] The output carrier (150) may further include output support shafts (157a, 157b, 157c) formed between the orbital gear shafts (154a, 154b, 154c) in the circumferential direction to guide a more stable coupling of the output carrier plate (159) and to firmly support the orbital gear (155).

[0298] The output support shafts (157a, 157b, 157c) may have a volume that does not interfere with the rotation of the orbit gear (155). For example, the output support shafts (157a, 157b, 157c) may be positioned between the first orbit gear shaft (154a) and the second orbit gear shaft (154b) and may be positioned so as to be spaced apart from the first orbit gear (1551) and the second orbit gear (1552) in the circumferential direction.

[0299] The output support shafts (157a, 157b, 157c) can be formed by extending upward on the lower surface of the output carrier (150) to have a predetermined thickness and arc length.

[0300] Additionally, the output support shafts (157a, 157b, 157c) can be formed such that the arc length close to the center axis (A1) is short.

[0301] In addition, the outer surface of the output support shaft (157a, 157b, 157c) can have the same outer diameter as the outer surface of the output carrier (150), that is, form a single surface.

[0302] The output support shafts (157a, 157b, 157c) may include a first output support shaft (157a) formed between the first orbit gear (1551) and the second orbit gear (1552), a second output support shaft (157b) formed between the second orbit gear (1552) and the third orbit gear (1553), and a third output support shaft (157c) formed between the third orbit gear (1553) and the first orbit gear (1551).

[0303] Additionally, the output carrier (150) may further include an output shaft coupling member (156b) that is coupled to the upper end of the output support shafts (157a, 157b, 157c) and inserted and / or coupled to press the output carrier plate (159) downward.

[0304] The output shaft coupling member (156b) can be formed in the same way as the output coupling member (156a).

[0305] As described above, the output carrier (150) may have a screw shaft coupling hole (151) formed at the center that is open at the top and bottom. For example, the upper end of the screw shaft (180) may be coupled to the screw shaft coupling hole (151) and positioned in an inserted state. Accordingly, the screw shaft (180) can be coupled to the output carrier (150).

[0306] As described above, the upper gear (143) and lower gear (146), which are formed vertically spaced apart on the inner circumference of the ring gear (140), can be formed to have different radii from the center axis (A1) of the electronic expansion valve. That is, the horizontal distance between the upper gear (143) of the ring gear (140) and the center axis of the electronic expansion valve can be formed to be longer than the horizontal distance between the lower gear (146) of the ring gear (140) and the center axis of the electronic expansion valve.

[0307] Accordingly, the rotational center axis of the spin gear (135) formed along the spin gear axis (134) may be located radially further from the center axis line (A1) of the electronic expansion valve (1) or the center axis of the shaft (118) than the rotational center axis of the orbit gear (155) formed along the orbit gear axis (154).

[0308] The output coupling member (156a) coupled to support the output carrier plate (159) on the upper end of the above-mentioned orbital gear shaft (154) and the output shaft coupling member (156b) coupled to support the output carrier plate (159) on the upper end of the above-mentioned output support shaft (157) may be spaced apart in the circumferential direction with respect to the mutual center axis line (A1).

[0309] By means of the output carrier (150) and the output carrier plate (159), the orbit gear (155) can be pressed to be stably rotated and supported in the up and down direction. Accordingly, the orbit gear (155) can prevent play despite rotation (including rotation and revolution) and up and down movement, and can be stably coupled and supported to the output carrier (150).

[0310] Additionally, when the output carrier plate (159) is coupled to the output carrier (150), the virtual circle (C2) connecting the midpoint of the output coupling member (156a) and the output shaft coupling member (156b) may have a diameter larger than the outer diameter of the screw through hole (151) and the output communication hole (1511) formed corresponding to the screw through hole.

[0311] The above virtual circle (C2) may have the same diameter as the virtual circle connecting the rotational center axes formed by a plurality of orbital gears (1551, 1552, 1553).

[0312] Additionally, the virtual circle (C2) may have the same diameter as the virtual circle connecting the highest points of the plurality of upper protrusions (132a, 132b, 132c).

[0313] The virtual circle (C1) of the fixed carrier plate (139) may be positioned to face the virtual circle (C2) of the output carrier plate (159). In this case, the diameter of the virtual circle (C1) of the fixed carrier plate (139) may be formed to be larger than the diameter of the virtual circle (C2) of the output carrier plate (159).

[0314] Meanwhile, the spin gear (135) may be named the “first planet gear,” and the orbit gear (155) may be named the “second planet gear.” Additionally, the spin gear shaft (134) may be named the “first planet gear shaft,” and the orbit gear shaft (154) may be named the “second planet gear shaft.”

Claims

1. A sun gear coupled with a rotor and rotating about a central axis; A spin gear connected to mesh with a gear tooth formed on the main body of the above-mentioned sun gear; A non-rotating fixed carrier having a spin gear shaft that supports the spin gear; An orbital gear connected to mesh with a gear tooth formed on the body of the sun gear at the lower side of the spin gear; An output carrier having an orbital gear shaft that supports the above orbital gear, and which rotates as the above orbital gear revolves around the central axis; A screw shaft coupled along the central axis to the center of the output carrier; A needle part that moves up and down to control the opening degree of the pipe by the above screw shaft; A valve seat that accommodates the above needle portion and to which the above pipe is connected; A holder supporter coupled to the valve seat and having threads that guide the screw shaft to rotate and move up and down about the central axis; and It includes a holder coupled to the above-mentioned holder supporter, and The above fixed carrier is an electronic expansion valve coupled to the top of the holder.

2. In Paragraph 1, An electronic expansion valve further comprising a fixed carrier plate positioned at the bottom of the spin gear to prevent play or movement in the vertical direction of the spin gear and coupled with the bottom of the fixed carrier.

3. In Paragraph 1, It further includes a ring gear in which an upper gear formed on the upper part of the inner surface meshes with the spin gear, and a lower gear formed on the lower part of the inner surface meshes with the orbit gear. The inner surface of the ring gear is formed to surround the spin gear and the orbit gear in the radial direction, forming an electronic expansion valve.

4. In Paragraph 1, The upper outer surface of the fixed carrier and the upper portion of the holder form corresponding protruding ends and support grooves to have mutually mating shapes, and An electronic expansion valve in which the above-mentioned protruding end is inserted into and coupled with the above-mentioned support groove, and the above-mentioned fixed carrier is fixed by the above-mentioned holder.

5. In Paragraph 4, The above protruding end is formed to protrude radially along the upper outer surface of the fixed carrier, and The above support groove is formed by being recessed downward from the top of the holder so that the above protruding end is inserted and coupled to the electronic expansion valve.

6. In Paragraph 5, On the upper outer surface of the above fixed carrier, A recessed portion is formed that is recessed in the direction of the central axis more than the protruding portion above to guide the coupling of the holder, and An electronic expansion valve in which the above-mentioned recessed end and the above-mentioned protruding end are arranged in an order that intersects each other along the circumferential direction.

7. In Paragraph 1, The above holder forms a flange seating portion at its lower end so as to be seated on a flange that protrudes from the outer circumference of the holder supporter. An electronic expansion valve in which the flange seating end of the holder is joined to the flange of the holder supporter.

8. In Paragraph 2, An electronic expansion valve in which the fixed carrier and the fixed carrier plate have a ring shape so as to be aligned along a central axis (A1).

9. In Paragraph 2, The spin gear comprises a first spin gear, a second spin gear, and a third spin gear spaced apart at intervals of 120 degrees in the circumferential direction with respect to the central axis (A1). The above spin gear shaft comprises a first spin gear shaft providing a rotational center axis of the first spin gear, a second spin gear shaft providing a rotational center axis of the second spin gear, and a third spin gear shaft providing a rotational center axis of the third spin gear, forming an electronic expansion valve.

10. In Paragraph 2, The above fixed carrier is an electronic expansion valve that pressurizes the disc-shaped upper portion and the disc-shaped fixed carrier plate to support rotation on the upper and lower sides of the spin gear so that the spin gear spins stably.

11. In Paragraph 2, The above fixed carrier plate forms a hole or groove at a position corresponding to the upper and lower ends of the spin gear shaft, and The hole or groove of the fixed carrier plate above is an electronic expansion valve into which the lower end of the spin gear shaft is inserted or fitted.

12. In Paragraph 2, The above fixed carrier is, An electronic expansion valve further comprising a support shaft formed between a plurality of spin gear shafts arranged circumferentially to guide coupling with the fixed carrier plate and to provide more robust vertical support for the spin gear.

13. In Paragraph 12, An electronic expansion valve in which, when a fixed carrier plate is coupled to the fixed carrier, a virtual circle (C1) connecting the respective midpoints of a coupling member inserted into the spin gear shaft and a shaft coupling member inserted into the support shaft to couple the fixed carrier plate has a diameter larger than the outer diameter of the hole through which the sun gear passes.

14. In Paragraph 1, The above output carrier is an electronic expansion valve in which an output carrier plate is coupled to the top to support the rotational movement of the above orbital gear from top to bottom.

15. In Paragraph 14, An electronic expansion valve further comprising an output coupling member coupled to the upper end of the orbital gear shaft for pressing the output carrier plate downward.

Images