Electronic expansion valve for heating and cooling systems

Abstract

The present invention relates to an electronic expansion valve, and more particularly to an electronic expansion valve for a heating and cooling system in which the refrigerant discharged during expansion and bypass is discharged through a single outlet, and is not affected by the pressure of the refrigerant during bypass. The electronic expansion valve (1000) for a heating and cooling system of the present invention is assembled by sequentially fitting a magnet part (1500), a rod part (1600), a magnet cap (1700), and a sleeve (1800) onto the upper part of an adapter part (1400), and a valve part is fixed to the lower part of the adapter part, and an actuator (1900) is fitted onto the upper part of the sleeve and fixed to the body part (1100). The valve part (1300) is fitted into the valve assembly groove (1110) of the body part and has a valve member (1310) having a through hole (1311), a fluid inlet passage (1312), and a bypass hole (1314), a compression spring (1320) fitted axially from the upper part of the valve member, and the valve member (1310) positioned below the compression spring. It consists of a spool valve (1330) in which a cylindrical part (1331) is fitted axially from the upper part of the through hole (1311) to move up and down and selectively block the bypass hole, and a rod part is assembled axially so that the lower surface can be in contact with the spool valve contact part (1220) of the needle (1200), and a refrigerant passage (1335) is formed on the surface in contact with the compression spring and the spool valve contact part, and a stopper valve (1340) fitted to the lower part of the valve member and having an orifice (1342) formed at the axial center.

Description

Technology Field

[0001] The present invention relates to an electronic expansion valve for a heating and cooling system, and more specifically, to an electronic expansion valve for a heating and cooling system in which the refrigerant discharged during expansion and bypass is discharged through a single refrigerant outlet, and is not affected by the pressure of the refrigerant during bypass. Background Technology

[0003] Recently, various types of electronic expansion valves capable of electrically varying flow resistance have been developed and commercialized with the aim of improving refrigerant flow control characteristics and expanding the flow control range, in response to the demands for wide range of capacity changes and operating conditions resulting from the high efficiency of refrigeration and air conditioning systems, the emergence of inverter-driven capacity air conditioners, and multi-type air conditioning systems.

[0004] This electronic expansion valve has needles and orifices forming the cross-sectional area of ​​the refrigerant passage, and a stepping motor that moves the needles as its main components, and is composed of a rotor, a stator, and a screw part that fixes the fixed position of the needles.

[0005] As disclosed in Korean Patent Registration No. 10-2139095, a conventional electronic expansion valve for a heating and cooling system (heat pump cycle) comprises a stepping motor unit equipped with a needle that moves up and down in a linear direction while rotating in forward and reverse directions according to the supply of power; A first inlet / outlet provided on one side and a second inlet / outlet provided on the other side, which are assembled at the lower part of the stepping motor unit and control the refrigerant flow rate according to the movement amount of the needle during cooling and heating, are equipped with a body connected via a first passage and a second passage formed in the axial direction; meanwhile, a first seat formed at the axial center of a valve body installed in the first passage controls the refrigerant flow rate during cooling within the first movement range of the needle, and a second seat installed on the upper part of the valve body controls the refrigerant passage during heating within the second movement range of the needle; a second flow path valve member installed to be in close contact with the second seat has a through hole formed therein to allow the needle to move up and down in the central axis direction, and a pressurizing member installed between the second flow path valve member and an adapter fastened to the upper part of the body pressurizes the second flow path valve member in the direction of closing the second seat, toward being in close contact with the valve body, and installed at a predetermined position of the needle The valve part is configured such that a driving part pressurizes the second flow valve member in an axial upward direction away from the valve body, which is the opening direction of the second toilet seat, so that the driving part is lifted in close contact with the axial lower part of the second flow valve member, thereby allowing the second flow valve member to open the second toilet seat, and a refrigerant passage is provided between the body and the adapter connected to the upper part of the body, in which the pressing member and the second flow valve member are installed, and between the back pressure chamber and the first inlet / outlet, through which refrigerant can flow via the second flow valve member and the valve body.

[0006] Therefore, in order to allow a large flow of refrigerant, a large-diameter second flow path valve member is used, and the second flow path valve member is not subjected to the force of refrigerant pressure, so that the refrigerant passage can be opened and closed with a small driving force under high-pressure refrigerant.

[0007] In such conventional electronic expansion valves for heating and cooling systems, the needle expands by opening and closing the orifice, and when the needle rises, the E-ring shaped actuator rises to lift the second flow path valve member upward, thereby opening the auxiliary flow path. When refrigerant enters through the first flow path and fills the area where the pressurizing member is located, pressure acts from the upper surface of the second flow path valve member downward, and the pressure acting on the upper surface of the second flow path valve member is added to the pressure of the pressurizing member, resulting in a problem where the load increases when the needle moves upward during pipe passing according to the system requirements.

[0009] Reference: Republic of Korea Patent Registration No. 10-2139095, Title of Invention 'Electronic Expansion Valve for Heating and Cooling System'. The problem to be solved

[0011] The present invention has been devised to address the aforementioned requirements and aims to provide an electronic expansion valve for a heating and cooling system in which the refrigerant discharged during expansion and bypass is discharged through a single refrigerant outlet, and the upper and lower parts of the spool valve section are assembled to receive equal pressure, thereby ensuring that the refrigerant is not affected by pressure when moving to the lower part of the spool valve section during bypass. means of solving the problem

[0013] An electronic expansion valve for a heating and cooling system according to the present invention, for achieving the above-mentioned purpose, comprises a magnet part, a rod part, a magnet cap, and a sleeve sequentially fitted and assembled on the upper part of an adapter part, and a valve part fixed to the lower part of the adapter part, and an actuator fitted into the upper part of the sleeve and fixed to the body part by a fastening member, wherein the valve part is fitted into the valve assembly groove of the body part and has a through hole formed in the axial direction, a fluid inlet passage formed through the outer surface in a direction perpendicular to the through hole, and a bypass hole at the bottom, a valve member fitted axially on the upper part of the valve member and fitted axially on the rod part, and a cylindrical part fitted axially on the upper part of the through hole of the valve member so as to be positioned below the compression spring so as to move up and down to selectively block the bypass hole, and wherein the spool valve contact part of the needle and the lower surface are in close contact. It consists of a spool valve in which a refrigerant passage is formed on the surface in contact with the compression spring and the spool valve contact part as the load part is assembled in the axial direction, and a stopper valve fitted to the lower part of the valve member and having an orifice formed at the axial center.

[0014] Herein, the valve member is characterized by having a through hole formed in the axial direction, a fluid inlet passage formed through in a direction perpendicular to the through hole from the outer surface, an O-ring seating groove formed to accommodate an O-ring at the lower part of the fluid inlet passage, and a bypass hole formed through in a direction perpendicular to the through hole from the outer surface at a certain distance from the lower end of the O-ring seating groove.

[0015] And the above-mentioned spool valve comprises a cylindrical portion having a cylindrical outer surface, a sealing ring seating groove formed to accommodate a sealing ring on the upper outer surface of the cylindrical portion, a spring seating portion of a certain thickness formed concavely on the axial upper surface of the cylindrical portion, a rod insertion hole formed penetrating in the axial center direction from the spring seating portion, a plurality of refrigerant passages formed penetrating around the rod insertion hole, and a valve seat extending from the lower outer surface of the cylindrical portion to the bottom surface of the spring seating portion, inclined so that the cross-sectional area of ​​the outer surface gradually increases.

[0016] In addition, the stopper valve is fitted to the lower end of the valve member and fixed by welding or the like while being sealed by a sealing member, and an orifice is formed at the center of the shaft.

[0017] Meanwhile, the stopper valve is further provided with a sealing member pressing member fitted axially from the top to pressurize the sealing member from the top to the bottom. Effects of the invention

[0019] As described above, according to the electronic expansion valve for a heating and cooling system of the present invention, the refrigerant discharged during expansion and bypass is discharged through a single refrigerant outlet, and furthermore, since it is assembled to receive equal pressure at the upper and lower parts of the spool valve section, it has the effect of not being affected by the pressure of the refrigerant when moving to the upper part of the spool valve section after the expansion operation. Brief explanation of the drawing

[0021] FIG. 1 is a perspective view of an electronic expansion valve for a heating and cooling system according to one embodiment of the present invention, and FIG. 2 is a left side view of FIG. 1, FIG. 3 is an exploded perspective view of FIG. 1, FIG. 4 is a perspective view showing the valve member of FIG. 1, FIG. 5 is a perspective view showing the spool valve of FIG. 1, FIG. 6 is a cross-sectional view along line AA of FIG. 2, showing a cross-sectional view with the expansion port closed. FIG. 7 is a cross-sectional view along line AA of FIG. 2, showing a cross-sectional view with the expansion port slightly open. Figure 8 is a cross-sectional view along line AA of Figure 2, showing the expansion port in a fully open state. Specific details for implementing the invention

[0022] Hereinafter, an electronic expansion valve for a heating and cooling system according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0023] In applying reference numerals to the components of the above drawings, identical components are assigned the same reference numeral whenever possible, even if they are shown in different drawings; furthermore, detailed descriptions of known functions and configurations that are deemed to unnecessarily obscure the essence of the invention are omitted. Additionally, directional terms such as 'upper,' 'lower,' 'front,' 'rear,' 'forehead,' 'forward,' and 'rear end' are used in relation to the orientation of the disclosed drawings(s). Since the components of the embodiments of the invention can be positioned in various orientations, directional terms are used for illustrative purposes only and are not intended to be limiting.

[0024] An electronic expansion valve (1000) for a heating and cooling system according to one embodiment of the present invention comprises, as shown in FIGS. 1 to 8, a body part (1100), a needle (1200), a valve part (1300), an adapter part (1400), a magnet part (1500), a rod part (1600), a magnet cap (1700), a sleeve (1800), and an actuator (1900).

[0025] Here, the body part (1100) is equipped with a valve assembly groove (1110) formed to a certain depth from the top to the bottom, a refrigerant inlet (1120) formed vertically in the valve assembly groove, and a refrigerant outlet (1130) configured to discharge the refrigerant that has entered through the refrigerant inlet to the outside when expanding and bypassing through the valve assembly groove.

[0026] Therefore, when expanding, the refrigerant enters through the refrigerant inlet (1120) and exits through the refrigerant outlet (1130), and when bypassing, it is discharged through the refrigerant outlet (1130), so the valve structure is simplified, and the piping structure inside the vehicle is simplified.

[0027] And the above needle (1200) is equipped with a needle portion (1210) that is inserted into an orifice described later and can move in the axial direction, a spool valve contact portion (1220) formed vertically at the axial center on the upper part of the needle portion, and a rod connection portion (1230) formed at the axial center of the spool valve contact portion (1220) and connected to the lower end of the rod portion (1600).

[0028] Accordingly, with the needle (1200) assembled at the bottom of the load portion (1600), expansion is selectively performed by opening and closing the orifice, and the refrigerant is discharged through the refrigerant discharge port (1130) of the body portion (1100).

[0029] Additionally, the valve section (1300) comprises a valve member (1310) fitted into the valve assembly groove (1110) of the body (1100), a compression spring (1320) fitted axially from the upper part of the valve member and fitted axially from the rod section (1600), a spool valve (1330) fitted axially from the upper part of the valve member (1310) so as to be positioned below the compression spring and assembled so that the lower surface is in contact with the spool valve contact part (1220) of the needle (1200), and a through hole (1331) is formed on the surface in contact with the compression spring and the spool valve contact part, and a stopper valve (1340) fitted to the lower part of the valve member (1310) and having an orifice (1342) formed at the axial center.

[0030] Accordingly, as shown in FIG. 6, when the needle (1200) is inserted into the orifice (1342) and as shown in FIG. 7, when the needle (1200) is removed from the orifice (1342), expansion occurs, and the refrigerant flowing into the refrigerant inlet (1120) is discharged to the refrigerant outlet (1130) through the through hole (1331) and the orifice (1342) of the spool valve (1330). Also, during bypass, the needle (1200) assembled at the bottom of the load portion (1600) rises to the state shown in FIG. 7 and then rises to the state shown in FIG. 8. As the spool valve (1330) rises easily without pressure from the top due to the through hole (1331), the refrigerant is discharged to the refrigerant outlet (1130) through the bypass hole formed at the bottom of the valve member (1310), which will be described later. Thus, the refrigerant discharged through expansion and bypass The refrigerant is discharged simultaneously through a single refrigerant outlet (1130).

[0031] Here, the valve member (1310) has a structure having a through hole (1311) formed in the axial direction, a fluid inlet passage (1312) formed at 90-degree intervals in a direction perpendicular to the through hole from the outer surface, an O-ring seating groove (1313) formed to accommodate an O-ring (1310a) in the lower part of the fluid inlet passage, and a bypass hole (1314) formed at 90-degree intervals in a direction perpendicular to the through hole from the outer surface, which is located at the lower part of the O-ring seating groove and is spaced a certain distance from the lower end.

[0032] Accordingly, when refrigerant enters through the refrigerant inlet (1120) of the upper body part (1100), the refrigerant is discharged toward the stopper valve (1340) assembled at the bottom through the fluid inlet passage (1312) and the through hole (1311), and at the same time, the refrigerant is bypassed through the bypass hole (1314) that opens when the spool valve (1330) rises.

[0033] And the above spool valve (1330) comprises a cylindrical part (1331) having a cylindrical outer surface, a sealing ring seating groove (1332) formed to accommodate a sealing ring (1330a) on the upper outer surface of the cylindrical part, a spring seating part (1333) of a certain thickness formed concavely on the axial upper surface of the cylindrical part, a rod insertion hole (1334) formed through the spring seating part in the axial center direction, a plurality of refrigerant passages (1335) formed through the periphery of the rod insertion hole, and a valve seat (1336) extending from the lower outer surface of the cylindrical part (1331) at an angle such that the cross-sectional area of ​​the outer surface gradually increases, and extending to the bottom surface of the spring seating part.

[0034] Accordingly, as shown in FIG. 6, when the lower portion is fitted into the valve member (1310) and the rod portion (1600) so that it is in close contact with the stopper valve (1340), the bypass hole (1314) of the valve member (1310) is closed by the cylindrical portion (1331). Meanwhile, when the spool valve (1330) is lowered by the sealing ring (1330a) seated in the sealing ring seating groove (1332), the cylindrical portion (1331) is sealed so that refrigerant does not leak to the outer surface. At the same time, the refrigerant flowing into the refrigerant passage (1335) flows in the axial center direction, and when the spool valve (1330) rises, the pressure in the upper and lower portions is equal due to the plurality of refrigerant passages (1335) in the axial direction, so that there is no pressure difference when the spool valve (1330) rises. The actuator (1900) operates smoothly without straining the actuator.

[0035] In addition, the stopper valve (1340) is fitted to the lower end of the valve member (1310) and fixed by welding or the like while being sealed by a sealing member (1341), and an orifice (1342) is formed at the center of the shaft.

[0036] Therefore, as the needle (1200) enters and exits the orifice (1342), expansion is selectively performed.

[0037] It is preferable that the stopper valve (1340) further comprises a sealing member pressing member (1343) fitted axially from the top to press the sealing member (1341) from the top to the bottom.

[0038] Meanwhile, the adapter part (1400) is fitted onto the upper part of the valve member (1310) and fixed by welding, and is fastened so as to be sealed on the upper part of the body (1110), and has an adapter (1410) in which the lower part is received and fastened in the valve assembly groove (1110) of the body (1110), and a magnet guide (1420) fixed to the upper part of the adapter.

[0039] Accordingly, the magnet guide (1420) is fixed to the upper part of the body (1110) via the adapter (1410), thereby allowing the magnet part (1500) to be rotatably fitted onto the outer surface of the magnet guide (1420).

[0040] In addition, the magnet part (1500) is installed so as to be rotatable by being fitted into the upper part of the magnet guide (1420).

[0041] Accordingly, when the magnet part (1500) is assembled with the actuator (1900) at the top of the body (1110), when power is applied to the actuator (1900), the magnet part (1500) rotates around the magnet guide (1420) as the center of rotation.

[0042] In addition, the above-mentioned rod portion (1600) is assembled at one end to the axis center of the above-mentioned magnet portion (1500) so that it can move axially at the same time as the rotation of the magnet portion when power is applied, and the other end is connected to the axis center of the needle (1200).

[0043] Accordingly, as the magnet part (1500) rotates and moves up and down in the axial direction, the needle (1200) moves up and down to open and close the orifice (1342), while the spool valve (1330) is pressed downward to close the bypass hole (1314) of the valve member (1310) so that the refrigerant is not bypassed. Also, when the load part (1600) rises, the spool valve (1330) rises by the upper surface (1220) of the needle (1200) assembled on the load part (1600) to open the bypass hole (1314), and at this time, a refrigerant passage (1335) is formed in the spool valve (1330) so that it rises naturally without being affected by pressure during the rise.

[0044] Here, the above-mentioned rod portion (1600) is described in more detail as follows: it includes a spiral member (1610) that is connected to the axis center of the magnet portion (1500) and is configured to move up and down, a rod fixing member (1620) that is fitted and fixed to the axis center of the spiral member, and a rod member (1630) that has one end connected to the axis center of the rod fixing member and the other end connected to the needle (1200).

[0045] Accordingly, when the magnet part (1500) rotates, the spiral member (1610) moves up and down, and at this time, the rod fixing member (1620) fixed to the spiral member also moves up and down synchronously, while the rod member (1630) moves downward and simultaneously the spool valve (1330) moves downward by the compression spring (1320), and as the rod member (1630) rises, the spool valve (1330) rises together with the needle (1200) to simultaneously open the orifice (1342) and the bypass hole (1314).

[0046] In addition, the magnet cap (1700) supports the rod portion (1600) while blocking one end when the rod portion (1600) is assembled to one end of the magnet portion (1500).

[0047] Accordingly, the magnet cap (1700) supports the upper center of rotation when the magnet part (1500) rotates, and supports the rod part (1600) including the magnet part (1500) so that it is not pushed upward.

[0048] Additionally, the sleeve (1800) is fixed to the upper part of the adapter part (1400) by welding so as to wrap the magnet cap (1700) and the magnet part (1500).

[0049] Accordingly, the sleeve (1800) acts as an axis into which the actuator (1900) is fitted, and acts as a guide to allow the magnet part (1500) to rotate.

[0050] Additionally, the actuator (1900) is fixed by being seated on the upper part of the body part (1100) and has a coil wound inside so that it can rotate the magnet part (1500) when power is applied, and a bracket is fitted at the bottom and fixed with a fixing means such as a bolt, and the protrusion of the bracket is fitted so as to be detachably fitted to the side of the body (1100).

[0051] To describe the actuator (1900) in more detail, it consists of a mold part (1910) in which a coil is wound inside, a printed circuit board (1920) placed on the upper part of the mold part, a cover (1930) placed on the upper part of the mold part and sealed to accommodate the printed circuit board, and a bracket (1940) fitted to the lower part of the mold part (1910).

[0052] Accordingly, the bracket (1940) of the actuator (1900) is fitted into the sleeve (1800) and fixed to the body (1100) by a fastening member (1901) such as a fastening screw, and when power is applied to the actuator (1900), the magnet part (1500) is rotated forward or backward so that the rod member (1630) of the rod part (1600) can move up and down.

[0053] The embodiments of the present invention described above and illustrated in the drawings should not be interpreted as limiting the technical scope of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and a person skilled in the art may modify and change the technical scope of the present invention in various forms. Therefore, such modifications and changes will fall within the scope of protection of the present invention if they are obvious to a person skilled in the art. Explanation of the symbols

[0055] 1000: Electronic expansion valve for heating and cooling systems 1100: Body 1110: Valve assembly groove 1120: Refrigerant inlet 1130: Refrigerant outlet 1200: Needle 1210: Needle part 1220: Spool valve sealing part 1230: Rod connection part 1300: Valve part 1310: Valve member 1311: Through hole 1312: Fluid inlet passage 1313: O-ring seating groove 1314: Bypass hole 1320: Compression spring 1330: Spool valve 1331: Cylindrical part 1332: Sealing ring seating groove 1333: Spring seating part 1334: Rod insertion hole 1335: Refrigerant passage 1336: Valve seat 1331: Through hole 1340: Stopper valve 1341: Sealing member 1342: Orifice 1400: Adapter part 1410: Adapter 1420: Magnet Guide 1500: Magnet part 1600: Load part 1610: Spiral member 1620: Rod fixing member 1630: Load component 1700: Magnet cap 1800: Sleeve 1900: Actuator

Claims

Claim 1 In an electronic expansion valve for a heating and cooling system, wherein a magnet part (1500), a rod part (1600), a magnet cap (1700), and a sleeve (1800) are sequentially fitted and assembled on the upper part of an adapter part (1400), a valve part (1300) is fixed to the lower part of the adapter part (1400), and an actuator (1900) is fitted onto the upper part of the sleeve (1800) and fixed to the body part (1100), and the valve part (1300) is fitted into a valve assembly groove (1110) on the upper part of the body part (1100), the valve part (1300) is fitted into the valve assembly groove (1110) of the body part (1100) and has a through hole (1311) formed in the axial direction, a fluid inlet passage (1312) formed through the outer surface in a direction perpendicular to the through hole, and the A valve member (1310) having an O-ring seating groove (1313) formed to accommodate an O-ring in the lower part of a fluid inlet passage, and a bypass hole (1314) formed through the outer surface at a certain distance from the lower end of the O-ring seating groove in a direction perpendicular to the through hole; a compression spring (1320) fitted axially from the upper part of the valve member and fitted axially to the rod part (1600); a cylindrical part (1331) having a cylindrical outer surface axially above the through hole (1311) of the valve member (1310) to be positioned below the compression spring; a sealing ring seating groove (1332) formed to accommodate a sealing ring (1330a) on the upper outer surface of the cylindrical part; a spring seating part (1333) of a certain thickness formed concavely on the upper axial surface of the cylindrical part; and an axial center in the spring seating part It is composed of a rod insertion hole (1334) formed through in the direction, a plurality of refrigerant passages (1335) formed through around the rod insertion hole, and a valve seat (1336) extending to the bottom surface of the spring seating portion, inclined so that the cross-sectional area of ​​the outer surface gradually increases from the lower outer surface of the cylindrical portion (1331), and, in addition,An electronic expansion valve for a heating and cooling system, characterized by comprising: a spool valve (1330) in which a refrigerant passage (1335) is formed in the axial direction on the surface in contact with the compression spring and the spool valve contact part (1220) so as to selectively block the bypass hole (1314) by moving up and down as the above cylindrical part (1331) is fitted and the lower surface is in contact with the spool valve contact part (1220) of the needle (1200); and a stopper valve (1340) in which an orifice (1342) is formed at the axial center, while being fitted to the lower part of the valve member (1310) and fixed by welding or the like while being sealed by a sealing member (1341). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 An electronic expansion valve for a heating and cooling system, characterized in that, in the first paragraph, the stopper valve (1340) further comprises a sealing member pressing member (1343) fitted axially from the top to pressurize the sealing member (1341) from the top to the bottom.

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