Two-position three-way electric valve

Abstract

The two-position three-way electric valve comprises a valve body, a valve seat, an execution assembly and a driving mechanism, the execution assembly comprises a valve element, a nut is in driving connection with the valve element, and the valve element only moves in the vertical direction; a first sealing ring and a second sealing ring are sequentially arranged on the periphery of the valve element from top to bottom, when the valve element is in the lower position state, the periphery of the lower end of the valve element is in clearance fit with the second sealing hole, and the second sealing ring and the second sealing hole are sealed in a matched mode; when the valve element is in an upper state, the periphery of the lower end of the valve element is in clearance fit with the first sealing hole, and the first sealing ring and the first sealing hole are sealed in a matched mode. The driving torque required for opening or closing the valve element is not influenced by the pressure of the inlet, the first outlet and the second outlet.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, and particularly relates to a two-position three-way electric valve. Background Art

[0002] A refrigeration system includes a compressor, an evaporator, a condenser, a throttling element, and a reversing valve. Usually, an electronic expansion valve is used as the throttling element, and a two-position three-way electric valve is used to switch the refrigerant flow direction.

[0003] Chinese Utility Model Application No. 202122639749.9 discloses a light and stable two-position three-way valve, which includes a valve body, a valve seat assembly arranged on the valve body, an actuator assembly arranged on the valve body, and a driving mechanism arranged on the actuator assembly and used to drive the actuator assembly. The driving mechanism includes a screw rod fixedly connected with a rotor, and a nut that cooperates with the screw rod and is fixedly connected with the valve seat assembly. When the screw rod drives the valve core to move up and down, but when the valve core is closed or opened, the valve core will rotate with the screw rod, and a large amount of wear will occur between the valve core and the valve seat, resulting in an increase in the internal leakage of the refrigerant. Summary of the Invention

[0004] The purpose of the utility model is to provide a two-position three-way electric valve, which reduces the leakage rate between the valve core and the valve seat and improves the sealing performance between the valve core and the valve seat in the closed state.

[0005] The utility model provides a two-position three-way electric valve, which comprises a valve body, a valve seat arranged on the valve body, an actuator assembly arranged in the valve seat, and a driving mechanism arranged on the actuator assembly and used for driving the actuator assembly. A vertical main valve hole is arranged in the valve body. An inlet and a first outlet communicated with the main valve hole are arranged on the side surface of the valve body. A second outlet communicated with the main valve hole is arranged at the bottom of the valve body. The valve seat comprises a hollow valve seat body arranged in the main valve hole. Two annular relief grooves are arranged on the outer peripheral surface of the valve seat body and are distributed up and down along the axis of the valve seat body. A first valve hole and a second valve hole penetrating through the valve seat body are arranged on the side surface of the valve seat body. The first valve hole and the second valve hole are respectively located in the two annular relief grooves. The first outlet is communicated with the part of the main valve hole corresponding to the uppermost annular relief groove. The inlet is communicated with the part of the main valve hole corresponding to the lowermost annular relief groove. The second outlet is communicated with the bottom of the main valve hole. The side surface of the valve seat body is attached to the inner wall of the main valve hole. The driving mechanism comprises a sleeve, a rotor arranged in the sleeve, a coil arranged outside the sleeve and used for driving the rotor to rotate, a screw rod fixedly connected with the rotor, and a nut matched with the screw rod and drivingly connected with the actuator assembly. It is characterized in that the actuator assembly comprises a valve core, the nut is drivingly connected with the valve core, and the valve core only moves in the vertical direction. A first sealing ring is arranged on the outer periphery of the lower end of the valve core. A second sealing hole is arranged in the valve seat body at the connection of the second outlet and the main valve hole. A first sealing hole is arranged in the valve seat body between the two annular relief grooves. When the valve core is in the lower position, the outer periphery of the lower end of the valve core is in clearance fit with the second sealing hole, the first sealing ring is matched with the second sealing hole for sealing, and the first sealing ring seals the connection between the main valve hole and the second outlet. When the valve core is in the upper position, the outer periphery of the lower end of the valve core is in clearance fit with the first sealing hole, the first sealing ring is matched with the first sealing hole for sealing, and the first sealing ring seals the inner cavity of the valve seat body between the first valve hole and the second valve hole.

[0006] In some embodiments, a first sealing ring and a second sealing ring are sequentially arranged on the outer periphery of the lower end of the valve core from top to bottom, and the first sealing ring and the second sealing ring are spaced apart by a predetermined distance; a second sealing hole is provided in the valve seat body at the connection between the second outlet and the main valve hole, and a first sealing hole is provided in the valve seat body between the two annular relief grooves. When the valve core is in the lower position, the outer periphery of the lower end of the valve core is in clearance fit with the second sealing hole, and the second sealing ring is in sealing fit with the second sealing hole, that is, the second sealing ring closes the connection between the main valve hole and the second outlet; when the valve core is in the upper position, the outer periphery of the lower end of the valve core is in clearance fit with the first sealing hole, and the first sealing ring is in sealing fit with the first sealing hole, and the first sealing ring closes the inner cavity of the valve seat body between the first valve hole and the second valve hole.

[0007] In some embodiments, the first sealing ring or the second sealing ring includes an annular metal skeleton with a plurality of small holes and rubber.

[0008] In some embodiments, the first sealing hole and the second sealing hole have the same diameter.

[0009] In some embodiments, the valve seat body includes an inner hole in clearance fit with the upper end of the valve core, and the inner hole has the same diameter as the first sealing hole and the second sealing hole.

[0010] In some embodiments, a sealing ring is arranged between the upper end of the valve core and the valve seat body.

[0011] In some embodiments, the cross-section of the first sealing ring or the second sealing ring is dumbbell-shaped, and an annular sealing groove corresponding to the cross-section of the first sealing ring or the second sealing ring is arranged at the lower end of the valve core.

[0012] In some embodiments, a step, a first sealing ring, a spacer ring, a second sealing ring, and a retaining ring are sequentially arranged at the lower end of the valve core.

[0013] In some embodiments, the middle of the cross-sections of the step, the spacer ring, and the retaining ring protrudes.

[0014] In some embodiments, the valve core has a first balance hole penetrating up and down, and the screw has a second balance hole penetrating up and down.

[0015] The utility model provides a two-position three-way electric valve, which comprises a valve body, a valve seat, an execution assembly and a driving mechanism. The execution assembly comprises a valve core. The nut is drivingly connected to the valve core, and the valve core only moves in the vertical direction. First and second sealing rings are sequentially arranged on the outer periphery of the valve core from top to bottom. When the valve core is in the lower position, the outer periphery of the lower end of the valve core is in clearance fit with the second sealing hole, and the second sealing ring is in fit with the second sealing hole for sealing, and the second sealing ring seals the communication between the main valve hole and the second outlet. When the valve core is in the upper position, the outer periphery of the lower end of the valve core is in clearance fit with the first sealing hole, and the first sealing ring is in fit with the first sealing hole for sealing, and the first sealing ring seals the inner cavity of the valve seat between the first valve hole and the second valve hole. By adopting a valve core pressure balance structure, the driving torque required for opening or closing the valve core is not affected by the pressures at the inlet, the first outlet and the second outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the two-position three-way electric valve according to Embodiment 1 of the utility model;

[0017] Figure 2 is Embodiment 1 of the utility model Figure 1 of the three-dimensional structural diagram of the two-position three-way electric valve;

[0018] Figure 3 is Embodiment 1 of the utility model Figure 1 of the valve seat, the execution assembly and the driving mechanism (except the coil) structural diagram;

[0019] Figure 4 is Embodiment 1 of the utility model Figure 1 of the valve body structural diagram;

[0020] Figure 5 is Embodiment 1 of the utility model Figure 1 of the metal skeleton diagram;

[0021] Figure 6 is a schematic structural diagram of the two-position three-way electric valve according to Embodiment 2 of the utility model;

[0022] Figure 7 is Embodiment 2 of the utility model Figure 6 of the first sealing ring diagram.

[0023] Among them, the serial numbers are explained as follows: valve body 1, main valve hole 11, inlet 12, first outlet 13, second outlet 14, drive mechanism 100, sleeve 101, rotor 102, coil 103, screw 104, second balance hole 1041, nut 105, lug 1051, actuator assembly 200, valve core 201, first sealing ring 202, metal skeleton 20211, concave part 2022, second sealing ring 203, first balance hole 204, retaining ring 205, separating ring 206, retaining ring 207, valve seat 300, valve seat body 301, annular relief groove 302, annular relief groove 303, first valve hole 304, second valve hole 305, second sealing hole 306, first sealing hole 307, inner hole 308, connecting seat 3011, first valve seat 3012, second valve seat 3013, support frame 4, groove 401, bearing 5, rubber O-ring 27, rubber O-ring 28, rubber O-ring 29, rubber O-ring 30. Detailed implementation manners

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this utility model will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. In the figures, the thicknesses of regions and layers are exaggerated for clarity. Like reference numerals in the figures denote like or similar structures and thus their detailed description will be omitted.

[0025] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of this utility model. However, those skilled in the art will realize that the technical solutions of this utility model can be practiced without one or more of the specific details, or other methods, components, materials, etc. can be used. In other cases, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of this utility model.

[0026] Refer to Figures 1 to 5 As shown, the two-way three-position electric valve according to the first embodiment of this utility model includes a valve body 1, a valve seat 300 provided on the valve body, an actuator assembly 200 provided in the valve seat, and a drive mechanism 100 provided on the actuator assembly and used to drive the actuator assembly.

[0027] A main valve hole 11 is vertically provided in a valve body 1. An inlet 12 and a first outlet 13 communicating with the main valve hole are provided on the side of the valve body. A second outlet 14 communicating with the main valve hole is provided at the bottom of the valve body. A valve seat 300 includes a hollow valve seat body 301 disposed in the main valve hole. Two annular relief grooves 302 and 303 are provided on the outer peripheral surface of the valve seat body. The annular relief grooves are distributed up and down along the axis of the valve seat body. A first valve hole 304 and a second valve hole 305 penetrating through the valve seat body are provided on the side of the valve seat body. The first valve hole and the second valve hole are respectively located in the two annular relief grooves. The first outlet 13 communicates with the part of the main valve hole corresponding to the uppermost annular relief groove 302. The inlet 12 communicates with the part of the main valve hole corresponding to the lowermost annular relief groove 303. The second outlet 14 communicates with the bottom of the main valve hole 11. The side surface of the valve seat body 301 is in fit with the inner wall of the main valve hole.

[0028] The driving mechanism 100 includes a sleeve 101, a rotor 102 disposed in the sleeve, a coil 103 disposed outside the sleeve for driving the rotor to rotate, a screw 104 fixedly connected to the rotor, and a nut 105 engaged with the screw and drivingly connected to the actuating assembly.

[0029] The actuating component 200 includes a valve core 201. The nut 105 is drivingly connected to the valve core 201, and the valve core only moves in the vertical direction. On the outer periphery of the lower end of the valve core 201, a first sealing ring 202 and a second sealing ring 203 are successively arranged from top to bottom. The first sealing ring and the second sealing ring are spaced apart by a predetermined distance. The first sealing ring or the second sealing ring can be formed by vulcanized rubber with a metal skeleton. A second sealing hole 306 is provided at the connection between the second outlet 14 and the main valve hole. A first sealing hole 307 is provided in the valve seat body between the two annular relief grooves. The first sealing ring 202 and the second sealing ring 203 are located between the first sealing hole 307 and the second sealing hole 306. When the valve core 201 is in the lower position, there is a clearance fit between the outer periphery of the lower end of the valve core and the second sealing hole 306, and the second sealing ring 203 is in fit with the second sealing hole 306, that is, the second sealing ring closes the connection between the main valve hole and the second outlet. When the valve core 201 is in the upper position, there is a clearance fit between the outer periphery of the lower end of the valve core and the first sealing hole 307, and the first sealing ring 202 is in fit with the first sealing hole 307 for sealing, that is, the first sealing ring 202 closes the inner cavity of the valve seat body between the first valve hole and the second valve hole. Wherein, the upper end of the valve core has a recess. The nut 105 is accommodated in the recess and fixed to the valve core with a retaining ring 205 to prevent the nut from coming out. The nut 105 includes a lug 1051. There is a notch on the side wall of the recess of the valve core. The lug of the nut extends out of the notch to prevent the nut from rotating. The valve core has a first balance hole 204 that penetrates up and down. The valve seat body includes an inner hole 308 that has a clearance fit with the upper end of the valve core. There is a clearance fit between the upper end of the valve core and the inner hole 308 of the valve seat body. A sealing ring 30 is provided between the upper end of the valve core and the valve seat body. The screw has a second balance hole 1041 that penetrates up and down. The inner hole has the same diameter as the first sealing hole 307 and the second sealing hole 306. The diameter of the middle section of the valve core is smaller than that of the two ends, which is convenient for the flow of the medium. By adopting the valve core pressure balance structure, the driving torque required for the valve core to open or close is not affected by the pressures at the inlet, the first outlet, and the second outlet. It can be applied to high-pressure working conditions and can also adapt to the situation where there is back pressure at the closed outlet. By adopting the valve core pressure balance structure, the required rotational torque is small. The valve core only moves up and down without rotating, reducing the wear between the valve core and the valve seat and improving the sealing performance.

[0030] In this technical solution, a step, a first sealing ring 202, a spacer ring 206, a second sealing ring 203, and a retaining ring 207 are successively arranged at the lower end of the valve core. The first sealing ring and the second sealing ring are metal-skeleton vulcanized rubber sealing rings. The first sealing ring and the second sealing ring are spaced apart by a predetermined distance through the spacer ring, and are limited by welding or interference fit of the retaining ring. The metal skeleton 20211 has a plurality of small holes to firmly bond the rubber, and the rigidity of the metal skeleton is used to prevent the sealing ring from being washed off by the fluid. The first sealing ring and the second sealing ring are spaced apart by a predetermined distance through the spacer ring, which can reduce the movement stroke of the valve core and realize a rapid switching of the medium flow direction. Using only the first sealing ring alone can also achieve the switching function, but the movement stroke of the valve core is increased and the switching is relatively slow.

[0031] Reference Figure 3 As shown, in some embodiments, the two-position three-way electric valve includes a support frame 4 and a bearing 5. The support frame 4 is fixed to the upper end of the valve seat body 301, the bearing is fixed to the upper end of the support frame, the bearing is fixedly connected to the screw 104, and the support frame further includes a longitudinal groove 401. The lug of the nut extends into the longitudinal groove to prevent the nut and the valve core from rotating. In other embodiments, a retaining ring radially projects a lug to prevent the valve core from rotating, and an irregular retaining ring is used to prevent the nut from rotating, both of which can achieve the design purpose.

[0032] Reference Figure 1 、 2 As shown in FIGS. 、3, in some embodiments, the valve seat body 301 includes a connecting seat 3011, a first valve seat 3012 with a side wall, and a second valve seat 3013 with a side wall that are fixedly connected in sequence. After being separately processed and then connected, the processing difficulty of the parts is reduced. Rubber O-ring seals 27, 28, and 29 for sealing the valve seat body and the main valve hole are provided on the side surfaces of the valve seat body on the upper and lower sides of the annular relief grooves 302 and 303. Except for the coil, the valve seat, the actuator assembly, and the drive mechanism form an integral body, and are fixedly installed in the main valve hole 11 of the valve body by threaded insertion of the connecting seat, and the coil is directly fixed to the valve body end face by screws.

[0033] Reference Figures 6 to 7 As shown, according to the two-position three-way electric valve of the second embodiment of the present invention, compared with the two-position three-way electric valve of the first embodiment, the main difference lies in the structures of the first seal ring and the second seal ring, and the rest refers to the first embodiment. The cross-section of the first seal ring 202 or the second seal ring 203 is dumbbell-shaped, that is, it has a concave portion 2022 in the middle, and a corresponding annular sealing groove that matches the cross-section of the first seal ring or the second seal ring is provided at the lower end of the valve core. Specifically, a step, a first seal ring, a spacer ring 206, a second seal ring, and a retaining ring 207 are sequentially provided at the lower end of the valve core, and the middle of the cross-sections of the step, the spacer ring, and the retaining ring protrude and protrude into the concave portion 2022 of the cross-section of the second seal ring to limit the first seal ring or the second seal ring from coming out.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Two-way three-position electric valve, comprising a valve body, a valve seat arranged on the valve body, an actuator assembly arranged in the valve seat, and a drive mechanism arranged on the actuator assembly and used to drive the actuator assembly. A vertical main valve hole is provided in the valve body. An inlet and a first outlet communicating with the main valve hole are provided on the side of the valve body. A second outlet communicating with the main valve hole is provided at the bottom of the valve body. The valve seat includes a hollow valve seat body arranged in the main valve hole. Two annular relief grooves are provided on the outer peripheral surface of the valve seat body. The annular relief grooves are distributed up and down along the axis of the valve seat body. A first valve hole and a second valve hole penetrating the valve seat body are provided on the side of the valve seat body. The first valve hole and the second valve hole are respectively located in two of the annular relief grooves. The first outlet communicates with the part of the main valve hole corresponding to the uppermost annular relief groove. The inlet communicates with the part of the main valve hole corresponding to the lowermost annular relief groove. The second outlet communicates with the bottom of the main valve hole. The side surface of the valve seat body fits with the inner wall of the main valve hole. The drive mechanism includes a sleeve, a rotor arranged in the sleeve, a coil arranged outside the sleeve and used to drive the rotor to rotate, a screw rod fixedly connected with the rotor, and a nut that cooperates with the screw rod and is drivingly connected with the actuator assembly. It is characterized in that, The actuating component includes a valve core. The nut is drivingly connected to the valve core, and the valve core only moves in the vertical direction. A first sealing ring is provided on the outer periphery of the lower end of the valve core. A second sealing hole is provided in the valve seat body at the connection between the second outlet and the main valve hole. A first sealing hole is provided in the valve seat body between the two annular relief grooves. When the valve core is in the lower position, the outer periphery of the lower end of the valve core is in clearance fit with the second sealing hole, and the first sealing ring is in sealing fit with the second sealing hole, and the first sealing ring seals the connection between the main valve hole and the second outlet. When the valve core is in the upper position, the outer periphery of the lower end of the valve core is in clearance fit with the first sealing hole, and the first sealing ring is in sealing fit with the first sealing hole, and the first sealing ring seals the inner cavity of the valve seat body between the first valve hole and the second valve hole.

2. The two-position three-way electric valve according to claim 1, characterized in that The outer periphery of the lower end of the valve core is successively provided with a first sealing ring and a second sealing ring from top to bottom, and the first sealing ring and the second sealing ring are spaced apart by a predetermined distance. When the valve core is in the lower position, the outer periphery of the lower end of the valve core is in clearance fit with the second sealing hole, and the second sealing ring is in sealing fit with the second sealing hole, and the second sealing ring seals the connection between the main valve hole and the second outlet. When the valve core is in the upper position, the outer periphery of the lower end of the valve core is in clearance fit with the first sealing hole, and the first sealing ring is in sealing fit with the first sealing hole, and the first sealing ring seals the inner cavity of the valve seat body between the first valve hole and the second valve hole.

3. The two-position three-way electric valve according to claim 2, wherein, The first sealing ring or the second sealing ring includes a ring-shaped metal skeleton with a plurality of small holes and rubber.

4. The two-position three-way electric valve according to claim 2, characterized in that, The diameters of the first sealing hole and the second sealing hole are equal.

5. The two-position three-way electric valve according to claim 4, characterized in that, The valve seat body includes an inner hole that is in clearance fit with the upper end of the valve core, and the inner hole has the same diameter as the first sealing hole and the second sealing hole.

6. The two-position three-way electric valve according to claim 5, characterized in that, The valve core has a first balance hole that penetrates up and down, and a sealing ring is provided between the valve core and the valve seat body.

7. The two-position three-way electric valve according to claim 2, wherein, The cross-section of the first sealing ring or the second sealing ring is dumbbell-shaped, and a corresponding annular sealing groove that matches the cross-section of the first sealing ring or the second sealing ring is provided at the lower end of the valve core.

8. The two-way three-way electric valve according to claim 7, characterized in that, A step, a first sealing ring, a spacer ring, a second sealing ring, and a retaining ring are successively arranged at the lower end of the valve core.

9. The two-way three-position electric valve according to claim 8, characterized in that, The middle of the cross-sections of the step, the spacer ring, and the retaining ring protrudes.

10. The two-position three-way electric valve according to claim 1, characterized in that, The screw has a second balance hole that penetrates up and down.

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