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 part and a second sealing part are sequentially arranged on the periphery of the valve element from top to bottom. The first sealing part or the second sealing part comprises a metal framework vulcanized rubber sealing ring and a fixed check ring. A first sealing part and a second sealing part are sequentially arranged on the periphery of the valve element from top to bottom, and when the valve element is in a lower limiting state, the second sealing part seals the communicating position of the main valve hole and the second outlet; and when the valve core is in an upper limiting state, the first sealing part seals the inner cavity of the valve seat body between the first valve hole and the second valve hole. The sealing ring is vulcanized through the metal framework, so that the sealing performance between the valve element and each sealing seat is improved, and the sealing ring can be prevented from falling off.

Description

Technical Field

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

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

[0003] Chinese utility model application 202122639749.9 discloses a lightweight and stable two-position three-way valve, comprising 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 comprising a screw rod fixedly connected to a rotor, and a nut cooperating with the screw rod and fixedly connected to the valve seat assembly, 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, resulting in a lot of wear between the valve core and the valve seat, resulting in an increase in the amount of internal leakage of the refrigerant.

[0004] Chinese utility model application 202320044108.5 discloses a two-position three-way electric valve, which switches the refrigerant flow direction by driving a piston through a pilot valve core. The piston structure is relatively complex and the production cost is relatively high. Utility Model Content

[0005] The utility model aims 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 a closed state.

[0006] The utility model provides a two-position three-way electric valve, comprising a valve body, a valve seat arranged on the valve body, an actuator arranged in the valve seat, and a driving mechanism arranged on the actuator and used to drive the actuator. A vertical main valve hole is arranged in the valve body, an inlet and a first outlet are arranged on the side of the valve body and are communicated with the main valve hole, a second outlet is arranged at the bottom of the valve body and is communicated with the main valve hole, the valve seat comprises a hollow valve seat body and two sealing seats arranged in the main valve hole, and two annular give way grooves are arranged on the outer peripheral surface of the valve seat body. The annular give-way groove is distributed up and down along the axis of the valve seat body, and the side surface of the valve seat body is provided with a first valve hole and a second valve hole penetrating the valve seat body, the first valve hole and the second valve hole are respectively located in the two annular give-way grooves, the first outlet is communicated with the main valve hole portion corresponding to the uppermost annular give-way groove, the inlet is communicated with the main valve hole portion corresponding to the lowermost annular give-way groove, the second outlet is communicated with the bottom of the main valve hole, and the side surface of the valve seat body is in contact with the inner wall of the main valve hole; the driving mechanism includes a sleeve, a A rotor, a coil disposed outside the sleeve for driving the rotor to rotate, a screw rod fixedly connected to the rotor, and a nut matched with the screw rod and drivingly connected to the actuator, characterized in that the actuator comprises a valve core, the nut is drivingly connected to the valve core, and the valve core only moves in the vertical direction; the outer periphery of the valve core is provided with a first sealing part and a second sealing part from top to bottom in sequence, and the first sealing part or the second sealing part comprises a metal skeleton vulcanized rubber sealing ring and a fixed retaining ring; a conical second sealing seat is provided in the valve seat body at the connection between the second outlet and the main valve hole, a conical first sealing seat is provided in the valve seat body between the two annular accommodating grooves, the first sealing part and the second sealing part are located between the first sealing seat and the second sealing seat, when the valve core is in the lower limit state, the second sealing part abuts the second sealing seat, that is, the second sealing part closes the connection between the main valve hole and the second outlet; when the valve core is in the upper limit state, the first sealing part abuts the first sealing seat, that is, the first sealing part closes the inner cavity of the valve seat body between the first valve hole and the second valve hole.

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

[0008] In some embodiments, the upper end of the valve core has a recess, the nut is accommodated in the recess, and a retaining ring is used to prevent the nut from falling out.

[0009] In some embodiments, a first spring and a second spring are respectively provided at the upper and lower ends of the nut, the first spring abuts against the retaining ring, and the second spring abuts against the bottom surface of the recess.

[0010] In some embodiments, the first spring and the second spring have the same specifications.

[0011] In some embodiments, the valve core has a first balancing hole that passes through from top to bottom, the valve core is clearance-matched with the side surface of the valve seat body, and a sealing ring is arranged between the valve core and the valve seat body.

[0012] In some embodiments, the nut includes a lug, a side wall of the valve core recess has a notch, and the lug of the nut extends out of the notch to prevent the nut from rotating.

[0013] In some embodiments, the screw has a second balancing hole extending vertically therethrough.

[0014] In some embodiments, the two-position three-way electric valve also includes a support frame and a bearing, the support frame is fixed to the upper end of the valve seat body, the bearing is fixed to the upper end of the support frame, the bearing is fixedly connected to the screw rod, and the support frame also includes a longitudinal groove, and the lug of the nut extends into the longitudinal groove to prevent the nut from rotating.

[0015] In some embodiments, the valve seat body includes a connecting seat, a first valve seat having a side wall, and a second valve seat having a side wall, which are fixedly connected in sequence.

[0016] The utility model provides a two-position three-way electric valve, including a valve body, a valve seat, an actuator, and a driving mechanism. The actuator includes a valve core, the nut is connected to the valve core in driving, and the valve core only moves in the vertical direction; the outer periphery of the valve core is provided with a first sealing part and a second sealing part from top to bottom, and the first sealing part or the second sealing part includes a metal skeleton vulcanized rubber sealing ring and a fixed retaining ring; the outer periphery of the valve core is provided with a first sealing part and a second sealing part from top to bottom, and when the valve core is in the lower limit state, the second sealing part closes the connection between the main valve hole and the second outlet; when the valve core is in the upper limit state, that is, the first sealing part closes the inner cavity of the valve seat body between the first valve hole and the second valve hole. The metal skeleton vulcanized sealing ring is used to improve the sealing between the valve core and each sealing seat, and the sealing ring can be prevented from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a two-position three-way electric valve according to an embodiment of the utility model;

[0018] Figure 2 This utility model embodiment Figure 1 Schematic diagram of the three-dimensional structure of a two-position three-way electric valve;

[0019] Figure 3 This utility model embodiment Figure 1Schematic diagram of the valve seat, actuator and drive mechanism (except the coil);

[0020] Figure 4 This utility model embodiment Figure 1 Schematic diagram of valve body structure;

[0021] Figure 5 This utility model embodiment Figure 1 The connection intention of the nut and the valve core is shown;

[0022] Figure 6 This utility model embodiment Figure 1 Schematic diagram of the sealing part;

[0023] Figure 7 This utility model embodiment Figure 1 Schematic diagram of the metal skeleton;

[0024] Figure 8 This utility model embodiment Figure 1 Schematic diagram of a metal skeleton vulcanized rubber sealing ring.

[0025] Among them, the serial number description is: 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 200, valve core 201, first sealing part 202, second sealing part 203, metal frame vulcanized rubber sealing ring 2021, metal frame 20211, rubber 20212, fixed retaining ring 2022, The first balancing hole 204, the retaining ring 205, the first spring 206, the second spring 207; the valve seat 300, the valve seat body 301, the annular make way groove 302, the annular make way groove 303, the first valve hole 304, the second valve hole 305, the second sealing seat 306, the first sealing seat 307, the connecting seat 3011, the first valve seat 3012, the second valve seat 3013, the support frame 4, the groove 401, the bearing 5, the rubber O-ring 27, the rubber O-ring 28, the rubber O-ring 29. DETAILED DESCRIPTION

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers are exaggerated for clarity. The same reference numerals in the drawings represent the same or similar structures, and thus their detailed description will be omitted.

[0027] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be used. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present invention.

[0028] refer to Figures 1 to 8 As shown, according to an embodiment of the present utility model, a two-position three-way electric valve includes a valve body 1, a valve seat 300 arranged on the valve body, an actuator 200 arranged in the valve seat, and a driving mechanism 100 arranged on the actuator and used to drive the actuator.

[0029] A vertical main valve hole 11 is provided in the valve body 1, an inlet 12 and a first outlet 13 connected to the main valve hole are provided on the side of the valve body, a second outlet 14 connected to the main valve hole is provided at the bottom of the valve body, the valve seat 300 includes a hollow valve seat body 301 and two sealing seats arranged in the main valve hole, two annular make way grooves 302 and 303 are provided on the outer peripheral surface of the valve seat body, and the annular make way 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 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 make way grooves, the first outlet 13 is connected to the main valve hole portion corresponding to the uppermost annular make way groove 302, the inlet 12 is connected to the main valve hole portion corresponding to the lowermost annular make way groove 303, the second outlet 14 is connected to the bottom of the main valve hole 11, and the side of the valve seat body 301 is in contact with the inner wall of the main valve hole.

[0030] 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 matched with the screw and drivingly connected to the actuator.

[0031] The actuator 200 includes a valve core 201, and the nut 105 is drivingly connected to the valve core 201, and the valve core only moves in the vertical direction; the outer periphery of the valve core 201 is provided with a first sealing part 202 and a second sealing part 203 from top to bottom, and the first sealing part or the second sealing part includes a metal skeleton vulcanized rubber sealing ring 2021 and a fixed retaining ring 2022; a conical second sealing seat 306 is provided at the connection between the second outlet 14 and the main valve hole, and a conical first sealing seat 307 is provided in the valve seat body between the two annular yield grooves, and the first sealing part and the second sealing part are located between the first sealing seat and the second sealing seat. When the valve core 201 is in the lower limit state, the second sealing part abuts the second sealing seat, that is, the second sealing part closes the connection between the main valve hole and the second outlet; when the valve core 201 is in the upper limit state, the first sealing part abuts the first sealing seat, that is, the first sealing part closes the inner cavity of the valve seat body between the first valve hole and the second valve hole. The upper end of the valve core has a recess, the nut 105 is accommodated in the recess and fixed to the valve core by a retaining ring 205 to prevent the nut from coming out, the nut 105 includes a lug 1051, the side wall of the valve core recess has a notch, the lug of the nut extends out of the notch to prevent the nut from rotating. The valve core has a first balancing hole 204 that runs through the top and bottom, the valve core and the side clearance of the valve seat body are matched, a sealing ring is arranged between the valve core and the valve seat body, and the screw has a second balancing hole 1041 that runs through the top and bottom.

[0032] In this technical solution, the metal frame vulcanized rubber sealing ring is fixed by welding or interference fixing of the fixed retaining ring. Compared with the plastic sealing ring, only a small pressing force is required to ensure the sealing performance, thereby improving the sealing performance between the valve core and each sealing seat, and the rigidity of the metal frame can be used to prevent the sealing ring from being washed off by the fluid. In addition, through the valve core balance structure, the required rotation torque is small, and the valve core only moves up and down without rotating, which reduces the wear between the valve core and the valve seat and improves the sealing performance. Among them, the valve core is fixedly connected by the upper and lower parts, which is convenient for fixing the metal frame vulcanized rubber sealing ring.

[0033] refer to Figure 7 , 8 As shown, in some embodiments, the metal skeleton vulcanized sealing ring 2021 includes an annular metal skeleton 20211 with multiple small holes and rubber 20212. Aluminum or iron is generally used as the skeleton so that the metal skeleton and the rubber are tightly combined to prevent the rubber from falling off.

[0034] refer to Figure 5As shown, in some embodiments, a first spring 206 and a second spring 207 are respectively provided at the upper and lower ends of the nut, the first spring abuts the retaining ring 205 and the nut 105, the second spring abuts the bottom surface of the valve core recess and the nut 105, and the first spring and the second spring have the same specifications. The electric valve is generally controlled by rotating the rotor for a predetermined number of turns, and the rotation error and wear are compensated by the elastic force of the spring. The same spring specifications ensure that the sealing force at the two locations is basically the same.

[0035] refer to 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 also includes a longitudinal groove 401, and the lug of the nut extends into the longitudinal groove to prevent the nut and the valve core from rotating. In other embodiments, the lug is radially extended by a retaining ring to prevent the valve core from rotating, and a special-shaped retaining ring is used to prevent the nut from rotating, which can achieve the design purpose.

[0036] refer to Figure 2 , 3 As shown, 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, which are fixedly connected in sequence, and are connected after being processed separately, thereby reducing the difficulty of parts processing. The side surfaces of the valve seat body on the upper and lower sides of the annular clearance grooves 302 and 303 are provided with rubber O-rings 27, 28, and 29 for sealing the valve seat body and the main valve hole. Except for the coil, the valve seat, the actuator, and the drive mechanism form a whole, which is fixed in the main valve hole 11 of the valve body through the threaded insertion of the connecting seat, and the coil is directly fixed on the end face of the valve body by screws.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. 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. A two-position three-way electric valve, comprising a valve body, a valve seat arranged on the valve body, an actuator arranged in the valve seat, and a driving mechanism arranged on the actuator and used to drive the actuator, wherein 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 of the valve body, and 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 and two sealing seats arranged in the main valve hole, the outer peripheral surface of the valve seat body is provided with two annular ditching grooves, the annular ditching grooves are distributed up and down along the axis of the valve seat body, and the side of the valve seat body is provided with a valve that penetrates the valve seat The first valve hole and the second valve hole of the body, the first valve hole and the second valve hole are respectively located in the two annular make way grooves, the first outlet is communicated with the main valve hole portion corresponding to the uppermost annular make way groove, the inlet is communicated with the main valve hole portion corresponding to the lowermost annular make way groove, the second outlet is communicated with the bottom of the main valve hole, and the side surface of the valve seat body is in contact with the inner wall of the main valve hole; the driving mechanism includes a sleeve, a rotor arranged in the sleeve, a coil arranged outside the sleeve for driving the rotor to rotate, a screw rod fixedly connected to the rotor, and a nut matched with the screw rod and drivingly connected to the actuator, characterized in that, The actuator assembly includes a valve core, the nut is drivingly connected to the valve core, and the valve core only moves in the vertical direction; the outer circumference of the valve core is provided with a first sealing portion and a second sealing portion in sequence from top to bottom, and the first sealing portion or the second sealing portion includes a metal skeleton vulcanized rubber sealing ring and a fixed retaining ring; a conical second sealing seat is provided in the valve seat body at the connection between the second outlet and the main valve hole, and a conical first sealing seat is provided in the valve seat body between the two annular give way grooves, the first sealing portion and the second sealing portion are located between the first sealing seat and the second sealing seat, when the valve core is in the lower limit state, the second sealing portion abuts against the second sealing seat, that is, the second sealing portion closes the connection between the main valve hole and the second outlet; when the valve core is in the upper limit state, the first sealing portion abuts against the first sealing seat, that is, the first sealing portion closes 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 metal frame vulcanized rubber sealing ring comprises an annular metal frame with a plurality of small holes and rubber.

3. The two-position three-way electric valve according to claim 1, characterized in that: The upper end of the valve core is provided with a recessed portion, the nut is accommodated in the recessed portion and a retaining ring is used to prevent the nut from coming out.

4. The two-position three-way electric valve according to claim 3, characterized in that: A first spring and a second spring are respectively arranged at the upper and lower ends of the nut, the first spring abuts against the retaining ring, and the second spring abuts against the bottom surface of the recess.

5. The two-position three-way electric valve according to claim 4, characterized in that: The first spring and the second spring have the same specifications.

6. The two-position three-way electric valve according to claim 1, characterized in that: The valve core has a first balancing hole which passes through from top to bottom. The valve core is clearance-matched with the side surface of the valve seat body. A sealing ring is arranged between the valve core and the valve seat body.

7. The two-position three-way electric valve according to claim 3, characterized in that: The nut comprises a lug, the side wall of the valve core recess has a notch, and the lug of the nut extends out of the notch to prevent the nut from rotating.

8. The two-position three-way electric valve according to claim 1, characterized in that: The screw rod has a second balancing hole which passes through from top to bottom.

9. The two-position three-way electric valve according to claim 7, characterized in that: The two-position three-way electric valve also includes a support frame and a bearing. The support frame is fixed to the upper end of the valve seat body, the bearing is fixed to the upper end of the support frame, the bearing is fixedly connected to the screw rod, and the support frame also includes a longitudinal groove. The lug of the nut extends into the longitudinal groove to prevent the nut from rotating.

10. The two-position three-way electric valve according to claim 1, characterized in that: The valve seat body comprises a connecting seat, a first valve seat with a side wall, and a second valve seat with a side wall which are fixedly connected in sequence.

Images