An electric valve stop structure and an electric valve

Abstract

The present invention discloses an electric valve stop structure and an electric valve. The electric valve comprises an outer cover and a stop structure, a first stop portion arranged on an external threaded member and a second stop portion arranged on an internal threaded member, a cover is fixedly connected to the bottom of the inner cavity of the outer cover, the bottom of the cover is connected to a first connecting pipe, the bottom of the left side of the outer cover is connected to a second connecting pipe, the top of the cover is fixedly connected to a valve core seat, a rotor is arranged at the top of the inner cavity of the outer cover, an external threaded member is arranged in the inner cavity of the rotor, the top of the external threaded member is fixedly connected to an external threaded opposite mounting seat, the outer side of the external threaded member is threadedly connected to an internal threaded member, the inner cavity of the internal threaded member is provided with a valve core, and the valve core approaches or moves away from the valve core seat under the drive of the external threaded member. The stop structure comprises a first stop portion arranged on the external threaded member and a second stop portion arranged on the internal threaded member. The present invention is convenient to assemble, convenient to manufacture, reduces stop noise, improves anti-impact life and other performances.

Description

Technical Field

[0001] The invention relates to the technical field of electric valves, and in particular to an electric valve stop structure and an electric valve. Background Art

[0002] Electric valves are mainly used in refrigeration equipment. They are the core components of variable frequency refrigeration systems. Together with variable frequency compressors, they adjust the flow through the electric valve by changing the flow area of ​​the valve port, so that the refrigeration equipment is always in the best operating condition. Generally, electric valves are driven by stepper motors, but it is necessary to add a stop mechanism inside the electric valve to ensure that the number of opening and closing cycles of the electric valve is constant, which facilitates the control of the electric valve by the microcomputer and reduces the impact of repeated adjustment of the electric valve on the system. Therefore, the stop mechanism is one of the important mechanisms of the electric valve. Since two parts collide when the electric valve stops, improving the anti-collision performance of the stop mechanism and reducing the impact noise are important research topics for electric valves.

[0003] For example, a Chinese patent discloses "a stopper structure" with the patent number: CN101629649A. This patent aims to avoid the use of metal parts for the stopper and reduce the stopper impact sound. In this electric valve, the assembly operation of the rotor shaft and the magnetic rotor to the support component is easy. The rotor shaft and the magnetic rotor are composed of different parts. A fixed upper end limiter is formed on the support component, and a fixed upper end limiter is formed on the support component. A movable upper end limiter is formed on the rotor shaft. The support component, the rotor shaft and the magnetic rotor are formed of resin. The external thread of the rotor shaft is screwed into the internal thread of the support component, and the rotor shaft is installed on the support component. At a position where the movable upper end limiter does not interfere with the fixed upper end limiter, the magnetic rotor is embedded in the clamping part of the rotor shaft and fastened. The magnetic rotor is made into a structure that can be embedded with the clamping part of the rotor shaft on the side opposite to the needle. At the same time, a limiter is provided on the rotor to set the upper limit of the rotor. Since the lower stopper part is relatively small, it is generally formed by integral injection molding with the rotor shaft. Its material is the same as that of the rotor shaft. The rotor shaft requires wear resistance and low friction coefficient, and does not require high impact resistance, while the limiter requires materials with low impact noise and impact resistance. The two are difficult to be compatible. At the same time, the limiter is integrally injection molded with the rotor, and its two limiters are arranged on two parts, which is not conducive to size control and has a certain impact on the stopping accuracy. The limiter is integrally injection molded with the rotor, and its material is magnetic material, which has lower impact resistance. At the same time, the assembly positioning length of the rotor shaft and the rotor is short, which is also very unfavorable for its positioning accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide an electric valve stop structure and an electric valve, which have the advantage of good use effect and solve the problems of traditional stoppers being inconvenient to assemble, difficult to manufacture, having high stopping noise and short anti-impact life.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electric valve stop structure, comprising a first stop portion arranged on an externally threaded component and a second stop portion arranged on an internally threaded component. The first stop portion is mounted on an externally threaded mounting seat arranged on the externally threaded component, the externally threaded mounting seat comprising a first base, the bottom of the first base being fixedly connected to an outer periphery, the first stop portion comprising a first upper stop portion and a first lower stop portion, the inner cavity of the first base being sequentially arranged with the first upper stop portion and the first lower stop portion from bottom to top, the first lower stop portion being arranged on the bottom end surface of the first base, and being formed as a protrusion downward by the first base. The internal threaded part includes a second base, and the second stop portion includes a second upper stop portion and a second lower stop portion. The top of the second base is provided with the second upper stop portion and the second lower stop portion corresponding to the first upper stop portion and the first lower stop portion. The bottom of the surface of the internal threaded part is provided with a brim portion. The present invention integrates the stopping structure on the external threaded mounting seat and the internal threaded part respectively. The stopping mechanism is no longer provided on the external threaded part, which can simplify the structure of the external threaded part and facilitate the stability of the injection molding size of the external threaded part.

[0006] An electric valve comprises an outer cover and the above-mentioned electric valve stopping structure, wherein a cover is fixedly connected to the bottom of the inner cavity of the outer cover, the bottom of the cover is connected to a first connecting pipe, the bottom of the left side of the outer cover is connected to a second connecting pipe, the top of the cover is fixedly connected to a valve core seat, a rotor is arranged at the top of the inner cavity of the outer cover, an externally threaded part is arranged in the inner cavity of the rotor, the top of the externally threaded part is fixedly connected to an externally threaded opposite mounting seat, the outer side of the externally threaded part is threadedly connected to an internally threaded part, and a valve core is arranged in the inner cavity of the internally threaded part, and the valve core is approached or moved away from the valve core seat under the drive of the externally threaded part.

[0007] The outer cover is fixedly connected to the limit block, and the outer cover, the cover cap, the first connecting pipe, the second connecting pipe and the valve core seat form a sealed cavity with an inlet and outlet.

[0008] The external threaded part is sequentially arranged from bottom to top as an external threaded section, a guide section and an external threaded seat.

[0009] The external thread section has a first smooth surface without threads in the axial direction, and the guide section has a second smooth surface. The first smooth surface and the second smooth surface are symmetrical along the plane of the external thread seat, and the first smooth surface and the second smooth surface are connected from bottom to top.

[0010] The inner cavity of the guide section is provided with a central hole.

[0011] The external thread seat is provided with a base, and a through opening groove is provided at the bottom of the base. The width of the opening groove is greater than the guide section, so that the guide section and the external thread section will not be blocked by the external thread seat. A spring mounting half hole and a gasket mounting half hole are sequentially provided at the axis center of the top of the external thread seat from top to bottom. Positioning pin holes are provided on the surface of the external thread seat and on both sides of the spring mounting half hole and the gasket mounting half hole. First grooves are provided at the tops of both sides of the surface of the external thread seat, and second grooves are provided at the tops of both sides of the surface of the first base body. A retaining ring is provided in the inner cavity between the second groove and the first groove.

[0012] The valve core includes a top end and a guide portion, the top end can be movably abutted against the end face of the external threaded part, and the guide portion is embedded in the inner cavity of the center hole; the surface of the top end is provided with a cap portion, a spring and a gasket in sequence from top to bottom, and the valve core and the external threaded part constitute a floating design structure that can move axially, swing with a small displacement and rotate freely.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention can facilitate the assembly and manufacture of the device, reduce the stopping noise, improve the anti-impact life and other performances through the coordinated use of the outer cover, the cover, the first connecting pipe, the second connecting pipe, the valve core seat, the rotor, the external threaded part, the external threaded mounting seat, the internal threaded part and the valve core.

[0015] 2. The present invention ensures the assembly accuracy of the external threaded component and the rotor by setting a guide section and assembling it with the outer periphery, and then cooperating with the inner diameter of the rotor. By setting a retaining ring, the fixation of the external threaded component and the rotor assembly is achieved. By setting a first smooth surface and a second smooth surface, the cavities in the valve can be connected, the pressures in each cavity can be balanced, and the influence of additional pressure on the reliability of product operation can be reduced. In addition, impurities are not easy to accumulate at the bottom of the groove of the thread, so the product has a better ability to resist impurities. By setting a first upper stopper, a first lower stopper, a second upper stopper and a second lower stopper, when the valve is opened to a set opening, the rotor is restricted from further rotating in the valve opening direction, thereby restricting the valve core from moving in the valve opening direction. When the valve is closed to a set opening, the rotor is restricted from further rotating in the valve closing direction, thereby avoiding The valve is caused to be stuck when it passes through the valve and restricts the rotation in the closing direction of the valve. By arranging the first upper stop part and the first lower stop part on the first base, the design structure of the external threaded part can be simplified, thereby ensuring the injection molding accuracy of the thread. More importantly, the external threaded mounting seat and the external threaded part can be made of different materials. For example, the external threaded part requires a material with good wear resistance and a low friction coefficient, while the stop material does not require a high friction coefficient, but has high requirements for impact resistance and low impact sound. Therefore, different materials can be used for the two to maximize the material selection efficiency. By arranging the second upper stop part and the second lower stop part, the upper and lower approximation is mainly used to disperse the impact force on the internal thread during the upper and lower stops, thereby avoiding product impact fatigue failure. By arranging the brim part, the inner wall of the outer cover can be supported to prevent the inner wall of the outer cover from tilting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention.

[0017] Figure 2 It is a left side schematic diagram of the structure of the present invention.

[0018] Figure 3 It is a schematic front view of the external threaded member connection structure of the present invention.

[0019] Figure 4 It is a left schematic view of the external threaded member connection structure of the present invention.

[0020] Figure 5 It is a front view schematic diagram of the internal threaded member connection structure of the present invention.

[0021] Figure 6 It is a cross-sectional schematic diagram of the external threaded mounting seat connection structure of the present invention.

[0022] Figure 7 It is a three-dimensional schematic diagram of the external threaded opposing mounting seat connection structure of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] like Figure 1-7As shown, the present invention includes an outer cover 1, a cover 2 is fixedly connected to the bottom of the inner cavity of the outer cover 1, a first connecting pipe 3 is connected to the bottom of the cover 2, a second connecting pipe 4 is connected to the bottom of the left side of the outer cover 1, a valve core seat 5 is fixedly connected to the top of the cover 2, a rotor 6 is arranged at the top of the inner cavity of the outer cover 1, an external threaded member 7 is arranged in the inner cavity of the rotor 6, and the external threaded member 7 is arranged from bottom to top in sequence as an external threaded section 12, a guide section 13 and an external threaded seat 14, the external threaded section 12 has a first smooth surface 15 without threads in the axial direction, and a second smooth surface 16 is left on the guide section 13, the first smooth surface 15 and the second smooth surface 16 are both symmetrical along the plane of the external threaded seat 14, the first smooth surface 15 and the second smooth surface 16 are connected from bottom to top, and by arranging the first smooth surface 15 and the second smooth surface 16, the valve core can be The cavities are connected to balance the pressure in each cavity, reduce the influence of additional pressure on the reliability of product operation, and impurities are not easy to gather at the bottom of the groove of the thread, so the product has a better ability to resist impurities, the inner cavity of the guide section 13 is provided with a center hole 17, the external thread seat 14 is provided with a base 18, and the bottom of the base 18 is provided with a through opening groove 19, the width of the opening groove 19 is greater than the guide section 13, so that the guide section 13 and the external thread section 12 will not be shielded by the external thread seat 14, and the axis of the top of the external thread seat 14 is provided with a spring mounting half hole 20 and a gasket mounting half hole 21 from top to bottom, and the surface of the external thread seat 14 and on both sides of the spring mounting half hole 20 and the gasket mounting half hole 21 are provided with positioning pin holes 22, and the external thread seat 14 A first groove 23 is provided at the top of both sides of the surface, and an externally threaded counter-mounting seat 8 is fixedly connected to the top of the externally threaded member 7. The externally threaded member 7 and the externally threaded counter-mounting seat 8 are respectively processed by injection molding technology, which is convenient for adding wear-resistant and lubricating substances to the material of the externally threaded member 7 to improve the wear resistance of the external thread. At the same time, the externally threaded member 7 can be made of elastic shock-absorbing materials such as rubber, which can reduce impact and impact sound and optimize the performance of the entire product. At the same time, the externally threaded member 7 is assembled with the externally threaded counter-mounting seat 8 to form a complete installation portion, which is convenient for the reliable assembly of the externally threaded member 7 and the rotor 6. The externally threaded counter-mounting seat 8 includes a first base 24, and the bottom of the first base 24 is fixedly connected to the outer periphery 25, which is assembled with the outer periphery 25 by setting a guide section 13, and then assembled with the rotor The inner diameter of the sub 6 is matched to ensure the assembly accuracy of the external threaded member 7 and the rotor 6. The first stop portion is installed on the external threaded opposite mounting seat arranged on the external threaded member. The first stop portion includes a first upper stop portion and a first lower stop portion. The inner cavity of the first substrate 24 is sequentially provided with a first upper stop portion 26 and a first lower stop portion 27 from bottom to top. The first lower stop portion 27 is arranged on the bottom end surface of the first substrate 24, and is formed by the first substrate 24 to form a protrusion downward. By arranging the first upper stop portion 26 and the first lower stop portion 27 on the first substrate 24, the design structure of the external threaded member 7 can be simplified, thereby ensuring the injection molding accuracy of the thread. More importantly, the external threaded opposite mounting seat 8 and the external threaded member 7 can be made of different materials. For example, the external threaded member 7 requires a material with good wear resistance and low friction coefficient.The stop material does not require a high coefficient of friction, but has high requirements for impact resistance and low impact sound. Therefore, different materials can be used for the two to maximize the material selection efficiency. Second grooves 28 are provided at the tops on both sides of the surface of the first substrate 24. A clamping ring 29 is provided in the inner cavity between the second groove 28 and the first groove 23. By providing the clamping ring 29, the external threaded member 7 and the rotor 6 are fixed. The outer side of the external threaded member 7 is threadedly connected to the internal threaded member 9. The internal threaded member 9 includes a second substrate 30. The second stop portion includes a second upper stop portion and a second lower stop portion. The top of the second substrate 30 is provided with The second upper stop 31 and the second lower stop 32 corresponding to the first upper stop 26 and the first lower stop 27 are provided. By providing the first upper stop 26, the first lower stop 27, the second upper stop 31 and the second lower stop 32, when the valve is opened to the set opening, the rotor 6 is restricted from further rotating in the valve opening direction, thereby restricting the valve core 10 from moving in the valve opening direction. When the valve is closed to the set opening, the rotor 6 is restricted from further rotating in the valve closing direction, thereby avoiding the valve from being stuck due to over-closing and restricting the rotation in the valve closing direction. By providing the second upper stop 31 and the second lower stop 32, which are approximately 180 degrees up and down, the main In order to disperse the impact force of the internal thread during the up and down stops to avoid product impact fatigue failure, a brim portion is provided at the bottom of the surface of the internal threaded part 9. By providing the brim portion, the inner wall of the outer cover 1 can be supported to prevent the inner wall of the outer cover 1 from tilting. A valve core 10 is provided in the inner cavity of the internal threaded part 9. The valve core 10 includes a top end 33 and a guide portion 34. The top end 33 can movably abut against the end face of the external threaded part 7. The guide portion 34 is embedded in the inner cavity of the center hole 17. The surface of the top end 33 is provided with a cap portion 35, a spring 36 and a gasket 37 in sequence from top to bottom. The valve core 10 and the external threaded part 7 form an axially movable The movable embedded design structure can be moved, swung with a small displacement and rotated freely. The bottom of the valve core 10 corresponds to the valve core seat 5 and realizes a sliding connection. The bottom of the left side of the outer cover 1 is fixedly connected to the limit block 11. The outer cover 1, the cover 2, the first pipe 3, the second pipe 4 and the valve core seat 5 constitute a sealed cavity with an inlet and outlet. Through the coordinated use of the outer cover 1, the cover 2, the first pipe 3, the second pipe 4, the valve core seat 5, the rotor 6, the external threaded part 7, the external threaded opposite mounting seat 8, the internal threaded part 9 and the valve core 10, the equipment can be easily assembled and manufactured, reduce the stopping noise, and improve the anti-impact life and other performances.

[0025] When in use, the rotor 6 is placed in the inner cavity of the outer cover 1, and then the externally threaded mounting seat 8 is connected with the externally threaded part 7, and then the externally threaded part 7 and the externally threaded mounting seat 8 are set in the inner cavity of the rotor 6, and then the internally threaded part 9 is assembled with the externally threaded part 7, and then the valve core 10 is assembled in the inner cavity of the internally threaded part 9, and then the valve core seat 5 is assembled with the bottom of the valve core 10, and then the cover 2 is sealed with the bottom of the inner cavity of the outer cover 1, and then the first connecting pipe 3 and the second connecting pipe 4 are welded to the outer cover 1 to complete the assembly.

Claims

1. An electric valve, comprising an outer cover (1) and an electric valve stop structure, Features: The bottom of the inner cavity of the outer cover (1) is fixedly connected to a cover cap (2), the bottom of the cover cap (2) is connected to a first connecting pipe (3), the bottom of the left side of the outer cover (1) is connected to a second connecting pipe (4), the top of the cover cap (2) is fixedly connected to a valve core seat (5), and the outer cover (1), the cover cap (2), the first connecting pipe (3), the second connecting pipe (4) and the valve core seat (5) form a sealed cavity with an inlet and outlet; a rotor (6) is arranged at the top of the inner cavity of the outer cover (1), an externally threaded part (7) is arranged in the inner cavity of the rotor (6), an externally threaded counter-mounting seat (8) is fixedly connected to the top of the externally threaded part (7), an internally threaded part (9) is threadedly connected to the outer side of the externally threaded part (7), and a valve core (10) is arranged in the inner cavity of the internally threaded part (9), and when driven by the externally threaded part, a valve core (10) is arranged in the inner cavity of the internally threaded part (9). The valve core (10) approaches or moves away from the valve core seat (5); the electric valve stop structure comprises a first stop portion arranged on the external threaded component and a second stop portion arranged on the internal threaded component; the first stop portion is mounted on an external threaded mounting seat (8) arranged on the external threaded component (7); the external threaded mounting seat (8) comprises a first base (24); the bottom of the first base (24) is fixedly connected to an outer periphery (25); the first stop portion comprises a first upper stop portion (26) and a first lower stop portion (27); the inner cavity of the first base (24) is provided with the first upper stop portion (26) and the first lower stop portion (27) in sequence from bottom to top; the first lower stop portion (27) is arranged on the bottom end surface of the first base (24) and is formed as a protrusion downward from the first base (24); The internal threaded member (9) comprises a second base (30), the second stop portion comprises a second upper stop portion (31) and a second lower stop portion (32), the second upper stop portion (31) and the second lower stop portion (32) corresponding to the first upper stop portion (26) and the first lower stop portion (27) are arranged at the top of the second base (30), and a brim portion is arranged at the bottom of the surface of the internal threaded member (9); The external threaded member (7) is sequentially arranged from bottom to top as an external threaded section (12), a guide section (13) and an external threaded seat (14); the external threaded seat (14) is provided with a base (18); a through opening groove (19) is provided at the bottom of the base (18); the width of the opening groove (19) is greater than the guide section (13), so that the guide section (13) and the external threaded section (12) are not blocked by the external threaded seat (14); a spring mounting half hole (20) and a gasket mounting half hole (21) are sequentially arranged at the axis center of the top of the external threaded seat (14) from top to bottom, Positioning pin holes (22) are provided on the surface of the external thread seat (14) and on both sides of the spring mounting half hole (20) and the gasket mounting half hole (21); first grooves (23) are provided on the tops of both sides of the surface of the external thread seat (14); second grooves (28) are provided on the tops of both sides of the surface of the first base (24); and a retaining ring (29) is provided in the inner cavity between the second groove (28) and the first groove (23); the valve core (10) and the external thread member (7) form a floating design structure that can move axially, swing with a small displacement, and rotate freely.

2. An electric valve according to claim 1, Features: The outer cover (1) is fixedly connected to the limiting block (11).

3. An electric valve according to claim 1, Features: The external thread section (12) has a first smooth surface (15) without threads in the axial direction, and the guide section (13) has a second smooth surface (16), the first smooth surface (15) and the second smooth surface (16) are both symmetrical along the plane of the external thread seat (14), and the first smooth surface (15) and the second smooth surface (16) are connected from bottom to top.

4. The electric valve according to claim 1, Features: The inner cavity of the guide section (13) is provided with a central hole (17).

5. An electric valve according to claim 4, Features: The valve core (10) comprises a top end (33) and a guide portion (34); the top end (33) is movably abutted against the end surface of the external threaded member (7), and the guide portion (34) is movably embedded in the inner cavity of the center hole (17); the surface of the top end (33) is provided with a cap portion (35), a spring (36) and a gasket (37) in sequence from top to bottom.

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