Electric valve

Abstract

The utility model discloses an electric valve which comprises a coil assembly, a rotor assembly, a valve element assembly, a connecting seat assembly, a valve seat assembly and a valve body. The valve body is provided with a first cavity communicating with the outside and a second cavity communicating with the outside, and the first cavity communicates with the second cavity through a third cavity. The third cavity extends towards the upper part of the valve body, and the extended cavity forms a mounting cavity; the rotor assembly comprises a shell, magnetic steel and a connecting plate; the magnetic steel and the connecting plate are fixed and rotationally connected in the shell; the shell is mounted at the upper part of the mounting cavity and the lower end of the shell is open; the valve element assembly comprises a valve rod, a bearing, a valve element sleeve, a valve element spring and a valve element. The upper end of the valve rod extends into the shell and is fixedly connected with the connecting plate, the valve element sleeve is rotationally connected to the lower portion of the valve rod through the bearing, and the valve element is connected to the lower end of the valve element sleeve. The structure of the valve element assembly is optimized, and the valve element is prevented from being affected by inlet pressure and outlet pressure.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to an electric valve. Background Art

[0002] The flow control valve in the existing automobile air conditioning circuit has the following three problems:

[0003] 1. Two-way circulation and closure cannot be achieved.

[0004] 2. Large diameter and large internal leakage.

[0005] 3. The valve structure is complex and large in size.

[0006] The current electric valves have not made corresponding improvements to address the above problems, so there is an urgent need to solve the above problems. Utility Model Content

[0007] In view of the defects in the prior art, the structure of the valve core assembly is optimized to avoid the valve core being affected by the inlet and outlet pressures. The utility model provides an electric valve, including a coil assembly, a rotor assembly, a valve core assembly, a connecting seat assembly, a valve seat assembly and a valve body; the valve body is provided with a first cavity connected to the outside and a second cavity connected to the outside, and the first cavity and the second cavity are connected through a third cavity; the third cavity extends to the upper part of the valve body, and the extended cavity forms an installation cavity; the rotor assembly includes an outer shell, a magnet and a connecting plate; the magnet and the connecting plate are fixedly and rotatably connected to the outer shell; the outer shell is installed in the upper part of the installation cavity and the lower end of the outer shell is open; the valve core assembly includes a valve stem, a bearing, a valve core sleeve, a valve core spring and a valve core; the upper end of the valve stem extends into the outer shell and is fixedly connected to the connecting plate, the valve core sleeve is rotatably connected to the lower part of the valve stem through the bearing, the valve core is connected to the lower end of the valve core sleeve, and the inner cavity of the valve core sleeve is connected to the inner cavity of the valve core; the valve core spring is compressed between the lower end of the valve stem and the valve core;

[0008] The connecting seat assembly and the valve seat assembly are both sleeved on the outside of the valve core assembly, the upper part of the connecting seat assembly extends into the shell and is connected to the outside of the valve stem by threads, and the middle part of the connecting seat assembly extends out of the shell and is fixedly connected to the valve body; the valve seat assembly is connected to the lower end of the connecting seat assembly, and the coil assembly is sleeved on the outside of the shell, and the magnetic steel drives the valve stem to rotate by energizing the coil, thereby causing the valve core to slide along the inner cavity of the connecting seat assembly and the valve seat assembly; the side of the valve seat assembly is provided with a side hole corresponding to the first cavity, and the bottom wall of the valve seat assembly is provided with a bottom hole connected to the third cavity, and the valve core slides up and down to control the opening and closing of the first cavity and the third cavity; the valve core sleeve is provided with a first flow hole, and the valve core is provided with a second flow hole, and the first flow hole and the second flow hole are used to connect the upper and lower parts of the valve core to balance the pressure difference between the upper and lower parts of the valve core.

[0009] The beneficial effect of the device is that the bearing makes the valve stem rotate without rotating the valve core sleeve and the valve core together, but the valve stem moves up and down with the valve core sleeve and the valve core together. That is, the friction resistance of the valve core moving in the connecting seat assembly is greatly reduced, and the first flow hole and the second flow hole balance the pressure on the upper and lower sides of the valve core. Therefore, there is no pressure difference in the process of the valve core assembly moving up and down, and only the friction of the moving parts can be adjusted in both directions.

[0010] Preferably, the valve core sleeve and the valve core are connected by threads, and a sliding sheet and an O-ring are provided between the valve core sleeve and the valve core.

[0011] Preferably, the first flow holes are provided in plurality, and all the first flow holes are distributed along the circumferential direction on the side wall of the valve core sleeve. The plurality of first flow holes can ensure that the flow rate is large enough, the flow is not blocked, and the balancing effect is better.

[0012] Preferably, the valve stem is provided with a valve stem sleeve for limiting the axial movement of the bearing. The valve stem sleeve can avoid the problem of bearing misalignment and falling off, and can ensure axial sliding while rotating.

[0013] Preferably, the valve seat assembly includes a valve seat, a sealing ring gasket and a sealing ring; the inner side of the valve seat is provided with an annular step opposite to the lower end of the valve core, the sealing ring and the sealing ring gasket are sequentially installed on the annular step, the side hole of the valve seat assembly is located on the side wall of the valve seat, and the lower end of the valve core contacts the sealing ring and the sealing ring gasket, thereby blocking the side hole of the valve seat and the third cavity. The lower end of the valve core is a sealing contact end; the sealing ring gasket and the sealing ring are provided with an annular groove adapted to the sealing contact end. The sealing ring and the sealing ring gasket are provided with an annular groove adapted to the sealing contact end, thereby achieving different flow curve requirements.

[0014] Preferably, the valve seat is provided with a plurality of side holes, and all the side holes are evenly distributed along the circumference of the valve seat.

[0015] Preferably, the sealing ring is made of PTFE. The sealing ring is made of PTFE, which can achieve better sealing performance and reduce the leakage in the valve port. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1 It is a structural schematic diagram of this embodiment;

[0018] Figure 2 for Figure 1 Left view of

[0019] Figure 3 for Figure 2 Sectional view along AA direction;

[0020] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0021] Figure 5 for Figure 1 Schematic diagram of the connection between the middle rotor assembly, the valve core assembly, the connecting seat assembly and the valve seat assembly;

[0022] Figure 6 Schematic diagram of the valve core sleeve in this embodiment;

[0023] Figure 7 for Figure 6 Stereoscopic image of

[0024] Figure 8 Schematic diagram of the internal structure of the valve seat in this embodiment.

[0025] In the accompanying drawings, there are a coil assembly 1, a connecting seat assembly 2, a valve body 3, a first cavity 4, a second cavity 5, a third cavity 6, an installation cavity 7, a housing 8, a magnet 9, a connecting plate 10, a valve stem 11, a bearing 12, a valve core sleeve 13, a valve core spring 14, a valve core 15, a valve stem sleeve 16, a sliding sheet 17, an O-ring 18, a side hole 19, a bottom hole 20, a first flow hole 21, a second flow hole 22, a valve seat 23, a sealing ring gasket 24, a sealing ring 25, an annular step 26, a sealing contact end 27, a ring groove 28, and a wiring terminal 29. DETAILED DESCRIPTION

[0026] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0027] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0028] like Figures 1 to 3 As shown, this embodiment provides an electric valve, including a coil assembly 1, a rotor assembly, a valve core assembly, a connection seat assembly 2, a valve seat 23 assembly and a valve body 3. The valve body 3 is provided with a first cavity 4 communicating with the outside and a second cavity 5 communicating with the outside, and the first cavity 4 and the second cavity 5 are connected through a third cavity 6. The third cavity 6 extends toward the upper part of the valve body 3, and the extended cavity forms an installation cavity 7.

[0029] The specific structure of the rotor assembly in this embodiment is as follows:

[0030] The rotor assembly includes a housing 8, a magnetic steel 9 and a connecting plate 10; the magnetic steel 9 and the connecting plate 10 are fixedly and rotatably connected in the housing 8; the housing 8 is installed in the upper part of the installation cavity 7 and the lower end of the housing 8 is open.

[0031] The specific structure of the valve core assembly in this embodiment is as follows:

[0032] like Figure 3 and Figure 5 As shown, the valve core assembly includes a valve stem 11, a bearing 12, a valve core sleeve 13, a valve core spring 14 and a valve core 15; the upper end of the valve stem 11 extends into the housing 8 and is fixedly connected to the connecting plate 10, and the valve core sleeve 13 is rotatably connected to the lower part of the valve stem 11 through the bearing 12. The valve stem 11 is provided with a valve stem sleeve 16 that limits the axial movement of the bearing 12. The valve stem sleeve 16 can avoid the problem of misalignment and falling off of the bearing 12, and can ensure axial sliding while rotating. The valve core 15 is connected to the lower end of the valve core sleeve 13, and the inner cavity of the valve core sleeve 13 is connected to the inner cavity of the valve core 15. Specifically, the valve core sleeve 13 and the valve core 15 are connected by threads, and a sliding sheet 17 and an O-ring 18 are provided between the valve core sleeve 13 and the valve core 15. In addition, the valve core spring 14 is pressed between the valve stem 11 and the valve core 15. The valve core 15 will compress the valve core spring 14 upward, and the spring potential energy provides elastic force for the valve core 15 to return to its original position.

[0033] like Figure 1 , Figure 5 and Figure 8 As shown, the connection seat assembly 2 and the valve seat 23 assembly in this embodiment are both sleeved on the outside of the valve core assembly, the upper part of the connection seat assembly 2 extends into the housing 8 and is connected to the outside of the valve stem 11 by threads, and the middle part of the connection seat assembly 2 extends out of the housing 8 and is fixedly connected to the valve body 3. The valve seat 23 assembly is connected to the lower end of the connection seat assembly 2, and the coil assembly 1 is sleeved on the outside of the housing 8. The magnetic steel 9 drives the valve stem 11 to rotate by energizing the coil, and then the valve core 15 slides along the inner cavity of the connection seat assembly 2 and the valve seat 23 assembly. Specifically, the side of the valve seat 23 assembly is provided with a side hole 19 corresponding to the first cavity 4, and the bottom wall of the valve seat 23 assembly is provided with a bottom hole 20 connected to the third cavity 6, and the valve core 15 slides up and down to control the opening and closing of the first cavity 4 and the third cavity 6.

[0034] The valve core sleeve 13 in this embodiment is provided with a first flow hole 21, and the valve core 15 is provided with a second flow hole 22. The first flow hole 21 and the second flow hole 22 are connected to the upper and lower parts of the valve core 15 to balance the pressure difference between the upper and lower parts of the valve core 15. Specifically, the first flow hole 21 is connected between the inner cavity outside the valve core sleeve 13 and the inner cavity inside the valve core sleeve 13, and the second flow hole 22 is connected between the inner cavity outside the valve core 15 and the inner cavity inside the valve core 15, and the valve core sleeve 13 is connected to the valve core 15. Therefore, during the sliding process of the valve core 15 and the valve core sleeve 13, the pressure above and below the valve core 15 is equal, and there is no pressure difference. There are multiple first flow holes 21, and the number of the first flow holes 21 is determined according to the diameter of the valve core sleeve 13, which is not limited in this embodiment. All the first flow holes 21 are distributed on the side wall of the valve core sleeve 13 along the circumferential direction. Multiple first flow holes 21 can ensure that the flow rate is large enough, there is no obstruction to the flow, and the balancing effect is better.

[0035] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the valve seat 23 assembly in this embodiment includes a valve seat 23, a sealing ring 25 gasket 24 and a sealing ring 25; the inner side of the valve seat 23 is provided with an annular step 26 opposite to the lower end of the valve core 15, and the sealing ring 25 and the sealing ring 25 gasket 24 are sequentially installed on the annular step 26, and the side hole 19 of the valve seat 23 assembly is located on the side wall of the valve seat 23, and the valve seat 23 is provided with a plurality of side holes 19, and all the side holes 19 are evenly distributed along the circumference of the valve seat 23. The lower end of the valve core 15 contacts the sealing ring 25 and the sealing ring 25 gasket 24, thereby blocking the side hole 19 of the valve seat 23 and the third cavity 6. The lower end of the valve core 15 is a sealing contact end 27, and the sealing ring 25 gasket 24 and the sealing ring 25 are provided with an annular groove 28 adapted to the sealing contact end 27. The sealing ring 25 is made of PTFE material, which can achieve better sealing performance, thereby reducing the leakage in the valve port. The sealing ring 25 and the sealing ring 25 gasket 24 are provided with an annular groove 28 adapted to the sealing contact end 27, so as to achieve different flow curve requirements.

[0036] In this embodiment, the first flow hole 21 of the valve core sleeve 13 and the second flow hole 22 of the valve core can realize the circulation between the installation cavity 7 and the third cavity 6, and realize the pressure balance. Therefore, there is no pressure difference in the process of the valve core assembly moving up and down, and there is only the friction of the moving parts. The side of the coil assembly 1 is provided with a wiring terminal 29. After power is turned on, the coil assembly 1 drives the rotor assembly to rotate, and the rotor assembly drives the valve stem 11 to rotate. The internal thread on the upper part of the connecting seat assembly 2 cooperates with the external thread on the upper part of the valve stem 11. The connecting seat assembly 2 is fixed on the valve body 3. The valve stem 11 rotates, and the valve stem 11 moves up and down through the thread pair. Due to the presence of the bearing 12, the rotation of the valve stem 11 will not cause the valve core and the valve core sleeve 13 to rotate, but will cause the valve core and the valve core sleeve 13 to slide up and down together, thereby realizing the adjustment of the flow cross-sectional area of ​​the valve port.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. An electric valve, characterized in that: It includes a coil assembly, a rotor assembly, a valve core assembly, a connecting seat assembly, a valve seat assembly and a valve body; The valve body is provided with a first cavity communicating with the outside and a second cavity communicating with the outside, and the first cavity and the second cavity are communicated with each other through a third cavity; the third cavity extends toward the upper part of the valve body, and the extended cavity forms an installation cavity; The rotor assembly comprises a housing, a magnetic steel and a connecting plate; the magnetic steel and the connecting plate are fixedly and rotatably connected in the housing; the housing is installed at the upper part of the installation cavity and the lower end of the housing is open; The valve core assembly includes a valve stem, a bearing, a valve core sleeve, a valve core spring and a valve core; the upper end of the valve stem extends into the housing and is fixedly connected to the connecting plate, the valve core sleeve is rotatably connected to the lower part of the valve stem through the bearing, the valve core is connected to the lower end of the valve core sleeve, and the inner cavity of the valve core sleeve is communicated with the inner cavity of the valve core; the valve core spring is compressed between the lower end of the valve stem and the valve core; The connecting seat assembly and the valve seat assembly are both sleeved on the outside of the valve core assembly, the upper part of the connecting seat assembly extends into the housing and is connected to the outside of the valve stem through threads, and the middle part of the connecting seat assembly extends out of the housing and is fixedly connected to the valve body; the valve seat assembly is connected to the lower end of the connecting seat assembly, and the coil assembly is sleeved on the outside of the housing, and the magnetic steel drives the valve stem to rotate by energizing the coil, thereby causing the valve core to slide along the inner cavity of the connecting seat assembly and the valve seat assembly; The side of the valve seat assembly is provided with a side hole corresponding to the first cavity, and the bottom wall of the valve seat assembly is provided with a bottom hole connected to the third cavity, and the valve core slides up and down to control the opening and closing of the first cavity and the third cavity; the valve core sleeve is provided with a first flow hole, and the valve core is provided with a second flow hole. The first flow hole and the second flow hole are used to connect the top and bottom of the valve core to balance the pressure difference between the top and bottom of the valve core.

2. An electric valve according to claim 1, characterized in that: The valve core sleeve and the valve core are connected by threads, and a sliding sheet and an O-ring are arranged between the valve core sleeve and the valve core.

3. The electric valve according to claim 1, characterized in that: There are a plurality of first flow holes, and all of the first flow holes are distributed along the circumferential direction on the side wall of the valve core sleeve.

4. The electric valve according to claim 1, characterized in that: The valve stem is provided with a valve stem sleeve which limits the axial movement of the bearing.

5. The electric valve according to claim 1, characterized in that: The valve seat assembly includes a valve seat, a sealing ring gasket and a sealing ring; the inner side of the valve seat is provided with an annular step opposite to the lower end of the valve core, and the sealing ring and the sealing ring gasket are installed on the annular step in sequence. The side hole of the valve seat assembly is located on the side wall of the valve seat, and contacts with the sealing ring and the sealing ring gasket through the lower end of the valve core, thereby blocking the side hole of the valve seat and the third cavity.

6. An electric valve according to claim 5, characterized in that: The lower end of the valve core is a sealing contact end; the sealing ring gasket and the sealing ring are provided with an annular groove adapted to the sealing contact end.

7. The electric valve according to claim 5, characterized in that: The valve seat is provided with a plurality of side holes, and all the side holes are evenly distributed along the circumference of the valve seat.

8. The electric valve according to claim 6, characterized in that: The sealing ring is made of PTFE.

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