Electric valve

Abstract

The invention provides an electric valve, and relates to the technical field of valves, the electric valve comprises a valve body and a cover plate installed on one side of the valve body, the cover plate and the valve body are internally provided with a water inlet channel and a water outlet channel respectively, a support is arranged on the upper portion of the interior of the valve body, a valve rod is movably arranged in the support, and the valve rod is used for axial movement; sealing on the two sides of the valve rod is balanced, the contact stress areas of the valve rod and the first sealing ring and the contact stress areas of the valve rod and the second sealing ring are equal, the two sides of the valve rod are in the stress balance state, the valve rod axially advances and retreats to achieve the sealing effect, and when the valve rod moves leftwards to be opened, water enters the water inlet cavity from the water inlet and then enters the water outlet cavity to be discharged; meanwhile, water flow enters the water inlet cavity, the pressure of the water inlet cavity and the pressure of the water inlet cavity are balanced, the valve rod is filled with water, the valve rod is in a stress balance state, in the state, the moving piece can drive the valve rod to move only with small force, the valve is in an open state, the water pressure of incoming water is not affected, and energy consumption and cost are reduced.

Description

Technical Field

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

[0002] A valve is a key device used to control the flow of fluids and regulate flow. It operates through an actuator that drives the valve core and seals the valve to block or open the flow in a pipeline system. In industrial and civil pipeline systems, globe valves are a typical valve type. Their core function is to precisely control the flow of fluids by changing the contact state of the sealing pair through axial displacement or rotation of the valve stem. These valves feature a compact structure and high sealing reliability.

[0003] Existing valves, especially ball valves and traditional stop valves with radial rotary sealing structures, have the following problems:

[0004] 1. Unbalanced sealing force and operating torque defects: The cross-sectional area of the sealing rings on both sides of the valve stem of traditional globe valves is often designed as an asymmetric structure, resulting in unbalanced force on the valve stem under the action of water pressure. It is necessary to rely on a large torsional force to drive the eccentric shaft to overcome the friction resistance of the sealing ring and the water pressure load. Especially under high-pressure conditions, the motor drive torque demand increases nonlinearly with the increase of water pressure, which not only increases the energy consumption and cost of the drive device, but also easily causes wear of the sealing surface and operational stagnation;

[0005] 2. Insufficient control of water hammer effect: Existing valves mostly use vertical flow channels or spherical sealing surfaces. When the water flow is cut off, rigid flow cutoff is easily generated, resulting in a sudden conversion of fluid kinetic energy into pressure energy, triggering a severe water hammer effect, causing pipeline vibration, noise, and fatigue damage to the sealing structure. At the same time, radial rotary sealing structures (such as the spherical seal of ball valves) require extremely high processing precision. Installation errors can easily lead to seal failure, and the sealing performance is significantly affected by medium pressure fluctuations, making it difficult to operate stably under complex working conditions.

[0006] Therefore, the present invention proposes an electric valve to solve the problems existing in the prior art. Summary of the Invention

[0007] In response to the above problems, the present invention proposes an electric valve, in which the sealing forces on both sides of the valve stem are balanced, and the contact areas between the valve stem and the first sealing ring and the second sealing ring are equal, so that both sides of the valve stem are in a force-balanced state, and the valve stem moves axially forward and backward to achieve a sealing effect. When the valve stem moves to the left to open, water enters the water inlet chamber from the water inlet and then enters the water outlet chamber for discharge. At the same time, water flows into the water inlet chamber, and the pressures in the water inlet chamber and the water inlet chamber are balanced. The inside of the valve stem is filled with water, and the valve stem is in a force-balanced state. In this state, the moving part only needs a small force to drive the valve stem to move, so that the valve is in an open state, which has no effect on the water pressure of the incoming water. The motor torque requirement is low, which reduces energy consumption and cost and avoids wear.

[0008] To achieve the objectives of the present invention, the present invention is implemented through the following technical solutions: an electric valve, comprising a valve body and a cover plate mounted on one side of the valve body, wherein the cover plate and the valve body are respectively provided with a water inlet channel and a water outlet channel, a bracket is provided above the interior of the valve body, and a valve stem is movably provided inside the bracket, and the valve stem is configured to move axially;

[0009] One side of the valve stem is movably sealed with one side of the valve body, and the other side of the valve stem is connected to the water inlet channel. The two sides of the outside of the valve stem are respectively balanced and sealed with the two sides of the bracket and the force-bearing areas are equal.

[0010] A further improvement is that a guide positioning column is provided above one side of the interior of the valve body, one side of the valve stem is movably sleeved on the guide positioning column, a water flow groove is provided on the guide positioning column, and a water inlet chamber is provided on the inner side of the guide positioning column at the outer side of the water flow groove.

[0011] A further improvement is that a first sealing ring is provided between one side of the bracket and the upper part of one side of the interior of the valve body, and the first sealing ring is sealed on one side of the exterior of the valve stem.

[0012] A further improvement is that a second sealing ring and a third sealing ring are provided between the bracket and the cover plate, the third sealing ring is located outside the second sealing ring, and the second sealing ring is sealed on the side outside the valve stem away from the first sealing ring.

[0013] A further improvement is that the side of the top of the valve stem close to the second sealing ring is a water-sealing surface, and the water-sealing surface is used to adapt to the second sealing ring to block water flow, the inclined side of the valve stem is a cutoff port, and the top of the valve stem is provided with a movement groove.

[0014] Further improvements are: the valve stem is driven to move by a moving part, the moving part includes a motor, an output shaft and an eccentric seat, the top of the bracket is provided with a first positioning hole, and one side of the top of the valve body is provided with a second positioning hole corresponding to the first positioning hole, the motor is arranged on one side above the valve body, the output shaft is connected to the output end of the motor, and the lower end of the output shaft passes through the second positioning hole, the first positioning hole and is connected to the eccentric seat, and the eccentric seat is adapted to the motion groove.

[0015] A further improvement is that a fourth sealing ring is provided on the inner side of the second positioning hole, and the fourth sealing ring seals on the outer side of the output shaft.

[0016] A further improvement is that: guide grooves are provided on both end surfaces of the bracket, positioning surfaces are provided above both end surfaces inside the valve body, and the bracket is positioned and installed on the positioning surfaces.

[0017] Further improvements are: the water inlet channel includes a water inlet chamber and a water inlet, the water inlet chamber is arranged inside the cover plate, and the water inlet is arranged below the water inlet chamber; the water outlet channel includes a water outlet chamber and a water outlet, the water outlet chamber is arranged below the inside of the valve body, and the water outlet is arranged below the water outlet chamber; one side of the water inlet chamber is connected to the inside of the valve body, and the connection is closed by a valve stem.

[0018] A further improvement is that: one side of the valve body and the other side of the cover plate are both provided with connecting pieces, and fixing holes are provided on the connecting pieces.

[0019] The beneficial effects of the present invention are:

[0020] 1. The seals on both sides of the valve stem of the present invention are balanced, and the contact areas between the valve stem and the first sealing ring and the second sealing ring are equal, so that both sides of the valve stem are in a force-balanced state, and the valve stem moves forward and backward axially to achieve a sealing effect. When the valve stem moves to the left to open, water enters the water inlet chamber from the water inlet and then enters the water outlet chamber for discharge. At the same time, water flows into the water inlet chamber, and the pressures of the water inlet chamber and the water inlet chamber are balanced. The inside of the valve stem is filled with water, and the valve stem is in a force-balanced state. In this state, the moving part only needs a small force to drive the valve stem to move, so that the valve is in an open state, which has no effect on the water pressure of the incoming water. The motor torque requirement is low, which reduces energy consumption and cost and avoids wear.

[0021] 2. The water inlet side of the valve stem of the present invention is an inclined slope structure. When water flows in, it is guided by the slope and flows upward along the slope instead of directly impacting the valve body pipe wall. When the valve begins to close, the tip of the inclined water inlet side is first blocked, but the water sealing surface above the intercepting port still maintains partial flow, thereby performing progressive interception, reducing the water flow velocity in stages, and avoiding instantaneous water flow interception. The tip of the inclined water inlet side is on the lower side. When water flows from the intercepting port, the flow velocity is more evenly distributed on the inclined cross section, reducing the formation of local low-pressure areas, reducing the pressure on the pipe wall, avoiding the generation of asymmetric vortices when water flows into the pipe, and reducing the water hammer effect.

[0022] 3. In the present invention, some air can be reserved in the water inlet chamber. When the valve is suddenly closed and the water hammer effect causes the pressure wave to be transmitted back, the reserved air in the water inlet chamber is compressed to form a buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the front view of the present invention;

[0024] Figure 2 It is a schematic diagram of the splitting of the present invention;

[0025] Figure 3 This is a schematic diagram of the installation of the bracket and valve stem of the present invention;

[0026] Figure 4A closed cross-sectional schematic diagram of the present invention;

[0027] Figure 5 It is a schematic cross-sectional view of the opening of the present invention;

[0028] Figure 6 It is a schematic side view of the interior of the valve body of the present invention;

[0029] Figure 7 This is a schematic diagram of the interior of the valve body of the present invention;

[0030] Figure 8 This is a front view of embodiment 3 of the present invention;

[0031] Figure 9 This is a schematic cross-sectional view of embodiment 3 of the present invention;

[0032] Figure 10 Schematic diagram of the sealing on both sides of the valve stem in embodiment 3 of the present invention.

[0033] Among them: 1. valve body; 2. cover plate; 3. bracket; 4. valve stem; 5. guide and positioning column; 6. water inlet chamber; 7. water flow channel; 8. first sealing ring; 9. second sealing ring; 10. third sealing ring; 11. water sealing surface; 12. intercepting port; 13. movement groove; 14. motor; 15. output shaft; 16. eccentric seat; 17. first positioning hole; 18. second positioning hole; 19. fourth sealing ring; 20. guide groove; 21. positioning surface; 22. water inlet chamber; 23. water inlet; 24. water outlet chamber; 25. water outlet; 26. connecting piece; 27. first end cover; 28. second end cover; 29. water flow channel; 30. grille ring; 31. fifth sealing ring; 32. sixth sealing ring; 33. seventh sealing ring; 34. atmospheric cavity; 35. guide channel; 36. guide slider. DETAILED DESCRIPTION

[0034] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0035] Example 1

[0036] according to Figure 1 、 2 As shown in Figures 3, 4, 5, 6, and 7, this embodiment provides an electric valve, comprising a valve body 1 and a cover plate 2 mounted on one side of the valve body 1. The cover plate 2 and the valve body 1 are provided with a water inlet channel and a water outlet channel respectively. A bracket 3 is provided above the interior of the valve body 1, and a valve stem 4 is movably provided inside the bracket 3. The valve stem 4 is used for axial movement.

[0037] One side of the valve stem 4 is movably sealed with one side of the interior of the valve body 1, and the other side of the valve stem 4 is connected to the water inlet channel. The two sides of the exterior of the valve stem 4 are respectively balanced and sealed with the two sides of the bracket 3 and have equal force areas. When in use, water enters through the water inlet channel, and the valve stem 4 is driven to move by the movable member. When the valve stem 4 moves to the right, the two sides of the valve stem 4 are balanced and sealed by the first sealing ring 8 and the second sealing ring 9. Water can only enter the interior of the valve stem 4 to the water inlet chamber 6 inside the guide positioning column 5. It is sealed by the first sealing ring 8 and cannot flow, achieving the purpose of closing the water flow. When the valve stem 4 moves to the left, the water sealing surface 11 at the upper end of the valve stem 4 leaves the second sealing ring 9 to release the seal, and the water flows through the inclined surface of the intercepting port 12. The inclined surface can be any angle, and flows from the outside of the valve stem 4 to the water outlet chamber 24, enters the water outlet channel and is discharged, thereby achieving the purpose of opening. Whether water enters the water inlet channel, water flows out of the water outlet channel, or water flows out of the water inlet channel, water enters the water outlet channel, can achieve the same effect.

[0038] A guide post 5 is provided above one side of the interior of the valve body 1. One side of the valve stem 4 is movably sleeved on the guide post 5. A water groove 7 is provided on the guide post 5, and a water inlet chamber 6 is provided inside the guide post 5 at a position outside the water groove 7. During use, water is introduced through the water inlet channel, and the valve stem 4 is driven to move by the moving member. When the valve stem 4 moves to the right, both sides of the valve stem 4 are sealed by the first sealing ring 8 and the second sealing ring 9. Water can only enter the interior of the valve stem 4, pass through the water groove 7 of the guide post 5, and enter the water inlet chamber 6. Water is sealed by the first sealing ring 8 and cannot flow, thereby achieving the purpose of shutting off the water flow.

[0039] A first sealing ring 8 is provided between one side of the bracket 3 and the upper portion of one side of the interior of the valve body 1. The first sealing ring 8 seals the outer side of the valve stem 4. A second sealing ring 9 and a third sealing ring 10 are provided between the bracket 3 and the cover plate 2. The third sealing ring 10 is located outside the second sealing ring 9. The second sealing ring 9 seals the outer side of the valve stem 4 away from the first sealing ring 8. The third sealing ring 10 is used to seal the gap between the bracket 3 and the cover plate 2. The contact area between the valve stem 4 and the first sealing ring 8 and the second sealing ring 9 is equal, so that the two sides of the valve stem 4 are in a force balance state, and the valve stem 4 moves forward and backward axially to achieve a sealing effect. When the valve stem 4 moves to the left to open, water enters the water inlet chamber 22 from the water inlet 23, and then enters the water inlet chamber 6. The pressure of the water inlet chamber 22 and the water inlet chamber 6 is balanced. At the same time, the inside of the valve stem 4 is filled with water, and the valve stem 4 is in a force balance state. In this state, the moving part only needs a small force to drive the valve stem 4 to move, so that the valve is in an open state, which has no effect on the water pressure of the incoming water. The torque requirement of the motor 14 is low, which reduces energy consumption and cost and avoids wear.

[0040] The side of the top of the valve stem 4 close to the second sealing ring 9 is a water-sealing surface 11, and the water-sealing surface 11 is used to adapt to the second sealing ring 9 to block water flow. The inclined side of the valve stem 4 is a cutoff port 12, and the top of the valve stem 4 is provided with a movement groove 13. During use, when the valve stem 4 moves to the left, the water-sealing surface 11 at the upper end of the valve stem 4 leaves the second sealing ring 9 to release the seal, and the water flows upward through the inclined surface of the cutoff port 12 and enters the water outlet channel from the outside of the valve stem 4 to be discharged, thereby achieving the purpose of opening. The water inlet side of the valve stem 4 is an inclined slope structure. When water flows in, it is guided by the slope and flows upward along the slope instead of directly impacting the pipe wall of the valve body 1. When the valve begins to close, the tip of the inclined water inlet side is first blocked, but the water sealing surface 11 above the intercepting port 12 still maintains partial flow, thereby performing progressive interception, reducing the water flow velocity in stages, and avoiding instantaneous water flow interruption. The tip of the inclined water inlet side is on the lower side. When the water flows into the intercepting port 12, the flow velocity is more evenly distributed on the inclined cross section, reducing the formation of local low-pressure areas, reducing the pressure on the pipe wall, avoiding the generation of asymmetric vortices when the water flows into the pipeline, and reducing the water hammer effect.

[0041] The valve stem 4 is driven to move by a moving part, which includes a motor 14, an output shaft 15 and an eccentric seat 16. A first positioning hole 17 is provided on the top of the bracket 3, and a second positioning hole 18 corresponding to the first positioning hole 17 is provided on one side of the top of the valve body 1. The motor 14 is provided on one side above the valve body 1. The output shaft 15 is connected to the output end of the motor 14, and the lower end of the output shaft 15 passes through the second positioning hole 18 and the first positioning hole 17 and is connected to the eccentric seat 16. The eccentric seat 16 is adapted to the motion groove 13. A fourth sealing ring 19 is provided on the inner side of the second positioning hole 18, and the fourth sealing ring 19 is sealed on the outside of the output shaft 15. When in use, the motor 14 rotates the output shaft 15, causing the eccentric seat 16 to rotate and adapt to the motion groove 13, thereby driving the valve stem 4 to move axially to open or close the valve. The fourth sealing ring 19 is sealed on the outside of the output shaft 15 to prevent water leakage. The moving part can also be driven by a screw or a cylinder to achieve the purpose of driving the valve stem 4 to move.

[0042] Guide grooves 20 are provided on both end surfaces of the bracket 3, and positioning surfaces 21 are provided above both end surfaces of the valve body 1. The bracket 3 is positioned and installed relative to the positioning surfaces 21. The guide grooves 20 communicate with the water outlet cavity 24, facilitating water flow when the valve is opened. The positioning surfaces 21 are used to support and position the bracket 3, facilitating installation of the bracket 3 within the valve body 1.

[0043] The water inlet channel includes a water inlet chamber 22 and a water inlet 23. The water inlet chamber 22 is arranged inside the cover plate 2, and the water inlet 23 is arranged below the water inlet chamber 22. The water outlet channel includes a water outlet chamber 24 and a water outlet 25. The water outlet chamber 24 is arranged inside the valve body 1, and the water outlet 25 is arranged below the water outlet chamber 24. One side of the water inlet chamber 22 is connected to the interior of the valve body 1, and the connection is closed by the valve stem 4. During use, water enters through the water inlet 23 and the water inlet chamber 22, and the valve stem 4 is driven to move by the moving part. When the valve stem 4 moves to the right, the two sides of the valve stem 4 are balanced and sealed by the first sealing ring 8 and the second sealing ring 9. Water can only enter the interior of the valve stem 4 to the guide positioning column 5, and is sealed by the first sealing ring 8 and cannot flow, thereby achieving the purpose of closing the water flow. When the valve stem 4 moves to the left, the water sealing surface 11 at the upper end of the valve stem 4 leaves the second sealing ring 9 to release the seal, and the water flows upward through the inclined surface of the intercepting port 12, and from the outside of the valve stem 4 to the water outlet chamber 24, enters the water outlet chamber 24, and is discharged from the water outlet 25, thereby achieving the purpose of opening.

[0044] Example 2

[0045] according to Figure 1 、 2 As shown in Figures 3, 4, 5, 6, and 7, this embodiment provides an electric valve, comprising a valve body 1 and a cover plate 2 mounted on one side of the valve body 1. The cover plate 2 and the valve body 1 are provided with a water inlet channel and a water outlet channel respectively. A bracket 3 is provided above the interior of the valve body 1, and a valve stem 4 is movably provided inside the bracket 3. The valve stem 4 is used for axial movement.

[0046] One side of the valve stem 4 is movably sealed with one side of the interior of the valve body 1, and the other side of the inclined surface of the valve stem 4 is connected to the water inlet channel. The two sides of the outside of the valve stem 4 are respectively matched with the two sides of the bracket 3 in a balanced seal. When in use, water enters through the water inlet channel, and the valve stem 4 is driven to move by the movable member. When the valve stem 4 moves to the right, the two sides of the valve stem 4 are balanced and sealed by the first sealing ring 8 and the second sealing ring 9. Water can only enter the interior of the valve stem 4 to the water inlet chamber 6 inside the guide positioning column 5. It is sealed by the first sealing ring 8 and cannot circulate, achieving the purpose of closing the water flow. When the valve stem 4 moves to the left, the water sealing surface 11 at the upper end of the valve stem 4 leaves the second sealing ring 9 to release the seal, and the water flows upward through the inclined surface of the intercepting port 12, and from the outside of the valve stem 4 to the water outlet chamber 24, enters the water outlet channel and is discharged, thereby achieving the purpose of opening. Regardless of whether water enters the water inlet channel and water exits the water outlet channel, or water exits the water inlet channel and water enters the water outlet channel, the same effect can be achieved.

[0047] One side of the valve body 1 and the other side of the cover plate 2 are both provided with a connecting piece 26, and a fixing hole is provided on the connecting piece 26. When in use, the valve as a whole can be fixed to the installation base surface by fitting bolts through the fixing holes on the connecting piece 26.

[0048] Experimental data:

[0049] index The present invention Traditional valves Service life (10,000 times) 120 80 Withstand voltage test (MPa) 10 6 Water hammer effect reduction rate (%) 85 50 Friction coefficient 0.15 0.3 Maintenance cycle (year) 5 3

[0050] Example 3

[0051] according to Figure 8 、 9 As shown in Figures 10 and 10, this embodiment provides an electric valve, comprising a valve body 1 and a first end cover 27 and a second end cover 28 mounted on both sides of the valve body 1. The first end cover 27 and the second end cover 28 are provided with a water inlet channel and a water outlet channel respectively. A bracket 3 is provided above the interior of the valve body 1, and a valve stem 4 is movably provided inside the bracket 3. The valve stem 4 is configured for axial movement.

[0052] A water passage 29 is provided at the lower portion of the interior of the valve body 1, connecting the water inlet and outlet channels. One end of the water passage 29 is connected to the water inlet channel via a grille ring 30. The left side of the valve stem 4 is movably sealed against the upper portion of the interior of the second end cap 28, and the other inclined surface of the valve stem 4 is connected to the water inlet channel. The two sides of the exterior of the valve stem 4 are respectively fitted with the two sides of the bracket 3 in a balanced and sealed manner, and the force-bearing areas are equal. The inclined end of the valve stem 4 is used to seal the grille ring 30. During use, water is admitted through the water inlet channel, and the valve stem 4 is driven to move by the movable member. When the valve stem 4 moves to the right, both sides of the valve stem 4 are balanced and sealed, and water can only enter the interior of the valve stem 4 and cannot circulate, thereby achieving the purpose of closing the water flow. When the valve stem 4 moves to the left, the lower end of the valve stem 4 is unsealed, exposing the gap in the grille ring 30. Water flows through the grille ring 30, enters the water passage 29, and is discharged from the water outlet channel, thereby achieving the purpose of opening. No matter water is flowing in through the water inlet channel and flowing out through the water outlet channel, or water is flowing out through the water inlet channel and flowing in through the water outlet channel, the same effect can be achieved.

[0053] A fifth sealing ring 31 and a sixth sealing ring 32 are respectively provided on both sides of the grille ring 30, and a seventh sealing ring 33 is provided between the left side of the bracket 3 and the upper part of the second end cover 28. The two sides of the valve stem 4 pass through the fifth sealing ring 31, the sixth sealing ring 32 and the seventh sealing ring 33 respectively and are sealed. The two sides of the valve stem 4 are in a force balance state, and the valve stem 4 moves forward and backward axially to achieve a sealing effect. When the valve stem 4 moves to the left to open, the right side of the valve stem 4 breaks away from the fifth sealing ring 31, but is still sealed by the sixth sealing ring 32, exposing the gap below the grille ring 30. Water flows through the grille ring 30, enters the water passage, and is discharged from the water outlet channel, thereby achieving the purpose of opening. When the valve stem 4 moves to the right, the fifth sealing ring 31 and the sixth sealing ring 32 seal the valve stem 4, and the valve stem 4 blocks the grille ring 30, thereby closing the water flow. At the same time, the valve stem 4 is filled with water and is in a force-balanced state. In this state, the moving part only needs a small force to drive the valve stem 4 to move, so that the valve is in an open state, which does not affect the water pressure of the incoming water. The torque requirement of the motor 14 is low, which reduces energy consumption and cost and avoids wear.

[0054] The right side of the valve stem 4 is an inclined surface, and the top of the valve stem 4 is provided with a movement groove 13. The water inlet side of the valve stem 4 is an inclined inclined surface structure. When water flows in, it is guided by the inclined surface and flows downward along the inclined surface rather than directly impacting the pipe wall of the valve body 1. When the valve begins to close, the inclined water inlet side performs a progressive interception, which reduces the water flow velocity in stages, avoiding instantaneous water flow interruption. The flow velocity is more evenly distributed across the inclined cross section, reducing the formation of local low-pressure areas, reducing the pressure on the pipe wall, avoiding the generation of asymmetric vortices when water flows into the pipe, and reducing the water hammer effect.

[0055] The valve stem 4 is driven to move by a moving member, which includes a motor 14, an output shaft 15, and an eccentric seat 16. The motor 14 is arranged on one side above the valve body 1, and the output shaft 15 is connected to the output end of the motor 14. The lower end of the output shaft 15 is connected to the eccentric seat 16, and the eccentric seat 16 is adapted to the motion groove 13. When in use, the motor 14 rotates the output shaft 15, causing the eccentric seat 16 to rotate and adapt to the motion groove 13, thereby driving the valve stem 4 to move axially, thereby opening or closing the valve.

[0056] An air chamber 34 is provided between the outer side of the axial end of the eccentric seat 16 and the valve body, which, in conjunction with the sixth sealing ring 32 and the seventh sealing ring 33, isolates water, preventing it from entering and affecting the motor 14, thereby preventing water leakage. The moving member can also be driven by a screw or a cylinder to achieve the purpose of driving the valve stem 4.

[0057] A guide path 35 is provided at the lower part of the bracket 3, and a guide slider 36 adapted to the guide path 35 is provided at the lower end of the valve stem 4. During the movement of the valve stem 4, the guide slider 36 is movably adapted to the guide path 35, making the movement of the valve stem 4 more stable.

[0058] The water inlet channel includes a water inlet chamber 22 and a water inlet 23. The water inlet chamber 22 is arranged inside the first end cover 27, and the water inlet 23 is arranged below the water inlet chamber 22. The water outlet channel includes a water outlet chamber 24 and a water outlet 25. The water outlet chamber 24 is arranged inside the second end cover 28, and the water outlet 25 is arranged below the water outlet chamber 24. The lower part of the valve body 1 is connected to the water inlet channel and the water outlet channel through a water passage 29. When in use, water enters through the water inlet 23 and the water inlet chamber 22, and the valve stem 4 is driven to move by the moving part. When the valve stem 4 moves to the right, both sides of the valve stem 4 are balanced and sealed, and water can only enter the interior of the valve stem 4 and cannot circulate, thereby achieving the purpose of closing the water flow. When the valve stem 4 moves to the left, the lower end of the valve stem 4 is unsealed, exposing the gap of the grille ring 30. Water flows through the grille ring 30, enters the water passage 29, and then enters the water outlet chamber 24 and is discharged from the water outlet 25, thereby achieving the purpose of opening.

[0059] The seals on both sides of the electric valve stem 4 are balanced, and the contact areas between the valve stem 4 and the first sealing ring 8 and the second sealing ring 9 are equal, so that both sides of the valve stem 4 are in a force-balanced state, and the valve stem 4 moves forward and backward axially to achieve a sealing effect. When the valve stem 4 moves to the left to open, water enters the water inlet chamber 22 from the water inlet 23, and then enters the water outlet chamber 24 for discharge. At the same time, water flows into the water inlet chamber 6, and the pressures of the water inlet chamber 22 and the water inlet chamber 6 are balanced. The inside of the valve stem 4 is filled with water, and the valve stem 4 is in a force-balanced state. In this state, the moving part only needs a small force to drive the valve stem 4 to move, so that the valve is in an open state, which has no effect on the water pressure of the incoming water. The torque requirement of the motor 14 is low, which reduces energy consumption and cost and avoids wear. The water inlet side of the valve stem 4 is an inclined slope structure. When water flows in, it is guided by the slope and flows upward along the slope instead of directly impacting the pipe wall of the valve body 1. When the valve begins to close, the tip of the inclined water inlet side is first blocked, but the water sealing surface 11 above the intercepting port 12 still maintains partial flow, thereby performing progressive interception, reducing the water flow velocity in stages, and avoiding instantaneous water flow interruption. The tip of the inclined water inlet side is on the lower side. When water flows from the intercepting port 12, the flow velocity is more evenly distributed on the inclined cross section, reducing the formation of local low-pressure areas, reducing the pressure on the pipe wall, avoiding the generation of asymmetric vortices when water flows into the pipe, and reducing the water hammer effect. At the same time, some air can be reserved in the water inlet chamber 6. When the valve is suddenly closed, causing the water hammer effect to generate a pressure wave back, the reserved air in the water inlet chamber 6 is compressed, forming a buffering effect.

[0060] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric valve comprising a valve body (1) and a cover plate (2) mounted on one side of the valve body (1), characterized in that: A water inlet channel and a water outlet channel are respectively provided inside the cover plate (2) and the valve body (1); a bracket (3) is provided above the inside of the valve body (1); and a valve stem (4) is movably provided inside the bracket (3); the valve stem (4) is used for axial movement; One side of the valve stem (4) is movably sealed with one side of the interior of the valve body (1), and the other side of the inclined surface of the valve stem (4) is connected to the water inlet channel. The two sides of the exterior of the valve stem (4) are respectively matched with the two sides of the bracket (3) in a balanced seal and have equal force-bearing areas.

2. The electric valve according to claim 1, characterized in that: A guide positioning column (5) is provided above one side of the interior of the valve body (1), one side of the valve stem (4) is movably sleeved on the guide positioning column (5), a water flow groove (7) is provided on the guide positioning column (5), and a water inlet chamber (6) is provided on the inner side of the guide positioning column (5) at a position outside the water flow groove (7).

3. The electric valve according to claim 1, characterized in that: A first sealing ring (8) is provided between one side of the bracket (3) and the upper portion of one side of the interior of the valve body (1), and the first sealing ring (8) is sealed on one side of the exterior of the valve stem (4).

4. The electric valve according to claim 3, characterized in that: A second sealing ring (9) and a third sealing ring (10) are provided between the bracket (3) and the cover plate (2); the third sealing ring (10) is located outside the second sealing ring (9); and the second sealing ring (9) is sealed on the side of the valve stem (4) away from the first sealing ring (8).

5. The electric valve according to claim 4, characterized in that: The side of the top of the valve stem (4) close to the second sealing ring (9) is a water sealing surface (11), and the water sealing surface (11) is used to adapt to the second sealing ring (9) to block water flow, the inclined side of the valve stem (4) is a cutoff port (12), and the top of the valve stem (4) is provided with a movement groove (13).

6. The electric valve according to claim 1, characterized in that: The valve stem (4) is driven to move by a moving part, and the moving part includes a motor (14), an output shaft (15) and an eccentric seat (16). A first positioning hole (17) is provided on the top of the bracket (3), and a second positioning hole (18) corresponding to the first positioning hole (17) is provided on one side of the top of the valve body (1). The motor (14) is provided on one side above the valve body (1), and the output shaft (15) is connected to the output end of the motor (14), and the lower end of the output shaft (15) passes through the second positioning hole (18), the first positioning hole (17) and is connected to the eccentric seat (16), and the eccentric seat (16) is adapted to the motion groove (13).

7. The electric valve according to claim 6, characterized in that: A fourth sealing ring (19) is provided on the inner side of the second positioning hole (18), and the fourth sealing ring (19) seals on the outer side of the output shaft (15).

8. The electric valve according to claim 1, characterized in that: Both end surfaces of the bracket (3) are provided with guide grooves (20), and above both end surfaces inside the valve body (1) are provided with positioning surfaces (21), and the bracket (3) is positioned and installed with the positioning surfaces (21).

9. The electric valve according to claim 1, characterized in that: The water inlet channel comprises a water inlet chamber (22) and a water inlet (23), wherein the water inlet chamber (22) is arranged inside the cover plate (2), and the water inlet (23) is arranged below the water inlet chamber (22); the water outlet channel comprises a water outlet chamber (24) and a water outlet (25), wherein the water outlet chamber (24) is arranged inside the valve body (1), and the water outlet (25) is arranged below the water outlet chamber (24); one side of the water inlet chamber (22) is communicated with the interior of the valve body (1), and the communication portion is closed by a valve stem (4).

10. An electric valve according to any one of claims 1 to 9, characterized in that: One side of the valve body (1) and the other side of the cover plate (2) are both provided with a connecting piece (26), and a fixing hole is provided on the connecting piece (26).

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