Segmented control electromagnetic valve

Abstract

The segmented control electromagnetic valve comprises a valve seat, an opening and closing piece, a transmission piece and a stop piece, and a valve cavity and a fluid channel which are communicated are formed in the valve seat; the opening-closing piece is located in the valve cavity and can move up and down to open and close the port of the fluid channel; the transmission part is connected with the opening and closing part and can move under the action of the electromagnetic driving assembly; the transmission part comprises a first valve rod and a second valve rod which are used in cooperation, the first valve rod is connected with the opening and closing part through an elastic part, the second valve rod is arranged on the first valve rod in a sliding mode, and the second valve rod is provided with an abutting-pushing arm capable of abutting against the opening and closing part. The stop piece comprises an upper stop block and a lower stop block which are used for limiting the moving range of the second valve rod. According to the invention, the opening change of the valve can be adjusted, so that the control precision of liquid flow can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to a segmentally controlled solenoid valve. Background Art

[0002] Solenoid valves are basic components for electromagnetically controlling fluids. They are often used in industrial control systems to adjust the direction, flow, speed or other parameters of fluids. In existing solenoid valves, the valve opening is controlled by a single valve stem, and the valve opening is relatively fixed. When precise control of liquid flow is required, an additional solenoid valve is usually required, which will undoubtedly increase the occupied area and cost of the equipment. In addition, the valve opening adjustment is affected by two solenoid valves, making it difficult to adjust. Summary of the invention

[0003] In order to overcome the above-mentioned disadvantages, the object of the present invention is to provide a solenoid valve with segmented control, which can adjust the opening change of the valve to help improve the control accuracy of the liquid flow.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is: a segmented controlled solenoid valve, comprising A valve seat, wherein a valve cavity and a fluid channel are connected to each other; An opening and closing member, the opening and closing member is located in the valve cavity and can move up and down to open and close the port of the fluid channel; a transmission member, the transmission member is connected to the opening and closing member and can move under the action of the electromagnetic drive assembly; the transmission member includes a first valve stem and a second valve stem used in conjunction with each other, the first valve stem is connected to the opening and closing member through an elastic member, the second valve stem is slidably arranged on the first valve stem, and the second valve stem is provided with a push arm that can push against the opening and closing member; A stopper, the stopper comprising an upper stopper and a lower stopper for limiting the movement range of the second valve stem; When the first valve stem is in the highest position, the elastic member is in a stretched state, and the push arm of the second valve stem abuts against the opening and closing member; when the first valve stem moves downward, the second valve stem can move downward synchronously and push the opening and closing member downward until the second valve stem stops on the lower stopper; when the first valve stem continues to move downward, the elastic member returns to a natural state and drives the opening and closing member to continue to move downward.

[0005] Assuming that in the initial state, the first valve stem is at the highest position of movement, the second valve stem and the opening and closing member are also at the highest position of movement, at this time, the opening of the opening and closing member to the fluid channel port is the largest; the whole process of the electromagnetic drive component driving the transmission member to move downward is as follows: Phase 1: The electromagnetic drive assembly drives the first valve stem to move downward, and the second valve stem moves downward synchronously with the first valve stem under the action of its own weight, and the push arm then pushes the opening and closing member downward to reduce the opening of the fluid channel port until the second valve stem stops on the lower stopper; in this process, the elastic member is always in a stretched state and does not generate a downward force on the opening and closing member, so the downward movement of the opening and closing member relies on the downward thrust exerted by the second valve stem; The second stage: the electromagnetic drive assembly continues to drive the first valve stem to move downward. At this time, the second valve stem no longer moves downward due to the limit of the lower stopper; the first valve stem can move downward along the second valve stem, and the elastic member gradually returns to its natural state. During this process, the opening and closing member remains stationary and the opening of the fluid channel port remains unchanged; The third stage: the electromagnetic drive component continues to drive the first valve stem to move downward, the first valve stem continues to move downward along the second valve stem, the elastic member is subjected to force and drives the opening and closing member to move downward, and the opening of the fluid channel port is further reduced until the opening and closing member abuts against the port of the fluid channel and closes the port of the fluid channel; in this process, the elastic member is in a natural state and can transmit the downward thrust of the first valve stem to the opening and closing member, that is, the downward movement of the opening and closing member relies on the downward thrust exerted by the first valve stem.

[0006] The beneficial effects of the segmented controlled solenoid valve of the present invention are: In the transmission part, the movement process of the opening and closing part can be controlled in sections through the cooperation of the first valve stem, the second valve stem and the elastic part, thereby realizing the section-by-section control of the opening of the fluid channel port; the relative sliding of the second valve stem and the first valve stem makes it possible for the first valve stem or the second valve stem to drive the opening and closing part independently; and the setting of the stopper can limit the movement range of the second valve stem, thereby facilitating the identification of the position nodes of the opening and closing part at different stages and controlling the different opening positions of the fluid channel.

[0007] In addition, the forces on the opening and closing parts are different in different stages, and thus the electromagnetic driving forces required for the opening and closing parts in different stages are also different. By using different electromagnetic driving forces to drive the opening and closing parts to move, segmented control of the opening of the opening and closing parts can be achieved, and different openings can produce different flow rates, which in turn helps to improve the control accuracy of the fluid flow rate.

[0008] Furthermore, when the second valve stem abuts against the lower stopper, the elastic member is still in a stretched state. Since the elastic member is in a stretched state, the elastic member can only exert an upward pulling force on the opening and closing member, and the second valve stem needs to overcome the pulling force of the elastic member before driving the opening and closing member to move downward.

[0009] Furthermore, the first valve stem includes a rod body, one end of which is connected to the electromagnetic drive assembly, and the other end is connected to the opening and closing member through the elastic member; a protrusion that can slide along the second valve stem is provided on the side wall of the rod body. The electromagnetic drive assembly drives the rod body to move up and down, and then applies force to the opening and closing member through the elastic member. The setting of the protrusion realizes the relative sliding of the first valve stem and the second valve stem.

[0010] Furthermore, the lower end of the rod body is provided with a rod body receiving groove for receiving the elastic member. The elastic member can be guided by the arrangement of the rod body receiving groove.

[0011] Furthermore, the second valve stem comprises a sleeve rod sleeved on the rod body, and a slide groove for the protrusion to slide is defined in the sleeve rod.

[0012] Furthermore, the upper end of the sleeve rod is provided with a stop arm that can abut against the protrusion, and the lower end is provided with the push arm; when the first valve stem is in the highest position, one end of the stop arm abuts against the upper stop block, and the other end abuts against the protrusion. The highest position of the second valve stem can be limited by the cooperation of the stop arm and the stop block, and at the same time, the highest position of the first valve stem can be limited by the abutment of the stop arm and the protrusion. When the first valve stem moves downward, the protrusion moves downward accordingly, and a gap appears between the protrusion and the stop arm. At this time, the second valve stem is in a suspended state, so the second valve stem can move downward under the action of its own weight so that the stop arm always abuts against the protrusion.

[0013] Furthermore, the opening and closing member includes a valve plug body, both ends of which are pressed into the valve seat through a diaphragm; the upper end of the valve plug body is provided with a first end face and a second end face, the first end face is connected to the elastic member, and the second end face is abutted by the push arm. The arrangement of the first end face and the second end face enables the elastic member and the second valve stem to act on different positions of the opening and closing member, so as to facilitate the elastic member and the second valve stem to independently apply force to the opening and closing member.

[0014] Furthermore, the first end surface is higher than the second end surface.

[0015] Furthermore, the stop member includes a stop seat clamped between the electromagnetic drive assembly and the valve seat, the middle part of the stop seat is provided with a cavity that passes through from top to bottom, the transmission member is located in the cavity, and the upper stop block and the lower stop block are respectively located at the upper and lower ends of the cavity.

[0016] Further, the electromagnetic drive assembly includes an electromagnetic coil, a fixed iron core, a movable iron core, and a second spring. The electromagnetic coil is wound around the outside of the fixed iron core. The movable iron core is located below the fixed iron core and its lower end is connected to the transmission member. The second spring is located between the fixed iron core and the movable iron core. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of an embodiment of the present invention when the first valve stem is in the highest position; Figure 2 for Figure 1 A partial enlarged view of the A part; Figure 3 It is a schematic diagram of the structure of a transmission member according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure in which the second valve stem abuts against the lower stopper in an embodiment of the present invention; Figure 5 It is a schematic structural diagram of an embodiment of the present invention when the first valve stem is in the lowest position.

[0018] In the figure: 1-valve seat; 11-valve chamber; 12-fluid channel; 2-opening and closing member; 21-valve plug body; 211-plunger; 22-diaphragm; 221-diaphragm protrusion; 3-electromagnetic drive assembly; 31-electromagnetic coil; 32-fixed iron core; 33-movable iron core; 34-second spring; 35-cover; 41-first valve stem; 411-rod body; 412-bump; 42-second valve stem; 421-pushing arm; 422-sleeve rod; 423-stop arm; 43-elastic member; 51-upper stopper; 52-lower stopper; 53-stopper seat; 6-Sealing gasket. DETAILED DESCRIPTION The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0019] Example See attached Figure 1-3As shown, a segmented controlled solenoid valve of the present invention comprises a valve seat 1, an opening and closing member 2, a transmission member, and a stop member, wherein a valve cavity 11 and a fluid channel 12 are connected to each other in the valve seat 1. The opening and closing member 2 is located in the valve cavity 11, and can move up and down to open and close the port of the fluid channel 12. The transmission member is connected to the opening and closing member 2, and can move under the action of the electromagnetic drive assembly 3. The transmission member comprises a first valve stem 41 and a second valve stem 42 used in conjunction with each other, the first valve stem 41 is connected to the opening and closing member 2 through an elastic member 43, the second valve stem 42 is slidably arranged on the first valve stem 41, and the second valve stem 42 is provided with a push arm 421 that can push against the opening and closing member 2. The stop member comprises an upper stopper 51 and a lower stopper 52 for limiting the moving range of the second valve stem 42. When the first valve stem 41 is in the highest position, the elastic member 43 is in a stretched state, and the push arm 421 of the second valve stem 42 abuts against the opening and closing member 2; when the first valve stem 41 moves downward, the second valve stem 42 can move downward synchronously and push the opening and closing member 2 to move downward until the second valve stem 42 stops on the lower stop block 52; when the first valve stem 41 continues to move downward, the elastic member 43 returns to its natural state and drives the opening and closing member 2 to continue to move downward.

[0020] Assuming that in the initial state, the first valve stem 41 is at the highest position of movement, the second valve stem 42 and the opening and closing member 2 are also at the highest position of movement, at this time, the opening of the opening and closing member 2 to the port of the fluid channel 12 is the largest. The whole process of the electromagnetic drive component 3 driving the transmission member to move downward is as follows: Phase 1: See attached Figure 2 As shown; the electromagnetic drive assembly 3 drives the first valve stem 41 to move downward, and the second valve stem 42 moves downward synchronously with the first valve stem 41 under the action of its own weight, and the push arm 421 then pushes the opening and closing member 2 downward to reduce the opening of the port of the fluid channel 12 until the second valve stem 42 stops on the lower stopper 52; in this process, the elastic member 43 is always in a stretched state and does not generate a downward force on the opening and closing member 2, so the downward movement of the opening and closing member 2 relies on the downward thrust exerted by the second valve stem 42; Phase II: See attached Figure 4 As shown, the electromagnetic drive assembly 3 continues to drive the first valve stem 41 to move downward. At this time, the second valve stem 42 no longer moves downward due to the limit of the lower stopper 52; the first valve stem 41 can move downward along the second valve stem 42, and the elastic member 43 gradually returns to a natural state. In this process, the opening and closing member 2 remains stationary and maintains the opening of the port of the fluid channel 12 unchanged; Phase 3: See attached Figure 5As shown, the electromagnetic drive assembly 3 continues to drive the first valve stem 41 to move downward, and the first valve stem 41 continues to move downward along the second valve stem 42. The elastic member 43 is stressed and drives the opening and closing member 2 to move downward, and the opening of the port of the fluid channel 12 is further reduced until the opening and closing member 2 abuts against the port of the fluid channel 12 and closes the port of the fluid channel 12; in this process, the elastic member 43 is in a natural state and can transmit the downward thrust of the first valve stem 41 to the opening and closing member 2, that is, the downward movement of the opening and closing member 2 relies on the downward thrust applied by the first valve stem 41.

[0021] When the first valve stem 41 is at the lowest position of movement, the second valve stem 42 and the opening and closing member 2 are both at the lowest position of movement. At this time, the opening and closing member 2 closes the port of the fluid channel 12. The whole process of the electromagnetic drive component 3 driving the transmission member to move upward is as follows: The first stage: the electromagnetic drive assembly 3 drives the first valve stem 41 to move upward, the elastic member 43 is subjected to force and drives the opening and closing member 2 to move upward, and the opening of the port of the fluid channel 12 gradually increases until the opening and closing member 2 abuts against the second valve stem 42; in this process, the elastic member 43 is in a natural state, and the opening and closing member 2 is only subjected to the upward force exerted by the elastic member 43; The second stage: the electromagnetic drive component 3 drives the first valve stem 41 to continue to move upward, the elastic member 43 is subjected to force and drives the opening and closing member 2 to continue to move upward, and the opening of the port of the fluid channel 12 is further increased. Since the opening and closing member 2 abuts against the second valve stem 42, at this time, the opening and closing member 2 can drive the second valve stem 42 to move upward synchronously until the second valve stem 42 abuts against the upper stopper 51; in this process, the elastic member 43 is in a natural state or a stretched state, and the opening and closing member 2 is simultaneously subjected to the upward force exerted by the elastic member 43 and the downward force exerted by the second valve stem 42, therefore, the force exerted by the elastic member 43 on the opening and closing member 2 needs to be greater than the gravity of the second valve stem 42; The third stage: the electromagnetic drive component 3 drives the first valve stem 41 to continue to move upward. Since the second valve stem 42 is limited and abutted against the upper stop block 51, and the opening and closing member 2 is limited and abutted against the second valve stem 42, the opening and closing member 2 can remain stationary and the elastic member 43 is gradually stretched. In this process, the opening of the port of the fluid channel 12 remains unchanged.

[0022] In this embodiment, the movement process of the opening and closing member 2 can be controlled in sections through the cooperation of the first valve stem 41, the second valve stem 42, and the elastic member 43, thereby realizing the section-by-section control of the opening of the fluid channel 12; the relative sliding of the second valve stem 42 and the first valve stem 41 makes it possible for the first valve stem 41 or the second valve stem 42 to drive the opening and closing member 2 alone; and the setting of the stop member can limit the movement range of the second valve stem 42, thereby facilitating the identification of the position nodes of the opening and closing member 2 at different stages and controlling the different opening positions of the fluid channel 12.

[0023] When the opening and closing member moves downward, the forces on the opening and closing member 2 are different (the first stage: the opening and closing member 2 is subjected to the upward pulling force of the elastic member 43 and the downward pressure of the second valve stem 42, at this time, the downward pressure of the second valve stem 42 is greater than the upward pulling force of the elastic member 43; the third stage: the opening and closing member 2 is subjected to the downward pressure of the elastic member 43); when the opening and closing member 2 moves upward, the forces on the opening and closing member 2 are also different (the first stage: the opening and closing member 2 is subjected to the upward pulling force of the elastic member 43; the second stage: the opening and closing member 2 is subjected to the upward pulling force of the elastic member 43 and the downward pressure of the second valve stem 42, at this time, the upward pulling force of the elastic member 43 is greater than the downward pressure of the second valve stem 42). Since the opening and closing member 2 needs to overcome different forces to move at different stages, its requirements for the electromagnetic driving force applied by the electromagnetic driving component 3 are also different. By using different electromagnetic driving forces to drive the opening and closing member 2 to move, the segmented control of the opening of the opening and closing member 2 can be realized, and different openings can produce different flow rates, which is conducive to improving the control accuracy of the fluid flow rate.

[0024] In addition, the electromagnetic drive assembly 3 is used to drive the second valve stem 42 to move to different height positions, which can reduce the difficulty and cost of the customer's control of the electrical signal to a certain extent.

[0025] Furthermore, when the first valve stem 41 is at the lowest position, the opening and closing member 2 blocks the port of the fluid channel 12 , and the elastic member 43 is in a compressed state, so that the opening and closing member 2 has a better blocking effect on the port of the fluid channel 12 .

[0026] In some embodiments, when the second valve stem 42 abuts against the lower stopper 52, the elastic member 43 is still in a stretched state. Since the elastic member 43 is in a stretched state, the elastic member 43 can only exert an upward pulling force on the opening and closing member 2, and the second valve stem 42 needs to overcome the pulling force of the elastic member 43 before driving the opening and closing member 2 to move downward. Therefore, in the first stage of downward movement, the downward movement of the opening and closing member 2 is driven by the second valve stem 42.

[0027] In some embodiments, see Appendix Figure 3 As shown, the first valve stem 41 includes a rod body 411, one end of the rod body 411 is connected to the electromagnetic drive assembly 3, and the other end is connected to the opening and closing member 2 through an elastic member 43. A protrusion 412 that can slide along the second valve stem 42 is provided on the side wall of the rod body 411. The second valve stem 42 includes a sleeve rod 422 sleeved on the rod body 411, and a slide groove for the protrusion 412 to slide is defined in the sleeve rod 422. A stop arm 423 for stopping the protrusion 412 is integrally provided at the upper end of the sleeve rod 422, and a push arm 421 is provided at the lower end. The stop arm 423 and the push arm 421 are both arranged in the horizontal direction, and a notch is provided on the stop arm 423 for the rod body 411 to pass through. A notch is provided on the push arm 421 for the opening and closing member 2 to pass through. When the first valve stem 41 is at the highest position, one end of the stop arm 423 abuts against the upper stop block 51 , and the other end abuts against the protrusion 412 .

[0028] The second valve stem 42 can limit the highest position of the second valve stem 42 through the cooperation of the stop arm 423 and the upper stop block 51. At the same time, the highest position of the first valve stem 41 can be limited by the contact between the stop arm 423 and the protrusion 412. When the first valve stem 41 moves downward, the protrusion 412 moves downward accordingly, and a gap appears between the protrusion 412 and the stop arm 423. At this time, the second valve stem 42 is in a suspended state, so the second valve stem 42 can move downward under the action of its own weight, so that the stop arm 423 always abuts against the protrusion 412. When the push arm 421 abuts against the lower stop block 52, as the rod body 411 continues to move downward, the protrusion 412 can move downward along the slide groove. At this time, a gap is formed between the protrusion 412 and the stop arm 423. The electromagnetic drive component 3 drives the rod body 411 to move up and down, and then applies force to the opening and closing member 2 through the elastic member 43. The arrangement of the projection 412 enables the relative sliding of the first valve stem 41 and the second valve stem 42. The cooperation of the stop arm 423, the upper stopper 51 and the projection 412 can limit the highest position of the movement of the first valve stem 41 and the second valve stem 42.

[0029] In some embodiments, the elastic member 43 includes a first spring arranged vertically, and the two ends of the first spring are respectively connected to the rod body 411 and the opening and closing member 2. Furthermore, a rod body receiving groove for receiving the first spring is provided at the lower end of the rod body 411. The first spring can be guided by the provision of the rod body receiving groove.

[0030] In some embodiments, the opening and closing member 2 includes a valve plug body 21, and both ends of the valve plug body 21 are pressed into the valve seat 1 through a diaphragm 22. The upper end of the valve plug body 21 is provided with a first end face and a second end face, the first end face is connected to the first spring, and the second end face is abutted by the push arm 421. The arrangement of the first end face and the second end face enables the elastic member 43 and the second valve stem 42 to act on different positions of the opening and closing member 2, so as to facilitate the elastic member 43 and the second valve stem 42 to independently apply force to the opening and closing member 2.

[0031] Furthermore, the valve plug body 21 includes an upper plug body and a lower plug body which are coaxially arranged, and the radial dimension of the upper plug body is smaller than the radial dimension of the lower plug body. The upper end surface of the upper plug body forms a first end surface, and the upper end surface of the lower plug body forms a second end surface. Since the upper plug body is located at the upper end of the lower plug body, the first end surface is higher than the second end surface.

[0032] A plunger 211 having a truncated cone structure is integrally provided at the lower end of the lower plug body. The plunger 211 can be inserted into the fluid channel 12 to block the fluid channel.

[0033] In some embodiments, one end of the diaphragm 22 is connected to the lower plug body, and the other end is provided with a diaphragm protrusion 221. The valve seat 1 is provided with an embedding groove for accommodating the diaphragm protrusion 221.

[0034] In some embodiments, see Appendix Figure 4-5 As shown, the stopper includes a stopper seat 53 sandwiched between the electromagnetic drive assembly 3 and the valve seat 1, a cavity extending vertically is provided in the middle of the stopper seat 53, the transmission member is located in the cavity, and the upper stopper 51 and the lower stopper 52 are respectively located at the upper and lower ends of the cavity. Furthermore, a sealing gasket 6 is provided between the stopper seat 53 and the electromagnetic drive assembly 3.

[0035] In some embodiments, see Appendix Figure 4 As shown, the electromagnetic drive assembly 3 includes an electromagnetic coil 31, a fixed iron core 32, a movable iron core 33, and a second spring 34. The electromagnetic coil 31 is wound around the outer side of the fixed iron core 32. The movable iron core 33 is located below the fixed iron core 32, and its lower end is connected to the transmission member. The second spring 34 is located between the fixed iron core 32 and the movable iron core 33.

[0036] When the electromagnetic coil 31 is energized, the movable iron core 33 can overcome the force of the second spring 34 and move in the direction of the fixed iron core 32. At this time, the transmission part can move up accordingly and drive the opening and closing part 2 to move up; when the electromagnetic coil 31 is de-energized, the movable iron core 33 moves in the direction away from the fixed iron core 32 under the action of the rebound force of the second spring 34 and its own weight, and the transmission part moves down immediately, driving the opening and closing part 2 to move down.

[0037] Furthermore, the electromagnetic drive assembly 3 further includes a cover shell 35 which is arranged on the outside of the electromagnetic coil 31 , and the cover shell 35 is fixedly connected to the stop seat 53 .

[0038] Furthermore, the upper end of the movable core 33 is provided with a core receiving groove, and the second spring 34 is arranged vertically in the core receiving groove, and its upper end abuts against the fixed core 32. When the movable core 33 is at the lowest position of movement, the second spring 34 is in a pre-tightened and compressed state.

[0039] The specific working process of this embodiment is as follows: In the initial state, the first valve stem 41 is at the highest position of movement, the first spring is in a stretched state, and the second spring 34 is in a compressed state; After the electromagnetic coil 31 loses power, the movable iron core 33 moves downward under the action of its own weight and the second spring 34, and the first valve stem 41 moves downward immediately; due to the gap formed between the protrusion 412 and the stop arm 423, the second valve stem 42 can move downward under the action of its own weight and push the valve plug body 21 to move downward; when the second valve stem 42 abuts against the lower stop block 52, the second valve stem 42 stops moving; the first valve stem 41 continues to move downward under the drive of the movable iron core 33, and the first spring gradually returns to its natural state; as the first valve stem 41 continues to move downward, the first spring can drive the valve plug body 21 to continue to move downward, at this time, the second valve stem 42 no longer abuts against the valve plug body 21; when the valve plug body 21 blocks the port of the fluid channel, the first valve stem 41 continues to move downward to the lowest position under the action of the movable iron core 33, at this time, the first spring and the second spring 34 are both in a compressed state.

[0040] After the electromagnetic coil 31 is energized, the movable iron core 33 moves upward under the action of the electromagnetic force, and drives the first valve stem 41 upward, and the first spring gradually returns to its natural state; as the first valve stem 41 continues to move upward, the first spring can drive the valve plug body 21 upward until the valve plug body 21 abuts against the push arm 421 of the second valve stem 42; when the first valve stem 41 continues to move upward, the first spring is gradually stretched until the valve plug body 21 can drive the second valve stem 42 to move upward synchronously, until the second valve stem 42 abuts against the upper stopper 51; when the first valve stem 41 continues to move upward, the valve plug body 21 remains stationary under the action of the second valve stem 42, and the first spring is further stretched.

[0041] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A solenoid valve with segmented control, characterized in that: include A valve seat, wherein a valve cavity and a fluid channel are connected to each other; An opening and closing member, the opening and closing member is located in the valve cavity and can move up and down to open and close the port of the fluid channel; a transmission member, the transmission member is connected to the opening and closing member and can move under the action of the electromagnetic drive assembly; the transmission member includes a first valve stem and a second valve stem used in conjunction with each other, the first valve stem is connected to the opening and closing member through an elastic member, the second valve stem is slidably arranged on the first valve stem, and the second valve stem is provided with a push arm that can push against the opening and closing member; A stopper, the stopper comprising an upper stopper and a lower stopper for limiting the movement range of the second valve stem; When the first valve stem is in the highest position, the elastic member is in a stretched state, and the push arm of the second valve stem abuts against the opening and closing member; when the first valve stem moves downward, the second valve stem can move downward synchronously and push the opening and closing member downward until the second valve stem stops on the lower stopper; when the first valve stem continues to move downward, the elastic member returns to a natural state and drives the opening and closing member to continue to move downward.

2. The segment-controlled solenoid valve according to claim 1, characterized in that: When the second valve stem abuts against the lower stopper, the elastic member is still in a stretched state.

3. The segment-controlled solenoid valve according to claim 1, characterized in that: The first valve stem comprises a rod body, one end of which is connected to the electromagnetic drive assembly, and the other end of which is connected to the opening and closing member via the elastic member; a protrusion which can slide along the second valve stem is provided on the side wall of the rod body.

4. The segment-controlled solenoid valve according to claim 3 is characterized in that: The lower end of the rod body is provided with a rod body receiving groove for receiving the elastic member.

5. The segment-controlled solenoid valve according to claim 3, characterized in that: The second valve stem comprises a sleeve rod sleeved on the rod body, wherein a slide groove for the protrusion to slide is defined in the sleeve rod.

6. The segment-controlled solenoid valve according to claim 5, characterized in that: The upper end of the sleeve rod is provided with a stop arm that can abut against the protrusion, and the lower end is provided with the push arm; when the first valve stem is in the highest position, one end of the stop arm abuts against the upper stop block, and the other end abuts against the protrusion.

7. The segment-controlled solenoid valve according to claim 1, characterized in that: The opening and closing member includes a valve plug body, both ends of which are pressed into the valve seat through a diaphragm; the upper end of the valve plug body is provided with a first end face and a second end face, the first end face is connected to the elastic member, and the second end face is abutted by the push arm.

8. The segment-controlled solenoid valve according to claim 7, characterized in that: The first end surface is higher than the second end surface.

9. The segment-controlled solenoid valve according to claim 1, characterized in that: The stopper comprises a stopper seat sandwiched between the electromagnetic drive assembly and the valve seat, a cavity penetrating from top to bottom is provided in the middle of the stopper seat, the transmission member is located in the cavity, and the upper stopper and the lower stopper are respectively located at the upper and lower ends of the cavity.

10. The segment-controlled solenoid valve according to claim 1, characterized in that: The electromagnetic drive assembly includes an electromagnetic coil, a fixed iron core, a movable iron core, and a second spring. The electromagnetic coil is wound around the outer side of the fixed iron core. The movable iron core is located below the fixed iron core and its lower end is connected to the transmission member. The second spring is located between the fixed iron core and the movable iron core.

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