Top-in, bottom-out vertical solenoid valve

Abstract

The present invention relates to a vertical solenoid valve with top inlet and bottom outlet, comprising a valve body and an electromagnetic head installed above the valve body. The inlet pipe provided on the valve body extends horizontally outward from the side wall of the inlet side of the main body of the valve body, then bends upward, with the pipe mouth facing upward. The outlet pipe is led downward from the bottom of the main body of the valve body, extends along the horizontal extension direction of the inlet pipe, then bends downward, with the pipe mouth facing downward. The valve body can adopt a pilot valve structure, and the electromagnetic head can be provided with two static iron cores and one moving iron core. The first static iron core is sleeved on the outer side of the upper part of the magnetic isolation tube, and its lower end is lower than the lower end of the second static iron core. The present invention is suitable for a vertical installation method with top inlet and bottom outlet. The electromagnetic head has a large starting driving force, and the driving force required when the valve body is opened is small. It can be used for large-diameter and ultra-high-pressure pipelines with top inlet and bottom outlet and other suitable occasions.

Description

Technical Field

[0001] The invention relates to a top-in, bottom-out vertical electromagnetic valve. Background Art

[0002] Existing solenoid valves, especially large-caliber / high-power pilot solenoid valves, mostly adopt a horizontal installation structure, in which the center axis of the inlet interface (or interface pipe) and the outlet interface of the valve body is a horizontal line. For example, Chinese patent document CN105650329A discloses an ultra-high-pressure large-caliber solenoid valve, including a valve body and an electromagnetic head used as a drive device. The valve body includes a main valve body, a main valve cover, a middle cover and an upper cover. The main valve body and the main valve cover form a main valve cavity, wherein a vertical main valve disc guide sleeve is fixedly installed in the main valve cavity, and the main valve disc is movably connected to the inside of the main valve disc guide sleeve. A main valve seat is provided between the main valve cavity and the main valve lower cavity, and the lower part of the main valve disc is provided with a The main valve has a damping through-hole, and the middle cover and main valve cover form a middle valve cavity. A middle valve seat is located between the middle valve cavity and the middle valve upper cavity. Below the middle valve seat is a middle valve disc. The upper cover and main valve cover form an auxiliary valve cavity. A secondary valve seat is located between the auxiliary valve cavity and the auxiliary valve outlet cavity. Above the auxiliary valve disc is an auxiliary valve disc. A solenoid head is mounted above the valve body and includes a movable moving iron core, a static iron core, a magnetic isolation tube, and a coil. The magnetic isolation tube has a tube hole. Both the static iron core and the moving iron core are located within the tube hole of the magnetic isolation tube. The coil is located outside the magnetic isolation tube. The static iron core is fixedly mounted above the tube hole of the magnetic isolation tube. The moving iron core is located below the static iron core and is clearance-matched with the inner wall of the tube hole of the magnetic isolation tube. This solenoid valve has good sealing performance, is easy to process and assemble, requires a small driving force, and is particularly suitable for applications requiring ultra-high pressure and large diameter.

[0003] However, due to the limitations of its internal structure and corresponding working mechanism, this solenoid valve can only be installed horizontally. If this solenoid valve is installed on a vertical pipe, it will not work properly regardless of whether the inlet side is facing up or down.

[0004] In addition, although the above-mentioned solenoid valve has reduced the driving force requirement at startup to a large extent by setting a pilot valve structure, however, since the distance between the static and dynamic iron cores (usually called the working air gap) of the solenoid head is the largest and the driving force is the smallest when the solenoid head is powered on and started, and the power demand of the valve body at this time is affected by various factors such as static friction and sealing force requirements, the power demand at startup is the largest. This requires that the power output of the solenoid head when the power output is the smallest can meet the power demand of the valve when the power demand is the largest, thereby significantly increasing the volume and material cost of the solenoid head and causing unnecessary energy consumption. Summary of the Invention

[0005] The object of the present invention is to provide a vertical solenoid valve with an inlet facing upward and an outlet facing downward, so as to be suitable for installation and use on corresponding vertical pipelines.

[0006] A further object of the present invention is to increase the driving force of the electromagnetic head when starting, so as to reduce the configuration of the electromagnetic head.

[0007] The technical solution of the present invention is: a top-inlet and bottom-out vertical solenoid valve, comprising a valve body and an electromagnetic head installed above the valve body, the valve body being provided with an upwardly bent inlet pipe and a downwardly bent outlet pipe, the pipe opening of the inlet pipe facing upward, and the pipe opening of the outlet pipe facing downward.

[0008] Preferably, the electromagnetic head installed above the valve body is vertical, and the movement mode of the moving iron core is vertical linear movement.

[0009] Preferably, the lower end of the moving iron core extends into the valve body of the valve body, is connected to an opening and closing member that requires external force to drive, and drives the connected opening and closing member to move up and down.

[0010] Preferably, the orifice of the inlet pipe is located directly above the orifice of the outlet pipe.

[0011] Preferably, the orifice of the inlet pipe is located directly above the orifice of the outlet pipe, and the inlet pipe is bent in such a manner that it extends horizontally outward from the side of the main body of the valve body, and then bends upward so that the orifice faces upward; the outlet pipe is bent in such a manner that it extends along the horizontal extension direction of the inlet pipe from the bottom of the main body of the valve body, and then bends downward so that the orifice faces downward; the central axis at the orifice of the inlet pipe and the central axis at the orifice of the outlet pipe are both vertical and located on the same straight line, so as to better adapt to installation on a vertical straight pipeline.

[0012] Preferably, the valve body adopts a pilot valve structure, and is provided with a main sealing pair and a secondary sealing pair. The secondary sealing pair is located above the main sealing pair, and the secondary valve flap in the negative sealing pair is located above the secondary valve seat. The lower end of the moving iron core extends into the valve body and is connected to the secondary valve flap, which can drive the secondary valve flap to move up and down.

[0013] Preferably, the electromagnetic head is provided with an electromagnetic head shell and a coil, a moving iron core, a static iron core and a magnetic isolation tube arranged vertically coaxially with the electromagnetic head shell. The coil, the moving iron core and the static iron core are installed in the electromagnetic head shell. The coil is wrapped around the outside of the magnetic isolation tube and is fixedly installed on the coil frame. The magnetic isolation tube passes through the magnetic isolation tube through-hole on the bottom plate of the electromagnetic head shell. Its top end is fixedly connected to the top plate of the electromagnetic head shell, and its bottom end is located outside the electromagnetic head shell. The static iron core includes a first static iron core and a second static iron core. The main body of the first static iron core is tubular and is sleeved on the outside of the upper part of the magnetic isolation tube. It is located between the coil and the magnetic isolation tube, and its lower end is lower than the lower end of the second static iron core. The second static iron core and the moving iron core are arranged in the magnetic isolation tube. The second static iron core is fixedly installed in the upper part of the magnetic isolation tube. The moving iron core is located below the second static iron core and slides with the inner wall of the magnetic isolation tube. Under normal conditions, a first working air gap is left between its top surface and the lower end of the first static iron core.

[0014] Preferably, a circular disk-shaped structure is provided on the top of the first static iron core, and the top disk-shaped structure of the first static iron core extends radially outward from the top of the main body of the first static iron core, and its upper surface is in contact with the inner surface of the top plate of the electromagnetic head housing.

[0015] Preferably, a magnetic conductive sleeve is provided in the electromagnetic head housing, and the magnetic conductive sleeve is located at the connection position between the bottom plate of the electromagnetic head housing and the magnetic isolation tube. The main part of the magnetic conductive sleeve is in the shape of a sleeve and is sleeved on the magnetic isolation tube. The top height is lower than the top surface height of the moving iron core under normal conditions, and a circular disk-shaped structure is provided at the bottom. The bottom disk-shaped structure of the magnetic conductive sleeve extends radially outward from the bottom end of the main part of the magnetic conductive sleeve, and its lower surface is in contact with the inner surface of the bottom plate of the electromagnetic head housing.

[0016] Preferably, the electromagnetic head housing is composed of a main electromagnetic head housing with an open bottom and an electromagnetic head housing cover covering the open bottom of the main electromagnetic head housing.

[0017] Preferably, a vertical screw is provided on the top of the second static iron core, and the vertical screw passes through the screw hole in the center of the top plate of the electromagnetic head housing. A fastening nut is screwed on the outer side of the vertical screw, and the vertical screw is fastened to the electromagnetic head housing through the fastening nut.

[0018] Preferably, a junction box is installed on the side wall of the electromagnetic head housing, and a connection terminal for connecting an external power cable is provided in the junction box. The connection terminal is connected to the coil via a wire passing through the side wall of the electromagnetic head housing.

[0019] Preferably, the vertical dimension of the first working air gap is 2-3 mm under normal conditions.

[0020] Preferably, by setting the cross-section of the first static iron core, the cross-section of the second static iron core and the vertical dimensions of the first working air gap and the second working air gap under normal conditions, the suction force between the moving iron core and the static iron core during startup is 1.5-2.5 times the suction force between the moving iron core and the static iron core when the top surface of the moving iron core and the lower end of the first static iron core are at the same height.

[0021] Preferably, a coil spring disengagement device is provided between the movable iron core and the second static iron core, which tends to push the movable iron core and the second static iron core apart when the movable iron core and the second static iron core are in an engaged state.

[0022] Preferably, the coil spring disengagement device includes a coil spring and a disengagement pin, the moving iron core is provided with a spring mounting hole located on its axis, the disengagement pin is in the shape of a cylindrical step that is thin at the top and thick at the bottom, the top of the spring mounting hole is in the shape of a necking corresponding to the disengagement pin, the inner diameter of the necking is slightly larger than the outer diameter of the upper part of the disengagement pin and smaller than the outer diameter of the lower part of the disengagement pin, the coil spring is located in the spring mounting hole and is in a pre-compressed state, its top is pressed against the bottom of the disengagement pin, and its bottom is pressed against the bottom of the spring mounting hole.

[0023] The beneficial effects of the present invention are as follows: due to the provision of inlet and outlet pipes with corresponding bends and pipe mouth orientations, the interface originally adapted for connection with horizontal pipes is converted into an interface adapted for connection with vertical pipes, and without changing the internal structure and working mechanism, the inlet is directed upward and the outlet is directed downward, allowing the medium to flow from top to bottom, and is adapted for installation and use on vertical pipes with corresponding flow directions, thereby ensuring the normal operation of the valve; since the inlet and outlet pipes can be cast and processed together with other parts of the valve body as part of the valve body, there is no need to increase excessive costs. Compared with the horizontal connection method of adapting to the valve by changing the direction of the pipeline on site, the structure is simple, the cost is low, the construction is convenient, and it is not prone to failure, and basically does not increase resistance; since the electromagnetic head is provided with a first static iron core and a second static iron core, and the first working air gap between the first static iron core and the moving iron core is significantly smaller than the second working air gap between the second static iron core and the moving iron core when starting, the suction force between the first static iron core and the moving iron core will be significantly greater than the suction force of the second static iron core (equivalent to the static iron core of the existing electromagnetic head), thereby obviously The power at startup is increased, and thus, compared with the existing electromagnetic head, a smaller electromagnetic head can drive a larger load. At the same time, when the moving iron core and the second static iron core are attracted, the force between the first static iron core and the moving iron core is very small and can basically be ignored. From the entire upward movement process of the moving iron core, the amplitude of the power change is also significantly reduced, which is beneficial to reducing the impact force when the moving iron core and the second static iron core are attracted, extending the service life, and also beneficial to reducing unnecessary power consumption; since the first static iron core is tubularly sleeved on the outside of the second static iron core, the power generated by the first static iron core (the suction force between it and the moving iron core) and the power generated by the second static iron core are evenly distributed in the circumferential direction, and the effects are consistent, both vertically upward, and the circumferential balance of the magnetic field is not destroyed due to the setting of the two static iron cores, and the cross-sectional size ratio of the two static iron cores can be appropriately selected according to the magnetic field characteristics, the magnetic flux of the two static iron cores can be reasonably distributed according to actual needs, and the working air gap of the first static iron core at startup can be reasonably set, thereby optimizing the power change curve of the electromagnetic head during the entire attraction process and further improving the power characteristics. By improving the static iron core, while other parts remain basically unchanged, it is possible to obtain greater starting power / maximum power output, reduce the variation range of power output during the action, improve the effective utilization rate of power, meet higher load driving requirements, help reduce the size of the electromagnetic head, reduce manufacturing costs, reduce space occupancy, reduce unnecessary energy waste, and improve energy efficiency.

[0024] It should be noted that since the valve body of a solenoid valve is typically one-way, it is not permitted to connect this valve to a vertical pipe where the medium flows from bottom to top. Furthermore, for the same reason that existing horizontal solenoid valves cannot be installed vertically, this type of solenoid valve is also not suitable for direct installation on horizontal pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structure of the solenoid valve of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure involving the valve body;

[0027] Figure 3 This is a schematic diagram of the structure of the electromagnetic head part (at startup);

[0028] Figure 4 It is a schematic diagram of the partial structure involving the electromagnetic head part (the top surface of the moving iron core is in an upward state beyond the lower end of the first static iron core). DETAILED DESCRIPTION

[0029] See also Figures 1-4 The solenoid valve of the present invention includes a valve body 10 and an electromagnetic head (or electromagnetic drive head) 60 installed above the valve body. The valve body is provided with an upwardly bent inlet pipe 11 and a downwardly bent outlet pipe 18. The pipe opening of the inlet pipe faces upward, and the pipe opening of the outlet pipe faces downward.

[0030] The pipe opening of the inlet pipe can usually be located directly above the pipe opening of the outlet pipe, and can also be set at other positions according to actual needs.

[0031] For example, the bending manner (shape) of the inlet pipe can be to extend horizontally outward from the inlet side wall of the main part of the valve body (the part where the sealing pair is provided, or in other words, the part other than the inlet pipe and the outlet pipe), and then bend upward so that the pipe mouth faces upward and the central axis at the pipe mouth is vertical. The bending manner (shape) of the outlet pipe can be to be led out downward from the bottom of the main part of the valve body, extend along the horizontal extension direction of the inlet pipe, and then bend downward so that the pipe mouth faces downward and the central axis at the pipe mouth is vertical. The central axis at the pipe mouth of the inlet pipe and the central axis at the pipe mouth of the outlet pipe are located on the same vertical straight line to adapt to installation on a vertical straight pipeline.

[0032] The horizontally extending portions of the inlet pipe and the outlet pipe can be connected as one, or in other words, the bottom of the horizontally extending and vertically adjacent inlet pipe and the top of the outlet pipe are integrated, thereby reducing the volume and material consumption and facilitating preparation.

[0033] Connecting ribs 19 may be provided between the vertical portions of the inlet pipe and the outlet pipe to improve integrity and strength.

[0034] Typically, the pipe opening of the inlet pipe and the pipe opening of the outlet pipe are adapted to connect to pipes of the same diameter, and can be directly connected to the same vertical pipeline or connected to the same vertical pipeline using connecting pipes of the same specifications.

[0035] Typically, both the inlet pipe opening and the outlet pipe opening are provided with a flange structure for connecting to an external pipeline.

[0036] The valve seat of the valve body (when a pilot valve structure is adopted, it includes the main valve seat and the auxiliary valve seat) is usually set horizontally, and the valve disc (when a pilot valve structure is adopted, it includes the main valve disc and the auxiliary valve disc) that constitute the same sealing pair with the valve seat is located above its corresponding valve seat, and the opening and closing of the corresponding sealing pair are achieved by moving up and down. The central axis direction of the valve seat through hole (the central through hole on the valve seat, which is the medium channel of the valve seat) is vertical, and the valve seat sealing surface (the sealing surface on the valve seat) is a rotating surface with a vertical rotation axis. Correspondingly, the valve disc sealing surface (the sealing surface on the valve disc) that constitutes the valve seal with the valve seat sealing surface is also a rotating surface with a vertical rotation axis, and the rotation axis of the valve seat sealing surface and the rotation axis of the valve disc sealing surface coincide with each other and are on the same straight line.

[0037] According to the characteristics of the electromagnetic head, the electromagnetic head installed above the valve body should usually be vertical, and the movement of its moving iron core is vertical linear movement. The lower end of the moving iron core extends into the valve body of the valve body, connecting the opening and closing parts that require external force to drive (valve disc, when a pilot valve structure is adopted, it is the auxiliary valve disc), driving the connected opening and closing parts to move up and down.

[0038] When the valve disc is located above the corresponding valve seat, the moving iron core moves upward to open the valve, and moves downward to close the valve.

[0039] The valve body can adopt any solenoid valve body that can be installed horizontally, for example, the valve body disclosed in CN105650329A. The inlet side tubular structure and the outlet side tubular structure of the valve body can be set as the inlet pipe and outlet pipe defined in the present invention on the basis of keeping other parts unchanged.

[0040] To accommodate large-diameter / high-flow and high-pressure (ultra-high-pressure) pipelines, the valve body preferably adopts a pilot valve structure to reduce the driving force required during startup. A valve body employing a pilot valve structure is equipped with a primary sealing pair and a secondary sealing pair (also known as a pilot sealing pair). The secondary sealing pair is positioned above the primary sealing pair, and the secondary valve disc within the secondary sealing pair is positioned above the secondary valve seat. The lower end of the moving iron core is connected to the secondary valve disc (the valve disc of the secondary sealing pair), which can drive the secondary valve disc up and down. The valve body disclosed in CN105650329A employs a pilot valve structure, making it well suited for ultra-high-pressure / large-diameter applications.

[0041] See also Figure 2 The present invention provides a preferred embodiment of a valve body adopting a pilot valve structure, wherein the inlet pipe 11 is connected to the side wall of the main part of the valve body, and the outlet pipe 18 is connected to the bottom of the main part of the valve body. The connection parts are smoothly transitioned. By bending the inlet pipe and the outlet pipe, the pipe mouth of the inlet pipe faces downward and the pipe mouth of the outlet pipe faces upward, so as to adapt to the bottom-in and top-out connection mode.

[0042] A horizontal valve seat (or main valve seat) 16 is provided in the main body of the valve body. The valve seat is located at the bottom of the middle cavity 22 in the valve body. Its vertical central through hole constitutes the only way for the main medium channel. A valve disc (or main valve disc) 15 capable of moving up and down is provided above the valve seat. The valve disc is cup-shaped, with a cylindrical side. A valve disc seal (or main valve disc seal) is provided at the bottom. The valve disc seal is provided with a valve disc sealing surface (or main valve disc sealing surface) corresponding to the valve seat sealing surface (or main valve seat sealing surface); alternatively, according to the structure of the valve sealing pair (or main sealing pair), the valve disc seal may not be provided, and the valve disc sealing surface may be directly provided on the corresponding part of the bottom of the valve disc (for example, the sealing surface material is welded on the corresponding part of the bottom of the valve disc and then machined to form a sealing surface. Usually, the valve seat sealing surface may also be provided. Arranged in this manner), a damping hole 29 is provided at the lower part or bottom of the side wall of the valve disc, which connects the inner cavity 24 and the inlet cavity 21 (which can pass through the middle cavity 22 directly connected to the inlet cavity). A guide sleeve 14 is provided in the main body of the valve body to cooperate with the valve disc guide. The side surface of the valve disc and the inner wall of the guide sleeve are matched in a sliding sealing manner (multiple annular sealing rings can be provided between the two to better achieve sealing under sliding cooperation), that is, the valve disc is allowed to slide up and down and the medium is not allowed to pass between the two (sealed). The outer side surface of the upper part of the guide sleeve is sealed and fixedly connected to the inner wall of the main body of the valve body. A distance is left between the outer side surface of the lower part of the guide sleeve and the inner wall of the main body of the valve body. A distance is also left between the lower end of the guide sleeve and the inner wall (bottom wall) of the main body of the valve body. These distances constitute part of the middle cavity.

[0043] A valve cover 12 is provided on the top of the main part of the valve body, covering the top opening of the main part of the valve body, a guide channel is provided in the valve cover, an auxiliary valve cavity is provided on the guide channel, and an auxiliary valve seat 17 is provided at the bottom of the auxiliary valve cavity. The auxiliary valve seat is arranged horizontally, and its vertical central through hole constitutes the only way for the guide channel. An auxiliary valve flap 44 that can move up and down is provided above the auxiliary valve seat, and the auxiliary valve seat and the auxiliary valve flap are provided with auxiliary valve sealing surfaces that cooperate with each other to realize the sealing of the auxiliary valve. The magnetic isolation tube seat 39 of the electromagnetic head is fixedly installed on the valve cover, covering the top opening of the auxiliary valve cavity, so that the auxiliary valve cavity with an opening on the top of the valve cover forms a closed cavity, and the lower end of the moving iron core 63 of the electromagnetic head is connected to the top of the auxiliary valve flap, which can drive the auxiliary valve flap to move up and down, thereby realizing the opening and closing of the auxiliary valve sealing pair (the valve sealing pair composed of the auxiliary valve seat and the auxiliary valve flap).

[0044] The guide channel on the valve cover is divided into two parts, wherein the inlet of the inlet-side guide channel 23 is arranged on the bottom surface of the valve cover and is connected to the upper cavity 25, and the outlet is connected to the auxiliary valve cavity above the auxiliary valve seat. The inlet of the outlet-side guide channel is connected to the central through hole of the auxiliary valve seat from below, and the outlet of the outlet-side guide channel is connected to the guide channel 26 arranged on the side wall of the main part of the valve body. A connecting pipe fitting 13 can be provided between the outlet of the outlet-side guide channel on the valve cover and the inlet of the guide channel on the side wall of the main part of the valve body. The upper and lower ends of the connecting pipe fitting are respectively inserted into the outlet of the outlet-side guide channel on the valve cover and the inlet of the guide channel on the side wall of the main part of the valve body and are respectively sealed with sealing rings to ensure the reliability and sealing of the connection between the outlet of the outlet-side guide channel on the valve cover and the inlet of the guide channel on the side wall of the main part of the valve body. The outlet of the guide channel on the side wall of the main part of the valve body is provided on the valve body wall of the lower cavity 27 and is connected to the lower cavity.

[0045] The working process of the above embodiment is mainly as follows: when closing, the electromagnetic head is powered off, the moving iron core and the auxiliary valve seat move downward together, closing the auxiliary valve sealing pair, and the medium on the inlet side is able to enter the inner cavity and the upper cavity through the damping hole. Because the medium in the upper cavity cannot flow out through the guide channel, under the action of the medium pressure on the valve inlet side, the pressure in the inner cavity and the upper cavity gradually increases, causing the valve disc to move downward, closing the main sealing pair, and the valve enters the closed state; when opening, the electromagnetic head is energized, the moving iron core drives the auxiliary valve disc to move upward, opening the auxiliary valve sealing pair, and the medium in the inner cavity and the upper cavity is able to flow into the lower cavity through the guide channel and flow out through the lower cavity. At the same time, due to the damping effect of the damping hole, under the action of the medium pressure on the valve outlet side, the pressure in the inner cavity and the upper cavity drops, the valve disc moves upward, opening the main sealing pair, and the valve enters the open state, and the medium is able to flow through the valve through the inlet cavity 21, the middle cavity 22, the central through hole of the valve seat, the lower cavity 27 and the outlet cavity 28 in this order.

[0046] Compared with the valve body disclosed in CN105650329A, the above embodiment significantly simplifies the structure of the auxiliary valve sealing pair and the guide channel, simplifies the processing technology, reduces the processing cost, and has no exposed guide connecting pipe, which is not easy to be damaged or leaked.

[0047] The electromagnetic head can adopt any electromagnetic head suitable for driving the corresponding valve body. The lower end of its moving iron core is connected to the auxiliary valve disc (auxiliary valve opening and closing part). After the coil is energized, the moving iron core drives the auxiliary valve disc to move upward and separate from the auxiliary valve seat, and the auxiliary valve sealing pair is opened. The upper chamber is connected with the lower chamber through the auxiliary valve inlet side medium channel and the outlet side medium channel. Due to the damping and throttling effect of the damping hole, the medium pressure in the inner chamber and the upper chamber drops. Under the action of the pressure difference on both sides, the main valve disc moves upward, the main valve sealing pair opens, and the valve is in an open state.

[0048] See also Figure 3-4As a preferred embodiment, the electromagnetic head can be provided with an electromagnetic head shell 30 and a coil (or excitation coil) 66, a moving iron core 63, a static iron core and a magnetic isolation tube 38 arranged vertically coaxially with the electromagnetic head shell (the central axis is located on the same vertical straight line). The coil, moving iron core and static iron core are installed in the electromagnetic head shell, and the coil is surrounded by the outside of the magnetic isolation tube and fixedly installed on the coil frame 36. The magnetic isolation tube passes through the magnetic isolation tube through-hole on the bottom plate of the electromagnetic head shell, and its top end is fixedly connected to the top plate of the electromagnetic head shell, and the bottom end is located outside the electromagnetic head shell. It can usually be fixedly installed on the magnetic isolation tube seat 39. The specific installation method can be based on actual needs.

[0049] There are two static iron cores, including a first static iron core 61 and a second static iron core 62. The main part of the first static iron core is tubular and is sleeved on the outside of the upper part of the magnetic isolation tube, located between the coil and the magnetic isolation tube, and its lower end is lower than the lower end of the second static iron core. The second static iron core and the moving iron core are usually cylindrical and are arranged in the magnetic isolation tube, wherein the second static iron core is fixedly installed in the upper part of the magnetic isolation tube, and the moving iron core is located below the second static iron core and slides with the inner wall of the magnetic isolation tube. A first working air gap H1 is left between its top surface and the lower end of the first static iron core under normal conditions (in the non-powered state, or when the moving iron core is in a low position, that is, at the lower limit of its vertical movement range). Therefore, it is inevitable that a second working gap H2 is left between the top surface of the moving iron core and the lower end of the second static iron core under normal conditions, and the vertical dimension of the second working gap is larger than the vertical dimension of the first working gap.

[0050] The magnetic isolation tube seat may be provided with a central through hole, and the lower end of the magnetic isolation tube is inserted into and fixed (for example, welded) on the central through hole of the magnetic isolation tube seat, thereby achieving fixed installation of the magnetic isolation tube on the magnetic isolation tube seat.

[0051] The bottom of the magnetic isolation pipe seat can be provided with a flange structure, which is fastened to the valve cover of the valve body by screws (bolts).

[0052] The bottom surface of the magnetic isolation pipe seat may be provided with a vertical annular flange, a groove or a tongue and groove etc. for being fixed with the corresponding structure on the upper surface of the valve cover.

[0053] The top of the first static iron core can be provided with (or is provided with) a circular disk-shaped structure. The top disk-shaped structure of the first static iron core extends radially outward from the top of the main part of the first static iron core, and its upper surface is in contact with the inner surface (lower surface) of the top plate of the electromagnetic head shell to facilitate magnetic conduction and magnetic binding.

[0054] A magnetic conductive sleeve 33 is preferably provided in the electromagnetic head housing, and the magnetic conductive sleeve is located at the connection position between the bottom plate of the electromagnetic head housing and the magnetic isolation tube. The main part of the magnetic conductive sleeve is in the shape of a sleeve and is sleeved on the magnetic isolation tube. The top height of the magnetic conductive sleeve is lower than the top surface height of the moving iron core under normal conditions, and the bottom thereof is provided with a circular disk-shaped structure. The bottom disk-shaped structure of the magnetic conductive sleeve extends radially outward from the bottom end of the main part of the magnetic conductive sleeve, and its lower surface is in contact with the inner surface (upper surface) of the bottom plate of the electromagnetic head housing to facilitate magnetic conduction and magnetic binding.

[0055] The electromagnetic head housing can be composed of a main housing (or housing body) with an open bottom and a magnetic conductive cover 31 covering the open bottom of the main housing to facilitate assembly of components in the electromagnetic head housing.

[0056] The magnetic isolation tube through hole on the electromagnetic head housing is located in the middle of the magnetic conductive cover.

[0057] The outer edge of the magnetic conductive cover may be provided with a short cylindrical connection structure, which is tightly inserted into the bottom opening of the main shell to facilitate connection and magnetic conduction.

[0058] A support sleeve 35 may be provided between the magnetic conductive cover and the magnetic isolation tube seat. The support sleeve is sleeved on the magnetic isolation sleeve located between the magnetic conductive cover and the magnetic isolation tube seat. The top end of the support sleeve is connected to the bottom surface (lower surface) of the magnetic conductive cover, and the bottom end is connected to the top surface of the magnetic isolation tube seat, forming a support between the electromagnetic head shell and the magnetic isolation tube seat to effectively hold the magnetic isolation tube.

[0059] The main part of the coil frame should usually be cylindrical and mounted on the outside of the magnetic isolation sleeve. The upper and lower ends of the coil frame are respectively provided with circular upper and lower baffles. The coil is wound in the annular space between the upper and lower baffles of the coil frame. The coil frame can be fixed on the magnetic isolation tube and / or the electromagnetic head housing in any appropriate manner.

[0060] A vertical screw may be provided on the top of the second static iron core, which passes through a screw hole provided in the center of the top plate of the electromagnetic head housing. A fastening nut 32 is screwed onto the outer side of the vertical screw, which is fastened to the electromagnetic head housing through the fastening nut. This fixing method can effectively avoid deformation or obstruction to the movement of the moving iron core that may be caused by other fixing methods (for example, welding in the magnetic isolation tube), and is easy to operate.

[0061] The vertical dimension of the first working air gap (the corresponding spacing under normal conditions) is preferably 2-3 mm to obtain sufficiently large starting power. The vertical dimension of the second working air gap can be set according to actual needs to ensure that the moving iron core has the required movement range.

[0062] When the above-mentioned setting method of the first working air gap is not suitable or needs further optimization, for example, for a high-power and large-volume electromagnetic head, the first static iron core cross-section, the second static iron core cross-section and the vertical dimensions of the first working air gap and the second working air gap under normal conditions can be set (selected) so that the suction force between the moving iron core and the static iron core at startup is 1.5-2.5 times the suction force between the moving iron core and the static iron core when the top surface of the moving iron core and the lower end of the first static iron core are at the same height. In other words, based on the requirement that the suction force between the moving iron core and the static iron core at startup is 1.5-2.5 times the suction force between the moving iron core and the static iron core when the top surface of the moving iron core and the lower end of the first static iron core are at the same height, the relative proportions between the first static iron core cross-section, the second static iron core cross-section and the vertical dimensions of the first working air gap and the second working air gap under normal conditions are determined. On this basis, the first static iron core cross-section, the second static iron core cross-section and the vertical dimensions of the first working air gap and the second working air gap under normal conditions can be selected based on the moving iron core stroke range (the range of up and down movement) and other factors. Since the reverse force on the electromagnetic head when it is started (for example, the static friction force or the self-sealing pressure of the medium of the valve involved during the start-up) is usually significantly greater than the reverse force on the electromagnetic head during the movement after the start-up and sufficient acceleration is required, the power requirement on the start-up will be significantly greater than the power requirement during the movement. According to experiments, it is appropriate to set the power on the start-up to 1.5-2.5 times the power on the movement in common applications. Under the structure of the present invention, the position where the moving iron core is least attracted by the static iron core during the movement is the position when the top surface of the moving iron core and the lower end of the first static iron core are at the same height. Therefore, it is appropriate to set the relevant dimensions of the relevant parts according to the above method. When it is necessary to increase the power on the start-up, the vertical dimension of the first working air gap can be reduced and / or the cross-sectional area of the first static iron core can be increased. The increase in the cross-sectional area of the second static iron core can increase the suction between the moving iron core and the static iron core when the top surface of the moving iron core and the lower end of the first static iron core are at the same height, but it does not contribute much to the suction on the moving iron core during the start-up.

[0063] A coil spring disengagement device is preferably provided between the movable iron core and the second static iron core, which tends to push the movable iron core and the second static iron core apart when the movable iron core and the second static iron core are in an engaged state, so as to achieve rapid and effective separation.

[0064] The coil spring disengagement device may include a coil spring 46 and a disengagement pin 48. The moving iron core is provided with a spring mounting hole located on its axis. The disengagement pin is in the shape of a cylindrical step that is thin at the top and thick at the bottom. The top of the spring mounting hole is in the shape of a necking corresponding to the disengagement pin. The inner diameter of the necking is slightly larger than the outer diameter of the upper part of the disengagement pin (a fitting gap is left between the two to allow the disengagement pin to slide up and down) and smaller than the outer diameter of the lower part of the disengagement pin (which can effectively prevent the lower part of the disengagement pin from moving upward). The coil spring is located in the spring mounting hole and is in a pre-compressed state. Its top presses against the bottom of the disengagement pin, and its bottom presses against the bottom of the spring mounting hole.

[0065] Based on the convenience of processing and assembly, the spring mounting hole can be processed into a through hole first, and the disengagement pin and coil spring can be installed from the bottom of the spring mounting hole. Then the auxiliary valve flap 44 can be installed at the lower end of the moving iron core. The top surface of the auxiliary valve flap is provided with a small cylindrical protrusion that is inserted into the spring mounting hole. The small cylindrical protrusion blocks the bottom of the spring mounting hole to form the bottom of the spring mounting hole.

[0066] The height (vertical dimension) of the upper part (the thinner cylindrical part) of the disengagement pin is greater than (slightly greater than) the length (vertical dimension) of the shrinkage at the top of the spring mounting hole. Therefore, under normal circumstances, the top end of the disengagement pin is partially exposed from the spring mounting hole. When the moving iron core and the second static iron core are attracted, the top end of the disengagement pin is pressed into the mounting coil spring hole by the bottom surface of the second static iron core. Under the action of the coil spring, the disengagement pin applies an upward pushing force to the static iron core, and the lower end of the coil spring applies a downward pushing force to the moving iron core. By appropriately selecting the elasticity and pre-compression degree of the coil spring, the magnitude of the force can be controlled so that it does not hinder the attraction of the moving and static iron cores when power is applied, and can effectively push the moving iron core away from the static iron core when power is not applied.

[0067] A junction box 69 may be mounted on the side wall of the electromagnetic head housing. The junction box is provided with connection terminals for connecting external power cables. The connection terminals are connected to the coils via wires passing through the side wall of the electromagnetic head housing.

[0068] The lower end of the moving iron core is connected to the auxiliary valve flap 44 of the valve body. The lower end of the auxiliary valve flap is provided with an auxiliary valve seal 41, which is used to form a valve sealing pair with the corresponding valve seat on the valve body. When the coil is not energized, the moving iron core is in a low position, and the auxiliary valve seal is pressed on the valve seat, so that the sealing surface on the auxiliary valve seal is connected with the sealing surface on the valve seat, cutting off the medium channel, so that the valve (corresponding sealing pair) is in a closed state. When the coil is energized, the moving iron core drives the starting member to move up to a high position, and a gap appears between the auxiliary valve seal and the valve seat, so that the valve (corresponding sealing pair) is in an open state.

[0069] The auxiliary valve sealing member may be embedded in the lower end surface (bottom surface) of the auxiliary valve disc.

[0070] An annular stepped groove for embedding the auxiliary valve seal can be provided on the lower end face of the auxiliary valve disc, the inner diameter of the annular stepped groove is smaller than the outer diameter, and the auxiliary valve seal is in the shape of a stepped column with a larger upper portion and a smaller lower portion, with its upper portion located at the inner portion of the annular stepped groove and its lower portion located at the outer portion of the annular stepped groove. The outer portion of the annular stepped groove is provided with an internal thread, and a compression sleeve 42 is screwed on it. The upper end face of the compression sleeve is pressed against the annular stepped groove and the variable diameter end face of the auxiliary valve seal (the end face formed at the boundary between the two sections), thereby fixing the auxiliary valve seal on the annular stepped groove.

[0071] The materials for each component can be selected based on their required magnetic properties. The compression sleeve, auxiliary valve disc, magnetic isolation tube seat, support sleeve, magnetic isolation tube, release pin, and spring are preferably made of diamagnetic materials. The magnetic conductive sleeve and electromagnetic head housing (including the main housing and magnetic conductive cover) are preferably made of paramagnetic materials. The moving iron core, first static iron core, and second static iron core are preferably made of soft magnetic materials.

[0072] The working process of this electromagnetic head is mainly as follows:

[0073] When not working, the coil is not energized. This state can be called normal. The moving iron core is at a low position (or the lower limit of the moving range), and the gap between it and the two static iron cores is the largest. Among them, the gap between it and the first static iron core (the gap between the top surface of the moving iron core and the lower end of the corresponding static iron core) is the first working air gap H1, and the gap between it and the second static iron core is the second working air gap H2.

[0074] During startup, the coil is energized and a magnetic field is generated in the inner hole of the coil. The magnetic circuit is divided into two loops: the magnetic lines of force in one loop pass through the moving iron core, the first working gap H1, the first static iron core, the main shell, the magnetic cover, the lower magnetic sleeve, and pass through the magnetic isolation tube wall to return to the moving iron core; the magnetic lines of force in the other loop pass through the moving iron core, the second working air gap H2, the second static iron core, the main shell, the magnetic cover, the magnetic sleeve, and pass through the magnetic tube wall to return to the moving iron core.

[0075] Under the action of magnetic lines of force (magnetic field), the attraction force generated on the first working air gap H1 between the moving iron core and the first static iron core is F1, and the moving iron core is attracted by the first static iron core; the attraction force generated on the second working air gap H2 between the moving iron core and the second static iron core is F2, and the moving iron core is attracted by the second static iron core; the moving iron core generates a solenoid force F4 under the action of the magnetic field of the inner hole of the coil in the magnetic isolation tube, driving the moving iron core to approach the second static iron core. Therefore, the moving iron core starts to start (which can be called a one-time start) under the combined action of F1, F2 and F4 in the magnetic isolation tube, forming an upward trend or upward acceleration, driving the moving iron core to approach the second static iron core. The driving force (combined force) of one start is: F 初 =F1+F2+F4.

[0076] When the moving iron core moves up to a certain extent under the joint action of F1, F2 and F4, the height of the top surface of the moving iron core is consistent with the height of the lower end of the first static iron core, the first working air gap H1 between the moving iron core and the first static iron core is closed, and the second working air gap H2 becomes (renamed as) the third working air gap H3, which can be regarded as the end of the movement process of the moving iron core under the joint action of F1, F2 and F4. At this time, the third working air gap between the moving iron core and the second static iron core is H3, and the suction force generated by the second static iron core in the third working air gap H3 is F3. The moving iron core is mainly attracted by the second static iron core, and the suction force of the first static iron core on the moving iron core can be roughly ignored. Under the joint action of the suction force F3 generated by the third working air gap H3 and the solenoid force F4, the moving iron core moves toward the second static iron core (which can be called secondary start), and the driving force (combined force) of the secondary start is F 终 =F3+F4.

[0077] When the moving iron core moves up and is attracted to the second static iron core, the moving iron core is at a high position and cannot move further up. The moving process of the moving iron core under the combined action of F3 and F4 ends, and the third working air gap H3 disappears.

[0078] When the coil is powered off, the attraction between the moving iron core and the two stationary iron cores and the solenoid force in the magnetic isolation tube disappear (there may be a small residual magnetic attraction), and the moving iron core moves downward under the action of its own weight and spring force, returning to its initial state (normal state) where the moving iron core is in a low position.

[0079] In this specification, the cavity within the inlet pipe (the main space for accommodating the medium) is referred to as the inlet cavity, the portion of the cavity within the outlet pipe located below the valve seat is referred to as the lower cavity, and the remaining portion is referred to as the outlet cavity. The portion of the cavity within the main body of the valve body located above the valve disc when the valve is closed is referred to as the upper cavity, and the portion of the cavity within the main body of the valve body located above the valve seat and not part of the upper cavity is referred to as the middle cavity. Alternatively, based on the context and for convenience, the portion of the cavity within the main body of the valve body located above the valve seat (including the upper cavity) may be collectively referred to as the middle cavity, and the cavity within the valve disc may be referred to as the inner cavity. However, whether it is the division of the various parts of the valve body (e.g., the main body, inlet pipe, outlet pipe) or the division of the various parts of the cavity within the valve body, since the valve body and the cavity within the valve body are continuous and there is no clear physical interface between the various parts, it is meaningless to pursue clear boundaries between the various parts. This method of describing the various parts facilitates the textual description and understanding of the relevant technology.

[0080] Unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means, the preferred and optional technical means disclosed in the present invention can be arbitrarily combined to form several different technical solutions.

Claims

1. A vertical solenoid valve with top inlet and bottom outlet, comprising a valve body and an electromagnetic head mounted above the valve body, characterized in that The valve body is provided with an upwardly bent inlet pipe and a downwardly bent outlet pipe, the pipe mouth of the inlet pipe faces upward, and the pipe mouth of the outlet pipe faces downward. The electromagnetic head installed above the valve body is vertical, and the movement mode of its moving iron core is vertical linear movement. The electromagnetic head is provided with an electromagnetic head shell and a coil, a moving iron core, a static iron core and a magnetic isolation tube vertically coaxially arranged with the electromagnetic head shell. The coil, the moving iron core and the static iron core are installed in the electromagnetic head shell. The coil surrounds the outside of the magnetic isolation tube and is fixedly installed on the coil frame. The magnetic isolation tube passes through the magnetic isolation tube through hole on the bottom plate of the electromagnetic head shell. The top end is fixedly connected to the top plate of the electromagnetic head shell, and the bottom end is located outside the electromagnetic head shell. The static iron core includes a first static An iron core and a second static iron core, the main part of the first static iron core is tubular, sleeved on the outer side of the upper part of the magnetic isolation tube, located between the coil and the magnetic isolation tube, and its lower end is lower than the lower end of the second static iron core, the second static iron core and the moving iron core are arranged in the magnetic isolation tube, the second static iron core is fixedly installed in the upper part of the magnetic isolation tube, the moving iron core is located below the second static iron core, and slides with the inner wall of the magnetic isolation tube, and a first working air gap is left between its top surface and the lower end of the first static iron core under normal conditions. When starting, the first working air gap between the first static iron core and the moving iron core is significantly smaller than the second working air gap between the second static iron core and the moving iron core, and the suction force between the first static iron core and the moving iron core is significantly greater than the suction force between the second static iron core and the moving iron core.

2. The top-in, bottom-out vertical solenoid valve according to claim 1, characterized in that The orifice of the inlet pipe is located directly above the orifice of the outlet pipe. The inlet pipe is bent in such a manner that it extends horizontally outward from the side of the main body of the valve body, and then bends upward so that the orifice faces upward. The outlet pipe is bent in such a manner that it extends along the horizontal extension direction of the inlet pipe from the bottom of the main body of the valve body, and then bends downward so that the orifice faces downward. The central axis at the orifice of the inlet pipe and the central axis at the orifice of the outlet pipe are both vertical and located on the same straight line.

3. The top-in, bottom-out vertical solenoid valve according to claim 1, characterized in that The valve body adopts a pilot valve structure and is provided with a main sealing pair and a secondary sealing pair. The secondary sealing pair is located above the main sealing pair. The secondary valve disc in the secondary sealing pair is located above the secondary valve seat. The lower end of the moving iron core extends into the valve body and is connected to the secondary valve disc.

4. The top-inlet and bottom-out vertical solenoid valve according to any one of claims 1 to 3, characterized in that A circular disk structure is provided on the top of the first static iron core.

5. The top-inlet and bottom-outlet vertical solenoid valve according to any one of claims 1 to 3, characterized in that The top disc-shaped structure of the first static iron core extends radially outward from the top end of the main body of the first static iron core, and the upper surface of the disc-shaped structure is in contact with the inner surface of the top plate of the electromagnetic head housing.

6. The top-inlet and bottom-out vertical solenoid valve according to any one of claims 1 to 3, characterized in that A magnetic conductive sleeve is provided in the electromagnetic head housing, and the magnetic conductive sleeve is located at the connection position between the bottom plate of the electromagnetic head housing and the magnetic isolation tube. The main part of the magnetic conductive sleeve is in the shape of a sleeve and is sleeved on the magnetic isolation tube. The top height of the magnetic conductive sleeve is lower than the top surface height of the moving iron core under normal conditions, and the bottom of the magnetic conductive sleeve is provided with a circular disk-shaped structure. The bottom disk-shaped structure of the magnetic conductive sleeve extends radially outward from the bottom end of the main part of the magnetic conductive sleeve, and its lower surface is in contact with the inner surface of the bottom plate of the electromagnetic head housing.

7. The top-inlet and bottom-out vertical solenoid valve according to any one of claims 1 to 3, characterized in that A junction box is installed on the side wall of the electromagnetic head housing. The junction box is provided with a connection terminal for connecting an external power supply cable. The connection terminal is connected to the coil via a wire passing through the side wall of the electromagnetic head housing.

8. The top-in, bottom-out vertical solenoid valve according to any one of claims 1 to 3, characterized in that Under normal circumstances, the vertical dimension of the first working air gap is 2-3 mm; alternatively, by setting the cross-section of the first static iron core, the cross-section of the second static iron core, and the vertical dimensions of the first working air gap and the second working air gap under normal circumstances, the suction force between the moving iron core and the static iron core at startup is 1.5-2.5 times the suction force between the moving iron core and the static iron core when the top surface of the moving iron core and the lower end of the first static iron core are at the same height.

9. The top-inlet and bottom-out vertical solenoid valve according to any one of claims 1 to 3, characterized in that A coil spring disengagement device is provided between the movable iron core and the second static iron core, which tends to push the movable iron core and the second static iron core apart when the movable iron core and the second static iron core are in an attracted state.

10. The top-in, bottom-out vertical solenoid valve according to claim 9, characterized in that The coil spring disengagement device includes a coil spring and a disengagement pin. The moving iron core is provided with a spring mounting hole located on its axis. The disengagement pin is in the shape of a cylindrical step that is thin at the top and thick at the bottom. The top of the spring mounting hole is in the shape of a necking corresponding to the disengagement pin. The inner diameter of the necking is slightly larger than the outer diameter of the upper part of the disengagement pin and smaller than the outer diameter of the lower part of the disengagement pin. The coil spring is located in the spring mounting hole and is in a pre-compressed state. Its top is pressed against the bottom of the disengagement pin, and its bottom is pressed against the bottom of the spring mounting hole.

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