Bottom-in and top-out vertical solenoid valve

Abstract

The present invention relates to a vertical solenoid valve with a downward inlet and an upward outlet, which comprises a valve body and an electromagnetic head installed above the valve body. Both the outlet pipe and the inlet pipe are bent pipes. The outlet pipe extends horizontally from the bottom of the main body of the valve body in a direction away from the connection side of the inlet pipe and the main body of the valve body, and then bends upward so that the pipe orifice faces upward. The inlet pipe extends downward after being connected from the side of the main body of the valve body, goes around below the outlet pipe and extends along the horizontal extension direction of the outlet pipe, and then bends downward so that the pipe orifice faces downward. The valve body can adopt a pilot valve structure, and the electromagnetic head can be provided with two static iron cores and a moving iron core. The first static iron core is sleeved on the outside 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 the vertical installation mode with a downward inlet and an upward outlet, has a large starting driving force for the electromagnetic head, requires a small driving force when the valve body is opened, and can be used for large-diameter and ultra-high-pressure pipelines with a downward inlet and an upward outlet and other suitable occasions.

Description

Technical Field

[0001] The present invention relates to a vertical solenoid valve with downward inlet and upward outlet. Background Art

[0002] Existing solenoid valves, especially pilot solenoid valves with large caliber / high power, mostly adopt a horizontal installation structure, and the central axes of the inlet interface (or interface pipe) and the outlet interface of the valve body are horizontal lines. For example, Chinese patent document CN105650329A discloses an ultra-high pressure large-caliber solenoid valve, which includes a valve body and an electromagnetic head used as a driving 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 enclose a main valve cavity. A vertical main valve flap guide sleeve is fixedly installed in the main valve cavity. A main valve flap is movably connected inside the main valve flap guide sleeve. A main valve seat is provided between the main valve cavity and the main valve lower cavity. A main valve damping through hole is provided in the lower part of the main valve flap. The middle cover and the main valve cover enclose a middle valve cavity. A middle valve seat is provided between the middle valve cavity and the middle valve upper cavity. Below the middle valve seat is a middle valve flap. The upper cover and the main valve cover enclose a sub-valve cavity. A sub-valve seat is provided between the sub-valve cavity and the sub-valve outlet cavity. Above the sub-valve seat is a sub-valve flap. The electromagnetic head is installed above the valve body. The electromagnetic head is provided with a movable iron core that can move up and down, and also provided with a static iron core, a magnetic isolation tube and a coil. The magnetic isolation tube is provided with a tube hole. The static iron core and the movable iron core are both arranged in the tube hole of the magnetic isolation tube. The coil is arranged outside the magnetic isolation tube. The static iron core is fixedly installed in the upper part of the tube hole of the magnetic isolation tube. The movable iron core is located below the static iron core and is in clearance fit with the inner wall of the tube hole of the magnetic isolation tube. This kind of solenoid valve has good sealing performance, is convenient for processing and assembly, requires less driving force, and is especially suitable for occasions requiring ultra-high pressure and large caliber.

[0003] However, due to the limitations of its internal structure and corresponding working mechanism, this kind of solenoid valve can only be installed horizontally. If this kind of solenoid valve is installed on a vertical pipeline, no matter whether the inlet side is upward or downward, it cannot work properly.

[0004] In addition, although the above-mentioned solenoid valve reduces the driving force requirement during startup to a large extent by setting a pilot valve structure, however, since the distance between the static and movable iron cores (usually called the working air gap) is the largest and the driving force is the smallest when the electromagnetic head is powered on and started, while the power demand of the valve body is the largest during startup due to various factors such as static friction and sealing force requirements, this requires the power output of the electromagnetic head when the power output is the smallest to meet the power demand when the valve power demand is the largest, which significantly increases the volume and material cost of the electromagnetic head and also causes unnecessary energy consumption. Summary of the Invention

[0005] The purpose of the present invention is to provide a vertical solenoid valve with a downward inlet and an upward outlet to be suitable for installation and use on a corresponding vertical pipeline.

[0006] A further object of the present invention is to increase the driving force of the electromagnetic head during startup to reduce the electromagnetic head configuration.

[0007] The technical solution of the present invention is: a bottom-in and top-out vertical solenoid valve, including a valve body and an electromagnetic head installed above the valve body. The valve body is provided with an inlet pipe bent downward and an outlet pipe bent upward. The pipe orifice of the inlet pipe faces downward, and the pipe orifice of the outlet pipe faces upward.

[0008] Preferably, the electromagnetic head installed above the valve body is vertical, and the moving core moves in a vertical linear motion.

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

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

[0011] Preferably, the bending mode of the outlet pipe is that after extending horizontally from the bottom of the main body part of the valve body in a direction away from the connection side of the inlet pipe and the main body part of the valve body, it bends upward after crossing the main body part of the valve body horizontally so that the pipe orifice faces upward. The bending mode of the inlet pipe is that after extending from the side of the main body part of the valve body and bending downward, it goes around below the outlet pipe and extends along the horizontal extension direction of the outlet pipe, and then bends downward so that the pipe orifice faces downward.

[0012] Preferably, the central axes of the pipe orifice of the inlet pipe and the pipe orifice of the outlet pipe are both vertical and on the same straight line to better adapt to the installation on a vertical straight pipeline.

[0013] Preferably, the valve body adopts a pilot valve structure, provided with a main seal pair and a secondary seal pair. The secondary seal pair is located above the main seal pair. The secondary valve flap in the negative seal pair is located above the secondary valve seat. The lower end of the moving core extends into the valve body and is connected to the secondary valve flap, capable of driving the secondary valve flap to move up and down.

[0014] Preferably, the electromagnetic head is provided with an electromagnetic head housing, a coil, a moving iron core, a static iron core, and a magnetic isolation tube that are vertically coaxially arranged with the electromagnetic head housing. The coil, the moving iron core, and the static iron core are installed in the electromagnetic head housing. The coil is wound around the outside of the magnetic isolation tube and fixedly installed on a coil bobbin. The magnetic isolation tube passes through a magnetic isolation tube through-hole on the bottom plate of the electromagnetic head housing, its top end is fixedly connected to the top plate of the electromagnetic head housing, and its bottom end is located outside the electromagnetic head housing. The static iron core includes a first static iron core and a second static iron core. The main body part of the first static iron core is tubular, 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 arranged inside the magnetic isolation tube. The second static iron core is fixedly installed in the upper part inside the magnetic isolation tube. The moving iron core is located below the second static iron core and is slidably matched with the inner wall of the magnetic isolation tube. There is a first working air gap between the top surface of the moving iron core and the lower end of the first static iron core under normal conditions.

[0015] Preferably, the top of the first static iron core is provided with an annular disc-shaped structure. The top disc-shaped structure of the first static iron core radially extends outward from the top end of the main body part of the first static iron core, and its upper surface fits with the inner side surface of the top plate of the electromagnetic head housing.

[0016] Preferably, a magnetic conductive sleeve is provided inside the electromagnetic head housing. The magnetic conductive sleeve is located at the connection part between the bottom plate of the electromagnetic head housing and the magnetic isolation tube. The main body part of the magnetic conductive sleeve is in a sleeve shape, sleeved on the magnetic isolation tube, its top height is lower than the top surface height of the moving iron core under normal conditions, and its bottom is provided with an annular disc-shaped structure. The bottom disc-shaped structure of the magnetic conductive sleeve radially extends outward from the bottom end of the main body part of the magnetic conductive sleeve, and its lower surface fits with the inner side surface of the bottom plate of the electromagnetic head housing.

[0017] Preferably, the electromagnetic head housing is composed of a main electromagnetic head housing with an open bottom and an electromagnetic head housing cover that covers the open bottom of the main electromagnetic head housing.

[0018] Preferably, a vertical screw is provided at the top of the second static iron core. The vertical screw passes through a screw hole in the center of the top plate of the electromagnetic head housing, and a fastening nut is screwed on its outside, and it is fastened to the electromagnetic head housing through the fastening nut.

[0019] Preferably, a junction box is installed on the side wall of the electromagnetic head housing. A wiring terminal for connecting an external power cable is provided inside the junction box, and the wiring terminal is connected to the coil through a wire passing through the side wall of the electromagnetic head housing.

[0020] Preferably, the vertical dimension of the first working air gap under normal conditions is 2 - 3 millimeters.

[0021] Preferably, by setting the cross-sectional areas of the first and second stationary iron cores and the vertical dimensions of the first and second working air gaps under normal conditions, the suction force between the moving iron core and the stationary iron core during startup is 1.5 - 2.5 times the suction force between the moving iron core and the stationary iron core when the top surface of the moving iron core and the lower end of the first stationary iron core are at the same height.

[0022] Preferably, a spiral spring detachment device is provided between the moving iron core and the second stationary iron core, which tends to push the two away from each other when they are in the attracted state.

[0023] Preferably, the spiral spring detachment device includes a spiral spring and a detachment pin. The moving iron core is provided with a spring mounting hole on its axis. The detachment pin has a columnar stepped shape that is thinner at the top and thicker at the bottom. The top of the spring mounting hole is in a necked shape corresponding to the detachment pin. The inner diameter at the necked part is slightly larger than the outer diameter of the upper part of the detachment pin and smaller than the outer diameter of the lower part of the detachment pin. The spiral spring is located in the spring mounting hole and is in a pre-compressed state. Its top presses against the bottom of the detachment pin, and its bottom presses against the bottom of the spring mounting hole.

[0024] The beneficial effects of the present invention are as follows: Due to the provision of the inlet pipe and the outlet pipe with corresponding bends and pipe orifice orientations, the interface originally adapted to be connected to a horizontal pipe is transformed into an interface adapted to be connected to a vertical pipe. Without changing the internal structure and working mechanism, the inlet is downward and the outlet is upward, allowing the medium to flow from bottom to top, and being adapted to be installed and used on a vertical pipe with a corresponding flow direction, ensuring the normal operation of the valve. Since the inlet pipe and the outlet pipe can be cast and processed together with other parts of the valve body as part of the valve body, without incurring excessive costs, compared with the horizontal connection method of adapting the valve by changing the pipe orientation on-site, the structure is simple, the cost is low, the construction is convenient, and it is not prone to failures, 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 during startup, 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). Thus, the driving force during startup is significantly increased. Furthermore, compared with the existing electromagnetic head, a smaller electromagnetic head can drive a larger load. At the same time, when the moving iron core is attracted to the second static iron core, the acting force between the first static iron core and the moving iron core is very small and can basically be ignored. Looking at the entire upward movement process of the moving iron core, the change range of the driving force is also significantly reduced, which is beneficial to reducing the impact force when the moving iron core is attracted to the second static iron core, extending the service life, and also beneficial to reducing unnecessary power consumption. Since the first static iron core is sleeved outside the second static iron core in a tubular shape, the driving force (the suction force with the moving iron core) generated by the first static iron core and the driving force generated by the second static iron core are evenly distributed in the circumferential direction, and the acting effects are the same, both vertically upward, without destroying the circumferential balance of the magnetic field due to the setting of the two static iron cores. Moreover, 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 during startup can be reasonably set, thereby optimizing the driving force change curve of the electromagnetic head during the entire attraction process and further improving the driving force characteristics. Through the improvement of the static iron core, without changing other parts substantially, a greater startup driving force / maximum driving force output can be obtained, the change range of the driving force output during the operation process can be reduced, the effective utilization rate of the driving force can be improved, higher load driving requirements can be met, which helps to reduce the volume of the electromagnetic head, lower the manufacturing cost, reduce the space occupation, reduce unnecessary energy waste, and improve energy efficiency.

[0025] It should be noted that since the valve body adapted to the solenoid valve is usually unidirectional, when the valve body is a check valve, it is not allowed to connect this valve to a vertical pipe where the medium flows from top to bottom. At the same time, for the same reason as the existing horizontal solenoid valve cannot be installed vertically, this solenoid valve is not suitable for being directly installed on a horizontal pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the solenoid valve of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure related to the valve body part;

[0028] Figure 3 This is a schematic diagram of the structure related to the solenoid head part (in the starting state);

[0029] Figure 4 This is a partial schematic diagram of the structure related to the solenoid head part (the upward movement state where the top surface of the moving iron core exceeds the lower end of the first static iron core). Detailed implementation manners

[0030] Refer to Figures 1 - 4 , the solenoid valve of the present invention includes a valve body 10 and a solenoid head (or electromagnetic drive head) 60 installed above the valve body. The valve body is provided with a downwardly bent inlet pipe 11 and an upwardly bent outlet pipe 18. The orifice of the inlet pipe faces downward, and the orifice of the outlet pipe faces upward.

[0031] The orifice of the inlet pipe can usually be directly above the orifice of the outlet pipe. The central axes of the orifice of the inlet pipe and the orifice of the outlet pipe are both vertical and preferably located on the same straight line, and can also be set at other positions according to actual needs.

[0032] For example, the bending manner (shape) of the outlet pipe can be that after extending horizontally from the bottom of the valve body main part (the part where the sealing pair is set, or in other words, the part except the inlet pipe and the outlet pipe), it extends in a direction away from the connection side of the inlet pipe and the valve body main part, so as to span the valve body main part in the horizontal direction and then bend upward to make the orifice face upward.

[0033] The bending manner (shape) of the inlet pipe can be that after extending downward from the side of the valve body main part, it bends around to the lower side of the outlet pipe and extends along the horizontal extension direction of the outlet pipe, and then bends downward to make the orifice face downward.

[0034] The horizontal extension parts of the inlet pipe and the outlet pipe can be integrally formed, or in other words, the bottom of the horizontally extending and vertically adjacent outlet pipe and the top of the inlet pipe are integrated, thereby reducing the volume and material usage and facilitating preparation.

[0035] A connecting rib 19 can be provided between the vertical parts of the inlet pipe and the outlet pipe to improve the integrity and strength.

[0036] Usually, the orifices of the inlet pipe and the outlet pipe are adapted to the same pipe diameter for connection, and can be directly connected to the same vertical pipe or connected to the same vertical pipe using connection fittings of the same specification.

[0037] Generally, flange structures for connecting to external pipelines are provided at both the inlet pipe orifice and the outlet pipe orifice.

[0038] The valve seat of the valve body (including the main valve seat and the secondary valve seat when a pilot valve structure is adopted) is usually horizontally arranged. The valve flap (including the main valve flap and the secondary valve flap when a pilot valve structure is adopted) that forms 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 passage 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 flap sealing surface (the sealing surface on the valve flap) that forms the valve sealing with the valve seat sealing surface is also a rotating surface with a vertical rotation axis, and the rotation axes of the valve seat sealing surface and the valve flap sealing surface coincide and are the same straight line.

[0039] According to the characteristics of the solenoid head, the solenoid head installed above the valve body should usually be vertical, the movement mode of its moving iron core is vertical linear movement, and the lower end of the moving iron core extends into the valve body of the valve body to connect the opening and closing member (valve flap, or the secondary valve flap when a pilot valve structure is adopted) that requires external force drive, driving the connected opening and closing member to move up and down.

[0040] In the case where the valve flap is located above its corresponding valve seat, the upward movement of the moving iron core opens the valve, and the downward movement closes the valve.

[0041] The valve body can adopt any solenoid valve body that can be horizontally installed. For example, the valve body disclosed in CN105650329A can, on the basis of other unchanged parts, set the inlet-side tubular structure and the outlet-side tubular structure of its valve body as the inlet pipe and the outlet pipe defined by the present invention.

[0042] To adapt to large-diameter / large-flow and high-pressure (ultra-high pressure) pipelines, the valve body preferably adopts a pilot valve structure to reduce the driving force requirement during startup. The valve body with a pilot valve structure is provided with a main sealing pair and a secondary sealing pair (or called a pilot sealing pair). The secondary sealing pair is located above the main sealing pair. The secondary valve flap in the secondary sealing pair is located above the secondary valve seat. The lower end of the moving iron core is connected to the secondary valve flap (the valve flap of the secondary sealing pair), and can drive the secondary valve flap to move up and down. The valve body disclosed in CN105650329A adopts a pilot valve structure and can well adapt to ultra-high pressure / large-diameter occasions.

[0043] See Figure 2, the present invention provides a preferred embodiment of the valve body with a pilot valve structure. Its inlet pipe 11 is connected to the side wall of the main body part of the valve body, and the outlet pipe 18 is connected to the bottom of the main body part of the valve body. The connection parts are all smoothly transitioned. By bending the inlet pipe and the outlet pipe, the orifice of the inlet pipe faces downward, and the orifice of the outlet pipe faces upward to adapt to the connection mode of bottom-in and top-out.

[0044] A horizontal valve seat (or main valve seat) 16 is provided inside the main body part of the valve body. The valve seat is located at the bottom of the middle cavity 22 inside the valve body. Its vertical central through hole constitutes the only way for the main medium passage. Above the valve seat, there is a valve flap (or main valve flap) 15 that can move up and down. The valve flap is cup-shaped, with a cylindrical side surface and a valve flap seal (or main valve flap seal) at the bottom. The valve flap seal is provided with a valve flap sealing surface (or main valve flap sealing surface) corresponding to the valve seat sealing surface (or main valve seat sealing surface); alternatively, according to the structure of this valve sealing pair (or main sealing pair), the valve flap seal can also be not provided, and the valve flap sealing surface can be directly set on the corresponding part at the bottom of the valve flap (for example, after surfacing the sealing surface material on the corresponding part at the bottom of the valve flap and then machining to form the sealing surface. Usually, the valve seat sealing surface can also be set in this way). A damping hole 29 communicating the inner cavity 24 and the inlet cavity 21 (which can pass through the part of the middle cavity 22 directly communicating with the inlet cavity) is provided at the lower part of the side wall or the bottom of the valve flap. A guide sleeve 14 for guiding and cooperating with the valve flap is provided inside the main body part of the valve body. The cooperation mode between the side surface of the valve flap and the inner wall of the guide sleeve is a sliding seal cooperation (multiple annular sealing rings can be provided between the two to better achieve the seal under the sliding cooperation), that is, allowing the valve flap to slide up and down and not allowing the medium to pass through between the two (sealing). 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 part of the valve body. There is a gap between the outer side surface of the lower part of the guide sleeve and the inner wall of the main body part of the valve body. There is also a gap between the lower end of the guide sleeve and the inner wall (bottom wall) of the main body part of the valve body. These gaps form a part of the middle cavity.

[0045] A valve cover 12 is provided at the top of the main body part of the valve body to cover the top opening of the main body part of the valve body. A diversion channel is provided inside the valve cover. A pilot valve cavity is provided on the diversion channel. A pilot valve seat 17 is provided at the bottom of the pilot valve cavity. The pilot valve seat is horizontally arranged, and its vertical central through hole constitutes the only way for the diversion channel. Above the pilot valve seat, there is a pilot valve flap 44 that can move up and down. The pilot valve seat and the pilot valve flap are provided with mutually cooperating pilot valve sealing surfaces to achieve pilot valve sealing. The magnetic isolation tube seat 39 of the electromagnetic head is fixedly installed on the valve cover to cover the top opening of the pilot valve cavity, making the pilot valve cavity with an open top on the valve cover form a closed cavity. The lower end of the moving iron core 63 of the electromagnetic head is connected to the top of the pilot valve flap and can drive the pilot valve flap to move up and down to realize the opening and closing of the pilot valve sealing pair (the valve sealing pair composed of the pilot valve seat and the pilot valve flap).

[0046] The diversion channels on the valve cover are divided into two parts. Among them, the inlet of the inlet-side diversion channel 23 is arranged on the bottom surface of the valve cover and communicates with the upper cavity 25. The outlet communicates with the auxiliary valve cavity above the auxiliary valve seat. The inlet of the outlet-side diversion channel communicates with the central through hole of the auxiliary valve seat from below. The outlet of the outlet-side diversion channel communicates with the diversion channel 26 arranged on the side wall of the main body part of the valve body. A connecting pipe fitting 13 can be arranged between the outlet of the outlet-side diversion channel on the valve cover and the inlet of the diversion channel on the side wall of the main body 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 diversion channel on the valve cover and the inlet of the diversion channel on the side wall of the main body part of the valve body and are respectively provided with sealing rings for sealing to ensure the reliability and tightness of the connection between the outlet of the outlet-side diversion channel on the valve cover and the inlet of the diversion channel on the side wall of the main body part of the valve body. The outlet of the diversion channel on the side wall of the main body part of the valve body is arranged on the valve body wall of the lower cavity 27 and communicates with the lower cavity.

[0047] The working process of the above embodiment is mainly as follows: When closed, the electromagnetic head is powered off, and the moving iron core and the auxiliary valve seat move downward together to close the auxiliary valve sealing pair. The medium on the inlet side can enter the inner cavity and the upper cavity through the damping hole. Since the medium in the upper cavity cannot flow out through the diversion channel, under the action of the medium pressure on the inlet side of the valve, the pressure in the inner cavity and the upper cavity gradually increases, causing the valve flap to move downward to close the main sealing pair, and the valve enters the closed state. When opening, the electromagnetic head is powered on, the moving iron core drives the auxiliary valve flap to move upward to open the auxiliary valve sealing pair. The medium in the inner cavity and the upper cavity can flow into the lower cavity through the diversion 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 outlet side of the valve, the pressure in the inner cavity and the upper cavity decreases, the valve flap moves upward to open the main sealing pair, and the valve enters the open state. The medium can flow through the valve in turn 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.

[0048] Compared with the valve body disclosed in CN105650329A, the above embodiment significantly simplifies the structure of the auxiliary valve sealing pair and the diversion channel, simplifies the processing technology, reduces the processing cost, and has no exposed diversion connecting pipe, making it not easily damaged and not easily leaking.

[0049] 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 flap (auxiliary valve opening and closing part). After the coil is energized, the moving iron core drives the auxiliary valve flap to move upward, disengaging from the auxiliary valve seat, and the auxiliary valve sealing pair is opened. The upper cavity communicates with the lower cavity through the medium channels on the inlet side and the outlet side of the auxiliary valve. Limited by the damping and throttling effects of the damping hole, the medium pressure in the inner cavity and the upper cavity decreases. Under the action of the pressure difference on both sides, the main valve flap moves upward, and the main valve sealing pair is opened, and the valve is in the open state.

[0050] See Figures 3 - 4, As a preferred embodiment, the electromagnetic head may be provided with an electromagnetic head housing 30 and a coil (or excitation coil) 66, a moving iron core 63, a stationary iron core, and a magnetic isolation tube 38 that are vertically coaxially arranged with the electromagnetic head housing (the central axes are located on the same vertical line). The coil, the moving iron core, and the stationary iron core are installed inside the electromagnetic head housing. The coil is wound around the outside of the magnetic isolation tube and is fixedly installed on a coil bobbin 36. The magnetic isolation tube passes through a magnetic isolation tube through-hole on the bottom plate of the electromagnetic head housing, its top end is fixedly connected to the top plate of the electromagnetic head housing, and its bottom end is located outside the electromagnetic head housing and can usually be fixedly installed on a magnetic isolation tube seat 39. The specific installation method can be based on actual needs.

[0051] The number of the stationary iron cores is two, including a first stationary iron core 61 and a second stationary iron core 62. The main body part of the first stationary iron core is tubular, 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 stationary iron core. The second stationary iron core and the moving iron core are usually cylindrical and are arranged inside the magnetic isolation tube. Among them, the second stationary iron core is fixedly installed in the upper part inside the magnetic isolation tube, and the moving iron core is located below the second stationary iron core and is slidably matched with the inner wall of the magnetic isolation tube. There is a first working air gap H1 between the top surface of the moving iron core and the lower end of the first stationary iron core under normal conditions (when not energized, or when the moving iron core is in the lower position, that is, at the lower limit of its vertical movement range). Therefore, inevitably, there is a second working gap H2 between the top surface of the moving iron core and the lower end of the second stationary 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.

[0052] The magnetic isolation tube seat may be provided with a central through-hole, and the lower end of the magnetic isolation tube is inserted and fixed (for example, welded) into the central through-hole of the magnetic isolation tube seat, thereby realizing the fixed installation of the magnetic isolation tube on the magnetic isolation tube seat.

[0053] The bottom of the magnetic isolation tube seat may be provided with a flange structure and is fastened to the valve cover of the valve body by screws (bolts).

[0054] The bottom surface of the magnetic isolation tube seat may be provided with a vertical annular flange, groove, or rabbet for clamping with the corresponding structure on the upper surface of the valve cover.

[0055] The top of the first stationary iron core may be provided with (or is provided with) a disc-shaped structure in the shape of a circular ring. The top disc-shaped structure of the first stationary iron core extends radially outward from the top end of the main body part of the first stationary iron core, and its upper surface fits with the inner surface (lower surface) of the top plate of the electromagnetic head housing to facilitate magnetic conduction and magnetic flux concentration.

[0056] Preferably, a magnetic conduction sleeve 33 is provided inside the electromagnetic head housing. The magnetic conduction sleeve is located at the connection part between the bottom plate of the electromagnetic head housing and the magnetic isolation tube. The main part of the magnetic conduction sleeve is in the shape of a sleeve and is sleeved on the magnetic isolation tube. The height of its top is lower than the top surface height of the moving iron core under normal conditions. Its bottom is provided with a disc-shaped structure in a circular ring shape. The disc-shaped structure at the bottom of the magnetic conduction sleeve extends radially outward from the bottom end of the main part of the magnetic conduction sleeve, and its lower surface is attached to the inner surface (upper surface) of the bottom plate of the electromagnetic head housing to facilitate magnetic conduction and magnetic focusing.

[0057] The electromagnetic head housing can be composed of a main housing (or housing body) with an open bottom and a magnetic conduction cover 31 covering the open bottom of the main housing to facilitate the assembly of the components inside the electromagnetic head housing.

[0058] The magnetic isolation tube through hole on the electromagnetic head housing is located in the middle of the magnetic conduction cover.

[0059] The outer edge of the magnetic conduction cover can be provided with a short tube-shaped connection structure, which is tightly inserted into the open bottom of the main housing to facilitate connection and magnetic conduction.

[0060] A support sleeve 35 can be provided between the magnetic conduction cover and the magnetic isolation tube seat. The support sleeve is sleeved on the magnetic isolation sleeve located between the magnetic conduction cover and the magnetic isolation tube seat. Its top end is connected to the bottom surface (lower surface) of the magnetic conduction cover, and its bottom end is connected to the top surface of the magnetic isolation tube seat to form a support between the electromagnetic head housing and the magnetic isolation tube seat to effectively hold the magnetic isolation tube.

[0061] The main part of the coil bobbin should generally be in a cylindrical shape and is sleeved on the outside of the magnetic isolation sleeve. Circular upper and lower baffles are respectively provided at its upper and lower ends. The coil is wound in the annular space between the upper and lower baffles of the coil bobbin. The coil bobbin can be fixed to the magnetic isolation tube and / or the electromagnetic head housing in any suitable manner.

[0062] A vertical screw can be provided at the top of the second static iron core. The vertical screw passes through the screw hole provided in the center of the top plate of the electromagnetic head housing, and a fastening nut 32 is screwed on its outside. It is fastened to the electromagnetic head housing through the fastening nut. This fixing method can effectively avoid the deformation or interference with the movement of the moving iron core caused by other fixing methods (for example, welding inside the magnetic isolation tube), and is convenient for operation.

[0063] The vertical dimension of the first working air gap (the corresponding spacing under normal conditions) is preferably 2-3 mm to obtain sufficient 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 moving range.

[0064] When the above setting method of the first working air gap is not suitable or needs further optimization, for example, for a large-power and large-volume electromagnetic head, the cross-sectional area of the first static iron core, the cross-sectional area 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 can be set (selected) so that 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. Or rather, according to the requirement that 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, the relative ratio between the cross-sectional area of the first static iron core, the cross-sectional area 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 is determined. On this basis, the cross-sectional area of the first static iron core, the cross-sectional area 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 can be selected according to the moving iron core stroke range (the range of up and down movement) and other factors. Since the reverse force suffered by the electromagnetic head during startup (for example, the static friction involved during startup or the self-sealing pressure of the medium of the valve, etc.) is usually significantly greater than the reverse force suffered during the movement after startup and sufficient acceleration needs to be formed, the power demand during startup is significantly greater than the power demand during the movement. According to experiments, it is appropriate to set the power during startup to 1.5 - 2.5 times the power during the movement in common applications. And in the structure of the present invention, the position where the moving iron core is subjected to the minimum suction force from the static iron core during the movement of the moving iron core is the position where 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 components according to the above method. When it is necessary to increase the power during startup, 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 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, but it contributes little to the suction force suffered by the moving iron core during startup.

[0065] Preferably, a spiral spring detachment device that tends to push the moving iron core and the second static iron core away from each other when they are in the attracted state is provided between the moving iron core and the second static iron core to achieve rapid and effective separation.

[0066] The spiral spring detachment device may include a spiral spring 46 and a detachment pin 48. The moving iron core is provided with a spring mounting hole on its axis. The detachment pin is in the shape of a columnar step with a thinner upper part and a thicker lower part. The top of the spring mounting hole is in a constricted shape corresponding to the detachment pin. The inner diameter at the constricted part is slightly larger than the outer diameter of the upper part of the detachment pin (there is a fitting gap allowing the detachment pin to slide up and down between them) and smaller than the outer diameter of the lower part of the detachment pin (which can effectively block the upward movement of the lower part of the detachment pin). The spiral spring is located in the spring mounting hole and is in a pre-compressed state. Its top presses against the bottom of the detachment pin, and its bottom presses against the bottom of the spring mounting hole.

[0067] Based on the convenience of processing and assembly, the spring mounting hole can be first processed into a through hole. The release pin and the helical spring are inserted from the bottom opening of the spring mounting hole, and then the auxiliary valve flap 44 is installed at the lower end of the moving iron core. A cylindrical small protrusion for inserting into the spring mounting hole is provided on the top surface of the auxiliary valve flap, and this cylindrical small protrusion blocks the bottom opening of the spring mounting hole to form the bottom of the spring mounting hole.

[0068] The height (vertical dimension) of the upper part (the thinner cylindrical part) of the release pin is greater than (slightly greater than) the length (vertical dimension) of the constriction at the top of the spring mounting hole. Thus, under normal conditions, the top end of the release pin protrudes from the spring mounting hole by a part. When the moving iron core is attracted to the second static iron core, the top end of the release pin is pressed into the helical spring mounting hole by the bottom surface of the second static iron core. The release pin applies an upward pushing force to the static iron core under the action of the helical spring, and the lower end of the helical spring applies a downward pushing force to the moving iron core. By appropriately selecting the elasticity and pre-compression degree of the helical spring, the magnitude of this force can be controlled so that it does not prevent the attraction of the moving and static iron cores when energized and can effectively push the moving iron core away from the static iron core when not energized.

[0069] The junction box 69 can be installed on the side wall of the solenoid head housing. The junction box is provided with connection terminals for connecting external power supply cables, and the connection terminals are connected to the coil through wires passing through the side wall of the solenoid head housing.

[0070] 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 for forming a valve seal pair with the corresponding valve seat on the valve body. When the coil is not energized, the moving iron core is in the low position, and the auxiliary valve seal presses on the valve seat, so that the sealing surface on the auxiliary valve seal is in contact with the sealing surface on the valve seat, cutting off the medium passage and making the valve (the corresponding seal pair) in the closed state. When the coil is energized, the moving iron core drives the starting member to move up to the high position, and a gap appears between the auxiliary valve seal and the valve seat, making the valve (the corresponding seal pair) in the open state.

[0071] The auxiliary valve seal can be embedded on the lower end surface (bottom surface) of the auxiliary valve flap.

[0072] The lower end surface of the auxiliary valve flap can be provided with an annular stepped groove for embedding the auxiliary valve seal. The inner diameter of the inner section of the annular stepped groove is smaller than the outer diameter. The auxiliary valve seal is in the shape of a stepped cylinder with a larger upper part and a smaller lower part. Its upper section is located in the inner section of the annular stepped groove, and its lower section is located in the outer section of the annular stepped groove. The outer section of the annular stepped groove is provided with an internal thread, and a compression sleeve 42 is screwed on. The upper end surface of the compression sleeve presses on the annular stepped groove and the variable diameter end surface of the auxiliary valve seal (the end surface formed at the boundary between the two sections), thereby realizing the fixation of the auxiliary valve seal on the annular stepped groove.

[0073] The materials of each part can be selected according to the required magnetic properties of each part. Among them, the pressing sleeve, the secondary valve flap, the magnetic isolation tube seat, the support sleeve, the magnetic isolation tube, the disengaging pin and the spring are preferably made of diamagnetic materials, the magnetic conduction sleeve and the electromagnetic head housing (including the main housing and the magnetic conduction cover) are preferably made of paramagnetic materials, and the moving iron core, the first static iron core and the second static iron core are preferably made of soft magnetic materials.

[0074] The working process of this electromagnetic head is mainly as follows:

[0075] When not working, the coil is not energized, and this state can be called the normal state. The moving iron core is at the low position (or the lower limit position of the moving range), and the gap between it and the two static iron cores is the largest. Among them, the gap between the moving iron core 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 the moving iron core and the second static iron core is the second working air gap H2.

[0076] When starting, 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 force lines of one loop pass through the moving iron core, the first working gap H1, the first static iron core, the main housing, the magnetic conduction cover, the lower magnetic conduction sleeve, and pass through the magnetic isolation tube wall and return to the moving iron core; the magnetic force lines of the other loop pass through the moving iron core, the second working air gap H2, the second static iron core, the main housing, the magnetic conduction cover, the magnetic conduction sleeve, and pass through the magnetic conduction tube wall and return to the moving iron core.

[0077] Under the action of the magnetic force lines (magnetic field), the suction 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 suction 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 in 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 the first start) under the combined action of F1, F2 and F4 in the magnetic isolation tube, forming an upward movement trend or an upward acceleration, driving the moving iron core to approach the second static iron core. The driving force (resultant force) of the first start is: F 初 = F1 + F2 + F4.

[0078] When the moving iron core moves upward to a certain extent under the combined action of F1, F2, and F4, the top surface height of the moving iron core is the same as the lower end height of the first static iron core, the first working air gap H1 between the moving iron core and the first static iron core closes, and the second working air gap H2 becomes (is renamed) the third working air gap H3. It can be considered that the movement process of the moving iron core under the combined action of F1, F2, and F4 ends. 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 approximately ignored. Under the combined action of the suction force F3 generated by the moving iron core in the third working air gap H3 and the solenoid force F4, the moving iron core moves towards the second static iron core (which can be called the secondary start). The driving force (resultant force) F of the secondary start 终 = F3 + F4.

[0079] When the moving iron core moves upward and engages with the second static iron core, the moving iron core is in a high position and cannot continue to move upward. The movement process of the moving iron core under the combined action of F3 and F4 ends, and the third working air gap H3 disappears.

[0080] When the coil is powered off, the suction force between the moving iron core and the two static iron cores and the solenoid force in the magnetic isolation tube both disappear (there may be a tiny residual magnetic suction force). The moving iron core moves downward under the action of its own weight and the spring force and returns to the initial state (normal state) where the moving iron core is in a low position.

[0081] In this specification, the cavity in the inlet pipe (the main space for accommodating the medium) is called the inlet cavity, the part of the cavity in the outlet pipe below the valve seat is called the lower cavity, the remaining part is called the outlet cavity, the part of the cavity in the main body of the valve body above the valve flap in the valve closed state is called the upper cavity, the part of the cavity in the main body of the valve body above the valve seat and not belonging to the upper cavity is called the middle cavity. Or, based on the context and for the convenience of expression, the part of the cavity in the main body of the valve body above the valve seat (including the upper cavity) can also be collectively called the middle cavity, and the cavity in the valve flap is called the inner cavity. However, whether it is the division of each part in the valve body entity (such as the main body part, inlet pipe, outlet pipe) or the division of each part in the cavity in the valve body, since the valve body and the cavity in the valve body are continuous and there is no clear physical interface between each part, it is meaningless to pursue a clear boundary between each part. This way of expressing each part is convenient for the written expression and understanding of related technologies.

[0082] Except as otherwise specified and except when one preferred or optional technical means is a further limitation of another technical means, the various preferred and optional technical means disclosed in the present invention can be arbitrarily combined to form several different technical solutions.

Claims

1. The vertical solenoid valve with downward inlet and upward outlet, comprising a valve body and an electromagnetic head installed above the valve body, is characterized in that The valve body is provided with a downwardly bent inlet pipe and an upwardly bent outlet pipe. The orifice of the inlet pipe faces downward, and the orifice of the outlet pipe faces upward. The orifice of the inlet pipe is directly below the orifice of the outlet pipe. The outlet pipe is bent in such a way that after extending horizontally from the bottom of the main body of the valve body in a direction away from the connection side of the inlet pipe and the main body of the valve body, it bends upward after spanning across the main body of the valve body horizontally, so that the orifice faces upward. The inlet pipe is bent in such a way that after extending from the side of the main body of the valve body, it bends downward, goes around below the outlet pipe and extends along the horizontal extension direction of the outlet pipe, and then bends downward so that the orifice faces downward. The central axes at the orifices of the inlet pipe and the outlet pipe are both vertical and on the same straight line. The valve seat of the valve body is horizontally arranged, and the valve flap forming 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.

2. The bottom-inlet and top-outlet 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 flap in the secondary sealing pair is located above the secondary valve seat. The lower end of the moving iron core of the electromagnetic head extends into the valve body and is connected to the secondary valve flap.

3. The bottom-inlet and top-outlet vertical solenoid valve according to claim 1 or 2, characterized in that The electromagnetic head is provided with an electromagnetic head housing and a coil, a moving iron core, a static iron core, and a magnetic isolation tube that are vertically coaxially arranged with the electromagnetic head housing. The coil, the moving iron core, and the static iron core are installed in the electromagnetic head housing. The coil is wound around the outside of the magnetic isolation tube and is fixedly installed on a coil holder. The magnetic isolation tube passes through a magnetic isolation tube through hole on the bottom plate of the electromagnetic head housing, its top end is fixedly connected to the top plate of the electromagnetic head housing, and its bottom end is outside the electromagnetic head housing. The static iron core includes a first static iron core and a second static iron core. The main body 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 arranged inside the magnetic isolation tube. The second static iron core is fixedly installed in the upper part inside the magnetic isolation tube. The moving iron core is located below the second static iron core and is slidably matched with the inner wall of the magnetic isolation tube. There is a first working air gap between its top surface and the lower end of the first static iron core under normal conditions.

4. The bottom-inlet and top-outlet vertical solenoid valve according to claim 3, wherein The top of the first static iron core is provided with a circular disk-shaped structure. The disk-shaped structure at the top of the first static iron core radially extends outward from the top end of the main body part of the first static iron core, and its upper surface fits with the inner surface of the top plate of the electromagnetic head housing.

5. The bottom-inlet and top-outlet vertical solenoid valve according to claim 3, characterized in that A magnetic conducting sleeve is arranged inside the electromagnetic head housing. The magnetic conducting sleeve is located at the connection part between the bottom plate of the electromagnetic head housing and the magnetic isolation tube. The main body part of the magnetic conducting sleeve is in the shape of a sleeve and is sleeved on the magnetic isolation tube. Its top height is lower than the top surface height of the moving iron core under normal conditions. Its bottom is provided with a circular disk-shaped structure. The disk-shaped structure at the bottom of the magnetic conducting sleeve radially extends outward from the bottom end of the main body part of the magnetic conducting sleeve, and its lower surface fits with the inner surface of the bottom plate of the electromagnetic head housing.

6. The bottom-inlet and top-outlet vertical solenoid valve according to claim 3, characterized in that A junction box is installed on the side wall of the electromagnetic head housing. The junction box is provided with terminal blocks for connecting external power supply cables. The terminal blocks are connected to the coil through wires passing through the side wall of the electromagnetic head housing.

7. The bottom-inlet and top-outlet vertical solenoid valve according to claim 3, characterized in that Under normal conditions, the vertical dimension of the first working air gap is 2-3 mm; alternatively, by setting the cross-sections of the first static iron core, the second static iron core, and the vertical dimensions of the first and second working air gaps 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 is at the same height as the lower end of the first static iron core.

8. The bottom-in and top-out type vertical solenoid valve according to claim 3, characterized in that A spiral spring detachment device that tends to push the moving iron core and the second static iron core away from each other when they are in the attracted state is provided between the moving iron core and the second static iron core.

9. The bottom-inlet and top-outlet vertical solenoid valve according to claim 8, characterized in that The spiral spring detachment device includes a spiral spring and a detachment pin. The moving iron core is provided with a spring mounting hole on its axis. The detachment pin is in the shape of a columnar step with a thinner upper part and a thicker lower part. The top of the spring mounting hole is in a constricted shape corresponding to the detachment pin. The inner diameter at the constricted part is slightly larger than the outer diameter of the upper part of the detachment pin and smaller than the outer diameter of the lower part of the detachment pin. The spiral spring is located in the spring mounting hole and is in a pre-compressed state. Its top presses against the bottom of the detachment pin, and its bottom presses against the bottom of the spring mounting hole.

Images