CN217233683U - Automatic drainage device for filter negative pressure system - Google Patents

Abstract

The utility model discloses an automatic drainage device for a negative pressure system of a filter, which comprises an upper valve body, a cylindrical shell and a lower valve body, wherein the upper valve body, the cylindrical shell and the lower valve body form a valve cavity; a coil, a central pipe and a double-control valve core are arranged in the valve cavity, and an air inlet hole communicated with the environment and an air outlet hole upwards communicated with a filter water collecting cup are arranged in the upper valve body; a water discharge inlet hole which is communicated with the filter water collecting cup upwards is arranged in the upper valve body, and a water discharge outlet hole which is communicated with the environment downwards is arranged in the lower valve body; when the coil is electrified, the air passage and the water passage are communicated at the position of the double-control valve core at the same time; when the coil loses power, the air circuit and the water circuit are simultaneously blocked at the double-control valve core. The utility model discloses have gas circuit water route binary channels, solved the problem of unable drainage under the negative pressure condition, and urine is easy to install, has general nature, can extensively use widely in the fuel filter that negative pressure system used, solves artifical drainage dismouting difficulty, untimely to and the personnel's clothing that artifical drainage brought is polluted by the greasy dirt problem.

Description

Automatic drainage device for filter negative pressure system

Technical Field

The utility model relates to a diesel engine fuel filtration system technical field.

Background

In the VI emission regulation stage of China, the requirement of a diesel engine on the separation efficiency of water in fuel is higher and higher, the separated water is deposited in a water collecting cup at the lower end of a filter after the fuel is filtered and separated by a diesel filter, when the accumulation amount of the water in the water collecting cup reaches a set limit value continuously along with time, if the water in the water collecting cup is not discharged in time, the water can enter a filter element of the filter to extrude the volume space occupying the fuel, the filtering of the filter on the fuel and the separation of the oil and the water can be influenced, the oil passing amount of the filter can be influenced in serious conditions, the insufficient oil supply to the engine is caused, and even the engine is flameout.

In order to solve the problems, the water in the water collecting cup needs to be discharged in time. At present, the most common mode is that a plug is arranged at the lower end of a water collecting cup of a filter, and the plug is opened manually at regular intervals to drain water; when the water level in the water collecting cup reaches or exceeds the water discharge level set by the vehicle-mounted ECU, a driver needs to discharge water at any time after receiving the alarm of the vehicle-mounted ECU, but the fuel filter is in a negative pressure state when working, and at the moment, water cannot be smoothly discharged even though the water is discharged (similar to the situation that after an air inlet pipe on an infusion bottle is blocked, normal infusion cannot be carried out unless the infusion bottle is flattened by atmospheric pressure).

The requirement of manual drainage on the subjective positivity of people is high, the requirement on the space of the installation position of the filter has large allowance, and the vehicle with a compact engine is difficult to realize. In addition, manual drainage can cause oil contamination to the operator. Therefore, manual drainage schemes have significant drawbacks.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic drainage device is used to filter negative pressure system solves the problem of burning unable drainage under the oil cleaner negative pressure state to small in size is in the installation.

In order to achieve the purpose, the automatic drainage device for the negative pressure system of the filter comprises an upper valve body, a cylindrical shell and a lower valve body which are sequentially connected from top to bottom, wherein the lower valve body is screwed or welded with the cylindrical shell, and the upper valve body, the cylindrical shell and the lower valve body enclose a valve cavity;

a vertically arranged central tube is arranged in the valve cavity, a horizontal upper end cover is arranged at the upper end of the central tube in a radially extending manner, a horizontal lower end cover is arranged at the lower end of the central tube in a radially extending manner, the upper end cover is in sealing fit with the top of the inner wall of the cylindrical shell, and the lower end cover is in sealing fit with the bottom of the inner wall of the cylindrical shell;

an air inlet hole communicated with the environment and an air outlet hole upwards communicated with a filter water collecting cup are formed in the upper valve body;

a water discharge inlet hole which is communicated with the filter water collecting cup upwards is arranged in the upper valve body, and a water discharge outlet hole which is communicated with the environment downwards is arranged in the lower valve body;

the central tube, the upper end cover, the lower end cover and the inner wall of the cylindrical shell form an annular cavity, a coil is arranged in the annular cavity and is used for being connected with the vehicle-mounted ECU through a vehicle-mounted circuit;

a double-control valve core is arranged in the central tube, an air inlet hole and an air outlet hole form an air path passing through the double-control valve core, and a water outlet hole form a water path passing through the double-control valve core;

when the coil is electrified, the air passage and the water passage are communicated at the position of the double-control valve core at the same time; when the coil loses power, the air circuit and the water circuit are simultaneously blocked at the double-control valve core.

An upper sealing groove is formed in the circumferential surface of the upper end cover, an annular upper sealing ring is arranged in the upper sealing groove, and the upper sealing ring is in compression joint with the inner wall of the cylindrical shell;

the lower surface of the lower end cover is provided with a bottom groove in a downward protruding mode, a lower sealing ring is arranged in the bottom groove, and the lower sealing ring is in pressure joint with a convex ring protruding into the bottom groove upwards from the top surface of the lower valve body.

The double-control valve element comprises a fixed iron core embedded in the middle of the central tube in the vertical direction, an upper movable iron core is arranged in the central tube above the fixed iron core, and a lower movable iron core is arranged in the central tube below the fixed iron core;

the winding direction of the part of the coil above the fixed iron core is opposite to the winding direction of the part of the coil below the fixed iron core;

the top surface of the upper end cover is provided with a groove with an upward opening, and the groove and the upper valve body above the groove form a water-through ventilation cavity in an enclosing manner; the water and air passing cavity is respectively communicated with the air inlet hole and the air outlet hole;

the interface of the air inlet hole communicated with the water-through ventilation cavity is positioned right above the upper movable iron core and is called as an upper interface;

the top end of the upper movable iron core is connected with an upper sphere, and the middle upper part of the upper sphere protrudes upwards to form the upper movable iron core; an upper step hole is arranged in the center of the lower part of the upper movable iron core, and an upper reset spring is arranged between the upper step hole and the fixed iron core in a pressing way; when the coil is in power failure, the upper reset spring presses the upper sphere onto the upper connector through the upper movable iron core and seals the upper connector, and the air inlet hole is isolated from the air outlet hole in the state;

when the coil is electrified, the upper movable iron core compresses the upper return spring downwards to enable the upper ball body to leave the upper interface downwards, and the air inlet is communicated with the air outlet through the water-through ventilation cavity in the state;

the center of the fixed iron core is provided with an upper through water passing hole and a lower through water passing hole, the water passing hole is provided with an annular boss which is inwards and radially protruded at the upper middle part and the lower middle part, and the top surface of the annular boss is upwards matched with the upper reset spring in a jacking manner;

the two opposite side surfaces of the upper movable iron core above the upper step hole are respectively provided with an upper water passing step in a concave manner, and an upper water passing cavity is defined by the upper water passing step and the central tube; an upper water through hole for communicating the upper water passing cavity with the upper step hole is formed in the upper movable iron core at the bottom of the upper water passing step;

the part of the bottom groove in the convex ring and the lower valve body below the bottom groove form a water through cavity in a surrounding manner; the interface of the water outlet hole which is communicated with the water cavity is positioned right below the lower movable iron core, and the interface is called as a lower interface;

the bottom end of the lower movable iron core is connected with a lower sphere, and the middle lower part of the lower sphere protrudes downwards out of the lower movable iron core; a lower step hole is formed in the center of the upper part of the lower movable iron core, and a lower reset spring is arranged between the lower step hole and the fixed iron core in a pressing mode;

the bottom surface of the annular boss is downwards matched with the lower return spring in a jacking and pressing way;

two opposite side surfaces of the upper movable iron core below the lower step hole are respectively provided with a lower water passing step in a recessed manner, and the lower water passing step and the central tube enclose a lower water passing cavity; a lower water through hole for communicating the lower water through cavity and the lower step hole is formed in the lower movable iron core at the top of the lower water through step;

when the coil is in power failure, the lower reset spring presses the lower ball body on the lower connector through the lower movable iron core and seals the lower connector, and the water inlet hole is isolated from the water outlet hole in the state;

when the coil is electrified, the lower movable iron core upwards compresses the lower reset spring to enable the lower ball body to upwards leave the lower connector, and in the state, the water inlet hole and the water outlet hole are communicated through the upper water passing cavity, the upper water passing hole, the upper step hole, the water passing hole, the lower step hole, the lower water passing hole and the lower water passing cavity.

More than two air inlet holes and water discharge inlet holes are respectively arranged.

A horizontal connecting seat is integrally arranged on the upper valve body and is used for being connected with a filter, and a connecting hole is formed in the connecting seat;

the last valve body of connecting seat top is for being used for inserting the portion of inserting of the mounting hole that corresponds the setting on the filter, and annular installation seal groove has been seted up on the circumferential surface of portion of inserting, is equipped with the installation department sealing washer in the installation seal groove.

The utility model discloses have following advantage:

the utility model provides an automatic drainage device for a filter negative pressure system, which has double channels of an air channel and a water channel, and solves the problem that drainage can not be carried out under the negative pressure condition (the fuel filter is in a negative pressure state when working normally) (the drainage is carried out when the engine is closed and the negative pressure state is removed in the past); the device adopts the double-control valve core, has small volume and convenient installation, and is a universal part which can be widely popularized and used in a fuel filter used in a negative pressure system; the automatic drainage device is particularly suitable for realizing automatic drainage of a vehicle type with a compact engine arrangement, and solves the problems that manual drainage is difficult and untimely to disassemble and assemble, and the personnel and clothes are polluted by oil stains due to manual drainage.

When the filter works normally, the water collecting cup is in a negative pressure state, and water cannot be drained normally even if the drain valve is opened. Adopt the utility model discloses, can turn on gas circuit and water route simultaneously through control coil electricity, solve the problem of cup that catchments at the unable normal drainage of filter during operation to need not personnel to unscrew plug to the vehicle bottom is manual, and it is very convenient to use.

The upper sealing ring and the lower sealing ring ensure that the coil is isolated from the water path and the air path under any condition.

The double-control valve core has reliable structure action, is convenient to switch on the gas circuit water path or switch off the gas circuit water path simultaneously by controlling the power-on state and the power-off state of the coil, and realizes water drainage in a negative pressure state when the gas circuit water path is switched on simultaneously; and stopping water drainage when the gas path water path is turned off. The utility model discloses can realize that gas circuit and water route accept simultaneously or block, its concrete structure has also guaranteed reliability and the leakproofness of long-term use in the vibration environment (the vehicle has the vibration when traveling).

The winding direction of the part of the coil 11 above the fixed iron core is opposite to that of the part of the coil below the fixed iron core, so that one coil synchronously drives the upper movable iron core 16 and the lower movable iron core 17, and the gas circuit and the water circuit are simultaneously communicated at the double-control valve core when the coil is electrified; when the coils are in power failure, the air path and the water path are simultaneously blocked at the double-control valve core, and two coils do not need to be arranged to respectively control the upper movable iron core 16 and the lower movable iron core 17, so that the synchronism of the actions of the upper movable iron core 16 and the lower movable iron core 17 is improved, the structural complexity is reduced, the manufacturing cost is saved, and the reduction of the product volume is facilitated.

Drawings

Fig. 1 is a schematic view of a vertical sectional structure of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is a schematic view of a vertical cross-section structure at another angle of the present invention for showing the gas path;

fig. 4 is a schematic view of a vertical cross-section structure at a third angle of the present invention, which is used to express a water path;

FIG. 5 is an enlarged view at B in FIG. 4;

fig. 6 is a schematic perspective view of the present invention;

FIG. 7 is a schematic diagram of a dual control valve cartridge;

FIG. 8 is a top view of FIG. 7;

fig. 9 is a schematic perspective view of the dual control valve cartridge.

Detailed Description

As shown in fig. 1 to 9, the automatic drainage device for a negative pressure system of a filter of the present invention comprises an upper valve body 1, a cylindrical housing 2 and a lower valve body 3 which are sequentially connected from top to bottom, wherein the upper valve body 1 and the cylindrical housing 2 can be either separately arranged and screwed or welded together or integrally arranged; the lower valve body 3 is in threaded connection or welded with the cylindrical shell 2, and the upper valve body 1, the cylindrical shell 2 and the lower valve body 3 enclose a valve cavity;

a vertically arranged central tube 4 is arranged in the valve cavity, a horizontal upper end cover 5 is arranged at the upper end of the central tube 4 in a radially extending manner, a horizontal lower end cover 6 is arranged at the lower end of the central tube 4 in a radially extending manner, the upper end cover 5 is in sealing fit with the top of the inner wall of the cylindrical shell 2, and the lower end cover 6 is in sealing fit with the bottom of the inner wall of the cylindrical shell 2;

an air inlet hole 7 communicated with the environment and an air outlet hole 8 upwards communicated with a water collecting cup of the filter are arranged in the upper valve body 1;

a water discharge inlet hole 9 which is communicated with a filter water collecting cup upwards is arranged in the upper valve body 1, and a water discharge outlet hole 10 which is communicated with the environment downwards is arranged in the lower valve body 3; the air outlet 8 and the water outlet 9 are both vertical through holes arranged in the upper valve body 1, the total number of the air outlet and the water outlet is more than two, and the number of the air outlet and the water outlet is four as shown in fig. 6, so that air ventilation and water drainage can be smoothly performed. The air outlet hole 8 and the water outlet hole 9 do not need to be strictly distinguished from each other, and vertical through holes in the same upper valve body 1 can be simultaneously ventilated and drained.

The central tube 4, the upper end cover 5, the lower end cover 6 and the inner wall of the cylindrical shell 2 enclose an annular cavity, a coil 11 is arranged in the annular cavity, and the coil 11 is used for being connected with a vehicle-mounted ECU through a vehicle-mounted circuit;

a double-control valve core is arranged in the central pipe 4, an air inlet hole 7 and an air outlet hole 8 form an air path passing through the double-control valve core, and a water outlet hole 9 and a water outlet hole 10 form a water path passing through the double-control valve core;

the air inlet hole 7 and the air outlet hole 8 are communicated or separated by a double-control valve core, and the water discharge inlet hole 9 and the water discharge outlet hole 10 are communicated or separated by a double-control valve core;

when the coil 11 is electrified, the air passage and the water passage are communicated at the double-control valve core at the same time; when the coil 11 loses power, the air path and the water path are blocked at the double-control valve core at the same time.

When the filter works normally, the water collecting cup is in a negative pressure state, and water cannot be drained normally even if the drain valve is opened. Adopt the utility model discloses, can get electricity through control coil 11 and switch on gas circuit and water route simultaneously, solve the problem of collecting the water cup at the unable normal drainage of filter during operation to need not personnel to unscrew plug to the vehicle bottom is manual, and it is very convenient to use.

An upper sealing groove is formed in the circumferential surface of the upper end cover 5, an annular upper sealing ring 12 is arranged in the upper sealing groove, and the upper sealing ring 12 is in compression joint with the inner wall of the cylindrical shell 2;

the lower surface of the lower end cover 6 is provided with a bottom groove 29 in a downward protruding mode, a lower sealing ring 13 is arranged in the bottom groove 29, and the lower sealing ring 13 is in pressure connection with a convex ring 14, protruding into the bottom groove 29, of the top surface of the lower valve body 3. The upper and lower seals 12, 13 ensure that the coil 11 is isolated from the water and air passages in any event.

The double-control valve core comprises a fixed iron core 15 which is embedded in the middle of the central tube 4 in the up-down direction, an upper movable iron core 16 is arranged in the central tube 4 above the fixed iron core 15, and a lower movable iron core 17 is arranged in the central tube 4 below the fixed iron core 15; the (electromagnetic) coil 11 is characterized in that: the directions of the electromagnetic forces generated at the two ends of the coil 11 are the same in the electrified state, the winding directions at the two ends of the coil 11 are opposite, and the winding turns at the two ends of the coil 11 are the same or distributed according to requirements. Specifically, the winding direction of the part of the coil 11 above the fixed iron core 15 is opposite to the winding direction of the part of the coil below the fixed iron core 15, so that one coil synchronously drives the upper movable iron core 16 and the lower movable iron core 17, and the gas circuit and the water circuit are simultaneously communicated at the double control valve core when the coil is electrified; when the coil loses power, the air circuit and the water circuit are simultaneously blocked at the double-control valve core, and the two coils are not needed to be arranged to respectively control the upper movable iron core 16 and the lower movable iron core 17, so that the action synchronism of the upper movable iron core 16 and the lower movable iron core 17 is improved, the structural complexity is also reduced, and the manufacturing cost is saved.

The top surface of the upper end cover 5 is provided with a groove with an upward opening, and the groove and the upper valve body 1 above the groove form a water and air passing cavity 18; the water and air passing cavity 18 is respectively communicated with the air inlet hole 7 and the air outlet hole 8;

the interface of the air inlet hole 7 communicated with the water-through ventilation cavity 18 is positioned right above the upper movable iron core 16 and is called as an upper interface 22;

the top end of the upper movable iron core 16 is connected with an upper sphere 19, and the middle upper part of the upper sphere 19 protrudes upwards out of the upper movable iron core 16; the upper port 22 is flared to match the upper sphere 19. An upper step hole 25 is arranged at the center of the lower part of the upper movable iron core 16, and an upper return spring 21 is arranged between the upper step hole 25 and the fixed iron core 15 in a pressing way; when the coil 11 is de-energized, the upper reset spring 21 presses the upper ball 19 against the upper connector 22 through the upper movable iron core 16 and closes the upper connector 22, and the air inlet hole 7 is isolated from the air outlet hole 8 in this state;

when the coil 11 is electrified, the upper movable iron core 16 compresses the upper return spring 21 downwards to enable the upper ball 19 to leave the upper interface 22 downwards, and in the state, the air inlet hole 7 is communicated with the air outlet hole 8 through the water and air through cavity 18;

a through water hole 23 is formed in the center of the fixed iron core 15, an annular boss 24 is arranged on the water hole 23 at the upper middle part and the lower middle part in an inward radial protruding mode, and the top surface of the annular boss 24 is upwards matched with the upper reset spring 21 in a pressing mode;

the two opposite side surfaces of the upper movable iron core 16 above the upper step hole 25 are respectively provided with an upper water passing step 35 in a concave manner, and the upper water passing step 35 and the inner wall of the central tube 4 enclose an upper water passing cavity 26; an upper water through hole 27 for communicating the upper water through cavity 26 with the upper step hole 25 is formed in the upper movable iron core 16 at the bottom of the upper water through step 35; the upper water passage hole 27 includes a horizontal portion communicating with the upper water passing chamber 26 and a vertical portion communicating with the upper stepped hole 25, which communicate with each other.

The part of the bottom groove 29 in the convex ring 14 and the lower valve body 3 below the bottom groove enclose a water through cavity 28;

the interface of the water outlet hole 10 communicated with the water cavity 28 upwards is positioned right below the lower movable iron core 17 and is called as a lower interface 30;

the bottom end of the lower movable iron core 17 is connected with a lower sphere 20, and the middle lower part of the lower sphere 20 protrudes downwards out of the lower movable iron core 17; a lower step hole 31 is arranged at the center of the upper part of the lower movable iron core 17, and a lower return spring 32 is arranged between the lower step hole 31 and the fixed iron core 15 in a pressing way; the lower port 30 is flared to match the lower ball 20.

The bottom surface of the annular boss 24 is downwards pressed and matched with the lower return spring 32;

the opposite two side surfaces of the upper movable iron core 16 below the lower step hole 31 are respectively provided with a lower water passing step 33 in a recessed manner, and the lower water passing step 33 and the central tube 4 form a lower water passing cavity 34 in an enclosing manner; a lower water through hole 36 for communicating the lower water through cavity 34 with the lower step hole 31 is formed on the lower movable iron core 17 at the top of the lower water through step 33;

when the coil 11 is powered off, the lower reset spring 32 presses the lower ball body 20 on the lower connector 30 through the lower movable iron core 17 and seals the lower connector 30, and the lower water inlet hole 9 is isolated from the water outlet hole 10 in the state;

when the coil 11 is powered on, the lower movable iron core 17 compresses the lower return spring 32 upwards to enable the lower ball 20 to leave the lower connector 30 upwards, and in the state, the lower water inlet hole 9 is communicated with the water outlet hole 10 through the upper water passing cavity 26, the upper water passing hole 27, the upper stepped hole 25, the water passing hole 23, the lower stepped hole 31, the lower water passing hole 36 and the lower water passing cavity 34.

The specific structure of the double-control valve core is reliable in action, so that the gas circuit water path is switched on or switched off at the same time conveniently through controlling the power-on state and the power-off state of the coil 11, and water is discharged in a negative pressure state when the gas circuit water path is switched on at the same time; and meanwhile, stopping discharging water when the gas circuit waterway is turned off.

More than two air inlet holes 7 and water discharge inlet holes 9 are respectively arranged. In this embodiment, there are two air inlet holes 7, and the air outlet hole 8 and the water outlet hole 9 are all through holes penetrating the upper valve body 1 from top to bottom and are four in number.

A horizontal connecting seat 37 is integrally arranged on the upper valve body 1, the connecting seat 37 is used for being connected with a filter, and a connecting hole 38 is arranged on the connecting seat 37;

the upper valve body 1 above the connecting seat 37 is an insertion part for inserting into a corresponding mounting hole (the mounting hole is communicated with a water collecting cup of the filter) arranged on the filter, an annular mounting sealing groove is formed in the circumferential surface of the insertion part, and a mounting part sealing ring 39 is arranged in the mounting sealing groove.

The utility model discloses when using, trigger the drainage and can have several kinds of alternatives or the parallel condition simultaneously. After the drainage is triggered, the coil 11 is electrified, the air circuit and the water circuit are simultaneously conducted, ambient air enters the water collecting cup through the air circuit under the action of atmospheric pressure, water in the water collecting cup can flow out downwards, the principle of the water collecting cup is similar to that of infusion in a hospital, an infusion bottle is communicated with atmosphere through the air circuit and is connected with a human body through the water circuit, and the water cannot flow out of the air circuit.

The triggering drainage conditions are as follows: a driver directly controls the coil 11 to be electrified through the vehicle-mounted ECU so as to discharge water; the advantage of triggering the drainage condition one is that the drainage can be carried out at any time, and the drainage can be carried out after the drainage occasion is manually selected, so that the pollution to the environment which is not suitable for drainage is avoided; and people do not need to go to the bottom of the vehicle to open the plug, which is very convenient. The disadvantage is that the driver needs to remember to hang the drainage items.

The second triggering drainage condition is as follows: the coil 11 is periodically energized (e.g., once per week) by the onboard ECU to periodically drain. The second drainage condition triggering has the advantages of being simple and easy to operate (like setting an alarm clock), and avoiding the need of excessively recording drainage items by a driver. The disadvantages are that no manual selection of drainage occasions is made, and the drainage period is set based on the average use condition of the vehicle, and the specific use condition of the vehicle in a specific time period is not considered (for example, the vehicle is not driven at all in a period of time, and drainage is not needed).

The third triggering drainage condition is as follows: after a water level sensor in the water collecting cup of the filter detects that the water level reaches or exceeds a preset water level, the vehicle-mounted ECU controls the coil 11 to be electrified according to a detection signal of the water level sensor so as to discharge water. The advantage is that drainage timeliness is high, need not personnel's operation, and the shortcoming is that does not have artifical selection drainage occasion.

The three triggering drainage conditions can be selected to be performed, and can also be parallel conditions which are performed simultaneously, namely, drainage is triggered after any one triggering condition is performed. Preferably, as the parallel condition, when the driver does not forget, the coil 11 may be energized to drain water after selecting an appropriate drainage occasion and timing manually. When the careless leakage of personnel is strengthened, a second condition and a third condition of triggering drainage are used as supplements.

The above embodiments are only used for illustrating but not limiting the technical solutions of the present invention, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the invention, which should be construed as being limited only by the claims.

Claims (5)

1. The automatic drainage device for the negative pressure system of the filter comprises an upper valve body, a cylindrical shell and a lower valve body which are sequentially connected from top to bottom, wherein the lower valve body is screwed or welded with the cylindrical shell, and the upper valve body, the cylindrical shell and the lower valve body enclose a valve cavity;

the method is characterized in that: a vertically arranged central tube is arranged in the valve cavity, a horizontal upper end cover is arranged at the upper end of the central tube in a radially extending manner, a horizontal lower end cover is arranged at the lower end of the central tube in a radially extending manner, the upper end cover is in sealing fit with the top of the inner wall of the cylindrical shell, and the lower end cover is in sealing fit with the bottom of the inner wall of the cylindrical shell;

an air inlet hole communicated with the environment and an air outlet hole upwards communicated with a water collecting cup of the filter are formed in the upper valve body;

a water discharge inlet hole which is communicated with the filter water collecting cup upwards is arranged in the upper valve body, and a water discharge outlet hole which is communicated with the environment downwards is arranged in the lower valve body;

the central tube, the upper end cover, the lower end cover and the inner wall of the cylindrical shell form an annular cavity, a coil is arranged in the annular cavity and is used for being connected with the vehicle-mounted ECU through a vehicle-mounted circuit;

a double-control valve core is arranged in the central tube, an air inlet hole and an air outlet hole form an air path passing through the double-control valve core, and a water outlet hole form a water path passing through the double-control valve core;

when the coil is electrified, the air passage and the water passage are communicated at the position of the double-control valve core at the same time; when the coil loses power, the air passage and the water passage are blocked at the double-control valve core at the same time.

2. The automatic drain device for a negative pressure filter system according to claim 1, wherein: an upper sealing groove is formed in the circumferential surface of the upper end cover, an annular upper sealing ring is arranged in the upper sealing groove, and the upper sealing ring is in compression joint with the inner wall of the cylindrical shell;

the lower surface of the lower end cover is provided with a bottom groove in a downward protruding mode, a lower sealing ring is arranged in the bottom groove, and the lower sealing ring is in pressure connection with a convex ring protruding into the bottom groove upwards from the top surface of the lower valve body.

3. The automatic drain device for a negative pressure filter system according to claim 1 or 2, characterized in that: the double-control valve element comprises a fixed iron core embedded in the middle of the central tube in the vertical direction, an upper movable iron core is arranged in the central tube above the fixed iron core, and a lower movable iron core is arranged in the central tube below the fixed iron core;

the winding direction of the part of the coil above the fixed iron core is opposite to the winding direction of the part of the coil below the fixed iron core;

the top surface of the upper end cover is provided with a groove with an upward opening, and the groove and the upper valve body above the groove form a water-through ventilation cavity in an enclosing manner; the water and air passing cavity is respectively communicated with the air inlet hole and the air outlet hole;

the interface of the air inlet hole communicated with the water-through ventilation cavity is positioned right above the upper movable iron core and is called as an upper interface;

the top end of the upper movable iron core is connected with an upper sphere, and the middle upper part of the upper sphere protrudes upwards out of the upper movable iron core; an upper step hole is arranged in the center of the lower part of the upper movable iron core, and an upper reset spring is arranged between the upper step hole and the fixed iron core in a pressing way; when the coil is in power failure, the upper reset spring presses the upper ball body on the upper connector through the upper movable iron core and seals the upper connector, and the air inlet hole is isolated from the air outlet hole in the state;

when the coil is electrified, the upper movable iron core compresses the upper return spring downwards to enable the upper ball body to leave the upper interface downwards, and the air inlet is communicated with the air outlet through the water-through ventilation cavity in the state;

the center of the fixed iron core is provided with an upper through water passing hole and a lower through water passing hole, the water passing hole is provided with an annular boss which is inwards and radially protruded at the upper middle part and the lower middle part, and the top surface of the annular boss is upwards matched with the upper reset spring in a jacking manner;

the two opposite side surfaces of the upper movable iron core above the upper step hole are respectively provided with an upper water passing step in a concave manner, and an upper water passing cavity is defined by the upper water passing step and the central tube; an upper water through hole communicated with the upper water passing cavity and the upper step hole is formed in the upper movable iron core at the bottom of the upper water passing step;

the part of the bottom groove in the convex ring and the lower valve body below the bottom groove form a water through cavity in a surrounding manner; the interface of the water outlet hole which is communicated with the water cavity is positioned right below the lower movable iron core, and the interface is called as a lower interface;

the bottom end of the lower movable iron core is connected with a lower sphere, and the middle lower part of the lower sphere protrudes downwards out of the lower movable iron core; a lower step hole is formed in the center of the upper part of the lower movable iron core, and a lower reset spring is arranged between the lower step hole and the fixed iron core in a pressing mode;

the bottom surface of the annular boss is downwards matched with the lower return spring in a jacking and pressing way;

two opposite side surfaces of the upper movable iron core below the lower step hole are respectively provided with a lower water passing step in a recessed manner, and the lower water passing step and the central tube enclose a lower water passing cavity; a lower water through hole for communicating the lower water passing cavity with the lower step hole is formed in the lower movable iron core at the top of the lower water passing step;

when the coil is in power failure, the lower reset spring presses the lower ball body on the lower connector through the lower movable iron core and seals the lower connector, and the water inlet hole is isolated from the water outlet hole in the state;

when the coil is electrified, the lower movable iron core upwards compresses the lower reset spring to enable the lower ball body to upwards leave the lower connector, and in the state, the water inlet hole and the water outlet hole are communicated through the upper water passing cavity, the upper water passing hole, the upper step hole, the water passing hole, the lower step hole, the lower water passing hole and the lower water passing cavity.

4. The automatic drain device for a filter negative pressure system according to claim 1 or 2, characterized in that: more than two air inlet holes and water discharge inlet holes are respectively arranged.

5. The automatic drain device for a negative pressure filter system according to claim 1 or 2, characterized in that: a horizontal connecting seat is integrally arranged on the upper valve body and is used for being connected with a filter, and a connecting hole is formed in the connecting seat;

the last valve body of connecting seat top is for being used for inserting the portion of inserting of the mounting hole that corresponds the setting on the filter, and annular installation seal groove has been seted up on the circumferential surface of portion of inserting, is equipped with the installation department sealing washer in the installation seal groove.

Images