JPH1078216A - Electromagnetic pump with safety valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a space by minimizing the number of components of a branch section and reducing the bulk in the height direction and prevent the stability of a flow rate of a liquid fuel from being degraded by an air accumulated area. SOLUTION: Since hollow sections 63 and 63a, which constitute a branch passage inside a joint 61 as a branch section, penetrating in the longitudinal direction, are laid out in the shape of a crossroad in the rectangular direction of the discharge direction of a liquid fuel discharged from a discharge hole 32 on the upper end of an electromagnetic pump, the hollow sections 63 and 63a of the joint 61 can be constituted with one component for shorter structure. Especially, the bulk in the height direction is arranged to be reduced dramatically while the hollow sections 63a can be arranged to be shorter, which makes it possible to reduce an air accumulated area in the structure and inhibit the amount of fluctuation air at the hollow section 63a resultant from the air accumulated area and prevent the stability of a flow rate of liquid fuel from being degraded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to heating or hot water supply,
The present invention relates to an electromagnetic pump with a safety valve, which is used in various types of cooking combustion devices and supplies liquid fuel such as white kerosene to, for example, a consumer oil burner.

[0002]

2. Description of the Related Art Heretofore, an electromagnetic pump with a safety valve has been used to burn fuel by supplying a fuel to a combustion portion of a combustion device such as an oil combustor through a vaporizer and a vaporized fuel spray nozzle.
When burned for many years, tar adheres and accumulates in these vaporizers, vaporized fuel spray nozzles, nozzle openings, and the like. As a result, if the pressure inside the vaporizer rises abnormally, there is a risk that the vaporizer itself will burst.Therefore, a branch is provided in the piping between the electromagnetic pump and the vaporizer, and the pressure inside the vaporizer becomes higher than a predetermined pressure. Then, a safety valve that opens through a branch of the pipe is provided at the branch. Such an electromagnetic pump with a safety valve will be described with reference to FIG.

FIG. 5 is a front view showing a sectional structure of a main part of a conventional electromagnetic pump with a safety valve. In FIG. 5, a hollow male screw portion 83 which can be screwed with a female screw portion formed on the side surface of the joint 82 is formed at one end of the joint 81, and a hollow portion 84 is formed at the other end. A female screw portion 87 that can be screwed with a male screw portion 86 on one end side of the joint 85 having the shape is formed. Between the hollow male screw portion 83 and the female screw portion 87 of the joint 81, a hollow hole 88 having a predetermined inner diameter larger than the hollow hole of the male screw portion 86 and a little smaller than the inner diameter of the female screw portion 87 is formed. ing. In this hollow hole 88, a safety valve 8 that opens when the pressure in a carburetor (not shown) exceeds a predetermined pressure in a state where the male screw portion 86 of the joint 85 is screwed into the female screw portion 87.
9 are provided. The safety valve 89 has a hollow valve seat 9.
In a state where the valve 91 is urged by the spring 92 to the opening of the valve seat 9
It is configured so that the opening of No. 0 can be opened and closed. The joints 81 and 85 to which the safety valve 89 is attached are connected to the hollow portion 9.
The joint 82 can be screwed to and fixed to the side surface of the joint 82 having the third portion 3. The hollow portion 93 of the joint 82 communicates with the hollow hole 88 and the hollow portion 84.

[0004] At the upper end of the joint 82, there is formed a hollow male screw 94 which can be screwed with a female screw of a pipe communicating with a carburetor (not shown). A hole portion 99 which accommodates a discharge joint 97 of an electromagnetic pump 96 having a discharge port 95 and in which a female screw portion engageable with a male screw portion 98 of the discharge joint 97 is formed.
Are formed. In the hole 99 of the joint 82, the O-ring 100 fitted to the discharge joint 97 thereof
The discharge port 95 of the electromagnetic pump 96 and the hollow portion 9
3 sealability is secured.

In this way, the discharge joint 97 of the electromagnetic pump 96 whose flow rate has been adjusted and the joint 82 in which the joint 81 with the safety valve 89 mounted is fixed to the side are fixed. It communicates with a vaporizer (not shown) through a hollow portion 93 of the joint 82, and communicates with the hollow portion 84 of the joint 85 through a safety valve 89 from the hollow portion 93 at an internal pressure higher than a predetermined pressure. .

[0006]

In the above-mentioned conventional configuration,
The joints 81, 82, and 85 have a large number of parts to form the branch portion, and an air pool is formed at a connection portion (hollow portion 84a) on the side of the safety valve 89 in the liquid fuel supply passage. Cavitation occurs due to the inflow and outflow of the air, and the flow rate stability of the liquid fuel is deteriorated. Further, since the joint 82 connected to the electromagnetic pump 95 arranged in the vertical direction is arranged in the vertical direction, the bulk increases in the height direction,
There was a problem that a space for accommodating it was required.

The present invention solves the above-mentioned conventional problems. The number of parts at the branch portion is small, the volume is reduced in the height direction to save space, and the stability of the flow rate of the liquid fuel due to the air pool is reduced. An object is to provide an electromagnetic pump with a safety valve that can prevent deterioration.

[0008]

In the electromagnetic pump with a safety valve according to the present invention, a branch portion is provided on a discharge port side for discharging the liquid fuel, and the liquid fuel is supplied to the combustion portion via one side of the branch portion. In addition, in an electromagnetic pump with a safety valve provided on the other side of the branch portion with a safety valve that opens when the internal pressure of the branch portion exceeds a predetermined pressure, the branch path of the branch portion discharges liquid fuel from a discharge port. The direction is characterized by being disposed in a direction intersecting. More specifically, in the electromagnetic pump with a safety valve of the present invention, a plunger having a downstream end opened and a suction check valve provided at an upstream end is biased from both upstream and downstream sides. The plunger is disposed in the cylinder while being balanced and supported by means, and the plunger is moved forward to the top dead center on the downstream side by the control current supplied to the electromagnetic coil, and the plunger is returned to the bottom dead center on the upstream side by the biasing means. The liquid fuel sucked inside is opened at the time of return, and the discharge check valve is opened at the time of forward movement to discharge the liquid fuel from the discharge port. A branch section is provided, and a liquid fuel is supplied to the combustion section via one side of the branch section, and a safety valve that opens when the internal pressure of the branch section exceeds a predetermined pressure is provided on the other side of the branch section. In the electromagnetic pump with a safety valve, The discharge direction of the liquid fuel in the branch path from the discharge port of the branching portion is characterized in that it is arranged perpendicular.

With this configuration, the branch path of the branch section is disposed in a direction intersecting with the direction in which the liquid fuel is discharged from the discharge port. Therefore, the branch path of the branch section can be formed in the height direction with a small number of components. This makes it possible to reduce the height of the airbag, and it is possible to reduce the amount of air trapped at the branch part. Since the amount of air is suppressed, deterioration of the stability of the flow rate of the liquid fuel is prevented. In addition, if the branch path of the branch portion is disposed in a direction orthogonal to the direction in which the liquid fuel is discharged from the discharge port, the bulk in the height direction becomes smaller, and fluctuations in the branch path due to air pools. The amount of air is further suppressed, and the deterioration of the flow rate stability of the liquid fuel is prevented.

Preferably, in the electromagnetic pump with a safety valve of the present invention, the position of the safety valve in the branch path of the branch portion is a position near the branch point.

According to this configuration, if the position of the safety valve in the branch path of the branch portion is in the vicinity of the branch point, the air pool is reduced, and the amount of air fluctuation in the branch path due to the air pool is further reduced. In addition, the deterioration of the stability of the flow rate of the liquid fuel is further prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electromagnetic pump with a safety valve according to the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a combustion apparatus having an electromagnetic pump with a safety valve according to an embodiment of the present invention.

In FIG. 1, a combustion device such as an oil stove includes a refueling cartridge 1, a fuel tank 2 in which a liquid fuel F is supplied from the cartridge 1 and stored therein, and a liquid fuel in the fuel tank 2. An electromagnetic pump 4 that discharges and supplies the liquid fuel F from a discharge port at the upper end with the suction port of the suction cylinder 3 positioned inside the F. A discharge port and one end of the electromagnetic pump 4 are connected, and a fuel supply flow path and The other end is T so that the branch path composed of the fuel return flow path is horizontal.
The other end of the branch (right side)
Is a safety valve that opens when the internal pressure exceeds a predetermined pressure.
Is connected to the fuel tank 2 through the joint and the other (left side) of the branched other end of the joint with safety valve 6 via a pipe. A vaporizer 9 for vaporizing the liquid fuel F supplied through the nozzle and ejecting atomized fuel from the vaporized fuel spray nozzle 8; a solenoid device 10 for cleaning the nozzle opening of the vaporized fuel spray nozzle 8; A drive control pulse as a control current is supplied to a combustor 11 disposed opposite to a nozzle port of the spray nozzle 8 and combusting vaporized fuel injected from the nozzle port, and a control current to the electromagnetic coil of the electromagnetic pump 4. The fuel F is controlled so as to be supplied to the vaporizer 9 and the combustor 11 at a constant rate, the temperature of the heater 7 of the vaporizer 9 is controlled, the nozzle opening is controlled by the solenoid device 10, and the combustion is further performed. And 11 combustion control unit 12 that performs such combustion control, such as ignition or extinguishing is provided. The electromagnetic pump 4 and the joint section 6 with a safety valve constitute an electromagnetic pump 13 with a safety valve.

FIG. 2 is an enlarged view showing a schematic sectional configuration of the carburetor 9 and the solenoid device 10 of FIG.

In FIG. 2, a heater 7 is provided on the outer peripheral portion of the vaporizing tube of the vaporizer 9, and a temperature is detected on the outer peripheral portion of the vaporizing tube opposite to the position where the heater 7 is provided. A thermistor 14 as a temperature sensor is provided, and a combustion control unit 12 to which the thermistor 14 and the heater 7 are connected.
The temperature of the heater 7 is controlled to a predetermined temperature. In addition, a hollow porous body 16 is provided in the vaporization chamber 15 inside the vaporization pipe of the vaporizer 9 so that the liquid fuel is heated by the heater 7 and vaporized easily. This vaporizer 9
The upper end of the vaporization chamber 15 communicates with the nozzle port side of the vaporized fuel spray nozzle 8 disposed in the horizontal direction.

A needle rod 18 at the end of a valve rod 17 horizontally disposed in the vaporized fuel spray nozzle 8 is configured to eliminate clogging due to tar or the like at the nozzle port. That is, the magnetic body 19 connected to the valve rod 17 together with the movable valve rod 17 causes the needle valve 18 at the tip of the valve rod 17 to move inward from the nozzle port by the urging force of the spring 20 when the solenoid device 10 is not energized. When the solenoid device 10 is energized, the magnetic body 19 is attracted to the attraction wall 21 against the urging force of the spring 20, and the needle valve 18 projects outward from the nozzle port. State. Also,
In the vaporized fuel spray nozzle 8, a return valve 22 is divided into two spaces on the nozzle opening side and the opposite side,
One end of the return pipe 23 is opened in the vaporized fuel spray nozzle 8 on the opposite side, and the other end of the return pipe 23 is opened in the fuel tank 2.

FIG. 3 is a longitudinal sectional view showing the structure of the electromagnetic pump 4 of FIG.

In FIG. 3, the electromagnetic pump 4 includes a cylindrical cylinder 31, a discharge joint 33 provided above the cylinder 31 as a cylindrical member and having a discharge port 32 at an upper end, and a cylinder 31. And a suction cylinder 3 having a suction port 34 at a lower end thereof. The discharge joint 33, the cylinder 31, and the suction cylinder 3 are integrally connected to form a tubular body that extends from the suction port 34 to the discharge port 32 through the inside of the cylinder 31. A filter 36 for removing dust and the like from the liquid fuel is provided on the suction port 34 side of the suction cylinder 3.

A plunger body 37 having a fluid passage is provided in the cylinder 31. A reversing spring 38 as an urging means is provided above the plunger body 37. Further, the opening of the suction valve seat 39 can be opened and closed in a fluid passage in the plunger body 37 in a state where the spherical suction valve 40 is lightly urged to the suction valve seat 39 by a spring 41 as urging means. Is provided. Further, on the upstream side of the suction-side check valve, a shut-off valve 42 for preventing backflow to the lower fuel tank side during the pump stop period is provided integrally with the plunger body 37 and the suction-side check valve. I have. The opening of the suction valve seat 39 communicates with the inside of the cylinder 31 via a liquid fuel passage 39a to form a fluid passage. The plunger body 37 described above,
The suction-side check valve and the shut-off valve 42 constitute a plunger as a free piston-like plug-like member having a fluid passage, and reciprocate up and down in the cylinder 31 between a top dead center and a bottom dead center. ing.

The suction cylinder 3 upstream of the shut-off valve 42
, A closing valve seat 43 is fixedly provided. In order to enhance the close contact between the closing valve 42 and the closing valve seat 43 in the closed state, the elastic hardness of at least one of the closing valve 42 and the closing valve seat 43 is reduced and softened, and the closing valve 42 and the closing valve 42 are closed. The area of the contact surface when the closing valve seat 43 is closed is made as small as possible so that the other contact surface may bite or collapse on one side.

Further, a discharge side check valve is provided in the discharge joint 33 so that the opening of the discharge valve seat 44 can be opened and closed while the discharge valve 45 is lightly urged by the spring 46 to the discharge valve seat 44. Is provided.

Further, a coil bobbin 47 is provided on an outer peripheral portion of the cylinder 31, and an electromagnetic coil 48 for generating an electromagnetic force is provided on the coil bobbin 47. Magnetic pole members 49 and 50 are disposed inside the coil bobbin 47, and a yoke 51 as a magnetic path member that forms a magnetic path with the magnetic pole members 49 and 50 is disposed outside the coil bobbin 47 and the electromagnetic coil 48. ing.
A terminal board 52 is provided on the coil bobbin 47. Both ends of an electromagnetic coil 48 are connected to the terminal plate 52, and the combustion control unit 12 supplies the electromagnetic coil 48 via the terminal plate 52 to the closing valve 42, which is the bottom dead center of the stroke of the plunger 37 during operation. So that no sound is produced when the lower end of the closing valve seat 43 is closed, that is, the closing valve 42 of the closing valve member and the closing point at which the closing valve seat 43 closes are located at the lower end of the closing valve 42 at the bottom dead center of the plunger. A control drive current having a predetermined bias voltage positioned on the upstream side during the pump suction period when the drive pulse is stopped (between each drive pulse) is supplied to the electromagnetic coil 48.

FIG. 4 is a front view showing a sectional structure of the joint section 6 with a safety valve in the electromagnetic pump 13 with a safety valve in FIG.

In FIG. 4, a discharge port 3 is provided at an upper end portion in a connection hole 62 provided at a center position of a lower end of a hollow joint 61 constituting a branch portion whose longitudinal direction is provided horizontally.
2 is configured to house the upper part of the discharge joint 33 of the electromagnetic pump 13 having the female screw part 2 and to form a female screw part that can be screwed with the male screw part of the discharge joint 33. The connection hole 62 of the joint 61 branches to the left and right by communicating with a hollow portion 63 which is a branch path penetrating in the longitudinal direction of the joint 61, and the other end of a supply pipe connected to the vaporizer 9 at one end. A male screw 64 is formed at one end (left side) of the joint 61 so that the male screw 64 can be screwed and connected. Also, the joint 6 is screwed into the other end of the return pipe connected to the fuel tank 2 with one end opened.
A male screw 65 is formed at the other end of the first member 1. further,
In the hollow portion 63 on the right side of the joint 61, a safety valve 5 that opens when the internal pressure becomes 1.2 kg / cm ² or more,
It is provided at a position as close as possible to the connection hole 62 or the branch position a. Thus, the air reservoir in the hollow portion 63a is configured as small as possible, and the flow stability of the liquid fuel by the air reservoir is secured. The safety valve 5 constitutes a check valve. The valve 67 is opened in a state where a spherical valve 67 is urged by a spring 68 toward a valve seat 66 formed in a hollow portion 63 near the connection hole 62. The part can be opened and closed. Further, in the connection hole 62, the discharge joint 33
The O-ring 69 fitted into the hole ensures the sealing performance of the discharge port 32 and the hollow portion 63 of the electromagnetic pump 4. Reference numeral 70 denotes a joint holding / rotating member.

According to the above configuration, first, a control drive signal having a bias voltage is output from the combustion control unit 12 to the electromagnetic coil 48. As a result, the plunger body 37 receives the electromagnetic attraction force, moves upward in the cylinder 31 against the return spring 38, and moves to the top dead center. As a result, the pressure in the plunger body 37 rises, and the suction-side check valve is pressed against the suction valve seat 39 to close, thereby preventing backflow. The bottom surface of the check valve 45 is pressed by the high pressure in the cylinder 31 to open and open the discharge valve 45 against the urging force of the spring 46, thereby discharging the liquid fuel from the discharge port 32 at the upper end. Become.

Next, the electromagnetic coil 4 during the pump forward movement period
Even when the excitation of the pump 8 is completed, the pump is moved backward by the biasing force of the spring 38 while the suction force in the forward direction is applied to the plunger body 37 with a predetermined bias voltage applied to the electromagnetic coil 48. During the period, a return is made from the top dead center to return to another bottom dead center downstream of the initial closing point. In the process of returning to the bottom dead center, the pressure in the plunger body 37 becomes negative pressure, and the suction-side check valve opens the suction valve 40 against the urging force of the spring 41, thereby displacing the liquid fuel with the liquid fuel. In addition to suction through the passage 39a, the discharge-side check valve is closed by the discharge valve 45 being pressed against the discharge valve seat 44 by the negative pressure in the cylinder 31.
It is possible to prevent the backflow of the liquid fuel in the oil feed pipe previously discharged through the discharge side check valve and to suck the liquid fuel in the fuel tank 2 through the suction port 34 and the suction side check valve. it can.

By repeating the above, the fuel tank 2
The liquid fuel sucked from the outlet is discharged from the discharge port 32 of the electromagnetic pump 4.
Is supplied through the connection hole 62 of the joint 61 and the hollow portion 63 into the vaporization chamber 15 of the vaporizer 9, where it is heated to a high temperature and vaporized, and the vaporized fuel spray nozzle 8 supplies the atomized fuel to the combustor 11. Inject and burn. At this time, tar or the like accumulates in the vaporized fuel spray nozzle 8 or in the nozzle port due to long-term combustion, and the valve rod 17 and the needle valve 18 at the tip end become inoperable. It happens that you can't. In this case, there is a risk that the vaporizer 9 itself may burst, but when the pressure in the vaporizer 9 becomes equal to or higher than a predetermined pressure,
The safety valve 5 is opened via the supply pipe and the hollow part 63 of the joint 61 as a branch part, and high pressure in the carburetor 9 is released to the fuel tank 2 via the safety valve 5,
The rupture of the vaporizer 9 itself is prevented.

Here, the joint 6 by the electromagnetic pump 4
In the supply of the liquid fuel through the first connection hole 62 and the hollow portion 63, the hollow portion 63 penetrating in the longitudinal direction forming the branch path in the joint 61 as the branch portion is formed at the discharge port 32 at the upper end of the electromagnetic pump 4. And a hollow portion 63a from the branch position a to the valve seat 66 of the safety valve 5 is disposed in a T-shaped path in a direction perpendicular to the discharge direction of the liquid fuel discharged from the
However, since it is configured to be significantly shorter than the conventional case of FIG. 5, the air accumulation in the hollow portion 63a is reduced. If the air reservoir is large, the air in this portion flows in and out when the liquid fuel is supplied, and cavitation occurs, thereby deteriorating the stability of the flow rate of the liquid fuel. The amount of air can be suppressed, and the deterioration of the stability of the flow rate of the liquid fuel can be prevented.

Conventionally, the branch portion is divided into a large number of joints. However, in the present invention, the branch portion can be made shorter by the hollow portion 63 of one joint 61, and the height direction can be reduced. Can be made much smaller and space can be saved. Further, the number of parts in the branch portion is reduced, which is advantageous in terms of cost.

In the present embodiment, the branch path in the joint 61 is arranged in a direction (horizontal direction) perpendicular to the liquid fuel discharge direction (vertical direction) from the discharge port 32 of the electromagnetic pump 4. Alternatively, a branch path on the fuel supply side in the joint 61 may be arranged in a direction forming a predetermined obtuse angle with the discharge direction (vertical direction) of the liquid fuel from the discharge port 32. May be arranged in a direction crossing the discharge direction (vertical direction) of the liquid fuel from the discharge port 32 of the electromagnetic pump 4. in this way,
By arranging a branch path on the fuel supply side in the joint 61 in a direction forming a predetermined obtuse angle with the discharge direction (vertical direction) of the liquid fuel from the discharge port 32, The discharge direction (vertical direction) is more gently bent, so that the flow of the liquid fuel is more stable.

[0032]

As described above, according to the present invention, the branch path of the branch portion is disposed in a direction crossing the direction in which the liquid fuel is discharged from the discharge port. It can be made shorter, the number of parts can be reduced, the bulk in the height direction can be reduced, and the air pool in the branch path can be made smaller, and the liquid fuel due to the fluctuation of the air amount in the branch path due to the air pool can be reduced. Can be prevented from deteriorating the flow rate stability. In addition, if the branch path of the branch portion is arranged in a direction orthogonal to the direction in which the liquid fuel is discharged from the discharge port, the bulk in the height direction can be further reduced, and the liquid fuel is collected by the air reservoir. Deterioration of flow rate stability can be prevented.

Further, if the position of the safety valve in the branch path of the branch portion is in the vicinity of the branch point, the amount of air pool is reduced, and the amount of fluctuating air in the branch path due to the air pool can be further suppressed. Thus, it is possible to further prevent the deterioration of the stability of the flow rate of the liquid fuel.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a combustion apparatus having an electromagnetic pump with a safety valve according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a schematic sectional configuration of the vaporizer and the solenoid device of FIG.

FIG. 3 is a longitudinal sectional view showing a configuration of the electromagnetic pump of FIG.

FIG. 4 is a front view showing a cross-sectional configuration of a joint portion with a safety valve in the electromagnetic pump with a safety valve in FIG. 1;

FIG. 5 is a front view showing a sectional configuration of a main part of a conventional electromagnetic pump with a safety valve.

[Explanation of symbols]

 Reference Signs List 4 electromagnetic pump 5 safety valve 6 joint part 12 combustion control part 13 electromagnetic pump with safety valve 31 cylinder 32 discharge port 33 discharge joint 37 plunger body 38 return spring 39 suction valve seat 39a liquid fuel passage 40 suction valve 41 spring 42 closing valve 43 closing Valve seat 44 Discharge valve seat 45 Discharge valve 46 Spring 48 Electromagnetic coil 61 Joint 62 Connection hole 63 Hollow part 66 Valve seat 67 Valve 68 Spring

Claims (3)

[Claims] 1. A branch portion is provided on a discharge port side for discharging liquid fuel. Liquid fuel is supplied to a combustion portion via one side of the branch portion, and the branch portion is provided on the other side of the branch portion. In an electromagnetic pump with a safety valve provided with a safety valve that opens when the internal pressure exceeds a predetermined pressure, the branch path of the branch portion is disposed in a direction crossing a discharge direction of the liquid fuel from the discharge port. An electromagnetic pump with a safety valve, which is characterized in that: 2. A plunger having a downstream end open and a suction check valve provided at an upstream end is disposed in the cylinder while being equilibrium supported by urging means from both upstream and downstream sides. Moving the plunger forward to the top dead center on the downstream side by the control current supplied to the electromagnetic coil, and moving the plunger back to the bottom dead center on the upstream side by the urging means; The discharge check valve is opened at the time of forward movement of the liquid check valve opened to discharge the liquid fuel from the discharge port, and a branch portion is provided on the discharge port side. An electromagnetic valve provided with a safety valve that supplies liquid fuel to the combustion unit via one side of the unit and that is provided on the other side of the branch unit with a safety valve that opens when the internal pressure of the branch unit exceeds a predetermined pressure. In the pump, the branch Safety valve with an electromagnetic pump 岐経 path, characterized in that it is arranged in a direction orthogonal to the ejection direction of the liquid fuel from said discharge port. 3. The electromagnetic pump with a safety valve according to claim 1, wherein an arrangement position of the safety valve in a branch path of the branch portion is a position near a branch point.