JP5717876B2 - Flow control device - Google Patents

Description

  The present invention relates to a flow control device in which a plurality of solenoid valves are connected.

  The transpiration gas processing system for automobiles temporarily absorbs the transpiration gas volatilized in the fuel tank into the canister, introduces it into the engine using the negative pressure of the intake manifold, and re-burns it to the outside. Is preventing. The flow rate of the transpiration gas introduced into the engine is controlled by a solenoid valve.

  In recent years, the HEV (Hybrid Electric Vehicle) of automobiles has reduced the frequency of engine operation due to a decrease in the frequency of engine operation. Therefore, increasing the flow rate in the low negative pressure region is an issue. Therefore, conventionally, the parallel connection of electromagnetic valves and the modularization of an external chamber and the like have increased the flow rate while reducing costs by reducing piping and improving workability (for example, Patent Document 1). reference).

International Publication No. WO2008 / 090657 Pamphlet

  When connecting multiple solenoid valves, the structure of the flow path becomes complicated depending on the connection method, and pressure loss occurs, resulting in a significant decrease in flow rate, which makes it difficult to maintain functions (flow rate, etc.). .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a flow rate control device that reduces the cost without reducing the function.

The flow control device according to the present invention includes a chamber, a first port that introduces fluid into the chamber or leads the fluid from the chamber, an open / close passage that communicates the chamber and the first port and is opened and closed by a valve, and a valve. opening and closing the solenoid portion possess respectively, and a plurality of solenoid valves that are integrally connected to each other, communicates the respective chambers to each other of the plurality of solenoid valves, a connection portion for integrating a plurality of solenoid valves, a plurality of formed only in the chamber of any one of the solenoid valves of the solenoid valve, which is constituted in <br/> so that Ru and a second port for introducing or deriving a fluid.

  According to this invention, when a plurality of solenoid valves are connected to increase the flow rate, the same number of first ports communicating with the open / close passage as the solenoid valves are provided, thereby suppressing pressure loss when passing through the open / close passage. It is possible to suppress a decrease in flow rate. Also, by providing only one second port communicating with the chamber regardless of the number of solenoid valves, the number of piping can be reduced and workability can be improved. Therefore, it is possible to provide a flow rate control device that can reduce the cost without lowering the function.

1 is an overall configuration diagram of a transpiration gas processing system to which a flow rate control device according to Embodiment 1 of the present invention is applied. 1 is a front view showing a configuration of a flow control device according to Embodiment 1. FIG. 1 is a cross-sectional view showing a configuration of a flow control device according to Embodiment 1. FIG. It is a graph which shows the flow volume characteristic according to the connection method of a solenoid valve. It is sectional drawing which shows the structure of the conventional flow control apparatus which modularized two solenoid valves. It is sectional drawing which shows the structure of the flow control apparatus which connected two solenoid valves by piping. 2 is an enlarged cross-sectional view of a chamber side of the flow control device according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view showing a configuration in which a filter is installed in the flow control device according to the first embodiment. It is sectional drawing which shows the structure which installed the filter in the flow control apparatus shown in FIG. It is sectional drawing of the flow control apparatus which concerns on Embodiment 1, and shows a solenoid valve single operation state. It is a modification of the flow control apparatus which concerns on Embodiment 1, and is a front view which shows the structure which connected three solenoid valves. It is a modification of the flow control apparatus concerning Embodiment 1, and is a front view which shows the structure which connected the chambers directly. It is sectional drawing of the flow control apparatus shown in FIG. 12, (a) shows the structural example of welding connection, FIG.13 (b) shows the example of a direct connection. 14A and 14B are diagrams illustrating the filter illustrated in FIG. 13, in which FIG. 14A is an enlarged cross-sectional view of the filter, and FIG. 14B is an external perspective view.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
In the transpiration gas treatment system shown in FIG. 1, the transpiration gas generated in the fuel tank 1 is temporarily adsorbed by a device called activated carbon called a canister 2. After the engine 6 is started, combustion occurs when a mixed gas of adsorbed air and vaporized gasoline flows into the engine 6 from the canister 2 due to the negative pressure of the intake manifold 5. At this time, the flow rate control device 3 controls the flow rate of the mixed gas introduced from the canister 2 into the engine 6 according to the drive signal of the control unit 7.

  FIG. 2 is a front view showing the configuration of the flow control device 3, and FIG. This flow control device 3 is a configuration example in which two solenoid valves are combined. The solenoid unit 10a and the chamber 20a constitute one solenoid valve, and the solenoid unit 10b and the chamber 20b constitute one solenoid valve. . The number of input ports (second ports) 8 is one regardless of the number of solenoid valves, and the number of output ports (first ports) 9a, 9b is two, the same as the number of solenoid valves.

  Solenoid parts 10a and 10b that generate a driving force for the plunger 15 serving as a valve to control the flow rate of the vaporized gas are a coil 11 wound with a conducting wire connected to a power supply terminal, and a core that is excited by energizing the coil 11 12, a yoke 13 and a plate 14 that form a magnetic circuit together with the core 12, a plunger 15 that is attracted to the core 12, a spring 16 that biases the plunger 15 in a direction opposite to the suction direction of the core 12, and a plunger 15 And pins 17 serving as stoppers. Further, the gaps in the solenoid portions 10a and 10b are closed by O-rings 18 and 19, respectively.

  The chambers 20a and 20b serving as the passages for the vaporized gas include open / close passages 21a and 21b that block the flow of the vaporized gas by the movement of the plunger 15 and caps 22 that block the openings on the bottom side of the chambers 20a and 20b. . More specifically, the open / close passages 21a and 21b have a shape like a double cylinder, and are opened and closed when the upper end portion of the inner cylinder comes into contact with or separates from the plunger 15. As shown by an arrow A in FIG. 3, the transpiration gas flows from the lower side to the upper side in the inner cylinder, and flows back into the outer cylinder by folding back through the gap with the plunger 15 when the valve is opened. A part of the peripheral surface of the outer cylinder is opened and communicated with the output ports 9a and 9b.

In addition, a connection port 23 is formed in one chamber 20a, and the connection port 23 is fitted into the opening of the other chamber 20b to communicate between the chambers 20a and 20b. A gap between the outer peripheral surface of the connection port 23 and the opening edge of the chamber 20 b is closed by an O-ring 24. The bracket 30 is a holder for screwing for mounting the flow control device 3 on a vehicle.
By forming the chambers 20a and 20b with the same material such as resin (that is, with the same linear expansion coefficient), the sealing property of the connection portion between the connection port 23 and the chamber 20b is improved even if there is a deformation according to the temperature change. Can keep.

Next, the operation of the flow control device 3 will be described.
In the solenoid portions 10a and 10b, when a current flows through the coil 11, a magnetic field is generated in the core 12, the yoke 13, and the plate 14, and a valve opening force (electromagnetic force) larger than the valve closing force (biasing force) of the spring 16 is applied. As a result, the plunger 15 is attracted to the core 12, and the opening and closing passages 21a and 21b are opened to secure the passage. At this time, the vaporized gas is introduced from the input port 8 to the chamber 20a due to the negative pressure of the intake manifold 5, and a part of the vaporized gas flows in the direction of the arrow A through the open / close passage 21a and is led to the output port 9a. Further, a part of the vaporized gas introduced into the chamber 20a is introduced from the connection port 23 into the chamber 20b, flows through the opening / closing passage 21b in the direction of arrow A, and is led out to the output port 9b. The transpiration gas derived from the output ports 9a and 9b joins at the branch pipe 4 on the downstream side of the flow control device 3 and flows to the engine 6.

  As shown by an arrow A in FIG. 3, the vaporized gas flowing through the open / close passages 21a and 21b hits the tip of the plunger 15 and reverses and flows out to the output ports 9a and 9b. It is easy to happen. Therefore, by providing one end of the output ports 9a and 9b at the reversing part, the transpiration gas flowing out from the open / close passages 21a and 21b can be directly guided to the output ports 9a and 9b, and the flow rate is reduced by suppressing the pressure loss. Suppress. The details will be described below.

FIG. 4 is a graph showing the flow rate characteristics according to the connection method of the solenoid valves. The vertical axis of the graph is the flow rate, and the horizontal axis is the differential pressure between the input port side and the output port side. The flow characteristics when the flow control device 3 according to the first embodiment is installed are indicated by a circle (◯) curve on the graph.
Further, as a comparative example of the flow characteristics, the flow characteristics when a flow control device 100 (a configuration will be described later in FIG. 5) in which two solenoid valves are modularized are installed in a pipe that communicates the canister 2 and the engine 6. The graph is indicated by a square mark (□). In addition, the flow characteristic when the flow control device 200 in which two solenoid valves are connected by piping is installed (the configuration will be described later with reference to FIG. 6) is indicated by a triangle mark (Δ) in the graph. In addition, the flow characteristics when one solenoid valve is installed are indicated by unmarked curves in the graph.

FIG. 5 is a cross-sectional view showing a configuration of a flow control device 100 in which two solenoid valves are modularized. This flow control device 100 has a configuration in which the chambers 20a and 20b are connected by the connection port 23, and is the same as the flow control device 3 of the first embodiment, but the flow control device 3 has one input port 8 and two. However, the flow rate control device 100 is different in that it has a configuration in which one input port 8 and one output port 9 are provided. Further, the flow control device 100 includes a connection port 101 that communicates the open / close passage 21 a and the output port 9, and an O-ring 102. This configuration is similar to the flow control device according to Patent Document 1 described above.
In the flow control device 100, the transpiration gas is introduced from the input port 8 into the chamber 20a, a part of which flows in the direction of the arrow B along the opening / closing passage 21a and enters the connection port 101, bypassing the opening / closing passage 21b. It is led to the output port 9 through a narrow passage on the side. A part of the vaporized gas introduced into the chamber 20a is introduced from the connection port 23 into the chamber 20b, flows in the direction of the arrow A through the open / close passage 21b, is led to the output port 9, and the vaporized gas from the connection port 101 Join. The evaporated gas derived from the output port 9 flows to the engine 6.

Since the flow rate control device 3 and the flow rate control device 100 are each configured with one input port 8 and two opening / closing passages 21a and 21b, the flow rates that can be introduced should be the same. However, in the flow control device 100, since it is necessary to bypass the open / close passage 21b after reversing once in the flow path flowing from the open / close passage 21a in the direction of arrow B, once in the open / close passage 21a as indicated by the arrow A in the flow control device 3. The distance is longer than the flow path directly flowing to the output port 9a after the reversal, the flow path shape is complicated, and the pressure loss is increased. Therefore, the flow rate is significantly reduced.
By providing two output ports 9 a and 9 b in the flow control device 3, the pressure loss in the open / close passages 21 a and 21 b can be reduced as compared with the flow control device 100. Therefore, as indicated by the broken-line arrows in FIG. 4, the flow rate of the flow rate control device 3 (◯ curve) increases significantly compared to the flow rate of the flow rate control device 100 (□ curve).

  FIG. 6 is a cross-sectional view showing a configuration of a flow control device 200 in which two solenoid valves are connected by piping. The two solenoid valves are separated and independent, and the input ports 8a and 8b are connected by piping, and the output ports 9a and 9b are connected by piping. The transpiration gas is divided by the upstream branch pipe 4a, introduced into the chamber 20a from the input port 8a, flows through the open / close passage 21a, and is led out to the output port 9a. Similarly, in the other solenoid valve, it is introduced from the input port 8b to the chamber 20b, flows through the open / close passage 21b, and is led to the output port 9b. The transpiration gas led out from the output ports 9a and 9b joins in the downstream branch pipe 4b and flows to the engine 6.

Since both the flow control device 3 and the flow control device 200 are provided with the output ports 9a and 9b at the portions where the flow paths of the open / close passages 21a and 21b are reversed, there is no difference in pressure loss. Whereas the number of ports 8 is one, the flow rate control device 200 has two input ports 8a and 8b, so the flow rates that can be introduced are different. However, since the base flow rate of the solenoid valve greatly depends on the open / close passages 21a and 21b, the flow rate of the input port 8 of the flow control device 3 or the total flow rate of the input ports 8a and 8b of the flow control device 200 depends on the open / close passage. If the total flow rate of 21a and 21b is exceeded, the flow rate control device 3 and the flow rate control device 200 are equivalent.
As a result, the flow rate of the flow control device 200 (a curve of Δ) and the flow rate of the flow control device 3 (a curve of ○) are substantially equal.

When the solenoid valve is used alone, either one of the two solenoid valves shown in FIG. 6 is installed in the pipe connecting the canister 2 and the engine 6 (the whole installation example is omitted). In this case, the branch pipes 4a and 4b are not necessary on the pipe.
Although the solenoid valve alone and the flow rate control device 3 have one input port and the flow rate that can be introduced is the same, the flow rate control device 3 has two opening and closing passages, whereas the solenoid valve alone has one opening and closing passage. Because it is a point, the flow rate is almost halved. Therefore, the flow rate of the solenoid valve alone (curved mark) is greatly reduced compared to the flow rate of the flow control device 3 (curved curve).

  As is apparent from the graph, the flow rate control device 3 having one input port and two output ports can significantly increase the flow rate compared to the flow rate control device 100 having one input port and one output port. Further, the flow rate control device 3 is provided with the output ports 9a and 9b in the opening and closing passages 21a and 21b, respectively, in which pressure loss is likely to occur, so that the pressure loss is reduced and is nearly twice the flow rate when the solenoid valve is used alone. This is advantageous because it is possible to ensure a high flow rate. In addition, the flow rate control device 3 maintains the flow rate characteristics at substantially the same level as the flow rate control device 200 in which two solenoid valves are connected by piping, while reducing costs by reducing branch piping and improving workability associated therewith. Is possible.

  FIG. 7 is an enlarged cross-sectional view of the chamber side of the flow control device 3 according to the first embodiment. The inner diameter φD of the connection port 23 is enlarged with respect to the inner diameter φd of the input port 8 so that a sufficient amount of transpiration gas is introduced into the flow control device 3. Thereby, the amount of the transpiration gas that can be introduced from the input port 8 is not limited by the connection port 23, and a flow rate decrease due to the inner diameter of the connection port 23 can be prevented.

FIG. 8 is a cross-sectional view showing a configuration in which a filter 40 is installed in the flow control device 3 according to the first embodiment. On the other hand, FIG. 9 is a cross-sectional view showing a configuration in which the filters 40a and 40b are installed in the flow control device 200 in which the two solenoid valves shown in FIG. 6 are connected by piping.
In the flow control device 3, the transpiration gas is first introduced from the input port 8 into the chamber 20 a, branches from there, one flows to the opening / closing passage 21 a, and the other flows to the opening / closing passage 21 b through the connection port 23. Therefore, it is sufficient to install the filter 40 in the middle of the flow path from the input port 8 to the connection port 23.
On the other hand, in the flow control device 200, it is necessary to install the filters 40a and 40b in the chambers 20a and 20b, respectively, and the filters cannot be integrated into one.

FIG. 10 is a cross-sectional view of the flow control device 3 according to the first embodiment, and shows a single operation state of the solenoid valve. For example, when only the solenoid unit 10b is driven to open and close in a low flow rate region where high resolution is required, and the solenoid unit 10a is normally closed (or normally opened), the chambers 20a and 20b are shared. Is possible. As a result, the chamber volume (area indicated by the dotted line in FIG. 10) with respect to the flow rate of the solenoid valve alone on the solenoid unit 10b side is approximately doubled, and the pulsation noise reduction effect is improved. Conversely, the same applies when the solenoid valve on the solenoid unit 10a side is driven to open and close alone.
On the other hand, in the flow control device 200 in which two solenoid valves are connected by piping, even if one of the solenoid valves is driven to open and close alone, the chambers 20a and 20b cannot be shared to increase the volume. Therefore, there is no change in the pulsation noise reduction effect of the chambers 20a and 20b.

As described above, according to the first embodiment, the flow rate control device 3 includes the chambers 20a and 20b, the output ports 9a and 9b for leading the fluid from the chambers 20a and 20b, the chambers 20a and 20b, and the output ports 9a and 9b. communicating the door, opening and closing the passage 21a to open and close by the plunger 15, 21b and a solenoid portion 10a for opening and closing the respective plungers 15, and 10b possess respectively, 2 solenoid valve which is integrated are connected to each other Kosonae, A connection port 23 that integrates the two solenoid valves by communicating the two solenoid valves chambers 20a and 20b, and an input port 8 that is formed only in the chamber 20a of one of the solenoid valves and introduces fluid. It was configured to provide. For this reason, when two solenoid valves are connected to increase the flow rate, the same number of output ports 9a, 9b communicating with the opening / closing passages 21a, 21b are provided as the number of electromagnetic valves, so that the opening / closing passages 21a, 21b are provided. The pressure loss at the time of passing can be suppressed, and the flow rate reduction can be suppressed. In addition, by providing only one input port 8 communicating with the chambers 20a and 20b regardless of the number of solenoid valves, the input side piping can be reduced and workability can be improved. Therefore, it is possible to provide the flow rate control device 3 that can reduce the cost without reducing the function (flow rate or the like).

  Further, according to the first embodiment, the flow control device 3 includes the filter 40 installed in the middle of the flow path from the input port 8 to the connection port 23 in the chamber 20a in which the input port 8 is formed. It was configured as follows. For this reason, even if a plurality of solenoid valves are connected, the filter 40 can be integrated into one.

  Further, according to the first embodiment, the inner diameter φD of the connection port 23 is configured to be greater than the inner diameter φd of the input port 8 on the fluid introduction side. For this reason, it is possible to prevent a decrease in flow rate due to the formation of the connection port 23, and the function of the flow control device 3 is not deteriorated.

  Further, according to the first embodiment, the chambers 20a and 20b that form the connection port 23 and the opening into which the connection port 23 is fitted are made of the same material. For this reason, the linear expansion coefficient becomes the same, and even if there is a temperature change, the sealing performance of the connection portion can be maintained well.

In the first embodiment, the method of connecting two electromagnetic valves in FIGS. 1 to 10 is illustrated, but the present invention is not limited to this, and three or more electromagnetic valves can be connected in the same manner. is there. An example is shown below.
FIG. 11 is a front view showing a configuration of a flow control device 3a in which three electromagnetic valves are connected. This flow control device 3a includes a total of three solenoid valves: a solenoid valve having a solenoid unit 10a and a chamber 20a, a solenoid valve having a solenoid unit 10b and a chamber 20b, and a solenoid valve having a solenoid unit 10c and a chamber 20c. Consists of. Since the structures of the solenoid parts 10a to 10c are the same, the description thereof is omitted.
Opening / closing passages 21a to 21c (not visible in the drawing) are formed in the chambers 20a to 20c, respectively, and output ports 9a to 9c are provided in the vicinity thereof. The number of output ports 9a to 9c is three, which is the same as the number of solenoid valves, whereas the number of input ports 8 is only one. The chamber 20a in which the input port 8 is formed and the chamber 20b without the input port 8 are communicated with each other through the connection port 23. Similarly, the chamber 20a in which the input port 8 is formed and the chamber 20c without the input port 8 are connected to each other. 23a is communicated.
The input port 8 may be formed not in the chamber 20a but in the chamber 20b or the chamber 20c, and the chamber in which the input port 8 is formed and other chambers may be communicated with each other through a connection port.
Further, in this flow control device 3a, a filter 40 (not shown) may be installed in the middle of the flow path from the input port 8 of the chamber 20a to the connection ports 23 and 23a.

1 to 10 exemplify the flow rate control device 3 having a configuration in which the chambers 20a and 20b communicate with each other through the connection port 23. However, the present invention is not limited to this, and the chambers may be directly connected to each other, for example. . An example is shown below.
FIG. 12 is a front view showing the configuration of the flow rate control device 3b in which the openings of the chambers 20a and 20b are directly connected. FIG. 13 (a) shows a cross-sectional view in the case of welding connection, and FIG. The figure is shown in FIG. This flow control device 3b is composed of solenoid parts 10a and 10b and chambers 20a and 20b, and has one input port 8 and two output ports 9a and 9b. Further, the openings of the chambers 20a and 20b are connected to form a connecting portion 50, and the chambers 20a and 20b communicate with each other. The connection part 50 may be connected by any method. For example, as shown in FIG. 13A, the opening end of the chamber 20b is fitted into the opening of the chamber 20a and welded, or the chamber 20a as shown in FIG. 13B. The opening of the chamber 20 b is fitted into the opening of the chamber and the gap between the two is closed by the O-ring 51.

In this flow control device 3b, the chambers 20a and 20b are formed of the same material such as resin (that is, the same linear expansion coefficient), so that the sealing performance of the connecting portion 50 is good even when there is deformation according to temperature change. Can be kept in. Further, by using the same material for the chambers 20a and 20b, various connection methods such as welding connection and direct connection using the O-ring 51 are possible, and the inner diameter φD of the connection portion 50 is ensured (φD ≧ φd). It is possible to suppress a decrease in the flow rate. Moreover, since the distance between the chambers 20a and 20b can be shortened compared to the connection method using the connection port 23, the pressure loss can be further reduced.
In this flow control device 3b, since the chambers 20a and 20b are integrated, when a filter is installed in the chamber, it flows to one open / close passage via the filter, but the other open / close passage is filtered. It will flow without going through. Therefore, a filter 52 is installed at the switching portion between the input port 8 and the chamber. As shown in an enlarged view in FIG. 14, the filter 52 has a columnar shape equal to the inner diameter of the chambers 20 a and 20 b, and includes a resin portion 53 serving as a frame and a mesh portion 54.

1 to 13, the input port 8 is connected to the canister 2 side, the output ports 9a and 9b are connected to the engine 6 side, and the vaporized gas flows from the input port 8 to the output ports 9a and 9b. However, conversely, the input port 8 may be connected to the engine 6 side, the output ports 9a and 9b may be connected to the canister 2 side, and the vaporized gas may flow from the output ports 9a and 9b to the input port 8.
When the input and output are reversed, for example, when the opening and closing passages 21a and 21b are opened in FIG. 3, transpiration gas is introduced from the output ports 9a and 9b due to the negative pressure of the intake manifold 5, and the opening and closing passages 21a and 21b are connected to the arrow A. The vaporized gas entering the chamber 20b flows into the chamber 20b through the connection port 23, enters the chamber 20a, joins, is led from the chamber 20a to the input port 8, and flows to the engine 6. .
In this case, the inner diameters of the output ports 9a and 9b on the input side should be made larger than the inner diameter of the connection port 23 to ensure the flow rate.

  In addition to the above, within the scope of the invention, the invention of the present application can be modified with any component of the embodiment or omitted with any component of the embodiment.

  1 Fuel tank, 2 canister, 3, 3a, 3b, 100, 200 Flow rate control device, 4, 4a, 4b Branch piping, 5 Intake manifold, 6 Engine, 7 Control unit, 8, 8a, 8b Input port, 9, 9a ~ 9c Output port, 10a ~ 10c Solenoid part, 11 coil, 12 core, 13 yoke, 14 plate, 15 plunger, 16 spring, 17 pin, 18, 19, 24, 51, 102 O-ring, 20a-20c chamber, 21a -21c Open / close passage, 22 cap, 23, 101 connection port, 30 bracket, 40, 40a, 40b, 52 filter, 50 connection part, 53 resin part, 54 mesh part.

Claims (6)

A chamber, a first port that introduces fluid into the chamber or leads fluid from the chamber, an open / close passage that communicates the chamber and the first port and is opened and closed by a valve, and a solenoid unit that drives the valve to open and close the possess respectively, and a plurality of solenoid valves that are integrally connected to each other,
Communicates each of said chambers between said plurality of solenoid valves, a connection part for integrating the plurality of solenoid valves,
Wherein the plurality of formed only in the chamber of any one of the solenoid valves of the solenoid valves, fluid control device comprising a Turkey and a second port for introducing or deriving a fluid. Wherein the chamber second port formed in, the fluid control apparatus according to claim 1, further comprising a filter in the middle of the flow path from the second port to the connection section. The inner diameter of the connecting portion, the fluid control apparatus according to claim 1, wherein the at first port and fluid inlet side to become the port inner diameter or more of said second port. The connection portion is a fluid control apparatus according to claim 1, characterized in that the same material between the chambers. The connecting portion is fitted to the second port the solenoid valve formed in and the opening provided in the other one of said chamber of said solenoid valve, the opening provided on the other of said chambers 2. The fluid control device according to claim 1, wherein the fluid control device comprises a connecting port. A fluid control device comprising two electromagnetic valves,
The connecting portion, wherein, wherein the opening provided in the chamber end of one of said solenoid valves, in that fitted comprising an opening provided in the chamber end of the other of the solenoid valves Item 2. The fluid control device according to Item 1.

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