JP2004144243A - Small-size solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-size solenoid valve keeping the excellent seal balance and restricted in internal volume of a valve chamber when the valve is closed. <P>SOLUTION: In this small-size solenoid valve 1, a valve body 3 connected to a fitting plate 2 formed with a first to a third ports 5a to 5c is provided with a rocking member 10 freely to rock, and a diaphragm 7 for abutting or separating on/from valve seat parts 6a and 6b communicated with the first and the third ports is fixed to the rocking member 10, and the rocking member 10 is rocked to switch the communicating condition of the first to the third ports 5a to 5c by making the diaphragm 7 abut or separate on/from the valve seat parts 6a and 6b. This small-size solenoid valve 1 is provided with an inclined surface 22 corresponding to an angle A of abutment of the diaphragm 7 on the valve seat parts 6a and 6b. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a small solenoid valve capable of controlling a flow direction of pressure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a small electromagnetic valve capable of controlling a flow direction of pressure is used for dispensing control of a liquid analyzer 50 shown in FIG. 6, for example. Dispensing refers to transferring blood, body fluid, pure water or physiological saline for dilution water, a reagent to be reacted, and the like to a reaction cell. In the liquid analyzer 50, a syringe pump is used to control the flow rate with a dispensing accuracy of several μL. The syringe pump continuously injects blood, body fluid, pure water or physiological saline of dilution water, a reagent to be reacted, and the like at a set flow rate (here, several μL) with a syringe (injector). This is because there is an advantage that the speed can be easily adjusted.
[0003]
The small solenoid valve 100 used in the liquid analyzer 50 has three ports formed therein, and each port is connected to a pure water pump 51, a syringe pump 52, and a reaction cell 53, respectively. A nozzle 54 is provided between the small solenoid valve 100 and the reaction cell 53 so that pure water can be supplied to the reaction cell 53 at an accurate flow rate. For such a small solenoid valve 100, it is required to control the flow rate of pure water with several μL to several tens μL (see Non-Patent Document 1).
[0004]
FIG. 7 is a sectional view of a conventional small solenoid valve 100. 8 and 9 are enlarged views of the valve portion of the conventional small solenoid valve 100. FIG.
The small solenoid valve 100 includes a valve body in which a valve body 101 is connected to a plate 102, and further, a casing 110 is connected to the valve body 101. The plate 102 has a first port 3a connected to the pure water pump 51 shown in FIG. 6, a second port 3b connected to the syringe pump 52 shown in FIG. 6, and a second port 3b connected to the reaction cell 53 shown in FIG. The three ports 103c are formed in parallel, and a valve chamber 105 communicating with the first to third ports 103a to 103c is formed by holding the outer edge of the diaphragm 104 between the valve body 101 and the plate 102. ing. Valve seats 106a and 106b are formed in openings where the first and third ports 103a and 103c communicate with the valve chamber 105, and first and second bulging portions 107a that come into contact with the valve seats 106a and 106b. , 107b are formed on the lower end surface of the diaphragm 104. The diaphragm 104 is fixed to a swing member 109 that is swingably supported by a support shaft 108 fixed to the valve body 101, and switches between the first to third ports 103 a to 103 c according to the swing of the swing member 109. .
[0005]
On the other hand, in the casing 110, a coil bobbin 113 for exciting the fixed iron core 112 when energizing the electromagnetic coil 111 is provided, and a movable iron core 114 is slidably inserted through the coil bobbin 113. A force in the direction B in the figure is constantly applied to the movable iron core 114 by a first spring 115 to push down a displacement member 116 slidably housed in the valve body 101. The displacement member 116 includes a first pressing member 117a and a second pressing member 117b that come into contact with the swinging member 109, and the first and second pressing members 117a and 117b are symmetrically arranged with the support shaft 108 interposed therebetween. The first pressing member 117a is fixed to the displacement member 116, while the second pressing member 117b is slidably held by the displacement member 116, and a force in the direction B in the drawing is constantly applied by the second spring 118. As the second spring 118, a spring having a lower urging force than the first spring 115 is used.
[0006]
In the case where the electric signal is not supplied, such a small solenoid valve 100 causes the movable iron core 114 to push down the displacement member 116 in the direction B in the drawing by the urging force of the first spring 115 as shown in FIG. The swinging member 109 is pressed in the direction B in the drawing by the pressing member 117a. Since the biasing force of the second spring 118 is weaker than that of the first spring 115, the swinging member 109 pushes up the second pressing member 117b in the direction A in the figure against the biasing force of the second spring 118 and tilts. Thereby, in the diaphragm 104, the first bulging portion 107a is in close contact with the valve seat portion 106a of the first port 103a to close the first port 103a, and the second bulging portion 107b is closed by the valve of the third port 103c. The third port 103c is opened apart from the seat 106b, and the second port 103b and the third port 103c are communicated. When the syringe pump 52 is driven in this state, pure water is injected from the syringe pump 52 into the reaction cell 53 via the second port 103b, the valve chamber 105, and the third port 103c of the small solenoid valve 100.
[0007]
When the small solenoid valve 100 is supplied with an electric signal, as shown in FIG. 9, the movable iron core 114 is attracted to the fixed iron core 112 and is opposed to the urging force of the first spring 115 in the direction A in the figure. And the force in the direction B in the figure applied to the displacement member 116 is released. Accordingly, the second pressing member 117b presses the swinging member 109 in the direction B in the drawing to swing by the urging force of the second spring 118. Accordingly, in the diaphragm 104, the second bulging portion 107b is in close contact with the valve seat portion 106b of the third port 103c to close the third port 103c, and the first bulging portion 107a is closed by the valve of the first port 103a. The first port 103a is opened apart from the seat 106a, and the first port 103a and the second port 103b are communicated. When the syringe pump 53 is driven in this state, pure water is supplied from the pure water pump 51 to the syringe pump 52 via the first port 103a, the valve chamber 105, and the second port 103b of the small solenoid valve 100 (for example, see Patent Reference 1).
[0008]
[Non-patent document 1]
"Medical / Analyzer Capture & Application Book," CK Corporation, October 16, 1998, p. 2-3
[Patent Document 1]
JP-A-2000-297876 (pages 3 to 5, FIGS. 1 to 3).
[0009]
[Problems to be solved by the invention]
However, in the conventional small solenoid valve 100, since the first and second bulging portions 107a and 107b of the diaphragm 104 are provided so as to protrude into the valve chamber 105, the first bulging portion 107a (or the second bulging portion) of the diaphragm 104 is provided. When the first port 103a (or the third port 103c) is closed by bringing the bulging portion 107b) into contact with the valve seat 106a (or the valve seat 106b), the first bulging portion 107a (or the second A gap is formed between the diaphragm 104 and the valve chamber 105 around the bulging portion 107b), increasing the internal volume of the valve chamber 105 when the valve is closed. When the internal volume becomes large, a liquid pool is generated and the flow of the fluid is deteriorated. Moreover, a turbulent flow is easily generated around the first and second bulging portions 107a and 107b of the diaphragm 104, and the flow of the fluid is further deteriorated. Therefore, when the small electromagnetic valve 100 is used in the liquid analyzer of FIG. 6, there is a possibility that an extremely small flow rate of about several μL to several tens μL cannot be accurately controlled.
[0010]
Also, when the swing member 109 swings to bring the first bulging portion 107a (or the second bulging portion 107b) of the diaphragm 104 into contact with the valve seat 106a (or the valve seat 106b), Since the outer portion of the first bulging portion 107a (or the second bulging portion 107b) of 104 was pressed more strongly against the valve seat portion 106a (or the valve seat portion 106b) than the inner portion, the seal balance was poor. For this reason, the liquid leaks from the inside of the first bulging portion 107a (or the second bulging portion 107b) of the diaphragm 104, and it may not be possible to accurately control the extremely small flow rate of about several μL. On the other hand, although it is conceivable to adjust the sealing force of the diaphragm 104 in accordance with the inner portion where the sealing force is weak, the load on the outside of the first and second bulging portions 107a and 107b increases, and the diaphragm 104 is deteriorated. There is a problem to make it easier.
[0011]
The present invention has been made to solve the above problems, and has as its object to provide a small solenoid valve having a small internal volume of a valve chamber when the valve is closed and having a good seal balance.
[0012]
[Means for Solving the Problems]
The small solenoid valve according to the present invention has the following configuration.
(1) A swing member is swingably provided on a valve body in which a plurality of ports are formed, and a diaphragm that abuts or separates from a valve seat portion communicating with the port is fixed to the swing member. In a small solenoid valve in which the diaphragm is brought into contact with or separated from the valve seat by swinging using a solenoid mechanism to switch the communication state of the port, the valve seat has an inclined surface corresponding to an angle at which the diaphragm contacts. It is characterized by:
[0013]
According to the invention having the above configuration, when the swing member is swung by the solenoid mechanism and the port is switched by the diaphragm, the diaphragm abuts on the outside and the inside of the valve seat with uniform pressure, and the sealing property is improved. Therefore, it is not necessary to provide a bulging portion or the like in contact with the valve seat on the diaphragm, so that the internal volume of the valve chamber when the valve is closed can be reduced, and the seal balance can be improved.
[0014]
(2) A swing member is swingably provided on a valve body having a plurality of ports formed thereon, and a diaphragm which abuts or separates from a valve seat portion communicating with the port is fixed to the swing member. In a small solenoid valve in which the diaphragm is brought into contact with or separated from the valve seat by switching using a solenoid mechanism to switch the communication state of the port, the valve seat is provided in a convex shape around the port, and the outer side is provided with the outside. The feature is that the inside height is different.
[0015]
According to the invention having the above configuration, when the swing member is swung by the solenoid mechanism and the port is switched by the diaphragm, the diaphragm abuts on the outside and the inside of the valve seat with uniform pressure, and the sealing property is improved. In order to prevent fluid leakage due to the fact that the valve seat bites into the diaphragm, there is no need to provide a swelling portion in contact with the valve seat on the diaphragm, and the internal volume of the valve chamber when the valve is closed can be reduced. The sealing performance can be improved with good sealing balance.
[0016]
(3) The small solenoid valve according to (1) or (2), wherein the valve seat has an inclination with respect to a base point defined between the fulcrum where the swing member swings and the port. Features.
Therefore, the diaphragm can be brought into close contact with the entire valve seat with a uniform pressure.
[0017]
(4) The small solenoid valve according to (1) or (3), wherein a projection is provided on the valve seat.
Therefore, when the diaphragm comes into contact with the valve seat portion, the protrusion bites into the diaphragm to prevent fluid leakage, so that the sealing performance can be improved.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Next, a first embodiment of a small solenoid valve according to the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view of the small solenoid valve 1 when not energized. FIG. 3 is a sectional view of the small solenoid valve 1 when energized.
The small solenoid valve 1 is used in the liquid analyzer 50 of FIG. 6, similarly to the small solenoid valve 100 described in the section of the related art. In the small solenoid valve 100 described in the section of the prior art, the first and second bulging portions 107a and 107b are provided on the diaphragm 104 to secure the sealing property on the diaphragm 104 side. In the small electromagnetic valve 1 of the embodiment, the inclined surfaces 22 are provided on the valve seats 6a and 6b, and the sealing property is secured on the valve seats 6a and 6b side.
[0019]
The small electromagnetic valve 1 has a valve body formed by fixing a valve body 3 to a mounting plate 2, and a casing 4 is connected to the valve body 3. The mounting plate 2 has a first port 5a connected to the pure water pump 51 in FIG. 6, a second port 5b connected to the syringe pump 52 in FIG. 6, and a third port 5c connected to the reaction cell 53 in FIG. Are formed, and valve seats 6a and 6b (described later) are provided to communicate with the first and third ports 5a and 5c, respectively.
[0020]
The valve body 3 is formed in a hollow cylindrical shape. By holding the outer edge of the diaphragm 7 between the valve body 3 and the mounting plate 2, the valve body 3 is connected to the first to third ports 5a to 5c. A communicating valve chamber 8 is formed. The diaphragm 7 is formed of a thin circular shape such as fluoro rubber, silicon rubber, EPDM (ethylene-propylene-diene terpolymer), and is pivotally supported by a support shaft 9 fixed to the valve body 3. Is fixed to the swinging member 10. Therefore, when the swing member 10 is swung, the diaphragm 7 is brought into contact with the valve seat 6a of the first port 5a or the valve seat 6b of the third port 5c, and the first to third ports 5a to 5c are closed. The communication state can be switched.
[0021]
The casing 4 has a built-in solenoid mechanism. The solenoid mechanism includes a hollow cylindrical coil bobbin 12 around which an electromagnetic coil 11 is wound, and a fixed iron core 13 is fixed to an upper end opening of a hollow hole of the coil bobbin 12, while a fixed iron core 13 is fixed to a lower end opening of the hollow hole of the coil bobbin 12. The movable iron core 14 is slidably inserted. The electromagnetic coil 11 is energized via a lead 15, and a circuit board 16 for controlling a voltage is provided between the lead 15 and the electromagnetic coil 11.
[0022]
The movable iron core 14 is slidably inserted into a hollow hole 17 formed in the valve body 3 such that a tip end portion of the movable iron core 14 abuts against the swinging member 10, and a downward force is constantly applied by a first spring 18. . The tip of the pressing member 20 is in contact with the swing member 10 at a position symmetrical to the movable iron core 14 with the support shaft 9 interposed therebetween. The pressing member 20 is slidably received in a hollow hole 19 formed in the valve body 3, and is constantly applied with a downward force by a second spring 21 disposed in the hollow hole 19. The second spring 21 has a lower urging force than the first spring 18. Therefore, by adjusting the urging force of the first spring 18 by moving the movable core 14 up and down, the balance between the urging forces of the first spring 18 and the second spring 21 is changed, and the swing member 10 is swung. be able to.
[0023]
Next, the valve seats 6a and 6b of the small solenoid valve 1 will be described. FIG. 1 is a partially enlarged sectional view of the small solenoid valve 1. In the present embodiment, the inclined surface of the valve seat 6a and the inclined surface of the valve seat 6b are formed in the same manner. Therefore, here, the inclined surface of the valve seat 6a will be described, and the inclined surface of the valve seat 6b will be described. The description of is omitted.
[0024]
The valve seat 6 a is provided around the first port 5 a of the mounting plate 2, and forms a sealing surface S that comes into contact with the diaphragm 7. The valve seat 6a is formed with an inclined surface 22 so that the outside is lower than the inside. The inclined surface 22 is formed so as to correspond to the angle A at which the swing member 10 swings from the horizontal state by a predetermined angle A to bring the diaphragm 7 into contact with the valve seat 6a. Specifically, in the present embodiment, since the swing member 10 is tilted about 1.5 degrees from the horizontal position L1 with the support shaft 9 as a base and the diaphragm 7 contacts the valve seat portion 6a, An inclined surface 22 is formed so as to be inclined outward about 1.5 degrees to the opposite side (lower side in the figure) from the diaphragm 7. Here, it is desirable that the base point M is provided near the first port 5a. This is because, when provided near the support shaft 9, the volume between the opening of the second port 5b and the diaphragm 7 is reduced, and the flow rate is reduced.
[0025]
It is to be noted that merely providing the inclined surface 22 on the mounting plate 2 may reduce the volume between the second port 5b and the diaphragm 7 and may cause a liquid pool or the like in the valve chamber 8; Is provided with an inclined surface 23. The inclined surface 23 is formed so as to be inclined inward from the base point M by a predetermined angle B toward the opposite side (lower side in the figure) from the diaphragm 7. In the present embodiment, the predetermined angle B is set to 1.5 degrees corresponding to the inclined surface 22.
[0026]
The small solenoid valve 1 having such a configuration operates as follows.
When an electric signal is not supplied to the small solenoid valve 1, as shown in FIG. 2, since the fixed iron core 13 does not attract the movable iron core 14, the movable iron core 14 is urged by the first spring 18 and the swing member 10 Is pressed down. Since the second spring 21 has a weaker urging force than the first spring 18, the swing member 10 swings so as to push the pressing member 20 upward against the urging force of the second spring 21. As a result, the diaphragm 7 comes into contact with the inclined surface 22 of the valve seat 6b of the first port 5a to close the first port 5a, and separates from the inclined surface 22 of the valve seat 6b of the third port 5c. Then, the third port 5c is opened to connect the second port 5b and the third port 5c. Therefore, when the syringe pump 52 of FIG. 6 is filled with pure water in advance and the syringe pump 52 is driven in a state where no electric signal is supplied to the small solenoid valve 1, the pure water is supplied from the syringe pump 52 to the small solenoid valve 1. It is injected into the reaction cell 53 via the 2 port 5b, the valve chamber 8, and the third port 5c.
[0027]
On the other hand, when an electric signal is supplied to the small solenoid valve 1, as shown in FIG. 3, the fixed iron core 13 is excited and the movable iron core 14 is pulled up against the urging force of the first spring 18, so that the movable member 14 The force for pressing the swing member 10 downward is released. Accordingly, the pressing member 20 is urged by the second spring 21 to press the swing member 10 downward to swing. As a result, the diaphragm 7 separates from the inclined surface 22 of the valve seat 6b of the first port 5a to open the first port 5a and abuts on the inclined surface 22 of the valve seat 6b of the third port 5c. Thus, the third port 5c is closed, and the first port 5a and the second port 5b are communicated. When the syringe pump 52 of FIG. 6 is driven in this state, pure water is supplied from the pure water pump 51 to the syringe pump 52 via the first port 5a, the valve chamber 8, and the second port 5b of the small solenoid valve.
[0028]
Here, the diaphragm 7 of the small solenoid valve 1 is not provided with the first and second bulging portions 107a and 107b unlike the diaphragm 104 of the small solenoid valve 100 described in the section of the related art. Since the slopes 22 are formed on the valve seats 6a, 6b corresponding to the contact angle A to change the height between the outside and the inside of the valve seats 6a, 6b, the swing member 10 and the valve seat are changed. The diaphragm 7 can be sandwiched between the portion 6a (or the valve seat portion 6b), and a predetermined sealing force is secured.
[0029]
At this time, since the inclined surfaces 22 of the valve seat portions 6a and 6b are formed with reference to a base point M defined between the support shaft 9 and the first and third ports 5a and 5c, the diaphragm 7 is moved to the first and third ports. The third ports 5a and 5b are brought into close contact with the entire periphery.
[0030]
Further, in the small solenoid valve 100 (see FIGS. 8 and 9) described in the section of the prior art, since the first and second bulging portions 107a and 107b are provided, around the valve seat portions 106a and 106b when the valve is closed. A gap is created between the diaphragm 104 and the valve chamber 105, increasing the internal volume of the valve chamber 105 when the valve is closed. On the other hand, in the small solenoid valve 1 of the present embodiment, the diaphragm 7 is directly brought into contact with the inclined surface 22 of the valve seat 6a (or the valve seat 6b) to seal the valve. No gap is formed between the diaphragm 7 and the valve chamber 8 around (or the valve seat 6b). Therefore, the small solenoid valve 1 of the present embodiment can make the internal volume of the valve chamber 8 smaller when the valve is closed than the small solenoid valve 100 described in the section of the related art. Specifically, in the small solenoid valve 100 (see FIGS. 8 and 9) described in the section of the related art, the internal volume of the valve chamber 105 when the valve is closed is about 25 μL, whereas the present embodiment is different from the first embodiment. In the small electromagnetic valve 1, the internal volume of the valve chamber 8 when the valve was closed was about 10 μL, and the internal volume of the valve chamber 8 when the valve was closed could be reduced to about one-fourth. Therefore, liquid accumulation and turbulence hardly occur in the valve chamber 8 when the valve is closed, the flow of the fluid is improved, and it is possible to accurately control even a very small flow rate of about several μL to several tens μL. .
[0031]
Therefore, according to the small solenoid valve 1 of the first embodiment, the swing member 10 is swingably provided on the valve body 3 connected to the mounting plate 2 in which the first to third ports 5a to 5c are formed. The diaphragm 7, which comes into contact with or separates from the valve seats 6a and 6b communicating with the first and third ports, is fixed to the rocking member 10, and the rocking member 10 is rocked by switching the state of energization to the electromagnetic coil 111. When the diaphragm 7 is brought into contact with or separated from the valve seats 6a and 6b to switch the communication state of the first to third ports 5a to 5c, the valve seats 6a and 6b have an angle at which the diaphragm 7 contacts. , The internal volume of the valve chamber 8 when the valve is closed can be reduced, and the seal balance can be improved.
[0032]
Further, the valve seats 6a and 6b are provided with inclinations with reference to a base point M defined between the support shaft 9 serving as a fulcrum on which the swing member 10 swings and the first port 5a (or the third port 5c). As a result, the diaphragm 7 can be brought into close contact with the entire valve seats 6a and 6b with a uniform pressure.
[0033]
(2nd Embodiment)
Next, a second embodiment of the small solenoid valve of the present invention will be described with reference to the drawings. FIG. 4 is an enlarged sectional view of a valve portion of the small solenoid valve 30.
The small solenoid valve 30 of the second embodiment is obtained by improving the small solenoid valve 1 of the first embodiment so as to improve the sealing performance. Here, a configuration different from that of the first embodiment will be described. However, other descriptions are omitted. The same components as those in the first embodiment are denoted by the same reference numerals.
[0034]
The small electromagnetic valve 30 is formed such that an annular projection 31 protrudes toward the diaphragm 7 on the valve seat portions 6a and 6b. Therefore, the projection 31 is pressed against the diaphragm 7 to seal, so that the projection 31 also functions as a valve seat. The tip of the projection 31 has a hemispherical cross section in order to disperse stress on the diaphragm 7, is inclined parallel to the inclined surface 22, and the outside is lower than the inside. Accordingly, when the swinging member 10 swings to bring the diaphragm 7 into contact with the projection 31, the projection 31 bites into the diaphragm 7 with a uniform pressure, and the fluid leaks from the valve chamber 8 to the first port 5 a or the third port 5 c. To prevent When the projection 31 bites into the diaphragm 7, the inclined surfaces 22 of the valve seats 6a and 6b also come into contact with the diaphragm 7 to prevent fluid leakage.
[0035]
Here, since the protrusion 31 is provided only to protrude around the first and third ports 5a and 5b, the swing amount of the swing member 10 is smaller than that of the small solenoid valve 1 of the first embodiment. Hardly changes. For this reason, the internal volume of the valve chamber 8 when the valve is closed is smaller than that of the conventional small solenoid valve 100 (see FIGS. 8 and 9), and liquid accumulation and the like are less likely to occur.
[0036]
Therefore, according to the small solenoid valve 30 of the second embodiment, the projection 31 is provided in a convex shape around the first and third ports 5a and 5c, and the heights of the outside and the inside are different. The internal volume of the valve chamber 8 when the valve is closed can be reduced, and the sealing performance can be improved with a good seal balance.
Further, since the projections 31 are provided on the valve seats 6a and 6b, double sealing by the valve seats 6a and 6b and the projections 31 is enabled, and the sealing performance can be improved.
[0037]
(Third embodiment)
Next, a second embodiment of the small solenoid valve of the present invention will be described with reference to the drawings. FIG. 5 is an enlarged sectional view of the valve portion of the small solenoid valve 40.
The small solenoid valve 40 of the third embodiment is obtained by improving the small solenoid valve 1 of the first embodiment so as to improve the sealing performance. Here, a configuration different from the first embodiment will be described. However, other descriptions are omitted. The same components as those in the first embodiment are denoted by the same reference numerals.
[0038]
The small solenoid valve 40 is configured such that the valve seats 41a and 41b form annular concave portions 42a and 42b around the inclined surface 22 formed on the mounting plate 2 with respect to the base point M, so that the first and third ports 5a are formed. , 5b in a convex shape. The inclined surface 22 remains at the distal ends of the valve seats 41a and 41b, and the outside is lower than the inside. Therefore, when the swing member 10 swings, the valve seat 41 a (or the valve seat 41 b) sandwiches the diaphragm 7 between the swing member 10 and the inclined surface 22 and the first port 5 a (or the third port 5 c). ) Is closed. At this time, since the outside of the valve seat 41a (or the valve seat 41b) is lower than the inside, the valve seat 41a (or the valve seat 41b) comes into contact with the diaphragm 7 with a uniform pressure. Further, the valve seat portion 41a (or the valve seat portion 41b) prevents the fluid from leaking from the valve chamber 8 into the first port 5a (or the third port 5c) by digging into the diaphragm 7.
[0039]
Therefore, according to the small solenoid valve 40 of the third embodiment, the valve seats 41a and 41b are provided in a convex shape around the first and third ports 5a and 5b, and have an angle A at which the diaphragm 7 contacts. Since the corresponding inclined surface 22 is provided at the distal end, the internal volume of the valve chamber when the valve is closed can be reduced, and the sealing performance can be improved with a good seal balance.
Further, since the valve seats 41a and 41b are inclined with respect to a base point M defined between the support shaft 9 serving as a fulcrum of the swing of the swing member 10 and the first and third ports 5a and 5c. The diaphragm 7 can be brought into close contact with the entire valve seats 41a and 41b.
[0040]
As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and various applications are possible.
[0041]
(1) For example, in the above embodiment, the first to third ports 5a to 5c are formed in the mounting plate 2. On the other hand, the number of ports may be changed, and an inclined surface may be provided in the valve seat of the port that is opened and closed by the diaphragm.
[0042]
(2) For example, in the above embodiment, the swing member 10 is pivotally supported by the support shaft 9, and the movable iron core 14 and the pressing member 20 are brought into contact with each other at symmetrical positions with respect to the support shaft 9. On the other hand, a displacement member or the like may be provided between the movable core 14 and the swing member 10 so that the movable core 14 is arranged coaxially with the support shaft 9.
[0043]
(3) For example, in the above-described embodiment, the small electromagnetic valves 1, 30, and 40 are used in a liquid analyzer that controls the flow rate in a minute amount. On the other hand, it may be used for an apparatus in which the flow rate of the liquid to be controlled is not very small.
[0044]
(4) For example, in the second embodiment, the tip of the protrusion 31 is inclined, but may be provided horizontally. Even in this case, since the inclined surface 22 is formed in the valve seats 6a and 6b, the diaphragm 33 can be in close contact with the valve seats 6a and 6b along the inclined surface 22 to ensure the sealing performance, and furthermore, The projections 31 are made to bite into the diaphragm 33 to improve the sealing performance.
[0045]
(5) For example, in the third embodiment, the valve seat portions 41a and 41b are formed so as to cross the inclined surface 22. On the other hand, the valve seat may be provided in a convex shape around the port of the flat mounting plate so that the height differs between the outside and the inside of the valve seat.
[0046]
(6) For example, in the second embodiment, the tip of the projection 31 is formed in a hemispherical cross section. In the third embodiment, the tip of the valve seats 41a and 41b is formed by the inclined surface 22. Has formed. On the other hand, for example, the projection or the valve seat may be formed in a triangular cross section to provide a curve at the tip.
[0047]
【The invention's effect】
Therefore, according to the small solenoid valve of the present invention, the swing member is swingably provided on the valve body in which the plurality of ports are formed, and the swing member contacts or separates from the valve seat communicating with the port. In a device in which the diaphragm is fixed and the swing member is swung to make the diaphragm contact or separate from the valve seat to switch the communication state of the port, the valve seat has an inclined surface corresponding to an angle at which the diaphragm contacts. , The internal volume of the valve chamber when the valve is closed can be reduced, and the seal balance can be improved.
[0048]
According to the small solenoid valve of the present invention, the swing member is swingably provided on the valve body in which the plurality of ports are formed, and the swing member contacts or separates from the valve seat communicating with the port. In a small solenoid valve in which a diaphragm is fixed and a swing member is oscillated by using a solenoid mechanism to contact or separate a diaphragm from a valve seat to switch a communication state of a port, a valve seat is provided around a port. Since the outer and inner heights are different from each other, the internal volume of the valve chamber when the valve is closed can be reduced, and the sealing performance can be improved with a good seal balance.
[Brief description of the drawings]
FIG. 1 is a partially enlarged sectional view of a small solenoid valve according to a first embodiment of the present invention.
FIG. 2 is a sectional view of the small solenoid valve when power is not supplied.
FIG. 3 is also a cross-sectional view of the small solenoid valve when energized.
FIG. 4 is an enlarged sectional view of a valve portion of a small solenoid valve according to a second embodiment of the present invention.
FIG. 5 is an enlarged sectional view of a valve portion of a small solenoid valve according to a third embodiment of the present invention.
FIG. 6 is a conceptual diagram of a liquid analyzer.
FIG. 7 is a sectional view of a conventional small solenoid valve.
FIG. 8 is an enlarged view of a valve portion of a conventional small solenoid valve, showing a state where a second port and a third port are communicated with each other.
FIG. 9 is an enlarged view of a valve portion of a conventional small solenoid valve, showing a state in which a first port and a second port are communicated with each other.
[Explanation of symbols]
1 small solenoid valve
2 Mounting plate
3 Valve body
5a 1st port
5b 2nd port
5c 3rd port
6a Valve seat
6b Valve seat
7 diaphragm
10 Swing member
11 Electromagnetic coil
12 coil bobbin
13 Fixed iron core
14 Movable iron core
18 1st spring
20 Pressing member
21 Second spring
30 small solenoid valve
31 protrusion
40 small solenoid valve
41a Valve seat
41b Valve seat
A angle
M base point

Claims (4)

A swing member is swingably provided on a valve body having a plurality of ports formed thereon, and a diaphragm that abuts or separates from a valve seat portion communicating with the port is fixed to the swing member, and the swing member is a solenoid. A small solenoid valve that switches the communication state of the port by causing the diaphragm to abut or separate from the valve seat by swinging using a mechanism,
The said valve seat part has the inclined surface corresponding to the angle which the said diaphragm contacts, The small electromagnetic valve characterized by the above-mentioned. A swing member is swingably provided on a valve body having a plurality of ports formed thereon, and a diaphragm that abuts or separates from a valve seat portion communicating with the port is fixed to the swing member, and the swing member is a solenoid. A small solenoid valve that switches the communication state of the port by causing the diaphragm to abut or separate from the valve seat by swinging using a mechanism,
The small solenoid valve according to claim 1, wherein the valve seat portion is provided in a convex shape around the port, and has different heights on the outside and the inside. In the small solenoid valve according to claim 1 or 2,
A small solenoid valve characterized in that the valve seat is inclined with respect to a base point defined between a fulcrum at which the swing member swings and the port. The small solenoid valve according to claim 1 or claim 3,
A small solenoid valve, wherein a projection is provided on the valve seat.

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