阅读说明：本技术 阀以及具备阀的流体控制装置 (Valve and fluid control device provided with valve ) 是由 川村宪一郎 儿玉幸治 竹村洋 阿知波宽基 于 2018-12-28 设计创作，主要内容包括：阀具备第一阀壳体、第二阀壳体、隔膜、第一固定部、以及第二固定部,隔膜与第一阀壳体一起形成上游侧阀室,与第二阀壳体一起形成下游侧阀室,并能够在使上游侧阀室和下游侧阀室成为非连通状态的第一位置和使上游侧阀室和下游侧阀室成为连通状态的第二位置之间移动,在第二位置与第二排出流路的入口或者下游侧阀室的壁面接触而将第二排出流路和第一排出流路之间密封,在第一位置使第一排出流路和第二排出流路连通。(The diaphragm is movable between a first position at which the upstream valve chamber and the downstream valve chamber are in a non-communicating state and a second position at which the upstream valve chamber and the downstream valve chamber are in a communicating state, and contacts an inlet of the second discharge flow path or a wall surface of the downstream valve chamber to seal between the second discharge flow path and the first discharge flow path at the second position, and the first discharge flow path and the second discharge flow path are in communication at the first position.)

1. A valve is provided with:

a first valve housing having an inflow port for a pressurized fluid and a valve seat;

a second valve housing having a first discharge flow path and a second discharge flow path for pressurized fluid, and disposed in a stacked manner in the first valve housing;

a diaphragm disposed between the first valve housing and the second valve housing and having a communication port;

a first fixing portion that fixes an outer edge region of the first valve housing and an outer edge region of the second valve housing; and

a second fixing portion that fixes the diaphragm to one of the first valve housing and the second valve housing on an inner side than the first fixing portion in a plan view,

the diaphragm forms an upstream side valve chamber together with the first valve housing, the diaphragm forms a downstream side valve chamber together with the second valve housing, and is movable between a first position and a second position, wherein the first position is a position in which the periphery of the communication port is brought into contact with the valve seat of the first valve housing to bring the upstream valve chamber and the downstream valve chamber into a non-communicating state, the second position is a position at which the periphery of the communication port is separated from the valve seat of the first valve housing to bring the upstream valve chamber and the downstream valve chamber into a communication state, and a second position where the second position contacts an inlet of the second discharge flow path or a wall surface of the downstream side valve chamber to seal between the second discharge flow path and the first discharge flow path, and a first position where the first discharge flow path and the second discharge flow path are communicated.

2. The valve of claim 1,

the second fixing portion fixes the diaphragm to the second valve housing.

3. The valve according to claim 1 or 2,

the valve further includes a third fixing portion that fixes the first valve housing and the second valve housing between the first fixing portion and the second fixing portion in a plan view.

4. The valve according to claim 3,

the first fixing portion and the second fixing portion are double-sided tapes, and the third fixing portion is an adhesive.

5. The valve according to claim 4,

the third fixing portion is a silicon adhesive.

6. The valve according to any one of claims 3 to 5,

the first valve housing has a first opposing surface extending flush from a position of the first fixing portion in contact with the second valve housing to a position of the third fixing portion in contact with the second valve housing, and a second opposing surface recessed from an inner edge portion of the first opposing surface and extending flush with the third fixing portion and the diaphragm with a space therebetween.

7. The valve according to any one of claims 1 to 6,

the diaphragm closes the inlet of the second discharge flow path by contacting the inlet at the second position, thereby sealing a space between the second discharge flow path and the first discharge flow path.

8. A fluid control device is provided with:

the above valve of any one of claims 1 to 7; and

a pump that sends a pressurized fluid to the inlet port of the first valve housing of the valve.

Technical Field

The present invention relates to a valve and a fluid control device provided with the valve.

Background

A fluid control device including a valve has been disclosed (for example, see patent document 1).

The fluid control device of patent document 1 is a fluid control device used for blood pressure measurement, and includes a piezoelectric pump, a valve, and a cuff (cuff). The piezoelectric pump delivers pressurized fluid to the valve, which switches the communication/non-communication of the piezoelectric pump with the cuff. The valve is provided with a diaphragm for switching communication/non-communication. During operation of the piezoelectric pump, the diaphragm is in a communicating position and pressurized fluid delivered from the piezoelectric pump is delivered to the cuff via the valve. When the operation of the piezoelectric pump is stopped, the supply of the pressurized fluid is stopped, and the diaphragm moves to the non-communication position. Since the inside of the valve is opened to the atmospheric pressure, the pressurized fluid stored in the cuff is returned to the valve and discharged to the outside via the valve.

In the fluid control device of patent document 1, a first valve housing and a second valve housing forming an outer shell of the valve are provided. A diaphragm is disposed in an internal space forming the first valve housing and the second valve housing. The diaphragm is held at a predetermined position by being sandwiched vertically between the first valve housing and the second valve housing at the outer edge region thereof. The outer peripheral end of the diaphragm is exposed to the outside of the valve.

Patent document 1 Japanese patent laid-open publication No. 2017-26155

In recent years, there is a demand for improvement in reliability of fluid control devices. In the configuration of patent document 1, when the piezoelectric pump is operated, a high pressure is applied to the center of the diaphragm by the pressurized fluid inside the valve, while a large air pressure is applied to the outer peripheral end of the diaphragm. Since the differential pressure generated in the diaphragm is large as described above, the diaphragm may be gradually deteriorated and the operation of the valve may be deteriorated as the piezoelectric pump is operated. As a result, reliability of the valve and the fluid control device including the valve may be reduced.

Disclosure of Invention

Accordingly, an object of the present invention is to solve the above-described problems and to provide a valve and a fluid control device with improved reliability.

In order to achieve the above object, a valve according to the present invention includes: a first valve housing having an inflow port for a pressurized fluid and a valve seat; a second valve housing having a first discharge flow path and a second discharge flow path for pressurized fluid, and disposed in a stacked manner in the first valve housing; a diaphragm disposed between the first valve housing and the second valve housing and having a communication port; a first fixing portion that fixes an outer edge region of the first valve housing and an outer edge region of the second valve housing; and a second fixing portion that fixes the diaphragm to either the first valve housing or the second valve housing on an inner side than the first fixing portion in a plan view, the diaphragm forming an upstream side valve chamber together with the first valve housing, the diaphragm forming a downstream side valve chamber together with the second valve housing and being movable between a first position and a second position, the first position being a position in which a periphery of the communication port is brought into contact with the valve seat of the first valve housing to bring the upstream side valve chamber and the downstream side valve chamber into a non-communication state, the second position being a position in which a periphery of the communication port is separated from the valve seat of the first valve housing to bring the upstream side valve chamber and the downstream side valve chamber into a communication state, the second position being a position in which the periphery of the communication port is brought into contact with an inlet of the second discharge flow path or a wall surface of the downstream side valve chamber to bring the second discharge flow path and the first discharge flow path into contact with the inlet of the second discharge flow path or the wall surface of the downstream side valve chamber And an intermediate seal for communicating the first discharge flow path and the second discharge flow path at the first position.

Further, the fluid control device of the present invention includes: the above-mentioned valve; and a pump for feeding a pressurized fluid to the inlet port of the first valve housing of the valve.

According to the valve and the fluid control device of the present invention, reliability can be improved.

Drawings

Fig. 1 is an upper perspective view of a fluid control device.

Fig. 2 is a lower perspective view of the fluid control device.

Fig. 3 is an exploded perspective view of the fluid control device.

Fig. 4 is a longitudinal sectional view showing a non-operating state before the fluid control device is operated.

Fig. 5A is an enlarged partial cross-sectional view of the valve.

Fig. 5B is a cross-sectional view C-C of fig. 4.

Fig. 6A is a longitudinal sectional view (a communication state, a second position) for explaining the operation of the fluid control device.

Fig. 6B is a longitudinal sectional view (non-communication state, first position) for explaining the operation of the fluid control device.

Detailed Description

According to a first aspect of the present invention, there is provided a valve comprising: a first valve housing having an inflow port for a pressurized fluid and a valve seat; a second valve housing having a first discharge flow path and a second discharge flow path for pressurized fluid, and disposed in a stacked manner in the first valve housing; a diaphragm disposed between the first valve housing and the second valve housing and having a communication port; a first fixing portion that fixes an outer edge region of the first valve housing and an outer edge region of the second valve housing; and a second fixing portion that fixes the diaphragm to either one of the first valve housing and the second valve housing on an inner side than the first fixing portion in a plan view, the diaphragm forming an upstream side valve chamber together with the first valve housing and a downstream side valve chamber together with the second valve housing and being movable between a first position at which a periphery of the communication port is brought into contact with the valve seat of the first valve housing to bring the upstream side valve chamber and the downstream side valve chamber into a non-communicating state and a second position at which a periphery of the communication port is separated from the valve seat of the first valve housing to bring the upstream side valve chamber and the downstream side valve chamber into a communicating state, the second fixing portion being brought into contact with an inlet of the second discharge flow path or a wall surface of the downstream side valve chamber to seal between the second discharge flow path and the first discharge flow path, and a second discharge flow path that communicates with the first discharge flow path.

According to this configuration, the diaphragm is fixed to the inner side of the first fixing portion, and therefore, the diaphragm is not exposed to the outside of the valve housing, and the differential pressure applied to the surface of the diaphragm is smaller than in the case where the diaphragm is exposed to the outside of the valve housing. This can suppress damage to the separator and prolong the life of the separator.

According to the valve described in the first aspect, a second aspect of the present invention provides the valve, wherein the second fixing portion fixes the diaphragm to the second valve housing. According to such a configuration, when the diaphragm is fixed to the second valve housing, the valve seat of the first valve housing is less likely to be an obstacle, and the diaphragm can be easily manufactured.

According to the valve described in the first or second aspect, a third aspect of the present invention provides the valve further comprising a third fixing portion that fixes the first valve housing and the second valve housing between the first fixing portion and the second fixing portion in a plan view. According to this configuration, the third fixing portion can more firmly fix the first valve housing and the second valve housing. In addition, the materials used for the first fixing portion, the second fixing portion, and the third fixing portion can be used separately.

According to the valve described in the third aspect, in the fourth aspect of the present invention, there is provided the valve, wherein the first fixing portion and the second fixing portion are double-sided tapes, and the third fixing portion is an adhesive. With this configuration, the double-sided tapes of the first and second fixing portions are easily positioned, and the adhesive force of the adhesive of the third fixing portion is strong. In addition, since the adhesive of the third fixing portion is blocked by the first fixing portion and the second fixing portion, the third fixing portion can be arranged at a desired position.

According to a fifth aspect of the present invention, there is provided the valve according to the fourth aspect, wherein the third fixing portion is a silicon adhesive. With this configuration, it is possible to reduce manufacturing costs by using a general-purpose material.

A sixth aspect of the present invention provides the valve according to any one of the third to fifth aspects, wherein the first valve housing has a first facing surface extending flush from a position of the first fixing portion in contact with the second valve housing to a position of the third fixing portion in contact with the second valve housing, and a second facing surface recessed from an inner edge portion of the first facing surface and extending flush with the third fixing portion and the diaphragm with a space therebetween. According to this configuration, by providing the step between the first opposing surface and the second opposing surface, even when the amount of the adhesive of the third fixing portion is large, a space through which the third fixing portion escapes can be secured.

A seventh aspect of the present invention provides the valve according to any one of the first to sixth aspects, wherein the diaphragm seals between the second discharge flow path and the first discharge flow path by contacting the inlet of the second discharge flow path at the second position to block the inlet. With this configuration, when the diaphragm is in the second position, the second discharge flow path and the first discharge flow path can be sealed with high accuracy.

According to an eighth aspect of the present invention, there is provided a fluid control device including the valve according to any one of the first to seventh aspects; and a pump for feeding a pressurized fluid to the inlet port of the first valve housing of the valve. According to this configuration, the diaphragm is fixed to the inner side of the first fixing portion, and therefore is not exposed to the outside of the valve housing, and the differential pressure applied to the surface of the diaphragm is smaller than in the case where the diaphragm is exposed to the outside of the valve housing. This can suppress damage to the separator and prolong the life of the separator.

(embodiment mode)

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

< integral Structure >

Fig. 1 to 4 are schematic diagrams showing a fluid control device 2 according to an embodiment. Fig. 1 is an upper perspective view of the fluid control device 2, and fig. 2 is a lower perspective view of the fluid control device 2. Fig. 3 is an exploded perspective view of the fluid control device 2, and fig. 4 is a longitudinal sectional view of the fluid control device 2. Fig. 4 shows a non-operating state in which the fluid control device 2 is not operated.

The fluid control device 2 is a device that sucks fluid (air in the embodiment) from the suction port 24 (fig. 2), pressurizes the sucked fluid to generate pressurized fluid, and controls the generated pressurized fluid to be discharged from the discharge flow path 52 (fig. 1). As shown in fig. 1 to 3, the fluid control device 2 includes a pump 4 and a valve 6.

As shown in fig. 4, the fluid control device 2 of the present embodiment is used in a blood pressure measurement device 3 for measuring the blood pressure of a human. The blood pressure measurement device 3 includes a cuff 8 in addition to the fluid control device 2. The cuff 8 is inflated by the pressurized fluid supplied from the fluid control device 2, and functions as an air bladder for blood pressure measurement.

The pump 4 has a structure for sucking fluid from a suction port 24 shown in fig. 2 to generate pressurized fluid and sending the pressurized fluid to the valve 6. The valve 6 has a structure capable of switching between a mode of feeding the pressurized fluid fed from the pump 4 into the cuff 8 from the discharge flow path 52 and a mode of discharging the pressurized fluid stored in the cuff 8 without supplying the pressurized fluid to the cuff 8.

The detailed configurations of the pump 4 and the valve 6 will be described in order below.

As shown in fig. 3, the pump 4 includes a cover 10, a flow path plate 12, a thin top plate 14, a spring plate 16, a piezoelectric body 18, an insulating plate 20, and a power supply plate 22.

The cover 10 is a member forming a plurality of suction ports 24. The cover 10 is adhered to the flow path plate 12. The flow path plate 12 is a member forming a flow path 26 communicating with the suction port 24. The flow channel plate 12 is attached to the thin top plate 14. The thin top plate 14 is a member forming an opening 28 communicating with the flow path 26. The spring plate 16 is a member having an outer peripheral portion attached to the thin top plate 14, and includes a vibrating portion 30, a frame portion 32, and a connecting portion 34. The coupling portion 34 is a member that elastically supports the vibrating portion 30 and the frame portion 32 while coupling them.

The piezoelectric body 18 is attached to the vibrating portion 30. The piezoelectric body 18 is a member that bends and vibrates when a voltage is applied thereto. By providing the piezoelectric body 18, the pump 4 functions as a piezoelectric pump.

The insulating plate 20 is attached to the frame 32 of the spring plate 16. The power supply plate 22 is attached to the insulating plate 20 and includes a terminal 36. The terminal 36 is electrically connected to the piezoelectric body 18, and can apply a voltage to the piezoelectric body 18.

With this configuration, when the pump 4 is operated and a voltage is applied to the piezoelectric body 18 via the terminal 36, the piezoelectric body 18 and the vibrating portion 30 of the spring plate 16 vibrate in a bending manner (for example, at about 23 kHz). Thereby, the pressure of the internal space of the pump 4 shown in fig. 4 rises. As the pressure rises, air at atmospheric pressure outside the pump 4 is drawn into the pump 4 from the suction port 24. The air sucked into the pump 4 is pressurized to become a pressurized fluid. The pressurized fluid generated by the pump 4 is fed into the valve 6.

As shown in fig. 3, the valve 6 includes a first valve housing 38, a second valve housing 40, a diaphragm 42, a first fixing portion 44, and a second fixing portion 46.

The first valve housing 38 and the second valve housing 40 are each a component constituting an outer shell of the valve 6. The first valve housing 38 has an inflow port 48 and a valve seat 50 (fig. 4). The first valve housing 38 is bonded to the power supply plate 22 of the pump 4 by an adhesive 49 (fig. 4). The second valve housing 40 is a member that forms a first discharge flow path 52 and a second discharge flow path 54. The first valve housing 38 and the second valve housing 40 are disposed one on top of the other.

In the present embodiment, the first valve housing 38 and the second valve housing 40 are both formed of metal.

The first valve housing 38 and the second valve housing 40 are fixed to each other by a first fixing portion 44 shown in fig. 3 and the like. A diaphragm 42 is disposed in an internal space formed by the first valve housing 38 and the second valve housing 40.

The diaphragm 42 is a member that divides an internal space formed by the first valve housing 38 and the second valve housing 40 into 2 spaces (valve chambers). As shown in fig. 4, an upstream side valve chamber (upstream side space) a is formed between the diaphragm 42 and the first valve housing 38, and a downstream side valve chamber (downstream side space) B is formed between the diaphragm and the second valve housing 40.

The diaphragm 42 has a communication port 56 in the central portion. In the non-operating state shown in fig. 4, the periphery of the communication port 56 of the diaphragm 42 is in contact with and sealed against the valve seat 50 of the first valve housing 38. At this time, the upstream valve chamber a and the downstream valve chamber B are in a non-communicating state where they do not communicate with each other. The diaphragm 42 can move from the non-communication position shown in fig. 4 to a communication position where the upstream valve chamber a and the downstream valve chamber B communicate with each other. The specific operation of the diaphragm 42 will be described later.