JPS5814972B2 - Fluid pressure detection element and valve device using it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection element for detecting fluctuations in fluid pressure and a fluid pressure responsive valve device using the detection element.

The applicant has already held a magnetic sphere inside a cylindrical magnet in such a way that it is balanced by its own weight and the magnetic force at the upper and lower ends of the cylindrical magnet, and the magnetic sphere is made magnetic by vibration, mechanical displacement from the outside, magnetic displacement, etc. As the magnetic force balance of the sphere becomes unbalanced, the magnetic force at the upper end of the cylindrical magnet acts strongly and moves the magnetic sphere upward, causing movement of the magnetic sphere of the vibration sensing element and the vibration sensing element. We have developed a seismic valve device that uses displacement to close the valve.

Recently, there has been a demand for devices that sense minute changes in fluid pressure and perform various mechanical displacement operations as elements for various control devices, but there is still no reliable device with a relatively simple configuration. Not proposed.

Therefore, by applying the above-mentioned vibration-sensing element developed by the applicant as an element that satisfies these demands, the applicant succeeded in developing a highly reliable element that detects minute pressure changes and generates mechanical displacement, and has obtained a patent. I filed an application.

However, when this type of vibration sensing element is applied, it has the advantage of being able to respond sensitively to vibrations as well as minute pressure changes, but on the other hand, the cylindrical magnet and the magnetic sphere placed inside it are always in a vertical state. There was a drawback that stable operation could not be achieved unless the settings were maintained.

Therefore, as a result of further intensive research, the inventor arranged a pair of annular magnets concentrically and spaced apart so as to exert a mutually repelling magnetic field, and a cylindrical magnet was loosely fitted inside these annular magnets.
By configuring this cylindrical magnet so that its magnetic force is balanced with one of the annular magnets in a repulsive relationship, mechanical displacement or magnetic force displacement can be applied to this cylindrical magnet based on changes in the pressure of the fluid. It has been found that the magnetic force balance is lost and the cylindrical magnet can be displaced in a direction in which it balances with the other annular magnet which is in an attractive relationship.

That is, by configuring the detection mechanism in this way,
Proper operation can be achieved even if the arrangement of the annular magnet and cylindrical magnet is tilted in any direction, and as a result, it is possible to expand the range of applications by eliminating restrictions on the mounting location of the detection element, etc. It became Karinō.

Therefore, a fluid chamber is provided adjacent to one of the annular magnets that holds the cylindrical magnet under balance of magnetic force, and a diaphragm that is displaced by changes in fluid pressure is disposed within this fluid chamber. Attach a protruding rod or a magnet, displace the diaphragm by changing the fluid pressure in the fluid chamber, and use the displacement of the diaphragm to act on the protruding rod or the magnet, so that the cylindrical magnet in a balanced state is aligned with the other annular magnet. It has been found that by shifting to a balanced state, it is possible to obtain a highly reliable sensing element that detects minute pressure changes and generates mechanical displacement.

In addition, by using an element configured in this way, if the valve body is directly displaced by the cylindrical magnet of the element, automatic retrospective control of the valve can be reliably achieved based on minute pressure changes in the fluid. It turns out it can be done.

A general object of the present invention is to provide a fluid pressure sensing element that has a simple structure and can generate reliable mechanical displacement based on changes in fluid pressure, and a valve device using the same.

In order to achieve the above object, the present invention provides a fluid chamber defined into upper and lower 2' chambers by a diaphragm that is displaced by changes in fluid pressure, and at least a non-magnetic annular member is provided in the upper part of the fluid chamber. An annular joint in which a pair of annular magnets are arranged concentrically and spaced apart is provided, a cylindrical magnet is loosely fitted inside the annular joint, and this magnet is held in a balance of magnetic force with respect to the annular magnet below, A member that directly or indirectly displaces the cylindrical magnet is provided in a part of the diaphragm in the fluid chamber, and a fluid pressure to be detected is applied to one chamber defined by the diaphragm of the fluid chamber. It is characterized by configuring.

In the fluid pressure detection element configured as described above, a through hole is provided in the fluid chamber, and a protruding rod is provided which is integrally connected to the diaphragm that contacts the cylindrical magnet through the through hole. The cylindrical magnet can be configured to be directly suppressed and displaced under the action of the cylindrical magnet.

Alternatively, it is also possible to arrange a magnet in a part of the diaphragm of the fluid chamber so that under the action of any magnet, the cylindrical magnet loses its magnetic balance.

In addition, a holding plate is brought into contact adjacent to one of the annular magnets that holds the cylindrical magnet under a balance of magnetic force, and a space is provided between the holding plate and the fluid chamber, and the cylindrical magnet and the cylindrical magnet are placed in the space. It is also possible to provide a first magnet that acts repulsively, and further provide a second magnet that acts repulsively to the first magnet in a part of the diaphragm of the fluid chamber.

In this case, a reliable response can be achieved by drilling a through hole in the holding plate and providing a protruding rod that is integrally coupled with the first magnet that abuts the cylindrical magnet through the through hole.

The fluid chamber is preferably used in such a way that positive pressure or negative pressure is applied to one chamber partitioned by a diaphragm, and the other chamber is communicated with the atmosphere, and the diaphragm is displaced by the action of the positive pressure or negative pressure. be.

Note that the fluid chamber is an atmospheric release chamber that is equipped with a valve device so that when negative pressure is applied to one chamber partitioned by a diaphragm and the other chamber is communicated with the atmosphere, the fluid chamber communicates with the fluid chamber where negative pressure acts. If a pipe is provided and the valve device is configured to be controlled by different signal sources, the element can be reset regardless of fluid pressure fluctuations, and the element can be provided with many functions.

It is also possible to use a method of displacing the diaphragm by applying different signal pressures to each chamber partitioned by the diaphragm of the fluid chamber.

Furthermore, in the present invention, a fluid pressure sensing element configured as described above is used, and the lower end of the valve stem of the valve device is engaged with the cylindrical magnet of this element, and the flow It is an object of the present invention to provide a fluid pressure responsive valve device characterized in that a valve body for opening and closing a passage is connected.

Next, embodiments of a fluid pressure detection element and a valve device using the same according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the fluid pressure detection element according to the present invention, which includes two annular magnets 10a.

10b are concentrically joined with an annular member 12 made of a non-magnetic material interposed therebetween to form an annular joined body. 14 loosely fit.

In this case, the annular magnets 10aylOb are configured and arranged so as to mutually exert a repulsive magnetic field, and one magnet 10a and the cylindrical magnet 14 are in a repulsive relationship, so that the bisector 11 of the cylindrical magnet 14 is the same as that of the annular magnet 10a. It is maintained by the balance of magnetic force in a state displaced by a predetermined dimension Δl from the bisector 12 of .

Therefore, with this configuration, the cylindrical magnet 1
By applying a mechanical displacement or a magnetic force to the cylindrical magnet 4, the magnetic force balance of the cylindrical magnet 14 is lost, and the cylindrical magnet 14 can be shifted toward the other annular magnet 10b which is in an attractive relationship.

In this embodiment, in order to ensure that the cylindrical magnet 14 is held at both end portions of the annular magnets 10a and 10b, the annular magnet 10a of the cylindrical magnet 14 is fixed.

It is preferable to concentrically join annular members 16 and 18 made of a non-magnetic material with dimensions that allow displacement relative to 10b.

A fluid chamber 20 is provided adjacent to one of the annular members 18 of the assembled body including the annular magnets 10a and 10b configured in this way, and a flexible diaphragm 22 is stretched inside the fluid chamber 20.
Define the room.

However, one compartment 20a is provided with a through hole 24 to communicate with the atmosphere, and the other compartment 20b communicates with a pressure signal source 26 to constitute a fluid pressure chamber.
8 and the protruding rod 28 is inserted through a through hole 30 formed in the center of the fluid chamber 20 so as to face the cylindrical magnet 14 so as to be able to come into contact with it.

Therefore, when a required positive pressure is applied to the fluid pressure chamber 20b, the diaphragm 22 is displaced in the direction of the arrow, and as a result, the protruding rod 28 comes into contact with the cylindrical magnet 14 and moves it, and the cylindrical magnet 14 becomes a magnet. It loses its balance and shifts to the other stable state.

FIG. 2 shows another embodiment of the fluid pressure detection element according to the present invention, in which, instead of the protruding rod 28 acting on the cylindrical magnet 14, a part of the diaphragm 22 has a cylindrical magnet 14 acting on the repulsive force. A magnet 32 is attached.

In this case, if a required positive pressure acts on the fluid pressure chamber 20b, the diaphragm 22 will be displaced in the direction of the arrow, and as a result, the magnet 32 will approach the cylindrical magnet 14 and lose its magnetic balance, unlike the embodiment described above. Similarly, a transposition of the cylindrical magnet 14 can be achieved.

FIG. 3 shows another embodiment of the fluid pressure detection element according to the present invention, in which a holding plate 34 holding the cylindrical magnet 14 is provided at the further side end of the annular member 18 joined to one of the annular magnets 10a. A space chamber 36 is formed between this holding plate 34 and the fluid chamber 20, and a first magnet 38 that acts repulsively with the cylindrical magnet 14 is moved toward and away from the holding plate 34 in this space chamber 36. Arrange as you like.

On the other hand, a second magnet 40 is attached to a part of the diaphragm 22 stretched inside the fluid chamber 20 so as to generate a repelling magnetic field with the first magnet 38.

Therefore, in this embodiment as well, when a required positive pressure is applied to the fluid pressure chamber 20b, the diaphragm 22 is displaced in the direction of the arrow.
As a result, the second magnet 40 approaches the first magnet 38 to repel it, and the first magnet 38 approaches the bottom of the holding plate 34, causing the cylindrical magnet 14 to lose its magnetic balance.

FIG. 4 shows a modification of the fluid pressure detection element shown in FIG. A protruding rod 44 connected to one magnet 38 is inserted through the rod so that its tip faces the cylindrical magnet 14 so that it can come into contact with it.

With this configuration, the magnetic force balance of the cylindrical magnet 14 can be lost due to the action of the protruding rod 44 as the first magnet 38 moves, and the operation becomes more reliable.

FIG. 5 shows still another embodiment of the fluid pressure detection element according to the present invention. In the above embodiment, a case where positive pressure is applied to the fluid chamber 20 has been described, but negative pressure is applied to the fluid chamber 20. In this case, one compartment 20a is communicated with the atmosphere and the other compartment 20b is communicated with the pressure signal source 26 to form a fluid pressure chamber.

In this case, negative pressure acts on the fluid pressure chamber 20b and the diaphragm 22
If the second magnet 40 is set to displace downward and no longer exerts a repulsive magnetic field to the first magnet 38 (at this time, the cylindrical magnet 14 is set to be reset), pressure fluctuations will occur in the pressure signal source 26. When this occurs, the diaphragm 22 is displaced in the direction of the arrow, and as a result, the cylindrical magnet 14 can be configured to lose its magnetic balance as in the previous embodiment.

Note that in this embodiment, the diaphragm 22 is connected to the second magnet 400.
It is preferable to provide a repulsive member 46 such as a spring or a magnet within the fluid pressure chamber 20b so that the cylindrical magnet 14 is returned in the direction of setting (in the direction of the arrow).

Further, in the embodiment shown in FIG. 5, the fluid pressure chamber 20b
An atmosphere release pipe 48 provided with a valve device 47 is connected to the wall surface of the fluid chamber 20 constituting the fluid chamber 20 or a communication pipe with the pressure signal source 26 at an appropriate location, and the valve device 47 is controlled by another signal source. Accordingly, the inside of the fluid pressure chamber 20b can be immediately brought to atmospheric pressure regardless of pressure fluctuations of the pressure signal source 26, and the element can be reset.

Therefore, with this configuration, the fluid pressure detection element according to the present invention can be provided with many functions, and its uses can be expanded.

In the fluid pressure detection element according to the present invention, when pressure from different pressure signal sources 26 is applied to the two fluid chambers defined by the diaphragm 22 and a pressure difference is generated, the diaphragm 22 is displaced and the element is can be configured to operate.

The fluid pressure detection element according to the present invention maintains a predetermined balanced state with an annular magnet by directly applying mechanical displacement or magnetic force to the cylindrical magnet using the displacement of the diaphragm 22 due to changes in fluid pressure. The cylindrical magnet 14 can be shifted to another balanced state, and the mechanical displacement of the cylindrical magnet 14 can be used to incorporate it into various control devices to achieve various types of control. .

Note that resetting the dislocated cylindrical magnet 14 to its original state can be accomplished by appropriate mechanical means.

FIG. 6 shows an embodiment in which the fluid pressure detection element configured as described above is applied as an automatic closing control device for a valve device, in which the fluid pressure detection element according to the present invention is integrated in the lower part of the valve casing 50. The lower end of the valve stem 52 is engaged with the upper part of the cylindrical magnet 14, and the valve seat 54 is attached to a part of the valve stem 52.
A valve element 56 is connected to the valve element 56, which opens and closes the flow path.

With this configuration, the cylindrical magnet 14 is affected by a change in fluid pressure within the fluid chamber 20 of the fluid pressure detection element.
When the valve body 56 is displaced upward, the valve body 56 seats on the valve seat 54 and can shut off the flow path.

Therefore, according to the present invention, it is possible to obtain a valve device that directly performs a shutoff operation in response to changes in fluid pressure.

The fluid pressure detection element according to the present invention and the valve device using the same have advantages such as being simple in structure and easy to manufacture, and also having reliable operation and a long life since it is constructed by combining magnets. has.

In addition, the diaphragm stretched in the fluid chamber that senses pressure changes in the fluid can be extremely sensitive to pressure changes, making it possible to sense even minute pressure changes. By reducing the weight of the magnet material, a detection element and valve device with high sensitivity and reliability can be obtained.

Furthermore, the fluid pressure detection element according to the present invention can achieve a reliable response even if the annular magnet assembly is arranged inclined in any direction with respect to the horizontal plane. It is easy to handle, as the mounting location can be set arbitrarily.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a fluid pressure detection element according to the present invention, FIG. 2 is a cross-sectional view of main parts showing another embodiment, and FIG.
The figure is a cross-sectional view of a main part showing still another embodiment, FIGS. 4 and 5 are cross-sectional views of a main part showing a modification of the detection element shown in FIG. 3, and FIG. FIG. 6 is a sectional view showing an embodiment of a valve device using a detection element according to the present invention. 10... Annular magnet, 12... Annular member, 14... Cylindrical magnet, 16, 18...
・Annular member, 20...Fluid chamber, 22...
・Diaphragm, 24...Through hole, 26...Pressure signal source, 28...Protruding rod, 30...Through hole, 32... Magnet, 34... Holding plate, 3
6... Space chamber, 38... First magnet, 4
0...Second magnet, 42...Through hole, 44
...Protruding rod, 46 ... Repulsion member, 47
... Valve device, 48 ... Atmospheric release pipe, 5
0... Valve casing, 52... Valve stem, 5
4... Valve seat, 56... Valve body.

Claims (1)

[Claims] 1. A fluid chamber defined into two upper and lower chambers is provided by a diaphragm that changes with changes in fluid pressure, and at least a pair of annular magnets are concentrically connected to the upper part of this fluid chamber via a non-magnetic annular member. A cylindrical magnet is loosely fitted into the annular joint, and the magnet is held in a balanced manner with respect to the annular magnet below, and one of the diaphragms in the fluid chamber is The cylindrical magnet is provided with a member that directly or indirectly displaces the cylindrical magnet, and is further configured to apply fluid pressure to be detected to one chamber defined by a diaphragm of the fluid chamber. Fluid pressure detection element. 2. The member that directly displaces the cylindrical magnet consists of a protruding rod that is integrally combined with the diaphragm, and the tip of the protruding rod is in direct contact with the cylindrical magnet through a through hole provided in the fluid chamber. A fluid pressure detecting element according to claim 1, which is configured and arranged. 3. The fluid pressure detection element according to claim 1, wherein the member that indirectly applies displacement to the cylindrical magnet is a magnet disposed on a part of the diaphragm. 4. The member that indirectly displaces the cylindrical magnet has a space between the fluid chamber and the annular joined body, and a first magnet that acts repulsively with the cylindrical magnet is housed in this space, and 2. The fluid pressure detection element according to claim 1, further comprising a second magnet provided in a part of the diaphragm of the fluid chamber to act in repulsive action with the first magnet. 5. The fluid according to claim 4, wherein the first magnet is provided with a protruding rod, and the tip of the protruding rod is configured and arranged so as to directly contact the cylindrical magnet through a through hole provided in the space. Pressure detection element. 6. An annular joint in which a fluid chamber defined into two upper and lower chambers is provided by a diaphragm that is displaced by a change in fluid pressure, and at least a pair of annular magnets are arranged concentrically and spaced apart above the fluid chamber via a non-magnetic annular member. A cylindrical magnet is loosely fitted inside this annular joint body to hold this magnet under balance of magnetic force with respect to the annular magnet below, and the cylindrical magnet is attached to a part of the diaphragm in the fluid chamber. A fluid pressure detection element is constructed by providing a member that directly or indirectly displaces the fluid chamber, and applying fluid pressure to be detected to one chamber defined by a diaphragm of the fluid chamber. A fluid pressure detection element is disposed at the lower part of the valve device, and the lower end of the valve stem of this valve device is engaged with a cylindrical magnet, and a part of the valve stem is caught in the upward movement of the cylindrical magnet, resulting in blockage of the flow path. A fluid pressure responsive valve device characterized by being provided with a valve body that performs.