JP6741292B2 - Electromagnetic vibration type diaphragm pump - Google Patents

Description

The present invention relates to an electromagnetic vibration type diaphragm pump.

A vibrator having a magnet is reciprocally driven by alternating current of an electromagnet to vibrate diaphragms fixed to both ends of the vibrator, thereby sucking and discharging a fluid such as gas or liquid. For example, an electromagnetic vibration diaphragm. Pumps are known. For example, in Patent Document 1, a vibrator to which a magnet such as a permanent magnet is fixed, a diaphragm made of rubber or the like provided at both ends of the vibrator, and an electromagnet arranged to face the magnet are provided. There is disclosed an electromagnetic vibration type diaphragm pump in which these are housed inside a metal casing.

In the case of such an electromagnetic vibration type diaphragm pump, an opening is provided outside the portion where the diaphragm is arranged in order to assemble the parts such as the above-mentioned vibrator in the case or to replace the parts at the time of maintenance. Has been formed. Then, the housing forms a closed space by being fixed in a state where the opening is covered with the metallic lid.

JP, 2008-150959, A

Such a housing is often made of a metal material. The inside of the housing is a portion that comes into contact with water or water vapor (hereinafter collectively referred to as “fluid”), and a metal housing may be corroded. Therefore, it is conceivable to form the housing with a resin material instead of the metal housing. However, in this case, a problem occurs in the fastening force between the housing and the lid. That is, in a normal fixing method using a screw, an insert nut, or the like, the fastening force decreases due to the creep phenomenon peculiar to the resin, and the fluid may leak from the housing.

Therefore, an object of the present invention is to provide an electromagnetic vibration type diaphragm pump capable of reducing corrosion of a housing due to a fluid and maintaining airtightness inside the housing.

The electromagnetic vibration type diaphragm pump of the present invention includes a vibrator to which a magnet is fixed, an electromagnet provided to face the magnet of the vibrator and reciprocating the vibrator in one direction, and at least one end in one direction of the vibrator. An electromagnetic vibration type diaphragm pump comprising a diaphragm provided in a section, and a housing for accommodating a vibrator, an electromagnet and a diaphragm, which accommodates the vibrator, diaphragm and electromagnet, and A housing having at least one opening through which one end can enter, a housing formed of resin, a lid formed of resin and covering the opening, and a pair of holding the lid together with the housing. The pair of sandwiching parts, which include the sandwiching part and the fastening part that fastens the sandwiching parts together and are fastened by the fastening parts, press the lid body against the housing in one direction.

Since the casing of the electromagnetic vibration type diaphragm pump is made of resin, corrosion can be reduced as compared with the casing made of a metal material. Further, the lid body is pressed in one direction with respect to the housing by the pair of holding portions that are fastened by the fastening portion, thereby covering the opening portion. That is, since the lid is fixed to the housing without using screws or insert nuts, the creeping force peculiar to the resin does not lower the fastening force and the fluid does not leak from the housing. As a result, the corrosion of the housing due to the fluid can be reduced and the airtightness inside the housing can be maintained.

The sandwiching portion may be formed of a metal material in a portion that is fastened to each other by the fastening portion and a portion that is in contact with each other. This electromagnetic vibration type diaphragm pump can reduce the looseness of the fastening portion.

The lid may have elasticity. In this electromagnetic vibration type diaphragm pump, since the close contact between the lid and the housing is enhanced, the airtightness inside the housing can be further enhanced.

The electromagnetic vibration type diaphragm pump further includes a holding member that holds the diaphragm, the housing has a positioning portion that can fit the holding member inside the opening in one direction, and the lid body has the positioning portion. The opening may be covered in a state of being in contact with the holding member in a state fitted with.

The holding member has a rib protruding in one direction and a boss protruding in one direction from the rib, the lid body has an insertion portion through which the boss can be inserted, and the boss is inserted into the insertion portion. The rib may be in contact with the sandwiching portion in the closed state, and the rib may be sandwiched in the lid body with the sandwiching portion. In this electromagnetic vibration type diaphragm pump, the holding member is pressed firmly to the inside of the housing by the holding portion via the boss, so that the holding member is firmly fixed. Further, since the lid body is sandwiched between the sandwiching portion and the rib, it is possible to prevent the fluid from leaking out from the inside of the housing to the sandwiching portion side, and particularly the effect of suppressing the liquid is high.

A seal member that is sandwiched between the housing and the sandwiching portion and that is made of a frame-shaped elastic material that is larger than the outer shape of the lid may be further included. In this electromagnetic vibration type diaphragm pump, it is possible to effectively prevent the fluid from leaking out from the inside of the housing, and in particular, the effect of suppressing gas is high.

According to the present invention, it is possible to reduce corrosion of a housing due to a fluid and to maintain airtightness inside the housing.

It is an exploded perspective view showing an electromagnetic vibration type diaphragm pump of one embodiment. It is a perspective view which shows the housing|casing of FIG. It is a perspective view which shows the clamping part of FIG. It is a perspective view which shows the housing|casing clamped by the clamping part in FIG. It is a front view which shows the holding member of FIG. (A) It is a front view which shows the 1st sealing member fixed to the holding member of FIG. (B) It is sectional drawing which expands and shows the holding member to which the 1st sealing member of FIG. 1 was fixed. It is a perspective view which shows the holding part used for the electromagnetic vibration type diaphragm pump which concerns on a modification.

Hereinafter, an electromagnetic vibration type diaphragm pump 1 (hereinafter, simply referred to as “diaphragm pump 1”) according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

As shown in FIG. 1, the diaphragm pump 1 includes an electromagnet 3, a vibrator 4, a diaphragm 5, a sub-frame (housing) 30, a main frame (a pair of holding portions) 10, and a holding member 40. A first seal member (lid body) 50 and a second seal member 60 are provided.

The electromagnets 3 are arranged to face the main surface of the support member 4A of the vibrator 4, respectively. The electromagnet 3 is driven by, for example, an alternating current. The electromagnet 3 has an exciting coil formed by winding an electric wire around an iron core. When an alternating current flows in the exciting coil, the polarity appearing in the core changes depending on the phase of the alternating current. The pair of electromagnets 3 are formed so as to have opposite polarities.

The vibrator 4 has a support member 4A extending in one direction D and a magnet 4B. The support member 4A is a plate-shaped body made of, for example, a non-magnetic material. The magnets 4B, 4B are, for example, permanent magnets, and two magnets are arranged so that the S pole and the N pole appear on the respective main surfaces of the support member 4A.

The diaphragms 5 are provided at both ends in one direction D of the vibrator 4. Specifically, the diaphragm 5 is fixed to the sub-frame 30 while being held by the holding member 40 described in detail later. The diaphragm 5 is formed into a circular plate-like body by using an elastic material such as polyethylene propylene rubber (EPDM), fluororubber, silicon (Si), natural rubber (NR), or nitrile rubber (NBR). Has been done.

As shown in FIGS. 1 and 2, the sub-frame 30 is made of a resin material such as PPS (polyphenylene sulfide resin) in consideration of water resistance and temperature resistance, and includes the electromagnet 3, the vibrator 4, and the diaphragm 5. Is formed so that it can be accommodated. Note that the subframe 30 may be formed of a resin material such as PBT (polybutylene terephthalate resin), ABS resin, PP (polypropylene) other than the above PPS. The sub-frame 30 includes a main body 31, a pair of first openings (openings) 31A and 31A, a positioning portion 35, a second opening 37, a cover 37A, a suction pipe 38A, and a discharge pipe 38B. , A suction chamber (not shown) and a discharge chamber (not shown).

The main body portion 31 is formed in a tubular shape, and a pair of first ends 4C, 4C of the oscillator 4 can enter into both ends of the oscillator 4 in the reciprocating direction (one direction D). Openings 31A and 31A are formed. The positioning portion 35 is formed inside the first openings 31A, 31A in the one direction D so that the holding member 40 described later in detail can be fitted therein. The inner peripheral surface 34A of the positioning portion 35 is formed to be slightly larger than the outer peripheral surface 40A of the holding member 40. The positioning part 35 is a part for fixing the holding member 40. The second opening 37 is formed in a size that allows an electromagnet unit including the pair of electromagnets 3 to be inserted therethrough. The second opening 37 is covered with a cover 37A. The cover 37A is fixed to the main body 31 with bolts 37B or the like.

As shown in FIGS. 1 and 5, the holding member 40 includes a body portion 41, an insertion hole 41A, a boss 42, a rib 43, a partition portion 44, a suction valve 45, and a discharge valve 46. Have An insertion hole 41A is formed in the main body portion 41 and penetrates in the thickness direction (one direction D) of the main body portion 41. The diaphragm 5 is arranged in the insertion hole 41A. Specifically, the diaphragm 5 is fixed by sandwiching an inner center plate 5B and an outer center plate 5D made of resin or metal via spacers 5A and 5C, respectively.

As shown in FIGS. 5 and 6, the boss 42 projects from the main body 41 in the one direction D and has a cylindrical shape. Six bosses 42 are formed on the main body 41 of the present embodiment. A rib 43 surrounding the boss 42 is formed on the outer peripheral side of the boss 42. The rib 43 projects from the main body 41 in the one direction D and has a cylindrical shape. Six ribs 43 are formed on the main body 41 of the present embodiment. The boss 42 has a larger amount of protrusion from the main body 41 than the rib 43. The boss 42 and the rib 43 are integrally formed with the main body 41. The partition portion 44 projects from the main body portion 41 in the one direction D and has a plate shape. The partition portion 44 is formed so as to surround the insertion hole 41A, the suction valve 45, and the discharge valve 46, and the compression chamber 47 is formed by the space surrounded by the first seal member 50, the partition portion 44, and the main body portion 41. To be done.

The suction valve 45 is arranged between a suction chamber formed in the subframe 30 and a compression chamber 47. The suction valve 45 is a valve that opens when the pressure of the compression chamber 47 becomes lower than that of the suction chamber, and allows the fluid to flow from the suction chamber to the compression chamber 47 in one direction. The discharge valve 46 is arranged between the discharge chamber formed in the main body 31 and the compression chamber 47. The discharge valve 46 is a valve that opens when the pressure in the compression chamber 47 becomes higher than that in the discharge chamber, and allows the fluid to flow from the compression chamber 47 to the discharge chamber in one direction. That is, the fluid sucked through the suction pipe 38</b>A by the diaphragm vibrating by the reciprocating motion of the vibrator 4 enters the compression chamber 47 from the suction chamber via the suction valve 45. Next, the fluid sucked into the compression chamber 47 enters the discharge chamber from the compression chamber 47 via the discharge valve 46, and is discharged from the discharge chamber to the outside via the discharge pipe 38B.

As shown in FIGS. 1 and 6, the first seal member 50 is a resin member having elasticity, and includes polyethylene propylene rubber (EPDM) fluororubber, silicon (Si), natural rubber (NR), or nitrile rubber ( It is made of a material such as NBR. Six insertion parts 51 are formed in the first seal member 50. The first seal member 50 is pressed by the main frame 10 (first frame 10A and second frame 10B) and the rib 43, which will be described in detail later, with the boss 42 of the holding member 40 inserted therein. It is arranged in close contact with the main body 41. The thickness T of the first seal member 50 can be made larger than the difference H between the protrusion amount of the boss 42 and the protrusion amount of the rib 43. As a result, the main body 41 is placed in close contact with the main body 41. As described above, the compression chamber 47 is formed by the space surrounded by the first seal member 50, the partition portion 44, and the main body portion 41. In other words, the first seal member 50 has a function of packing the first openings 31A and 31A of the subframe 30.

The second seal member 60 is sandwiched between the sub-frame 30 and the main frame 10, is larger than the outer shape of the first seal member 50, and is made of a frame-shaped elastic material. The second seal member 60 of the present embodiment is arranged outside the edge portion 50A of the first seal member 50. The second seal member 60 is formed of a material such as polyethylene propylene rubber (EPDM), fluororubber, silicon (Si), natural rubber (NR), or nitrile rubber (NBR).

As shown in FIGS. 1 and 3, the main frame 10 includes a first frame 10A and a second frame 10B that sandwich the sub frame 30. The first frame 10A and the second frame 10B are formed of, for example, a metal material such as aluminum (including die cast), stainless steel, iron, or brass. The first frame 10A and the second frame 10B respectively include the sandwiching portions 11A and 11B, the upper beam portions 12A and 12B, the upper contact portions 13A and 13B, the lower beam portions 16A and 16B, and the lower contact portions 17A and 17B. And have.

The sandwiching portions 11A and 11B are plate-shaped members that are arranged to face each other when the first frame 10A and the second frame 10B are fastened, and are in a direction orthogonal to the main surface (one direction D in the assembled state). ), it is formed in a size larger than the first seal member 50 in a plan view. The upper beam portions 12A, 12B and the lower beam portions 16A, 16B are rod-shaped members extending from the sandwiching portions 11A, 11B along the one direction D, respectively. The upper contact portions 13A, 13B and the lower contact portions 17A, 17B are arranged at one end of the upper beam portions 12A, 12B and the lower beam portions 16A, 16B. The upper contact portion 13A and the upper contact portion 13B are formed with surface contact portions that can come into surface contact with each other. The lower contact portion 17A and the lower contact portion 17B are formed with surface contact portions that can come into surface contact with each other. The holding portion 11A, the upper beam portion 12A, the upper contact portion 13A, the lower beam portion 16A, and the lower contact portion 17A are joined or integrally formed by welding. Similarly, the sandwiching portion 11B, the upper beam portion 12B, the upper contact portion 13B, the lower beam portion 16B, and the lower contact portion 17B are joined to each other by welding or integral molding.

The upper bolts (fastening portions) 14A and 14B and the lower bolts (fastening portions) 18A and 18B fasten the first frame 10A and the second frame 10B. More specifically, the first frame 10A and the second frame 10B are fastened together by the upper bolts 14A and 14B while the upper contact portion 13A and the upper contact portion 13B are in surface contact with each other (metal touch), and the lower contact is made. The parts 17A and the lower contact parts 17B are fastened by the lower bolts 18A and 18B in a state where they are in surface contact with each other (metal touch). In the present embodiment, the bolt has been described as an example of the fastening portion, but the fastening portion is not limited to this. For example, the members may be fastened to each other by a bolt and a nut.

As shown in FIGS. 1 and 4, the pair of the first frame 10A and the second frame 10B fastened by the upper bolts 14A, 14B and the lower bolts 18A, 18B are the first seal member 50, Press 50 in one direction D.

Next, the function and effect of the diaphragm pump 1 of the above embodiment will be described. In the diaphragm pump 1, since the subframe 30 is made of resin, it is possible to reduce corrosion as compared with the subframe 30 made of a metal material. Further, as shown in FIG. 4, the first seal member 50 is attached to the sub-frame 30 by a pair of the first frame 10A and the second frame 10B which are fastened by the upper bolts 14A, 14B and the lower bolts 18A, 18B. By being pressed in the direction D, the first openings 31A, 31A are covered. That is, since the first seal member 50 is fixed to the sub-frame 30 without using a screw, an insert nut, or the like, the fastening force is reduced due to creep due to a phenomenon peculiar to the resin, and the fluid leaks from the sub-frame 30. There is no such thing. As a result, it is possible to reduce the corrosion of the subframe 30 due to the fluid and to maintain the airtightness in the subframe 30.

According to the above-described embodiment, the main frame 10 is in contact with the portions (the upper contact portions 13A, 13B and the lower contact portions 17A, 17B) that are fastened to each other by the upper bolts 14A, 14B and the lower bolts 18A, 18B. Since the contact surfaces of the upper contact portions 13A and 13B and the contact surfaces of the lower contact portions 17A and 17B) are formed of a metal material, loosening of the upper bolts 14A and 14B and the lower bolts 18A and 18B can be reduced. ..

According to the above-described embodiment, since the first seal member 50 has elasticity, the adhesion between the first seal member 50 and the subframe 30 is enhanced, and the airtightness inside the subframe 30 can be further enhanced. it can.

Further, according to the above-described embodiment, the boss 42 of the holding member 40 is in contact with the main frame 10. Therefore, the holding member 40 is pressed inside the sub-frame 30 by the main frame 10 via the boss 42, so that the holding member 40 is firmly fixed. Further, the first seal member 50 is sandwiched between the main frame 10 and the rib 43. Therefore, it is possible to prevent the fluid from leaking from the inside of the sub-frame 30 to the main frame 10 side, and in particular, the effect of suppressing the liquid is high.

According to the above-described embodiment, the holding member 40 includes the second seal member 60 that is sandwiched between the sub-frame 30 and the main frame 10 and that is made of a frame-shaped elastic material that is larger than the outer shape of the first seal member 50. Therefore, it is possible to effectively prevent the fluid from leaking from the inside of the subframe 30 to the outside, and in particular, the effect of suppressing the gas is high.

Although one embodiment has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.

In the above embodiment, as shown in FIG. 3, an example of the configuration of the main frame 10 that holds the first seal member 50 together with the sub-frame 30 and presses the first seal member 50 against the sub-frame 30 in the one direction D. As the upper contact portions 13A and 13B and the lower contact portions 17A and 17B provided at the tips of the upper beam portions 12A and 12B and the lower beam portions 16A and 16B extending from the sandwiching portions 11A and 11B, the upper contact portions are contacted with each other. Although the portions 13A and 13B and the lower contact portions 17A and 17B are fastened by the upper bolts 14A and 14B and the lower bolts 18A and 18B, the description has been given, but the present invention is not limited to this configuration.

For example, as shown in FIG. 7, the main frame (a pair of sandwiching portions) 110 includes a pair of sandwiching portions 111A and 111B. The pair of sandwiching portions 111A and 111B are arranged via a spacer 113 made of a metal material such as aluminum (including die cast), stainless steel, iron, or brass. An insertion hole 115 for inserting the bolt 114 is formed in each of the pair of holding portions 111A and 111B. The spacer 113 is formed with an insertion hole 113A through which the bolt (fastening portion) 114 is inserted. In the pair of holding portions 111A and 111B, the bolt 114 inserted from the outside of one of the pair of holding portions 111A and 111B (the holding portion 111A) is inserted into the insertion hole 113A of the spacer 113, and the pair of holding portions 111A and 111B. It may be configured such that the other side (sandwiching portion 111B) is inserted from the inside and is fastened by the nut 118 on the outside.

Although the spacer 113 has been described by taking the example of being formed in a prismatic shape, it may be formed in a plate shape. Alternatively, a spacer may be used in which the insertion hole 113A is not formed and both ends in the extending direction are tapped. In this case, the holding portions 111A and 111B can be fastened to each other through the spacer by screwing the male screw into the thread groove of the spacer from the pair of holding portions 111A and 111B.

Further, the main frame 110 has a screw hole formed in one of the sandwiching portions 111A and 111B, and the bolt 114 inserted from the outside of the other sandwiching portion 111B and 111A is screwed into the screw hole. Alternatively, the first seal member 50 may be pressed against the subframe 30 in the one direction D. As described above, the main frame 110 may be configured to hold the first seal member 50 together with the sub frame 30 and press the first seal member 50 against the sub frame 30 in the one direction D.

In the above-described embodiment or modification, an example in which the first seal member 50 is formed of a resin member having elasticity has been described, but the first seal member 50 is formed of a resin member having no elasticity. Good. In this case, the first seal member 50 may be formed of a resin material such as PPS (polyphenylene sulfide resin), PBT (polybutylene terephthalate resin), or PP (polypropylene). Even in this case, there is an effect that corrosion due to a fluid such as water or steam can be prevented. Further, an elastic member such as rubber may be arranged between the first seal member 50 and the sandwiching portions 11A and 11B of the main frame 10.

In the above-described embodiment or modification, the main frame 10 is in contact with the portions (upper contact portions 13A, 13B and lower contact portions 17A, 17B) that are fastened together by the upper bolts 14A, 14B and the lower bolts 18A, 18B. Although description has been given by taking an example in which (the contact surfaces of the upper contact portions 13A and 13B and the contact surfaces of the lower contact portions 17A and 17B) are made of a metal material (metal touch), the present invention is limited to this configuration. Not done.

In the above-described embodiment or modification, the sub-frame 30 in which two first openings 31A and 31A into which both ends 4C and 4C of the vibrator 4 can enter during the reciprocating motion are formed is described as an example. The frame 30 may have at least one opening.

In the above-described embodiment or modification, the configuration including the second seal member 60 has been described as an example, but a configuration not including the second seal member 60 may be used. Even in this case, the corrosion of the housing due to the fluid can be reduced and the airtightness inside the housing can be maintained. However, providing the second seal member 60 can more effectively maintain the airtightness inside the housing.

The various embodiments and modifications described above may be variously combined without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1... Electromagnetic vibration type diaphragm pump, 3... Electromagnet, 4... Oscillator, 5... Diaphragm, 10,110... Main frame (holding part), 10A... First frame, 10B... Second frame, 11A, 11B, 111A, 111B... sandwiching part, 12A, 12B... upper beam part, 13A, 13B... upper contact part, 14A, 14B... upper bolt, 16A, 16B... lower beam part, 17A, 17B... lower contact part, 18A, 18B... lower bolt , 30... Subframe (housing), 31... Main body part, 31A, 31A... First opening part (opening part), 35... Positioning part, 40... Holding member, 42... Boss, 43... Rib, 50... First Sealing member, 60... Second sealing member, 111A, 111B... Clamping portion, 114... Bolt (fastening portion), 118... Nut (fastening portion).

Claims (6)

A vibrator to which a magnet is fixed, an electromagnet which is provided so as to face the magnet of the vibrator and reciprocates the vibrator in one direction, and a diaphragm which is provided at least at one end of the vibrator in the one direction. An electromagnetic vibration type diaphragm pump, comprising: the vibrator, the electromagnet, and a housing that houses the diaphragm.
Said transducer, said diaphragm, and accommodates the electromagnet, the reciprocating end of the vibrator during exercise has at least one opening which can be entered, and the housing are formed of a resin,
A lid that covers the opening and is made of resin,
A pair of sandwiching parts for sandwiching the lid together with the housing,
A fastening portion for fastening the holding portions together,
An electromagnetic vibration diaphragm pump in which a pair of sandwiching parts that are fastened by the fastening parts press the lid body against the housing in the one direction. The electromagnetic vibration type diaphragm pump according to claim 1, wherein a portion of the holding portion that is fastened to each other by the fastening portion and a portion that is in contact with each other are made of a metal material. The electromagnetic vibration type diaphragm pump according to claim 1, wherein the lid body has elasticity. Further comprising a holding member for holding the diaphragm,
The housing has a positioning portion that can fit the holding member inside the opening in the one direction,
The electromagnetic vibration type diaphragm pump according to any one of claims 1 to 3, wherein the lid body covers the opening in a state of being in contact with the holding member fitted to the positioning portion. The holding member includes a rib protruding in the one direction and a boss protruding in the one direction from the rib,
The lid has an insertion portion through which the boss can be inserted,
The electromagnetic oscillating diaphragm pump according to claim 4, wherein the boss is in contact with the holding portion while being inserted into the insertion portion, and the rib is held by the lid between the rib and the holding portion. .. The electromagnetic device according to any one of claims 1 to 5, further comprising a seal member that is sandwiched between the housing and the sandwiching portion and that is made of a frame-shaped elastic material that is larger than the outer shape of the lid body. Vibration type diaphragm pump.

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