JP2018053864A - Gas pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology effective for restricting occurrence of noise caused by a solenoid inexpensively at a pump for changing-over a flow passage of compression gas through utilization of the solenoid.SOLUTION: An electromagnetic pump 1 comprises a pump main body part 10 for compressing air and discharging it; and a flow passage changeover part 30 for changing over a flow passage of compression air compressed by the pump main body part 10. The flow passage changeover part 30 comprises a tank 31, a change-over valve 44 for performing a flow passage changing-over operation for compression air to cause an inflow chamber 32 in the tank 31 to be communicated with any one of the two flow passages P1, P2, and a solenoid 50 for generating a flow passage change-over operation of a change-over valve 44 by electromagnetic force and at the same time fixed to the tank 31 under a state in which it is pushed through insulation members 55, 57 having vibration insulation characteristics.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas pump that compresses and discharges gas.

Conventionally, an electromagnetic diaphragm pump (hereinafter simply referred to as “pump”), which is an example of this type of gas pump, is disclosed in Patent Document 1 below. This pump includes a pump main body for compressing and discharging gas, and a switching mechanism for alternately closing two discharge ports provided in the tank by a switching valve plate. In the switching mechanism, the switching valve plate is configured to be driven by electromagnetic force of a solenoid.
According to this configuration, one of the two discharge ports is closed when the switching valve plate is driven, and the compressed gas discharged from the pump main body is discharged from the discharge port that is not blocked by the switching valve plate. It flows out of the tank.

JP 2003-35266 A

  The solenoid as described above is configured to operate when a magnetic field is generated in the central portion of the coil by the power supply from the power source, and the magnetized fixed iron core attracts the movable iron core. In this configuration, if the smoothness of the attracted surface of the fixed iron core is low, or if foreign matter adheres between the attracted surface of the fixed iron core and the movable iron core, the movable iron core becomes the attracted surface of the fixed iron core. It is known that noise is generated when it is vibrated while adsorbed on the surface. In particular, in the case of an AC solenoid, the current of the AC power source changes periodically, and the attractive force of the movable iron core with respect to the fixed iron core also periodically increases and decreases accordingly, so that the movable iron core is more likely to vibrate. The problem of noise is remarkable. This noise is a sound generated in resonance with the frequency of the alternating current, and is referred to as a “beat sound”.

  Therefore, in order to suppress the generation of noise when using a solenoid, measures are taken to increase the smoothness of the attracted surface of the fixed iron core and increase the adhesion between the attracted surface of the fixed iron core and the movable iron core to reduce vibration. Conceivable. However, in the case of this countermeasure, it is necessary to increase the processing accuracy of the fixed iron core, which may cause a problem that the product cost of the pump increases.

  The present invention has been made in view of such problems, and it is an object of the present invention to provide a technique effective in suppressing the generation of noise by a solenoid at a low cost in a pump that switches the flow path of a compressed gas using a solenoid. .

One embodiment of the present invention provides:
A gas pump comprising: a pump main body that compresses and discharges gas; and a flow path switching unit that switches a flow path of the compressed gas compressed by the pump main body,
The flow path switching unit is
An inflow chamber into which the compressed gas flows from the pump main body, a plurality of outflow ports, and a plurality of flow paths for flowing the compressed gas from the inflow chamber to the plurality of outflow ports, respectively. A tank,
A switching valve that performs a flow path switching operation for the compressed gas so that the inflow chamber of the tank communicates with any one of the plurality of flow paths;
A solenoid that causes a flow path switching operation of the switching valve by electromagnetic force, and is fixed to the tank in a state of being pressed through an insulating member having vibration insulation,
A gas pump comprising:

In the gas pump, the compressed gas flows into the tank of the flow path switching unit from the pump body. The compressed gas flowing into the inflow chamber of the tank flows into any one of the plurality of flow paths by the flow path switching operation of the switching valve. The solenoid operates when power is supplied from the power source and causes the switching valve to switch the flow path by electromagnetic force. The solenoid is configured to be fixed to the tank while being pressed through an insulating member having vibration insulation.
According to this configuration, the vibration generated when the solenoid is operated is absorbed by the insulating member having vibration insulation. Thereby, generation | occurrence | production of the noise by a solenoid is suppressed. Further, by using the insulating member, the cost required for the structure for suppressing the generation of noise can be kept low.

  As described above, according to the above aspect, it is possible to provide a gas pump that can suppress the generation of noise by the solenoid at low cost.

The disassembled perspective view of the electromagnetic pump of this embodiment. The top view of the flow-path switching part in FIG. The perspective view of the solenoid periphery among the flow-path switching parts in FIG. Sectional drawing of a solenoid periphery among the flow-path switching parts in FIG. The top view which shows the state of the switching valve at the time of the action | operation of a solenoid in a flow-path switching part. The top view which shows the state of the switching valve at the time of the non-operation of a solenoid in a flow-path switching part. The figure which shows the pump main-body part in FIG. 1 typically. The figure which shows a state when a vibrator | oscillator strokes in one direction in FIG. The figure which shows a state when a vibrator | oscillator strokes in the other direction in FIG.

  The “gas” used in the gas pump includes various gases such as a non-combustible gas, a combustible gas, a combustion-supporting gas, and a mixed gas in which a plurality of gases belonging to these gases are mixed. For example, air used in an air pump that is one of gas pumps also corresponds to “gas” here.

In the gas pump, the flow path switching unit includes a first wall portion and a second wall portion arranged on both sides of the solenoid in a crossing direction intersecting a linear motion direction of the switching valve, and the solenoid includes the The insulating member is interposed between each of the first wall portion and the second wall portion, and is fixed to the tank while being sandwiched between the first wall portion and the second wall portion in the intersecting direction. Preferably it is done.
In this case, the solenoid can be easily fixed to the tank by using a force for sandwiching the solenoid between the first wall portion and the second wall portion. Further, since the direction in which the first wall portion and the second wall portion sandwich the solenoid intersects the linear movement direction of the switching valve, the force for sandwiching the solenoid can be low.

In the gas pump, the flow path switching unit is configured such that the first wall portion is configured as a bottom wall portion of the tank, and the second wall portion is configured as a partition member that partitions the pump main body portion and the tank. The solenoid is preferably fixed to the tank by using a fastening force for fastening the partition member to the tank with a screw member.
In this case, the operation of fastening the partition member to the tank also serves as the operation of fixing the solenoid to the tank. Thereby, the structure which fixes solenoid itself to a tank directly with a screw member etc. can be omitted. Further, when the solenoid is broken or inspected, the solenoid can be easily removed from the tank by releasing the pinching of the solenoid.

In the gas pump, one of the first wall portion and the second wall portion is configured as a metal wall portion made of a metal material, and the gas pump is interposed between the metal wall portion and the solenoid. The insulating member preferably has both vibration insulation and electrical insulation.
In this case, the electrical insulation of the solenoid can be enhanced by using an insulating member. That is, the solenoid has a double insulation structure in which an additional electric insulation structure is added to the original basic electric insulation structure. This makes it possible to eliminate the earth generally attached to the tank when the tank is made of metal.

In the gas pump, the insulating member preferably includes a locking portion that locks the solenoid.
In this case, when the solenoid is fixed to the tank, the solenoid can be integrated with the insulating member in advance by the engaging portion of the insulating member. Thereby, it is not necessary to assemble the solenoid and the insulating member separately, and the assembly work of the solenoid and the insulating member is facilitated.

In the gas pump, the insulating member is preferably made of a resin material or a rubber material.
In this case, the product cost of the pump can be kept low by using a general-purpose resin material or rubber material for the insulating member.

In the gas pump, the pump main body includes a diaphragm that can be elastically deformed to perform the gas suction operation and the gas discharge operation, a vibrator that includes a permanent magnet and is connected to the diaphragm, and the vibrator includes the vibrator. It is preferable to include a drive unit that applies an electromagnetic force to the vibrator so as to reciprocally vibrate while elastically deforming the diaphragm.
Thereby, in the electromagnetic pump using a diaphragm, generation | occurrence | production of the noise by the solenoid of a flow-path switching part can be suppressed at low cost.

(Embodiment)
Hereinafter, an embodiment of an electromagnetic pump according to the present invention will be described with reference to the drawings. This electromagnetic pump is typically used for supplying air to the water to be treated in the septic tank and supplying driving air to an air lift pump for transferring the water to be treated in the septic tank. .

  In the drawings for explaining the electromagnetic pump, a first direction which is an operation direction of the switching valve of the flow path switching unit is indicated by an arrow X, and a second direction orthogonal to the first direction X is indicated by an arrow Y. A third direction which is the height direction of the pump and is orthogonal to both the first direction and the second direction is indicated by an arrow Z.

  As shown in FIG. 1, the electromagnetic pump 1 is one of gas pumps, and is configured as an air pump that compresses and discharges air as gas (hereinafter also simply referred to as “pump”).

  The pump 1 includes a pump main body 10 that compresses and discharges air, and a flow path switching unit 30 that switches a flow path of the compressed air compressed by the pump main body 10.

  The pump main body 10 is arranged above the flow path switching unit 30 in the third direction Z. The flow path switching unit 30 includes a partition member 30 a interposed between the pump main body 10 and the pump main body 10 in order to partition the pump main body 10 and the tank 31. The partition member 30a is made of a flat metal material. The partition member 30a is provided with a pair of through holes 30b and 30b that are formed to penetrate in the plate thickness direction.

  The component 10 a of the pump body 10 is accommodated in the casing 11 and attached on the base plate 3. The base plate 3 is fastened and fixed to the tank 31 of the flow path switching unit 30 together with the partition member 30 a by the screw member 5. The pump body 10 is covered from above by the cover 2. The cover 2 is fixed to the tank 31 by a screw member 6. The tank 31 is a metal housing made of a metal material such as aluminum.

  The pump body 10 includes a pair of discharge chambers 18 and 18 and is configured such that compressed air discharged from each discharge chamber 18 flows into the tank 31 through the through hole 30b of the partition member 30a. As a result, the compressed air flows from the pump body 10 into the tank 31 of the flow path switching unit 30. The tank 31 fulfills the function of temporarily retaining this compressed air.

  As shown in FIGS. 1 and 2, the flow path switching unit 30 includes a tank 31 and a switching valve 44.

  The tank 31 includes an inflow chamber 32 into which compressed air flows from the discharge chamber 18 of the pump main body 10, and two outflow ports 35, 38. There are two flow paths P1, P2 for flowing through. According to the first flow path P <b> 1, the compressed air that has flowed into the inflow chamber 32 flows out from the outlet 35 through the first chamber 33 and the second chamber 34 in order. On the other hand, according to the second flow path P <b> 2, the compressed air that has flowed into the inflow chamber 32 flows out from the outflow port 38 via the third chamber 36 and the fourth chamber 37 in order.

  The tank 31 includes a communication opening 33 b in the third wall 33 a that partitions the first chamber 33 and the second chamber 34. For this reason, the compressed air that has flowed into the first chamber 33 is configured to flow into the second chamber 34 through the communication opening 33b of the third wall portion 33a. Further, the tank 31 includes a communication opening 36 b in a fourth wall portion 36 a that partitions the third chamber 36 and the fourth chamber 37. For this reason, the compressed air flowing into the third chamber 36 is configured to flow into the fourth chamber 37 through the communication opening 36b of the fourth wall portion 36a.

  The tank 31 includes a first valve seat 41 on a first partition wall 32 a that partitions the inflow chamber 32 and the first chamber 33. Further, the tank 31 includes a second valve seat 42 on the second partition wall 32 b that partitions the inflow chamber 32 and the third chamber 36. The first valve seat 41 includes a communication hole 41 a that allows the inflow chamber 32 and the first chamber 33 to communicate with each other. The second valve seat 42 includes a communication hole 42 a that allows the inflow chamber 32 and the third chamber 36 to communicate with each other.

  Between the 1st valve seat 41 and the 2nd valve seat 42, the switching valve (valve body) 44 fixed to the long-axis-shaped rod 43 is arrange | positioned. The switching valve 44 performs a function of performing a flow path switching operation for compressed air by linear motion so that the inflow chamber 32 of the tank 31 communicates with one of the two flow paths P1 and P2.

  In order to achieve this function, when the rod 43 reciprocates in the first direction X, the switching valve 44 is either one of the communication hole 41a of the first valve seat 41 and the communication hole 42a of the second valve seat 42. It is comprised so that it may block and seal. Therefore, the compressed air that has flowed into the inflow chamber 32 of the tank 31 flows into one of the two flow paths P1 and P2 by the flow path switching operation of the switching valve 44.

  The flow path switching unit 30 includes a solenoid 50 and a spring member 60 as elements for reciprocating the rod 43 to which the switching valve 44 is fixed in the first direction X.

  As shown in FIG. 2, the spring member 60 is a so-called “tensile coil spring”, one end of which is connected to one end 43 a of the rod 43 and the other end is fixed to the fixing pin 33 c on the tank 31 side. Has been. For this reason, the rod 43 is always elastically biased by the spring member 60 in a direction approaching the fixing pin 33c.

  The solenoid 50 is disposed in the solenoid chamber 39 of the tank 31. The solenoid 50 is a solenoid actuator that operates when electric power is supplied from an AC power supply (not shown) and causes a reciprocating operation of the switching valve 44 in the first direction X, that is, a flow path switching operation by electromagnetic force. The solenoid 50 is configured as a direct acting solenoid (electromagnet) that converts electric energy into linear mechanical motion.

  As shown in FIG. 3, the solenoid 50 includes a coil (not shown) wound with a copper wire, a fixed iron core 51 fixed to the tank 31, and a straight line in the first direction X with respect to the fixed iron core 51. A movable iron core 52 that can be operated automatically.

  The fixed iron core 51 has a resin mold structure in which a laminate of a plurality of metal plates made of a magnetic material such as iron is molded with a resin. The fixed iron core 51 includes a space 51a extending in the first direction X inside.

  The movable iron core 52 is made of a magnetic material such as iron, like the fixed iron core 51. The movable iron core 52 includes an insertion portion 53 that is inserted into the space 51 a of the fixed iron core 51, and a contact portion 54 that is provided at one end of the insertion portion 53. It is connected to the other end 43b.

  As shown in FIGS. 3 and 4, a first insulating member 55 is provided between the fixed iron core 51 and the tank 31. The first insulating member 55 is made of a resin material and has vibration insulation and electrical insulation. The first insulating member 55 includes a first flat plate portion 55a and a second flat plate portion 55c that extend in directions orthogonal to each other.

  Here, “having vibration insulation” means that the function of preventing propagation of vibration is excellent (vibration is difficult to be transmitted). Further, “having electrical insulation” as used herein means that the function of preventing energization is excellent (it is difficult to pass current).

  The first flat plate portion 55 a of the first insulating member 55 has a flat plate shape that extends on a plane defined by both the first direction X and the second direction Y. The second flat plate portion 55c has a flat plate shape that extends on a plane defined by both the second direction Y and the third direction Z.

  The first flat plate portion 55 a includes locking portions 55 b on both sides in the second direction Y in order to lock the fixed iron core 51 of the solenoid 50. Each of the pair of locking portions 55b and 55b has a claw shape that can be bent and deformed so as to be separated from each other in the second direction Y. For this reason, when the fixed iron core 51 is pressed against the first flat plate portion 55a so as to bend and deform the locking portions 55b outward, the fixed iron core 51 is deformed toward the original position after being deformed. The first insulating member 55 is integrated by being locked by the locking portions 55b and 55b. In this case, it can also be said that “the first insulating member 55 is locked to the fixed iron core 51 via the pair of locking portions 55b and 55b”.

  The first insulating member 55 is configured to be fixed to the tank 31 by a screw member 56 in the first flat plate portion 55a. At this time, the fixed iron core 51 is temporarily fixed to the tank 31. In a state where the first insulating member 55 is fixed to the tank 31 together with the fixed iron core 51, the first insulating member 55 is disposed between the lower surface 51 b of the fixed iron core 51 and the bottom wall portion 39 a forming the bottom surface of the solenoid chamber 39. On the other hand, the second flat plate portion 55 c is disposed between the side surface 51 c of the fixed iron core 51 and the side wall portion 39 b that forms the side surface of the solenoid chamber 39.

  A second insulating member 57 is bonded to the upper surface 51 d of the fixed iron core 51. Thus, in a state where the partition member 30a is attached to the tank 31, the second insulating member 57 is interposed between the upper surface 51d of the fixed iron core 51 and the lower surface 30c of the partition member 30a. The second insulating member 57 is made of a rubber material, and has a vibration insulating property and an electrical insulating property like the first insulating member 55. The second insulating member 57 has a flat plate shape extending on a plane defined by both the first direction X and the second direction Y, and includes a lower surface 51b of the fixed iron core 51 and a bottom wall portion 39a of the tank 31. It is arranged between.

  In addition, although not particularly illustrated, a seal packing is provided in a region between the second insulating member 57 and the partition member 30a, that is, the upper surface of the tank 31, and air leakage to the outside of the tank 31 or the tank 31 is provided. Air leakage between the inner chambers is prevented.

  In a state where the base plate 3 is fixed to the tank 31 together with the partition member 30 a by the screw member 5, the fastening axial force by the screw member 5 acts in the third direction Z. Thereby, the partition member 30 a is pressed against the fixed iron core 51 through the second insulating member 57. Further, the fixed iron core 51 is pressed against the bottom wall portion 39 a of the tank 31 through the first flat plate portion 55 a of the first insulating member 55. At this time, the fixed iron core 51 is sandwiched between the tank 31 and the partition member 30a with the insulating members 55 and 57 interposed between the upper and lower sides in the third direction Z. The fixed iron core 51 is fixed to the tank 31 by this clamping force.

  In this case, wall portions (first walls) arranged on both sides of the solenoid 50 in the crossing direction (third direction Z) intersecting the linear movement direction of the switching valve 44 by the bottom wall portion 39a of the tank 31 and the partition member 30a. Part and the second wall part). And between the solenoid 50 and the bottom wall part 39a as a 1st wall part, the 1st flat plate part 55a of the 1st insulating member 55 is interposed, and between the partition members 30a as a 2nd wall part. A second insulating member 57 is interposed, and is fixed to the tank 31 in a state of being sandwiched between the first wall portion and the second wall portion in the intersecting direction. That is, the solenoid 50 is fixed to the tank 31 while being pressed through the two insulating members 55 and 57. In this case, both the first wall portion and the second wall portion are configured as metal wall portions made of a metal material.

  Further, in a state where the solenoid 50 is fixed to the tank 31, the fixed iron core 51 is brought into contact with the side wall portion 39b of the tank 31 through the second flat plate portion 55c of the first insulating member 55 in the first direction X. It is configured.

  In the solenoid 50 configured as described above, a magnetic field is generated at the center of the coil by the supply of power from the AC power source. At this time, the magnetized fixed iron core 51 attracts the movable iron core 52, whereby the solenoid 50 operates. The movable iron core 52 is configured to be sucked in the direction in which the insertion portion 53 is inserted into the space 51a when the solenoid 50 is operated.

  Therefore, when the solenoid 50 is operated, the movable iron core 52 is attracted to the fixed iron core 51 by overcoming the elastic biasing force of the spring member 60, and is attracted to the attracted surface 51 e of the fixed iron core 51 at the contact portion 54. Thereby, the rod 43 moves in the direction approaching the solenoid 50 in the first direction X, and the communication hole 42a of the second valve seat 42 is sealed by the switching valve 44 (see FIG. 5). As a result, the compressed air that has flowed into the inflow chamber 32 is blocked from flowing into the third chamber 36 and flows out from the outlet 35 through only the first flow path P1.

  On the other hand, the solenoid 50 is deactivated when the power supply from the AC power supply is temporarily stopped. At this time, the movable iron core 52 is configured such that the insertion portion 53 is inserted from the space 51 a in accordance with the elastic biasing force of the spring member 60. Therefore, the movable iron core 52 is pulled only according to the elastic biasing force of the spring member 60 when the solenoid 50 is not operated. Thereby, the rod 43 moves in the direction away from the solenoid 50 in the first direction X, and the communication hole 41a of the first valve seat 41 is sealed by the switching valve 44 (see FIG. 6). As a result, the compressed air that has flowed into the inflow chamber 32 is prevented from flowing into the first chamber 33, and flows out from the outflow port 38 only through the second flow path P2.

  Incidentally, it is known that the AC power supply for the solenoid 50 periodically increases and decreases in accordance with the suction force of the movable core 52 with respect to the fixed core 51 because the current periodically changes. This increase / decrease in attractive force can be a cause of noise unique to AC solenoids. This noise is a sound generated in resonance with the frequency of the alternating current, and is referred to as a “beat sound”.

  Therefore, in order to suppress the occurrence of the roaring sound, a shading coil (kumari coil) 58 is incorporated in the fixed iron core 51 for preventing increase and decrease of the attractive force. The shading coil 58 has a known structure and will not be described in detail. However, by combining a suction force whose phase is shifted by 90 degrees with respect to the suction force of the fixed iron core 51, the suction force is zero. It fulfills the function of eliminating the moment.

  However, when the smoothness of the attracted surface 51e of the fixed iron core 51 and the exposed surface 58a of the shading coil 58 is low, it is difficult to suppress the generation of a noise (noise). However, if the processing accuracy of the attracted surface 51e of the fixed core 51 and the exposed surface 58a of the shading coil 58 is increased, the product cost of the pump 1 itself increases.

Therefore, in the flow path switching unit 30 of the present embodiment, the solenoid 50 is configured to be fixed to the tank 31 while being pressed through the two insulating members 55 and 57 having vibration insulation properties. Yes. According to this configuration, the vibration generated when the solenoid 50 is operated is absorbed by the insulating members 55 and 57 having vibration insulation. Thereby, generation | occurrence | production of the beep sound by the solenoid 50 is suppressed.
In addition, by using the insulating members 55 and 57, for example, compared to the case where the attracted surface 51e of the fixed iron core 51 and the exposed surface 58a of the shading coil 58 are processed with high accuracy, the generation of beat noise is suppressed. The cost required for the structure can be kept low.

  Further, according to the flow path switching unit 30 of the present embodiment, the solenoid 50 can be easily fixed to the tank 31 by using a force for sandwiching the solenoid 50 between the bottom wall portion 39a of the tank 31 and the partition member 30a. At this time, the direction in which the bottom wall portion 39a of the tank 31 and the partition member 30a sandwich the solenoid 50 (third direction Z) intersects the linear movement direction (first direction X) of the switching valve 44. The clamping force is low.

Further, according to the flow path switching unit 30 of the present embodiment, the solenoid 50 is fixed to the tank 31 by using a fastening force for fastening the partition member 30 a to the tank 31 by the screw member 5. That is, the solenoid 50 is not fixed to the tank 31 by a screw member or the like. In this case, the work of fastening the partition member 30 a to the tank 31 also serves as the work of fixing the solenoid 50 to the tank 31. Thereby, the structure which fixes solenoid 50 itself to the tank 31 directly with a screw member etc. is omissible.
Further, when the solenoid 50 is broken or inspected, the solenoid 50 can be easily removed from the tank 31 by releasing the sandwiching of the solenoid 50.

  Moreover, according to the flow path switching unit 30 of the present embodiment, the electrical insulation of the solenoid 50 can be enhanced by using the insulating members 55 and 57. That is, the solenoid 50 has a double insulation structure in which an additional electrical insulation structure is added to the original basic electrical insulation structure. Specifically, the first insulating member 55 is interposed between the fixed iron core 51 of the solenoid 50 and the metal tank 31, and the second insulating member 55a is interposed between the fixed iron core 51 of the solenoid 50 and the metal partition member 30a. An insulating member 57 is interposed.

  Here, the “basic electrical insulation structure” refers to an insulation structure for performing basic protection against electric shock. On the other hand, the “additional electrical insulation structure” here refers to an insulation structure for protecting against electric shock when the basic electrical insulation structure is broken.

  Thus, since the solenoid 50 has a double insulation structure, it becomes possible to abolish the earth generally attached to the metal tank 31.

  Further, according to the flow path switching unit 30 of the present embodiment, when the solenoid 50 is fixed to the tank 31, the solenoid 50 is integrated with the first insulating member 55 in advance by the locking portion 55 b of the first insulating member 55. It can be made. Thereby, it is not necessary to assemble the solenoid 50 and the first insulating member 55 separately, and the assembling work of the solenoid 50 and the first insulating member 55 is facilitated.

  Further, according to the flow path switching unit 30 of the present embodiment, the product cost of the pump 1 can be kept low by using a general-purpose resin material or rubber material for the insulating members 55 and 57.

  Next, the details of the pump body 10 of the pump 1 will be described with reference to FIGS.

  As shown in FIG. 7, a pair of solenoids 12, 12 as a drive unit are accommodated in the casing 11 of the pump body 10. In the gap 12 a between the pair of solenoids 12, 12, the vibrator 13 is disposed so as not to contact the pair of solenoids 12, 12. The vibrator 13 includes permanent magnets (N pole and S pole) 13a and 13b having different polarities.

  Disc-shaped plate members 14 are attached to both ends of the vibrator 13. The plate member 14 is fixed to the casing 11 via a disk-shaped diaphragm 14a. Therefore, the vibrator 13 is indirectly connected to the diaphragm 14 a via the plate member 14. The diaphragm 14a is formed of a rubber material that can be elastically deformed in order to perform an air suction operation and a discharge operation, and is configured to elastically deform following the reciprocating vibration of the plate member 14.

  The pair of solenoids 12 and 12 are connected to the vibrator 13 so that the vibrator 13 reciprocally vibrates in the first direction X while elastically deforming the diaphragm 14a by electromagnetic force generated when power is supplied from an AC power supply (not shown). It fulfills the function of applying electromagnetic force.

  A valve case body 11 a is provided outside the plate member 14 in the casing 11. The valve case body 11 a includes a compression chamber 15, a suction chamber 16, and a discharge chamber 18. The suction chamber 16 is a space for sucking air outside the pump as suction air from a suction port (not shown). The compression chamber 15 is a space for compressing the intake air sucked from the suction chamber 16 through the suction valve 17. The discharge chamber 18 is a space for discharging the compressed air compressed in the compression chamber 15 through the discharge valve 19.

  In the pump main body 10 having the above-described configuration, when the vibrator 13 reciprocates in the first direction X in accordance with the polarity change when the pair of solenoids 12 and 12 are energized, each diaphragm 14a is displaced by the same displacement as the stroke of the vibrator 13. It is elastically deformed in the first direction X by the amount.

  As shown in FIG. 8, when the right diaphragm 14a is elastically deformed in the left direction during the stroke of the vibrator 13 in one direction (arrow X1), the right compression chamber 15 becomes negative pressure. The negative pressure causes the right discharge valve 19 to be closed and the right suction valve 17 to be opened, so that air is sucked from the right suction chamber 16 into the right compression chamber 15 (suction operation).

  Further, when the left diaphragm 14a is elastically deformed leftward during the stroke of the vibrator 13 in one direction (arrow X1), air is pressurized in the left compression chamber 15. Since the left suction valve 17 is closed and the left discharge valve 19 is opened by this pressurization, compressed air is discharged from the left compression chamber 15 to the left discharge chamber 18 (discharge operation). .

  On the other hand, as shown in FIG. 9, when the left diaphragm 14a is elastically deformed in the right direction during the stroke of the vibrator 13 in the other direction (arrow X2), the left compression chamber 15 becomes negative pressure. Become. This negative pressure closes the left discharge valve 19 and opens the left suction valve 17, so that air is sucked from the left suction chamber 16 into the left compression chamber 15 (suction operation).

  Further, when the right diaphragm 14a is elastically deformed rightward during the stroke of the vibrator 13 in the other direction (arrow X2), air is pressurized in the right compression chamber 15. This pressurization closes the right suction valve 17 and opens the right discharge valve 19, so that compressed air is discharged from the right compression chamber 15 to the right discharge chamber 18 (discharge operation). .

  By alternately repeating the suction operation and the discharge operation as described above, the compressed air having a predetermined pressure and flow rate is continuously discharged from the pump body 10 toward the tank 31 of the flow path switching unit 30.

  For further details of the structure of the pump body 10, refer to the air supply device disclosed in Japanese Patent No. 4405171, the electromagnetic pump disclosed in Japanese Patent No. 4556417, and the electromagnetic pump disclosed in Japanese Patent No. 4606189. Is done.

  As shown in the above embodiment, in the electromagnetic pump 1 using the diaphragm 14a, the generation of noise by the solenoid 50 of the flow path switching unit 30 can be suppressed at a low cost.

  The present invention is not limited to the above-described exemplary embodiments, and various applications and modifications can be considered without departing from the object of the present invention. For example, the following embodiments applying the above-described embodiment can be implemented.

  In the above embodiment, the AC solenoid is used as the solenoid 50 for driving the switching valve 44. However, a DC solenoid may be used instead of the AC solenoid. In the case of the DC solenoid, similarly to the case of the AC solenoid, it is possible to suppress the generation of noise when the movable iron core 52 vibrates while being attracted to the attracted surface 51e of the fixed iron core 51.

  In the above-described embodiment, the case where the switching valve 44 is driven by combining the solenoid 50 and the spring member 60 which is a tension coil spring is exemplified, but instead, by combining the solenoid 50 and the compression coil spring, Alternatively, a structure in which the switching valve 44 is driven by combining a plurality of solenoids may be employed.

In the above embodiment, the case where the two wall portions sandwiching the solenoid 50 in the intersecting direction intersecting the linear motion direction of the switching valve 44 is configured by the partition member 30a and the bottom wall portion 39a of the tank 31, These two wall parts can also be comprised by the site | part different from the partition member 30a and the bottom wall part 39a.
In addition, a configuration in which the two walls sandwich the solenoid 50 in a direction different from the intersecting direction (for example, a direction along the linear motion direction of the switching valve 44) may be employed.

  In the above embodiment, the case where the solenoid 50 is not fixed to the tank 31 by a screw member or the like is illustrated, but instead, the solenoid 50 is pressed against the tank 31 via an insulating member having vibration insulation. In this state, a structure in which the solenoid 50 is fastened and fixed to the tank 31 by a screw member may be employed. In this case, a non-conductive screw member is preferably used to provide additional electrical insulation of the solenoid 50.

  In the above embodiment, the case where both the partition member 30a and the tank 31 are made of a metal material has been illustrated, but instead, at least one of the partition member 30a and the tank 31 can be made of a resin material. . In this case, an insulating member (additional electrical insulating structure) provided for an element made of a resin material can be omitted. For example, when the partition member 30a is made of a resin material, the second insulating member 57 of the two insulating members 55 and 57 can be omitted and only the first insulating member 55 can be used. Further, when the tank 31 is made of a resin material, the first insulating member 55 of the two insulating members 55 and 57 can be omitted and only the second insulating member 57 can be used.

  In the above embodiment, the first insulating member 55 is made of a resin material and the second insulating member 57 is made of a rubber material. However, the first insulating member 55 is made of a resin material or a rubber material, and A structure in which the second insulating member 57 is made of a resin material or a rubber material can be employed.

  In the above embodiment, the case where the insulating members 55 and 57 having both vibration insulation and electrical insulation are used has been illustrated. However, the tank 31 and the partition member 30a that may be electrically connected to the solenoid 50 are exemplified. In the case where is made of a non-conductive material, instead of the insulating members 55 and 57, an insulating member having vibration insulating properties but not electrically insulating properties may be employed.

  Further, instead of the insulating members 55 and 57 made of a resin material or a rubber material, a vibration insulating material such as felt, a vibration absorbing material such as a damping steel plate or an asphalt sheet may be employed. Further, instead of or in addition to the insulating members 55 and 57, vibration of the solenoid 50 may be suppressed by using a member that can be elastically deformed such as a spring member or a damper member.

  In the above embodiment, the first insulating member 55 provided with the locking portion 55b for locking the solenoid 50 is illustrated, but the locking portion 55b of the first insulating member 55 is omitted as necessary. You can also. In this case, the first insulating member 55 may be configured to be fixed to the solenoid 50 in advance by bonding and assembled to the tank 31 together with the solenoid 50, or may be separated from the solenoid 50 before the solenoid 50. It may be configured to be assembled to the tank 31.

  In the above embodiment, the structure in which the second insulating member 57 is bonded to the solenoid 50 is illustrated, but instead of this structure, the partition member 30a and the tank 31 are not bonded to the solenoid 50. It is also possible to adopt a structure sandwiched between the two. Alternatively, the second insulating member 57 may be provided with a locking portion similar to the locking portion 55b of the solenoid 50, and the second insulating member 57 and the solenoid 50 may be integrated via the locking portion.

  In the above embodiment, the pump main body 10 that compresses air using the electromagnetic force of the solenoid 12 has been illustrated. However, instead of the pump main body 10, air is used using an actuator such as a motor or a power cylinder. It is also possible to employ a pump main body to be compressed.

  In the above embodiment, the pump 1 in which the plate member 14 and the diaphragm 14a are attached to both ends of the vibrator 13 is illustrated, but the plate member 14 and the diaphragm 14a are attached to only one end of the vibrator 13. Also good.

  In the above embodiment, the case where the inflow chamber 32 of the tank 31 communicates with any one of the two flow paths P1, P2 by the flow path switching operation of the switching valve 44 is illustrated, but the number of flow paths is as follows. The number of paths is not limited to two, and three or more paths may be employed.

  In the above-described embodiment, the pump 1 that compresses and discharges air, which is one of the gases, has been illustrated. However, the structure of the pump 1 may be a gas other than air, such as combustion gas (propane, hydrogen gas, etc.) The present invention can also be applied to the structure of a gas pump that compresses and discharges gas such as gas (nitrogen gas, helium gas, etc.).

1 Electromagnetic pump (gas pump)
5 Screw member 10 Pump body 12 Solenoid (drive unit)
13 Vibrator 13a, 13b Permanent magnet 14a Diaphragm 30 Flow path switching unit 30a Partition member (second wall)
31 Tank 32 Inflow chamber 35, 38 Outflow port 39a Bottom wall (first wall)
44 switching valve 50 solenoid 55 first insulating member (insulating member)
55b Locking portion 57 Second insulating member (insulating member)
P1 First channel (channel)
P2 Second channel (channel)

Claims (7)

A gas pump comprising: a pump main body that compresses and discharges gas; and a flow path switching unit that switches a flow path of the compressed gas compressed by the pump main body,
The flow path switching unit is
An inflow chamber into which the compressed gas flows from the pump main body, a plurality of outflow ports, and a plurality of flow paths for flowing the compressed gas from the inflow chamber to the plurality of outflow ports, respectively. A tank,
A switching valve that performs a flow path switching operation for the compressed gas so that the inflow chamber of the tank communicates with any one of the plurality of flow paths;
A solenoid that causes a flow path switching operation of the switching valve by electromagnetic force, and is fixed to the tank in a state of being pressed through an insulating member having vibration insulation,
Comprising a gas pump. The flow path switching unit includes a first wall portion and a second wall portion that are disposed on both sides of the solenoid in a crossing direction that intersects a linear motion direction of the switching valve,
The solenoid has the insulating member interposed between the first wall portion and the second wall portion, and is sandwiched between the first wall portion and the second wall portion in the intersecting direction. The gas pump according to claim 1, wherein the gas pump is fixed to the tank. The flow path switching portion is configured such that the first wall portion is configured as a bottom wall portion of the tank, and the second wall portion is configured as a partition member that partitions the pump main body portion and the tank,
The gas pump according to claim 2, wherein the solenoid is fixed to the tank by using a fastening force for fastening the partition member to the tank with a screw member.   At least one of the first wall portion and the second wall portion is configured as a metal wall portion made of a metal material, and the insulating member interposed between the metal wall portion and the solenoid is vibration insulating. The gas pump according to claim 2 or 3, which has both electrical insulation properties.   The gas pump according to any one of claims 1 to 4, wherein the insulating member includes a locking portion that locks the solenoid.   The gas pump according to claim 1, wherein the insulating member is made of a resin material or a rubber material.   The pump body includes a diaphragm that can be elastically deformed to perform the gas suction operation and gas discharge operation, a vibrator that has a permanent magnet and is connected to the diaphragm, and the vibrator elastically deforms the diaphragm. A gas pump according to any one of claims 1 to 6, further comprising: a drive unit that applies electromagnetic force to the vibrator so as to reciprocate.

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