JP3854373B2 - Air pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is an air pump mainly used for supplying fresh air to the interior of an aquarium for aquaculture and aquatic plants, without causing an increase in the size of the air pump. The pump noise can be reduced.
[0002]
[Prior art]
In recent years, appreciation fish etc. have been widely bred in general households, offices, hotels, etc., and all of them have been appreciating fish by supplying fresh air into the aquarium using an air pump. Yes.
[0003]
15 and 16 show an example of a conventional air pump P used for breeding the above-mentioned appreciation fish, etc., and the air pump P is inside the plastic case main body 20 whose back side is open. In the space, an electromagnet 21, a vibrating piece 23 having a permanent magnet 22 fixed at the tip thereof, a diaphragm pump 24 driven by the vibrating piece 23, and the like are disposed, and a back-side opening of the case body 20 is a lid. 25 is hermetically sealed.
In FIGS. 15 and 16, 24a is a pump case of the diaphragm pump 24, 24b is an elastic rubber diaphragm, 24c is a diaphragm chamber, 24d is a suction valve, 24e is a discharge valve, and 24f is an air suction port. , 24g is an air discharge port, 26 is an air introduction port, 27 is a fulcrum of the vibrating piece 23, 28 is a power cord, and 29 is an air supply pipe.
[0004]
Thus, in the air pump P, when an AC voltage is applied via the power cord 28, the electromagnet 21 is activated, and the vibrating piece 23 is moved as shown in FIG. 15 by the electromagnetic force acting between the electromagnet 21 and the permanent magnet 22. Vibrates in the direction of the arrow. As a result, the bag-like rubber diaphragm 24b having one end fixed to the vibrating piece 23 is alternately subjected to compression (reduction) and tension (increase), and the air in the diaphragm chamber 24c is accompanied with this action. When a is compressed / expanded, the suction valve 24d is opened at the time of tension (increase in volume), the discharge valve 24e is closed, and the air a is sucked into the diaphragm chamber 24c, and at the time of compression (reduction in volume) While the valve 24d is closed, the discharge valve 24e is opened, and the air a in the diaphragm chamber 24c is sent out of the case body 1 through the air discharge port 24g.
[0005]
The air pump P has an excellent effect that the structure is simple and can be manufactured at a low cost, and the air discharge amount can be stably operated with a substantially constant air discharge amount.
[0006]
However, many problems remain in this type of air pump P, and a particularly important problem is that the noise is relatively high.
That is, when the noise level of the surrounding environment such as daytime is relatively high, the noise of the air pump P is not a problem. However, when the noise level of the surrounding environment is low, such as at night, the noise of the air pump P becomes a noise source that can not be ignored, disturbing sleep, teamwork, work, study, etc. It will make you feel.
[0007]
Therefore, in the technical field of the air pump P, various devices have been made so far in order to reduce the pump noise. For example, (1) a method for improving the airtightness of the case body 20 to prevent leakage of noise to the outside, (2) a method for fixing the electromagnet 21, the diaphragm pump 24, etc. to the case body 20 via a vibration isolator, and (3) Ingenuity, such as a method of performing both the above (1) and (2), is actually used.
[0008]
Thus, among the three types of noise prevention measures, the method most commonly used in practice is a method for improving the airtightness inside the case body 20. In this case, since the intake port (air inlet 26) for air a into the case body 20 cannot be sealed, the case body 20 is filled with a breathable filter material (for example, glass fiber). A configuration is adopted in which a packing material is interposed in the fitting portion of the lid body 25 and the both are tightly screwed to increase the airtightness of the internal space of the case body 20.
[0009]
By adopting the above-described hermetic configuration, the noise generated by the air pump P can be reduced considerably.
FIG. 17 shows noise measurement values of a conventional non-sealed air pump P. FIG. 18 shows the air pump P filled with a sealing material such as silicon resin in the same air pump P. This is the noise measurement value. 17 and 18 are measured in a noiseless room with a silencer attached to the outlet of the pump.
[0010]
As is clear from the comparison between FIG. 17 and FIG. 18, in the case of the air pump P having a hermetically sealed structure, the noise is greatly reduced at 60 Hz and greatly reduced at a frequency range of 200 Hz or higher. I know that.
On the other hand, the noise in the low frequency range of 60 Hz to 200 Hz does not decrease so much, and a considerable amount of noise remains. For this reason, when it is actually listened to by human ears, this becomes a considerable noise at night when the surrounding environment is relatively quiet. Therefore, simply having a sealed structure cannot be said to fundamentally solve the noise problem.
[0011]
In the noise reduction method (2), generally, the diaphragm pump 24, the vibrating piece 23, and the electromagnet 21 are fixed to the case body 20 via a vibration-proof rubber or the like, and a lid that serves as the base of the air pump P is used. The body 25 is made of rubber, and noise is reduced by adding a structural device to absorb vibrations.
[0012]
By the way, the method of weakening the noise source by suppressing the vibrations of the diaphragm pump 24, the vibration piece 23, and the electromagnet 21 using the above-described anti-vibration rubber or the like reduces the air propagation sound although the solid propagation sound decreases. Can not expect so much. Therefore, when actually measuring the noise of this type of anti-vibration type air pump P, it is possible to obtain only the same noise reduction effect as in the case of the air pump P having the sealed structure, and the number of parts increases. The result is that the noise cannot be reduced to a satisfactory level for an increase in manufacturing cost.
[0013]
[Problems to be solved by the invention]
According to the present invention, it is difficult to sufficiently reduce the noise in the region of about 200 Hz or less only by using the above-described problem in the conventional air pump, that is, (1) a structure using a sealed structure or a vibration-proof material. However, the problem of noise still remains, and (2) the use of anti-vibration materials increases the number of parts and increases the manufacturing cost of the pump. The object is to provide an air pump that can significantly reduce noise over a range from low frequency to high frequency without causing an increase in the size of the air pump, and that is inexpensive to manufacture.
[0014]
[Means for Solving the Problems]
Conventionally, in the technical field of air pumps, the pump noise has been caused by vibrations such as vibrating pieces with fixed electromagnets or permanent magnets, diaphragms, etc. Therefore, noise can be reduced by suppressing these vibrations. Has been considered.
However, as described above, the inventor of the present application has found that the noise in this type of air pump cannot be obtained even if the vibration of the electromagnet or the like is suppressed by a vibration isolating rubber or the like. It has been found that the generation source is not only the vibration of the electromagnet or the like.
Therefore, the inventor of the present application conducted various noise reduction experiments based on the above knowledge, and from the experimental results, the first noise generation source of the air pump was caused by the suction valve and the discharge valve of the diaphragm pump. I found it.
[0015]
  The present invention was created through the process as described above, and the invention of claim 1 of the present invention divides the internal space of the case body whose back side is open into two chambers, a pump chamber and a silencer chamber,In the pump chamber, an electromagnet, a collision type filter that captures dust and dirt by collision with air, and a passage type filter that captures dust and dirt by passage of air, respectively.In addition, a pair of vibrating pieces each having a permanent magnet or a magnetic material fixed thereto and a pair of diaphragm pumps driven by each vibrating piece are arranged symmetrically, and the back side opening of the case body is provided. Sealed with a lid and communicates with the pump chamberOf the case bodyCommunicates with air inlet and silencerOf the case bodyAn air pump in which the internal space of the case body is sealed except for the air outlet port, and both diaphragm pumps are vibrated synchronously in the direction of approaching and separating by the electromagnetic force of the electromagnet. Drive each of the air introduced into the pump chamber from the air inlet.After colliding with the impingement filter, pass it through the pass filter, thenA structure in which the air is sucked into the diaphragm chamber through the air suction ports of both diaphragm pumps, the air in both diaphragm chambers is discharged into the muffler chamber through the air discharge port, and the air is led out of the case body through the air outlet port from the muffler chamber. It is characterized by that.
[0016]
According to the second aspect of the present invention, the pump chamber and the air suction ports of the two diaphragm pumps are connected to each other via an air suction communication passage formed in the lid body and an air suction passage formed in the wall portion of the case body. Each communicates with each other, and the silencer chamber and each air discharge port of both diaphragm pumps communicate with each other via an air discharge communication passage formed inside the lid body and an air discharge passage formed in the wall portion of the case body. There is a feature in that.
[0018]
  Of the present inventionClaim 3The present invention is characterized in that the density in the thickness direction of the impingement filter and the pass filter is gradually changed from a low density to a high density along the direction of air flow.
[0019]
  Of the present inventionClaim 4The present invention is characterized in that a sound-absorbing body is filled in the sound-absorbing chamber of the case body.
[0020]
  Of the present inventionClaim 5This invention is characterized in that the sound absorber is made of glass wool, felt or foamed aluminum.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 11 show an air pump P according to a first embodiment of the present invention. The air pump P has an electromagnet 2 and a permanent magnet in an internal space of a case body 1 whose back side is open. A pair of vibrating pieces 4 to which the magnet 3 is fixed, a pair of diaphragm pumps 5, a collision type filter 6, and a passing type filter 7 are provided, respectively, and the back side opening of the case body 1 is sealed with a lid body 8. Thus, the inside of the case body 1 is in a substantially perfect sealed state.
In FIGS. 1 and 2, 9 is a sealing member, 10 is a power cord, and 11 is a rubber cushion.
[0022]
As shown in FIGS. 6 to 8, the case main body 1 is formed in a box shape whose back side is opened by a synthetic resin material, and its internal space is divided into two chambers, a pump chamber 1b and a silencer chamber 1c, by a partition wall 1a. It is divided. The size of the sound deadening chamber 1c forms an expansion type sound deadening chamber, so it is more convenient as the inner volume is larger. However, the inner volume is about 1/5 to 1/8 of the total inner volume of the case body 1. If there is, sufficient noise reduction is possible.
In addition, air suction passages 1d having one end opened to the pump chamber 1b and the other end opened to the lower end surface of the case body 1 are formed in the opposite side walls of the case body 1 so as to face each other. The opening end of each air suction passage 1d on the pump chamber 1b side is opened at a position where it can communicate with the air suction port 5a of the diaphragm pump 5 when the diaphragm pump 5 is mounted and fixed in the pump chamber 1b. Has been.
Furthermore, air discharge passages 1e having one end opened to the pump chamber 1b and the other end opened to the lower end surface side of the case body 1 are opposed to each other inside the side walls formed with the air suction passage 1d. The opening end of each air discharge passage 1e on the pump chamber 1b side is located at a position where it can communicate with the air discharge port 5b of the diaphragm pump 5 when the diaphragm pump 5 is mounted and fixed in the pump chamber 1b. It is open.
6 to 8, reference numeral 12 denotes an air introduction pipe which is inserted and fixed in the side wall portion of the case body 1 and forms an air introduction port 12a communicating with the pump chamber 1b. Reference numeral 13 denotes a side wall portion of the case body 1. An air outlet pipe that is inserted and fixed to form an air outlet 13a that communicates with the sound deadening chamber 1c, 1f is an outlet of the power cord 10 formed on the side wall of the case body 1, and 1g is an end face of the lower end of the case body 1. It is the formed screw insertion hole.
[0023]
As shown in FIGS. 3 and 4, the electromagnet 2 has a structure in which a coil 2b is provided at the center of an E-shaped yoke 2a formed by laminating steel plates, and a screw is provided in the pump chamber 1b of the case body 1. 14 is fixed.
Further, a power cord 10 inserted through the drawer opening 1 f of the case body 1 is connected to the coil 2 b portion of the electromagnet 2.
[0024]
As shown in FIGS. 3 and 4, the pair of vibrating pieces 4 are formed symmetrically by a metal plate, and are disposed in the pump chamber 1 b of the case body 1 so as to face each other. It is supported freely. That is, both vibrating pieces 4 are supported by the case main body 1 so as to be swingable by inserting the base end side into a rubber support member 15 fixed in the pump chamber 1b, and the base end side is a fulcrum. Thus, it can be swung in the direction of the arrow B shown in FIG.
Further, the permanent magnet 3 is fixed to the tip portions of both vibrating pieces 4 in a state of being close to the electromagnet 2. The two permanent magnets 3 are fixed to the vibrating piece 4 so that the same magnetic pole faces the electromagnet 2, and face the opening of the E-shaped yoke 2 a of the electromagnet 2.
Therefore, when the electromagnet 2 is operated by applying an AC voltage to the electromagnet 2, both the vibrating pieces 4 vibrate in the directions of arrows 1 and 2 shown in FIG. 3 due to the electromagnetic force acting between the electromagnet 2 and both the permanent magnets 3. become. That is, since both the vibrating pieces 4 have the same direction of the magnetic poles of the permanent magnet 3 and the permanent magnet 3 faces the opening of the E-type yoke 2a of the electromagnet 2, the arrows i in FIG. As shown in (b), the two diaphragm pumps 5 are synchronously brought into an air suction state and an air discharge state.
[0025]
As shown in FIGS. 3 to 5, the pair of diaphragm pumps 5 are formed in a bag shape that forms a diaphragm chamber 5d between a pump case 5c having an air suction port 5a and an air discharge port 5b, and the pump case 5c. A rubber diaphragm 5e, a suction valve 5f provided on the air suction port 5a side of the pump case 5c, and a discharge valve 5g provided on the air discharge port 5b side of the pump case 5c, respectively.
[0026]
The two diaphragm pumps 5 are arranged symmetrically with respect to the longitudinal center line in the pump chamber 1b of the case body 1, and the air suction port 5a is the open end of the air suction passage 1d on the pump chamber 1b side. In addition, the air discharge port 5b is attached and fixed to the side wall portion of the case body 1 with screws 16 in a state where the air discharge port 5b communicates with the opening end portion of the air discharge passage 1e on the pump chamber 1b side.
Further, each diaphragm 5 e of both diaphragm pumps 5 is connected and fixed to an intermediate portion of the vibrating piece 4 by a screw 17.
[0027]
Thus, in the two diaphragm pumps 5, the two vibrating pieces 4 vibrate in the directions of arrows A and B shown in FIG. 3, and the bag-like diaphragm 5e is alternately compressed (reduced volume) and tensioned (increased volume). As a result, the air a in the diaphragm chamber 5d is compressed / expanded, and the suction valve 5f is opened and the discharge valve 5g is closed and the air a is closed in the diaphragm chamber. Inhaled into 5d, and when compressed (reduced volume), the suction valve 5f is closed and the discharge valve 5g is opened so that the air a in the diaphragm chamber 5d is discharged from the air discharge port 5b. ing.
[0028]
As shown in FIGS. 9 to 11, the lid 8 is formed in a substantially rectangular plate shape by a synthetic resin material, and seals the opening on the back side of the case main body 1 so that the pump chamber 1 b and the silencer chamber 1 c are formed. A substantially complete sealed state is obtained. That is, as shown in FIGS. 4 and 5, the lid 8 has a plate-like seal member 9 (packing) interposed between the lid 8 and the lower end surface of the case body 1, and the lid 8 is attached to the case with screws 18. By tightening and fixing to the main body 1 side, the internal space of the case main body 1 can be brought into a substantially complete sealed state.
In addition, when the lid 8 is attached and fixed to the case body 1 inside the lid 8, the pump chamber 1b and the opening end on the lower end surface side of the case body 1 of each air suction passage 1d are in communication with each other. A pair of air suction communication passages 8a are formed.
Further, when the lid 8 is attached and fixed to the case body 1, the sound deadening chamber 1c and the opening end portion on the lower end surface side of the case body 1 of each air discharge passage 1e are in communication with each other. An air discharge communication passage 8b having a substantially T-shaped planar shape is formed.
In FIG. 9, reference numeral 8 c denotes a lid mounting screw hole formed in the lid body 8.
[0029]
The collision filter 6 and the pass filter 7 capture dust and dirt in the air flowing into the pump chamber 1b from the air inlet 12a, and the dust and dirt enter the diaphragm pump 5 and each passage. Is to prevent.
That is, as shown in FIGS. 3 to 5, the collision filter 6 is disposed in the pump chamber 1b so as to face the air inlet 12a. The passing filter 7 is disposed in the pump chamber 1b so as to surround the opening end of each air suction communication passage 8a formed in the lid 8 on the pump chamber 1b side.
Accordingly, the air a flowing into the pump chamber 1b from the air inlet 12a first collides with the collision filter 6, where dust and dust in the air are removed to some extent, and then pass through the passage filter 7. Here, after the remaining dust and dirt in the air are almost completely removed, the dust flows into the diaphragm pump 5 side.
The collision filter 6 and the pass filter 7 are both made of synthetic fibers whose density in the thickness direction changes from low density to high density along the direction in which the air a flows.
[0030]
In the air pump P, between the outlet 1f of the power cord 10 and the power cord 10, between the case body 1 and the air introduction pipe 12, and between the case body 1 and the air outlet pipe 13, respectively. Sealing material (not shown) such as silicon resin is injected to improve the airtightness of the internal space of the case body 1.
[0031]
Next, the operation of the air pump P will be described.
When the diaphragm pumps 5 are operated, the air a flowing into the pump chamber 1b through the air introduction port 12a of the case body 1 first collides with the collision filter 6 and then passes through the passage filter 7. Then, the air is sucked into the diaphragm chamber 5d through the air suction communication path 8a, the air suction path 1d, the air suction port 5a of the diaphragm pump 5 and the suction valve 5f.
Further, the air a sucked into the diaphragm chamber 5d is operated from the diaphragm chamber 5d through the discharge valve 5g, the air discharge port 5b, the air discharge passage 1e and the air discharge communication passage 8b by the operation of both diaphragm pumps 5. And is supplied into the water tank (not shown) through the air outlet 13a and a discharge hose (not shown) connected thereto.
[0032]
Thus, in the air pump P, when both the diaphragm pumps 5 are operated, the intake valve 5f and the discharge valve 5g are operated, whereby the air a pulsates and noise is generated. This noise is transmitted to the air suction port 5a and the air discharge port 5b.
However, the noise propagated in the direction of the air suction port 5a is attenuated while propagating through the air suction passage 1d, the air suction communication passage 8a, and the pump chamber 1b, and the noise is greatly reduced.
Similarly, the noise propagated in the direction of the air discharge port 5b is attenuated while propagating through the air discharge passage 1e, the air discharge communication passage 8b, and the silencing chamber 1c, and the noise is greatly reduced.
Thus, in the air pump P, the noise generated by the operation of the suction valve 5f and the discharge valve 5g is attenuated while passing through the silencer chamber 1c and the pump chamber 1b forming a so-called expansion silencer. The sound leakage to the outside (the air inlet 12a and the air outlet 13a) is greatly reduced.
[0033]
When both diaphragm pumps 5 are operated, both vibrating pieces 4 vibrate in the directions of arrows 1 and 2 shown in FIG. 3 by the electromagnetic force acting between the electromagnet 2 and both permanent magnets 3, but both vibrating pieces 4 are synchronous. And vibrate in the directions of approaching and separating from each other. As a result, vibrations generated from both diaphragm pumps 5 cancel each other and become a value close to substantially zero. Accordingly, the vibration of the air pump P itself is almost eliminated, and no noise is generated even if the case main body 1 or the lid body 8 comes into contact with other external objects.
[0034]
In this way, the noise and vibration generated from the air pump P itself are extremely small compared to this type of pump, and even if the pump is operated in a quiet environment such as at night, human noise is generated by the pump noise. Almost never disturbs sleep or feels uncomfortable.
[0035]
And in the said air pump P, there can exist the following effects other than the effect mentioned above.
That is, since the air a flowing into the pump chamber 1b collides with the collision filter 6 and then passes through the passage filter 7, dust and dust contained in the air are separated from the collision filter 6 with each other. The trapping filter 7 is trapped in two stages, and the dust and dust trapping efficiency is greatly improved. However, since the filters 6 and 7 are used in which the density in the thickness direction has changed from low density to high density along the direction of air a, the dust and dust capture efficiency is further improved. Will improve.
Further, even if dust or dust is trapped in the collision filter 6 and the collision filter 6 is clogged, it does not adversely affect the flow of air a in the pump chamber 1b.
Furthermore, since dust and dirt in the air that has flowed into the pump chamber 1b are captured by the collision filter 6, the air a is allowed to pass through the pass filter 7, so that the pass filter 7 can be used in a short time. The passing filter 7 can be used for a long time without causing clogging.
[0036]
12 to 13 show an air pump P according to a second embodiment of the present invention. The air pump P is filled with a breathable sound absorber 19 in a silencer chamber 1c of the case body 1. FIG. Is. The sound absorber 19 is made of glass wool, felt, aluminum foam or the like.
The air pump P has the same structure and the same shape as the air pump P in the first embodiment except that the sound absorbing chamber 19 is filled in the sound deadening chamber 1c.
Since the air pump P is filled with the sound absorbing body 19 in the sound deadening chamber 1c, the noise can be reduced more reliably.
[0037]
FIG. 14 shows the noise characteristics of the air pump P according to the first embodiment of the present invention and the conventional non-hermetic air pump shown in FIG.
The discharge air amount and discharge pressure of the air pump P according to the present invention and the conventional unsealed air pump are selected to be the same, and the total volume (outer dimensions) of the case body 1 is also selected to be the same.
The noise characteristics are measured using the same measuring device, the same distance (no noise room), the same distance between the microphone and the pump (about 15 cm and about 50 cm), and in the case of a conventional product, the discharge It is measured with an expansion silencer having a capacity of about 15 cc attached to the opening on the side.
[0038]
A curve A in FIG. 14 shows the F characteristic measured with the distance between the non-sealed pump P and the microphone set to 15 cm. Curves B and C show F characteristics measured with the distance between the pump P and the microphone of the present invention being 15 cm and 50 cm. Further, the curve D shows the A characteristic measured with the distance between the pump P and the microphone of the present invention as 50 cm.
[0039]
The F characteristic is called a flat characteristic, and is obtained by measuring and displaying noise with physical sound pressure. The A characteristic is a characteristic displayed in consideration of the noise actually felt by the human ear, and the actual A characteristic is displayed with the A characteristic. In this case, if the noise is 30 dB or less in A characteristic, a person can sleep well without worrying about the noise at all.
[0040]
  SaidFIG.As is clear from the comparison between the curve A and the curve B, the air pump P according to the present invention can significantly reduce the noise value as compared with the conventional product.
  Further, as apparent from the curve D measured by the A characteristic, the average noise value is approximately 10 to 15 dB in the low frequency region below 200 Hz, and 5 to 5 in the high frequency region above 200 Hz. As a result, even if the air pump is operated when the surrounding environment is quiet, such as at night, noise is hardly felt, and no discomfort due to noise is felt at all.
[0041]
In each of the above embodiments, the lid body 8 is made of a synthetic resin material. In other embodiments, the lid body 8 is made of an elastic rubber material. Also good.
[0042]
In each of the above embodiments, a plate-shaped sealing member 9 is interposed between the case body 1 and the lid body 8, and the case body 1 and the lid body 8 are fastened and fixed by screws 18. However, in another embodiment, the lid body 8 is fitted to the lower end portion of the case body 1 and a sealing material such as silicon resin is injected into the fitting portion. You may make it seal between the main body 1 and the cover body 8. FIG.
[0043]
In each of the above-described embodiments, the air a flowing into the pump chamber 1b from the air inlet 12a on the side wall of the case body 1 is collided with the collision filter 6, and then the pass filter 7, the diaphragm pump 5, The sound is circulated in the order of the muffler chamber 1c and discharged from the air outlet 13a provided on the side wall of the muffler chamber 1c. However, the flow direction of the air a is reversed and the position of the collision filter 6 is changed. (Into the silencer 1c), after the air a taken into the silencer 1c is processed by the collision filter 6, the diaphragm pump 5, the pump chamber 1b, and the pass filter 7 are passed through in this order from the side wall of the pump chamber 1b to the outside. You may make it discharge.
[0045]
In each of the above embodiments, the permanent magnet 3 is fixed to the vibrating piece 4. In other embodiments, a magnetic material such as a mild steel piece is fixed to the vibrating piece 4. Also good.
[0046]
In each of the above embodiments, the diaphragm 5e is made of rubber. However, in other embodiments, it may be made of a synthetic resin having elasticity or a metal thin plate material.
[0047]
【The invention's effect】
  As described above, according to the first aspect of the present invention, the internal space of the case body is divided into the pump chamber and the silencer chamber, and a pair of diaphragm pumps are built in the pump chamber, and external air is passed through the pump chamber. Since the air is sucked into the diaphragm pump and the air from the diaphragm pump is discharged to the outside through the silencer chamber, the sound generated from the suction valve and the discharge valve of the diaphragm pump, which is the largest source of pump noise, is pumped. It will be effectively silenced in the room and the muffler room. As a result, it is possible to reduce the noise of the air pump economically and to the extent that the noise can hardly be felt without requiring an external silencer.
  or,The invention of claim 1 of the present inventionEach diaphragm pump and a pair of vibrating pieces for driving them are arranged symmetrically in the case body, and both vibrating pieces vibrate synchronously in the directions approaching and separating from each other. The vibrations of the diaphragm pump cancel each other and become a value close to substantially zero. Therefore, the vibration of the air pump itself is almost eliminated, and no noise is generated even if the case main body or the lid comes into contact with other external objects.
  Furthermore,The invention of claim 1 of the present inventionSince the air inlet and air outlet are provided on the side wall of the case body, the infinite space volume is connected to the outside of the air inlet and air outlet, and the air inlet etc. Compared with the case where the pump is provided, the pump noise becomes smaller.
  Moreover, according to the first aspect of the present invention, a collision type filter for capturing dust and dirt by collision with air and a passing type filter for capturing dust and dirt by passage of air are disposed in the pump chamber. Since the air introduced into the pump chamber from the air inlet is made to collide with the collision filter and then pass through the passage filter, and then guided to both diaphragm pumps, dust and dust in the air are collided filter. And the passage type filter are surely captured, and the capture efficiency can be greatly improved. Further, even if dust or dust is trapped in the collision filter and the collision filter is clogged, there is no adverse effect on the air flow in the pump chamber. In addition, after trapping dust and dirt in the air with a collision type filter, this air is allowed to pass through the passing filter, so that the passing filter does not cause clogging in a short time and passes through. The expression filter can be used for a long time.
[0048]
According to a second aspect of the present invention, the pump chamber and the air suction ports of the two diaphragm pumps are respectively connected via an air suction communication passage formed in the lid body and an air suction passage formed in the wall portion of the case body. The silencer chamber and the air discharge ports of both diaphragm pumps communicate with each other via an air discharge communication passage formed in the lid and an air discharge passage formed in the wall of the case body. Therefore, there is no trouble in assembling the air pump and the air pump can be manufactured at a lower cost.
[0050]
  Of the present inventionClaim 3The invention uses a collision type filter and a pass type filter whose density in the thickness direction gradually changes from low density to high density along the direction of air flow. It will be further improved.
[0051]
  Of the present inventionClaims 4 and 5In this invention, since the sound-absorbing chamber of the case main body is filled with a breathable sound absorber such as glass wool, felt or foamed aluminum, the pump noise is further reduced.
[Brief description of the drawings]
FIG. 1 is a front view of an air pump according to a first embodiment of the present invention.
FIG. 2 is a bottom view of the air pump.
FIG. 3 is a partially cutaway bottom view of the air pump with a lid and a seal member removed.
4 is a cross-sectional view taken along line AA in FIG.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a bottom view of the case body of the air pump.
7 is a cross-sectional view taken along line CC in FIG.
8 is a cross-sectional view taken along the line DD of FIG.
FIG. 9 is a plan view of the lid of the air pump.
10 is a cross-sectional view taken along line EE of FIG.
11 is a cross-sectional view taken along line FF in FIG.
FIG. 12 is a partially cutaway bottom view showing an air pump according to a second embodiment of the present invention, with a lid and a seal member removed.
FIG. 13 is a longitudinal sectional view of an air pump according to a second embodiment of the present invention.
FIG. 14 shows noise characteristics of the air pump according to the first embodiment of the present invention and a conventional unsealed air pump.
FIG. 15 is a partially cutaway bottom view showing a state in which a lid of a conventional air pump is removed.
FIG. 16 is a longitudinal sectional view of a conventional air pump.
FIG. 17 is a noise measurement diagram of a conventional non-hermetic air pump.
FIG. 18 is a measurement diagram of a conventional sealed air pump P noise.
[Explanation of symbols]
P is an air pump, a is air, 1 is a case body, 1b is a pump chamber, 1c is a silencer chamber, 1d is an air suction passage, 1e is an air discharge passage, 2 is an electromagnet, 3 is a permanent magnet (magnetic material), 4 Is a diaphragm, 5 is a diaphragm pump, 5a is an air suction port, 5b is an air discharge port, 5d is a diaphragm chamber, 6 is a collision filter, 7 is a pass filter, 8 is a lid, 8a is an air suction communication path, 8b is an air discharge communication path, 12a is an air inlet, 13a is an air outlet, and 19 is a sound absorber.

Claims (5)

The inner space of the case body (1) with the back side opened is divided into two chambers, a pump chamber (1b) and a muffler chamber (1c). An electromagnet (2) and air (a) are placed in the pump chamber (1b). A collision filter (6) that captures dust and dirt by collision with the air and a pass-through filter (7) that captures dust and dirt by the passage of air (a) and a permanent magnet (3) or magnetic A pair of vibrating pieces (4) each having a fixed body and a pair of diaphragm pumps (5) driven by the vibrating pieces (4) are arranged symmetrically, and the back side of the case body (1) air opening lid (8) the pump chamber and sealed by the air inlet of the case body which communicates into (1b) (1) (12a) and the silencer chamber case body communicating to (1c) in (1) The interior of the case body (1) except for the outlet (13a) In which the diaphragms (4) are synchronously vibrated toward and away from each other by the electromagnetic force of the electromagnet (2) to drive the diaphragm pumps (5), respectively. Air (a) introduced into the pump chamber (1b) from the air inlet (12a) collides with the collision filter (6) and then passes through the passage filter (7), and then the diaphragm pumps (5). While sucking into the diaphragm chamber (5d) through the air suction port (5a), the air (a) in both diaphragm chambers (5d) is discharged into the sound deadening chamber (1c) through the air discharge port (5b), respectively. An air pump characterized in that air (a) is led out from the case body (1) through the air lead-out port (13a) from the silencer chamber (1c).   The pump chamber (1b) and the air suction ports (5a) of both diaphragm pumps (5) are connected to the air suction communication path (8a) formed inside the lid (8) and the wall of the case body (1). The air suction passages (1d) thus formed communicate with each other, and the muffler chamber (1c) and the air discharge ports (5b) of both diaphragm pumps (5) are formed inside the lid (8). 2. The air pump according to claim 1, wherein the air pump communicates via an air discharge passage (8 b) and an air discharge passage (1 e) formed in a wall portion of the case body (1). The air according to claim 1 , wherein the density in the thickness direction of the impingement filter (6) and the pass filter (7) is gradually changed from a low density to a high density along a direction in which the air flows. pump.   The air pump according to claim 1 or 2, characterized in that the sound-absorbing chamber (1c) of the case body (1) is filled with a breathable sound absorber (19). The air pump according to claim 4 , wherein the sound absorber (19) is made of glass wool, felt or foamed aluminum.

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