JP6199150B2 - Pump with exhaust mechanism - Google Patents

Description

  The present invention relates to a diaphragm pump including a pump chamber that is formed by, for example, a diaphragm and expands and contracts.

  Conventionally, a crank base that rotates as the output shaft of the motor rotates, a drive body that swings in conjunction with the rotation of the crank base, and a diaphragm that has a diaphragm portion that reciprocates by the swing of the drive body are provided. There is a diaphragm pump in which the pump chamber formed by the diaphragm portion contracts and expands as the diaphragm portion reciprocates, and air sucked from the suction port is discharged from the discharge port via the pump chamber ( For example, see Patent Document 1).

JP 2003-272476 A

  By the way, in the conventional diaphragm pump, as shown in FIG. 1 of Patent Document 1, the discharge side valve hole 44 of the valve holder 40 is closed by the discharge side valve body 35, and the pump chamber 55 is contracted when the pump chamber 55 is contracted. 55 air pushes up the peripheral portion of the discharge side valve body 35 from the discharge side valve hole 44 and is discharged from the discharge port 47 of the cylindrical body 45, but the air flowing out from the discharge side valve hole 44 is the peripheral edge of the discharge side valve body 35. As a result of the collision with the part, there is a problem that the resistance against the air becomes large and the peripheral part vibrates with the air and generates a large noise.

  Further, in a general conventional diaphragm pump, as shown in FIG. 4, the engagement convex portion 111 a of the partition plate 111 disposed between a diaphragm holder (not shown) and the lid body is engaged with the engagement convex portion. A mountain valve 112a of the valve body 112 is mounted so as to close the peripheral surface of the portion 111a. A discharge space 120 communicating with a discharge port of a lid (not shown) is formed above the valve body 112.

  A discharge side valve hole 111b is formed in the vicinity of the engaging convex portion 111a of the partition plate 111, and the discharge side valve hole 111b is positioned below the mountain valve 112a. The discharge side valve hole 111 b of the partition plate 111 is communicated with a pump chamber 110 formed by the partition plate 111 and each diaphragm portion of a diaphragm (not shown) disposed below the partition plate 111.

  A space 113 is formed between the angle valve 112a of the valve body 112 and the peripheral surface of the engaging convex portion 111a of the partition plate 111, and the space 113 and the discharge side valve hole 111b communicate with each other.

  Therefore, when the diaphragm portion is lowered and the pump chamber 110 is expanded, the pump chamber 110 is in a negative pressure state. At this time, air flows into the pump chamber 110 from the discharge space 120 through the discharge side valve hole 111b. The mountain valve 112a of the valve body 112 functions as a check valve for preventing the above.

  On the other hand, as shown in FIG. 5, when the diaphragm part rises and the pump chamber 110 contracts, the air pressure in the pump chamber 110 rises, and the tip 112s of the mountain valve 112a in the valve body 112 is partitioned. Since the space 113 and the discharge space 120 communicate with each other away from the peripheral surface of the engagement convex portion 111a of the plate 111, the air in the pump chamber 110 passes through the discharge side valve hole 111b and the space 113, and passes through the discharge space 120. Through the discharge port of the lid.

  However, in this case, when the air in the pump chamber 110 passes through the discharge side valve hole 111b and the space 113 toward the discharge space 120, the air flows along the arrow, so that it collides with the inner wall portion of the mountain valve 112a. After that, the direction is changed, and it flows into the discharge space 120 from the gap between the tip 112s of the mountain valve 112a and the peripheral surface of the engaging convex portion 111a of the partition plate 111.

  Thus, after the air flow is not straight but is bent at the inner wall portion of the mountain valve 112a, the gap between the tip 112s of the mountain valve 112a and the peripheral surface of the engaging projection 111a of the partition plate 111 is Since air flows out, the tip 112s of the mountain valve 112a vibrates, and there is a problem that noise is generated.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a pump with an exhaust mechanism that reduces noise when air is exhausted from a pump chamber.

  In order to achieve this object, the invention according to claim 1 includes a pump portion having a pump chamber, a partition plate provided above the pump portion and having a discharge hole communicating with the pump chamber, and a tip portion thereof. A valve body for discharge provided corresponding to the discharge hole having a U-shaped valve having a U-shaped cross-sectional shape at the front end, and provided corresponding to the discharge hole and the U-shaped valve A discharge port connected to the discharge hole, and when the discharge column is inserted into the discharge hole, the tip of the U-shaped valve is brought into contact with the discharge column. The pump chamber is sealed, and a lid body that exhausts the fluid in the pump chamber from the discharge port when the tip of the U-shaped valve is separated from the discharge column, The discharge struts are linear along the direction of fluid flowing from the pump chamber. And the circumferential surface portion, the leading end to have a tapered portion that is tapered.

  In the invention according to claim 2, the U-shaped valve functions as a check valve for the pump chamber when the tip end portion is in contact with the peripheral surface of the discharge column.

  In the invention according to claim 3, the diameter of the discharge column is made larger than the diameter of the opening of the tip of the U-shaped valve.

  According to the invention of claim 1, when the discharge column is inserted into the discharge hole, the tip of the U-shaped valve is brought into contact with the discharge column to seal the pump chamber, and the tip of the U-shaped valve Since the fluid from the pump chamber flows straight along the straight peripheral surface of the discharge strut and is exhausted when it is separated from the discharge strut, vibration at the tip of the U-shaped valve is suppressed and noise is reduced. Can be reduced.

  According to the invention of claim 2, since the U-shaped valve functions as a check valve of the pump chamber when the tip end is in contact with the peripheral surface of the discharge column, the sealing performance is maintained. Can do.

  According to the invention of claim 3, since the diameter of the discharge strut is larger than the diameter of the opening of the front end portion of the U-shaped valve, the front end portion of the U-shaped valve is brought into contact with the peripheral surface of the discharge strut Sometimes the sealing performance of the pump chamber is ensured.

It is sectional drawing which shows the structure of the diaphragm pump which concerns on this invention. It is an expanded sectional view which shows the structure of the exhaust mechanism which consists of a cover body, a partition plate, and a valve body of the diaphragm pump which concerns on this invention. It is an expanded sectional view with which explanation of the flow of air in the exhaust mechanism of the diaphragm pump concerning the present invention is provided. It is an expanded sectional view which shows the structure of a partition plate and a valve body in the conventional diaphragm pump. It is an expanded sectional view with which it uses for description when air flows through the partition plate and valve body of the conventional diaphragm pump.

  Embodiments of the present invention will be described below.

<Configuration of diaphragm pump>
As shown in FIGS. 1 and 2, a three-cylinder negative pressure type diaphragm pump 200 includes a motor 202 fixed to the outside of a bottom portion of a case 203 formed in a substantially bottomed cylindrical shape. The output shaft 202a of 202 protrudes into the case 203 from the hole of the case 203, and a crank base 204 is pivotally attached to the protruding end portion of the output shaft 202a.

  One end of a drive shaft 205 that is inclined with respect to the axial direction of the output shaft 202a is attached to a portion of the crank base 204 that is eccentric from the output shaft 202a of the motor 202, and the other end of the drive shaft 205 is attached to the crank base 204. The drive body 206 is fitted into a non-through hole 207a of a bearing portion 207 fixed integrally with the boss 206a of the drive body 206. That is, the drive body 206 is pivotally supported with respect to the drive shaft 205.

  The boss 206a of the driving body 206 has three driving elements 208 (only two driving elements 208 are shown) so as to be substantially orthogonal to the non-through holes 207a of the bearing portion 207. It is formed in a slightly inclined state, and a diaphragm portion mounting hole 208 a is provided at the tip of each driver 208.

  A diaphragm holder 210 formed in a cup shape with a lower opening is placed on the upper end portion of the case 203, and is equiangular (120 degrees) with each other in the circumferential direction to hold each diaphragm portion 217 of a diaphragm 215 to be described later. ) Three diaphragm portion holding holes 211 formed at intervals (only two diaphragm portion holding holes 211 are shown) are provided.

  The diaphragm 215 is made of a flexible material such as rubber, and is provided with three diaphragm portions 217 (only two diaphragm portions 217 are shown) provided at equal angular intervals in the circumferential direction and opened upward. The diaphragm portion 217 is integrally formed with a flange 227 formed in a substantially disc shape that continuously connects the upper end portion of the diaphragm portion 217.

  A piston 219 having a substantially conical section is integrally formed on the lower surface of each diaphragm portion 217, and a locking convex portion 219b is integrally formed on the lower portion of the piston 219 via a narrow neck portion 219a. Has been.

  A partition plate 230 is fixed on the upper surface of the flange 227 of the diaphragm 215. In this partition plate 230, three suction holes 232 (only two suction holes 232 are shown) communicating with the respective pump chambers 235 are formed at equal angular intervals (120 degrees) in the circumferential direction.

  Further, the partition plate 230 is formed with three discharge holes 233 (only two discharge holes 233 are shown) communicating with each pump chamber 235 so as to penetrate at an equal angle (120 degrees) in the circumferential direction. The three discharge holes 233 are arranged on the inner peripheral side with respect to the three suction holes 232, and the three suction holes 232 and the three discharge holes 233 correspond to the respective pump chambers 235. Is positioned.

  The diaphragm 215 is inserted into the diaphragm mounting hole 208a of each driver 208 of the driving body 206 while elastically deforming the convex portion 219b of each diaphragm 217, so that the neck 219a becomes the diaphragm mounting hole 208a of the driver 208. Attached to.

  Here, as a result of the diaphragm 215 being sandwiched between the partition plate 230 and the diaphragm holder 210, three pump chambers 235 are formed between the partition plate 230 and each diaphragm portion 217 of the diaphragm 215. The diaphragm unit 210, the diaphragm 215, the crank base 204, the drive shaft 205, the drive body 206, the case 203, the motor 202, and the like constitute a pump unit.

  The partition plate 230 is integrated with a suction and discharge valve body 260 as a discharge valve body formed in a substantially flat plate shape by a flexible material such as rubber. The upper end surface of the discharge valve body 260 is aligned at the same height.

  In the portion of the suction / discharge valve body 260 corresponding to the three suction holes 232 in the partition plate 230, each of the pump chambers 235 has a mountain-shaped valve 260 a that is opened in a circular shape and is tapered toward the tip. Three U-shaped valves 260b having a lower end opened in a circular shape and curved in a U-shape toward the distal end are formed inside the mountain-shaped valve 260a so as to correspond to the three. Three are formed to correspond to H.235.

  Here, the U-shaped valve 260b of the suction and discharge valve body 260 has an R portion 260r that is folded back into a U shape after the tip is once directed downward, and the tip 260s is directed upward. Is maintained at. In a state where the U-shaped valve 260b is not in contact with a discharge column 246 of the lid 240 described later (a state where no force is applied to the U-shaped valve 260b), the opening of the distal end portion 260s has a diameter D. It is formed to become. However, in FIG. 2, the U-shaped valve 260b is in contact with the discharge column 246 of the lid 240 (the diameter D is enlarged by the U-shaped valve 260b).

  Here, since the suction / discharge valve body 260 is formed of a flexible material such as rubber, when the tip portion 260s of the U-shaped valve 260b is elastically deformed, the opening is in the original state of the diameter D. It is configured so that the force to return to work.

  In the state where the suction / discharge valve body 260 is integrated with the partition plate 230, the mountain-shaped valve 260 a is positioned in the suction hole 232 of the partition plate 230, and the U-shaped valve 260 b is the discharge hole of the partition plate 230. 233.

  A lid 240 formed in a flat box shape with an opening at the bottom is attached to the upper end of the partition plate 230. A cylindrical discharge tube portion 243 in which a discharge port 242 is formed is erected at the center portion on the upper surface side of the lid 240. The discharge cylinder portion 243 communicates with the discharge hole 233 of the partition plate 230 via the discharge space 241.

  A partition wall 247 formed in an annular shape in plan view so as to surround the discharge cylinder portion 243 is provided on the back surface side of the lid body 240, and when the lid body 240 is attached to the partition plate 230, The tip of the partition wall 247 is brought into contact with the upper end surface of the suction / discharge valve body 260 of the partition plate 230. That is, in the lid 240, the inner space of the partition wall 247 is formed as the discharge space 241, and the outer space of the partition wall 247 is formed as the suction space 252. Note that a suction hole 249 communicating with the suction space 252 is formed in the lid 240.

  In the discharge space 241 of the lid 240, for example, three columnar discharge columns 246 protrude downward from the back surface of the lid 240 so as to correspond to the pump chambers 235. Is attached to the partition plate 230, the discharge column 246 of the lid 240 is inserted into the pump chamber 235 without contacting the discharge hole 233 of the partition plate 230.

  The discharge column 246 (FIG. 2) has a vertical (straight) peripheral surface portion 246a along the direction of air flowing from the pump chamber 235 (the straight direction of the arrow) as shown in FIG. The tip portion inserted first into the discharge hole 233 has a tapered portion 246b formed in a tapered shape.

  The diameter d1 of the peripheral surface portion 246a of the discharge column 246 is formed to be slightly larger than the diameter D of the opening of the distal end portion 260s of the U-shaped valve 260b, and the diameter d2 of the distal end of the tapered portion 246b is U-shaped valve. It is formed to be significantly smaller than the diameter D of the opening of the tip 260s of 260b. That is, the relationship d1> D> d2 is established.

  Further, in a state where the lid 240 is attached to the partition plate 230, the tip portion 260s of the U-shaped valve 260b of the suction / discharge valve body 260 is formed between the peripheral surface portion 246a of the discharge post 246 of the lid 240 and the tapered portion 246b. The length of the peripheral surface portion 246a from the back surface of the lid 240 is determined so as to contact the peripheral surface portion 246a in the vicinity of the boundary. In the discharge column 246, the portion where the tip portion 260 s of the U-shaped valve 260 b should function as the check valve of the pump chamber 235 is the peripheral surface portion 246 a, and it is not necessary to function as the check valve of the pump chamber 235. The portion is a tapered portion 246b.

  In the suction space 252 of the lid 240, for example, three columnar suction columns 245 protrude downward from the back surface of the lid 240 so as to correspond to the pump chambers 235. Is attached to the partition plate 230, the suction column 245 of the lid 240 is inserted into the pump chamber 235 without contacting the suction hole 232 of the partition plate 230.

  At this time, since the suction / discharge valve body 260 is integrally attached to the partition plate 240, when the lid 240 is attached to the partition plate 230, the tip of the mountain-shaped valve 260 a of the suction / discharge valve body 260 is moved. While being in contact with the peripheral surface of the suction column 245 of the lid 240, the tip portion 260 s of the U-shaped valve 260 b is in contact with the peripheral surface portion 246 a of the discharge column 246 of the lid 240.

  As a result, the check valve that restricts the flow of air from the pump chamber 235 through the suction hole 232 to the suction space 252 by the mountain-shaped valve 260a of the suction / discharge valve body 260 and the suction column 245 of the lid 240 is provided. In addition, the U-shaped valve 260 b of the suction / discharge valve body 260 and the discharge column 246 of the lid 240 constitute a check valve that restricts the flow of air from the discharge space 241 to the discharge hole 233.

  The diaphragm pump 200 includes an intake mechanism for sucking air into the pump chamber 235 and an exhaust mechanism for exhausting air from the pump chamber 235 by the partition plate 230, the suction / discharge valve body 260 and the lid body 240. Configure.

<Assembly operation of the exhaust mechanism in the diaphragm pump>
In the exhaust mechanism of the diaphragm pump 200, when the partition plate 230 is attached to the diaphragm holder 210, the diaphragm 215 is sandwiched between the partition plate 230 and the diaphragm holder 210, and thus the diaphragm portions 217 of the partition plate 230 and the diaphragm 215 are arranged. Three pump chambers 235 are formed between the two.

  When the lid 240 is attached to the partition plate 230 in which the suction / discharge valve body 260 is integrated, the suction column 245 of the lid 240 is provided on the opening side of the mountain-shaped valve 260a of the suction / discharge valve body 260. The discharge column 246 is positioned with respect to the distal end portion 260s of the U-shaped valve 260b.

  At this time, since the suction column 245 of the lid 240 is positioned on the opening side of the mountain valve 260a having a larger diameter than the suction column 245, the suction column 245 can be easily positioned with respect to the mountain valve 260a. Is called. At the same time, the discharge column 246 of the lid 240 is positioned with respect to the opening of the tip portion 260s of the U-shaped valve 260b. In this case, the discharge column 246 is positioned with respect to the U-shaped valve 260b with high accuracy. There is no need.

  The reason is that the tapered portion 246b of the discharge column 246 in the lid 240 is formed in a tapered shape, and the diameter d2 of the tapered portion 246b is significantly larger than the diameter D of the opening of the distal end portion 260s of the U-shaped valve 260b. This is because the tapered portion 246b of the discharge column 246 is easily inserted without colliding with the distal end portion 260s of the U-shaped valve 260b.

  By the way, while the tapered portion 246b of the discharge column 246 is inserted into the distal end portion 260s of the U-shaped valve 260b, the tapered portion 246b of the discharge column 246 collides with the distal end portion 260s of the U-shaped valve 260b, The tip portion 260s may be turned downward and bent by the tapered portion 246b.

  However, even in such a case, if the pump operation by the diaphragm portion 217 is started and air flows through the distal end portion 260s of the U-shaped valve 260b, the distal end portion of the U-shaped valve 260b is caused by the air flow. 260s returns to the original U shape. In this case, even if the tapered portion 246b of the discharge column 246 collides with the tip portion 260s of the U-shaped valve 260b, the R portion 260r of the U-shaped valve 260b plays the role of a cushioning material and the U-shaped Damage to the valve 260b is prevented.

  When the lid 240 is attached to the partition plate 230, the diameter d1 of the peripheral surface portion 246a of the discharge column 246 is formed to be slightly larger than the diameter D of the opening of the distal end portion 260s of the U-shaped valve 260b. The tip portion 260s is pressed against and brought into contact with the peripheral surface portion 246a of the discharge column 246, and the sealing performance of the pump chamber 235 is ensured.

  In this way, the chevron-shaped valve 260a of the suction / discharge valve body 260 is brought into contact with the peripheral surface of the suction column 245, and the tip portion 260s of the U-shaped valve 260b is brought into contact with the peripheral surface portion 246a of the discharge column 246. When the lid 240 is fixed to the partition plate 230 in the contact state, the intake mechanism and the exhaust mechanism (the partition plate 230, the intake / discharge valve body 260 and the lid 240) in the diaphragm pump 200 are assembled.

<Pump operation of diaphragm pump>
In the diaphragm pump 200 assembled in this way, when the motor 202 is driven to rotate the output shaft 202a, the crank base 204 also rotates integrally with the output shaft 202a, and the output shaft remains in a state where the drive shaft 205 is inclined. In order to rotate around 202a, the ends of the three driver elements 208 of the driver 206 reciprocate in the vertical direction in the figure.

  Accordingly, the three diaphragm portions 217 sequentially reciprocate in the vertical direction as the driver 208 reciprocates in the vertical direction, so that the three pump chambers 235 also expand and contract sequentially. When the diaphragm portion 217 moves downward and the pump chamber 235 expands, the pump chamber 235 is in a negative pressure state, and the mountain valve 260a of the suction / discharge valve body 260 is in contact with the peripheral surface of the suction column 245. Since it is elastically deformed so as to be pulled downward from the state and a gap is formed between the peripheral surface of the suction / discharge column 245 and the mountain valve 260a, the pump is passed from the suction hole 249 of the lid 240 through the suction space 252. Air is sucked into the chamber 235.

  On the other hand, when the diaphragm portion 217 moves upward and the pump chamber 235 contracts, the pressure in the air in the pump chamber 235 increases. Therefore, as shown in FIG. 260 b is elastically deformed so as to be separated from the peripheral surface portion 246 a of the discharge column 246 of the lid 240, and the discharge cylinder portion 243 is discharged from the pump chamber 235 through the discharge hole 233 of the partition plate 230 and the discharge space 241 of the lid 240. Air is exhausted from the outlet 242.

  Here, in a stage before the pump chamber 235 is contracted, the distal end portion 260s of the U-shaped valve 260b is not brought into contact with the tapered portion 246b of the discharge column 246, and is near the boundary with the tapered portion 246b. Since it is only slightly in contact with the peripheral surface portion 246a, the opening / closing resistance of the U-shaped valve 260b with respect to the peripheral surface portion 246a of the discharge column 246 is small, and a smooth pumping operation by a smooth air flow is realized. .

  Further, at this time, the air flows from the pump chamber 235 through the discharge hole 233 of the partition plate 230 through a gap between the distal end portion 260 s of the U-shaped valve 260 b of the suction / discharge valve body 260 and the peripheral surface portion 246 a of the discharge column 246. Since air becomes a straight line along the peripheral surface portion 246a, the vibration of the tip portion 260s of the U-shaped valve 260b can be suppressed as compared with the conventional case, and the generation of noise can be greatly reduced.

  Furthermore, since the U-shaped valve 260 has an R portion 260r formed in a U-shape toward the distal end portion 260s, even when vibration occurs in the distal end portion 260s of the U-shaped valve 260b, Since the vibration is absorbed by the R portion 260r, the generation of noise can be greatly reduced.

<Other embodiments>
In the above-described embodiment, the case where the distal end portion 260s of the U-shaped valve 260b of the suction / discharge valve body 260 is formed so as to face upward has been described. Not limited to this, it may be formed so that the tip end portion 260s of the U-shaped valve 260b is kept facing downward. In this case, when the discharge column 246 is pushed into the distal end portion 260s of the U-shaped valve 260b, the distal end portion 260s is not turned and bent, so that the lid 240 can be easily assembled to the partition plate 230. Become.

  In the above-described embodiment, the case where the mountain-shaped valve 260a is used for air suction of the suction / discharge valve body 260 has been described. However, the present invention is not limited to this, and instead of the mountain-shaped valve 260a. Alternatively, a U-shaped valve 260b may be used.

  Furthermore, in the above-described embodiment, the case where the present invention is applied to the three-cylinder diaphragm pump 1 provided with three pump chambers 35 has been described. However, the present invention is not limited to this, and one cylinder or two cylinders are also provided. However, it may be applied to a diaphragm pump having four or more cylinders.

  DESCRIPTION OF SYMBOLS 200 ... Diaphragm pump, 202 ... Motor, 203 ... Case, 204 ... Crank base, 205 ... Drive shaft, 206 ... Drive body, 207 ... Bearing part, 208 ... Driver, 210 ... Diaphragm holder, 211 ... Diaphragm part holding hole, 215 ... Diaphragm, 217 ... Diaphragm part, 219 ... Piston, 227 ... Flange, 230 ... Partition plate, 232 ... Suction hole, 233 ... Discharge hole, 235 ... Pump chamber, 240 ... Lid, 241 ... Discharge space, 242 ... Discharge Outlet, 243 ... discharge cylinder part, 245 ... suction column, 246 ... discharge column, 247 ... partition, 252 ... suction space, 260 ... suction and discharge valve element (discharge valve element).

Claims (3)

A pump section having a pump chamber;
A partition plate provided above the pump portion and having a discharge hole communicating with the pump chamber;
A discharge valve body provided corresponding to the discharge hole having a U-shaped valve whose front end portion is open and whose cross-sectional shape is U-shaped;
A discharge column provided corresponding to the discharge hole and the U-shaped valve; and a discharge port communicating with the discharge hole; and when the discharge column is inserted into the discharge hole, the U-shaped The tip of the valve is brought into contact with the discharge column to seal the pump chamber, and when the tip of the U-shaped valve is separated from the discharge column, the fluid in the pump chamber is discharged to the discharge port. And a lid exhausted from the
The discharge strut of the lid body has a peripheral surface portion that is linear along the direction of the fluid flowing from the pump chamber, and a tapered portion that has a tapered tip. pump. 2. The pump with an exhaust mechanism according to claim 1, wherein the U-shaped valve functions as a check valve of the pump chamber when the tip end portion comes into contact with the peripheral surface portion of the discharge column. . The pump with an exhaust mechanism according to claim 2, wherein a diameter of the discharge column is larger than a diameter of an opening of the tip portion of the U-shaped valve.

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