CN213016730U

CN213016730U - Pump and method of operating the same

Info

Publication number: CN213016730U
Application number: CN201821810158.5U
Authority: CN
Inventors: 村上拓; 安藤祯晃; 野村昌司
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2017-12-08
Filing date: 2018-11-05
Publication date: 2021-04-20
Anticipated expiration: 2028-11-05
Also published as: JP2019100329A

Abstract

The utility model provides a pump, this pump has: a drive section; a movable part which moves by the driving of the driving part; a pump chamber whose volume is increased or decreased by the movement of the movable portion; a partition wall portion constituting an upper wall of the pump chamber; and a plurality of fluid passing portions provided in the partition wall portion and through which the fluid passes in the vertical direction. Each fluid passage portion includes: a valve seat part having a vent hole penetrating the partition wall part in the vertical direction; and a valve element for opening and closing the vent hole. The plurality of spools have: a first valve core made of a first material; and a second valve element made of a second material different from the first material.

Description

Pump and method of operating the same

Technical Field

The utility model relates to a pump.

Background

Japanese patent application laid-open No. 2000-130343 discloses the following electromagnetic diaphragm pump: the valve material of the suction valve and the discharge valve with excellent durability and ozone resistance is specified, and the long-term stable use can be ensured. In the electromagnetic diaphragm pump disclosed in japanese patent application laid-open No. 2000-130343, the suction valve and the discharge valve fixed to the valve housing main body so as to have a valve function are each formed of a silicone elastomer.

SUMMERY OF THE UTILITY MODEL

The environment of the valve body that opens and closes the vent hole may vary depending on the location in the pump. For example, the valve element may be heated by a different method depending on the location in the pump. In some pumps having a plurality of valve elements, the usage environment may vary between the valve elements. That is, in any of the plurality of valve elements, there is a possibility that the material constituting the valve element is not suitable for the use environment.

The utility model aims at providing a can improve the technique of the durability of pump. Other objects of the present invention are to provide a technique for reducing noise of a pump.

An exemplary pump of the present invention is a fluid pump.

Scheme 1 is a pump having:

a drive section;

a movable portion that moves by the driving of the driving portion;

a pump chamber whose volume is increased or decreased by the movement of the movable portion;

a partition wall portion constituting an upper wall of the pump chamber; and

a plurality of fluid passing portions provided in the partition wall portion and through which a fluid passes in the vertical direction,

each of the fluid passing portions includes:

a valve seat portion having a vent hole penetrating the partition wall portion in the vertical direction; and

a valve element for opening and closing the vent hole,

it is characterized in that the preparation method is characterized in that,

the plurality of valve elements include:

a first valve core made of a first material; and

and a second valve element made of a second material different from the first material.

Scheme 2 is the pump of scheme 1, wherein,

the fluid passage section includes:

a suction-side fluid passage section for sucking fluid into the pump chamber; and

a discharge-side fluid passage section for discharging fluid from the pump chamber,

the suction side fluid passage portion has the first valve body,

the discharge-side fluid passage portion includes the second valve element.

Scheme 3 is the pump according to

scheme

1 or 2, characterized in that,

the second material has a higher heat resistance than the first material.

Scheme 4 is the pump of

scheme

1 or 2, wherein,

the second material is a silicone-based elastic material.

Case 5 is the pump according to case 4, characterized in that,

the first material is ethylene propylene diene monomer.

Case 6 is the pump according to case 4, characterized in that,

the type A durometer hardness of the second material is 45 to 55.

Case 7 is the pump according to case 6, characterized in that,

the type A durometer hardness of the first material is the same as the type A durometer hardness of the second material.

Case 8 is the pump according to case 2, characterized in that,

the valve body has a shaft portion extending in the vertical direction,

at least the discharge-side valve seat portion of the discharge-side fluid passage portion of the suction-side fluid passage portion and the discharge-side fluid passage portion has a first region and a second region in which the plurality of vent holes are distributed,

the first region is located in one of two division regions opposed to each other with the center line as a center among four division regions defined by two planes orthogonal to each other and including the center line of the shaft portion, and the second region is located in the other division region.

Case 9 is the pump according to case 8, characterized in that,

the suction-side valve seat portion of the suction-side fluid passage portion has a plurality of vent holes arranged in a different array from the discharge-side valve seat portion.

Case 10 is the pump according to case 8 or 9, characterized in that,

the suction side valve seat portion has a larger number of the vent holes than the discharge side valve seat portion,

the plurality of vent holes of the suction-side valve seat portion are arranged at equal intervals in the circumferential direction around the center line of the shaft portion.

Scheme 11 is the pump of

scheme

1 or 2, wherein,

the movable portion is a diaphragm that vibrates by the driving of the driving portion.

Scheme 12 is the pump of

scheme

1 or 2, wherein,

the driving unit includes a motor.

The present invention provides a technique for improving the durability of a pump. The present invention provides an example technique that can realize low noise of a pump.

The above and other features, elements, steps, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention when taken in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a perspective view of a pump according to an embodiment of the present invention.

Fig. 2 is a perspective view showing the motor and the crank portion.

Fig. 3 is a perspective view showing a part of the structure shown in fig. 2 in an exploded manner.

Fig. 4 is an exploded perspective view showing a part of the pump shown in fig. 1.

Fig. 5 is a perspective view of the second block viewed from the lower side.

Fig. 6 is a sectional perspective view of a stacked body in which a first block, a second block, and a lid are stacked.

Fig. 7 is a perspective view of the cover viewed from below.

Fig. 8 is a diagram showing the flow of fluid in the lid.

Fig. 9 is a schematic diagram for explaining a configuration example of the valve seat portion.

Fig. 10 is a diagram for explaining a modification of the valve seat portion shown in fig. 9.

Fig. 11 is a diagram for explaining a modification of the valve seat portion shown in fig. 9.

Fig. 12 is a diagram showing an example of the relationship between the fluid passage portion and the first partition wall.

Fig. 13 is a schematic view of the suction-side valve seat portion of the present embodiment.

Fig. 14 is a view showing a part of a horizontal cross section of the lid body.

Fig. 15 is a graph showing the experimental results in the case where the hardness of the second material used for the pump was changed.

Detailed Description

Hereinafter, a pump according to an exemplary embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a perspective view of a pump 1 according to an embodiment of the present invention. The pump 1 is a fluid pump. As shown in fig. 1, the pump 1 includes a drive unit 10, a first block 20, a second block 30, and a cover 40. The drive unit 10 includes a case 11 and a motor 12. The motor 12 is mounted on one side surface of the case 11.

In this specification, a direction in which the case 11, the first block 20, the second block 30, and the cover 40 are stacked is defined as an up-down direction. The first block 20 side is set to be upper with respect to the case 11. The direction in which the output shaft 12a of the motor 12 shown in fig. 3 described later extends is defined as the front-rear direction. The front-back direction is orthogonal to the up-down direction. Of the two surfaces of the case 11 perpendicular to the output shaft 12a, the surface side on which the motor 12 is mounted is the front side. In addition, a direction orthogonal to the up-down direction and the front-rear direction defined above is defined as a left-right direction. As shown in fig. 1, of the suction port 41 and the discharge port 42 arranged in the left-right direction, the discharge port 42 side is set to the right with respect to the suction port 41. The shape and positional relationship of each part will be described in terms of the above definitions of the upper and lower sides, the front and rear sides, and the left and right sides. However, the orientation of the pump of the present invention in use is not intended to be limited by the definition of these directions.

In the pump 1, the tank 11, the first block 20, the second block 30, and the cover 40 are arranged in this order from bottom to top. The case 11, the first block 20, the second block 30, and the case 40 are all rectangular in shape and have substantially the same size in a plan view from above. The case 11, the first block 20, the second block 30, and the case 40 are stacked so that four corners are aligned, and the four corners are fixed and integrated by the first screws 2 extending vertically.

Fig. 2 is a perspective view showing the motor 12 and the crank portion 13. Fig. 2 also shows a movable portion 22 described later. Fig. 3 is a perspective view showing a part of the structure shown in fig. 2 in an exploded manner. The drive unit 10 includes a crank portion 13 in addition to the motor 12. Crank portion 13 is disposed inside case 11. An output shaft 12a of the motor 12 fixed to the front surface of the case 11 leaks into the case 11 and is coupled to the crank portion 13. As shown in fig. 2 and 3, the crank portion 13 includes an eccentric rotating body 131, a connecting rod 132, a balancer 133, and a bearing 134.

The eccentric rotary body 131 has a main body 1311 and a protruding pin 1312. The body 1311 is cylindrical and extends in the front-rear direction. The protruding pin 1312 protrudes rearward from the rear end of the body 1311. The eccentric rotary body 131 has a shaft mounting hole (not shown) extending in the front-rear direction at the front end thereof, into which the output shaft 12a is inserted. The protruding pin 1312 is eccentrically disposed from the shaft mounting hole. That is, the protruding pin 1312 is disposed eccentrically with respect to the output shaft 12 a. The eccentric rotary body 131 is attached to the motor 12 by inserting the output shaft 12a into the shaft attachment hole. The eccentric rotary body 131 rotates together with the output shaft 12 a.

The link 132 includes an annular portion 1321, a connecting portion 1322, and a plate portion 1323. The annular portion 1321 is annular extending in the front-rear direction. The connection portion 1322 extends upward from the annular portion 1321. The plate-shaped portion 1323 is disc-shaped and extends in a direction orthogonal to the vertical direction. The connecting portion 1322 connects the annular portion 1321 and the plate portion 1323. The eccentric rotary body 131 is inserted into the annular portion 1321 via the bearing 134. The inner diameter of the annular portion 1321 is larger than the outer diameter of the body portion 1311. The inner race of the bearing 134 faces the outer peripheral surface of the body 1311. The outer ring of the bearing 134 faces the inner circumferential surface of the annular portion 1321. The protruding pin 1312 protrudes rearward from the annular portion 1321.

The balancer 133 is a cylindrical hammer member. The balancer 133 has a pin attachment hole 1331 penetrating in the front-rear direction. The pin mounting hole 1331 is eccentrically disposed with respect to the central axis of the balancer 133. The balancer 133 is mounted to the eccentric rotary body 131 by inserting the protrusion pin 1312 into the pin mounting hole 1331. The balancer 133 rotates together with the eccentric rotary body 131.

The output shaft 12a is rotated by the driving of the motor 12. The eccentric rotary body 131 and the balancer 133 rotate with the rotation of the output shaft 12 a. As the eccentric rotary body 131 rotates, the connecting rod 132 coupled to the eccentric rotary body 131 via the bearing 134 moves in the vertical direction. That is, the crank portion 13 converts the rotation of the motor 12 into the reciprocating motion in the vertical direction. According to the driving unit 10 using the motor 12 of the present embodiment, a small dry vacuum pump can be configured, for example.

Fig. 4 is an exploded perspective view showing a part of the pump 1 shown in fig. 1. In fig. 4, the first screw 2 is omitted. As shown in fig. 4, the first block 20 includes a first frame portion 21 and a movable portion 22. That is, the pump 1 has a movable portion 22. The first frame portion 21 extends in the vertical direction. The outer peripheral portion of the movable portion 22 is supported by the upper portion of the first housing portion 21.

The movable portion 22 is moved by the driving of the driving portion 10. In the present embodiment, the movable portion 22 is a diaphragm that vibrates by the driving of the driving portion 10. According to the present embodiment, for example, a small-sized dry vacuum pump can be configured. Specifically, the movable portion 22 vibrates up and down in conjunction with the vertical movement of the link 132.

As shown in fig. 3 and 4, in the present embodiment, the movable portion 22 includes a diaphragm portion 221 and a fixed plate 222. The diaphragm portion 221 is a disk-shaped elastic member. The diaphragm portion 221 may be a rubber member such as EPDM (ethylene propylene diene monomer) or silicone rubber. As shown in fig. 3, the diaphragm portion 221 has an annular diaphragm projection 2211 projecting upward on the upper surface. The diaphragm portion 221 has a protrusion attachment hole 2212 penetrating in the vertical direction at the center.

The fixing plate 222 is disposed above the diaphragm portion 221. Specifically, the fixing plate 222 has a disc shape, and is surrounded by the film sheet projection 2211. The fixing plate 222 is made of metal such as aluminum. However, the fixing plate 222 may be made of a material other than metal, such as resin. The fixing plate 222 has a cylindrical projection 2221 projecting downward at the center of the lower surface. The projection 2221 is inserted into the projection mounting hole 2212 of the diaphragm portion 221. The fixing plate 222 has a screw mounting hole 2222 penetrating in the vertical direction including the projection 2221 at the center portion. By inserting the second screw 223 into the screw mounting hole 2222, the diaphragm portion 221 is screw-fixed to the plate portion 1323 of the link 132 together with the fixing plate 222.

Fig. 5 is a perspective view of the second block 30 as viewed from the lower side. As shown in fig. 4 and 5, the second block 30 includes a second frame portion 31 and a disk-shaped partition portion 32 surrounded by the second frame portion 31. That is, the pump 1 has the partition wall portion 32. The second frame portion 31 and the partition wall portion 32 may be a single member, but may be separate members. In the present embodiment, the first frame portion 31 is made of plastic. The partition wall 32 is made of a plastic material, and a rubber material is disposed on the upper surface side. The partition wall 32 is plate-shaped and is positioned on the upper side of the second frame portion 31. Therefore, as shown in fig. 5, the second block 30 has a second block recess 33 recessed toward the upper side on the lower surface side.

In the present embodiment, the partition wall 32 has a partition wall recess 321 recessed upward on the lower surface side. The partition wall recess 321 is formed along the outer edge of the circular partition wall 32 and surrounds the fluid passage 34 described later. Accordingly, when the fixing plate 222 is inclined in the left-right direction or the front-rear direction, the fixing plate 222 can be prevented from contacting the partition wall portion 32.

Fig. 6 is a sectional perspective view of a stacked body 50 in which the first block 20, the second block 30, and the lid 40 are stacked. As shown in fig. 6, the second block 30 is disposed on the first block 20, thereby forming a pump chamber 60 surrounded by the second block recess 33 and the movable portion 22. That is, the pump 1 has the pump chamber 60. The partition wall portion 32 constitutes an upper wall of the pump chamber 60. The volume of the pump chamber 60 increases and decreases by the movement of the movable portion 22. Specifically, the movable portion 22 moves upward, thereby reducing the volume of the pump chamber 60. The movable portion 22 moves downward, thereby increasing the volume of the pump chamber 60.

The partition wall 32 is provided with a plurality of fluid passing portions 34. That is, the pump 1 includes a plurality of fluid passing portions 34 through which fluid passes in the vertical direction. In the present embodiment, the fluid passage portion 34 includes a suction-side fluid passage portion 341 and a discharge-side fluid passage portion 342. The suction-side fluid passage portion 341 sucks fluid into the pump chamber 60. The discharge-side fluid passage portion 342 discharges fluid from the pump chamber 60. The suction-side fluid passage portion 341 is located on the left side and the discharge-side fluid passage portion 342 is located on the right side with respect to the center of the circular partition wall portion 32. When the motor 12 rotates in the opposite direction to the present embodiment, the suction-side fluid passage portion 341 is located on the right side and the discharge-side fluid passage portion 342 is located on the left side with respect to the center of the circular partition portion 32.

In the present embodiment, as shown in fig. 4 and 5, two suction-side fluid passage portions 341 and two discharge-side fluid passage portions 342 are provided. The two suction-side fluid passage portions 341 and the two discharge-side fluid passage portions 342 are arranged in the front-rear direction. However, the number of the suction-side fluid passage portions 341 and the number of the discharge-side fluid passage portions 342 may be one, or three or more. The number of the suction-side fluid passing portions 341 may be different from that of the discharge-side fluid passing portions 342.

Each fluid passage portion 34 has a seat portion 35 and a valve body 36. The valve seat portion 35 has a vent hole 37 penetrating the partition wall portion 32 in the vertical direction. The vent hole 37 has a circular shape, for example. However, the shape of the vent hole 37 is not limited to a circular shape, and may be, for example, an elliptical shape or a polygonal shape. In the present embodiment, each seat portion 35 has a plurality of vent holes 37. However, the number of the vent holes 37 provided in each seat portion 35 may be one. As shown in fig. 6, the valve body 36 has a shaft portion 36a extending in the vertical direction. The valve body 36 further includes an umbrella portion 36b provided at one end of the shaft portion 36 a. The valve body 36 opens and closes the vent hole 37. Specifically, the state in which the air vent holes 37 are blocked by the umbrella parts 36b and the state in which the air vent holes 37 are not blocked by the umbrella parts 36b are switched by the shaft parts 36a moving up and down with respect to the partition wall part 32.

In more detail, the valve seat portion 35 is provided with a shaft attachment hole 35a (see fig. 6) that penetrates the partition wall portion 32 in the vertical direction and into which the shaft portion 36a is inserted. The shaft mounting hole 35a is blocked by the insertion of the shaft portion 36 a.

In the present embodiment, the suction-side fluid passage portion 341 includes a suction-side valve seat portion 351 and a suction-side valve body 361. The discharge-side fluid passage portion 342 has a discharge-side seat portion 352 and a discharge-side spool 362. The suction-side seat portion 351 and the discharge-side seat portion 352 are different in structure from each other. The suction-side spool 361 and the discharge-side spool 362 are identical in shape and size, but are made of different materials. Details thereof will be described later. The suction-side spool 361 and the discharge-side spool 362 may be different in at least one of shape and size from each other.

Fig. 7 is a perspective view of the cover 40 as viewed from below. For example, as shown in fig. 6 and 7, the cover 40 is disposed above the partition wall 32. The lid 40 is a cup-shaped member having a downwardly open side. As shown in fig. 4 and 7, a suction port 41 and a discharge port 42 are provided on the front side surface of the cover 40. That is, the pump 1 has a suction port 41 and a discharge port 42. The suction port 41 communicates with the suction-side fluid passage portion 341 and sucks the fluid. The discharge port 42 communicates with the discharge-side fluid passage portion 342, and discharges the fluid. The suction port 41 and the discharge port 42 are each cylindrical extending in the front-rear direction. When the pump 1 is a vacuum pump, the suction port 41 communicates with a container to be evacuated using, for example, a tube. Gas is sent from the container to the pump chamber 60 via the suction port 41 by driving of the pump 1. The gas is discharged from the pump chamber 60 to the outside through the discharge port 42. The cover 40, the suction port 41, and the discharge port 42 may be a single member configured by resin molding, for example. The suction port 41 and the discharge port 42 may be separate members from the cover 40.

As shown in fig. 7, the cover 40 has a flat plate-like separation wall 43 on the inner side. The partition wall 43 bisects the space inside the lid body 40 in the left and right. That is, the lid body 40 has a suction chamber 44 and a discharge chamber 45 separated from each other in the left-right direction by a separation wall 43. In the present embodiment, the suction chamber 44 is located on the left side of the partition wall 43, and the discharge chamber 45 is located on the right side of the partition wall 43. The suction chamber 44 communicates with the suction port 41. The fluid sucked from the suction port 41 enters the suction chamber 44. The discharge chamber 45 communicates with the discharge port 42. The fluid in the discharge chamber 45 is discharged to the outside of the pump 1 through the discharge port 42.

The cover 40 has a cylindrical first partition wall 46 extending vertically on the inner side. The cover 40 is disposed above the second block 30, and the first partition wall 46 surrounds the fluid passage 34. The lower end portion of the first partition wall 46 is in contact with the upper surface of the partition wall portion 32. In the present embodiment, the suction chamber 44 and the discharge chamber 45 are provided with two cylindrical first partition walls 46, respectively. Hereinafter, the first partition wall 46 on the suction chamber 44 side is referred to as a suction-side first partition wall 461, and the first partition wall 46 on the discharge chamber 45 side is referred to as a discharge-side first partition wall 462. The suction-side first partition wall 461 surrounds the suction-side fluid passage portion 341. The discharge-side first partition 462 surrounds the discharge-side fluid passage portion 342.

In the present embodiment, the number of the first partition walls 46 corresponds to the number of the fluid passage portions 34 on the suction side and the discharge side, and is two. The number of the first partition walls 46 may be changed in accordance with the change in the number of the fluid passage portions 34.

The two suction side first partition walls 461 are aligned in the front-rear direction along the partition wall 43. The two discharge-side first partition walls 462 are aligned in the front-rear direction along the partition wall 43. In the present embodiment, the side surfaces of the suction-side first partition wall 461 and the discharge-side first partition wall 462 are partially connected to the partition wall 43. However, the suction-side first partition wall 461 and the discharge-side first partition wall 462 may not be connected to the partition wall 43. In the present embodiment, the discharge-side first partition wall 462 has a larger diameter than the suction-side first partition wall 461. However, the discharge-side first partition wall 462 and the suction-side first partition wall 461 may have the same diameter, or the discharge-side first partition wall 462 may have a smaller diameter than the suction-side first partition wall 461.

The first partition wall 46 has an opening 46a on a side surface. The opening 46a may be a notch or a through hole. If the opening 46a is cut, the metal mold used for resin molding the lid body 40 can be prevented from becoming complicated. In the present embodiment, the opening 46a is a notch provided at the lower end portion of either the suction-side first partition wall 461 or the discharge-side first partition wall 462. The openings 46a are provided at the same position in the two suction-side first partition walls 461, and are provided at the front lower ends. The positions of the openings 46a provided in the two discharge-side first partition walls 462 are different. The front discharge-side first partition wall 462 has an opening 46a at the front lower end. The rear discharge-side first partition wall 462 has an opening 46a at a position shifted to the right from the front lower end. In the present embodiment, since the two discharge-side first partition walls 462 aligned in the front-rear direction are connected, the position of the opening 46a is shifted between the two discharge-side first partition walls 462.

The position of the opening 46a may be different between the two suction-side first partition walls 461. The positions of the openings 46a in the two discharge-side first partition walls 462 may be the same.

The cover 40 has a second partition wall 47 extending vertically on the inner side and surrounding the first partition wall 46. In the present embodiment, the suction chamber 44 and the discharge chamber 45 are provided with rectangular second partition walls 47 in a plan view from above. One of the left and right end portions of the rear side surface of the second partition wall 47 is open in a top view. Hereinafter, the second partition wall 47 on the suction chamber 44 side is referred to as a suction-side second partition wall 471, and the second partition wall 47 on the discharge chamber 45 side is referred to as a discharge-side second partition wall 472.

The right end of the rear side surface of the suction-side second partition wall 471 is open in a top view. The left end of the rear side surface of discharge-side second partition 472 is open. That is, the end portions of the suction-side second partition wall 471 and the discharge-side second partition wall 472, which are open, are connected to the partition wall 43. In the present embodiment, the suction-side second partition wall 471 and the discharge-side second partition wall 472 are each opened by a notch 47a provided at one location at the rear lower end. Notch 47a is provided in the vicinity of partition wall 43. The suction-side second partition wall 471 surrounds the two suction-side first partition walls 461. A gap is provided between the suction-side second partition wall 471 and the suction-side first partition wall 461. A gap is provided between the suction-side second partition wall 471 and the inner wall of the cover body 40 constituting the suction chamber 44. The discharge side second partition 472 surrounds the two discharge side first partitions 462. A gap is provided between the discharge side second partition wall 472 and the discharge side first partition wall 462. A gap is provided between the discharge-side second partition wall 472 and the inner wall of the lid body 40 constituting the discharge chamber 45.

The intake side first partition wall 461 and the discharge side first partition wall 462 have a circular shape in a plan view from above. The suction-side second partition wall 471 and the discharge-side second partition wall 472 have a rectangular shape in a plan view. Therefore, the cross-sectional area of the gap through which the fluid passes from the suction port 41 to the suction-side first partition wall 461 repeatedly increases and decreases. This causes the fluid to collide with the wall surface, and the impact sound is easily converted into thermal energy by friction. As a result, the impact sound discharged from the discharge port 42 can be reduced, and the noise of the pump 1 can be reduced.

By surrounding the suction-side first partition wall 461 with the suction-side second partition wall 471, the path length of the fluid from the suction port 41 to the suction-side first partition wall 461 can be made longer. By surrounding the discharge side first partition wall 462 with the discharge side second partition wall 472, the path length of the fluid from the discharge side first partition wall 462 to the discharge port 42 can be made longer. This reduces the impact sound discharged from the discharge port 42, thereby reducing the noise of the pump 1.

In the present embodiment, the second partition wall 47 is configured to surround the plurality of first partition walls 46, but the present invention is not limited to this, and the second partition wall 47 may be configured to surround only one first partition wall 46. In this configuration, when there are a plurality of first partition walls 46, the number of second partition walls 47 is also a plurality. The first partition wall 46 may be surrounded by a plurality of partition walls including the second partition wall, for example, two or three layers.

Fig. 8 is a diagram showing the flow of the fluid in the lid 40. The operation of the pump 1 will be described mainly with reference to fig. 6 and 8.

When the motor 12 starts driving, the movable portion 22 starts moving in the vertical direction. When the movable portion 22 descends, the pump chamber 60 expands to become a negative pressure. When the pump chamber 60 becomes a negative pressure, the suction-side valve body 361 is lowered, and the fluid is sucked into the pump chamber 60 from the suction chamber 44 through the vent hole 37 provided in the suction-side valve seat portion 351. Under the negative pressure, the discharge-side valve body 362 maintains a state in which the vent hole 37 provided in the discharge-side valve seat portion 352 is closed.

In the suction chamber 44, fluid is sucked from the suction port 41. The fluid sucked into the suction chamber 44 reaches the cutout portion 47a through a gap between the inner wall of the cover 40 constituting the suction chamber 44 and the suction-side second partition wall 471. The fluid that has reached the cutout 47a passes through the gap between the suction-side second partition wall 471 and the suction-side first partition wall 461, and enters the inside of the suction-side first partition wall 461 through the opening 46 a. The fluid inside the suction-side first partition wall 461 is sucked into the pump chamber 60 through the vent hole 37.

On the other hand, when the movable portion 22 rises, the pump chamber 60 is compressed to become a positive pressure. When the pump chamber 60 becomes a positive pressure, the discharge-side spool 362 rises, and the fluid is discharged from the pump chamber 60 to the discharge chamber 45 via the vent hole 37 provided in the discharge-side seat portion 352. The suction-side valve body 361 is held in a state of closing the vent hole 37 provided in the suction-side valve seat portion 351 under a positive pressure.

The fluid discharged to the inside of the discharge side first partition wall 461 enters the gap between the discharge side first partition wall 462 and the discharge side second partition wall 472 via the opening 46a, and reaches the notch 47a through the gap. The fluid that has reached the cutout portion 47a passes through a gap between the discharge-side second partition 472 and the inner wall of the lid body 40 constituting the discharge chamber 45, and is discharged to the outside via the discharge port 42.

The above-described suction and discharge of the fluid are repeated by the repetition of the vertical movement of the movable portion 22. For example, when the pump 1 is a vacuum pump, gas is sucked into the pump 1 from a container to be vacuumed by the suction operation of the pump 1, and the gas sucked from the container by the pump 1 is discharged to the outside by the discharge operation of the pump 1. This repetition can increase the degree of vacuum of the container to be evacuated.

Fig. 9 is a schematic diagram for explaining a configuration example of the valve seat portion 35. The shaft portion 36a of the spool 36 is also shown in fig. 9. In fig. 9, the valve seat portion 35 has a first region R1 and a second region R2 that distribute the plurality of vent holes 37. The first region R1 is located in one of two divided regions S1 and S3 facing each other about the center line C among four divided regions S1 to S4 defined by two mutually orthogonal planes P1 and P2 including the center line C of the shaft portion 36a, and the second region R2 is located in the other. The two planes P1 and P2 orthogonal to each other are virtual planes and can be set arbitrarily. In the present embodiment, the first region R1 is located in the divided region S1, and the second region R2 is located in the divided region S3. As shown in fig. 6, the center line C of the shaft 36a extends in the vertical direction. In fig. 9, a center line C of the shaft portion 36a extends in a direction orthogonal to the paper surface.

According to the configuration illustrated in fig. 9, the first region R1 and the second region R2 can be arranged so as to be separated by 90 ° or more in the circumferential direction around the center line C of the shaft portion 36 a. That is, according to the configuration illustrated in fig. 9, the vent hole 37 provided in the valve seat portion 35 can be disposed so as to be offset to a part of the circumferential direction around the center line C of the shaft portion 36 a. With this configuration, when the fluid passes through the fluid passage portion 34, only the offset position of the umbrella portion 36b can be easily lifted up with respect to the valve seat portion 35. As a result, when the valve body 36 closes the vent hole 37 after the fluid passes through, the impact at the time of collision of the valve body 36 with the seat portion 35 can be reduced. By this reduction in impact, the impact sound generated by the collision of the valve body 36 with the valve seat portion 35 can be reduced.

Specifically, the first region R1 and the second region R2 face each other in the radial direction around the center line C of the shaft portion 36 a. Thus, the first region R1 and the second region R2 can be separated far apart in the circumferential direction around the center line C of the shaft portion 36 a. Therefore, the umbrella portion 36b can be made less likely to float with respect to the valve seat portion 35 at positions shifted from the first region R1 and the second region R2 in the circumferential direction. That is, the floating range of the umbrella portion 36b can be reduced. As a result, the impact sound generated by the collision of the valve body 36 with the seat portion 35 can be reduced.

The first region R1 and the second region R2 each have one vent hole 37. Accordingly, since the number of the vent holes 37 disposed in each of the regions R1 and R2 is small, the first region R1 and the second region R2 can be easily separated from each other. In addition, the number of vent holes 37 can be reduced, and the generation of impact sound can be suppressed.

Specifically, the centers of the vent holes 37 in the first region R1 and the centers of the vent holes 37 in the second region R2 are arranged on the same circumference around the center line C of the shaft portion 36a, and are separated by 180 ° in the circumferential direction. The vent hole 37 of the first region R1 and the vent hole 37 of the second region R2 are circular shapes having the same diameter in a plan view.

Fig. 10 and 11 are views for explaining modifications of the valve seat portion 35 shown in fig. 9. Fig. 10 and 11 also show the shaft portion 36a of the valve body 36. The number of vent holes 37 allocated to each of the regions R1 and R2 is not limited to one, and may be one or more.

For example, as shown in fig. 10, in the seat portion 35A, the number of the vent holes 37 allocated to the first region R1A and the second region R2A may be plural. In the example shown in fig. 10, two vent holes 37 are respectively allocated to the regions R1A and R2A. The number of the vent holes 37 allocated to each of the regions R1A and R2A may be three or more. The arrangement of the plurality of vent holes 37 arranged in the respective regions R1A and R1B is not particularly limited. The plurality of vent holes 37 may be arranged in a circumferential direction around the center line C of the shaft portion 36a, or may be arranged in a radial direction.

As shown in fig. 11, in the seat portion 35B, the arrangement method of the vent holes 37 may be different between the first region R1B and the second region R2B. Specifically, the number of the vent holes 37 may be different between the first region R1B and the second region R2B. In the example shown in fig. 11, the number of the vent holes 37 in the first region R1B is one, and the number of the vent holes 37 in the second region R2B is two. In the case where the same number of the vent holes 37 are arranged in the first region R1B and the second region R2B, the positions and the arrangement method of the vent holes 37 may be different.

Fig. 12 is a diagram showing an example of the relationship between the fluid passage portion 34 and the first partition wall 46. As shown in fig. 12, the opening 46a is preferably located between the first region R1 and the second region R2 in the circumferential direction around the center line C of the shaft 36 a. This allows the opening 46a to be disposed at a position away from the position where the impact sound is generated by the collision of the valve body 36 with the valve seat portion 35. As a result, the path length of the impact sound to the outside can be increased. In addition, in this structure, since the impact sound passes through the opening 46a which is a narrow space, the impact sound is converted into thermal energy by friction, and the impact sound leaking to the outside can be reduced.

In the example shown in fig. 12, the opening 46a is located at an intermediate portion between the first region R1 and the second region R2 in the circumferential direction around the center line C of the shaft portion 36 a. However, the opening 46a may be located at a position shifted from the intermediate portion toward the first region R1 or the second region R2.

At least the discharge-side valve seat portion 352 of the suction-side fluid passage portion 341 and the discharge-side fluid passage portion 342 of the discharge-side fluid passage portion 342 has a first region R1 and a second region R2 in which the plurality of vent holes 37 are distributed. Thus, a structure for reducing the impact sound generated by the collision of the valve body 36 with the valve seat portion 35 is disposed at least on the downstream side of the flow of the fluid in the pump 1. That is, according to the present configuration, a structure for reducing the impact sound is disposed at least on the side where the impact sound easily leaks to the outside. Therefore, the impact sound suppression effect can be improved as compared with the case where the structure that reduces impact sound is provided only on the suction-side fluid passage portion 341 side.

In the present embodiment, the discharge-side seat portion 352 has a first region R1 and a second region R2. That is, the discharge-side seat portion 352 has the structure shown in fig. 9 described above. The suction-side seat portion 351 does not have the first region R1 and the second region R2. That is, the intake-side seat portion 351 of the intake-side fluid passage portion 341 differs from the discharge-side seat portion 352 in the arrangement of the plurality of vent holes 37. This improves not only the characteristics related to noise but also other characteristics of the pump 1.

The intake-side seat portion 351 may have the first region R1 and the second region R2 in the same manner as the discharge-side seat portion 352. This can increase the effect of suppressing the impact sound generated by the collision of the valve body 36 with the valve seat portion 35.

Fig. 13 is a schematic view of the suction-side seat portion 351 of the present embodiment. Fig. 13 also shows the shaft portion 36a of the spool 36. As shown in fig. 13, the suction-side seat portion 351 differs in the number, diameter, and arrangement of the vent holes 37 from those of the discharge-side seat portion 352. The plurality of vent holes 37 provided in the suction-side seat portion 351 are the same in size and the same in shape. The plurality of vent holes 37 provided in the suction-side seat portion 351 have a circular shape.

Specifically, the suction-side seat portion 351 has more vent holes 37 than the discharge-side seat portion 352. In the present embodiment, the number of the vent holes 37 in the suction-side seat portion 351 is eight. The plurality of vent holes 37 of the suction-side seat portion 351 are arranged at equal intervals in the circumferential direction around the center line C of the shaft portion 36 a. In the present embodiment, the eight vent holes 37 are arranged at 45 ° intervals in the circumferential direction around the center line C of the shaft portion 36 a. The vent hole 37 of the suction-side seat portion 351 has a larger diameter than the vent hole 37 of the discharge-side seat portion 352. The centers of the plurality of vent holes 37 of the suction-side seat portion 351 are arranged on the same circumference about the center line C of the shaft portion 36 a. The diameter of the circumference is larger than the diameter of the circumference of the center of the vent hole 37 in which the discharge-side valve seat portion 352 is disposed. According to the present embodiment, the noise due to the impact sound can be reduced, and the pump efficiency can be improved.

However, the vent hole 37 of the suction-side seat portion 351 and the vent hole 37 of the discharge-side seat portion 352 may have the same size. The diameter of the vent hole 37 of the suction-side seat portion 351 may be smaller than the diameter of the vent hole 37 of the discharge-side seat portion 352. The diameter of the circumference of the plurality of vent holes 37 in which the suction-side seat portion 351 is disposed and the diameter of the circumference of the plurality of vent holes 37 in which the discharge-side seat portion 352 is disposed may be the same, or one of the discharge-side seat portions 352 may be larger.

In the present embodiment, the vent hole 37 is disposed in the first region R1 and the second region R2 in a biased manner in the discharge-side fluid passage portion 342, which is the downstream-side fluid passage portion 34, so that the impact sound generated by the collision of the discharge-side spool 362 with the discharge-side seat portion 352 can be suppressed. Further, the impact sound transmitted to the outside along with the flow of the fluid is easily changed into thermal energy when passing through a narrow space such as the opening portion 46a, the cutout portion 47a, and the discharge port 42. Further, the discharge-side first partition wall 462 and the discharge-side second partition wall 472 increase the length of the path for the fluid passing through the discharge-side fluid passage portion 342 to reach the discharge port 42. Therefore, the impact sound leaking from the discharge port 42 can be reduced.

Fig. 14 is a view showing a part of a horizontal cross section of the lid 40. As shown in fig. 14, the discharge port 42 has a smaller inner diameter than the suction port 41. Specifically, the suction port 41 has a suction-side tube portion 41a extending in the front-rear direction. The suction-side tube portion 41a has a front end portion communicating with the inlet portion 41b of the suction port and a rear end portion communicating with the suction chamber 44. The discharge port 42 has a discharge side tube portion 42a extending in the front-rear direction. The front end of the discharge side tube portion 42a communicates with the outlet portion 42b of the discharge port 42, and the rear end communicates with the discharge chamber 45. The discharge-side tube portion 42a has a smaller inner diameter than the suction-side tube portion 41 a. For example, the discharge-side tube portion 42a has an inner diameter half of the inner diameter of the suction-side tube portion 41 a. Further, in the present embodiment, the diameter of the outlet portion 42b extending in the front-rear direction is also smaller than the diameter of the inlet portion 41 b.

In the present embodiment, the discharge port 42 for discharging the impact sound to the outside has a narrow inner diameter. Therefore, the impact sound is easily converted into thermal energy by friction when passing through the discharge port 42. As a result, the impact sound discharged from the discharge port 42 can be reduced.

As described above, the pump 1 has the plurality of spools 36. The plurality of spools 36 have a first spool 361 and a second spool 362. The first valve body 361 is made of a first material. The second valve core 362 is made of a second material different from the first material. Thus, since the plurality of valve elements 36 include a plurality of types of valve elements having different materials, it is possible to dispose valve elements having materials suitable for each environment. As a result, for example, the durability of the pump 1 can be improved. As a result, for example, noise reduction of the pump 1 can be achieved.

In the present embodiment, the pump 1 includes two types of valve bodies 36 having different materials. However, the pump 1 may have three or more valve bodies 36 of different materials.

Specifically, the suction-side fluid passage portion 341 has a first valve body 361. The discharge-side fluid passage portion 342 has a second spool 362. In other words, the first spool 361 is a suction-side spool. The second spool 362 is a discharge-side spool. Accordingly, the valve body 36 is made of a different material between the suction-side fluid passage portion 341 and the discharge-side fluid passage portion 342, which are likely to cause a difference in the environment of the valve body 36 when the pump 1 is operating. Therefore, the valve body 36 suitable for the suction side and the discharge side can be disposed, and the performance of the pump 1, such as the durability of the pump 1, can be improved.

In this embodiment, the second material has a higher heat resistance than the first material. That is, the second valve body (discharge-side valve body) 362 is made of a material having higher heat resistance than the first valve body (suction-side valve body) 361. Accordingly, the suction-side valve body 361 and the discharge-side valve body 362 can be disposed using appropriate materials according to the difference in the thermal environment to which the valve bodies are exposed. In the pump 1, the exhaust side spool 362 is exposed to a higher temperature environment than the intake side spool 361. Therefore, by using the exhaust side valve body 362 made of a material having higher heat resistance than the intake side valve body 361, deformation of the exhaust side valve body 362 can be suppressed. That is, according to this configuration, the performance including durability of the pump 1 can be improved.

The second material is preferably a silicone-based elastic material. The silicone-based elastic material may be, for example, silicone rubber. This allows the exhaust side valve body 362 to be made of a material having high heat resistance. As a result, deformation of the exhaust side spool 362, which is likely to be exposed to a high temperature environment, can be suppressed, and durability of the pump 1 can be improved.

Further, various silicone rubbers such as methyl silicone rubber, ethylene-methyl silicone rubber, phenyl-methyl silicone rubber, fluorinated silicone rubber, and the like are present among the silicone rubbers, and the type of the silicone rubber constituting the discharge-side spool 362 is not particularly limited. The second material having higher heat resistance than the first material may be a material other than the silicone-based elastic material, and may be, for example, a fluororubber or the like.

The type a durometer hardness of the second material is preferably 45 or more and 55 or less. Specifically, the type a durometer hardness of the silicone elastic material constituting the exhaust side valve body 362 is preferably 45 or more and 55 or less. The type a durometer hardness is a hardness measured in accordance with JISK 6253.

Fig. 15 is a graph showing the experimental results of the case where the hardness of the second material used for the pump 1 is changed. In fig. 15, the horizontal axis represents the type a durometer hardness of the second material, which is the silicone-based elastic material. The vertical axis represents the magnitude of a 1600Hz sound. Specifically, the ordinate represents a relative value in which the magnitude of the obtained sound is represented as 100 when the type a durometer hardness of the second material is 60. Fig. 15 shows the result of changing the type a durometer hardness of the second material from 45 to 60. Particularly, in the case of a sound of 1000 to 5000Hz, a person tends to feel that noise is generated as the sound becomes larger. That is, fig. 15 shows that the smaller the magnitude of the sound, the smaller the noise generated by the pump, and the less likely it is to be harsh.

As shown in fig. 15, when the hardness of the second material is 60, the sound level becomes the highest. Specifically, when the hardness of the second material is 45 or more and 55 or less, the sound level is reduced by 10% or more, as compared with the case where the hardness of the second material is 60. When the hardness of the second material is 50, the sound level becomes the lowest.

As shown in fig. 15, the generation of harsh noise in the pump 1 can be suppressed by setting the type a durometer hardness of the second material to 45 or more and 55 or less. As shown in fig. 15, the type a durometer hardness of the second material is more preferably 50 or near 50 in order to suppress harsh noise.

The first material is preferably Ethylene Propylene Diene Monomer (EPDM). This enables a part of the plurality of valve elements 36 included in the pump 1 to be formed of an inexpensive material. As a result, the manufacturing cost of the pump 1 can be reduced as compared with a case where all the valve elements 36 are made of, for example, a silicone-based elastic material.

The first material having a lower heat resistance than the second material is not limited to EPDM. The first material may be, for example, other synthetic rubber such as nitrile rubber.

In the present embodiment, the type a durometer hardness of the first material is the same as the second material. Thus, the type a durometer hardness of the first material is 45 to 55 inclusive. Therefore, the suction-side valve body 361 can be formed of a material having an appropriate hardness, which is not too hard, and the suction-side valve body 361 can be easily operated by a fluid. Further, the suction-side valve body 361 can be formed of a material having an appropriate hardness without being excessively soft, and the suction-side valve body can be easily formed.

The type a durometer hardness of the first material and the second material may be different. For example, the type a durometer hardness of the first material may be lower than that of the second material. This makes it possible to flexibly configure the suction-side valve body 361, and to facilitate the operation of the valve body 361 by the fluid.

Various technical features disclosed in the present specification can be modified in various ways without departing from the scope of the technical idea. The plurality of embodiments and modifications shown in the present specification can be combined and implemented within a possible range.

In the above-described embodiment, the movable portion 22 vibrates in the vertical direction to vary the volume of the pump chamber 60. For example, the movable portion 22 may vibrate in the front-rear direction and the left-right direction to change the volume of the pump chamber 60. In this case, the configuration of the driving unit 10 needs to be changed according to the configuration of the present embodiment.

In the above-described embodiment, the pump 1 is a diaphragm pump in which the movable portion 22 is formed of a diaphragm. The configuration is not limited to this, and the movable portion 22 may be formed of another member such as a piston.

In the above-described embodiment, the driving unit 10 includes the motor 12 and the crank portion 13. The driving unit is not limited to this configuration, and may be configured to include an electromagnet and a vibrator that vibrates according to a change in polarity of the electromagnet, for example. That is, the present invention can be applied to, for example, an electromagnetic diaphragm pump.

The utility model discloses can utilize in for example diaphragm pump.

Claims

1. A pump, having:

a drive section;

a movable portion that moves by the driving of the driving portion;

a partition wall portion constituting an upper wall of the pump chamber; and

each of the fluid passing portions includes:

a valve element for opening and closing the vent hole,

it is characterized in that the preparation method is characterized in that,

the plurality of valve cores have a first valve core and a second valve core,

the fluid passage section includes:

the suction side fluid passage portion has the first valve body,

the discharge-side fluid passage portion includes the second valve element,

the second valve body has a higher heat resistance than the first valve body.

2. The pump of claim 1,

the second valve body is made of an elastic material of silicone type.

3. The pump of claim 2,

the first valve core is made of ethylene propylene diene monomer.

4. The pump of claim 2,

the second valve body has an A-type durometer hardness of 45 to 55 inclusive.

5. The pump of claim 4,

the type a durometer hardness of the first valve element is the same as that of the second valve element.

6. The pump of claim 1,

the valve body has a shaft portion extending in the vertical direction,

7. The pump of claim 6,

8. The pump according to claim 6 or 7,

9. The pump of claim 1,

10. The pump of claim 1,

the driving unit includes a motor.