JP3990659B2 - Small pump - Google Patents

Description

  The present invention relates to a pump structure, and particularly to a small pump suitably used for a blood pressure monitor or the like.

Several pumps are described in JP open 2003-56465 Patent and, authorized prior art such as Patent Document 1 to Kakizawa. These two documents are a cover member, a common valve chamber, a plurality of pump chambers that are arranged around the common valve chamber and each have a diaphragm, and are provided in an inclined state so as to move up and down the diaphragm. A diaphragm pump having a driving member that extends and a tubular support member that extends obliquely downward from a central portion of the driving member is described.

U.S. Pat. No. 4,801,249

Diaphragm pump described in the above Japanese Open 2003-56465 and No. Patent Document 1, has the high pump efficiency compared to its prior art, there technical room for improvement yet. For example, the pumps described in the prior art cannot completely avoid backflow of air because the air coming from the pump chamber is introduced directly into the common valve chamber. Furthermore, since the valve used in the above Japanese Patent Application No. 2003-56465 and Patent Document 1 is made of an elastic material, it is difficult to incorporate these valves into a cover member made of a strong material. In addition, the pump has the disadvantages of noise and instability. The present invention is thus provided to confront these deficiencies in the prior art.

  Accordingly, an object of the present invention is to have a motor assembly, a pump assembly including a plurality of pump chambers, and a valve assembly, and the valve assembly further includes a plurality of inlet valves and a plurality of outlet valves. And providing a small pump in which each pump chamber corresponds to at least one inlet valve and at least one outlet valve.

  In one embodiment of the present invention, the valve assembly includes a valve member that can be made from plastic to position the inlet and outlet valves. In the present invention, each inlet valve and outlet valve includes a valve element and a plurality of elastic bodies such as soft rubber, soft plastic and the like attached to the inlet valve and outlet valve attached to the valve element. You can have Elastic so that when the inlet valve is opened to allow air to flow into the pump chamber, the outlet valve is closed and when the outlet valve is opened to discharge air, the inlet valve is closed. The body is placed.

In another embodiment of the present invention, the valve assembly has a common outlet in communication with the outlet valve. The common outlet valve can have a plurality of valve flaps made of an elastic material extending axially from the valve member and a plurality of valve ribs each connected to the valve flap.

  According to the present invention, the cover member forms a plurality of air passages, each air passage communicates with the outlet valve and the common outlet valve, and the valve flap corresponds to one air passage. In this case, when one valve flap is opened and air is exhausted from one air passage, the other flap valves are closed to block their corresponding air passages.

According to another embodiment of the present invention, the pump assembly includes a chamber member having a position limiting rod extending downward from the center thereof, a drive shaft connected to the motor assembly, and a portion extending in the axial direction from the drive shaft. And a drive member having a recess for receiving the position limiting rod.

The drive shaft in the present invention may have a groove extending in the axial direction from the bottom of the recess to accommodate the lubricant.

In another embodiment of the invention, the motor assembly includes a plurality of assembly members to engage the pump assembly and the valve assembly. The assembly member extends in an axial direction so as to engage with recesses respectively provided by the pump assembly and the valve assembly, and the assembly member engages with an assembly slot provided at the top of the valve assembly. Assembly fasteners at the top of the.

  Compared with the prior art, the small pump of the present invention has 1) high pump efficiency by two check outlet valves, 2) easy assembly and small structure by valve member and assembly member, and 3) depression of drive shaft. It has advantages such as high stability and low noise due to the mating with the position limiting rod.

  The small pump of the present invention includes a motor assembly, a pump assembly including a plurality of pump chambers, and a valve assembly. The valve assembly further includes a plurality of inlet valves and a plurality of outlet valves. Each pump chamber corresponds to at least one inlet valve and at least one outlet valve.

  The present invention will be described in detail with reference to the accompanying drawings.

  Referring to FIGS. 1 and 2, the embodiment of the small pump of the present invention includes a valve assembly 100, a pump assembly 200, and a motor assembly 300.

  Further, referring to FIG. 3, the motor assembly 300 includes a motor 330 and a connection casing 320 fixed to the motor 330 by a screw 340 through a hole 333. The gasket 341 is provided between the screw 340 and the bottom of the connection casing 320. A socket 334 for transmitting power is provided at the bottom of the motor 330. The connection casing 320 has an eccentric member 310 connected to the motor shaft 332. The eccentric member 310 has an inclined hole 312 extending obliquely downward from its top. Three assembly members 321 described later are provided on the side of the connection casing 320 and extend upward.

  Referring now to FIGS. 1 to 4, the pump assembly 200 includes a chamber member 210, a chamber casing 220, and a drive member 230. The drive member 230 has a drive shaft 232 provided at the center thereof, and the drive shaft 232 is inserted into the inclined hole 312 of the eccentric member 310. The chamber member 210 can have a plurality of pump chambers 211. In this embodiment, three pump chambers 211 are provided. The connection neck 213 is formed by extending the bottom of the pump chamber 211 downward. The chamber member 210 is attached to the chamber casing 220. The pump chamber 211 is inserted through the corresponding through hole 221 in the chamber casing 220. The three holes 231 in the drive member 230 receive the connection neck 213 as shown in FIG. The drive member 230 has a recess 2331 at the top of a portion 233 extending in the axial direction upward from the drive shaft 232, and the recess 2331 receives a position limiting body 223 extending downward from the center of the chamber casing 220. The position restricting body 223 preferably has a rounded head 2231 so that friction generated between the position restricting body 223 and the recess 2331 is reduced. Further, the drive shaft 232 is provided with a groove 234 extending downward from the recess 2331 in order to accommodate the lubricant so as to reduce friction and noise.

  Referring to FIGS. 2, 5, 6 a, and 6 b, the valve assembly 100 includes a cover member 120, a valve member 130, and a cover plate 140. The cover plate 140 covers the chamber member 210 and has a plurality of inlet passages 142 and a plurality of outlet passages 143. At least one inlet passage 142 and at least one outlet passage 143 are disposed on each pump chamber 211 (211 '). The valve member 130 is provided with a plurality of inlet valves 131 and outlet valves 132 corresponding to the inlet passage 142 and the outlet passage 143, respectively.

  The cover member 120 is provided with a plurality of inlets 122 that respectively communicate with the inlet passage 142 via the inlet valve 131. Both the inlet valve 131 and the outlet valve 132 can have a valve element and a plurality of elastic bodies attached to the valve element. In the embodiment shown in FIGS. 5, 6 a, and 6 d, each of the inlet valve 131 and the outlet valve 132 includes a valve plate 136 and two elastic bodies 1360. As shown in FIGS. 5 and 6d, the two elastic bodies 1360 are provided behind the valve plate 136 of the inlet valve 131 and the outlet valve 132, whereby the inlet valve 131 and the outlet valve 132 are Closed in common state. The elastic body 1360 can be formed integrally with the valve plate 136. Further, the cover member 120 is provided with a plurality of air passages 124 communicating with the outlet passage 143 through the outlet valve 132 and a common outlet valve 134. The cover member 120 has a tubular wall 1212 extending upward from the center and a ventilation passage 1211. The common outlet valve 134 has a plurality of valve flaps 1341, 1342, and 1343 that extend upward from the center of the valve member 130 to the bottom of the ventilation passage 1211. In a common state, each valve flap 1341, 1342, 1343 corresponds to the air passage 124. Further, the valve member 130 is provided with a plurality of seal rings 135, which are arranged around the inlet valve 131 and the outlet valve 132, respectively, so that the inlet valve 131 and the outlet valve 132 communicate with each other. It is preventing.

  Returning to FIGS. 1 and 3, the connection casing 320 is provided with a plurality of assembly members 321 extending upward along the side thereof. In this embodiment, the assembly member 321 is inserted into grooves 222, 214, 141, 133 provided correspondingly by the chamber casing 220, the chamber member 210, the cover plate 140, the valve member 130, and the cover member 120. An assembly 3211 is provided. A fastener 3210 is formed on the top of the assembly 3211 and engages the slot 1231 of the cover member 120.

  With such a configuration, the motor assembly 300, the pump assembly 200, and the valve assembly 100 cooperate with each other.

Action of a miniature pump of the present invention is the same as the action described in the JP-open No. 2003-56465 and Patent Document 1, here referred to as reference.

  The following description focuses on describing the operation of the miniature pump in relation to the features of the present invention.

  In the common state, since the inlet 122 is sealed by the valve plate 136, all the inlet valves 131 and the outlet valves 132 are closed by the elastic body 1360. When the motor assembly 300 is energized, the eccentric member 310 connected to the motor shaft 332 is driven to rotate. The drive member 230 is driven by the drive shaft 232 to swing in the circumferential direction. This drives one pump chamber 211 'of the chamber member 210 to be pressed, while another pump chamber 211 is enlarged as shown in FIGS.

  When the pump chamber 211 ′ is pressed, the pressure in the pump chamber 211 ′ is higher than the pressure outside the pump chamber 211 ′, and the inlet valve 131 corresponding to the pump chamber 211 ′ is based on the effect of the elastic body 1360. The outlet valve 132 corresponding to this pump chamber 211 'is open. The air in the pump chamber 211 ′ is discharged from the pump chamber 211 ′ via the outlet passage 143 and enters the air passage 124 communicating with the outlet valve 132. Due to the pressure, the air coming from the air passages 124 pushes the valve flaps corresponding to the air passages 124 into the ventilation passages 1211, while the other valve flaps at the common outlet block their corresponding air passages. Thus, air should be prevented from entering these air passages. A valve rib 1340 is provided on each valve flap 1341-1343 and can be made integrally with the valve flaps 1341-1343, as shown in FIG. 6c to close the common outlet valve 134 in a common state. In position, ensure that the valve flaps 1341-1343 can be restored.

  When the pressure in the valve chamber, that is, the pump chamber 211 is lower than the pressure outside the pump chamber 211, the outlet valve 132 corresponding to the pump chamber 211 is closed by the elastic body 1360, while corresponding to this pump chamber. The inlet valve 131 is opened. Air outside the pump chamber 211 is sucked into the pump chamber 211 via the inlet 122 and the inlet valve 131.

  The small pump of the present invention is provided with a valve member 130 so as to assemble the inlet valve 131 and the outlet valve 132, and also constitutes two check valves having the outlet valve 132 and the common outlet valve 134. This can sufficiently increase pump efficiency because such a structure can effectively prevent backflow of air.

  As described above, in the present invention, the position limiter 223 is provided with the head portion 2231 that is rounded so as to match the depression 2331 portion that performs the stable operation of the small pump of the present invention. The lubricant contained in the groove 234 can reduce the friction between the position limiter 223 and the drive shaft 232, thereby reducing noise when the pump is operated.

  The design of the assembly member 321 of the present invention facilitates pump assembly.

  It is understood that modifications and variations in the present invention are encompassed within the scope of the present invention without departing from the spirit of the present invention, as will be apparent to those skilled in the art, such that a common outlet valve is formed in the cover member. Is done.

  The invention is defined by the appended claims.

  The small pump of the present invention can be suitably used for a blood pressure monitor or the like.

1 is an exploded view of one embodiment of a miniature pump according to the present invention. FIG. FIG. 2 is a longitudinal sectional view of the embodiment as shown in FIG. 1. FIG. 2 is a longitudinal sectional view of the motor assembly of the embodiment as shown in FIG. 1. FIG. 2 is a longitudinal sectional view of the pump assembly of the embodiment as shown in FIG. 1. FIG. 2 is a longitudinal sectional view of the valve assembly of the embodiment as shown in FIG. 1. It is a rear view of the valve member of the valve assembly of the Example as shown in FIG. It is a front view of the valve member of the valve assembly of the Example as shown in FIG. It is the elements on larger scale of the common outlet valve of the valve assembly of the Example as shown in FIG. It is a perspective view of the valve member of the valve assembly of the Example as shown in FIG. It is an enlarged view of the valve element of the inlet valve or the outlet valve of the valve member of the valve assembly of the embodiment as shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Valve assembly 120 Cover member 1211 Ventilation passage 122 Inlet 123 Groove 1231 Slot 124 Air passage 130 Valve member 131 Inlet valve 132 Outlet valve 134 Common outlet valve 1340 Valve rib 135 Seal ring 136 Valve plate 1360 Elastic body 140 Cover plate 141 Groove 142 Inlet passage 143 Outlet passage 200 Pump assembly 210 Chamber member 211 Pump chamber 213 Connection neck 214 Groove 220 Chamber casing 222 Groove 223 Position limiter 2231 Head 230 Drive member 232 Drive shaft 233 Partial 2331 Depression 234 Groove 300 Motor assembly 310 Eccentric member 312 Inclined hole 320 Connection casing 321 Assembly member 3210 Fastener 3211 Assembly 330 Motor 332 Motor shaft 333 Hole 334 Socket 340 Screw 341 Gasket G

Claims (10)

The motor assembly (300) includes a pump assembly (200) including a plurality of pump chambers (211), and a valve assembly (100). The valve assembly (100) includes a plurality of inlet valves ( 131) and a plurality of outlet valves (132), each pump chamber corresponding to at least one inlet valve and at least one outlet valve,
The valve assembly includes a valve member (130) for disposing the inlet valve and the outlet valve, and a common outlet valve (134) communicating with the outlet valve,
It said common outlet valve (134) is a small pump and having a plurality of valve flaps extending in the axial direction from the center of the valve member made of an elastic material (130). Each inlet valve and outlet valve comprises a valve element (136), a small pump according to claim 1, characterized in that it has a plurality of elastic body attached to the valve element (1360). The elastic body so that when the inlet valve is opened to allow air to flow into the pump chamber, the outlet valve is closed and when the outlet valve is opened to discharge air, the inlet valve is closed. The small pump according to claim 2, wherein:   The small pump according to claim 1, wherein the common outlet valve has a plurality of valve ribs (1340) each connected to a valve flap. The valve assembly is according to claim 1 or 4 small pump, wherein the each having a plurality of air passages (124) communicating with the outlet valve and the common outlet valve. Each valve flap corresponds to one air passage, and when one valve flap is opened and air is exhausted from one air passage, the other valve flaps of the valve member are closed and their corresponding 6. The small pump according to claim 5 , wherein the small pump is performed so as to block the air passage. Pump assembly, the axis the chamber casing (220) having a position limiting member (223) extending from the center in the axial direction, from the connected drive shaft to the motor assembly (300) (232) and drive shaft (232) to any one of claims 1 to 6; and a driving member recess to receive position limits body portion (233) extending in the direction (223) (2331) was formed (230) Small pump as described. 8. A miniature pump as claimed in claim 7 , characterized in that the drive shaft has a groove (234) extending axially from the bottom of the recess for receiving the lubricant. The small pump according to any one of claims 1 to 8 , wherein the motor assembly includes a plurality of assembly members (321) so as to be engaged with the pump assembly and the valve assembly. The assembly member (321) includes an assembly (3211) extending in an axial direction so as to engage with recesses respectively provided by the pump assembly (200) and the valve assembly (100), and the valve assembly (100). 10. A miniature pump according to claim 9 , comprising an assembly fastener (3212) at the top of the assembly to engage an assembly slot (1231) provided at the top.

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