JPH0629503Y2 - Diaphragm pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a diaphragm pump having a built-in silencer for silencing the exhaust sound of exhaust gas.

(Prior Art) For example, as described in Japanese Utility Model Laid-Open No. 62-95186, the working fluid supplied to the drive unit body, for example, air, moves the diaphragms provided on the left and right portions of the drive unit body. By the switching valve built in the drive unit body that is operated in conjunction with, the supply and discharge of the left and right working fluid chambers are alternately controlled, and the volume of the pump chamber partitioned and formed outside the respective working fluid chambers through the diaphragm. There is known a diaphragm pump in which the pump action is obtained by changing.

In this diaphragm pump, the air exhausted from the working fluid chamber by the switching valve provided in the drive unit body is sent to the large cavity formed in the dead space inside the drive unit body. At first glance, this cavity looks like it is partitioned into multiple parts, but it is a single space that is only reinforced by multiple ribs, and was attached to the outside of the drive body from this hollow part. Exhaust is performed to the outside through a muffler (silencer).

This muffler is necessary as an accessory to reduce the noise of the air when the diaphragm pump operates, and the larger the pump, the larger the volume of the muffler.

(Problems to be solved by the invention) Since this conventional muffler is attached to the outside of the drive unit body, the total volume of the pump is increased, the installation area of the pump is increased, and further, as an external component. The conventional muffler attached to the drive unit body has a problem that it becomes a protrusion from the drive unit body and is easily damaged by collision with an obstacle.

In addition, if the pump installation area is prioritized, a small muffler with less noise reduction effect will be attached, and this small muffler will be a back pressure against the exhaust of the diaphragm pump, significantly reducing the performance of the pump, while reducing noise. If the effect is prioritized, there is a problem that the installation area of the pump is sacrificed.

The present invention provides a diaphragm pump capable of obtaining a sufficient noise reduction effect from the drive body itself without attaching a muffler to the outside of the drive body and without lowering pump performance.

(Means for Solving Problems) In the diaphragm pump of the present invention, the pump chambers 26 and 27 and the working fluid chambers 24 and 25 are formed by diaphragms 14 and 15 on the left and right inside the pump bodies 16 and 17, respectively. The drive unit bodies 11 and 12 arranged between the working fluid chambers 24 and 25
The center rod 21 is slidably inserted in the center rod 21, and both ends of the center rod 21 are connected to the diaphragms 14 and 15 in the previous period, and the left and right working fluid chambers 24 and 25 are operated by the switching valves provided in the drive unit bodies 11 and 12. In the diaphragm pump in which the supply and exhaust control is alternately performed, the fluctuation of the diaphragms 14 and 15 and the reciprocating movement of the center rod 21 are interlocked with each other.
11 and 12 are divided and configured with a gasket 13 forming a part of the partition walls 105, 111, 134 and 137 interposed therebetween, and one drive unit body 11
This partition wall 10 is formed by partition walls 105 and 111 inside the
A plurality of muffling chambers 103, 107, 112, which are sequentially communicated with each other through ventilation parts 106 provided in 5, 111, and partition walls, which are formed inside the other drive unit body 12, are partitioned by partition walls 134, 137.
A plurality of muffling chambers 133, 136, 139, which are sequentially communicated with each other via ventilation parts 135, 138 provided in 134, 137, are formed, and the muffling chambers 103, 112 formed inside the one drive unit body 11 are formed. And muffling chambers 133 and 139 formed inside the other drive unit body 12.
Are communicated with each other through the ventilation parts 124 and 125 formed in the gasket 13, and the muffling chambers 10 of the two drive part bodies 11 and 12 are communicated with each other.
3, 107, 112, 133, 136, 139 by the working fluid chamber 2
This is a muffler for the gas discharged from 4, 25 to the outside.

(Operation) The diaphragm pump of the present invention operates when the air is supplied to one of the working fluid chambers 24 and 25 by the switching valve.
One of the pump chambers 4 and 15 bulges into one of the pump chambers 26 and 27, and the liquid in the pump chambers is pushed out. The movement of one of the diaphragms 14 and 15 is transmitted to the other diaphragm via the center rod 21, and this diaphragm pushes the air in the other working fluid chamber to the outside. Then, the air exhausted from the working fluid chamber enters the muffling chamber 103 of the one drive unit body 11,
The muffler chamber 107 of the drive body 12 on the other side is entered through the ventilation hole 124 of the gasket 13 through the ventilation part 106 of the partition wall 105 and the ventilation hole 124 of the gasket 13.
From 33 to the muffling chamber 136 via the ventilation part 135 of the partition wall 134, to the muffling chamber 139 via the ventilation part 138 of the partition wall 137, to the muffling chamber 112 of the one drive unit body 11 via the ventilation hole 125 of the gasket 13. Enter the pump exhaust air into multiple muffler chambers 103, 10
Every time it passes 7, 112, 133, 136, 139, the pulsation of the exhaust is sequentially attenuated and finally disappeared.

(Embodiment) Next, a configuration of an embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a cross-sectional view of the diaphragm pump, in which one drive unit body 11 and the other drive unit body 12 are divided and formed with a gasket 13 forming a part of a partition wall interposed therebetween. Pump bodies 16 and 17 are integrally screwed to the outside of 12 via diaphragms 14 and 15, and the drive unit bodies 11 and 12 are arranged in the pump bodies 16 and 17. A lower suction side plate 18 and an upper discharge side plate 19 are integrally provided on the pump bodies 16 and 17, respectively. In addition, the drive unit body 1
1, 12 and pump bodies 16, 17 are molded of synthetic resin.

Also, the diaphragms 14 and 15 on both sides are the drive unit body.
Center rod 21 slidably fitted in the center of 11 and 12
The center rod 21 is held by disk-shaped pressing members 22 and 23 at both ends. Further, the working fluid chambers 24 and 25 formed in the recesses of the drive unit bodies 11 and 12 and the pump chambers 26 and 27 formed in the recesses of the pump bodies 16 and 17 are partitioned by the diaphragms 14 and 15. Has been done.

Further, the suction port 31 provided in the suction side plate 18,
It communicates with the pump chambers 26, 27 through the internal through hole 32 and the suction side check valves 33 provided on the lower left and right portions of the pump bodies 16, 17, and the pump chambers 26, 27 are connected to the pump chambers 26, 27. The discharge side check valves 34 provided on the left and right side of the upper side of 16 and 17 and the discharge ports 36 are communicated with each other through the through holes 35 of the discharge side plate 19.

Then, the working fluid, for example, air is alternately supplied to and discharged from the left and right working fluid chambers 24 and 25 by a switching valve described later,
Diaphragm 1 with the reciprocating movement of the center rod 21
By varying 4 and 15, the volumes of the left and right pump chambers 26 and 27 are alternately expanded and contracted. When the volumes of the pump chambers 26, 27 are expanded, the external liquid is sucked into the pump chamber from the suction port 31 through the lower check valve 33 by the negative pressure generated in the pump chamber, When the volume of 27 contracts, the liquid extruded from this pump chamber is discharged from the discharge port 36 through the check valve 34 on the upper side.

In addition, as shown in FIG. 2, a hole 4 through which the center rod 21 is fully movable so that the center rod 21 can advance and retreat is provided at the center of the drive unit bodies 11 and 12.
1, 42 are molded, and a pair of pilot valves 43, 44 are provided through the holes 41, 42. In each of the pilot valves 43 and 44, an O-ring 45 fitted in a recess is provided with a valve seat by an urging force of a compression coil spring 46.
A diaphragm detector 48, which is pressed by 47 and is integrally formed at the tip in this state, projects into the working fluid chambers 24 and 25, respectively. The spring 46 of the pilot valve 43 on one side is fitted to a sleeve-shaped spring receiving cylinder 49.

Further, as shown in FIG. 3, the drive bodies 11 and 12 have a switching valve mounting hole 51 formed in one drive body 11.
The sleeve 52 is fitted into the mounting hole 51, and the sleeve 52
A spool 53 is slidably fitted in the interior of the. Further, on the outer peripheral surface of the sleeve 52, there are formed five annular concave grooves airtightly isolated by an O-ring, and a large number of vent holes 54, 55, 56, 57, 58 are formed in each concave groove. ing.

Further, in the ventilation holes 54, 55, 56, 57, 58, there are provided an air supply hole 61, an air supply / exhaust hole 62, an exhaust hole 63, an air supply / exhaust hole 64, and an air supply hole 65 formed in the drive unit body 11, respectively. Communicated. Further, the air supply / exhaust hole 64 is opened in the working fluid chamber 24 of the one drive unit body 11, and the air supply / exhaust hole 62 is provided in the gasket 13.
It communicates with the other working fluid chamber 25 through an air supply / exhaust hole 67 formed in 66 and the drive unit body 12.

Further, the spool 53 is switched and operated by a pressure reducing operation method. The operation of the spool 53 will be described.

The O-rings 71 fitted on the leftmost and rightmost sides of the sleeve 52 are partially provided with ventilation grooves, and further, the left and right end faces of the sleeve 52 and the end plates 72 fitted on the end faces are respectively formed. Since a ventilation groove is provided in part between the two, the gas (air) supplied to the air supply holes 61, 65
Enters the both ends of the sleeve 52 through the ventilation groove of the O-ring 71 and the ventilation groove of the end surface of the sleeve, applies pilot operating pressure to the left and right end surfaces of the spool 53, and operates the pilot end on both end surfaces of the spool 53. When one of the operating pressures is released and reduced in pressure, the spool 53 moves to the reduced pressure side. Due to the reduced pressure, the left and right end plates 72
A pilot pressure relief port 73 is provided in each of the left and right sides, and the left and right pressure relief ports 73 communicate with the pilot pressure relief holes 75 via the orifices 74 provided in the drive unit body 11, respectively.
The pilot depressurization holes 75 are communicated with the mounting holes 76 of the pilot valves 43 and 44 shown in FIG. 2, respectively. The mounting holes 76 are interlocked with the movement of the diaphragms 14 and 15 immediately before the end of the exhaust stroke. Valve seats for pilot valves 43 and 44
Working fluid chamber on the exhaust stroke side when one of 47 is opened
It is connected to one of 24 and 25.

Further, as shown in FIG. 3, a detent mechanism is provided on one side of the spool 53. This detent mechanism
A rod 81 is integrally projected from one end surface of the spool 53, and a flange-shaped convex portion 82 is integrally formed on the rod 81. On the other hand, a pair of balls 83 arranged to sandwich the rod 81 and the ball 83 are connected to each other. A detent mechanism main body 85, which is formed by fitting a spring 84 that presses toward the 81 side into a radial hole, is engaged with the end plate 72 on one side. A ventilation groove 86 is provided in the engaging portion. Further, the sleeve 52 and the detent mechanism main body 85 are fixed at positions determined by the screw lid 87.

When the spool 53 is switched, the flange-shaped convex portion 82 passes between the pair of balls 83. Since the peripheral surface of the convex portion 82 is formed into an arc surface, the convex portion 82 is formed.
When the repulsive force of the spring 84 acts on the circular arc surface via the ball 83, the force is diverted from the radial direction to the axial direction on the circular arc surface, forcing the rod 81 to move in the axial direction.
By moving the rod 81 in the axial direction, the spool 53 surely moves to the switching position where it abuts either one of the end plates 72 on both sides, and the spool 53 does not stop at the intermediate position, and the spool 53 moves at the intermediate position. It will not cause pump malfunction due to stoppage.

Next, as shown in FIG. 1, the one drive unit body 11 is provided.
A working fluid supply port 91 is opened on one side, a ventilation hole 93 is communicated with the supply port 91 through a ventilation portion 92, and the air supply hole 61 is communicated with the ventilation hole 93 through a ventilation groove 94. An air chamber 96 communicates with the lower side of the air supply hole 61 through a cutout portion 95. A rib 97 is provided inside the air chamber 96.

Further, an exhaust groove 101 is communicated with the exhaust hole 63, and an upper end opening 102 of the exhaust groove 101 is communicated with a muffling chamber 103.
A rib 104 is provided inside the muffling chamber 103.
A partition wall 105 is provided on the left side of the silencing chamber 103, and the partition wall
The muffling chamber 10 is passed through the ventilation part 106 formed of a concave groove provided in the 105.
7 are connected.

On the right side of the silencing chamber 103, a final silencing chamber 112 is defined by a partition wall 111 which is completely isolated from the silencing chamber 103. A working fluid discharge port 113 that is opened to the outside of the drive unit body 11 is provided above the final muffling chamber 112. Further, assembling bolt insertion holes 114, 115, 116, 117 are provided at four corners of the drive unit body 11.

As shown in FIG. 1, the gasket 13 is provided with a center rod insertion hole 121, an air chamber communication hole 122 is provided below the insertion hole 121 through the hole 66, and an insertion hole is also provided. A pilot valve mounting hole 123 is provided on the left side of 121, and ventilation holes 124 and 125 are provided on both left and right sides of the gasket 13 as ventilation parts of partition walls. This left pilot valve mounting hole 123, ventilation hole 124
Is formed right next to the insertion hole 121 and has a ventilation hole 125 on the right side.
It is drilled slightly below. In addition, this gasket
Assembly bolt insertion holes 126, 127, 128, 129 are provided at four corners of 13 so as to face the bolt insertion holes 114, 115, 116, 117.

Further, as shown in FIG. 1, the other drive unit body 12 is also provided.
The air chamber 131 is provided in the air chamber 131.
Is communicated with the air chamber 96 of the drive unit body 11 through the communication hole 122 of the gasket 13. These air chambers 96 and 131 have a pressure accumulating function because the working fluid air is a compressible fluid, and stably supply air under pressure to the air supply holes 61 and 65. Also, the center rod fitting hole
A pilot valve fitting hole 132 is provided in the vicinity of 42, and an opening peripheral edge of the fitting hole 132 serves as a valve seat 47 of the pilot valve 44.

In addition, a muffling chamber 133 is provided on the left side of the other drive unit body 12.
Is provided, a partition 134 is provided on the right side of the muffling chamber 133, and a ventilation part 135 formed by a concave groove is provided in the partition 134, and the muffling chamber adjacent to the muffling chamber 133 via the ventilation part 135. 136 is communicated, a partition 137 is further provided on the right side of the muffling chamber 136, and a vent 138 formed by a groove is provided in the partition 137. The muffling chamber 13 is passed through the vent 138.
The sound deadening chamber 139 adjacent to 6 is connected. The assembly bolt insertion holes 141, 142, 143, 144 are also provided at the four corners of the other drive unit body 12 at the assembly bolt insertion holes 126, 12 respectively.
It is provided facing 7, 128, 129.

Furthermore, the final muffling chamber 112 of the one drive unit body 11
Is filled with a sound absorbing material 151 such as a porous block or a fibrous foam, and a lattice plate 152 made of synthetic resin is interposed between the sound absorbing material 151 and the working fluid discharge port 113. .

Next, the operation of this embodiment will be described along the flow path of air as a working fluid.

The air pressurized and supplied from the external compressor or the like to the working fluid supply port 91 is constantly supplied to the air supply hole 61 via the air vent 92, the air vent 93, and the air vent groove 94, and also to the air supply hole via the air chamber 96. It is always supplied to 65.

In the spool switching state of the switching valve shown in FIG.
The air supplied to the air is closed by the spool 53, and the air supplied to the air supply hole 65 is supplied to the left working fluid chamber 24 shown in FIG. By supplying air to this working fluid chamber 24,
The diaphragm 14 on the left side bulges into the pump chamber 26 and pushes out the liquid in the pump chamber 26. The movement of the diaphragm 14 is transmitted to the right diaphragm 15 via the center rod 21, and the diaphragm 15 pushes the air in the right working fluid chamber 25 to the outside.

The air in the working fluid chamber 25 is supplied to the air supply / exhaust hole 6 shown in FIG.
7, through the hole 66, the air supply / exhaust hole 62 into the inside of the sleeve 52,
Further, it is extruded into the exhaust hole 63, passes through the exhaust groove 63 of the one drive unit body 11 shown in FIG.
03, and further through the ventilation part 106 of the partition wall 105, the muffling room 10
7, further through the ventilation hole 124 of the gasket 13, into the muffling chamber 133 of the other drive unit body 12, and further through the partition wall 134.
Through the ventilation part 135 of the
Into the muffling chamber 139 through the ventilation part 138 of the gasket 13 and through the ventilation hole 125 of the gasket 13 into the muffling chamber 112 of the one drive unit body 11, and the sound absorbing material 151 and the lattice plate 152 inside the muffling chamber 112.
Through the working fluid discharge port 113 of the drive unit body 11 to the outside.

In this way, the pulsation of the exhaust gas is gradually attenuated by passing the exhaust gas of the aird pump to each of the muffling chambers 103, 107, 133, 136, 139, 112 in order, and finally, the air having a weak pressure is exhausted. The exhaust sound is extinguished by the sound absorbing material 151.

Next, switching of the spool 53 of the switching valve will be described. As described above, the air entering the both ends of the sleeve 52 from the air supply holes 61 and 65 through the ventilation groove of the O-ring 71 fitted to the peripheral surface of the both ends of the sleeve 52 and the ventilation groove of the sleeve end surface. Applies pilot operating pressure to the left and right ends of the spool 53. Then, just before the end of the stroke in which the center rod 21 moves to the left as described above, the pinching member 22 of the right diaphragm 15 presses the detector 48 of the pilot valve 44,
Since the valve seat 47 is opened, the air pressure applied to the left end surface of the spool 53 is applied to the pilot pressure relief port 73, the ventilation groove 86, the orifice 74, the pilot pressure relief hole 75, and the left pilot valve 44 opened. After passing through the valve seat 47 of the above, it escapes to the working fluid chamber 25 in the exhaust stroke.
Due to the pressure reduction on the left end surface of the spool, the spool 53 is switched to the left side by the pilot pressure applied to the right end surface. At this time, the spool 53 is surely switched to the state of contacting the left end plate 72 by the detent mechanism including the convex portion 82, the ball 83 and the like.

When the spool 53 is switched in this way, the air supplied to the air supply hole 61 is supplied to the working fluid chamber 25 on the right side in FIG. 4 through the inside of the sleeve 52 and the air supply / exhaust hole 62.
The air in the working fluid chamber 24 on the left side is sent from the air supply / exhaust hole 64 to the exhaust hole 63 through the inside of the sleeve 52, and is exhausted to the outside via the exhaust path including the above-described sound deadening chambers 103. At this time, the center rod 21 is moved to the right, the liquid is extruded from the right pump chamber 27, and the liquid is sucked into the left pump chamber 26. Immediately before the end of this stroke, the pilot valve 43 is actuated by the pinching member 22 of the left diaphragm 14, the pilot pressure applied to the right end surface of the spool 53 is reduced in the same manner as above, and the spool 53 moves to the third position.
The state is switched to the state shown in the figure.

In this way, the movements of the diaphragms 14 and 15 and the movement of the spool 53 are mutually related, and the suction stroke and the discharge stroke are continuously repeated in the pump chambers 26 and 27 on both sides.

(Effects of the Invention) According to the present invention, a plurality of muffling chambers are formed by partition walls, gaskets, and partition walls inside each of the divided drive unit bodies, and a dead space is used in each drive unit body. A large number of muffling chambers can be formed, and these muffling chambers are sequentially connected through the partition and the ventilation part provided in the gasket, and the plurality of communicating muffling chambers muffle the gas exhausted from the drive unit body to the outside. The pulsation of the exhaust is gradually attenuated by passing through each muffling chamber, the exhaust noise of the air is silenced, and the pump performance is reduced without attaching a muffler outside the drive unit body. Without, a sufficient silencing effect can be obtained from the drive body itself. In addition, since an external muffler is not required, the installation area of the pump is extremely small, and the effective use of the internal space reduces the overall volume of the pump, so that it can be used for other machines as compared to conventional machines. Easy to install. Since there is no external muffler as a protrusion, there is no risk of damage due to external force.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a drive unit body of a diaphragm pump showing an embodiment of the present invention, FIG. 2 is a sectional view of the pilot valve portion of the same as above, and FIG. 3 is a sectional view of the switching valve spool at the level thereof. FIG. 4 is a sectional view of the diaphragm pump. 11,12 …… Drive unit body, 13 …… Gasket, 14,15…
… Diaphragm, 16,17 …… Drive unit body, 21 …… Center rod, 24,25 …… Working fluid chamber, 26,27 …… Pump chamber, 103,107,112,133,136,139 …… Silence chamber , 105, 1
34, 137 ... Partition, 106, 124, 125, 135, 138 ... Ventilation part.

Claims (2)

[Scope of utility model registration request] 1. Pump chambers on the left and right inside the pump bodies 16, 17.
26, 27 and working fluid chambers 24, 25 are diaphragm 1
Partitions are formed at 4 and 15 respectively, and both working fluid chambers 2
The center rod 21 is slidably inserted into the drive unit bodies 11 and 12 arranged between 4 and 25, and both ends of the center rod 21 are connected to the diaphragms 14 and 15 to form the drive unit body.
The left and right working fluid chambers 2 by the switching valves provided in 11 and 12
Supply and exhaust control to 4 and 25 alternately, and the diaphragm 14 and 15
In the diaphragm pump in which the reciprocating movement of the center rod 21 is interlocked with each other, the drive unit bodies 11 and 12 are divided and configured by sandwiching a gasket 13 forming a part of the partition walls 105, 111, 134 and 137. A plurality of muffling chambers 103, 107, 112, which are partitioned and formed inside the drive unit body 11 by partition walls 105, 111 and are sequentially communicated with each other via a ventilation part 106 provided in the partition walls 105, 111, and the other drive unit body 12. A plurality of muffling chambers 133, 136, 139 formed inside and partitioned by partition walls 134, 137 and sequentially connected via ventilation parts 135, 138 provided in the partition walls 134, 137 are formed, and the one drive The muffling chambers 103 and 112 formed inside the part body 11 and the muffling chambers 133 and 139 formed inside the other drive part body 12 are communicated with each other through the ventilation parts 124 and 125 formed in the gasket 13. , Both drive body 11,
A diaphragm pump characterized in that a silencer for gas discharged from the working fluid chambers 24, 25 to the outside is formed by each of the 12 silencer chambers 103, 107, 112, 133, 136, 139. 2. A diaphragm pump according to claim 1, characterized in that the ventilation part of the partition wall is provided to give resistance to the exhausted gas.