JPH0729259Y2 - Pump with pulsation attenuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a diaphragm pump for pressurizing and discharging a fluid.

[Prior Art] In a diaphragm pump that pumps fluid such as oil,
The secondary pressure fluctuates when the pump switches back and forth, and the pressure oscillates when the secondary pressure is viewed on the time axis. Therefore, in order to damp such vibration of secondary pressure, that is, pulsation, a pulsation attenuator is generally connected to the secondary side of the diaphragm pump.

As such a pulsation attenuator, there is known one in which the main fluid and the air are opposed to each other via a diaphragm, and the pulsation of the main fluid is absorbed and attenuated by the compressibility of the air. When connecting to the secondary side of the diaphragm pump, conventionally, they were connected by an external pipe for supplying the main fluid from the diaphragm pump to the pulsation attenuator, and air was also supplied from the pump by the external pipe. .

However, the method of connecting the diaphragm pump and the pulsation attenuator by external piping in this way requires a large number of piping materials and piping man-hours, and not only is the connection work cumbersome, but the diaphragm pump and the pulsation attenuator are Since they are connected in a state of being separated from each other, there is a drawback that they occupy a large space, a large dead space, etc., and require a large installation space.

[Problems to be Solved by the Invention] An object of the present invention is to configure a diaphragm pump and a pulsation attenuator so that they can be easily and compactly connected with a small number of piping materials and man-hours.

[Means for Solving the Problems] In order to solve the above problems, a pulsation damper-equipped pump of the present invention includes a pair of diaphragms that partition a drive chamber and a pump chamber inside a rectangular plate-shaped body. Then, a diaphragm pump that alternately pressurizes and discharges the main fluid in the two pump chambers by alternately supplying and discharging air to and from the two drive chambers partitioned by these diaphragms to reciprocally drive both diaphragms, By incorporating a pressure-sensitive operating member composed of a piston or a diaphragm inside a rectangular plate-shaped body, and by opposing the main fluid discharged from the diaphragm pump and air via the pressure-sensitive operating member, A pulsation attenuator, which damps the pulsation of the main fluid by the compressibility of the air, is joined by bolts by joining the side faces of each body. The diaphragm pump and the pulsation attenuator have two sets of connection ports through which the main fluid and air flow at corresponding positions on their joint surfaces, and one set of connection ports protrudes from the joint surface and has an outer periphery. A convex port having an O-ring on the bottom and a concave port to which the convex port fits in a fluid-tight manner, and another set of connection ports has a large-diameter flat surface provided with an O-ring. It is characterized by being configured by combining a port and a flat port having a diameter smaller than the inner diameter of the O-ring.

[Operation] In the pump with pulsation attenuator having the above configuration, since the diaphragm pump and the pulsation attenuator are directly connected by bolts, the number of piping materials and piping man-hours for connection are reduced, and the connection work is simplified. Moreover, since the whole is made extremely thin and the occupied space is small, it is possible to install the device in a narrow space.

In addition, one set of connection ports is a combination of a convex port and a concave port, and the other set of connection ports is O
By combining a large-diameter plane port equipped with a ring and a small-diameter plane port smaller than the inner diameter of the O-ring, the ports to be connected to each other depending on the connection state of the diaphragm pump and the pulsation attenuator (axial direction). ) Or a slight left / right displacement, the front / rear displacement is absorbed by the convex and concave ports, and the left / right displacement is absorbed by the large and small flat ports, ensuring port connection. .

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3, 1 is a diaphragm pump for pressurizing and discharging a main fluid such as oil, and 2 is a pulsation attenuator for damping the pulsation of the main fluid discharged from the diaphragm pump 1. The diaphragm pump 1 and the pulsation damper 2 are integrally connected by a bolt 3.

As is clear from FIGS. 4 to 6, the diaphragm pump 1 includes a square plate-shaped body 5 which is substantially square in side view and whose axial length is smaller than the length of one side of the square. Inside the body 5, a pair of diaphragms 6a, 6b, a switching valve 7 for supplying and discharging air, two pilot valves 8a, 8b for switching the switching valve 7,
Four check valves 10a, 10 for selectively supplying and discharging the main fluid
b, 11a, 11b and silencer for reducing exhaust noise 1
Two built-in each.

The configuration of the diaphragm pump 1 will be described in more detail. A center block 15 and side covers detachably attached to both sides of the center block 15 are provided in the center of the inside of the body 5.
In the two spaces between 16a and 16b, the drive chamber 17 is provided.
The diaphragm that divides a and 17b from pump chambers 18a and 18b
6a, 6b are disposed, and these diaphragms 6a, 6b fluidly penetrate the center block 15 and are slidable shafts.
They are connected to each other by 19 and move together.

Inside the valve body 21 and the valve covers 22a, 22b attached to one corner of the body 5, the two drive chambers 17a, 1
The switching valve 7 for alternately connecting the 7b to the supply port 23 and the exhaust port 24 and the two pilot valves 8a and 8b corresponding to the drive chambers 17a and 17b are provided.

The switching valve 7 is provided with a hollow spool 26, and when air is supplied to one of the pressure action chambers 27a, the spool 26 is moved to the position shown in the drawing so that the through hole 28 and the through hole 29 communicate with each other. One of the drive chambers 17b is connected to the air supply port 23, and the through hole 30
Causes the other drive chamber 17a to communicate with the exhaust port 24, and when air is supplied to the other pressure action chamber 27b, the spool 26 moves to the right, and the through hole 28 and the through hole 30 communicate with each other so that the one drive chamber 17a
Is communicated with the air supply port 23, and the through hole 29 is communicated with the other drive chamber 17b to communicate the drive chamber 17b with the exhaust port 24.

The pilot valves 8a, 8b have a pilot valve element 34 biased in a valve closing direction by a spring 33, as is representatively shown for one pilot valve 8a corresponding to the drive chamber 17a, The pilot valve body 34 has a corresponding diaphragm 6a.
When the valve is pushed by the change lever 36a formed on the shell 35a to open the valve, the drive fluid of the drive chamber 17a is supplied from the pilot through hole 37 to the pressure action chamber 27a of the switching valve 7 to switch the spool 26. Is. Therefore, the other pilot valve 8b corresponding to the drive chamber 17b is opened by being pushed by the change lever 26b formed on the shell 35b of the diaphragm 6b to open the drive fluid of the drive chamber 17b to the pressure action chamber 27b of the switching valve 7. Needless to say, the spool 26 is switched by supplying it to the.

Further, between the outer blocks 39, 39 arranged around the center block 15 and the side covers 16a, 16b, the main fluid to the pump chambers 18a, 18b formed outside the respective diaphragms 6a, 6b is provided. Inlet check valve 10a, which allows only inflow,
10b, the outlet check valve 11a, 11b for allowing only the outflow of the main fluid from the pump chamber 18a, 18b is provided,
Each outer block 39, 39 has an inlet port 40 for the main fluid
And an outlet port 41 is formed.

Further, the silencer 12 is attached to the exhaust port 24 at another corner of the body 5.

Then, on the side surface of the body 5 of the diaphragm pump 1, a joint surface 5a with the pulsation attenuator 2, a fluid connection port 43 for supplying the pressurized main fluid to the pulsation attenuator 2, An air connection port 44 for supplying air to the pulsation attenuator 2 is formed, the fluid connection port 43 communicates with the outlet port 41, and the air connection port 44 communicates with the supply port 23. Further, a plurality of screw holes 45 for screwing the bolts 3 are cut on the side surface of the body 5.

In the diaphragm pump 1 having the above-mentioned structure, as shown in FIGS.
Is connected to the supply port 23 and the other drive chamber 17a is opened to the atmosphere, the diaphragms 6a and 6b move left in the figure, so that the main fluid in the pump chamber 18b is pressurized and the outlet check valve 11b. Is discharged from the inlet port 40 through the inlet check valve 10a in the pump chamber 18a on the opposite side.

Diaphragms 6a, 6b reach the stroke end and shell 3
When the change lever 36b of 5b pushes the pilot valve element of the pilot valve 8b to open it, the air in the drive chamber 17b is supplied to the pressure action chamber 27b of the switching valve 7 and the spool 26 is moved to the right. The chamber 17b is opened to the atmosphere, and the other driving chamber 17a is connected to the supply port 23. Therefore, the diaphragms 6a and 6b move to the right, the main fluid in the pump chamber 18a is pressurized and discharged from the outlet check valve 11a to the outlet port 41, and the other pump chamber 18b is main-passed through the inlet check valve 10b. Fluid is sucked in.

Thus, by repeating the above operation, the main fluid is continuously discharged from the outlet port 41.

On the other hand, the pulsation attenuator 2 is configured as follows.

That is, as shown in FIGS. 7 to 9, the pulsation attenuator 2 is provided with a rectangular plate-shaped body 50 having substantially the same shape as the body 5 of the diaphragm pump 1 and having a slightly small axial length. Diaphragm for pulsation damping inside 50
51 is arranged, and a main fluid chamber 52 to which the main fluid from the diaphragm pump 1 is supplied and an air chamber 53 to which the air is supplied are defined on both sides of the diaphragm 51. , The body 50 communicates with the fluid connection port 55 formed on the joint surface 50a with the diaphragm pump 1, and the air chamber 53 is connected to the joint surface 50a via a pressure adjusting mechanism 57 arranged at one corner of the body 50. Air connection port 50
And the exhaust port 58, by the pressure adjusting mechanism 57,
The air pressure in the air chamber 53 is automatically adjusted according to the pressure level of the main fluid.

A slide block 60 is attached to the diaphragm 51, and the slide block 60 is supported and guided by a guide 61 formed on the air chamber 53 side of the body 50.

The pressure adjusting mechanism 57 includes a supply valve 63 for supplying the air from the air connection port 56 to the air chamber 53 and an exhaust valve 64 for exhausting the air in the air chamber 53 through the exhaust port 58. The supply valve 63 and the exhaust valve 64 are configured as a normally closed type in which the valve bodies 63a, 64a are biased by springs 63b, 64b in the direction of closing the valve seats, and the respective valve bodies 63a, 64a are respectively The tips of the rods 63c and 64c are arranged so as to be opposed to each other by projecting the tips thereof into the air chamber 53.

On the other hand, the shell 66 of the diaphragm 51 is formed with a lever 66a extending in the diametrical direction of the diaphragm 51, and the lever 66a is located in the middle of the valve bodies 63a and 64a of the supply valve 63 and the exhaust valve 64. When the diaphragm 51 moves to the air chamber 53 side beyond the operating range for pulsation damping, the lever 66a pushes the rod 63c of the supply valve body 63a to open the valve body 63a, and the diaphragm 51a is opened. Is moved beyond the operating range to the main fluid chamber 52 side, the lever 66a pushes the rod 64c of the exhaust valve body 64a to open the valve body 64a. Therefore, the above two valve bodies 63
The distance 1 between the tips of the rods 63c, 64c at a, 64a is the operating range for damping the pulsation by the diaphragm 51.

In the pulsation attenuator 2 having the above configuration, the main fluid discharged from the diaphragm pump 1 is supplied to the main fluid chamber 52 through the fluid connection 55 port, and the air from the diaphragm pump 1 is supplied to the air connection port 56 and the pressure adjustment. In a steady state in which the acting forces of the main fluid and air supplied to the air chamber 53 through the mechanism 57 are balanced on both sides of the diaphragm 51, the diaphragm 51 moves in response to the pressure change due to the pulsation of the main fluid. By doing so, the pulsation of the main fluid is absorbed and damped. The displacement of the diaphragm 51 at this time is within the damping operation range, and therefore, the supply valve 63 is moved by the lever 66a.
Also, the exhaust valve 64 is not opened.

Hereinafter, the pulsation of the main fluid is absorbed and attenuated by repeating the above operation, and the main fluid pressure is smoothed.

When the pressure level of the main fluid rises or falls, the balance between the acting forces of the main fluid acting on both surfaces of the diaphragm 51 and the air collapses, so that the diaphragm 51 exceeds the damping operation range and the side of the air chamber 53 or the main Fluid chamber
52 side, the lever 66a is the supply valve body 63a or the exhaust valve body 64
Press a to open it. Therefore, air is supplied into the air chamber 53 or air is discharged from the air chamber 53,
The air pressure in the air chamber 53 is automatically adjusted according to the pressure level of the main fluid so as to balance with it, and the attenuator enters a steady state. Then, the diaphragm 51 is displaced in this state, whereby the pulsation of the main fluid is absorbed and attenuated.

On the side surface of the body 50 of the pulsation attenuator 2, a plurality of connecting holes 67 for inserting the bolt 3 are provided at positions corresponding to the screw holes 45 formed in the body 5 of the diaphragm pump 1. , The diaphragm pump 1 and the pulsation attenuator 2 are joined to each other by inserting the bolt 3 into each connecting hole 67 and screwing the bolt 3 into the screw hole 45 of the diaphragm pump 1. And are connected together.

Thus, when connecting the diaphragm pump 1 and the pulsation damper 2 as described above, the two sets of connection ports 43, 55 and 44, 56 formed on the joint surfaces 5a, 50a of the respective bodies 5, 50 are , To ensure their connection is configured as follows. That is, in the air connection ports 44 and 56, the pulsation attenuator 2
Side connection port 56 is configured as a convex port having an O-ring 56a on the outer circumference of the pipe protruding from the joint surface 50a, and the connection port 44 on the diaphragm pump 1 side is
A recess with a depth where the convex connection port 56 fits fluid-tightly
On the other hand, in the fluid connection ports 43, 55, the connection port 55 on the pulsation attenuator 2 side has a large diameter with an O-ring 55b in the groove 55a on the joint surface 50a side. The connection port 43 on the diaphragm pump 1 side is configured as a flat port having a smaller diameter than the inner diameter of the O-ring 55b.

In this way, one set of connection ports 44 and 56 is a combination of convex ports and concave ports, and the other set of connection ports 43 and 55 is a large-diameter flat port equipped with an O-ring. By combining with the flat port having a smaller diameter than the inner diameter of the O-ring, the connection of each connection port when the diaphragm pump 1 and the pulsation attenuator 2 are directly connected is secured. That is, when the diaphragm pump 1 and the pulsation attenuator 2 are assembled by assembling a plurality of members, the joint surfaces 5a and 50a of them cannot often be finished to a perfect plane.
In such a case, if the two sets of connection ports 43, 55 and 44, 56 that are open at the side surfaces of the bodies 5, 50 are abutted against each other as flat ports, the two bodies 5, 50
Depending on the connection state of the ports, the ports may be displaced forwards and backwards (axial direction) or left and right, causing leakage, but according to the present invention, two sets of connection ports 43, 55 and 44, 56 are forwards and backwards or left and right. Even if there is a slight misalignment, the front and rear misalignment is absorbed by the convex port 56 and the concave port 44, and the left and right misalignment is absorbed by the large and small flat ports 43 and 55, so these connections are secure. become.

It should be noted that the connection port on either side of the diaphragm pump 1 or the pulsation dampener 2 may be a convex port or a large-diameter plane port, and any connection port for fluid or air may be a convex port. A combination of a concave port and a large or small plane port is also optional.

Further, in the pulsation attenuator 2, instead of the diaphragm 51, a piston can be used as a pressure sensitive operating member.

[Effects of the Invention] As described above, according to the present invention, the diaphragm pump and the pulsation attenuator are directly connected by the bolts, so that the number of piping materials and piping man-hours for connection can be reduced. The connecting work can be simplified, and since they are not connected in a state of being separated from each other as in the case of connecting with an external pipe, the whole is very thin and the occupied space is small, It can be installed in a small space.

Also, one of the two sets of connection ports formed on the side surface of the body of the diaphragm pump and the pulsation damper is a combination of a convex port and a concave port, and the other set of connection ports is By combining a large-diameter plane port provided with a ring and a small-diameter plane port smaller than the inner diameter of the O-ring, even if the port is slightly displaced in the front-rear direction or the left-right direction depending on the connection state of the body,
Since the front-rear deviation can be absorbed by the convex port and the concave port and the left-right deviation can be absorbed by the large and small plane ports, the connection between the ports is reliable.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a pump with a pulsation damper according to the present invention, FIG. 2 is a left side view thereof, FIG. 3 is a right side view thereof, and FIG. 4 is a right side view of a diaphragm pump. 5 is a cross-sectional view taken along the line AO-A in FIG. 4, FIG. 6 is a cross-sectional view taken along the line B-O-B in FIG. 4, and FIG. 7 is a front view of the pulsation attenuator. FIG. 8 is a left side view of the pulsation attenuator,
FIG. 9 is a sectional view taken along the line CC in FIG. 1 ... Diaphragm pump, 2 ... Pulsation attenuator, 3 ...
Bolt, 5,50 …… Body, 5a, 50b …… Joint surface, 6a, 6b, 51
...... Diaphragm, 17a, 17b ...... Drive chamber, 18a, 18b ...... Pump chamber, 43,55 ...... Fluid connection port, 44,56 ...... Air connection port, 43a ...... Recess, 55b, 56a ... … O-ring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naotake Koneyama 6-19-1 Inari Soka City, Saitama Prefecture SMC Co., Ltd. Grass processing plant (56) Reference JP-A-63-309788 (JP, A) 1-176267 (JP, U) Actually opened Sho 61-202685 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A pair of diaphragms for partitioning a drive chamber and a pump chamber are built in a rectangular plate-shaped body, and air is alternately supplied to and discharged from the two drive chambers partitioned by these diaphragms. Diaphragm pump that alternately pressurizes and discharges the main fluid in the two pump chambers by reciprocally driving both diaphragms, and a pressure-sensitive operating member consisting of a piston or diaphragm inside the square plate-shaped body A pulsation attenuator that damps the pulsation of the main fluid by the compressibility of the air by opposing the main fluid discharged from the diaphragm pump and the air via the pressure-sensitive operating member. The side surfaces of the body are joined together and then joined by bolts. The diaphragm pump and pulsation attenuator are compatible with their joined surfaces. There are two sets of connection ports through which the main fluid and air flow, and one set of connection ports is a convex port having an O-ring on the outer periphery protruding from the joint surface, and the convex port is fluid-tight. It is configured by a combination with a mating concave port, and the other pair of connection ports is a combination of a large-diameter plane port having an O-ring and a small-diameter plane port smaller than the inner diameter of the O-ring. A pump with a pulsation attenuator characterized by being configured.