JP2920734B2 - Diaphragm pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm pump for pressure-feeding a liquid having no oil lubricity, for example, a liquid such as aqueous ammonia, water, or a chemical.

[0002]

2. Description of the Related Art A diaphragm pump is provided with a power section such as a hydraulic pump and a liquid transport section for transporting liquid at a boundary of the diaphragm, and converts power from the power section into deformation of the diaphragm. The liquid in the liquid transport section is transported by the applied pressure. FIG. 3 shows a schematic diagram of an example of such a diaphragm pump.

[0003] In FIG. 3, a first conduit 34 and a second conduit 3 for circulating a liquid to be transported are provided in a diaphragm chamber 32 located on one side of a diaphragm 31.
5 are connected.

[0004] The first pipe 34 and the second pipe 35 are respectively provided with check valves 3 so that the liquid passing therethrough does not flow backward.
4a, 35a are provided, and the check valves 34a, 3a
5a is arranged such that the liquid flows only from the first conduit 34 through the diaphragm chamber 32 in the direction of the second conduit 35.

A pressure transmission chamber 33, which is a part of a hydraulic pump mechanism 36, is disposed on the other surface of the diaphragm 31. The hydraulic pump mechanism 36 is driven by a motor 37. When the hydraulic pump mechanism 36 is operated, the pressure transmission chamber 33 is configured to be pressurized every predetermined time.

That is, when the inside of the pressure transmission chamber 33 is pressurized by the hydraulic pump mechanism 36, a pressure difference is generated between the inside of the pressure transmission chamber 33 and the inside of the diaphragm chamber 32, and the diaphragm 31 is moved so as to eliminate this pressure difference. It is deformed to the diaphragm chamber 32 side. Therefore, as a result, the inside of the diaphragm chamber 32 is pressurized by the diaphragm 31.

Since the hydraulic pump mechanism 36 pressurizes the pressure transmission chamber 33 every time a predetermined time elapses, the diaphragm 31 is deformed every time the predetermined time elapses, and the diaphragm chamber 32 is pressurized periodically. Becomes As a result, the liquid flowing into the diaphragm chamber 32 from the first conduit 34 is pressurized and discharged from the second conduit 35 every predetermined time.

Here, a hydraulic pump mechanism 36 for deforming the diaphragm 31 every time a predetermined time elapses will be described with reference to FIG. FIG. 3 shows the pressure transmission chamber 3
The schematic configuration of a hydraulic pump mechanism 36 provided with a rotary valve 42 that switches a flow path of hydraulic oil and applies pressure to the hydraulic oil at regular intervals in a path connecting the 3 and the vane pump 41 is shown.

FIG. 4A shows a state in which the rotary valve 42 is open to the pressure transmission chamber 33 (in other words,
FIG. 4B shows a state in which the hydraulic oil tank 43 is closed with respect to the hydraulic oil tank 43 that holds the hydraulic oil, and FIG. (A state in which the rotary valve 42 is in a closed state).

The rotary valve 42 circulates a hydraulic oil flow path between the pressure transmitting chamber 33 side and the hydraulic oil tank 43 side by π.
It is switched alternately every / 4 rotation.
The channel is not opened to the pressure transmission chamber 33 or the hydraulic oil tank 43 unless the rotation is performed by / 4 rotation.

Since hydraulic oil is supplied at a constant rate into the hydraulic oil conduit on the side of the vane pump 41, the rotary valve 42
Is open from the position open to the pressure transmission chamber 33 to the hydraulic oil tank 43 (or the position open from the position open to the hydraulic oil tank 43 to the pressure transfer chamber 33). During the rotation, the inside of the hydraulic oil conduit on the side of the vane pump 41 is pressurized.

Therefore, when the rotary valve 42 is opened to the pressure transmission chamber 33 side (or the hydraulic oil tank 43 side) after the rotation of π / 4, the pressurized hydraulic oil is immediately blown to the pressure transmission chamber 33 side (by the pressure). Or, it is discharged to the hydraulic oil tank 43). Therefore, the hydraulic oil flowing on the pressure transmission chamber 33 side (or the hydraulic oil tank 43 side) pulsates at a speed corresponding to the rotation speed of the rotary valve 42.

The rotary shaft 42 of the rotary valve 42
a and a pump shaft 41a of the vane pump 41 are connected by a gear mechanism (not shown). The gear mechanism (not shown) controls the rotation speed of the pump shaft 41a rotating at a high speed and the rotary valve 42 rotating at a low speed. (For example, 104 r / min).

As described above, the inside of the hydraulic oil passage on the side of the pressure transmission chamber 33 is periodically pressurized in accordance with the rotation speed of the rotary valve 42, so that the diaphragm 31 corresponds to this period. It will deform (ie, pulsate). Thereby, the inside of the diaphragm chamber 32 is also pressurized in accordance with the deformation of the diaphragm 31, so that the diaphragm chamber 3
Pressure is applied to the liquid filled in 2, whereby the liquid in the diaphragm chamber 32 is led out from the second conduit 35.

That is, the first conduit 34, the diaphragm chamber 32
And the liquid filled in the second conduit 35 is the first conduit 3
4 flows through the diaphragm chamber 32 in the direction of the second conduit 35.

[0016]

However, the diaphragm pump using the hydraulic pump mechanism having such a configuration is provided with a separate device for converting the power from the hydraulic pump mechanism into a periodic pressure. It becomes large.

Further, in order to drive the pump means such as the vane pump, the number of rotations of the drive means such as a motor must be increased, so that there is a problem that noise is generated with the drive of the pump section.

Accordingly, an object of the present invention is to provide a diaphragm pump that is smaller and has lower noise than conventional ones.

[0019]

In order to achieve the above object, an object of the present invention is to transmit a reciprocating motion of a piston to a pressure transmission chamber located on one surface side of a flexure diaphragm by using hydraulic oil as a medium. By deforming the diaphragm, a diaphragm pump for pumping the liquid sucked from the inlet port to the diaphragm chamber located on the other surface side of the diaphragm from the outlet port, the inlet port, the outlet port, the upper surface recess forming the diaphragm chamber, A first block structure including a first check valve that allows only a liquid flow from the inlet port toward the upper surface concave portion and a second check valve that allows only a liquid flow from the upper surface concave portion toward the outlet port; Forming a lower surface recess, a cylinder chamber communicating with the lower surface recess, and increasing and decreasing the volume of the cylinder chamber by reciprocating motion. Stone, elastic member the piston the volume of the cylinder chamber to always urges the direction of increasing, the
As the piston reciprocates, the piston moves into the cylinder
The cylinder only when it is in the position that maximizes the volume of the chamber
The passage communicating with the chamber and the pressure value in the cylinder chamber are
A second block assembly provided with a relief valve for adjusting so as not to exceed a predetermined maximum value, and being sandwiched between the first block assembly and the second block assembly via a peripheral seal packing. A flexible diaphragm partitioning between the upper surface concave portion and the lower surface concave portion, and a hydraulic oil tank on the second block structure so as to include a head exposed portion of the piston in a state of being laminated on the second block structure. Forming a chamber
A cavity communicating with the passage of the second block structure
A rotary drive shaft that is driven to rotate from the outside, a bearing that supports the rotary drive shaft so as to extend into the cavity, and an eccentric circular cam that is fixed to the rotary drive shaft and reciprocates the piston. And a third block structure.

[0020]

The diaphragm pump of the present invention is provided on the first block portion A provided on the diaphragm chamber 2 side and on the power transmission chamber 3 side with respect to the diaphragm chamber 2 and the power transmission chamber 3 separated by the diaphragm 1. And a second block portion B and a third block portion C.

First, the first block structure includes a diaphragm chamber located on one surface side of the diaphragm, an inlet port for introducing a liquid into the diaphragm chamber, and a pressure applied to the liquid when pressure is applied to the diaphragm chamber. And an outlet recess for discharging the liquid.

The upper concave portion is provided with a first check valve which allows only the liquid flow from the inlet port to the upper concave portion, and a second check valve which allows only the liquid flow from the upper concave portion to the outlet port. When the pressure applied to the liquid introduced into the diaphragm chamber from the inlet port is applied, the liquid is always drawn out from the outlet port.

That is, since the diaphragm chamber of the first block structure is located on one surface side of the diaphragm, its volume changes according to the deformation of the diaphragm, and the internal pressure changes. In other words, when the diaphragm bends to the pressure transmission chamber side of the second block structure to be described later, the volume of the diaphragm chamber increases, so that the pressure in the chamber decreases, and conversely, when the diaphragm bends to the diaphragm chamber side, As a result, the pressure of the diaphragm chamber decreases as the volume of the diaphragm chamber decreases.

Therefore, when the diaphragm is bent toward the pressure transmitting chamber, the liquid flows from the inlet port with the force of the bending of the diaphragm and is introduced into the diaphragm chamber. On the contrary, when the diaphragm flexes toward the diaphragm chamber,
Pressure is applied to the liquid introduced into the diaphragm chamber, and the liquid is drawn out of the diaphragm chamber and discharged from an outlet port.

Next, the second block structure is a portion which converts a periodic motion from an eccentric circular cam, which will be described later, into a linear motion and deforms the diaphragm at regular intervals, and is located on the other surface side of the diaphragm. A lower surface concave portion forming a pressure transmitting chamber, a cylinder chamber communicating with the lower surface concave portion, a piston that increases and decreases the volume of the cylinder chamber by reciprocating motion, and constantly urges the piston in a direction in which the volume of the cylinder chamber increases. An elastic member and an oil guide path for filling the cylinder chamber with hydraulic oil and a third check valve for preventing a flow of hydraulic oil flowing backward from the cylinder chamber to the oil guide path are provided.

The power transmission chamber of the second block structure is a room located on the other surface side of the diaphragm, and the diaphragm is pressed by hydraulic oil introduced into the power transmission chamber, and the volume of the power transmission chamber changes. I do. Hydraulic oil is introduced from a cylinder chamber communicating with the power transmission chamber. This cylinder chamber is configured so that its volume changes with the reciprocation of the piston, and the volume of the cylinder chamber changes. Hydraulic oil moves between the power transmission chamber and the cylinder chamber.

The piston is constantly urged by an elastic member such as a spring in a direction to increase the volume of the cylinder chamber.
When it is pressed by a force from an eccentric circular cam described later, it moves to the power transmission chamber side.

That is, when the piston moves toward the power transmission chamber, the volume of the cylinder chamber becomes small, so that the cylinder chamber is pressurized and hydraulic oil is introduced into the power transmission chamber. Conversely, when the piston is pressed by the spring and moves in the direction in which the volume of the cylinder chamber increases, the volume of the cylinder chamber increases along with this movement, so that the pressure in the cylinder chamber is reduced, and the hydraulic oil in the power transmission chamber is discharged from the cylinder chamber. Will be introduced.

Accordingly, the hydraulic oil moves back and forth between the power transmission chamber and the cylinder chamber with the reciprocating motion of the piston, whereby the diaphragm bends at regular intervals.
The volume of the diaphragm chamber changes, and the liquid inside the diaphragm chamber is extruded toward the transport pipe and is drawn out from the outlet port.

When the piston moves toward the power transmission chamber, the pressure in the cylinder chamber is increased, but the pressure in the hydraulic oil tank provided on the opposite side of the piston is reduced. The pressure in the cylinder chamber is higher than in the tank.

Therefore, a phenomenon occurs in which the hydraulic oil leaks to the hydraulic oil tank from between the piston and the sleeve engaged with the piston. For this reason, hydraulic cylinder tank
There is a passage that communicates with the
Open when the oil is located closest to the hydraulic oil tank.
It has become. This is caused by the reciprocating movement of the piston.
If hydraulic oil leaks from between the leave and the piston,
Because the pressure on the transmission chamber decreases, the piston
Provide a passage that opens when it is located closest to the hydraulic oil tank
This prevents such a decrease in pressure. Die
When the piston moves toward the power transmission chamber,
The piston deforms toward the diaphragm chamber and the piston moves toward the hydraulic oil tank.
When it is moved to the power transmission chamber side
But the piston is located closest to the power transmission chamber
The diaphragm is completely deformed toward the diaphragm chamber.
It is possible that this is not the case.
Hydraulic oil is not completely deformed from the open passage
An extra amount of fluid flows into the cylinder chamber. This state
When the piston moves to the power transmission chamber side,
And excessive pressure in the power transmission chamber
In the case of, it is considered that it is damaged. like this
To prevent accidents, the cylinder chamber is released as a safety valve.
An oil guide passage having a valve is provided. This relief valve
Indicates that the maximum pressure value in the cylinder chamber is greater than a predetermined value.
Automatically opens the valve when it becomes difficult to
Releases hydraulic fluid and the maximum pressure value inside the cylinder chamber is determined in advance.
Value is adjusted so as not to exceed. This allows the die
Afram will always be given a certain amount of repression.
ing. Therefore, due to the pressure change in the diaphragm chamber,
The liquid to be conveyed is also suppressed and conveyed with a certain force
Becomes In addition, as another aspect of the second block structure,
Hydraulic oil flows from between the leave and piston to the hydraulic oil tank
To prevent pressure drop due to leakage phenomenon
Because the oil guide passage to meet the shortage of hydraulic fluid to the cylinder chamber to the second block structure, be provided with third check valve hydraulic oil from the cylinder chamber to the oil guide passage is prevented from flowing back good.

Thus, even if the hydraulic oil leaks from the cylinder chamber side to the hydraulic oil tank side, the leaked amount passes through the third check valve and is replenished to the cylinder side, so that a constant pressure is always applied to the cylinder chamber. Can be given. Therefore, the diaphragm pressed according to the pressure in the cylinder chamber also receives a constant force, and the liquid conveyed by the pressure change in the diaphragm chamber is also conveyed with a constant force.

Further, the third block structure is a portion for generating power for deforming the diaphragm, and is operated on the second block structure so as to include the head exposed portion of the piston in a state of being laminated on the second block structure. Forming an oil tank chamber
A cavity communicating with the passage of the second block structure, a rotary drive shaft rotatably driven from the outside, a bearing supporting the rotary drive shaft so as to extend into the cavity, and a piston fixed to the rotary drive shaft. And a reciprocating eccentric circular cam.

That is, since the eccentric cam rotating with the rotation of the rotary drive shaft gives a sinusoidal motion to the above-mentioned piston via the dependent element by the rotation of the eccentric circle,
The piston reciprocates at a speed corresponding to the rotation of the rotary drive shaft.

Since the distance of the reciprocating motion of the piston is determined by the size and the amount of eccentricity of the eccentric circle, the magnitude of the pressure on the cylinder chamber is adjusted by adjusting the size and the amount of eccentricity of the eccentric circle. be able to.

Therefore, by controlling the number of rotations of the rotary drive shaft and the size and amount of eccentricity of the eccentric circular cam, the amount of pressurization and the pressurizing cycle in the cylinder chamber are controlled, and as a result, the liquid to be transferred Can be adjusted.

Further , the second block structure may be replaced with the above-described another embodiment.
In the case of the third block structure, the third block structure is configured as follows.
To achieve. That is, the third block structure, setting the oil supply port communicating with the cavity to form a hydraulic oil tank chamber, and a supply passage communicating the oil guide passage of the cavity and the second block structure
When the operating oil leaks from the cylinder chamber side to the operating oil tank side, the operating oil in the operating oil tank chamber is supplied to the oil guide path of the second block structure.

[0038]

FIG. 1 is a schematic explanatory view showing the structure of a first embodiment of the present invention. The diaphragm pump shown in FIG.
The first block portion A, the second block portion B and the third block portion
It is composed of three parts called a block part C. Hereinafter, the first block portion A, the second block portion B, and the third block portion C will be described in more detail.

First, the first block section A includes a diaphragm chamber 2 and an inlet port 5a for introducing a liquid to be conveyed.
Check ports 4a and 4b provided between the inlet port 5a and the outlet port 5b to prevent the introduced liquid from flowing back, and these check valves There are provided six insertion holes x (the number of the insertion holes x is not particularly limited) provided between 4a and 4b and connected to the diaphragm chamber 2.

The liquid passing through the first block portion A is introduced from the inlet port 5a, passes through the check valves 4a and 4b, and is drawn out from the outlet port 5b. An insertion hole x communicating with the diaphragm chamber 2 is provided, and a liquid is introduced into the diaphragm chamber 2 through the insertion hole x.

Next, the second block portion B includes a power transmission chamber 3
, A cylinder chamber 6 filled with hydraulic oil, a power transmission chamber 3 in the cylinder chamber 6, and a hydraulic oil tank 18 described later.
And a spring 8 that is an elastic member that urges the piston 7 toward the hydraulic oil tank 18 when no force is applied to the piston 7.

The cylinder chamber 6 is provided with six insertion holes y (the number of the insertion holes y is not particularly limited) connected to the power transmission chamber 3, and the piston 7 is provided with a power from a third block C described later. When the cylinder moves to the power transmission chamber 3 side, the inside of the cylinder chamber 6 is pressurized, and the hydraulic oil in the cylinder chamber 6 is introduced into the power transmission chamber 3 through the insertion hole y.

Therefore, when the hydraulic oil in the cylinder chamber 6 is introduced into the power transmission chamber 3 through the insertion hole y, one surface forms one surface of the power transmission chamber 3 and the other surface forms the diaphragm chamber 2. Is deformed toward the diaphragm chamber 2 side and pressurizes the inside of the diaphragm chamber 2, so that the liquid in the diaphragm chamber 2 is pressurized. Therefore, the liquid in the diaphragm chamber 2 flows into the conduit between the inlet port 5a and the outlet port 5b through the insertion hole x.

As described above, the check valves 4a and 4b are provided between the inlet port 5a and the outlet port 5b. These check valves limit the flow of the liquid. Before the liquid is pressurized in the pipeline, the liquid is discharged to the outside from the outlet port 5b via the check valve 4b.

Conversely, when the piston 7 does not receive power from a third block portion C described later, the spring 8
In the direction in which the volume of the cylinder chamber 6 increases,
The pressure in the cylinder chamber 6 is reduced.

Therefore, the hydraulic oil in the power transmission chamber 3 is introduced into the cylinder chamber 6 through the insertion hole y, so that the pressure in the power transmission chamber 3 is also reduced, and the diaphragm 1 is deformed to the power transmission chamber 3 side. Thus, the pressure in the diaphragm chamber 2 is reduced.

Therefore, the liquid in the diaphragm chamber 2 is decompressed, so that the liquid flows into the diaphragm chamber 2 from the conduit between the inlet port 5a and the outlet port 5b through the insertion hole x.

Check valves 4a and 4b are provided between the inlet port 5a and the outlet port 5b to restrict the flow of the liquid, so that the liquid passes through the insertion hole x and passes through the diaphragm chamber. When the liquid flows into the pipe 2, liquid from the outside is introduced from the inlet port 5a before the pressure in the pipeline between the inlet port 5a and the outlet port 5b is reduced.

That is, when the piston 7 moves to the power transmission chamber 3 side, the liquid is drawn out from the outlet port 5b, and when the piston 7 moves to the hydraulic oil tank 18 side, the external liquid is introduced from the inlet port 5a. The Rukoto.

The cylinder chamber 6 is provided with a check valve 10 which communicates with a hydraulic oil tank 18 which forms a part of the third block portion C and which allows hydraulic oil to flow only from the hydraulic oil tank 18 toward the cylinder chamber 6. Oil guide 11a is provided, and the oil supply port 11c is provided from an oil supply passage 11b provided in the hydraulic oil tank 18.
The hydraulic oil is introduced into the cylinder chamber 6 through the cylinder.

This is because when hydraulic oil leaks from between the sleeve 9 and the piston 7 as the piston 7 reciprocates,
By allowing the hydraulic oil to flow into the cylinder chamber 6 from the oil supply passage 11b through the oil introduction port 11c and the check valve 10, a constant amount of the hydraulic oil is always filled in the cylinder chamber 6. Thus, a constant pressing force is always applied to the diaphragm. Therefore, the liquid conveyed by the pressure change in the diaphragm chamber is also pressed and conveyed by a constant force.

Further, the third block portion C is disposed on the second block portion B in a stacked manner, and is provided in a hydraulic oil tank 18 for holding hydraulic oil, and a bearing provided outside the hydraulic oil tank 18. External pulley 1 supported by 15a, 15b
The rotary drive shaft 16 is driven by the rotary shaft 7 and eccentric circular cam mechanisms 13 and 14 fixed to the rotary drive shaft 16 and reciprocating a piston.

The eccentric circular cam mechanisms 13 and 14
And a ball 14 as a slave having a shape such that the contact point is aligned even when the eccentric circle 13 rotates. The ball 14 is arranged so as to always contact the outer peripheral wall of the eccentric circle 13, and the eccentric circle 13 has its rotation center provided at an eccentric position.

Therefore, the ball 14 is located at the lowest position when the distance from the center of rotation of the eccentric circle 13 to the contact position between the ball 14 and the eccentric circle 13 is the longest. When the distance to the contact position is shortest, it is arranged at the highest position.

Since the ball 14 is disposed so as to contact the piston 7 on the side opposite to the side contacting the eccentric circle 13, when the ball 14 is at the lowest position, the piston 7 is moved to the cylinder chamber. When it is pressed to the side of the cylinder chamber 6 and is arranged at the highest position, the pressing to the side of the cylinder chamber 6 is stopped.

As described above, when the piston 7 is not pressed toward the cylinder chamber 6, it is pushed back by the spring 8. As a result, the piston 7 moves to the hydraulic oil tank 18. That is, the ball 14 periodically moves with the rotation of the rotary drive shaft 16 and the piston 7
Will reciprocate.

Since the distance of the reciprocating movement of the piston 7 is determined by the size and the amount of eccentricity of the eccentric circle 13,
By adjusting the size and the amount of eccentricity of the eccentric circle 13, the magnitude of the pressure on the cylinder chamber 6 can be adjusted.

Therefore, by controlling the number of rotations of the rotary drive shaft 16 and the size and the amount of eccentricity of the eccentric circle 13, the amount of pressurization and the pressurization cycle in the cylinder chamber 6 are controlled, and consequently, Can be adjusted.

As described above, in the first embodiment, the eccentric circular cam mechanisms 13 and 14 are used to reciprocate the piston 7 by using the eccentricity of the eccentric circle 13 to deform the diaphragm 1. It is not necessary to rotate the pulley 17 for rotating the circle 13 at high speed, and it is possible to prevent the generation of noise.

On a first block A for transmitting pressure to the liquid in the pipeline, a second block B for applying pressure to the liquid in the pipeline at regular intervals, and the second block B The configuration is such that the third block portion C that supplies power to the portion B is laminated, so that the entire device is more compact than a conventional device. Therefore, the transport line can be freely designed in a factory or the like.

FIG. 2 is a schematic explanatory view showing the structure of the second embodiment of the present invention. In FIG. 2, parts that are the same as or correspond to the diaphragm pump of the first embodiment described above are given the same reference numerals.

The diaphragm pump shown in FIG. 2 is roughly composed of three parts, a first block part A, a second block part B and a third block part C. Hereinafter, the first block portion A, the second block portion B, and the third block portion C will be described in more detail.

First, the first block portion A includes a diaphragm chamber 2 and an inlet port 5a for introducing a liquid to be conveyed.
And an outlet port 5b for taking out the liquid to be conveyed, and first and second ports (not shown) provided between the inlet port 5a and the outlet port 5b for preventing the introduced liquid from flowing backward. And two check valves. Six insertion holes x (the number of the insertion holes x is not particularly limited) connected to the diaphragm chamber 2 are provided between the first and second check valves.

The liquid passing through the first block portion A is introduced from the inlet port 5a, passes through the first check valve, and is drawn out from the outlet port 5b. Is provided with an insertion hole x communicating with the diaphragm chamber 2, and a liquid is introduced into the diaphragm chamber 2 through the insertion hole x.

Next, the second block portion B is connected to the power transmission chamber 3.
, A cylinder chamber 6 filled with hydraulic oil, a power transmission chamber 3 in the cylinder chamber 6, and a hydraulic oil tank 18 described later.
And a spring 8 that is an elastic member that urges the piston 7 toward the hydraulic oil tank 18 when no force is applied to the piston 7.

The cylinder chamber 6 is provided with two insertion holes y (the number of the insertion holes y is not particularly limited) connected to the power transmission chamber 3, and the piston 7 is provided with a power from a third block C described later. When the cylinder moves to the power transmission chamber 3 side, the inside of the cylinder chamber 6 is pressurized, and the hydraulic oil in the cylinder chamber 6 is introduced into the power transmission chamber 3 through the insertion hole y.

Accordingly, when the hydraulic oil in the cylinder chamber 6 is introduced into the power transmission chamber 3 through the insertion hole y, one surface forms one surface of the power transmission chamber 3 and the other surface forms the diaphragm chamber 2. Is deformed toward the diaphragm chamber 2 side and pressurizes the inside of the diaphragm chamber 2, so that the liquid in the diaphragm chamber 2 is pressurized. Therefore, the liquid in the diaphragm chamber 2 flows into the conduit between the inlet port 5a and the outlet port 5b through the insertion hole x.

As described above, the first and second check valves are provided between the inlet port 5a and the outlet port 5b. These check valves limit the flow of the liquid. The liquid that has flowed into the outlet is discharged to the outside from the outlet port 5b via the second check valve before pressurizing the inside of the pipeline.

On the contrary, when the piston 7 does not receive the power from the third block portion C described later, the spring 8
In the direction in which the volume of the cylinder chamber 6 increases,
The pressure in the cylinder chamber 6 is reduced.

Therefore, the hydraulic oil in the power transmission chamber 3 is introduced into the cylinder chamber 6 through the insertion hole y, so that the pressure in the power transmission chamber 3 is also reduced, and the diaphragm 1 is deformed to the power transmission chamber 3 side. Thus, the pressure in the diaphragm chamber 2 is reduced.

Accordingly, the liquid in the diaphragm chamber 2 is decompressed, so that the liquid flows into the diaphragm chamber 2 from the pipe between the inlet port 5a and the outlet port 5b through the insertion hole x.

A check valve is provided between the inlet port 5a and the outlet port 5b, which restricts the flow of the liquid. Therefore, the liquid flows through the insertion hole x into the diaphragm chamber 2. When it flows in, inlet port 5a and outlet port 5
Before the pressure in the pipeline between the first and second b is reduced, a liquid from the outside is introduced from the inlet port 5a.

That is, when the piston 7 moves to the power transmission chamber 3 side, the liquid is drawn out from the outlet port 5b, and when the piston 7 moves to the hydraulic oil tank 18 side, the external liquid is introduced from the inlet port 5a. The Rukoto.

The hydraulic oil tank 1 is provided in the cylinder chamber 6.
A passage 22 communicating with the passage 8 is provided.
Is opened when the piston 7 is located closest to the hydraulic oil tank 18.

This is because when hydraulic oil leaks from between the sleeve 9 and the piston 7 with the reciprocating movement of the piston 7,
Since the pressure applied to the power transmission chamber 3 is reduced, such a decrease in pressure is prevented by providing a passage 22 that opens when the piston 7 is located closest to the hydraulic oil tank 18.

When the piston 7 moves to the power transmission chamber 3 side, the diaphragm 1 is deformed to the diaphragm chamber 2 side,
When the piston 7 moves toward the hydraulic oil tank 18, the piston 1 is deformed toward the power transmission chamber 3. However, when the piston 7 is positioned closest to the power transmission chamber 3, the diaphragm 1 is completely moved toward the diaphragm chamber 2. In such a case, the hydraulic oil may flow into the cylinder chamber 6 from the passage 22 as much as the diaphragm 1 is not completely deformed.

If the piston 7 moves toward the power transmission chamber 3 in this state, excessive pressure is applied to the cylinder chamber 6 and the power transmission chamber 3, and in the worst case, the piston 7 may be damaged.

In order to prevent such a situation, the cylinder chamber 6
Has an oil guide passage 11 provided with a relief valve 21 as a safety valve.
a is provided. When the maximum pressure value in the cylinder chamber 6 becomes larger than a predetermined value, the relief valve 21 automatically opens the valve to release the hydraulic oil inside the cylinder chamber 6 and to release the maximum pressure inside the cylinder chamber 6. The value is adjusted so that it does not exceed a predetermined value.

As a result, a constant pressing force is always applied to the diaphragm 1. Therefore, the liquid conveyed by the pressure change in the diaphragm chamber 2 is also pressed and conveyed by a constant force.

Further, the third block portion C is disposed on the second block portion B in a stacked manner, and is provided in a hydraulic oil tank 18 for holding hydraulic oil and a bearing provided outside the hydraulic oil tank 18. External pulley 1 supported by 15a, 15b
The rotary drive shaft 16 is driven by the rotary shaft 7 and eccentric circular cam mechanisms 13 and 23 fixed to the rotary drive shaft 16 to reciprocate the piston.

The eccentric circular cam mechanisms 13 and 23
And a needle bearing 23 provided along the outer peripheral wall of the eccentric circle 13. The needle bearing 23 includes the outer race 23 b and the inner race 2.
The outer race 23b is in contact with the uppermost portion of the piston 7 with the needle 23a interposed therebetween.

Since the eccentric circle 13 is provided at a position where the center of rotation is eccentric, when the distance from the center of rotation of the eccentric circle 13 to the top of the piston 7 is the longest, the piston 7 is moved toward the cylinder chamber 6. When the distance from the center of rotation of the eccentric circle 13 to the uppermost part of the piston 7 is shortest, the pressing toward the cylinder chamber 6 is stopped.

As described above, when the piston 7 is not pressed toward the cylinder chamber 6, it is pushed back by the spring 8. As a result, the piston 7 moves to the hydraulic oil tank 18. That is, since the piston 7 is periodically pressed with the rotation of the rotary drive shaft 16, the piston 7 reciprocates periodically.

Since the distance of the reciprocating movement of the piston 7 is determined by the size and the amount of eccentricity of the eccentric circle 13,
By adjusting the size and the amount of eccentricity of the eccentric circle 13, the magnitude of the pressure on the cylinder chamber 6 can be adjusted.

Therefore, by controlling the number of rotations of the rotary drive shaft 16 and the size and the amount of eccentricity of the eccentric circle 13, the amount of pressurization and the pressurizing cycle in the cylinder chamber 6 are controlled, and as a result, Can be adjusted.

As described above, in the second embodiment, the eccentric circular cam mechanisms 13 and 23 using the needle bearings are used, and the piston 7 is reciprocated using the eccentricity of the eccentric circle 13 to deform the diaphragm 1. Eccentric circle 13
There is no need to rotate the pulley 17 for rotating
Generation of noise can be prevented.

On the first block A for transmitting pressure to the liquid in the pipeline, a second block B for applying pressure to the liquid in the pipeline at regular intervals, and the second block B The configuration is such that the third block portion C that supplies power to the portion B is laminated, so that the entire device is more compact than a conventional device. Therefore, the transport line can be freely designed in a factory or the like.

[0088]

As described above, since the diaphragm pump of the present invention uses the eccentric circular cam as a power source, the number of rotations of the rotary drive shaft can be suppressed low, and the generation of noise can be prevented. .

Since the third block structure and the second block structure are provided on the first block structure, it is not necessary to provide a special place for arranging the third block structure and the second block structure. .

That is, since the diaphragm pump of the present invention has a structure in which the first block structure, the second block structure, and the third block structure are laminated and integrated, a large space is not required, and the transfer line can be freely formed. It is possible to design

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a first embodiment of a diaphragm pump according to the present invention.

FIG. 2 is a schematic explanatory view showing a second embodiment of the diaphragm pump of the present invention.

FIG. 3 is a circuit diagram showing a schematic configuration of a conventional diaphragm pump.

FIG. 4 is an explanatory view of a conventional diaphragm pump.

[Explanation of symbols]

 A first block portion B second block portion C third block portion 1, 31 diaphragm 2, 32 diaphragm chamber 3, 33 power transmission chamber 4a, 4b, 34a, 35a check valve 5a inlet port 5b outlet port 6 cylinder chamber 7 Piston 8 Spring 9 Sleeve 10 Check valve 11a Oil guide path 11b Oil supply path 11c Oil guide port 13 Eccentric circle 14 Ball 15a, 15b Bearing 16 Rotation drive shaft 17 Pulley 18 Hydraulic oil tank 21 Relief valve 22 Passage 23a Needle 23b Outer race 23c Inner race 34 First pipeline 35 Second pipeline 36 Hydraulic pump mechanism 37 Motor 41 Vane pump 41a Pump shaft 42 Rotary valve 42a Rotary shaft of rotary valve 43 Hydraulic oil tank x, y insertion hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04B 43/067 F04B 43/02

Claims (1)

(57) [Claims] 1. A diaphragm chamber which is deformed by transmitting reciprocating motion of a piston using hydraulic oil as a medium into a pressure transmission chamber located on one surface side of a flexure diaphragm, thereby deforming the diaphragm, and a diaphragm chamber located on another surface side of the diaphragm. Diaphragm pump for pumping liquid sucked from an inlet port from an outlet port to the inlet port, the outlet port, an upper surface recess forming a diaphragm chamber, and a first check which allows only a liquid flow from the inlet port to the upper surface recess. A first block structure including a valve and a second check valve that allows only a liquid flow from the upper surface recess to the outlet port; a lower surface recess forming a pressure transmission chamber; a cylinder chamber communicating with the lower surface recess; Piston that increases or decreases the volume of the cylinder chamber by increasing the volume of the cylinder chamber Elastic member, the piston constantly biased to direction
As the piston reciprocates, the piston has the capacity of the cylinder chamber.
Only when it is in the position that maximizes
Passage, the pressure value in the cylinder chamber is predetermined.
A second block structure provided with a relief valve for adjusting the maximum value so as not to exceed the maximum value . The second block structure is sandwiched between the first block structure and the second block structure via a peripheral seal packing, and the upper surface recess and a flexure diaphragm partitioning the space between the lower recesses, in a state where the stacked on the second block structure, wherein the forming a hydraulic oil tank chamber on the second block structure so as to include a head uncovered portion of said piston first The two-block structure
A cavity communicating with the passage, a rotary drive shaft rotationally driven from the outside, a bearing supporting the rotary drive shaft so as to extend into the cavity, and an eccentric fixed to the rotary drive shaft to reciprocate the piston A diaphragm pump comprising: a third block structure having a circular cam;