JP2001082341A - Diaphragm pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the damage to a diaphragm even if a pressure difference occurs in pump chambers by forming the shapes of the thin wall parts of the pump chamber formed of the diaphragm in different shapes from each other so as to be mostly suitable for the average pressure of the pressure in the pump chambers during the operation of a pump. SOLUTION: This diaphragm pump comprises the different shapes of thin wall parts 8a and 8b of the diaphragm 8 forming the pump chamber 7A connected to a suction port 9 and the pump chamber 7B connected to an delivery port 10. The pump is used for decompression, and a pressure is higher in the pump chamber 7B than in the pump chamber 7A. Thus, the pump chamber 7A comprises a thin wall part 8a of inverse U-shape in cross-section suitable for the pump chamber with lower pressure, and the other pump chamber 7B comprises a rather flat thin wall part 7b suitable for approximately the same pressure as an external pressure. Thus, both pump chambers can form a pump capable of performing an optimum motion, eliminating the occurrence of cracking and providing an excellent durability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small pump using a diaphragm.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional diaphragm pump. 1 is a driving motor, 2 is a motor output shaft, 3 is a crank base fixed to an output shaft 2, and 4 is a crank base 3. A drive shaft 5 mounted to be inclined with respect to the disk 5 is a disk-shaped drive body rotatably mounted on the drive shaft 4, 6
A and 6B are a plurality of pistons arranged at equal intervals around the driving body 5, and a plurality of pump chambers arranged along the circumference (the illustrated pump comprises only two pump chambers 7A and 7B). In the example of the pump, both pump chambers 7A and 7B are located at opposite positions 180 ° apart from each other on the same circumference) and can reciprocate. 8 is a pump room 7A, 7
B and the piston 6 are connected and held so that the pump chambers 7A and 7B are kept airtight.
A suction port 10 communicating with the pump chamber 7A via 1 is a discharge port communicating with the pump chamber 7B via the check valve 15.

[0003] Also, reference numerals 11, 12, 14, and 15 denote check valves, and 13 denotes one pump chamber 7A and another pump chamber 7A.
This is a path connecting B. This pump has a diaphragm 8
Are formed integrally with the pistons 6A and 6B,
A and 6B are integrally connected by a diaphragm 8 and a peripheral portion 8c of the diaphragm accommodates a drive mechanism portion including a lid 16 forming pump chambers 7A and 7B, a crank base 3, a drive shaft 4, a drive body 5, and the like. It is fixed by being sandwiched by a case 17 that does.

In this conventional diaphragm pump, the crankshaft 3 is rotated by the rotation of the output shaft 2 by the motor 1, and the driving body 5 moves as shown by the arrow while changing its inclination by the movement of the driving shaft 4. I do. The left and right pistons 6A and 6B alternately move up and down by the movement of the driving body 5 to perform a pump action. That is, when the piston 6A moves downward, the volume of the pump chamber 7A becomes large, and the fluid flows into the pump chamber 7A from outside through the suction port 9 and the valve 11 is opened. At this time, the valve 12 is closed. At the same time piston 6B
Rises and the volume of the pump chamber 7B decreases, so that the fluid in the pump chamber 7B opens the valve 15 and is discharged from the discharge port 10 to the outside of the pump. At this time, the valve 14 is closed. Subsequently, the piston 6A moves up and the piston 6B moves down. As a result, the volume of the pump chamber 7A decreases and the volume of the pump chamber 7B increases. Thus, the fluid in the pump chamber 7A opens the valve 12, passes through the passage 13, and is sent toward the pump chamber 7B. At the same time, the valve 14 is opened by the action of the piston 6B, and the fluid enters the pump 7B from the passage 13. Further, the movement of the driving body 5 lowers the piston 6A and raises the piston 6B, so that the pump chamber 7A sucks fluid from the suction port 9 and discharges fluid from the pump chamber 7B through the discharge port 10.

[0005] As described above, the conventional diaphragm pump shown in FIG.
6B, the fluid is sucked from the suction port 9 and flows into the pump chamber 7A, and the fluid that flows into the pump chamber 7A flows through the passage 13 into the pump chamber 7B. The fluid that has flowed into 7B is discharged from discharge port 10.

In the pump shown in FIG. 5, the suction port 9 is connected to a tank or the like, and air, other gas or other fluid inside the tank or the like is sucked into the pump from the suction port 9 and the inside of the tank or the like. Used to reduce the pressure of

That is, by the operation of the pump described above, the fluid inside the tank or the like flows into the pump chamber 7A through the suction port 9 and is further sent to the pump chamber 7B through the fluid in the pump chamber 7A and the passage 13. It is discharged to the outside through the discharge port 10 from 7B. By discharging the fluid inside the tank or the like to the outside in this manner, the pressure of the fluid inside the tank or the like is reduced.

The pump shown in FIG. 5 is a pump comprising two pump chambers, ie, pump chambers 7A and 7B, but may be constituted by three or more pumps as described above. That is, three or more pumps are arranged at equal intervals along the circumference, one of the first pump chambers is connected to the suction port, and the other is connected to the adjacent second pump chamber by a check valve. , And the third, fourth,... Pump chambers are sequentially connected, and the last pump chamber is connected to the discharge port.

In the pump having three or more pump chambers as described above, the fluid flows into the first pump chamber from the suction port by the movement of the piston by the same driving mechanism as shown in FIG. .. From the chamber to the second, third,... Pump chambers, and from the last pump chamber through the outlet.

As described above, the pump composed of two pump chambers or the pump composed of a plurality of pump chambers of the same principle shown in FIG. It is.

Such a series diaphragm pump comprising three or more pump chambers also has a tank in which air, gas or other fluid is stored in the suction port, similarly to the above-mentioned series diaphragm pump comprising two pump chambers. Connected to the pump and suck the fluid in the tank from the suction port by operating the pump.
, And sequentially sent to the second, third,... Pump chambers and discharged from the last pump chamber through the discharge port to the outside of the pump. This is used to reduce the pressure of the fluid in the tank.

[0012] In such a series diaphragm pump, for example, fluid flows into the first pump chamber from the suction port,
The fluid is sequentially sent through the second, third,... Pump chambers, and the pressure is increased by pressurizing the fluid in each pump chamber, and the highest pressure is obtained in the last pump chamber connected to the discharge port. It is also used to feed a high-pressure fluid such as high-pressure air into a tank or the like. That is, it is also used for pressure increase.

FIG. 6 shows an example of a pump having two pump chambers among the series diaphragm pumps designed for increasing the pressure.

The pump shown in FIG. 6 has substantially the same structure as the pump shown in FIG. 5, but the shape of the thin portions 8a and 8b of the diaphragm 8 constituting the pump chambers 7A and 7B is different from that of the pump shown in FIG. I do.

That is, in the pumps shown in FIGS. 5 and 6, the thin portion can move the piston, and the shape can be smoothly changed by this movement, and the change can be made at high pressure or low pressure. It has a U-shape in order to be able to withstand enough. However, in the case of the depressurization shown in FIG. 5, the pressure in the pump chamber becomes low on the contrary, and in consideration of preventing the entire diaphragm from being deformed by the suction force thereby, the thin U-shaped thin portion is desirable. Thus, FIG. 5 is inverted U-shaped, while FIG. 6 is U-shaped.

[0016]

As described above, in general, a diaphragm pump has a U-shaped thin portion deformed by the movement of a piston as shown in FIGS. Even when the pressure becomes high or low, the thin-walled portion is easily deformed, so that a smooth pumping operation is performed and the thin portion is not damaged.

As described above, when a series diaphragm pump is used for reducing the pressure, the pressure in the pump chamber connected to the suction port becomes small, and the pressure is lower than the pressure in the pump chamber connected to the discharge port. become. In addition, the pressure in the pump chamber connected to the discharge port is close to the pressure of the external fluid because it is directly discharged to the outside through the discharge port.

For example, when the pressure in the tank is reduced by drawing air in the tank by reducing the pressure as described above,
The suction port is connected to the tank, and the air in the tank is first sucked into the pump chamber connected to the suction port, and is sequentially discharged through the pump chamber to the outside from the pump chamber connected to the discharge port. Therefore, the pressure in the pump chamber connected to the suction port gradually decreases, but the pressure in the pump chamber connected to the discharge port is close to the outside.

When a series diaphragm pump is used to increase the pressure, the pressure in the pump chamber connected to the discharge port is increased to a higher pressure than the pressure in the pump chamber connected to the suction port. Moreover, an external fluid such as outside air flows directly into the pump chamber connected to the suction port and is sent to the next pump chamber. Therefore, the pressure in the pump chamber is close to the pressure of the external fluid. Since this fluid is sequentially pressurized and sent next, the pump chamber connected to the last outlet has the highest pressure.

In this manner, the pressure in the pump chamber connected to the discharge port becomes higher than the pressure in the pump chamber connected to the suction port. Further, as described above, the pressure of the pump chamber connected to the suction port is substantially the same as the pressure of the external fluid.

As described above, when the series diaphragm pump is used for increasing the pressure, the pressure of the pump chamber connected to the suction port is smaller than that of the other pump chambers, and is substantially equal to the external pressure. Pressure, and when used for depressurization, the pressure in the pump chamber connected to the outlet is high,
In addition, the pressure becomes almost equal to the external pressure.

As described above, in the case of using a series diaphragm pump for both increasing pressure and reducing pressure, a large pressure difference occurs between the pump chamber connected to the suction port and the pump chamber connected to the discharge port. .

Therefore, when the pump chambers having a large pressure difference in the series diaphragm pump have the same shape,
Whether it has a shape that is resistant to almost the same pressure as the pressure of the external fluid, or conversely, a shape that is resistant to a very high or low pressure than the external fluid, problems arise in durability and the like.

The present invention has been made in order to solve the above-mentioned drawbacks of the in-line diaphragm pump, and provides a diaphragm pump in which even if a pressure difference occurs in the pump chamber, breakage of the diaphragm portion, particularly the thin portion, does not occur. Things.

[0025]

A diaphragm pump according to the present invention includes a plurality of pump chambers including a pump chamber connected to a suction port and a pump chamber connected to a discharge port. The pump chamber connected to the suction port and the pump chamber connected to the discharge port are connected by a flow path or a room, or when there is a pump room in addition to both pump rooms, both pump rooms and other pump rooms between them Are connected in order from the pump chamber connected to the suction port to the pump chamber connected to the discharge port in a flow path or room, and the fluid is sucked from the suction port by the movement of the piston provided in each pump chamber and connected to the suction port. Pumps are pumped directly from the pump chamber to the discharge port connected to the discharge port or sequentially through each pump chamber, and discharged from the pump chamber connected to the discharge port through the discharge port. Pump having a diaphragm including a thin-walled portion and supporting a piston in a reciprocating manner so as to be easily deformed so that the volume can be changed by the movement of the ton so that the pumping action can be performed, and at least connected to the suction port It is characterized in that the thin portions of the pump chamber connected to the chamber and the discharge port have different shapes.

That is, the diaphragm pump of the present invention is a series diaphragm pump comprising two pump chambers or three or more pump chambers, that is, a plurality of pump chambers, which is used for reducing or increasing pressure. It is characterized in that the shape of the thin-walled portion of the pump chamber formed by the diaphragm is different from each other so as to be the most desirable shape with respect to the average pressure of each pump chamber during pump operation. .

In particular, when a series diaphragm pump such as the present invention is designed for pressure reduction, the pressure of each pump chamber during pump operation is lowest in the pump chamber connected to the suction port, Is relatively high and the highest among the pump chambers. When designed for pressure increase, the pressure in the pump chamber connected to the suction port is relatively low, and the pressure in the pump chamber connected to the discharge port is highest. In any case, the pressure difference between the pump chamber connected to the suction port and the pump chamber connected to the discharge port is largest. Therefore, it is desirable that at least the shape of the thin portion of the pump chamber connected to the suction port be different from the shape of the thin portion of the pump chamber connected to the discharge port. It is preferable that the shape of the thin portions of both the pump chambers be the most desirable shape at the time of pump operation.

A description will now be given of each of the two pump chambers for depressurization and pressure increase, and similarly, the one having three or more pump chambers for depressurization and pressure increase. .

First, the diaphragm pump of the present invention comprising two pump chambers has the following configuration.

That is, it has a first pump chamber connected to the suction port and another pump chamber (final pump chamber) connected to the discharge port, and both pump chambers are connected by a flow path or a room. The fluid from the tank or the outside of the pump flows into the first pump chamber from the suction port by the movement of the pistons provided in both pump chambers, and the fluid flows from the first pump chamber to the other pump chamber through the flow path. After feeding, reducing or increasing the pressure, it is discharged from the other last pump chamber through the discharge port to the outside of the pump or sent to a tank, etc., and the shape of the thin part of the first pump chamber and the other last thin part Is different from the shape.

When the pump of the present invention composed of the two pump chambers is used for reducing the pressure, the thin portion of the first pump chamber, which has a low pressure, has a shape resistant to extremely low pressure. The shape of the thin part of the last pump, which is the pump chamber connected to the discharge port that communicates with the outside, may be a flat shape that is the strongest against pressure close to the pressure of the external fluid. Most desirable. However, the shape of the thin part of this last pump chamber is flat (straight section).
Alternatively, a curved surface (cross-sectional curve) having a gentle curvature may be used.

In the case of a pump used for increasing the pressure, the most desirable shape of the thin portions of the first pump chamber and the last pump chamber is such that the first pump chamber is flat and the last pump chamber is flat. It is U-shaped. However, the first pump chamber
Any shape may be used as long as it is flat or close to it. For example, the cross-sectional shape may be a gentle curve instead of a straight line.

Next, the diaphragm pump of the present invention comprising three or more pump chambers has a first pump chamber connected to a suction port, and a second pump chamber connected to the first pump chamber by a flow path or a room. And a third pump chamber, which is the last pump chamber connected to the outlet and connected to the second pump chamber in the flow path or room (in the case of three pump chambers) or the first pump chamber connected to the suction port The pump chamber is composed of a second pump chamber, a third pump chamber, and a last pump chamber which are sequentially connected by a flow path or a chamber to the first pump chamber. The thin-walled portions of the pump chamber to be connected) and the last pump chamber (pump chamber connected to the discharge port) have different shapes.

The pump composed of the three pump chambers and designed for decompression has a thin portion of the diaphragm portion of the first pump chamber in an inverted U shape, and a thin portion of the diaphragm portion of the last pump chamber. It is desirable to have a flat or gentle curved surface.

With the above-described structure, the diaphragms constituting the respective pump chambers have high durability, similarly to the diaphragm pump including the two pump chambers.

In the case of a diaphragm pump having three or more pump chambers, the shape of the thin portion of the diaphragm in the pump chamber between the first pump chamber and the last pump chamber is U-shaped in the case of pressure increasing. It may be either flat or flat. Also, the first pump chamber may have a flat or curved surface with a gentle curvature, and the second, third,... Pump chambers may be sequentially increased in curvature, and the thin portion of the last pump chamber may be U-shaped. .

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a serial diaphragm pump comprising two pump chambers of the diaphragm pump according to the present invention will be described.

FIG. 1 shows the overall structure of a diaphragm pump according to the present invention, and FIG. 2 shows a main part thereof. The diaphragm (diaphragm part) in a pump in which two pumps (diaphragm parts) shown in FIG. 5 are connected in series is shown. And piston).

The diaphragm pump of this embodiment is
The configuration is the same as that shown in FIG. 5, where 6A and 6B are pistons, 7A and 7B are pump chambers, 8 is a diaphragm, 9
Is a suction port, 10 is a discharge port, 11, 12, 14, and 15 are check valves, and 13 is a passage.

As shown in FIG. 2B, the structure of the diaphragm 8 and the piston 6A constituting the first pump chamber 7A is the same as that of the conventional example as shown in FIG. (The thin portion 8a has an inverted U-shape.) The second pump chamber 7B has a thin portion 8b deformed by the reciprocating motion of the piston 6B as shown in the sectional view of FIG.
Are flat and have a linear cross section.

As described above, in the diaphragm pump according to this embodiment, the shape of the thin portion 8a or 8b of the diaphragm 8 constituting the pump chamber 7A connected to the suction port 9 and the pump chamber 7B connected to the discharge port 10 is different. It is characterized by having different shapes.

This pump is used for reducing the pressure. Therefore, the pressure in the pump chamber 7B connected to the discharge port 10 is higher than that in the pump chamber 7A connected to the suction port 9. That is, the suction port 9 is connected to a tank or the like, and the fluid is sucked into the pump chamber 7A from the tank or the like by a pump action, and after reducing the pressure, the fluid is sent to the pump chamber 7B and discharged from the discharge port. Therefore, the pressure in the pump chamber 7A is lower than that in the pump chamber 7B, and the pump chamber 7B is connected to the outside and has a pressure close to the external pressure.

Therefore, the pump chamber 7A has a thin portion 8a having an inverted U-shaped cross section which is a shape suitable for the pump chamber where the pressure is reduced, and the other pump chamber 7B is substantially the same as the external pressure. It has a relatively flat thin section suitable for pressure. That is, although FIGS. 1 and 2 show a flat shape (the cross section is a straight line), the shape may be a gently curved shape (a cross section is a curve having a gentle curvature).

With this configuration, the pump chamber connected to the suction port does not crack even at a pressure close to the external pressure, unlike the pump chamber connected to the discharge port.
Since the shape is suitable for the decompressed state, both pump chambers perform optimal movement, and the pump is durable.

In the pump shown in FIG. 1, the pump chamber 7A and the pump chamber 7B communicate with each other through a passage 13, but instead of such a passage, a room having a large space is formed. It suffices if there is a portion between the chamber and the chamber 7B where the fluid flows by connecting them. Then, the two pump chambers may be communicated with each other via a passage, the room, or the like, and check valves may be provided at the boundaries between the room and the pump chambers 7A and 7B. Further, the check valve may be provided on only one of the pump chamber 7A and the pump chamber 7B. Similarly, in the pump of FIG. 1 in which both pump chambers are connected by a passage, one of the check valves may be used without using the check valve 12 or the check valve 14.

In this embodiment, in the case of a series diaphragm pump comprising three or more pump chambers instead of two pump chambers, the pump chamber connected to the suction port is the pump chamber on the left side of FIG. If the pump chamber connected to the discharge port is shaped like the pump chamber on the right side of FIG. 2B, the other pump chambers between them are flat even if the thin part is inverted U-shaped. Or a shape having a gentle curved surface.

In the case of a pump comprising three or more pump chambers, the pump chamber connected to the suction port has an inverted U-shape, the degree of curvature is gradually reduced, and the thickness of the pump chamber connected to the discharge port is reduced. The portion may have the least curved or flattened shape.

FIG. 3 is a diagram showing another second embodiment. This embodiment is an example in which the present invention is applied to a diaphragm designed for increasing pressure in a series diaphragm pump having two pump chambers. That is, this is an embodiment in which the present invention is applied to the conventional diaphragm pump shown in FIG.

In this embodiment, similarly to the first embodiment, the thin portion 8a of the diaphragm in the pump chamber 7A and the thin portion 8b of the diaphragm in the pump chamber 7B have different shapes. However, unlike the first embodiment, the shape of the thin portion is such that the pump chamber 7A connected to the suction port is flat,
The pump chamber 7B connected to the outlet is U-shaped.

As shown in FIG. 6, a diaphragm pump used for increasing pressure is provided with a pump chamber 7A connected to a suction port.
Since the pressure is relatively close to the pressure of the external fluid, the thin portion 8a of the diaphragm 8 has a flat shape, and the pump chamber 7B connected to the discharge port is connected to a tank or the like, and the internal pressure is increased. In order to increase the pressure, the thin portion 8b of the diaphragm 8 has a U-shape.

Also in this embodiment, the pump chamber 7A
The thin-walled portion of the diaphragm may have a gentle curved shape instead of a flat shape.

In the case of a series diaphragm pump for increasing pressure as in the second embodiment, in the case of a pump comprising three or more pump chambers, the shape of the thin portion of the pump chamber connected to the suction port 3 as in the pump chamber 7A of FIG. 3 and the same shape as the thin portion of the pump chamber 7B connected to the discharge port, the shape of the thin portion of the pump chamber between the two pump chambers can be U-shaped or flat. Good.

In the case of a series diaphragm pump comprising three or more pump chambers for increasing the pressure, the pump chamber connected to the suction port has a flat or curved surface having a gentle curvature as shown in the pump chamber 7A of FIG. It is more preferable that the curvature of the pump chamber is gradually increased so that the pump chamber connected to the outlet is U-shaped.

According to the first and second embodiments described above, any pump chamber can be a diaphragm pump having excellent durability without fear of breakage such as cracks, even if it is a series pump.

Although the embodiment of the diaphragm pump of the present invention has been described above, a diaphragm pump having the following structure different from the above structure can also achieve the object of the present invention.

That is, this is a pump for reducing or increasing pressure, which is composed of a plurality of pump chambers. Each pump chamber has the same shape, and at least one of the pump chambers connected to the suction port is connected to the pump chamber. The pump chamber connected to the outlet is a pump chamber having a different diameter of the pump chamber or a pump chamber having a different diameter of the piston.

FIG. 4 shows a diaphragm in which the pump chamber connected to the suction port and the pump chamber connected to the discharge port have different diameters of the pump chamber or the piston so that the object of the present invention can be achieved. Show the pump.

In FIG. 4, (A) shows a diaphragm (pump chamber) and a piston portion of an in-line diaphragm pump composed of two decompression type pump chambers. The left pump chamber has a piston diameter of x1. Pump room diameter x2
In the pump chamber on the right side, the diameter of the piston is y1, and the diameter of the pump chamber is y2.

In FIG. 4A, the left pump chamber is connected to the suction port, the right pump chamber is connected to the discharge port, and the left pump chamber is connected to the left pump chamber through a suction port from a tank or the like. It is sent to the right pump chamber through the flow path,
The pressure is reduced in these pump chambers and supplied to a tank or the like from a discharge port. That is, the pressure in the pump chamber connected to the right outlet is higher than the pressure in the pump chamber connected to the left inlet, and the pressure in the pump chamber connected to the suction port is very low at least compared to the external pressure. The pressure in the pump chamber connected to the outlet is close to the external pressure.

In this case, for decompression, the diameter x1 of the pump chamber connected to the left suction port is made small, but the diameters y1 and y2 of the pistons are made equal, with a configuration as shown in FIG. 4A. That is, x1 <x2 and y1 = y2.

As a result, a good and durable pump without cracks or the like can be obtained.

Also, the diameter x1 of the left pump chamber and the diameter x2 of the right pump chamber are made equal to make x1 = x2, and the diameter y1 of the piston in the left pump chamber is made smaller than the diameter y2 of the piston in the right pump chamber. Y1> y2. That is, x1 = x2, y1> y2 may be satisfied.

In the case of a pressure reducing pump comprising three or more pump chambers, x1 <x2 <... <xn, and y1 = y2
= ... yn X1 <xn, y1 = y
.. = Yn, x2, x3.
And xn, and may be an equal value. Or x1 = x2 =... Xn and y1> yn, y
2, y3,... May be appropriate values between y1 and yn, and may be all equal.

When there are three or more pump chambers in the pressure-intensifying pump having the diaphragm and the piston shown in FIG. 4B, if x1>x2>x3>...> Xn, y1 = y2 = y
3 = ... = yn or x1 = x2 = x3 = ...
= Xn and y1 <y2 <y3 <... <Yn.

X1> xn, y1 = y2 =... =
, x2, x3,... are appropriately equal values between x1 and xn, or x1 = x2 =.
yn, and y2, y3,... may be appropriately equal values between y1 and yn.

Further, when this pump is used for increasing the pressure, the pump chamber on the left side is connected to the outside via the suction port and the pump chamber on the right side is connected to the tank via the discharge port in a configuration as shown in FIG. X1> x2 and y1 = y2
Or x1 = x2 and y1 <y2.

In this diaphragm pump, the diameter of the diaphragm section (pump chamber) is changed while the thin-walled section remains in a U-shaped cross section suitable for a pressure higher or lower than an external pressure such as an external pressure. By changing the diameter of the piston or by changing the diameter of the piston, a crack is not generated even in a pump chamber having a pressure substantially equal to the external pressure such as the outside air pressure, so that a diaphragm pump having excellent durability can be obtained.

The above-described pump in which the diameter of the pump chamber or the piston is changed has the same structure as that shown in FIG. 1 in the case of the pressure reducing type, and FIG. 3 in the case of the pressure increasing type. The configuration is the same as shown.

Also in these pumps, the connection between the pump chambers does not necessarily have to be a passage, that is, an elongated fluid passage, but may be a space (room) separately contacting both pump chambers. A check valve provided at a portion where a passage or a room contacts each pump chamber may be provided in each pump chamber, or may be provided in either one of the pump chambers.

[0070]

According to the diaphragm pump of the present invention, the pressure difference in each pump chamber is obtained by making the thin wall portion of the diaphragm part forming the pump chamber different or by changing the diameter of the pump chamber or the diameter of the piston. This has the effect that the pump can be made to be durable and hard to cause cracks in the pump chamber (diaphragm part) even in the in-line diaphragm pump where the above occurs.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a diaphragm pump of the present invention.

FIG. 2 is a diagram showing a configuration of a diaphragm portion which is a main portion of the diaphragm pump shown in FIG.

FIG. 3 is a diagram showing a configuration of another second embodiment of the diaphragm pump of the present invention.

FIG. 4 is a view for explaining another diaphragm pump which achieves the object of the present invention.

FIG. 5 is a diagram showing a configuration of a conventional series type diaphragm pump.

FIG. 6 is a diagram showing another configuration of a conventional in-line diaphragm pump.

[Explanation of symbols]

 6A, 6B Piston 7A, 7B Pump chamber 8 Diaphragm 8a, 8b Thin part 9 Inlet 10 Outlet

Claims (1)

[Claims] A pump chamber connected to a suction port and a pump chamber connected to a discharge port, wherein when two pump chambers are provided, a pump chamber connected to the suction port and the discharge port are provided. If the pump chamber is connected to the pump chamber by a flow path or a room, or if there is a pump chamber in addition to both pump chambers, the pump chamber and the other pump chamber between them are connected to the suction port through the discharge port. Pump chambers connected to the pump chambers sequentially connected to the pump chambers by a movement of a piston provided in each pump chamber, the fluid is sucked from the suction port through the suction port, and the pump chamber is connected from the pump chamber to the discharge port through the suction port. The pump is a series-type pump that is directly or sequentially sent through each pump chamber and discharged from the pump chamber connected to the discharge port through the discharge port. A diaphragm including a thin portion so as to be easily deformed and capable of supporting a piston in a reciprocating manner, and a thin portion of a pump chamber connected to at least a suction port and a pump chamber connected to a discharge port. A diaphragm pump characterized by having different shapes.