JPH0367075A - Diaphragm pump - Google Patents

Abstract

PURPOSE:To miniaturize the diaphragm pump and prevent inclusion of foreign matters in the main fluid by leading a pair of pressurization chambers to a suction and an outlet port for the main fluid via an inlet and an outlet check valve, and coupling a pair of diaphragms in such a way as capable of displacement in a single piece through a coupling element detouring the pressurization chambers. CONSTITUTION:A pair of pressurization chambers 8a, 8b are put in communication with a suction port 14 and a discharge port 15 for main fluid, respectively, via inlet check valves 12a, 12b admitting only influx furnished within a bulkhead 5a and outlet check valves 13a, 13b admitting only outflow, while a pair of diaphragms 7a, 7b are coupled by a belt 3 detouring the mentioned pressurization chambers 8a, 8b in such a way as displaceable in a single piece. Therein it is not required to provided any manufold for supply and exhaust of the main fluid on both sides of the pump body, so that the pump can be embodied in a small size. Further, the pressurization chambers 8a, 8b are free of sliding parts, which should prevent inclusion of foreign matters into the main fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a diaphragm pump driven by fluid pressure.

[Prior Art] Conventionally, a diaphragm-type bomb driven by fluid pressure has diaphragms attached to both ends of a rod that passes through a partition wall, and the diaphragms are moved to the outside of a pair of diaphragms to create a pressurizing chamber that pressurizes a main flow. A drive chamber is provided inside the diaphragm.

However, if the pressurizing chamber is provided outside the pair of diaphragms, it is necessary to provide manifolds on both sides of the pump body for supplying and discharging the main fluid to the pressurizing chamber, resulting in a large pump. There is.

In order to solve this problem, a diaphragm type pump in which the inside of a pair of diaphragms is used as a pressurizing chamber and the outside is used as a driving chamber is proposed in Japanese Utility Model Application Publication No. 137183/1983.

The previously proposed pumps have a pressurizing chamber inside the pair of diaphragms, which makes it possible to make the pump more compact.Also, since the lot is located on the pressurizing chamber side, which penetrates the partition, the sliding part of the lot is There is a risk that lubricating oil applied to the sealing member that seals the main flow may mix into the main flow.

However, if foreign substances such as medicines or foods are mixed together,
A new problem arises in that it cannot be used for fluids that can cause product defects even if the amount is small.

[Problems to be Solved by the Invention] The object of the present invention is to provide a diaphragm pump which is small in size and free from the possibility of foreign matter being mixed into the main fluid.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a partition wall and a cover inside the partition wall, a pair of pressurizing chambers inside a diaphragm partitioned by a pair of diaphragms between the partition wall and the cover, and a pressure chamber outside the partition wall. In a diaphragm type pump equipped with a pair of drive chambers and a directional control valve that displaces a diaphragm by supplying and discharging drive fluid to and from the pair of drive chambers, the pair of pressurizing chambers are provided within a partition wall. Through an inlet check valve that only allows fluid to flow in and an outlet check valve that only allows fluid to flow out,
+: A fluid suction port and a fluid discharge port are connected to each other, and the pair of diaphragms are connected so as to be integrally displaceable by a connecting body that bypasses the pressurizing chamber.

[Function] A pressurized chamber is provided inside a pair of diaphragms, and
These pressurized chambers are connected to the suction port and discharge port of the main fluid through an inlet check valve that only allows fluid to flow in and an outlet check valve that only allows fluid to flow out, which are installed in the partition wall, so that the pump Since there is no need to provide a manifold for supplying and discharging the main fluid on the high side of the main body, the pump can be made smaller.

Further, since the pair of diaphragms are connected so as to be integrally displaceable by a connecting body that bypasses the pressurizing chamber, there is no sliding part on the pressurizing chamber side, so that it is possible to prevent foreign matter from entering the main fluid.

[Example] 1 to 4 show embodiments of the present invention.

This diaphragm type pump consists of a pump body 1. It is provided with a directional switching valve 2 for supplying and discharging a driving fluid to and from a driving chamber (described later) of the bong body 1, and a belt 3 as a connecting body that integrally displaces a pair of diaphragms (described later).

The pump body 1 includes a body 5 and covers 6a and 6b that cover both sides of the body 5, and diaphragms 7a and 7b whose peripheries are sandwiched between the covers 6a and 6b and the partition wall 5a of the body 5. Pressurizing chamber 8a inside the diaphragm,
It is divided into 8b and outer drive chambers 9a and 9t+,
7Jn Pressure chambers 8a and 8b are provided with inlet check valves 12a and 12b that allow only fluid to flow into the pressure chambers 8a and 8b provided in the partition wall Sa, and outlets that only allow fluid to flow out from the pressure chambers. It communicates with a suction port 14 and a discharge port 15 of the main fluid through check valves 13a and 13b, respectively.

The center portions of the diaphragms 7a, 7b are tightly sandwiched between an inner disk 17 on the pressure chamber side and an outer disk 18 on the drive chamber side, and pass through the outer disks 18, 18 to the drive chambers 9a, 9b side. Projecting inner disc 17.17
A fitting recess 17a for attaching the belt 3 to the tip of the
, 17a is formed.

A pilot chamber 2a, which will be described later, of the directional control valve 2.

Pilot valve 2 for supplying and discharging pilot fluid to 2b
0a and 20b are installed in the cabinets 6a and 6b, and are a driving fluid (compressed air) supply port P and a pilot flow path 21a.
, 21b to pilot rooms 2a, 2! ＞ Pilot ports PA and PR that communicate with ＞, and discharge port R that communicates with the outside. : At the end of the displacement of the diaphragms 7a, 7b, the outer disk J8.18 is connected to the bushing rod 22.
When a and 22b are pressed, ports P and PA and PR are connected, and when the pressing force of push rods 22a and 22b is released, ports P^, PB and R are connected due to the urging force of return springs 23a and 23b. It is composed of a well-known three-port valve (see Fig. 3A and B).

On the other hand, the directional switching valve 2 whose details are shown in Fig. Pilot channel 2 on both sides
The pilot chambers 2a and 2b have openings 1a and 21b.
, and a detent mechanism 25 and a manual operation mechanism 26 for the spool 24, and when pilot fluid is supplied to the pilot chamber 2a, ports P and A and B and RB communicate with each other, and the detent mechanism 25 maintains this switching position. ,
When the pilot fluid is supplied to the pilot chamber 2b, the detent mechanism 25 eliminates the detent and the port P
B and A communicate with RA, and when the manual operation mechanism 26 is pressed, ports P communicate with A and B) IB, and output ports A and B communicate with the supply flow path 27a.
, 27b communicate with the drive chambers 9a, 9b.

The belt 3 shown in FIG. 2 is made of a material with little elasticity, and has fitting protrusions 30 and 30 at both ends that are fitted and fixed into the fitting recesses 17a and 17t), and has drive chambers 9a and 9b.
The both side parts 31.31 that slide inside have a circular cross section for convenience of sealing, and are provided with belt grooves 32 formed in the pump body l.
An intermediate portion 33 passing through the pump body is formed to have a flat cross-section, and is moved by rollers 34° provided on the covers 6a and 6b.
It is supported so that it can slide freely.

Reference numeral 35 in FIG. 1 indicates the drive chambers 9a, 9b and the belt groove 3.
This is a sealing member that seals between the two.

The first UA is a pair of diaphragms 7a and 7b connected by a belt 3 by the driving fluid supplied to the driving chamber 9b.
is at the rightward displacement end in the figure, and presses the outer disk 18 or the bushing rod 22a of the pilot valve 20a,
The directional control valve 2 is shown in a state in which ports P and A and B and RB communicate with each other by pilot fluid supplied to the pilot chamber 2a.

Therefore, the diaphragms 7a and 7b are moved to the left in the figure by the propellant supplied to the drive chamber 9a.

The main fluid that has been sucked into the pressurizing chamber 8a passes through the outlet check valve 13a and flows out from the discharge port 11, and the main fluid passes through the suction port 14 and the inlet check valve 12b and flows into the pressurizing chamber 8b. is inhaled. In this case, the leftward displacement of the diaphragms 7a and 7b causes the Butschlot 2
2a is released, the pilot valve 20a is switched to a position where ports PA and R communicate with each other, and the pilot fluid in the pilot chamber 2a is discharged to the outside, or this switching position is maintained by the detent mechanism 25. ing.

When the diaphragms 7a and 7b press the bushing rod 22b at the leftward displacement end in the figure, the pilot valve 2
Since ports P and RB of 0b communicate with each other and pilot fluid is supplied to the pilot chamber 2b, the directional control valve 2 is switched to a position where ports P and B and A and AR communicate with each other, and the drive chambers 9b4. : The diaphragm 7a is supplied with driving fluid;
7b is displaced to the right in the figure. diaphragm 7a,
What is the operation when 7b is displaced to the right?

Since this is substantially the same as the case of leftward movement, detailed explanation will be omitted.

In the above embodiment, the diaphragms 7a, 7b are connected so as to be integrally displaceable by the belt 3 passing through the drive chambers 9a, 9b and the belt groove 32, bypassing the pressurizing chambers 8a, 8b. Since there are no sliding parts, it is possible to pressurize liquids that do not want to be contaminated by foreign substances, such as medical solutions or foods.

In addition, the pressurizing chambers 8a and 8b are connected to diaphragms 7a and 7b.
Since it is installed inside the pump body, there is no need to provide a manifold etc. for supplying and discharging the main fluid on the outside of the pump body l.
In addition to reducing the size of the pump, since there is no rod passing through the gap 95a, each check valve is separated by a gap @5a.
Since they can be installed all together in the center of the pump body 1, it is possible to reduce the height of the pump body 1.

In addition, in the above embodiment, the directional control valve 2 is used for convenience of explanation.
Although the directional control valve 2 is installed outside the pump body 1, it is also possible to assemble the directional control valve 2 in the pump body 1 and form the supply channels 27a, 27b and the pilot channels 21a, 21b in the pump body 1. Of course.

[Effects of the Invention] The diaphragm pump of the present invention has the inner side of the pair of diaphragms as the pressurizing chamber for the main fluid, and the outside as the driving chamber for supplying and discharging the driving fluid. There is no need to install a manifold etc. on the outside of the pump body.
The pump body can be made smaller.

In addition, since the pair of diaphragms are connected by a connecting member that bypasses the pressurizing chamber, there is no sliding part in both pressurizing chambers inside the diaphragm, so it can be used for fluids that do not want to be contaminated with foreign substances such as chemical solutions or foods. Wear.

Furthermore, since there is no lot that penetrates the bulkhead, the height of the pump can be reduced by installing the inlet check valve and the outlet check valve in the center of the bulkhead.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of a connecting member, Fig. 3 A and B are configuration diagrams of a pilot valve, and Fig. 4 is a perspective view of a connecting member.
The figure is an enlarged sectional view of the directional control valve. 2 - Directional switching valve, 3 - Belt, 5a... bulkhead, 6a, 5b... cover 7a,
7b - Diaphragm, 8a, 8b - Pressure chamber, 9a, 9b - Drive chamber, 12a, 1.2b - Inlet check valve, 13a,
13b...Outlet check valve, 14...Suction port, 15...Discharge port. Figure 1

Claims (1)

[Claims] 1. A partition wall and covers on both sides thereof, a pair of pressurizing chambers inside the diaphragm and a pair of driving chambers outside the diaphragm, which are partitioned by a pair of diaphragms between the partition wall and the cover, and the pair of driving chambers. In a diaphragm type pump equipped with a directional control valve that displaces a pair of diaphragms by supplying and discharging driving fluid to the pump, the pair of pressurized chambers is connected to an inlet check valve provided in a partition wall that only allows fluid to flow in. The pair of diaphragms are connected to a suction port and a discharge port of the main fluid through an outlet check valve that only allows fluid to flow out.
A diaphragm pump characterized in that the pump is connected so as to be integrally displaceable by a connecting body that bypasses the pressurizing chamber.