JPH11201045A - Bellows pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bellows pump provided with a check-valve using a valve element having excellent chemical resistance and durability for eliminating need of frequently replacing the check-valve. SOLUTION: In a bellows pump comprising bellows 5 having a drive part to change capacity, and check-valves 7 respectively disposed on the upstream side and the downstream side of a branch tube 6 communicated with the bellows 5 and branched to the upstream side and the downstream side for feeding fluid by opening/closing of the check valves 7 when the capacity is changed, a valve element 8 used in the check-valve is formed of elastic material in a roughly circular form, and it is set in an opened condition as it is elastically deformed, while it is set in a closed condition in a free condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows pump, and more particularly to a bellows pump having excellent durability and chemical resistance.

[0002]

2. Description of the Related Art The principle of operation of a bellows pump will be briefly described with reference to FIG.

In this figure, the bellows 5 has an upper end fixed to the ceiling of the base 1 in order to change the volume, and a connecting rod 3 is connected to a lower end 5a of the bellows 5 via a crank pin 4 so that The connecting rod 3 is connected by a crankpin 4 provided at a position eccentric from a disk 2a fixed to the output shaft of the motor 2 fixed on the bottom surface of the motor 1. With the above configuration, the bellows 5 changes so as to obtain a compressive and tensile force in the vertical direction shown by the solid line and the broken line as the motor 2 rotates, thereby changing its volume.

The bellows are provided with a flow path 6 branched to an upstream side and a downstream side, and a check valve 7 at an upstream side and a downstream side of the flow path 6, respectively, so that the volume of the bellows changes. The fluid is sent out to the downstream handle by opening and closing the valve bodies of the check valves 7 on the upstream side and the downstream side as shown by solid lines and broken lines.

FIG. 4 shows a valve element 10 used for a check valve.
8 is a cutaway view of a main part of a representative example of FIG. 8, in which a valve body 108 is formed of a rubber material and has a rod-shaped extending portion 108b extending from a vertex portion of a conical portion 108a, and an end portion of the extending portion 108b. When the valve body 108 is set with respect to the base 107 having the valve seat 110, the shape part 108c is gripped by a tool and pulled in the direction of the arrow to set the cylinder. The shape part 108c is assembled so that the shape part 108c protrudes and is locked at the end of the shape part 110b.

An opening 110a is formed between the valve seat 110 and the cylindrical portion 110b, and the valve body 108 is moved from the position shown by the solid line to the broken line so that the rod-shaped extension 108b having a free length L extends. By displacing to the position shown in the drawing, the fluid is caused to flow in the direction of the arrow by opening.

[0007]

According to the valve element constructed as described above, the assembling work for obtaining a finished product can be simplified, but the displacement for opening and closing the valve element 108 is reduced. It depends on the extension and contraction of the rod-shaped extending portion 108b.

On the other hand, since bellows pumps are used for sending various chemicals since the fluid is not exposed to air, they are required to have chemical resistance. Therefore, for example, when the valve element 108 formed of a rubber material as described above swells due to the chemical action of a chemical, the contraction amount of the rod-shaped extending portion 108b, that is, the valve closing force is deteriorated. As a result, the function of the check valve is significantly reduced, and the performance of the bellows pump is reduced.

Therefore, the check valve is frequently replaced depending on the degree of acidity or alkalinity or the type of chemical solution, or after a predetermined operation time has elapsed.

The bellows pump can supply a predetermined amount of liquid corresponding to the predetermined time by operating the bellows driving means for a predetermined time. Therefore, for example, it can be suitably used for feeding a processing solution used in a photo development processing apparatus. This is forced to be a problem in practical use.

Accordingly, the present invention has been made in view of the above-described problems, and the check valve is frequently replaced by providing a check valve using a valve body having excellent chemical resistance and durability. The purpose is to provide an unnecessary bellows pump.

[0012]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, according to the present invention, a bellows having a drive unit for changing a volume, a flow path communicating with the bellows and branching into an upstream side and a downstream side,
A bellows pump that arranges check valves on the upstream side and the downstream side, respectively, and that sends a fluid in a predetermined direction by opening and closing the check valves when the volume changes, and is used for the check valves. The valve body to be formed has a substantially disk shape made of an elastic body, and the check valve is opened in accordance with large elastic deformation and closed in other elastic deformations.

[0013] Further, a convex portion is extended from a central portion of the first disk surface of one surface of the valve body, and a hole portion for inserting the convex portion is provided around the hole portion. First with open opening
The check valve is formed from a base and a second base that includes the first base and has a contact surface that is opened according to elastic deformation of the second disk surface of the other surface of the valve body. It is characterized in that the upstream side and the downstream side are exchangeable.

[0014] The fluid is a processing liquid used in a photographic development processing apparatus, and the driving means is operated for a predetermined time so that a predetermined amount of the liquid is supplied according to the predetermined time. I have.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cutaway view of a main part of a bellows pump, in which a bellows driving unit for changing a volume is omitted. As the driving unit, for example, the one of the crank mechanism described with reference to FIG. 3 can be employed, but it is needless to say that the present invention is not limited to this, and various configurations are possible.

In FIG. 1, a bellows 5 is provided with a branch pipe 6 of a resin molded product which communicates with the bellows 5 and forms a flow path branched to an upstream side and a downstream side as shown in FIG. Base 1 made airtight by ring
Are fixed as shown.

An L-shaped tube 13 is provided on the upstream and downstream sides of the branch pipe 6 via an O-ring 12 as shown in FIG.
A check ring 7 is provided for each of the check valves 7, which is airtight by being fixed by the check valve 4. When the check valve 7 communicates with the flow path of the branch pipe 6, the volume of the bellows 5 changes. The check valve 7 is configured to be opened and closed by the positive pressure and the non-pressure action of the fluid so that the fluid is sent in the direction of the arrow in the drawing. The branch pipe 6 has a flow path formed therein as shown in the figure, and is configured so as to prevent reverse insertion of the cylindrical portion of the check valve 7 on the outlet side.

The valve element 8 used for the check valve 7 is
The check valve 7 is formed in a substantially disc shape from a rubber material or a silicone elastomer-based elastic body. The check valve 7 is opened by its elastic deformation, and is closed when it returns to its original state.

By forming the valve body 8 in such a disk shape, even if swelling occurs due to a chemical action of a chemical, the valve swelling swells as a whole, so that the valve closing force may deteriorate. Disappears. As a result, the check valve 7
The function of the bellows pump is not reduced, and the performance of the bellows pump is not reduced.

FIG. 2 is an exploded view of the check valve 7 shown in FIG.

Referring to FIG. 1 and FIG. 2 further, the structure of the check valve 7 will be described. The valve body 8 has a diameter of 5 to 20 mm, depending on the volume of the bellows pump and the physical properties of the elastic material used. The thickness is set to be more than that, and the thickness of the disk portion is also set appropriately from 0.3 mm to 3 mm or more. The one shown in FIG. 1 is close to the actual size.

In FIG. 2, a protrusion 8a having a height of about 5 mm and a diameter of about 2 mm extends from the center of the first disk surface 8b on one surface of the valve body 8. . The hole 10b for inserting the convex portion 8a and the opening 10a closed by the first disk surface 8b due to the elastic deformation of the disk of the valve body 8 are formed by the above holes. In order to radially provide around the part 10b, the first base part 10 integrally formed with a plurality of spoke parts 10c is injection-molded from a predetermined chemical-resistant resin material (polypropylene or the like) so as to have a shape as shown in the drawing. .

The first base 10 is formed as a hat-shaped body as shown in FIG.
In the opposing region, a protruding portion 10h is integrally formed at the distal end, and an elastically deforming piece is provided.
The protrusion 10h is fitted into the hole 11a after the insertion, so that it can be completed. In addition, the above outer peripheral surface 1
A flange portion 10f is formed integrally with the edge of Od, and the flange portion 10f abuts on the edge portion so as to restrict the movement thereof and fix it at a predetermined position.

On the other hand, the second disk surface 8c on the other surface of the valve body 8
A cylindrical second base 1 having a contact surface 11c that is opened due to elastic deformation of the first base 10 and having the first base 10 built therein.
1, after attaching the valve body 8 to the first base 10 described above,
The hole 1 in which the protrusion 10h infiltrates and snaps into place.
A pair of holes 1a are formed in the opposing surfaces so that the assembling operation can be performed without using a tool or the like.

A flange 11f for holding the O-ring 12 in a pressed state in FIG. 1 and a cylindrical portion 11b communicating with the contact surface 11c are provided on the outer peripheral surface of the second base 11.
Are integrally formed using a predetermined resin material.

The check valve 7 completed as described above
Are prepared and assembled to the bellows pump as shown in FIG. After that, even if the elastic force of the valve body 8 deteriorates due to the degree of acidity or alkalinity after a predetermined time has elapsed, the disk of the valve body 8 is actuated by the positive and negative pressures of the fluid as described above. Since the shape-like portion can be displaced, it can be used as it is even if deterioration progresses. As a result, it is not necessary to frequently exchange the check valve as in the related art, and it can be particularly suitably used for feeding the processing liquid used in the photographic processing apparatus.

Further, the bellows pump controls only the energization time to operate the bellows drive unit for a predetermined time,
A predetermined amount of liquid can be sent according to a predetermined time, and control can be simplified.

According to the above-described embodiment, the case where two identical check valves 7 are prepared has been described. However, only one of them may be provided. It can also be incorporated without providing.

The specific configuration of the check ring 7 is not limited to the above-described configuration, and various configurations are possible as long as the valve body 8 is formed in a disk shape and this portion is opened and closed. Needless to say, there is.

[0031]

As described above, according to the present invention,
By providing a check valve using a valve body having excellent chemical resistance and durability, it is possible to provide a bellows pump that does not require frequent replacement of the check valve.

[0032]

[Brief description of the drawings]

FIG. 1 is a fragmentary cutaway view of a bellows pump.

FIG. 2 is a three-dimensional exploded view of the check ring.

FIG. 3 is a schematic configuration diagram of a conventional bellows pump.

FIG. 4 is a fragmentary cutaway view of a valve body of a conventional check valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 6 Branch pipe 7 Check valve 8 Valve body 10 1st base 11 2nd base

Claims (3)

[Claims] 1. A bellows having a driving means for changing a volume, a flow path communicating with the bellows and branching into an upstream side and a downstream side, and a check valve on the upstream side and the downstream side. A bellows pump which is disposed respectively and sends out a fluid in a predetermined direction by opening and closing the check ring when the volume changes, wherein a valve element used for the check ring is a substantially circular elastic body. A bellows pump having a plate shape, wherein the check valve is opened with large elastic deformation and closed with other elastic deformation. 2. A protruding portion extending from a central portion of one surface of the first disc surface of the valve body, and a hole for inserting the protruding portion, and a hole disposed around the hole. A first base having an opening formed therein, and a second base including the first base and having a contact surface that is opened due to elastic deformation of a second disk surface of the other surface of the valve body. 2. The bellows pump according to claim 1, wherein the check valve is configured from the above and the upstream side and the downstream side are replaceable. 3. 3. The method according to claim 1, wherein the fluid is a processing liquid used in a photographic processing apparatus, and the driving means is driven for a predetermined time to send a predetermined amount of liquid according to the predetermined time. The bellows pump according to claim 1 or 2, wherein