JP2575756Y2 - Bellows pump for high temperature liquid transfer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows pump for transferring a high-temperature liquid.

[0002]

2. Description of the Related Art Bellows pumps for transferring liquids are known as liquid pumps suitable for transferring high-purity liquids in the fields of medicine, semiconductors, biotechnology and the like. Widely used from.

FIG. 6 shows an essential structure of an example of a conventional bellows pump. Bellows pump 6 in the same figure
Reference numeral 1 denotes a pump case 64 having a chamber 63 provided with an entrance 62 through which a liquid (not shown) flows in and out, a bellows 65 provided as a part of the chamber 63, and a bellows 65.
The gas is intermittently sent into the cylinder case 66 through the cylinder case 66 in which the bellows 65 are disposed, and the bellows 65 is extended and contracted, and the suction and discharge of the liquid into the chamber 63 are performed by the extension and contraction. And a driving means for Then, a rubber plate 69 is interposed between the end plate 68 and the pump case 64 between the end plate 68 and the cylinder case 66 attached to the outside of the pump case 64, and between the end case 68 and the cylinder case 66. The flange 65a of the bellows 65 and the cylinder packing 70 are sandwiched and tightened (for example, the tightening torque is about 50 kg-cm) with four bolts 71 to make the bellows 65 adhere.

[0004]

In the conventional bellows pump, there is a case where the temperature of a sample (liquid) sucked and discharged by the pump is as high as 80 to 180 ° C. The pump case 64 is made of a resin having a large coefficient of thermal expansion such as PFA (ethylene tetrafluoride / hydrofluoroalkyl vinyl ether) or PTFE (tetrafluoroethylene resin) because of chemical resistance.
10 to 20 × 10 when using FA or PTFE
^{Expands by} about ^-5 / ° C.

Therefore, when the pump case 64 thermally expands, the gap between the pump case 64 and the end plate 68 is narrowed, and the rubber plate 69 interposed therebetween is crushed, as shown in FIG. 69 protrudes from between the pump case 64 and the end plate 68, and
If the thermal expansion of 4 disappears, it will return to its original state,
That operation will be repeated.

However, while the rubber plate 69 has sufficient resilience, it is good, but if the rubber plate 69 is fatigued by long-term use, in this state, if the protrusion continues for a long time, permanent deformation occurs. As shown by reference numeral 69a in FIG. 7, the original state is not restored, and the tightening torque is reduced (10 kg in the previous example).
−cm or less). In addition, when the liquid is a chemical other than pure water, the outside air environment is deteriorated, and the rubber plate 69 is easily corroded. If the rubber plate 69 is permanently deformed, the sealing pressure between the pump case 64, the bellows 65, and the cylinder case 66 becomes small, causing a problem such as liquid leakage. In order to prevent this liquid leakage, the rubber plate 69 must be replaced frequently.
Such maintenance work lowers the operating rate and is uneconomical.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bellows pump for transferring a high-temperature liquid capable of improving the operation rate and reliability by solving the above-mentioned problems simply and by maintaining a constant sealing property for a long period of time. Is to provide.

[0008]

In order to achieve the above object, the present invention has a top wall portion protruding from a main body portion,
Forming a recess in the portion, and leading to the main body portion from within the recess
A pump case with an inlet / outlet for liquid and one end opened,
The mounting flange provided around the opening is
The pump chamber is formed together with the recess by closely contacting the end face of
The bellows to be formed and the upper opening where the bellows are arranged
Comprising a mouth the cylinder case, and a driving means for by applying a stretching operation in the bellows made emissions and the suction of the liquid into the pump chamber, a flange portion of said bellows
Open the cylinder end with the concave end face of the top wall.
An end plate is abutted on the outer surface of the top wall portion in a state of being sandwiched between the end plate side and the end plate side.
Tightening with multiple bolts on the undercase side
According to the bellows pump in which the space between the top wall and the bellows is sealed, the end plate is
Divide in the horizontal direction, and pair the divided end plates.
Recesses are provided on the opposite surfaces, and compression springs are interposed in the recesses.
By doing so, the tightness between the top wall and the bellows
The gist is to keep the strength constant .

[0009]

According to the above arrangement, when the pump case changes due to thermal expansion, the change is absorbed by the compression spring, and the pressure applied between the pump case and the bellows can be kept almost always constant. This makes it possible to maintain a constant sealing property over a long period of time.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show an embodiment of a bellows pump to which the present invention is applied.
Reference numeral 0 denotes cylinder cases 13 and 14 in which the bellows 11 and 12 are housed independently in the vertical direction, and rods 15 and 16 fixed to the lower ends of the bellows 11 and 12 through the bottoms of the cylinder cases 13 and 14. And cylinder case 1
Gas pressure feeding means 18 for alternately sending compressed gas through valve switching unit 17 and actuating means 19 operated in conjunction with up and down movement of rods 15 and 16 are provided in 3 and 14. The driving means is constituted by the gas pressure feeding means 18 and the operating means 19.

The bellows 11 and 12 are made of a plastic material such as fluororesin, which has excellent heat and corrosion resistance, and has a predetermined internal volume. In addition, bellows 1
The upper ends of the first and second openings are opened, and a flange portion 12A is formed around the opening in a single body. In addition, on the upper surface of the flange portion 12A, a convex ridge wall 12B is also provided so as to circulate, and on the lower surface, a step portion 12C for closely contacting and positioning the cylinder packing 9 is provided (FIG. 5). reference). On the other hand, plate materials 11a and 12a are attached to lower ends of the bellows 11 and 12 in a sealable manner. The tips of the rods 15, 16 are fixed to the center of the lower surface of the plate members 11a, 12a.

The cylinder cases 13 and 14 are positioned vertically on the housing 8 and are provided side by side. The stay 20 is fixed between the lower portions of the cylinder cases 13 and 14. A rod 1 is provided at the bottom of the cylinder cases 13 and 14.
Bearings 21 and 22 are provided for guiding the bearings 5 and 16 to the outside of the cylinder cases 13 and 14.
The seal member 2 is provided inside the cylinder cases 13 and 14 of FIG.
3, 24 are mounted. The lower ends of the rods 15 and 16 are projected outside through the seal members 23 and 24 and the bearings 21 and 22. The upper portions of the cylinder cases 13 and 14 are open. The lower surfaces of the flanges 12A of the bellows 11, 12 inserted from above into the cylinder cases 13, 14 are in contact with the opening ends via the cylinder packing 9.

The pump cases 1 and 2 are made of, for example, PTFE (tetrafluoroethylene resin) or the like for chemical resistance, and have main bodies 1A and 2A and project from the main bodies 1A and 2A at substantially right angles. The provided ceiling walls 1B and 2B are integrally formed.

The top walls 1B and 2B are larger than the upper surfaces of the cylinder cases 13 and 14, and the lower surfaces thereof are provided with concave portions 3 into which the upper ends of the cylinder cases 13 and 14 are inserted and positioned. In the recess 3, the convex walls 12 B corresponding to the convex walls 12 B of the bellows 11 and 12 are provided.
A groove 4 (refer to FIG. 5) into which is sealable is formed. Further, a recess 6 for forming the pump chamber 5 together with the bellows 11 and 12 in the central portion is formed in the recess 3.
Are formed in the recess 6, and an inlet / outlet 25 is provided in the recess 6 to communicate with the liquid flow passage 7 in the main bodies 1 </ b> A and 2 </ b> A.

A pipe 51 having a suction port 50 for sucking liquid and a pipe 53 having a discharge port 52 for discharging liquid are attached to the other end of the liquid flow passage 7. Check valves 27 and 28 are provided between the suction port 50 and the liquid flow path 7 and between the discharge port 52 and the liquid flow path 7. In a certain direction.

On the other hand, the top walls 1B of the pump cases 1 and 2
On the upper surface of 2B, two end plates 54 and 55 are stacked and arranged. Each end plate 54, 55
Each of the corners has a mounting hole (not shown) into which a total of four fastening bolts 56 are inserted, one for each corner, and each of the opposing surfaces has four holes. Spring positioning recesses 5
Numerals 7 and 58 are provided so as to face each other, and a coil spring 59 is positioned between the spring positioning recesses 57 and 58 and compressed and interposed therebetween.

In this pump portion, bellows 11, 12 with cylinder packing 9 mounted on lower step 12C of flange 12A are inserted into cylinder cases 13, 14 from above, and the lower surface of flange 12A is fitted with cylinder packing 9 The top walls 1B and 2B of the pump cases 1 and 2 are inserted in such a manner that the upper portions of the cylinder cases 13 and 14 are further inserted into the recesses 3 in a state of contacting the upper ends of the cylinder cases 13 and 14 via Cylinder case 13,
Cover from the top of 14. Then, the convex wall 12B of the flange portion 12A is inserted into the groove 4 in the concave portion 3, and
The cylinder cases 13, 14 and the ceiling walls 1B, 2B are combined in a sealed state.

Next, the coil springs 59 as compression springs are respectively arranged between the recesses 57, 58 and the end plates 54, 55, and the end plates 54, 55 are attached to the top wall 1B, Placed on 2B,
Thereafter, the fastening bolt 56 is inserted to fasten the space between the end plate 55 and the housing 8. Then, the tightening force is applied between the pump cases 1 and 2 and the cylinder cases 13 and 14 via the coil spring 59 between the end plates 54 and 55. When the gap is 2 mm, the compression spring pressure is 13 mm.
The pressure is set to about 0 to 150 kg ^- cm, and if it exceeds this size, the coil spring 59 is compressed and absorbed, so that almost constant force is always applied to the cylinder cases 13 and 14 and the top walls 1B and 2B. Will be granted between Further, even if the pump cases 1 and 2 expand thermally, this expansion is absorbed by the contraction of the coil spring 59 and has a significant effect on the force applied between the cylinder cases 13 and 14 and the top wall portions 1B and 2B. No effect is exerted, and the same coil spring (compression spring) 59 can be used to maintain a constant sealing property for a long period of time.

Next, the gas pressure feeding means 18 is provided with a valve switching portion 17 to which compressed gas from the compressor is introduced, and pipes 29 and 30 for independently communicating between the inside of the valve switching portion 17 and the inside of the cylinder cases 13 and 14. , Compressed gas is pipe 2
Three valve members 3 to be fed alternately to 9, 30
1, 32, and 33.

The valve switching section 17 has ends of pipes 29 and 30 connected to the upper surface of the case body, and a gas inlet 34 at the lower center of the case body and substantially at the center thereof. Gas outlets 35 and 36 are provided on both sides of the gas inlet 34. The position of the gas inlet 34 is set so as to be directly below the middle of the connection between the pipes 29 and 30, and the position of the gas outlets 35 and 36 is located across the connection of the pipes 29 and 30. It is set to be on both the left and right sides. In addition, valve 3
Reference numerals 1, 32, and 33 are formed to have a size close to the inner surface of the case main body, and are coaxially mounted on the shaft 37 at predetermined intervals. The shaft 37 is slidably mounted on both sides of the case main body, and both ends protrude to the outside of the case main body.

The valve switching section 17 is connected to a shaft 37.
Is moved to the right in FIG.
32 and 33 also move in the main body case in conjunction with each other to form a flow path between the gas inlet 34 and the pipe 29 shown in FIG. 1 and simultaneously form a flow path between the gas outlet 36 and the pipe 30. Also, the valve switching unit 17 is configured such that
By moving to the left inside, the valves 31, 32,
33 also moves in the case body in conjunction with the gas inlet 34.
And a gas outlet 3
5 and a pipe 29 are formed.
Further, the extended ends of the pipes 29 and 30 penetrate the bottoms of the cylinder cases 13 and 14 in a sealable manner, and are guided into the cylinder cases 13 and 14.

Therefore, in the gas pressure feeding means 18,
The compressed gas in the cylinder cases 13 and 14 is alternately exhausted through the pipes 29 and 30 while the compressed gas is alternately sent to the pipes 29 and 30 by the valve switching unit 17. The actuating means 19 of the present invention includes a drum 38 and a belt 39 having a circular shape. this house,
The drum 38 is rotatably supported by a stay 20 fixed between lower portions of the cylinder cases 13 and 14. On the other hand, as the belt 39, a stainless steel flat belt or the like is used, and the belt
5 and 16 are fixed to the lower ends.

In this structure, when one of the rods 15 and 16 is raised, the drum 38 is rotated by the movement of the belt 39, and the other rod is lowered. That is, when the compressed gas is sent to one of the cylinder cases 13 and 14 and operates in a direction in which the bellows is contracted, the bellows in the other cylinder case are operated in conjunction with the direction in which the bellows in the other cylinder case are extended by the drum 38 and the belt 39. I do.

The actuating means 19 of this embodiment is provided with an arm 40 which is provided at the center of rotation of the drum 38 and is substantially straight and hung down, and a lower end of the arm 40 is fitted to one end thereof. In addition, a sliding body 41 that is moved in the horizontal direction by the swing of the drum 38 and a switching lever 42 that selectively presses one of both ends of the shaft 37 depending on the moving direction of the sliding body 41 are provided.

The sliding member 41 has an L-shaped cross section. L
The U-shaped vertical portion has a U-shaped portion 41 a formed at an end thereof, and is closely fitted to a roller 40 a provided at a lower end of the arm 40. The L-shaped horizontal portion is movably held by a bearing 43, and its end is connected to a switching lever 42. The switching lever 42 is formed in a U-shape.
The valve switching portion 17 is sandwiched from above in the U-shaped opening. Pressing members 44 and 45 are formed at right angles at both ends of the U-shape.
, And the shaft 37 is located coaxially with the pressing members 44 and 45. The pressing members 44 and 45 are
Their heads are disposed with opposite ends and a predetermined gap of the shaft 37, so that pressing any end of the shaft 37 by the movement direction of the slide 4 1. And
In the valve switching section 17, the pipes 29 and 30 communicating with the gas inlet 34 are determined according to the direction in which the shaft 37 is pushed, and the pipes 29 and 30 communicating with the gas outlets 35 and 36 are also determined.

Therefore, the operating means 19 uses the movements of the rods 15, 16 connected by the drum 38 and the belt 39 to operate the valves 31, 32, 3 of the valve switching section 17.
3 is operated, the amount of compressed gas sent to the cylinder cases 13 and 14 and the suction and discharge forces of the liquid due to the expansion and contraction of the bellows 11 and 12 surely correspond to each other, so that the liquid can be transferred more quantitatively. it can.

In the above embodiment, the cylinder case 1
Although the structure in which the vertical and horizontal lines 3 and 14 are provided has been disclosed, the present invention is not limited to this and can be similarly applied to a structure where they are linearly arranged side by side on the same axis.

[0028]

As described above, in the bellows pump according to the present invention, when the pump case changes due to thermal expansion, the change is absorbed by the compression spring, and the space between the top wall portion of the pump case and the bellows. Can be maintained substantially constant, and a constant sealing property can be maintained over a long period of time, so that the operation rate and the reliability of the apparatus can be greatly improved. In addition, since the compression spring is arranged in the recess at the time of assembling, positioning is easy and the spring pressure in the design can be reliably applied. In addition, in the assembling state, it is hardly affected by outside air and is excellent in corrosion prevention measures. . Only
However , according to the present invention, the end plate and the compression spring are unitized, and the compression spring having a predetermined spring pressure is selected, so that the present invention can be easily applied, and the sealing property can be surely improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a main configuration of a bellows pump to which the present invention is applied.

FIG. 2 is a front view of the bellows pump to which the present invention is applied.

FIG. 3 is a side view of the bellows pump to which the present invention is applied.

FIG. 4 is a main part top view as seen from the direction of the line AA in FIG. 3;

FIG. 5 is an enlarged view of a portion B in FIG. 1;

FIG. 6 is a diagram showing a main part structure of an example of a conventional bellows pump.

FIG. 7 is a view for explaining a problem of the conventional bellows pump shown in FIG.

[Explanation of symbols]

1, 2 pump case 1B, 2B top wall portion 3, 6 of pump case 5 recess in top wall 5 pump chamber 11, 12 bellows 12A flange portion 13, 14 of bellows cylinder case 25 liquid inlet / outlet port 54, 55 end plate 56 Bolt 57, 58 Recess 59 Coil spring (compression spring)

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A 4-32279 (JP, U) JP-A 58-18379 (JP, U) JP-A 57-202051 (JP, U) JP 48- 40168 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04B 43/08 F04B 43/10 F04B 53/00

Claims (1)

(57) [Scope of request for utility model registration] A top wall portion protruding from a main body portion;
A recess is formed in the wall, and the inside of the recess communicates with the main body.
Pump case provided with a liquid inlet / outlet, and a mounting franc opened at one end and provided around the opening.
The flange portion is in close contact with the end face of the
A bellows forming a pump chamber, a cylinder case having an upper opening in which the bellows are arranged, and a drive means for imparting expansion and contraction operation to the bellows to suck and discharge liquid into and from the pump chamber. And the flange portion of the bellows and the concave end surface side of the top wall portion.
State sandwiched between the open end side of the cylinder case
Then, an end plate is attached to the outer surface of the top wall , and
From the cylinder plate side to the cylinder case side.
In a bellows pump in which the space between the top wall portion and the bellows is sealed by tightening using a bolt, the end plate is divided in a horizontal direction, and the end plate is divided.
Recesses are provided on the opposing surfaces of the end plates,
By interposing a compression spring in the recess, the top wall portion
So that the adhesion between the bellows and the
A bellows pump for transferring high-temperature liquid.