JPH0744554U - Hose pump - Google Patents

Abstract

(57) [Summary] [Object] To provide a hose pump having a simple structure and capable of reliably generating a restoring force for raising a hose by a negative pressure to a desired size. [Structure] One end of a duct (32) communicates with an internal space (46) of a casing (10), and the other end of the duct (32) communicates with the atmosphere.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention provides a casing having a delivery connection member and a suction connection member, a hose connected to the delivery connection member and the suction connection member and in contact with an inner wall of the casing, and at least two compression bodies. And a compression body movable along the hose so that the hose is compressed by the compression body from the direction of the suction connection member to the direction of the delivery connection member, and the compression body is disposed in the internal space of the casing. The present invention relates to a hose pump that is an elastically deformable duct and has a duct that can be compressed from one end to the other end by movement of a compression body.

[0002]

[Prior art]

 There are different types of hose pumps of this kind depending on how the hose is made to rise again in the suction area behind the compression body.

For example, a hose pump provided with an elastic hose having a relatively high specific restoring force is known. In this case, the desired restoring force depends on the desired suction height of the pump.

In other known hose pumps, the restoring force of the hose is generated by the negative pressure inside the pump. Various methods for producing or maintaining the required negative pressure inside the hose pump are known from West German patent DE 3703124. According to the first embodiment, the negative pressure on the suction side, which is necessary for restoring the compressed hose, is generated by the partition device including the packing member and the partition member. In this case, the packing member is connected to the casing peripheral wall in a short area between the suction connection member and the delivery connection member, and in this range, the elastic member is in close contact with the partition member, the front wall, the rear wall and the peripheral wall. It is packing. The partition member, on the other hand, is formed as a packing which is guided around an impeller provided with a compression body and which seals the front and rear walls respectively. When such a partition device is used, a negative pressure of a magnitude corresponding to the required suction height is generated on the pump suction side. A similar function is obtained according to another embodiment by filling all the free space inside the pump with liquid. If the compact moves over a portion of the hose while it is filled with liquid and then crushes another portion of the hose, the previously crushed portion may remain uncrushed. This is thought to be due to the formation of hollow spaces in the filled liquid, but this is not possible. That is, as a result of the action of the liquid, as soon as the compression body further rotates, a negative pressure is generated which causes the crushed portions of the hose to rise again. Therefore negative pressure causes the hose to rise. Therefore, a very high rotation speed and conveyance force can be obtained. Also in this embodiment, the negative pressure generated when the compression body rotates further corresponds exactly to the negative pressure in the hose on the suction side. Therefore, even with this pump, the suction height is automatically generated.

Compared to a hose pump equipped with an elastic hose, a hose pump in which the hose is restored by a negative pressure is more complicated in structure. This is because it requires a vacuum structure. That is, when the partitioning device is installed, the generation of negative pressure depends on the vacuum connection of the parts that relatively move in the casing. If the vacuum pump is completely filled with liquid and the vacuum is too high, a small amount of lubricating oil inside the hose pump casing will foam, which will or will not result in a restoring force that causes the hose to rise. However, there is a problem that it is small.

[0006]

[Problems to be solved by the device]

 The object of the present invention is to construct a hose pump of this kind as follows on the premise of the above-mentioned conventional technique, that is, the structure is simple, and the restoring force for raising the hose can be more reliably and desired by negative pressure. It is to be constructed so that it can be generated in size.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is an elastically deformable duct arranged in an inner space of a casing, wherein the one end of the duct is compressible from one end to the other end by movement of a compression body. Is connected to the internal space of the casing, and the other end of the duct is connected to the atmosphere.

[0008]

[Operation and effect of the device]

 The technical idea of the present invention is that when the hose pump is operated, the same compression as that generated in the hose is also generated in the duct, so that air is pushed out from the inner space of the casing, thereby creating a vacuum in the inner space of the casing. It is possible, or by maintaining this vacuum, it is at the point of raising (returning) the compressed hose. The diameter of this duct can be very small. Therefore, the original hose used for transportation does not need to be elastically deformable and can be re-started by negative pressure, and thus the advantages of the vacuum pump can be utilized.

The hose pump according to the invention is fully functional when the required negative pressure is created in the internal space of the casing. In order to make the start-up time of this type of hose pump as short as possible, the duct is connected to the atmosphere via a check valve which opens towards the atmosphere surrounding the casing. Therefore, when the hose pump is not operating, air cannot enter the interior space of the casing, so that when the hose pump is stopped, the negative pressure is not lost even if the compression body is not in close contact with the duct. This is desirable to maximize the life of the hose. In this way, the hose pump according to the present invention is ready for full operation.

Providing the duct inside the wall of the hose makes the structure even simpler. If the hose is installed, for example during the first installation or replacement, the duct is also installed at the same time. Therefore, the duct is always placed in the correct position with respect to the hose and thus also with respect to the compression body.

Forming the duct by a hollow space provided in the wall of the hose simplifies the manufacture of the duct. In this case, the duct is merely a duct-like hole in the wall of the hose, so that the actual hose wall for the duct is unnecessary.

It is very advantageous if the duct is provided in the hose jacket such that it is closer to the inner surface than to the outer surface of the hose. The duct must, of course, be located in the hose in terms of its extent so that when the hose is crushed the cross section is also completely crushed. Therefore, it is advantageous to provide the duct in the curved region of the hose. Since the duct is located on the inner surface of the hose rather than the outer surface, the duct is located in the outermost area of the hose that is maximally loaded when the hose is crushed. Therefore, if the hose is damaged (which is unavoidable after many years of use), the envelope area surrounding the duct is torn inward, so that the interior space of the duct communicates with the interior space of the hose. This has the great advantage that the medium carried in the hose exits the duct opening when the hose pump is activated. That is, when the compression body operates at this time, the medium conveyed in the hose flows into the duct and is pushed out from there. This can be confirmed by suitable monitoring equipment and the hose pump can be stopped immediately. In this way, the duct also functions as a hose monitor, as it is in the most loaded area of the hose and immediately informs you that a part of the hose has torn and needs to be replaced. Even if the hose is fully functional for the time being, it may be expected to tear and break in a short time, so the above-mentioned function of the duct is preferable. Therefore, when the hose pump is used for conveying food and drink, the hose pump can be stopped before the hose breaks, so that the food and drink being conveyed does not mix with the lubricating oil inside the hose pump. Therefore, the hose pump can be used for transportation of food and drink without any anxiety.

[0013]

【Example】

 The present invention will now be described in detail with reference to the embodiments illustrated in the accompanying drawings.

The hose pump casing 10 has two connecting members. In the drawing, the left connecting member is the suction connecting member 12, and the right connecting member is the delivery connecting member 14. The rotation direction 16 of the impeller 18 provided in the casing 10 is counterclockwise.

Both connecting members 12, 14 project through the upper region 20 of the casing 10 into the internal space 46 of the casing 10 and are connected to each other by a hose 22.

The hose 22 contacts the inner surface of the casing 10 at the cylindrical lower compression region 24 of the casing 10. On the other hand, although not shown, it may be in contact with the inner surface of the casing 10 via a cushion layer. The impeller 18 and the compression body 26 that is provided on the impeller 18 and is in contact with the hose 22 so as to crush the hose 22 form a tubular outer covering surface 30 with respect to the outside. The tubular outer cover surface 30 is in close contact with the sealing wall (which is located parallel to the plane of the drawing) on the end face side of the casing 10. The above components correspond to those known in conventional hose pumps.

The wall 31 of the hose 22 provided inside the casing 10 has a duct 32. The duct 32 extends parallel to the longitudinal axis 34 of the hose 22. The duct 32 is then arranged so that it is closer to the inner surface 36 than to the outer surface 38 of the wall 31. Further, the hole 32 is arranged so as to be located in the curved region 40 (left side in FIG. 3) of the hose 22 with respect to its spread. In the curved region 40, the hose turns its cross section 180 ° under the action of the force of the compression body 26, so that the load is maximized in this curved region 40.

The duct 32 of the hose 22 has a hole 44 in the region of the suction connection member 12. The hole 44 communicates with the internal space 46 of the casing 10 in the upper region of the casing 10. The duct 32 has an airtight joint with the discharge duct 50 in the region of the delivery connection member 14. The other end of the exhaust duct 50 communicates with the atmosphere outside the casing 10 and penetrates the packing ring 52.

The delivery connecting member 14 has a male screw 54 at its upper end. A cap nut 56 is screwed into the male screw 54 so as to press the packing ring 52 and the upper region 20 of the casing 10. Similarly, the suction connecting member 12 is also fixed to the casing 10, and thus to the hose 22. Since the duct 32 communicates with the internal space 46 of the casing 10 by the hole 44, the suction connection member 12 does not have the discharge duct 50.

The operation mode of the hose pump shown in FIGS. 1 to 3 is as follows.

When the impeller 26 rotates in the rotation direction 16, air is sucked out from the inner space 46 of the casing 10 through the hole 44 and is discharged from the exhaust duct 50 to the atmosphere surrounding the casing 10. The duct 32 is also compressed in this position so that the hose 22 is completely compressed in its respective position during rotation of the compression body 26 in the direction of rotation 16 and thus its cross section is completely crushed (FIG. 3). It is completely compressed by the body 26 and thus occluded.

When the hose 22 tears over time, a tear of this kind first occurs inside the curved regions 40, 41. Since there is also a duct 32 in this curved area, a crevice of this kind causes the duct 32 to open inwards, so that the duct 32 loses its function. However, in this condition the hose 22 is still fully functional. This is because the medium conveyed through the inside of the hose 22 flows out from the discharge duct 50 instead of air. When the hose pump is used in the field of food and drink, for example, when carrying soup, a part of this soup flows out from the discharge duct 50. Therefore, the operation of the hose pump can be stopped when the hose 22 is still in a functioning state and the lubricating liquid inside the casing 10 is not mixed with the medium such as soup to be conveyed. Therefore, this type of hose pump can be used without anxiety in the field of food and drink in a proper usage for food and drink.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hose pump according to the present invention.

2 is a perspective view of a portion of a hose used in the hose pump of FIG.

FIG. 3 is a diagram showing the hose of FIG. 2 in a crushed state.

[Explanation of symbols]

 10 Casing 12 Connection Member for Suction 14 Connection Member for Delivery 22 Hose 24 Inner Wall of Casing 26 Compressed Body 32 Duct 46 Internal Space of Casing

Claims (6)

[Scope of utility model registration request] A casing (10) comprising a delivery connecting member (14) and a suction connecting member (12), and a casing connected to the delivery connecting member (14) and the suction connecting member (12). A hose (22) in contact with the inner wall (24) of (10) and at least two compression bodies (26), wherein the hose (22) is connected to the suction connection member (12) by the compression bodies (26). (26) movable along the hose (22) so as to be compressed in the direction from the direction toward the delivery connection member (14), and the casing (10).
Hose pump having an elastically deformable duct (32) disposed in the internal space (46) of the compressor, the duct (32) being compressible from one end to the other end by movement of the compression body (26). In the hose pump, the one end of the duct (32) communicates with the internal space (46) of the casing (10), and the other end of the duct (32) communicates with the atmosphere. 2. The duct (32) comprises a casing (10).
The hose pump according to claim 1, wherein the hose pump communicates with the atmosphere through a check valve that opens in the direction of the atmosphere surrounding the hose. 3. Hose pump according to claim 1 or 2, characterized in that the duct (32) is arranged in the casing (10) so as to extend parallel to the hose (22). 4. A hose pump according to claim 3, characterized in that the duct (32) is inside the wall of the hose (22). 5. Hose pump according to claim 4, characterized in that the duct (32) is formed by a hollow space provided in the wall of the hose (22). 6. The hose (22) is characterized in that a hollow space (32) is provided closer to the inner surface (36) than to the outer surface (38) of the hose (22). The hose pump according to claim 4 or 5.