JPH07324684A - Rotary pump - Google Patents

Abstract

PURPOSE:To improve pump performance, the life of a pump and controllability without causing a drastic increase in costs. CONSTITUTION:Seal sheets 30, 31 for covering a suction part and a discharge part from the sides, able to be brought in contact with the side surface of a vane 12, and having flexibility are arranged in the positions inside side walls 7, 8 of a pump chamber 4. The seal sheets 30, 31 are formed by doughnut-like thin plates and made of polytetrafluoroethylene. The seal sheets 30, 31 are drawn to the inside by negative pressure to be generated on the suction part by the rotation of a rotor 9. Thereby, the seal sheets 30, 31 are deformed and brought in close-contact with sliding surfaces of vanes 12, 13 and the rotor 9, so as to seal the part. As a result, fluid is restrained from leaking out from the discharge part to the suction part in the pump chamber 4.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art The basic structure of a conventional manual rotary pump will be described with reference to FIG. In FIG. 4, reference numeral 1 denotes a pump main body, a suction port 2 is formed in the lower part thereof, and a discharge port 3 is formed in the upper part thereof. The pump body 1 is further provided with a cylindrical pump chamber 4 which communicates with the suction port 2 and the discharge port 3, respectively. The pump chamber 4 is configured to be closed by side plates 5 and 6 from both sides thereof, and inner side surfaces of the side plates 5 and 6 form side walls 7 and 8 of the pump chamber 4.

On the other hand, in the pump chamber 4, a rotor 9 is rotatably supported by the side plates 5 and 6. In this case, the axial center of the pump chamber 4 and the axial center of the rotor 9 are arranged in an eccentric state (see FIG. 2). The rotor 9 has a pair of vane guide grooves 10 extending in the radial direction thereof.
11 are formed at opposite positions in the radial direction,
The vanes 12 and 13 are arranged in the grooves 10 and 11, respectively. Reference numeral 15 is a spring for urging the vanes 12, 13 radially outward, and 14 is a rod for guiding the spring 15. Then, with the rotor 9 stored in the pump chamber 4, the vanes 12 and 13 have the spring 15
The vanes 12 and 13 are urged radially outward by the sliding force, so that the tips of the vanes 12 and 13 are brought into sliding contact with the annular peripheral wall 16 of the pump chamber 4.

The shaft portion 1 provided integrally with the rotor 9 is also provided.
7 is led out from the opening 18 of the one side plate 6 to the outside, and a handle 19 is attached thereto. Reference numeral 20 is a handle grip, and 21 is a fixing bolt. A suction pipe 22 is connected to the suction port 2 and a discharge pipe 23 is connected to the discharge port 3, and an adapter for engaging a mouth portion of a drum or the like is provided in the middle of the suction pipe 22. 24 is interposed.

In the rotary pump, as shown in FIG. 5, the suction pipe 22 is on the lower side, the discharge pipe 23 is on the upper side, the suction pipe 22 is inserted inside a drum can (not shown), and the handle 19 is inserted. The liquid inside is discharged from the discharge pipe 23 by rotating in the direction of the arrow in the figure, and the operating state at that time will be described based on FIG. First, by operating the handle 19, the rotor 9 and the vanes 12 and 13 in the pump chamber 4 rotate in the direction of the arrow in the figure.
Then, since the rotor 9 is eccentrically arranged, the volume of the suction portion (negative pressure side) 25 located behind the vane 12 with respect to the rotation direction gradually increases with rotation, thereby performing the suction action, while the vane 12 The volume of the discharge portion (the positive pressure side) 26 located in front of is gradually decreased with the rotation, whereby the discharge action is performed.

[0006]

By the way, in the rotary pump having the above structure, one of the main factors controlling the pump performance is each side surface of the vanes 12, 13 and the rotor 9 and the side wall 7 of the pump chamber 4. , 8, there is a problem of the gap. That is, if this gap size is too large, the amount of fluid leaking from the discharge part 26 to the suction part 25 increases, and sufficient performance cannot be obtained. On the other hand, if the above-mentioned gap size is too small, the vane 12 does not. , 13 and each side of the rotor 9,
Since the amount of wear with the side walls 7 and 8 of the pump chamber 4 increases, there is a problem that the life is shortened, or a large operating force is required due to an increase in frictional force, and the operability is deteriorated. is there.

Therefore, in the past, the above-mentioned gap was set in consideration of the fluid leakage, wear, friction and the like. However, in such a structure, the pump performance, life and operability are all deteriorated. Although it is not always in a satisfactory state, it has a drawback that high precision is required for processing and assembling.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and an object thereof is to improve pump performance, pump life, and operability as compared with the prior art without causing a significant increase in cost. Is to provide a rotary pump that can

[0009]

Therefore, in the rotary pump of claim 1, the pump chamber 4 having the annular peripheral wall 16 is provided in the pump body 1, and the rotor 9 is rotated between the side walls 7 and 8 of the pump chamber 4. The tip of the vane 12 attached to the rotor 9 is freely slidable, and the tip of the vane 12 is slidably brought into contact with the annular peripheral wall 16. By the rotation of the rotor 9, a suction portion 25 is provided in the pump chamber 4 rearward in the rotational direction of the vane 12. On the other hand, while forming the discharge part 26 in the front in the rotation direction, the fluid sucked from the suction port 2 is passed through the pump chamber 4 and the discharge port 3 is formed.
In the rotary pump that discharges from the suction chamber 25 and the discharge unit 2 at a position inside the side wall 7 of the pump chamber 4,
6 is covered from the side thereof, and a flexible seal sheet 30 capable of contacting the side surface of the vane 12 is arranged.

According to a second aspect of the present invention, the seal sheet 30 is a doughnut-shaped thin plate, the outer peripheral portion of which is attached to the pump body 1, and the inner peripheral portion of which is swingable. 9 and the vane 12 are slidably covered from the side.

Further, in the rotary pump of the third aspect, the seal sheet 30 is made of polytetrafluoroethylene.

According to another aspect of the rotary pump of the present invention, the shaft portion 17 of the rotor 9 is led out, and the lead portion is connected to the handle 19 so that the rotor 9 is manually rotated. It has a feature.

[0013]

In the rotary pump according to claim 1,
The seal sheet 30 is sucked inward by the negative pressure generated in the suction portion 25 by the rotation of the rotor 9. Then, the seal sheet 30 is deformed in conformity with the sliding contact surface of the vane 12 and the rotor 9, and seals this portion. As a result, fluid leakage from the discharge portion 26 to the suction portion 25 is suppressed in the pump chamber 4. Also, the seal sheet 30
Since it is not necessary to apply an excessive force from the outside in order to bring the vane into close contact with the vane 12 and the like, it is possible to prevent problems such as a reduction in life due to friction and a reduction in operability due to frictional force.

According to the rotary pumps of the second and third aspects, its implementation is easy, and the follow-up deformation action with respect to the negative pressure can be surely obtained.

Further, according to the rotary pump of the fourth aspect, since the rotational speed of the rotor 9 is slow, the follow-up deformation operation of the seal sheet 30 against the negative pressure is surely performed, so that the sealing action is more reliable. Become.

[0016]

EXAMPLE A specific example of the rotary pump of the present invention will be described below. However, the basic structure described as the prior art described above has the same structure as that of this example. The same functional parts are denoted by the same reference symbols, and detailed description thereof will be omitted. First, the most characteristic point of the rotary pump of this embodiment is that, as shown in FIG. 1, seal sheets 30 and 31 having a thickness of about 1 mm are provided between the pump body 1 and both side plates 5 and 6. This is the point of interposition. As shown in FIG. 3, the sealing sheets 30 and 31 are flexible donut-shaped thin plates, and are made of fluororesin such as polytetrafluoroethylene (polytetrafluoroethylene (polytetrafluoroethylene) in consideration of wear resistance, friction coefficient, corrosion resistance, etc. Product name: Teflon)
It is formed by.

The outer peripheral portions of the seal sheets 30 and 31 are
Together with the side plates 5 and 6, the bolts 27 ... 27 are fastened together and fixed to the pump body 1, and the inner peripheral portion thereof is in a free state (a state in which it can freely swing). A boss portion 28 protruding from the central portion of 9 is fitted. Therefore, as shown in FIG. 3, both side surfaces of the suction portion 25 and the discharge portion 26 in the pump body 1 are covered with the seal sheets 30 and 31, and both side surfaces of the vanes 12 and 13 and both side surfaces of the rotor 9 are covered. The seal sheet 30,
It will be in sliding contact with 31. In this case, on both side surfaces of the rotor 9, the side openings of the vane guide grooves 10 and 11 are covered with the seal sheets 30 and 31 up to the bottom thereof. The vanes 12 and 13 and both side surfaces of the rotor 9 and the seal sheets 30 and 31 may be in a dimensional relationship such that they are in close contact with each other, or a slight clearance is generated between them. You can
Within the range where the sealing function as described below is achieved,
It is preferable to provide some clearance in consideration of operability.

In the above structure, the handle 19 is operated,
When the rotor 9 and the vanes 12, 13 are rotated in the direction of the arrow in FIG. 3, a suction portion 25 on the negative pressure side is formed at the rear of the rotation direction of the vane 12, sucking the liquid from the suction port 2, while the vane 12 is rotated. A discharge portion 26 on the positive pressure side is formed in the front in the rotation direction of, and the liquid is discharged from the discharge port 3, whereby a pump action is performed. At this time, the seal sheets 30 and 31 are sucked inward by the negative pressure in the suction portion 25, and adhere to the sliding surfaces of the vanes 12 and 13 and the rotor 9. As a result, the vanes 12 and 13 and the rotor 9
The gap on the sliding surface of the pump is smaller than before, and the amount of liquid leaking from the discharge part (positive pressure part) 26 to the suction part (negative pressure part) 25 is reduced. Can be greatly improved.

Further, even if the sliding surfaces on both side surfaces of the vanes 12 and 13 and the rotor 9 are worn, the seal sheets 30 and 31
Since it is thin and easily bends, the negative pressure in the pump chamber 4 causes the seal surface to adhere to the sealing surface, so that deterioration of the pump suction performance over time can be significantly reduced as compared with the conventional case.

Even if abrasion occurs, only the seal sheets 30 and 31 need to be replaced, so that the maintenance cost can be reduced as compared with the conventional case where the side plates 5 and 6 are replaced as they are.

Although one embodiment of the rotary pump of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made and practiced. For example, although a manual pump is shown in the above embodiment, this may be a pump driven by a motor or the like. However, in the case of the manual type, since the rotation of the rotor 9 is gentle, the seal sheets 30 and 31 are surely deformed to follow the negative pressure side, so that there is an advantage that the pump performance can be surely and significantly improved. . Also usable fluid is petroleum,
There are a wide variety of chemicals, etc., but when corrosion resistance is particularly required, the pump main body 1, side plates 5, 6, rotor 9, vane 1
It is preferable that the pump constituent members such as 2 and 13 are made of synthetic resin. Further, in the above embodiment, the pump body 1
Although the seal sheets 30 and 31 are provided on both sides of the sheet, this may be performed by providing only one of them.

[0022]

As described above, in the rotary pump according to the first aspect of the present invention, the seal sheet is sucked inward by the negative pressure generated in the suction portion due to the rotation of the rotor, and is deformed following the vane and the sliding surface of the rotor. Close to
Since this part is sealed, fluid leakage from the discharge part to the suction part is suppressed in the pump chamber. Further, since it is not necessary to apply an excessive force from the outside to bring the seal sheet into close contact with the vane or the like, it is possible to prevent problems such as a reduction in life due to friction and a reduction in operability due to friction force. Furthermore, even if the vane or the sliding part of the rotor is worn, the sealing sheet is thin and easily bends, so the sealing function by the following deforming action to the negative pressure is maintained, and therefore the deterioration of pump performance over time is reduced compared to the past. To do. Moreover, even if the seal sheet is worn, it is not necessary to replace the side plate as it is, unlike the conventional case, and only the seal sheet needs to be replaced, so that the maintenance cost can be reduced.

According to the rotary pumps of the second and third aspects, the implementation thereof is easy and the follow-up deformation action with respect to the negative pressure can be surely obtained, so that the pump performance can be improved. .

Further, according to the rotary pump of the fourth aspect, since the rotational speed of the rotor is low, the follow-up deformation operation of the seal sheet against the negative pressure is surely performed, and therefore, the sealing action becomes more reliable. It is possible to improve the pump performance.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a rotary pump of the present invention.

FIG. 2 is a sectional view at another angle of the above-described embodiment and the conventional example.

FIG. 3 is a plan view for explaining the function of the seal sheet in the above embodiment.

FIG. 4 is an exploded perspective view showing the basic structure of the above embodiment and a conventional example.

FIG. 5 is an external view of the embodiment and the conventional example.

[Explanation of symbols]

 1 Pump Main Body 2 Suction Port 3 Discharge Port 4 Pump Chamber 7 Side Wall 8 Side Wall 9 Rotor 12 Vanes 13 Vanes 16 Annular Peripheral Wall 19 Handle 25 Suction Portion 26 Discharge Portion 30 Seal Sheet 31 Seal Sheet

Claims (4)

[Claims] 1. A pump chamber (4) having an annular peripheral wall (16) is provided in a pump body (1), and a rotor (9) is rotated between both side walls (7) and (8) of the pump chamber (4). The vane (12) attached to the rotor (9) is freely supported, and the tip of the vane (12) is brought into sliding contact with the annular peripheral wall (16), and the vane is rotated in the pump chamber (4) by the rotation of the rotor (9). The suction part (25) is formed on the rear side in the rotation direction of the (12), while the discharge part (26) is formed on the front side in the rotation direction, whereby the fluid sucked from the suction port (2) is transferred to the pump chamber (4). In the rotary pump that discharges from the discharge port (3) via the suction chamber (25) and the discharge unit (26) from the side, at a position inside the side wall (7) of the pump chamber (4). A flexible sheath that covers and can contact the side surface of the vane (12). A rotary pump having a cooling sheet (30) arranged therein. 2. The seal sheet (30) is a doughnut-shaped thin plate, the outer peripheral portion of which is attached to the pump body (1) and the inner peripheral portion of which can be swung, and the rotor (9). A rotary pump according to claim 1, characterized in that the vane (12) is slidably covered from its side. 3. The rotary pump according to claim 1, wherein the seal sheet (30) is polytetrafluoroethylene. 4. The shaft (17) of the rotor (9) is led out to the outside, and the lead-out portion is a handle (19).
The rotary pump according to any one of claims 1 to 3, characterized in that the rotor (9) is manually driven to rotate.