JPH1113647A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify structure, favorably supply a fluid having low fluidity, facilitate decomposition, and simplify washing of an internal part. SOLUTION: In this pump, a piston 6 is relatively reciprocatively in the direction crossing a rotation center R orthogonally, contained in the through- cylinder 5 of a rotor cylinder 4, contained in housings 2a and 2b in a manner to rotate around a rotation center R by a drive shaft. A suction port 10 and a discharge port 12 are in a manner to be communicated with two variable displacement spaces composed of the housings 2a and 2b, a through-cylinder 5, and the two end parts of the piston 6. A cam member 9 engaged with the notch engaging part 8 of the piston 6 and a cam member 9 is provided to engage with the notch engaging part 8 of the piston 6 and control movement of the piston 6. By rotating a drive shaft, fluid is sucked in a variable displacement space in a volume increasing state through the suction port 10 and a fluid is discharged through the discharge port 12 from the variable displacement space in a volume decreasing state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump technology, and more particularly to a structure of a pump suitably used for stably supplying a fluid having high viscosity or low fluidity. Examples of the supplied fluid include food materials.

[0002]

2. Description of the Related Art In the food manufacturing industry, liquid food materials such as bubu-an, okara, boiled beans for natto production, fish meat pickles for kamaboko production, and various cooking food ingredients (gyoza) , Shumai,
Ingredients such as hamburger steaks and croquettes are often handled. Materials having such fluidity (fluids)
After preparation, it is sent for subdivision packaging and the like. Conventionally, such feeding has been performed using a vane type (paddle type) pump.

[0003] However, when the viscosity of the fluid is high and the fluidity is low, the conventional vane-type pump described above may not be able to supply the fluid sufficiently. In particular, when the fluid is the food material, frequent cleaning of the inside of the pump is required from the viewpoint of food hygiene.

Therefore, an object of the present invention is to provide a simple structure,
An object of the present invention is to provide a pump capable of supplying a high-viscosity or low-fluidity fluid satisfactorily.

Another object of the present invention is to provide a pump that can be easily disassembled and can easily perform internal cleaning.

[0006]

According to the present invention, in order to achieve the above object, a rotary cylinder is housed in a housing so that the rotary cylinder can be rotated around a center of rotation by a drive shaft. A piston is accommodated in the through cylinder so as to be relatively reciprocable in a direction non-parallel to the direction of the rotation center, and the housing has the housing, the rotary cylinder, and both ends of the piston. A suction port and a discharge port are formed so as to be able to communicate with the two variable-volume spaces formed by the above. A cam that engages with the piston and controls the movement of the piston with respect to the through cylinder is formed in the housing. A member is provided, and a fluid is sucked into the volume-variable space in a volume-increasing state through the suction port by rotating the drive shaft. Made in the manner to discharge the fluid and from the variable volume space of volume reduction state through the discharge opening, a pump, characterized in that, is provided.

In one aspect of the present invention, the direction of relative movement of the piston with respect to the penetrating cylinder is orthogonal to the direction of the center of rotation.

In one aspect of the present invention, the cam member protrudes in the direction of the center of rotation and has a circular cross section perpendicular to the direction of the center of rotation. A notch engaging portion that engages with the member is formed.

According to the present invention, in order to achieve the above object, a rotary cylinder is housed in a housing so as to be connected to a drive shaft via a one-way clutch and rotated around a rotation center. A piston is accommodated in a penetrating cylinder of the rotary cylinder so as to be relatively reciprocable in a direction non-parallel to the direction of the rotation center, and the housing, the rotary cylinder, An intake port and a discharge port are formed so as to be able to communicate with two variable volume spaces formed by both ends of the piston, and the drive shaft is engaged with the piston and the penetrating cylinder of the piston is formed on the drive shaft. And a cam member for controlling the movement of the drive shaft with respect to the housing by alternately repeating forward rotation and reverse rotation of the drive shaft. With the rotation of the rotary cylinder stopped, the piston is moved with respect to the penetrating cylinder to suck fluid into one of the volume variable spaces through the suction port and from the other through the discharge port. A first operation of discharging the fluid, and rotating the rotary cylinder with respect to the housing with the movement of the piston relative to the penetrating cylinder stopped to discharge the fluid sucked into the one volume variable space. A pump configured to repeat the second operation of moving to the communication position with the outlet.

In one embodiment of the present invention, the forward rotation and the reverse rotation are each a half rotation.

In one aspect of the present invention, the direction of relative movement of the piston with respect to the penetrating cylinder is orthogonal to the direction of the rotation center.

In one embodiment of the present invention, the cam member has a circular shape, and the piston has a notch engaging portion for engaging with the cam member.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing a first embodiment of a pump according to the present invention, and FIGS. 2 and 3 are sectional views showing an assembled state thereof.

In these figures, reference numeral 2a denotes a housing main body, 2b denotes a housing lid, and the housing lid 2b is fixed to the housing main body 2a by bolts. The housing 2 is composed of the main body 2a and the lid 2b.

A rotary cylinder 4 having a substantially cylindrical outer shape is arranged in the housing 2. The rotary cylinder 4 is rotatable around a rotation center R in the Z direction in the housing 2. The rotary cylinder 4 has a penetrating cylinder 5 having a circular cross section in a direction orthogonal to the Z direction (Y direction in FIG. 1). A piston 6 is housed in the penetrating cylinder 5, and the piston 6 can reciprocate in the penetrating cylinder 5 in the direction (Y direction in FIG. 1). The piston 6 has a notch engaging portion 8 formed by cutting out a half portion in the Z direction at a substantially central portion in the direction. A cam member 9 attached to the housing lid 2b is arranged in the housing 2. The cam member 9 has a circular cross section in the XY plane, and protrudes in the Z direction. This cam member 9
Has a diameter slightly smaller than the dimension of the notch engaging portion 8 in the Y direction, and is accommodated and engaged in the notch engaging portion 8. FIG.
As shown in FIG. 3, the center of symmetry S of the cam member 9 is eccentric from the center of rotation R. The direction of this eccentricity is
As shown in FIG. 2, the direction is at an angle of 45 degrees with the Y direction.

The housing main body 2a can communicate with two variable volume spaces formed by the housing main body 2a, the penetrating cylinder 5 of the rotary cylinder 4, and both ends of the piston 6 (both ends in the Y direction in FIG. 1). Like, Y
A suction port 10 and a discharge port 12 are formed at positions facing each other in the direction.

As shown in FIG. 3, a drive shaft 16 (or a motor output rotary shaft itself) connected to a motor output rotary shaft (not shown) is connected to the housing main body 2a. Housing main body 2 so that it can rotate freely.
a and is inserted into the housing 2. The drive shaft 16 is connected to the rotary cylinder 4 by connecting means such as a key and a spline.

In this embodiment, when the drive shaft 16 rotates, the rotary cylinder 4 connected to the drive shaft 16 rotates around the Z direction. With the rotation of the rotary cylinder 4, the piston 6 reciprocates in the penetrating cylinder 5 in that direction based on the engagement relationship between the notch engaging portion 8 of the piston 6 and the cam member 9.

Next, the operation of this embodiment will be described with reference to FIG. 4 and further FIGS.

In the state shown in FIG. 4A, the piston 6 is oriented horizontally in the penetrating cylinder 5, the suction port 10 communicates with the first volume variable space C1, and the discharge port 12 communicates with the second volume variable space. The space C2 communicates. Engaging part 8 of piston 6
The first volume variable space C
The volume of 1 is larger than the volume of the second variable volume space C2.

In the state shown in FIG. 4B in which the drive shaft 16 rotates clockwise by 45 degrees from the state shown in FIG. 4A, the piston 6 is inclined at an angle of 45 degrees with respect to the horizontal plane in the penetrating cylinder 5. I have. In this state, the first variable volume space C1
The communication between the suction port 10 and the discharge port 12 of both the first and second variable volume spaces C2 is cut off. Engaging part 8 of piston 6
The first volume variable space C
4 is larger than the state of FIG. 4A (the maximum value of C1), and the second variable volume space C2
Is smaller than the state shown in FIG. 4A (the minimum value of C2).

In the state shown in FIG. 4C in which the drive shaft 16 rotates clockwise by 45 degrees from the state shown in FIG. 4B, the piston 6 is oriented vertically in the penetrating cylinder 5.
The suction port 10 communicates with the second variable volume space C2, and the discharge port 12 communicates with the first variable volume space C1. Due to the engaging relationship between the engaging portion 8 of the piston 6 and the cam member 9, the first
The volume of the variable volume space C1 is smaller than the volume of the second variable volume space C2.

In the state shown in FIG. 4D in which the drive shaft 16 rotates clockwise by an angle of 45 degrees from the state shown in FIG. 4C, the piston 6 is inclined at an angle of 45 degrees with respect to a horizontal plane in the penetrating cylinder 5. In addition, the suction port 10 communicates with the second variable volume space C2, and the discharge port 12 communicates with the first variable volume space C1. Due to the engaging relationship between the engaging portion 8 of the piston 6 and the cam member 9, the volume of the first variable volume space C1 and the volume of the second variable volume space C2 are equal.

When the drive shaft 16 is rotated clockwise by 45 degrees from the state shown in FIG. 4D, the state in which the first variable volume space C1 and the second variable volume space C2 are alternated in FIG. 4A. Becomes Then, when the drive shaft 16 is again rotated by 180 degrees, the operation described with reference to FIGS. 4A to 4D is performed in which the first variable volume space C1 and the second variable volume space C2 are alternated. You. Hereinafter, the same operation is continued. Therefore, two suction / discharge operations are performed during one rotation of the rotary cylinder 4.

In the above process, the volume of one of the variable volume spaces gradually increases from FIG. 4B to FIG. 4B again. At the same time, the volume of the other variable volume space gradually decreases, and the fluid is discharged through the discharge port 12 from the variable volume space in the volume reduced state.

In this embodiment, no special valve opening / closing operation is required, and no special mechanism is required. Furthermore, in this embodiment, the number of components can be significantly reduced. Thus, according to the present embodiment, cost reduction is realized. Further, a fluid having high viscosity or low fluidity can be satisfactorily supplied.

Further, in this embodiment, when disassembling and reassembling the apparatus for internal cleaning, maintenance and inspection, etc., only the operation of removing the bolt from the housing lid 2b is performed.
The disassembly mode as shown in FIG. 1 is easily realized, and the reassembly is similarly easy.

FIG. 5 is an exploded perspective view showing a second embodiment of the pump according to the present invention, and FIGS. 6 and 7 are sectional views of an assembled state thereof. In these drawings, members having the same functions as those in FIGS. 1 to 4 are denoted by the same reference numerals.

In this embodiment, the drive shaft 16 is rotatably mounted on the housing lid 2b by a bearing. The drive shaft 16 is provided with a cam member 9 '. The cam member has a circular shape when viewed in the Z direction, and as shown in FIG.
Is eccentric from the rotation center R. In the present embodiment, the drive shaft 16 extends through the piston 6. However, of course, the piston 6 can move with a required stroke with respect to the penetrating cylinder 5.

In this embodiment, a one-way clutch 20 is provided between the drive shaft 16 and the rotary cylinder 4.
Is interposed. Therefore, the rotary cylinder 4
Is allowed to rotate only in one direction with respect to the drive shaft 16 and is locked in the other direction.

Next, the operation of the present embodiment will be described with reference to FIG. 8 and further FIGS.

In the state shown in FIG. 8A, the piston 6 is oriented horizontally in the penetrating cylinder 5, the suction port 10 communicates with the first variable volume space C1, and the discharge port 12 communicates with the second variable volume. The space C2 communicates. Engaging part 8 of piston 6
And the cam member 9 ', the volume of the first variable volume space C1 (the maximum value of C1) is larger than the volume of the second variable volume space C2 (the minimum value of C2). In this state, the first
The fluid is sucked into the variable volume space C1 through the suction port 10.

When the drive shaft 16 rotates clockwise (forward rotation) from the state shown in FIG.
Is turned on, so that the rotary cylinder 4
6, and the engagement relationship between the engagement portion 8 of the piston 6 and the cam member 9 'is unchanged. Therefore, in the state of FIG. 8B in which the drive shaft 16 is rotated forward by 90 degrees, the piston 6 is oriented vertically in the through cylinder 5 and
Both the variable volume space C1 and the second variable volume space C2 are disconnected from the suction port 10 and the discharge port 12. First
The volume of the variable volume space C1 and the volume of the second variable volume space C2 are the same as those in the state of FIG. 8A.

When the drive shaft 16 rotates forward from the state shown in FIG. 8B, the one-way clutch 20 is turned on, so that the rotary cylinder 4 rotates together with the drive shaft 16, and
The engagement relationship between the engagement portion 8 of the piston 6 and the cam member 9 'is unchanged. Therefore, in the state of FIG. 8C in which the drive shaft 16 is rotated forward by 90 degrees, the piston 6
The suction port 10 and the second variable volume space C2 communicate with each other, and the discharge port 12 and the first variable volume space C
1 is in communication. Both the volume of the first variable volume space C1 and the volume of the second variable volume space C2 are shown in FIG.
It is the same as that in the state of (b).

When the drive shaft 16 rotates counterclockwise (reverse rotation) from the state shown in FIG.
Since 0 is in the OFF state, the rotary cylinder 4 does not rotate regardless of the rotation of the drive shaft 16. On the other hand, in the state shown in FIG. 8D in which the engagement relationship between the engagement portion 8 of the piston 6 and the cam member 9 ′ changes and the drive shaft 16 is reversed by an angle of 180 degrees, the piston 6 , The volume of the first variable volume space C1 changes from the maximum value to the minimum value, and the volume of the second variable volume space C2 changes from the minimum value to the maximum value. Thereby, a part of the fluid in the first variable volume space C1 (the volume of the difference between the maximum value and the minimum value of C1) is discharged from the discharge port 12 and at the same time, the suction port 10
The fluid (the volume of the difference between the maximum value and the minimum value of C2) is sucked into the second variable volume space C2 from.

FIG. 8D shows the state in which the first variable volume space C
8A is the same as FIG. 8A except that 1 and the second variable volume space C2 are interchanged. And again,
When the normal rotation and the reverse rotation of the drive shaft 16 at an angle of 180 degrees are performed, the operation described in FIGS. 8A to 8D in which the first variable volume space C1 and the second variable volume space C2 are alternated. Done. Hereinafter, the same operation is continued. Therefore, two suction / discharge operations are performed during one rotation of the rotary cylinder 4.

It will be easily understood that, in the present embodiment, the rotation angles of the normal rotation and the reverse rotation can be other than 180 degrees. In this case, the inlet 10
The arrangement of the discharge port 12 and the shape of the cam member 9 ′ may be appropriately set in accordance with the relationship.

In this embodiment, no special valve opening / closing operation is required, and no special mechanism is required. Furthermore, in this embodiment, the number of components can be significantly reduced. Thus, according to the present embodiment, cost reduction is realized. Further, a fluid having high viscosity or low fluidity can be satisfactorily supplied.

In this embodiment, since the fluid discharge from the discharge port 12 is intermittent, the fluid cutting means is arranged adjacent to the discharge port 12 so that By operating at the timing, it is possible to easily supply the fluid by dividing it into small portions.

Further, in the present embodiment, when disassembling and reassembling the apparatus for internal cleaning, maintenance and inspection, etc., only the operation of removing the bolt from the housing lid 2b is performed.
The disassembly mode as shown in FIG. 5 is easily realized, and the reassembly is similarly easy.

[0042]

As described above, according to the present invention, there is provided a pump which has a simple structure, is easy to manufacture at low cost, and can supply a high viscosity or low fluidity fluid. Further, according to the present invention, there is provided a pump which is easy to disassemble and assemble.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a pump according to the present invention.

FIG. 2 is a sectional view showing an assembled state of the first embodiment of the pump according to the present invention.

FIG. 3 is a sectional view showing an assembled state of the first embodiment of the pump according to the present invention.

FIG. 4 is an operation explanatory view of the first embodiment of the pump according to the present invention.

FIG. 5 is an exploded perspective view showing a second embodiment of the pump according to the present invention.

FIG. 6 is a sectional view showing an assembled state of a second embodiment of the pump according to the present invention.

FIG. 7 is a sectional view showing an assembled state of a second embodiment of the pump according to the present invention.

FIG. 8 is an operation explanatory view of a second embodiment of the pump according to the present invention.

[Explanation of symbols]

 2 Housing 2a Housing main body 2b Housing lid 4 Rotary cylinder 5 Penetrating cylinder 6 Piston 9, 9 'Cam member 10 Inlet 12 Discharge port 16 Drive shaft 20 One-way clutch C1 First variable volume space C2 Second variable volume space R Center of rotation S Center of symmetry

Claims (7)

[Claims] A rotary cylinder is accommodated in a housing so as to be rotated around a rotation center by a drive shaft, and a rotary cylinder is provided in a through cylinder of the rotary cylinder in a direction non-parallel to the direction of the rotation center. A piston is housed so as to be able to reciprocate in a reciprocating manner. The housing has an inlet and an inlet so as to be able to communicate with two variable volume spaces formed by the housing, the rotary cylinder, and both ends of the piston. A discharge port is formed, and the housing is provided with a cam member that engages with the piston and controls movement of the piston with respect to the penetrating cylinder, and the suction port is formed by rotating the drive shaft. The fluid is sucked into the volume-variable space in the volume-increasing state via the outlet and flows from the volume-variable space in the volume-decreased state through the discharge port. A pump configured to discharge a moving body. 2. The pump according to claim 1, wherein a direction of a relative movement of the piston with respect to the penetrating cylinder is orthogonal to a direction of the rotation center. 3. The cam member protrudes in the direction of the center of rotation and has a circular cross section perpendicular to the direction of the center of rotation. The piston has a notch engaged with the cam member. The pump according to claim 2, wherein an engagement portion is formed. 4. A rotary cylinder is accommodated in the housing via a one-way clutch with respect to a drive shaft so as to be rotatable about a rotation center, and the rotation center is provided in a through cylinder of the rotary cylinder. A piston is accommodated in the housing so as to be relatively reciprocable in a direction non-parallel to the direction of the arrow. The housing has two variable volume spaces formed by the housing, the rotary cylinder, and both ends of the piston. A suction port and a discharge port are formed so as to be able to communicate with the drive shaft; and the drive shaft is provided with a cam member that engages with the piston and controls movement of the piston with respect to the through cylinder. The rotation of the rotary cylinder with respect to the housing is stopped by alternately repeating the forward rotation and the reverse rotation of the drive shaft. A first operation of moving a ston with respect to the penetrating cylinder to suck fluid into one of the variable volume spaces through the suction port and discharge the fluid from the other through the discharge port; Rotating the rotary cylinder with respect to the housing in a state where the movement of the piston with respect to the penetrating cylinder is stopped, and moving the fluid sucked into the one volume variable space to a communication position with the discharge port. A pump characterized by repeating the above operation. 5. The pump according to claim 4, wherein each of the forward rotation and the reverse rotation is a half rotation. 6. The pump according to claim 4, wherein a direction of relative movement of the piston with respect to the penetrating cylinder is orthogonal to a direction of the rotation center. 7. The pump according to claim 6, wherein the cam member has a circular shape, and the piston has a notch engaging portion that engages with the cam member.