JP4028777B2 - Trochoid pump - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a trochoid pump that is composed of three or more rotors having a trochoidal tooth profile, and that can deliver a large amount of fluid while being particularly small, and can reduce pulsation during pump operation. .
[0002]
[Prior art]
Conventionally, various trochoid pumps exist. Japanese Patent Publication No. 40-11104 discloses a multiple pump in which a suction chamber and a discharge port are provided with gap chambers of different sizes inside and outside. This invention discloses a similar pump comprising a three-stage trochoid pump comprising an inner rotor, an intermediate rotor and an outer rotor, or an involute toothed rotor. The inner suction and discharge ports for sending fluid from the gap chambers of the inner rotor and the intermediate rotor are formed small.
[0003]
In addition, the outer suction and discharge ports for sending fluid from the gap chambers of the intermediate rotor and the outer rotor are formed small. In this pump, the area and volume of the outer suction and discharge ports are formed larger than the area and volume of the inner suction and discharge ports. Furthermore, the inner space formed by the inner rotor and the intermediate rotor has a different volume from the space formed by the intermediate rotor and the outer rotor. Further, the suction hole and the discharge hole are arranged in a state in which the expansion sides are mutually inverted.
[0004]
[Problems to be solved by the invention]
Since the inner pump and the outer pump are reversed, the pump fluid is sucked in from the inner suction port, and the pressurized fluid is sent from the inner discharge port to the outer suction port. The resulting fluid is further pressurized at the outer discharge port, forming a pressurized fluid and constituting a multi-stage pump delivered from the pump.
[0005]
However, when fluid flows from the small inner space formed by the inner rotor and the intermediate rotor to the large outer space formed by the intermediate rotor and the outer rotor, the fluid is sufficiently fed into the large outer space. It is difficult, and the outside void chamber is in an aeration state, the efficiency of the pump deteriorates, and it is difficult to improve the pump performance. The present invention improves the pump efficiency of a trochoid pump composed of a multi-stage trochoid rotor group so that a large amount of fluid can be delivered smoothly.
[0006]
[Means for Solving the Problems]
In view of the above, the inventor has intensively studied to solve the above problems, and as a result, the present invention has been formed with a trochoid rotor group including an inner rotor, an intermediate rotor, and an outer rotor, and a suction side partition portion. An inner suction port portion and an outer suction port portion, a suction port including the inner suction port portion and the outer suction port portion sharing a suction port, and an inner discharge port portion in which the discharge side partition portion is formed. An outer discharge port portion, and a casing having a partition portion between the inner discharge port portion sharing the discharge port and the discharge port including the outer discharge port portion, and the inner rotor in the trochoidal rotor group And the inner air gap chamber group formed by the intermediate rotor has an inner suction portion in which the suction-side partition portion disposed via the partition portion is formed. A suction port sharing the suction port and the suction port, an inner discharge port portion where the discharge-side partition portion is formed, and a discharge port sharing the discharge port, and formed by the intermediate rotor and the outer rotor. The outer void chamber group is formed with an outer suction port portion in which the suction-side partition portion disposed via the partition portion is formed, a suction port sharing the suction port, and the discharge-side partition portion. By adopting a trochoid pump that communicates with the outer discharge port and the discharge port that shares the discharge port, the pump efficiency of the trochoid pump composed of a multi-stage trochoid rotor group is improved, and a large amount of fluid is delivered. In this way, the above-mentioned problems can be solved.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present invention, as shown in FIG. 1 (A), a rotor group composed of three trochoidal rotors having an inner rotor 1, an intermediate rotor 2 and an outer rotor 3 having a trochoidal tooth profile is housed in a casing A. is there. This trochoid rotor group is the same as a combination of an inner rotor and an outer rotor of a normal trochoid pump, and as shown in FIG. 1A, an inner rotor 1 is disposed at the center, and the inner rotor 1 is inherent. Thus, the intermediate rotor 2 is arranged, and the outer rotor 3 is arranged so that the intermediate rotor 2 is present.
[0008]
In this way, the inner rotor 1 is positioned in the center, and the intermediate rotor 2 and the outer rotor 3 are combined so as to surround the outer side thereof, and are accommodated in a casing A described later. Further, as shown in FIG. 3A, the inner rotor 1 is formed with only the external teeth 1a. As shown in FIG. 3C, the intermediate rotor 2 is formed with internal teeth 2a and external teeth 2b. As shown in FIG. 3E, the outer rotor 3 is formed with only the inner teeth 3a. Here, the number of external teeth 1a of the inner rotor 1 is one less than the number of internal teeth 2a of the intermediate rotor 2, and the number of external teeth 2b of the intermediate rotor 2 is equal to the number of internal teeth 3a of the outer rotor 3. The number of teeth is one less than the number of teeth.
[0009]
When the inner rotor 1 rotates once, the intermediate rotor 2 rotates with a delay of one tooth. Similarly, when the intermediate rotor 2 rotates once, the outer rotor 3 rotates with a delay of one tooth. In this way, as shown in FIG. 1A, the outer teeth 1a of the inner rotor 1 and the inner teeth 2a of the intermediate rotor 2 are engaged with each other, so that there is a gap between the contact points of the outer teeth 1a and the inner teeth 2a. A chamber is formed. These void chambers change in volume as the rotor rotates, and perform suction and discharge of fluid.
[0010]
The gap chamber formed by the outer teeth 1a of the inner rotor 1 and the inner teeth 2a of the intermediate rotor 2 is referred to as inner gap chambers S ₁ , S ₁ ,. Similarly, the outer teeth 2b of the intermediate rotor 2 and the inner teeth 3a of the outer rotor 3 are meshed at one place, but a gap chamber is formed between the contact points of the outer teeth 2b and the inner teeth 3a at other places. These gap chambers formed by the intermediate rotor 2 and the outer rotor 3 are referred to as outer gap chambers S ₂ , S ₂ ,.
[0011]
Next, as shown in FIGS. 2A and 2B, the casing A has a rotor chamber 6 formed in the main body 5. A rotor group including the inner rotor 1, the intermediate rotor 2 and the outer rotor 3 is accommodated in the rotor chamber 6. The rotor chamber 6 includes a bottom surface portion 6 a and a side surface portion 6 b, and the side surface portion 6 b has a circular inner peripheral surface, which is a portion close to the outer peripheral side surface of the outer rotor 3. Therefore, the diameter of the portion where the side surface portion 6b constitutes the circumferential inner wall surface has a diameter necessary for the outer rotor 3 to be housed and rotated. A boss 7 is formed at the center of the rotor chamber 6. The boss portion 7 is formed with a bearing hole 7 a for the drive shaft of the inner rotor 1.
[0012]
A suction port 8 and a discharge port 9 are formed on the bottom surface portion 6 a of the rotor chamber 6. The suction port 8 includes a suction port 8a, an inner suction port portion 8b, and an outer suction port portion 8c. The inner suction port portion 8b is formed in a substantially half-moon shape in a substantially half region around the boss portion 7 on both the left and right sides of the boss portion 7. Further, an outer suction port portion 8c is formed along the outer periphery of the inner suction port portion 8b.
[0013]
Further, a suction side partition portion 8d between the inner suction port portion 8b and the outer suction port portion 8c is formed as an arcuate wall. A suction flow path 8a ₁ extending from the suction port 8a to the inner suction port portion 8b and the outer suction port portion 8c is formed. Inlet 8a and the suction passage 8a ₁ is a site where the and the inner suction port part 8b and the outer suction port part 8c share. That is, receive fluid from the inner suction port part 8b and the outer suction port part 8c are both inlet 8a, in which the fluid through the suction passage 8a ₁ flows into the inner suction port part 8b and the outer suction port part 8c.
[0014]
The suction flow path 8a ₁ passes through the outer suction port portion 8c as shown in FIGS. 2 (A) and 2 (B). Furthermore, the suction-side partition portion 8d, the spaced at appropriate intervals in the intermediate position and, in its spaced-apart regions, the suction passage 8a ₁ is positioned so as to intersect. The flow of fluid into the inner suction port part 8b are those flowing through the intake passage 8a ₁ from the separated region of the suction-side partition portion 8d.
[0015]
Next, the discharge port 9 includes a discharge port 9a, an inner discharge port portion 9b, and an outer discharge port portion 9c. The discharge port 9 is formed on the main body 5 of the casing A on the side opposite to the side on which the suction port 8 is formed, and around the boss portion 7, the inner suction port portion It is formed in a substantially meniscus shape on the opposite side to 8b. Further, an outer discharge port portion 9c is formed along the outer periphery of the inner discharge port portion 9b.
[0016]
Similarly to the suction port 8, the discharge side partition portion 9d of the inner discharge port portion 9b and the outer discharge port portion 9c is formed as an arcuate wall. A discharge flow path 9a ₁ is formed from the discharge port 9a to the inner discharge port portion 9b and the outer discharge port portion 9c. The discharge port 9a and the discharge flow path 9a ₁ are portions shared by the inner discharge port portion 9b and the outer discharge port portion 9c, and both the inner discharge port portion 9b and the outer discharge port portion 9c are fluids to the discharge port 9a. And the fluid is sent out of the pump through the discharge flow path 9a ₁ .
[0017]
The discharge passage 9a ₁ passes through the outer discharge port portion 9c as shown in FIGS. 2 (A) and 2 (B). Further, the discharge-side partition portion 9d, the spaced at appropriate intervals in the intermediate position and, in its spaced-apart regions, the discharge flow channel 9a ₁ is positioned so as to intersect. The delivery of fluid from the inner discharge port portion 9b to the discharge port 9a are those to feed through the discharge flow path 9a ₁ from the separation area of the discharge-side partition portion 9d. The suction side partition 8d and the discharge side partition 9d are actually continuous on both the left and right sides.
[0018]
Further, as shown in FIGS. 2A and 2B, a common rotor guide step portion 10 is formed in each of the suction side partition portion 8d and the discharge side partition portion 9d. In particular, the rotor guide step 10 stabilizes the rotation of the intermediate rotor 2. This is because the inner rotor 1 is pivotally supported by the drive shaft, and the outer rotor 3 is supported by the side surface portion 6b of the rotor chamber 6, and the intermediate rotor 2 together with these also ensures the stable rotation. A guide step 10 is formed. 4B, 4C, and 4D show cross-sectional shapes of the casing A in FIG.
[0019]
The rotor guide step portion 10 is formed in the suction side partition portion 8d and the discharge side partition portion 9d, and is provided with a step so as to form a lower surface on each. The intermediate rotor 2 is formed with a guide cylindrical portion 2c that is a concentric circle. The guide cylindrical portion 2 c is a portion protruding outward from the side surface of the intermediate rotor 2, and is accommodated so that the guide cylindrical portion 2 c is guided by the rotor guide step portion 10. In the inner rotor 1, the intermediate rotor 2, and the outer rotor 3, the number of rotor teeth is variously set by combining even and odd numbers in terms of the number of teeth.
[0020]
Next, FIG. 5A shows the position of the end of the outer suction port portion 8c changed. In the inner suction port part 8b and the outer discharge port portion 9c, communicating with the mutual and inner gap chamber S ₁ communicating to the inner suction port part 8b, to the outer air gap chamber S ₂ is the outer suction port part 8c The end positions of the inner suction port portion 8b and the outer suction port portion 8c can be set so as to cause a time difference. FIG. 5B shows the position of the end of the outer discharge port 9c changed. This is also the communication to the inner gap chamber S ₁ is the inner discharge port portion 9b, the outer air gap chamber S ₂ is the inner discharge port portion so that the communication time difference with each other is caused to the outer discharge port portion 9c The end positions of 9b and the outer discharge port portion 9c are set. This is intended to prevent the vibration of the casing A by disturbing the rhythm of the pulsation of the rotor during pump operation.
[0021]
Next, an embodiment including a plurality of the intermediate rotors 2 exists. In this embodiment, a plurality of intermediate rotors 2 and 2 are provided between an inner rotor 1 and an outer rotor 2 as shown in FIG. In the casing A, an intermediate suction port portion 8e is formed between the inner suction port portion 8b and the outer suction port portion 8c. Further, an intermediate discharge port 9e is formed between the inner discharge port portion 9b and the outer discharge port portion 9c. Further, intermediate gap chambers S ₃ , S ₃ ,... Exist between the inner gap chambers S ₁ , S ₁ ,... And the outer gap chambers S ₂ , S ₂ ,. .
[0022]
There is also an embodiment in which the inner void chamber S ₁ and the outer void chamber S ₂ have different volumes. In this way, the inner space chambers S ₁ , S ₁ ,... And the outer space chambers S ₂ , S ₂ ,... Differ in the amount of fluid sucked and discharged, thereby reducing the pulsation rhythm. It can be ruled, and as a result, vibration and noise of the casing A can be prevented.
[0023]
【The invention's effect】
The invention of claim 1 includes a trochoid rotor group comprising an inner rotor 1, an intermediate rotor 2, and an outer rotor 3, an inner suction port portion 8b and an outer suction port portion 8c in which a suction side partition portion 8d is formed. A suction port 8 composed of the inner suction port portion 8b and the outer suction port portion 8c sharing the suction port 8a, an inner discharge port portion 9b and an outer discharge port portion 9c in which a discharge side partition portion 9d is formed, A casing A having a partition portion 11 between a discharge port 9 including the inner discharge port portion 9b and the outer discharge port portion 9c sharing the discharge port 9a, and in the trochoidal rotor group, the inner rotor 1 and the inner gap chambers S ₁ , S ₁ ,... Formed by the intermediate rotor 2 are divided into the suction side partitions arranged via the partition portion 11. The suction port 8 sharing the suction port 8a and the inner suction port portion 8b in which the discharge portion 8d is formed, and the inner discharge port portion 9b and the discharge port 9a in which the discharge side partition portion 9d is formed are shared. The outer space chambers S ₂ , S ₂ ,... Formed by the intermediate rotor 2 and the outer rotor 3 communicate with the discharge port 9, and the suction side partition portion 8 d is formed through the partition portion 11. The suction port 8 that shares the outer suction port portion 8c and the suction port 8a, and the outer discharge port portion 9c in which the discharge-side partition portion 9d is formed and the discharge port 9 that shares the discharge port 9a communicate with each other. The trochoid pump is composed of three or more rotors having a trochoidal tooth profile. It is possible to deliver fluid.
[0024]
In other words, the inner space chambers S ₁ , S ₁ ,... And the outer space chambers S ₂ , S ₂ ,... Are formed by a trochoidal rotor group including the inner rotor 1, the intermediate rotor 2, and the outer rotor 3. S ₁ , S ₁ ,... Communicate with the inner suction port portion 8 b and the inner discharge port portion 9 b disposed via the partition portion 11, and the outer gap chambers S ₂ , S ₂ ,. Since the outer suction port portion 8c and the outer discharge port portion 9c arranged via the portion 11 communicate with each other, the volumetric efficiency of the pump formed of one casing can be improved. Furthermore, since the inner suction port portion 8b and the outer suction port portion 8c share the suction port 8a, and the inner discharge port portion 9b and the outer discharge port portion 9c share the discharge port 9a, they are provided inside and outside. Two or more fluids in the void chambers S ₁ and S ₂ can be pumped together in the flow path in the pump. In addition, when the pump casing is molded by die casting, the suction and discharge ports are formed in the same direction at the start and end of the suction and discharge ports on the inner side and the outer side. .
[0025]
A second aspect of the present invention, in claim 1, and the communication of the inner air gap chamber S ₁ is to the inner suction port part 8b, the mutual communication with the outer air gap chamber S ₂ is to the outer suction port part 8c By adopting a trochoid pump in which end positions of the inner suction port portion 8b and the outer suction port portion 8c are set so as to cause a time difference, on the suction side, the outer suction port portion 8c and the inner suction port portion 8b are compared. To minimize the vibration of the casing A by shifting the fluid suction timing of the inner gap chambers S ₁ , S ₁ ,... And the outer gap chambers S ₂ , S ₂ ,. it can.
[0026]
A third aspect of the present invention, in claim 1, and the communication of the inner air gap chamber S ₁ is to the inner discharge port portion 9b, the mutual communication with the outer air gap chamber S ₂ is to the outer discharge port portion 9c By adopting a trochoid pump in which end positions of the inner discharge port portion 9b and the outer discharge port portion 9c are set so as to cause a time difference, on the suction side, the outer discharge port portion 9c and the inner discharge port portion 9b To minimize the vibration of the casing A by shifting the timing of fluid discharge between the inner gap chambers S ₁ , S ₁ ,... And the outer gap chambers S ₂ , S ₂ ,. it can.
[0027]
A fourth aspect of the present invention, in claim 1, 2 or 3, the volume of the inner air gap chamber S ₁ and the outer gap chamber S ₂ is by having a trochoid pump obtained by the different inner void chamber S _1, S The amount of suction and discharge of fluids ₁ ,... Is different from the amount of fluid suction and discharges of the outer gap chambers S ₂ , S ₂ ,..., Thereby suppressing pulsation.
[0028]
According to a fifth aspect of the invention, in the first, second, third, or fourth aspect, the intermediate rotor 2 is a trochoid pump configured as a plurality of stages, so that a larger amount of fluid can be delivered.
[Brief description of the drawings]
FIG. 1A is a front view of a state where an inner rotor and an outer rotor are engaged with each other in the present invention. FIG. 1B is a cross-sectional view taken along the line X ₁ -X _{1 in} FIG. FIG. 3A is a front view of an inner rotor, FIG. 3B is a cross-sectional view of FIG. 3A, and FIG. 3C is a front view of an intermediate rotor. ) Is a cross-sectional view of (C), (E) is a front view of the outer rotor, (F) is a cross-sectional view of (E), [FIG. 4] (A) is a plan view of the casing, (B) is X ₂ − of (A). X ₂ cross-sectional view taken (C) is X ₃ -X ₃ arrow sectional view (D) is X ₄ -X ₄ sectional view taken along the line [5] (a) is a casing (a) of (a) FIG. 6B is a plan view in which the end position of the outer suction port portion is changed. FIG. 6B is a plan view in which the end position of the outer discharge port portion of the casing is changed. Plan view of the embodiment to (B) is a plan view of the casing (A) DESCRIPTION OF REFERENCE NUMERALS
A ... casing 1 ... inner rotor 2 ... intermediate rotor 3 ... outer rotor 8 ... suction port 8a ... suction port 8b ... inner suction port portion 8c ... outer suction port portion 9 ... discharge port 9a ... discharge port 9b ... inner discharge port portion 9c ... Outside discharge port part S ₁ ... Inside void chamber S ₂ ... Outside void chamber

Claims (5)

Wherein an inner rotor, an intermediate rotor, and trochoidal rotor group consisting of the outer rotor, and an outer suction port part inner suction port part suction side partition part is formed, and the inner suction port part that shares an inlet consists of a suction port consisting of an outer suction port part, and the discharge-side inner discharge port portion partitioning portion is formed with the outer discharge port portion, the inner discharge port portion to share the discharge port and said outer discharge port portion The suction side partition is formed of a casing provided with a partition portion between the discharge port, and the inner space chamber group formed by the inner rotor and the intermediate rotor in the trochoid rotor group is disposed via the partition portion. A suction port sharing the suction port and the discharge side partitioning portion are formed. Through the discharge ports and communicating that share inner discharge port portion and the discharge port are, the intermediate rotor and the outer air gap chamber group formed by the outer rotor the inlet side partition part disposed through the partition portion is formed A suction port that shares the suction port with the outer suction port portion, and a discharge port that shares the discharge port with the outer discharge port portion in which the discharge-side partition portion is formed. Trochoid pump.   2. The inner suction port portion and the outer suction port according to claim 1, wherein the inner space chamber communicates with the inner suction port portion and the outer space chamber communicates with the outer suction port portion. A trochoid pump characterized by setting an end position of a port portion.   2. The inner discharge port portion and the outer discharge port according to claim 1, wherein the inner void chamber communicates with the inner discharge port portion and the outer void chamber communicates with the outer discharge port portion. A trochoid pump characterized by setting an end position of a port portion.   4. The trochoid pump according to claim 1, wherein the inner cavity chamber and the outer cavity chamber have different volumes.   5. The trochoid pump according to claim 1, 2, 3, or 4, wherein the intermediate rotor is configured as a plurality of stages.

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