JP3363472B2 - Double vane pump - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual vane pump in which a front pump and a rear pump are connected in a body. 2. Description of the Related Art In a conventional example shown in FIGS. 7 to 9, a cover 2 is fixed to one side of a body 1 and a pump shaft 3 is rotatably supported by the body 1 and the cover 2. . The body 1 as described above, by the center plate 4 in the middle is provided with a front pump P ₁ and Riyaponpu P ₂ on both sides. These two pumps P ₁ and P ₂
Rotors 5 and 6 that rotate integrally with the pump shaft 3, a plurality of vanes 7 and 8 radially provided on the rotors 5 and 6,
The cam rings 9 and 10 guide the vanes 7 and 8. The cam rings 9, 10 and the center plate 4 are fixed by positioning pins 11, 12, as is clear from FIG. Further, a concave portion is formed on the inner surface of the body 1 and the cover 2 on the contact surface side with the two cam rings 9 and 10, and the side plates 13 and 14 are fitted into the concave portion. As shown in FIG. 7, the center plate 4 has the same vertical length as the cam rings 9 and 10 in the Y-axis direction, while the center plate 4 has a horizontal X-axis direction as shown in FIG. The length in the direction is shorter than the cam rings 9 and 10. Moreover, each of the center plate 4 and the cam rings 9 and 10 keeps an interval with the body 1. [0004] As shown in FIG. 9, the gaps on both sides of the center plate 4 and the cam rings 9, 10 are defined as branch passages 15, 16, and the gaps between the apexes thereof are determined by the front pump P ₁ and the rear pump P ₂ The common flow path 17 of FIG. As is clear from FIGS. 7 and 9, the common flow path 17 is provided in the supply port 1 formed in the body 1.
8. The excess flow port 20 communicating with the flow control valve 19 provided inside the body 1 and the excess flow port 22 of the flow control valve 21 provided in the cover 2 communicate with each other. Further, Oite to the X-axis direction is to shorten the length of the center plate 4, and the inside of the cam ring 9 and 10 configured to open the branch passage 15 side. Further, the body 1 and the side plate 1 in the X-axis direction
3, the cover 2 and the side plate 14 combine to form the recess 2
3 and 24, the cam rings 9 and 10 also have branch passages 15 and 16 through the recesses 23 and 24.
Open to the side. That is, both sides of the cam rings 9 and 10 in the X-axis direction are on the side of the branch passages 15 and 16.
The pumps are opened , and the open portions are used as suction passages 25 and 26 for both pumps P ₁ and P ₂ . [0006] the body 1, to form a discharge port 27 of the front pump P _1, the discharge port 2
Numeral 7 communicates, via a flow control valve 19, with the surplus flow port 20 and a control flow port (not shown) connected to the actuator side. And the discharge port 27 is
Communicates with the discharge side of the front pump P ₁ through the communication passage 28 formed in the side plate 13. Also, the cover 2, to form a discharge port 29 of Riyaponpu P _2, the discharge port 29 via the flow control valve 21, and the control flow ports (not shown) to communicate with the surplus flow port 22 and the actuator side Is communicated to. The discharge port 29 is communicated with the discharge side of the Riyaponpu P ₂ via the communication passage 30 formed in the side plate 14. In the conventional dual vane pump constructed as described above, when the pump shaft 3 is rotated, the two pumps P ₁ , P ₂
Is driven to rotate. With this drive, supply port 1
8 through the common flow path 17 and the branch fluid 1
Divide into 5 and 16. The branch passages 15 and 16
Pumps P ₁ , P
₂ sucked. The pressure fluid discharged from the pumps P ₁ , P ₂ passes through communication passages 28, 30 formed in the side plates 13, 14, and flows through the flow control valves 19, 2.
Flow into 1. The flow control valves 19 and 21 supply the control flow to an actuator (not shown), and return an excess flow equal to or higher than the control flow to the common flow path 17 via the excess flow ports 20 and 22. Then, the working fluid that has merged in the common flow path 17 is split again in the branch passages 15 and 16, and
Both pumps P ₁ and P ₂ are sucked. The conventional dual vane pump as described above has a problem that cavitation occurs for the following reasons. That is, the surplus flow rate equal to or more than the set flow rate determined by the flow control valves 19 and 21 is
Reflux flows into the common flow path 17 through the excess flow ports 20 and 22. At this time, since the fluid refluxed from the surplus flow port 20 side and the surplus flow port 22 side directly collide with each other in the common flow path 17 and merges, the flow of the recirculated fluid is disturbed. This turbulence causes a sudden pressure drop,
Cause cavitation. Thus, the conventional 2
In the continuous-type vane pump, the recirculated fluids directly collide with each other in the common flow path and merge. Therefore, cavitation occurs in the common flow path, and there is a problem that the pump cannot be rotated at high speed. Further, when the rotation of the pump is increased, there is a problem that the durability of the pump is reduced due to the effect of cavitation. An object of the present invention is to provide a dual vane pump which prevents cavitation in a common flow passage, rotates the pump at high speed, and prevents the durability of the pump from decreasing when the rotation is increased. It is to be. In order to solve the above-mentioned problems, according to the present invention, a front pump and a rear pump are provided on both sides of a center plate provided in a body. And a vane, with a space provided between the center plate and the body to form branch passages on both sides of the center plate, and a branch portion of the branch passage serving as a common flow passage for the front pump and the rear pump. The branch passage and the common supply port of both pumps are communicated with each other through the passage, and each of the branch passages is communicated with the suction flow passages of the front pump and the rear pump. The discharge flow paths of both pumps are communicated with each other. In duplicate vane pump was configured to circulate, the center plate positioned in the common flow path side, comprises a protrusion for partitioning the common flow path to the front pump side and Riyaponpu side, this protrusion, the common In the flow path,
While restricting the fluid circulated from the front pump side and the fluid circulated from the rear pump side from directly hitting each other,
Both sides or one of the side surfaces of this protruding piece are formed into a mountain shape with a concave curved surface, and the fluid that hits the side surface is removed by two.
And the divided fluid is guided to the branch passage by a concave curved surface. With the above construction, the interior of the common flow path is divided into a front pump side and a rear pump side by a projecting piece formed on the center plate. Therefore, in this common channel,
Fluids flowing back from the front pump side and the rear pump side are blocked by the projections of the center plate and do not directly collide. Therefore, in the common flow path, there is no flow disturbance caused by the direct contact between the recirculated fluids. FIGS. 1 to 6 show an embodiment of the present invention. The same reference numerals are used for the components shown in the conventional example, and the detailed description is omitted. Further, in this embodiment, as is apparent from FIGS. 1 to 5, the shape of the center plate 4 is different from that of the conventional example, and the other components are exactly the same as the conventional example. A projecting piece 31 is formed on the center plate 4 in the Y-axis direction in FIG.
This protruding piece 31 moves the front pump P
It is shaped to partition into a _first surplus flow port 22 side of the surplus flow port 20 side and the Riyaponpu P _2. 3 to 5 show the detailed shapes. This figure 3
5 are a center plate 4 and a projection 3 formed thereon.
FIG. 2 is a top view, a side view, and a front view of FIG. 1, and FIG. 2 shows a state in which the center plate 4 provided with the protruding pieces 31 is incorporated in a pump body. The protruding piece 31 formed on the center plate 4 in this way allows the surplus flow port 20,
The fluid flowing into the common channel 17 from 22 is not directly collided because it is blocked by the projection 31 of the center plate 4. In this embodiment, the projecting piece 31 is used.
In a state where a gap is provided between
Although the inside is partitioned, the present invention also includes one in which the above-mentioned gap is not provided. As shown in FIG. 3, the side surface of the projecting piece 31 on the side of the surplus flow port 20 has a slope formed as a concave surface.
And Yamagata, has a side surface of the surplus flow port 22 side to the plane
You . By forming the side surface of the protruding piece 31 in such a shape, it is possible to smoothly change the direction of the flow of the fluid flowing into the common flow channel 17 at reflux. In addition , the excess flow
On the port 20 side, the circulated fluid is divided into two
And diverted the fluid by a concave curved surface.
It can also be guided smoothly to the branch passages 15 and 16. What
All, the shape of the side surface of the protrusion 31, as shown in FIG. 6 may be the mountain <br/> shape both sides was concave surface of the surplus flow port 20, 22. As described above, the protruding piece 31 formed on the center plate 4 and the concave curved shape provided on the side face of the protruding piece 31 do not cause the fluid circulating in the common flow path 17 to directly collide with each other. Smooth flow direction to branch passage 1
Since the flow is changed to the sides 5 and 16 , the flow of the fluid circulated in the common flow path 17 is not disturbed. Since the flow of the recirculated fluid is not disturbed, a rapid pressure drop does not occur in the common flow channel 17. Therefore, since cavitation does not occur, the recirculated fluid is smoothly supplied to both pumps P ₁ and P ₂ through the branch passages 15 and 16, and the pumps P ₁ and P ₂ can be rotated at high speed. With
There is no loss in the durability of the pumps P ₁ and P ₂ when the rotation is increased. Since the supply flow path is divided into the front pump side and the rear pump side by the protruding pieces formed on the center plate, the fluid circulating in the supply flow path does not directly collide with each other. . Also, either side of the protruding piece or any one
The other side is a mountain shape with a concave curved surface,
While diverting the fluid that hit the side in two directions,
This diverted fluid is summed into the branch passage by the concave curved surface.
You can also lead to Therefore, in the common flow path, the flow of the circulated fluid does not become turbulent, so that cavitation does not occur and the pump can be rotated at high speed. Further, since cavitation does not occur, even if the rotation of the pump is increased, the durability of the pump is not reduced.

[Brief description of the drawings] FIG. 1 is a longitudinal sectional view of an embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a top view of a component of the embodiment. FIG. 4 is a side view of a component of the embodiment. FIG. 5 is a front view of components of the embodiment. FIG. 6 is a top view of a component of the embodiment. FIG. 7 is a longitudinal sectional view of a conventional example. FIG. 8 is a horizontal sectional view of a conventional example. 9 is a sectional view taken along line IX-IX of FIG. [Explanation of symbols] 1 body 4 Center plate 5 Rotor 6 rotor 7 Vane 8 Vane 9 Cam Ring 15 branch passage 16 branch passage 17 Common flow path 18 Supply port 25 SuctionChannel 31 projection P₁    Front pump P₂    Rear pump

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-26390 (JP, A) JP-A 63-69790 (JP, U) JP-A 1-152085 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) F04C 11/00 F04C 2/344 F04C 15/00

Claims (1)

(57) [Claim 1] A front pump and a rear pump are provided on both sides of a center plate provided in a body.
These pumps are composed of a cam ring, a rotor and a vane, form a branch passage on both sides of the center plate by providing an interval between the center plate and the body, and a branch portion of the branch passage is shared by the front pump and the rear pump. A flow path, and the branch path and the supply port common to both pumps are communicated through this common flow path, and each of the branch paths is communicated with the suction flow path of the front pump and the rear pump. a flow control valve provided respectively with the discharge flow path of the two pumps is communicated, the surplus flow rate larger than a predetermined flow rate determined by the flow rate control valve in duplicate vane pump was configured to circulate to the common channel, the common a center plate positioned in the flow path side, comprises a protrusion for partitioning the common flow path to the front pump side and Riyaponpu side, the projecting piece Therefore, in the common flow path, the fluid circulated from the front pump side and the fluid circulated from the rear pump side are prevented from directly colliding with each other. A dual vane pump having a curved mountain shape, in which fluid that collides with a side surface is diverted in two directions, and the diverted fluid is guided to the branch passage by a concave curved surface.