JP4821672B2 - Vane pump - Google Patents

Description

  The present invention relates to a vane pump.

The conventional vane pump 1 houses the rotor 3 in an eccentric position of the pump chamber 2 formed in the casing 10 as shown in FIG. 8, and forms a plurality of vane grooves 19 extending radially in the rotor 3, and the tip of each vane groove 19 has a tip. the vanes 4 which is in sliding contact with the inner circumferential surface 2a of the pump chamber 2 is provided slidably in the rotor 3 La dialkyl direction. Further, a suction port 20 and a discharge port 21 are provided on the inner peripheral surface of the pump chamber 2, and a suction path 6 and a discharge path 7 communicating with the suction port 20 and the discharge port 21 are formed in the casing 10. The inlet part of the suction path 6 and the outlet part of the discharge path 7 are constituted by a connecting pipe part protruding from the outer surface of the casing 10 so that a pipe such as a hose (not shown) can be connected. In the figure, reference numeral 26 denotes a spring material provided in the vane groove 19.

When driven to rotate the rotor 3, each vane 4 the tip portion of the rotor 3 La dialkyl direction slides outward each vane 4 is in sliding contact with the inner circumferential surface 2a of the pump chamber 2 by the action of the centrifugal force of the rotor 3, As a result, the volume of the working chamber 5 surrounded by the inner surface of the pump chamber 2, the outer peripheral surface of the rotor 3, and the vane 4 changes in size, and the working fluid is sucked from the suction port 20 through the working chamber 5 and the discharge port. The working fluid is discharged from 21.

Incidentally, the suction port 20 and discharge port 21 is preferably formed at a position shifted from the vane 4 in the rotor 3 scan last direction in the inner circumferential surface 2a of the pump chamber 2. The reason for this is that when the vane 4 is in a position corresponding to the suction port 20 and the discharge port 21 in the circumferential direction of the pump chamber 2, the contact area of the vane 4 with respect to the inner peripheral surface 2a of the pump chamber 2 is secured. This is because the suction and discharge can be performed efficiently, and since the suction port 20 and the discharge port 21 can be smoothly formed on the inner peripheral surface 2a on which the vane 4 slides, wear of the vane 4 can be prevented.

  Further, the suction path 6 and the discharge path 7 need to have a constant cross-sectional area over the entire length in the flow direction including the suction port 20 and the discharge port 21 in order to reduce flow path resistance. The cross-sectional area was made constant by having the same cross-sectional shape over the entire length in the direction. The cross-sectional shapes of the suction path 6 including the suction port 20 and the discharge path 7 including the discharge port 21 are determined by the cross-sections of the inlet portion and the outlet portion to which the pipe is connected.

Without hindrance to thinning of the casing 10 in the case of forming where the discharge passage 7 and the discharge port 21 to both the rotor 3 La dialkyl overlaps with the pump chamber 2 in the direction position, the vane the discharge port 12 as described above 4 when placed in a position shifted to the rotor 3 scan last direction only dimension of the discharge opening 21 will be the casing 10 is thicker, the discharge passage 7 and the discharge port 21 in order to particularly reduce the flow resistance When formed in the same cross-sectional shape as the outlet portion, the casing 10 becomes thicker by the diameter of the outlet portion of the discharge path 7, which hinders the thickness reduction of the casing 10.
Japanese Utility Model Publication No.59-154881

The present invention was invented in view of the above conventional problems, a discharge port disposed from the vane in the inner peripheral surface of the pump chamber at a position offset in the rotor scan last direction, the inner periphery of the pump chamber of the vane Provided is a vane pump that can efficiently discharge a working fluid by securing a contact area with respect to a surface, prevents vane wear, and has a thin casing.

In order to solve the above problems, a vane pump according to the present invention includes a pump chamber 2 formed in a casing 10, a rotor 3 housed in the pump chamber 2, a plurality of circumferentially arranged rotors 3, and a tip of the pump chamber 2. And a working chamber 5 surrounded by the inner surface of the pump chamber 2, the inner surface of the pump chamber 2, the outer peripheral surface of the rotor 3, and the vane 4, the volume of which is changed by the rotational driving of the rotor 3. A suction port 20 that communicates with the working chamber 5 in the volume expansion process and a discharge port 21 that communicates with the working chamber 5 in the volume reduction process are formed on the inner peripheral surface 2a of the chamber 2, and the suction port 20 and the discharge port 21 are formed in the rotor 3 radial. arranged on one side shifted from the vane 4 in the rotor 3 scan last direction so as not to overlap with each vane 4 when viewed from the direction, in communication with the suction passage 6 which communicates with the intake port 20 into the casing 10 in the discharge port 21 discharging Sutra 7 to form a, these suction path 6 and the discharge passage 7 is formed at a position that overlaps with the pump chamber 2 in the rotor 3 La dialkyl direction, the dimension of the rotor 3 the thrust direction of the inlet 20 of the inlet portion of the suction passage 6 longer than the inlet portion diameter of the pump chamber 2 of the inner circumferential surface 2a dimension the suction passage 6 along the the suction inlet 20 as well as shorter than the diameter, the dimensions of the rotor 3 scan last direction of the discharge port 21 Is made shorter than the diameter of the outlet part of the discharge path 7 and the dimension of the discharge port 21 in the direction along the inner peripheral surface 2a of the pump chamber 2 is made longer than the diameter of the outlet part of the discharge path 7. Features. In this way, the suction port 20 and the discharge port 21 are arranged on one side displaced from each vane 4 in the rotor 3 thrust direction so as not to overlap with each vane 4 when viewed from the radial direction of the rotor 3. The contact area of the vane 4 with respect to the inner peripheral surface 2a of the pump chamber 2 can be secured and the working fluid can be efficiently sucked and discharged when it is at a position corresponding to the suction port 20 and the discharge port 21 in the circumferential direction. There is an effect that wear of 4 can be prevented . With addition of吸経path 6 and the discharge passage 7 is formed at a position that overlaps with the pump chamber 2 in the rotor 3 La dialkyl direction, shorter than the diameter of the inlet portion of the suction passage 6 the dimensions of the rotor 3 the thrust direction of the suction port 20 absorbing the dimension along the inner circumferential surface 2a of the pump chamber 2 of the inlet 20 and longer than the diameter of the inlet portion of the suction passage 6, the dimensions of the rotor 3 scan last direction of the discharge port 21 of the discharge passage 7 outlet The thickness dimension of the casing 10 (rotor) is made shorter by making the dimension of the discharge port 21 in the direction along the inner peripheral surface 2 a longer than the diameter of the inlet part of the discharge path 7. 3 scan last dimensions) to be short and can be sufficiently secured the cross-sectional area of the suction port 20 and discharge port 21.

The upstream end of the discharge passage 7 is provided with an inner surface 43 opposed to the discharge port 21, and gradually lengthened enough to go the distance between the inner side surface 43 and the discharge port 21 in front of the rotor 3 Rotation Direction It is preferable to do. The working fluid flowing into the discharge path 7 can be guided by the inner side surface 43.

  The cross-sectional area of the flow path constituted by the discharge flow path 7 and the discharge port 21 is preferably constant over the entire length in the flow direction of the working fluid. The working fluid in the pump chamber 2 can be derived more smoothly.

In the invention according to claim 1, by arranging the one side shifted from each vane in the rotor scan last direction to look at the inlet and the discharge port from the rotor radial direction do not overlap with each vane, efficiently sucking the working fluid ・ Effects such as discharge can be obtained, the casing can be made thin, and the cross-sectional area of the suction port and discharge port can be sufficiently secured to reduce the flow resistance at the suction port and discharge port, thereby reducing the working fluid. The pump chamber can be smoothly introduced into the pump chamber through the suction port, and the working fluid in the pump chamber can be smoothly led out through the discharge port.

  In the invention according to claim 2, in addition to the effect of the invention according to claim 1, the working fluid from the pump chamber can be derived more smoothly.

  In the invention according to claim 3, in addition to the effect of the invention according to claim 1 or 2, the working fluid from the pump chamber can be derived more smoothly.

Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. A vane pump 1 according to an example of the present embodiment shown in FIGS. 1 to 7 stores a rotor 3 eccentrically in a pump chamber 2 formed in a casing 10, and a tip is slidably contacted with an inner peripheral surface 2 a of the pump chamber 2. A plurality of vanes 4 are provided on the rotor 3, and the volume of the working chamber 5 surrounded by the inner surface of the pump chamber 2, the outer peripheral surface of the rotor 3, and the vanes 4 is changed in size by rotating the rotor 3 by the stator 23. Thus, the working fluid from the suction port 20 is discharged from the discharge port 21 through the working chamber 5. In the following it will be described one of the rotor 3 scan last direction (axial direction of the rotor 3) above, the other opposite side as downward.

  As shown in FIG. 3, the casing 10 that accommodates the rotor 3 has a substantially rectangular shape in plan view, and is formed by combining an upper case 11 positioned above and a lower case 12 positioned below. In the figure, reference numeral 14 denotes a fastener hole for fastening the upper case 11 and the lower case 12 together.

  The upper case 11 is formed with an upper recess 15 that is recessed upward from the mating surface with the lower case 12, and the upper case 11 is recessed downward from the mating surface with the upper case 11. A lower recess 16 communicating with 15 is formed. A fitting portion 24 projects from the central portion of the bottom surface of the upper recess 15, and notches 24 a are formed at two locations 180 degrees apart in the circumferential direction of the outer peripheral portion of the fitting portion 24. An annular ring member 17 is fitted into the upper recess 15, and the fitting portion 24 is fitted into the upper end portion of the central hole 17 a of the ring member 17. Thus, the pump chamber 2 which accommodates the rotor 3 is formed by combining the upper recess 15 and the lower recess 16 into which the ring material 17 is inserted, that is, the pump chamber 2 includes the lower surface of the fitting portion 24. The bottom surface of the upper recess 15, the inner peripheral surface of the ring material 17, and the inner surface of the lower recess 16 are configured.

  The rotor 3 is formed in a circular shape in plan view, and is composed of an upper rotor body 8 and a magnet portion 22 (see FIG. 7) composed of a lower permanent magnet. As shown in FIG. 1, the rotor 3 has an outer peripheral surface 8 a of the rotor main body 8 that faces the inner peripheral surface 2 a of the pump chamber 2 (the inner peripheral surface of the ring member 17), and serves as one thrust surface of the rotor main body 8. The upper surface is accommodated in the pump chamber 2 so as to face the inner bottom surface of the pump chamber 2 (that is, the bottom surface of the upper recess 15 including the fitting portion 24).

Plural rows of vane groove 19 extending in the rotor 3 La dialkyl direction on the upper surface of circular shape in plan view of the rotor body 8 at equal intervals in the circumferential direction Yes formed radially (Article 4 in this example), each vane groove 19 rotor It opens from the outer peripheral surface 8 a of the main body 8. Each the vane groove 19 Yes and slidably accommodating the vanes 4 having a rectangular parallelepiped shape in the rotor 3 La dialkyl direction, thereby front portion of each vane 4 is freely and out from the outer peripheral surface 8a of the rotor body 8 . The top surface of each vane 4 faces the bottom surface of the upper recess 15.

Role on the outer circumferential surface of the rotor body 8 Yes and arranged a number of teeth 25 projecting outwardly of the rotor 3 La dialkyl direction in the circumferential direction, these teeth 25 to increase the pressure in the working chamber at the time of ejection. Also the lower end of the rotor body 8 Yes and circumferentially of flange portion 27 protruding outward of the rotor 3 La dialkyl direction than the tooth portion 25, the outer peripheral portion of the flange portion 27 as shown in FIG. 7 (a) It protrudes outward from the inner peripheral surface of the ring member 17 and faces the lower surface of the ring member 17. The magnet portion 22 is housed in the lower recess 16. A shaft 32 protrudes upward from the bottom surface of the lower recess 16, and the shaft 32 is inserted into the center of the rotor 3 to rotatably support the rotor 3.

  A suction port 20 for drawing the working fluid into the working chamber 5 and a discharge port 21 for discharging the working fluid from the working chamber 5 are formed at the upper end of the inner circumferential surface 2 a of the pump chamber 2 constituted by the inner circumferential surface of the ring material 17. is doing. The suction port 20 and the discharge port 21 are formed at positions facing each other on the inner peripheral surface 2 a of the pump chamber 2, and communicate with each notch 24 a formed in the fitting portion 24. The suction port 20 and the discharge port 21 are located at the same level and are located above the vanes 4 provided in the rotor 3. As a result, when the vane 4 is in a position corresponding to the suction port 20 and the discharge port 21 in the circumferential direction of the pump chamber 2, the contact area of the vane 4 with respect to the inner peripheral surface 2a of the pump chamber 2 is ensured and the working fluid is efficiently used. Suction / discharge can be performed well and wear of the vanes 4 can be prevented. Further, a suction path 6 and a discharge path 7 communicating with the suction port 20 and the discharge port 21 are formed in the casing 10.

  As shown in FIG. 2, a stator housing recess 34 is formed on the lower surface of the lower case 12, and the stator 23 is disposed in the stator housing recess 34. Then, by rotating the magnet portion 22 through the casing 10 by the electromagnetic force of the stator 23 arranged outside the pump chamber 2, the rotor 3 in the pump chamber 2 is moved to the arrow a in FIG. It can be rotated in the direction shown.

  When the rotor 3 is rotationally driven by the stator 23, each vane 4 receives an action of centrifugal force due to the rotation of the rotor 3 and projects outward from the outer peripheral surface 8 a of the rotor body 8, and its tip is pumped The inner surface 2 a of the chamber 2 is slidably contacted. At this time, the pump chamber 2 is formed with a plurality of working chambers 5 surrounded by the inner surface (the inner peripheral surface 2a and the inner bottom surface) of the pump chamber 2, the outer peripheral surface 8a of the rotor body 8, the flange portion 27, and the vane 4. The Since the rotor main body 8 is in an eccentric position of the pump chamber 2 formed inside the ring material 17, the inner peripheral surface 2 a of the pump chamber 2 (the inner peripheral surface of the ring material 17) and the outer peripheral surface 8 a of the rotor main body 8. The distance varies depending on the rotational position of the rotor 3 and the amount of protrusion of the vane 4 from the rotor 3 also varies depending on the rotational position of the rotor 3. By rotating the rotor 3, each working chamber 5 rotates in the rotational direction of the rotor 3. The volume is changed to large or small while moving to. That is, the volume of each working chamber 5 increases with the rotation of the rotor 3 when it is in a position communicating with the suction port 20, and the volume decreases with the rotation of the rotor 3 when it is in a position communicating with the discharge port 21. Is done. Accordingly, when the rotor 3 is driven to rotate, the working fluid flows into the working chamber 5 communicating with the working fluid from the suction port 20 via the suction path 6, and is compressed from the discharge port 21 after being compressed in the working chamber 5. It is discharged through the discharge path 7 and functions as a pump.

  Hereinafter, the suction port 20 and the discharge port 21, and the suction path 6 and the discharge path 7 communicating with the suction port 20 and the discharge port 21 will be described in detail.

  The suction port 20 is formed along an inner peripheral edge portion of the upper surface of the ring member 17 and opens from an inner peripheral surface of the ring member 17, and an upper recess 15 that closes the upper side of the arc-shaped recess 26. It consists of a bottom. The suction port 20 is formed in a range of about ¼ of the circumferential direction of the ring member 17 and has an arc shape in plan view, and is formed in a horizontally long rectangular shape when viewed from the pump chamber 2 side. The discharge port 21 includes an opening edge portion on the pump chamber 2 side of the discharge-side flow channel 28 formed on the upper surface of the ring material 17 and a bottom surface of the upper recess 15 that closes the upper portion of the discharge port 21. The discharge port 21 is formed in a range of about ¼ of the circumferential direction of the ring member 17 and has an arc shape in plan view, and is formed in a horizontally long rectangular shape when viewed from the pump chamber 2 side. The width direction dimension of the suction port 20 and the discharge port 21 along the inner peripheral surface of the ring member 17 is shorter than the distance between the tips of the vanes 4 in the direction along the inner peripheral surface of the ring member 17. .

The suction path 6 and the discharge path 7 extend horizontally from the same side surface of the upper case 11 located closer to the discharge port 21 than the suction port 20 toward the rotor 3, and communicate with the suction port 20 and the discharge port 21. ing. Suction path 6 and the discharge passage 7 is formed in a position that overlaps with the pump chamber 2 both viewed from the rotor 3 La dialkyl direction.

  The suction path 6 includes a suction side upstream portion 6a and a suction side downstream portion 6b. The upstream suction side upstream portion 6 a is a hole formed in the upper case 11, and extends from the outer surface of the upper case 11 to the inner peripheral surface of the upper recess 15. The downstream suction side downstream portion 6 b closes the suction side flow channel 29 formed on the upper surface of the ring material 17 from the outer peripheral surface to the inner peripheral surface and the upper opening of the suction side flow channel 29. It consists of the bottom surface of the upper recess 15. An inlet portion which is an upstream end portion of the suction path 6 is configured by a circular inner surface of the suction side connection pipe portion 35 protruding from the outer surface of the upper case 11, and the suction side connection pipe portion 35 includes a hose or the like. The pipe on the suction side is connected.

As shown in FIG. 3B, the suction port 20 is located at the same level as the upper end portion of the suction side upstream portion 6a. The cross-sectional shape of the suction port 20 is different from the cross-sectional shape of the inlet portion of the suction path 6. Specifically, the cross section of the inlet 20, (dimensions shown in the FIG. 1 f) the rotor 3 scan last vertical in dimension (dimension shown by Medium FIG 3 (b) e) is the inlet portion of the suction passage 6 diameter The pump chamber 2 has a rectangular shape in which the dimension in the width direction in the direction along the inner peripheral surface 2a (the dimension indicated by d in FIG. 1) is longer than the diameter of the inlet portion of the suction path 6. Note that the dimension of the suction port 20 in the illustrated example in the width direction indicated by d in FIG.

  Since the vertical dimension of the suction port 20 is made shorter than the diameter of the inlet portion of the suction path 6 in this way, the vertical dimension of the casing 10 is reduced despite the formation of the suction port 20 on the inner peripheral surface of the pump chamber 2. Can be suppressed. In addition, since the dimension in the width direction of the suction port 20 is longer than the diameter of the inlet portion of the suction path 6, the cross-sectional area of the suction port 20 can be made substantially the same as the inlet portion of the suction path 6. Accordingly, the flow resistance at 20 can be reduced, and the working fluid flowing through the suction path 6 can be smoothly introduced into the pump chamber 2 via the suction port 20.

Also when in the state in which the end portion of the front of the rotor 3 Rotation direction of the working chamber 5 is communicated with the discharge port 21, the range indicated in the pump chamber 2 of the region (i.e. in Figure 1 the arrow b to the working chamber 5 is formed in a region which is formed, when the working fluid in the working chamber 5 is a pressure region the region) to be pressurized, inlet 20 is formed immediately before the press section in the rotor 3 times rotation direction. Note inlet 20, the vacuum areas, i.e. when in the state in which the end portion of the rear side is communicated with the discharge port 21 in the rotor 3 Rotation direction of the working chamber 5, the area of the pump chamber 2 in which the working chamber 5 is formed It is formed immediately after. Thus the inlet 20 by forming the rotor 3 Rotation direction until shortly before press section, can lengthen the dimension along the inner circumferential surface 2a to the pump chamber 2 of the inlet 20, the inlet 20 The thickness dimension of the casing 10 can be further shortened while ensuring a sufficient cross-sectional area.

The suction-side downstream portion 6b includes an upstream-side linear flow path portion 37 formed in a straight line shape in plan view and a downstream-side formed in an arc shape in plan view along the suction port 20 in the same manner as the suction-side upstream portion 6a. The arc-shaped channel portion 38 communicates with the upper end portion thereof facing the suction port 20. The rotor 3 times rotational direction of the front end portion of the bottom surface of the arcuate channel portion 38 as shown in FIG. 3 (i.e. downstream end) is located at the same level as the bottom surface of the suction port 20. The bottom surface of the suction-side downstream portion 6b has an upward slope 30 that gradually rises toward the downstream side. The bottom surface of the suction-side upstream portion 6a located below is smoothly continuous.

As shown in FIG. 1, the arc-shaped flow path portion 38 that constitutes the downstream end portion of the suction path 6 includes an inner side surface 40 that faces the suction port 20, and the inner side surface 40 includes the inner side surface 40 and the suction port 20. distance (dimensions shown in Figure 1 g) is inclined to become gradually shorter extent toward the front of the rotor 3 rotation direction between. Further, the bottom surface of the suction side downstream portion 6b constituted by the upward slope 30 gradually becomes deeper as it goes from the inner surface 40 side to the suction port 20 side as shown in FIGS. 7 (a) and 7 (b). It becomes the inclined surface 41 which becomes. As a result, the working fluid that has flowed into the arc-shaped channel portion 38 can be guided to the suction port 20 side at the bottom surface formed by the inner side surface 40 and the inclined surface 41 of the arc-shaped channel portion 38, and in addition, The working fluid can be introduced into the pump chamber 2 more smoothly at the bottom surface formed by the inclined surface 41 at the upstream side of the passage portion 38.

On the other hand, the discharge path 7 includes a discharge side upstream portion 7a and a discharge side downstream portion 7b. The upstream discharge side upstream portion 7a includes the discharge side flow channel 28 extending from the inner peripheral surface of the ring member 17 to the outer peripheral surface, and the bottom surface of the upper recess 15 that closes the upper opening of the discharge side flow channel 28. Consists of. The downstream discharge side downstream portion 7 b is formed by a hole formed in the upper case 11. The outlet portion serving as the downstream end portion of the discharge path 7 is constituted by an inner surface having a circular cross section of the discharge side connection pipe portion 36 protruding from the outer surface on which the suction side connection pipe portion 35 of the upper case 11 is formed. A discharge side pipe such as a hose is connected to the connection pipe portion 36. Here, the cross-sectional area of the outlet portion of the discharge passage 7 is smaller than the cross-sectional area of the inlet portion of the suction passage 6, but the center of the inlet portion of the outlet portion and the suction passage 6 of the discharge passage 7 in the rotor 3 scan Last Direction The position is in the same position and not shifted. Also projecting perpendicularly from the same outer side suction-side connection pipe 35 and the discharge-side connection pipe portion 36 positioned outside the rotor 3 La dialkyl direction of the upper case 11 together.

As shown in FIG. 2, the discharge port 21 is located at the same level as the upper end portion of the discharge-side downstream portion 7b. The cross-sectional shape of the discharge port 21 is different from the cross-sectional shape of the outlet portion of the discharge path 7. Specifically, the cross section of the discharge opening 21, than the rotor 3 scan last direction in dimension (height dimension shown in FIG. 2 i) of the outlet portion of the discharge passage 7 diameter (dimension indicated by h in FIG. 2) The pump chamber 2 has a rectangular shape in which the dimension in the direction along the inner peripheral surface 2 a (width dimension indicated by j in FIG. 1) is longer than the diameter of the outlet portion of the discharge path 7. 1 is longer than π × r, where r is the radius of the outlet of the discharge path 7.

  Thus, in this example, since the vertical dimension of the discharge port 21 is made shorter than the diameter of the outlet part of the discharge path 7, the discharge port 21 is formed on the inner peripheral surface of the pump chamber 2, but the casing 10 The vertical dimension can be suppressed. In addition, since the dimension in the width direction of the discharge port 21 is longer than the diameter of the outlet portion of the discharge path 7, the cross-sectional area of the discharge port 21 can be made the same as the outlet portion of the discharge path 7. Thus, the working fluid in the pump chamber 2 can be smoothly led out through the discharge port 21.

As shown in FIG. 2, the bottom surface of the discharge-side upstream portion 7 a has a downward slope 42 that gradually slopes downward toward the downstream side, and the bottom surface of the discharge port 21 through the downward slope 42 formed in the discharge path 7. And the bottom surface of the discharge-side upstream portion 7a located below is smoothly continuous. The FIGS. 6 (a) and a flow path in the discharge port 21 and the discharge-side upstream portion 7a as shown in FIG. 6 (b), the rotor 3 scan last in the width direction as viewed from the dimension (in the figure k The dimension shown in the drawing is gradually shortened toward the downstream side, whereby the cross-sectional area of the flow path constituted by the discharge port 21 and the discharge side upstream portion 7a is made constant over the entire length in the flow direction of the working fluid; The cross-sectional area of the outlet portion of the discharge path 7 is the same. That is, the cross-sectional area of the flow path including the discharge path 7 and the discharge port 21 is constant over the entire length in the flow direction of the working fluid. Therefore, the working fluid in the pump chamber 2 can be derived more smoothly.

Furthermore, the discharge-side upstream portion 7a constituting the upstream side of the discharge path 7 includes an inner side surface 43 that faces the discharge port 21. The inner side surface 43 is a distance between the inner side surface 43 and the discharge port 21 ( dimensions shown in Figure 1 M) is inclined to gradually become longer enough toward the front of the rotor 3 times rotation direction. The inner surface 43 is located on the tangent line of the inner peripheral surface of the ring member 17 which passes through the rear end of the rotor 3 times rotational direction of the discharge port 21 in a plan view, smoothly continuous with the inner peripheral surface of the ring member 17 Yes. As a result, the working fluid flowing into the discharge path 7 can be led out from the pump chamber 2 more smoothly.

  The working fluid of the vane pump 1 in each of the above examples is a liquid such as water, alcohol, or antifreeze, but may be other liquids.

It is an example of an embodiment of the invention and is a horizontal sectional view of a vane pump. FIG. 2 is a side view partially cut away at A-A in FIG. 1. (A) is the partially broken perspective view of a vane pump, (b) is a side view of the vane pump partially broken like (a). It is a perspective view of the upper case and ring material of a vane pump same as the above. It is the perspective view seen from the lower side of the upper case same as the above. (A) is DD sectional drawing of FIG. 1, (b) is CC sectional drawing of FIG. 1, (c) is BB sectional drawing of FIG. (A) is FF sectional drawing of FIG. 1, (b) is EE sectional drawing of FIG. It is sectional drawing of the conventional vane pump.

DESCRIPTION OF SYMBOLS 1 Vane pump 2 Pump chamber 2a Inner peripheral surface 3 Rotor 4 Vane 5 Actuation chamber 6 Suction path 7 Discharge path 10 Casing 20 Suction port 21 Discharge port

Claims (3)

A pump chamber formed in the casing, a rotor housed in the pump chamber, a plurality of vanes provided in the circumferential direction of the rotor and having tips slidably contacting the inner peripheral surface of the pump chamber, an inner surface of the pump chamber, and an outer peripheral surface of the rotor A working chamber that is surrounded by a vane and that changes its volume by rotational driving of the rotor is provided, and is connected to an inner peripheral surface of the pump chamber to a working chamber in the volume expansion process and to a working chamber in the volume reduction process. the discharge port is formed, the inlet and discharge ports are arranged on one side shifted from each vane in the rotor scan last direction so that when viewed from the rotor radial direction do not overlap with each vane, communicating with the intake port into the casing inhaled route and to form a discharge passage which communicates with the discharge port, these intake passage and the discharge passage is formed in a position that overlaps with the pump chamber as viewed from the rotor la dialkyl direction, rotor thrust side of the suction port The dimension along the inner circumferential surface of the suction inlet of the pump chamber as well as shorter than the diameter of the inlet portion of the dimension inhalation route longer than the diameter of the inlet portion of the suction passage in the rotor scan last discharge ports The dimension in the direction is made shorter than the diameter of the outlet part of the discharge path, and the dimension in the direction along the inner peripheral surface of the pump chamber of the discharge port is made longer than the diameter of the outlet part of the discharge path. Vane pump to do. Upstream end of the discharge passage comprises an inner surface facing the discharge port, and characterized by comprising gradually lengthened enough to go the distance between the inner side and the outlet on the front side in the rotor Rotational direction the vane pump according to claim 1.   The vane pump according to claim 1 or 2, wherein a cross-sectional area of the flow path constituted by the discharge flow path and the discharge port is made constant over the entire length in the flow direction of the working fluid.

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