CN206409383U - A kind of vavuum pump - Google Patents

Abstract

The utility model discloses a kind of vavuum pump, it includes：Electric machine casing, pump seat, end cap, electric machine assembly and pump group part, wherein, the electric machine assembly is fixed to the pump seat by the electric machine casing, the pump seat limits pump accommodating chamber, the pump group part is arranged in the pump accommodating chamber, the motor shaft of the electric machine assembly is stretched into the pump accommodating chamber, and to engage the pump group part, the end cap closes the pump accommodating chamber.Vavuum pump of the present utility model can simplify the assembling process of vavuum pump, while improving the outward appearance globality of vavuum pump, and be also particularly conducive to eliminate noise and reduce the volume of vavuum pump.

Description

A kind of vavuum pump

Technical field

The utility model is related to fluid machinery technical field, and in particular to a kind of vavuum pump.

Background technology

Vavuum pump of the prior art, such as vane-type vacuum pump, generally include three parts from profile, i.e. motor Housing, pump case and installing plate, wherein, electric machine assembly and pump group part are fixedly installed to installation in the both sides of installing plate respectively Plate, electric machine casing and pump case are covered on outside electric machine assembly and outside pump group part respectively, and are equally fixed to installing plate, example Such as, the vavuum pump disclosed in patent document CN104131979A.The vavuum pump of this structure type, exist assembling process trouble, The shortcomings of outward appearance globality poor and larger noise.

In addition, for vane-type vacuum pump, the junction of electric machine assembly and pump group part, i.e. in motor shaft and pump The driving member of moment of torsion is transmitted between rotor, is typically that driving member turns with pump using the face of cylinder or elliptic cylinder as moment of torsion transfer surface Contact surface between son is smaller, and contact stress is larger, is easily caused the damage of driving member and/or pump rotor, thus influences vacuum The life-span of pump.

Utility model content

Main purpose of the present utility model is to provide a kind of vavuum pump, and it can solve the problem that at least one in drawbacks described above Kind.

To reach above-mentioned purpose, the utility model takes following technical scheme：

A kind of vavuum pump, it includes：Electric machine casing, pump seat, end cap, electric machine assembly and pump group part, wherein, the motor casing The electric machine assembly is fixed to the pump seat by body, and the pump seat limits pump accommodating chamber, and the pump group part is arranged on the pump In accommodating chamber, the motor shaft of the electric machine assembly is stretched into the pump accommodating chamber, to engage the pump group part, the end cap closing The pump accommodating chamber.

Preferably, the end cap is plate-like members.

Preferably, the pump seat includes limiting the pump receiving on the inside of integrally formed cylindrical portion, the cylindrical portion Chamber.

Preferably, the madial wall of the cylindrical portion is provided with the multiple convex tendons protruded radially inward, and at least one pair of is adjacent The distance between convex tendon is less than the radial projection size of the convex tendon.

Preferably, the madial wall of the cylindrical portion is provided with lug, and the lug is provided with screwed hole, the end cap and set Have a connecting hole, threaded fastener pass through after the connecting hole with the engagement threaded, the end cap is fixed to the pump seat；

Or, madial wall or lateral wall at the opening of the cylindrical portion are provided with the first screw thread, and the end cap is provided with Second screw thread, the end cap is fixed to the pump seat by means of the cooperation of first screw thread and second screw thread.

Preferably, the pump group part includes pump rotor, and the motor shaft engages the pump rotor, the biography by driving member Moving part has moment of torsion transfer surface, and at least a portion of the moment of torsion transfer surface is plane.

Preferably, the moment of torsion transfer surface also includes curved surface, is seamlessly transitted between the curved surface and the plane.

Preferably, the driving member includes cylindrical-shaped main body and the torque transfer part extended from the cylindrical-shaped main body, The moment of torsion transfer surface is located in the torque transfer part.

Preferably, the torque transfer part is the first projection axially extended from the end face of the cylindrical-shaped main body, or Person, is the second projection radially extended from the lateral surface of the cylindrical-shaped main body.

Preferably, described first it is raised include medial surface, lateral surface and peripheral side, the described first raised medial surface and Lateral surface is the medial surface of the cylindrical-shaped main body and the extension of lateral surface, and the described first raised peripheral side is connection The transition face of described first raised medial surface and lateral surface, the peripheral side constitutes and states moment of torsion transfer surface.

Preferably, described second is raised including first side, second side and free end side, the first side and institute The footpath for stating second side is proximally all connected with the lateral surface of the cylindrical-shaped main body, the free end side in smoothing junction described the The radially distant end of one side, second side, a part or second side of the first side with the free end side The part in face and the free end side constitutes the moment of torsion transfer surface.

Vavuum pump of the present utility model can simplify the assembling process of vavuum pump, while the outward appearance for improving vavuum pump is overall Property, and be also particularly conducive to eliminate noise and reduce the volume of vavuum pump.

The preferred structure of vavuum pump of the present utility model is by the way that at least a portion of the moment of torsion transfer surface of driving member is set For plane, the contact surface between driving member and pump rotor can be significantly increased, reduces contact stress, extends the use longevity of vavuum pump Life.

Brief description of the drawings

Fig. 1 is the contour structures schematic diagram of the vavuum pump according to preferred embodiment of the present utility model；

Fig. 2 is the decomposing schematic representation of the vavuum pump according to preferred embodiment of the present utility model；

Fig. 3 is the schematic cross-sectional view of the vavuum pump according to preferred embodiment of the present utility model；

Fig. 4 be the utility model in pump seat contour structures schematic diagram；

Fig. 5 is the contour structures schematic diagram of another angle of Fig. 4 pump seat；

Fig. 6 be the utility model in pump group part structural representation；

Fig. 7 is the driving member and a kind of schematic diagram of embodiment of the fit structure of pump rotor in the utility model；

Fig. 8 be Fig. 7 in driving member contour structures schematic diagram；

Fig. 9 is the driving member and the schematic diagram of the another embodiment of the fit structure of pump rotor in the utility model；

Figure 10 be Fig. 9 in driving member schematic top plan view.

Embodiment

Hereinafter with reference to accompanying drawing to being described according to the preferred embodiment of vavuum pump of the present utility model.

Referring first to Fig. 1-3, the structure of the vavuum pump of preferred embodiment of the present utility model is that schematically illustrated. As seen from the figure, vavuum pump of the present utility model is generally comprised：Electric machine casing 12, pump seat 8, end cap 1, electric machine assembly 11 and pump group Part, wherein, the electric machine assembly 11 is fixed to the pump seat 8 by the electric machine casing 12, and the pump seat 8 limits pump receiving Chamber, the pump group part is arranged in the pump accommodating chamber, and the motor shaft of the electric machine assembly 11 is stretched into the pump accommodating chamber, with The pump group part is engaged, the end cap 1 closes the pump accommodating chamber.

The contour structures of vavuum pump of the present utility model only include two large divisions on the whole, i.e. electric machine casing and pump seat, On the one hand the assembling process of vavuum pump can be simplified, on the other hand also improves the outward appearance globality of vavuum pump, and it is also special Be conducive to reducing the volume of vavuum pump.

Especially, by selecting the suitable shape or thickness of end cap 1, it is easy to change the volume and intrinsic frequency of pump accommodating chamber Rate, so as to advantageously reduce vibration and noise.By contrast, pump is collectively forming using installing plate and pump case in the prior art The scheme of accommodating chamber, then be difficult the volume for changing pump accommodating chamber, and its intrinsic frequency is also difficult to change, thus must use specially Sound-silencing measures, for example, muffler is set in pump case, this increases not only cost, while causing the volume of vavuum pump to increase again Greatly.

Preferably, as depicted in figs. 1 and 2, the end cap 1 can be plate-like members.This causes the manufacture of end cap 1 very Simply, install and be also relatively easy to.It should be noted that the plate-like members described in the utility model, refer to end cap in entirety On be rendered as tabular, and its flat board for being necessary for both sides perfect parallelism is not meant that, although it can be both sides perfect parallelism Flat board.For example, end cap 1 can be locally thinning or thickening in adjacent edges, e.g., the knot such as inner convex platform or outward flange can be included Structure, in order to which installation is fixed, and is easy to change the volume of pump accommodating chamber.

Preferably, as shown in Fig. 2, Fig. 3 and Fig. 6, the pump group part includes the first cover plate 2, the pump housing 5, the second cover plate 6, pump Rotor 3 and blade 4, first cover plate 2 and second cover plate 6 are located at the both sides of the pump housing 5 respectively, to limit jointly Pump chamber, the pump rotor 3 is located in the pump chamber, and the blade 4 is slidably placed in the blade groove 301 of the pump rotor 3.

For example, the shape of cross section of pump rotor 3 is preferably circular, the shape of cross section of the madial wall of the pump housing 5 is preferably also Circle, pump rotor 3 is prejudicially arranged with the pump housing 5.For example provided with 5 (can also be any other suitable number in pump rotor 3 Mesh) blade groove 301, these radial directions of blade groove 301 at the same angle relative to pump rotor 3 are obliquely installed, and It is evenly arranged in the range of 360 degree.5 blades 4 are placed in blade groove 301 correspondingly.When pump rotor 3 rotates, each leaf Piece 4 is close to the madial wall of the pump housing 5 under the influence of centrifugal force, so that pump chamber to be divided into the suction and discharge list of multiple volume changes Member.

Second cover plate 6 is provided with air inlet duct 601, such as the circular arc elongated slot shown in Fig. 6.First cover plate 2 is provided with out Air drain 201, such as the circular arc elongated slot shown in Fig. 6.When at corresponding suction and discharge unit rotational to air inlet duct 601, it enters One step, which is rotated, causes the volume of the suction and discharge unit to become big, so that gas is sucked in the suction and discharge unit；When the suction and discharge list Member is fully disconnected with air inlet duct 601 when connecting, and the volume of the suction and discharge unit reaches maximum；Hereafter, in the further of pump rotor 3 In rotary course, the volume of the suction and discharge unit starts to diminish, and gas therein is compressed, until the suction and discharge unit When being connected with outgassing groove 201, gas is expelled in pump accommodating chamber through outgassing groove 201, for example, being expelled to the first cover plate 2 in Fig. 3 In the space of top, then discharge outside vavuum pump.

Preferably, as shown in figure 4, the pump seat 8 includes integrally formed cylindrical portion 801, the inner side of the cylindrical portion 801 Limit the pump accommodating chamber.The free end of cylindrical portion 801 is the opening of pump accommodating chamber, and the opening is closed by end cap 1.

As shown in figure 4, the inner side of cylindrical portion 801 forms pump accommodating chamber, the bottom of pump accommodating chamber is provided with air inlet 802, pump After component is arranged in pump accommodating chamber, air inlet duct 601 is aligned with the air inlet 802.On the other hand, the air inlet 802 The other end is communicated with air inlet pipe 9 (being shown in Fig. 1, Fig. 2 and Fig. 5), so as to which ambient atmos are sucked in pump group part.Air inlet pipe 9 It is preferred that being arranged in the way of interference fit or Screw assembly on pump seat 8.

The bottom (such as close to edge) of pump accommodating chamber is additionally provided with gas outlet (not shown), when pump group part is held installed in pump When receiving in chamber, pump group part does not block the gas outlet, so that, the space of the top of the first cover plate 2 is through pump group part edge and cylindrical portion Gap between 801 madial walls is connected with the gas outlet.On the other hand, the other end of the gas outlet (shows with escape pipe 10 In Fig. 1 and Fig. 5) communicate, so as to which the gas in pump group part is discharged outside vavuum pump.Escape pipe 10 preferably be interference fitted or The mode of Screw assembly is arranged on pump seat 8.

Preferably, as shown in figure 4, the madial wall of the cylindrical portion 801 is provided with the multiple convex tendons protruded radially inward 803, the distance between at least one pair of adjacent convex tendon 803 is less than the radial projection size of the convex tendon 803.Due to adjacent convex Narrow slot is formed between muscle 803, on the one hand, when sound wave passes through these narrow slots, easily occur reflection and interfere, reduce acoustic energy, So as to form resistant noise-reducing device, meanwhile, it can also reduce the flow velocity and pressure of air-flow, realize preferable sound-deadening and noise-reducing effect；Separately On the one hand, sound-absorbing porous material can also be set in these narrow slots, so that resistive silencing means is constituted, to reduce making an uproar for vavuum pump Sound.

Preferably, 3 convex tendon groups for example can be set on the madial wall of cylindrical portion 801, each convex tendon group includes multiple convex Muscle 803.Obviously, convex tendon more than 803, the bigger area of easier covering, so that sound wave occurs reflection and the probability of interference is bigger, Or more sound-absorbing porous materials can be accommodated, thus erasure effect is also better.However, the setting of convex tendon 803 also needs to examine The installation of pump group part is considered, not interfere the installation of pump group part to be defined.

Preferably, adjacent convex tendon 803 has different radial projection sizes, such as the radial projection size of each convex tendon can Alternately to change, e.g., change according to high and low, high and low rule, so as to strengthen the effect of sound wave reflection and interference, further Reduce the noise of vavuum pump.

Preferably, as shown in figure 4, on the axial direction of vavuum pump, one end of the convex tendon 803 abuts the pump and accommodated The bottom surface of chamber, the other end abuts the end cap 1.That is, the axial dimension of each convex tendon 803 reaches maximum, so as to accommodate more Many sound-absorbing porous materials, further ensure erasure effect.

Preferably, still as shown in figure 4, the madial wall of the cylindrical portion 801 is provided with lug 804, set on the lug 804 Have a screwed hole, the end cap 1 is provided with connecting hole, threaded fastener (screw etc.) pass through after the connecting hole with the spiral shell Pit is engaged, and just the end cap 1 can be fixed into the pump seat 8.

Alternatively, threaded fastener can also be not provided between end cap 1 and pump seat 8, but is completed by the screw thread of itself Fastening.For example, the first screw thread can be provided with the madial wall at the opening of the cylindrical portion 801 or lateral wall, at the end The second screw thread is accordingly provided with lid 1, the end cap 1 is so as to by means of the cooperation of first screw thread and second screw thread It is fixed to the pump seat 8.

When vavuum pump uses pump seat provided by the utility model, the assembling process of vavuum pump can be simplified, carried simultaneously The outward appearance globality of high-vacuum pump, and be also particularly conducive to eliminate noise and reduce the volume of vavuum pump.

In addition, as background section is previously mentioned, in the prior art, moment of torsion is transmitted between motor shaft and pump rotor Driving member, is typically that this structure causes between driving member and pump rotor using the face of cylinder or elliptic cylinder as moment of torsion transfer surface Contact surface it is smaller, contact stress is larger, is easily caused the damage (damaging by pressure for such as contact surface) of driving member and/or pump rotor, Thus the life-span of vavuum pump is influenceed.

Therefore, the utility model makes improvement to the structure of driving member.

As it was previously stated, in vavuum pump of the present utility model, the pump group part includes pump rotor 3, and the motor shaft is by passing Moving part 7 engages the pump rotor 3, and the driving member 7 has moment of torsion transfer surface, and at least a portion of the moment of torsion transfer surface is flat Face.It is easily understood that it is flat that the mating surface coordinated on pump rotor 3 with the moment of torsion transfer surface, which is similarly arranged at least a portion, Face.

It is plane by setting at least a portion of moment of torsion transfer surface, compared to the face of cylinder of the prior art or cylindroid Face, can significantly increase the contact surface between driving member and pump rotor, reduce contact stress, extend the service life of vavuum pump.

Preferably, the moment of torsion transfer surface also includes curved surface, is seamlessly transitted between the curved surface and the plane.Easily manage The mating surface coordinated on solution, pump rotor 3 with the moment of torsion transfer surface is similarly arranged to the curved surface peace for including seamlessly transitting Face.By the curved surface seamlessly transitted and the combination of plane, the stress concentration situation of the edge of planar section can be eliminated, so that It is further ensured that pump rotor and driving member are without damage.

Preferably, as is seen in figs 7-10, the driving member 7 includes cylindrical-shaped main body 701 and from the cylindrical-shaped main body 701 The torque transfer part 702 or 703 extended, the moment of torsion transfer surface is located in the torque transfer part 702 or 703.Accordingly, As shown in figures 7 and 9, pump rotor 3 is provided with the moment of torsion transmission recess with the form fit of torque transfer part 702 or 703, pump The mating surface coordinated on rotor 3 with the moment of torsion transfer surface is located in moment of torsion transmission recess.

When driving member 7 is fixed relative to motor shaft in the way of anti-torsion, between driving member 7 and pump rotor 3 Cooperation just can be delivered to the rotary motion of motor shaft on pump rotor 3, so as to drive pump group part operation.The phase of driving member 7 Fixed form for motor shaft is prior art, and the utility model will not be repeated here.

Because the moment of torsion transfer surface between driving member 7 and pump rotor 3 is used in above-mentioned optimal design-aside, the utility model, pump Rotor 3 can be made of graphite material, to make full use of its high temperature resistant and self-lubricating property, without worrying contact stress mistake Pump rotor is caused to fail greatly.In addition, blade 4 can also be made of graphite material, also with its lubrication and anti-wear performance, prolong The service life of long vavuum pump.

Preferably, as Figure 7-8, the torque transfer part 702 be from the end face of the cylindrical-shaped main body 701 vertically First projection 702 of extension, for example, by 120 degree of equally distributed three first projections 702.The quantity of first projection 702 also may be used To be one or other numbers.Obviously, the quantity of the first projection 702 is more, and moment of torsion transfer surface thereon is also more, moment of torsion transmission The gross area in face is also bigger.However, the quantity of the first projection 702 is more, corresponding moment of torsion transmits the quantity of recess on pump rotor 3 Many, excessive moment of torsion transmission recess will weaken the intensity of pump rotor 3, thus can influence the use longevity of vavuum pump on the other hand again Life.

Preferably, as shown in figure 8, first projection 702 includes medial surface 7021, lateral surface 7022 and peripheral side 7023, the medial surface 7021 and lateral surface 7022 of first projection 702 are medial surface and the outside of the cylindrical-shaped main body 701 The extension in face, that is, the two is respectively a part for concentric circles cylinder, the peripheral side 7023 of first projection 702 To connect the medial surface 7021 of first projection 702 and the transition face of lateral surface 7022, the peripheral side 7023 is constituted and stated Moment of torsion transfer surface.Obviously, the first projection 702 has two peripheral sides 7023, and the two peripheral sides 7023 are being rotated forward respectively Moment of torsion is transmitted during with reversion.

That is, each first projection 702 has symmetrical structure, its cross section is a part for anchor ring.Easily It is contemplated that the moment of torsion transmission recess in pump rotor 3 is the shape of deep-slotted chip breaker, its cross section and the shape phase of the first projection 702 Matching, to accommodate the first projection 702.

Preferably, the center section of the peripheral side 7023 is plane, close to the medial surface of first projection 702 7021 and lateral surface 7022 part be arc surface, seamlessly transitted between plane and arc surface.

Alternatively, as shown in figs. 9-10, the torque transfer part 703 is from the lateral surface edge of the cylindrical-shaped main body 701 The second projection 703 radially extended, for example, along symmetrically arranged two the second projections 703 of 180 degree.The quantity of second projection 703 Can also be one or other numbers.Obviously, the quantity of the second projection 703 is more, and moment of torsion transfer surface thereon is also more, moment of torsion The gross area of transfer surface is also bigger.However, the quantity of the second projection 703 is more, corresponding moment of torsion transmits the number of recess on pump rotor 3 Amount is also more, and excessive moment of torsion transmission recess will weaken the intensity of pump rotor 3, thus can influence making for vavuum pump on the other hand again Use the life-span.

Preferably, as shown in Figure 10, second projection 703 includes first side 7031, second side 7032 and freedom End side surface 7033, the footpath of the first side 7031 and the second side 7032 is proximally all connected with the cylindrical-shaped main body 701 lateral surface, 7033 first sides 7031 in smoothing junction of the free end side, the radial direction of second side 7032 are remote End, the part or the second side 7032 of the first side 7031 and the free end side 7033 with it is described from The moment of torsion transfer surface is constituted by a part for end side surface 7033, they transmit moment of torsion when rotating and reverse respectively.

Preferably, as shown in Figure 10, the first side 7031 and the second side 7032 be parallel plane, it is described from It is arc surface (being preferably the face of cylinder) by end side surface 7033, is seamlessly transitted between plane and arc surface.

When using driving member provided by the utility model in vavuum pump, even if pump rotor is using soft materials such as graphite Be made, in vavuum pump after prolonged operating, driving member be also not easy the corresponding contact face pressure of pump rotor is bad, so as to Ensure the service life of pump rotor.Equally, if driving member is made of soft material, the moment of torsion transfer surface of driving member is not allowed yet Easily it is subject to crushing, so as to ensure the service life of driving member.

Vavuum pump of the present utility model is especially suitable for use as automobile brake power-assisted electric vacuum pump.

Those skilled in the art is it is easily understood that on the premise of not conflicting, above-mentioned each preferred scheme can be free Ground combination, superposition.

It should be appreciated that above-mentioned embodiment is only illustrative, and not restrictive, without departing from of the present utility model In the case of general principle, the various obvious or equivalent modification that those skilled in the art can make for above-mentioned details Or replace, all it is included in right of the present utility model.

Claims (10)

1. a kind of vavuum pump, it is characterised in that including：Electric machine casing, pump seat, end cap, electric machine assembly and pump group part, wherein, institute State electric machine casing and the electric machine assembly is fixed to the pump seat, the pump seat limits pump accommodating chamber, and the pump group part is set In the pump accommodating chamber, the motor shaft of the electric machine assembly is stretched into the pump accommodating chamber, described to engage the pump group part End cap closes the pump accommodating chamber.

2. vavuum pump according to claim 1, it is characterised in that the end cap is plate-like members.

3. vavuum pump according to claim 1, it is characterised in that the pump seat includes integrally formed cylindrical portion, described The pump accommodating chamber is limited on the inside of cylindrical portion.

4. vavuum pump according to claim 3, it is characterised in that the madial wall of the cylindrical portion is provided with radially-inwardly convex The multiple convex tendons stretched, the distance between at least one pair of adjacent convex tendon is less than the radial projection size of the convex tendon.

5. vavuum pump according to claim 3, it is characterised in that the madial wall of the cylindrical portion is provided with lug, described Lug be provided with screwed hole, the end cap be provided with connecting hole, threaded fastener pass through the connecting hole after with the screwed hole Engagement, the pump seat is fixed to by the end cap；

Or, madial wall or lateral wall at the opening of the cylindrical portion are provided with the first screw thread, and the end cap is provided with second Screw thread, the end cap is fixed to the pump seat by means of the cooperation of first screw thread and second screw thread.

6. the vavuum pump according to one of claim 1-5, it is characterised in that the pump group part includes pump rotor, the electricity Arbor engages the pump rotor by driving member, and the driving member has moment of torsion transfer surface, at least the one of the moment of torsion transfer surface Part is plane.

7. vavuum pump according to claim 6, it is characterised in that the moment of torsion transfer surface also includes curved surface, the curved surface Seamlessly transitted between the plane.

8. vavuum pump according to claim 6, it is characterised in that the driving member includes cylindrical-shaped main body and from the circle The torque transfer part that tubular body is extended, the moment of torsion transfer surface is located in the torque transfer part.

9. vavuum pump according to claim 8, it is characterised in that the torque transfer part is from the cylindrical-shaped main body The first projection that end face is axially extended, or, it is the second projection radially extended from the lateral surface of the cylindrical-shaped main body.

10. vavuum pump according to claim 9, it is characterised in that

Described first is raised including medial surface, lateral surface and peripheral side, and the described first raised medial surface and lateral surface is institute The medial surface of cylindrical-shaped main body and the extension of lateral surface are stated, the described first raised peripheral side is convex to connect described first The medial surface and the transition face of lateral surface risen, the peripheral side constitutes and states moment of torsion transfer surface；

Or, described second is raised including first side, second side and free end side, the first side and described second The footpath of side is proximally all connected with the lateral surface of the cylindrical-shaped main body, free end side first side in smoothing junction Face, the radially distant end of second side, the part or the second side of the first side and the free end side with A part for the free end side constitutes the moment of torsion transfer surface.