Plunger pump is the important device for pumping fluid.It is moved back and forth by plunger in the cylinder holes of cylinder body, is made close
The volume of envelope working volumes changes to realize suction and spray.Plunger pump has rated pressure height, compact conformation, efficiency high
The advantages of facilitating with Flow-rate adjustment, is widely used in the occasion that high pressure, big flow and flow need to adjust, such as hydraulic press,
In engineering machinery and ship.
Plunger pump includes two kinds of representative forms of axial plunger pump and radial plunger pump, and axial plunger pump is due to volume
Small the advantages of, and be used widely.
Traditional axial plunger pump includes cylinder body, reciprocating plunger and swash plate in cylinder body.One end of plunger exists
Move back and forth in cylinder body to suck or ejecting fluid, and the other end is for example resisted against on swash plate by piston shoes and as cylinder body is rotated
And slided on swash plate along the circumferencial direction of swash plate.And it is possible to realize the row of change by adjusting the angle of inclination of swash plate
The pump of amount and pressure.
This structure is effective in terms of for highly viscous fluid, still, in the fluid to be pressurizeed for for example
During the fluid of water, because the viscosity of water is low, poor lubricity etc., the greasy property between piston shoes and swash plate is poor, thus limit tiltedly
The angle of inclination of disk, and then limit the discharge capacity of pump and the raising of pressure.
In order to overcome this problem, in the Chinese invention patent CN100362232C of the applicant is transferred, it is proposed that
A kind of axial plunger pump for being applied to pumping low viscosity fluid, in this axial plunger pump, cylinder body keeps solid relative to housing
Fixed, plunger is arranged on swash plate by bulb, and swash plate is rotatably installed on the crank throw of live spindle, and thus swash plate drives post
Fill in sphere to swing, thus avoid the friction problem between swash plate and the piston shoes of plunger.But, the problem of this scheme is present exists
It is cantilever support in live spindle, causes very big unbalanced moments so that in the process of running, the swing stability of swash plate
Difference, the vibration of whole pump is big, causes the problems such as noise, friction.
In order to overcome this unbalanced moments, the Chinese utility model patent CN201739111U of the applicant is being transferred
In, above-mentioned axial plunger pump is improved, i.e. so that live spindle supports for two ends, adopted near the input of main shaft
With two groups of bearings to strengthen the support to main shaft, and the radial outside of swash plate is provided with guide runner, the guide runner exists
The guide chute formed in the appropriate section of housing coordinates, to guide the swing of swash plate.But, this scheme is still without can not be thorough
Bottom solves that plunger pump vibration is big, rotational stability is poor, noise and the problem of friction big etc., and also brings guide runner and guiding
The friction increase of chute, and then reduce the life-span of whole pump.Further, since main shaft in its input by two groups of bearings,
And in the opposite end of main shaft in addition using one group of bearings so that the problem of main shaft has Planar Mechanisms, thus, cause main shaft
In stress it is excessive, reduce main shaft and and then whole pump life-span.
Above-mentioned two patent is incorporated by reference in its entirety.
Therefore, still suffer to the further improved needs of this axial plunger pump.
The content of the invention
In order to solve the above problems, it is proposed that the present invention.It is an object of the present invention to provide a kind of axial plunger pump,
The axial plunger pump is particularly suitable for pumping low viscosity fluid, such as seawater or fresh water, and can have good equilibrium response, drop
The vibration of low pump and noise, and improve the life-span of pump.
According to an aspect of the invention, there is provided a kind of axial plunger pump, the axial plunger pump includes housing, rotatable
Ground is arranged in housing and the entering spindle including middle oblique curved segment, be installed in rotation on it is oblique in the oblique curved segment in the centre
Disk, one end by bulb hinged to the swash plate and the other end be provided with plunger multiple connecting rods and can with plunger
The cylinder body for the cylinder holes being reciprocally inserted, wherein the cylinder body is fixed relative to the housing, as the input is led
The rotation swash plate of axle does space sphere swing, and wherein described entering spindle also includes first straight line section, and described first is straight
Line segment is pivotally supported on the housing by bearing, and is additionally provided with gimbal in first straight line section, institute
Gimbal is stated for eccentric structure and is rotated together with the entering spindle.
By setting the gimbal of eccentric structure, the unbalanced moments of the swash plate can be further offset, further drop
The vibration of low whole axial plunger pump and noise.
It is advantageous that the intersection point of the axis of the oblique curved segment of axis and the centre of the first straight line section of the entering spindle,
The center of circle for the circle that the center of the sphere oscillation center of the swash plate and the bulb of the multiple connecting rod is constituted is overlapped in coincidence point
By causing above-mentioned intersection point, oscillation center and the center of circle to overlap, when can offset the swash plate and doing space sphere swing
Unbalanced moments, reduce vibration and the noise of whole axial plunger pump.
It is advantageous that also including swash plate limits change, the swash plate limit change on the one hand can by connecting shaft and the swash plate
Connect in relative rotation, and on the other hand swash plate limit change is connected by the bearing pin diametrically set with the housing
So that the swash plate limit change is swingable relative to the housing around the bearing pin.
The axis of connecting shaft and the intersection point of the axis of the bearing pin and the coincidence point weight of wherein described swash plate limit change
Overlapped by the intersection point for causing swash plate to limit change with above-mentioned coincidence point, can further offset the injustice of the swash plate
Weigh torque, further reduces vibration and the noise of whole axial plunger pump.
It is advantageous that also include flat valve, the flat valve include valve seat and suction valve core in valve seat and
Discharge valve core, the suction valve core and the discharge valve core be biased to the valve seat respectively, wherein, the valve element by
Corrosion resistant high strength light material is made, and the material is, for example, titanium alloy.
By using corrosion resistant high strength light material so that valve element can resist the corrosion of such as seawater, and can
To mitigate its weight, the movement inertia of valve element is thus reduced.
It is advantageous that being formed with ring-type between the outer surface matching surface corresponding to the valve seat of each valve element
Gap, the annular gap is for example not less than 0.5 millimeter.In addition, the valve seat forms the second gap with being engaged between element, should
Second gap is for example at 0.3 to 0.4 millimeter.
By setting above-mentioned annular gap and the second gap, impact inertia when valve element is moved back and forth can be reduced.Thus
Improve the functional reliability of flat valve, corrosion resistance, Adaptability of medium, and when reducing flat valve and axial plunger pump work
Vibration and noise.
It is described in detail with reference to the accompanying drawings according to the preferred embodiment of the present invention.It is noted that the description only goes out
It is unrestricted in the purpose of illustration, also, it will be appreciated by one of skill in the art that the present invention can be practiced in a variety of ways,
And should not be limited to preferred embodiment described here.
In the following description, it is noted that the description as described in direction, such as outside, inner side, upside or downside are references
Direction shown in accompanying drawing is made, in order to explanation and illustration, but the invention is not limited in this, but can basis
Described part or the concrete application situation of device or installation site are varied from.
Fig. 1 shows the principal section figure of axial plunger pump according to the embodiment of the present invention.As shown in figure 1, axial columns
Filling in pump (hereinafter referred to as pump) includes housing 1, and entering spindle 2 is pivotally supported on the housing 1 by bearing 31 and 32.Tool
Say, as shown in Figures 2 and 3, entering spindle 2 includes first straight line section 21, middle tiltedly curved segment 22 and second straight line section 23 body, the
One straightway 21 and second straight line section are 23 in alignment, and middle tiltedly curved segment 22 is provided integrally at first straight line section 21 and the
Between two straightways 23.As shown in figure 3, the middle tiltedly axis of curved segment 22 and the axis of the first and second straightways 21 and 22 are into 15
To 40 degree of angle, the angle can change according to the expectation flow and pressure of pump.
The first straight line section 21 of entering spindle 2 is supported on housing 1 by bearing 31, for example, be supported on the end cap of housing 1
On 11, the bearing 31 is, for example, ball bearing.But the invention is not limited in this, it would however also be possible to employ other kinds of bearing.Together
When, the second straight line section 23 of entering spindle 2 is also supported on housing 1 by another bearing 32 (being also, for example, ball bearing).
Middle tiltedly curved segment 22 can for example include two different diameter parts, and swash plate 5 for example passes through two different sizes
Taper roll bearing 33 is rotatably installed in middle tiltedly curved segment 22.
As shown in Figure 5 and Figure 6, in the first straight line section 21 of the entering spindle 2, such as, by key 24, it is provided with flat
Weigh ring 25 so that entering spindle 2 and gimbal 25 can rotate jointly.Gimbal 25 includes axial component 251 and radial component
252, the axial component 251 is enclosed in the first straight line of entering spindle 2 section 21, and the inner ring of clutch shaft bearing 3 can be enclosed on this
On the excircle of axial component 251.The radial component 252 of gimbal 25 is eccentrical shape, with the rotary course of entering spindle 2
In, offset the oblique curved segment 22 in centre in entering spindle 2 and imbalance that the swash plate that is installed in middle tiltedly curved segment 22 is brought.
The swash plate 5 of axial plunger pump is described referring to Fig. 2 and Fig. 3.As described above, swash plate 5 passes through two circular cones
Roller bearing 33 is supported in the oblique curved segment 22 in the centre of entering spindle 2 so that swash plate 5 is tilted relative to the axis of entering spindle 2
The angle of 15 to 40 degree.Swash plate 5 includes swash plate body 51 and swash plate gland 52, and swash plate body 51 and swash plate gland 52 for example pass through
Mode connects for screw is to together.Swash plate body 51 and swash plate gland 52 are equally spaced formed with multiple cavitys in a circumferential direction respectively,
So that when swash plate body 51 and swash plate gland 52 are assemblied together, corresponding cavity pieces together bulb chamber, the bulb of connecting rod
71 are contained in each bulb chamber.
For each bulb chamber, as shown in Fig. 2 for example, it is recessed cavity to form cavity in swash plate body 51,
And the cavity formed in swash plate gland 52 is Through-cavity, the Through-cavity is formed with enlarging on one end towards cylinder body
512.The recessed cavity pieces together bulb chamber with Through-cavity.In addition, distinguishing liner in above-mentioned recessed cavity and Through-cavity
Have such as the cushion block 513 and 523 being made as copper, the cushion block 513 and 523 coordinates, and forms the bulb 71 of tight enclosure connecting rod
Spherical hollow space, with bulb 71 formation ball pivot coordinate, with allow bulb 71 inside make spherical rotary motion.
Coordinated by setting single cushion block in bulb intracavitary with the formation ball pivot of bulb 71, with bulb 71 directly and swash plate
Material formation ball pivot, which coordinates, to be compared, and can reduce the friction of bulb 71, and can be with readily replaceable, reduction when cushion block is worn
In addition, in order to balance the unbalanced moments of swash plate 5 in the course of the work, swash plate is provided with the outer circumferential side of swash plate 5
Change 8 is limited, on the one hand swash plate limit change 8 is for example connected by connecting shaft 81 with swash plate 5 so that swash plate limits change 8 and swash plate 5
It can be relatively rotated around the axis of connecting shaft 81, on the other hand, as shown in figure 3, swash plate limit change 8 passes through two relative pins
The housing 1 of axle 82 and plunger pump is rotatably connected.Bearing pin 82 substantially differs 90 degree in a circumferential direction with connecting shaft 81.The swash plate
The concrete structure of change 8 is limited described in Chinese utility model patent CN201739163U, the patent is therefore overall by quoting
It is hereby incorporated by.
In addition, in order to further eliminate swash plate 5 in rotation process caused by unbalanced moments, entering spindle 2, swash plate 5,
Swash plate limit change 8 be further constructed so that entering spindle 2 through first straight line section 21 and second straight line section 23 axis with
Intersection point, the swash plate of the middle tiltedly axis of curved segment 22 make the center of sphere swing, the circle that the center of each plunger ball 71 is constituted
The center of circle, the bearing pin 82 of swash plate limit change 8 and swash plate limit the joining coincidence for the connecting shaft 81 that change is connected with swash plate on one point,
Identified and referred to as coincidence point with A in figure, hereinafter referred to as four hearts are overlapped.
With continued reference to Fig. 1, multiple connecting rods 7 are included according to the axial plunger pump of the present invention, one end of each connecting rod 7 passes through ball
First 71 engage with the ball pivot of swash plate 5, and its other end is connected with plunger 4.In corresponding cylinder holes in the plunger 4 insertion cylinder body 10
101, with the drive of connecting rod 7 in cylinder holes 101 it is reciprocating.Cylinder body 10 is fixed relative to housing.
Reference picture 4, is additionally provided with flat valve 9 in housing 1, and the flat valve 9 optionally will open into the cylinder holes 101 of cylinder body
Valve plate passage be connected with the suction passage and passing away of plunger pump.The flat valve includes valve seat 91, suction valve core
92nd, inhalation valve spring 93, discharge valve core 94, discharge valve spring 95.Inhalation valve spring 93 is biased in valve by valve core 92 is sucked
On seat 91, with the suction passage 96 of canned pump, discharge valve spring 95 is biased in valve core 94 is discharged on valve seat 91 with canned pump
Passing away 97.
Above-mentioned suction valve core and discharge valve core can use corrosion resistant high strength light material, such as titanium alloy system
Into to mitigate its weight, thus reducing the movement inertia of valve element.
As shown in figure 4, suction valve core 92 and discharge valve core 94 are respectively installed to cause outer peripheral face and the matching of valve element
The annular slot G1 between the inner peripheral surface of part is closed for example not less than 0.5 millimeter so that reduce valve element rubbing in quick motion
Wipe resistance.In addition, being sealed between valve seat 91 and housing by sealing ring.After flat valve is assembled in housing, valve seat and phase
Clearance G 2 is formed between co-operating member, the element that is engaged can include housing or valve pocket.The clearance G 2 for example 0.3 to
Between 0.4 millimeter, for reducing impact inertia when valve element is moved back and forth, and then noise is reduced.
The working method of the axial plunger pump according to the present invention is briefly described below.
When according to axial plunger pump work of the invention, power source, such as motor (not shown) is activated so as to axle
Input and rotate to plunger pump.
Under the drive of motor, the entering spindle 2 of axial plunger pump is rotated relative to housing 1, in entering spindle and branch
Support under bearing, swash plate and swash plate spring bearing, the collective effect of swash plate limit change, the swash plate 5 in middle tiltedly curved segment 22
Do not rotate, but space sphere swing is done around coincidence point A.And due in the first straight line of entering spindle 2 section 21
Gimbal and swash plate limit the effect of change and because four heart described above is overlapped, and the swing imbalance of swash plate is effectively supported
The sphere of swash plate 5 swings drivening rod and plunger 4 and moved back and forth in the cylinder holes 101 of cylinder body 10, to be pointed out
It is that, due to the presence of enlarging 512, the bulb chamber and bulb and connecting rod of the swash plate during the sphere of swash plate 5 is swung can be avoided
Further as shown in figure 4, when plunger is motionless, due to inhalation valve spring and the bias effect of discharge valve spring,
Sealing space is formed between cylinder holes and plunger front end and inlet valve.When plunger is moved upwards, form true in the sealing space
Sky, when the pressure differential for sucking the both sides of valve core 92 is more than the biasing force of inhalation valve spring 93, suction valve core 92 is overcome suction
The power for entering valve spring 93 moves right, thus, opens suction passage, sucks working media, such as water.When plunger is moved downward
When, the pressure increase in sealing space so that suction valve core 92 is quickly closed, and now, the pressure of the increase overcomes discharge
The biasing force of valve spring 94 and will discharge valve core 93 open, thus by cylinder holes medium discharge.And so on so that axially
Plunger pump sucks medium and discharged after the medium is pressurizeed.
In the present invention, by setting gimbal in the first straight line of entering spindle section, and by by structures such as swash plates
Part is configured to the coincidence of four hearts, can offset the unbalanced moments in swash plate motion process so that according to the axial columns of the present invention
Plug pump more smoothly works, reduces work noise and reduces the abrasion of equipment.And thereby eliminate in the prior art defeated
Enter the need for two groups of bearings are set in the first straight line section of main shaft, the problem of overcoming the Planar Mechanisms of entering spindle.
In the present invention, by causing valve seat and pump housing retention gap, impact inertia when valve element is moved back and forth is reduced,
So that flat valve reliable operation, Adaptability of medium are strong, work when noise and vibrate small.
Although the detailed description carried out above to the preferred embodiment of the present invention, in view of above description, ability
Field technique personnel are contemplated that various modifications and variations.Therefore, the present invention should not be limited to above-mentioned specific embodiment, this
The protection domain of invention is only limited by appended appended claims and their equivalents.