CN113790137A

CN113790137A - Reciprocating piston and pump

Info

Publication number: CN113790137A
Application number: CN202111095345.6A
Authority: CN
Inventors: 苑亚忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2021-12-14
Anticipated expiration: 2041-09-17
Also published as: CN113790137B

Abstract

A reciprocating piston and a pump relate to the field of piston pumps. A deflection power source is arranged and used for outputting and connecting the swash plate; the piston is provided with a connecting rod, one end of the connecting rod is directly and fixedly connected with the swash plate, and the other end of the connecting rod is fixedly connected with the piston; the piston cavity is adaptive to the piston; the swash plate is driven by a deflection power source to deflect, the connecting rod reciprocates in a swinging mode along with the swash plate, and the connecting rod drives the pistons to slide in the piston cavities in a reciprocating mode; the swash plate is provided with at least one piston, and each piston is correspondingly provided with a piston cavity. Compared with the traditional high-pressure piston diaphragm pump structure, the invention reduces the spring reset structure, realizes the automatic inlet and outlet of the piston in the piston cavity through the deflection reciprocating motion of the swash plate, and avoids the defect of heat loss caused by the centrifugal force generated by the rotation of the plunger of the traditional swash plate multi-plunger high-pressure pump and the friction of the plunger hole because the piston is rigidly connected with the swash plate. The invention also includes a pump.

Description

Reciprocating piston and pump

Technical Field

The invention relates to the field of liquid pumps, in particular to a reciprocating piston and a pump.

Background

The pump can be divided into mechanical diaphragm pump, hydraulic diaphragm pump and plunger pump according to the volume cycle change of the working chamber. The mechanical diaphragm pump (the diaphragm is made of metal or nonmetal materials) is pushed and pulled mechanically, the working pressure in the ideal service life is normal pressure or below 0.2MPa, and the fatigue aging of the diaphragm can be accelerated along with the increase of the outlet pressure. The hydraulic diaphragm pump can not be found at the first time due to the damage and leakage of the diaphragm made of a single material, and even if the hydraulic diaphragm pump is found, the cross contamination of hydraulic oil and conveyed materials can not be avoided. Although the multilayer diaphragm can be found to break at first time, the pressure cannot be too high due to the structural problem of the diaphragm, and in addition, the cost is high. For a plunger pump, a plunger is sealed by a filler or a sealing ring, the gap is small, the friction resistance is large, the structural precision is high, the maintenance is difficult, and the plunger pump is limited in high anti-pollution requirement fluid metering application due to the structural defect that the metered medium and a lubricant in the pump cannot be completely isolated.

The piston pump reciprocates by the piston, so that the working volume of the pump cavity is periodically changed, and liquid is sucked and discharged. A classic piston pump is: it is composed of pump cylinder, piston, inlet and outlet check valve, inlet and outlet pipe, connecting rod and driving device. The piston is driven by power to reciprocate in the pump cylinder. In the existing high-pressure plunger diaphragm pump, a transmission device is a linkage structure of the transmission device and a piston provided with a return spring, which is designed on a deflection swash plate and used for realizing the change of the working volume of a diaphragm pump cavity, and a spring device is usually aged and lost in long-term use, so that the service life and the cost of a pump body are influenced; the other multi-plunger swash plate pump for the hydraulic system works under the condition of high-speed rotation, and the centrifugal force generated by the rotation of the plunger cavity can aggravate the friction between the plunger and the outer side of the plunger hole wall, which is also the reason why the pump is mainly used for conveying liquid materials with lubricating property. The structure of the invention can completely avoid eccentric wear caused by centrifugal force and is more compatible with material conveying without lubricity.

Disclosure of Invention

The present invention is directed to overcoming at least one of the deficiencies of the prior art, and providing a reciprocating piston and pump that overcomes the losses and costs associated with springs; and secondly, the centrifugal friction between the plunger and the plunger hole of the rotary round multi-plunger assembly is completely avoided.

The technical scheme adopted by the invention is as follows: a reciprocating piston provided with:

the deflection power source is used for outputting and connecting the swash plate so as to deflect the swash plate around a central point;

the piston is provided with a connecting rod, one end of the connecting rod is directly and fixedly connected with the swash plate, and the other end of the connecting rod is fixedly connected with the piston;

the piston cavity is adaptive to the piston;

the swash plate is driven by a deflection power source to deflect, the connecting rod reciprocates in a swinging mode along with the swash plate, and the connecting rod drives the pistons to slide in the piston cavities in a reciprocating mode;

the swash plate is provided with at least one piston, and each piston is correspondingly provided with a piston cavity. In order to overcome the problem of loss of the spring device, the invention does not directly consider improvement from the loss caused by reducing the spring reset, but designs the spring device in the aspect of further considering the replaceability; from the viewpoint that the movement of the swash plate has a reciprocating deflection property, the movement of the swash plate is further considered to be linked to the piston structure; wherein, seen from the fixed connection at one end of the connecting rod, the reciprocating deflection of the swash plate is directly transmitted to the connecting rod, seen from the fixed connection designed at the other end of the connecting rod, on one hand, the back-and-forth motion mode of the swash plate in the main direction is transmitted to the piston to drive the piston to move back and forth in the same direction, can be understood as the revolution of the piston, on the other hand, the piston can also deflect at the fixed connection part to realize the conversion of the deflection of the swash plate in other directions into the rotation at the spherical piston, the unique mode of combining revolution and rotation enables the linkage of the swash plate to be converted into front and back transmission in the main direction, and at the moment, the designer only needs to design a piston cavity structure at the later stage to adapt to the deflection, the automatic reset of the piston is realized, compared with the traditional pump body piston structure, the pump cavity can be periodically changed without designing a spring or other reset structures; it should be additionally noted that, in this design concept, the revolution of the pistons is determined by the motion mode of the driven swash plate, if the swash plate only moves linearly in the main direction, the piston cavity is adapted to be a linear cavity, and if the swash plate moves in an arc shape, the piston cavity is adapted to be an adapted arc structure; it should be emphasized that the main direction involved in the present invention may be the final output direction of the power source according to the actual application situation of the designer, or may be one or more of the splitting directions in the output direction.

Preferably, the swash plate is a disc, and all pistons are distributed on the same diameter of the swash plate.

Preferably, the number of the pistons on the swash plate is one or two, wherein the two pistons are distributed on the same diameter line of the swash plate. In order to realize the pumping power of the liquid with higher power, the number of the pistons of the scheme can be further set to be two, and at most, only two pistons on the same diameter are provided, and due to the deflection characteristic of the swash plate driving the pistons, if a plurality of pistons which are not arranged on the same diameter are present, the deflection of the two pistons which are not arranged on the same diameter has an interlocking effect, so that the situation that the pistons extrude the piston cavities is caused, and the operation cannot be carried out.

Furthermore, the distance between the two pistons and the circle center of the swash plate is equal.

Preferably, the piston slides back and forth in the piston cavity, and the piston deflects laterally in the piston cavity, so as to realize the periodical volume change of the piston cavity. In order to further realize the periodic variation of the volume of the piston cavity, the invention further designs a sliding mode of the piston, which comprises the forward and backward sliding and the lateral deflection of the piston cavity, wherein the forward and backward sliding refers to the forward and backward sliding in the piston cavity in the main direction and is used for realizing the reciprocating motion to open or close the piston cavity and realize the periodic variation of the volume, and simultaneously, the transmission of the swash plate in other directions is converted into the deflection of the piston in the piston cavity.

Preferably, the piston cavity is an arc cavity. On the basis of the rotary reciprocating motion of the first motion shaft vertical to the horizontal plane and the central output shaft, the piston cavity is further provided with a structural characteristic: the arc-shaped cavity is adapted to the reciprocating motion with the first rotating shaft as the center, namely, when the swash plate deflects forwards, the piston also deflects forwards.

Preferably, the arc-shaped contour of the arc-shaped cavity has a radius and a circle center, the deflection power source has a central output shaft, and the circle center is overlapped with the central output shaft. For guaranteeing that the piston can not control extrusion piston chamber relatively when sliding and make its variant, design into the centre of a circle in arc chamber and the coincidence of central output shaft, at this moment, can guarantee that piston and sloping cam plate are concentric circles or concentric movement in the transmission relation, the two angular velocity is the same, make the piston can not have preferred rolling motion on the basis of sloping cam plate transmission relation, the existence of this kind of rolling motion can make the piston can further extrude the piston chamber, make the piston chamber gradually the variant, be unfavorable for increasing the life of device.

Preferably, the swash plate is driven by the deflection power source to deflect around a deflection center, the deflection center is overlapped with the circle center, and the deflection center is overlapped with the central output shaft. On the basis of angular velocity coincidence, the device further reduces the device combination difficulty, namely the tangential velocities of the device and the swash plate are the same, at the moment, the intersection point of the circle of the arc-shaped cavity and the central output shaft needs to be arranged on the surface of the swash plate, at the moment, the front deflection and the back deflection and the left deflection of the piston cannot extrude the piston cavity, and the change of the volume in the piston cavity can be driven.

Preferably, the piston has a partially spherical configuration. In order to realize the sealing performance of the piston cavity between the pistons, on the basis that a driving connecting rod has a path of moving back and forth and deflecting left and right, the invention is further provided with a structure of the piston relative to the piston cavity, wherein the partial spherical structure is relative to the structure that the piston is contacted with the piston cavity, at the moment, in the arc-shaped piston cavity, the part, contacted with the piston, of the piston is at least provided with a spheroid surface structure, and the section spherical center angle of the spheroid surface is larger than or equal to the deflection motion angles of the left side and the right side of the connecting rod, so that the designed gap between the piston and the cavity is kept all the time when the piston moves in the piston cavity.

Preferably, the piston is of a spherical structure.

Preferably, the arc-shaped cavity is adapted to the ball body; or, the spheroid periphery is equipped with the mounting groove, corresponds the mounting groove is equipped with the collar, the arc structure of collar is outstanding the mounting groove sets up, the collar with the adaptation of arc chamber internal diameter size sets up. In order to realize the function of the piston under the spherical piston structure, on one hand, the scheme directly sets the size adaptation of the piston and the piston cavity to ensure that the piston self realizes the sealing of the piston cavity, on the other hand, in consideration of the assembly difficulty of products in actual environment, the scheme further designs the spheroidal structure into a movably-mounted mounting ring, the mounting ring is loaded at the outer side of the center of the piston, when the mounting ring is not arranged, the requirement of the invention on the adaptation of the spherical piston structure and the arc-shaped cavity is difficult to achieve on a production line, the quality requirement of operators for assembling the product is higher, the mounting ring structure is adopted, the characteristic of the mounting ring with clearance in the groove is utilized by the inner wall of the piston hole, the position of the mounting ring is determined by the plunger hole during the assembly, the assembly difficulty of the operators can be reduced, and the structure can be compatible with the position tolerance change of parts caused by thermal expansion and cold contraction and the reduction of the friction loss between asymmetric structures .

Preferably, the mounting ring and the mounting groove are in gap elastic damping fit. For further reducing foretell installation degree of difficulty, this scheme is through further setting up the gap cooperation between collar and the mounting groove, and this kind of less gap provides certain microcosmic activity space on the basis that the collar can not drop easily guaranteeing, reduces the piston and deflects the loss to collar and piston cavity wall.

Preferably, the piston is provided with a ball head surface at one side and a conical part at the other side, and the tip of the conical part is fixedly connected with the connecting rod. This scheme is the further improvement to the piston, there is the toper structure in the one end design that the piston is close to the sloping cam plate, this kind of toper structure increases the rigidity between piston and the piston rod when the piston deflects, when the piston normally works, avoid the piston contact of one side structure and piston cavity of partial deviation, and simultaneously, the relation of connection of toper structure, make the transmission of connecting rod and piston more have the flexibility, spread the transmission torque of connecting rod to the deflection of toper structure from fixed connection, also have certain help to the stability that the bulb deflected.

A pump comprising the reciprocating piston, wherein the pump comprises a pump cavity, a floating swash plate is arranged in the pump cavity, an elastic diaphragm device is connected to the periphery of the swash plate, the elastic diaphragm device comprises an extension piece and a flexible piece, and the flexible connection of the swash plate and the pump cavity is realized through the flexible extension piece and the flexible piece; one side of the elastic diaphragm device, which is close to the deflection power source, is provided with an isolating device, the elastic diaphragm device is used for separating the pump cavity into two cavities, the cavities comprise a material cavity which is far away from the deflection power source, and the isolating device is used for separating the cavity which is close to one side of the deflection power source into two different cavities, which are respectively: the engine oil cavity is used for setting the deflection power source. This scheme is in reciprocating piston structure on, further increased with the elastic diaphragm device of piston center coplanar installation for keep apart the material chamber of sloping cam plate both sides and be close to the cavity of the power supply that deflects, consider simultaneously that it often needs to fill the bearing that has a certain amount of lubricated machine oil to lubricate in the power supply that deflects to deflect in the power supply, this scheme has further set up the cushion chamber with the machine oil chamber outside, a cross contamination who is used for keeping apart machine oil chamber and material chamber, and simultaneously, for realizing better detection early warning effect, this scheme still can further increase a liquid detection device in the cushion chamber, a timely change damaged part for monitoring revealing of machine oil and material, avoid cross contamination between the two.

Compared with the prior art, the invention has the beneficial effects that:

1) compared with the traditional high-pressure piston diaphragm pump structure, the structure of the spring return is reduced, and the reciprocating motion of the piston can be realized by the rigid combination of the swash plate and the piston.

2) The arc structure of the piston cavity: the cross section of the arc-shaped cavity is adaptive to the size of the piston, the circle center of the arc-shaped outline is superposed with the deflection center and the central output shaft where the deflection center is located, the piston is guaranteed not to be extruded to press the piston by sliding in the piston cavity, and the transmission relation between the swash plate and the piston is that the front partial displacement corresponds to the rear partial displacement and the left partial displacement corresponds to the right partial displacement.

3) The two pistons arranged on the same diameter line can alternately suck and discharge liquid in the two corresponding piston cavities;

4) the mounting ring structure adopted on the piston reduces the production assembly and maintenance difficulty of products, also provides a deformation space of the piston during deflection, reduces asymmetric friction on the wall of the piston cavity, and is beneficial to prolonging the service life of the device.

5) The piston is also provided with a conical structure, the conical structure enhances the rigidity of the connecting rod, avoids the contact abrasion between a structure on one side of the piston, which is deviated from the piston, and the piston cavity, has a non-negligible effect on the protection of the piston cavity structure, and improves the stability of the device.

Drawings

Fig. 1 is a structural view of a first state of the present invention.

Fig. 2 is a structural view of a second state of the present invention.

Fig. 3 is a structural view of a third state of the present invention.

Fig. 4 is a partial top view of the present invention in three states as shown in fig. 1-3.

Fig. 5 is a view showing the construction of the piston of the present invention.

In the figure, a piston 100, a conical part 110, a mounting ring 120, a one-way valve 130, a swash plate 200, a deflection power source 210, an extension 211, a flexible member 220, an isolation device 230, a connecting rod 300, a piston cavity 400, a pump cavity 500, a material cavity 510, an oil cavity 520 and a gas-liquid cavity 530.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1 and 4, a reciprocating piston 100 is provided with:

a deflection power source 210 for outputting and connecting the swash plate 200 to deflect the swash plate 200 around a center point;

the piston 100 is provided with a connecting rod 300, one end of the connecting rod 300 is directly and fixedly connected with the swash plate 200, and the other end of the connecting rod 300 is fixedly connected with the piston 100;

a piston chamber 400 disposed to correspond to the piston 100;

the swash plate 200 is deflected by the deflection power source 210, the connecting rod 300 reciprocates in a swinging manner along with the swash plate 200, and the connecting rod 300 drives the pistons 100 to slide in a reciprocating manner in the piston cavities 400;

the swash plate 200 is provided with at least one piston 100, and each piston 100 is provided with a piston chamber 400. In order to overcome the problem of loss of the spring device, the invention does not directly consider improvement from the loss caused by reducing the spring reset, but designs the spring device in the aspect of further considering the replaceability; considering that the motion of the swash plate 200 has a reciprocating deflection property, the swash plate 200 is further considered to be linked to the structure of the piston 100; wherein, seen from the fixed connection of one end of the connecting rod 300, the reciprocating deflection of the swash plate 200 is directly transmitted to the connecting rod 300, seen from the fixed connection designed at the other end of the connecting rod 300, on one hand, the back-and-forth motion mode of the swash plate 200 in the main direction is transmitted to the pistons 100 to drive the pistons 100 to move back and forth in the same direction, which can be understood as the 'revolution' of the pistons 100, on the other hand, the pistons 100 can also perform self-deflection at the fixed connection to realize the transformation of the deflection of the swash plate 200 in other directions into the 'rotation' at the spherical pistons, and the unique combination mode of the revolution and the rotation enables the linkage of the swash plate 200 to be transformed into the back-and-forth transmission in the main direction, at this time, only a designer needs to design a piston cavity 400 structure at the later stage to adapt to the deflection, the automatic reset of the pistons 100 is realized, and compared with the traditional piston 100 structure, the periodic change of the pump cavity is realized, and no spring or other reset structures are required to be designed; it should be additionally noted that, in this design concept, the revolution of the piston 100 is determined by the motion mode of the driving swash plate 200, if the swash plate 200 only moves linearly in the main direction, the piston cavity 400 is designed to be a linear cavity, and if the swash plate moves in an arc shape, the piston cavity 400 is designed to be an adaptive arc structure; it should be emphasized that the main direction involved in the present invention may be the final output direction of the power source according to the actual application situation of the designer, or may be one or more of the splitting directions in the output direction.

Preferably, the surface of the swash plate 200 adjacent to the pistons 100 is a circular disc, and all the pistons 100 are distributed on the same diameter of the swash plate 200.

Preferably, the number of the pistons 100 on the swash plate 200 is one or two, wherein two pistons 100 are distributed on the same diameter line of the swash plate 200. In order to achieve a higher power of the pumping power of the fluid, the number of the pistons 100 of the present embodiment may be further set to two, and at most only two pistons 100 on the same diameter, because of the deflection characteristic of the swash plate 200 driving the pistons 100, if a plurality of pistons 100 not on the same diameter are present, the deflection of two of the pistons 100 not on the same diameter has an interlocking effect, causing the piston 100 to press the piston cavity 400 and fail to operate.

Further, the two pistons 100 are equidistant from the center of the swash plate 200.

Preferably, the piston 100 slides back and forth in the piston chamber 400, and the piston 100 is laterally offset in the piston chamber 400, so as to realize the periodic volume change of the piston chamber 400. In order to further realize the periodic variation of the volume of the piston cavity 400, the invention further designs a sliding mode of the piston 100, which comprises the back-and-forth sliding and the lateral deflection of the piston cavity 400, wherein the back-and-forth sliding refers to the back-and-forth sliding in the piston cavity 400 in the main direction and is used for realizing the reciprocating motion to open or close the piston cavity 400 and realize the periodic variation of the volume, and simultaneously, the transmission of the swash plate 200 in other directions is converted into the deflection of the piston 100 in the piston cavity 400, because the piston cavity 400 is adaptive to the piston 100, the deflection of the piston 100 in the piston cavity 400 does not change the clearance sealing state of the piston cavity 400 and does not influence on the output in the main direction, so that the deflection of the swash plate 200 is only output in the main direction, the side wall of the piston cavity 400 is not pressed, and the friction loss between parts is reduced as much as possible.

Preferably, the piston chamber 400 is an arc-shaped chamber. On the basis of the rotary reciprocating motion of the first motion shaft which is vertical to the central output shaft on the horizontal plane, the piston cavity 400 is further provided with a structural characteristic: an arc-shaped chamber which is constructed to accommodate the reciprocating motion centering on the first rotation axis, i.e., the pistons 100 are deflected forward when the swash plate 200 is deflected forward.

Preferably, the arc-shaped contour of the arc-shaped cavity has a radius and a circle center, and the deflection power source 210 has a central output shaft, and the circle center coincides with the central output shaft. For guaranteeing that piston 100 will not extrude piston chamber 400 about relative when sliding and make its variant, design the centre of a circle in the arc chamber into with the coincidence of central output shaft, at this moment, can guarantee that piston 100 and sloping cam plate 200 are concentric or concentric motion in the transmission relation, the two angular velocity is the same, make piston 100 can not have preferred rolling over motion on the basis of sloping cam plate 200 transmission relation, the existence of this kind of rolling over motion can make piston 100 can further extrude piston chamber 400, make piston chamber 400 gradually the variant, be unfavorable for increasing the life of device.

Preferably, the swash plate 200 is driven by the deflection power source 210 to deflect around a deflection center, the deflection center coincides with the circle center, and the deflection center coincides with the central output shaft. On the basis of angular velocity coincidence, the device further reduces the difficulty of device combination, namely the tangential velocities of the two are the same and the tangential velocities of the two are the same, at the moment, the intersection point of the circle of the arc-shaped cavity and the central output shaft needs to be arranged on the surface of the swash plate 200, at the moment, the front-back deflection and the left-right deflection of the piston 100 cannot extrude the piston cavity 400, and the change of the volume in the piston cavity 400 can be driven.

Preferably, the piston 100 has a partially spherical structure, and the contact portion of the piston 100 with the arc-shaped chamber is the spherical structure. In order to realize the sealing performance between the piston cavity 400 and the piston 100, on the basis that the driving connecting rod 300 has a moving path of moving back and forth and deflecting left and right, the invention further provides a structure of the piston 100 relative to the piston cavity 400, wherein the 'partial spherical structure' in the scheme is relative to the structure that the piston 100 is contacted with the piston cavity 400, at this time, in the arc-shaped piston cavity 400, the part that the piston 100 is contacted with the spherical surface is at least provided with a spheroidal surface structure, and the section spherical center angle of the spheroidal surface is greater than or equal to the deflecting moving angle of the left side and the right side of the connecting rod 300, so that the designed gap between the piston 100 and the cavity is kept all the time when the piston 100 moves in the piston cavity 400.

As shown in fig. 1 and 5, the piston 100 is preferably a sphere structure.

Preferably, the arc-shaped cavity is adapted to the ball body; or, the spheroid periphery is equipped with the mounting groove, corresponds the mounting groove is equipped with collar 120, collar 120's arc structure is outstanding the mounting groove sets up, collar 120 with the adaptation of arc chamber internal diameter size sets up. In order to realize the function of the piston 100 under the structure of the ball piston 100, on one hand, the present solution directly sets the size of the piston 100 and the piston cavity 400 to be adapted, so that the piston 100 itself can seal the piston cavity 400, and on the other hand, considering the assembly difficulty of the product in the actual environment, the present solution further designs the spheroid structure as a movably installed mounting ring 120, the mounting ring 120 is loaded outside the center of the piston 100, without the mounting ring 120, it is difficult to achieve the desired adaptation of the spherical piston 100 configuration of the present invention to the arcuate chamber on a production line, the quality requirement of operators for assembling the product is high, and the structure of the mounting ring 120 is adopted, and the characteristic that the mounting ring has a gap in the groove is utilized, the position of the mounting ring 120 is determined by the piston cavity during assembly, which reduces the difficulty of assembly for the operator, the structure can also be compatible with the position tolerance change of the components caused by expansion with heat and contraction with cold and reduce the friction loss between the asymmetric structures.

Preferably, the mounting ring 120 and the mounting groove are in gap elastic damping fit. In order to further reduce the installation difficulty, the scheme further sets a gap fit between the installation ring 120 and the installation groove, and the smaller gap provides a certain microscopic moving space on the basis of ensuring that the installation ring 120 cannot easily fall off, so that the loss of the piston 100 on the wall of the installation ring 120 and the piston cavity 400 caused by deflection is reduced.

Further, the piston 100 is further provided with a check valve 130 for realizing one-way communication in the piston cavity 400.

Preferably, the piston 100 is provided with a ball surface on one side and a tapered portion 110 on the other side, and the tip of the tapered portion 110 is fixedly connected to the connecting rod 300. The scheme is a further improvement on the piston 100, a conical structure is designed at one end of the piston 100 close to the swash plate 200, when the piston 100 deflects, the contact area between the piston 100 and the piston cavity 400 is increased by the conical structure, when the piston 100 normally works, the pressure of one side structure of the deflection of the piston 100 and the pressure of the piston cavity 400 are reduced, and meanwhile, the connection relation of the conical structure enables the transmission of the connecting rod 300 and the piston 100 to be more flexible, the transmission torque of the connecting rod 300 is diffused to the deflection of the conical structure from a fixed connection position, and a certain protection effect is achieved on a ball head.

As shown in fig. 1 to 3, a pump comprising a reciprocating piston 100 comprises a pump chamber 500, a floating swash plate 200 is arranged in the pump chamber 500, an elastic diaphragm device is connected to the periphery of the swash plate 200, the elastic diaphragm device comprises an extension part 211 and a flexible part, and the flexible connection between the swash plate 200 and the pump chamber 500 is realized through the flexible extension part 211 and the flexible part; one side of the elastic diaphragm device close to the deflection power source 210 is provided with an isolating device 230 for isolating the passage into two different cavities by the cavity on the side of the elastic diaphragm device close to the deflection power source 210, the cavities include a material cavity 510 far away from the deflection power source 210, and the isolating device is used for isolating one side close to the deflection power source 210 into two different cavities, which are respectively: an engine oil chamber 520 and a gas-liquid chamber 530, wherein the engine oil chamber 520 is used for arranging the deflection power source 210. The engine oil chamber 520 is close to the deflection power source 210, the gas-liquid chamber 530 is far from the deflection power source 210, the gas-liquid chamber 530 can be filled with gas or liquid, the other side of the elastic diaphragm partitions the channel 500 into the material chamber 510, an oil pumping inlet is arranged in the material chamber 510, so that the material chamber 510 is filled with liquid with certain pressure, the deflection of the piston 100 at the inlet on one side of the piston chamber 400 realizes the communication of the material chamber 510 with the piston chamber 400, the one-way valve 130 and the material chamber 510, and the other side of the piston chamber 400 is an outlet for pumping out the liquid from the material chamber 510. In the structure of the reciprocating piston 100, an elastic diaphragm device parallel to the surface of the swash plate 200 is further added for isolating the material cavities at the two sides of the swash plate 200 and the cavity close to the deflection power source 210, and meanwhile, considering that lubricating oil with certain pressure is often required to be filled in the deflection power source 210 to avoid the friction loss caused by the deflection power source 210, a gas-liquid cavity 530 is further arranged outside the oil cavity 520 and used for isolating the direct contact between the oil cavity 520 and the external environment, and meanwhile, in order to achieve a better detection early warning effect, a monitoring device can be further added in the gas-liquid cavity 530 and used for monitoring the material components or the oil components in the gas-liquid cavity 530 to avoid the cross contamination between the two.

Compared with the prior art, the invention has the beneficial effects that:

1) the pump structure of the piston 100 is reduced in a spring return structure with respect to the conventional pump structure of the piston 100, and the reciprocating motion of the piston 100 is achieved by the combination of the swash plate 200 and the piston 300.

2) Arcuate configuration of piston chamber 400: the size of the cross section of the arc-shaped cavity is adaptive to the size of the piston 100, the circle center of the arc-shaped outline is overlapped with the deflection center and the central output shaft where the deflection center is located, the sliding of the piston 100 in the piston cavity 400 is guaranteed not to extrude the piston 100 to press the piston, and the transmission relation between the swash plate 200 and the piston 100 is that the front partial displacement corresponds to the rear partial displacement and the left partial displacement corresponds to the right partial displacement.

3) Two pistons 100 arranged on the same diameter line can alternately suck and discharge liquid in two corresponding piston cavities 400;

4) the mounting ring 120 structure adopted on the piston 100 reduces the production and assembly difficulty of products, also provides a deformation space for the piston 100 during deflection, reduces asymmetric friction on the wall of the piston cavity 400, and is beneficial to prolonging the service life of the device.

5) The piston 100 is also provided with a conical structure, the conical structure enhances the rigidity of the connecting rod 300, avoids the contact abrasion between the structure at one side of the piston 100 which is deviated and the piston cavity 400, has a non-negligible effect on protecting the structure of the piston cavity 400 and improves the stability of the device.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims

1. A reciprocating piston, comprising:

the piston cavity is adaptive to the piston;

the swash plate is driven by the deflection power source to deflect, the connecting rod reciprocates in a swinging mode along with the swash plate, and the connecting rod drives the pistons to slide in and out in the piston cavities in a reciprocating mode;

the swash plate is provided with at least one piston, and each piston is correspondingly provided with a piston cavity.

2. The reciprocating piston of claim 1 wherein said piston chamber is an arcuate chamber.

3. The reciprocating piston of claim 2 wherein said arcuate chamber has an arcuate profile having a radius and a center, said source of deflection power having a central output axis, said center coinciding with said central output axis.

4. The reciprocating piston of claim 3 wherein said swash plate is deflected by said source of deflection power about a center of deflection which coincides with said center of said circle and said center of deflection coincides with said central output shaft.

5. The reciprocating piston of claim 1, wherein said number of pistons on said swash plate is one or two, wherein two pistons are distributed on the same diameter line of said swash plate.

6. A reciprocating piston as claimed in any one of claims 1 to 4, wherein said piston has a partially spherical configuration.

7. A reciprocating piston as claimed in claim 6, wherein said piston is of spherical configuration.

8. The reciprocating piston of claim 7 wherein said arcuate chamber is adapted to fit said ball; or, the spheroid periphery is equipped with the mounting groove, corresponds the mounting groove is equipped with the collar, the arc structure of collar is outstanding the mounting groove sets up, the collar with the adaptation of arc chamber internal diameter size sets up.

9. The reciprocating piston of claim 8 wherein said mounting ring is in a slotted resilient damped fit with said mounting groove.

10. A pump comprising a reciprocating piston according to any one of claims 1 to 9, wherein said pump includes a pump chamber, said pump chamber is provided with a floating swash plate, said swash plate is further connected at its periphery with an elastic diaphragm device, said elastic diaphragm device is provided with an isolation device at a side close to said power source for deflection, said elastic diaphragm device is used for separating said pump chamber into two chambers, said chambers include a material chamber far from said power source for deflection, said isolation device is used for separating the chamber at a side close to said power source for deflection into two different chambers, respectively: the engine oil cavity is used for setting the deflection power source.