Linkage shaft structure and reciprocating pump with same

Abstract

The present application relates to a reciprocating pump, in particular to a linkage shaft structure and a reciprocating pump with the linkage shaft structure. The linkage shaft structure comprises a linkage shaft extending into a containing cavity, the linkage shaft comprises two coaxially arranged linkage shaft units, the inner ends of the linkage shaft units extend into the containing cavity and are fixed with first telescopic bodies made of flexible material, the outer ends of the linkage shaft units are always located outside the containing cavity and are used for connecting reciprocating moving parts, the first telescopic bodies comprise first bottoms located on the axial sides of the linkage shaft units, and the first bottoms of the two first telescopic bodies are located between the two linkage shaft units and close to each other. The linkage structure of the present application can avoid the contact between the linkage shaft and the cavity wall of the containing cavity, avoid the sliding friction between the linkage shaft and the support structure, thereby as far as possible to avoid the generation of powder or debris, reduce the pollution to the pumped fluid; and can improve the operation efficiency of the reciprocating pump.

Description

Technical Field

[0001] The present invention relates to a reciprocating pump, in particular to a linkage shaft structure and a reciprocating pump having the linkage shaft structure. Background Art

[0002] like Figure 1 The present invention shows an existing reciprocating pump, comprising a pump housing 1, the pump housing 1 comprising a pump head 11 and a pump cover 12 located on both sides of the pump head 11, the pump head 11 having piston chambers 111 on opposite sides, the two piston chambers 111 being connected through an accommodating chamber 112, each piston chamber 111 being slidably fitted with a piston shaft 13, the two piston shafts 13 being connected by a linkage shaft 14 and realizing synchronous linkage, a bellows 15 being provided at each end of the linkage shaft 14, the outer edge of the bellows 15 being connected to the piston chamber 111 The piston chamber 111 is sealed between the pump shaft 13 and the pump cover 12. The pump cover 12 is connected to an air passage 16 for compressed air. Compressed air enters and exits the air chamber 111b through the air passage 16, pushing one bellows 15 to move. When the bellows on one side slides the linkage shaft 14, the linkage shaft 14 drives the other bellows 15 to move, thereby achieving linkage between the two bellows 15. The pump head 11 is provided with an intake port 101 and an outlet 102 for transferring fluid. Both intake port 101 and outlet 102 are equipped with control valves (not shown) that control the alternating connection between intake port 101 and outlet 102 and the two pump chambers 111a. Compressed air drives the two bellows 15 to reciprocate, alternating the volumes of the pump chambers 111a, thereby achieving continuous pumping of the fluid.

[0003] However, during the movement of the linkage shaft, since the linkage shaft is in close contact with the wall of the accommodating chamber, wear powder or debris is easily generated during the movement, and the wear powder or debris is mixed into the pumped fluid, causing the pumped fluid to be contaminated, increasing the loss of the fluid system, and may even cause damage to the fluid system. Summary of the Invention

[0004] The object of the present invention is to provide a linkage shaft structure which can prevent the linkage shaft from contacting the wall of the accommodating chamber, thereby avoiding the generation of powder or debris as much as possible and preventing the pumped fluid from being contaminated.

[0005] To achieve the above object, the present application adopts the following technical scheme: A linkage shaft structure comprises a linkage shaft extending into a containing cavity, the linkage shaft comprises two coaxially arranged linkage shaft units, the inner ends of the linkage shaft units extend into the containing cavity and are fixed with first stretchable bodies made of flexible material, the outer ends of the linkage shaft units are located outside the containing cavity and are used for connecting reciprocating moving parts, the first stretchable bodies comprise first bottoms located on the axial sides of the linkage shaft units, and the first bottoms of the two first stretchable bodies are located between the two linkage shaft units and close to each other.

[0006] The linkage shaft of the present application comprises two coaxially arranged linkage shaft units, the axial sides of the two linkage shaft units are provided with the first bottoms of the first stretchable bodies made of flexible material, the two first bottoms can be close to or even abut against each other, in the case of a reciprocating pump, since the two linkage shaft units are connected with pistons as reciprocating moving parts of the reciprocating pump respectively, and the compressed air in the air passages on both sides exists, the abutment between the two linkage shaft units can be ensured, thereby avoiding the contact and friction between the outer walls of the linkage shaft units and the cavity walls of the containing cavity, and the linkage of the two linkage shaft units can be realized.

[0007] During the movement of the linkage shaft units, the first bottoms of the first stretchable bodies made of flexible material will stretch and contract correspondingly, the relative sliding of the linkage shaft units due to movement is avoided, thereby avoiding the wear of the linkage shaft units and the cavity walls of the containing cavity, avoiding the generation of powder or debris, and finally avoiding the pollution of the pumped fluid.

[0008] As a preferred, the first stretchable body is sleeved on the linkage shaft unit, the first stretchable body further comprises a first stretchable part located on the circumferential outer side of the linkage shaft unit and a first fixed part used for sealing treatment with the cavity wall of the containing cavity, one end of the first stretchable part is connected with the first bottom, the other end of the first stretchable part extends away from the first bottom and is connected with the first fixed part, and the first stretchable part does not contact with the cavity wall of the containing cavity.

[0009] By making the first stretchable body have the first stretchable part, and the first fixed part at the end of the first stretchable part contact and seal with the cavity wall of the containing cavity, the first stretchable body can play a supporting role for the linkage shaft unit. And the first stretchable part does not contact with the cavity wall of the containing cavity, which can further avoid the generation of powder, so as to avoid the pollution of the pumped fluid.

[0010] As a preferred, the first bottoms of the two first stretchable bodies are connected and fixed with each other in a manner of welding, bonding or integral molding.

[0011] By connecting and fixing the two first stretchable bodies, the concentricity of the two first stretchable bodies is ensured, which can effectively avoid the situation that the two linkage shaft units cannot be coaxial and are misaligned with each other due to installation errors or long-term use, and improve the reliability of the reciprocating movement and mutual switching of the linkage shaft structure of the present application.

[0012] Preferably, an elastic body is arranged between the two first telescopic bodies, and the two ends of the elastic body are respectively in abutment or fixed connection with the first bottoms of the two first telescopic bodies.

[0013] In the case where the elastic body is arranged between the two telescopic bodies, the two linkage shaft monomers can realize delayed linkage, can make the overall jetting pressure fluctuation of the reciprocating pump small, and can effectively inhibit the pulsation of the fluid on the jetting side.

[0014] Preferably, the first telescopic part is in a V-shaped bellows shape.

[0015] The first telescopic part is in a V-shaped bellows shape, the pitch of the V-shaped bellows is small and the number of waves is large, compared with the commonly used U-shaped bellows structure, the V-shaped bellows occupies a small volume under the condition of obtaining the same displacement, and the first telescopic body adopting the V-shaped bellows has the advantage of miniaturization, and is more suitable to be installed in the same accommodating cavity as the linkage shaft monomer.

[0016] Preferably, the outer diameter of the first bottom gradually decreases from the side close to the first fixed part to the side away from the first fixed part.

[0017] By making the first bottom in a frustum shape, it can be avoided that the first bottom is too heavy, so as to as far as possible avoid the contact and friction between the first bottom and the cavity wall.

[0018] Preferably, the linkage shaft monomer and the first telescopic body are both made of fluororesin material.

[0019] The two linkage shaft monomers and the two first telescopic bodies are both made of fluororesin material, which can avoid being corroded by the fluid in the process of pumping the fluid, and avoid the influence of pollutants such as ions or particulate matters caused by fluid immersion on the cleanliness of the fluid.

[0020] The application further discloses a reciprocating pump with the linkage shaft structure.

[0021] Preferably, the reciprocating pump comprises a pump shell, a piston shaft having the accommodating cavity in the middle, and a piston cavity in communication with the accommodating cavity arranged on the opposite sides of the piston shaft, one end of the piston shaft as the reciprocating moving part extends into the piston cavity, and a second telescopic body is arranged on the piston shaft, the second telescopic body comprises a second telescopic part on the circumferential outer side of the piston shaft, a second bottom on the axial side of the piston shaft, and a second fixed part for fixing with the piston shaft, and the one end of the piston shaft and the linkage shaft monomer are both fixed with the second bottom of the second telescopic part.

[0022] As preferred, one end of the piston shaft away from the second bottom is sleeved in the shaft sleeve, the shaft sleeve is fixed with the pump shell, one end of the shaft sleeve near the second bottom is provided with an inner limiting protrusion extending to the inner side of the circumference, and the part of the piston shaft in the shaft sleeve is provided with an outer limiting protrusion extending to the outer side of the circumference. The limiting protrusion structure is beneficial to improving the coaxiality of the piston shaft and the linkage shaft monomer during assembly and work, reducing the movement resistance of the telescopic body, and improving the operation efficiency of the reciprocating pump.

[0023] The linkage structure of the present application can avoid the contact between the linkage shaft and the cavity wall of the accommodating cavity, avoid the sliding friction between the linkage shaft and the support structure, thereby avoiding the generation of powder or debris as much as possible, reducing the pollution to the pumped fluid, and reducing the leakage of the pumped fluid in the reciprocating pump caused by the wear of the linkage shaft and the expansion of the assembly gap, thereby improving the operation efficiency of the reciprocating pump. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an existing reciprocating pump.

[0025] Figure 2 It is a structural schematic diagram of the linkage shaft structure of embodiment 1.

[0026] Figure 3 It is Figure 2 It is a structural schematic diagram of the connection between the linkage shaft monomer and the reciprocating movable part.

[0027] Figure 4 It is a structural schematic diagram of the linkage shaft structure of embodiment 3.

[0028] Figure 5 It is a structural schematic diagram of the reciprocating pump of embodiment 4 of the present application.

[0029] Figure 6 It is a structural schematic diagram of the linkage shaft structure of embodiment 5 of the present application. DETAILED DESCRIPTION

[0030] The present application will be further described below according to the drawings and specific embodiments.

[0031] Embodiment 1

[0032] As shown in Figure 2 and Figure 3 The present embodiment discloses a linkage shaft structure for a reciprocating pump, which is arranged in a pump shell, the pump shell includes a pump head 11, the pump head 11 is formed with a left-right-through accommodating cavity 112, the linkage shaft includes two coaxially arranged linkage shaft monomers 2, the inner ends of the linkage shaft monomers 2 extend into the accommodating cavity 112 and are fixed with a first telescopic body 3 made of flexible material, and the outer ends of the linkage shaft monomers 2 are always located outside the accommodating cavity 112 and are fixed with a reciprocating movable part.

[0033] The first telescopic body 3 is sleeved on the outside of the linkage shaft monomer 2. The first telescopic body 3 includes a first telescopic portion 31 located on the circumferential outside of the linkage shaft monomer 2, a first fixed portion 32 for sealing with the cavity wall of the accommodating cavity 112, and a first bottom 33 located on the axial side of the linkage shaft monomer 2. The first bottoms 33 of the two first telescopic bodies 3 are located between the two linkage shaft monomers 2 and offset each other.

[0034] Among them, one end of the first telescopic part 31 is connected to the first bottom 33, and the other end of the first telescopic part 31 extends away from the first bottom 33 and is connected to the first fixed part 32. The first telescopic body 3 is a cylindrical structure with one end open. The opening of the accommodating cavity 112 is formed with an annular groove with an inner diameter larger than the inner diameter of the deviated end of the accommodating cavity 112, and the first fixed part 32 is fixed at the annular groove.

[0035] The first telescopic portion 31 of this embodiment is in the form of a V-shaped bellows. Due to its small pitch and large number of waves, the V-shaped bellows occupies a smaller volume than conventional U-shaped bellows structures while achieving the same displacement. This V-shaped bellows-like structure offers the advantage of miniaturization for the first telescopic body 3, making it more suitable for installation with the linkage shaft unit 2 within the narrow accommodating cavity 112. The first telescopic portion 31, forming the V-shaped bellows, has a plurality of alternating, continuous valleys and peaks along its circumference. The maximum outer diameter is defined by the distance between the tops of two peaks, which are symmetrical along the central axis of the first telescopic portion 31. By ensuring that the maximum outer diameter of the first telescopic portion 31 is smaller than the minimum inner diameter of the accommodating cavity 112, contact or friction between the first telescopic portion 31 and the inner sidewall of the shaft housing 10 during telescoping can be avoided.

[0036] The two first telescopic bodies 3 and the two linkage shaft monomers 2 of this embodiment are made of fluororesin material, which can avoid being corroded by the fluid during the pumping process, and avoid the precipitation of pollutants such as ions or particles due to fluid immersion, which affects the cleanliness of the fluid.

[0037] Depend on Figure 3 As shown, the two reciprocating movable parts of this embodiment are respectively the first reciprocating movable part 13a and the second reciprocating movable part 13b, the two linkage shafts 2 are respectively the first linkage shaft monomer 2a and the second linkage shaft monomer 2b, the first reciprocating movable part 13a is fixed to the first linkage shaft monomer 2a, and the second reciprocating movable part 13b is fixed to the second linkage shaft monomer 2b, and the two first telescopic bodies 3 are respectively the first telescopic body 3a and the first telescopic body 3b, the first telescopic body 3a is sleeved and fixed on the first linkage shaft monomer 2a, and the first telescopic body 3b is sleeved and fixed on the second linkage shaft monomer 2b.

[0038] The two reciprocating members are formed by a combination of a driving member and a driven member; when the first reciprocating member 13a is the driving member, the first reciprocating member 13a drives the first linkage shaft monomer 2a connected thereto to move, and in the process of moving the first linkage shaft monomer 2a, the first telescopic body 3a fixedly connected with the first linkage shaft monomer 2a synchronously extends, the first telescopic body 3b on the other side correspondingly shortens, and drives the second linkage shaft monomer 2b to move, and the second linkage shaft monomer 2b drives the second reciprocating member 13b to move correspondingly through movement.

[0039] In the process of moving the first linkage shaft monomer 2a and the second linkage shaft monomer 2b, the first telescopic body 3a and the first telescopic body 3b correspondingly extend and contract to avoid the relative sliding of the linkage shaft monomers due to movement, and when the first telescopic body 3a and the first telescopic body 3b extend and contract, since the first telescopic body 3a and the first telescopic body 3b are not in contact or friction with the cavity wall of the accommodating cavity 112 of the pump shell, the generation of wear powder or debris is avoided. After the first linkage shaft monomer 2a and the second linkage shaft monomer 2b move to the set position, the first reciprocating member 13a and the second reciprocating member 13b are switched with each other, so that the first reciprocating member 13a is switched to the driven member and the second reciprocating member 13b is switched to the driving member, and the first linkage shaft monomer 2a and the second linkage shaft monomer 2b move in the opposite direction inside the pump shell and drive the first reciprocating member 13a as the driven member to move correspondingly; through the above-mentioned operation, the linkage between the two reciprocating members can be continuously realized.

[0040] In the embodiment, the first bottoms 33 of the two first telescopic bodies 3 are fixedly connected with each other. The first bottoms 33 of the two first telescopic bodies 3 are fixedly connected, so that the two linkage shaft monomers 2 can always keep coaxial during reciprocating movement and mutual switching, which is more reliable and can effectively avoid the situation that the two linkage shaft monomers 2 are not coaxial and are misaligned with each other due to installation error or long-term use, thereby improving the reliability of reciprocating movement and mutual switching of the linkage shaft structure.

[0041] Embodiment 2

[0042] A reciprocating pump, comprising a pump shell, the pump shell comprising a pump head and pump covers located on both sides of the pump head, the pump head having a piston cavity on each of the opposite sides, and each piston cavity slidably fitted with a piston shaft, and the two piston shafts are synchronously linked by the linkage shaft structure of embodiment 1.

[0043] Embodiment 3

[0044] A linkage shaft structure, comprising a first linkage shaft monomer and a second linkage shaft monomer, the first linkage shaft monomer and the second linkage shaft monomer being connected with each other through a first telescopic body and a second telescopic body. Figure 4As shown, the difference between this embodiment and embodiment 1 is that an elastic body 4 is provided between the two first telescopic bodies 3 , and both ends of the elastic body 4 are respectively abutted against or fixedly connected to the first bottom 33 of one first telescopic body 3 , and the elastic body 4 is a metal spring.

[0045] Depend on Figure 5 As shown, under the connection method of Example 2, delayed linkage can be achieved between the first linkage shaft monomer 2a and the second linkage shaft monomer 2b. For example, when the first reciprocating member 13a drives the first linkage shaft monomer 2a to begin moving toward the first telescopic body 3a, the first linkage shaft monomer 2a first compresses the elastic body 4 through the first bottom portion 33 of the first telescopic body 3a, and then applies a thrust to the second linkage shaft monomer 2b, driving it to move, thereby achieving delayed linkage between the first linkage shaft monomer 2a and the second linkage shaft monomer 2b.

[0046] Example 4

[0047] A reciprocating pump includes the linkage shaft structure of embodiment 3. Figure 5 As shown, the reciprocating pump of this embodiment includes a pump housing 1, which includes a pump head 11 and pump covers 12 located on both sides of the pump head 11. The pump head 11 has an accommodating cavity 112 located in the middle. The pump head 11 has piston cavities 111 on opposite sides. The two piston cavities 111 are connected to the accommodating cavity 112. One end of a piston shaft 13, which serves as a reciprocating moving part, extends into the piston cavity 111. The other end of the piston shaft 13 is slidably fitted into a shaft sleeve 18, which is fixed to the pump cover 12. The piston shaft 13 of this embodiment is made of a metal material such as stainless steel.

[0048] The piston shaft 13 is provided with a second telescopic body 5. The second telescopic body 5 includes a second telescopic portion 51 located circumferentially outside the piston shaft 13, a second bottom portion 53 located axially on the piston shaft 13, and a second fixing portion 52 for fixing to the pump housing 1. One end of the piston shaft 13 and the linkage shaft unit 2 are both fixed to the second bottom portion 53 of the second telescopic body 5. The end of the sleeve 18 near the second bottom portion 53 is provided with an inner limiting protrusion 181 extending circumferentially inward, and the portion of the piston shaft 13 located within the sleeve 18 has an outer limiting protrusion 131 extending circumferentially outward. The second bottom portion 53 is provided on both sides with a fixing hole for mating with the piston shaft 13 and a mating hole for mating with the linkage shaft unit 2. The second telescopic body 5 of this embodiment is also made of fluororesin.

[0049] The reciprocating pump of the embodiment has a detection device 17 for detecting displacement of the piston shaft 13 as a reciprocating moving part. Before the first linkage shaft body 2a moves to the set position, the first reciprocating moving part 13a and the second reciprocating moving part 13b can be switched with each other by the detection device 17, so that the first reciprocating moving part 13a is switched to a driven part and the second reciprocating moving part 13b is switched to a driving part. The second reciprocating moving part 13b drives the second linkage shaft body 2b to move in the opposite direction. The elastic body 4 is further compressed and shrunk. Therefore, there is a stage in which the first linkage shaft body 2a and the second linkage shaft body 2b move towards the center of the elastic body 4 at the same time. With further movement of the second linkage shaft body 2b, the elastic body 4 releases part of the accumulated elastic potential energy, the elastic body 4 is elongated, the first telescopic body 3a is correspondingly shortened, and the first linkage shaft body 2a is driven to move towards the direction of the first telescopic body 3a. Through the above-mentioned operation, the delayed linkage between the two piston shafts 13 as reciprocating moving parts can be continuously realized, different forms of reciprocating movement are realized, and the linkage demand of special working conditions is met.

[0050] The piston cavity 111 of the embodiment is divided into the gas chamber 111b and the pump chamber 111a which are not connected to each other by the second telescopic body 5, and the gas chamber 111b and the pump chamber 111a on both sides of the pump shell 1 are relatively symmetrical. The suction inlet 101 and the discharge outlet 102 for transferring fluid are respectively arranged on the axis of the pump head 1, and control valves (not shown in the figure) are arranged in the suction inlet 101 and the discharge outlet 102. The control valves control the suction inlet 101 and the discharge outlet 102 to alternately communicate with the two pump chambers 111a, so that the fluid suction and discharge are realized at the same time, and the fluid suction into the pump and the fluid discharge out of the pump are prevented from being mixed. The length of the linkage shaft body 2 (the first linkage shaft body 2a and the second linkage shaft body 2b) is greater than the length of the first telescopic body 3, and the ends of the two linkage shaft bodies 2 away from each other are located in the pump chamber 111a and are fixedly connected with the second bottom 53 of the second telescopic body 5 in the piston cavity 111. The two piston shafts 13 (the first reciprocating moving part 13a and the second reciprocating moving part 13b) are coaxially arranged with the shaft sleeve 18 and the linkage shaft body 2. The compressed air enters the pump chamber 111a of the piston cavity 111 through the air passage 16, or the compressed air in the gas chamber 111b is discharged out of the pump.

[0051] In the reciprocating pump of the present embodiment, when pumping liquid, the pumped liquid fills the two pump chambers 111a and the inner space of the two first stretchable bodies 3 connected with the pump chambers 111a. The reciprocating pump is provided with a control valve (an electromagnetic reversing valve) used in conjunction. The signal line of the detection device 17 is electrically connected with the electromagnetic reversing valve. The outer end of the air channel 16 is connected with the electromagnetic reversing valve through an external pipeline. The electromagnetic reversing valve is also connected with compressed air. Under the control of the electromagnetic reversing valve, the compressed air flows towards the left air chamber 111b in the reciprocating pump. The compressed air is introduced into the left air chamber 111b through the air channel 16. The pressure in the left air chamber 111b rises with the introduction of the compressed air, thereby driving the left second stretchable body 5 to elongate and moving the second bottom 53 to the right. At this time, the left 111b is correspondingly reduced, the pressure in the left 111b rises, and the control valve is forced to connect the discharge port 102 with the pump chamber 111a. The liquid in the pump chamber 111a is discharged from the discharge port 102.

[0052] In the process of moving the second bottom 53 towards the center of the pump head 11, the second bottom 53 drives the first linkage shaft monomer 2a to move together. In the process of moving the first linkage shaft monomer 2a, the first stretchable body 3a fixedly connected with the first linkage shaft monomer 2a synchronously elongates, the first stretchable body 3b on the other side correspondingly shortens, and drives the second linkage shaft monomer 2b to move. The moving direction of the second linkage shaft monomer 2b is the direction of stretching out of the first stretchable body 3b. In the above process of moving the first linkage shaft monomer 2a and the second linkage shaft monomer 2b, the two first stretchable bodies 3 (the first stretchable body 3a and the first stretchable body 3b) correspondingly stretch and contract, avoiding the relative sliding of the shaft due to movement. When the flexible stretchable body 30 stretches and contracts, the side wall 32 of the flexible stretchable body 30 does not contact or rub with the inner side wall of the shaft shell 10, thereby avoiding the generation of wear powder or debris.

[0053] The second linkage shaft monomer 2b drives the second bottom portion 53 on the right side to move in a direction away from the first linkage shaft monomer 2a. During the movement of the second bottom portion 53 on the right side, the second telescopic body 5 on the right side is shortened, and the pump chamber 111a on the right side is expanded accordingly. The pressure in the pump chamber 111a drops, thereby forcing the control valve to connect the suction port 16 with the pump chamber 111a, and the pumped liquid is introduced into the pump chamber 111a from the suction port 101; at the same time, the air chamber 111b is reduced accordingly, and the compressed air in the air chamber 111b flows out through the air channel 16 and is introduced into the electromagnetic reversing valve. ; During the movement of the second bottom 53, the second bottom 53 also drives the piston shaft 13 to move, and the piston shaft 13 continuously slides into the sleeve 18. When the metal piston shaft 13 slides to the set position close to the detection device 17, the detection device 17 generates a control signal and transmits it to the electromagnetic reversing valve via the signal line to switch the flow direction of the compressed air between the different air chambers on both sides, so that the second telescopic bodies 5 on both sides are alternately extended and retracted, and the pump chambers on both sides perform alternate suction and discharge actions; by cycling the above operations, the reciprocating pump can continuously pump liquid.

[0054] Example 5

[0055] A linkage shaft structure, such as Figure 6 As shown, this embodiment has the following differences compared with the embodiment 1: the outer diameter of the first bottom portion 33 of the first telescopic body 3 gradually decreases from the side close to the first fixing portion 32 to the side away from the first fixing portion 32 .

[0056] After the first telescopic body 3 is fixedly installed on the inner side of the accommodating cavity 112, the first telescopic body 3 is in a horizontal state. However, since the first telescopic body 3 adopts a V-shaped bellows structure, its rigidity is relatively small, and when the first telescopic body 3 is made of fluororesin, the rigidity of the first telescopic body 3 is further reduced. When the first bottom 33 of the first telescopic body 3 is too heavy, the first bottom 33 will have a certain linear displacement perpendicular to the direction of its central axis, which may cause the first telescopic body 3 to contact or rub against the wall of the accommodating cavity 112. By adjusting the structure of the first bottom 33 of the first telescopic body 3 and setting the first bottom 33 to be in an inverted cone shape, it is possible to avoid the first bottom 33 of the first telescopic body 3 being too heavy, and further avoid the first telescopic body 3 from contacting or rubbing against the wall of the accommodating cavity 112.

[0057] The linkage structure of this embodiment can prevent the linkage shaft from contacting the wall of the accommodating chamber, and avoid sliding friction between the linkage shaft and the supporting structure, thereby avoiding the generation of powder or debris as much as possible and reducing contamination of the pumped fluid; and can reduce the internal leakage of the reciprocating pump caused by wear of the linkage shaft and expansion of the assembly gap of the pumped fluid, thereby improving the operating efficiency of the reciprocating pump.

Claims

1. A linkage shaft structure comprising a linkage shaft which extends into a housing cavity, characterized by: The linkage shaft comprises two coaxially arranged linkage shaft units, the inner ends of the linkage shaft units extend into the accommodating cavity and are fixed with the first elastic bodies made of flexible material, the outer ends of the linkage shaft units are located outside the accommodating cavity and are used for connecting the reciprocating members, the first elastic bodies comprise first bottoms located at the axial ends of the linkage shaft units, the first bottoms of the two first elastic bodies are located between the two linkage shaft units and are close to each other, the first elastic bodies are sleeved outside the linkage shaft units, the first elastic bodies further comprise first elastic portions located at the circumferential outer sides of the linkage shaft units and first fixed portions used for sealing treatment with the cavity walls of the accommodating cavities, one end of the first elastic portion is connected with the first bottom, the other end of the first elastic portion extends away from the first bottom and is connected with the first fixed portion, and the first elastic portion does not contact the cavity wall of the accommodating cavity.

2. The linkage shaft arrangement of claim 1, wherein: The first bottoms of the two first elastic bodies are connected and fixed with each other.

3. The linkage shaft arrangement of claim 1, wherein: Elastic bodies are arranged between the two first elastic bodies, and the two ends of each elastic body are connected with the first bottoms of the two first elastic bodies.

4. The linkage shaft arrangement of claim 1, wherein: The first elastic portion is in the shape of a V-shaped bellows.

5. The linkage shaft arrangement according to claim 1 or 4, characterized in that: The outer diameter of the first bottom gradually decreases from the side close to the first fixed portion to the side away from the first fixed portion.

6. The linkage shaft arrangement of claim 1, wherein: The linkage shaft units and the first elastic bodies are made of fluororesin material.

7. A reciprocating pump having the linkage shaft structure according to any one of claims 1 to 6.

8. The reciprocating pump of claim 7, wherein: The pump shell has the accommodating cavity located at the middle portion, the pump shell is provided with a piston cavity in communication with the accommodating cavity at each of the opposite sides, one end of a piston shaft serving as the reciprocating member extends into the piston cavity, a second elastic body is sleeved outside the piston shaft, the second elastic body comprises a second elastic portion located at the circumferential outer side of the piston shaft, a second bottom located at the axial end of the piston shaft, and a second fixed portion used for fixing with the pump shell, and the one end of the piston shaft and the linkage shaft unit are fixed with the second bottom of the second elastic body.

9. The reciprocating pump of claim 8, wherein: The one end of the piston shaft away from the second bottom is slidingly fitted in a shaft sleeve, the shaft sleeve is fixed with the pump shell, the one end of the shaft sleeve close to the second bottom is provided with an inner limiting protrusion extending to the circumferential inner side, and the part of the piston shaft located in the shaft sleeve has an outer limiting protrusion extending to the circumferential outer side.

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