WO2018058758A1

WO2018058758A1 - Piston structure

Info

Publication number: WO2018058758A1
Application number: PCT/CN2016/105768
Authority: WO
Inventors: 罗凤玲
Original assignee: 惠州科赛医疗有限公司
Priority date: 2016-09-27
Filing date: 2016-11-14
Publication date: 2018-04-05
Also published as: CN107882983A

Abstract

A piston structure, comprising a piston rod connector (10) which comprises a connector body (101), a seal ring (102) and a jaw structure (103); the seal ring (102) is sleeved on a first end portion (1011) of the connector body (101); the jaw structure (103) is provided on a second end portion (1012) of the connector body (101) and is opposite to the seal ring (102); the seal ring (102) has an annular seal body (1021) and an annular seal lip (1022); a first end (1022a) of the annular seal lip (1022) is fixed at the outside of the annular seal body (1021), and a gap (1023) is provided between a second end (1022b) of the annular seal lip (1022) and the annular seal body (1021). The piston rod connector (10) further comprises a snap-fit structure configured to fix the seal ring (102) to the first end portion (1011) of the connector body (101). The piston rod connector fixes a seal ring to a connector body by means of a snap-fit structure so as to avoid the separation problem of the seal ring in use.

Description

Piston structure

Technical field

The invention relates to the technical field of pistons, and in particular to a piston structure.

Background technique

At present, the common piston rod connector has a connecting body, a sealing ring and a claw structure. Usually, the sealing ring is sleeved at one end of the connecting body, and the claw structure is disposed at the other end of the connecting body. There is no engaging structure between the sealing ring and the connecting body, and when the piston rod connecting head reciprocates in the piston cavity of the pump body, the sealing ring is liable to be elastically fatigued due to long-term use, and the sealing ring is easily detached from the connecting body.

Summary of the invention

In view of the deficiencies in the prior art, it is an object of the present invention to provide a piston structure.

In order to solve the above technical problem, the present application discloses a piston structure, comprising: a piston rod connecting head, comprising a connecting body, a sealing ring and a claw structure, wherein the sealing ring is sleeved on the first part of the connecting body An end portion, the claw structure is disposed at a second end of the connecting body, and opposite to the sealing ring, the sealing ring has an annular sealing body and an annular sealing lip, and the annular sealing lip portion One end is fixed to an outer side of the annular sealing body, a second end of the annular sealing lip has a gap between the annular sealing body, and the piston rod connecting head further comprises a locking structure, and the engaging structure fixes the A sealing ring is at the first end of the connecting body.

According to an embodiment of the present application, an end surface of the second end of the connecting body is an arcuate groove, and a first end of the plurality of claws of the claw structure is connected to the second end of the connecting body The inner sides of the plurality of claws respectively have arcuate grooves and are in the plurality of claws The second ends respectively form hooks, and the plurality of hooks correspond to a central axis of the connecting body.

According to an embodiment of the present application, a bottom surface of the second end portion of the connecting body is a plane, the claw structure has a plurality of claws, and a first end of the plurality of claws is connected to the second end of the connecting body The second end of the end has a hook, the plurality of hooks corresponding to the central axis of the connecting body, and the surface of each hook corresponding to the second end of the connecting body is a slope.

According to an embodiment of the present application, the claw structure further includes an annular engagement body, the inner side surface of the annular engagement body has an annular convex member, and the annular convex member is disposed at the second end of the connecting body. The first engaging end of the plurality of claws is disposed on the annular engaging body and is annularly arranged, and the second end thereof extends away from the annular engaging body.

According to an embodiment of the present application, an outer side surface of the first end portion of the connecting body has an annular card slot; the engaging structure includes an annular fastener, and the annular fastening member is disposed on an inner side surface of the annular sealing body. The annular sealing body is disposed on an outer side surface of the first end portion, and the annular fastener is disposed on the annular card slot.

According to an embodiment of the present application, the first end of the connecting body has an engaging hole in the middle thereof, and the engaging structure further includes a engaging protrusion, and the engaging protrusion is disposed on the inner side of the annular sealing body. The annular sealing body is disposed on an outer side surface of the first end portion, and the engaging protrusion is disposed on the engaging hole.

According to an embodiment of the present application, the engaging hole includes a first engaging hole and a second engaging hole, and the first engaging hole extends from a top surface of the first end of the connecting body to a middle portion thereof, The second engaging hole is disposed at one end of the first engaging hole near the middle portion and communicates with the first engaging hole, and the inner diameter of the second engaging hole is larger than the first engaging hole The inner diameter of the hole.

According to an embodiment of the present application, the engaging stud includes a fixing post and a locking protrusion, the fixing post is disposed on a closed top surface of the annular sealing body, and the engaging convex portion is disposed An outer diameter of the engaging protrusion is larger than an outer diameter of the fixing post at an end of the fixing post remote from the closed top surface, and the fixing post is located in the first engaging hole, the engaging convex portion Located in the second engaging hole.

According to an embodiment of the present application, the annular sealing body is sleeved on an outer side surface of the first end portion; the engaging structure includes a blocking member, and the blocking member is screwed to the first end of the connecting body And laser welding to the first end of the connecting body and shielding the gap.

According to an embodiment of the present application, the blocking member has a baffle and an engaging post, the engaging post is disposed at one side of the baffle, and the engaging post is screwed to the first end of the connecting body a threaded hole of the portion, the baffle shielding the gap.

According to an embodiment of the present application, the outer diameter of the baffle is larger than the outer diameter of the annular seal body and smaller than the outer diameter of the second end of the annular seal lip.

According to an embodiment of the present application, the baffle and the annular sealing lip have a lateral indentation, and the lateral notch communicates with the gap to form a bent fluid passage.

According to an embodiment of the present application, the engaging convex portion has a thread corresponding to the threaded hole.

According to an embodiment of the present application, the connecting body further includes a middle portion, the middle portion is located between the first end portion and the second end portion, and an outer diameter of the first end portion and the second end portion is smaller than the middle portion The outer diameter.

According to an embodiment of the present application, the outer diameter of the second end of the annular seal lip is larger than the outer diameter of the middle portion of the connecting body.

According to an embodiment of the present application, an outer diameter of the second end of the plurality of claws is larger than an outer diameter of the second end of the annular seal lip.

According to an embodiment of the present application, the claw structure is injection molded on the second end of the connecting body.

According to an embodiment of the present application, the claw structure is formed by press molding on the second end of the connecting body.

According to an embodiment of the present application, the claw structure is an elastic structure.

According to an embodiment of the present application, the material of the seal ring is an elastic material.

According to an embodiment of the present application, the elastic material is PTFE, PPSU, polyetheretherketone (PEEK), modified polyetheretherketone, PE, PP or PVC.

According to an embodiment of the present application, the material of the claw structure is an elastic material.

Compared with the prior art, the present application can obtain the following technical effects:

The piston rod connector of the present application has various structures, and each of the piston rod joints has a small number of parts, a simple structure, and is simple to manufacture. The sealing ring of one of the piston rod connectors is disposed on the annular card slot of the connecting body through the annular fastener, and the sealing ring of the other piston rod connecting head is disposed on the engaging hole and the ring fastener through the engaging protrusion. The double engagement manner of the annular groove of the body, the sealing ring of the two piston rod connectors is stably fixed to the first end of the connecting body, and the problem that the sealing ring falls off when the piston rod connecting head reciprocates in the piston cavity is avoided .

The blocking member of the piston rod connector is assembled to the connecting body by screwing, and then the laser is welded to the connecting body, so that the blocking member is firmly fixed to the connecting body, and the sealing ring is blocked to prevent the sealing ring from coming off. Connector. Moreover, the baffle of the blocking member shields the gap of the sealing ring to prevent the fluid from directly impacting the sealing ring, thereby avoiding damage to the annular sealing lip of the sealing ring.

The arcuate groove of the end surface of the second end of the connecting body of the piston rod connector of the piston structure of the present application and the arcuate groove of the inner side of each of the claws are connected to the piston rod having the spherical protrusion, the piston The cooperation between the rod and the piston rod connector is low, and the piston rod is easy to assemble. The plug connector improves the adaptability of the piston structure, and the piston rod can evenly push the piston rod connector.

DRAWINGS

Figure 1 is a cross-sectional view showing the structure of a piston of a first embodiment of the present application.

Figure 2 is a cross-sectional view showing a piston rod connector of the first embodiment of the present application.

Fig. 3 is a view showing a first use state of the piston structure of the first embodiment of the present application.

Fig. 4 is a view showing a second use state of the piston structure of the first embodiment of the present application.

Fig. 5 is a partial enlarged view of a region A of Fig. 4;

Fig. 6 is a view showing a third use state of the piston structure of the first embodiment of the present application.

Figure 7 is a cross-sectional view showing a piston rod connector of a second embodiment of the present application.

Figure 8 is a cross-sectional view showing a piston rod connector of a third embodiment of the present application.

Fig. 9 is a view showing a state of use of a piston rod structure of a third embodiment of the present application.

Fig. 10 is a partial enlarged view of a B area of Fig. 9.

Figure 11 is a cross-sectional view showing the structure of a piston of a fourth embodiment of the present application.

Figure 12 is a cross-sectional view showing a piston rod joint of a fifth embodiment of the present application.

Figure 13 is a cross-sectional view showing a piston rod connector of a sixth embodiment of the present application.

detailed description

In the following, various embodiments of the present application are disclosed in the drawings. For the sake of clarity, the details of the invention are described in the following description. However, it should be understood that these practical details are not intended to limit the application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, some of the conventional structures and components are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

The use of "first", "second", etc., as used herein, does not specifically mean the order or order, and is not intended to limit the application, but merely to distinguish between components or operations described in the same technical terms. .

1 is a cross-sectional view of a piston structure 1 of a first embodiment of the present application; as shown, the present embodiment provides a piston structure 1 including a piston rod connector 10 and a piston rod 11, The piston rod connector 10 includes a connecting body 101, a sealing ring 102, a snapping structure and a claw structure 103. The connecting body 101 includes a first end portion 1011 and a second end portion 1012. The sealing ring 102 is sleeved on the first end portion 1011. And sealing the sealing ring 102 to the first end portion 1011 by the engaging structure. The claw structure 103 is disposed at the second end portion 1012 and has a plurality of claws 1031. One end of the plurality of claws 1031 is connected to the second end portion 1012, and the other end of the plurality of claws 1031 is from the second end of the connecting body 101. The portion 1012 extends away from the second end portion 1012 of the connector 101. The end surface 10121 of the second end portion 1012 of the connecting body 101 of the present embodiment has an arcuate groove 10122. The inner sides of the plurality of claws 1031 respectively have arcuate grooves 10311 and are respectively formed at the other ends of the plurality of claws 1031. The hooks 10312, the hooks 10312 of each of the claws 1031 correspond to the central axis of the connecting body 101. The piston rod 11 has a spherical convex portion 111, and the curved concave groove 10122 of the end surface 10121 and the curved concave groove 10311 of each of the claws 1031 accommodate the spherical convex portion 111, that is, the curved concave groove 10122 of the end surface 10121 and each of the claws 1031 The bottom surface of the curved recess 10311 corresponds to the surface 1111 of the spherical convex portion 111. When the spherical convex portion 111 is disposed on the claw structure 103, the curved surface of the surface 1111 of the spherical convex portion 111 and the end surface 10121 of the second end portion 1012 The groove 10122 and the bottom surface of the arcuate groove 10311 of each of the claws 1031 are fitted to increase the adaptability of the piston structure 1.

Referring to FIG. 2, which is a cross-sectional view of the piston rod connector 10 of the first embodiment of the present application; as shown, the connecting body 101 of the piston rod connector 10 of the present embodiment has a connection with the first end portion. 1011 and a central portion 1013 of the second end portion 1012, the first end portion 1011 and The outer diameter of the second end portion 1012 is smaller than the outer diameter of the middle portion 1013, and the outer side surface 10111 of the first end portion 1011 of the connecting body 101 has an annular card slot 10112. The outer side surface 10121 of the second end portion 1012 has an annular engagement groove 10122.

The sealing ring 102 is sleeved on the outer side surface 10111 of the first end portion 1011. The sealing ring 102 has an annular sealing body 1021 and an annular sealing lip portion 1022. The annular sealing body 1021 has a closed top surface 10211 and an annular side disposed on the closed top surface 10211. The wall 10212, the engaging structure includes an annular fastener 10213, and the annular fastener 10213 is disposed inside the annular sidewall 10212. The annular sealing lip 1022 has a first end 1022a and a second end 1022b. The first end 1022a is disposed outside the annular sidewall 10212 of the annular sealing body 1021 and is a fixed end; the second end 1022b is a free end, and the ring is annular. The second end 1022b of the sealing lip 1022 has a gap 1023 with the annular side wall 10212 of the annular sealing body 1021, and the outer diameter of the second end 1022b of the annular sealing lip 1022 is greater than the outer diameter of the central portion 1013 of the connecting body 101. When the annular sealing body 1021 of the sealing ring 102 is sleeved on the outer side surface 10111 of the first end portion 1011 , the annular fastening member 10213 of the sealing ring 102 is assembled to the annular card slot 10112 of the connecting body 101 . The sealing ring 102 is fixedly disposed on the first end portion 1011 of the connecting body 101 by the engaging manner of the annular fastener 10213 in the annular card slot 10112.

The claw structure 103 is disposed at the second end portion 1012 of the connecting body 101 and opposed to the sealing ring 102. The claw structure 103 further includes an annular engagement body 1032. The inner side surface 10321 of the annular engagement body 1032 has an annular protrusion 10322. The first ends 1031a of the plurality of claws 1031 are respectively connected to the annular engagement body 1032 and are arranged at intervals. The second end 1031b extends away from the annular engaging body 1032 and forms a free end. The second end 1031b of the plurality of claws 1031 forms an outer diameter larger than the second sealing lip portion 1022 of the sealing ring 102. The outer diameter of the end 1022b. When the claw structure 103 is disposed at the second end portion 1012 of the connecting body 101, the annular engaging body 1032 is disposed outside the second end portion 1012. The side surface 10121 , the annular protrusion 10322 of the annular engagement body 1032 is engaged with the annular engagement groove 10122 , and the plurality of claws 1031 are located at one side of the second end 1012 of the connection body 101 . The claw structure 103 is prevented from being disengaged from the connecting body 101 by the annular protruding member 10322 being engaged with the annular engaging groove 10122 of the second end portion 1012 of the connecting body 101.

The connecting body 101 is made of a metal material, the claw structure 12 is an elastic structure, and the plurality of claws 122 can be gathered and opened. The material of the sealing ring 102 and the claw structure 103 is made of an elastic material, and the elastic material can be PTFE or PPSU. , polyetheretherketone (PEEK), modified polyetheretherketone, PE, PP or PVC. The sealing ring 102 and the jaw structure 103 are telescopically deformable. The method for manufacturing the piston rod connector 10 of the present application is first injection-molded or press-molded with the connecting body 101 as an insert to form the claw structure 103 at the second end portion 1012 of the connecting body 101. The sealing ring 102 is further sleeved on the outer surface 10111 of the first end portion 1011 of the connecting body 101. The manner of fixing the sealing ring 102 and the claw structure 103 and the connecting body 101 has been described above, and will not be described herein. The manufacturing method provided by the present application mainly applies to the injection molding or molding of the claw structure 103 before the first end 1011 of the connecting body 101 is assembled before the sealing ring 102 is assembled, so that the injection molding can be avoided. The high temperature of the molding or molding affects the performance of the sealing ring 102.

Please refer to FIG. 3 to FIG. 6 , which are a first use state diagram, a second use state diagram, a third use state diagram, and a partial enlarged view of the A area of FIG. 4 of the piston structure of the first embodiment of the present application; As shown in the figure, the piston rod connector 10 is disposed in the piston chamber 21 of the pump body 2. The piston chamber 21 has a receiving portion 21a and a displacement portion 21b communicating with the accommodating portion 21a. The accommodating portion 21a has The first opening 211 and the second opening 212 have a diameter larger than the diameter of the second opening 212, so that the space of the accommodating section 21a is tapered. The displacement section 21b has a displacement passage 213, and one end of the displacement passage 213 communicates with the second opening 212, the diameter of which is the same as the diameter of the second opening 212.

The piston rod connector 10 is first disposed on the piston rod 11, and the spherical protrusion 111 of the piston rod 11 It is disposed on the claw structure 103, that is, between the plurality of claws 1031. The piston rod connector 10 is then disposed in the receiving section 21a with the sealing ring 102 facing the second opening 212 with the jaw structure 103 facing the first opening 211, as shown in FIG. The piston rod 11 pushes the piston rod coupling 10, and the piston rod coupling head 10 enters the displacement passage 213 of the displacement section 21b. When the piston rod connector 10 enters the displacement passage 213, the outer diameter of the second end 1022b of the annular sealing lip 1022 of the sealing ring 102 is larger than the inner diameter of the displacement passage 213, and the second end 1022b of the annular sealing lip 1022 abuts the displacement. Side wall 2131 of channel 213. As the fluid enters the displacement passage 213 from the pump body 2, the fluid enters the gap 1023 between the annular seal body 1021 and the second end 1022b of the annular seal lip 1022, and the fluid pushes the second end 1022b of the annular seal lip 1022 and makes the ring The second end 1022b of the sealing lip 1022 abuts against the side wall 2131 of the displacement passage 213. The piston rod connector 10 reciprocates in the displacement passage 213, and the second end 1022b of the annular sealing lip 1022 continuously abuts against the side wall 2131 of the displacement passage 213, so that the second end 112b of the annular sealing lip 1022 and the displacement passage 213 There is no gap between the side walls 2131, and fluid does not leak from between the annular sealing lip 1022 and the side wall 2131 of the displacement passage 213, completely sealing the displacement passage 213.

The outer diameter formed by the second end 1031b of the plurality of claws 1031 of the claw structure 103 is larger than the inner diameter of the displacement passage 213. When the piston rod connecting head 10 enters the displacement passage 213, the claw structure 12 has an elastic structure, and a plurality of The second end 1031b of the claw 1031 is gathered inwardly. When the spherical convex portion 111 of the piston rod 11 is disposed between the plurality of claws 1031, the surface 1111 of the spherical convex portion 111 is in close contact with the second end portion 1012 of the connecting body 101. The curved groove 10122 of the end surface 10121 and the bottom surface of the curved groove 10311 of each of the claws 1031, when the piston rod 11 pushes the piston rod connecting head 10, the spherical convex portion 111 of the piston rod 11 uniformly pushes the connecting body 101 The end surface 10121 of the second end portion 1012 prevents the piston rod connecting head 10 from being displaced within the displacement passage 213 and allows the piston rod connecting head 10 to smoothly move into the displacement passage 213. When the piston rod connector 10 is to move toward the second opening 212, a plurality of jaws The plurality of hooks 10312 of the 1031 abut against the surface 1111 of the spherical protrusion 111 of the piston rod 11, that is, the bottom surface of the curved groove 10311 located above each of the hooks 10312 is in close contact with the spherical protrusion 111 of the piston rod 11. The surface 1111 is such that the spherical convex portion 111 of the piston rod 11 is fixed between the plurality of claws 1031, and when the piston rod 11 is prevented from pulling the piston rod connecting head 10, the spherical convex portion 111 of the piston rod 11 is separated from the plurality of claws 1031.

Please refer to FIG. 7, which is a cross-sectional view of the piston rod connector 10 of the second embodiment of the present application; as shown, the piston rod connector 10 of the present embodiment is different from the piston rod connector of the previous embodiment in that The first end portion 1011 of the connecting body 101 of the present embodiment has an engaging hole 10113. The engaging hole 10113 has a first engaging hole 10113a and a second engaging hole 10113b communicating with the first engaging hole 10113a. The engaging hole 10113a extends from the top surface 10114 of the first end 1011 of the connecting body 101 to the middle portion 1013, and the second engaging hole 10113b is located at one end of the first engaging hole 10113a near the middle portion 1013, and the second engaging hole 10113b The aperture is larger than the aperture of the first engagement hole 10113a.

The engaging structure further includes a locking stud 1023. The engaging stud 1023 is disposed at an inner center of the closed top surface 10211 of the annular sealing body 1021 of the sealing ring 102. The engaging stud 1023 includes a fixing post 10231 and an engaging convex portion 10232. The fixing post 10231 is disposed on the closed top surface 10211, and the engaging convex portion 10232 is disposed at one end of the fixing post 10231 away from the closed top surface 10211 of the annular sealing body 1021. The outer diameter of the engaging convex portion 10232 is larger than the outer diameter of the fixing post 10231. . When the annular sealing body 1021 of the sealing ring 102 is sleeved on the outer surface 10111 of the first end portion 1011, the engaging protrusion 1023 is disposed on the engaging hole 10113, and the fixing post 10231 is located at the first engaging hole 10113a of the engaging hole 10113. The engaging convex portion 11232 is located in the second engaging hole 10113b of the engaging hole 10113. The outer diameter of the engaging convex portion 11232 is larger than the inner diameter of the first engaging hole 10113a, and the engaging stud 1123 is prevented from the engaging hole 10113. Get rid of.

Please refer to FIG. 8 , which is a cross section of the piston rod connector 10 of the third embodiment of the present application. As shown in the figure, the structure of the sealing ring 102 of the piston rod connector 10 of the present embodiment is different from that of the sealing ring of the above embodiment. The engaging structure of the embodiment includes the blocking member 104, so the connection of the embodiment The structure of the first end portion 1011 of the body 10 is also different from the structure of the first end portion of the connector body of the above embodiment. The first end portion 1011 of the connecting body 10 of the present embodiment has a threaded hole 10115 in the middle thereof. The sealing ring 102 is disposed on the outer surface 10111 of the first end portion 1011. The sealing ring 102 has an annular sealing body 1021 and an annular sealing lip 1022. The first end 1022a of the annular sealing lip 1022 is disposed on the annular sealing body 1021. The two ends 1022b are free ends and have a gap 1023 with the annular sealing body 1021. The outer diameter of the second end 1022b of the annular sealing lip 1022 is larger than the outer diameter of the central portion 1013 of the connecting body 101. The blocking member 104 has a baffle 1041 and an engaging post 1042 disposed on a side of the baffle 1041. The engaging post 1042 has a thread 10421 corresponding to the threaded hole 10115, and the thread 10421 of the engaging post 1042 of the blocking member 104 and the connecting body 101 The threaded hole 10115 of the first end portion 1011 is screwed, and the baffle 1041 of the blocking member 104 and the first end portion 1011 of the connecting body 101 are laser welded to fix the blocking member 104 to the first end of the connecting body 101. The portion 1011 can also prevent the blocking member 104 from being detached from the connecting body 101 while the blocking member 104 blocks the sealing ring 102 and prevents the sealing ring 102 from coming off the connecting body 101. The outer diameter of the baffle 1041 of the blocking member 104 is larger than the outer diameter of the annular sealing body 1021 of the sealing ring 102 and smaller than the outer diameter of the second end 1022b of the annular sealing lip 1022, so that the baffle 1041 is shielded from the annular sealing lip 1022. A gap 1023 between the bottom surface of the other baffle 1041 and the top of the annular sealing lip 1022 has a lateral gap 1024 that communicates with the gap 1023 and forms a bent fluid passage.

9 and 10, which are a use state diagram of the piston structure of the third embodiment of the present application and a partial enlarged view of the B area of FIG. 9; as shown, when the piston rod connector 10 enters the pump body 2 The displacement passage 213 of the piston chamber 21 is located between the annular seal body 1021 and the annular seal lip 1022 when the fluid enters from the other end of the displacement passage 213. The baffle 1041 in front of the gap 1023 directs the fluid to flow toward the side wall of the displacement passage 213, and the fluid flows to the outer edge of the baffle 1041 and enters the annular seal body 1021 and the annular seal lip from the lateral notch 1024 along the outer edge thereof. The gap 1023 between 1022 and the above effect is achieved, so that the fluid can be prevented from directly impacting the annular sealing lip 1022 of the sealing ring 102 to avoid damage to the annular sealing lip 1022.

In the manufacturing method of the piston rod connector 10 of the present embodiment, the sealing ring 102 is first sleeved on the outer side surface 10111 of the first end portion 1011 of the connecting body 101, and then the blocking member 104 is assembled on the first end portion 1011 of the connecting body 101. The first end portion 1011 of the blocking member 104 and the connecting body 101 is laser welded to fix the blocking member 104 to the connecting body 101. Finally, the connecting body 101 provided with the sealing ring 102 and the blocking member 104 is injection molded or molded into an insert, and the claw structure 103 is formed on the second end portion 1012 of the connecting body 101.

Please refer to FIG. 11 , which is a cross-sectional view of the piston structure 1 of the fourth embodiment of the present application. As shown, the piston structure 1 of the present embodiment is different from the piston structure of the first embodiment in that the piston rod 11 has a convex portion 112 . The top surface 1121 of the convex portion 112 is a flat surface, and the end surface 10121 of the second end portion 1012 of the connecting body 101 corresponding to the top surface 1121 of the convex portion 112 is a flat surface. The bottom surface 1122 of the convex portion 112 of the piston rod 11 is a sloped surface, and the surface 10313 of the plurality of hooks 10312 corresponding to the bottom surface 1122 of the convex portion 112 of the piston rod 11 is a sloped surface. When the piston rod 11 pulls the piston rod connector 10 to move, the plurality of hooks 10312 of the plurality of claws 1031 abut against the bottom surface 1122 of the convex portion 112 of the piston rod 11, and the plurality of hooks corresponding to the bottom surface 1122 of the convex portion 112 The surface 10313 of the 1031 is in close contact with the bottom surface 1122 of the convex portion 112 of the piston rod 11, so that the convex portion 112 of the piston rod 11 is fixed between the plurality of claws 1031, and the piston rod 11 is prevented when the piston rod 11 is pulled by the piston rod connecting head 10. The convex portion 112 is separated from the plurality of claws 1031.

The end surface 10121 of the second end portion 1012 of the connecting body 101 of the piston rod connector 10 of the present embodiment is a flat surface and the surface 10313 of the plurality of hooks 10312 is inclined. The second embodiment to the third embodiment can be applied to the second embodiment to the third embodiment. The piston rod connector 10 is shown in Figures 12 and 13.

In summary, the piston rod connector of the present application has various structures, and each of the piston rod joints has a small number of parts, a simple structure, and is simple to manufacture. The sealing ring of one of the piston rod connectors is disposed on the annular card slot of the connecting body through the annular fastener, and the sealing ring of the other piston rod connecting head is disposed on the engaging hole and the ring fastener through the engaging protrusion. The double engagement manner of the annular groove of the body, the sealing ring of the two piston rod connectors is stably fixed to the first end of the connecting body, and the problem that the sealing ring falls off when the piston rod connecting head reciprocates in the piston cavity is avoided .

The piston rod of the piston structure of the present application uses a spherical convex portion that abuts an arcuate groove of an end surface of the second end portion of the connecting body of the piston rod connecting head and an arcuate groove of the inner side of each claw The piston rod and the piston rod connector have low cooperation requirements, and the piston rod is easily assembled to the piston rod joint to improve the adaptability of the piston structure, and the piston rod can uniformly push the piston rod joint.

The above description is only for the embodiments of the present application and is not intended to limit the application. Various changes and modifications can be made to the present application by those skilled in the art. Any modifications, equivalents, improvements, etc. made within the spirit and principles of the present application are intended to be included within the scope of the appended claims.

Claims

A piston structure, comprising:

a piston rod connector includes a connecting body, a sealing ring and a claw structure, the sealing ring is sleeved on the first end of the connecting body, and the claw structure is disposed at the second end of the connecting body, and Opposite the sealing ring, the sealing ring has an annular sealing body and an annular sealing lip, the first end of the annular sealing lip is fixed to the outer side of the annular sealing body, and the second sealing lip is second There is a gap between the end and the annular sealing body, and the piston rod connecting head further comprises a snapping structure, and the engaging structure fixes the sealing ring to the first end of the connecting body.
The piston structure according to claim 1, wherein an end surface of the second end of the connecting body is an arcuate groove, and a first end of the plurality of claws of the claw structure is connected to the connecting body a second end portion, the inner sides of the plurality of claws respectively have arcuate grooves, and respectively form hooks at the second ends of the plurality of claws, the plurality of hooks corresponding to the connecting body Central axis.
The piston structure according to claim 1, wherein a bottom surface of the second end of the connecting body is a flat surface, the claw structure has a plurality of claws, and the first ends of the plurality of claws are connected The second end of the connecting body has a hook at a second end thereof, and the plurality of hooks correspond to a central axis of the connecting body, corresponding to each hook of the second end of the connecting body The surface is beveled.
The piston structure according to claim 2 or 3, wherein the claw structure further comprises an annular engaging body, the inner side of the annular engaging body has an annular convex member, and the annular convex member is disposed at the An annular engagement groove of the second end of the connecting body, the plurality of The first ends of the claws are disposed on the annular engaging body and are annularly spaced apart, and the second ends thereof extend away from the annular engaging body.
The piston structure according to claim 4, wherein an outer side surface of the first end of the connecting body has an annular card slot; the engaging structure comprises an annular fastener, and the annular fastener is disposed on the An inner side surface of the annular sealing body, the annular sealing body is disposed on an outer side surface of the first end portion, and the annular fastener is disposed on the annular card slot.
The piston structure according to claim 5, wherein the first end of the connecting body has an engaging hole in the middle, the engaging structure further comprises a engaging stud, and the engaging stud is disposed on the The inner side of the annular sealing body is disposed on an outer side surface of the first end portion, and the engaging protrusion is disposed on the engaging hole.
The piston structure according to claim 6, wherein the engaging hole comprises a first engaging hole and a second engaging hole, and the first engaging hole is from the first end of the connecting body The top surface extends toward the middle portion, and the second engaging hole is disposed at one end of the first engaging hole near the middle portion, and communicates with the first engaging hole, and the inner diameter of the second engaging hole It is larger than the inner diameter of the first engaging hole.
The piston structure according to claim 7, wherein the engaging protrusion comprises a fixing post and a engaging protrusion, and the fixing post is disposed on a closed top surface of the annular sealing body, the engaging convex The portion is disposed at one end of the fixing post away from the closed top surface, the outer diameter of the engaging convex portion is larger than the outer diameter of the fixing post, the fixing post is located in the first engaging hole, and the engaging portion is The convex portion is located in the second engaging hole.
The piston structure according to claim 4, wherein said annular seal a body sleeve is disposed on an outer side surface of the first end portion; the engaging structure includes a blocking member screwed to the first end of the connecting body and laser welded to the connecting body a first end and shielding the gap.
The piston structure according to claim 9, wherein the blocking member has a baffle and an engaging post, the engaging post is disposed at one side of the baffle, and the engaging post is screwed to the a threaded hole of the first end of the connecting body, the baffle shielding the gap.
The piston structure of claim 10 wherein said baffle has an outer diameter that is greater than an outer diameter of said annular seal body and less than an outer diameter of said second end of said annular seal lip.
The piston structure of claim 11 wherein said baffle has a lateral indentation with the annular sealing lip, said lateral indentation communicating with said gap to form a curved fluid passage.
The piston structure according to claim 11, wherein said engaging projection has a thread corresponding to said threaded hole.
The piston structure according to claim 4, wherein said connecting body further comprises a middle portion, said middle portion being located between said first end portion and said second end portion, said first end portion and said second end portion The outer diameter is smaller than the outer diameter of the middle portion.
The piston structure of claim 14 wherein the outer diameter of the second end of the annular sealing lip is greater than the outer diameter of the central portion of the connector.
The piston structure of claim 14 wherein the outer diameter of the second end of the plurality of jaws is greater than the outer diameter of the second end of the annular sealing lip.
The piston structure according to claim 4, wherein the jaw structure is injection molded to the second end of the connecting body.
The piston structure of claim 1 wherein said jaw structure is compression molded to the second end of said connector.
The piston structure of claim 1 wherein said jaw structure is an elastic structure.
The piston structure according to claim 4, wherein the sealing ring is made of an elastic material.
The piston structure according to claim 20, wherein the elastic material is PTFE, PPSU, polyetheretherketone (PEEK), modified polyetheretherketone, PE, PP or PVC.
The piston structure according to claim 4, wherein the material of the claw structure is an elastic material.
The piston structure according to claim 22, wherein the elastic material is PTFE, PPSU, polyetheretherketone (PEEK), modified polyetheretherketone, PE, PP or PVC.