A pressure pump sealing structure, a pressure pump head and a pressure pump

Abstract

The embodiments of the present invention provide a pressure pump sealing structure, a pressure pump head and a pressure pump, which relate to the field of medical device technology. The pressure pump sealing structure provided by the embodiments of the present invention includes a connecting portion and a sealing portion that are interconnected. The connecting portion is used to be fixedly connected to the cylinder head. The sealing portion has a through hole for the piston rod to pass through, and the through hole is used to seal with the piston rod, thereby achieving sealing between the piston rod and the outside; the sealing portion is used to extend into the piston cavity of the cylinder head, and the outer wall of the sealing portion is used to seal with the cylinder head, thereby achieving sealing between the cylinder head and the outside. The pressure pump sealing structure can achieve sealing between the piston rod and the outside and between the cylinder head and the outside through a sealing portion, and has a simple structure and is easy to install.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a pressure pump sealing structure, a pressure pump head and a pressure pump. Background Art

[0002] A pump is a machine that transports fluid or pressurizes fluid. Currently, the commonly used pump uses a piston structure to reciprocate in the cylinder head to increase the fluid in the cylinder head, thereby driving the fluid movement. Therefore, during the operation of the pump, it is particularly important to prevent fluid leakage and ensure a good sealing effect.

[0003] In order to ensure the sealing effect, existing pumps often set up complex sealing structures between the cylinder head and the piston rod. The setting of multiple layers of sealing rings greatly increases the risk of leakage and makes the installation process more complicated. Summary of the invention

[0004] The purpose of the present invention includes, for example, providing a pressure pump sealing structure, which can improve the technical problems of complex sealing structure and difficult installation in the prior art.

[0005] The purpose of the present invention also includes providing a pressure pump head, which includes the above-mentioned pressure pump sealing structure.

[0006] The purpose of the present invention also includes providing a pressure pump, which includes the above-mentioned pressure pump head.

[0007] The embodiments of the present invention can be implemented as follows:

[0008] An embodiment of the present invention provides a pressure pump sealing structure for a pressure pump, the pressure pump comprising a piston rod and a cylinder head, the cylinder head having a piston cavity that slides with the piston rod, the pressure pump sealing structure comprising a connecting portion and a sealing portion that are connected to each other, the connecting portion being used to be fixedly connected to the cylinder head; the sealing portion having a through hole for the piston rod to pass through, and the through hole being used to seal with the piston rod; the sealing portion being used to extend into the piston cavity, and the outer wall of the sealing portion being used to seal with the cylinder head.

[0009] Optionally, the sealing portion includes a body, and the through hole is arranged on the body;

[0010] The body has an inner wall corresponding to the through hole, the sealing portion further comprises a first sealing protrusion arranged on the inner wall, the first sealing protrusion is annular, and the first sealing protrusion is used for sliding sealing with the piston rod; and / or,

[0011] The sealing portion further comprises a second sealing protrusion arranged on the outer peripheral wall of the body, the second sealing protrusion is annular, and the second sealing protrusion is used for sealingly cooperating with the wall surface of the cylinder head.

[0012] Optionally, there are multiple first sealing protrusions, and the multiple first sealing protrusions are sequentially spaced along the axial direction of the through hole;

[0013] And / or, there are multiple second sealing protrusions, and the multiple second sealing protrusions are arranged in sequence and spaced apart along the axial direction of the outer peripheral wall.

[0014] Optionally, the sealing portion includes an annular body and a connecting protrusion protruding from the end surface of the body; the connecting portion is provided with a snap-fit ​​groove corresponding to the connecting protrusion, and the connecting protrusion snaps into the snap-fit ​​groove to fix the sealing portion to the connecting portion.

[0015] Optionally, the connecting protrusion includes a first protrusion portion and a second protrusion portion, and one end of the first protrusion portion away from the second protrusion portion is fixedly connected to the body; the second protrusion portion protrudes out of the first protrusion portion along the circumference of the body; the first protrusion portion and the second protrusion portion are both engaged with the snap-in groove.

[0016] Optionally, the connecting protrusion also includes a third protrusion portion, which is fixedly connected to the first protrusion portion, and the third protrusion portion and the second protrusion portion are relatively arranged on both sides of the first protrusion portion; the first protrusion portion, the second protrusion portion and the third protrusion portion are all engaged with the snap-in groove.

[0017] Optionally, the first protrusion extends along the axial direction of the body.

[0018] Optionally, the connecting portion has a first connecting section and a second connecting section that are connected to each other; the second connecting section is used to be fixedly connected to the cylinder head; the first connecting section has a first end face located away from one end of the second connecting section, and the snap-in groove is opened on the peripheral wall of the first connecting section and is arranged through the first end face.

[0019] Optionally, when the connecting protrusion is engaged with the engaging groove, the end surface is in contact with the first end surface.

[0020] Optionally, the first connecting section and the second connecting section are integrally formed.

[0021] Optionally, there are multiple connecting protrusions, and the multiple connecting protrusions are arranged at intervals along the circumference of the main body; there are multiple snap-in grooves, and the multiple snap-in grooves are snap-fitted with the multiple connecting protrusions in a one-to-one correspondence.

[0022] An embodiment of the present invention further provides a pressure pump head. The pressure pump head comprises a cylinder head, a piston rod and any one of the above pressure pump sealing structures; the cylinder head has a piston cavity, the piston cavity has an opening for the piston rod to enter the piston cavity, and the pressure pump sealing structure is arranged at the opening to seal the opening.

[0023] Optionally, the cylinder head has a wall surface corresponding to the piston cavity, and a protrusion is arranged on the wall surface; the connecting part has a first peripheral wall matching with the wall surface, and a groove is arranged on the first peripheral wall, and the protrusion is snap-fitted with the groove.

[0024] Optionally, there are multiple protrusions, and the multiple protrusions are arranged at intervals along the circumference of the wall surface, and the multiple protrusions are all snap-fitted with the groove; the groove is an annular groove.

[0025] Optionally, a fixing piece is further included, the cylinder head is provided with a first assembly hole, the connecting portion is provided with a second assembly hole, and the fixing piece cooperates with both the first assembly hole and the second assembly hole to fix the connecting portion to the cylinder head.

[0026] An embodiment of the present invention further provides a pressure pump, which includes any one of the above-mentioned pressure pump heads.

[0027] The beneficial effects of the pressure pump sealing structure, pressure pump head and pressure pump of the embodiments of the present invention include, for example:

[0028] An embodiment of the present invention provides a pressure pump sealing structure, which includes a connecting portion and a sealing portion that are connected to each other. The connecting portion is used to be fixedly connected to the cylinder head. The sealing portion has a through hole for the piston rod to pass through, and the through hole is used to seal with the piston rod, thereby realizing the sealing of the piston rod and the outside; the sealing portion is used to extend into the piston cavity of the cylinder head, and the outer wall of the sealing portion is used to seal with the cylinder head, thereby realizing the sealing of the cylinder head and the outside. The pressure pump sealing structure can realize the sealing of the piston rod and the outside and the cylinder head and the outside through a sealing portion, and has a simple structure and is easy to install.

[0029] The embodiment of the present invention further provides a pressure pump head, which includes the pressure pump sealing structure. Since the pressure pump head includes the pressure pump sealing structure, it also has the beneficial effects of simple structure and convenient installation.

[0030] An embodiment of the present invention further provides a pressure pump, which includes the above-mentioned pressure pump head, and thus also has the beneficial effects of simple structure and convenient installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic cross-sectional structure diagram of a pressure pump head provided by an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A magnified schematic diagram of the local structure at position II in the middle;

[0034] Figure 3 A schematic structural diagram of a sealing portion in a pump head of a pressure pump provided by an embodiment of the present invention;

[0035] Figure 4 A schematic cross-sectional structure diagram of a sealing portion in a pump head of a pressure pump provided by an embodiment of the present invention;

[0036] Figure 5 A schematic structural diagram of a first sealing structure in a pump head of a pressure pump provided by an embodiment of the present invention;

[0037] Figure 6 A schematic structural diagram of a connecting portion in a pressure pump head provided by an embodiment of the present invention;

[0038] Figure 7 for Figure 3 A magnified schematic diagram of the local structure at position VII in the middle;

[0039] Figure 8 A schematic diagram of the partial structure of a cylinder head in a pressure pump head provided by an embodiment of the present invention;

[0040] Fig. 9 for Figure 1 Enlarged view of the local structure at point IX.

[0041] Icons: 10-pressure pump head; 100-cylinder head; 111-piston chamber; 112-wall; 113-first opening; 114-second opening; 115-first assembly hole; 116-bump; 117-guide slope; 200-piston structure; 211-piston rod; 212-piston head; 213-sealing groove; 214-sealing ring; 215-free end; 216-driving end; 300-pressure pump sealing structure; 310-first sealing structure; 320-second sealing structure; 330-connecting part; 331-first connecting section; 332-second connecting section; 333-second connecting section; 334-second connecting section; 335-second connecting section; 336-second connecting section; 337-second connecting section; 338-second connecting section; 339-second connecting section; 340-second connecting section; 341-second connecting section; 342-second connecting section; 343-second connecting section; 344-second connecting section; 345-second connecting section; 346-second connecting section; 347-second connecting section; 348-second connecting section; 349-second connecting section; 350-second connecting section; 351-second connecting section; 352-second connecting section; 353-second connecting section; 354-second connecting section; 355-second connecting section; 356-second connecting section; 357-second connecting section; 358-second connecting section; 359-second connecting section; 360-second connecting section; 361-second connecting section; 362-second connecting section; 363-second connecting section; 364-second connecting section; 365-second connecting section; 366-second connecting section; 367-second connecting section; 3-middle section; 334-clamping groove; 335-second assembly hole; 336-through hole; 337-groove; 338-matching portion; 3381-sliding hole; 339-first end face; 340-sealing portion; 341-connecting protrusion; 342-first protruding portion; 343-second protruding portion; 344-third protruding portion; 346-body; 347-through hole; 348-peripheral wall; 349-inner wall; 350-first sealing protrusion; 351-second sealing protrusion; 352-second end face; 353-first matching surface; 354-second matching surface; 400-fixing member. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0047] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0048] Figure 1 This is a schematic cross-sectional structure diagram of the pressure pump head 10 provided in this embodiment, Figure 2 for Figure 1 The enlarged schematic diagram of the local structure at II in the middle. Figure 3 This is a schematic diagram of the structure of the sealing portion 340 in the pressure pump head 10 provided in this embodiment. Figure 1-Figure 3 ,This embodiment provides a pressure pump sealing structure 300, and accordingly, provides a pressure pump head 10 and a pressure pump (not shown).

[0049] The pressure pump sealing structure 300 includes a connecting portion 330 and a sealing portion 340 which are connected to each other. The connecting portion 330 is used to be fixedly connected to the cylinder head 100. The sealing portion 340 has a through hole 347 for the piston rod 211 to pass through, and the through hole 347 is used to seal with the piston rod 211, thereby achieving the sealing between the piston rod 211 and the outside; the sealing portion 340 is used to extend into the piston cavity 111 of the cylinder head 100, and the outer wall of the sealing portion 340 is used to seal with the cylinder head 100, thereby achieving the sealing between the cylinder head 100 and the outside. The pressure pump sealing structure 300 can achieve the sealing between the piston rod 211 and the outside and the cylinder head 100 and the outside through a sealing portion 340, and has a simple structure and is easy to install.

[0050] The pressure pump head 10 includes the pressure pump sealing structure 300 mentioned above, and the pressure pump head 10 also includes a cylinder head 100 and a piston rod 211. The cylinder head 100 and the piston rod 211 are sealed by the pressure pump sealing structure 300 to prevent leakage of the fluid in the piston chamber 111.

[0051] The pressure pump includes the above-mentioned pressure pump head 10, and also includes a driving member (not shown) connected to the piston rod 211, which drives the piston rod 211 to reciprocate in the piston chamber 111 to pressurize the fluid in the piston chamber 111 and promote fluid movement.

[0052] The pressure pump head 10 provided in this embodiment is further described below:

[0053] Please continue to refer to Figure 1 and Figure 2In this embodiment, the pressure pump head 10 includes a pressure pump sealing structure 300, a cylinder head 100 and a piston structure 200. The cylinder head 100 has a piston cavity 111, and one end of the piston cavity 111 has an opening, which is a first opening 113. When installed, the piston structure 200 extends into the piston cavity 111 from the first opening 113 and slides with the piston cavity 111. The first opening 113 is provided with a pressure pump sealing structure 300, which is a first sealing structure 310, and the first opening 113 is closed by the first sealing structure 310.

[0054] Specifically, the piston cavity 111 is arranged through the cylinder head 100, that is, both ends of the piston cavity 111 have openings connected to the outside, and the two openings are respectively a first opening 113 and a second opening 114 arranged opposite to the first opening 113. A pressure pump sealing structure 300 is arranged at the second opening 114, and the pressure pump sealing structure 300 is a second sealing structure 320. It should be noted that in the description of this embodiment, "outside" refers to the space outside the piston cavity 111. The piston structure 200 includes a piston rod 211, a piston head 212 and a sealing ring 214. The piston head 212 is formed by the peripheral wall of the middle part of the piston rod 211 protruding radially outward, and the sealing ring 214 is sleeved on the piston head 212. The two ends of the piston rod 211 are respectively slidably matched with the first sealing structure 310 and the second sealing structure 320, and the driving end 216 of the piston rod 211 passes through the first sealing structure 310 and is transmission-connected with the driving member outside the cylinder head 100, so that the piston structure 200 slides relative to the cylinder head 100, the first sealing structure 310 and the second sealing structure 320 under the driving of the driving member. The cylinder head 100 has a wall surface 112 corresponding to the piston cavity 111, and the sealing ring 214 is sealed with the wall surface 112, so that the piston cavity 111 is divided into two chambers located on both sides of the piston head 212, and the two chambers are respectively the first chamber and the second chamber. When the piston structure 200 slides relative to the cylinder head 100 under the driving of the driving member, the sealing ring 214 slides relative to the wall surface 112, and the volume of the first chamber and the second chamber increases or decreases accordingly.

[0055] Furthermore, a sealing groove 213 is provided on the peripheral wall of the piston head 212 away from one end of the piston rod, and a sealing ring 214 is clamped in the sealing groove 213, and the sealing ring 214 is limited by the sealing groove 213. The outer periphery of the sealing ring 214 protrudes from the sealing groove 213 and is sealed with the wall surface 112 of the cylinder head 100, so as to achieve effective separation of the first chamber and the second chamber. Optionally, the number of the sealing rings 214 is two, and two sealing grooves 213 are arranged on the piston head 212 at intervals, and the two sealing rings 214 are arranged in the two sealing grooves 213 in a one-to-one correspondence, and the separation reliability between the first chamber and the second chamber is ensured by setting two sealing rings 214. It can be understood that in other embodiments, the number of sealing rings 214 can also be specifically set according to needs, for example, three sealing rings 214 are set.

[0056] Please refer to Figure 1 and Figure 2 The pressure pump sealing structure 300 provided in this embodiment is described below by taking the first sealing structure 310 as an example:

[0057] Figure 4 This is a schematic cross-sectional structure diagram of the sealing portion 340 in the pressure pump head 10 provided in this embodiment, Figure 5 This is a schematic diagram of the structure of the first sealing structure 310 in the pressure pump head 10 provided in this embodiment. Figure 2-Figure 5 In this embodiment, the first sealing structure 310 includes a connecting portion 330 and a sealing portion 340. The connecting portion 330 is fixedly connected to the cylinder head 100 to achieve the fixation of the first sealing structure 310 and the cylinder head 100. The sealing portion 340 is connected to the connecting portion 330, and the sealing between the cylinder head 100 and the outside and the sealing between the piston rod 211 and the outside are achieved through the sealing portion 340, thereby closing the first opening 113. Specifically, the sealing portion 340 is made of rubber material, and when sealing, the sealing effect is achieved through the elastic deformation of the sealing portion 340.

[0058] The sealing part 340 includes a body 346 and a connecting protrusion 341, and the body 346 and the connecting protrusion 341 are integrally formed. The connecting protrusion 341 is connected to the connecting part 330 to achieve the connection between the sealing part 340 and the connecting part 330. The body 346 has a through hole 347 for the piston rod 211 to pass through, and the through hole 347 is sealed with the piston rod 211, so as to achieve the sealing between the piston rod 211 and the outside; the sealing part 340 extends into the piston cavity 111, and the outer wall of the sealing part 340 is sealed with the cylinder head 100, so as to achieve the sealing of the cylinder head 100 at the outside. The integrally formed sealing part 340 is sealed with the cylinder head 100 and the piston rod 211 at the same time, so as to achieve the closure of the first opening 113, thereby effectively preventing the leakage of the fluid in the piston cavity 111.

[0059] It should be noted that, in the present embodiment, the connection between the sealing part 340 and the connecting part 330 is achieved by connecting the protrusion 341 with the connecting part 330. It can be understood that in other embodiments, the connection method between the sealing part 340 and the connecting part 330 can also be set according to needs, for example, the sealing part 340 is made by mold encapsulation on the connecting part 330, or the connecting part 330 and the sealing part 340 are integrally formed.

[0060] Specifically, the main body 346 is in the shape of an annular sheet, and its inner wall 349 forms a through hole 347 for the piston rod 211 to pass through. The sealing cooperation between the inner wall 349 and the piston rod 211 realizes the sealing between the piston rod 211 and the outside; the outer wall 348 of the main body 346 and the wall surface 112 of the cylinder head 100 realize the sealing between the cylinder head 100 and the outside.

[0061] Furthermore, the sealing portion 340 further includes a first sealing protrusion 350 disposed on the inner wall 349 of the body 346. The first sealing protrusion 350 is an annular protrusion formed by the inner wall 349 protruding inwardly along the radial direction of the body 346. The first sealing protrusion 350 is in sliding sealing contact with the piston rod 211 to achieve sealing between the piston rod 211 and the outside. Further, the sealing portion 340 further includes a second sealing protrusion 351 disposed on the outer peripheral wall 348 of the body 346. The second sealing protrusion 351 is an annular protrusion formed by the outer peripheral wall 348 protruding outwardly along the radial direction of the body 346. The second sealing protrusion 351 is in sealing contact with the wall surface 112 of the cylinder head 100 to achieve sealing between the cylinder head 100 and the outside.

[0062] It should be noted that the specific structure of the sealing portion 340 is not limited here. It is understandable that in other embodiments, only the first sealing protrusion 350 or only the second sealing protrusion 351 can be provided according to needs.

[0063] Furthermore, the first sealing protrusion 350 has a first mating surface 353 for sealingly contacting the piston rod 211. The first mating surface 353 is an arc surface, so that the first sealing protrusion 350 can be elastically deformed to fit closely with the piston rod 211 to ensure the reliability of the seal. Specifically, both ends of the first mating surface 353 are connected to the inner wall 349 to form a Figure 4 The cross section shown is a semicircular first sealing protrusion 350. Further, the second sealing protrusion 351 has a second mating surface 354 for sealingly contacting the wall surface 112 of the cylinder head 100. The second mating surface 354 is an arc surface, so that the second sealing protrusion 351 can be elastically deformed to fit closely with the wall surface 112 to ensure the reliability of the seal. Specifically, both ends of the second mating surface 354 are connected to the outer peripheral wall 348 to form a Figure 4 The cross section shown is a semicircular second sealing protrusion 351 .

[0064] Further, the number of the first sealing protrusions 350 is multiple, and the multiple first sealing protrusions 350 are sequentially spaced on the inner wall 349 along the axial direction of the through hole 347. Multiple sealing functions are achieved by multiple first sealing protrusions 350 to ensure the sealing reliability of the piston rod 211 outside. It should be noted that in the description of this embodiment, "multiple" refers to at least two. Specifically, the number of the first sealing protrusions 350 is two, and the two first sealing protrusions 350 are spaced on the inner wall 349, so that a deformation space for the first sealing protrusions 350 to deform is formed between the two first sealing protrusions 350. When the first sealing protrusions 350 are pressed against the piston rod 211, the first sealing protrusions 350 deform into the deformation space, which helps to ensure the sealing effect of the two first sealing protrusions 350. It can be understood that in other embodiments, the number of the first sealing protrusions 350 can also be specifically set according to needs, for example, the number of the first sealing protrusions 350 is set to three.

[0065] Further, the number of the second sealing protrusions 351 is multiple, and the multiple second sealing protrusions 351 are sequentially spaced apart on the peripheral wall 348 along the axial direction of the peripheral wall 348. Multiple sealing functions are achieved by the multiple second sealing protrusions 351 to ensure the sealing reliability between the cylinder head 100 and the outside. Specifically, the number of the second sealing protrusions 351 is two, and the two second sealing protrusions 351 are spaced apart on the peripheral wall 348, so that a space for the second sealing protrusions 351 to deform is formed between the two second sealing protrusions 351. When the second sealing protrusions 351 are pressed against the wall surface 112 of the cylinder head 100, the second sealing protrusions 351 deform into the deformation space, which helps to ensure the sealing effect of the two second sealing protrusions 351. It can be understood that in other embodiments, the number of the second sealing protrusions 351 can also be specifically set according to needs, for example, the number of the second sealing protrusions 351 is set to three.

[0066] Figure 6 This is a schematic diagram of the structure of the connecting portion 330 in the pressure pump head 10 provided in this embodiment. Figure 2-Figure 6 In this embodiment, the connecting protrusion 341 is convexly disposed on the end face of the body 346, which is the second end face 352. The connecting portion 330 is provided with a snap-fit ​​groove 334 corresponding to the connecting protrusion 341, and the connecting protrusion 341 is snap-fitted with the snap-fit ​​groove 334 to fix the sealing portion 340 to the connecting portion 330.

[0067] Figure 7 for Figure 3 The enlarged schematic diagram of the local structure at Ⅶ in the middle. Please refer to Figure 7In this embodiment, the connecting protrusion 341 includes a first protrusion 342 and a second protrusion 343. One end of the first protrusion 342 away from the second protrusion 343 is fixedly connected to the second end surface 352 of the body 346. The second protrusion 343 is arranged to protrude from the first protrusion 342 along the circumference of the body 346. Further, the connecting protrusion 341 also includes a third protrusion 344 connected to the first protrusion 342. The third protrusion 344 is arranged to protrude from the first protrusion 342 along the circumference of the body 346. At the same time, the third protrusion 344 and the second protrusion 343 are arranged on both sides of the first protrusion 342, thereby forming a "T"-shaped connecting protrusion 341. The structure of the clamping groove 334 is arranged to be "T"-shaped corresponding to the connecting protrusion 341. The first protrusion 342, the second protrusion 343 and the third protrusion 344 are all engaged with the clamping groove 334. By setting the connection protrusion 341 into a T shape and engaging with the engaging groove 334, the axial and circumferential positioning of the sealing portion 340 is achieved, and the connection reliability is high. Optionally, the first protrusion 342, the second protrusion 343 and the third protrusion 344 are integrally formed.

[0068] It should be noted that the shape structure of the connecting protrusion 341 is not limited here. It can be understood that in other embodiments, the specific structure of the connecting protrusion 341 can also be set according to needs. For example, the connecting protrusion 341 is set to be a trapezoidal shape with a gradually increasing size of the connecting protrusion 341 in the circumferential direction of the main body 346 along the direction away from the second end face 352 of the main body 346, or the connecting protrusion 341 is set to be an L-shape formed by only the first protrusion portion 342 and the second protrusion portion 343.

[0069] Furthermore, a curved surface is provided on the side of the second protrusion 343 away from the first protrusion 342, and a curved surface is provided on the side of the third protrusion 344 away from the first protrusion 342. By providing curved surfaces on the sides of the second protrusion 343 and the third protrusion 344 away from the first protrusion 342, the engagement of the connecting protrusion 341 with the engaging groove 334 is made simpler and more convenient. Specifically, the second protrusion 343 is as follows: Figure 7 The semi-cylindrical protrusion shown in FIG. 1 is a semi-cylindrical protrusion, and both ends of the arc surface on the second protrusion 343 are connected to the first protrusion 342; the third protrusion 344 is as shown in FIG. Figure 7 As shown in the semi-cylindrical protrusion, both ends of the arc surface on the third protrusion 344 are connected to the first protrusion 342 .

[0070] Further, the number of the connecting protrusions 341 is multiple, and the multiple connecting protrusions 341 are arranged at intervals along the circumference of the body 346. Optionally, in this embodiment, the number of the connecting protrusions 341 is four, and the four connecting protrusions 341 are arranged at intervals along the circumference of the body 346, and the number of the clamping grooves 334 is correspondingly set to four, and the four connecting protrusions 341 are clamped in the four clamping grooves 334 one by one, thereby ensuring the clamping reliability of the sealing part 340 and the connecting part 330. Optionally, the four connecting protrusions 341 are evenly spaced along the circumference of the body 346. It can be understood that in other embodiments, the number of the connecting protrusions 341 can also be specifically set according to needs, for example, the number of the connecting protrusions 341 is set to three or five, and accordingly, the number of the clamping grooves 334 is also set to three or five.

[0071] Further, the connecting portion 330 includes a first connecting section 331 and a second connecting section 332 connected to each other, the second connecting section 332 is used to be fixedly connected to the cylinder head 100, the first connecting section 331 has a first end face 339 located at one end away from the second connecting section 332, the clamping groove 334 is provided on the peripheral wall of the first connecting section 331, the peripheral wall is the second peripheral wall, and the clamping groove 334 is arranged through the first end face 339. During installation, the second connecting section 332 is located outside the piston cavity 111, and the second connecting section 332 is fixedly connected to the cylinder head 100; the first connecting section 331 extends from the first opening 113 into the piston cavity 111, the clamping groove 334 on the first connecting section 331 is clamped with the connecting protrusion 341, and the shape of the clamping groove 334 matches the connecting protrusion 341. Optionally, the first connecting section 331 and the second connecting section 332 are integrally formed, thereby reducing the difficulty of installation and the risk of leakage.

[0072] Furthermore, the first protrusion 342 extends along the axial direction of the body 346, the outer surface of the first protrusion 342 and the outer peripheral wall 348 of the body 346 are located on the same cylindrical surface, the radial dimension of the second peripheral wall of the first connecting section 331 is set corresponding to the dimension of the outer peripheral wall 348 of the body 346, and when the connecting protrusion 341 is engaged with the clamping groove 334 on the first connecting section 331, the outer surface of the first protrusion 342, the outer peripheral wall 348 of the body 346 and the second peripheral wall of the first connecting section 331 are spliced ​​to form a complete cylindrical surface. Furthermore, when the connecting protrusion 341 is engaged with the clamping groove 334, the second end surface 352 of the body 346 is in contact with the first end surface 339 of the first connecting section 331, so as to ensure the connection reliability of the sealing portion 340 and reduce the risk of leakage.

[0073] Please refer to Figure 2 and Figure 6In this embodiment, the second connecting section 332 includes a flange structure formed by radially protruding along the first connecting section 331, on which a second assembly hole 335 is formed, and the cylinder head 100 is provided with a first assembly hole 115 corresponding to the second assembly hole 335. The pressure pump head 10 also includes a fixing member 400, which cooperates with the first assembly hole 115 and the second assembly hole 335 at the same time, so as to fix the connecting portion 330 to the cylinder head 100. Specifically, the second connecting section 332 has a fitting surface at one end close to the first connecting section 331. During installation, the first assembly hole 115 and the second assembly hole 335 are opposite, and the fixing member 400 passes through the second assembly hole 335 and enters the first assembly hole 115 to cooperate with the first assembly hole 115. At this time, the fitting surface of the second connecting section 332 is in close contact with the cylinder head 100. Optionally, the fixing member 400 is a bolt, the first assembly hole 115 is a threaded hole, and the fixing member 400 passes through the second assembly hole 335 and is threadedly connected to the first assembly hole 115 to fix the connecting portion 330 to the cylinder head 100 .

[0074] It should be noted that the connection method between the connecting portion 330 and the cylinder head 100 is not limited here. It can be understood that in other embodiments, other methods can be used to fix the connecting portion 330 and the cylinder head 100 according to needs, such as gluing, snap-on connection, etc.

[0075] Further, the number of the first assembly holes 115 and the second assembly holes 335 is multiple, the multiple first assembly holes 115 are evenly arranged along the circumference of the first opening 113, the multiple second assembly holes 335 are evenly arranged along the circumference of the second connecting section 332, and the multiple first assembly holes 115 and the multiple second assembly holes 335 correspond one to one. Optionally, the number of the first assembly holes 115 is four, and the number of the second assembly holes 335 is correspondingly set to four. It can be understood that in other embodiments, the number of the first assembly holes 115 and the second assembly holes 335 can also be set according to needs, for example, the number of the first assembly holes 115 and the second assembly holes 335 is set to six, etc.

[0076] Figure 8 This is a partial structural diagram of the cylinder head 100 in the pressure pump head 10 provided in this embodiment, please refer to Figure 6 and Figure 8In this embodiment, the connecting portion 330 further includes an intermediate section 333 disposed between the first connecting section 331 and the second connecting section 332. The peripheral wall of the intermediate section 333 cooperates with the wall surface 112 of the cylinder head 100, and the peripheral wall is the first peripheral wall. A groove 337 is provided on the first peripheral wall, and a protrusion 116 is provided on the wall surface 112 of the cylinder head 100 corresponding to the groove 337. The protrusion 116 is engaged with the groove 337, thereby assisting in limiting the connecting portion 330, reducing the difficulty of assembly and improving the assembly efficiency. Furthermore, the first connecting section 331, the intermediate section 333 and the second connecting section 332 are integrally formed, and the connecting portion 330 also has a through hole 336 for the piston rod 211 to pass through. The through hole 336 is sequentially arranged through the second connecting section 332, the intermediate section 333 and the first connecting section 331.

[0077] Furthermore, a guide slope 117 is provided on one side of the protrusion 116 close to the first opening 113. Along the direction from the first opening 113 to the inside of the piston chamber 111, the distance between the guide slope 117 and the axis of the piston chamber 111 gradually decreases. By providing the guide slope 117 to guide the installation, the protrusion 116 can enter the groove 337 more smoothly, and the installation is convenient.

[0078] Furthermore, the groove 337 is an annular groove formed by the radial inward depression of the first circumferential wall along the middle section 333. There are multiple protrusions 116, which are arranged at intervals along the circumference of the wall surface 112. When the connecting portion 330 is connected to the cylinder head 100, the middle section 333 and the first connecting section 331 both extend into the piston cavity 111, and the multiple protrusions 116 are all clamped in the groove 337. Specifically, there are two protrusions 116, which are evenly spaced on the wall surface 112. By arranging two spaced protrusions 116 on the wall surface 112, and realizing the limiting of the connecting portion 330 by clamping the protrusions 116 with the groove 337, not only the limiting effect of the connecting portion 330 is ensured, but also the difficulty of clamping the protrusions 116 with the groove 337 is reduced, thereby reducing the difficulty of installation and helping to improve assembly efficiency.

[0079] It should be noted that the number of the bumps 116 is not limited here. It is understandable that in other embodiments, the number of the bumps 116 can be specifically set according to requirements, for example, the number of the bumps 116 can be set to three.

[0080] Fig. 9 for Figure 1 The enlarged view of the local structure at Ⅸ in the middle. Please refer to Fig. 9In this embodiment, the structure of the second sealing structure 320 is substantially the same as that of the first sealing structure 310, except that the connecting portion 330 of the second sealing structure 320 further includes a matching portion 338 integrally formed at one end of the second connecting section 332 away from the middle section 333. The matching portion 338 is cylindrical, and a sliding hole 3381 is provided in the matching portion 338, and the sliding hole 3381 is connected to the through hole 336 of the second sealing structure 320. The free end 215 of the piston rod 211 passes through the through hole 336 of the second sealing structure 320 and extends into the sliding hole 3381, and slides with the sliding hole 3381. In the process of the piston rod 211 sliding relative to the cylinder head 100, the free end 215 of the piston rod 211 always cooperates with the sliding hole 3381, so that the piston rod 211 is limited by the sliding hole 3381, so that the sliding of the piston rod 211 is more reliable.

[0081] According to a pressure pump head 10 provided in this embodiment, the working principle of the pressure pump head 10 is as follows:

[0082] During installation, the piston structure 200 is first assembled, and then the piston structure 200 is inserted into the piston cavity 111 from the first opening 113 or the second opening 114, and then the first sealing structure 310 is sleeved on the driving end 216 of the piston rod 211, and the first sealing structure 310 is fixed to the first opening 113 of the cylinder head 100 through the fixing member 400, so that the first opening 113 of the cylinder head 100 is closed by the first sealing structure 310 to prevent fluid from leaking from the first opening 113; and the second sealing structure 320 is sleeved on the free end 215 of the piston rod 211, and the second sealing structure 320 is fixed to the second opening 114 of the cylinder head 100 through the fixing member 400, so that the second opening 114 of the cylinder head 100 is closed by the second sealing structure 320 to prevent fluid from leaking from the second opening 114.

[0083] The pressure pump sealing structure 300 provided in this embodiment has at least the following advantages:

[0084] The embodiment of the present invention provides a pressure pump sealing structure 300, through which the sealing between the cylinder head 100 and the piston rod 211 in the pressure pump is achieved. The pressure pump sealing structure 300 includes an integrally formed sealing portion 340 and an integrally formed connecting portion 330. The sealing portion 340 is used to achieve sealing between the cylinder head 100 and the outside and the piston rod 211 at the outside, and the structure is simple and the sealing effect is good. The sealing portion 340 and the connecting portion 330 are fixed by snapping, and the structural design of the connecting protrusion 341 of the sealing portion 340 reduces the difficulty of assembly and improves the efficiency of assembly while ensuring the reliability of the connection between the sealing portion 340 and the connecting portion 330.

[0085] This embodiment also provides a pressure pump head 10, which includes the pressure pump sealing structure 300. Since the pressure pump head 10 includes the pressure pump sealing structure 300, it also has the beneficial effects of simple structure, good sealing effect, low assembly difficulty and high assembly efficiency.

[0086] This embodiment also provides a pressure pump, which includes the pressure pump head 10. Since the pressure pump includes the pressure pump head 10, it also has the beneficial effects of simple structure, good sealing effect, low assembly difficulty and high assembly efficiency.

[0087] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pressure pump sealing structure, used for a pressure pump, the pressure pump comprising a piston rod and a cylinder head, the cylinder head having a piston cavity slidably matched with the piston rod, characterized in that: The pressure pump sealing structure comprises a connecting portion and a sealing portion which are connected to each other, wherein the connecting portion is used for fixed connection with the cylinder head; the sealing portion has a through hole for the piston rod to pass through, and the through hole is used for sealing cooperation with the piston rod; the sealing portion is used for extending into the piston cavity, and the outer wall of the sealing portion is used for sealing cooperation with the cylinder head; The sealing part comprises an annular body and a connecting protrusion convexly arranged on the end surface of the body; the connecting part is provided with a clamping groove corresponding to the connecting protrusion, and the connecting protrusion is engaged with the clamping groove to fix the sealing part to the connecting part; The main body and the connecting protrusion are integrally formed.

2. The pressure pump sealing structure according to claim 1, characterized in that: The sealing portion comprises a body, and the through hole is arranged on the body; The body has an inner wall corresponding to the through hole, the sealing portion further comprises a first sealing protrusion arranged on the inner wall, the first sealing protrusion is annular, and the first sealing protrusion is used for sliding sealing with the piston rod; and / or, The sealing portion further comprises a second sealing protrusion arranged on the outer peripheral wall of the body, the second sealing protrusion is annular, and the second sealing protrusion is used for sealingly cooperating with the wall surface of the cylinder head.

3. The pressure pump sealing structure according to claim 2, characterized in that: There are multiple first sealing protrusions, and the multiple first sealing protrusions are sequentially spaced apart along the axial direction of the through hole; And / or, there are multiple second sealing protrusions, and the multiple second sealing protrusions are arranged in sequence and spaced apart along the axial direction of the outer peripheral wall.

4. The pressure pump sealing structure according to claim 1, characterized in that: The connecting protrusion includes a first protrusion and a second protrusion. One end of the first protrusion away from the second protrusion is fixedly connected to the body. The second protrusion protrudes out of the first protrusion along the circumference of the body. The first protrusion and the second protrusion are both engaged with the snap-in groove.

5. The pressure pump sealing structure according to claim 4, characterized in that: The connecting protrusion further includes a third protrusion portion, the third protrusion portion is fixedly connected to the first protrusion portion, and the third protrusion portion and the second protrusion portion are arranged on both sides of the first protrusion portion opposite to each other; The first protrusion, the second protrusion and the third protrusion are all engaged with the engaging groove.

6. The pressure pump sealing structure according to claim 4, characterized in that: The first protrusion extends along the axial direction of the body.

7. The pressure pump sealing structure according to claim 1, characterized in that: The connecting portion comprises a first connecting section and a second connecting section which are connected to each other; the second connecting section is used for fixed connection with the cylinder head; the first connecting section comprises a first end face which is located away from one end of the second connecting section, and the clamping groove is provided on the peripheral wall of the first connecting section and is arranged through the first end face.

8. The pressure pump sealing structure according to claim 7, characterized in that: When the connecting protrusion is engaged with the engaging groove, the end surface is in contact with the first end surface.

9. The pressure pump sealing structure according to claim 7, characterized in that: The first connecting section and the second connecting section are integrally formed.

10. The pressure pump sealing structure according to claim 1, characterized in that: There are multiple connecting protrusions, which are arranged at intervals along the circumference of the body; there are multiple snap-in grooves, which snap-in with the connecting protrusions in a one-to-one correspondence.

11. A pressure pump head, characterized in that: The pressure pump head includes a cylinder head, a piston rod and a pressure pump sealing structure as described in any one of claims 1 to 10; the cylinder head has a piston cavity, the piston cavity has an opening for the piston rod to enter the piston cavity, and the pressure pump sealing structure is arranged at the opening to close the opening.

12. The pressure pump head according to claim 11, characterized in that: The cylinder head has a wall surface corresponding to the piston cavity, and a convex block is arranged on the wall surface; the connecting part has a first peripheral wall matched with the wall surface, and a groove is arranged on the first peripheral wall, and the convex block is engaged with the groove.

13. The pressure pump head according to claim 12, characterized in that: There are multiple protrusions, which are spaced apart along the circumference of the wall surface, and all of the protrusions are snap-fitted with the groove; the groove is an annular groove.

14. The pressure pump head according to claim 11, characterized in that: It also includes a fixing piece, the cylinder head is provided with a first assembly hole, the connecting part is provided with a second assembly hole, and the fixing piece cooperates with the first assembly hole and the second assembly hole at the same time to fix the connecting part to the cylinder head.

15. A pressure pump, characterized in that: The pressure pump comprises a pressure pump head as described in any one of claims 11-14.

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