CN217976446U

CN217976446U - Plunger and plunger device

Info

Publication number: CN217976446U
Application number: CN202222090178.2U
Authority: CN
Inventors: 谯维智; 穆文堪; 万晓飞; 高翔; 陆红林; 侯成林
Original assignee: Ningbo Institute of Innovation of Beihang University
Current assignee: Ningbo Institute of Innovation of Beihang University
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2022-12-06
Anticipated expiration: 2032-08-09

Abstract

The utility model provides a plunger and a plunger device comprising the same, wherein the plunger comprises a plunger body and a plunger head with a throttling hole, the plunger body is provided with a cavity and a first end surface deviating from the plunger head, and the cavity is communicated with an opening positioned on the first end surface; the plunger further comprises a closing rod arranged in the cavity, and the closing rod is provided with a through hole through which oil supply liquid passes and is communicated with the throttling hole; the cavity is provided with a first inner wall surface deviating from the first end surface, the sealing rod is sequentially provided with a first sealing section, a rod section and a second sealing section abutted against the first inner wall surface, and the first sealing section is connected to the part, close to the first end surface, of the cavity; the first sealing section and the second sealing section are matched with the cavity and at least used for preventing oil from entering the cavity and being positioned at the outer part of the rod section.

Description

Plunger and plunger device

Technical Field

The utility model relates to a hydraulic pressure technical field especially relates to plunger and plunger device.

Background

The hydraulic pump and the hydraulic motor are respectively used as a power element and an actuating element of a hydraulic system, and play an important role in the hydraulic system. The plunger is one of essential component core parts in a hydraulic plunger motor and a hydraulic plunger pump, and is also one of main parts with complex high-pressure stress and structural stress in the hydraulic plunger motor and the hydraulic plunger pump.

In the existing structure, in order to reduce the weight of the plunger and reduce the inertia force of the plunger during movement, the plunger adopts an open hollow structure, and high-pressure oil at the bottom of the plunger can be utilized to make the plunger locally expand and deform to compensate a gap between the plunger and a plunger cavity, so that a good sealing effect is obtained.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the above technical problems, the utility model provides a plunger and plunger device.

According to one aspect of the present invention, a plunger includes a plunger body and a plunger head having a throttle hole, the plunger body having a cavity and a first end surface facing away from the plunger head, the cavity communicating with an opening at the first end surface;

the plunger further comprises a closing rod arranged in the cavity, and the closing rod is provided with a through hole through which oil supply liquid passes and is communicated with the throttling hole;

the cavity is provided with a first inner wall surface deviating from the first end surface, the sealing rod is sequentially provided with a first sealing section, a rod section and a second sealing section abutted against the first inner wall surface, and the first sealing section is connected to the part, close to the first end surface, of the cavity;

the first sealing section and the second sealing section are matched with the cavity and at least used for preventing oil from entering the cavity and being positioned at the outer part of the rod section;

the end part of the first sealing section, which deviates from the rod section, is provided with a dismounting structure, and the dismounting structure is used for being matched with a tool to assemble or dismount the closing rod.

According to at least one embodiment of the present invention, the rod section is located in the first inner wall surface in an orthographic projection of the first inner wall surface.

According to the utility model discloses an at least one embodiment, first seal segment has the second terminal surface and deviates from the third terminal surface of pole segment, the pole segment is in the orthographic projection of second terminal surface is located in the second terminal surface, first seal segment is equipped with and is used for subtracting the second annular of heavy, the notch of second annular is located on the second terminal surface, the notch is followed pole segment week side sets up.

According to at least one embodiment of the present invention, a first ring groove for embedding the first sealing ring is formed on the circumferential surface of the first sealing section,

and a third annular groove for embedding a second sealing ring is arranged on the circumferential surface of the second sealing section or a fourth end surface abutted with the first inner wall surface.

According to the utility model discloses an at least one embodiment, the cavity is close to the position of first terminal surface is equipped with the fourth annular, set up the retaining ring in the fourth annular, the retaining ring is used for the closing rod is in spacing in the cavity.

According to at least one embodiment of the present invention, an internal thread is provided at a position of the cavity close to the first end surface, the first sealing section has a screwing portion matched with the internal thread, and the screwing portion is connected in the cavity through a thread;

the first sealing section is provided with a sealing part connected with the screwing part, and the circumferential surface of the sealing part is provided with the first annular groove.

According to at least one embodiment of the present invention, a projection of the second seal segment at the second end face is located within the second end face;

the cavity body is provided with a second cavity section and a first cavity section close to the first end surface, the first sealing section is matched with the first cavity section to form sealing, the second sealing section is arranged in the second cavity section,

when the third ring groove is formed in the circumferential surface of the second sealing section, the second sealing section is matched with the second inner wall surface of the second cavity section to form sealing; or the like, or, alternatively,

when the third ring groove is formed in the fourth end face of the second sealing section, the second sealing section is matched with the first inner wall face of the second cavity section to form sealing.

According to at least one embodiment of the utility model, work as the third annular is established on the fourth terminal surface of second seal segment, the second seal segment is in orthographic projection on the first internal face with first internal face coincidence or be located in the first internal face.

According to at least one embodiment of the present invention, the through hole is coaxial with the orifice, and/or the diameter of the through hole is the same as the diameter of the orifice.

According to the utility model discloses an at least one embodiment, the cavity is followed first terminal surface to the length of first internal face is a, the length of closing rod is b, satisfies a = b + c, and wherein c is 0.1cm ~ 0.3cm.

According to at least one embodiment of the present invention, a screw thread is further provided on a hole wall of a portion of the through hole of the first sealing section, the portion being close to the third end surface, the screw thread being used for cooperating with a tool to dismount the closing rod from the plunger;

when the first sealing section is in threaded connection with the cavity, at least one groove is further formed in the third end face of the first sealing section, close to the center, and the groove is used for being matched with a tool to connect or disconnect the first sealing section with the cavity in a threaded connection mode.

Another object of the present invention is to provide a plunger device, including the above-mentioned plunger, the plunger device is a plunger pump or a plunger motor.

The beneficial effects of the utility model reside in that: compared with the prior art, fill the cavity with the closing rod that the quality is lighter, the through-hole communicates with the orifice, forms the orifice of plunger, and the during operation is full of fluid, because first seal section and second seal section all with the sealed cooperation of cavity, has avoided fluid to get into the part that the cavity is located the pole section, has reduced the useless volume of surplus of plunger at oil absorption, oil extraction in-process promptly to increase the volumetric efficiency of pump, and then reduced the pressure pulsation of pump.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic view of a plunger according to a first embodiment of the present invention.

Fig. 2 is a schematic view of a plunger according to a second embodiment of the present invention.

Fig. 3 is a schematic view of the plunger body and the plunger head of fig. 1.

Fig. 4 is a schematic view of the closure rod of fig. 1.

Fig. 5 is a schematic view of the plunger body and the plunger head of fig. 2.

Fig. 6 is a schematic view of the closure rod of fig. 2.

Reference numerals: 1-a plunger body; 2-a plunger head; 3-orifice; 4-a through hole; 5-a first end face; 6-cavity body; 7-a closing rod; 8-a first inner wall surface; 9-a first seal section; 10-pole segment; 11-a second seal section; 12-a second end face; 13-a third end face; 14-a fourth end face; 15-a screw joint; 16-a sealing portion; 17-a first sealing ring; 18-a second sealing ring; 19-a retainer ring; 20-a first ring groove; 21-a second ring groove; 22-a third ring groove; 23-a first cavity section; 24-a second cavity section; 25-a groove; 26-fourth ring groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention. It should be noted that, for convenience of description, only the parts related to the present invention are shown in the drawings.

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict. The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 or 2, the present invention provides a plunger, including a plunger body 1 and a plunger head 2 having a throttle hole 3, wherein the plunger body 1 has a cavity 6 and a first end face 5 departing from the plunger head 2, the cavity 6 is communicated with an opening located at the first end face 5; the plunger also comprises a closing rod 7 arranged in the cavity 6, and the closing rod 7 is provided with a through hole 4 for oil to pass through and communicated with the throttling hole 3; as shown in fig. 3 or 5, the cavity 6 has a first inner wall surface 8 facing away from the first end surface 5, as shown in fig. 4 or 6, the closing rod 7 has a first sealing section 9, a rod section 10 and a second sealing section 11 abutting against the first inner wall surface 8 in sequence, as shown in fig. 1 or 2, the first sealing section is connected to a portion of the cavity 6 close to the first end surface 5; the first sealing section 9 and the second sealing section 11 are matched with the cavity 6 and at least used for preventing oil from entering the cavity 6 and being positioned at the outer part of the rod section 10; the end part of the first sealing section 9, which deviates from the rod section 10, is provided with a dismounting structure, and the dismounting structure is used for being matched with a tool to assemble or dismount the closing rod 7.

The closing rod 7 can be limited in the cavity 6 by the oil pressure, as long as the area of the end of the first sealing section 9 is not smaller than that of the end of the second sealing section 11, the oil pressure acting on the first sealing section 9 and the second sealing section 11 is equal because the through hole 4 and the throttle hole 3 jointly form the throttle hole 3 of the whole plunger, and therefore the oil pressure acting on the first sealing section 9 is not smaller than that acting on the second sealing section 11. In some embodiments, the end face of the first sealing segment 9 facing the second sealing segment 11 is a second end face 12, and a projection of the second sealing segment 11 on the second end face 12 is located in the second end face 12; therefore, the oil pressure acting on the first seal section 9 is made larger than the oil pressure acting on the second seal section 11, and the end face of the second seal section 11 facing the first inner wall surface 8, that is, the following fourth end face 14, is made to abut against the first inner wall surface 8, thereby ensuring sealing.

In some embodiments, the closing rod 7 may also be limited inside the cavity 6 by welding or screwing, for example, as shown in fig. 2, 5 and 6, an internal thread is provided at a position of the cavity 6 close to the first end surface 5, the first sealing section 9 has a screwing portion 15 matched with the internal thread, the screwing portion 15 is screwed into the cavity 6, or a first half threaded hole is provided on an end surface of the first sealing section 9 away from the second sealing end, that is, a third end surface 13, and a second half threaded hole is provided on the first end surface 5, and the first half threaded hole and the second half threaded hole Kong Pinge form a complete threaded hole which is screwed with a set screw; or, an internal thread is arranged at the position of the cavity 6 close to the first inner wall surface, and the corresponding second sealing section 11 is provided with an external thread matched with the internal thread; or by other existing threaded connections.

In an alternative embodiment, the closing rod 7 is limited inside the cavity 6 by providing a limiting part, for example, a limiting pin is provided at the position of the cavity 6 close to the first end face 5, and the limiting pin extends towards the inside of the cavity 6 along the radial direction of the cavity 6, so as to limit the closing rod 7 inside the cavity 6; in some embodiments, as shown in fig. 1, 2, 3 and 5, the cavity 6 is provided with a fourth groove 26 at a position close to the first end face 5, and a retainer ring 19 is arranged in the fourth groove 26, and the retainer ring 19 is used for limiting the position of the closing rod 7 in the cavity 6. Preferably, the first seal segment 9 is threadedly connected to the housing 6, and a retainer ring 19 is provided, the retainer ring 19 serving to prevent the threaded connection between the first seal segment 9 and the housing 6 from loosening.

For the sealing between the first sealing section 9 and the cavity 6 and between the second sealing section 11 and the cavity 6, the sealing can be realized in an interference fit manner, that is, the first sealing section 9 is in interference fit with the inner wall of the cavity 6, and the second sealing section 11 is in interference fit with the inner wall of the cavity 6; or, sealing is realized by arranging rubber pieces and the like between the first sealing section 9 and the inner wall of the cavity 6 and between the second sealing section 11 and the inner wall of the cavity 6, for example, rubber sleeves can be sleeved outside the first sealing section 9 and the second sealing section 11, the first sealing section 9 and the second sealing section 11 which are sleeved with the rubber sleeves are in interference fit with the cavity 6, the rubber sleeves are extruded, and a sealing effect is achieved, so that oil is prevented from entering the cavity 6 outside the sealing rod 7; or, a sealing gasket is arranged at the end part of the second sealing section 11 to realize the sealing of the second sealing section 11; or the first sealing section 9 or the second sealing section 11 is in taper thread connection with the cavity 6, and a raw adhesive tape is wound on the taper thread to realize the sealing of the first sealing section 9 or the second sealing section 11.

In some embodiments, as shown in fig. 1, 2, 4 and 6, the first sealing section 9 is provided with a first ring groove 20 on the circumferential surface thereof for receiving the first sealing ring 17, and the second sealing section 11 is provided with a third ring groove 22 on the circumferential surface thereof or on the fourth end surface 14 abutting against the first inner wall surface 8 for receiving the second sealing ring 18. I.e. the sealing between the closing rod 7 and the inner wall of the chamber 6 is achieved by means of a first sealing ring 17 and a second sealing ring 18. The first sealing ring 17 is used for preventing oil from entering the hollow part between the cavity 6 and the rod section 10 through the opening of the first end face 5; the second seal is used to isolate the hollow section between the bore 4 and the orifice 3 from the ingress of oil into the cavity 6 and the rod section 10. It will be apparent that the first and

third ring grooves

20, 22 may also open on the inner wall of the cavity 6.

As shown in fig. 6, when the first sealing section 9 is screwed with the cavity 6, the first sealing section 9 further has a sealing portion 16 connected with the screwing portion 15, and the circumferential surface of the sealing portion 16 is provided with the first ring groove 20.

In some embodiments, as shown in fig. 1, 2, 3 and 5, the cavity 6 has a second cavity section 24 and a first cavity section 23 close to the first end face 5, the first sealing section 9 cooperates with the first cavity section 23 to form a seal, the second sealing section 11 is arranged in the second cavity section 24, and when the third ring groove 22 is arranged on the circumferential surface of the second sealing section 11, the second sealing section 11 cooperates with the second inner wall surface of the second cavity section 24 to form a seal; or, when the third ring groove 22 is disposed on the fourth end surface 14 of the second seal segment 11, the second seal segment 11 cooperates with the first inner wall surface 8 of the second cavity segment 24 to form a seal. That is, the cavity 6 is stepped, the first sealing section 9 is located at the large end of the cavity 6, and the second sealing section 11 is located at the small end of the cavity 6. Therefore, when the first sealing section 9 is in threaded connection with the cavity 6, a threaded hole is machined at the small end of the cavity 6; and the area of the second end face 12 is ensured to be larger than that of the fourth end face 14, so that the oil hydraulic pressure acting on the second end face 12 is larger than that acting on the fourth end face 14, the fourth end face 14 is tightly attached to the first inner wall surface 8, and sealing is ensured. The second inner wall surface is an inner circumferential surface of the cavity 6 close to the first inner wall surface 8.

As shown in fig. 4, when the third ring groove 22 is disposed on the fourth end surface 14 of the second sealing segment 11, the orthographic projection of the second sealing segment 11 on the first inner wall surface 8 coincides with the first inner wall surface 8 or is located in the first inner wall surface 8, so that the size of the second sealing segment 11 of the closing rod 7 can be reduced, and the weight of the closing rod 7 can be reduced.

The closing rod 7 may be made of a light material such as a light metal such as an aluminum alloy, nylon, or a plastic such as teflon, in consideration of the overall weight of the plunger. In the present embodiment, the closing rod 7 is a nylon rod or a teflon rod, so that the remaining dead volume of the plunger during oil suction and oil discharge is reduced, the weight of the plunger is reduced, and the inertial force of the plunger during movement is reduced.

In some embodiments, the orthographic projection of the pole segment 10 on the first inner wall surface 8 is located within the first inner wall surface 8, i.e. the cross section of the pole segment 10 is smaller than the cross section of the cavity 6; if the cross-sections of the rod section 10 and the cavity 6 are circular, the diameter of the rod section 10 is smaller than the diameter of the cavity 6, so that the weight of the closing rod 7 is further reduced, and the inertia force during the movement of the plunger is further reduced.

In some embodiments, as shown in fig. 4 and 6, the first sealing section 9 has a second end face 12 and a third end face 13 facing away from the rod section 10, the rod section 10 being located in the second end face 12 in an orthographic projection of the second end face 12, the first sealing section 9 being provided with a second annular groove 21 for weight reduction, the second annular groove 21 having a notch located on the second end face 12, the notch being arranged along the circumferential side of the rod section 10. Thereby further reducing the weight of the closing rod 7.

The through bore 4 may not be coaxial with the orifice bore 3 and in some embodiments, as shown in figures 1 and 2, the through bore 4 is coaxial with the orifice bore 3 to ensure that the orifice bore 3 is aligned with the through bore 4 after the closure rod 7 is installed to facilitate oil entering the orifice bore 3 through the through bore 4.

The diameter of the through hole 4 may be larger than that of the orifice 3, and the diameter of the through hole 4 may be smaller than that of the orifice 3. In some embodiments, the diameter of the through hole 4 is the same as the diameter of the throttle hole 3, reducing the residual dead volume while ensuring the throttling effect.

In some embodiments, as shown in fig. 3 or 5, the cavity 6 has a length a from the first end surface 5 to the first inner wall surface 8, and as shown in fig. 4 or 6, the closing rod 7 has a length b, satisfying a = b + c, where c is 0.1cm to 0.3cm. After the closing rod 7 is installed in the cavity 6, the third end surface 13 does not protrude out of the first end surface 5, and the normal work of the plunger is prevented from being influenced by the closing rod 7.

Fill cavity 6 of plunger body 1 through closing rod 7, let in fluid to orifice 3 through-hole 4 in closing rod 7, prevent simultaneously through first seal segment 9 and second seal segment 11 that fluid from getting into the hollow part between rod segment 10 and the cavity 6 to reduced surplus invalid volume, used second seal segment 11 as the cylinder for the example, the diameter of establishing second seal segment 11 is d, and then surplus invalid volume V that this plunger can reduce is about: v = a π d ² /4。

The disassembly structure can be a flat opening arranged at the end part of one end of the first sealing section, which is far away from the rod section. In some embodiments, as shown in fig. 4 or 6, the through hole 4 of the first sealing section 9 is further provided with a thread on a hole wall of a portion close to the third end surface 13, and the thread is used for cooperating with a tool to mount and dismount the closing rod 7 on the plunger; specifically, a screw rod or a special tool with the same specification as the thread is screwed into the thread, and the closing rod 7 is forcibly inserted into or pulled out of the cavity 6; when the first sealing section 9 is in threaded connection with the cavity 6, at least one groove 25 is further formed in the third end face 13 of the first sealing section 9, the position is close to the center, and the groove 25 is used for being matched with a tool to enable the first sealing section 9 to be in threaded connection with or separated from the cavity 6; specifically, a straight screwdriver, a torx screwdriver or an internal hexagonal wrench which is matched with the groove 25 can be inserted into the groove 25, and then the closing rod 7 is rotated, so that the closing rod 7 can be arranged in the cavity 6, or the closing rod 7 can be taken out of the cavity 6.

The utility model also provides a plunger device, this plunger device include foretell plunger, and the plunger device is plunger pump or plunger motor.

The technical effect of the plunger device is the same as that of the plunger device in the prior art, and is not described herein again.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are provided for clarity of description only, and are not intended to limit the scope of the invention. Other variations or modifications will occur to those skilled in the art based on the foregoing disclosure and are still within the scope of the invention.

Claims

1. A plunger, comprising a plunger body and a plunger head having an orifice, the plunger body having a cavity and a first end face facing away from the plunger head, the cavity communicating with an opening in the first end face;

2. The plunger of claim 1, wherein an orthographic projection of said rod segment on said first interior wall surface lies within said first interior wall surface.

3. The plunger of claim 1 wherein said first seal segment has a second end face and a third end face facing away from said rod segment, said rod segment being positioned in said second end face in orthographic projection of said second end face, said first seal segment being provided with a second annular groove for reducing weight, said second annular groove having notches positioned on said second end face, said notches being positioned circumferentially along said rod segment.

4. The plunger according to claim 3, wherein the first sealing section has a first ring groove on its circumferential surface for receiving the first sealing ring,

5. The plunger of claim 4 wherein said chamber has a fourth annular groove adjacent said first end surface, said fourth groove having a retaining ring therein for retaining said closing rod in said chamber.

6. The plunger of claim 4 wherein said cavity has internal threads adjacent said first end surface, said first seal segment having a threaded portion for engaging said internal threads, said threaded portion being threadably engaged in said cavity;

the first sealing section is further provided with a sealing part connected with the screwing part, and the circumferential surface of the sealing part is provided with the first annular groove.

7. The plunger of claim 5, wherein a projection of the second seal segment on the second end face is located within the second end face;

8. The plunger of claim 7, wherein when the third annular groove is formed in the fourth end surface of the second seal segment, an orthographic projection of the second seal segment on the first inner wall surface is coincident with or within the first inner wall surface.

9. The plunger of claim 1, wherein said through bore is coaxial with said orifice bore, and/or wherein said through bore has a diameter that is the same as the diameter of said orifice bore.

10. The plunger of claim 1, wherein the cavity has a length a from the first end face to the first interior wall surface, and the closure rod has a length b satisfying a = b + c, where c is 0.1cm to 0.3cm.

11. The plunger according to claim 3, wherein the hole wall of the part of the through hole of the first sealing section, which is close to the third end face, is further provided with threads, and the threads are used for being matched with a tool to disassemble the closing rod to the plunger;

12. A plunger device comprising a plunger according to any of claims 1-11, wherein the plunger device is a plunger pump or a plunger motor.