Plunger pump

Abstract

The utility model provides a plunger pump which comprises a plunger, a stuffing box body sleeved on the plunger and a plunger end cover sleeved on the plunger and connected with the stuffing box body, a placing groove is arranged on the inner wall of the stuffing box body, a stuffing placing area is formed between the placing groove and the outer wall of the plunger, a stuffing assembly is arranged in the stuffing placing area, and the stuffing assembly is connected with the plunger end cover. The packing assembly comprises an elastic piece, a first pressing ring, a second pressing ring and packing. The packing is located between the first pressing ring and the second pressing ring, inclined faces are arranged on the sides, close to the packing, of the first pressing ring and the second pressing ring and the two sides of the packing, the elastic piece is located in the packing containing area and used for pushing the packing assembly to the plunger end cover, and a first gap is formed between the outer side of the packing and the inner wall of the packing box body. According to the utility model, the packing can be better deformed to make up the abrasion clearance, and the sealing effect can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of pump technology, specifically to a plunger pump. Background Technology

[0002] High-pressure plunger pumps typically operate at pressures between 10 MPa and 00 MPa. They are positive displacement pumps, utilizing the periodic changes in volume within the working chamber to transport liquids. High-pressure plunger pumps require precise sealing of the plunger; inadequate sealing can easily lead to leaks.

[0003] The utility model with announcement number CN201836033U (hereinafter referred to as "Prior Art 1") discloses a stuffing box device for a high-pressure reciprocating pump, including a plunger, a stuffing box and a stuffing assembly. The stuffing box is fitted on the plunger, and the stuffing assembly is disposed in the gap between the plunger and the stuffing box. A spring is also fitted between the plunger and the stuffing box. One end of the spring abuts against the stuffing assembly and the other end abuts against a spring compression sleeve disposed at the rear end of the stuffing box.

[0004] Utility model CN217152267U (hereinafter referred to as "Prior Technology 2") discloses a sealing structure for a high-pressure plunger pump, including a plunger, a stuffing box, and a plunger end cap. The stuffing box is fitted onto the plunger, and a packing placement area is provided on the inner wall of the stuffing box. A packing assembly is filled in the packing placement area. The plunger end cap is connected to the stuffing box to fix the packing assembly in the packing placement area. The packing assembly includes a concave guide ring, a convex guide ring, an elastic element, and several V-shaped packings. The concave guide ring has a first flat portion and a first V-shaped groove on the side opposite to the first flat portion. One end of the V-shaped packing has a first V-shaped protrusion and a second V-shaped groove on the side opposite to the first V-shaped protrusion. One end of the convex guide ring has a second flat portion and a second V-shaped protrusion on the side opposite to the second flat portion. In practical use, it can achieve the purpose of stepped pressure reduction, has good stress compensation capability, and can further improve the sealing effect.

[0005] Both prior art 1 and prior art 2 disclose a sealing structure. The sealing effect is achieved by compressing the packing and causing it to deform. However, in actual use, it has been found that the packing cannot deform as expected to fill the wear gap after wear, and leakage is still likely to occur in the later stages of use. At the same time, there is also the problem of difficulty in replacing the packing in the later stages. Utility Model Content

[0006] The purpose of this invention is to provide a plunger pump that, in practical use, allows the packing to deform and slip better to compensate for wear gaps, thereby effectively improving the sealing effect.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A plunger pump includes a plunger, a stuffing box fitted on the plunger, and a plunger end cap fitted on the plunger and connected to the stuffing box. The inner wall of the stuffing box is provided with a placement groove, and the placement groove and the outer wall of the plunger form a stuffing placement area.

[0009] A packing assembly is provided in the packing placement area. The packing assembly includes an elastic element, a first pressure ring, a second pressure ring, and packing. The packing is located between the first pressure ring and the second pressure ring. Inclined surfaces are provided on the side of the first pressure ring and the second pressure ring near the packing and on both sides of the packing. The elastic element is located in the packing placement area and is used to push the packing assembly toward the plunger end cap.

[0010] Furthermore, the packing material is of several types, and the packing assembly also includes several intermediate pressure rings. The packing material and the intermediate pressure rings are arranged alternately, and a first inclined surface corresponding to the inclined surface on both sides of the packing material is provided on both sides of the intermediate pressure ring.

[0011] The packing assembly also includes a thrust ball bearing, which is located between the second pressure ring and the plunger end cap.

[0012] Further specified, the plunger end cap and the stuffing box are connected by threads.

[0013] Furthermore, a sealing ring is provided between the plunger end cap and the stuffing box.

[0014] The first pressure ring and the second pressure ring are connected as a single unit by a connecting component.

[0015] Furthermore, the connecting assembly includes a connecting screw and a nut. The first pressure ring, the second pressure ring, and the intermediate pressure ring are all provided with through holes. The connecting screw passes through the through holes and is connected to the nut.

[0016] The first and second pressure rings are provided with countersunk holes that are connected by through holes.

[0017] Further specifying, the packing material is hollow inside.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In this application, pressure is applied to the first and second pressure rings to compress the packing, enabling the packing to compensate for wear gaps under the action of the elastic element after wear. In this application, since the first and second pressure rings are provided with inclined surfaces on the side near the packing and on both sides of the packing, and since there is a first gap between the outer side of the packing and the inner wall of the stuffing box, the packing can slide towards the plunger after being compressed, and deform under pressure, so that the packing and the plunger form a tighter seal, which can effectively improve the sealing effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This utility model Figure 1 A magnified view of a portion of point A in the middle.

[0023] Figure 3 This is a schematic diagram showing the connection relationship between the connecting component and the packing component of this utility model.

[0024] Figure label:

[0025] 101 Plunger, 102 Stuffing gland, 103 Plunger end cap, 104 Placement groove, 105 Stuffing placement area, 106 Stuffing assembly, 107 Elastic element, 108 First pressure ring, 109 Second pressure ring, 110 Stuffing, 111 Inclined surface, 112 First gap, 113 Intermediate pressure ring, 114 First inclined surface, 115 Thrust ball bearing, 116 Sealing ring, 117 Connecting assembly, 118 Connecting screw, 119 Nut, 120 Countersunk hole, 121 Through hole. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0027] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0030] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0032] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0033] See Figures 1-3 This embodiment discloses a plunger pump, including a plunger 101, a stuffing box 102 fitted on the plunger 101, and a plunger end cap 103 fitted on the plunger 101 and connected to the stuffing box 102. The inner wall of the stuffing box 102 is provided with a placement groove 104, and a stuffing placement area 105 is formed between the placement groove 104 and the outer wall of the plunger 101.

[0034] A packing assembly 106 is provided in the packing placement area 105. The packing assembly 106 includes an elastic element 107, a first pressure ring 108, a second pressure ring 109, and a packing 110. The packing 110 is located between the first pressure ring 108 and the second pressure ring 109. Inclined surfaces 111 are provided on the side of the first pressure ring 108 and the second pressure ring 109 near the packing 110 and on both sides of the packing 110. The elastic element 107 is located in the packing placement area 105 and is used to push the packing assembly 106 toward the plunger end cap 103. A first gap 112 is formed between the outer side of the packing 110 and the inner wall of the stuffing box 102.

[0035] In this application, pressure is applied to the first pressure ring 108 and the second pressure ring 109 to squeeze the packing 110, so that the packing 110 can compensate for the wear gap under the action of the elastic element 107 after being worn. In this application, since the first pressure ring 108 and the second pressure ring 109 are provided with inclined surfaces 111 on the side near the packing 110 and on both sides of the packing 110, and since there is a first gap 112 between the outer side of the packing 110 and the inner wall of the stuffing box 102, the packing 110 can slide towards the plunger 101 after being squeezed, and deform after being compressed, so that the packing 110 and the plunger 101 form a tighter seal, which can effectively improve the sealing effect.

[0036] Furthermore, in some preferred embodiments, there are several packings 110, and the packing assembly 106 also includes several intermediate pressure rings 113. The several packings 110 and several intermediate pressure rings 113 are arranged alternately, and a first inclined surface 114 corresponding to the inclined surface 111 on both sides of the intermediate pressure ring 113 is provided.

[0037] The intermediate pressure ring 113 allows each packing 110 to be compressed, and under the action of the first inclined surface 114, the packing 110 is compressed, so that the packing 110 always has a sliding tendency to ensure the sealing effect of the packing 110.

[0038] Furthermore, the packing assembly 106 also includes a thrust ball bearing 115, which is located between the second pressure ring 109 and the plunger end cap 103. The thrust ball bearing 115 ensures that when the plunger end cap 103 is connected to the packing gland 102, the second pressure ring 109 bears radial force, and under the action of the thrust ball bearing 115, the second pressure ring 109 will not rotate.

[0039] The plunger end cap 103 and the stuffing box 102 are connected by threads.

[0040] Furthermore, a sealing ring 116 is provided between the plunger end cap 103 and the stuffing box 102.

[0041] In some preferred embodiments, the first pressure ring 108 and the second pressure ring 109 are connected as an integral structure by the connecting component 117.

[0042] The connecting assembly 117 includes a connecting screw 118 and a nut 119. The first pressure ring 108, the second pressure ring 109 and the intermediate pressure ring 113 are all provided with through holes 121. The connecting screw 118 passes through the through hole 121 and is connected to the nut 119.

[0043] This configuration allows the first pressure ring 108, the second pressure ring 109, the intermediate pressure ring 113, and the packing 110 to be connected together. When replacing them, the packing assembly 106 can be removed as a whole at once, facilitating the rapid replacement of the packing 110.

[0044] The first pressure ring 108 and the second pressure ring 109 are provided with countersunk holes 120 that are connected to the through holes 121. The countersunk holes 120 allow the connecting screw 118 and the nut 119 to be hidden inside the countersunk holes 120.

[0045] Furthermore, in some preferred embodiments, the packing 110 is hollow inside. This design allows the packing 110 to have better deformability and, when the packing 110 is squeezed, it can make the packing 110 and the plunger 101 more tightly contacted.

[0046] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plunger pump, comprising a plunger, a stuffing box fitted onto the plunger, and a plunger end cap fitted onto the plunger and connected to the stuffing box, wherein a placement groove is provided on the inner wall of the stuffing box, and a packing placement area is formed between the placement groove and the outer wall of the plunger, characterized in that: A packing assembly is provided in the packing placement area. The packing assembly includes an elastic element, a first pressure ring, a second pressure ring, and packing. The packing is located between the first pressure ring and the second pressure ring. Inclined surfaces are provided on the side of the first pressure ring and the second pressure ring near the packing and on both sides of the packing. The elastic element is located in the packing placement area and is used to push the packing assembly toward the plunger end cap. There is a first gap between the outer side of the packing and the inner wall of the packing gland.

2. The plunger pump according to claim 1, characterized in that: The packing consists of several packings, and the packing assembly also includes several intermediate pressure rings. The packings and intermediate pressure rings are arranged alternately, and a first inclined surface corresponding to the inclined surface on both sides of the packing is provided on both sides of the intermediate pressure ring.

3. The plunger pump according to claim 2, characterized in that: The packing assembly also includes a thrust ball bearing located between the second pressure ring and the plunger end cap.

4. The plunger pump according to claim 3, characterized in that: The plunger end cap and the stuffing box are connected by threads.

5. The plunger pump according to claim 4, characterized in that: A sealing ring is provided between the plunger end cap and the stuffing box.

6. The plunger pump according to claim 3, characterized in that: The first and second pressure rings are connected as a single unit via a connecting assembly.

7. The plunger pump according to claim 6, characterized in that: The connecting assembly includes a connecting screw and a nut. The first pressure ring, the second pressure ring, and the intermediate pressure ring are all provided with through holes. The connecting screw passes through the through holes and is connected to the nut.

8. The plunger pump according to claim 7, characterized in that: The first and second pressure rings are provided with countersunk holes that are connected by through holes.

9. The plunger pump according to any one of claims 1-8, characterized in that: The packing is hollow inside.

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