A reciprocating pump with uniformly distributed main packing radial force sealing function

Abstract

The present invention relates to the technical field of the design of a packing seal structure of a reciprocating pump, and specifically discloses a reciprocating pump with a uniformly distributed main packing radial force sealing function, comprising: a main packing box body, an auxiliary packing box body and a plunger, wherein the main packing box body is respectively provided with a gasket, a rear guide sleeve, a second step pressure ring, a third-level packing, a first step pressure ring, a second-level packing, a spacer, a first-level packing, a spacer and a second pressure ring, wherein the main packing box body is provided with a main packing adjustment nut, wherein the auxiliary packing box body is respectively provided with a first pressure ring, a second-level packing, a spacer and a front guide sleeve, wherein one side of the front guide sleeve is provided with an auxiliary packing adjustment nut, and an O-ring is provided between the main packing box body and the auxiliary packing box body, wherein the packing sealing structure can make the radial pressure distribution of the main packing uniform, thereby reducing the wear of the packing on the shaft and prolonging the working life of the packing, thereby improving the overall sealing effect.

Description

Technical Field

[0001] The invention relates to the technical field of reciprocating pump packing sealing structure design, in particular to a reciprocating pump with a uniformly distributed main packing radial force sealing function. Background Art

[0002] The function of the stuffing box seal assembly of a reciprocating pump is to provide a seal around the plunger, thereby minimizing pump leakage. The plunger is one of the important vulnerable parts in a reciprocating pump, which directly affects the performance of the pump. Poor plunger sealing will bring great difficulties to maintenance work.

[0003] The packing seal is sealed by compressing the packing to make it in close contact with the surface of the plunger and the inner surface of the sealing box. Its leakage and friction are closely related to the pressing force. Since the packing is an elastic-plastic body, when the packing is subjected to axial pressing force, the packing is compressed and moves inward. Under the action of the pressing force, the packing and the surface of the plunger and the sealing box generate contact stress, which gradually decreases from the packing installation entrance to the inside. The contact stress at the entrance is the largest, and the wear is the fastest here. Packing failure often starts from here.

[0004] In the traditional packing seal structure, the force from the packing adjusting nut is rarely transmitted to the packing at the innermost end. Most of the force is absorbed by the packing at the outer end, causing serious wear of the packing at the outer end, while the packing at the inner end is even in a brand new state. This situation is not conducive to the rational use of the packing. The ideal situation is: the force for adjusting the packing is distributed as evenly as possible along the length of the stuffing box, reducing some inherent problems in the traditional packing seal structure and alleviating these shortcomings. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a reciprocating pump with a uniformly distributed main filler radial force sealing function to overcome the defects in the prior art.

[0006] In order to solve the technical problem, the present invention provides a reciprocating pump with a uniformly distributed main stuffing radial force sealing function, comprising a main stuffing box body, an auxiliary stuffing box body and a plunger, wherein the main stuffing box body is respectively provided with a gasket, a rear guide sleeve, a second step pressure ring, a third-level stuffing, a first step pressure ring, a first-level stuffing, a second spacer and a second pressure ring, and the main stuffing box body is provided with a main stuffing adjusting nut;

[0007] The auxiliary stuffing box body is respectively provided with a first pressure ring, a secondary stuffing, a first spacer ring and a front guide sleeve, and one side of the front guide sleeve is provided with an auxiliary stuffing adjusting nut;

[0008] An O-ring is provided between the main stuffing box body and the auxiliary stuffing box body;

[0009] The primary filler is located between the second pressure ring and the second spacer, and the secondary filler is located between the front guide sleeve and the first pressure ring;

[0010] The three-stage filler is located between the second stepped pressure ring and the rear guide sleeve;

[0011] The outer diameter of the first step pressure ring is greater than the outer diameter of the second step pressure ring, and the axis of the first step pressure ring coincides with the axis of the second step pressure ring.

[0012] Furthermore, the auxiliary packing adjusting nut and the front guide sleeve are coaxially arranged.

[0013] Furthermore, the axis of the first spacer ring and the axis of the first pressure ring are located on the same straight line.

[0014] Furthermore, the front guide sleeve and the rear guide sleeve are respectively coaxially arranged with the plunger.

[0015] Furthermore, the outer diameter of the first pressure ring is smaller than the outer diameter of the second pressure ring, and the axis of the first pressure ring and the axis of the second pressure ring are located on the same straight line.

[0016] Furthermore, the first spacer is located between the secondary fillers, and a plurality of the secondary fillers are provided. The first spacer is coaxially arranged with the plunger, and a plurality of the first spacer is provided.

[0017] Furthermore, the outer diameter of the second pressure ring is greater than the outer diameter of the rear guide sleeve, and the axis of the second pressure ring coincides with the axis of the rear guide sleeve.

[0018] Beneficial Effects

[0019] 1. The present invention provides a reciprocating pump with a uniformly distributed main packing radial force sealing function, wherein a first-level packing is installed between a second pressure ring and a first step pressure ring; a second-level packing is installed between the first step pressure ring and the second step pressure ring in a main packing box body; a second-level packing is installed between a front guide sleeve and the first pressure ring in a secondary packing box body, and a third-level packing is installed between the second step pressure ring and the rear guide sleeve. Compared with a traditional packing sealing structure, the design of the packing sealing structure requires less pressure on the adjusting nut, which can reduce the wear of the packing on the shaft and extend the working life of the packing, thereby improving the overall sealing effect and helping to reduce the driving load of the shaft.

[0020] 2. The present invention provides a reciprocating pump with a uniformly distributed main packing radial force sealing function. The designed uniformly distributed main packing sealing structure is composed of three sections of packings with different cross-sections. The pressure ring between the two groups of packings with different cross-sections is designed to be stepped, and the sizes of the two side surfaces in contact with the packings with different cross-sections are kept consistent with the size of the packing. The axial force is transmitted through this structure. The axial force of the main packing adjusting nut in the middle of the packing acts on the side of the primary packing, decays after the friction resistance of the three packings, and then acts on the side of the secondary packing. Since the radial stress of the packing on the plunger is exponentially distributed along the length direction of the packing, the decayed axial force is matched with the corresponding packing cross-section, which can keep the pressure on the shaft per unit area unchanged, thereby making the stress distribution of the entire main packing in the radial direction uniform.

[0021] 3. The present invention provides a reciprocating pump with a uniformly distributed main stuffing radial force sealing function. The designed stuffing mechanism is provided with an O-ring between the main stuffing box body and the auxiliary stuffing box body. The installation of the O-ring is relatively simple, and it can effectively prevent fluid leakage. It can provide a good sealing effect in normal use, and can adapt to various working environments such as high temperature, high pressure and corrosive fluid, and has a wide range of applications.

[0022] 4. The present invention provides a reciprocating pump with a uniformly distributed main packing radial force sealing function. The designed packing mechanism uses a wider stepped pressure ring to replace a narrow spacer ring between each group of packings with different cross-sections, so that the packings with different cross-sections can be compressed more evenly. At the same time, an oil storage groove with a depth of 0.5 mm is opened in the middle of the inner hole of the pressure ring, which can be used to store liquid and also play a role in lubricating the plunger. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the packing seal structure before improvement;

[0024] Figure 2 A distribution diagram of a radial pressure curve of a filler of a reciprocating pump having a uniformly distributed main filler radial force sealing function according to the present invention;

[0025] Figure 3 It is a cross-sectional view of a packing seal structure of a reciprocating pump having a uniformly distributed main packing radial force sealing function according to the present invention;

[0026] Figure 4 For the present invention Figure 3 A magnified schematic diagram of center A.

[0027] The names of the components corresponding to the various figure marks in the figure are: 1. plunger; 2. auxiliary packing adjusting nut; 3. main packing adjusting nut; 4. front guide sleeve; 5. auxiliary packing box body; 6. first spacer; 7. secondary packing; 8. first pressure ring; 9. O-ring; 10. second pressure ring; 11. primary packing; 12. second spacer; 13. first step pressure ring; 14. second step pressure ring; 15. tertiary packing; 16. rear guide sleeve; 17. gasket; 18. main packing box body. DETAILED DESCRIPTION

[0028] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0030] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0031] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0032] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0033] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0034] See also Figures 1 to 4 The present invention provides a reciprocating pump with a uniformly distributed main stuffing radial force sealing function, comprising a main stuffing box body 18, an auxiliary stuffing box body 5 and a plunger 1, wherein a gasket 17, a rear guide sleeve 16, a second step pressure ring 14, a third-level stuffing 15, a first step pressure ring 13, a first-level stuffing 11, a second spacer 12 and a second pressure ring 10 are respectively arranged in the main stuffing box body 18, and a main stuffing adjusting nut 3 is arranged on the main stuffing box body 18;

[0035] A first pressure ring 8, a secondary packing 7, a first spacer 6 and a front guide sleeve 4 are respectively arranged in the auxiliary packing box body 5, and an auxiliary packing adjusting nut 2 is arranged on one side of the front guide sleeve 4;

[0036] An O-ring 9 is provided between the main stuffing box body 18 and the auxiliary stuffing box body 5;

[0037] The primary filler 11 is located between the second pressure ring 10 and the second spacer 12, and the secondary filler 7 is located between the front guide sleeve 4 and the first pressure ring 8;

[0038] The third-level filler 15 is located between the second step pressure ring 14 and the rear guide sleeve 16;

[0039] The outer diameter of the first step pressure ring 13 is greater than the outer diameter of the second step pressure ring 14 , and the axis of the first step pressure ring 13 coincides with the axis of the second step pressure ring 14 .

[0040] See also Figures 1 to 4 The auxiliary packing adjusting nut 2 is coaxially arranged with the front guide sleeve 4, the axis of the first spacer ring 6 is on the same straight line as the axis of the first pressure ring 8, the front guide sleeve 4 and the rear guide sleeve 16 are coaxially arranged with the plunger 1 respectively, the outer diameter of the first pressure ring 8 is smaller than the outer diameter of the second pressure ring 10, the axis of the first pressure ring 8 is on the same straight line as the axis of the second pressure ring 10, the first spacer ring 6 is located between the secondary packings 7, and multiple secondary packings 7 are arranged, the first spacer ring 6 is coaxially arranged with the plunger 1, and multiple first spacer rings 6 are arranged, the outer diameter of the second pressure ring 10 is larger than the outer diameter of the rear guide sleeve 16, and the axis of the second pressure ring 10 coincides with the axis of the rear guide sleeve 16.

[0041] The working principle and specific working process of a reciprocating pump with uniformly distributed main filler radial force sealing function are as follows:

[0042] Clean the stuffing box and plunger 1 to ensure that there is no dirt and rust. Install the components in sequence, select appropriate packing materials according to the working conditions of the reciprocating pump, install the first-level packing 11 between the second pressure ring 10 and the first step pressure ring 13, and install the second-level packing 7 in the main stuffing box body 18 between the first step pressure ring 13 and the second step pressure ring 14; install the third-level packing 15 between the second step pressure ring 14 and the rear guide sleeve 16, so that the packing is evenly installed between the main stuffing box body 18 and the auxiliary stuffing box body 5; install the second-level packing 7 into the auxiliary stuffing box body; ensure that there is no distortion, install the main packing adjusting nut 3 and the auxiliary packing adjusting nut 2, and start the reciprocating pump after completion, observe whether there is leakage, and fine-tune the main and auxiliary adjusting nuts as needed.

[0043] Since the packing is an elastic-plastic body, when the packing is subjected to axial compression, the packing is compressed and moves inward, generating friction that causes the compression force to gradually decrease along the axial direction. Due to the accumulation of axial force in a pile of packing, the outermost packing bears the highest mechanical load. The radial pressure of the sealing effect formed by the axial force makes the packing closer to the surface of the plunger 1, causing it to bear the maximum pressure drop. The innermost packing is exposed to the discharge pressure, and there is only a small pressure drop on this part of the packing.

[0044] Since the radial stress of the packing on the plunger 1 is distributed in an exponential function along the length direction of the packing, the designed packing sealing structure is composed of three sections of packings with different cross-sections. The compression ring between the two groups of packings with different cross-sections is designed to be stepped. The dimensions of the two side surfaces in contact with the packings with different cross-sections are consistent with the dimensions of the packings. A groove with a depth of 0.5 mm is opened at the inner hole of the compression ring to store liquid and lubricate the plunger 1. The axial force of the main packing adjustment nut 3 in the middle of the packing acts on the side of the primary packing 11, decays after the friction resistance of the three packings, and then acts on the side of the secondary packing 7. If the radial force generated by the secondary packing 7 is to be at least equal to the radial force of the primary packing 11, the side area of ​​the secondary packing 7 must be smaller than that of the primary packing 11. Similarly, the decayed axial force is matched with the relatively small packing cross-section, thereby keeping the pressure of the packing per unit area unchanged and making the radial stress of the entire main packing evenly distributed. This can not only reduce the wear of the packing on the shaft, but also extend the working life of the packing and improve the overall sealing effect.

[0045] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0046] The above is only a specific implementation of the present application, but the protection scope of the present application 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 in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A reciprocating pump with uniformly distributed main filler radial force sealing function, characterized in that: include: A main stuffing box body, an auxiliary stuffing box body and a plunger, wherein the main stuffing box body is respectively provided with a gasket ring, a rear guide sleeve, a second step pressure ring, a third-level stuffing, a first step pressure ring, a first-level stuffing, a second spacer and a second pressure ring, and the main stuffing box body is provided with a main stuffing adjusting nut; The auxiliary stuffing box body is respectively provided with a first pressure ring, a secondary stuffing, a first spacer ring and a front guide sleeve, and one side of the front guide sleeve is provided with an auxiliary stuffing adjusting nut; An O-ring is provided between the main stuffing box body and the auxiliary stuffing box body; The primary filler is located between the second pressure ring and the second spacer, and the secondary filler is located between the front guide sleeve and the first pressure ring; The three-stage filler is located between the second stepped pressure ring and the rear guide sleeve; The outer diameter of the first step pressure ring is greater than the outer diameter of the second step pressure ring, and the axis of the first step pressure ring coincides with the axis of the second step pressure ring; The front guide sleeve and the rear guide sleeve are respectively coaxially arranged with the plunger; The outer diameter of the first pressure ring is smaller than the outer diameter of the second pressure ring, and the axis of the first pressure ring and the axis of the second pressure ring are located on the same straight line; The first spacer is located between the secondary fillers, a plurality of the secondary fillers are provided, the first spacer is coaxially arranged with the plunger, and a plurality of the first spacer is provided; The outer diameter of the second pressure ring is greater than the outer diameter of the rear guide sleeve, and the axis of the second pressure ring coincides with the axis of the rear guide sleeve.

2. A reciprocating pump with uniformly distributed main filler radial force sealing function according to claim 1, characterized in that: The auxiliary packing adjusting nut is coaxially arranged with the front guide sleeve.

3. A reciprocating pump with uniformly distributed main filler radial force sealing function according to claim 1, characterized in that: The axis of the first spacer ring and the axis of the first pressure ring are located on the same straight line.

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