Pressing cap anti-loosening device and plunger pump

Abstract

The utility model relates to the technical field of plunger pump accessories, in particular to a pressing cap locking device and a plunger pump. The pressing cap anti-loosening device is arranged on a plunger pump fluid end suction cover assembly and / or a plunger pump fluid end discharge cover assembly and comprises a positioning plate and a limiting piece. The positioning plate is arranged along the surface of the fluid end of the plunger pump, and an assembling part is arranged on the positioning plate; and the limiting piece is fixed to the assembling part, and the outer wall of the limiting piece is provided with a limiting face used for being attached to the inner wall of the plunger pump fluid end pressing cap so as to stop rotation and limit the pressing cap. According to the pressing cap anti-loosening device and the plunger pump, the positioning plate can be installed on the plunger pump fluid end suction cover assembly and / or the plunger pump fluid end discharge cover assembly, the assembling part for fixedly installing the limiting piece is arranged on the positioning plate, and the outer side limiting face of the limiting piece is attached to the inner wall face of the pressing cap, so that the pressing cap is prevented from loosening. Therefore, rotation stopping and limiting of the pressing cap are achieved, a pressing cap anti-loosening structure is formed, and when the pump runs, the pressing cap cannot be loosened due to vibration or pressure impact.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pump accessories, in particular to a pressure cap anti-loosening device and a plunger pump. Background Art

[0002] Currently, reciprocating plunger pumps are increasingly used in the fields of oil fracturing and coal seam hydraulic fracturing. Since there are many types of reciprocating plunger pumps in various sub-sectors, fracturing pumps will be used as an example. Fracturing pumps experience significant vibration during construction, so preventing loosening of the threads of various assembly components is particularly important for fracturing pumps. The hydraulic end of the fracturing pump is a key component of the entire hydraulic system of the fracturing pump. Through the reciprocating motion of the plunger, mechanical energy is converted into hydraulic pressure energy. The suction and discharge glands of the hydraulic end are both sealed by a pressure cap, ensuring efficient and stable operation of the hydraulic end. If the pressure cap is loose, leakage from the suction and discharge glands of the hydraulic end can occur. In severe cases, the discharge gland can be dislodged by high-pressure liquid, causing a safety accident.

[0003] Currently, the hydraulic end of a fracturing pump station lacks a gland lock. The gland in the hydraulic end of the fracturing pump is threaded to the pump head, lacking a lock. During operation, plunger movement and overall pump station vibration can cause the gland to loosen, leading to leakage at the suction and discharge gland assemblies, potentially causing the entire fracturing pump to malfunction.

[0004] It can be seen that the fracturing pumps and even plunger pumps in the prior art have the following problems:

[0005] 1. At present, the hydraulic end gland and the pump head body are only connected by threads to tighten the suction gland assembly and the discharge gland assembly, and there is no anti-loosening mechanism. When the pump is running, due to vibration or pressure shock, the gland will become loose, and then the suction gland assembly and the discharge gland assembly will become loose, causing the seals of these two places to be damaged by high-pressure liquid, resulting in leakage.

[0006] 2. When there is no anti-loosening mechanism and the construction time is long, when the threaded cap loosens due to vibration or pressure shock during pump operation and the seal is not replaced and repaired in time, especially during sand-carrying operations, the erosion and wear of the suction gland, discharge gland and the cylindrical surface of the pump head body will be aggravated, forming grooves, which will eventually become irreparable and scrapped, resulting in huge economic losses. Utility Model Content

[0007] The utility model provides a pressure cap anti-loosening device and a plunger pump, which are used to solve the defects in the prior art that the hydraulic end pressure cap of the plunger pump is not provided with an anti-loosening structure, and the pressure cap is easy to loosen, leak and wear.

[0008] The utility model provides a pressure cap anti-loosening device, which is arranged on the plunger pump hydraulic end suction cover assembly and / or the plunger pump hydraulic end discharge cover assembly, and the pressure cap anti-loosening device includes:

[0009] A positioning plate is provided along the surface of the hydraulic end of the plunger pump, and an assembly portion is provided on the positioning plate;

[0010] The limiting member is fixed on the assembly portion, and the outer wall of the limiting member has a limiting surface for fitting with the inner wall of the hydraulic end pressure cap of the plunger pump to prevent the pressure cap from rotating and limiting the position.

[0011] According to the pressure cap anti-loosening device of the present invention, the limiting member includes: a hexagonal head, the outer wall surface of the hexagonal head is a hexagonal structure adapted to the inner wall surface of the pressure cap, and the hexagonal head is inserted into the pressure cap.

[0012] According to the pressure cap anti-loosening device of the present invention, the limiting member is provided with a first assembly hole, and the assembly portion includes: an arc-shaped hole and a first fastener; wherein,

[0013] By rotating the limiting member, the first assembly hole can move in the area where the arc-shaped hole is located, and the first assembly hole and the arc-shaped hole can be fastened by the first fastener.

[0014] According to the pressure cap anti-loosening device of the present invention, a plurality of first assembly holes are provided on the limiting member, and the plurality of first assembly holes are arranged along the circumferential direction of the limiting member.

[0015] According to the pressure cap anti-loosening device of the present invention, the assembly portion further comprises: a gasket, which is arranged on the contact surface between the first fastener and the arc-shaped hole.

[0016] According to the pressure cap anti-loosening device of the present invention, a plurality of second assembly holes are provided on the limiting member, and the assembly portion further comprises: a plurality of positioning holes and a plurality of second fasteners; wherein the second assembly holes and the positioning holes are fastened by the second fasteners.

[0017] According to the pressure cap anti-loosening device of the present invention, it further includes: a buckle cover, which is arranged on the positioning plate, and the first fastener cover is arranged on the inner side of the buckle cover.

[0018] According to the pressure cap anti-loosening device of the present invention, the limiting member is provided with a third assembly hole, the buckle cover is provided with a fourth assembly hole, and the assembly portion further includes: a fifth assembly hole and a third fastener; wherein,

[0019] The third fastener passes through and fastens the fourth assembly hole, the fifth assembly hole, and the third assembly hole in sequence.

[0020] According to the pressure cap anti-loosening device of the present invention, the positioning plate is provided with a plurality of assembly parts, and the limiting members are fixed on the assembly parts in a one-to-one correspondence.

[0021] The utility model also provides a plunger pump, comprising: the pressure cap anti-loosening device provided by the utility model.

[0022] The utility model provides a pressure cap anti-loosening device, which is installed on the hydraulic end suction cover assembly and / or the hydraulic end discharge cover assembly of the plunger pump to prevent the pressure cap at the hydraulic end suction cover assembly and / or the hydraulic end discharge cover assembly of the plunger pump, and comprises a positioning plate and a limiting member. The positioning plate is arranged along the surface of the hydraulic end of the plunger pump and is provided with an assembly portion; the limiting member is fixed to the assembly portion, and the outer wall of the limiting member has a limiting surface for engaging with the inner wall of the pressure cap of the hydraulic end of the plunger pump to prevent the pressure cap from rotating and limiting its position. The utility model provides a pressure cap anti-loosening device, and a positioning plate can be correspondingly installed on the suction cover assembly and / or the discharge cover assembly of the hydraulic end of the plunger pump, and an assembly portion for fixing a limiting member is provided thereon, and the outer limiting surface of the limiting member is fitted with the inner wall surface of the pressure cap, thereby realizing the anti-rotation limit of the pressure cap, forming a pressure cap anti-loosening structure, when the pump is running due to vibration or pressure shock, the pressure cap will not loosen, thereby ensuring the stable connection and sealing effect of the suction pressure cap assembly and / or the discharge pressure cap assembly, and avoiding leakage; moreover, when the construction operation time is long, since the pressure cap will not loosen, the erosion and wear of the suction pressure cap, the discharge pressure cap and the matching cylindrical surface of the pump head body are reduced, and the problem of being unable to repair or scrapped due to the above problems is reduced, thereby reducing economic losses.

[0023] Furthermore, the present invention provides a plunger pump, which includes the pressure cap anti-loosening device of the present invention, and therefore has the same advantages as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a front view of a pressure cap anti-loosening device provided in one embodiment of the present utility model.

[0026] Figure 2 It is a bottom view of the pressure cap anti-loosening device provided in one embodiment of the present utility model.

[0027] Figure 3It is a structural schematic diagram of a position limiting member provided in one embodiment of the present utility model.

[0028] Figure 4 It is a structural schematic diagram of a positioning plate provided in one embodiment of the present utility model.

[0029] Figure 5 It is a cross-sectional view of a buckle cover provided in one embodiment of the present utility model.

[0030] Figure 6 It is a structural schematic diagram of the pressure cap anti-loosening device provided in one embodiment of the present utility model being assembled to the plunger pump hydraulic end suction cover assembly and the plunger pump hydraulic end discharge cover assembly.

[0031] Reference numerals:

[0032] 1: Positioning plate; 11: Arc hole; 12: Positioning hole; 13: Fifth assembly hole; 2: Limiting member; 21: Limiting surface; 22: First assembly hole; 23: Second assembly hole; 24: Third assembly hole; 3: First fastener; 4: Gasket; 5: Buckle cover; 51: Fourth assembly hole; 6: Third fastener;

[0033] 100: Pressure cap anti-loosening device; 200: Suction cover assembly; 300: Discharge cover assembly. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment 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 should not be understood as a limitation on this embodiment.

[0036] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this embodiment, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0037] In this embodiment, unless otherwise specified or limited, the terms "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0038] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] The following combination Figures 1-6 The present invention describes a pressure cap anti-loosening device 100. The pressure cap anti-loosening device 100 is mounted on the hydraulic end suction cover assembly 200 and / or the hydraulic end discharge cover assembly 300 of the plunger pump, thereby preventing the pressure caps at the hydraulic end suction cover assembly 200 and / or the hydraulic end discharge cover assembly 300 of the plunger pump from loosening.

[0040] The pressure cap anti-loosening device 100 of the present invention comprises a positioning plate 1 and a limiting member 2 .

[0041] Among them, the positioning plate 1 is arranged along the surface of the hydraulic end of the plunger pump, and an assembly part is provided on the positioning plate 1; the limiting part 2 is fixed on the assembly part, and the outer wall of the limiting part 2 has a limiting surface 21, which is used to fit with the inner wall of the pressure cap of the hydraulic end of the plunger pump to stop the pressure cap from rotating.

[0042] Specifically, the positioning plate 1 can be fixedly mounted on the plunger pump hydraulic end suction cover assembly 200 and / or the plunger pump hydraulic end discharge cover assembly 300 according to the position of the nut to be prevented from loosening. The assembly portion formed on the positioning plate 1 is used to mount the limiter 2. The limiter 2 can be fixedly mounted on the assembly portion by means of an assembly hole and a fastener. It must be ensured that the limiter 2 cannot rotate on the positioning plate 1 after being assembled. Preferably, the positioning plate 1 can adopt a long pressure plate structure and be crimped and fixed on the plunger pump hydraulic end suction cover assembly 200 and / or the plunger pump hydraulic end discharge cover assembly 300.

[0043] A limiting surface 21 is formed on the outer wall of the limiting member 2. The limiting surface 21 is pressed against the inner wall of the pressing cap to prevent the pressing cap from rotating. Preferably, the limiting surface 21 is machined on the outer wall of the limiting member 2 to match the inner wall of the pressing cap. The pressing cap generally has a hexagonal inner surface. Then, the limiting surface 21 is also machined into a hexagonal outer surface to limit the rotation of the pressing cap.

[0044] It can be seen that the utility model provides a pressure cap anti-loosening device 100, and the positioning plate 1 can be correspondingly installed on the plunger pump hydraulic end suction cover assembly 200 and / or the plunger pump hydraulic end discharge cover assembly 300, and an assembly portion for fixing the limit member 2 is provided thereon, and the outer limiting surface 21 of the limiting member 2 is fitted with the inner wall surface of the pressure cap, thereby realizing the anti-rotation limit of the pressure cap, forming a pressure cap anti-loosening structure, when the pump is running due to vibration or pressure shock, the pressure cap will not loosen, thereby ensuring the stable connection and sealing effect of the suction pressure cap assembly and / or the discharge pressure cap assembly, and avoiding leakage; and, when the construction operation time is long, since the pressure cap will not loosen, the erosion and wear of the suction pressure cap, the discharge pressure cap and the cylindrical surface of the pump head body are reduced, and the problem of being unable to repair or scrapped due to the above problems is reduced, thereby reducing economic losses.

[0045] In one embodiment of the present invention, the limiting member 2 includes a hexagonal head, the outer wall of the hexagonal head is a hexagonal structure adapted to the inner wall of the pressure cap, and the hexagonal head is inserted into the pressure cap. Specifically, Figure 3 As shown, the retaining member 2 utilizes a hexagonal anti-loosening structure. Its outer wall is a regular hexagonal structure that matches the through hole in the pressure cap. The shape and size are such that the anti-loosening hexagonal head can be inserted precisely into the through hole in the pressure cap. Because the hexagonal head cannot rotate on the positioning plate 1, and the hexagonal head does not rotate relative to the pressure cap due to its limiting surface 21, the positioning plate 1 and the hexagonal head prevent the pressure cap from rotating.

[0046] In one embodiment of the present invention, a first assembly hole 22 is provided on the stopper 2, and the assembly portion includes: an arcuate hole 11 and a first fastener 3. The first assembly hole 22 can be moved within the area of ​​the arcuate hole 11 by rotating the stopper 2, and the first assembly hole 22 and the arcuate hole 11 can be fastened together by the first fastener 3. Specifically, the first assembly hole 22 can be a circular hole, and the dimensions of the arcuate hole 11 can be such that the first assembly hole 22 is included. The arcuate hole 11 is a circular, runway-shaped hole, and the diameter of the first assembly hole 22 can be equal to the diameter of the arc portion at the end of the arcuate hole 11. The purpose of the above design is that since there is no relative rotation between the limiter 2 and the pressure cap, but there may be assembly states of different angles between each pressure cap, therefore, each limiter 2 is also assembled at different angles. Therefore, the arc hole 11 and the first assembly hole 22 can be used to ensure that during the assembly process of the limiter 2 with the positioning plate 1, the limiter 2 has a certain redundant rotation angle on the positioning plate 1 to meet the anti-loosening effect of multiple pressure caps.

[0047] In one embodiment of the present invention, the stopper 2 is provided with a plurality of first assembly holes 22, which are arranged along the circumference of the stopper 2. Specifically, multiple first assembly holes 22 can be provided, and accordingly, multiple arc-shaped holes 11 can also be provided to ensure fastening stability. The first assembly holes 22 are arranged along the circumference of the stopper 2 to allow for rotational allowance during assembly.

[0048] In one embodiment of the present invention, the assembly portion further includes a gasket 4, which is provided on the contact surface between the first fastener 3 and the arc-shaped hole 11. Preferably, the gasket 4 is an elastic gasket 4, which provides a cushioning effect when the first fastener 3 contacts the arc-shaped hole 11, thereby preventing the arc-shaped hole 11 from being worn when the first fastener 3 is tightened.

[0049] In one embodiment of the present invention, the position-limiting member 2 is provided with a plurality of second assembly holes 23. The assembly portion further includes: a plurality of positioning holes 12 and a plurality of second fasteners. The second assembly holes 23 and the positioning holes 12 are fastened together by the second fasteners. In this embodiment, to ensure that the position-limiting member 2 is securely fixed to the positioning plate 1 and prevent rotation, the second fasteners are drilled through a plurality of corresponding second assembly holes 23 and positioning holes 12. The position-limiting member 2 is securely mounted on the positioning plate 1 through a multi-point positioning method.

[0050] In one embodiment of the present invention, the pressure cap anti-loosening device 100 further includes a buckle cover 5, which is disposed on the positioning plate 1 and covers the first fastener 3 inside the buckle cover 5. By installing the buckle cover 5, the first fastener 3 is accommodated inside the buckle cover 5, which not only protects the first fastener 3 but also improves the overall aesthetics.

[0051] In one embodiment of the present invention, the retaining member 2 is provided with a third assembly hole 24, the buckle cover 5 is provided with a fourth assembly hole 51, and the assembly portion further includes a fifth assembly hole 13 and a third fastener 6. The third fastener 6 sequentially passes through and fastens the fourth assembly hole 51, the fifth assembly hole 13, and the third assembly hole 24. In this embodiment, the third fastener 6 sequentially passes through the buckle cover 5, the positioning plate 1, and the retaining member 2 to secure the buckle cover 5 to the positioning plate 1.

[0052] In such Figure 3 In the illustrated embodiment, the third assembly hole 24 on the limiting member 2 is located at the center thereof, and the first assembly hole 22 and the second assembly hole 23 are respectively located on both sides of the third assembly hole 24 and are distributed in a circular manner.

[0053] Optionally, the above-mentioned first fastener 3, second fastener and third fastener 6 can all be bolt fasteners. Correspondingly, the first assembly hole 22 and the second assembly hole 23 are both threaded blind holes designed on the limiter 2, and the third assembly hole 24 is a threaded through hole designed on the limiter 2; and the holes on the positioning plate 1 are all through holes.

[0054] In one embodiment of the present invention, the positioning plate 1 is provided with a plurality of assembly parts, and the limiting members 2 are fixed on the assembly parts in a one-to-one correspondence. Figure 1 As shown, five limiting members 2 and assembly parts are provided, and the limiting members 2 are provided on the corresponding assembly parts.

[0055] According to the above embodiment, the specific assembly process of the pressure cap anti-loosening device 100 is as follows:

[0056] First, insert the anti-loosening hexagonal head into the hexagonal hole of the pressure cap, and fasten the long pressure plate to the anti-loosening hexagonal head through bolts and gaskets 4; then buckle the buckle covers 5 to the corresponding pressure caps and fasten them with bolts to complete the assembly of the entire pressure cap anti-loosening assembly to ensure beauty.

[0057] The present invention further provides a plunger pump, which comprises the pressure cap anti-loosening device 100 in the above embodiment of the present invention.

[0058] The present invention provides a plunger pump, which includes the pressure cap anti-loosening device 100 in the above embodiment of the present invention, and therefore has the same advantages as above.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A pressure cap anti-loosening device, characterized in that: Provided on a plunger pump hydraulic end suction cover assembly (200) and / or a plunger pump hydraulic end discharge cover assembly (300), the pressure cap anti-loosening device (100) comprises: A positioning plate (1) is arranged along the surface of the hydraulic end of the plunger pump, and an assembly portion is provided on the positioning plate (1); A limiting member (2) is fixed on the assembly portion, and an outer wall of the limiting member (2) has a limiting surface (21) for fitting with an inner wall of a pressure cap at the hydraulic end of the plunger pump to prevent the pressure cap from rotating.

2. The pressure cap anti-loosening device according to claim 1, characterized in that: The limiting member (2) comprises a hexagonal head, the outer wall surface of the hexagonal head is a hexagonal structure adapted to the inner wall surface of the pressing cap, and the hexagonal head is inserted into the pressing cap.

3. The pressure cap anti-loosening device according to claim 1 or 2, characterized in that: The limiting member (2) is provided with a first assembly hole (22), and the assembly portion comprises: an arc-shaped hole (11) and a first fastener (3); wherein, By rotating the limiting member (2), the first assembly hole (22) can move in the area where the arc-shaped hole (11) is located, and the first assembly hole (22) and the arc-shaped hole (11) can be fastened by the first fastener (3).

4. The pressure cap anti-loosening device according to claim 3, characterized in that: The limiting member (2) is provided with a plurality of first assembly holes (22), and the plurality of first assembly holes (22) are arranged along the circumferential direction of the limiting member (2).

5. The pressure cap anti-loosening device according to claim 3, characterized in that: The assembly portion further comprises a gasket (4), which is arranged on the contact surface between the first fastener (3) and the arc-shaped hole (11).

6. The pressure cap anti-loosening device according to claim 3, characterized in that: The limiting member (2) is provided with a plurality of second assembly holes (23), and the assembly portion further comprises: a plurality of positioning holes (12) and a plurality of second fasteners; wherein the second assembly holes (23) and the positioning holes (12) are fastened via the second fasteners.

7. The pressure cap anti-loosening device according to claim 3, characterized in that: Also includes: A buckle cover (5) is provided on the positioning plate (1), and the first fastener (3) is covered on the inner side of the buckle cover (5).

8. The pressure cap anti-loosening device according to claim 7, characterized in that: The limiting member (2) is provided with a third assembly hole (24), the buckle cover (5) is provided with a fourth assembly hole (51), and the assembly portion further comprises: a fifth assembly hole (13) and a third fastener (6); wherein, The third fastener (6) passes through and fastens the fourth assembly hole (51), the fifth assembly hole (13), and the third assembly hole (24) in sequence.

9. The pressure cap anti-loosening device according to claim 1 or 2, characterized in that: The positioning plate (1) is provided with a plurality of assembly parts, and the limiting members (2) are fixed on the assembly parts in a one-to-one correspondence.

10. A plunger pump, characterized in that: include: The pressure cap anti-loosening device (100) according to any one of claims 1 to 9.

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