Plunger pump with adjustable limit displacement

Abstract

The utility model relates to the technical field of plunger pumps, in particular to a plunger pump with adjustable limit displacement. The plunger pump with the adjustable limit displacement comprises a pump body, a limit displacement adjusting mechanism is arranged in the pump body, the limit displacement adjusting mechanism comprises a piston, a minimum displacement limiting assembly and a maximum displacement limiting assembly, the minimum displacement limiting assembly is composed of a first hexagon nut, a first adjusting screw, a threaded sleeve and a minimum displacement limiting block, the threaded sleeve is installed in a front shell, and the minimum displacement limiting block is installed in a rear shell. One end of the threaded sleeve is provided with a mounting groove for placing the minimum displacement limiting block, the other end of the threaded sleeve is provided with a threaded hole connected with the first adjusting screw, the first hexagonal nut is connected to the first adjusting screw, and the first adjusting screw is connected with the minimum displacement limiting block; the maximum displacement limiting assembly is composed of a second hexagon nut, a second adjusting screw and a maximum displacement limiting block, the maximum displacement limiting block is arranged in the piston cavity and connected with the second adjusting screw, and the second hexagon nut is connected to the second adjusting screw. The device is flexible to adjust and convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to a plunger pump with adjustable limit displacement. Background Art

[0002] By adjusting the maximum displacement of the plunger pump, unnecessary flow output can be reduced, thereby reducing energy consumption, especially when full load operation is not required; and under different working conditions, by adjusting the maximum displacement, the pump output can be optimized to adapt to changes in flow demand.

[0003] The existing limit displacement adjustment mechanism on the plunger pump includes components such as a screw plug, a piston, a limit block and an O-ring. If the maximum and minimum displacement of the plunger pump are to be changed, the corresponding screw plug and limit block need to be replaced. In addition, the disassembly and assembly are inconvenient and the application is not flexible enough. Utility Model Content

[0004] The technical problem to be solved by the present invention is: in order to solve the problems existing in the prior art in the above-mentioned background technology, a plunger pump with adjustable limit displacement is provided.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a plunger pump with adjustable limit displacement, comprising a pump body, wherein the pump body has a front shell, a rear shell and an intermediate body located between the two.

[0006] The pump body is provided with a limit displacement adjustment mechanism, which includes a piston, a minimum displacement limit assembly and a maximum displacement limit assembly.

[0007] The minimum displacement limit assembly consists of a hexagonal nut, an adjusting screw, a sleeve and a minimum displacement limit block. The sleeve is installed in the front housing. One end of the sleeve is provided with a mounting groove for placing the minimum displacement limit block, and the other end of the sleeve is provided with a threaded hole for connecting the adjusting screw. The hexagonal nut is connected to the adjusting screw, and the adjusting screw is connected to the minimum displacement limit block; the maximum displacement limit assembly consists of a hexagonal nut, a second adjusting screw and a maximum displacement limit block. The maximum displacement limit block is arranged in the piston cavity and is connected to the adjusting screw. A threaded through hole for connecting the adjusting screw is provided on the intermediate body, and the hexagonal nut is connected to the adjusting screw.

[0008] Furthermore, the central axes of the hexagonal nut 1, the adjusting screw 1, the threaded sleeve, the minimum displacement limit block, the hexagonal nut 2, the adjusting screw 2 and the maximum displacement limit block are on the same horizontal line.

[0009] Furthermore, the front shell is provided with an installation cavity for installing the screw sleeve, and the inner wall of the installation cavity is provided with an internal thread.

[0010] Furthermore, the screw sleeve is a T-shaped structure formed by axially connecting two cylinders with different diameters. The small diameter section of the screw sleeve is arranged in the installation cavity, and the surface is provided with an external thread that cooperates with the internal thread of the installation cavity; the large diameter section of the screw sleeve covers the cavity opening of the installation cavity.

[0011] Furthermore, a sealing member is provided between the installation cavity and the screw sleeve, and the sealing member is provided at the cavity opening of the installation cavity.

[0012] Furthermore, the threaded through hole on the intermediate body is communicated with the piston cavity.

[0013] Furthermore, a swash plate is provided in the pump body, the swash plate is connected to a shift block, and the shift block is connected to the piston.

[0014] Furthermore, sealing elements are also provided between the maximum displacement limit block and the inner wall of the piston cavity, and between the minimum displacement limit block and the inner wall of the screw sleeve.

[0015] Furthermore, a rotating component and a main shaft are provided in the pump body, and the main shaft is assembled on the center line of the rotating component.

[0016] Furthermore, the main shaft includes a front main shaft and a rear main shaft connected together, and one end of the front main shaft passes through the front housing and extends outward.

[0017] Beneficial effects of the utility model:

[0018] (1) The central axes of the various parts of the displacement limit adjustment mechanism of the present invention are on a horizontal line, so that the piston can move back and forth in a straight line and stably in the piston chamber, making the maximum and minimum displacement limits more accurate;

[0019] (2) When it is necessary to adjust the minimum displacement, you only need to loosen the hexagonal nut 1 first, then adjust the screw-in depth of the adjusting screw 1 according to the needs, and finally tighten the hexagonal nut 1; similarly, when it is necessary to adjust the maximum displacement, you only need to loosen the hexagonal nut 2 first, then adjust the screw-in depth of the adjusting screw 2 according to the needs, and finally tighten the hexagonal nut 2; that is, by adjusting the screw-in depth of the adjusting screw, the required limit displacement and the limit position of the limit block can be achieved, and at the same time, the position of the piston movement can be limited;

[0020] (3) The utility model is easy to operate and has flexible and varied applications. At the same time, it can make the plunger pump work stably. When parts need to be repaired, it is more convenient to disassemble and assemble than the traditional limit displacement adjustment mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1It is the structural schematic diagram of the utility model.

[0023] Figure 2 It is the enlarged structural schematic diagram of the limit displacement adjusting mechanism in the utility model.

[0024] In the drawing: 1, pump body;11, front shell, 111, installation cavity;12, rear shell;13, intermediate body;2, limit displacement adjusting mechanism;20, piston;21, minimum displacement limiting assembly;211, hexagonal nut one;212, adjusting screw one;213, screw sleeve;214, minimum displacement limiting block;22, maximum displacement limiting assembly;221, hexagonal nut two;222, adjusting screw two;223, maximum displacement limiting block;3, rotating part;4, main shaft;41, front main shaft;42, rear main shaft;5, swash plate;6, control valve;7, shifting block;10, piston cavity. DETAILED DESCRIPTION

[0025] The utility model will be explained further in detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the utility model in a schematic way, so it only shows the components related to the utility model.

[0026] As Figure 1 And Figure 2 Shown, a kind of limit displacement adjustable plunger pump, including pump body 1, pump body 1 has front shell 11, rear shell 12 and the intermediate body 13 between the two, limit displacement adjusting mechanism 2, swash plate 5, rotating part 3 and main shaft 4 are provided in pump body 1, main shaft 4 is assembled on the center line of rotating part 3, control valve 6 is equipped on the outer wall of pump body 1, limit displacement adjusting mechanism 2 includes piston 20, minimum displacement limiting assembly 21 and maximum displacement limiting assembly 22, swash plate 5 is connected with a shifting block 7, shifting block 7 is connected on piston 20. Wherein, main shaft 4 includes front main shaft 41 and rear main shaft 42 connected together, one end of front main shaft 41 passes through front shell 11 and extends outward.

[0027] As Figure 2As shown, the minimum displacement limit assembly 21 consists of a hexagonal nut 211, an adjusting screw 212, a threaded sleeve 213, and a minimum displacement limit block 214. The threaded sleeve 213 is installed in the front housing 11. One end of the threaded sleeve 213 defines a mounting groove for accommodating the minimum displacement limit block 214, and the other end of the threaded sleeve 213 defines a threaded hole for connecting to the adjusting screw 211. The hexagonal nut 211 is connected to the adjusting screw 212, and the adjusting screw 212 is connected to the minimum displacement limit block 214. Specifically, the front housing 11 defines a mounting cavity 111 for mounting the threaded sleeve 213, and the inner wall of the mounting cavity 111 is provided with an internal thread. After the screw sleeve 213 is matched with the installation cavity 111, there is still a certain distance of gap (the gap between the screw sleeve 213 and the bottom surface of the installation cavity 111 is about 8 mm). The purpose is to ensure the activity space of the minimum displacement limit block 214 when the adjusting screw 212 is screwed in. The maximum movement distance of the minimum displacement limit block 214 limits the minimum limit displacement, but its depth cannot be too deep (the maximum depth is 14 mm), otherwise if the adjusting screw 212 is screwed in too deeply, it will not be able to be locked by the hexagonal nut 211. At the same time, the adjusting screw 212 cannot be too long (the maximum length of the adjusting screw 212 exceeding the screw sleeve 213 is 18 mm), otherwise the protruding end of the adjusting screw 212 will be at risk of interfering with the flange mounting surface. The screw sleeve 213 is a T-shaped structure formed by axially connecting two cylinders of different diameters. The small-diameter section of the screw sleeve 213 is located within the mounting cavity 111 and has external threads on its surface that mate with the internal threads of the mounting cavity 111. The large-diameter section of the screw sleeve 213 covers the opening of the mounting cavity 111. A seal is provided between the mounting cavity 111 and the screw sleeve 213, located at the opening of the mounting cavity 111. Seals are also provided between the maximum displacement limit block 223 and the inner wall of the piston cavity 10, and between the minimum displacement limit block 214 and the inner wall of the screw sleeve 213.

[0028] like Figure 2 As shown, the maximum displacement limit assembly 22 consists of a second hexagonal nut 221, a second adjusting screw 222 and a maximum displacement limit block 223. The maximum displacement limit block 223 is arranged in the piston cavity 10 and is connected to the second adjusting screw 222. A threaded through hole for connecting the second adjusting screw 222 is opened on the intermediate body 13. The second hexagonal nut 221 is connected to the second adjusting screw 222, and the threaded through hole on the intermediate body 13 is connected to the piston cavity 10.

[0029] The central axes of hexagonal nut 1 211, adjusting screw 1 212, threaded sleeve 213, minimum displacement stop 214, hexagonal nut 2 21, adjusting screw 2 22, and maximum displacement stop 223 are aligned horizontally, meaning the central axes of these components coincide. This ensures greater stability and precise adjustment of the displacement limit adjustment mechanism 2. Hexagonal nut 1 211 and hexagonal nut 2 221 are standard components, used to tighten adjusting screw 1 212 and adjusting screw 2 22, respectively. They offer easy assembly and disassembly, a simple and compact structure, and stable and reliable performance. Adjusting screw 1 212 and adjusting screw 2 222 are standard components, making adjustment simple and easy.

[0030] The assembly process of the limit displacement adjustment mechanism 2 is as follows:

[0031] First, install the minimum displacement limit block into the installation groove of the screw sleeve 213 214, then screw the screw sleeve 213 into the installation cavity 111, then screw the adjusting screw 212 into the threaded hole of the screw sleeve 213, and then connect and match the hexagonal nut 211 with the adjusting screw 212, and the minimum displacement limit assembly 21 is assembled; install the piston 20 into the piston cavity 10, and then install the maximum displacement limit block 223 into the piston cavity 10, then install the adjusting screw 222 into the threaded through hole of the intermediate body 13, and finally connect and match the hexagonal nut 221 with the adjusting screw 222, and the maximum displacement limit assembly 22 is assembled.

[0032] Adjustment process of the limit displacement adjustment mechanism 2:

[0033] Thanks to the alignment of the central axes of the various components of the displacement limit adjustment mechanism 2, the piston 20 can move back and forth in a straight and stable manner within the piston chamber 10, ensuring more precise control of the maximum and minimum displacements. To adjust the minimum displacement, simply loosen hexagonal nut 1 211, adjust the screw-in depth of adjusting screw 1 212 as needed, and then tighten hexagonal nut 1 211. Similarly, to adjust the maximum displacement, simply loosen hexagonal nut 221, adjust the screw-in depth of adjusting screw 222 as needed, and then tighten hexagonal nut 221 again. The entire minimum displacement limiting process is mainly as follows: when the adjusting screw 212 is screwed in to the specified depth, the position of the minimum displacement limit block 214 will be limited, thereby limiting the extreme position of the piston 20 moving linearly to the left, and achieving the required minimum displacement requirement; the entire large displacement limiting process is mainly as follows: when the adjusting screw 222 is screwed in to the specified depth, the position of the maximum displacement limit block 223 will be limited, thereby limiting the extreme position of the piston 20 moving linearly to the right, and achieving the required maximum displacement requirement.

[0034] The piston 20 in the displacement limit adjustment mechanism 2 reciprocates, driving the shift block 7 to move, thereby pushing the swash plate 5 to deflect, achieving displacement changes for the entire plunger pump. The control valve 6 on the outer wall of the pump body 1 controls the flow of the plunger pump.

[0035] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A plunger pump with adjustable displacement limit, comprising a pump body (1), wherein the pump body (1) comprises a front housing (11), a rear housing (12) and an intermediate body (13) located therebetween, and is characterized in that: The pump body (1) is provided with a limit displacement adjustment mechanism (2), and the limit displacement adjustment mechanism (2) comprises a piston (20), a minimum displacement limit assembly (21), and a maximum displacement limit assembly (22). The minimum displacement limit assembly (21) is composed of a hexagonal nut (211), an adjusting screw (212), a screw sleeve (213) and a minimum displacement limit block (214). The screw sleeve (213) is installed in the front housing (11). One end of the screw sleeve (213) is provided with a mounting groove for placing the minimum displacement limit block (214). The other end of the screw sleeve (213) is provided with a threaded hole for connecting the adjusting screw (213). The hexagonal nut (211) is connected to the adjusting screw (212). Screw 1 (212) is connected to the minimum displacement limit block (214); the maximum displacement limit assembly (22) is composed of hexagonal nut 2 (221), adjusting screw 2 (222) and maximum displacement limit block (223), the maximum displacement limit block (223) is arranged in the piston cavity (10) and is connected to the adjusting screw 2 (222), the intermediate body (13) is provided with a threaded through hole connected to the adjusting screw 2 (222), and the hexagonal nut 2 (221) is connected to the adjusting screw 2 (222).

2. The plunger pump with adjustable limit displacement according to claim 1, characterized in that: The central axes of the hexagonal nut 1 (211), the adjusting screw 1 (212), the threaded sleeve (213), the minimum displacement limit block (214), the hexagonal nut 2 (221), the adjusting screw 2 (222) and the maximum displacement limit block (223) are on the same horizontal line.

3. The plunger pump with adjustable limit displacement according to claim 1, characterized in that: The front housing (11) is provided with a mounting cavity (111) for mounting a screw sleeve (213), and an inner wall of the mounting cavity (111) is provided with an internal thread.

4. The plunger pump with adjustable limit displacement according to claim 3, characterized in that: The screw sleeve (213) is a T-shaped structure formed by axially connecting two cylinders with different diameters. The small diameter section of the screw sleeve (213) is arranged in the installation cavity (111) and has an external thread on its surface that matches the internal thread of the installation cavity (111); the large diameter section of the screw sleeve (213) covers the cavity opening of the installation cavity (111).

5. The plunger pump with adjustable limit displacement according to claim 3, characterized in that: A sealing member is provided between the installation cavity (111) and the screw sleeve (213), and the sealing member is provided at the cavity opening of the installation cavity (111).

6. The plunger pump with adjustable limit displacement according to claim 1, characterized in that: The threaded through hole on the intermediate body (13) is in communication with the piston chamber (10).

7. The plunger pump with adjustable limit displacement according to claim 1, characterized in that: A swash plate (5) is provided in the pump body (1), the swash plate (5) is connected to a shift block (7), and the shift block (7) is connected to the piston (20).

8. The plunger pump with adjustable limit displacement according to claim 1, characterized in that: Seals are also provided between the maximum displacement limit block (223) and the inner wall of the piston chamber (10), and between the minimum displacement limit block (214) and the inner wall of the screw sleeve (213).

9. The plunger pump with adjustable limit displacement according to claim 1, characterized in that: A rotating component (3) and a main shaft (4) are provided in the pump body (1), and the main shaft (4) is assembled on the center line of the rotating component (3).

10. The plunger pump with adjustable limit displacement according to claim 9, characterized in that: The main shaft (4) comprises a front main shaft (41) and a rear main shaft (42) connected together, and one end of the front main shaft (41) passes through the front housing (11) and extends outward.

Images