Plunger pump and swash plate limiting variable structure thereof

Abstract

The utility model provides a plunger pump and a swash plate limiting variable structure thereof. The swash plate limiting variable structure comprises a shell, a first adjusting component and a second adjusting component. A swash plate capable of adjusting the angle is installed in the shell, and the upper portion and the lower portion of the shell are each provided with an installation hole which faces the direction of the shaft head and is communicated with the swash plate. The first adjusting part is mounted in a lower mounting hole of the shell and is used for limiting the minimum displacement of the swash plate; the second adjusting component is installed in an upper installation hole of the shell and used for limiting the maximum displacement of the swash plate and conducting variable control over the swash plate. The tilting tray is used for limiting the maximum angle and the minimum angle of the tilting tray and controlling the angle change of the tilting tray, the overall structure is simplified, the weight is reduced, and the power density of the pump is improved.

Description

Technical Field

[0001] The utility model relates to a plunger pump swash plate limit variable structure, belonging to the technical field of plunger pumps. Background Art

[0002] Swash plate piston pumps vary the pump's output flow rate by changing the swash plate angle to meet the demands of the actuator. The maximum angle of the piston pump's swash plate is determined during design. However, in practice, there are varying requirements for the maximum and minimum displacements, as well as the variations in displacement. Therefore, the swash plate angle's limits and variations must be considered in piston pump design.

[0003] An existing plunger pump swash plate variable limit structure scheme is as follows: the piston is installed in the housing, forming a large and small cavity at both ends, the piston is parallel to the main shaft, the piston and the swash plate are hinged, and a spring is installed at the small cavity end of the piston to reset the swash plate. The high-pressure oil after the pump enters the large and small cavities of the piston through the control valve, pushing the swash plate variable. Adjustment screws are installed at both ends of the piston cavity of the housing to limit the maximum and minimum strokes of the piston, thereby limiting the maximum and minimum angles of the swash plate.

[0004] The existing plunger pump swash plate limit variable structure has the following disadvantages: many parts, including a piston, a shift block hinged between the piston and the swash plate, a large housing space, and a low power-to-weight ratio of the product; and the high precision of the piston and housing increases the processing cost. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the utility model provides a plunger pump swash plate limit variable structure for limiting the maximum and minimum angles of the swash plate and controlling the angle change of the swash plate. The overall structure is simplified, the weight is reduced, and the power density of the pump is improved.

[0006] The utility model is implemented according to the following technical solutions:

[0007] In a first aspect, the utility model provides a plunger pump swash plate limit variable structure, comprising:

[0008] A housing, inside which a swash plate capable of adjusting its angle is installed, wherein the upper and lower parts of the housing each have a mounting hole facing the shaft head and communicating with the swash plate;

[0009] a first adjusting component, mounted in a lower mounting hole of the housing, for limiting a minimum displacement of the swash plate;

[0010] The second regulating component is installed in the upper mounting hole of the housing and is used to limit the maximum displacement of the swash plate and perform variable control of the swash plate.

[0011] In some embodiments, the first adjusting component is a screw, and the lower mounting hole is a threaded hole inclined downward; the screw is screwed into the threaded hole until the front end of the screw rests on the plane below the swash plate, adjusting and limiting the minimum angle of the swash plate.

[0012] In some embodiments, a sealing nut is screwed onto the screw located outside the housing, which is used to seal the oil in the threaded hole on the one hand and to lock the screw on the other hand.

[0013] In some embodiments, the axial surface of the tail end of the screw is provided with an inner hexagonal countersunk hole extending inward, or the tail end cylinder of the screw is configured as an outer hexagonal column.

[0014] In some embodiments, the upper mounting hole is a threaded hole inclined upward; the second adjusting component includes a swash plate return spring, a control valve and a connecting piece; the swash plate return spring is installed between the swash plate and the housing cavity to reset the swash plate to the maximum angle; the control valve is screwed into the threaded hole, and the front end of the control valve is against the swash plate through the connecting piece to control the maximum angle and variable form of the swash plate.

[0015] In some embodiments, the connecting member includes a hemisphere and a hemisphere return spring; the inclined plate opens a ball socket on the side facing the control valve, and the hemisphere return spring is installed at the bottom of the ball socket; the hemisphere is installed in the ball socket, and the plane of the hemisphere contacts the front end of the control valve.

[0016] In some embodiments, one end of the swash plate return spring is sleeved on the boss of the swash plate, and the other end of the swash plate return spring is pressed against the groove in the housing cavity.

[0017] In a second aspect, the utility model provides a plunger pump, comprising the above-mentioned plunger pump swash plate limit variable structure.

[0018] Beneficial effects of the utility model:

[0019] This utility model provides a plunger pump swash plate variable displacement structure with a compact housing and reduced weight. Threaded oblique holes are provided on both sides of the housing for mounting screws and control valves, respectively, to limit the minimum and maximum angles of the swash plate and provide variable control. The control valve can be designed based on the desired control method. The structure is simple with fewer parts, improving the product's power-to-weight ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0021] In the attached figure:

[0022] Figure 1 This is a cross-sectional view of a variable displacement structure of a swash plate of a plunger pump according to the present invention.

[0023] Figure identification: 1-housing, 2-screw, 3-sealing nut, 4-control valve, 5-swash plate return spring, 6-swash plate, 7-hemispherical return spring, 8-hemispherical.

[0024] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0027] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0028] like Figure 1As shown, a plunger pump swash plate limit variable structure includes a housing 1, a first adjusting component and a second adjusting component; a swash plate 6 with an adjustable angle is installed inside the housing 1, and the upper and lower parts of the housing 1 are each provided with a mounting hole facing the shaft head and connected to the swash plate 6; the first adjusting component is installed in the lower mounting hole of the housing 1, and is used to limit the minimum displacement of the swash plate 6; the second adjusting component is installed in the upper mounting hole of the housing 1, and is used to limit the maximum displacement of the swash plate 6 and perform variable control of the swash plate 6.

[0029] The first adjusting component mentioned above is further described below.

[0030] Continue to refer to Figure 1 As shown, the first adjusting component is a screw rod 2, and the lower mounting hole is a threaded hole inclined downward; the screw rod 2 is screwed into the threaded hole until the front end of the screw rod 2 rests on the plane below the swash plate 6, adjusting and limiting the minimum angle of the swash plate 6.

[0031] For further solutions, please refer to Figure 1 As shown, a sealing nut 3 is screwed into the screw rod 2 located outside the housing 1 , which is used to seal the oil in the threaded hole on the one hand and to lock the screw rod 2 on the other hand.

[0032] For further solutions, please refer to Figure 1 As shown, the axial surface of the tail end of the screw rod 2 is provided with an inner hexagonal countersunk hole extending inward, or the tail end cylinder of the screw rod 2 is set as an outer hexagonal column for rotating the screw rod 2 with a wrench.

[0033] The second adjusting component mentioned above is further described below.

[0034] Continue to refer to Figure 1 As shown, the upper mounting hole is a threaded hole inclined upward; the second adjusting component includes a swash plate return spring 5, a control valve 4 and a connecting piece; the swash plate return spring 5 is installed between the swash plate 6 and the housing cavity to reset the swash plate 6 to the maximum angle; the control valve 4 is screwed into the threaded hole, and the front end of the control valve 4 is abutted against the swash plate 6 through the connecting piece to control the maximum angle and variable form of the swash plate 6; the control valve 4 can be designed according to different control mode requirements to achieve different form variables.

[0035] For further solutions, please refer to Figure 1 As shown, the connecting part includes a hemisphere 8 and a hemisphere return spring 7; the swash plate 6 opens a ball socket on the side facing the control valve 4, and the hemisphere return spring 7 is installed at the bottom of the ball socket; the hemisphere 8 is installed in the ball socket, and the plane of the hemisphere 8 contacts the front end of the control valve 4.

[0036] For further solutions, please refer to Figure 1As shown, one end of the swash plate return spring 5 is sleeved on the boss of the swash plate 6, and the other end of the swash plate return spring 5 is against the groove in the housing cavity.

[0037] In summary, the utility model provides a plunger pump swash plate limit variable structure, with threaded oblique holes provided on both sides of the housing, a screw installed in the lower oblique hole to adjust and limit the minimum angle of the swash plate, and a sealing nut installed between the screw and the housing for locking and sealing. A control valve is installed in the upper oblique hole, a ball socket is provided on the swash plate, a hemispherical return spring is installed at the bottom of the ball socket, and a hemisphere is installed on the upper part. The end face of the control valve is against the plane of the hemisphere to limit the maximum angle of the swash plate and control the change of the swash plate angle for variable adjustment. The control valve can be designed according to different control mode requirements to achieve different forms of variables. A swash plate return spring is installed between the housing cavity and the swash plate to reset the swash plate to the maximum angle. The overall structure is simplified, the weight is reduced, and the power density of the pump is improved.

[0038] The plunger pump provided by the present invention is described below. The plunger pump described below and the plunger pump swash plate limit variable structure described above can be referred to each other.

[0039] The utility model provides a plunger pump, which may include the plunger pump swash plate limit variable structure as described in any one of the above embodiments.

[0040] The beneficial effects achieved by the plunger pump provided by the present invention are consistent with the beneficial effects achieved by the plunger pump swash plate limit variable structure provided by the present invention, and will not be described in detail here.

[0041] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0042] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0043] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A plunger pump swash plate limit variable structure, characterized in that: include: A housing, inside which a swash plate capable of adjusting its angle is installed, wherein the upper and lower parts of the housing each have a mounting hole facing the shaft head and communicating with the swash plate; a first adjusting component, mounted in a lower mounting hole of the housing, for limiting a minimum displacement of the swash plate; a second regulating member, mounted in an upper mounting hole of the housing, for limiting the maximum displacement of the swash plate and performing variable control of the swash plate; The first adjusting component is a screw, and the lower mounting hole is a threaded hole inclined downward; The screw is screwed into the threaded hole until the front end of the screw contacts the plane below the swash plate, thereby adjusting and limiting the minimum angle of the swash plate. The upper mounting hole is a threaded hole inclined upward; The second adjusting component includes a swash plate return spring, a control valve and a connecting piece; the swash plate return spring is installed between the swash plate and the housing cavity to reset the swash plate to the maximum angle; the control valve is screwed into the threaded hole, and the front end of the control valve is abutted against the swash plate through the connecting piece to control the maximum angle and variable form of the swash plate.

2. A plunger pump swash plate limit variable structure according to claim 1, characterized in that: A sealing nut is screwed into the screw located outside the housing, which is used to seal the oil in the threaded hole on the one hand and to lock the screw on the other hand.

3. The plunger pump swash plate limit variable structure according to claim 1, characterized in that: The axial surface of the tail end of the screw is provided with an inner hexagonal countersunk hole extending inwards, or the tail end cylinder of the screw is configured as an outer hexagonal column.

4. The plunger pump swash plate limit variable structure according to claim 1, characterized in that: The connecting piece includes a hemisphere and a hemisphere return spring; the swash plate has a ball socket on the side facing the control valve, and the hemisphere return spring is installed at the bottom of the ball socket; the hemisphere is installed in the ball socket, and the plane of the hemisphere contacts the front end of the control valve.

5. The plunger pump swash plate limit variable structure according to claim 1, characterized in that: One end of the swash plate return spring is sleeved on the boss of the swash plate, and the other end of the swash plate return spring is pressed against the groove in the housing cavity.

6. A plunger pump, characterized in that: The invention comprises the plunger pump swash plate limit variable structure according to any one of claims 1 to 5.

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