Pressure-adjustable oil supplementing overflow valve

Abstract

The utility model relates to a pressure-adjustable oil supplementing overflow valve which comprises a cone valve element, a spring, a guide rod, a plug and an adjusting screw rod. The cone valve element is connected with one end of a guide rod, the other end of the guide rod is inserted into a plug, the plug is fixedly connected with a plunger pump body, the guide rod is sleeved with a spring, and an adjusting screw is rotationally connected into the plug. According to the pressure-adjustable oil recharging overflow valve, compared with an existing oil recharging overflow valve in which the pretightening force of a spring is adjusted by increasing or decreasing gaskets, the influence of space on adjustment is greatly reduced, and the quantized oil recharging pressure adjustment does not need tedious disassembly or guarantee of various gasket specifications; the requirement for oil supplementing pressure of a closed system can be accurately met, the disassembling frequency is reduced, and the adjusting efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to closed hydraulic plunger pump technology application field, especially a pressure adjustable oil supplement overflow valve. BACKGROUND

[0002] In the closed plunger pump application system of the skid steer loader, the oil supplement pressure of the low pressure side of the system is set by the oil supplement overflow valve, and the oil supplement pressure has an important control function in the closed system. On the one hand, the oil supplement pressure provides pilot oil pressure for the system's working and walking control handle, and on the other hand, the oil supplement pressure provides unbraking oil pressure for the walking motor.

[0003] The oil supplement pressure of the system is realized by installing the oil supplement overflow valve in the circuit of the oil supplement pump, and the oil supplement pressure requirements of the low pressure side of the system are different for each host application company due to the pressure characteristics of the pilot control handle of each host company and the differentiation of the unbraking pressure of the motor of different manufacturers.

[0004] At present, the design of the oil supplement overflow valve has fully considered the necessity of oil supplement pressure adjustment, but adjustment is required by disassembly, such as Figure 1 As shown in the structural schematic diagram of the current oil supplement overflow valve, the plug 4 is locked by threads on the plunger pump oil supplement circuit, the pre-tightening force of the spring 2 is adjusted by increasing or decreasing the gasket 45, and thus the oil supplement pressure is adjusted. Since the oil supplement overflow valve assembly is installed on the plunger pump oil supplement circuit by threaded connection, the plug needs to be disassembled to increase or decrease the gasket, and the plunger pump is installed under the cab, which has certain limitations in disassembly space; secondly, the quantized oil supplement pressure requires more types of adjustment gaskets; thirdly, the increase or decrease of the gasket cannot obtain the expected oil supplement pressure at one time, and due to the existence of the oil supplement pressure, in order to prevent oil leakage during adjustment and the accuracy of pressure adjustment, the plug needs to be locked each time the gasket is increased or decreased, so the labor intensity is large and the efficiency is low for oil supplement pressure adjustment.

[0005] Therefore, there is an urgent need in the technical field to develop a pressure-adjustable oil supplement overflow valve that can accurately meet the oil supplement pressure requirements of the closed system, reduce the installation space restrictions on adjustment, reduce the disassembly frequency, reduce the labor intensity, and improve the adjustment efficiency. UTILITY MODEL CONTENTS

[0006] In view of the problems of large labor intensity caused by repeated disassembly of the increase or decrease of the gasket, the multiple types of gaskets caused by quantized pressure, and the low efficiency of repeated adjustment in the existing closed plunger pump system application, a pressure-adjustable oil supplement overflow valve is proposed.

[0007] The utility model discloses a technical scheme for a pressure-adjustable oil supplementing overflow valve, which comprises a cone valve core, a spring, a guide rod, a plug, and an adjusting screw rod.

[0008] Preferably, the cone valve core has a sleeve at one end, the inside of the sleeve is provided with a cone valve core counterbore, and the other end of the guide rod is inserted into the sleeve and connected with the cone valve core through the cone valve core counterbore.

[0009] Preferably, the spring is sleeved on the outside of the sleeve, the sleeve is connected with the cone valve core body at a position provided with a cone valve core shoulder, and one end of the spring is located at the cone valve core shoulder.

[0010] Preferably, the plug has external threads at one end, and the plug is threadedly connected with the plunger pump body through the external threads.

[0011] Preferably, the plug has a plug shoulder at a position close to the external threads on the outside of the plug, an O-ring for sealing oil is sleeved on the outside of the plug, and the O-ring is located at the plug shoulder.

[0012] Preferably, the plug has a through hole along the axis inside the plug, the plug is provided with a spring seat inside, the spring seat is in the shape of a ring, the other end of the guide rod away from the cone valve core passes through the center hole of the spring seat, one end of the spring away from the cone valve core is located at one side of the spring seat, and the other side of the spring seat is located at one end of the adjusting screw rod.

[0013] Preferably, the plug is provided with internal threads inside the plug at a position away from the spring seat, the adjusting screw rod is provided with external threads, and the plug is threadedly connected with the adjusting screw rod.

[0014] Preferably, the adjusting screw rod is provided with an adjusting counterbore at one end inside the adjusting screw rod for inserting the guide rod when adjusting the spring; and the other end of the adjusting screw rod away from the spring seat is provided with an internal hexagonal hole for facilitating adjustment.

[0015] Preferably, the adjusting screw rod is threadedly connected with a nut on the outside of the adjusting screw rod, the nut is located at a position away from the cone valve core of the plug, and an O-ring for sealing oil is arranged between the nut and the plug.

[0016] Preferably, the adjusting screw rod is threadedly connected with a nut on the outside of the adjusting screw rod, the nut is located at a position away from the cone valve core of the plug, and an O-ring for sealing oil is arranged between the nut and the plug.

[0017] The utility model discloses an advantageous effect lies in: the utility model provides a pressure adjustable type oil supplementing overflow valve, compared with the spring pre -tightening force mode of adjusting of the existing oil supplementing overflow valve through the mode of increasing or reducing the gasket, the influence of space to the adjustment is greatly reduced, secondly, the quantitative oil supplementing pressure adjustment does not need complicated dismounting and a plurality of gasket specifications guarantee, can accurately satisfy the closed system oil supplementing pressure requirement, reduces the disassembly frequency, improves the adjustment efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structural diagram of the existing oil supplementing overflow valve;

[0019] Figure 2 It is the structural diagram of the utility model pressure adjustable type oil supplementing overflow valve;

[0020] Figure 3 It is the structural diagram of the utility model installation in the plunger pump oil supplementing circuit.

[0021] In the drawing, the component name corresponding to each reference sign is as follows:

[0022] 1, cone valve core;11, sleeve;12, cone valve core shoulder;13, cone valve core counterbore;2, spring;3, guide rod;4, plug;41, external thread;42, spring seat;43, internal thread;44, plug shoulder;45, gasket;5, nut;6, O ring;7, adjusting screw;71, adjusting counterbore;72, internal hexagonal hole;8, nut;9, O ring. DETAILED DESCRIPTION

[0023] The utility model will be described in detail below in combination with the drawings and specific embodiment. This embodiment is implemented on the premise of the technical scheme of the utility model, gives detailed implementation mode and specific operation process, but the protection scope of the utility model is not limited to the following examples.

[0024] Reference Figure 2 As shown in the application embodiment discloses a pressure adjustable type oil supplementing overflow valve, including cone valve core 1, spring 2, guide rod 3, plug 4, adjusting screw 7;Cone valve core 1 is connected to one end of guide rod 3, the other end of guide rod 3 is inserted into plug 4, plug 4 is fixedly connected with plunger pump body, the outside of guide rod 3 is provided with spring 2, and adjusting screw 7 is rotatably connected in the inside of plug 4;The pre-tightening force of spring 2 is formed by adjusting adjusting screw 7, and the size of the pre-tightening force limits the oil supplementing pressure, and the oil pressure in the oil supplementing circuit is set by the pre-tightening force of spring 2;

[0025] Cone valve core 1 one end is equipped with the hollow sleeve 11, and the inside center of sleeve 11 is cone valve core counterbore 13, and one end of guide rod 3 is inserted into sleeve 11, and is connected with cone valve core 1 through cone valve core counterbore 13;

[0026] Spring 2 is sleeved outside the sleeve 11, the sleeve 11 is connected with the spool body, and the spool shoulder 12 is arranged at the connection position. One end of the spring 2 is arranged at the spool shoulder 12.

[0027] The outer side of one end of the plug 4 is provided with external threads 41, and the plug 4 is screwed with the pump body of the plunger pump through the external threads 41.

[0028] The outer side of the plug 4 is provided with a plug shoulder 44 near the external threads 41, and the outer side of the plug 4 is sleeved with an O-ring 9, and the O-ring 9 is arranged at the plug shoulder 44. The O-ring 9 is used for oil sealing at the position.

[0029] The plug 4 is a through hole along the axis, and the plug 4 is provided with a spring seat 42. The spring seat 42 is a circular ring, the guide rod 3 is arranged through the center hole of the spring seat 42, the spring 2 is arranged at one side of the spring seat 42, and the other side of the spring seat 42 is arranged at one end of the adjusting screw 7.

[0030] The inner side of the plug 4 is provided with internal threads 43 at the side away from the spring 2, and the outer side of the adjusting screw 7 is provided with threads. The plug 4 is screwed with the adjusting screw 7.

[0031] The adjusting screw 7 is provided with an adjusting counterbore 71 at one end, so that the guide rod 3 is inserted into the adjusting counterbore 71 when the adjusting spring 2 is adjusted. The adjusting screw 7 is provided with an inner hexagonal hole 72 at the end away from the spring seat 42, so that a hexagonal wrench can be used to adjust conveniently.

[0032] The adjusting screw 7 is screwed with the nut 5, and the nut 5 is arranged at the side away from the spool 1 of the plug 4. The nut 5 is provided with the O-ring 6 between the nut 5 and the plug 4.

[0033] The adjusting screw 7 is screwed with the nut 5, and the nut 5 is arranged at the side away from the spool 1 of the plug 4. The nut 5 is provided with the O-ring 6 between the nut 5 and the plug 4.

[0034] The adjusting structure is sealed by the nut 5 and the nut 5 and the O-ring 6.

[0035] The specific working mode is as follows: Figure 3As shown, the pressure-adjustable oil supplement overflow valve is installed into an oil supplement circuit of the plunger pump, the taper surface of the spool valve core 1 is tangent to the edge of the oil supplement circuit through hole, the plug 4 is locked by threads on the internal threads of the plunger pump, the plug shoulder 44 is limited by the flat surface of the plunger pump body, and the O-ring 9 is extruded and deformed to realize oil sealing at the position; secondly, the adjusting screw 7 locked on the plug 4 supports the spring seat 42 to form a pre-tightening force on the spring 2, and then the size of the pre-tightening force limits the oil supplement pressure, and the oil pressure in the oil supplement circuit is set by the pre-tightening force of the spring 2; when the system oil supplement pressure is lower than the expected value, the spring 2 is compressed by the internal hex of the adjusting screw 7, and then the oil supplement pressure of the low-pressure side system will be increased; on the contrary, when the system oil supplement pressure is higher than the expected value, the spring 2 is loosened by the internal hex of the adjusting screw 7, and then the oil supplement pressure of the low-pressure side system will be reduced, and after the nut 5 and the nut 8 are tightened, the adjusting structure is sealed.

[0036] The pressure-adjustable oil supplement overflow valve is provided, and compared with the spring pre-tightening force adjusting mode of the existing oil supplement overflow valve by increasing or decreasing the gasket, the influence of space on the adjustment is greatly reduced, and the quantitative oil supplement pressure adjustment does not need complicated disassembly and various gasket specifications, which can accurately meet the closed system oil supplement pressure requirement, reduces the disassembly frequency, and improves the adjusting efficiency.

[0037] It should be noted that the above terms "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The meaning of "a plurality of" is two or more. "Mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected.

[0038] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form or in essence. It should be noted that those skilled in the art can make some improvements and supplements without departing from the present application, and these improvements and supplements should also be considered as the protection scope of the present application. Any equivalent changes, modifications and evolutions made by those skilled in the art without departing from the spirit and scope of the present application, and all equivalent embodiments of the present application, are still within the scope of the technical solutions of the present application.

Claims

1. A pressure-adjustable oil replenishment relief valve, characterized in that, It includes a cone valve core (1), a spring (2), a guide rod (3), a plug (4), and an adjusting screw (7); the cone valve core (1) is connected to one end of the guide rod (3), the other end of the guide rod (3) is inserted into the plug (4), the plug (4) is fixedly connected to the pump body of the plunger pump, the guide rod (3) is fitted with a spring (2) on the outside, and the adjusting screw (7) is rotatably connected inside the plug (4); 2. The pressure-adjustable oil replenishment relief valve according to claim 1, characterized in that, The cone valve core (1) has a sleeve (11) at one end. The inner center of the sleeve (11) is the cone valve core countersunk hole (13). One end of the guide rod (3) is inserted into the sleeve (11) and connected to the cone valve core (1) through the cone valve core countersunk hole (13).

3. The pressure-adjustable oil replenishment relief valve according to claim 2, characterized in that, The spring (2) is sleeved on the outside of the sleeve (11). The sleeve (11) and the cone valve core (1) body are provided with a cone valve core shoulder (12). One end of the spring (2) abuts against the cone valve core shoulder (12).

4. The pressure-adjustable oil replenishment relief valve according to claim 1, characterized in that, The plug (4) has an external thread (41) on the outer side of one end, and the plug (4) is threaded to the plunger pump body through the external thread (41).

5. The pressure-adjustable oil replenishment relief valve according to claim 4, characterized in that, The plug (4) has a plug shoulder (44) on its outer side near the external thread (41), and an O-ring (9) for sealing the oil is fitted on the outer side of the plug (4), with the O-ring (9) abutting against the plug shoulder (44).

6. The pressure-adjustable oil replenishment relief valve according to claim 1, characterized in that, The plug (4) has a through hole along the axis inside. The plug (4) has a spring seat (42) inside. The spring seat (42) is annular. The end of the guide rod (3) away from the cone valve core (1) passes through the center hole of the spring seat (42). The end of the spring (2) away from the cone valve core (1) abuts against one side of the spring seat (42). The other side of the spring seat (42) abuts against one end of the adjusting screw (7).

7. The pressure-adjustable oil replenishment relief valve according to claim 6, characterized in that, The plug (4) on the side of the spring seat (42) away from the spring (2) has an internal thread (43), and the adjusting screw (7) has a thread on the outside. The plug (4) is threaded to the adjusting screw (7).

8. The pressure-adjustable oil replenishment relief valve according to claim 7, characterized in that, The adjusting screw (7) has an adjusting countersunk hole (71) inside one end, which allows the guide rod (3) to be inserted when the adjusting spring (2) is adjusted; the adjusting screw (7) has an internal hexagonal hole (72) inside the other end away from the spring seat (42) for easy adjustment.

9. The pressure-adjustable oil replenishment relief valve according to claim 7, characterized in that, The adjusting screw (7) is threaded to a nut (5) on the outside. The nut (5) is located on the side of the plug (4) away from the cone valve core (1). An O-ring (6) for sealing the oil is provided between the nut (5) and the plug (4).

10. The pressure-adjustable oil replenishment relief valve according to claim 7, characterized in that, The adjusting screw (7) is threaded to a nut (8) on the outside. The nut (8) is located on the side of the nut (5) away from the plug (4). An O-ring (6) for sealing the oil is provided between the nut (8) and the nut (5).

Images