Pressure limiting valve for oiler

Abstract

The utility model relates to oiler supporting component technical field, concretely is a kind of pressure-limiting valve for oiler, including valve shell, the valve shell is hollow cavity, the upper surface of valve shell end part is equipped with oil inlet, the lower surface of another end of valve shell is equipped with oil outlet, two chutes are symmetrically equipped in the both ends of valve shell cavity, and the chute of valve shell is slidably connected with guiding assembly;The guiding assembly includes valve core and hydraulic rod, the valve core is located the central position of valve shell cavity, two guiding blocks are fixedly connected in the both sides of valve core, the surface of guiding block is equipped with the sliding block slidably connected with chute, the surface of valve core is fixedly installed with pressure-limiting block, the inner wall of valve shell is fixedly installed with hydraulic rod, and the surface of hydraulic rod is equipped with spring.The utility model, by setting the cooperation of valve core and pressure-limiting block, and under the auxiliary action of sliding block, avoid the situation that valve core appears certain degree deflection due to uneven pressure distribution.

Description

Technical Field

[0001] This utility model relates to the field of oil injector accessories, and in particular to a pressure relief valve for an oil injector. Background Technology

[0002] In industrial production, the lubricator is a key device for delivering lubricating grease to friction pairs such as bearings and gears in various mechanical equipment. The stability of its working pressure directly affects the operating accuracy, service life and safe production of the equipment. The pressure relief valve, as the core safety component of the lubricator's oil circuit system, plays an important role in automatically releasing oil and reducing pressure when the oil circuit pressure exceeds the preset threshold. It is the "first line of defense" to ensure the safe operation of the lubricator and downstream equipment.

[0003] In daily work, it has been found that under the strong action of high-pressure oil flow, the valve core of the oil injector pressure relief valve is often prone to a certain degree of deflection due to the uneven pressure distribution caused by its cylindrical slide valve structure design. This deflection not only affects the normal working performance of the valve core, but may also further cause the overall operation of the oil injection system to be unstable. Utility Model Content

[0004] The purpose of this invention is to address the problem that in the prior art, the valve core of the pressure relief valve for oil injectors is prone to deflection due to uneven pressure distribution under the strong action of high-pressure oil flow. Therefore, this invention proposes a pressure relief valve for oil injectors.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a pressure relief valve for an oil injector, comprising a valve housing, the valve housing being a hollow cavity, an oil inlet being provided on the upper surface of one end of the valve housing, an oil outlet being provided on the lower surface of the other end of the valve housing, two sliding grooves being symmetrically provided at both ends of the valve housing cavity, and a guide assembly being slidably connected to the sliding groove of the valve housing;

[0006] The guide assembly includes a valve core and a hydraulic rod. The valve core is cylindrical and located at the center of the valve housing cavity. Two guide blocks are fixedly connected to both sides of the valve core. Each guide block has a slider that is slidably connected to a groove on its surface. A pressure limiting block is fixedly installed on the surface of the valve core. The hydraulic rod is fixedly installed on the inner wall of the valve housing. The support end of the hydraulic rod is fixedly installed on the surface of the guide block near the oil drain port.

[0007] Preferably, the slider surface has three or more openings at equal intervals, and each opening of the slider is rotatably connected to a ball bearing, which is rotatably connected to the slide groove.

[0008] Preferably, a first sealing ring is fixedly installed on the side of the pressure limiting block near the oil inlet, and the first sealing ring is sleeved on the surface of the valve core.

[0009] Preferably, the pressure limiting block has an annular balancing cavity at its end, and two second sealing rings are symmetrically installed on both sides of the annular balancing cavity.

[0010] Preferably, a main pipe is provided at the center of the valve core, and a first branch pipe is provided on the side of the main pipe near the oil inlet. One side of the first branch pipe is connected to the main pipe, and the other side of the first branch pipe is connected to the cavity inside the valve housing near the oil inlet.

[0011] Preferably, two second branch pipes are symmetrically arranged on the side of the main pipe away from the first branch pipe, and one side of each second branch pipe is connected to the main pipe and the other side of the second branch pipe is connected to the annular balance cavity.

[0012] Preferably, a spring is sleeved on the surface of the hydraulic rod, with one end of the spring fixedly installed on the inner wall of the valve body and the other end fixedly installed on the surface of the guide block.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] In this invention, by pre-setting the pressure threshold values ​​of the spring and hydraulic rod, when the pressure in the oil injection system rises and exceeds the threshold set by the spring and hydraulic rod, the thrust of the oil on the pressure limiting block is greater than the supporting force of the spring and hydraulic rod, and the valve core begins to move towards the oil outlet. During the movement of the valve core, the sliders at both ends slide along the slide groove, and the rolling balls on the surface of the slider greatly reduce the sliding friction resistance with the slide groove, making the valve core move more smoothly. At the same time, the high-pressure oil will also enter the annular balance chamber through the first branch pipe, the main pipe and the second branch pipe inside the valve core, and act evenly on the outer periphery of the pressure limiting block. This uniform radial force further offsets the unbalanced force that the valve core may be subjected to, ensuring that the valve core always moves along the axis of the valve shell, effectively preventing the occurrence of jamming. Attached Figure Description

[0015] Figure 1 A three-dimensional structural diagram of a pressure relief valve for an oil injector is provided for this utility model;

[0016] Figure 2 This utility model provides an overall sectional view of a pressure relief valve for an oil injector;

[0017] Figure 3 This utility model provides a structural schematic diagram of a pressure limiting block and valve core for a pressure limiting valve used in an oil injector;

[0018] Figure 4 This utility model provides a structural schematic diagram of a pressure relief valve guide block for an oil injector;

[0019] Figure 5 This utility model provides a structural schematic diagram of a guide assembly for a pressure relief valve used in an oil injector.

[0020] Legend: 1. Valve housing; 2. Oil inlet; 3. Oil outlet; 4. Slide groove; 5. Guide assembly; 51. Guide block; 511. Slider; 512. Ball bearing; 52. Hydraulic rod; 521. Spring; 53. Pressure limiting block; 531. First sealing ring; 532. Second sealing ring; 533. Annular balance chamber; 54. Valve core; 541. Main pipe; 542. First branch pipe; 543. Second branch pipe. Detailed Implementation

[0021] Please see Figure 1-5 This utility model provides a technical solution: a pressure relief valve for an oil injector, including a valve shell 1, the valve shell 1 being a hollow cavity, an oil inlet 2 being provided on the upper surface of one end of the valve shell 1, an oil outlet 3 being provided on the lower surface of the other end of the valve shell 1, two sliding grooves 4 being symmetrically provided at both ends of the cavity of the valve shell 1, and a guide component 5 being slidably connected to the sliding grooves 4 of the valve shell 1.

[0022] In this embodiment: the guide assembly 5 includes a valve core 54 and a hydraulic rod 52. The valve core 54 is cylindrical and located at the center of the valve housing 1 cavity. Two guide blocks 51 are fixedly connected to both sides of the valve core 54. The surface of each guide block 51 is provided with a slider 511 that is slidably connected to the slide groove 4. A pressure limiting block 53 is fixedly installed on the surface of the valve core 54. The hydraulic rod 52 is fixedly installed on the inner wall of the valve housing 1. The support end of the hydraulic rod 52 is fixedly installed on the surface of the guide block 51 near the oil drain port 3. A spring 521 is sleeved on the surface of the hydraulic rod 52.

[0023] Specifically, the slider 511 has three or more openings at equal intervals on its surface, and each opening of the slider 511 is rotatably connected to a ball bearing 512, which is rotatably connected to the groove 4.

[0024] In this embodiment, the ball bearings 512 on the surface of the slider 511 greatly reduce the sliding friction resistance with the groove 4, making the valve core 54 move more smoothly.

[0025] Specifically, a first sealing ring 531 is fixedly installed on the side of the pressure limiting block 53 near the oil inlet 2, and the first sealing ring 531 is sleeved on the surface of the valve core 54.

[0026] Specifically, the pressure limiting block 53 has an annular balance cavity 533 at its end, and two second sealing rings 532 are symmetrically installed on both sides of the annular balance cavity 533.

[0027] In this embodiment, the first sealing ring 531 and the second sealing ring 532 are tightly fitted to the outer periphery of the pressure limiting block 53 and the inner wall of the valve housing 1 to prevent high-pressure oil from leaking between the pressure limiting block 53 and the valve housing 1.

[0028] Specifically, a main pipe 541 is provided at the center of the valve core 54, and a first branch pipe 542 is provided on the side of the main pipe 541 near the oil inlet 2. One side of the first branch pipe 542 is connected to the main pipe 541, and the other side of the first branch pipe 542 is connected to the cavity inside the valve housing 1 near the oil inlet 2.

[0029] Specifically, the main pipe 541 is provided with two second branch pipes 543 symmetrically on the side away from the first branch pipe 542. One side of each second branch pipe 543 is connected to the main pipe 541, and the other side of each second branch pipe 543 is connected to the annular balance cavity 533.

[0030] In this embodiment, high-pressure oil enters the annular balance chamber 533 through the first branch pipe 542, the main pipe 541 and the second branch pipe 543 inside the valve core 54, and acts evenly on the outer periphery of the pressure limiting block 53. This uniform radial force further counteracts the unbalanced force that the valve core 54 may be subjected to, ensuring that the valve core 54 always moves along the axis of the valve housing 1.

[0031] Specifically, a spring 521 is sleeved on the surface of the hydraulic rod 52. One end of the spring 521 is fixedly installed on the inner wall of the valve body 1, and the other end is fixedly installed on the surface of the guide block 51.

[0032] In this embodiment, the spring 521 and the hydraulic rod 52 apply opposite supporting forces to the valve core 54. When the oil pressure is less than the threshold set by the spring 521 and the hydraulic rod 52, the valve core 54 can be kept in the initial position.

[0033] Working principle: When the lubricator is working normally, high-pressure oil enters the valve chamber through the inlet 2. At this time, the oil pressure acts on the first sealing ring 531 side of the pressure limiting block 53, while the spring 521 and hydraulic rod 52 apply a supporting force in the opposite direction to the valve core 54. When the oil pressure is less than the threshold set by the spring 521 and hydraulic rod 52, the valve core 54 remains in the initial position, and the outlet 3 is closed. The high-pressure oil cannot be discharged through the outlet 3 and will be used entirely for the oil injection operation. When the pressure in the oil injection system rises and exceeds the threshold set by the spring 521 and hydraulic rod 52, the thrust of the oil on the pressure limiting block 53 is greater than the supporting force of the spring 521 and hydraulic rod 52, and the valve core 54 begins to move closer to the pressure limiting block 53. The direction of the drain port 3 moves; during the movement of the valve core 54, high-pressure oil will also enter the annular balance chamber 533 through the first branch pipe 542, the main pipe 541 and the second branch pipe 543 inside the valve core 54, and act evenly on the outer periphery of the pressure limiting block 53; this uniform radial force further offsets the unbalanced force that the valve core 54 may be subjected to. As the valve core 54 moves, the channel between the oil inlet 2 and the drain port 3 gradually opens, and some high-pressure oil is discharged through the drain port 3, thereby reducing the pressure of the oil injection system; when the system pressure drops below the threshold set by the spring 521 and the hydraulic rod 52, the spring 521 pushes the valve core 54 to reset again, closes the channel between the oil inlet 2 and the drain port 3, and stops the oil discharge.

[0034] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A pressure relief valve for an oil injector, comprising a valve body (1), characterized in that: The valve housing (1) is a hollow cavity. An oil inlet (2) is provided on the upper surface of one end of the valve housing (1), and an oil outlet (3) is provided on the lower surface of the other end of the valve housing (1). Two sliding grooves (4) are symmetrically provided at both ends of the cavity of the valve housing (1). A guide assembly (5) is slidably connected to the sliding groove (4) of the valve housing (1). The guide assembly (5) includes a valve core (54) and a hydraulic rod (52). The valve core (54) is cylindrical and located at the center of the valve housing (1) cavity. Two guide blocks (51) are fixedly connected to both sides of the valve core (54). The surface of each guide block (51) is provided with a slider (511) that is slidably connected to the slide groove (4). A pressure limiting block (53) is fixedly installed on the surface of the valve core (54). The hydraulic rod (52) is fixedly installed on the inner wall of the valve housing (1). The support end of the hydraulic rod (52) is fixedly installed on the surface of the guide block (51) on the side near the oil drain port (3).

2. The pressure relief valve for an oil injector according to claim 1, characterized in that: The slider (511) has three or more openings at equal intervals on its surface. Each opening of the slider (511) is rotatably connected to a ball (512), and the ball (512) is rotatably connected to the groove (4).

3. A pressure relief valve for an oil injector according to claim 1, characterized in that: The pressure limiting block (53) has a first sealing ring (531) fixedly installed on the side near the oil inlet (2), and the first sealing ring (531) is sleeved on the surface of the valve core (54).

4. A pressure relief valve for an oil injector according to claim 1, characterized in that: The pressure limiting block (53) has an annular balance cavity (533) at its end, and two second sealing rings (532) are symmetrically installed on both sides of the annular balance cavity (533).

5. A pressure relief valve for an oil injector according to claim 1, characterized in that: The valve core (54) has a main pipe (541) at its center. The main pipe (541) has a first branch pipe (542) on the side near the oil inlet (2). One side of the first branch pipe (542) is connected to the main pipe (541), and the other side of the first branch pipe (542) is connected to the cavity inside the valve housing (1) near the oil inlet (2).

6. A pressure relief valve for an oil injector according to claim 5, characterized in that: The main pipe (541) is symmetrically provided with two second branch pipes (543) on the side away from the first branch pipe (542). One side of each second branch pipe (543) is connected to the main pipe (541), and one side of each second branch pipe (543) is connected to the annular balance cavity (533).

7. A pressure relief valve for an oil injector according to claim 1, characterized in that: A spring (521) is sleeved on the surface of the hydraulic rod (52). One end of the spring (521) is fixedly installed on the inner wall of the valve body (1), and the other end is fixedly installed on the surface of the guide block (51).

Images