Safety valve for internal gear pump

Abstract

A safety valve for an internal gear pump comprises a valve body, a valve element is arranged in the valve body, a valve cover is arranged at the end, corresponding to the valve element, of the valve body, an oil discharge channel is formed between the valve cover and the valve element, the valve element is used for communicating or blocking the oil discharge channel from being connected with an oil way in the gear pump, and an adjusting seat is arranged on the side, corresponding to the valve element, of the valve cover. A first supporting column and a second supporting column are arranged on the side, facing the valve element, of the adjusting base in the direction from the center to the outer edge, and a first positioning groove and a second positioning groove are formed in the side, facing the adjusting base, of the valve element in the direction from the center to the outer edge. The first supporting column is sleeved with a first positioning spring, and one end of the first positioning spring abuts against the groove bottom of the first positioning groove. The second supporting column is sleeved with a second positioning spring, and one end of the second positioning spring abuts against the groove bottom of the second positioning groove. The utility model has the beneficial effects that the first supporting column and the second supporting column are respectively sleeved with the first positioning spring and the second positioning spring, so that the dual positioning of the position of the valve core is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a safety valve, especially a safety valve for internal meshing gear pump. BACKGROUND

[0002] The safety valve of the internal meshing gear pump is a protection device, mainly used for preventing the pump from being damaged under abnormal conditions, such as excessive pressure. It is usually installed on the outlet pipeline of the pump and works by sensing the pressure change of the pump output. When the pressure of the pump exceeds the set safety threshold, the safety valve will automatically open to release part of the pressure, thereby protecting the gear pump and the entire hydraulic system from damage. The design of this valve can quickly respond to the surge of pressure, ensuring the safe and stable operation of the system, and when the pressure decreases to the normal working range, the safety valve will close again, allowing the pump to resume normal operation.

[0003] If the safety valve core, as a key component, is not accurately positioned, the valve may not correctly respond to changes in system pressure, making it unable to open or close at the predetermined pressure point. This can lead to a failure in system pressure control, causing the equipment to be subjected to excessively high or low pressure, thereby increasing the risk of equipment damage and accidents. At the same time, this can also cause energy waste, as the pump may need to work excessively under non-optimal pressure, and increase maintenance costs, as frequent pressure fluctuations and improper operation can accelerate the wear of the valve and related components. In addition, the risk of oil leakage will also increase, as inaccurate positioning of the valve core can lead to poor sealing, affecting the stability and safety of the entire system. SUMMARY

[0004] To overcome the shortcomings of the prior art, the utility model provides a safety valve for internal meshing gear pump with more accurate positioning.

[0005] To achieve the above-mentioned purpose, the utility model technical scheme is as follows: a safety valve for internal meshing gear pump, comprising a valve body, a valve core is arranged in the valve body, a valve cover is arranged at one end of the valve body corresponding to the valve core, an oil discharge channel is formed between the valve cover and the valve core, the valve core is used to connect or block the oil discharge channel and the oil path inside the gear pump, an adjusting seat is arranged on one side of the valve cover corresponding to the valve core, first and second support columns are respectively arranged on one side of the adjusting seat facing the valve core from the center to the outer direction, and the first support column protrudes from the second support column, first and second positioning grooves are respectively arranged on one side of the valve core facing the adjusting seat from the center to the outer direction, and the groove depth of the first positioning groove is greater than that of the second positioning groove, the inner diameter of the first positioning groove and the outer diameter of the second support column are on the same straight line, a first positioning spring is sleeved on the first support column, and one end of the first positioning spring abuts against the groove bottom of the first positioning groove, and a second positioning spring is sleeved on the second support column, and one end of the second positioning spring abuts against the groove bottom of the second positioning groove.

[0006] The beneficial effects of the utility model are: the design of the internal gear pump safety valve sets the adjusting seat on the valve cover, sets the first and second support columns on the adjusting seat respectively, sets the first and second positioning grooves on the valve core correspondingly, and sets the first and second positioning springs on the two support columns respectively, which realizes the double positioning of the valve core position. The design of the two positioning springs can effectively prevent the valve core from deviating under high pressure or impact load, ensure that the valve core always remains in the correct position, and thus ensure the accurate connection or blocking of the oil discharge channel and the internal oil circuit of the gear pump. This accurate positioning mechanism not only improves the response speed and reliability of the safety valve, but also enhances its long-term stability, reduces the risk of oil circuit leakage or pressure control failure caused by the deviation of the valve core, and thus improves the safety and working efficiency of the entire hydraulic system. At the same time, this design also helps to reduce maintenance requirements and prolong the service life of the valve, providing more reliable protection for the internal gear pump.

[0007] As a preferred way, the spring sleeved on the second support column is thicker than the spring sleeved on the first support column, and the first positioning spring and the second positioning spring are radially abutted, so as to provide support for the first positioning spring in the radial direction by the second positioning spring while minimizing the outer diameter of the first positioning groove.

[0008] Further, the valve cover is provided with an adjusting bolt, one end of the adjusting bolt is connected with the adjusting seat, and the adjusting bolt is used for adjusting the distance between the adjusting seat and the valve core when rotating.

[0009] In the design of the internal gear pump safety valve, the adjusting bolt provided on the valve cover allows users to adjust the distance between the adjusting seat and the valve core by rotating the bolt. This design provides a simple adjustment mechanism, allowing operators to accurately control the position of the valve core according to the specific needs and working conditions of the system, and thus adjust the opening pressure of the safety valve. This adjustability enhances the flexibility and adaptability of the safety valve, allowing it to adapt to different working pressures and system configurations, ensuring reliable overpressure protection under various operating conditions. In addition, the center line of the adjusting bolt can coincide with the center line of the adjusting seat to prevent the first and second positioning springs from radially deviating during the adjustment process. At the same time, this design also simplifies the maintenance and calibration process, as the safety valve settings can be quickly adjusted on site without the need to replace parts or perform complex calibration procedures, thereby reducing maintenance costs and improving system efficiency. In addition, the design of the adjusting bolt also helps to achieve more precise pressure control, reducing system failures or performance degradation caused by improper pressure settings, ensuring the stability and safety of the hydraulic system.

[0010] Further, the oil discharge channel is provided with an opening and closing channel for the valve core to move in, and the end of the opening and closing channel connected to the oil discharge channel is provided with a guide slope.

[0011] In the design of the internal gear pump safety valve, the end of the opening and closing channel connected to the oil discharge channel is provided with a guide slope, and the outer diameter of the end of the guide slope close to the end of the adjusting seat is larger than the outer diameter of the rest of the valve core. This design allows the inclined guide slope to act as a buffer damper when the valve core is opened under the action of the oil circuit, effectively slowing down the movement speed of the valve core, preventing the valve core from directly impacting the valve body due to the sudden impact of the oil flow, thereby avoiding the risk of damage or premature wear of the valve core. In addition, this inclined guide slope design also helps to smoothly guide the oil flow, reducing the impact force of the oil flow on the valve core, reducing noise, and improving the sealing performance of the valve. At the same time, the larger outer diameter design enhances the stability of the valve core, allowing it to maintain good positioning in a high-pressure environment, ensuring the reliability and durability of the safety valve, extending the service life of the valve, and improving the safety and stability of the entire hydraulic system.

[0012] Further, the end of the guide slope away from the adjusting seat is provided with a force applying groove, and the outer diameter of the groove bottom is smaller than the outer diameter of the rest of the valve core.

[0013] In the design of the internal gear pump safety valve, the end of the guide slope away from the adjusting seat is provided with a force applying groove, and the outer diameter of the groove bottom is smaller than the outer diameter of the rest of the valve core. This design allows the force applying groove to act as an oil storage space after the valve core is opened, acting as a damper to help slow down the closing speed of the valve core and reduce the direct impact of the valve core on the valve body caused by sudden changes in oil flow pressure. In combination with the inclined guide slope, the force applying groove further reduces the risk of the valve core impacting the valve body, thereby protecting the valve core and valve body and extending the service life of the valve. In addition, the design of the force applying groove also helps to more smoothly control the oil flow, reduce the noise generated by the oil flow impact, and improve the stability and safety of the system. This careful design consideration not only enhances the durability and reliability of the safety valve, but also improves the efficiency and performance of the entire hydraulic system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is the axial view of the embodiment of the utility model;

[0015] Fig. 2 is the axial view of the safety valve part of the embodiment of the utility model;

[0016] Fig. 3 is the sectional view of the safety valve of the embodiment of the utility model. DETAILED DESCRIPTION

[0017] The utility model discloses an embodiment of a kind of safety valve for internal meshing gear pump as shown in Figs. 1-3 As shown: including valve body 1, two ends in valve body 1 respectively correspond valve core 2 and valve cover 3, and its both sides form oil discharge passage 4.

[0018] Adjusting seat 5 is arranged in oil discharge passage 4 and correspondingly arranged on valve core 2 on the side of valve cover 3, the end of adjusting seat 5 away from valve core 2 is provided with adjusting bolt 54 for adjusting the distance between adjusting seat 5 and valve core 2, and the center line of adjusting bolt 54 overlaps the center line of adjusting seat 5.Adjusting seat 5 includes support ring 53 abutting on valve cover 3, the second support column 52 with second positioning spring 7 sleeved thereon is protrusely arranged on support ring 53 towards valve core 2 direction, the first support column 51 with first positioning spring 6 sleeved thereon is protrusely arranged on the end face of second support column 52 close to valve core 2 side, and first positioning groove 23 for placing first positioning spring 6 and abutting on the outer diameter surface of first positioning spring 6 and second positioning groove 24 for placing second positioning spring 6 and abutting on the outer diameter surface of second positioning spring 7 are arranged on valve core 2, second positioning groove 24 is annular groove and its outer diameter is greater than first positioning groove 23, and the inner diameter surface of first positioning groove 23 is a horizontal straight line after being connected with the outer diameter of second support column 52.

[0019] In the embodiment, the extension distance of second support column 52 towards valve core 2 direction is greater than the extension distance of first support column 51 towards valve core 2 direction, so the thickness of second positioning spring 7 is greater than the thickness of first positioning spring 6, which can effectively prevent the radial deviation of itself and first positioning spring 6.In addition, as a preferred mode, since one end of second positioning spring 7 abuts on support ring 53, annular baffle (not shown in the figure) is arranged on support ring 53 extending towards valve core 2 direction, the annular baffle (not shown in the figure) and second support column 52 abut on both ends of the outer diameter surface of second positioning spring 7, that is, the fixed groove (not shown in the figure) for placing second positioning spring 7 is formed between annular baffle (not shown in the figure) and second support column 52;at the same time, second positioning spring 7 can be fixed in the groove bottom of fixed groove (not shown in the figure) by welding or other methods, so that second positioning spring 7 will not deviate and provide good radial support for first positioning spring 6.

[0020] Opening and closing channel 41 for the movement of valve core 2 is arranged in oil discharge passage 4, and the end of valve core 2 corresponding to opening and closing channel 41 and oil discharge passage 4 is arranged with guide slope 21, the outer diameter of the end of guide slope 21 close to adjusting seat 5 side is greater than the outer diameter of the rest of valve core 2, and the other end is provided with force applying groove 22, and the outer diameter of groove bottom of force applying groove 22 is smaller than the outer diameter of the rest of valve core 2.

[0021] The use process of the embodiment is as follows: when the internal pressure of the gear pump is too large to move the valve core 2, the internal pressure of the gear pump is released by being communicated with the oil discharge channel 4, and when the valve core 2 moves towards the closing direction, the guiding slope 22 and the force applying groove 22 cooperate to resist the torque applied to the valve core 2 by the first positioning spring 6 and the second positioning spring 7, so that the valve core 2 is moved towards the internal direction of the opening and closing channel 41, thereby effectively avoiding the damage caused by the impact of the valve core 2 on the valve body 1 when the valve core 2 is opened and closed, and the service life is increased. In addition, the two positioning springs and the two positioning grooves cooperate to provide effective guiding force for the valve core 2, so as to prevent the valve core 2 from being offset and then impacting on the valve body 1.

[0022] The above embodiment is only one of the preferred specific embodiments of the present application, and the usual changes and replacements made by those skilled in the art within the technical scheme of the present application are all included in the protection scope of the present application.

Claims

1. A safety valve for an internal gear pump, comprising a valve body, a valve core disposed within the valve body, a valve cover disposed at one end of the valve body corresponding to the valve core, an oil discharge passage formed between the valve cover and the valve core, the valve core being used to connect or block the oil discharge passage from the oil circuit inside the gear pump, characterized in that: An adjusting seat is provided on the valve cover on the side corresponding to the valve core, and a first support column and a second support column are respectively provided on the adjusting seat facing the valve core from the center toward the outer edge, and the first support column protrudes from the second support column. A first positioning groove and a second positioning groove are respectively provided on the side of the valve core facing the adjusting seat from the center toward the outer edge, and the groove depth of the first positioning groove is greater than the groove depth of the second positioning groove. The inner diameter of the first positioning groove and the outer diameter of the second support column are in the same straight line, the first support column is provided with a first positioning spring and one end of which rests on the bottom of the first positioning groove, and the second support column is provided with a second positioning spring and one end of which rests on the bottom of the second positioning groove.

2. The safety valve for an internal gear pump according to claim 1, characterized in that: The valve cover is provided with an adjusting bolt, one end of which is connected to the adjusting seat. When the adjusting bolt is rotated, it is used to adjust the distance between the adjusting seat and the valve core.

3. The safety valve for an internal gear pump according to claim 2, characterized in that: The oil unloading channel is provided with an opening and closing channel for the valve core to move therein, and a guide slope is inclinedly provided at one end of the valve core corresponding to the opening and closing channel connected to the oil unloading channel. The outer diameter of the end of the guide slope close to the adjustment seat is larger than the outer diameter of the rest of the valve core.

4. The safety valve for an internal gear pump according to claim 3, characterized in that: A force-applying groove is provided at the end of the guiding inclined surface away from the adjusting seat, and the outer diameter of the bottom of the force-applying groove is smaller than the outer diameter of the rest of the valve core.

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