Sliding flow valve of three-face supporting structure

Abstract

The utility model relates to a sliding flow valve of a three-face supporting structure, and belongs to the technical field of sliding flow valves. Comprising a shell, a mounting hole is formed in the shell, and a blanking cap is in threaded connection with an opening in the outer side of the mounting hole; a sliding valve is inserted into the mounting hole in a sliding mode, an outer side connecting groove is formed in one end of the outer side of the sliding valve, an inner side connecting groove is formed in one end of the inner side of the sliding valve, a circle of outer side connecting holes are formed in the side wall of the outer side connecting groove, and a circle of inner side connecting holes are formed in the side wall of the inner side connecting groove. Three circular ring protrusions are fixedly arranged on the outer side cylindrical surface of the sliding valve, the outer side cylindrical surfaces of the three circular ring protrusions are in sliding contact with the inner wall of the mounting hole, the three circular ring protrusions are a front guide support, an oil sealing support and a rear guide support in sequence, an outer side connecting hole is located between the front guide support and the oil sealing support, and an inner side connecting hole is located between the rear guide support and the oil sealing support. The inner side connecting hole is positioned between the oil sealing support and the rear guide support; the problems that an existing sliding flow valve is serious in abrasion and large in noise are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sliding flow valves, and in particular relates to a sliding flow valve with a three-sided support structure. Background Art

[0002] like Figure 1 As shown, the existing sliding flow valve will be provided with a guide support 23 and an oil sealing support 14, and the circular boss at the rear contacts the boss in the inner cavity of the housing 1 to play a limiting role. When the sliding valve opens and moves to the left, the oil sealing support 14 is partially in the empty position of the low-pressure oil channel and does not play a guiding support role. Only the front guide support 23 works. The high-pressure oil flows rapidly and in large quantities from the load chamber into the oil inlet chamber, causing a strong impact on the oil sealing support 14. The outer circle of the oil sealing support 14 will be severely worn. After the sliding valve returns to its original position, the wear causes the gap to change, and the oil leaks into the oil inlet chamber through the excessive gap, reducing the volumetric efficiency and generating flow noise from the leaked oil. Therefore, improving the reliability of the sliding valve of the oil pump has become a top priority, and product quality has been continuously improved. Utility Model Content

[0003] The utility model overcomes the shortcomings of the prior art and provides a sliding flow valve with a three-sided support structure, thereby solving the problems of severe wear and high noise of the current sliding flow valve.

[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0005] A sliding flow valve with a three-sided support structure comprises a shell, a cylindrical mounting hole with an opening at one end is provided on the shell, a plugging cover is screwed at the outer opening of the mounting hole; a cylindrical sliding valve is slidably inserted in the mounting hole, a cylindrical outer connecting groove is provided on the end face of the sliding valve close to the plugging cover, a cylindrical inner connecting groove is provided on the end face of the sliding valve away from the plugging cover, a circle of outer connecting holes in a circular array are provided on the side wall at the inner bottom end of the outer connecting groove, and a circle of inner connecting holes in a circular array are provided on the side wall at the inner bottom end of the inner connecting groove, three annular protrusions are fixedly provided on the outer cylindrical surface of the sliding valve, the outer cylindrical surfaces of the three annular protrusions are in sliding contact with the inner wall of the mounting hole, and the three annular protrusions are sequentially arranged as a front guide support, an oil sealing support, and a rear guide support along the direction from the outer side of the mounting hole to the inner side of the mounting hole, wherein the outer connecting hole is located between the front guide support and the oil sealing support, and the inner connecting hole is located between the oil sealing support and the rear guide support.

[0006] Furthermore, a sealing ring is arranged between the contact surface of the blocking cover and the shell, and a cylindrical groove is arranged on the inner side surface of the blocking cover.

[0007] Furthermore, an oil inlet hole is provided in the middle of the mounting hole, the oil inlet hole is connected to the oil inlet chamber inside the shell, and the oil inlet chamber is connected to the oil tank; a load hole is provided at the end of the mounting hole away from the plugging cover, the load hole is connected to the load chamber inside the shell, and the load chamber is always connected to the external load.

[0008] Furthermore, the outer end opening of the inner connecting groove is connected to the load cavity through the load hole.

[0009] Furthermore, annular grooves are respectively arranged in the middle of the outer cylindrical surfaces of the three annular protrusions.

[0010] Furthermore, a sliding valve spring is arranged inside the mounting hole, and the sliding valve spring is sleeved on the outer side of one end of the sliding valve close to the blocking cover, one end of the sliding valve spring is connected to the front guide support, and the other end of the sliding valve spring is connected to the blocking cover; when the sliding valve spring is in a free extension state, the end of the sliding valve away from the blocking cover abuts against the inner end of the mounting hole, the outer connecting hole on the sliding valve corresponds to the oil inlet hole on the shell, and the outer connecting groove of the sliding valve is connected to the oil inlet chamber through the outer connecting hole and the oil inlet hole.

[0011] Furthermore, a cone valve is slidably inserted into the outer connecting groove of the sliding valve. The cone valve includes a cylindrical section and a conical section. The axes of the cylindrical section and the conical section coincide with the axis of the sliding valve. The conical section of the cone valve is located on the side of the cylindrical section close to the valve seat.

[0012] Furthermore, a cone valve spring is sleeved on the outside of the cylindrical section of the cone valve, and the two ends of the cone valve spring are respectively connected to the cone section of the cone valve and the inner bottom surface of the outer connecting groove; when the cone valve spring is in a free extension state, the cone section of the cone valve is in close contact with the inner opening of the working hole, and the inner opening of the working hole is closed by the cone section of the cone valve.

[0013] Furthermore, the inner area of ​​the mounting hole between the plug cover and the valve seat is a pressure-changing chamber, and the pressure-changing chamber is connected to the load chamber through a connecting chamber. A damping device is arranged inside the connecting chamber.

[0014] Furthermore, the pressure transformation chamber is separated from the oil inlet chamber by the front guide support, and the oil inlet chamber is separated from the load chamber by the oil sealing support.

[0015] The beneficial effects of the utility model compared with the prior art are:

[0016] The utility model provides a sliding flow valve with a three-sided support structure. By improving the parts structure, under the same liquid flow impact, the moving parts tend to work smoothly, the adaptability to the load is improved, the oil chamber sealing effect is significantly improved, the oil pump performance test is stable, the production efficiency is high, the batch production qualification rate is greatly improved, the oil pump service life is extended, and the enterprise benefit growth is promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of an existing sliding flow valve;

[0019] Figure 2 It is a lateral structural schematic diagram of the utility model;

[0020] Figure 3 It is a schematic diagram of the lateral structure of the utility model when the slide valve and the cone valve are in a static state. In the figure, blue represents the low-pressure oil in the oil inlet chamber, and red represents the high-pressure oil in the load chamber and the pressure-changing chamber. Different colors represent different oil pressures.

[0021] Figure 4 It is a schematic diagram of the structure of the utility model when the slide valve and the cone valve are in a static state. In the figure, blue represents the low-pressure oil in the oil inlet chamber, and red represents the high-pressure oil in the load chamber and the pressure-changing chamber. Different colors represent different oil pressures.

[0022] Figure 5 It is a schematic diagram of the structure of the utility model when the cone valve is in a sliding state. In the figure, blue represents the low-pressure oil in the oil inlet chamber, pink represents the oil in the pressure-changing chamber, red represents the oil in the load chamber, and yellow represents the oil in the transition chamber. Different colors represent different oil pressures.

[0023] Figure 6 It is a schematic diagram of the lateral structure of the utility model when the slide valve and the cone valve are in the same direction sliding state. In the figure, blue represents the low-pressure oil in the oil inlet chamber, pink represents the oil in the pressure-changing chamber, red represents the oil in the load chamber, and yellow represents the oil in the transition chamber. Different colors represent different oil pressures.

[0024] Figure 7 It is a schematic diagram of the structure of the utility model when the slide valve and the cone valve are in a reverse sliding state. In the figure, the blue color represents the low-pressure oil in the oil inlet chamber, the pink color represents the oil in the load chamber, and the bright blue color represents the oil in the pressure-changing chamber. Different colors represent different oil pressures.

[0025] Figure 8 It is a schematic diagram of the lateral structure of the utility model when the slide valve is in a sliding state. In the figure, the blue color represents the low-pressure oil inside the oil inlet chamber, the pink color represents the oil inside the load chamber, and the bright blue color represents the oil inside the pressure-changing chamber. Different colors represent different oil pressures.

[0026] Among them, 1 is the shell, 2 is the mounting hole, 3 is the plugging cover, 4 is the oil inlet chamber, 5 is the load chamber, 6 is the sliding valve, 7 is the outer connecting groove, 8 is the inner connecting groove, 9 is the outer connecting hole, 10 is the inner connecting hole, 11 is the valve seat, 12 is the working hole, 13 is the front guide support, 14 is the oil sealing support, 15 is the rear guide support, 16 is the sliding valve spring, 17 is the cone valve, 18 is the cone valve spring, 19 is the variable pressure chamber, 20 is the connecting chamber, 21 is the damping device, and 22 is the transition chamber. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0028] like Figure 2 As shown, the utility model provides a sliding flow valve with a three-sided support structure, including a housing 1, a plug cover 3, a valve seat 11, a sliding valve 6, a sliding valve spring 16, a cone valve 17, a cone valve spring 18, a front guide support 13, an oil sealing support 14, and a rear guide support 15.

[0029] A cylindrical mounting hole 2 with an open end is provided on the housing 1, a plug cover 3 is screwed on the outer opening of the mounting hole 2, a sealing ring is provided between the contact surface of the plug cover 3 and the housing 1, and the sealing of the opening of the mounting hole 2 is ensured by the plug cover 3. A cylindrical groove is provided on the inner side of the plug cover 3.

[0030] An oil inlet hole is arranged in the middle of the mounting hole 2, and the oil inlet hole is connected with the oil inlet chamber 4 inside the shell 1, and the oil inlet chamber 4 is connected with the oil tank; a load hole is arranged at the end of the mounting hole 2 away from the plugging cover 3, and the load hole is connected with the load chamber 5 inside the shell 1, and the load chamber 5 is always connected with the external load.

[0031] A cylindrical sliding valve 6 is slidably inserted in the mounting hole 2. The sliding valve 6 is provided with a cylindrical outer connecting groove 7 on the end surface close to the plug cover 3, and a cylindrical inner connecting groove 8 is provided on the end surface away from the plug cover 3. The outer connecting groove 7 and the inner connecting groove 8 are both coincident with the axis of the sliding valve 6. A circle of outer connecting holes 9 in a circular array is provided on the side wall at the inner bottom end of the outer connecting groove 7. The outer connecting groove 7 is connected to the outer side of the sliding valve 6 through a circle of outer connecting holes 9. A circle of inner connecting holes 10 in a circular array is provided on the side wall at the inner bottom end of the inner connecting groove 8. The inner connecting groove 8 is connected to the outer side of the sliding valve 6 through a circle of inner connecting holes 10. The outer end opening of the inner connecting groove 8 is connected to the load chamber 5 through a load hole.

[0032] A valve seat 11 is screwed on the outer opening of the outer connecting groove 7, and an effective hole 12 with two ends connected is arranged at the axis of the valve seat 11. The inner end of the effective hole 12 is connected to the inside of the outer connecting groove 7, and the inner end opening of the effective hole 12 is a trumpet-shaped structure with a thin inside and a thick outside.

[0033] Three annular protrusions are fixedly arranged on the outer cylindrical surface of the slide valve 6. The outer cylindrical surfaces of the three annular protrusions are in sliding contact with the inner wall of the mounting hole 2. The middle of the outer cylindrical surfaces of the three annular protrusions are respectively provided with annular grooves, which can evenly distribute the pressure of the entire circumference of the slide valve 6 and reduce the influence of the hydraulic clamping force on the annular protrusion area. The three annular protrusions are arranged in the direction from the outer side of the mounting hole 2 to the inner side of the mounting hole 2, which are the front guide support 13, the oil sealing support 14, and the rear guide support 15, respectively. The outer connecting hole 9 is located between the front guide support 13 and the oil sealing support 14, and the inner connecting hole 10 is located between the oil sealing support 14 and the rear guide support 15.

[0034] A slide valve spring 16 is arranged inside the mounting hole 2. The slide valve spring 16 is sleeved on the outer side of the end of the slide valve 6 close to the plug cover 3. One end of the slide valve spring 16 is connected to the front guide support 13, and the other end of the slide valve spring 16 is connected to the inner bottom surface of the cylindrical groove on the plug cover 3. When the slide valve spring 16 is in a free extension state, the end of the slide valve 6 away from the plug cover 3 abuts against the inner end of the mounting hole 2, the outer connecting hole 9 on the slide valve 6 corresponds to the oil inlet hole on the housing 1, and the outer connecting groove 7 of the slide valve 6 is connected to the oil inlet chamber 4 through the outer connecting hole 9 and the oil inlet hole.

[0035] A cone valve 17 is slidably inserted in the outer connecting groove 7 of the slide valve 6. The cone valve 17 includes a cylindrical section and a conical section. The axes of the cylindrical section and the conical section coincide with the axis of the slide valve 6. The conical section of the cone valve 17 is located on the side of the cylindrical section close to the valve seat 11. A cone valve spring 18 is sleeved on the outer side of the cylindrical section of the cone valve 17. The two ends of the cone valve spring 18 are respectively connected to the conical section of the cone valve 17 and the bottom surface of the inner side of the outer connecting groove 7. When the cone valve spring 18 is in a free extension state, the conical section of the cone valve 17 is in close contact with the inner opening of the operating hole 12, and the inner opening of the operating hole 12 is closed by the conical section of the cone valve 17.

[0036] The inner area of ​​the mounting hole 2 between the plug cover 3 and the valve seat 11 is a pressure changing chamber 19, and the pressure changing chamber 19 is connected to the load chamber 5 through a connecting chamber 20. A damping device 21 is arranged inside the connecting chamber 20.

[0037] The pressure-changing chamber 19 is separated from the oil inlet chamber 4 by the front guide support 13 , and the oil inlet chamber 4 is separated from the load chamber 5 by the oil sealing support 14 .

[0038] The working principle of the utility model is:

[0039] like Figure 3 As shown, when the slide valve 6 is in a stationary state, the slide valve spring 16 is in a free extension state, the end of the slide valve 6 away from the plug cover 3 is in contact with the inner end of the mounting hole 2, the outer connecting hole 9 on the slide valve 6 corresponds to the oil inlet hole on the housing 1, and the outer connecting groove 7 of the slide valve 6 is connected to the oil inlet chamber 4 through the outer connecting hole 9 and the oil inlet hole; at the same time, the cone valve spring 18 is in a free extension state, the cone section of the cone valve 17 is tightly connected to the inner end opening of the action hole 12, and the inner end opening of the action hole 12 is closed by the cone section of the cone valve 17. At this time, the oil inlet chamber 4 is connected to the outer connecting groove 7 inside the slide groove, the oil inlet chamber 4 is connected to the oil tank of the oil pump, and the oil inlet chamber 4 is always in a low pressure state during the operation of the oil pump; the load chamber 5 is always connected to the external load, and during the working process, the load changes at any time with the change of the working conditions, that is, the pressure inside the load chamber 5 also changes at any time with the change of the load. When the pressure inside the load chamber 5 is relatively low, the pressure inside the load chamber 5 is smaller than the resilience of the slide valve spring 16 , so that the sliding position remains stationary.

[0040] like Figure 4 As shown, when the slide valve 6 is in a stationary state, from another perspective, a damping device 21 is provided inside the connecting chamber 20 between the load chamber 5 and the variable pressure chamber 19. When the damping device 21 is in a static hydraulic oil, the pressures on both sides of the damping device 21 are completely consistent, that is, the pressure inside the variable pressure chamber 19 is consistent with the pressure inside the load chamber 5. The rebound force of the slide valve spring 16 inside the variable pressure chamber 19 makes the end of the slide valve 6 away from the plug cover 3 completely abut against the inner end of the mounting hole 2. At the same time, the cone valve 17 provided inside the slide valve 6 closes the inner end opening of the action hole 12 under the rebound force of the cone valve spring 18. The two sides of the cone valve 17 are the oil inlet chamber 4 and the pressure-changing chamber 19 respectively. At this time, the pressure inside the pressure-changing chamber 19 is consistent with the pressure inside the load chamber 5, and the initial pressure inside the load chamber 5 is small, which is not enough to overcome the rebound force of the cone valve spring 18, so that the cone valve 17 is in a stationary state. At this time, the slide valve 6 and the cone valve 17 do not slide, and the oil between the load chamber 5, the oil inlet chamber 4 and the pressure-changing chamber 19 does not flow.

[0041] like Figure 5As shown, when the external load increases, the pressure inside the load chamber 5 increases, and the pressure inside the pressure-changing chamber 19 also increases. When the pressure inside the pressure-changing chamber 19 is sufficient to overcome the rebound force of the cone valve spring 18, the cone valve 17 moves toward the side away from the valve seat 11, so that the cone section of the cone valve 17 is separated from the inner opening of the action hole 12 of the valve seat 11. The cone valve 17 is opened under the action of the high-pressure oil, and the oil begins to flow between the load chamber, the oil inlet chamber 4, and the pressure-changing chamber 19. When the flowing oil passes through the damping device 21, the pressure decreases, and the pressure inside the load chamber 5 is still increasing. After the pressure is reduced, the pressure of the pressure-changing chamber 19 is still sufficient to open the cone valve 17, and a transition chamber 22 appears near the cone surface of the cone section of the cone valve 17.

[0042] like Figure 6 As shown, when the flowing oil reaches the pressure-changing chamber 19 after passing through the damping device 21, the pressure inside the pressure-changing chamber 19 decreases, and the pressure inside the load chamber 5 increases at this time. The increased pressure overcomes the combined force of the pressure inside the pressure-changing chamber 19 and the slide valve spring 16, pushing the slide valve 6 to move toward the side of the plug cover 3. The outer cylindrical surface of the front guide support 13 of the slide valve 6 and the inner surface of the mounting hole 2 maintain stable contact during the sliding process, and the guiding effect is good. The hydraulic shock caused by the sudden change in pressure of the hydraulic oil has little effect on this place. At this time, the sealing oil support 14 has completely entered the oil inlet chamber 4, and the outer cylindrical surface of the sealing oil support 14 is completely separated from the inner cylindrical surface of the mounting hole 2. When the high-pressure oil enters the low-pressure area of ​​the oil inlet chamber 4, a transition chamber 22 with a sudden change in pressure is formed. The flow rate inside the transition chamber 22 is large, and the hydraulic shock and cavitation are very serious, which causes great damage to the sealing oil support 14. The rear guide support 15 of the slide valve 6 maintains stable contact with the inner side of the mounting hole 2 during the sliding process, the movement state is good, and it is far away from the direction where the oil flow changes suddenly. The impact of the oil pressure has little effect on the rear guide support 15. The entire slide valve 6 moves smoothly under the support of the front guide support 13 and the rear guide support 15. If there is no rear guide support 15, the slide valve 6 is prone to cone vibration, causing mechanical imbalance and noise, thereby causing the oil sealing support 14 to wear, and then causing fatigue failure of the slide valve 6.

[0043] like Figure 7 As shown, when the external load becomes smaller, the pressure inside the load chamber 5 decreases, and the pressure inside the variable pressure chamber 19 decreases faster due to the action of the damping device 21. The pressure inside the variable pressure chamber 19 is not enough to push the cone valve 17 to open. The cone valve spring 18 moves the cone valve 17 toward the side of the valve seat 11, so that the working hole 12 inside the valve seat 11 is closed, and the oil inlet chamber 4 is separated from the variable pressure chamber 19.

[0044] like Figure 8As shown, when the external load decreases rapidly, the pressure inside the load chamber 5 decreases rapidly in a short time, and the pressure inside the transformer chamber 19 also decreases. At this time, the pressure of the load chamber 5 acting on the slide valve 6 decreases, and the slide valve spring 16 starts to work. The slide valve spring 16 pushes the slide valve 6 to move toward the side away from the plug cover 3. In this process, the front guide support 13 becomes the rear guide, and the rear guide support 15 becomes the front guide. Together, the slide valve 6 moves smoothly toward the side away from the plug cover 3, and the oil sealing support 14 returns to its position smoothly. The oil sealing support 14 isolates the channel between the load chamber 5 and the oil inlet chamber 4.

[0045] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A sliding flow valve with a three-sided support structure, characterized in that: The invention comprises a housing (1), a cylindrical mounting hole (2) with an opening at one end being provided on the housing (1), a plug cover (3) being screwed on the outer opening of the mounting hole (2); a cylindrical sliding valve (6) being slidably inserted in the mounting hole (2), a cylindrical outer connecting groove (7) being provided on the end surface of the sliding valve (6) on the side close to the plug cover (3), a cylindrical inner connecting groove (8) being provided on the end surface of the sliding valve (6) on the side away from the plug cover (3), a circle of outer connecting holes (9) being provided on the side wall at the inner bottom end of the outer connecting groove (7), and a cylindrical inner connecting groove (8) being provided on the inner side of the inner connecting groove (8). A circle of inner connecting holes (10) in a circular array is arranged on the side wall of the bottom end. Three annular protrusions are fixedly arranged on the outer cylindrical surface of the slide valve (6). The outer cylindrical surfaces of the three annular protrusions are in sliding contact with the inner wall of the mounting hole (2). The three annular protrusions are arranged in sequence from the outer side of the mounting hole (2) to the inner side of the mounting hole (2), namely, a front guide support (13), an oil sealing support (14), and a rear guide support (15). The outer connecting hole (9) is located between the front guide support (13) and the oil sealing support (14), and the inner connecting hole (10) is located between the oil sealing support (14) and the rear guide support (15).

2. A sliding flow valve with a three-sided support structure according to claim 1, characterized in that: A sealing ring is provided between the contact surfaces of the plugging cover (3) and the housing (1), and a cylindrical groove is provided on the inner side surface of the plugging cover (3).

3. The sliding flow valve with a three-sided support structure according to claim 1, characterized in that: An oil inlet hole is provided in the middle of the mounting hole (2), the oil inlet hole is connected to an oil inlet chamber (4) inside the housing (1), and the oil inlet chamber (4) is connected to an oil tank; a load hole is provided at one end of the mounting hole (2) away from the plugging cover (3), the load hole is connected to a load chamber (5) inside the housing (1), and the load chamber (5) is always connected to an external load.

4. The sliding flow valve with a three-sided support structure according to claim 3, characterized in that: The outer end opening of the inner connecting groove (8) is connected to the load cavity (5) through the load hole.

5. The sliding flow valve with a three-sided support structure according to claim 1, characterized in that: Annular grooves are respectively arranged in the middle of the outer cylindrical surfaces of the three annular protrusions.

6. The sliding flow valve with a three-sided support structure according to claim 3, characterized in that: A slide valve spring (16) is arranged inside the mounting hole (2). The slide valve spring (16) is sleeved on the outer side of one end of the slide valve (6) close to the plug cover (3). One end of the slide valve spring (16) is connected to the front guide support (13), and the other end of the slide valve spring (16) is connected to the plug cover (3). When the slide valve spring (16) is in a free extension state, the end of the slide valve (6) away from the plug cover (3) abuts against the inner end of the mounting hole (2), the outer connecting hole (9) on the slide valve (6) corresponds to the oil inlet hole on the housing (1), and the outer connecting groove (7) of the slide valve (6) is connected to the oil inlet chamber (4) through the outer connecting hole (9) and the oil inlet hole.

7. The sliding flow valve with a three-sided support structure according to claim 1, characterized in that: A cone valve (17) is slidably inserted into the outer connecting groove (7) of the slide valve (6). The cone valve (17) comprises a cylindrical section and a conical section. The axes of the cylindrical section and the conical section coincide with the axis of the slide valve (6). The conical section of the cone valve (17) is located on a side of the cylindrical section close to the valve seat (11).

8. The sliding flow valve with a three-sided support structure according to claim 7, characterized in that: A cone valve spring (18) is sleeved on the outer side of the cylindrical section of the cone valve (17), and the two ends of the cone valve spring (18) are respectively connected to the cone section of the cone valve (17) and the inner bottom surface of the outer connecting groove (7); when the cone valve spring (18) is in a free extension state, the cone section of the cone valve (17) is in close contact with the inner opening of the working hole (12), and the inner opening of the working hole (12) is closed by the cone section of the cone valve (17).

9. The sliding flow valve with a three-sided support structure according to claim 3, characterized in that: The inner area of ​​the mounting hole (2) between the plug cover (3) and the valve seat (11) is a pressure-changing chamber (19), and the pressure-changing chamber (19) is connected to the load chamber (5) via a connecting chamber (20); a damping device (21) is provided inside the connecting chamber (20).

10. The sliding flow valve with a three-sided support structure according to claim 3, characterized in that: The pressure-changing chamber (19) is separated from the oil inlet chamber (4) by the front guide support (13), and the oil inlet chamber (4) is separated from the load chamber (5) by the oil sealing support (14).

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