A speed regulating valve with dual regulating functions of pressure reduction and throttling

Abstract

The present invention discloses a speed regulating valve with dual regulating functions of pressure reduction and throttling, belonging to the technical field of speed regulating valves. A chamber a and a chamber b are arranged in the valve body, a valve core a is slidably connected to the inner wall of chamber a and divides chamber a into an action chamber a and an action chamber b, two ends of a spring a4 are respectively connected to the inner wall of action chamber a and valve core a, and valve core b is slidably connected to the inner wall of chamber b. The beneficial effects of the present invention are as follows: a triangular groove type throttle port made of shape memory alloy is adopted, and the leakage increases due to the increase of oil temperature, and the shape memory alloy deforms with the temperature, so that the triangular groove increases, and the leakage is compensated, thereby stabilizing the output flow; a polyvinyl chloride core is adopted, and when the oil temperature increases, the length of the polyvinyl chloride core increases, pushing the valve core c to move right, increasing the valve port flow, and vice versa, reducing it, thereby changing the oil inlet flow according to the temperature change.

Description

Technical Field

[0001] The invention relates to a speed regulating valve with dual regulating functions of pressure reducing and throttling, belonging to the technical field of speed regulating valves. Background Art

[0002] According to the principle of the differential speed regulating valve, the speed regulating valve is a combination valve composed of a differential pressure reducing valve and a throttle valve in series. The throttle valve is used to adjust the flow rate, and the differential pressure reducing valve automatically compensates for the influence of load changes, so that the pressure difference before and after the throttle valve remains unchanged, eliminating the influence of load changes on the flow rate. The pressure before and after the throttle valve is respectively led to the two ends of the differential pressure reducing valve, and the hydraulic driving force generated by the pressure difference and the difference between the spring force and the hydraulic force are balanced, that is, the hydraulic driving force generated by the pressure difference is equal to the spring force minus the hydraulic force. When the load pressure increases, the hydraulic pressure acting on the left end of the valve core of the pressure reducing valve increases, the valve core moves to the right, the pressure reducing port increases, and the pressure drop decreases, so that the pressure difference of the throttle valve remains unchanged, and vice versa, so that the flow rate of the speed regulating valve is constant. With the advancement and iteration of technology, such as robot hydraulic systems, robot hands on production lines, low-speed stable logistics handling positioning systems and other places with high requirements for positioning accuracy and stability, the flow stability requirements of the speed regulating valve are also increasing. Faults in existing speed control valves include flow regulation failure, unstable flow, increased internal leakage, etc. Among them, increased oil temperature is one of the reasons for unstable flow. Studies have shown that when using speed control valves for speed regulation, they are generally affected by oil temperature. When the hydraulic oil temperature increases due to work, it often causes increased leakage of the throttle valve. When the leakage increases, the output flow will decrease. When the total output flow is small, it will further cause the output flow of the speed control valve to be unstable. In situations where high speed control accuracy is required, such as fully automatic robots, large factory machinery and equipment, plastic packaging machinery, etc., the performance of existing speed control valves cannot meet their requirements. Summary of the invention

[0003] In order to solve the defects of the prior art, the purpose of the present invention is to provide a speed regulating valve which can adapt to temperature changes and has high stability and has dual regulating functions of pressure reduction and throttling.

[0004] The technical scheme of the present invention is: a speed regulating valve with dual regulating functions of pressure reduction and throttling, wherein a chamber a and a chamber b are arranged in a valve body, a valve core a is slidably connected to the inner wall of chamber a and divides chamber a into an action chamber a and an action chamber b, two ends of a spring a4 are respectively connected to the inner wall of action chamber a and valve core a, valve core b is slidably connected to the inner wall of chamber b, valve core b comprises a polyvinyl chloride core in the middle and a metal core a and a metal core b connected to both sides of the polyvinyl chloride core, an end of metal core a is connected to valve core a, metal core b is connected to valve core c through a connecting rod, valve core c is slidably connected to chamber b, valve core c divides chamber b into an action chamber c and an oil delivery chamber a, an oil inlet is arranged above the oil delivery chamber a, and the oil delivery chamber The bottom of a is connected to a cross channel, the bottom of the cross channel is connected to chamber c, the two sides of the cross channel are connected to the action chamber b and the action chamber c, a valve core d is provided in the chamber c, the valve core d divides the chamber c into an oil delivery chamber b and an action chamber c, a triangular groove type throttle port is provided on the valve core d at the connection between the oil delivery chamber b and the cross channel, the triangular groove type throttle port is made of shape memory alloy material, the oil delivery chamber b22 is connected to the action chamber a through the oil delivery channel a, the oil delivery chamber b is connected to the action chamber c through the oil delivery channel b, the two ends of the spring b are respectively connected to the inner wall of the oil delivery chamber b and the valve core d, an oil outlet is provided at the bottom of the oil delivery chamber b, the adjusting handle passes through and is threadedly connected to the valve body, and the end of the adjusting handle is connected to the valve core d.

[0005] The oil outlet is connected to the hydraulic cylinder to drive the load.

[0006] The oil outlet is located at the bottom of the triangular groove valve port side.

[0007] The beneficial effects of the present invention are as follows: a triangular groove type throttle port made of shape memory alloy is adopted, and the leakage increases due to the increase of oil temperature. The shape memory alloy deforms with the temperature, so that the triangular groove increases, and the leakage is compensated, thereby stabilizing the output flow rate; a polyvinyl chloride core is adopted, and when the oil temperature increases, the length of the polyvinyl chloride core increases, pushing the valve core c to move right, increasing the valve port flow rate, and vice versa, reducing it, thereby changing the oil inlet flow rate according to the temperature change. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the present invention.

[0009] The reference numerals in the figure are as follows: 1. valve body, 2. oil delivery channel a, 3. working chamber a, 4. spring a, 5. oil delivery chamber a, 6. valve core a, 7. working chamber b, 8. polyvinyl chloride core, 9. oil inlet, 10. valve core c, 11. metal core a, 12. working chamber c, 13. cross channel, 14. triangular groove throttle port, 15. valve core d, 16. oil delivery channel b, 17. adjusting handle, 18. working chamber c, 19. oil outlet, 20. spring b, 21. metal core b, 22. oil delivery chamber b. DETAILED DESCRIPTION

[0010] The following is combined with Figure 1 The present invention is further described:

[0011] A speed regulating valve with dual regulating functions of pressure reduction and throttling, wherein a valve body 1 is provided with chamber a and chamber b, a valve core a6 is slidably connected to the inner wall of chamber a and divides chamber a into an action chamber a3 and an action chamber b7, two ends of a spring a4 are respectively connected to the inner wall of action chamber a3 and valve core a6, valve core b is slidably connected to the inner wall of chamber b, valve core b comprises a polyvinyl chloride core 8 in the middle and a metal core a11 and a metal core b21 connected to both sides of the polyvinyl chloride core 8, the end of metal core a11 is connected to valve core a6, metal core b21 is connected to valve core c10 through a connecting rod, valve core c10 is slidably connected to chamber b, valve core c10 divides chamber b into an action chamber c12 and an oil delivery chamber a5, an oil inlet 9 is provided above the oil delivery chamber a5, the bottom of the oil delivery chamber a5 is connected to a cross channel 13, the bottom of the cross channel 13 is connected to chamber c, and the two sides of the cross channel 13 are connected to The action chamber b7 and the action chamber c12 are connected, and a valve core d15 is provided in the chamber c. The valve core d15 divides the chamber c into an oil delivery chamber b22 and an action chamber c18. A triangular groove type throttle port 14 is provided on the valve core d15 at the connection between the oil delivery chamber b22 and the cross channel 13. The triangular groove type throttle port 14 is made of shape memory alloy material. The oil delivery chamber b22 is connected to the action chamber a3 through the oil delivery channel a2, and the oil delivery chamber b22 is connected to the action chamber c18 through the oil delivery channel b16. Both ends of the spring b20 are respectively connected to the inner wall of the oil delivery chamber b22 and the valve core d15. An oil outlet 19 is provided at the bottom of the oil delivery chamber b22. The oil outlet 19 is located at the bottom of the triangular groove valve port side. The oil outlet 19 is connected to the hydraulic cylinder to drive the load. The adjusting handle 17 passes through and is threadedly connected to the valve body 1, and the end of the adjusting handle 17 is connected to the valve core d15.

[0012] Working process of the present invention:

[0013] When the temperature of the hydraulic oil rises due to work, leakage increases, such as leakage from the threaded gap connecting the handle 17 and the valve body 1. The temperature reaches the deformation temperature of the shape memory alloy, and the groove of the triangular groove throttle port 14 of the oil outlet 19 of the valve core d15 increases, so that the amount of oil entering the oil delivery chamber b22 through the cross channel 13 increases, and the leakage is compensated. In order to meet the sufficient oil supply in the valve body 1, the middle part of the valve core b is designed as a polyvinyl chloride core 8, which will expand after heating and increase in length, pushing the valve core c10 to the right, so that the connecting gap between the oil inlet 9 and the oil delivery chamber a5 becomes larger, thereby increasing the flow of hydraulic oil entering the oil delivery chamber a5, and then increasing the flow entering the cross channel 13, ensuring that there is sufficient oil supply to the oil delivery chamber b22, so that leakage compensation can be carried out normally, stabilizing the flow of the oil outlet 19, and making the hydraulic cylinder connected thereto work stably.

[0014] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A working method of a speed regulating valve with dual regulating functions of pressure reduction and throttling, characterized in that: A chamber a and a chamber b are provided in a valve body (1). A valve core a (6) is slidably connected to the inner wall of chamber a and divides chamber a into an action chamber a (3) and an action chamber b (7). Two ends of a spring a (4) are respectively connected to the inner wall of the action chamber a (3) and the valve core a (6). The valve core b is slidably connected to the inner wall of chamber b. The valve core b includes a polyvinyl chloride core (8) in the middle and a metal core a (11) and a metal core b (21) connected to both sides of the polyvinyl chloride core (8). The end of the metal core a (11) is The metal core b (21) is connected to the valve core c (10) through a connecting rod. The valve core c (10) is slidably connected to the chamber b. The valve core c (10) divides the chamber b into an action chamber a (12) and an oil delivery chamber a (5). An oil inlet (9) is provided above the oil delivery chamber a (5). The bottom of the oil delivery chamber a (5) is connected to a cross channel (13). The bottom of the cross channel (13) is connected to the chamber c. Both sides of the cross channel (13) are connected to the action chamber b (7) and the action chamber a (12). 2), a valve core d (15) is provided in the chamber c, the valve core d (15) divides the chamber c into an oil delivery chamber b (22) and an action chamber c (18), a triangular groove type throttle port (14) is provided on the valve core d (15) at the connection between the oil delivery chamber b (22) and the cross channel (13), the triangular groove type throttle port (14) is made of shape memory alloy material, the oil delivery chamber b (22) is connected to the action chamber a (3) through the oil delivery channel a (2), and the oil delivery chamber b (22) is connected to the action chamber a (3) through the oil delivery channel a (2). The oil delivery channel b (16) is connected to the second action chamber c (18), and the two ends of the spring b (20) are respectively connected to the inner wall of the oil delivery chamber b (22) and the valve core d (15). The bottom of the oil delivery chamber b (22) is provided with an oil outlet (19). The adjustment handle (17) passes through and is threadedly connected to the valve body (1), and the end of the adjustment handle (17) is connected to the valve core d (15); the oil outlet (19) is connected to the hydraulic cylinder to drive the load; the oil outlet (19) is located at the bottom of the triangular groove type throttle port (14); When the temperature of the hydraulic oil rises due to operation, leakage increases and leaks from the threaded gap connecting the handle (17) and the valve body (1). When the temperature reaches the deformation temperature of the shape memory alloy, the groove of the triangular groove type throttle port (14) of the oil outlet (19) of the valve core d (15) increases, so that the amount of oil entering the oil delivery chamber b (22) through the cross channel (13) increases, and the leakage is compensated. In order to meet the sufficient oil supply in the valve body (1), the middle part of the valve core b is designed as a polyvinyl chloride core (8), which will expand after being heated and increase in length, pushing the valve core c (10) to move to the right, so that the connecting gap between the oil inlet (9) and the oil delivery chamber a (5) becomes larger, thereby increasing the flow of hydraulic oil entering the oil delivery chamber a (5), and then increasing the flow entering the cross channel (13), ensuring that sufficient oil is supplied to the oil delivery chamber b (22), so that leakage compensation can be carried out normally, stabilizing the flow of the oil outlet (19), and making the hydraulic cylinder connected thereto work stably.

Images