Two-stage speed control valve

Abstract

This utility model discloses a two-stage speed regulating valve, including a valve body. The valve body contains a pressure-reducing valve chamber for installing a pressure-reducing valve and a throttling valve chamber for installing a first throttling valve and a second throttling valve. The pressure-reducing valve and the first throttling valve are connected in series. The valve body also includes a solenoid valve, which is connected in parallel with the first throttling valve and then connected to the pressure-reducing valve. The solenoid valve is also connected in series with the second throttling valve. This utility model adjusts the flow rate entering the throttling valve through the first throttling valve and the pressure-reducing valve, ensuring a stable pressure difference between the inlet and outlet of the throttling valve. Furthermore, by using the solenoid valve and the second throttling valve connected in parallel with the first throttling valve, the flow rate can be diverted and adjusted when the pressure-reducing valve's adjustment range is overloaded, thereby meeting the oil flow rate requirements at the final outlet.

Description

Technical Field

[0001] This utility model relates to the field of speed control valve technology, specifically to a two-stage speed control valve. Background Technology

[0002] The speed control valve is a combination valve consisting of a differential pressure reducing valve and a throttle valve connected in series. The throttle valve regulates the flow rate, while the differential pressure reducing valve automatically compensates for load changes, keeping the pressure difference across the throttle valve constant and eliminating the impact of load variations on the flow rate. The pressures before and after the throttle valve are respectively directed to the right and left ends of the pressure reducing valve core. When the load pressure increases, the hydraulic pressure acting on the left end of the pressure reducing valve core increases, causing the valve core to move to the right, increasing the pressure reducing port size, and decreasing the pressure drop, thus keeping the pressure difference of the throttle valve constant; conversely, the same applies, ensuring that the flow rate of the speed control valve remains constant (unaffected by the load).

[0003] Existing speed control valves can only achieve single-stage speed regulation, and they rely on springs to adjust load changes. However, springs themselves have a certain pressure adjustment range. When the pressure adjustment range is exceeded, the speed control valve will be damaged, affecting the final performance. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a two-stage speed regulating valve to solve the problems mentioned in the background art and improve the regulation effect.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A two-stage speed control valve includes a valve body. Inside the valve body are a pressure-reducing valve chamber for installing a pressure-reducing valve and a throttling valve chamber for installing a first throttling valve and a second throttling valve. The pressure-reducing valve and the first throttling valve are connected in series. The valve body also has a solenoid valve, which is connected in parallel with the first throttling valve and then connected to the pressure-reducing valve. The solenoid valve and the second throttling valve are connected in series. The pressure-reducing valve has a first oil port connected to the oil inlet and a second oil port for oil discharge. The first throttling valve has a third oil port connected to the second oil port and a fourth oil port connected to the oil outlet. The solenoid valve's oil inlet is connected to the first oil port, and its oil outlet is connected to the second throttling valve's oil inlet. The second throttling valve's oil outlet is connected to the second oil outlet.

[0007] The aforementioned two-stage speed control valve includes a pressure reducing valve sleeve disposed within a pressure reducing valve cavity. A pressure reducing valve core is disposed inside the pressure reducing valve sleeve. An end cap is disposed at one end of the pressure reducing valve cavity, and a sealing plug is disposed at the other end to seal the pressure reducing valve cavity. A screw plug is disposed on the outside of the sealing plug. A second spring and a third spring are respectively disposed between the end cap and the end of the pressure reducing valve core, and the third spring sleeve is disposed on the outside of the second spring.

[0008] The above-mentioned two-stage speed control valve has the same structure for the first throttle valve and the second throttle valve. The first throttle valve includes a throttle valve sleeve disposed in the throttle valve cavity. A throttle valve core is rotatably installed inside the throttle valve sleeve. The throttle valve core is connected to an adjustment handle disposed on the valve body.

[0009] In the aforementioned two-stage speed control valve, the regulating handle is hollow inside, and a first spring is installed inside the regulating handle. The first spring is a torsion spring, with one end connected to the regulating handle and the other end connected to a spring seat installed inside the regulating handle.

[0010] The aforementioned two-stage speed control valve has a scale dial on the valve body around the adjusting handle.

[0011] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0012] This invention provides a two-stage speed control valve. It adjusts the flow rate entering the throttle valve through a first throttle valve and a pressure reducing valve, ensuring a stable pressure difference between the inlet and outlet of the throttle valve. Furthermore, by incorporating a solenoid valve and a second throttle valve connected in parallel with the first throttle valve, it can divert and regulate the flow rate when the pressure reducing valve's adjustment range is overloaded, thereby meeting the oil flow rate requirements at the final outlet. In addition, the throttle valve flow rate adjustment can be observed via a dial, allowing for precise flow rate control and improving adjustment accuracy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the specific structure of the present utility model;

[0014] Figure 2 This is a schematic diagram of the specific structure of the throttle valve described in this utility model;

[0015] Figure 3 This is a schematic diagram of the specific structure of the pressure reducing valve described in this utility model;

[0016] Figure 4 This is a schematic diagram illustrating the principle of this utility model.

[0017] The components are: 1. Valve body, 2. End cap, 3. Solenoid valve, 4. Protective plate, 5. Throttling valve sleeve, 6. Throttling valve core, 7. Adjusting handle, 8. First spring, 9. Spring seat, 10. Dial, 11. Pressure reducing valve sleeve, 12. Pressure reducing valve core, 13. Second spring, 14. Third spring, 15. Sealing plug, 16. Screw plug, 17. Pressure reducing valve, 18. First throttle valve, 19. Second throttle valve, P1. Oil inlet, P2. Oil outlet. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Two-stage speed control valve, such as Figures 1 to 4 As shown, the device includes a valve body 1. Inside the valve body 1, there are pressure reducing valve chambers for installing pressure reducing valve 17 and throttle valve chambers for installing first throttle valve 18 and second throttle valve 19. Pressure reducing valve 17 and first throttle valve 18 are connected in series. A solenoid valve 3 is also provided on the valve body 1. Solenoid valve 3 is connected in parallel with first throttle valve 18 and then connected to pressure reducing valve 17. Solenoid valve 3 and second throttle valve 19 are connected in series.

[0020] The first throttle valve 18 and the second throttle valve 19 have the same structure. Therefore, only the structure of the first throttle valve 18 is described in the specification. The first throttle valve 18 includes a throttle valve sleeve 5 disposed in the throttle valve cavity. A throttle valve core 6 is rotatably mounted inside the throttle valve sleeve 5. The throttle valve core 6 is connected to an adjusting handle 7 disposed on the valve body 1. The flow rate of the throttle valve is adjusted by rotating the throttle valve core 6 through the adjusting handle 7.

[0021] The adjusting handle 7 is hollow inside, and a first spring 8 is installed inside the adjusting handle 7. The first spring 8 is a torsion spring. One end of the first spring 8 is connected to the adjusting handle 7, and the other end is connected to the spring seat 9 installed inside the adjusting handle 7.

[0022] To observe the rotation angle of the throttle valve core, a scale 10 is provided on the valve body around the adjusting handle 7.

[0023] The pressure reducing valve 17 includes a pressure reducing valve sleeve 11 disposed in the pressure reducing valve cavity, a pressure reducing valve core 12 disposed inside the pressure reducing valve sleeve 11, an end cap 2 disposed at one end of the pressure reducing valve cavity, a sealing plug 15 disposed at the other end to seal the pressure reducing valve cavity, and a screw plug 16 disposed on the outside of the sealing plug 15.

[0024] A second spring 13 and a third spring 14 are respectively provided between the end cap 2 and the end of the pressure reducing valve core 12. The third spring 14 is sleeved outside the second spring 13 and is used to adjust the load change after the throttle valve is adjusted.

[0025] The pressure reducing valve 17 is provided with a first oil port connected to the oil inlet P1 and a second oil port for oil discharge. The first throttle valve 18 is provided with a third oil port connected to the second oil port and a fourth oil port connected to the oil outlet P2.

[0026] The oil inlet of solenoid valve 3 is connected to the first oil port, the oil outlet of solenoid valve 3 is connected to the oil inlet of the second throttle valve 19, and the oil outlet of the second throttle valve 19 is connected to the oil outlet P2.

[0027] The working principle of this utility model is as follows:

[0028] like Figure 4As shown, the oil enters the speed control valve through the inlet P1 and then enters the pressure reducing valve through the first port. When the throttle valve needs to be adjusted to control the oil flow rate, the adjusting handle is rotated, and the rotation angle is adjusted according to the indicated angle on the dial. At this time, part of the oil will push the pressure reducing valve core 12 to the left to squeeze the second and third springs, thereby keeping the pressure difference on both sides of the throttle valve stable. When the second and third springs cannot meet the load change caused by the adjustment of the throttle flow rate, the solenoid valve is activated to divert the oil through the solenoid valve. At the same time, the flow rate is adjusted through the second throttle valve connected in series with the solenoid valve, thereby achieving the final adjustment of the oil flow rate.

[0029] This invention provides a two-stage speed control valve. It adjusts the flow rate entering the throttle valve through a first throttle valve and a pressure reducing valve, ensuring a stable pressure difference between the inlet and outlet of the throttle valve. Furthermore, by incorporating a solenoid valve and a second throttle valve connected in parallel with the first throttle valve, it can divert and regulate the flow rate when the pressure reducing valve's adjustment range is overloaded, thereby meeting the oil flow rate requirements at the final outlet. In addition, the throttle valve flow rate adjustment can be observed via a dial, allowing for precise flow rate control and improving adjustment accuracy.

Claims

1. A two-stage speed control valve characterized by: The valve includes a valve body (1), which has a pressure reducing valve chamber for installing a pressure reducing valve (17) and a throttle valve chamber for installing a first throttle valve (18) and a second throttle valve (19). The pressure reducing valve (17) and the first throttle valve (18) are connected in series. The valve body (1) is also equipped with a solenoid valve (3), which is connected in parallel with the first throttle valve (18) and then connected to the pressure reducing valve (17). The solenoid valve (3) and the second throttle valve (19) are connected in series. The pressure reducing valve (17) is provided with a first oil port connected to the oil inlet (P1) and a second oil port for oil discharge. The first throttle valve (18) is provided with a third oil port connected to the second oil port and a fourth oil port connected to the oil outlet (P2). The oil inlet of the solenoid valve (3) is connected to the first oil port, the oil outlet of the solenoid valve (3) is connected to the oil inlet of the second throttle valve (19), and the oil outlet of the second throttle valve (19) is connected to the oil outlet (P2).

2. The dual stage speed regulating valve of claim 1, wherein: The pressure reducing valve (17) includes a pressure reducing valve sleeve (11) disposed in the pressure reducing valve cavity, a pressure reducing valve core (12) disposed inside the pressure reducing valve sleeve (11), an end cap (2) disposed at one end of the pressure reducing valve cavity, and a sealing plug (15) disposed at the other end to seal the pressure reducing valve cavity, and a screw plug (16) disposed on the outside of the sealing plug (15); a second spring (13) and a third spring (14) are respectively disposed between the end cap (2) and the end of the pressure reducing valve core (12), and the third spring (14) is sleeved on the outside of the second spring (13).

3. The dual stage speed control valve of claim 1, wherein: The first throttle valve (18) and the second throttle valve (19) have the same structure. The first throttle valve (18) includes a throttle valve sleeve (5) disposed in the throttle valve cavity. A throttle valve core (6) is rotatably installed inside the throttle valve sleeve (5). The throttle valve core (6) is connected to an adjusting handle (7) disposed on the valve body (1).

4. The dual stage speed control valve of claim 3, wherein: The adjusting handle (7) is hollow inside, and a first spring (8) is provided inside the adjusting handle (7). The first spring (8) is a torsion spring. One end of the first spring (8) is connected to the adjusting handle (7), and the other end is connected to the spring seat (9) provided inside the adjusting handle (7).

5. The dual stage speed control valve of claim 3, wherein: A scale (10) is provided on the valve body around the adjusting handle (7).

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