A plug-in hydraulic speed regulating valve for teaching

Abstract

The utility model discloses a kind of plug-in hydraulic speed regulating valves for teaching, throttle valve, pressure reducing valve, one-way valve are installed to the aluminum alloy valve block with threaded installation passage, and set into oil inlet and oil outlet on the valve block upper surface, and set flow channel system in aluminum alloy valve block, for connecting each valve in valve body and oil inlet, oil outlet. This threaded plug-in mode, weight reduction, can be conveniently disassembled by student, and each flow channel of the flow channel system constructed, it is made by drill bit, and processing is simple, applicable to teaching use. When oil inlet oil, no matter how pressure changes, the pressure difference at the two ends of throttle valve is constant under the action of pressure reducing valve, so that the hydraulic oil flow through throttle valve is constant, and oil outlet flow only changes with set flow rate;And from oil outlet to oil inlet directly walk one-way valve, prevent the pressure holding phenomenon caused by oil inlet, oil outlet reverse connection, ensure student operation safety.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic transmission and control technology, specifically relating to a cartridge-type hydraulic speed control valve for teaching purposes. 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, maintaining a constant pressure difference across the throttle valve 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 flow rate of the speed control valve remains constant (unaffected by the load).

[0003] Patent number 202322043818.9, entitled "A Utility Model Patent for a Hydraulic Speed ​​Control Valve Assembly," discloses a simple device that regulates flow rate by adjusting the scale at the output end of a throttle valve's telescopic rod. The device comprises a throttle valve, a pressure reducing valve, and a valve body. While the device has a simple structure and can achieve a constant output flow rate, the traditional structure lacks a check valve. In practical training, reverse connection can easily lead to pressure buildup, posing a safety hazard to students. Utility Model Content

[0004] To overcome the shortcomings of existing speed control valves, which are large in size and heavy in weight, this utility model provides a small, lightweight, cartridge-type hydraulic speed control valve for teaching purposes. It aims to solve the problems of existing teaching speed control valves, such as large size, heavy weight, difficulty in circuit construction, and complex structure.

[0005] This utility model is achieved through the following technical solution:

[0006] A cartridge-type hydraulic speed control valve for teaching purposes includes a valve block, on which quick-connect couplings A and B are installed. A first threaded mounting channel is provided on the valve block, in which a pressure reducing valve is installed. A second threaded mounting channel is provided on the valve block, in which a throttle valve is installed. A third threaded mounting channel is provided on the valve block, with a check valve threadedly installed at the front and a plugging screw threadedly installed at the rear.

[0007] The quick-connector A port is connected to the annular cavity of the pressure reducing valve inlet p1 in the first threaded mounting channel through the first flow channel system inside the valve block; the front outlet p2 of the pressure reducing valve is connected to the annular cavity of the throttle valve inlet q1 in the second threaded mounting channel through the second flow channel system; the front outlet q2 of the throttle valve is connected to the quick-connector B port through the third flow channel system inside the valve block; the third flow channel system is connected to the channel cavity between the check valve and the plugging screw in the third threaded mounting channel through the ninth flow channel, so that the quick-connector B port is connected to the inlet of the check valve; the outlet of the check valve is connected to the annular cavity of the pressure reducing valve inlet p1 in the first threaded mounting channel through the eleventh flow channel; the feedback chamber p3 of the pressure reducing valve is connected to the throttle valve outlet q2 through the third flow channel system.

[0008] In the above technical solution, the pressure reducing valve and the throttle valve are arranged along the longitudinal direction of the valve block, the quick-connect fitting A port and the quick-connect fitting B port are arranged along the vertical direction of the valve block, and the check valve and the plugging screw are arranged along the transverse direction of the valve block.

[0009] In the above technical solution, the first flow channel system includes a longitudinally drilled first flow channel connected to the quick-change connector A port, a vertically drilled second flow channel connected to the end of the first flow channel, and a transversely drilled third flow channel connected to the top of the second flow channel. The end of the third flow channel is connected to the annular cavity of the pressure reducing valve inlet p1 in the first threaded installation channel. The outer ends of the first flow channel, the second flow channel and the third flow channel are all provided with sealing ends.

[0010] In the above technical solution, the second flow channel system includes a fourth flow channel drilled laterally along the valve block, and a sealing end is provided at the outer end of the fourth flow channel.

[0011] In the above technical solution, the third flow channel system includes a fifth flow channel drilled longitudinally and connected to the liquid outlet q2 at the front end of the throttle valve, a sixth flow channel drilled laterally and connected to the end of the fifth flow channel, a seventh flow channel drilled longitudinally and connected to the sixth flow channel, and an eighth flow channel drilled laterally and connected to the end of the seventh flow channel. The eighth flow channel is connected to port B of the quick-change connector.

[0012] In the above technical solution, the fifth flow channel and the second threaded mounting channel are coaxially arranged, and the diameter of the fifth flow channel is smaller than the diameter of the second threaded mounting channel.

[0013] In the above technical solution, the outer ends of the sixth, seventh and eighth flow channels are all provided with sealing ends, thereby forming flow channels inside the valve block, so that the liquid will not flow out of the valve block.

[0014] In the above technical solution, the ninth flow channel is connected to the seventh flow channel of the third flow channel system.

[0015] In the above technical solution, a sealing end is provided at the outer end of the ninth flow channel, thereby forming a flow channel inside the valve block.

[0016] In the above technical solution, the eleventh flow channel and the third threaded mounting channel are coaxially arranged, and the diameter of the eleventh flow channel is smaller than the diameter of the third threaded mounting channel.

[0017] The advantages and beneficial effects of this utility model are as follows:

[0018] The cartridge-type hydraulic speed control valve of this utility model installs a throttle valve, a pressure reducing valve, and a check valve onto an aluminum alloy valve block with threaded mounting channels. An oil inlet (i.e., quick-change connector A port) and an oil outlet (i.e., quick-change connector B port) are provided on the upper surface of the valve block. A flow channel system is provided inside the aluminum alloy valve block to connect the valves inside the valve body as well as the oil inlet and outlet ports.

[0019] The aforementioned threaded cartridge assembly method facilitates the disassembly and assembly of throttle valves, pressure reducing valves, and check valves for students, serving an educational purpose and enabling them to understand the structure and working principle of hydraulic speed control valves. Furthermore, each flow channel in the flow channel system constructed in this invention is drilled using a drill bit, simplifying the manufacturing process. The entire cartridge-type hydraulic speed control valve is small in size, lightweight, and easy to manufacture, making it suitable for teaching purposes.

[0020] When oil enters through the inlet, regardless of pressure changes, the pressure difference across the throttle valve remains constant under the action of the pressure reducing valve, ensuring a constant flow of hydraulic oil through the throttle valve. The flow rate at the outlet only changes with the set flow rate. The flow from the outlet to the inlet goes directly through the check valve to prevent pressure buildup caused by reversing the inlet and outlet connections, thus ensuring the safety of students' operation. Attached Figure Description

[0021] Figure 1 This is an outline drawing of a cartridge-type hydraulic speed control valve used for teaching.

[0022] Figure 2 This is a perspective view of the internal structure of a cartridge-type hydraulic speed control valve used for teaching (oil flows from quick-change connector A port to quick-change connector B port).

[0023] Figure 3 This is a perspective view of the internal structure of a cartridge-type hydraulic speed control valve used for teaching (oil flows from quick-change connector B port to quick-change connector A port).

[0024] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0026] This embodiment provides a cartridge-type hydraulic speed control valve for teaching purposes; see appendix. Figure 1-Appendix Figure 3 The system includes a valve block 100, on which quick-connect couplings A port 101 and B port 102 are installed. A first threaded mounting channel is provided on the valve block 100, in which a pressure reducing valve 200 is installed. A second threaded mounting channel is provided on the valve block 100, in which a throttle valve 300 is installed. A third threaded mounting channel is provided on the valve block 100, in which a check valve 400 is installed by thread at the front and an oil plugging screw 500 is installed by thread at the rear.

[0027] Furthermore, the pressure reducing valve 200 and the throttle valve 300 are arranged longitudinally along the valve block 100, the quick-connect fitting A port 101 and the quick-connect fitting B port 102 are arranged vertically along the valve block 100, and the check valve 400 and the plugging screw 500 are arranged transversely along the valve block 100.

[0028] The quick-connector A port 101 is connected to the annular cavity of the inlet p1 of the pressure reducing valve 200 in the first threaded mounting channel through the first flow channel system inside the valve block 100. Further, the first flow channel system includes a longitudinally drilled first flow channel 1 connected to the quick-connector A port 101, a vertically drilled second flow channel 2 connected to the end of the first flow channel 1, and a transversely drilled third flow channel 3 connected to the top of the second flow channel 2. The end of the third flow channel 3 is connected to the annular cavity of the inlet p1 of the pressure reducing valve 200 in the first threaded mounting channel. The first flow channel 1, the second flow channel 2, and the third flow channel 3 are all drilled by a drill bit, and the outer ends of the first flow channel 1, the second flow channel 2, and the third flow channel 3 are all provided with sealing ends, thereby forming a flow channel inside the valve block, preventing liquid from flowing out of the valve block.

[0029] The front outlet p2 of the pressure reducing valve 200 in the first threaded mounting channel is connected to the annular cavity of the inlet q1 of the throttle valve 300 in the second threaded mounting channel through the second flow channel system; furthermore, the second flow channel system includes a fourth flow channel 4 drilled laterally along the valve block 100, and a sealing end is provided at the outer end of the fourth flow channel 4.

[0030] The front outlet q2 of the throttle valve 300 in the second threaded mounting channel is connected to the quick-change connector B port 102 through the third flow channel system inside the valve block 100. Further, the third flow channel system includes a longitudinally drilled fifth flow channel 5 connected to the front outlet q2 of the throttle valve 300, a transversely drilled sixth flow channel 6 connected to the end of the fifth flow channel 5, a longitudinally drilled seventh flow channel 7 connected to the sixth flow channel 6, and a transversely drilled eighth flow channel 8 connected to the end of the seventh flow channel 7. The eighth flow channel 8 is connected to the quick-change connector B port 102. The fifth flow channel 5 and the second threaded mounting channel are coaxially arranged, and the diameter of the fifth flow channel 5 is smaller than the diameter of the second threaded mounting channel. Sealing ends are provided at the outer ends of the sixth flow channel 6, the seventh flow channel 7, and the eighth flow channel 8, thus forming a flow channel inside the valve block, preventing liquid from flowing out of the valve block.

[0031] The feedback chamber p3 in the middle of the pressure reducing valve 200 is connected to the sixth flow channel 6 of the third flow channel system, thereby connecting the feedback chamber p3 of the pressure reducing valve 200 to the outlet q2 of the throttle valve 300. Its function is to keep the pressure difference across the throttle valve 300 constant, and the flow rate can be adjusted by adjusting the knob of the throttle valve 300.

[0032] The third flow channel system is connected to the channel cavity 10 (which can be called the tenth flow channel) between the one-way valve 400 and the plugging screw 500 in the third threaded installation channel through the ninth flow channel 9, so that the quick-connect connector B port 102 is connected to the inlet of the one-way valve 400; furthermore, the ninth flow channel 9 is drilled vertically and is connected to the seventh flow channel 7 of the third flow channel system. The outer end of the ninth flow channel 9 is provided with a sealing end, thereby forming a flow channel inside the valve block.

[0033] The outlet of the one-way valve 400 in the third threaded mounting channel is connected to the annular cavity of the inlet p1 of the pressure reducing valve 200 in the first threaded mounting channel through the eleventh flow channel 11; furthermore, the eleventh flow channel 11 and the third threaded mounting channel are coaxially arranged, and the diameter of the eleventh flow channel 11 is smaller than the diameter of the third threaded mounting channel, both of which are drilled laterally along the valve block 100.

[0034] The working process of the cartridge-type hydraulic speed control valve of this utility model is as follows:

[0035] See appendix Figure 2When hydraulic oil enters through quick-connect coupling A port 101, the oil flows sequentially through the first flow channel 1, the second flow channel 2, and the third flow channel 3 in the direction of the arrow, and then flows into the annular cavity of the pressure reducing valve 200 in the first threaded mounting channel (i.e., connected to the pressure reducing valve 200 inlet p1). Due to the one-way action of the check valve 400 (i.e., the check valve 400 cannot flow from its outlet to its inlet), the oil will not enter the check valve 400 through the annular cavity and the eleventh flow channel 11. Instead, the oil will flow out from the pressure reducing valve 200 outlet p2 and enter the fourth flow channel 4 (which plays a pressure reducing role), and then flow into the throttle valve 300 inlet q1. The oil will then flow out from the throttle valve 300 outlet q2, and sequentially through the fifth flow channel 5, the sixth flow channel 6, the seventh flow channel 7, and the eighth flow channel 8, before flowing out from quick-connect coupling B port 102.

[0036] See appendix Figure 3 When hydraulic oil enters through quick-connect coupling B port 102, the oil flows sequentially along the direction of the arrow, passing through the eighth flow channel 8, the seventh flow channel 7, and the ninth flow channel 9, entering the channel cavity 10 between the check valve 400 and the plugging screw 500 in the third threaded mounting channel (this channel cavity 10 can be called the tenth flow channel). It then flows through the check valve 400, and from the outlet of the check valve 400, through the eleventh flow channel 11, into the annular cavity at the inlet p1 of the pressure reducing valve 200 in the first threaded mounting channel. The oil then passes through this annular cavity sequentially through the third flow channel 3, the second flow channel 2, and the first flow channel 1, before flowing out from quick-connect coupling A port 101. During this process, the oil flows smoothly without any pressure buildup.

[0037] Therefore, the cartridge-type hydraulic speed control valve designed in this embodiment can ensure that the quick-connect connector A port 101 to quick-connect connector B port 102 functions as a speed control valve, while the quick-connect connector B port 102 to quick-connect connector A port 101 directly flows through the check valve 400, preventing pressure buildup caused by reversing the AB ports.

[0038] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0040] The present invention has been described above by way of example. It should be noted that, without departing from the core of the present invention, any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort fall within the protection scope of the present invention.

Claims

1. A cartridge-type hydraulic speed control valve for teaching purposes, characterized in that: The valve includes a valve block with quick-connect fittings A and B installed on it. A first threaded mounting channel is provided on the valve block, in which a pressure reducing valve is installed. A second threaded mounting channel is provided on the valve block, in which a throttle valve is installed. A third threaded mounting channel is provided on the valve block, with a check valve installed at the front and an oil plug screw installed at the rear. The quick-connector A port is connected to the annular cavity of the pressure reducing valve inlet p1 in the first threaded mounting channel through the first flow channel system inside the valve block; the front outlet p2 of the pressure reducing valve is connected to the annular cavity of the throttle valve inlet q1 in the second threaded mounting channel through the second flow channel system; the front outlet q2 of the throttle valve is connected to the quick-connector B port through the third flow channel system inside the valve block; the third flow channel system is connected to the channel cavity between the check valve and the plugging screw in the third threaded mounting channel through the ninth flow channel, so that the quick-connector B port is connected to the inlet of the check valve; the outlet of the check valve is connected to the annular cavity of the pressure reducing valve inlet p1 in the first threaded mounting channel through the eleventh flow channel; the feedback chamber p3 of the pressure reducing valve is connected to the throttle valve outlet q2 through the third flow channel system.

2. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 1, characterized in that: The pressure reducing valve and throttle valve are arranged longitudinally along the valve block, the quick-connect fitting A port and quick-connect fitting B port are arranged vertically along the valve block, and the check valve and plug screw are arranged transversely along the valve block.

3. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 1, characterized in that: The first flow channel system includes a longitudinally drilled first flow channel connected to the quick-change connector A port, a vertically drilled second flow channel connected to the end of the first flow channel, and a transversely drilled third flow channel connected to the top of the second flow channel. The end of the third flow channel is connected to the annular cavity of the pressure reducing valve inlet p1 in the first threaded installation channel. The outer ends of the first flow channel, the second flow channel, and the third flow channel are all provided with sealing ends.

4. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 1, characterized in that: The second flow channel system includes a fourth flow channel drilled laterally along the valve block, with a sealing end provided at the outer end of the fourth flow channel.

5. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 1, characterized in that: The third flow channel system includes a fifth flow channel drilled longitudinally and connected to the outlet q2 at the front end of the throttle valve; a sixth flow channel drilled laterally and connected to the end of the fifth flow channel; a seventh flow channel drilled longitudinally and connected to the sixth flow channel; and an eighth flow channel drilled laterally and connected to the end of the seventh flow channel. The eighth flow channel is connected to port B of the quick-change connector.

6. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 5, characterized in that: The fifth flow channel and the second threaded mounting channel are coaxially arranged, and the diameter of the fifth flow channel is smaller than the diameter of the second threaded mounting channel.

7. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 5, characterized in that: The outer ends of the sixth, seventh, and eighth flow channels are all provided with sealing ends.

8. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 1, characterized in that: The ninth flow channel is connected to the seventh flow channel of the third flow channel system.

9. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 1, characterized in that: A sealing end is provided at the outer end of the ninth flow channel.

10. The cartridge-type hydraulic speed control valve for teaching purposes according to claim 1, characterized in that: The eleventh flow channel and the third threaded mounting channel are coaxially arranged, and the diameter of the eleventh flow channel is smaller than that of the third threaded mounting channel.

Images