A multi-functional threaded cartridge valve

Abstract

The application discloses a multifunctional threaded cartridge valve, which comprises a T-shaped adjusting screw rod, a valve seat, a valve sleeve, a valve core and a spring, the T-shaped end of the T-shaped adjusting screw rod is arranged on the inner side of the valve seat, the upper end of the T-shaped adjusting screw rod is in threaded connection with the valve seat, the upper end of the valve sleeve is in threaded connection with the inner side of the valve seat, the valve core is movably sleeved in the valve sleeve and forms a control cavity at the bottom of the inner side of the valve sleeve, the upper end of the valve core and the lower end of the T-shaped adjusting screw rod form a spring cavity, and the spring is arranged in the spring cavity. The multifunctional threaded cartridge valve has the functions of an overflow valve and a pressure compensation type flow valve, effectively solves the problems of poor universality and interchangeability caused by structural differences of the overflow valve and the pressure compensation type flow valve, and the problems of resource waste and economic loss caused by difficult maintenance of hydraulic equipment, waste of factory stock components, and only scrap of locally damaged components, improves economic benefits, and expands the application range of the cartridge valve.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valve equipment technology, and in particular to a multifunctional threaded cartridge valve. Background Technology

[0002] In the hydraulic field, hydraulic valves can be classified into dozens of categories according to their function, such as relief valves, pressure reducing valves, throttle valves, and check valves. This multitude of categories leads to poor versatility and interchangeability among hydraulic valves, resulting in difficulties in maintaining hydraulic equipment. The numerous categories also result in poor economic applicability; factories often have large stock of some valves while others are out of stock. Different categories naturally have different structures, and valves with different structures must be scrapped after damage, causing significant economic losses. Threaded cartridge valves, as a type of hydraulic valve, have a wide range of applications and are numerous. Among threaded cartridge valves, relief valves and pressure-compensated flow valves are used extremely frequently and in large quantities, making the problems caused by structural differences in relief valves and pressure-compensated flow valves particularly prominent.

[0003] In light of the current situation, it is essential to standardize the structure of relief valves and pressure-compensated flow valves, and to design and manufacture a threaded cartridge valve that can be used as both a relief valve and a pressure-compensated flow valve. Summary of the Invention

[0004] The purpose of this invention is to provide a multifunctional threaded cartridge valve that can be used as both an overflow valve and a pressure-compensated flow valve, thereby solving the existing technical problems.

[0005] This invention provides a multifunctional threaded cartridge valve, comprising a T-shaped adjusting screw, a valve seat, a valve sleeve, a valve core, and a spring. The T-shaped end of the T-shaped adjusting screw is placed inside the valve seat and slidably sealed to the inner side of the valve seat. The upper end of the T-shaped adjusting screw is threadedly connected to the valve seat. The upper end of the valve sleeve is placed inside the lower part of the valve seat and threadedly connected to the inner side of the valve seat. The valve core is movably sleeved within the valve sleeve, forming a control cavity at the bottom of the inner side of the valve sleeve. The upper end of the valve core and the lower end of the T-shaped adjusting screw form a spring cavity inside the valve seat. The valve core has an inner cavity, a first annular protrusion, and a second annular protrusion. The first annular protrusion is located in the middle of the outer side of the valve core and has several fixed throttling holes. The second annular protrusion is located at the valve core... The valve core has several oil passage holes located between the first and second annular protrusions on its outer lower end. The inner cavity is located inside the valve core and its bottom is connected to the oil passage holes. The inner cavity has a first recessed platform and a second recessed platform arranged sequentially from top to bottom. The first recessed platform has a first plug for isolating the inner cavity from the spring cavity. The second recessed platform has a second plug for isolating the inner cavity from the fixed throttling orifice. The bottom of the inner cavity has a vertical connecting hole for connecting the inner cavity and the control cavity. The spring is located inside the spring cavity. The upper end of the spring abuts against the lower end of the T-shaped adjusting screw, and the lower end of the spring abuts against the upper side of the first plug. The valve sleeve has a first oil hole and a second oil hole that correspond to and match the oil passage holes and the fixed throttling orifice.

[0006] Preferably, the lower end of the T-shaped adjusting screw is provided with a third countersunk platform that abuts against the upper end of the spring.

[0007] Preferably, the second annular protrusion is provided with a plurality of pressure equalization grooves.

[0008] Preferably, the lower end of the valve core is provided with a shock-absorbing groove.

[0009] Preferably, the T-shaped end of the T-shaped adjusting screw is provided with a first sealing ring for achieving a sealed connection between the T-shaped adjusting screw and the valve seat.

[0010] Preferably, a second sealing ring is provided on the lower outer side of the valve seat.

[0011] Preferably, the valve sleeve is provided with a third sealing ring and a fourth sealing ring on its outer side. The third sealing ring is located between the fixed throttling orifice and the oil passage orifice, and the fourth sealing ring is located at the lower part of the oil passage orifice.

[0012] Preferably, it also includes a locking nut, which is located at the upper end of the valve seat and threadedly connected to the T-shaped adjusting screw.

[0013] Preferably, it also includes a wire snap ring, which is disposed on the upper side inside the valve sleeve and above the valve core.

[0014] Preferably, both the first plug and the second plug are threadedly connected to the inner cavity sidewall.

[0015] Compared with the prior art, the present invention provides a multifunctional threaded cartridge valve that simultaneously functions as a relief valve and a pressure-compensated flow valve. This effectively solves the problems of poor versatility and interchangeability caused by the structural differences between relief valves and pressure-compensated flow valves in the prior art, as well as the problems of difficult maintenance of hydraulic equipment, waste and shortage of factory inventory components, and resource waste and economic losses caused by the need to scrap locally damaged components. This improves economic benefits and expands the application scope of cartridge valves. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multifunctional threaded cartridge valve according to the present invention.

[0017] Figure 2 yes Figure 1 sectional view,

[0018] Figure 3 This is a schematic diagram of the valve core structure of the present invention.

[0019] Figure 4 yes Figure 3 sectional view,

[0020] Figure 5 This is a cross-sectional view of the oil flow direction in the overflow state when the present invention is used as an overflow valve.

[0021] Figure 6 This is a cross-sectional view of the oil flow direction in the initial state when the present invention is used as a pressure-compensating flow valve.

[0022] Figure 7 This is a cross-sectional view of the oil flow direction under working conditions when the present invention is used as a pressure-compensating flow valve.

[0023] In the diagram: 1. T-shaped adjusting screw, 2. Valve seat, 3. Valve sleeve, 4. Valve core, 41. Inner cavity, 42. First annular protrusion, 43. Second annular protrusion, 44. Fixed throttling orifice, 45. Oil passage hole, 46. First countersunk plate, 47. Second countersunk plate, 48. First plug, 49. Second plug, 5. Spring, 6. Control chamber, 7. Spring chamber, 8. Connecting hole, 9. Third countersunk plate, 10. Pressure equalizing groove, 11. First sealing ring, 12. Second sealing ring, 13. Third sealing ring, 14. Fourth sealing ring, 15. Locking nut, 16. Wire snap ring. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] It should be noted that in this invention, the terms "first," "second," "third," and "fourth" merely represent different components and do not imply any particular order. Figure 1 For example, vertically facing up is "up", vertically facing down is "down", vertically facing left is "left", and vertically facing right is "right".

[0026] like Figures 1-7 As shown, a multifunctional threaded cartridge valve includes a T-shaped adjusting screw 1, a valve seat 2, a valve sleeve 3, a valve core 4, and a spring 5. The T-shaped end of the T-shaped adjusting screw 1 is placed inside the valve seat 2 and is slidably sealed to the inside of the valve seat 2. The upper end of the T-shaped adjusting screw 1 is threaded to the valve seat 2. The upper end of the valve sleeve 3 is placed inside the lower part of the valve seat 2 and is threaded to the inside of the valve seat 2. The valve core 4 is movably sleeved inside the valve sleeve 3 and forms a control cavity 6 at the bottom of the inner side of the valve sleeve 3. The upper end of the valve core 4 and the lower end of the T-shaped adjusting screw 1 form a spring cavity 7 inside the valve seat 2. The valve core 4 has an inner cavity 41, a first annular protrusion 42, and a second annular protrusion 43. The first annular protrusion 42 is located in the middle of the outer side of the valve core 4 and has several fixed throttling holes 44. The second annular protrusion 43 is located at the lower end of the outer side of the valve core 4, and the valve core... The valve core 4 has several oil passage holes 45 located between the first annular protrusion 42 and the second annular protrusion 43. The inner cavity 41 is located inside the valve core 4 and the bottom of the inner cavity 41 is connected to the oil passage holes 45. The inner cavity 41 has a first recessed platform 46 and a second recessed platform 47 arranged from top to bottom. The first recessed platform 46 is provided with a first plug 48 for isolating the inner cavity 41 from the spring cavity 7. The second recessed platform 47 is provided with a second plug 49 for isolating the inner cavity 41 from the fixed throttling orifice 44. The bottom of the inner cavity 41 is provided with a vertical connecting hole 8 for connecting the inner cavity 41 and the control cavity 6. The spring 5 is located in the spring cavity 7. The upper end of the spring 5 abuts against the lower end of the T-shaped adjusting screw 1, and the lower end of the spring 5 abuts against the upper side of the first plug 48. The valve sleeve 3 has a first oil hole 31 and a second oil hole 32 that correspond to and match the oil passage holes 45 and the fixed throttling orifice 44.

[0027] In this embodiment, the T-shaped end of the T-shaped adjusting screw 1 ensures that the T-shaped adjusting screw 1 will not be screwed out during the upward adjustment process, thereby avoiding the safety hazard of oil spraying from the upper part of the valve seat 2 and enhancing the safety of operation.

[0028] In this embodiment, there are six fixed throttling orifices 44 and six oil passages 45, which are arranged in a ring on the valve core 4. The valve sleeve 3 has through holes that match the fixed throttling orifices 44 and the oil passages 45 to achieve corresponding communication.

[0029] In this embodiment, the multi-functional cartridge valve functions as both a relief valve and a pressure-compensating flow valve. When used as a relief valve, its operating procedure is as follows:

[0030] In the initial closed state, the valve core 4 is in the lower limit position. When the cartridge valve needs to work, the external oil flows into the inner cavity 41 and into the control cavity 6 through the first oil hole 31 and the oil passage hole 45. When the pressure in the control cavity 6 reaches the preset value of the spring 5, since the spring cavity 7 is connected to the external oil tank, the pressure in the spring cavity 7 can be ignored. The valve core 4 begins to move upward until the pressure in the oil passage hole 45 and the spring force (the spring force here can be preset) reach a balance. At this time, the oil in the oil passage hole 45 flows into the external oil tank through the second oil hole 32, that is, the cartridge valve begins to overflow, realizing the function of the overflow valve.

[0031] When used as a pressure-compensating flow valve, its working process is as follows:

[0032] First, remove the second plug 49 to connect the fixed throttle orifice 44 with the second oil hole 32. At this time, the first oil hole 31 and the second oil hole 32 are connected. In this structure, the pressure difference between the control chamber 6 and the spring chamber 7 is equal to the set value of the spring 5 (the spring chamber 5 may not be connected to the external oil tank). When the cartridge valve is working, the movement of the valve core 4 and the first oil hole 31 will form a pressure-reducing port with variable pressure to ensure that the valve core 4 is balanced. That is, when the oil pressure flowing into the valve body through the first oil hole 31 is greater than the set value of the spring 5, the external oil flows through the first oil hole 31. The oil passage 31 and oil passage 45 enter the inner cavity 41 and then enter the control cavity 6 through the connecting hole 8. In order to ensure that the upper and lower ends of the valve core 4 are balanced, the valve core 4 moves upward at this time. The flow area of ​​the pressure reducing port will decrease, and the pressure reducing effect of the pressure reducing port will be enhanced. This will reduce the oil pressure entering the cartridge valve. The oil flows out from the second oil hole 32 through the fixed throttling hole 44 and communicates with the spring cavity 7 to ensure that the pressure difference across the fixed throttling hole 44 remains unchanged. This also ensures that the flow rate through the cartridge valve will not change due to the load pressure change of the second oil hole 32, thus realizing the pressure compensation function.

[0033] like Figure 2 As shown, the lower end of the T-shaped adjusting screw 1 is provided with a third recess 9 that abuts against the upper end of the spring 5. In this embodiment, by providing the third recess 9, the upper end of the spring 5 can stably abut against the lower end of the T-shaped adjusting screw 1, ensuring its normal operation.

[0034] like Figure 3 , Figure 4 As shown, the second annular protrusion 43 is provided with a plurality of pressure equalizing grooves 10. In this embodiment, the pressure equalizing grooves 10 are arranged in a ring on the second annular protrusion 43. The pressure equalizing grooves 10 can effectively prevent the valve core 4 from shifting during movement, thereby reducing the occurrence of jamming.

[0035] The lower end of the valve core 4 is provided with a shock-absorbing groove (not shown in the figure). In this embodiment, by setting the shock-absorbing groove, the impact during the switching of different states of the cartridge valve is reduced, which extends the service life of the component to a certain extent. Here, the different states of the cartridge valve include the open state and the closed state.

[0036] like Figure 2 As shown, the T-shaped end of the T-shaped adjusting screw 1 is provided with a first sealing ring 11 for achieving a sealed connection between the T-shaped adjusting screw 1 and the valve seat 2.

[0037] In this embodiment, by setting a first sealing ring 11 at the T-shaped end of the T-shaped adjusting screw, the oil in the spring cavity 7 is effectively prevented from seeping out from the upper part of the valve seat 2.

[0038] like Figure 1 As shown, a second sealing ring 12 is provided on the lower outer side of the valve seat 2.

[0039] In this embodiment, by setting a second sealing ring 12, the lower part of the valve sleeve 3 is sealed when the cartridge valve is placed in an external device, thus preventing oil leakage from the lower part.

[0040] like Figure 1 As shown, the valve sleeve is provided with a third sealing ring 13 and a fourth sealing ring 14 on the outside. The third sealing ring 13 is located between the fixed throttling hole 44 and the oil passage hole 45, and the fourth sealing ring 14 is located at the lower part of the oil passage hole 45.

[0041] In this embodiment, by setting the third sealing ring 13 and the fourth sealing ring 14, the cartridge valve is sealed when placed in an external device, ensuring the normal operation of the cartridge valve.

[0042] like Figure 1 , Figure 2 As shown, it also includes a locking nut 15, which is located at the upper end of the valve seat 2 and is threadedly connected to the T-shaped adjusting screw 1.

[0043] like Figure 2 As shown, it also includes a wire snap ring 16, which is located on the upper side inside the valve sleeve 3 and above the valve core 4.

[0044] In this embodiment, by providing a wire retaining ring 16 on the upper side inside the valve sleeve 3, it can effectively prevent the spring 5 from being over-compressed and also avoid pressure buildup in the spring cavity 7.

[0045] like Figure 2 As shown, both the first plug 48 and the second plug 49 are threadedly connected to the side wall of the inner cavity 41.

[0046] The present invention provides a detailed description of a multifunctional threaded cartridge valve. Specific examples have been used to illustrate the principles and implementation methods of the invention. These examples are merely illustrative and are intended to help understand the core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A multifunctional threaded cartridge valve, characterized in that, The system includes a T-shaped adjusting screw (1), a valve seat (2), a valve sleeve (3), a valve core (4), and a spring (5). The T-shaped end of the T-shaped adjusting screw (1) is placed inside the valve seat (2) and is slidably and sealingly connected to the inside of the valve seat (2). The upper end of the T-shaped adjusting screw (1) is threadedly connected to the valve seat (2). The upper end of the valve sleeve (3) is placed inside the lower part of the valve seat (2) and is threadedly connected to the inside of the valve seat (2). The valve core (4) is movably sleeved inside the valve sleeve (3) and forms a control valve at the bottom of the inner side of the valve sleeve (3). The upper end of the valve core (4) and the lower end of the T-shaped adjusting screw (1) form a spring cavity (7) inside the valve seat (2). The valve core (4) is provided with an inner cavity (41), a first annular protrusion (42) and a second annular protrusion (43). The first annular protrusion (42) is located in the middle of the outer side of the valve core (4) and has several fixed throttling holes (44) on it. The second annular protrusion (43) is located at the lower end of the outer side of the valve core (4) and has several annular holes (44) on it. An oil passage hole (45) is located between the first annular protrusion (42) and the second annular protrusion (43). The inner cavity (41) is located inside the valve core (4) and the bottom of the inner cavity (41) is connected to the oil passage hole (45). The inner cavity (41) is provided with a first countersunk platform (46) and a second countersunk platform (47) from top to bottom. The first countersunk platform (46) is provided with a first plug (48) for isolating the inner cavity (41) from the spring cavity (7). The second countersunk platform (47) is detachably provided with a plug for isolating the inner cavity (41) from the solid spring cavity (7). The second plug (49) of the fixed throttling orifice (44) has a vertically arranged connecting hole (8) at the bottom of the inner cavity (41) for connecting the inner cavity (41) and the control cavity (6). The spring (5) is located in the spring cavity (7). The upper end of the spring (5) abuts against the lower end of the T-shaped adjusting screw (1), and the lower end of the spring (5) abuts against the upper side of the first plug (48). The valve sleeve (3) is provided with a first oil hole (31) and a second oil hole (32) that match the oil passage hole (45) and the fixed throttling orifice (44).

2. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, The lower end of the T-shaped adjusting screw (1) is provided with a third countersunk platform (9) that abuts against the upper end of the spring (5).

3. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, The second annular protrusion (43) is provided with several pressure equalization grooves (10).

4. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, The lower end of the valve core (4) is provided with a shock-absorbing groove.

5. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, The T-shaped end of the T-shaped adjusting screw (1) is provided with a first sealing ring (11) for achieving a sealed connection between the T-shaped adjusting screw (1) and the valve seat (2).

6. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, The valve seat (2) is provided with a second sealing ring (12) on the lower outer side.

7. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, The valve sleeve (3) is provided with a third sealing ring (13) and a fourth sealing ring (14) on the outside. The third sealing ring (13) is located between the fixed throttling hole (44) and the oil passage hole (45), and the fourth sealing ring (14) is located at the lower part of the oil passage hole (45).

8. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, It also includes a locking nut (15), which is located at the upper end of the valve seat (2) and threadedly connected to the T-shaped adjusting screw (1).

9. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, It also includes a wire snap ring (16), which is located on the upper side inside the valve sleeve (3) and above the valve core (4).

10. The multifunctional threaded cartridge valve as described in claim 1, characterized in that, The first plug (48) and the second plug (49) are both threadedly connected to the side wall of the inner cavity (41).

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