Threaded cartridge valve

Abstract

The utility model relates to a threaded cartridge valve, which belongs to the field of cartridge valves and comprises a valve sleeve and a valve core, the valve core is inserted from the bottom of the valve sleeve, the valve core is connected with the valve sleeve in an up-down sliding manner, an elastic component is arranged on the valve sleeve and used for applying downward elastic thrust to the valve core, and the valve sleeve comprises an upper valve sleeve and a lower valve sleeve. The upper valve sleeve and the lower valve sleeve are distributed up and down, the bottom end of the upper valve sleeve abuts against the top end of the lower valve sleeve, a first cavity is formed in the bottom of the upper valve sleeve, a second cavity is formed in the bottom of the lower valve sleeve and extends to the bottom of the lower valve sleeve, a round hole is formed in the peripheral wall of the upper valve sleeve, and the round hole is communicated with the first cavity. The round hole extends to the inner wall of the first cavity, a gasket is arranged below the lower valve sleeve, a first spring is arranged between the gasket and the lower valve sleeve, the pressure needed in the reverse opening process is reduced, and damage caused by too large pressure is avoided.

Description

Technical Field

[0001] The utility model relates to a threaded cartridge valve, belonging to the field of cartridge valves. Background Art

[0002] The threaded cartridge valve uses liquid as the medium. In the hydraulic system, it can adjust and control the fluid direction, flow rate, pressure and other oil circuit actions through mechanical or electrical means. Its installation form is a threaded hydraulic actuator. Since the threaded cartridge valve has a series of advantages such as easy processing, easy disassembly and assembly, compact structure, strong interchangeability, and easy mass production, the threaded cartridge valve is widely used in various hydraulic systems.

[0003] The utility model patent with the publication number CN202223130861.0 discloses a cleanable threaded cartridge valve, comprising: an upper end block, the outer end of which is provided with an anti-wear strip, and the inner end of which is connected with a connecting assembly, the bottom end of which is provided with a stabilizing block, a connecting rod, which is provided at the inner end of the connecting assembly, and the outer end of which is provided with a spring, the lower end of which is connected with a rubber pad, and a gripping rod is provided below the rubber pad; a gripping block, which is provided at the lower end of the gripping rod, and a guide block is provided at the lower end of the gripping block, the outer end of which is connected with a lower end block, and a positioning ring is provided at the outer end of the lower end block, and a control cavity is provided inside the lower side of the lower end block, and an oil inlet cavity is provided inside the upper side of the lower end block, and an oil inlet port is provided at the outer end of the oil inlet cavity. The cleanable threaded cartridge valve facilitates the cartridge valve to control the discharge of oil by the oil volume, and at the same time, facilitates the cleaning of the cartridge valve. However, in the prior art, when the hydraulic oil needs to be transported from the oil outlet to the inside of the valve sleeve and discharged from the oil inlet due to production needs, that is, when the reverse opening is realized, the pressure pushing the valve core to move is relatively large, which can easily cause the internal pressure of the threaded cartridge valve to be too high and damaged;

[0004] Therefore, a threaded cartridge valve is needed to reduce the pressure required for reverse opening. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to overcome the deficiencies of the prior art, a threaded cartridge valve is provided which reduces the pressure required for reverse opening.

[0006] The technical solution adopted by the utility model to solve the above problems is: a threaded cartridge valve, comprising a valve sleeve and a valve core, the valve core is inserted from the bottom of the valve sleeve, the valve core is connected to the valve sleeve in an upward and downward sliding manner, an elastic component is arranged on the valve sleeve, the elastic component is used to apply a downward elastic thrust to the valve core, the valve sleeve comprises an upper valve sleeve and a lower valve sleeve, the upper valve sleeve and the lower valve sleeve are distributed up and down, the bottom end of the upper valve sleeve abuts against the top end of the lower valve sleeve, the bottom of the upper valve sleeve is provided with a first cavity, and the bottom of the lower valve sleeve is provided with a second cavity. cavity, the second cavity extends to the bottom of the lower valve sleeve, a circular hole is provided on the outer peripheral wall of the upper valve sleeve, the circular hole extends to the inner wall of the first cavity, a gasket is provided below the lower valve sleeve, a first spring is provided between the gasket and the lower valve sleeve, the two ends of the first spring are respectively connected to the gasket and the lower valve sleeve, the elastic force of the first spring is less than the elastic force applied by the elastic component to the valve core, the valve core is sealed against the top end of the second cavity, a gap is provided between the valve core and the inner wall of the second cavity, and the valve core passes through the gasket.

[0007] Preferably, the valve core includes an adjusting part, a sealing part and a pushing part, and the adjusting part, the sealing part and the pushing part are connected in sequence from top to bottom, the adjusting part is inserted into the first cavity from the bottom of the upper valve sleeve, the adjusting part is slidably and sealedly connected to the inner wall of the first cavity, the top of the sealing part is located in the first cavity, the bottom of the sealing part is located in the second cavity, the sealing part is sealed against the top end of the second cavity, the pushing part passes through the second cavity, a gap is arranged between the pushing part and the inner wall of the second cavity, and the bottom end of the pushing part is located below the gasket.

[0008] Preferably, the sealing portion is in a truncated cone shape, the axis of the sealing portion is arranged vertically, and the large diameter end of the sealing portion is arranged upward.

[0009] Preferably, a sealing ring is provided at the connection between the pushing portion and the inner wall of the third through hole.

[0010] Preferably, the connection position between the sealing portion and the adjusting portion is located at the through hole.

[0011] Preferably, the elastic force component includes a spring seat and a second spring, both of which are located in the first cavity, the spring seat, the second spring and the valve core are distributed from top to bottom, the two ends of the second spring are respectively connected to the spring seat and the valve core, the elastic force of the second spring is greater than the elastic force of the first spring, the second spring is in a compressed state, and a lifting unit is connected to the spring seat, which is used to realize the lifting and lowering of the spring seat.

[0012] Preferably, the lifting unit includes a screw and a sealing nut, the screw is vertically inserted into the upper valve sleeve, the screw is threadedly connected to the upper valve sleeve, the top of the spring seat abuts against the bottom end of the screw, the sealing nut is threadedly connected to the screw, and the sealing nut abuts against the top of the upper valve sleeve.

[0013] Preferably, the top of the spring seat is spherical.

[0014] Preferably, a blind hole is provided at the bottom of the upper valve sleeve, the top of the first spring is inserted into the blind hole, and the first spring is connected to the top in the blind hole.

[0015] Preferably, the outer surfaces of the valve sleeve and the valve core are treated with anti-corrosion.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The utility model discloses a threaded cartridge valve, which reduces the pressure required for reverse opening and avoids damage due to excessive pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a threaded cartridge valve in use state of the utility model;

[0019] Figure 2 This is a structural schematic diagram of a threaded cartridge valve of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the valve core;

[0021] Figure 4 is a schematic diagram of the structure of the mounting base;

[0022] Figure 5 This is a diagram of the overflow capacity of a threaded cartridge valve of the utility model;

[0023] Figure 6 This is a reverse opening capability diagram of a threaded cartridge valve of the utility model.

[0024] in:

[0025] Valve sleeve 1, valve core 2, elastic component 3, mounting seat 4, step hole 5, oil inlet 6, oil outlet 7;

[0026] Upper valve sleeve 11, lower valve sleeve 12, first cavity 13, second cavity 14, round hole 15, gasket 16, first spring 17, blind hole 18;

[0027] Adjusting part 21, sealing part 22, pushing part 23, sealing ring 24;

[0028] Spring seat 31, second spring 32, lifting unit 33;

[0029] Screw 331, sealing nut 332;

[0030] A first through hole 51 , a second through hole 52 , a third through hole 53 , and a fourth through hole 54 . DETAILED DESCRIPTION

[0031] like Figure 1-4 As shown, a threaded cartridge valve in this embodiment includes a valve sleeve 1 and a valve core 2. The outer surfaces of the valve sleeve 1 and the valve core 2 are both treated with anti-corrosion. The valve core 2 is inserted from the bottom of the valve sleeve 1. The valve core 2 is connected to the valve sleeve 1 by sliding up and down. The valve sleeve 1 is provided with an elastic component 3, and the elastic component 3 is used to apply a downward elastic thrust to the valve core 2.

[0032] The valve sleeve 1 comprises an upper valve sleeve 11 and a lower valve sleeve 12, the upper valve sleeve 11 and the lower valve sleeve 12 are distributed up and down, the bottom end of the upper valve sleeve 11 abuts against the top end of the lower valve sleeve 12, a first cavity 13 is provided at the bottom of the upper valve sleeve 11, a second cavity 14 is provided at the bottom of the lower valve sleeve 12, the second cavity 14 extends to the bottom of the lower valve sleeve 12, a circular hole 15 is provided on the outer peripheral wall of the upper valve sleeve 11, and the circular hole 15 extends into the first cavity 13 A gasket 16 is arranged below the lower valve sleeve 12, a first spring 17 is arranged between the gasket 16 and the lower valve sleeve 12, two ends of the first spring 17 are respectively connected to the gasket 16 and the lower valve sleeve 12, the elastic force of the first spring 17 is smaller than the elastic force applied by the elastic component 3 to the valve core 2, the valve core 2 is sealed against the top end of the second cavity 14, a gap is arranged between the valve core 2 and the inner wall of the second cavity 14, and the valve core 2 passes through the gasket 16;

[0033] The valve core 2 comprises an adjusting portion 21, a sealing portion 22 and a pushing portion 23, wherein the adjusting portion 21, the sealing portion 22 and the pushing portion 23 are connected in sequence from top to bottom, the adjusting portion 21 is inserted into the first cavity 13 from the bottom of the upper valve sleeve 11, the adjusting portion 21 slides and is sealedly connected to the inner wall of the first cavity 13, the top of the sealing portion 22 is located in the first cavity 13, the bottom of the sealing portion 22 is located in the second cavity 14, the sealing portion 22 is sealed against the top end of the second cavity 14, the sealing portion 22 is truncated cone-shaped, the axis of the sealing portion 22 is arranged vertically, the large diameter end of the sealing portion 22 is arranged upward, the pushing portion 23 passes through the second cavity 14, a gap is provided between the pushing portion 23 and the inner wall of the second cavity 14, and the bottom end of the pushing portion 23 is located below the gasket 16;

[0034] The connection position between the sealing portion 22 and the adjusting portion 21 is located at the through hole;

[0035] A sealing ring 24 is provided at the connection between the pushing portion 23 and the inner wall of the third through hole 53, and the sealing ring 24 improves the sealing performance between the pushing portion 23 and the inner wall of the third through hole 53;

[0036] The elastic component 3 includes a spring seat 31 and a second spring 32, both of which are located in the first cavity 13. The spring seat 31, the second spring 32 and the valve core 2 are distributed from top to bottom. The two ends of the second spring 32 are connected to the spring seat 31 and the valve core 2 respectively. The elastic force of the second spring 32 is greater than the elastic force of the first spring 17. The second spring 32 is in a compressed state. The spring seat 31 is connected to a lifting unit 33, and the lifting unit 33 is used to realize the lifting of the spring seat 31.

[0037] The lifting unit 33 includes a screw 331 and a sealing nut 332. The screw 331 is vertically inserted into the upper valve sleeve 11. The screw 331 is threadedly connected to the upper valve sleeve 11. The top of the spring seat 31 abuts against the bottom of the screw 331. The sealing nut 332 is threadedly connected to the screw 331. The sealing nut 332 abuts against the top of the upper valve sleeve 11.

[0038] Loosen the sealing nut 332 and seal the screw 331 to make the screw 331 rise and fall. When the screw 331 moves downward, the spring seat 31 drives the second spring 32 to continue to compress. Then, through the elastic force on the valve core 2, when the screw 331 moves upward, the second spring 32 is extended to reduce the elastic force on the valve core 2.

[0039] The top of the spring seat 31 is spherical, which facilitates relative rotation between the screw 331 and the spring seat 31 and reduces the friction between the screw 331 and the spring seat 31;

[0040] The bottom of the upper valve sleeve 11 is provided with a blind hole 18, the top of the first spring 17 is inserted into the blind hole 18, and the first spring 17 is connected to the top of the blind hole 18;

[0041] Before use, the threaded cartridge valve is installed on the mounting seat 4. A stepped hole 5 is provided on the top of the mounting seat 4. The stepped hole 5 includes a first through hole 51, a second through hole 52, a third through hole 53 and a fourth through hole 54. The first through hole 51, the second through hole 52, the third through hole 53 and the fourth through hole 54 are distributed in sequence from top to bottom. The apertures of the first through hole 51, the second through hole 52, the third through hole 53 and the fourth through hole 54 decrease in sequence. During installation, the valve sleeve 1 is inserted from the top of the stepped hole 5, and the bottom of the gasket 16 abuts against the top of the second through hole 52, and the upper valve sleeve 11 is screwed to the inner wall of the first through hole 51, the outer wall of the upper valve sleeve 11 is sealed with the inner wall of the first through hole 51, and the lower valve sleeve 12 is sealed with the inner wall of the first through hole 51. A gap is set between the bottom of the lower valve sleeve 12 and the inner wall of the first through hole 51, and the lower valve sleeve 12 slides up and down and is sealed and connected. The push part 23 is inserted into the third through hole 53, and the push part 23 slides and is sealed and connected with the inner wall of the third through hole 53. The bottom end of the push part 23 abuts against the bottom of the third through hole 53. The mounting seat 4 is provided with an oil inlet 6 and an oil outlet 7, and the oil outlet 7 is located at the circular hole 15. The oil inlet 6 is communicated with the second through hole 52. The cavity in the oil inlet 6, the cavity in the second through hole 52, the cavity in the first through hole 51, the second cavity 14, the first cavity 13, the cavity in the circular hole 15 and the cavity in the oil outlet hole form an oil passage. At this time, because the sealing part 22 abuts against the top of the second cavity 14, the oil passage is in a closed state.

[0042] Working principle:

[0043] Under normal conditions, since the sealing portion 22 is sealed against the top of the second cavity 14, the hydraulic oil flows from the oil inlet 6 to the oil outlet 7 and is closed. When the liquid pressure in the oil inlet 6 is sufficient to overcome the elastic force of the second spring 32, the valve core 2 is pushed up and the sealing portion 22 is separated from the top of the second cavity 14. At this time, the hydraulic oil flows from the cavity in the oil inlet 6, the cavity in the second through hole 52, the cavity in the first through hole 51, the second cavity 14, the first cavity 13 and the cavity in the circular hole 15 to the cavity in the oil outlet hole in sequence, and the hydraulic oil in the oil outlet 7 is discharged. When the oil inlet 6 stops delivering the hydraulic oil, the elastic force of the second spring 32 causes the valve core 2 to descend and reset, that is, the sealing portion 22 is sealed against the top of the second cavity 14, so that the overflow effect is achieved.

[0044] A pilot pressure is applied to the fourth through hole 54, with a pilot ratio of 4:1, to push the valve core 2 upward, so that the sealing portion 22 is separated from the top end in the second cavity 14, thereby realizing pilot external control;

[0045] When reverse opening is required, the hydraulic oil enters the first cavity 13 from the cavity in the oil outlet 7 and the cavity in the circular hole 15 in turn, so that the pressure in the first cavity 13 increases. Under the action of pressure, because the elastic force of the first spring 17 is smaller than the elastic force of the second spring 32, the lower valve sleeve 12 is preferentially pushed down, the sealing portion 22 is separated from the top end in the second cavity 14, and the first spring 17 is deformed. The hydraulic oil in the first cavity 13 is discharged from the second cavity 14, the cavity of the first through hole 51, the cavity of the second through hole 52 and the cavity in the oil inlet 6 in turn to achieve reverse opening. When the oil outlet 7 stops inletting oil, the elastic force of the first spring 17 causes the lower valve sleeve 12 to rise and reset, that is, the sealing portion 22 is sealed against the top end of the second cavity 14. In addition, according to the following Figure 5-6 As shown, the pressure required for reverse opening is significantly lower than the pressure required for overflow, avoiding damage due to excessive pressure.

[0046] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A threaded cartridge valve, comprising a valve sleeve (1) and a valve core (2), wherein the valve core (2) is inserted from the bottom of the valve sleeve (1), the valve core (2) is connected to the valve sleeve (1) in an upward and downward sliding manner, and an elastic component (3) is provided on the valve sleeve (1), wherein the elastic component (3) is used to apply an elastic thrust downward to the valve core (2), and is characterized in that: The valve sleeve (1) comprises an upper valve sleeve (11) and a lower valve sleeve (12), wherein the upper valve sleeve (11) and the lower valve sleeve (12) are arranged vertically, wherein the bottom end of the upper valve sleeve (11) abuts against the top end of the lower valve sleeve (12), a first cavity (13) is arranged at the bottom of the upper valve sleeve (11), and a second cavity (14) is arranged at the bottom of the lower valve sleeve (12), wherein the second cavity (14) extends to the bottom of the lower valve sleeve (12), and a circular hole (15) is arranged on the outer peripheral wall of the upper valve sleeve (11), wherein the circular hole (15) extends into the first cavity (13). A gasket (16) is arranged below the lower valve sleeve (12), a first spring (17) is arranged between the gasket (16) and the lower valve sleeve (12), two ends of the first spring (17) are respectively connected to the gasket (16) and the lower valve sleeve (12), the elastic force of the first spring (17) is smaller than the elastic force applied by the elastic component (3) to the valve core (2), the valve core (2) and the top end of the second cavity (14) are sealed against each other, a gap is arranged between the valve core (2) and the inner wall of the second cavity (14), and the valve core (2) passes through the gasket (16).

2. A threaded cartridge valve according to claim 1, characterized in that: The valve core (2) comprises an adjusting portion (21), a sealing portion (22) and a pushing portion (23), wherein the adjusting portion (21), the sealing portion (22) and the pushing portion (23) are connected in sequence from top to bottom, wherein the adjusting portion (21) is inserted into the first cavity (13) from the bottom of the upper valve sleeve (11), wherein the adjusting portion (21) is slidably and sealingly connected to the inner wall of the first cavity (13), wherein the top of the sealing portion (22) is located in the first cavity (13), wherein the bottom of the sealing portion (22) is located in the second cavity (14), wherein the sealing portion (22) is sealed against the top end of the second cavity (14), wherein the pushing portion (23) passes through the second cavity (14), wherein a gap is provided between the pushing portion (23) and the inner wall of the second cavity (14), and wherein the bottom end of the pushing portion (23) is located below the gasket (16).

3. A threaded cartridge valve according to claim 2, characterized in that: The sealing portion (22) is in the shape of a truncated cone, the axis of the sealing portion (22) is arranged vertically, and the large diameter end of the sealing portion (22) is arranged upwards.

4. A threaded cartridge valve according to claim 2, characterized in that: A sealing ring (24) is provided at the connection between the pushing portion (23) and the inner wall of the third through hole (53).

5. A threaded cartridge valve according to claim 2, characterized in that: The connection position between the sealing portion (22) and the adjusting portion (21) is located at the through hole.

6. A threaded cartridge valve according to claim 1, characterized in that: The elastic force component (3) comprises a spring seat (31) and a second spring (32), the spring seat (31) and the second spring (32) are both located in the first cavity (13), the spring seat (31), the second spring (32) and the valve core (2) are arranged from top to bottom, the two ends of the second spring (32) are respectively connected to the spring seat (31) and the valve core (2), the elastic force of the second spring (32) is greater than the elastic force of the first spring (17), the second spring (32) is in a compressed state, and the spring seat (31) is connected to a lifting unit (33), the lifting unit (33) is used to realize the lifting and lowering of the spring seat (31).

7. A threaded cartridge valve according to claim 6, characterized in that: The lifting unit (33) comprises a screw (331) and a sealing nut (332), wherein the screw (331) is vertically inserted into the upper valve sleeve (11), the screw (331) is threadedly connected to the upper valve sleeve (11), the top of the spring seat (31) abuts against the bottom of the screw (331), the sealing nut (332) is threadedly connected to the screw (331), and the sealing nut (332) abuts against the top of the upper valve sleeve (11).

8. A threaded cartridge valve according to claim 7, characterized in that: The top of the spring seat (31) is spherical.

9. A threaded cartridge valve according to claim 1, characterized in that: A blind hole (18) is provided at the bottom of the upper valve sleeve (11), the top of the first spring (17) is inserted into the blind hole (18), and the first spring (17) is connected to the top of the blind hole (18).

10. A threaded cartridge valve according to claim 1, characterized in that: The outer surfaces of the valve sleeve (1) and the valve core (2) are both subjected to anti-corrosion treatment.

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