A valve core structure of a reversing valve

Abstract

The present invention relates to a reversing valve core structure, comprising a cylinder 1, a cylinder 2 and a cylinder 3 are respectively arranged on the left and right sides of the cylinder 1, a cylinder 4 and a cylinder 5 are respectively arranged between the cylinder 2, the cylinder 3 and the cylinder 1, the end faces of the cylinder 2 and the cylinder 3 protrude a section of the cylinder 6 and the cylinder 7 outward respectively, the left and right sides of the cylinder 1 are respectively provided with a radially penetrating oil hole 1 and an oil hole 2, the cylinder 2 and the cylinder 3 are respectively provided with a radially penetrating oil hole 3 and an oil hole 4, the cylinder 6 is axially provided with an oil hole 5, the cylinder 7 is axially provided with an oil hole 6, and four annular oil grooves are arranged at the intersection positions of the oil holes 1, 2, 3, 4 and the cylindrical surfaces of the cylinders 1, 2 and 3; the present invention can prevent the hydraulic oil on the high-pressure oil port side from leaking into the working oil port, so that the actuator connected to the working oil port will not be affected in the current state by the hydraulic oil leaking inside.

Description

[Technical field]

[0001] The invention relates to the technical field of hydraulic components, in particular to a valve core structure of a reversing valve. [Background Technology]

[0002] As a hydraulic component that controls the on-off and reversing of oil circuits, the reversing valve is widely used. The common reversing valve is a sliding valve structure, and its valve core slides in the valve body. By switching the valve core, different oil ports are connected or closed. However, since the valve core and the valve body are in sliding fit, the hydraulic oil on the high-pressure oil port side will leak to the low-pressure oil port side through the gap of the sliding surface. If the low-pressure oil port side is connected to an actuator, as the leaked hydraulic oil continues to accumulate, the existing position of the actuator will be changed. Therefore, this is not applicable to occasions where the actuator has strict position requirements. [Summary of the invention]

[0003] The purpose of the present invention is to solve the above-mentioned deficiencies and provide a reversing valve core structure, which can prevent the hydraulic oil on the high-pressure oil port side from leaking to the working oil port, so that the actuator connected to the working oil port will not be affected by the internal leakage of hydraulic oil.

[0004] In order to achieve the above-mentioned purpose, a reversing valve core structure is designed, including a cylinder 1 arranged in the middle part, the left and right sides of the cylinder 1 are respectively connected to the cylinder 2 and the cylinder 3 3, a cylinder 4 4 is arranged between the cylinder 2 2 and the cylinder 1, a cylinder 5 5 is arranged between the cylinder 3 3 and the cylinder 1, the diameters of the cylinder 4 4 and the cylinder 5 5 are both smaller than the diameter of the cylinder 1, the end face 1 21 of the cylinder 2 2 protrudes a section of cylinder 6 6 outward, the end face 2 31 of the cylinder 3 3 protrudes a section of cylinder 7 7 outward, the diameters of the cylinder 6 6 and the cylinder 7 7 are both smaller than the diameter of the cylinder 1, and the left and right sides of the cylinder 1 are respectively provided with a radially penetrating oil hole 1 1 and oil hole two 12, radially penetrating oil hole three 22 is arranged on the cylinder two 2, radially penetrating oil hole four 32 is arranged on the cylinder three 3, the cylinder six 6 is axially provided with oil hole five 61, the oil hole five 61 penetrates the oil hole one 11 and the oil hole three 22, the cylinder seven 7 is axially provided with oil hole six 71, the oil hole six 71 penetrates the oil hole two 12 and the oil hole four 32, annular oil groove one 13 and annular oil groove two 14 are respectively arranged at the intersection of the oil hole one 11, the oil hole two 12 and the cylindrical surface of the cylinder one 1, annular oil groove three 23 is arranged at the intersection of the oil hole three 22 and the cylindrical surface of the cylinder two 2, and annular oil groove four 33 is arranged at the intersection of the oil hole four 32 and the cylindrical surface of the cylinder three 3.

[0005] Furthermore, the diameters of the cylinder 2 2 and the cylinder 3 3 are the same as the diameter of the cylinder 1 , and the lengths of the cylinder 2 2 and the cylinder 3 3 are shorter than the length of the cylinder 1 1 .

[0006] Furthermore, a spring supporting step 1 8 is provided on the outer circumference of the cylinder 6 6 , and a spring supporting step 2 9 is provided on the outer circumference of the cylinder 7 7 .

[0007] Furthermore, the outer ends of the oil hole five 61 and the oil hole six 71 are provided with a first bulkhead 62 and a second bulkhead 72 respectively.

[0008] Furthermore, the cylinder 1, cylinder 2, cylinder 3, cylinder 4, cylinder 5, cylinder 6, cylinder 7, spring support step 1, and spring support step 2, 9 are coaxial integrated structures.

[0009] Compared with the prior art, the present invention has a novel and simple structure and a reasonable design. By improving the structure and design, the leaked oil on the high-pressure oil port side can flow back to the T port of the valve body through the oil hole set on the valve core instead of directly flowing to the working oil port. In this way, the actuator connected to the working oil port will not be affected by the internal leakage of hydraulic oil. Therefore, the present invention is very suitable for occasions where there are requirements for the position of the actuator, and is worthy of popularization and application. [Drawings]

[0010] Figure 1 It is a schematic diagram of the structure of the present invention;

[0011] Figure 2 yes Figure 1 Schematic diagram of the local structure;

[0012] Figure 3 yes Figure 2 The enlarged structural diagram of position Ⅰ in the middle;

[0013] Figure 4 This is a schematic diagram of the application structure of the present invention. Figure 1 ;

[0014] Figure 5 yes Figure 4 The enlarged structural diagram of the middle part Ⅱ;

[0015] Figure 6 This is a schematic diagram of the application structure of the present invention. Figure 2 ;

[0016] In the figure: 1, cylinder 11, oil hole 1 12, oil hole 2 13, annular oil groove 1 14, annular oil groove 2 2, cylinder 2 21, end face 1 22, oil hole 3 23, annular oil groove 3 3, cylinder 3 31, end face 2 32, oil hole 4 33, annular oil groove 4 4, cylinder 4 5, cylinder 5 6, cylinder 6 61, oil hole 5 62, blind head 1 7, cylinder 7 71, oil hole 6 72, blind head 2 8, spring support step 1 9, spring support step 2 100, valve core 101, valve body 102, cover 103, spring 1 104, spring 2 105, spring supported. [Specific implementation method]

[0017] The present invention is further described below in conjunction with the accompanying drawings:

[0018] As attached Figure 1 As shown, the present invention provides a reversing valve core structure, including a cylinder 1 arranged in the middle part, a cylinder 2 2 and a cylinder 3 3 are connected to the left and right sides of the cylinder 1 respectively, the diameters of the cylinder 2 2 and the cylinder 3 3 are the same as the diameter of the cylinder 1, and the lengths of the cylinder 2 2 and the cylinder 3 3 are both smaller than the length of the cylinder 1, a cylinder 4 4 is arranged between the cylinder 2 2 and the cylinder 1 1, a cylinder 5 5 is arranged between the cylinder 3 3 and the cylinder 1 1, the diameters of the cylinder 4 4 and the cylinder 5 5 are both smaller than the diameter of the cylinder 1 1, the end face 1 21 of the cylinder 2 2 protrudes a section of the cylinder 6 6 outward, the end face 2 31 of the cylinder 3 3 protrudes a section of the cylinder 7 7 outward, and the diameters of the cylinder 6 6 and the cylinder 7 7 are both smaller than the diameter of the cylinder 1 The diameter of the cylinder 1 is, the left and right sides of the cylinder 1 are respectively provided with a radially penetrating oil hole 11 and an oil hole 2 12, the cylinder 2 2 is provided with a radially penetrating oil hole 3 22, the cylinder 3 3 is provided with a radially penetrating oil hole 4 32, the cylinder 6 6 is axially provided with an oil hole 5 61, the oil hole 5 61 penetrates the oil hole 11 and the oil hole 3 22, the cylinder 7 7 is axially provided with an oil hole 6 71, the oil hole 6 71 penetrates the oil hole 2 12 and the oil hole 4 32, an annular oil groove 13 and an annular oil groove 2 14 are respectively provided at the intersection of the oil hole 11, the oil hole 2 12 and the cylindrical surface of the cylinder 1, an annular oil groove 3 23 is provided at the intersection of the oil hole 3 22 and the cylindrical surface of the cylinder 2, and an annular oil groove 4 33 is provided at the intersection of the oil hole 4 32 and the cylindrical surface of the cylinder 3 3.

[0019] Among them, the outer circumference of cylinder six 6 is provided with a spring supporting step one 8, and the outer circumference of cylinder seven 7 is provided with a spring supporting step two 9; the outer ports of oil hole five 61 and oil hole six 71 are respectively provided with a blind head one 62 and a blind head two 72; cylinder one 1, cylinder two 2, cylinder three 3, cylinder four 4, cylinder five 5, cylinder six 6, cylinder seven 7, spring supporting step one 8, and spring supporting step two 9 are coaxial integrally designed as an integrated structure.

[0020] The valve core structure described in the present invention is specifically as follows: a cylinder 1 with a diameter of D and a length of L is arranged in the middle part thereof, and a cylinder 2 and a cylinder 3 with a diameter of D and a length less than L are arranged on the left and right sides thereof respectively; a cylinder 4 4 and a cylinder 5 5 with a diameter less than D are arranged between the cylinder 1, the cylinder 2, and the cylinder 3 to connect; an end face 1 21 of the cylinder 2 2 protrudes a section of a cylinder 6 6 with a diameter less than D; an end face 2 31 of the cylinder 3 3 protrudes a section of a cylinder 7 7 with a diameter less than D; a spring support step 1 8 is arranged on the cylinder 6 6, and a spring support step 2 9 is arranged on the cylinder 7 7. The left and right sides of the cylinder 1 are respectively provided with radially penetrating oil hole 11 and oil hole 2 12, the cylinder 2 2 is provided with radially penetrating oil hole 3 22, and the cylinder 3 3 is provided with radially penetrating oil hole 4 32; the axially arranged oil hole 5 61 of the cylinder 6 6 penetrates the oil hole 11 and the oil hole 3 22; the axially arranged oil hole 6 71 of the cylinder 7 7 penetrates the oil hole 2 12 and the oil hole 4 32; the oil hole 5 61 and the oil hole 6 71 are blocked by a blind head 1 62 and a blind head 2 72 respectively; four annular oil grooves are provided at the intersection of the oil hole 11, the oil hole 2 12, the oil hole 3 22, the oil hole 4 32 and the cylindrical surfaces of the cylinder 1, the cylinder 2, and the cylinder 3.

[0021] As attached Figure 4 and attached Figure 5The figure shows a schematic diagram of the application structure of the valve core structure of the present invention. The valve core is installed in the axial cavity of the valve body and can slide left and right; the P port of the valve body is connected to the hydraulic source, the A / B port of the valve body is connected to the differential cylinder, and the T port of the valve body is connected to the oil tank; when there is no external force such as electromagnetic force and hydraulic pressure at both ends of the valve core, the valve core is in a neutral position under the action of spring 1 and spring 2, and the oil ports P / A / B / T are blocked at this time; when the P port is connected to the high-pressure oil source, since the valve core and the valve body are in sliding fit, there is a very small axial gap between the sliding surfaces of the valve core and the valve body, and a small amount of hydraulic oil will leak out through the gap; since the valve core structure of the present invention is specially designed, a small amount of hydraulic oil will leak into the annular oil groove 13 and 14 of the valve core through the axial gap. In the annular oil groove 2 14, the hydraulic oil in the annular oil groove 1 13 flows out through the radial oil hole 1 1, the axial oil hole 5 61, and the radial oil hole 3 22, and flows into the oil tank through the T port; similarly, the hydraulic oil in the annular oil groove 2 14 flows out through the radial oil hole 2 12, the axial oil hole 6 71, and the radial oil hole 4 32, and flows into the oil tank through the T port; in this way, due to the axial clearance, the high-pressure hydraulic oil at the P port flows back to the oil tank through the oil hole set inside the valve core, and will not leak to the A / B oil port of the valve body, so that the position of the differential cylinder connected to the A / B oil port will not change, which is very suitable for occasions with strict requirements on the cylinder stop position.

[0022] As attached Figure 6 As shown, when the left side of the valve core is subjected to a hydraulic pressure or electromagnetic force, the valve core moves to the right; at this time, the oil circuit is P→A, B→T, driving the differential cylinder to actuate; at the same time, the hydraulic oil will communicate through the radial oil hole 11, the axial oil hole 5 61 and the radial oil hole 3 22 of the valve core; since the radial oil hole 3 22 is located between the annular sliding surfaces of the valve body, and a blind head 62 is provided on the left side of the axial oil hole 5 61, the hydraulic oil at the P port will not flow directly back to the oil tank through the radial oil hole 11, the axial oil hole 5 61 and the radial oil hole 3 22 of the valve core, thereby not affecting the flow and pressure required to drive the differential cylinder.

[0023] When the right side of the valve core is subjected to a hydraulic pressure or electromagnetic force, the valve core moves to the left and works in the same way as above.

[0024] The present invention is not limited to the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A reversing valve core structure, characterized in that: The invention comprises a cylinder 1 (1) arranged in the middle part, a cylinder 2 (2) and a cylinder 3 (3) are connected to the left and right sides of the cylinder 1 (1) respectively, a cylinder 4 (4) is arranged between the cylinder 2 (2) and the cylinder 1 (1), a cylinder 5 (5) is arranged between the cylinder 3 (3) and the cylinder 1 (1), and the diameters of the cylinder 4 (4) and the cylinder 5 (5) are both smaller than those of the cylinder 1 (1). The end face 1 (21) of the cylinder 2 (2) protrudes outwardly into a section of the cylinder 6 (6), and the end face 2 (31) of the cylinder 3 (3) protrudes outwardly into a section of the cylinder 7 (7), the diameters of the cylinder 6 (6) and the cylinder 7 (7) are both smaller than the diameter of the cylinder 1 (1), and the left and right sides of the cylinder 1 (1) are respectively provided with a radially penetrating oil hole 1 (11) and an oil hole 2 (12), the The second cylinder (2) is provided with a radially penetrating oil hole three (22), the third cylinder (3) is provided with a radially penetrating oil hole four (32), the sixth cylinder (6) is provided with an axially arranged oil hole five (61), the oil hole five (61) penetrates the first oil hole (11) and the third oil hole (22), the seventh cylinder (7) is provided with an axially arranged oil hole six (71), the oil hole six (71) penetrates the second oil hole (12) and the fourth oil hole ( 32) penetrates through, an annular oil groove 1 (13) and an annular oil groove 2 (14) are respectively arranged at the intersection of the oil hole 1 (11) and the oil hole 2 (12) with the cylindrical surface of the cylinder 1 (1), an annular oil groove 3 (23) is arranged at the intersection of the oil hole 3 (22) with the cylindrical surface of the cylinder 2 (2), and an annular oil groove 4 (33) is arranged at the intersection of the oil hole 4 (32) with the cylindrical surface of the cylinder 3 (3).

2. The reversing valve core structure according to claim 1, characterized in that: The diameters of the second cylinder (2) and the third cylinder (3) are the same as the diameter of the first cylinder (1), and the lengths of the second cylinder (2) and the third cylinder (3) are shorter than the length of the first cylinder (1).

3. The reversing valve core structure according to claim 2, characterized in that: The outer circumference of the cylinder six (6) is provided with a spring support step one (8), and the outer circumference of the cylinder seven (7) is provided with a spring support step two (9).

4. The reversing valve core structure according to claim 3, characterized in that: The outer ends of the oil hole five (61) and the oil hole six (71) are respectively provided with a first bulkhead (62) and a second bulkhead (72).

5. The reversing valve core structure according to claim 4, characterized in that: The cylinder 1 (1), the cylinder 2 (2), the cylinder 3 (3), the cylinder 4 (4), the cylinder 5 (5), the cylinder 6 (6), the cylinder 7 (7), the spring support step 1 (8) and the spring support step 2 (9) are coaxial integrated structures.

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