Low-pressure full-surrounding asymmetric planar hydraulic logic layout multi-way valve
By adding a high-pressure leakage collection path between the median oil return channel and the sealing structure, the impact problem of oil on the sealing structure in the prior art is solved, and the long life and low leakage effect of the sealing structure are achieved.
Patent Information
- Application Number
- CN202422192363.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-06
AI Technical Summary
In the asymmetric planar hydraulic logic layout of existing small construction machinery valves, the impact of oil on the sealing structure causes the seal to age and leak, which is difficult to effectively solve in the existing technology.
A high-pressure leakage oil collection path is added between the median oil return channel and the sealing structure. Through the coordination of the high-pressure leakage oil collection path and the sealing structure, the impact on the sealing structure is reduced, and the high-pressure oil liquid is converted into low-pressure oil liquid to reduce the risk of leakage.
It extends the service life of the sealing structure, reduces the risk of oil leakage, and the structural design is reasonable and simplified, reducing the impact risk of the sealing structure.
Smart Images
Figure CN223049115U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a multi-way directional control valve, in particular to a low-pressure fully surrounded asymmetric planar hydraulic logic layout multi-way valve. Background Art
[0002] The directional control valve used for fluid direction control in a hydraulic system is widely applied and has various types. According to the operation mode, it includes electric, hydraulic, electro-hydraulic, etc., and according to the valve structure, there are various forms such as spool valve and rotary valve. In the prior art, there is a small construction machinery valve with an asymmetric planar hydraulic logic layout for its internal oil circuit, and its pressure oil circuit is arranged at one end of the multi-way valve body. During use, the oil fluid impacts and damages the sealing structure, and when the seal starts to age, the multi-way valve begins to leak oil. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a low-pressure fully surrounded asymmetric planar hydraulic logic layout multi-way valve.
[0004] To solve the above technical problem, the technical solution of the utility model is: a low-pressure fully surrounded asymmetric planar hydraulic logic layout multi-way valve, including a valve body having an oil inlet passage P and an oil return passage T. At least two commutation chutes are arranged between the oil inlet passage P and the oil return passage T in the valve body, and a commutation valve rod is slidably arranged in the corresponding commutation chute. An oil inlet passage P, an oil return passage T, and a neutral oil return passage arranged near one end of the valve body are further arranged in the valve body. A sealing structure is arranged between the end of the valve body at the commutation chute and the commutation valve rod. The neutral oil return passage communicates with each commutation chute. One end of the neutral oil return passage is connected to the oil inlet passage P, and the other end of the neutral oil return passage is connected to the oil return passage T. A neutral external plug port is further arranged on the valve body between the neutral oil return passage and the oil return passage T, and a P1 external interface is arranged between the neutral oil return passage and the neutral external plug port. A high-pressure leakage collection oil circuit is arranged between the neutral oil return passage and the sealing structure at the end of the valve body on the valve body. The low-high pressure leakage collection oil circuit communicates with each commutation chute, and the high-pressure leakage collection oil circuit also communicates with the oil return passage T.
[0005] As a preferred technical solution, a low-pressure oil drain passage connected to the high-pressure leakage collection oil circuit is arranged on the valve body, and the low-pressure oil drain passage and the other end of the oil return passage T are communicated.
[0006] As a preferred technical solution, the middle oil return passage includes two middle oil return annular grooves provided in each of the reversing chutes. One middle oil return annular groove of two adjacent reversing chutes is connected through a connecting oil passage. The other middle oil return annular groove of the reversing chute at the forefront is connected to the oil inlet passage P, and the other middle oil return annular groove of the reversing chute at the rearmost is connected to the middle external plugging port and the P1 external interface.
[0007] As a preferred technical solution, the high-pressure leakage collection oil passage includes high-pressure leakage collection annular grooves provided in each of the reversing chutes. The high-pressure leakage collection annular grooves are located between the middle oil return passage and the sealing structure, and two adjacent high-pressure leakage annular grooves are connected through a connecting oil passage.
[0008] Due to the adoption of the above technical solution, the beneficial effects of the present utility model are as follows: By adding a high-pressure leakage collection oil passage between the middle oil return passage and the sealing structure, the high-pressure oil in the middle oil return passage can be separated from the sealing structure, which can reduce the impact on the sealing structure, extend the service life of the sealing structure, and reduce the risk of oil leakage. At the same time, even if low-pressure oil is squeezed to the sealing structure through the gap between the valve body and the valve stem, due to the small oil pressure, the sealing structure itself can meet the sealing requirements. Through the combined use of the high-pressure leakage collection oil passage and the sealing structure, the leakage risk can be significantly reduced. The high-pressure leakage collection oil passage also has the advantages of reasonable design and simplified structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The following drawings are only intended to illustrate and explain the present utility model schematically, and do not limit the scope of the present utility model.
[0010] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;
[0011] Figure 2 is a sectional view of an embodiment of the present utility model;
[0012] In the figure: 100 - oil inlet passage P; 200 - oil return passage T; 300 - valve body; 400 - reversing valve stem; 500 - middle oil return passage; 600 - sealing structure; 700 - middle external plugging port; 800 - P1 external interface; 900 - high-pressure leakage collection oil passage; 900a - low-pressure oil drain passage. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It is understood that those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the drawings and the description are illustrative in nature and not intended to limit the protection scope of the claims.
[0014] As Figure 1 and Figure 2 shown, a low-pressure fully surrounded asymmetric planar hydraulic logic layout multi-way valve includes a valve body 300 having an oil inlet passage P100 and an oil return passage T200. At least two commutation chutes are provided between the oil inlet passage P100 and the oil return passage T200 in the valve body 300, and commutation valve rods 400 are slidably disposed in the corresponding commutation chutes. An oil inlet passage P100, an oil return passage T200, and a neutral oil return passage 500 disposed near one end of the valve body 300 are further provided in the valve body 300. A sealing structure 600 is provided between the end of the valve body 300 at the commutation chute and the commutation valve rod 400. The neutral oil return passage 500 communicates with each of the commutation chutes. One end of the neutral oil return passage 500 is connected to the oil inlet passage P100, and the other end of the neutral oil return passage 500 is communicated with the oil return passage T200 and then communicated to the total oil return port T. A neutral external plug port 700 is further provided on the valve body 300 between the neutral oil return passage 500 and the oil return passage T200, and a P1 external interface 800 is provided between the neutral oil return passage 500 and the neutral external plug port 700. A high-pressure leakage collection oil passage 900 is provided on the valve body 300 between the neutral oil return passage 500 and the sealing structure 600 at the end of the valve body 300. The high-pressure leakage collection oil passage 900 communicates with each of the commutation chutes, and the high-pressure leakage collection oil passage 900 is also communicated to the oil return passage T200.
[0015] This embodiment is an integral multi-way commutation valve. At least two commutation valve rods 400 are provided on the valve body 300. Of course, the number of commutation valve rods 400 can be more. Refer to Figure 1 , three commutation valve rods 400 are provided in this multi-way commutation valve. When an additional flapper valve is needed, the P1 external interface 800 can be used for oil supply.
[0016] Refer to Figure 2 The multi-way commutation valve is also provided with a working oil port A, a working oil port B, and an A-port oil return passage T(A) and a B-port oil return passage T(B). The structures are all prior art and will not be described in detail here. Among them, the oil return passage T200 communicates with the A-port oil return passage T(A) and the B-port oil return passage T(B) and is communicated to the total oil return port T.
[0017] See Figure 2 , a low-pressure oil drain passage 900a connected to the high-pressure leakage collection oil passage 900 is provided on the valve body 300, and the other ends of the low-pressure oil drain passage 900a and the oil return passage T200 are communicated with each other.
[0018] See Figure 2 , the neutral oil return passage 500 includes two neutral oil return annular grooves provided in each of the commutation chutes, one neutral oil return annular groove of adjacent two commutation chutes is connected by a connecting oil passage, the other neutral oil return annular groove of the commutation chute at the forefront is connected to the oil inlet passage P100, and the other neutral oil return annular groove of the commutation chute at the rearmost is connected to the neutral external plugging port 700 and the P1 external interface 800.
[0019] See Figure 2 , the high-pressure leakage collection oil passage 900 includes high-pressure leakage collection annular grooves provided in each of the commutation chutes, the high-pressure leakage collection annular grooves are located between the neutral oil return passage 500 and the sealing structure 600, and adjacent two high-pressure leakage collection annular grooves are connected by a connecting oil passage.
[0020] The working principle of this embodiment is as follows:
[0021] When a valve disc needs to be added to the P1 external interface 800, the neutral external plugging port 700 is sealed by a plug. When each commutation valve rod 400 in the valve body 300 is in the neutral position, the oil fluid flows into the corresponding valve disc through the oil inlet passage P100, the neutral oil return passage 500, and the P1 external interface 800. At this time, the neutral oil return passage 500 is a high-pressure passage. Since there is a gap between the mating surface of the commutation valve rod 400 and the valve body 300, a small part of the oil fluid leaks into the high-pressure leakage collection oil passage 900 under the action of high pressure. Here, the high-pressure leakage collection oil passage 900 provides a buffer space for the oil fluid. After the high-pressure oil fluid enters the high-pressure leakage collection oil passage 900, it is depressurized and converted into low-pressure oil fluid. The oil fluid entering the high-pressure leakage collection oil passage 900 will enter the total oil return port T through the low-pressure oil drain passage 900a. There is no or only a small amount of oil fluid in the high-pressure leakage collection oil passage 900 that will be squeezed to the sealing structure 600 at the end through the mating gap between the commutation valve rod 400 and the valve body 300. Since the oil fluid is at low pressure at this time, the sealing structure 600 can meet the sealing requirements. At the same time, the low-pressure oil fluid avoids the impact on the sealing structure 600 and prolongs the service life of the sealing structure 600. The combined design of the sealing structure 600 and the high-pressure leakage collection oil passage 900 can significantly reduce the leakage risk.
[0022] When the external valve disc is not required, the P1 external interface 800 is sealed with a plug, and the neutral external drain port 700 is not blocked. When each reversing valve rod 400 in the valve body 300 is in the neutral position, the oil fluid flows through the oil inlet channel P100, the neutral oil return channel 500, the neutral external drain port 700, and the oil return channel into the total oil return port T. At this time, the neutral oil return channel 500 is a low-pressure channel, and a small amount of the low-pressure oil fluid in the neutral oil return channel 500 may enter the high-pressure leakage collection oil circuit 900, accumulate in the high-pressure leakage collection oil circuit 900 and be discharged through the total oil return T, further reducing the leakage risk.
[0023] When the multi-way valve needs to perform a reversing operation, each reversing valve rod 400 in the valve body 300 acts to cut off the neutral oil return channel 500 from the total oil return port T. At this time, the neutral oil return channel 500 changes from a low-pressure channel to a high-pressure channel. Due to the gap between the reversing valve rod 400 and the mating surface of the valve body 300, a small part of the oil fluid leaks to the high-pressure leakage collection oil circuit 900 under the action of high pressure. Here, the high-pressure leakage collection oil circuit 900 provides a buffer space for the oil fluid. After the high-pressure oil fluid enters the high-pressure leakage collection oil circuit 900, it is depressurized to become low-pressure oil fluid, and the oil fluid entering the high-pressure leakage collection oil circuit 900 will enter the total oil return port T through the low-pressure oil drain channel 900a. There is no or only a small amount of the low-pressure oil fluid in the high-pressure leakage collection oil circuit 900 that will be squeezed to the end sealing structure 600 through the mating gap between the reversing valve rod 400 and the valve body 300. Since the oil fluid is at low pressure at this time, the sealing structure 600 can meet the sealing requirements. At the same time, the low-pressure oil fluid avoids the impact on the sealing structure 600 and extends the service life of the sealing structure 600. The combined design of the sealing structure 600 and the high-pressure leakage collection oil circuit 900 can significantly reduce the leakage risk.
[0024] The asymmetric planar hydraulic logic layout is a structural feature of a small construction machinery valve in the prior art. The neutral oil return channel is arranged at one end of the multi-way valve body, and the oil channels in the valve are single-layer cores. This type of multi-way valve with an asymmetric planar hydraulic logic layout has a risk of leakage. To solve this problem, the present utility model provides a high-pressure leakage collection oil circuit 900, and connects the high-pressure leakage collection oil circuit 900, the low-pressure oil drain channel 900a, and the oil return channel T200 to form a low-pressure full-loop oil circuit, forming a multi-way valve with a low-pressure full-loop asymmetric planar hydraulic logic layout.
[0025] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. A low-pressure full-surround asymmetric planar hydraulic logic layout multi-way valve, comprising a valve body with an oil inlet channel P and an oil return channel T, wherein at least two reversing slides and a reversing valve stem slidably arranged in the corresponding reversing slides are arranged in the valve body between the oil inlet channel P and the oil return channel T, and the valve body is also provided with an oil inlet channel P, an oil return channel T and a mid-position oil return channel arranged near one end of the valve body, and a sealing structure is arranged at the end of the valve body between the reversing slide and the reversing valve stem, the mid-position oil return channel communicates with each of the reversing slides, one end of the mid-position oil return channel is connected to the oil inlet channel P, and the other end of the mid-position oil return channel is connected to the oil return channel T, characterized in that: The valve body is also provided with a mid-position external plugging port located between the mid-position oil return channel and the oil return channel T and a P1 external interface located between the mid-position oil return channel and the mid-position external plugging port. A high-pressure leakage collection oil circuit is provided on the valve body between the mid-position oil return channel and the sealing structure at the end of the valve body. The high-pressure leakage collection oil circuit is connected to each of the reversing slide grooves, and the high-pressure leakage collection oil circuit is also connected to the oil return channel T.
2. A low-pressure all-around asymmetric planar hydraulic logic layout multi-way valve as claimed in claim 1, characterized in that: The valve body is provided with a low-pressure oil leakage passage connected to the high-pressure leakage collection oil circuit, and the low-pressure oil leakage passage is communicated with the other end of the oil return passage.
3. A low-pressure all-around asymmetric planar hydraulic logic layout multi-way valve as claimed in claim 1, characterized in that: The median oil return channel includes two median oil return ring grooves arranged in each of the reversing slide grooves. The median oil return ring grooves of each of the two adjacent reversing slide grooves are connected by a connecting oil circuit. The other median oil return ring groove of the frontmost reversing slide groove is connected to the oil inlet channel P, and the other median oil return ring groove of the rearmost reversing slide groove is connected to the median external plugging port and the P1 external interface.
4. A low-pressure all-around asymmetric planar hydraulic logic layout multi-way valve as claimed in claim 1, characterized in that: The high-pressure leakage collection oil circuit includes a high-pressure leakage collection annular groove arranged in each of the reversing slide grooves, and the high-pressure leakage collection annular groove is located between the mid-position oil return channel and the sealing structure. Two adjacent high-pressure leakage collection annular grooves are connected by a connecting oil circuit.