Multi-way valve with anti-backflow structure

Abstract

The utility model discloses a multi-way valve with an anti-backflow structure, which comprises multi-way valve bodies, a main valve body, a working oil port and an anti-backflow cover assembly, the front end face of each multi-way valve body is provided with an output port, the main valve body is arranged on the left side of the multi-way valve body, the front end face of each auxiliary valve body is provided with a safety valve, the rear end face of each multi-way valve body is provided with an input port, and the working oil port is arranged on the right side of the multi-way valve body. The working oil ports are formed in the upper end face of the multi-way valve body and the upper end face of the main valve body, and the anti-backflow cover assemblies are arranged above the seven sets of working oil ports respectively. According to the multi-way valve with the anti-backflow structure, through the double-seal design, it is ensured that leakage or backflow and overflow do not occur when a working oil port is in a maintenance stopping state, even if one seal fails, the other seal can still play a role in preventing backflow and overflow, oil leakage and pollution to the environment are avoided, and the service life of the multi-way valve is prolonged. The oil pressure in the pipeline is detected through the oil pressure sensor, the pressure condition of oil in the working oil port is monitored in real time, and pressure abnormity and backflow phenomena are found in time.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-way valves, in particular to a multi-way valve with an anti-backflow structure. Background Art

[0002] The reversing valve is a type of valve that changes the on-off relationship of the oil channel connected to the valve body by the relative movement between the valve core and the valve body. The multi-way reversing valve is a combination valve composed of two or more reversing valves. When used in automobile cranes, excavators, loaders, etc., it cannot play the role of monitoring internal noise and temperature. For this reason, we propose a hydraulic multi-way reversing valve.

[0003] For example, the patent document with application number 201821058944.4 discloses a hydraulic multi-way reversing valve, including a multi-way reversing valve body, a mounting box and a protective cover, wherein an LED lighting lamp is installed at one end of the top of the multi-way reversing valve body through a mounting seat, a mounting box is installed at one end of the multi-way reversing valve body through screws, a wireless transceiver module is arranged at the bottom of the mounting box through a mounting member, a temperature sensor is arranged at one end of the wireless transceiver module through a fixing member, a noise sensor is installed at one end of the temperature sensor through a mounting seat, a single-chip microcomputer is arranged at one end of the noise sensor through a fixing seat, a butt joint is arranged at one side of the multi-way reversing valve body, a slide rail is installed at the upper and lower ends of the butt joint through screws, and a protective cover is arranged at one end of the slide rail. The utility model hydraulic multi-way reversing valve has various functions and high practicality, and the overall device has broad application prospects and is suitable for wide promotion.

[0004] For a similar multi-way directional valve, when the valve body is working, the working oil port needs to be inspected inside the valve to connect to the inside of the valve body. When the flow is too large or the valve core is blocked, the oil pressure will inevitably be too high. As a result, when the oil pressure is too high, the seal inside the multi-way directional valve cannot fully withstand the high pressure, causing the oil to flow back from the seal of the valve body to the working oil port, causing the valve core to get stuck, the valve cannot be opened and closed normally, and even damage the hydraulic components.

[0005] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a multi-way valve with an anti-backflow structure is proposed. Utility Model Content

[0006] The utility model aims to provide a multi-way valve with an anti-backflow structure. When the valve body is working, since the working oil port needs to be inspected inside the valve to connect to the inside of the valve body, excessive oil pressure will inevitably occur when the flow is too large or the valve core is blocked. As a result, when the oil pressure is too high, the seal inside the multi-way reversing valve cannot fully withstand the high pressure, causing the oil to flow back from the seal of the valve body to the working oil port, thereby causing the valve core to become stuck, the valve cannot be opened and closed normally, and even damage the hydraulic components.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-way valve with an anti-backflow structure, comprising a multi-way valve body, a main valve body, a working oil port and an anti-backflow cover assembly, the front end surface of the multi-way valve body is provided with an output port, the multi-way valve body is provided with three groups, the main valve body is provided on the left side of the multi-way valve body, the right end surface of the multi-way valve body is provided with an auxiliary valve body, the front end surface of the auxiliary valve body is provided with a safety valve, the rear end surfaces of the three groups of multi-way valve bodies are provided with input ports, the working oil ports are provided on the upper end surfaces of the multi-way valve body and the main valve body, the working oil ports are provided in seven groups, the anti-backflow cover assemblies are respectively provided above the seven groups of working oil ports, the upper end of the inner surface of the working oil port is provided with an internal thread, the lower end of the inner surface of the working oil port is provided with a mounting groove, and a one-way valve is provided at the center of the upper end surface of each group of the multi-way valve bodies.

[0008] Furthermore, the anti-backflow cover assembly includes a sealing cover, a primary sealing ring, an external thread, a support rod, a secondary sealing ring and an oil pressure sensor. The sealing cover is arranged above the working oil port, a primary sealing ring is arranged at the lower end of the outer surface of the sealing cover, an external thread is arranged below the primary sealing ring, a support rod is arranged at the center of the lower end surface of the sealing cover, a secondary sealing ring is arranged on the outer surface of the support rod body, and an oil pressure sensor is arranged on the lower end surface of the support rod.

[0009] Furthermore, a primary sealing groove is provided at the edge of the working oil port, and the external thread and the internal thread are meshed with each other.

[0010] Furthermore, the primary sealing groove and the primary sealing ring are meshed with each other, and the mounting groove and the secondary sealing ring are abutted against each other.

[0011] Furthermore, the primary sealing ring and the secondary sealing ring are both made of rubber, and the outer surface of the blocking cover is bonded to the inner surface of the primary sealing ring.

[0012] Furthermore, the positions of the three groups of output ports are at the same level and correspond to each other, and the positions of the three groups of input ports are at the same level and correspond to each other.

[0013] Compared with the prior art, the utility model has the following beneficial effects: through such a double seal design, it is ensured that the working oil port will not leak or overflow in the state of stopping for maintenance. Even if one seal fails, the other seal can still play a role in preventing overflow and avoid oil leakage and environmental pollution. The oil pressure in the pipeline is detected by the oil pressure sensor, and the pressure of the oil in the working oil port is monitored in real time, and abnormal pressure and reverse flow are discovered in time. The specific contents are as follows:

[0014] A working oil port, a primary sealing groove, an internal thread, an external thread, an installation groove and an anti-backflow component are provided. The working oil port is sealed by a sealing cover in the anti-backflow component, and the external thread of the sealing cover is meshed with the internal thread at the working oil port to achieve a fixed connection. While being connected, the primary sealing ring is meshed with the primary sealing groove at its edge to perform a single seal on the working oil port to prevent oil from backflowing and overflowing from the working oil port. The secondary sealing ring at the lower end is then abutted against the surface of the installation groove to achieve a double seal, further enhancing the anti-backflow effect. The oil pressure in the pipeline is detected by an oil pressure sensor, and the oil pressure is monitored in real time to prevent oil backflow caused by a large pressure difference in the multi-way valve. When the oil pressure is detected to be abnormally beyond the threshold or backflow, the user is promptly reminded through the monitoring system alarm, and the pressure is released through the one-way valve 11 in the auxiliary valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional structural schematic diagram of a multi-way valve with an anti-backflow structure of the utility model;

[0016] Figure 2 It is a three-dimensional structural schematic diagram of an anti-backflow cover assembly of a multi-way valve with an anti-backflow structure according to the utility model;

[0017] Figure 3 It is a three-dimensional structural schematic diagram of a blocking cover of a multi-way valve with an anti-backflow structure according to the utility model;

[0018] Figure 4 The utility model is a multi-way valve with an anti-backflow structure Figure 1 Schematic diagram of the local enlarged structure at A in the figure.

[0019] In the figure: 1. multi-way valve body; 2. main valve body; 3. auxiliary valve body; 4. safety valve; 5. output port; 6. input port; 7. working oil port; 71. primary sealing groove; 8. anti-backflow cover assembly; 801. blocking cover; 802. primary sealing ring; 803. external thread; 804. support rod; 805. secondary sealing ring; 806. oil pressure sensor; 9. internal thread; 10. mounting groove; 11. one-way valve. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0021] like Figures 1 to 4As shown, a multi-way valve with an anti-backflow structure includes a multi-way valve body 1, a main valve body 2, a working oil port 7 and an anti-backflow cover assembly 8. The front end surface of the multi-way valve body 1 is provided with an output port 5. The positions of the three groups of output ports 5 are at the same level and correspond to each other. The multi-way valve body 1 is provided with three groups. The multi-way valve body 1 is connected to an external device through the output port 5 to output the fluid. The main valve body 2 is arranged on the left side of the multi-way valve body 1. The main valve body 2 is used to control the flow direction and pressure of the fluid and plays a major control role. The right end of the multi-way valve body 1 The auxiliary valve body 3 is provided on the front face of the auxiliary valve body 3, and the safety valve 4 is provided on the front face of the auxiliary valve body 3. When the system pressure exceeds the threshold, the auxiliary valve body 3 releases the pressure through the safety valve 4 to protect the safety of the equipment. The rear end faces of the three groups of multi-way valve bodies 1 are provided with input ports 6. The positions of the three groups of input ports 6 are at the same level and correspond to each other. The three groups of input ports 6 are used to receive fluids from external equipment. A one-way valve 11 is provided at the center of the upper end face of each group of multi-way valve bodies 1. The one-way valve 11 controls the one-way flow of the fluid, reduces the backflow phenomenon and maintains the fluid;

[0022] The working oil port 7 is arranged on the upper end surface of the multi-way valve body 1 and the main valve body 2. There are seven groups of working oil ports 7. The working oil port 7 is used to repair or replace parts of the multi-way valve so as to enter the working chamber for operation. By entering the working oil port 7, the status of the valve core, seals and other parts inside the multi-way valve body 1 and the main valve body 2 can be easily checked. The anti-backflow cover assembly 8 is respectively arranged above the seven groups of working oil ports 7. The anti-backflow cover assembly 8 includes a blocking cover 801, a primary sealing ring 802, an external thread 803, a support rod 804, a secondary sealing ring 805 and an oil pressure sensor 806. The blocking cover 801 is arranged above the working oil port 7. The blocking cover 801 is to seal the working oil port 7 to prevent In order to prevent oil leakage, improve its sealing performance, a primary sealing ring 802 is provided at the lower end of the outer surface of the plugging cover 801, and the outer surface of the plugging cover 801 is bonded to the inner surface of the primary sealing ring 802, and the primary sealing ring 802 is bonded to the plugging cover 801 to ensure that oil does not leak therefrom, and a primary sealing groove 71 is provided at the edge of the working oil port 7, and the primary sealing groove 71 and the primary sealing ring 802 are meshed with each other. The primary sealing groove 71 is meshed with the primary sealing ring 802 at the plugging cover 801, so that when the plugging cover 801 blocks the working oil port 7, leakage is avoided, and an external thread 803 is provided below the primary sealing ring 802. An internal thread 9 is provided at the upper end, and the external thread 803 meshes with the internal thread 9, and the external thread 803 of the plugging cover 801 meshes with the internal thread 9 at the working oil port 7, so that the plugging cover 801 is firmly fixed at the opening of the working oil port 7. When it needs to be disassembled for maintenance, the plugging cover 801 can be disassembled for maintenance and replacement by simply rotating it along the thread. A support rod 804 is provided at the center of the lower end surface of the plugging cover 801. The support rod 804 provides a supporting function for the parts. A secondary sealing ring 805 is provided on the outer surface of the rod body of the support rod 804. The secondary sealing ring 805 provides a double sealing effect to improve the sealing effect of the anti-backflow cover assembly 8. The lower end of the inner surface of the working oil port 7 is provided with The installation groove 10 and the secondary sealing ring 805 are abutted against each other. The secondary sealing ring 805 seals the pipeline of the working oil port 7 by abutting against the upper end of the installation groove 10. The primary sealing ring 802 and the secondary sealing ring 805 are both made of rubber. The rubber material can enable the anti-backflow cover assembly 8 to achieve a tight sealing effect. The lower end surface of the support rod 804 is provided with an oil pressure sensor 806. The oil pressure sensor 806 is used to detect the oil pressure in the inner cavity of the working oil port 7 to prevent the oil pressure from being too high and exceeding the set threshold to cause backflow leakage. When a problem is detected, a signal is sent to the monitoring system to remind the staff to repair it, and the pressure is released through the safety valve 4 of the auxiliary valve body 3.

[0023] In summary, if Figures 1 to 4As shown, in the multi-way valve with anti-backflow structure, the multi-way valve body 1 is connected to the equipment through the output port 5 and the input port 6 to work, the main valve body 2 controls the flow direction and pressure of the multi-way valve body 1, and the one-way valve 11 acts in the multi-way valve body 1 to reduce the backflow phenomenon during work, and the anti-backflow cover assembly 8 is controlled to be meshed and connected with the internal thread 9 on the inner surface of the working oil port 7 through the external thread 803 at the blocking cover 801. When the multi-way valve needs to be repaired, the staff rotates the blocking cover 801 and takes it out along the thread to check the internal valve core, sealing parts and other parts After maintenance and installation of the anti-backflow cover assembly 8, the primary sealing ring 802 engages with the primary sealing groove 71, thereby providing a seal when the blocking cover 801 is blocked. At the same time, the support rod 804 at the lower end of the blocking cover 801 drives the secondary sealing ring 805 to abut against the installation groove 10 below the working oil port 7, thereby performing a second seal. When the oil pressure sensor 806 detects that the oil pressure is too high and exceeds the threshold, it sends a signal to the monitoring system to remind the staff to perform maintenance, and controls the safety valve 4 of the auxiliary valve body 3 to release the pressure at the same time.

Claims

1. A multi-way valve with an anti-backflow structure, comprising a multi-way valve body (1), a main valve body (2), a working oil port (7) and an anti-backflow cover assembly (8), characterized in that: The front end face of the multi-way valve body (1) is provided with an output port (5), and the multi-way valve body (1) is provided with three groups. The main valve body (2) is provided on the left side of the multi-way valve body (1), and the right end face of the multi-way valve body (1) is provided with an auxiliary valve body (3). The front end face of the auxiliary valve body (3) is provided with a safety valve (4). The rear end faces of the three groups of multi-way valve bodies (1) are provided with input ports (6). The working oil ports (7) are provided on the upper end faces of the multi-way valve body (1) and the main valve body (2). There are seven groups of working oil ports (7). The anti-backflow cover assembly (8) is respectively provided above the seven groups of working oil ports (7). The upper end of the inner surface of the working oil port (7) is provided with an internal thread (9), and the lower end of the inner surface of the working oil port (7) is provided with a mounting groove (10). Each group of A one-way valve (11) is arranged at the center of the upper end surface of the multi-way valve body (1). The anti-backflow cover assembly (8) comprises a blocking cover (801), a primary sealing ring (802), an external thread (803), a support rod (804), a secondary sealing ring (805) and an oil pressure sensor (806). The blocking cover (801) is arranged above the working oil port (7). A primary sealing ring (802) is arranged at the lower end of the outer surface of the blocking cover (801). An external thread (803) is arranged below the primary sealing ring (802). A support rod (804) is arranged at the center of the lower end surface of the blocking cover (801). A secondary sealing ring (805) is arranged on the outer surface of the support rod (804), and an oil pressure sensor (806) is arranged on the lower end surface of the support rod (804).

2. A multi-way valve with an anti-backflow structure according to claim 1, characterized in that: A primary sealing groove (71) is provided at the edge of the working oil port (7), and the external thread (803) and the internal thread (9) are meshed with each other.

3. A multi-way valve with an anti-backflow structure according to claim 2, characterized in that: The primary sealing groove (71) and the primary sealing ring (802) are meshed with each other, and the mounting groove (10) and the secondary sealing ring (805) are in contact with each other.

4. The multi-way valve with anti-backflow structure according to claim 3, characterized in that: The primary sealing ring (802) and the secondary sealing ring (805) are both made of rubber, and the outer surface of the blocking cover (801) is bonded to the inner surface of the primary sealing ring (802).

5. The multi-way valve with anti-backflow structure according to claim 4, characterized in that: The positions of the three groups of output ports (5) are at the same level and correspond to each other, and the positions of the three groups of input ports (6) are at the same level and correspond to each other.

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