A two-position four-way valve for a space fluid circuit

Abstract

The application discloses a two-position four-way valve for a space fluid circuit, which has two valve position states of main path communication and bypass path communication, comprises four liquid path interfaces of a main inlet, a main outlet, a bypass inlet and a bypass outlet, a valve cover, a valve core assembly, a valve body and a driving mechanism connected with the valve core, a flow limiting boss is arranged on the valve core, the flow resistance is consistent in the two valve position states of the main path communication and the bypass path communication, and the system working pressure and flow are stable; the two-position four-way valve has a reverse pressure relief function, and the bypass pressure is safe.

Description

Technical Field

[0001] This invention relates to the field of fluid circuit design, and in particular to a valve for controlling the on / off state of a branch in a spatial fluid circuit. Background Technology

[0002] The distributed fluid loop system consists of a main pipeline and several branches, each connected to a heat dissipation load. When a branch has no load installed, needs to be removed for maintenance, or experiences a working fluid leak, the branch must be closed to avoid affecting other heat dissipation loads, and the working fluid flows entirely through the main pipeline. When a branch has a load requiring heat dissipation, the corresponding main pipeline is shut off, and the working fluid flows entirely through that branch to dissipate heat from the load. Furthermore, regardless of whether the working fluid flows through a branch or the main pipeline, the system's flow resistance should remain consistent to ensure stable system pressure and flow rate. Additionally, when a branch is closed, the pressure increase caused by the thermal expansion of the working fluid within the heat dissipation load connected to that branch should be released through the valve's pressure relief function, while simultaneously maintaining the branch's closed state.

[0003] The current conventional design method involves installing valves at the inlet and outlet of each branch and on the main line, requiring a total of three valves. The flow path of the working fluid is switched by opening and closing these three valves. When there are many branches, this conventional design method requires numerous valves to control the on / off state of each branch, resulting in problems such as high system weight and power consumption, difficult layout, complex control, and poor reliability. While the four-way valve, widely used in air conditioning and oxygen generators, can replace the branch switching function of the three valves mentioned above with a single four-way valve, it cannot solve problems such as main / bypass flow resistance matching and reverse pressure relief. Summary of the Invention

[0004] This disclosure provides a two-position four-way valve for a spatial fluid circuit used for branch on / off control, which can effectively solve problems such as main / bypass flow resistance matching and reverse pressure relief.

[0005] The two-position four-way valve disclosed herein includes four hydraulic ports: a main inlet, a main outlet, a bypass inlet, and a bypass outlet. The main inlet connects to the upstream of the main pipeline, the main outlet connects to the downstream of the main pipeline, the bypass inlet connects to the upstream of a branch pipeline, and the bypass outlet connects to the downstream of the branch pipeline. It includes a valve cover, a valve core assembly, a valve body, and a drive mechanism connected to the valve core assembly.

[0006] The drive mechanism drives the valve core assembly to move up and down, achieving two valve position states: main line open valve position and bypass open valve position. In the main line open valve position, the valve core assembly is driven to move downward, so that the vulcanized sealing ring on the valve core assembly is pressed against the valve cover and locked, closing the bypass inlet and bypass outlet flow channels. The fluid working medium flows in from the main inlet and flows out directly from the main outlet without flowing through the branch.

[0007] When the bypass valve is in position, the valve core assembly is driven to move upward, causing the vulcanized sealing ring on the valve core assembly to separate from the valve cover and lock in the state. The bypass inlet and bypass outlet flow channels are opened, and the working fluid flows in from the main inlet, enters the branch and the connected heat dissipation load through the bypass inlet, flows back to the four-way valve through the bypass outlet, and then flows out from the main outlet. In this state, the liquid working fluid flows through the branch and the extended load connected to it, providing heat dissipation support for the load.

[0008] In one embodiment, a flow-limiting boss is provided on the valve core. The size design of the flow-limiting boss ensures that the flow resistance is the same in both the main and bypass valve positions of the four-way valve, thereby ensuring stable system working pressure and flow.

[0009] In one embodiment, a bypass valve position is provided, and a gate-type structure is provided between the main inlet and the main outlet to prevent cross-flow of the working fluid between the bypass inlet and the bypass outlet.

[0010] In one implementation, the reverse pressure relief function is achieved through the design of the magnetic force and the structural dimensions of the valve core and valve seat. That is, when the main line is in the valve position, if the bypass pressure is higher than the main line pressure and the pressure difference exceeds a certain threshold, the valve core will open slightly momentarily while keeping the valve position unchanged. This allows the bypass pressure to be relieved to the normal working pressure and then continue to be sealed to ensure the safety of the bypass pressure.

[0011] In one embodiment, a non-metallic bushing is designed between the valve core gate structure and the valve cover to reduce the frictional resistance between the gate and the valve cover when the valve core moves, thereby improving the service life.

[0012] In one embodiment, the valve core assembly's drive mechanism employs an electromagnet assembly.

[0013] In one embodiment, a bit display device and an electrical connector are also included.

[0014] The advantages of this invention compared to the prior art are:

[0015] 1) By replacing the original three valves with the switching of two valve positions of one valve, the system layout can be compacted, the system weight can be reduced by 50%, the system power consumption can be reduced by 67%, the control difficulty and the complexity of the control system can be significantly reduced, and the system reliability can be improved.

[0016] 2) The flow resistance is the same in both the main circuit and bypass circuit valve positions, ensuring stable system working pressure and flow rate;

[0017] 3) Bypass valve position, a gate-type structure is provided between the main inlet and the main outlet to cut off the flow and prevent cross-flow of working fluid between the bypass inlet and the bypass outlet;

[0018] 4) It has a reverse pressure relief function to ensure the safety of bypass pressure;

[0019] 5) Non-metallic bushings reduce the frictional resistance between the gate and the valve seat during valve core movement, thus improving operating life;

[0020] 6) It can display the valve position status in real time. Attached Figure Description

[0021] The above and other objects, features and advantages of this disclosure will become more apparent from the more detailed description of exemplary embodiments of this disclosure taken in conjunction with the accompanying drawings, in which the same reference numerals generally represent the same components.

[0022] Figure 1 This is a schematic diagram of the main valve position of a two-position four-way valve for a space fluid circuit according to the present invention, wherein 1-side inlet, 2-valve cover, 3-valve core assembly, 4-valve body, 5-main inlet, 6-electromagnet assembly, 7-position display device, 8-electrical connector, 9-main outlet, 10-bushing, 11-side outlet.

[0023] Figure 2 This is a schematic diagram of the bypass valve position of a two-position four-way valve for a space fluid circuit according to the present invention. The reference numerals represent the components and... Figure 1 same.

[0024] Figure 3 This is a schematic diagram of the valve core structure of a two-position four-way valve for a space fluid circuit according to the present invention, wherein 1-gate plate, 2-flow limiting boss. Detailed Implementation

[0025] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0026] The following is in conjunction with the appendix Figure 1 Appendix Figure 2 and attached Figure 3 The present invention will be further described below.

[0027] This disclosure provides a two-position four-way valve for a space fluid circuit, including: valve cover, valve core assembly, valve body, valve core drive mechanism and other components, having four fluid passage interfaces: main inlet, main outlet, bypass inlet and bypass outlet, and two valve position states: main passage open and bypass passage open.

[0028] An exemplary two-position four-way valve according to this disclosure, as shown in the appendix Figure 1-3As shown, the main components include: a valve cover 2 and a valve body 4 connected by a flange to form the external structure of the valve. A valve core assembly 3 is used for switching the flow path of the working fluid. An electromagnet assembly 6 is used to drive the movement of the valve core assembly. Preferably, it also includes: a position display device 7, which converts the valve core position into a voltage signal for monitoring the valve core position, i.e., the valve position status; and an electrical connector 8, used for powering the electromagnet assembly and powering and signal acquisition of the position display device. A bushing 10 is used to separate the flow channels of the bypass inlet 1 and the bypass outlet 11.

[0029] This two-position four-way valve includes four hydraulic ports: main inlet 5, main outlet 9, bypass inlet 1, and bypass outlet 11. Main inlet 5 connects to the upstream of the main pipeline, main outlet 9 connects to the downstream of the main pipeline, bypass inlet 1 connects to the upstream of the bypass expansion port, and bypass outlet 11 connects to the downstream of the bypass expansion port.

[0030] This two-position four-way valve achieves two valve position states by driving the valve core assembly 3 through the electromagnet assembly 6: main line open valve position and bypass open valve position.

[0031] 1) Main line through valve position, as shown in the attached document. Figure 1 As shown, the electromagnet assembly 6 drives the valve core assembly 3 to move downward, so that the vulcanized sealing ring on the valve core assembly 3 is pressed against the valve cover 2 and locked, closing the flow channels of the side inlet 1 and the side outlet 11. The fluid working medium flows in from the main inlet 5 and flows out directly from the main outlet 9 without flowing through the branch.

[0032] 2) Bypass valve position, as shown in the attached document. Figure 2 As shown, the electromagnet assembly 6 drives the valve core assembly 3 to move upward, causing the vulcanized sealing ring on the valve core assembly 3 to separate from the valve cover 2 and lock in the state. This opens the flow channels of the side inlet 1 and the side outlet 11, allowing the working fluid to flow in from the main inlet 5, enter the expansion interface and its connected expansion load through the side inlet 1, flow back to the four-way valve through the side outlet 11, and then flow out from the main outlet 9. In this state, the liquid working fluid flows through the branch and its connected load, providing heat dissipation support for the load.

[0033] This two-position four-way valve has the following characteristics:

[0034] 1) A flow-limiting boss 2 is provided on the main flow section of the valve core assembly 3 (attached). Figure 3 With the bypass flow resistance unchanged, the effective flow area of ​​the main road is reduced by the flow limiting boss, and the flow resistance of the main road is increased. By setting a boss of appropriate size, the flow resistance is the same in both the main road and bypass valve positions. The flow resistance difference between the main and bypass is less than 1 kPa at a flow rate of 150 L / h, ensuring the stability of the system working pressure and flow rate.

[0035] 2) Bypass valve position, gate structure 1 is designed between main inlet 5 and main outlet 9 (attached) Figure 3 ) Interception is used to prevent cross-flow of the working medium between the side inlet and the side outlet.

[0036] 3) The reverse pressure relief function is achieved through the design of the magnetic force and the structural dimensions of the valve core 3 and valve cover 2. That is, when the main line is in the open valve position, if the bypass pressure is higher than the main line pressure and the pressure difference exceeds a certain threshold (preferably 0.2~0.8MPa), the valve core 3 will momentarily open slightly while keeping the valve position unchanged. This allows the bypass pressure to be relieved to the normal working pressure and then remain sealed to ensure the safety of the bypass pressure. When the bypass inlet or outlet pressure is higher than the main line pressure by 0.4MPa, the valve core sealing pressure ratio is less than 1.05.

[0037] 4) Gate structure 1 of valve core 3 (attached) Figure 3 A polyimide bushing 10 is designed between the valve core 3 and the valve cover 2 to reduce the impact of valve core 3 movement on the gate 1 (attached). Figure 3 Reduce the frictional resistance between the valve cover and valve 2, improve the service life, and ensure that the number of operations is not less than 2000.

[0038] 5) The valve core position can be converted into a voltage signal by the micro switch in the position display device 7 and transmitted to the external control device through the electrical connector 8 for real-time display of valve position status.

[0039] The above technical solutions are merely exemplary embodiments of the present invention. For those skilled in the art, based on the application methods and principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the methods described in the specific embodiments of the present invention. Therefore, the methods described above are merely preferred and not restrictive.

Claims

1. A two-position four-way valve for a space fluid circuit, having two valve position states: main path open and bypass path open, characterized in that, include: The system includes four hydraulic inlets: main inlet, main outlet, bypass inlet, and bypass outlet; a valve cover, valve core assembly, valve body, and a drive mechanism connected to the valve core. In the main passage valve position, the drive mechanism drives the valve core assembly to move downward, so that the sealing ring on the valve core assembly is pressed against the valve cover and locked, closing the side inlet and side outlet flow channels, and the fluid working medium flows in from the main inlet and flows out directly from the main outlet. When the bypass valve is in position, the drive mechanism drives the valve core assembly to move upward, causing the sealing ring on the valve core assembly to separate from the valve cover and lock it in place. This opens the bypass inlet and bypass outlet flow channels, allowing the working fluid to flow in from the main inlet, enter the branch and connected load through the bypass inlet, flow back to the four-way valve through the bypass outlet, and then flow out from the main outlet. The valve core is provided with a flow-limiting boss to ensure that the flow resistance is the same in both the main and bypass valve positions of the four-way valve.

2. The four-way valve as described in claim 1, characterized in that, In the bypass valve position, a gate-type structure is provided between the main inlet and the main outlet to cut off the flow and prevent cross-flow of the working fluid between the bypass inlet and the bypass outlet.

3. The four-way valve as described in claim 2, characterized in that, A non-metallic bushing is provided between the gate-type structure and the valve cover.

4. The four-way valve as described in claim 3, characterized in that, The non-metallic bushing is a polyimide bushing.

5. The four-way valve as described in claim 1, characterized in that, The driving force of the drive mechanism and the structural dimensions of the valve core and valve cover ensure that the four-way valve has a reverse pressure relief function. That is, when the main line is in the valve position, when the bypass pressure is higher than the main line pressure and the pressure difference exceeds a certain threshold, the valve core opens slightly momentarily while keeping the valve position unchanged, so that the bypass pressure is relieved to the normal working pressure and then continues to be sealed.

6. The four-way valve as described in claim 5, characterized in that, The threshold value ranges from 0.2 to 0.8 MPa.

7. The four-way valve as described in claim 6, characterized in that, When the pressure at the bypass inlet or bypass outlet is 0.4 MPa higher than the main pressure, the valve core sealing pressure ratio is less than 1.

05.

8. The four-way valve as described in any one of claims 1-7, characterized in that, The driving mechanism is an electromagnet assembly.

9. The four-way valve as described in claim 8, characterized in that, Also includes: The position display device is used to monitor the valve core position, i.e., the valve position status; An electrical connector is used to supply power to the drive mechanism and to supply power and acquire signals to the position display device.

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