Overflow valve assembly

Abstract

The utility model discloses an overflow valve assembly, and relates to the technical field of hydraulic control, the overflow valve assembly comprises a valve body, the end face of the valve body is provided with a temperature medium liquid inlet, a temperature medium liquid outlet and a communicating cavity communicating the temperature medium liquid inlet with the temperature medium liquid outlet; the piston piece is mounted in the communicating cavity in a sliding manner, and the piston piece abuts against and seals the temperature medium liquid inlet; the end face of the valve body is further provided with a hydraulic control liquid inlet, the hydraulic control liquid inlet is communicated with a communication cavity chamber on the side, away from the temperature medium liquid inlet, of the piston piece, and the temperature medium liquid inlet and the temperature medium liquid outlet are not communicated with the hydraulic control liquid inlet. The hydraulic system has the effect of controlling the overflow pressure of the temperature medium, meanwhile, large-area heat exchange between the temperature medium and the hydraulic oil is avoided, and the temperature of the hydraulic oil is prevented from being greatly influenced.

Description

Technical Field

[0001] The present application relates to the field of hydraulic control technology, and in particular to a relief valve assembly. Background Art

[0002] Due to the special application scenarios, aviation parts have high requirements for the parts' resistance to high temperature, low temperature and high pressure. In the production of aviation parts, the parts need to be placed in ultra-high temperature, ultra-low temperature and high pressure environments for testing to detect the various characteristics and service life of the parts.

[0003] According to customer needs, the applicant needs to design a hydraulic system to control ultra-high temperature / ultra-low temperature high pressure test system, but the medium temperature of the hydraulic system cannot be too high, which will easily affect the temperature of the system. Therefore, the hydraulic system can only meet the pressure requirements required for the test and cannot directly supply ultra-high temperature / ultra-low temperature medium.

[0004] With respect to the above-mentioned related technologies, in order to. Utility Model Content

[0005] On the one hand, the present application provides a relief valve assembly, which adopts the following technical solution:

[0006] A relief valve assembly comprises a valve body, wherein the end surface of the valve body is provided with a temperature medium inlet, a temperature medium outlet and a connecting cavity connecting the temperature medium inlet and the temperature medium outlet; further comprising a piston member slidably mounted in the connecting cavity, the piston member abutting and closing the temperature medium inlet; a hydraulic control inlet is also arranged on the end surface of the valve body, the hydraulic control inlet is connected to the connecting cavity chamber of the piston member away from the temperature medium inlet, and the temperature medium inlet and the temperature medium outlet are not connected to the hydraulic control inlet.

[0007] By adopting the above technical solution, the pipeline of the hydraulic control system is connected to the hydraulic control inlet, and the connection between the temperature medium inlet and the temperature medium outlet needs to overcome the pressure of the hydraulic control on the other side of the piston. In this way, the output pressure of the temperature medium can be controlled by using the pressure of the hydraulic oil without contacting the temperature medium and the hydraulic oil.

[0008] Optionally, the connecting cavity includes a temperature medium chamber and a pressure control chamber, and the piston member includes a first piston body that closes a temperature medium inlet and a second piston body that cooperates with a sliding seal of the pressure control chamber, and the first piston body is fixed to the second piston body.

[0009] By adopting the above technical solution, a temperature medium chamber and a pressure control chamber are provided to respectively introduce the temperature medium and the hydraulic oil, so as to better separate the temperature medium and the hydraulic oil and avoid a significant impact on the hydraulic oil temperature.

[0010] Optionally, an elastic member is provided between the end of the second piston body and the inner wall of the pressure control chamber, and the elastic member abuts against the second piston body to make the first piston body tightly abut against and seal the temperature medium inlet.

[0011] By adopting the above technical solution, an elastic member is arranged to abut against the second piston body, and the elastic member is used to maintain the normally closed state of the temperature medium inlet.

[0012] Optionally, one end of the first piston body close to the temperature medium inlet is configured to be conical; a sealing ring that seals with the first plug is installed on the inner side of the temperature medium inlet.

[0013] By adopting the above technical solution, the end of the first piston body is set to be conical, and the conical surface is used to cooperate with the conical surface on the sealing ring for sealing, so the sealing performance is more reliable.

[0014] Optionally, the valve body includes a main body and a sealing cover, the communicating cavity is opened from the end surface of the main body, the temperature medium inlet is opened on the sealing cover and passes through the sealing cover, and the sealing ring is fixed on a side of the sealing cover close to the main body.

[0015] By adopting the above technical solution, the valve body is reduced to two parts, the main body and the cover, which facilitates the processing of the pipeline and chamber structure in the valve body, and facilitates the assembly of the piston, sealing ring and other parts in the valve body.

[0016] Optionally, the cross-sectional area of ​​the temperature medium chamber is larger than the cross-sectional area of ​​the pressure control chamber.

[0017] By adopting the above technical solution, the temperature medium chamber is used to connect the temperature medium inlet and the temperature medium outlet, and requires a larger space to ensure the smooth flow of the temperature medium; the pressure control chamber is only used for pressure control, and the cross-sectional area of ​​the pressure control chamber is set smaller, which can reduce the heat exchange area between the hydraulic oil and the temperature medium, reduce the interference of temperature on the hydraulic oil temperature, and better ensure the normal operation of the hydraulic control system.

[0018] Optionally, the temperature medium chamber and the hydraulic control chamber are both cylindrical chambers; the first piston body and the second piston body are both columnar pistons, and the maximum diameter of the first piston body is less than or equal to the maximum diameter of the second piston body.

[0019] By adopting the above technical solution, the piston member as a whole moves through the pressure difference between the first piston body end face and the second piston body end face, and the ratio of the first piston body end face to the second piston body end face will affect the hydraulic pressure demand of the hydraulic control system. The maximum diameter of the first piston body is designed to be less than or equal to the maximum diameter of the second piston body, and the force-bearing area of ​​the first piston body is not less than the force-bearing area of ​​the second piston body, which can avoid the control pressure needing to be greater than the pressure required by the temperature medium and avoid increasing the pressure demand of the hydraulic system.

[0020] Optionally, a proportional pressure reducing valve component is also included, and the proportional pressure reducing valve component is installed on the valve body to control the pressure of the hydraulic control inlet.

[0021] By adopting the above technical solution, the proportional pressure reducing valve component is used to control the pressure of the hydraulic oil, thereby better adjusting the pressure of the temperature control medium.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The present application discloses a relief valve assembly, which uses a piston to separate a temperature medium and hydraulic oil, and then uses the pressure difference on both sides of the piston to control the movement of the piston. The piston avoids direct contact between the temperature medium and the hydraulic oil, prevents the hydraulic oil in the hydraulic system from being affected by ultra-high and ultra-low temperatures, and ensures the normal operation of the hydraulic system.

[0024] 2. By setting the connecting chamber to be composed of a temperature medium chamber and a pressure control chamber, and setting the cross-sectional area of ​​the temperature medium chamber to be larger than that of the pressure control chamber, the temperature medium chamber is used to connect the temperature medium inlet and the temperature medium outlet, and requires a larger space to ensure the smooth flow of the temperature medium; the pressure control chamber is only used for pressure control, and setting the cross-sectional area of ​​the pressure control chamber to be smaller can reduce the heat exchange area between the hydraulic oil and the temperature medium, reduce the interference of temperature on the hydraulic oil temperature, and better ensure the normal operation of the hydraulic control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0026] Figure 2 yes Figure 1 AA section view (only the valve body is cut);

[0027] Figure 3 yes Figure 2 BB cross-sectional view;

[0028] Figure 4 yes Figure 1 C-direction perspective view (showing the location of some internal pipes).

[0029] Description of the drawings: 1. Valve body; 2. Sealing cover; 21. Temperature medium inlet; 22. Sealing ring; 3. Main body; 31. Connecting chamber; 311. Temperature medium chamber; 312. Hydraulic control chamber; 32. Temperature medium outlet; 33. Hydraulic control inlet; 34. First pressure reducing valve interface; 35. Second pressure reducing valve interface; 4. Piston member; 41. First piston body; 42. Second piston body; 5. Elastic member; 6. Sealing ring; 7. Proportional pressure reducing valve component. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The present application discloses a relief valve assembly, referring to Figure 1 , including a valve body 1 and a proportional pressure reducing valve component 7, wherein the valve body 1 is a stainless steel valve block.

[0032] refer to Figure 2 and Figure 3 The valve body 1 includes a main body 3 and a cover 2. The cover 2 is fixed to the main body 3 with bolts. A sealing ring 22 is installed between the cover 2 and the main body 3 to improve the sealing performance. A cylindrical connecting cavity 31 is opened from the end face of the main body 3 near the cover 2. The connecting cavity 31 includes a temperature medium chamber 311 and a hydraulic control chamber 312 coaxially opened from the end face in sequence. The diameter of the temperature cut-off chamber is larger than the diameter of the hydraulic control chamber 312 (that is, the cross-sectional area of ​​the temperature medium chamber 311 is larger than the cross-sectional area of ​​the pressure control chamber); a temperature medium outlet 32 ​​connected to the temperature medium chamber 311 is opened on one side of the main body 3, and the axis of the temperature medium outlet 32 ​​is perpendicular to the axis of the temperature medium chamber 311; a hydraulic control inlet 33 connected to the hydraulic control chamber 312 is opened on the end face of the main body 3 where the proportional pressure reducing valve component 7 is installed, and the hydraulic control inlet 33 is connected to the proportional pressure reducing valve.

[0033] A temperature medium inlet 21 is coaxially formed on the cover 2 and corresponding to the temperature medium chamber 311 . A sealing ring 6 is embedded and fixed on one side of the temperature medium inlet 21 close to the main body 3 .

[0034] It also includes a piston member 4 slidably mounted in the connecting chamber 31, the piston member 4 includes a first piston body 41 that seals the temperature medium inlet 21 and a second piston body 42 that slides and seals with the pressure control chamber, the first piston body 41 and the second piston body 42 are coaxially arranged in one piece; an elastic member 5 is arranged between the end of the second piston body 42 and the inner wall of the pressure control chamber, the elastic member 5 is a spring, and the elastic member 5 abuts the second piston body 42 to make the first piston body 41 abut against the sealed temperature medium inlet 21. The end of the first piston body 41 close to the temperature medium inlet 21 is set to a cone shape, and a sealing ring 6 that seals with the end of the first piston body 41 is installed on the inner side of the temperature medium inlet 21. The first piston body 41 and the second piston body 42 are both columnar pistons, and the maximum diameter of the first piston body 41 is less than or equal to the maximum diameter of the second piston body 42. In this embodiment, the diameter of the cone bottom surface on the first piston body 41 is equal to the diameter of the second piston body 42.

[0035] In order to reliably separate the temperature medium chamber 311 from the hydraulic control chamber 312 , a plurality of sealing rings 6 are provided on the second piston body 42 along the circumferential direction.

[0036] refer to Figure 4 There are other interfaces on the side of the proportional pressure reducing valve component 7 corresponding to the hydraulic control liquid inlet 33. In order to facilitate the connection of pipelines, the other pipelines on the proportional pressure reducing valve component 7 in the main body 3 are respectively provided with a first proportional valve interface and a second proportional valve interface.

[0037] The implementation principle of a relief valve assembly disclosed in the embodiment of the present application is: the temperature medium and the hydraulic oil are separated by a piston member 4, and the movement of the piston member 4 is controlled by the pressure difference on both sides of the piston member 4. The piston member 4 avoids direct contact between the temperature medium and the hydraulic oil, prevents the hydraulic oil in the hydraulic system from being affected by ultra-high temperature and ultra-low temperature, and ensures the normal operation of the hydraulic system. By setting the connecting chamber 31 as two parts, the temperature medium chamber 311 and the pressure control chamber, and setting the cross-sectional area of ​​the temperature medium chamber 311 to be larger than the cross-sectional area of ​​the pressure control chamber, the temperature medium chamber 311 is used to connect the temperature medium inlet 21 and the temperature medium outlet 32, and requires a larger space to ensure the smooth flow of the temperature medium; the pressure control chamber is only used for pressure control, and the cross-sectional area of ​​the pressure control chamber is set to be smaller, which can reduce the heat exchange area between the hydraulic oil and the temperature medium, reduce the interference of temperature on the temperature of the hydraulic oil, and better ensure the normal operation of the hydraulic control system.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A relief valve assembly, characterized in that: The invention comprises a valve body (1), wherein the end surface of the valve body (1) is provided with a temperature medium inlet (21), a temperature medium outlet (32) and a connecting cavity (31) connecting the temperature medium inlet (21) and the temperature medium outlet (32); and further comprises a piston member (4) slidably mounted in the connecting cavity (31), wherein the piston member (4) abuts against and seals the temperature medium inlet (21); and a hydraulic control inlet (33) is also provided on the end surface of the valve body (1), wherein the hydraulic control inlet (33) is connected to a chamber of the connecting cavity (31) on a side of the piston member (4) away from the temperature medium inlet (21), wherein the temperature medium inlet (21) and the temperature medium outlet (32) are not connected to the hydraulic control inlet (33).

2. A relief valve assembly according to claim 1, characterized in that: The connecting cavity (31) comprises a temperature medium chamber (311) and a pressure control chamber, and the piston member (4) comprises a first piston body (41) sealing a temperature medium inlet (21) and a second piston body (42) slidingly sealed with the pressure control chamber, wherein the first piston body (41) is fixed to the second piston body (42).

3. A relief valve assembly according to claim 2, characterized in that: An elastic member (5) is provided between the end of the second piston body (42) and the inner wall of the pressure control chamber, and the elastic member (5) abuts against the second piston body (42) so that the first piston body (41) tightly abuts against and seals the temperature medium inlet (21).

4. A relief valve assembly according to claim 2, characterized in that: One end of the first piston body (41) close to the temperature medium inlet (21) is arranged in a conical shape; a sealing ring (6) which is in sealing cooperation with the first plug is installed on the inner side of the temperature medium inlet (21).

5. A relief valve assembly according to claim 4, characterized in that: The valve body (1) comprises a main body (3) and a sealing cover (2); the communicating cavity (31) is opened from the end surface of the main body (3); the temperature medium inlet (21) is opened on the sealing cover (2) and passes through the sealing cover (2); and the sealing ring (6) is fixed on a side of the sealing cover (2) close to the main body (3).

6. A relief valve assembly according to claim 2, characterized in that: The cross-sectional area of ​​the temperature medium chamber (311) is greater than the cross-sectional area of ​​the pressure control chamber.

7. A relief valve assembly according to claim 6, characterized in that: The temperature medium chamber (311) and the hydraulic control chamber (312) are both cylindrical chambers; the first piston body (41) and the second piston body (42) are both columnar pistons, and the maximum diameter of the first piston body (41) is less than or equal to the maximum diameter of the second piston body (42).

8. The overflow valve assembly according to claim 1, characterized in that: It also includes a proportional pressure reducing valve component (7), which is installed on the valve body (1) to control the pressure of the hydraulic control inlet (33).

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