Three-way flow valve capable of limiting pressure

Abstract

The utility model provides a three-way flow valve capable of limiting pressure, which relates to the field of hydraulic valves, and comprises a valve sleeve with a flow channel, a first through hole, a second through hole and a third through hole, the valve element body comprises an upper valve element and a lower valve element arranged below the upper valve element, the valve element is arranged in the flow channel in a sliding mode, the upper valve element is in sliding fit with the flow channel, the lower valve element is in clearance fit with the flow channel, and the upper end of the upper valve element is subjected to downward first acting force; the upper valve element is further provided with a connecting hole, a spring cavity is formed in the valve element, the connecting hole is communicated with the spring cavity and the flow channel, and the lower valve element is further provided with a transverse hole which is formed in the radial direction of the lower valve element and communicated with the spring cavity. The sliding part is arranged in the spring cavity, the bottom of the sliding part is subjected to upward second acting force, the sliding part seals the connecting hole under the action of the second acting force, the valve element body with the overflow function is integrated, a combination of a three-way flow valve and an overflow valve in an oil way system can be replaced, and the risk of leakage of the oil way system is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic valves, in particular to a three-way flow valve capable of limiting pressure. Background Art

[0002] The three-way flow valve is a bypass compensation valve, commonly used in pressure adaptive circuits, that is, load-sensitive systems, and is usually used in parallel with a throttle. Its principle is to adjust its opening to keep the pressure difference before and after the throttle consistent, thereby achieving controllable throttle flow. Figure 1 As shown in the figure, it is a simplified pressure adaptive circuit that realizes a single load through a three-way flow valve; Figure 2 As shown, it is a simplified pressure adaptive circuit that realizes multiple loads through a three-way flow valve. Both of the above circuits achieve the maximum pressure limit of the system by limiting the pressure of the pump outlet or the maximum high pressure of the load;

[0003] Commonly used three-way flow valve structure as shown in the attached Figure 3 As shown, port 1 (01) is connected to the pump outlet, port 2 (02) is connected to the return oil, and port 3 (03) is connected to the feedback pressure. From a structural point of view, the pressure of port 1 (01) acts on the end face of the valve core (04), and the pressure of port 3 (03) and the spring force act together on the other end face of the valve core (04), thereby achieving a balance of forces, so that the pressure difference between port 1 (01) and port 3 (03) is equal to the force of the spring. The spring force is approximately equal to a fixed value. Therefore, this structure also ensures that the pressure difference is approximately equal to a fixed value, thereby achieving load pressure adaptation. The above are the application scenarios and common structures of the commonly existing three-way flow valve.

[0004] In existing applications, a relief valve is required to limit the maximum pressure of the entire oil system in order to prevent the system pressure from exceeding the limit. However, installing an external relief valve on a three-way flow valve not only poses a risk of system leakage but also makes the system structure more decentralized. Utility Model Content

[0005] The utility model provides a three-way flow valve with pressure limiting, which aims to solve the problem that an additional overflow valve needs to be set in the existing hydraulic system to limit the maximum pressure of the system, resulting in the dispersion of the overflow valve and the three-way valve, high cost and high leakage risk.

[0006] In order to achieve the above-mentioned object, an embodiment of the present utility model provides a three-way flow valve capable of limiting pressure, comprising:

[0007] The valve sleeve is provided with a flow channel axially penetrating the valve sleeve, and the valve sleeve is provided with a second through hole and a third through hole in radial direction that are in communication with the flow channel, wherein the third through hole is located above the second through hole;

[0008] The valve core body comprises an upper valve core and a lower valve core provided below the upper valve core, the valve core body being slidably provided in the flow channel, the upper valve core being in sliding engagement with the flow channel, the lower valve core being in clearance engagement with the flow channel, and the upper end of the upper valve core being subjected to a first downward force;

[0009] The upper valve core is further provided with a connecting hole, a spring cavity is provided in the valve core, the connecting hole is connected to the spring cavity and the flow channel, and the lower valve core is further provided with a transverse hole, the transverse hole is provided along the radial direction of the lower valve core and is connected to the spring cavity;

[0010] A sliding member is arranged in the spring cavity, and the bottom of the sliding member is subjected to a second upward force, and the sliding member closes the connecting hole under the action of the second force.

[0011] Preferably, a shell is further provided at the upper end of the valve sleeve, and the shell closes the flow channel above the valve sleeve. A first elastic element is provided in the flow channel, one end of the elastic element abuts against the shell, and the other end abuts against the upper valve core, and the first elastic element is in a compressed state.

[0012] Preferably, a second elastic element is provided in the spring cavity, one end of the second elastic element abuts against the bottom of the spring cavity, and the other end abuts against the sliding member, and the second elastic element is in a compressed state.

[0013] Preferably, the sliding member is conical in shape with the tip of the cone pointing upward.

[0014] Preferably, a bottom hole communicating with the spring chamber is formed at the bottom of the lower valve core, a plug is threaded into the bottom hole, and an upper end of the plug is connected to the second elastic element.

[0015] Preferably, a gasket is further provided between the plug and the second elastic element, and the gasket is detachably provided on the upper end of the plug.

[0016] Preferably, an annular platform is provided in the flow channel, an annular shoulder is provided in the circumference of the upper valve core, and the annular platform is located on the movement path of the annular shoulder.

[0017] Preferably, the upper valve core and the lower valve core are integrally formed.

[0018] The above solution of the utility model has the following beneficial effects:

[0019] First, the present application integrates a valve core body with an overflow function, so that the three-way flow valve has a pressure limiting function, and can replace the combination of the three-way flow valve and the overflow valve in the oil circuit system. The present application has a compact structure and greatly reduces the risk of leakage of the oil circuit system. At the same time, the present application has good integration and is lighter in weight.

[0020] Second, the present application can be used in conjunction with a damping hole to realize the function of a pilot-operated overflow valve, and the oil flow capacity of the present application is very high; the second elastic element has a relatively lower stiffness, so it can adapt to a larger flow range, and the pressure gain is smaller, which can have a better pressure regulation effect.

[0021] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a simplified diagram of a single load pressure adaptive circuit in the prior art;

[0023] Figure 2 It is a simplified diagram of a multi-load pressure adaptive circuit in the prior art;

[0024] Figure 3 It is a structural diagram of an existing three-way flow valve;

[0025] Figure 4 It is a schematic diagram of the structure of this application;

[0026] Figure 5 It is the hydraulic principle symbol of this application.

[0027] Figure 6 This is the application scenario of this application

[0028] [Description of Reference Numerals]

[0029] 01, port 1; 02, port 2; 03, port 3; 04, valve core.

[0030] 10-valve sleeve, 11-flow channel, 12-second through hole, 13-third through hole,

[0031] 20-valve core body, 23-connecting hole, 24-spring chamber, 25-transverse hole, 26-sliding member, 27-second elastic element,

[0032] 30-housing, 31-first elastic element,

[0033] 40-plug,

[0034] 50-Oil inlet. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 4-6As shown, an embodiment of the present invention provides a three-way flow valve with pressure limiting, including a valve sleeve 10 and a valve core body 20, wherein the valve sleeve 10 is provided with a flow channel 11 that axially penetrates the valve sleeve 10, and a second through hole 12 and a third through hole 13 are provided in the radial direction of the valve sleeve 10, the second through hole 12 and the third through hole 13 are respectively connected to the flow channel 11, and the third through hole 13 is located above the second through hole 12.

[0037] The aforementioned valve core body 20 comprises an upper valve core and a lower valve core, with the bottom of the upper valve core connected to the lower valve core. The valve core body 20 is integrally slidably disposed within the flow channel 11, with the upper valve core slidingly engaged with the flow channel 11, and the lower valve core having a clearance fit therewith. As will be understood, the upper valve core can drive the lower valve core to slide within the flow channel 11, while a clearance exists between the lower valve core and the flow channel 11. The upper end of the upper valve core is subjected to a first downward force.

[0038] Furthermore, the valve core body 20 is provided with an axial spring cavity 24, located on both the upper and lower valve cores. A connecting hole 23 is also provided on the upper valve core, connecting the flow channel 11 and the spring cavity 24. A transverse hole 25 is also provided on the outer surface of the lower valve core, radially extending from the lower valve core and communicating with the spring cavity 24. As can be seen from the assembly relationship between the lower valve core and the flow channel 11, a gap exists between the transverse hole 25 and the sidewall of the flow channel 11, allowing liquid within the spring cavity 24 to flow out of the spring cavity 24 through the transverse hole 25.

[0039] A sliding member 26 is further provided in the spring cavity 24. The sliding member 26 can slide in the spring cavity 24 to close the connecting hole 23. Specifically, the bottom of the sliding member 26 is subjected to a second upward force, and the sliding member 26 abuts against the connecting hole 23 under the action of the second force to maintain the connecting hole 23 normally closed.

[0040] In some embodiments of the present application, a housing 30 is further provided at the upper end of the valve sleeve 10, and the housing 30 closes the flow channel 11 at the upper end of the valve sleeve 10. A first elastic element 31 is further provided in the flow channel 11, and one end of the first elastic element 31 abuts against the housing 30, and the other end abuts against the upper valve core, and the first elastic element 31 is in a compressed state.

[0041] The lower end of the flow channel 11 is used for oil inlet (hereinafter referred to as the oil inlet 50). Under the action of oil pressure, the valve core body 20 is pushed upward. When the oil pressure of the oil inlet 50 is equal to the first force of the first elastic element 31, the valve core body 20 stops moving.

[0042] A second elastic element 27 is disposed within the aforementioned spring cavity 24. One end of the second elastic element 27 abuts the bottom of the spring cavity 24, and the other end abuts the sliding member 26. The second elastic element 27 is in a compressed state. Under the action of the second elastic element 27, the sliding member 26 abuts against the connecting hole 23, maintaining the connection hole 23 closed. When oil flows into the third through hole 13, the oil sequentially enters the flow channel 11 and the connecting hole 23. When the oil pressure exceeds the second force of the second elastic element, the sliding member 26 moves downward, and the connecting hole 23 is opened.

[0043] In this application, the shape of the sliding member 26 is not specifically limited. In some embodiments, the sliding member 26 is conical. When the sliding member 26 is disposed in the spring cavity 24, the tip of the cone is positioned upward so that the tip of the cone is inserted into the connecting hole 23, thereby ensuring a sealing effect and facilitating the flow of oil pressure from the flow channel 11 into the spring cavity 24.

[0044] Similar to the prior art, when no oil enters the oil inlet 50, the lower end of the valve core body 20 is located below the second through hole 12. At this time, the oil in the oil inlet 50 cannot flow out of the second through hole 12 in large quantities. When oil enters the oil inlet 50, the valve core body 20 is pushed to move upward. At this time, the oil inlet 50 is connected to the second through hole 12, and the oil can flow out of the second through hole 12 in large quantities, playing a bypass role.

[0045] Unlike the prior art, when oil enters the third through hole 13, the pressure of the oil acts on the sliding member 26, pushing the sliding member 26 downward, opening the connecting hole 23, and the oil enters the spring cavity 24 and flows out of the spring cavity 24 through the transverse hole 25, thereby limiting the maximum pressure of the third through hole 13. The oil inlet pressure of the oil inlet 50 is equal to the sum of the oil inlet pressure of the third through hole 13 and the second force of the second elastic element 27. Therefore, in this application, limiting the sum of the oil inlet pressure of the third through hole 13 and the second force is equivalent to limiting the maximum pressure of the oil inlet 50, which is the same as the pressure limiting method of method 2 in the background art, but the original overflow valve is omitted from the structure, ensuring that the structure of this application is more compact.

[0046] Furthermore, the maximum pressure at the oil inlet 50 can be adjusted by varying the second force of the second elastic element 27. Specifically, a bottom hole is formed at the bottom of the lower valve core, which communicates with the spring chamber 24. A plug 40 is detachably disposed within the bottom hole, the upper end of which is connected to the second elastic element 27.

[0047] In this embodiment, the plug 40 is threadedly engaged with the bottom hole. By changing the length of the plug 40 extending into the spring cavity 24, the compression distance of the second elastic element 27 is adjusted, thereby adjusting the second acting force.

[0048] Preferably, a gasket may be provided between the plug 40 and the second elastic element 27 , and the compression distance of the second elastic element 27 may be adjusted by providing different numbers of gaskets.

[0049] Preferably, the first elastic element 31 and the second elastic element 27 are both springs.

[0050] Furthermore, to maintain the stability of the valve core body 20 when no oil is flowing into the oil inlet 50, a shoulder is provided around the circumference of the upper valve core, and a land is provided within the flow channel 11, located in the movement path of the shoulder. When there is no oil pressure at the oil inlet 50, the shoulder abuts against the land under the action of the first elastic element 31, preventing the valve core body 20 from dislodging from the oil inlet 50 along the flow channel 11.

[0051] Preferably, the upper valve core and the lower valve core are integrally formed.

[0052] In this application, the overflow valve and the three-way flow valve are integrated together. On the one hand, the structure is more compact and the weight is lighter. On the other hand, the two parts are combined together, which has more advantages in cost and structural compactness than the traditional overflow valve combination, and reduces the risk of leakage.

[0053] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A three-way flow valve with pressure limiting function, characterized in that: include: A valve sleeve (10) is provided with a flow channel (11) axially penetrating the valve sleeve (10), and the valve sleeve (10) is provided with a second through hole (12) and a third through hole (13) in radial direction, the second through hole (12) and the third through hole (13) being in communication with the flow channel (11), wherein the third through hole (13) is located above the second through hole (12); A valve core body (20) comprises an upper valve core and a lower valve core arranged below the upper valve core, wherein the valve core body (20) is slidably arranged in the flow channel (11), the upper valve core is slidably fitted with the flow channel (11), the lower valve core is clearance-fitted with the flow channel (11), and the upper end of the upper valve core is subjected to a first downward force; The upper valve core is further provided with a connecting hole (23), a spring cavity (24) is provided in the valve core, the connecting hole (23) is connected to the spring cavity (24) and the flow channel (11), and the lower valve core is further provided with a transverse hole (25), the transverse hole (25) is provided along the radial direction of the lower valve core and is connected to the spring cavity (24); A sliding member (26) is arranged in the spring cavity (24), and the bottom of the sliding member (26) is subjected to a second upward force. The sliding member (26) closes the connecting hole (23) under the action of the second force.

2. The pressure-limited three-way flow valve according to claim 1, characterized in that: The upper end of the valve sleeve (10) is further provided with a shell (30), and the shell (30) closes the flow channel (11) above the valve sleeve (10). A first elastic element (31) is provided in the flow channel (11), and one end of the elastic element abuts against the shell (30), and the other end abuts against the upper valve core. The first elastic element (31) is in a compressed state.

3. The three-way flow valve with pressure limit according to claim 1, characterized in that: A second elastic element (27) is provided in the spring cavity (24), one end of the second elastic element (27) abuts against the bottom of the spring cavity (24), and the other end abuts against the sliding member (26), and the second elastic element (27) is in a compressed state.

4. The pressure-limited three-way flow valve according to claim 3, characterized in that: The sliding member (26) is conical in shape with the tip of the cone pointing upward.

5. The three-way flow valve with pressure limit according to claim 3, characterized in that: A bottom hole communicating with the spring chamber (24) is provided at the bottom of the lower valve core, a plug (40) is screwed into the bottom hole, and the upper end of the plug (40) is connected to the second elastic element (27).

6. The three-way flow valve with pressure limit according to claim 5, characterized in that: A gasket is further provided between the plug (40) and the second elastic element (27), and the gasket is detachably provided on the upper end of the plug (40).

7. The three-way flow valve with pressure limit according to claim 1, characterized in that: An annular platform is provided in the flow channel (11), an annular shoulder is provided in the circumference of the upper valve core, and the annular platform is located on the movement path of the annular shoulder.

8. The three-way flow valve with pressure limit according to claim 1, characterized in that: The upper valve core and the lower valve core are integrally formed.

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