Straight-through high pressure relief valve with pressure impact resistance

Abstract

The application discloses a straight-through high-pressure overflow valve with pressure impact resistance. The application solves the problems of complicated structure, great impact and small overflow flow of the existing high-pressure overflow valve. The valve seat is provided with a first oil port and a second oil port. The oil supplementing one-way valve has a first position which is opened to facilitate the communication between the first oil port and the second oil port when oil enters the first oil port, and a second position which is closed. The overflow valve core has a first position which is opened to make the second oil port communicate with the first oil port when oil enters the second oil port, and a second position which is closed. The overflow valve core and the oil supplementing one-way valve can separate the first oil port and the second oil port. The oil supplementing one-way valve can realize the oil supplementing from the first oil port to the second oil port. The overflow valve core can make the pressure oil of the second oil port rapidly leak. The application has the advantages of simple structure, reduced part quantity, great overflow flow, small pressure impact, sensitive reaction and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of overflow valves, specifically relates to a kind of straight-through high pressure overflow valve with pressure impact resistance. BACKGROUND

[0002] With the development of agricultural machinery and engineering machinery, customer's pressure level requirement of various agricultural machinery and engineering machinery vehicles used plunger pump is constantly improved.Especially agricultural machinery vehicles, its working process pressure impact frequency is high, the reliability requirement of plunger pump is very high.At present, the plunger pump used in agricultural machinery vehicles is basically equipped with high pressure overflow valve, which can better protect the damage to the system caused by pressure impact.High pressure overflow valve plays a safety protection role in the system, when the system pressure exceeds the specified value, the safety valve is opened, part of the gas in the system is discharged into the atmosphere, so that the system pressure does not exceed the allowable value, so as to ensure that the system does not occur due to high pressure.The commonly configured high pressure overflow valve has two kinds, one is straight-through high pressure overflow valve, its structure is simple, the cost is low, such as existing high pressure overflow valve (see attached Figure 1 ), it is usually pull rod type valve core, from P oil inlet, push valve rod, overflow valve core movement, overflow valve core opens, hydraulic oil flows out from overflow valve port, due to the valve rod passing through the overflow valve port, so that the system overflow flow is small, and the pressure impact resistance of product is low, after P port pressure disappears, overflow valve core is quickly returned under the action of elastic element and hits valve seat (spring seat), overflow valve core often fails due to too high pressure impact. SUMMARY

[0003] To solve the problem of complex structure, impact and small overflow of existing high pressure overflow valve in the background art, the present application provides a kind of straight-through high pressure overflow valve with pressure impact resistance.

[0004] The technical scheme of the present application is: a kind of straight-through high pressure overflow valve with pressure impact resistance, including valve seat, oil supplementing check valve and overflow valve core, the first oil port and the second oil port are provided on the valve seat, the oil supplementing check valve has the first position that is opened when the first oil port is filled with oil to facilitate the communication between the first oil port and the second oil port and the second position that is closed, the overflow valve core has the first position that is opened to make the second oil port communicate with the first oil port when the second oil port is filled with oil and the second position that is closed.

[0005] As a further improvement of the present application, the oil supplementing check valve is arranged in the valve seat and separates the space in the valve seat into a first cavity and a second cavity, the first cavity is communicated with the first oil port, the second cavity is communicated with the second oil port, a first elastic member is arranged in the first cavity, the first elastic member abuts against the overflow valve spool and has a second position to drive the overflow valve spool to close, the second oil port is communicated with the first cavity by overcoming the elastic force of the overflow valve spool when oil is fed.

[0006] As a further improvement of the present application, the overflow valve spool is suspended in the first cavity, the first elastic member is sleeved outside the overflow valve spool and drives the overflow valve spool to its second position.

[0007] As a further improvement of the present application, a valve sleeve is arranged on the valve seat, a communication channel communicated with the second cavity is arranged on the valve sleeve, the overflow valve spool is matched with the valve sleeve to separate the communication channel and the first cavity when the overflow valve spool is in the second position.

[0008] As a further improvement of the present application, a groove is arranged on the valve sleeve at the end of the communication channel close to the overflow valve spool, the overflow valve spool is inserted into the communication channel and sealed with the inclined surface of the valve sleeve.

[0009] As a further improvement of the present application, the valve sleeve is screwed with the valve seat, the oil supplementing check valve is arranged outside the valve sleeve and is slidingly matched with the valve sleeve when oil is fed in the first oil port.

[0010] As a further improvement of the present application, a second elastic member is arranged in the second cavity, the second elastic member abuts against the oil supplementing check valve and has a second position to drive the oil supplementing check valve to close, the elastic force of the first elastic member is greater than that of the second elastic member.

[0011] As a further improvement of the present application, an adjusting gasket is arranged in the first cavity, the adjusting gasket is detachably connected in the valve seat.

[0012] As a further improvement of the present application, the first oil port and the second oil port are both arranged in a normal-through mode.

[0013] The present application has the advantages that the overflow valve spool and the oil supplementing check valve can separate the first oil port and the second oil port, the oil supplementing check valve can supplement oil from the first oil port to the second oil port, the overflow valve spool can quickly drain the pressure oil in the second oil port, the present application has the advantages of simplified structure, reduced number of parts, reduced weight and cost, and also has the advantages of large overflow flow, small pressure impact and sensitive reaction. BRIEF DESCRIPTION OF DRAWINGS

[0014] ATTACHMENT Figure 1 It is a structural schematic view of the prior art high-pressure overflow valve.

[0015] Figure 1 is a structural schematic diagram of an embodiment of the present application. Figure 2 Figure 2 is a structural schematic diagram of an embodiment of the present application.

[0016] Figure 3 is a structural schematic diagram of an embodiment of the present application. Figure 3 Figure 4 is a structural schematic diagram of an embodiment of the present application when the overflow valve core is opened.

[0017] Figure 5 is a structural schematic diagram of an embodiment of the present application when the oil supplement one-way valve is opened. Figure 4 Figure 6 is a structural schematic diagram of an embodiment of the present application.

[0018] In the figure, 1, valve seat; 11, first cavity; 12, second cavity; 13, first elastic member; 14, second elastic member; 2, oil supplement one-way valve; 3, overflow valve core; 4, first oil port; 5, second oil port; 6, valve sleeve; 61, communication passage; 62, groove; 7, adjusting gasket. DETAILED DESCRIPTION

[0019] The embodiments of the present application are further described below in conjunction with the accompanying drawings:

[0020] From the above description of the present application, it can be seen that the present application has the advantages of simple structure, low cost, and the like. Figure 2 In combination with the above description of the present application, it can be seen that the present application has the advantages of simple structure, low cost, and the like. Figures 3-4The application discloses a straight-through high-pressure overflow valve with pressure impact resistance, which comprises a valve seat 1, an oil supplementing check valve 2 and an overflow valve core 3. The valve seat 1 is provided with a first oil port 4 and a second oil port 5. The oil supplementing check valve 2 has a first position which is opened to facilitate the communication between the first oil port 4 and the second oil port 5 when oil enters the first oil port 4, and a second position which is closed. The overflow valve core 3 has a first position which is opened to enable the second oil port 5 to communicate with the first oil port 4 when oil enters the second oil port 5, and a second position which is closed. The application has the advantages of simple structure, reduced number of parts, light weight, reduced cost, large overflow flow, small pressure impact, sensitive reaction and the like. Specifically, in the system, when the pressure of the second oil port is increased to be higher than the set pressure of the overflow valve core (when the system is under high pressure), the pressure oil in the communication channel opens the overflow valve core, the pressure oil quickly enters the first cavity and is discharged from the first oil port, the first cavity and the first oil port are always communicated, the communication channel is not blocked after the overflow valve core is opened, the communication channel can be completely used for discharging oil, the overflow flow is large, and the safety of the product is higher. Of course, in some special occasions or closed systems, the first oil port is used for oil supplementing (low-pressure oil), the oil supplementing check valve is moved to enable the first oil port to communicate with the second oil port through the first cavity, and the oil supplementing check valve is used for oil supplementing. The overflow valve has the function of the oil supplementing check valve, and the balance between the force area of the oil supplementing check valve and the stiffness coefficient of the spring force is improved, so that the pressure difference between the circuit pressure of the closed pump and the outlet pressure of the oil supplementing pump is reduced, and the oil supplementing pump is more sensitive to the oil supplementing of the pump.

[0021] The oil supplementing check valve 2 is arranged in the valve seat 1 and divides the space in the valve seat 1 into a first cavity 11 and a second cavity 12. The first cavity 11 communicates with the first oil port 4, the second cavity 12 communicates with the second oil port 5, the first cavity 11 is provided with a first elastic member 13, the first elastic member 13 abuts against the overflow valve core 3 and drives the overflow valve core 3 to tend to the second position, and the second oil port 5 communicates with the first cavity 11 by overcoming the elastic force of the overflow valve core 3 when oil enters. Specifically, the overflow valve core 3 is suspended in the first cavity 11, and the first elastic member 13 is arranged outside the overflow valve core 3 and drives the overflow valve core 3 to tend to the second position. The application cancels the pull rod type overflow valve core and changes it into a push type, so that the overflow valve core and the pull rod are not easy to break in actual use, the overflow flow is increased, and the pressure impact can be effectively controlled.

[0022] The valve seat 1 is provided with a valve sleeve 6, the valve sleeve 6 is provided with a communication channel 61 connected with the second cavity 12, the overflow valve core 3 is matched with the valve sleeve 6 to separate the communication channel 61 and the first cavity 11 when the overflow valve core 3 is in the second position. Specifically, the valve sleeve 6 is provided with a groove 62 at the end of the communication channel 61 close to the overflow valve core 3, the overflow valve core 3 is inserted into the communication channel 61 and is sealed with the inclined surface of the valve sleeve 6. Such structure makes the product sealing more reliable, realizes the taper sealing, and the structure is simple. When opened, the overflow valve core completely leaves the communication channel, and the pressure oil can quickly enter the first cavity and be discharged from the first oil port, the structure is simple, the overflow flow is large, and the impact is small.

[0023] The valve sleeve 6 is threadedly connected with the valve seat 1, the oil supplementing one-way valve 2 is sleeved outside the valve sleeve 6 and is in sliding fit with the valve sleeve 6 when the oil enters the first oil port 4. Such structure facilitates the reliable connection of the valve sleeve, the structure is simple, the installation is convenient and reliable, the product is convenient to maintain and replace, and the first elastic member and the adjusting gasket are convenient to adjust or replace.

[0024] The second cavity 12 is provided with a second elastic member 14, the second elastic member 14 is abutted with the oil supplementing one-way valve 2 and has a second position driving the oil supplementing one-way valve 2 to be closed, and the elastic force of the first elastic member 13 is greater than that of the second elastic member 14. Such structure makes the oil supplementing one-way valve in the closed state, and makes the system run reliably.

[0025] The first cavity 11 is provided with an adjusting gasket 7, and the adjusting gasket 7 is detachably connected in the valve seat 1. The adjusting gasket can be adjusted or replaced according to the system requirement, so that the elastic force of the first elastic member is adjusted, that is, the set overflow pressure of the system is adjusted, and the adjustment is convenient and reliable.

[0026] The first oil port 4 and the second oil port 5 are both commonly connected. The first oil port and the first cavity are commonly connected, and the second oil port and the second cavity are commonly connected, so that the product responds quickly and is more sensitive.

[0027] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0029] Skilled in the art should know: although the present application has been described in the above specific embodiments, the inventive idea of the present application is not limited to this invention, any modification using the inventive idea will be included in the scope of protection of the present patent.

Claims

1. A direct-operated high pressure poppet relief valve with resistance to pressure shocks, characterized in that The application relates to a valve seat (1), an oil supplementing one-way valve (2) and an overflow valve core (3), wherein the valve seat (1) is provided with a first oil port (4) and a second oil port (5); the oil supplementing one-way valve (2) has a first position for opening to facilitate the communication between the first oil port (4) and the second oil port (5) when oil flows into the first oil port (4) and a second position for closing; the overflow valve core (3) has a first position for opening to make the second oil port (5) communicate with the first oil port (4) when oil flows into the second oil port (5) and a second position for closing; the oil supplementing one-way valve (2) is arranged in the valve seat (1) and divides the space in the valve seat (1) into a first cavity (11) and a second cavity (12); the first cavity (11) communicates with the first oil port (4); the second cavity (12) communicates with the second oil port (5); a first elastic member (13) is arranged in the first cavity (11) and abuts against the overflow valve core (3) and drives the overflow valve core (3) to tend to the second position; when oil flows into the second oil port (5), the second cavity (12) communicates with the first cavity (11) by overcoming the elastic force of the overflow valve core (3); the overflow valve core (3) is suspended in the first cavity (11); the first elastic member (13) is arranged outside the overflow valve core (3) and drives the overflow valve core (3) to tend to the second position; the valve seat (1) is provided with a valve sleeve (6); the valve sleeve (6) is provided with a communication channel (61) communicating with the second cavity (12); when the overflow valve core (3) is in the second position, the overflow valve core (3) cooperates with the valve sleeve (6) to divide the communication channel (61) and the first cavity (11).

2. A direct-operated high pressure poppet relief valve with pressure force cushion according to claim 1, characterized in that The valve sleeve (6) is provided with a groove (62) at the end of the communication channel (61) close to the overflow valve core (3); the overflow valve core (3) is inserted into the communication channel (61) and seals the valve sleeve (6) by means of an inclined surface.

3. A direct-operated high pressure pistonless spool valve with pressure force shock resistance according to claim 1, characterized in that The valve sleeve (6) is threadedly connected with the valve seat (1); the oil supplementing one-way valve (2) is arranged outside the valve sleeve (6) and is in sliding cooperation with the valve sleeve (6) when oil flows into the first oil port (4).

4. A direct-operated high pressure pistonless spool valve with pressure force shock resistance according to claim 1, characterized in that The second cavity (12) is provided with a second elastic member (14); the second elastic member (14) abuts against the oil supplementing one-way valve (2) and drives the oil supplementing one-way valve (2) to tend to the second position; the elastic force of the first elastic member (13) is greater than that of the second elastic member (14).

5. A direct-operated high pressure pistonless spool valve with pressure force shock resistance according to claim 1, characterized in that The first cavity (11) is provided with an adjusting gasket (7); the adjusting gasket (7) is detachably connected in the valve seat (1).

6. A direct-operated high pressure pistonless spool valve with pressure force shock resistance according to claim 1, characterized in that The first oil port (4) and the second oil port (5) are both in a constant communication mode.

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