Oil drain valve with throttling structure

Abstract

The utility model discloses an oil drain valve with a throttling structure. The oil drain valve is characterized by comprising an oil drain valve body, a small valve seat, an oil drain hole, a valve needle and a throttling groove, wherein the oil drain valve body is movably connected in a lower cavity; the small valve seat is movably connected in the oil drain valve body; and a steel ball for blocking the oil drainage hole is arranged between the small valve seat and the oil drainage hole. Due to the fact that the throttling groove is formed in the valve needle, when a certain load or rated load exists and the oil return valve rod cannot push the oil drain valve body to move downwards to return oil, the valve needle is pushed to move downwards, the valve needle pushes away the steel ball sealing the oil drain hole in the downward moving process, then oil drainage and pressure relief are conducted through the throttling groove, and slow descending is formed. And oil is quickly discharged until the oil return valve rod can push the oil discharge valve body.

Description

Technical Field

[0001] The utility model relates to an oil drain valve, in particular to an oil drain valve with a throttling structure. Background Art

[0002] Oil drain valves are widely used in various power machinery products. Existing oil drain valves include manual and automatic methods. The manual method is to open or close the oil drain valve by rotating the oil drain valve stem to adjust its position. The automatic method is to open or close the oil drain valve by a driving device pushing the oil drain valve stem to move it. The manual method is cumbersome and inconvenient to use, while the automatic method is convenient and quick to operate. However, the force required to push the oil drain valve stem to open the oil drain valve varies depending on the load. When the oil is under no load, the required force is small. When the oil is under a certain load or rated load, if the force pushing the oil drain valve stem is the same as the force under light load, it is difficult to push the oil drain valve stem to move. If the force pushing the oil drain valve stem is less than the load, the oil drain valve cannot be opened to unload the oil. A greater force is required to open the oil drain valve. However, the force of the driving mechanism pushing the oil drain valve stem has a certain limit. Once the limit is exceeded, the oil drain valve cannot be opened to unload the oil. At the same time, in order to slow down the oil discharge process, a oil drain valve with a throttling structure is proposed. Utility Model Content

[0003] The purpose of the utility model is to solve the above problems and to provide an oil drain valve with a throttling structure.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: an oil drain valve with a throttling structure, comprising a valve block and an oil drain valve installed on the valve block; the characteristic is that the valve block is provided with an oil drain valve cavity for installing the oil drain valve, the oil drain valve cavity is provided with an oil drain valve seat, the oil drain valve cavity forms an upper cavity and a lower cavity through the oil drain valve seat, the oil drain valve comprises an oil drain valve body movably connected in the lower cavity, a small valve seat movably connected in the oil drain valve body, an oil drain hole provided on the oil drain valve body, a valve needle movably installed in the oil drain hole, and a throttling groove provided on the valve needle for throttling; a steel ball for sealing the oil drain hole is installed between the small valve seat and the oil drain hole.

[0005] Further preferably, the throttling groove is arranged on the side wall of the valve needle.

[0006] Further preferably, it also includes a return spring arranged in the lower cavity for pushing the small valve seat, the steel ball and the oil drain valve body upward.

[0007] Further preferably, it also includes an oil return valve stem movably installed in the upper cavity.

[0008] Further preferably, it also includes an oil return return spring installed between the oil return valve stem and the upper chamber for pushing the oil return valve stem to return.

[0009] Further preferably, it further comprises an oil discharge end provided on the oil return valve stem, and an oil discharge valve spring is installed on the oil discharge end and the oil discharge valve body.

[0010] The beneficial effects of the present invention are as follows: by arranging a throttling groove on the valve needle, when there is a certain load or rated load, the oil return valve stem cannot push the oil drain valve body downward to return oil, the valve needle is first pushed downward, and the valve needle pushes away the steel ball that closes the oil drain hole during the downward movement, and then discharges oil and relieves pressure through the throttling groove, forming a slow descent, until the oil return valve stem is able to push the oil drain valve body to quickly unload oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attachment Figure 1 It is a structural diagram of the utility model;

[0012] Attachment Figure 2 It is a partial enlarged structural schematic diagram of the utility model;

[0013] Attachment Figure 3 This is a schematic diagram of the structure of the valve block in the utility model;

[0014] Attachment Figure 4 It is a schematic cross-sectional view at BB in the present utility model;

[0015] Attachment Figure 5 This is a schematic diagram of the top view of the valve needle in the utility model;

[0016] Attachment Figure 6 It is a schematic diagram of the utility model when in use.

[0017] Legend: 1. Valve block; 2. Oil drain valve; 3. Oil drain valve chamber; 31. Upper chamber; 32. Lower chamber; 4. Oil drain valve seat; 5. Oil drain valve body; 51. Small valve seat; 52. Oil drain hole; 53. Valve needle; 6. Throttle groove; 61. Steel ball; 7. Return spring; 8. Oil return valve stem; 81. Oil return return spring; 82. Oil drain end; 83. Oil drain valve spring. DETAILED DESCRIPTION

[0018] Next, we will further explain the oil drain valve with a throttling structure described in the present invention with reference to the accompanying drawings.

[0019] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0020] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0021] See Figure 1-6 As shown in , an oil drain valve with a throttling structure includes a valve block 1 and an oil drain valve 2 mounted on the valve block 1; the valve block 1 is characterized in that an oil drain valve chamber 3 for mounting the oil drain valve 2 is provided, the oil drain valve chamber 3 is provided with an oil drain valve seat 4, the oil drain valve chamber 3 is formed by the oil drain valve seat 4 into an upper chamber 31 and a lower chamber 32; the oil drain valve 2 includes an oil drain valve body 5 movably connected to the lower chamber 32, a small valve seat 51 movably connected to the oil drain valve body 5, an oil drain hole 52 provided on the oil drain valve body 5, a valve needle 53 movably mounted in the oil drain hole 52, and a throttling groove 6 for throttling provided on the valve needle 53; a steel ball 61 for sealing the oil drain hole 52 is installed between the small valve seat 51 and the oil drain hole 52;

[0022] By providing a throttle groove 6 on the valve needle 53, when there is a certain load or rated load, the return oil valve stem 8 is unable to push the oil drain valve body 5 downward to return the oil. First, the valve needle 53 is pushed downward. During the downward movement, the valve needle 53 pushes away the steel ball 61 that closes the oil drain hole 52, and then releases the oil and relieves the pressure through the throttle groove 6, forming a slow drop until the return oil valve stem 8 is able to push the oil drain valve body 5 to quickly unload the oil.

[0023] In one embodiment, the throttle groove 6 is arranged at the side wall of the valve needle 53. By arranging the throttle groove 6 at the side wall, the steel ball 61 is prevented from blocking the throttle groove 6.

[0024] In one embodiment, a return spring 7 is further included in the lower chamber 32 for pushing the small valve seat 51, the steel ball 61 and the oil drain valve body 5 upward; through the setting of the return spring 7, the small valve seat 51, the steel ball 61 and the oil drain valve body 5 are pushed upward to cut off the oil circuit.

[0025] In one embodiment, it also includes an oil return valve stem 8 movably installed in the upper chamber 31; it also includes an oil return return spring 81 installed between the oil return valve stem 8 and the upper chamber 31 for pushing the oil return valve stem 8 to reset; through the setting of the oil return return spring 81, it is used to push the oil return valve stem 8 to automatically reset when oil return is not performed.

[0026] In one embodiment, it also includes an oil drain end 82 arranged on the return oil valve stem 8, and an oil drain valve spring 83 is installed on the oil drain end 82 and the oil drain valve body 5. Through the setting of the oil drain end 82, when the return oil valve stem 8 is pushed downward, the oil drain end 82 first contacts the valve needle 53 and forms a downward squeezing force on the valve needle 53. After the valve needle 53 moves downward, it pushes the steel ball 61 and the small valve seat 51 to overcome the force of the reset spring 7 and open the oil path at the oil drain hole 52, so that the oil is discharged through the throttle groove 6.

[0027] When the utility model is in use: the upper chamber 31 of the utility model is in communication with the oil tank of the equipment used, and the lower chamber 32 is in communication with the oil cylinder;

[0028] During oil return: When the oil return valve stem 8 is pushed downwards during no-load or light-load operation, the oil return valve stem 8 contacts the valve needle 53 during the downward movement of the oil discharge end 82, pushing the valve needle 53 downwards. The valve needle 53 pushes the steel ball 61 downwards, and at the same time, the oil return valve stem 8 compresses the oil discharge valve spring 83 downwards. The restoring force of the compressed oil discharge valve spring 83 is greater than the force of the restoring spring 7, pushing the oil discharge valve body 5 downwards. At this time, the oil discharge valve body 5, the oil discharge valve seat 4 and the throttle groove 6 are simultaneously unloading oil.

[0029] When there is a certain load or rated load, the return oil valve stem 8 is pushed downward. During the downward movement, the oil discharge end 82 of the return oil valve stem 8 contacts the valve needle 53 and pushes the valve needle 53 downward. While the valve needle 53 pushes the steel ball 61 downward, the return oil valve stem 8 pushes the oil discharge valve spring 83 downward for compression. At this time, due to a certain pressure in the lower chamber 32, the restoring force of the compressed oil discharge valve spring 83 still cannot push the oil discharge valve body 5. At this time, the oil is only unloaded through the throttle groove 6 and slowly lowered. During the slow lowering process, the pressure in the lower chamber 32 is released until the compression force of the oil discharge valve spring 83 is greater than the force of the reset spring 7, which pushes the oil discharge valve body 5 downward, opening the flow path between the oil discharge valve body 5 and the oil discharge valve seat 4 for quick oil unloading.

[0030] The protection scope of the present invention is not limited to the above embodiment and its variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment fall within the protection scope of the present invention.

Claims

1. An oil drain valve with a throttling structure, comprising a valve block (1) and an oil drain valve (2) mounted on the valve block (1); wherein The valve block (1) is provided with an oil drain valve chamber (3) for installing an oil drain valve (2), and an oil drain valve seat (4) is provided on the oil drain valve chamber (3). The oil drain valve chamber (3) forms an upper chamber (31) and a lower chamber (32) through the oil drain valve seat (4). The oil drain valve (2) comprises an oil drain valve body (5) movably connected in the lower chamber (32), a small valve seat (51) movably connected in the oil drain valve body (5), an oil drain hole (52) provided on the oil drain valve body (5), a valve needle (53) movably installed in the oil drain hole (52), and a throttling groove (6) provided on the valve needle (53) for throttling; a steel ball (61) for sealing the oil drain hole (52) is provided between the small valve seat (51) and the oil drain hole (52).

2. The oil drain valve with a throttling structure according to claim 1, characterized in that: The throttling groove (6) is arranged on the side wall of the valve needle (53).

3. The oil drain valve with a throttling structure according to claim 1, characterized in that: It also includes a return spring (7) disposed in the lower chamber (32) for pushing the small valve seat (51), the steel ball (61) and the oil drain valve body (5) upward.

4. The oil drain valve with a throttling structure according to claim 1, characterized in that: It also includes an oil return valve stem (8) movably mounted in the upper chamber (31).

5. The oil drain valve with a throttling structure according to claim 4, characterized in that: It also includes an oil return return spring (81) installed between the oil return valve stem (8) and the upper chamber (31) for pushing the oil return valve stem (8) to return.

6. The oil drain valve with a throttling structure according to claim 4, characterized in that: It also includes an oil discharge end (82) arranged on the oil return valve stem (8), and an oil discharge valve spring (83) is installed on the oil discharge end (82) and the oil discharge valve body (5).

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