A pilot solenoid valve

Abstract

The utility model discloses a pilot solenoid valve, comprising a valve body shell, a pilot cavity is arranged in the valve body shell, a push rod is slidably connected to the pilot cavity, a connecting rod is hinged on the push rod, a first supporting block is arranged on the valve body shell, a valve is hinged on the first supporting block, the valve is hinged to the connecting rod, a second supporting block is arranged on the valve body shell, a medium passing hole is formed between the first supporting block and the second supporting block, the valve covers the medium passing hole, a damping rotation is arranged between the rotating shaft of the valve and the first supporting block, a damping adjustment mechanism is arranged between the first supporting block and the rotating shaft of the valve, a limiting mechanism corresponding to the rotating side of the valve is arranged on the valve body shell, the structure is simple, there is no complex circuit control, the cost is low, and the maintenance is simple.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic valves, and more specifically relates to a pilot electromagnetic valve. Background Art

[0002] A pilot-operated solenoid valve usually opens or closes the pilot chamber through an internal piston rod, and drives the valve in the valve body shell to open or close through the pressure difference between the medium in the pilot chamber and the medium in the pipeline. Currently, most valves are opened and closed in a straight-up and straight-down manner. A push plate is connected to the valve to form an "I" shape. The pressure difference is formed inside and outside the push plate, and driving the push plate can drive the valve to move.

[0003] For example, the patent technology disclosed in the publication number CN113339570A discloses a solenoid valve with controllable opening, which uses two solenoid valves to adjust the opening of the pipeline. The adjustment requires the cooperation of the pilot valves on the two solenoid valves.

[0004] The above-mentioned electromagnetic valve with controllable opening has a complex internal mechanical structure, a complex coordination circuit system between the two electromagnetic valves, high production cost, and large subsequent maintenance cost. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a pilot-operated solenoid valve which has a simple structure, no complex circuit control, low cost and simple maintenance.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pilot solenoid valve, comprising a valve body shell, a pilot chamber is arranged in the valve body shell, a push rod is slidably connected to the pilot chamber, a connecting rod is hinged on the push rod, a first support block is arranged on the valve body shell, a valve is hinged on the first support block, the valve is hinged to the connecting rod, a second support block is arranged on the valve body shell, a medium passing hole is formed between the first support block and the second support block, the valve covers the medium passing hole, a damping rotation is arranged between the rotating shaft of the valve and the first support block, a damping adjustment mechanism is arranged between the first support block and the rotating shaft of the valve, and a limiting mechanism corresponding to the rotating side of the valve is arranged on the valve body shell.

[0007] Furthermore, a damping friction layer is arranged between the rotating shaft of the valve and the axial hole on the first support block, and the damping adjustment mechanism includes an adjusting rod rotatably connected to the outside of the valve body shell, and a clamping block is arranged on the rotating shaft of the adjusting rod. The clamping block is threadedly connected to the valve body shell, and one end of the rotating shaft of the valve is in contact with the clamping block.

[0008] Furthermore, a torsion spring is arranged between the rotating shaft of the valve and the axial hole on the first support block, and the damping adjustment mechanism includes an adjusting rod located outside the valve body shell, and a clamping block is arranged on the adjusting rod, and the clamping block is rotatably connected to the valve body shell, the clamping block is connected to one end of the torsion spring, and the other end of the torsion spring is connected to the rotating shaft of the valve, and a fixing device is arranged between the adjusting rod and the valve body shell.

[0009] Furthermore, the limiting mechanism includes a screw threadedly connected to the valve body shell, an adjustment block rotatably connected to the end of the screw, and a limiting rod slidably connected to the valve body shell, and the adjustment block and the limiting rod are connected and contacted via a wedge surface.

[0010] Furthermore, a spring is sleeved on the limiting rod.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the pipeline cavity on the left side of the valve body shell is connected to the pilot cavity above the valve body shell through the upper channel; when the medium pressure in the pilot cavity is greater than the medium pressure in the left pipeline cavity, the medium in the pilot cavity pushes the push rod downward, and then the valve closes the medium through the hole between the first support block and the second support block through the linkage of the connecting rod, thereby cutting off the flow of the medium; when the medium pressure in the left pipeline cavity is greater than the medium pressure in the pilot cavity, the medium in the left pipeline cavity will push the valve open, thereby allowing the medium to flow to the right pipeline cavity, thereby realizing the flow of the medium; the degree of opening of the valve is adjusted by adjusting the damping of the valve rotation, and the degree of opening of the valve can also be limited by a limit mechanism, and its structure is simple, without complex circuit control, low cost, and simple maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the internal structure of the pilot-operated solenoid valve in the first embodiment of the utility model;

[0013] Figure 2 This is a schematic diagram of the external structure of the pilot-operated solenoid valve in Example 1 of the utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the limit mechanism in the pilot-operated solenoid valve in Example 1 of the utility model;

[0015] Figure 4 This is a schematic diagram of the external structure of the pilot solenoid valve in Example 2 of the present utility model.

[0016] Figure numerals: valve body housing 1; pilot chamber 2; push rod 3; connecting rod 4; first support block 5; valve 6; second support block 7; medium passage hole 8; adjusting rod 9; pressing block 10; screw rod 11; adjusting block 12; limiting rod 13; spring 14; fixing block 15; fixing hole 16. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.

[0019] Reference Figures 1 to 4 The utility model is further described.

[0020] Embodiment 1:

[0021] A pilot solenoid valve comprises a valve body shell 1, wherein a pilot chamber 2 is arranged in the valve body shell 1, a push rod 3 is slidably connected to the pilot chamber 2, a connecting rod 4 is hinged to the push rod 3, a first support block 5 is arranged on the valve body shell 1, a valve 6 is hinged to the first support block 5, the valve 6 is hinged to the connecting rod 4, a second support block 7 is arranged on the valve body shell 1, a medium passage hole 8 is formed between the first support block 5 and the second support block 7, the valve 6 covers the medium passage hole 8, a damping rotation is arranged between the rotating shaft of the valve 6 and the first support block 5, a damping adjustment mechanism is arranged between the first support block 5 and the rotating shaft of the valve 6, and a limiting mechanism corresponding to the rotating side of the valve 6 is arranged on the valve body shell 1.

[0022] like Figures 1 to 3 As shown, the pipeline cavity on the left side of the valve body shell 1 is connected to the pilot cavity 2 above the valve body shell 1 through the upper channel. When the medium pressure in the pilot cavity 2 is greater than the medium pressure in the left pipeline cavity, the medium in the pilot cavity 2 pushes the push rod 3 downward, and then the valve 6 closes the medium through the hole 8 between the first support block 5 and the second support block 7 through the linkage of the connecting rod 4, thereby cutting off the flow of the medium; when the medium pressure in the left pipeline cavity is greater than the medium pressure in the pilot cavity 2, the medium in the left pipeline cavity will push open the valve 6, thereby allowing the medium to flow to the right pipeline cavity, thereby realizing the flow of the medium.

[0023] The opening degree of the valve 6 can be adjusted by adjusting the damping of the valve 6 rotation, and the opening degree of the valve 6 can also be limited by a limit mechanism. It has a simple structure, no complex circuit control, low cost and simple maintenance.

[0024] like Figure 2 As shown, in this example, preferably, a damping friction layer is arranged between the rotating shaft of the valve 6 and the axial hole on the first support block 5, and the damping adjustment mechanism includes an adjusting rod 9 rotatably connected to the outside of the valve body shell 1, and a clamping block 10 is arranged on the rotating shaft of the adjusting rod 9. The clamping block 10 is threadedly connected to the valve body shell 1, and one end of the rotating shaft of the valve 6 is in contact with the clamping block 10.

[0025] The adjusting rod 9 is rotated to drive the pressing block 10 to screw in or out, thereby changing the degree of pressing on the rotating shaft of the valve 6 and changing the friction between the rotating shaft of the valve 6 and the pressing block 10 .

[0026] like Figure 1 and Figure 2 As shown, in this example, preferably, the limiting mechanism includes a screw 11 threadedly connected to the valve body shell 1, an adjusting block 12 rotatably connected to the end of the screw 11, and a limiting rod 13 slidably connected to the valve body shell 1, and the adjusting block 12 and the limiting rod 13 are connected and contacted by a wedge surface.

[0027] When the screw 11 is rotated, the adjusting block 12 is synchronously driven to slide, and the limit rod 13 is caused to slide through the connection between the wedge surfaces, thereby changing the length of the extended end of the limit rod 13 and changing the maximum opening degree of the valve 6.

[0028] like Figure 3 As shown, in this example, preferably, a spring 14 is sleeved on the limit rod 13 to facilitate the limit rod 13 to slide up and reset.

[0029] Embodiment 2:

[0030] A pilot solenoid valve comprises a valve body shell 1, wherein a pilot chamber 2 is arranged in the valve body shell 1, a push rod 3 is slidably connected to the pilot chamber 2, a connecting rod 4 is hinged to the push rod 3, a first support block 5 is arranged on the valve body shell 1, a valve 6 is hinged to the first support block 5, the valve 6 is hinged to the connecting rod 4, a second support block 7 is arranged on the valve body shell 1, a medium passage hole 8 is formed between the first support block 5 and the second support block 7, the valve 6 covers the medium passage hole 8, a damping rotation is arranged between the rotating shaft of the valve 6 and the first support block 5, a damping adjustment mechanism is arranged between the first support block 5 and the rotating shaft of the valve 6, and a limiting mechanism corresponding to the rotating side of the valve 6 is arranged on the valve body shell 1.

[0031] In this example, preferably, a torsion spring (not shown in the drawings) is arranged between the rotating shaft of the valve 6 and the axial hole on the first support block 5, and the damping adjustment mechanism includes an adjusting rod 9 located outside the valve body shell 1, and a clamping block 10 is arranged on the adjusting rod 9, and the clamping block 10 is rotatably connected to the valve body shell 1, the clamping block 10 is connected to one end of the torsion spring, and the other end of the torsion spring is connected to the rotating shaft of the valve 6, and a fixing device is arranged between the adjusting rod 9 and the valve body shell 1.

[0032] The torsion force of the torsion spring is adjusted by rotating the pressing block 10 , thereby changing the resistance when the valve 6 is opened.

[0033] like Figure 4 As shown, in this example, preferably, the fixing device includes a plurality of fixing blocks 15 located on the valve body shell 1, and one end of the adjusting rod 9 connected to the clamping block 10 is telescopically connected via a spline, and the other end of the adjusting rod 9 is provided with a fixing hole 16 corresponding to the fixing block 15, and the fixing hole 16 is matched and connected with the fixing blocks 15 at different positions, so that the clamping block 10 can be rotated and fixed to different positions.

[0034] The other technical features in this example are the same as those in Example 1.

[0035] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A pilot solenoid valve, comprising a valve body shell, wherein a pilot cavity is arranged in the valve body shell, and characterized in that: A push rod is slidably connected to the pilot chamber, a connecting rod is hinged on the push rod, a first support block is arranged on the valve body shell, a valve is hinged on the first support block, the valve is hinged to the connecting rod, a second support block is arranged on the valve body shell, a medium passing hole is formed between the first support block and the second support block, the valve covers the medium passing hole, a damping rotation is arranged between the valve shaft and the first support block, a damping adjustment mechanism is arranged between the first support block and the valve shaft, and a limiting mechanism corresponding to the rotating side of the valve is arranged on the valve body shell.

2. The pilot-operated solenoid valve according to claim 1, characterized in that: A damping friction layer is arranged between the rotating shaft of the valve and the axial hole on the first support block. The damping adjustment mechanism includes an adjusting rod rotatably connected to the outside of the valve body shell. A clamping block is arranged on the rotating shaft of the adjusting rod. The clamping block is threadedly connected to the valve body shell, and one end of the rotating shaft of the valve is in contact with the clamping block.

3. The pilot-operated solenoid valve according to claim 1, characterized in that: A torsion spring is arranged between the rotating shaft of the valve and the axial hole on the first support block. The damping adjustment mechanism includes an adjusting rod located outside the valve body shell. A clamping block is arranged on the adjusting rod. The clamping block is rotatably connected to the valve body shell. The clamping block is connected to one end of the torsion spring, and the other end of the torsion spring is connected to the rotating shaft of the valve. A fixing device is arranged between the adjusting rod and the valve body shell.

4. The pilot-operated solenoid valve according to any one of claims 1 to 3, characterized in that: The limiting mechanism comprises a screw threadedly connected to the valve body shell, an adjusting block rotatably connected to the end of the screw, and a limiting rod slidably connected to the valve body shell, and the adjusting block and the limiting rod are connected and contacted via a wedge surface.

5. The pilot-operated solenoid valve according to claim 4, characterized in that: A spring is sleeved on the limiting rod.

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