Oil pressure switch

Abstract

The oil pressure switch can normally push the plunger to move at starting. The oil pressure switch comprises a mounting cylinder, a protective shell, a micro switch, a plunger and a spring. The mounting cylinder has a mounting cavity in which the plunger is installed. The lower end of the mounting cylinder is provided with a liquid inlet channel. The plunger is provided with a stopper which divides the mounting cavity into an upper cavity and a lower cavity. The liquid inlet channel is communicated with the lower cavity. The lower end of the plunger is provided with a liquid passing channel. The spring is installed in the upper cavity. The protective shell is installed at the upper end of the mounting cylinder. The micro switch is installed in the protective shell. The upper end of the plunger is opposite to the contact of the micro switch. The lower end of the plunger covers the liquid inlet channel when the plunger is in the first position. The upper end of the plunger pushes the contact of the micro switch when the plunger is in the second position. The spring always has a tendency to push the plunger to move downward to the first position. The liquid inlet channel is communicated with the lower cavity through the liquid passing channel when the plunger is in the first position.

Description

Technical Field

[0001] This invention relates to the field of hydraulic pressure switches, and more particularly to a hydraulic pressure switch. Background Technology

[0002] In lubrication systems, pressure switches are used to detect pipeline pressure. The oil pump distributor requires sufficient pressure to supply oil, and this pressure switch provides the signal to determine whether the pressure is too high or too low. The pressure switch converts the measured oil pressure signal into a switching signal and outputs a command to open or close the circuit via a signal line. Under normal conditions, when there is no pressure or the pressure is too low to reach the activation value, the switch is closed. When the pressure in the pipeline reaches the activation pressure, it sends an open signal.

[0003] Existing pressure switches trigger a microswitch by hydraulic pressure pushing a push rod. However, during the initial machine startup, the push rod's end face area is very small, and even with sufficient pipeline pressure, it may not open, leading to false detections. Furthermore, existing pressure switches lack sufficient water resistance. Therefore, there is an urgent need for a hydraulic pressure switch that allows for normal push rod movement during startup to overcome these shortcomings. Summary of the Invention

[0004] The purpose of this invention is to provide an oil pressure switch that allows the push rod to move normally during startup.

[0005] To achieve the above objectives, the oil pressure switch of the present invention includes a mounting cylinder, a protective shell, a micro switch, a push rod, and a spring. The mounting cylinder has a mounting cavity, and the push rod is mounted in the mounting cavity. A liquid inlet channel is provided at the lower end of the mounting cylinder. A stop is provided on the push rod, which divides the mounting cavity into an upper cavity and a lower cavity. The liquid inlet channel communicates with the lower cavity. A liquid overflow channel is provided at the lower end of the push rod. The spring is mounted in the upper cavity. The protective shell is mounted at the upper end of the mounting cylinder. The micro switch is mounted inside the protective shell. The upper end of the push rod extends out of the mounting cylinder and into the protective shell. The upper end of the push rod is directly opposite the contact of the micro switch. The micro switch is located above the push rod. When the lower end of the push rod covers the liquid inlet channel on the bottom surface of the lower cavity, it is in a first position. When the upper end of the push rod pushes the contact of the micro switch, it is in a second position. The spring always has a tendency to push the push rod downward to the first position. When the push rod is in the first position, the liquid inlet channel is connected to the lower cavity through the liquid overflow channel.

[0006] Preferably, the lower end face of the push rod forms a liquid passage by slotting.

[0007] Preferably, the oil pressure switch of the present invention further includes a connector, the lower end of which is mounted on the upper end of the mounting cylinder, a protective shell is mounted on the upper end of the connector, a spring is disposed between the connector and the stop block, and a push rod extends upward.

[0008] Preferably, a first stepped surface structure is formed on the connector, and a corrugated gasket is fitted onto the connector, with the corrugated gasket positioned between the protective shell and the first stepped surface structure.

[0009] Preferably, a first annular groove is formed on the upper outer side of the connector, a first sealing ring is installed in the first annular groove, and the first sealing ring abuts against the inner wall of the protective shell. A second annular groove is formed on the outer side of the stop block, a second sealing ring is installed in the second annular groove, and the second sealing ring abuts against the side wall of the lower cavity.

[0010] Preferably, the connector has a second stepped surface structure, a third sealing ring is installed on the second stepped surface structure, the third sealing ring is pressed against the top rod, and the mounting column has an exhaust port communicating with the upper cavity.

[0011] Preferably, a fourth sealing ring is fitted on the push rod, the fourth sealing ring is located below the stop block, and the fourth sealing ring abuts against the side wall of the lower cavity.

[0012] Preferably, the protective housing is a metal housing structure, comprising a bottom housing and a top housing that covers the bottom housing, with the micro switch installed in the bottom housing, and the bottom housing locked to the connector by a locking nut.

[0013] Preferably, the left side of the bottom shell includes a first side and a second side, the second side is connected to the first side, the first side is arranged vertically, and the second side is arranged tilted to the right. The right side of the bottom shell includes a third side and a fourth side, both of which are arranged vertically and are positioned one on the left and one on the right.

[0014] Preferably, the lower end of the mounting column forms a plug-in structure, the diameter of which is smaller than the diameter of the mounting column, and the liquid inlet channel is located in the plug-in structure.

[0015] Compared with existing technologies, this invention provides a liquid passage at the lower end of the push rod. Even when the oil level in the pipeline is low, the oil can still flow into the lower chamber through the liquid passage. Once the oil pressure in the pipeline reaches a preset value, it can directly push the stop block, thereby pushing the push rod upward. The oil does not drive the push rod by pushing against its end face; instead, it is introduced into the lower chamber through the liquid passage. The oil then pushes the stop block, driving the push rod upward. The stop block has a large force-bearing area, which helps to respond quickly according to the oil pressure in the pipeline. This overcomes the problem of difficulty in pushing the push rod open due to the small end face area during the initial startup, ensuring normal push rod movement during startup. Attached Figure Description

[0016] Figure 1 This is a perspective view of the oil pressure switch of the present invention.

[0017] Figure 2This is an exploded perspective view of the oil pressure switch of the present invention.

[0018] Figure 3 This is a front sectional view of the oil pressure switch of the present invention.

[0019] Figure 4 yes Figure 3 A three-dimensional diagram of the structure shown.

[0020] Figure 5 This is a perspective view of the push rod of the present invention. Detailed Implementation

[0021] To illustrate the technical content and structural features of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0022] like Figures 1 to 4 As shown, this invention discloses an oil pressure switch 100, which includes a mounting cylinder 10, a protective shell 20, a micro switch 30, a push rod 40, and a spring 50. The mounting cylinder 10 has a mounting cavity, and the push rod 40 is mounted in the mounting cavity. A liquid inlet channel 11 is provided at the lower end of the mounting cylinder 10. A stop block 41 is provided on the push rod 40, dividing the mounting cavity into an upper cavity 12 and a lower cavity 13. The liquid inlet channel 11 communicates with the lower cavity 13. A liquid passage 42 is provided at the lower end of the push rod 40. The spring 50 is mounted in the upper cavity 12. The protective shell 20 is mounted on the upper end of the mounting cylinder 10, and the micro switch 30 is mounted inside the protective shell 20. The upper end of the push rod 40 is directly opposite the micro switch 30, and the micro switch 30 is located above the push rod 40. When the lower end of the push rod 40 covers the liquid inlet channel 11 on the bottom surface of the lower cavity 13, it is in the first position; when the upper end of the push rod 40 pushes the contact of the micro switch 30, it is in the second position. The spring 50 always has a tendency to push the push rod 40 downward to the first position. When the push rod 40 is in the first position, the liquid inlet channel 11 is connected to the lower cavity 13 through the liquid passage 42.

[0023] The working principle and usage process of the oil pressure switch 100 of the present invention are as follows: The oil pressure switch 100 of the present invention is installed in the oil pipeline of the lubrication device. When the oil pressure in the pipeline reaches a certain level, the oil flows into the inlet channel 11 and enters the lower chamber 13 through the liquid channel 42. When the oil pressure in the pipeline reaches a certain level, the upward push block 41 overcomes the elastic force of the spring 50 and drives the push rod 40 to move upward and switch from the first position to the second position. The upper end of the push rod 40 pushes the contact of the micro switch 30, thereby sending a signal of circuit opening or closing. When the oil pressure in the pipeline decreases and is insufficient to overcome the elastic force of the spring 50, the spring 50 will drive the push rod 40 to move downward and reset. At this time, the top of the push rod 40 will disengage from the contact of the micro switch 30, realizing reset.

[0024] It should also be noted that the hydraulic pressure switch 100 is available in normally open and normally closed types. The normally open type does not conduct when there is no pressure, but conducts when the pressure reaches the preset value. The normally closed type is the opposite; it conducts when there is no pressure, and disconnects when the pressure reaches the preset value.

[0025] This invention provides a liquid passage 42 at the lower end of the push rod 40. Even when the oil level in the pipeline is low, the oil can still flow into the lower chamber 13 through the liquid passage 42. Once the oil pressure in the pipeline reaches a preset value, it can directly push the stop block 41, thereby pushing the push rod 40 upwards. The oil does not drive the push rod 40 by pushing against its end face; instead, it is introduced into the lower chamber 13 through the liquid passage 42. The oil then pushes against the stop block 41, driving the push rod 40 upwards. The stop block 41 has a large force-bearing area, which helps to respond quickly according to the oil pressure in the pipeline, overcoming the problem of difficulty in opening the push rod 40 due to its small end face area during initial startup, and ensuring normal push rod movement during startup. The micro switch 30 uses an existing structure and will not be described further here.

[0026] like Figure 3 , Figure 4 and Figure 5 As shown, the lower end face of the push rod 40 forms a liquid passage 42 by means of a groove. When the push rod 40 is in the first position, the bottom surface of the push rod 40 presses against the bottom surface of the lower cavity 13, but at this time the liquid inlet channel 11 and the liquid passage 42 are connected, which facilitates the direct flow of oil into the lower cavity 13. Preferably, the liquid passage 42 formed by the groove is perpendicular to the axis of the push rod 40, but it is not limited to this.

[0027] like Figures 1 to 4 As shown, the oil pressure switch 100 of the present invention also includes a connector 60. The lower end of the connector 60 is mounted to the upper end of the mounting cylinder 10, and the protective shell 20 is mounted to the upper end of the connector 60. A spring 50 is disposed between the connector 60 and the stop block 41, and a push rod 40 extends upward. The connector 60 facilitates the installation of the protective shell 20. The connector 60 and the upper end of the mounting cylinder 60 are connected by threads, but not limited to this.

[0028] like Figures 1 to 4 As shown, a first stepped surface structure 61 is formed on the connector 60, and a corrugated gasket 70 is fitted onto the connector 60, positioned between the protective shell 20 and the first stepped surface structure 61. The corrugated gasket 70 provides a certain sealing effect, enhancing the seal between the protective shell 20 and the connector 60. Furthermore, when the mounting cylinder 10 is pushed upwards, the connector 60 is driven upwards, at which point the corrugated gasket 70 provides a floating function, allowing the mounting cylinder 10 to rotate, facilitating the installation of the hydraulic pressure switch 100.

[0029] like Figures 1 to 4 As shown, a first annular groove 62 is formed on the outer side of the upper end of the connector 60. A first sealing ring 63 is installed in the first annular groove 62 and abuts against the inner wall of the protective shell 20. A second annular groove 43 is formed on the outer side of the stop block 41, and a second sealing ring 44 is installed in the second annular groove 43 and abuts against the side wall of the lower cavity 13. The first sealing ring 63 provides a sealing function, preventing external moisture, dust, etc. from entering the protective shell 20 and improving the sealing performance of the oil pressure switch 100. The second sealing ring 44 provides a sealing function, preventing the upper cavity 12 and the lower cavity 13 from communicating and preventing oil from the lower cavity 13 from entering the upper cavity 12.

[0030] like Figures 1 to 4 As shown, the connector 60 has a second stepped surface structure 64. A third sealing ring 65 is installed on the second stepped surface structure 64. The third sealing ring 65 presses against the top rod 40, and the mounting cylinder 10 has an exhaust port 14 communicating with the upper cavity 12. It is easy to understand that when the stop block 41 moves upward, the volume of the upper cavity 12 continuously decreases, and the air pressure inside the upper cavity 12 increases. If no exhaust is provided, it will obstruct the movement of the stop block 41. This invention, by providing the exhaust port 14, draws the air out of the upper cavity 12 when the stop block 41 moves upward, preventing the air pressure from continuously increasing and allowing the stop block 41 to move smoothly. In addition, because of the exhaust port 14, outside air can enter the upper cavity 12. At this time, the third sealing ring 65 provides a sealing function, preventing external moisture, dust, etc., from entering the protective shell 20, thus improving the sealing performance of the oil pressure switch 100. The second stepped surface structure 64 facilitates the installation of the third sealing ring 65. Preferably, the third sealing ring 65 is a Y-type sealing ring, but it is not limited to this.

[0031] Of course, depending on actual needs, the exhaust port 14 may not be provided, so that the upper cavity 12 does not generate convection with the outside, and directly prevents outside air from entering the upper cavity 12. In this case, there is no need to provide a seal, that is, there is no need to provide a third sealing ring 65.

[0032] like Figures 1 to 4 As shown, a fourth sealing ring 45 is fitted onto the push rod 40. The fourth sealing ring 45 is located below the stop block 41 and presses against the side wall of the lower cavity 13. The fourth sealing ring 45 provides a sealing function, blocking the communication between the upper cavity 12 and the lower cavity 13, and preventing oil in the lower cavity 13 from flowing into the upper cavity 12. Preferably, the fourth sealing ring 45 is a Y-type sealing ring, but it is not limited to this.

[0033] like Figures 1 to 4As shown, the protective housing 20 is a metal shell structure, comprising a bottom shell 21 and a top shell 22 covering the bottom shell 21. The micro switch 30 is installed in the bottom shell 21, which is locked to the connector 60 by a locking nut 80. Using metal for the protective housing 20 provides better waterproofing, which helps to enhance the waterproof performance of the hydraulic pressure switch 100. Preferably, the protective housing 20 is made of aluminum, but it is not limited to this.

[0034] like Figures 1 to 4 As shown, the left side of the bottom shell 21 includes a first side 23 and a second side 24, with the second side 23 connected to the first side 24. The first side 23 is vertically arranged, and the second side 24 is inclined to the right. The right side of the bottom shell 21 includes a third side 25 and a fourth side 26. Both the third side 25 and the fourth side 26 are vertically arranged, and are arranged to the left and right respectively. When the oil pressure switch 100 of the present invention is used in a distributor, since the right side of the bottom shell 21 is divided into the third side 25 and the fourth side 26 arranged to the left and right respectively, a misalignment is created, which generates clearance space and avoids interference.

[0035] like Figures 1 to 4 As shown, a connector structure 15 is formed at the lower end of the mounting cylinder 10. The diameter of the connector structure 15 is smaller than the diameter of the mounting cylinder 10. The connector structure 15 facilitates the insertion of the oil pressure switch 100 into the oil pipeline. The inlet channel 11 is located in the connector structure 15.

[0036] A wire 90 is installed in the protective housing 20. The wire 90 passes through the protective housing 20 and is electrically connected to the micro switch 30.

[0037] Figure 2 The direction indicated by the middle arrow X is from left to right, and the direction indicated by the arrow Z is from bottom to top.

[0038] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are within the scope of the present invention.

Claims

1. An oil pressure switch, characterized in that: The device includes a mounting cylinder, a protective shell, a micro switch, a push rod, and a spring. The mounting cylinder has a mounting cavity, and the push rod is mounted within the mounting cavity. A liquid inlet channel is provided at the lower end of the mounting cylinder. A stop block is provided on the push rod, dividing the mounting cavity into an upper cavity and a lower cavity. The liquid inlet channel communicates with the lower cavity. A liquid overflow channel is provided at the lower end of the push rod. The spring is mounted in the upper cavity. The protective shell is mounted at the upper end of the mounting cylinder. The micro switch is mounted inside the protective shell. The upper end of the push rod... The top end of the push rod extends out of the mounting cylinder and into the protective shell. The upper end of the push rod is directly opposite the contact of the micro switch. The micro switch is located above the push rod. When the lower end of the push rod covers the liquid inlet channel on the bottom surface of the lower cavity, it is in a first position. When the upper end of the push rod pushes the contact of the micro switch, it is in a second position. The spring always has a tendency to push the push rod downward to the first position. When the push rod is in the first position, the liquid inlet channel is connected to the lower cavity through the liquid passage. The liquid passage is formed by slotting the lower end face of the push rod.

2. The oil pressure switch according to claim 1, characterized in that, It also includes a connector, the lower end of which is installed on the upper end of the mounting cylinder, the protective shell is installed on the upper end of the connector, the spring is located between the connector and the stop block, and the push rod extends upward.

3. The oil pressure switch according to claim 2, characterized in that, The connector has a first stepped surface structure, and a wave-shaped gasket is fitted onto the connector. The wave-shaped gasket is located between the protective shell and the first stepped surface structure.

4. The oil pressure switch according to claim 2, characterized in that, The upper outer side of the connector is provided with a first annular groove, in which a first sealing ring is installed and abuts against the inner wall of the protective shell. The outer side of the stop block is provided with a second annular groove, in which a second sealing ring is installed and abuts against the side wall of the lower cavity.

5. The oil pressure switch according to claim 2, characterized in that, The connector has a second stepped surface structure, and a third sealing ring is installed on the second stepped surface structure. The third sealing ring presses against the top rod, and the mounting column has an exhaust hole communicating with the upper cavity.

6. The oil pressure switch according to claim 1, characterized in that, A fourth sealing ring is fitted onto the top rod, and the fourth sealing ring is located below the stop block, pressing against the side wall of the lower cavity.

7. The oil pressure switch according to claim 2, characterized in that, The protective shell is a metal shell structure, which includes a bottom shell and a top shell covering the bottom shell. The micro switch is installed in the bottom shell, and the bottom shell is locked to the connector by a locking nut.

8. The oil pressure switch according to claim 7, characterized in that, The left side of the bottom shell includes a first side and a second side, the second side being connected to the first side. The first side is arranged vertically, and the second side is arranged tilted to the right. The right side of the bottom shell includes a third side and a fourth side, both of which are arranged vertically and are positioned to the left and right respectively.

9. The oil pressure switch according to claim 1, characterized in that, The lower end of the mounting column forms a connector structure, the diameter of which is smaller than the diameter of the mounting column, and the liquid inlet channel is located in the connector structure.

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