Vacuum pump with self-holding solenoid valve

Abstract

The utility model belongs to vacuum pump technical field, concretely relates to the vacuum pump that inlet is equipped with self -holding solenoid valve. In view of the insufficient that the solenoden of existing vacuum pump needs always power on to keep open state, not enough energy -conserving, the utility model uses the following technical scheme: the vacuum pump that inlet is equipped with self -holding solenoid valve includes: pump body, has the air inlet;Self -holding solenoid valve, is located on the air inlet;Among them, self -holding solenoid valve is structured as: when solenoid coil first power on, solenoid valve opens, when power off, solenoid valve still is in the open state;When solenoid coil second power on, solenoid valve closes, power off, solenoid valve still is in the closed state. The utility model's inlet is equipped with the vacuum pump of self -holding solenoid valve, and the air inlet of pump body is equipped with self -holding solenoid valve, and self -holding solenoid valve can keep its state under not power on, thereby when solenoid valve power on opens, need not continuously power supply to it, and power consumption is lower, and life is also longer.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum pump technology, specifically relating to a vacuum pump with a self-holding solenoid valve at the air inlet. Background Technology

[0002] Solenoid valves use electrical signals to precisely, quickly, and automatically control the on / off state or flow rate of fluids, making them an indispensable key component in modern industrial automation and fluid control systems. Solenoid valves also have wide applications in the field of vacuum pumps.

[0003] In the field of vacuum pumps, solenoid valves are generally used to control the opening and closing of the air intake passage. Normally closed solenoid valves are commonly used; the valve opens when the coil is energized and resets when de-energized. Since the coil needs to be continuously energized during vacuum pump operation, this consumes a significant amount of electricity and is not energy-efficient.

[0004] In addition, if the solenoid valve cannot close in time when the vacuum pump stops or jams due to a malfunction, it will cause leakage in the pumped system and may also cause the vacuum pump oil to flow back into the pumped system, causing system contamination. Summary of the Invention

[0005] This invention addresses the energy-inefficient drawback of existing vacuum pumps where the solenoid valve needs to be constantly energized to remain open. It provides a vacuum pump with a self-holding solenoid valve at the inlet, which can be de-energized after the solenoid valve is activated, reducing power consumption and improving energy efficiency. Furthermore, it allows the solenoid valve to disconnect promptly in the event of a vacuum pump malfunction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a vacuum pump with a self-holding solenoid valve at the air inlet, wherein the vacuum pump with a self-holding solenoid valve at the air inlet comprises:

[0007] The pump body has an air inlet;

[0008] A self-holding solenoid valve is located on the air inlet;

[0009] The self-holding solenoid valve is configured such that when the solenoid valve coil is energized for the first time, the solenoid valve opens and remains open when the power is turned off; when the solenoid valve coil is energized for the second time, the solenoid valve closes and remains closed when the power is turned off.

[0010] This invention relates to a vacuum pump with a self-holding solenoid valve at the air inlet. The self-holding solenoid valve can maintain its state when no power is applied, so that when the solenoid valve is energized and opened, there is no need to continuously supply power to it, resulting in lower power consumption and a longer lifespan. The self-holding solenoid valve is divided into single-coil type and double-coil type. Both types require power to switch between on and off states. The on and off state of the single-coil type is achieved by different currents in the coils. The on state of the double-coil type is achieved by supplying power to one of the two coils to achieve the on state, and supplying power to the other of the two coils to achieve the off state.

[0011] As an improvement, the self-holding solenoid valve is a single-coil self-holding solenoid valve. When the positive and negative terminals of the solenoid valve coil are connected to a positive DC power supply, the solenoid valve opens and remains open after the power is cut off. When the positive and negative terminals of the solenoid valve coil are connected to a reverse DC power supply, the solenoid valve closes and remains closed after the power is cut off.

[0012] As an improvement, the self-holding solenoid valve includes:

[0013] The valve body has an airflow passage and an air inlet, an air outlet, and an on / off interface connected to the airflow passage.

[0014] The active sealing assembly includes a moving iron core and a switching seal on the moving iron core;

[0015] A position holding assembly, mounted on an on / off interface, includes a spring-loaded element that orients the movable sealing assembly toward the on / off interface, a magnetic force generating assembly that orients the moving iron core toward or away from the on / off interface, and a permanent magnet that holds the moving iron core in the off position.

[0016] As an improvement, the on / off seal is tightly fitted to the moving iron core; the on / off seal is T-shaped; and the elastic element is a conical spring.

[0017] As an improvement, the on / off interface includes an outer ring and an inner ring. The outer ring is connected to the air outlet, and the inner ring is connected to the air inlet. The movable sealing assembly switches the inner ring on and off.

[0018] As an improvement, the self-holding solenoid valve also includes a fixed sealing assembly, which includes a sealing sleeve, an outer ring, a sleeve sealing ring between the sealing sleeve, and a copper nut. The copper nut is threaded to the outer ring and fixes the sealing sleeve and the outer ring together and compresses the sleeve sealing ring. The moving iron core is located in the sealing sleeve.

[0019] As an improvement, the sealing sleeve is convex in shape, and the sealing sleeve has a movable groove for the moving iron core to move. The radial convex part of the sealing sleeve is located between the outer ring and the copper nut. The end of the sealing sleeve away from the radial convex part is provided with a fastening nut. The fastening nut is threadedly connected to the sealing sleeve and locks the sealing sleeve, the magnetic force generating component and the copper nut.

[0020] As an improvement, the magnetic force generating assembly includes a magnetic coil, a magnetic yoke, and a plastic encapsulation, with a permanent magnet located in the magnetic force generating assembly and radially outside the magnetic coil.

[0021] As an improvement, the self-holding solenoid valve is a dual-coil self-holding solenoid valve. When coil A is energized, the solenoid valve opens, and after de-energization, the solenoid valve remains open. When coil B is energized, the solenoid valve closes, and after de-energization, the solenoid valve remains closed.

[0022] As an improvement, vacuum pumps with a self-holding solenoid valve at the air inlet also include:

[0023] Controller;

[0024] Electric motor;

[0025] Motor speed detection device;

[0026] During motor startup, when the motor speed detection device detects that the motor speed is greater than the first threshold, it sends a signal to the controller, which then supplies power to the self-holding solenoid valve. After the self-holding solenoid valve opens, the controller stops supplying power to it. During motor operation, when the motor speed detection device detects that the motor speed is less than the second threshold, it sends a signal to the controller, which then supplies power to the self-holding solenoid valve. After the self-holding solenoid valve closes, the controller stops supplying power to it.

[0027] The beneficial effects of the vacuum pump with a self-holding solenoid valve at the air inlet of this utility model are: the air inlet of the pump body is equipped with a self-holding solenoid valve, which can maintain its state when no power is applied, so that when the solenoid valve is energized and opened, there is no need to continuously supply power to it, resulting in lower power consumption and longer life. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a vacuum pump with a self-holding solenoid valve at the air inlet according to Embodiment 1 of this utility model.

[0029] Figure 2 This is a schematic diagram of the structure of the self-holding solenoid valve according to Embodiment 1 of this utility model.

[0030] Figure 3 This is an exploded view of the structure of the self-holding solenoid valve according to Embodiment 1 of this utility model.

[0031] Figure 4 This is a cross-sectional view of the self-holding solenoid valve according to Embodiment 1 of this utility model.

[0032] Figure 5 This is a schematic diagram of the valve body of the self-holding solenoid valve according to Embodiment 1 of this utility model.

[0033] Figure 6This is a schematic diagram of the sealing sleeve of the self-holding solenoid valve according to Embodiment 1 of this utility model.

[0034] Figure 7 This is a schematic diagram of the moving iron core of the self-holding solenoid valve according to Embodiment 1 of this utility model.

[0035] In the diagram, 01 is the pump body; 02 is the self-holding solenoid valve.

[0036] 1. Valve body; 1-1. First valve body; 1-2. Second valve body; 11. Inlet port; 12. Outlet port; 13. On / off port; 131. Outer ring; 132. Inner ring;

[0037] 2. Movable sealing assembly; 21. Moving iron core; 211. Sealing mounting groove; 212. Exhaust groove; 22. On / off seal;

[0038] 3. Position holding component; 31. Elastic component; 32. Magnetic force generating component; 321. Magnetic yoke; 322. Molded body; 33. Permanent magnet;

[0039] 4. Fixed sealing assembly; 41. Sealing sleeve; 42. Sealing ring; 43. Copper nut;

[0040] 5. Tighten the nuts;

[0041] 6. Sealing head. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be explained and described below. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0043] See Figures 1 to 7 The vacuum pump with a self-holding solenoid valve at the air inlet of this utility model embodiment includes:

[0044] The pump body has an air inlet;

[0045] A self-holding solenoid valve is located on the air inlet;

[0046] The self-holding solenoid valve is configured such that when the solenoid valve coil is energized for the first time, the solenoid valve opens and remains open when the power is turned off; when the solenoid valve coil is energized for the second time, the solenoid valve closes and remains closed when the power is turned off.

[0047] This invention relates to a vacuum pump with a self-holding solenoid valve at the air inlet. The self-holding solenoid valve can maintain its state when no power is applied, so that when the solenoid valve is energized and opened, there is no need to continuously supply power to it, resulting in lower power consumption and a longer lifespan. The self-holding solenoid valve is divided into single-coil type and double-coil type. Both types require power to switch between on and off states. The on and off state of the single-coil type is achieved by different currents in the coils. The on state of the double-coil type is achieved by supplying power to one of the two coils to achieve the on state, and supplying power to the other of the two coils to achieve the off state.

[0048] Example 1

[0049] See Figures 1 to 7 The vacuum pump with a self-holding solenoid valve 02 at the air inlet of this utility model embodiment includes:

[0050] Pump body 01 has an air inlet;

[0051] Self-holding solenoid valve 02 is located on the air inlet;

[0052] The self-holding solenoid valve 02 is configured such that when the solenoid valve coil is energized for the first time, the solenoid valve opens and remains open when the power is turned off; when the solenoid valve coil is energized for the second time, the solenoid valve closes and remains closed when the power is turned off.

[0053] In this embodiment, the self-holding solenoid valve 02 is a single-coil self-holding solenoid valve 02. When the positive and negative terminals of the solenoid valve coil are connected to a positive DC power supply, the solenoid valve opens. When the power is cut off, the solenoid valve remains in the open state. When the positive and negative terminals of the solenoid valve coil are connected to a reverse DC power supply, the solenoid valve closes. When the power is cut off, the solenoid valve remains in the closed state.

[0054] In this embodiment, the self-holding solenoid valve 02 includes:

[0055] The valve body 1 has an airflow passage and an air inlet 11, an air outlet 12 and an on / off interface 13 connected to the airflow passage;

[0056] The movable sealing assembly 2 includes a moving iron core 21 and an on / off seal 22 on the moving iron core 21;

[0057] The position holding assembly 3 is installed on the on / off interface 13 and includes a spring member 31 that causes the movable sealing assembly 2 to face the on / off interface 13, a magnetic force generating assembly 32 that causes the moving iron core 21 to face or move away from the on / off interface 13, and a permanent magnet 33 that keeps the moving iron core 21 in the off position.

[0058] In this embodiment, the on / off sealing element 22 is tightly fitted with the moving iron core 21; the on / off sealing element 22 is T-shaped; and the elastic element 31 is a conical spring.

[0059] In this embodiment, a sealing mounting groove 211 is formed at one end of the moving iron core 21 near the on / off interface 13. The sealing mounting groove 211 is a T-shaped groove. The moving iron core 21 also has a central hole that communicates with the sealing mounting groove 211, which facilitates the disassembly of the sealing mounting groove 211. The on / off seal 22 includes a large-diameter section, a small-diameter section, and a transition section between the large-diameter section and the small-diameter section. The diameter of the transition section is smaller than that of the small-diameter section.

[0060] In this embodiment, the moving iron core 21 has an axially penetrating vent groove 212, and there are two vent grooves 212 arranged symmetrically. The vent groove 212 reduces the air resistance encountered by the moving iron core 21 when the solenoid valve is opened.

[0061] In this embodiment, the on / off interface 13 includes an outer ring portion 131 and an inner ring portion 132. The outer ring portion 131 is connected to the air outlet interface 12, and the inner ring portion 132 is connected to the air inlet interface 11. The movable sealing assembly 2 switches the inner ring portion 132 on / off.

[0062] In this embodiment, the self-holding solenoid valve 02 further includes a fixed sealing assembly 4, which includes a sealing sleeve 41, an outer ring portion 131, a sealing ring 42 between the sealing sleeve 41, and a copper nut 43. The copper nut 43 is threadedly connected to the outer ring portion 131. The copper nut 43 fixes the sealing sleeve 41 and the outer ring portion 131 and compresses the sealing ring 42. The moving iron core 21 is located in the sealing sleeve 41.

[0063] In this embodiment, the sealing sleeve 41 is convex in shape, and the sealing sleeve 41 has a movable groove for the moving iron core 21 to move. The radial protrusion of the sealing sleeve 41 is located between the outer ring 131 and the copper nut 43. The end of the sealing sleeve 41 away from the radial protrusion is provided with a fastening nut 5. The fastening nut 5 is threadedly connected to the sealing sleeve 41 and locks the sealing sleeve 41, the magnetic force generating component 32 and the copper nut 43.

[0064] In this embodiment, the magnetic force generating component 32 includes a magnetic coil, a magnetic yoke 321 and a plastic encapsulation body 322, and a permanent magnet 33 is located in the magnetic force generating component 32 and is located radially outside the magnetic coil.

[0065] In other embodiments, the self-holding solenoid valve 02 can also be a dual-coil self-holding solenoid valve 02. When coil A is energized, the solenoid valve is open, and after de-energization, the solenoid valve remains open. When coil B is energized, the solenoid valve is closed, and after de-energization, the solenoid valve remains closed.

[0066] In this embodiment, the air inlet 11 of the self-holding solenoid valve 02 is vertically arranged to facilitate pipe installation. A sealing head 6 is provided on the air inlet 11 to seal it when not in operation. The air outlet 12 of the self-holding solenoid valve 02 is horizontally arranged. The on / off interface 13 of the self-holding solenoid valve 02 is horizontally arranged.

[0067] In this embodiment, the working principle of the self-holding solenoid valve 02 is as follows: In the initial state, the moving iron core 21 and the on / off sealing element 22 thereon normally block the inner ring 132 of the on / off interface 13 of the valve body 1 under the action of the elastic element 31 (the elastic force of the elastic element 31 is greater than the magnetic force of the permanent magnet 33 in the direction of movement of the moving iron core 21), and the self-holding solenoid valve 02 is in the closed state; when it needs to be opened (such as when the motor starts until the motor speed reaches a certain threshold), power is supplied to the magnetic coil of the magnetic force generating component 32 (positive current), and the magnetic coil generates a magnetic force greater than the elastic force of the elastic element 31, causing the moving iron core 21 and the on / off sealing element 22 to move away from the inner ring 132, releasing the inner ring. When part 132 is blocked, the self-holding solenoid valve 02 switches from the off state to the open state. At the same time, after the moving iron core 21 moves into place, the permanent magnet 33 can generate a force on the moving iron core 21 that is greater than that of the elastic element 31. At this time, the power supply to the magnetic coil is stopped, and the permanent magnet 33 can keep the moving iron core 21 in the on position. When it is necessary to close (such as when the motor speed is reduced to a certain threshold), the magnetic coil of the magnetic force generating component 32 is powered (directional current). The magnetic coil generates a difference greater than the magnetic force of the permanent magnet 33 minus the elastic force of the elastic element 31. Under the action of the magnetic field generated by the magnetic coil, the moving iron core 21 moves to the inner ring part 132 of the valve body 1 and returns to the initial position.

[0068] In this embodiment, the vacuum pump with a self-holding solenoid valve 02 at the air inlet further includes:

[0069] Controller;

[0070] Electric motor;

[0071] Motor speed detection device;

[0072] During motor startup, when the motor speed detection device detects that the motor speed is greater than the first threshold, it sends a signal to the controller. The controller then supplies power to the self-holding solenoid valve 02 (usually for a short period of time, such as 0.2s). After the self-holding solenoid valve 02 opens, the controller stops supplying power to it. During motor operation, when the motor speed detection device detects that the motor speed is less than the second threshold, it sends a signal to the controller. The controller then supplies power to the self-holding solenoid valve 02 (usually for a short period of time, such as 0.2s). After the self-holding solenoid valve 02 closes, the controller stops supplying power to it.

[0073] The beneficial effects of the vacuum pump with a self-holding solenoid valve 02 at the air inlet in Embodiment 1 of this utility model are as follows: The air inlet of the pump body 01 is equipped with a self-holding solenoid valve 02, which can maintain its state when not energized. Therefore, when the solenoid valve is energized and opened, it does not need to be continuously powered, resulting in lower power consumption and longer lifespan. The self-holding solenoid valve 02 adopts a single-coil type, which is simpler than the dual-coil type control circuit. It is equipped with a controller and a motor speed detection device, which controls the opening and closing of the solenoid valve according to the motor speed. In particular, when the motor speed drops to a set threshold (a certain point or a certain range) during the operation of the vacuum pump, it indicates that the vacuum pump is operating abnormally. The controller supplies power to the self-holding solenoid valve 02 to close the self-holding solenoid valve 02, thereby effectively preventing leakage or contamination.

[0074] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A vacuum pump with a self-holding solenoid valve (02) at the air inlet, characterized in that: The vacuum pump equipped with a self-holding solenoid valve (02) at the air inlet includes: Pump body (01) has an air inlet; A self-holding solenoid valve (02) is located on the air inlet; The self-holding solenoid valve (02) is configured such that: when the solenoid valve coil is energized for the first time, the solenoid valve opens; when the power is cut off, the solenoid valve remains in the open state; when the solenoid valve coil is energized for the second time, the solenoid valve closes; when the power is cut off, the solenoid valve remains in the closed state.

2. The vacuum pump with a self-holding solenoid valve (02) at the air inlet according to claim 1, characterized in that: The self-holding solenoid valve (02) is a single-coil self-holding solenoid valve (02). When the positive and negative terminals of the solenoid valve coil are connected to a positive DC power supply, the solenoid valve opens. When the power is cut off, the solenoid valve remains in the open state. When the positive and negative terminals of the solenoid valve coil are connected to a reverse DC power supply, the solenoid valve closes. When the power is cut off, the solenoid valve remains in the closed state.

3. The vacuum pump with a self-holding solenoid valve (02) at the air inlet according to claim 2, characterized in that: The self-holding solenoid valve (02) includes: The valve body (1) has an airflow passage and an air inlet (11), an air outlet (12) and an on / off interface (13) connected to the airflow passage; The movable sealing assembly (2) includes a movable iron core (21) and an on / off seal (22) on the movable iron core (21); The position holding assembly (3), installed on the on / off interface (13), includes a spring member (31) that causes the movable sealing assembly (2) to face the on / off interface (13), a magnetic force generating assembly (32) that causes the moving iron core (21) to face or move away from the on / off interface (13), and a permanent magnet (33) that keeps the moving iron core (21) in the off position.

4. The vacuum pump with a self-holding solenoid valve (02) at the air inlet as described in claim 3, characterized in that: The on / off seal (22) is tightly fitted with the moving iron core (21); the on / off seal (22) is T-shaped; the elastic element (31) is a conical spring.

5. The vacuum pump with a self-holding solenoid valve (02) at the air inlet according to claim 3, characterized in that: The on / off interface (13) includes an outer ring (131) and an inner ring (132). The outer ring (131) is connected to the air outlet (12), and the inner ring (132) is connected to the air inlet (11). The movable sealing assembly (2) switches the inner ring (132) on and off.

6. The vacuum pump with a self-holding solenoid valve (02) at the air inlet according to claim 5, characterized in that: The self-holding solenoid valve (02) also includes a fixed sealing assembly (4), which includes a sealing sleeve (41), an outer ring (131), a sleeve sealing ring (42) between the sealing sleeve (41), and a copper nut (43). The copper nut (43) is threaded to the outer ring (131). The copper nut (43) fixes the sealing sleeve (41) and the outer ring (131) and compresses the sleeve sealing ring (42). The moving iron core (21) is located in the sealing sleeve (41).

7. The vacuum pump with a self-holding solenoid valve (02) at the air inlet according to claim 6, characterized in that: The sealing sleeve (41) is convex in shape. The sealing sleeve (41) has a movable groove for the moving iron core (21) to move. The radial protrusion of the sealing sleeve (41) is located between the outer ring (131) and the copper nut (43). The end of the sealing sleeve (41) away from the radial protrusion is provided with a fastening nut (5). The fastening nut (5) is threadedly connected to the sealing sleeve (41) and locks the sealing sleeve (41), the magnetic force generating component (32) and the copper nut (43).

8. The vacuum pump with a self-holding solenoid valve (02) at the air inlet according to claim 3, characterized in that: The magnetic force generating assembly (32) includes a magnetic coil, a magnetic yoke (321) and a plastic encapsulation (322), with a permanent magnet (33) located in the magnetic force generating assembly (32) and radially outside the magnetic coil.

9. The vacuum pump with a self-holding solenoid valve (02) at the air inlet according to claim 1, characterized in that: The self-holding solenoid valve (02) is a double-coil self-holding solenoid valve (02). When coil A is energized, the solenoid valve opens. After de-energization, the solenoid valve remains open. When coil B is energized, the solenoid valve closes. After de-energization, the solenoid valve remains closed.

10. The vacuum pump with a self-holding solenoid valve (02) at the air inlet according to claim 1, characterized in that: The vacuum pump with a self-holding solenoid valve (02) at the air inlet also includes: Controller; Electric motor; Motor speed detection device; During motor startup, when the motor speed detection device detects that the motor speed is greater than the first threshold, it sends a signal to the controller, which then supplies power to the self-holding solenoid valve (02). After the self-holding solenoid valve (02) opens, the controller stops supplying power to the self-holding solenoid valve (02). During motor operation, when the motor speed detection device detects that the motor speed is less than the second threshold, it sends a signal to the controller, which then supplies power to the self-holding solenoid valve (02). After the self-holding solenoid valve (02) closes, the controller stops supplying power to the self-holding solenoid valve (02).

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