Vacuum maintaining electromagnetic valve

Abstract

The utility model relates to the technical field of vacuum electromagnetic valves, in particular to a vacuum maintaining electromagnetic valve. The utility model provides a vacuum holding solenoid valve capable of simplifying control flow and saving cost and installation space, which comprises an air outlet centralizing block, a screw rod and a valve body, an air outlet groove is arranged on the inner side of the middle of the air outlet centralizing block, the bottom of the air outlet groove of the air outlet centralizing block is communicated with a circulation groove, and screw grooves are arranged on two sides of the air outlet centralizing block. The number of the screw rods is at least two, all the screw rods are connected into the screw grooves in the two sides of the air outlet concentration block, the lower ends of the screw rods stretch out of the screw grooves of the air outlet concentration block, and the valve body is fixedly installed at the bottom of the air outlet concentration block. Positive pressure air flow and negative pressure air flow of the valve body are communicated, so that the piston rod achieves left-right reversing movement in the piston sliding groove to open and close the negative pressure air flow and the positive pressure air flow in time, separated air inlet and unified air outlet are achieved, the installation space of the electromagnetic valve is saved, the control process is simplified, and the electromagnetic valve is convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum solenoid valves, in particular to a vacuum holding solenoid valve. Background Art

[0002] Solenoid valves are industrial equipment controlled by electromagnetics. They are basic components for controlling fluid automation and belong to actuators, not limited to hydraulic and pneumatic. Vacuum solenoid valves are special valves installed on mechanical vacuum pumps. The valve and the pump are connected to the same power supply, and the opening and stopping of the pump directly controls the opening and closing of the valve. When the pump stops working or the power supply is suddenly interrupted, the valve can automatically close the vacuum system and fill the pump cavity with atmosphere through the pump's air inlet to prevent pump oil from reflux and polluting the vacuum system. The working medium suitable for vacuum solenoid valves is air and non-corrosive gases.

[0003] When using the existing vacuum solenoid valve, it is necessary to match the vacuum solenoid valve group and the positive pressure solenoid valve group respectively, and after the vacuum solenoid valve group and the positive pressure solenoid valve group are concentrated and combined, the negative pressure is provided and the positive pressure is destroyed. It is impossible to control a single solenoid valve to switch to positive pressure and destroy the negative pressure channel. The control operation of a single solenoid valve is more troublesome, and this method has a high cost for the use of the vacuum solenoid valve and occupies a large installation space.

[0004] Therefore, it is urgent to propose a vacuum holding solenoid valve that can simplify the control process, save costs and installation space. Utility Model Content

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides a vacuum holding solenoid valve which can simplify the control process, save cost and installation space.

[0006] In order to solve the above technical problems, the utility model provides a vacuum holding solenoid valve, comprising: an air outlet concentrating block, a screw rod, a valve body, a positive pressure solenoid valve, a negative pressure solenoid valve, a piston seat, a piston rod and a reset spring. An air outlet groove is provided on the inner side of the middle part of the air outlet concentrating block. The bottom of the air outlet groove of the air outlet concentrating block is connected with a flow groove, and screw grooves are provided on both sides of the air outlet concentrating block. There are at least two screw rods, all of which are connected to the screw grooves on both sides of the air outlet concentrating block, and the lower ends of the screw rods extend out of the screw grooves of the air outlet concentrating block. The valve body is installed at the bottom of the air outlet concentrating block, and the lower ends of the screw rods are connected through Threadedly connected to the top of the valve body, a positive pressure ventilation groove I is opened on the inner left side of the valve body, a negative pressure ventilation groove I is opened on the inner right side of the valve body, a piston slide groove is opened on the upper right side of the valve body, the positive pressure solenoid valve is fixedly installed on the left end surface of the valve body, and a positive pressure ventilation groove II is opened on the right side of the positive pressure solenoid valve, the negative pressure solenoid valve is installed on the right end surface of the valve body, and a negative pressure ventilation groove II is opened on the left side of the negative pressure solenoid valve, the piston seat is connected to the right end of the piston slide groove of the valve body, the piston rod is slidably connected in the piston slide groove, and the piston rod is in sliding contact with the inside of the piston seat, and the return spring is connected between the piston seat and the piston rod.

[0007] Preferably, both ends of the flow groove are connected to one end of the positive-pressure ventilation groove I and one end of the negative-pressure ventilation groove II at the same time.

[0008] Preferably, the positive-pressure vent groove I and the negative-pressure vent groove I are far away from each other, and the positive-pressure vent groove I and the negative-pressure vent groove I are adjacent to each other at one end of the bottom of the valve body.

[0009] Preferably, one end of the positive pressure ventilation groove I is connected to one end of the positive pressure ventilation groove II.

[0010] Preferably, one end of the negative pressure ventilation groove I is connected to one end of the negative pressure ventilation groove II.

[0011] Preferably, the piston seat connected in the piston slide groove contacts one end of the negative pressure solenoid valve, and the interior of the piston seat is connected to the negative pressure ventilation groove I and the flow groove.

[0012] Preferably, the piston rod slidably connected in the piston groove contacts one end of the positive pressure ventilation groove I.

[0013] Preferably, it also includes: a support frame and screws, there are at least two support frames, all of which are symmetrically connected to the outside of the positive-pressure solenoid valve and the negative-pressure solenoid valve; there are at least four screws, all of which are inserted through the holes and grooves of all the support frames and are arranged on the outside of the positive-pressure solenoid valve and the negative-pressure solenoid valve, and one end of all the screws are symmetrically extended into the inner side of the positive-pressure solenoid valve and the negative-pressure solenoid valve.

[0014] Preferably, it also includes: an anti-skid plate, which is fixedly connected to the bottom of the support frame.

[0015] Preferably, it also includes: a ventilation pipe connected to the air outlet groove at the top of the air outlet concentration block.

[0016] Beneficial effects: 1. The positive pressure airflow and the negative pressure airflow in the valve body are connected, so that the piston rod can realize left and right reversing movement in the piston slide groove to open and close the negative pressure airflow and the positive pressure airflow in time, realize separate air intake and unified air outlet, save the installation space of the solenoid valve, simplify the control process, and make the solenoid valve easy to maintain;

[0017] 2. By setting the air outlet concentrator block as a separate component, the previous use mode of the existing solenoid valve, in which the air outlet thread is directly processed on the body and the sliding thread cannot be replaced, is changed, so that the air outlet concentrator block can be directly disassembled and replaced;

[0018] 3. By reversing the piston rod, the gas flow in the positive pressure solenoid valve and the negative pressure solenoid valve is closed, which realizes the positive pressure reversal method that could not be controlled by a single solenoid valve in the past, and does not affect the vacuum degree of other solenoid valves, ensuring that the pressure of the negative pressure concentrated air inlet of the manifold is not affected by the reversal of a single solenoid valve and thus affects the negative pressure airflow pressure value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of components such as the screw groove, the screw rod and the valve body of the utility model.

[0021] Figure 3 It is a cross-sectional view of the gas outlet concentrator block, valve body, positive pressure solenoid valve and negative pressure solenoid valve of the utility model after full sectioning.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the piston seat, piston rod and return spring of the utility model.

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the supporting frame, screws, anti-skid plate and other components of the utility model.

[0024] Figure 6 This is an exploded view of the gas outlet concentrator block, valve body, positive pressure solenoid valve and negative pressure solenoid valve of the utility model after full section.

[0025] The marks in the accompanying drawings are: 1-air outlet concentrating block, 101-air outlet groove, 102-circulation groove, 103-screw groove, 104-screw rod, 2-valve body, 201-positive pressure ventilation groove I, 202-negative pressure ventilation groove I, 203-piston slide groove, 3-positive pressure solenoid valve, 301-positive pressure ventilation groove II, 4-negative pressure solenoid valve, 401-negative pressure ventilation groove II, 5-piston seat, 6-piston rod, 7-reset spring, 9-support frame, 10-screw, 11-anti-skid plate, 12-ventilation pipe. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Embodiment: A vacuum holding solenoid valve, such as Figure 1-Figure 6As shown, it includes an air outlet concentrated block 1, a screw rod 104, a valve body 2, a positive pressure solenoid valve 3, a negative pressure solenoid valve 4, a piston seat 5, a piston rod 6 and a reset spring 7. An air outlet groove 101 is opened on the inner side of the middle of the air outlet concentrated block 1. The middle position of the bottom of the air outlet groove 101 of the air outlet concentrated block 1 is connected with a flow groove 102, and screw grooves 103 are opened on both sides of the front and back of the top of the air outlet concentrated block 1; there are two screw rods 104, and the two screw rods 104 are symmetrically connected to the screw grooves 103 on the front and back sides of the air outlet concentrated block 1 through threads, and the lower ends of the screw rods 104 extend out of the screw grooves 103 of the air outlet concentrated block 1; the valve body 2 is installed on the bottom of the air outlet concentrated block 1 through the extended part of the lower end of the screw rod 104, and a positive pressure ventilation groove I201 is opened on the inner left side of the valve body 2 A negative pressure ventilation groove Ⅰ202 is provided on the right side of the valve body 2, and the air inlet and air outlet of the positive pressure ventilation groove Ⅰ201 and the negative pressure ventilation groove Ⅰ202 are respectively located at the top of the bottom end of the valve body 2, and the air inlet of the positive pressure ventilation groove Ⅰ201 and the negative pressure ventilation groove Ⅰ202 at one end of the bottom of the valve body 2 are adjacent to each other, so as to connect the positive pressure airflow pipe and the negative pressure airflow pipe at the air inlet of the positive pressure ventilation groove Ⅰ201 and the negative pressure ventilation groove Ⅰ202 at the same time, and the positive pressure ventilation groove Ⅰ201 and the negative pressure ventilation groove Ⅰ202 are far away from each other in the valve body 2, and a piston slide groove 203 is provided on the upper right side of the valve body 2; the positive pressure solenoid valve 3 is installed on the left end surface of the valve body 2 by a pin, and a positive pressure ventilation groove Ⅱ301 is provided on the right side of the positive pressure solenoid valve 3, and the positive pressure ventilation groove Ⅰ201 One end of is connected with one end of positive pressure ventilation groove Ⅱ 301. When the air flow pipe is connected to the positive pressure ventilation groove Ⅰ 201 of the valve body 2, the positive pressure air flow will first enter the positive pressure ventilation groove Ⅰ 201 and then merge into the positive pressure ventilation groove Ⅱ 301 in the positive pressure solenoid valve 3, and finally enter the positive pressure ventilation groove Ⅰ 201 again and then be transported to the circulation groove 102 and the air outlet groove 101 and output; the negative pressure solenoid valve 4 is installed on the right end surface of the valve body 2 by a pin, and a negative pressure ventilation groove Ⅱ 401 is opened on the left side of the negative pressure solenoid valve 4, and one end of the negative pressure ventilation groove Ⅰ 202 is connected with one end of the negative pressure ventilation groove Ⅱ 401; the left and right ends of the circulation groove 102 are simultaneously connected with the air outlets of the positive pressure ventilation groove Ⅰ 201 and the negative pressure ventilation groove Ⅱ 401 at the top of the valve body 2; the piston seat 5 is connected to the piston of the valve body 2 At the right end of the slide groove 203, the piston seat 5 contacts the closed surface of the left end of the negative pressure solenoid valve 4, and the piston seat 5 can convey airflow. The interior of the piston seat 5 is connected to the negative pressure ventilation groove Ⅰ202 and the circulation groove 102. When the airflow pipe is connected to the negative pressure ventilation groove Ⅰ202 of the valve body 2, the negative pressure airflow will first enter the negative pressure ventilation groove Ⅰ202 and then merge into the negative pressure ventilation groove Ⅱ401 in the negative pressure solenoid valve 4, and finally enter the negative pressure ventilation groove Ⅰ202 again, and then pass through the interior of the piston seat to be conveyed to the circulation groove 102 and the air outlet groove 101 and output; the piston rod 6 is slidably connected to the piston slide groove 203. When the positive pressure ventilation groove Ⅰ201 is connected and the airflow is input, the piston rod 6 is driven by the positive pressure airflow in the positive pressure ventilation groove Ⅰ201 to slide to the right and enter the interior of the piston seat 5;The return spring 7 is connected between the piston seat 5 and the piston rod 6. The piston rod 6 is driven by the positive pressure airflow in the positive pressure ventilation groove Ⅰ201 to slide to the right and enter the interior of the piston seat 5. At the same time, the return spring 7 is in a compressed state. When the positive pressure airflow is not connected to the positive pressure ventilation groove Ⅰ201, the return spring 7 is in an extended state and drives the piston rod 6 to slide to the left in the piston slide groove 203 to return to its original position. ;

[0028] like Figure 1 and Figure 5 As shown, it also includes: a support frame 9 and a screw 10, there are two support frames 9, a threaded matching groove is opened on the support frame 9, there are eight screws 10, the eight screws 10 are symmetrically connected to the outer sides of the positive pressure solenoid valve 3 and the negative pressure solenoid valve 4 through the threaded matching grooves on the two support frames 9, the eight screws 10 fix the two support frames 9 to the outer sides of the positive pressure solenoid valve 3 and the negative pressure solenoid valve 4, and the two support frames 9 support the positive pressure solenoid valve 3 and the negative pressure solenoid valve 4 respectively, and the screws 10 fix the support frames 9 and the positive pressure solenoid valve 3 and the negative pressure solenoid valve 4.

[0029] like Figure 5 As shown, it also includes: an anti-skid plate 11, there are two anti-skid plates 11, the two anti-skid plates 11 are connected to the bottom of the two support frames 9 by glue, the anti-skid plates 11 are made of rubber material, and the anti-skid plates 11 are used to assist in supporting the support frames 9 to prevent the support frames 9 from directly contacting the mounting surface, thereby causing wear on the bottom of the support frames 9, and further adhere to the mounting surface when the support frames 9 are installed.

[0030] like Figure 1 and Figure 6 As shown, it also includes: a ventilation pipe 12, which is connected to the air outlet groove 101 at the top of the air outlet concentration block 1 through a connector, and the outer contour of the ventilation pipe 12 matches the inner contour of the air outlet groove 101. The ventilation pipe 12 is used to assist in connecting the air outlet interface to facilitate the output of the positive pressure airflow and negative pressure airflow circulating inside the valve body 2.

[0031] Before using the solenoid valve, first use the screw rod 104 to connect the air outlet concentrating block 1 and the valve body 2 through the screw groove 103. When the air outlet concentrating block 1 needs to be disassembled, remove the screws to remove the air outlet concentrating block 1 from the valve body 2 for replacement, then install the piston rod 6, the piston seat 5 and the return spring 7 in the piston groove of the valve body 2, and then install the positive pressure solenoid valve 3 and the negative pressure solenoid valve 4 on the left and right end faces of the valve body 2 in turn, and then install the support frame 9 on the outside of the positive pressure solenoid valve 3 and the negative pressure solenoid valve 4 respectively, and use the screw 10 to fix The support frame 9 is further fixed on the positive pressure solenoid valve 3 and the negative pressure solenoid valve 4, and the anti-skid plate 11 at the bottom of the support frame 9 is used to provide an auxiliary fixing method for fixing the installed solenoid valve as a whole. Then the ventilation pipe 12 is installed in the air outlet groove 101 of the air outlet concentration block 1, thereby completing the steps of installing the solenoid valve as a whole; after the installation is completed and it needs to be used, first connect the positive and negative pressure air flow pipes to one end of the positive pressure ventilation groove Ⅰ201 and the negative pressure ventilation groove Ⅰ202 at the bottom of the valve body 2 respectively, and when performing the suction operation, turn on the power to open the negative pressure solenoid Valve 4, at this time, the force of the return spring 7 is greater than the adsorption force of the piston rod 6, the piston rod 6 is in the initial state and remains motionless, the gas circulating in the negative pressure solenoid valve 4 enters the negative pressure ventilation groove II 401, and enters the piston seat 5 through the negative pressure ventilation groove I 202 to reach the flow groove 102 of the gas outlet concentration block 1, and is output from the gas outlet groove 101; when performing the placement operation, the positive pressure solenoid valve 3 is powered on to open, the pressure in the positive pressure solenoid valve 3 will overcome the compression force of the return spring 7, so that the positive pressure gas in the positive pressure solenoid valve 3 enters the positive pressure ventilation groove Ⅱ 301 of the valve body 2 The air groove Ⅰ201 enters the piston groove, thereby pushing the piston rod 6 to slide right. The piston rod 6 will enter the piston seat 5 as it slides right, blocking the negative pressure airflow in the piston seat 5 and closing the negative pressure. At this time, the positive pressure airflow will pass through the positive pressure ventilation groove Ⅰ201 in the valve body 2, enter the circulation groove 102 and reach the air outlet groove 101, and then be output through the ventilation pipe 12. When the positive pressure solenoid valve 3 is powered off and closed, the piston rod 6 relies on the stretching force of the reset spring 7 to deform and reset in the piston slide groove 203. The piston rod 6 no longer blocks the inside of the piston seat 5. At this time, the negative pressure channel will continue to flow open.

[0032] The above-mentioned embodiments only express the preferred implementation of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications, improvements and substitutions can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A vacuum holding solenoid valve, characterized in that: include: An air outlet concentrating block (1), wherein an air outlet groove (101) is provided on the inner side of the middle of the air outlet concentrating block (1), a flow groove (102) is connected to the bottom of the air outlet groove (101) of the air outlet concentrating block (1), and screw grooves (103) are provided on both sides of the top of the air outlet concentrating block (1); A screw rod (104), at least two of the screw rods (104), all of which are symmetrically connected to the screw grooves (103) on both sides of the gas outlet concentrating block (1) through threads, and the lower ends of the screw rods (104) extend out of the screw grooves (103) of the gas outlet concentrating block (1); a valve body (2), fixedly mounted on the bottom of the gas outlet concentrating block (1), the lower ends of the screw rods (104) being connected to the top of the valve body (2) through threads, a positive pressure ventilation groove I (201) being provided on the inner left side of the valve body (2), a negative pressure ventilation groove I (202) being provided on the inner right side of the valve body (2), and a piston slide groove (203) being provided on the upper right side of the valve body (2); A positive pressure solenoid valve (3) is fixedly mounted on the left end surface of the valve body (2), and a positive pressure venting groove II (301) is provided on the right side of the positive pressure solenoid valve (3); A negative pressure solenoid valve (4) is fixedly mounted on the right end surface of the valve body (2), and a negative pressure ventilation groove II (401) is provided on the left side of the negative pressure solenoid valve (4); A piston seat (5) is connected to the right end of the piston slide groove (203) of the valve body (2); a piston rod (6) is slidably connected in the piston slide groove (203), and the piston rod (6) is in sliding contact with the inside of the piston seat (5); A return spring (7) is connected between the piston seat (5) and the piston rod (6).

2. A vacuum holding solenoid valve according to claim 1, characterized in that: Both ends of the circulation groove (102) are connected to one end of the positive pressure ventilation groove I (201) and one end of the negative pressure ventilation groove II (401) at the same time.

3. A vacuum holding solenoid valve according to claim 2, characterized in that: The positive pressure vent groove I (201) and the negative pressure vent groove I (202) are far away from each other, and the positive pressure vent groove I (201) and the negative pressure vent groove I (202) are adjacent to each other at one end of the bottom of the valve body (2).

4. A vacuum holding solenoid valve according to claim 3, characterized in that: One end of the positive pressure ventilation groove I (201) is connected to one end of the positive pressure ventilation groove II (301).

5. A vacuum holding solenoid valve according to claim 4, characterized in that: One end of the negative pressure ventilation groove I (202) is connected to one end of the negative pressure ventilation groove II (401).

6. A vacuum holding solenoid valve according to claim 5, characterized in that: The piston seat (5) connected in the piston slide groove (203) contacts one end of the negative pressure solenoid valve (4), and the interior of the piston seat (5) is connected to the negative pressure ventilation groove I (202) and the circulation groove (102).

7. A vacuum holding solenoid valve according to claim 6, characterized in that: The piston rod (6) slidably connected in the piston slide groove (203) contacts one end of the positive pressure ventilation groove I (201).

8. A vacuum holding solenoid valve according to claim 7, characterized in that include: Support frames (9), there are at least two support frames (9), all of the support frames (9) are symmetrically sleeved on the outside of the positive pressure solenoid valve (3) and the negative pressure solenoid valve (4), and all of the support frames (9) are provided with holes and grooves; Screws (10), there are at least four screws (10), all of the screws (10) are respectively inserted through the holes and grooves of all the support frames (9) and arranged on the outside of the positive pressure solenoid valve (3) and the negative pressure solenoid valve (4), and one end of all of the screws (10) symmetrically extends into the inside of the positive pressure solenoid valve (3) and the negative pressure solenoid valve (4).

9. A vacuum holding solenoid valve according to claim 8, characterized in that include: An anti-skid plate (11) is fixedly connected to the bottom of the support frame (9).

10. A vacuum holding solenoid valve according to claim 9, characterized in that include: A ventilation pipe (12), the ventilation pipe (12) is connected to the air outlet groove (101) at the top of the air outlet concentration block (1).

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