A gas path distribution block assembly and a gas path distribution control method

Abstract

The present invention discloses an air path distribution block assembly and an air path distribution control method using the air path distribution block assembly. The air path distribution block assembly includes an air path distribution block and a vacuum generator. The air path distribution block is provided with a positive pressure air inlet, a negative pressure air inlet and a terminal connection port. The air inlet of the vacuum generator is connected with the negative pressure air inlet. The air path distribution block is provided with a distribution valve cavity. The distribution valve cavity is provided with a valve cavity air inlet, a valve cavity suction port and a valve cavity air inlet and outlet. The air path distribution block is provided with an air inlet channel, a terminal communication channel and a suction channel. A valve core is slidably installed in the distribution valve cavity. The valve core is driven by a valve core power device to connect the valve cavity air inlet and outlet with the valve cavity air inlet or the valve cavity air inlet and outlet with the valve cavity suction port. The air path distribution block assembly and the air path distribution control method ensure the switching of the air path of positive pressure output and negative pressure output while omitting a control valve, simplifying the electrical control steps, further reducing the volume and reducing the cost.

Description

Technical Field

[0001] The invention relates to an air path distribution block assembly and also relates to an air path distribution control method using the air path distribution block assembly. Background Art

[0002] At present, the switching adjustment of positive and negative pressure is a gas circuit adjustment function that is often needed in industrial production. By opening and closing different gas circuits, positive or negative pressure is generated at the same terminal port. However, at present, this gas circuit adjustment device is realized by external connecting pipelines, so that the pipelines connected to the entire gas circuit are exposed to the outside, which not only affects the appearance, but also makes it more troublesome to organize the external pipelines. In harsh use environments, the pipelines are prone to aging. Once the pipelines have problems such as air leakage, it is more troublesome to maintain them. Due to the large number of external pipelines, they need to be checked one by one, and the maintenance time is long.

[0003] In response to the above-mentioned technical problems, the applicant of the present invention applied for a utility model with patent number 201920432456.3 in 2019. In this patent document, the applicant developed an air path distribution component and a positive and negative pressure regulation integrated module using the component, which can reduce the exposure of the pipeline and avoid pipeline aging.

[0004] However, this integrated module still has some disadvantages: the positive and negative pressure regulation integrated module uses a three-way control valve and a cut-off valve to control the direction of the gas and realize the switching of positive and negative pressure outputs. However, this switching requires two valves to control, and both valves are exposed on the outside of the gas distribution component, which results in a relatively large overall volume. In addition, the three-way control valve and the cut-off valve require additional electrical control components for electrical control, which increases the control cost. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide an air path distribution block assembly, which omits a control valve while ensuring the air path switching of positive pressure output and negative pressure output, thereby simplifying the electrical control steps, further reducing the volume and reducing the cost.

[0006] The second technical problem to be solved by the present invention is to provide a gas path distribution control method, which uses the above-mentioned gas path distribution block assembly to simplify the switching control process of positive and negative pressure outputs, and the control method is simpler and more reliable.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: an air path distribution block assembly, including an air path distribution block and a vacuum generator, the air path distribution block is provided with a positive pressure air inlet, a negative pressure air inlet and a terminal connection port, the vacuum generator is fixed on the air path distribution block, the air inlet of the vacuum generator is connected with the negative pressure air inlet, the air path distribution block is provided with a distribution valve cavity, the distribution valve cavity is provided with a valve cavity air inlet, a valve cavity suction port and a valve cavity air inlet and outlet, the air path distribution block is provided with an air inlet channel connecting the valve cavity air inlet and the positive pressure air inlet, a terminal connecting channel connecting the valve cavity air inlet and outlet with the terminal connection port, and a suction channel connecting the valve cavity suction port with the air exhaust port of the vacuum generator; a valve core is slidably installed in the distribution valve cavity on the air path distribution block, and the valve core is driven by a valve core power device to slide linearly so that the valve cavity air inlet and outlet are connected with the valve cavity air inlet or the valve cavity air inlet and outlet are connected with the valve cavity suction port.

[0008] As a preferred solution, the valve core includes a valve stem which is slidably installed in the distribution valve cavity and seals with the chamber wall of the distribution valve cavity, the valve stem is provided with a negative pressure sealing section and a positive pressure sealing section, a distribution ring groove is provided between the negative pressure sealing section and the positive pressure sealing section, the inner wall of the distribution valve cavity is provided with a negative pressure matching valve seat and a positive pressure matching valve seat, the negative pressure matching valve seat is provided between the valve cavity air inlet and the valve cavity air inlet and outlet, the positive pressure matching valve seat is provided between the valve cavity suction port and the valve cavity air inlet and outlet; when the negative pressure matching valve seat is seal-fitted with the negative pressure sealing section, the distribution ring groove connects the valve cavity air inlet and outlet with the valve cavity suction port; when the positive pressure matching valve seat is seal-fitted with the positive pressure sealing section, the distribution ring groove connects the valve cavity air inlet and outlet with the valve cavity air inlet.

[0009] As a preferred solution, the valve stem is provided with a first mating section and a second mating section at both ends of the negative pressure sealing section and the positive pressure sealing section, respectively, which are convenient for sealing with the chamber wall of the distribution valve cavity. An annular groove is provided between the first mating section and the negative pressure sealing section, and an annular groove is provided between the second mating section and the positive pressure sealing section.

[0010] As a preferred solution, the negative pressure matching valve seat and the positive pressure matching valve seat are inner walls of the distribution valve cavity.

[0011] As a preferred solution, the valve core power device is a pneumatic drive device, and a drive chamber for driving the valve core to slide linearly is provided on one end of the valve core on the air path distribution block. The drive chamber is connected to the negative pressure air inlet on the air path distribution block through a drive air path or is directly connected to an external air source through a drive air path. The other end of the valve core is provided with an elastic reset part for facilitating the resetting of the valve core.

[0012] As a preferred solution, an insertion hole for facilitating the insertion of the valve core is provided on one end of the distribution valve cavity on the air path distribution block, and a sealing hole is provided on the other end of the distribution valve cavity on the air path distribution block. The valve core is inserted into the distribution valve cavity from the insertion hole, and a first sealing head is detachably fixed in the insertion hole, and a second sealing head is detachably fixed in the sealing hole, the driving air path is provided on the first sealing head, and the elastic reset member is provided between the other end of the valve core and the second sealing head.

[0013] As a preferred solution, the first plugging head and the second plugging head are threadedly installed in the insertion hole and the plugging hole respectively.

[0014] As a preferred scheme, the valve core includes a valve stem, a positive-pressure sealing valve seat and a negative-pressure sealing valve seat are fixed in the distribution valve cavity, the positive-pressure sealing valve seat and the negative-pressure sealing valve seat are respectively provided with a center hole for facilitating the sliding of the valve stem, the positive-pressure sealing valve seat and the negative-pressure sealing valve seat are respectively provided with a negative-pressure radial through hole and a positive-pressure radial through hole connected with the center hole, the negative-pressure radial through hole of the positive-pressure sealing valve seat connects the valve cavity suction port and the valve cavity air inlet and outlet, the positive-pressure radial through hole on the negative-pressure sealing valve seat connects the valve cavity air inlet and the valve cavity air inlet and outlet, the valve stem seal is slidably installed in the center hole of the positive-pressure sealing valve seat and the negative-pressure sealing valve seat, the valve stem is provided with a valve disc located between the positive-pressure sealing valve seat and the negative-pressure sealing valve seat, and the valve core power device drives the valve stem to move linearly so that the valve disc is sealed and matched with the center hole of the positive-pressure sealing valve seat or the center hole of the negative-pressure sealing valve seat.

[0015] As a preferred scheme, the positive pressure sealing valve seat and the negative pressure sealing valve seat have the same structure, the positive pressure sealing valve seat comprises a cylindrical positive pressure valve seat body, the number of the negative pressure radial through holes is multiple and is evenly distributed on the circumference of the positive pressure valve seat body, the position of the negative pressure radial through holes corresponds to the position of the valve cavity suction port, and at least two sealing rings are provided on the outer peripheral surface of the positive pressure valve seat body and the inner wall of the distribution valve cavity, and the two sealing rings are located on both sides of the valve cavity suction port.

[0016] After adopting the above technical scheme, the effect of the present invention is as follows: due to an air path distribution block assembly, including an air path distribution block and a vacuum generator, the air path distribution block is provided with a positive-pressure air inlet, a negative-pressure air inlet and a terminal connection port, the vacuum generator is fixed on the air path distribution block, the air inlet of the vacuum generator is connected with the negative-pressure air inlet, the air path distribution block is provided with a distribution valve cavity, the distribution valve cavity is provided with a valve cavity air inlet, a valve cavity suction port and a valve cavity air inlet and outlet, the air path distribution block is provided with an air inlet channel connecting the valve cavity air inlet and the positive-pressure air inlet, a terminal connecting channel connecting the valve cavity air inlet and outlet with the terminal connection port, and a suction channel connecting the valve cavity suction port with the air suction port of the vacuum generator; the air path distribution block is located at the distribution valve cavity A valve core is slidably installed in the distribution valve cavity, and the valve core is driven by the valve core power device to slide linearly so that the air inlet and outlet of the valve cavity are connected with the air inlet of the valve cavity or the air inlet and outlet of the valve cavity are connected with the suction port of the valve cavity. Therefore, the air path distribution block assembly omits the three-way control valve and the cut-off valve in the background technology when switching between positive pressure and negative pressure, and adopts a distribution valve cavity arranged on the air path distribution block to distribute the airflow, and then uses a valve core slidably installed in the distribution valve cavity to control the route of the airflow distribution, so that the switching of the airflow route is simply realized, and finally the switching of the positive pressure output or negative pressure output of the terminal connection port is realized. The air path distribution block assembly has a simple structure, omits the cut-off valve, simplifies the electrical control steps, reduces the cost, and has a smaller overall volume and a higher degree of integration.

[0017] Furthermore, since the valve core includes a valve stem which is slidably installed in the distribution valve cavity and seals with the chamber wall of the distribution valve cavity, a negative pressure sealing section and a positive pressure sealing section are provided on the valve stem, a distribution ring groove is provided between the negative pressure sealing section and the positive pressure sealing section, and a negative pressure matching valve seat and a positive pressure matching valve seat are provided on the inner wall of the distribution valve cavity, the negative pressure matching valve seat is provided between the valve cavity air inlet and the valve cavity air inlet and outlet, and the positive pressure matching valve seat is provided between the valve cavity suction port and the valve cavity air inlet and outlet; the negative pressure matching valve seat and the negative pressure matching valve seat are provided between the positive pressure matching valve seat and the negative pressure matching valve seat. When the negative pressure sealing sections are sealed together, the distribution ring groove connects the valve cavity air inlet and outlet and the valve cavity suction port; when the positive pressure matching valve seat is sealed together with the positive pressure sealing section, the distribution ring groove connects the valve cavity air inlet and outlet and the valve cavity air inlet. Therefore, the valve core structure is relatively reasonable, and the negative pressure sealing section and the positive pressure sealing section are respectively sealed together with the negative pressure matching valve seat and the positive pressure matching valve seat on the inner wall of the distribution valve cavity. In this way, the axial movement of the valve core is used to realize accurate switching of the air path, and the operation is simple and reliable.

[0018] Furthermore, since the valve stem is provided with a first mating section and a second mating section at both ends of the negative pressure sealing section and the positive pressure sealing section, respectively, which are convenient for sealing with the chamber wall of the distribution valve cavity, an annular groove is provided between the first mating section and the negative pressure sealing section, and an annular groove is provided between the second mating section and the positive pressure sealing section, the valve stem is provided with two annular grooves, which can reduce the resistance to the sliding of the valve stem, making the driving smoother, and also reducing the friction between the valve stem and the distribution valve cavity, thereby reducing the wear of the sealing ring used to achieve sealing cooperation.

[0019] Since the valve core power device is a pneumatic drive device, a drive chamber for driving the valve core to slide linearly is provided on one end of the valve core on the air path distribution block. The drive chamber is connected to the negative pressure air inlet on the air path distribution block through a drive air path or is directly connected to an external air source through a drive air path. An elastic reset part for facilitating the resetting of the valve core is provided at the other end of the valve core. The valve core power device can drive the valve core to slide with the help of an existing positive pressure air source. The driving method is simpler, especially the positive pressure gas entering the negative pressure air inlet can be diverted and then the valve core can be driven to slide synchronously. The conception is ingenious, and the control components can be further simplified, the structure can be simplified, and the cost can be reduced.

[0020] Furthermore, since an insertion hole for facilitating the insertion of the valve core is provided on one end of the distribution valve cavity on the air path distribution block, and a sealing hole is provided on the other end of the distribution valve cavity on the air path distribution block, the valve core is inserted into the distribution valve cavity from the insertion hole, a first sealing head is detachably fixed in the insertion hole, a second sealing head is detachably fixed in the sealing hole, the first sealing head is provided with the driving air path, and the elastic reset component is provided between the other end of the valve core and the second sealing head. The above structure can facilitate the assembly of the valve core and the installation of the elastic reset component.

[0021] Furthermore, since the valve core includes a valve stem, a positive-pressure sealing valve seat and a negative-pressure sealing valve seat are fixed in the distribution valve cavity, and the positive-pressure sealing valve seat and the negative-pressure sealing valve seat are respectively provided with a central hole for convenient sliding of the valve stem, and the positive-pressure sealing valve seat and the negative-pressure sealing valve seat are respectively provided with a negative-pressure radial through hole and a positive-pressure radial through hole connected with the central hole, the negative-pressure radial through hole of the positive-pressure sealing valve seat connects the valve cavity suction port and the valve cavity air inlet and outlet, and the positive-pressure radial through hole on the negative-pressure sealing valve seat connects the valve cavity air inlet and the valve cavity air inlet and outlet, and the valve stem seal is slidably installed on the positive-pressure sealing valve seat and the negative-pressure sealing valve seat. The valve stem is provided with a valve disc which is located between the positive-pressure sealing valve seat and the negative-pressure sealing valve seat in the center hole of the valve seat. The valve core power device drives the valve stem to move linearly so that the valve disc seals with the center hole of the positive-pressure sealing valve seat or the center hole of the negative-pressure sealing valve seat. The sealing reliability of the valve core is very high. The positive-pressure sealing valve seat and the negative-pressure sealing valve seat are fixed, and the sealing cooperation with the distribution chamber is a static seal. The axial sliding of the valve stem will drive the valve disc to move, thereby blocking the center hole of the positive-pressure sealing valve seat or the negative-pressure sealing valve seat. The sliding stroke of the valve stem is short, and the switching is fast while also reducing the wear of the sealing structure.

[0022] In order to solve the above second technical problem, the present invention provides a gas path distribution control method, which uses the above gas path distribution block assembly, and the gas path distribution control method includes a positive pressure output mode and a negative pressure output mode;

[0023] A1. Positive pressure output mode

[0024] The valve core power device drives the valve core to slide straightly to the positive pressure output position; the valve core gradually connects the valve cavity air inlet and outlet with the valve cavity air inlet, and gradually closes the valve cavity air inlet and outlet and the valve cavity suction port. The positive pressure gas enters from the positive pressure air inlet, enters the distribution valve cavity through the valve cavity air inlet, and then is discharged from the terminal connection port through the valve cavity air inlet and outlet to provide positive pressure output;

[0025] A2. Negative pressure output mode

[0026] The valve core power device drives the valve core to slide linearly toward the negative pressure output station; the valve core closes the valve cavity inlet and outlet and the valve cavity air inlet, and gradually connects the valve cavity inlet and outlet with the valve cavity suction port. The positive pressure gas enters from the negative pressure air inlet and passes through the vacuum generator to generate negative pressure at the vacuum generator's suction port. The gas flows from the terminal connection port through the valve cavity inlet and outlet and enters the distribution valve cavity, and then enters the vacuum generator's suction port through the valve cavity suction port. The terminal connection port provides negative pressure output.

[0027] As a preferred solution, in the gas path distribution control method, the valve core power device drives the valve core to slide linearly between the positive pressure output position and the negative pressure output position in the following manner:

[0028] B1. When the valve core needs to move from the positive pressure output position to the negative pressure output position, positive pressure gas is introduced into the negative pressure inlet and a portion of the positive pressure gas is separated to enter the drive chamber to push the valve core to move linearly, and the position is switched during the negative pressure output process;

[0029] B2. When the valve core needs to move from the negative pressure output position to the positive pressure output position, stop introducing positive pressure gas into the negative pressure air inlet, and the valve core moves from the negative pressure output position to the positive pressure output position under the elastic force of the reset elastic member.

[0030] As a preferred solution, the gas path distribution control method is used to control the opening and closing of the flexible finger, and the positive-pressure gas introduced into the positive-pressure air inlet is low-pressure gas that has been decompressed.

[0031] After adopting the above technical scheme, the effect of the present invention is: the gas path distribution control method adopts the above-mentioned gas path distribution block assembly, and uses a sliding valve core to change the gas path distribution route of the distribution valve chamber, and finally realizes the positive pressure or negative pressure switching of the terminal connection port, thereby omitting the three-way control valve and cut-off valve in the background technology, and the control method is simpler and more reliable, and the control cost is also lower.

[0032] In addition, in the gas path distribution control method, the valve core power device drives the valve core to slide linearly between the positive pressure output position and the negative pressure output position in the following manner:

[0033] B1. When the valve core needs to move from the positive pressure output position to the negative pressure output position, positive pressure gas is introduced into the negative pressure inlet and a portion of the positive pressure gas is separated to enter the drive chamber to push the valve core to move linearly, and the position is switched during the negative pressure output process;

[0034] B2. When the valve core needs to move from the negative pressure output position to the positive pressure output position, stop introducing positive pressure gas into the negative pressure air inlet, and the valve core moves from the negative pressure output position to the positive pressure output position under the elastic force of the reset elastic member. In this way, the linear sliding of the valve core utilizes part of the positive pressure gas drive of the negative pressure air inlet and the reset of the reset elastic member, which further simplifies the control method and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0036] Figure 1 is a structural cross-sectional view of embodiment 1 of the present invention when positive pressure is output;

[0037] Figure 2 is a cross-sectional view of the structure of embodiment 1 of the present invention when negative pressure is output;

[0038] Figure 3 is a cross-sectional view of the structure of embodiment 2 of the present invention when negative pressure is output;

[0039] Figure 4 is a structural cross-sectional view of embodiment 2 of the present invention when positive pressure is output;

[0040] In the attached drawings: 1. air path distribution block; 11. negative pressure air inlet; 12. positive pressure air inlet; 13. terminal connection port; 14. suction channel; 15. drive air path; 16. distribution valve chamber; 161. valve chamber air inlet; 162. valve chamber air inlet and outlet; 163. valve chamber suction port; 164. negative pressure matching valve seat; 165. positive pressure matching valve seat; 17. air inlet channel; 18. terminal connection channel; 19. drive chamber; 2. vacuum generator; 21. air inlet; 22. suction Air port; 3. Valve core; 31. Positive pressure sealing section; 32. Negative pressure sealing section; 33. First matching section; 34. Second matching section; 35. Distribution ring groove; 36. Annular groove; 37. Elastic reset member; 38. Second plugging head; 39. First plugging head; 310. Valve stem; 311. Valve disc; 4. Positive pressure sealing valve seat; 41. Positive pressure valve seat body; 42. Sealing ring; 43. Negative pressure radial through hole; 44. Center hole; 5. Negative pressure sealing valve seat; 51. Positive pressure radial through hole. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below through specific examples.

[0042] Example 1

[0043] like Figure 1 and Figure 2 As shown, an air path distribution block 1 assembly includes an air path distribution block 1 and a vacuum generator 2, wherein the vacuum generator 2 is a current existing structure, which includes an air suction port 22, an air inlet 21 and an air exhaust port.

[0044] The air path distribution block 1 is provided with a positive pressure air inlet 12, a negative pressure air inlet 11 and a terminal connection port 13. In the present embodiment, the positive pressure air inlet 12 and the negative pressure air inlet 11 are arranged on the same side of the air path distribution block 1, and the terminal connection port 13 is arranged on the other side, and is preferably opposite to the position of the positive pressure air inlet 12. The vacuum generator 2 is fixed on the air path distribution block 1, and the air inlet 21 of the vacuum generator 2 is connected with the negative pressure air inlet 11. The air path distribution block 1 is provided with a distribution valve cavity 16, and the distribution valve cavity 16 is provided with a valve cavity air inlet 161, a valve cavity suction port 163 and a valve cavity air inlet and outlet 162. In the present embodiment, preferably, the valve cavity air inlet 161 and the valve cavity air inlet and outlet 162 are arranged on one side of the distribution valve cavity, and the valve cavity suction port 163 is arranged on the other side of the distribution valve cavity, so as to facilitate the arrangement of the internal channel.

[0045] The air path distribution block 1 is provided with an air inlet channel 17 connecting the valve cavity air inlet 161 and the positive pressure air inlet 12, a terminal connecting channel 18 connecting the valve cavity air inlet and outlet 162 and the terminal connecting port 13, and a suction channel 14 connecting the valve cavity suction port 163 and the air suction port 22 of the vacuum generator 2; the air path distribution block 1 is provided with a valve core 3 slidably installed in the distribution valve cavity 16, and the valve core 3 is driven by a valve core power device to slide linearly so that the valve cavity air inlet and outlet 162 are connected with the valve cavity air inlet 161 or the valve cavity air inlet and outlet 162 are connected with the valve cavity suction port 163.

[0046] like Figure 1 and Figure 2 As shown, the valve core 3 includes a valve stem 310 which is slidably installed in the distribution valve cavity and seals with the chamber wall of the distribution valve cavity. A negative pressure sealing section 32 and a positive pressure sealing section 31 are provided on the valve stem 310. The valve stem 310 is provided with a first matching section 33 and a second matching section 34 at both ends of the negative pressure sealing section 32 and the positive pressure sealing section 31, respectively, which are convenient for sealing with the chamber wall of the distribution valve cavity. An annular groove 36 is provided between the first matching section 33 and the negative pressure sealing section 32, and an annular groove 36 is provided between the second matching section 34 and the positive pressure sealing section 31. In the present embodiment, the sealing cooperation between the valve stem 310 and the distribution valve chamber 16 adopts sealing ring cooperation, that is, annular grooves for convenient sealing ring embedding are provided on the negative pressure sealing section 32, the positive pressure sealing section 31, the first cooperation section 33 and the second cooperation section 34. Since the annular groove 36 is provided in the valve core 3, the friction between the valve stem 310 and the inner wall of the distribution valve chamber 16 can be reduced, the sliding resistance can be reduced, the wear of the sealing ring can be further reduced, and the service life can be improved.

[0047] A distribution ring groove 35 is arranged between the negative pressure sealing section 32 and the positive pressure sealing section 31, and a negative pressure matching valve seat 164 and a positive pressure matching valve seat 165 are arranged on the inner wall of the distribution valve cavity. In the present embodiment, preferably, the negative pressure matching valve seat 164 and the positive pressure matching valve seat 165 are the inner wall of the distribution valve cavity. Of course, a negative pressure matching valve seat 164 and a positive pressure matching valve seat 165 may also be additionally arranged. The negative pressure matching valve seat 164 is arranged between the valve cavity air inlet 161 and the valve cavity air inlet and outlet 162, and the positive pressure matching valve seat 165 is arranged between the valve cavity suction port 163 and the valve cavity air inlet and outlet 162; when the negative pressure matching valve seat 164 is sealed and matched with the negative pressure sealing section 32, the distribution ring groove 35 connects the valve cavity air inlet and outlet 162 with the valve cavity suction port 163; at this time, once the valve cavity suction port 163 generates negative pressure, the valve cavity air inlet and outlet 162 will take in air, and then the positive pressure gas will flow into the valve cavity suction port 163 after passing through the distribution ring groove 35; when the positive pressure matching valve seat 165 is sealed and matched with the positive pressure sealing section 31, the distribution ring groove 35 connects the valve cavity air inlet and outlet 162 with the valve cavity air inlet 161.

[0048] like Figure 1 and Figure 2 As shown, the valve core power device is a pneumatic drive device, and a drive chamber 19 for driving the valve core 3 to slide linearly is provided on one end of the gas path distribution block 1 at the valve core 3. The drive chamber 19 is connected to the negative pressure air inlet 11 on the gas path distribution block 1 through the drive air path 15 or is directly connected to the external air source through the drive air path 15. The other end of the valve core 3 is provided with an elastic reset member 37 for facilitating the reset of the valve core 3. Among them, the preferred drive air path 15 in this embodiment is connected to the negative pressure air inlet 11, so that a drive air nozzle can be omitted, and the positive pressure gas directly enters from the negative pressure air inlet 11 to drive the valve core 3 to slide.

[0049] For example Figure 1 As shown in the figure, an insertion hole for facilitating the insertion of the valve core 3 is provided on one end of the gas path distribution block 1 located in the distribution valve cavity 16, and a blocking hole is provided on the other end of the gas path distribution block 1 located in the distribution valve cavity 16. The valve core 3 is inserted into the distribution valve cavity from the insertion hole, wherein an end plate is provided on the end of the valve core 3 located in the driving chamber 19, which not only facilitates insertion but also facilitates the positive pressure gas to act on the end plate.

[0050] A first plugging head 39 is detachably fixed in the insertion hole, and a second plugging head 38 is detachably fixed in the plugging hole. The first plugging head 39 and the second plugging head 38 are threadedly installed in the insertion hole and the plugging hole, respectively. The first plugging head 39 is provided with the driving gas circuit 15, and the driving gas circuit 15 is connected to the negative pressure air inlet 11 through the distribution passage on the gas circuit distribution block 1. The elastic reset member 37 is provided between the other end of the valve core 3 and the second plugging head 38, wherein the elastic reset member 37 is preferably a spring, and of course, it can also be other elastic elements. The end of the valve stem 310 is provided with a spring placement hole for facilitating the insertion of the spring, and the second plugging head 38 is provided with a protrusion for facilitating the installation of the spring.

[0051] When maintenance is required during use of this embodiment, it is only necessary to remove the first plugging head 39 and the second plugging head 38, and then take out the valve stem and replace the sealing ring. The replacement is very convenient, and the processing of the valve stem 311 and the distribution valve chamber 16 is also relatively simple, and the cost is lower.

[0052] Example 2

[0053] The structure of this embodiment is similar to the overall structure of embodiment 1, except that the structure and sealing method of the valve core are different from those of embodiment 1.

[0054] In this embodiment, the valve core 3 includes a valve stem 310, and a positive pressure sealing valve seat 4 and a negative pressure sealing valve seat 5 are fixed in the distribution valve cavity 16. The positive pressure sealing valve seat 4 and the negative pressure sealing valve seat 5 are respectively provided with a center hole 44 for facilitating the sliding of the valve stem 310, and the positive pressure sealing valve seat 4 and the negative pressure sealing valve seat 5 are respectively provided with a negative pressure radial through hole 43 and a positive pressure radial through hole 51 connected with the center hole 44. The negative pressure radial through hole 43 of the positive pressure sealing valve seat 4 connects the valve cavity suction port 163 with the valve cavity air inlet and outlet 162, and the negative pressure radial through hole 43 of the positive pressure sealing valve seat 4 connects the valve cavity suction port 163 with the valve cavity air inlet and outlet 162. The positive pressure radial through hole 51 on the pressure sealing valve seat 5 connects the valve cavity air inlet 161 and the valve cavity air inlet and outlet 162. The valve stem 310 is sealingly slidably installed in the center hole 44 of the positive pressure sealing valve seat 4 and the negative pressure sealing valve seat 5. The valve stem 310 is provided with a valve flap 311 located between the positive pressure sealing valve seat 4 and the negative pressure sealing valve seat (5). The valve core power device drives the valve stem 310 to move linearly so that the valve flap (311) is sealed with the center hole 44 of the positive pressure sealing valve seat 4 or the center hole of the negative pressure sealing valve seat 5.

[0055] The positive pressure sealing valve seat 4 and the negative pressure sealing valve seat 5 have the same structure. The positive pressure sealing valve seat 4 includes a cylindrical positive pressure valve seat body 41. The number of the negative pressure radial through holes 43 is multiple and evenly distributed on the positive pressure valve seat body 41. The position of the negative pressure radial through holes 43 corresponds to the position of the valve cavity suction port 163. The outer circumferential surface of the positive pressure valve seat body 41 and the inner wall of the distribution valve cavity 16 are provided with at least two sealing rings 42, and the two sealing rings 42 are located on both sides of the valve cavity suction port 163. In this embodiment, the positive pressure valve seat body 41 and the negative pressure valve seat body are both made of plastic, and the positive pressure valve seat body 41 and the negative pressure valve seat body are inserted into the distribution valve cavity 16 and sealed. The valve core power device in this embodiment has the same structure as that in Embodiment 1, and also includes a driving air circuit 15 and a driving chamber 19. The driving chamber 19 is connected to the negative pressure air inlet 11 through the driving air circuit 15, and the other end of the valve stem 310 is also compressed with a spring, so that the valve flap 311 and the positive pressure sealing valve seat 4 are sealed and matched to block the center hole 44 thereof through the elastic force of the spring; at this time, the low-pressure gas enters from the positive pressure air inlet 12 and then enters into the center hole thereof through the positive pressure radial through hole 51 on the negative pressure sealing valve seat 5, and at this time the center hole of the negative pressure sealing valve seat 5 is open, so the positive pressure gas flows out directly from the valve cavity air inlet and outlet 162 through the center hole, and finally realizes the positive pressure output;

[0056] When negative pressure output is required, positive pressure gas is introduced into the negative pressure air inlet 11, part of the gas enters the vacuum generator 2, and part of the gas enters the drive chamber 19. Once positive pressure is introduced into the drive chamber 19, the valve stem 311 will squeeze the spring to make the valve flap 311 seal with the negative pressure sealing valve seat 5. At this time, the suction port 22 of the vacuum generator 2 will generate negative pressure. In this way, the gas enters from the terminal connection port 13 and enters the distribution valve chamber 16 from the valve chamber air inlet and outlet 162. Then the gas flows into the valve chamber suction port 163 through the negative pressure radial through hole 41 on the positive pressure sealing valve seat 4, and finally enters the vacuum generator 2. In this way, the terminal connection port 13 outputs negative pressure.

[0057] The valve core 3 and the sealing structure in Example 2 have a shorter movement stroke and switch more quickly. The valve stem 311 overcomes less resistance when moving, the sealing ring wears less, has a longer service life, and has higher reliability. However, the positive pressure sealing valve seat 4 and the negative pressure sealing seat 5 need to be processed and injection molded separately, which is slightly more expensive than Example 1.

[0058] Example 3

[0059] A gas path distribution control method, the gas path distribution control method uses the above-mentioned gas path distribution block 1 component, and the gas path distribution control method includes a positive pressure output mode and a negative pressure output mode;

[0060] A1. Positive pressure output mode

[0061] like Figure 1 or Figure 4 As shown, the valve core power device drives the valve core 3 to slide straightly toward the positive pressure output position; the valve core 3 gradually connects the valve cavity air inlet and outlet 162 with the valve cavity air inlet 161, and gradually closes the valve cavity air inlet and outlet 162 and the valve cavity suction port 163, and the positive pressure gas enters from the positive pressure air inlet 12 and enters the distribution valve cavity through the valve cavity air inlet 161, and then is discharged from the terminal connection port 13 through the valve cavity air inlet and outlet 162 to provide positive pressure output;

[0062] A2. Negative pressure output mode

[0063] like Figure 2 or Figure 3 As shown, the valve core power device drives the valve core 3 to slide linearly toward the negative pressure output position; the valve core 3 closes the valve cavity air inlet and outlet 162 and the valve cavity air inlet 161, and gradually connects the valve cavity air inlet and outlet 162 and the valve cavity suction port 163. The positive pressure gas enters from the negative pressure air inlet 11 and passes through the vacuum generator 2, causing the suction port 22 of the vacuum generator 2 to generate negative pressure. The gas flows from the terminal connection port 13 through the valve cavity air inlet and outlet 162 into the distribution valve cavity, and then enters the suction port 22 of the vacuum generator 2 through the valve cavity suction port 163. The terminal connection port 13 provides negative pressure output.

[0064] Among them, in this embodiment, in the gas path distribution control method, the valve core power device drives the valve core 3 to slide linearly between the positive pressure output position and the negative pressure output position in the following manner:

[0065] B1. When the valve core 3 needs to move from the positive pressure output position to the negative pressure output position, positive pressure gas is introduced into the negative pressure inlet 11 and a part of the positive pressure gas is separated to enter the driving chamber 19 to push the valve core 3 to move linearly, and the position is switched during the negative pressure output process. At this time, the valve core 3 overcomes the elastic force of the spring and remains in the negative pressure output position to ensure the continuous output of negative pressure;

[0066] B2. When the valve core 3 needs to move from the negative pressure output position to the positive pressure output position, stop introducing positive pressure gas into the negative pressure air inlet 11, and the valve core 3 moves from the negative pressure output position to the positive pressure output position under the elastic force of the reset elastic member and keeps it at the positive pressure output position, thereby ensuring continuous output of positive pressure.

[0067] The sealing method of the valve core 3 can adopt the sealing method in Example 1 or the sealing method in Example 2. The gas path distribution block 1 component and the gas path distribution control method in this embodiment are used to control the opening and closing of the flexible finger, and the positive pressure gas introduced into the positive pressure inlet 12 is a low-pressure gas after decompression. The frequent opening and closing of the flexible finger requires frequent switching of positive pressure output and negative pressure output. The gas path distribution block 1 component in this embodiment can be used on the flexible finger to reduce the volume and weight, and also reduce the cost.

[0068] Of course, the gas path distribution block 1 assembly and the gas path distribution control method in this embodiment can also be used in other places where positive pressure switching is required, especially in the case of frequent positive and negative pressure switching.

[0069] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. An air path distribution block assembly, comprising an air path distribution block (1) and a vacuum generator (2), wherein the air path distribution block (1) is provided with a positive pressure air inlet (12), a negative pressure air inlet (11) and a terminal connection port (13), the vacuum generator (2) is fixed to the air path distribution block (1), and the air inlet (21) of the vacuum generator (2) is connected to the negative pressure air inlet (11), characterized in that: The air path distribution block (1) is provided with a distribution valve cavity (16), the distribution valve cavity (16) is provided with a valve cavity air inlet (161), a valve cavity suction port (163) and a valve cavity air inlet and outlet (162), the air path distribution block (1) is provided with an air inlet channel (17) connecting the valve cavity air inlet (161) and the positive pressure air inlet (12), and a terminal connection channel connecting the valve cavity air inlet and outlet (162) and the terminal connection port (13). (18), a suction channel (14) connecting the valve cavity suction port (163) with the suction port (22) of the vacuum generator (2); a valve core (3) is slidably mounted on the gas path distribution block (1) in the distribution valve cavity (16), and the valve core (3) is driven by a valve core power device to slide linearly so that the valve cavity air inlet and outlet (162) are connected to the valve cavity air inlet (161) or the valve cavity air inlet and outlet (162) are connected to the valve cavity suction port (163).

2. A gas path distribution block assembly according to claim 1, characterized in that: The valve core (3) comprises a valve stem slidably mounted in a distribution valve cavity (16) and sealingly matched with a chamber wall of the distribution valve cavity (16); a negative pressure sealing section (32) and a positive pressure sealing section (31) are provided on the valve stem; a distribution annular groove (35) is provided between the negative pressure sealing section (32) and the positive pressure sealing section (31); a negative pressure matching valve seat (164) and a positive pressure matching valve seat (165) are provided on the inner wall of the distribution valve cavity (16); the negative pressure matching valve seat (164) is provided at the valve cavity air inlet (161) and the valve cavity air inlet and outlet ( 162), the positive pressure fitting valve seat (165) is arranged between the valve chamber suction port (163) and the valve chamber air inlet and outlet (162); when the negative pressure fitting valve seat (164) is sealed with the negative pressure sealing section (32), the distribution ring groove (35) connects the valve chamber air inlet and outlet (162) with the valve chamber suction port (163); when the positive pressure fitting valve seat (165) is sealed with the positive pressure sealing section (31), the distribution ring groove (35) connects the valve chamber air inlet and outlet (162) with the valve chamber air inlet (161).

3. A gas path distribution block assembly as claimed in claim 2, characterized in that: A first mating section (33) and a second mating section (34) are respectively provided at both ends of the negative pressure sealing section (32) and the positive pressure sealing section (31) on the valve stem, for conveniently mating with the chamber wall of the distribution valve chamber (16) in a sealed manner; an annular groove (36) is provided between the first mating section (33) and the negative pressure sealing section (32); and an annular groove (36) is provided between the second mating section (34) and the positive pressure sealing section (31).

4. A gas path distribution block assembly according to claim 1, characterized in that: The valve core power device is a pneumatic drive device. A drive chamber (19) for driving the valve core (3) to slide linearly is provided on one end of the valve core (3) on the air path distribution block (1). The drive chamber (19) is connected to the negative pressure air inlet (11) on the air path distribution block (1) through the drive air path (15) or is directly connected to an external air source through the drive air path (15). The other end of the valve core (3) is provided with an elastic reset member (37) for facilitating the reset of the valve core (3).

5. A gas path distribution block assembly as claimed in claim 4, characterized in that: An insertion hole for facilitating the insertion of the valve core (3) is provided on one end of the gas path distribution block (1) located in the distribution valve cavity (16), and a blocking hole is provided on the other end of the gas path distribution block (1) located in the distribution valve cavity (16). The valve core (3) is inserted into the distribution valve cavity (16) through the insertion hole. A first blocking head (39) is detachably fixed in the insertion hole, and a second blocking head (38) is detachably fixed in the blocking hole. The driving gas path (15) is provided on the first blocking head (39), and the elastic reset member (37) is provided between the other end of the valve core (3) and the second blocking head (38).

6. A gas path distribution block assembly as claimed in claim 1, characterized in that: The valve core (3) comprises a valve stem (310), a positive pressure sealing valve seat (4) and a negative pressure sealing valve seat (5) are fixed in the distribution valve cavity (16), the positive pressure sealing valve seat (4) and the negative pressure sealing valve seat (5) are respectively provided with a center hole (44) for facilitating the sliding of the valve stem (310), the positive pressure sealing valve seat (4) and the negative pressure sealing valve seat (5) are respectively provided with a negative pressure radial through hole (43) and a positive pressure radial through hole (51) which are connected to the center hole (44), the negative pressure radial through hole (43) of the positive pressure sealing valve seat (4) connects the valve cavity suction port (163) and the valve cavity air inlet and outlet port (162), and the negative pressure sealing valve seat (5) is provided with a positive pressure radial through hole (51) which is connected to the center hole (44). The positive pressure radial through hole (51) on the sealing valve seat (5) connects the valve cavity air inlet (161) and the valve cavity air inlet and outlet (162); the valve stem (310) is sealingly slidably installed in the center holes (44) of the positive pressure sealing valve seat (4) and the negative pressure sealing valve seat (5); the valve stem (310) is provided with a valve flap (311) located between the positive pressure sealing valve seat (4) and the negative pressure sealing valve seat (5); the valve core power device drives the valve stem (310) to move linearly so that the valve flap (311) is sealedly matched with the center hole (44) of the positive pressure sealing valve seat (4) or sealedly matched with the center hole (44) of the negative pressure sealing valve seat (5).

7. A gas path distribution block assembly according to claim 6, characterized in that: The positive pressure sealing valve seat (4) and the negative pressure sealing valve seat (5) have the same structure. The positive pressure sealing valve seat (4) comprises a cylindrical positive pressure valve seat body (41). The number of the negative pressure radial through holes (43) is multiple and the negative pressure radial through holes (43) are evenly distributed on the positive pressure valve seat body (41). The position of the negative pressure radial through holes (43) corresponds to the position of the valve cavity suction port (163). At least two sealing rings (42) are provided on the outer peripheral surface of the positive pressure valve seat body (41) and the inner wall of the distribution valve cavity (16). The two sealing rings (42) are located on both sides of the valve cavity suction port (163).

8. A gas path distribution control method, characterized in that: The gas path distribution control method uses the gas path distribution block assembly according to any one of claims 1 to 7, and the gas path distribution control method includes a positive pressure output mode and a negative pressure output mode; A1. Positive pressure output mode The valve core power device drives the valve core (3) to slide linearly toward the positive pressure output position; the valve core (3) gradually connects the valve cavity air inlet and outlet (162) with the valve cavity air inlet (161) so that the valve cavity air inlet and outlet (162) and the valve cavity suction port (163) are gradually closed, and the positive pressure gas enters from the positive pressure air inlet (12) and then enters the distribution valve cavity (16) through the valve cavity air inlet (161), and then is discharged from the terminal connection port (13) through the valve cavity air inlet and outlet (162) to provide positive pressure output; A2. Negative pressure output mode The valve core power device drives the valve core (3) to slide linearly toward the negative pressure output position; the valve core (3) closes the valve cavity air inlet and outlet (162) and the valve cavity air inlet (161), thereby gradually connecting the valve cavity air inlet and outlet (162) and the valve cavity suction port (163); the positive pressure gas enters from the negative pressure air inlet (11) and passes through the vacuum generator (2), causing the suction port (22) of the vacuum generator (2) to generate negative pressure; the gas flows from the terminal connection port (13) through the valve cavity air inlet and outlet (162) into the distribution valve cavity (16), and then enters the suction port (22) of the vacuum generator (2) through the valve cavity suction port (163); the terminal connection port (13) provides negative pressure output.

9. A gas path distribution control method according to claim 8, characterized in that: In the gas path distribution control method, the valve core power device drives the valve core (3) to slide linearly between the positive pressure output position and the negative pressure output position in the following manner: B1. When the valve core (3) needs to move from the positive pressure output position to the negative pressure output position, positive pressure gas is introduced into the negative pressure gas inlet (11) and a portion of the positive pressure gas is separated and enters the drive chamber (19) to push the valve core (3) to move linearly, and the position is switched during the negative pressure output process; B2. When the valve core (3) needs to move from the negative pressure output position to the positive pressure output position, the supply of positive pressure gas to the negative pressure air inlet (11) is stopped, and the valve core (3) moves from the negative pressure output position to the positive pressure output position under the elastic force of the resetting elastic member.

10. A gas path distribution control method according to claim 9, characterized in that: The gas path distribution control method is used to control the opening and closing of the flexible finger, and the positive pressure gas introduced into the positive pressure air inlet (12) is low pressure gas after decompression.

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