Cavity insert structure for diaphragm vacuum pump cavity

Abstract

The utility model belongs to the technical field of diaphragm vacuum pumps, and relates to a cavity insert structure for a diaphragm vacuum pump cavity. The air chamber valve seat comprises an air chamber valve seat, and the front face of the air chamber valve seat is provided with a first injection molding material containing cavity. The air chamber valve seat is integrally formed by metal materials and is high in strength, the surface of the air chamber valve seat is coated with the Teflon coating, the air chamber valve seat has a good anti-corrosion effect, PTFE embedded layers attached to the air chamber valve seat are formed by injecting the metal materials into the first injection molding material containing cavity and the second injection molding material containing cavity in an injection molding mode, the middle layer is adopted as a metal piece, and therefore the air chamber valve seat is not prone to falling off. The upper layer and the lower layer are in the form of embedded layer diaphragms to form a sandwich structure, so that the strength of the whole structure is enhanced, the corrosion resistance is high, the service life of the vacuum pump diaphragm is prolonged, the cylinder collision phenomenon caused by the fact that the vacuum pump diaphragm collides with a cylinder due to deformation can be avoided, and the failure rate is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of diaphragm vacuum pumps and relates to a cavity insert structure for a pump cavity of a diaphragm vacuum pump. Background Art

[0002] The diaphragm vacuum pump is an essential laboratory device, primarily used in the fields of medical and pharmaceutical product analysis, fine chemicals, biopharmaceuticals, and public security and criminal investigation technology. During use, the diaphragm vacuum pump comes into contact with various chemical substances, which often contain corrosive elements. Conventional aluminum alloys cannot meet corrosion resistance requirements. Currently, the cavity inserts used in the diaphragm vacuum pump cavity utilize a diaphragm formed by an aluminum ring and PTFE rod stock. In actual use, the overall structural strength and diaphragm lifespan are limited due to the lack of structural support in the middle of the aluminum ring. Furthermore, deformation of the diaphragm can easily impact the vacuum pump cylinder, leading to a high failure rate.

[0003] To overcome the shortcomings of the existing technology, researchers have continuously explored and proposed various solutions. For example, a Chinese patent discloses an anti-corrosion sealing structure for a diaphragm vacuum pump [Application No.: 201420086874.9], which includes a housing, a motor, a diaphragm, a valve seat, a valve plate, an intake valve head, and an exhaust valve head. The housing is a symmetrical structure with an eccentric wheel mounted on it. Two connecting rods are mounted on the eccentric wheel. The housing is connected to a valve seat on each side. The housing and each valve seat press against the edge of a diaphragm, forming a sealed space between the diaphragms. Two connecting rods are connected to the two diaphragms. Each valve seat is provided with two air vents on the side away from the housing, one for intake and one for exhaust. The two air vents on the same side are connected to an intake valve head and an exhaust valve head, respectively. A valve plate is installed between the two air vents in the valve seat and the intake and exhaust valve heads, respectively. The exhaust valve head on one side is connected to the intake valve head on the other side by a pipeline. The intake valve head on one side is connected to the filtered equipment, while the exhaust valve head on the other side is connected to the outside world. However, in actual use, this solution still cannot provide all-round support for the diaphragm. The diaphragm is still prone to deformation, and after deformation, the diaphragm is prone to hit the vacuum pump cylinder, causing a cylinder collision phenomenon. There are defects such as the overall structural strength and diaphragm service life are relatively average and the failure rate is relatively high. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems and provide a cavity insert structure for a diaphragm vacuum pump cavity.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A cavity insert structure for a diaphragm vacuum pump chamber includes an air chamber valve seat, the front of the air chamber valve seat has a first injection plastic accommodating chamber, the back of the air chamber valve seat has a second injection plastic accommodating chamber and a plurality of mounting columns located in the second injection plastic accommodating chamber, the air chamber valve seat is made of a metal material, the first injection plastic accommodating chamber and the second injection plastic accommodating chamber are injection-molded and filled with PTFE embedding layers, the PTFE embedding layer located in the first injection plastic accommodating chamber is called a first diaphragm, and the PTFE embedding layer located in the second injection plastic accommodating chamber is called a second diaphragm, and a valve seat exhaust portion and a valve seat air inlet portion are provided between the first diaphragm and the second diaphragm.

[0007] In the above-mentioned cavity insert structure for the pump chamber of the diaphragm vacuum pump, the air chamber valve seat is penetrated by a preset exhaust port and a preset air inlet, one end of which is connected to the first injection plastic accommodating chamber and the other end of which is connected to the second injection plastic accommodating chamber. The valve seat exhaust part is located in the preset exhaust port, and the valve seat air inlet part is located in the preset air inlet.

[0008] In the above-mentioned cavity insert structure for the pump cavity of the diaphragm vacuum pump, the valve seat exhaust portion includes an exhaust hole provided in the preset exhaust port, and the cross-sectional area of the exhaust hole is smaller than the cross-sectional area of the preset exhaust port.

[0009] In the above-mentioned cavity insert structure for the pump cavity of the diaphragm vacuum pump, the exhaust hole has a plurality of ribs arranged radially at equal angles, and the ribs are integrally formed with the connecting surface between the first diaphragm and the second diaphragm located in the preset exhaust port.

[0010] In the above-mentioned cavity insert structure for the pump cavity of the diaphragm vacuum pump, the valve seat air inlet portion includes an air inlet hole provided in the preset air inlet port, and the cross-sectional area of the air inlet hole is smaller than the cross-sectional area of the preset air inlet port.

[0011] In the above-mentioned cavity insert structure for the pump chamber of the diaphragm vacuum pump, the air chamber valve seat has several diaphragm connecting holes connecting the first injection plastic accommodating chamber and the second injection plastic accommodating chamber, and the PTFE insert layer injection-molded and filled in the first injection plastic accommodating chamber and the second injection plastic accommodating chamber extends into the diaphragm connecting holes.

[0012] In the above-mentioned cavity insert structure for the pump cavity of the diaphragm vacuum pump, the bottom of the first injection molding material accommodating cavity is bowl-shaped.

[0013] In the above-mentioned cavity insert structure for the pump cavity of the diaphragm vacuum pump, the front surface of the air chamber valve seat has an annular injection groove connected to the first injection material accommodating cavity.

[0014] In the above-mentioned cavity insert structure for the pump cavity of the diaphragm vacuum pump, the second diaphragm has a shaft sleeve sleeved on the mounting column, and the shaft sleeve and the second diaphragm are integrally formed.

[0015] In the above-mentioned cavity insert structure for the pump cavity of the diaphragm vacuum pump, the PTFE insert layer is made of polytetrafluoroethylene, and the air chamber valve seat is made of aluminum material.

[0016] Compared with the existing technology, the advantages of this utility model are:

[0017] 1. The air chamber valve seat in the present invention is integrally formed of a metal material with high strength and a Teflon coating on the surface, which has good anti-corrosion effect. It is injected into the first injection molding plastic accommodating chamber and the second injection molding plastic accommodating chamber in the form of injection molding to form a PTFE embedded layer that fits the air chamber valve seat. The valve seat exhaust part and the valve seat air intake part are used for exhaust and air intake, and control the expansion or contraction of the first diaphragm and the second diaphragm. The middle layer is a metal part, and the upper and lower layers are embedded diaphragms to form a "sandwich" sandwich structure. On the one hand, the strength of the overall structure is enhanced, the corrosion resistance is strong, and the service life of the vacuum pump diaphragm is increased. On the other hand, it can avoid the vacuum pump diaphragm from hitting the cylinder body due to deformation, thereby reducing the failure rate.

[0018] 2. The PTFE embedded layer in the present invention is made of polytetrafluoroethylene (PTFE), also known as Teflon, which has good mechanical properties, can withstand harsh temperature and environmental conditions, is resistant to chemical corrosion, can withstand the nuisance of a large amount of harmful gases, has good resistance to humid environments, good anti-static properties, good resistance to surface contamination, strong alkali resistance, good tensile strength and resistance to compression tenderness. The air chamber valve seat is made of aluminum material, which has good corrosion resistance and high strength.

[0019] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a structural diagram of the utility model in another direction.

[0022] Figure 3 It is a structural diagram of the air chamber valve seat.

[0023] Figure 4 It is a structural diagram of the air chamber valve seat in another direction.

[0024] In the figure: air chamber valve seat 1, diaphragm connecting hole 1a, first injection plastic accommodating chamber 2, annular injection groove 2a, second injection plastic accommodating chamber 3, mounting column 4, PTFE embedding layer 5, first diaphragm 5a, second diaphragm 5b, sleeve 5b1, valve seat exhaust part 6, exhaust hole 6a, rib 6a1, valve seat air inlet part 7, air inlet hole 7a, preset exhaust port 8, preset air inlet port 9. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown, a cavity insert structure for a diaphragm vacuum pump chamber includes an air chamber valve seat 1, the front of the air chamber valve seat 1 has a first injection plastic accommodating chamber 2, the back of the air chamber valve seat 1 has a second injection plastic accommodating chamber 3 and a plurality of mounting columns 4 located in the second injection plastic accommodating chamber 3, the air chamber valve seat 1 is made of metal material, the first injection plastic accommodating chamber 2 and the second injection plastic accommodating chamber 3 are injection-molded and filled with a PTFE embedding layer 5, the PTFE embedding layer 5 located in the first injection plastic accommodating chamber 2 is called a first diaphragm 5a, and the PTFE embedding layer 5 located in the second injection plastic accommodating chamber 3 is called a second diaphragm 5b, and a valve seat exhaust portion 6 and a valve seat air inlet portion 7 are provided between the first diaphragm 5a and the second diaphragm 5b.

[0027] In this embodiment, the air chamber valve seat 1 is integrally formed of a metal material with high strength, and is coated with a Teflon coating on the surface, which has good anti-corrosion effect. PTFE is injected into the first injection molding plastic accommodating chamber 2 and the second injection molding plastic accommodating chamber 3 in the form of injection molding to form a PTFE embedding layer 5 that fits the air chamber valve seat 1. The valve seat exhaust portion 6 and the valve seat air intake portion 7 are used for exhaust and air intake, and control the expansion or contraction of the first diaphragm 5a and the second diaphragm 5b. The middle layer is a metal part, and the upper and lower layers are PTFE embedding layer 5 diaphragms to form a "sandwich" interlayer structure. On the one hand, the strength of the overall structure is enhanced, the corrosion resistance is strong, and the service life of the vacuum pump diaphragm is increased. On the other hand, it can avoid the vacuum pump diaphragm from hitting the cylinder body due to deformation, thereby reducing the failure rate.

[0028] Combine Figure 1-4 As shown, the air chamber valve seat 1 is penetrated by a preset exhaust port 8 and a preset air inlet 9, one end of which is connected to the first injection plastic accommodating chamber 2 and the other end of which is connected to the second injection plastic accommodating chamber 3. The valve seat exhaust portion 6 is located in the preset exhaust port 8, and the valve seat air inlet portion 7 is located in the preset air inlet 9.

[0029] Specifically, the preset exhaust port 8 is pre-punched for accommodating the valve seat exhaust portion 6 , and the preset air inlet 9 is pre-punched for accommodating the valve seat air inlet portion 7 .

[0030] Combine Figure 1 、 Figure 2 As shown, the valve seat exhaust portion 6 includes an exhaust hole 6a arranged in the preset exhaust port 8, the cross-sectional area of the exhaust hole 6a is smaller than the cross-sectional area of the preset exhaust port 8, and the exhaust hole 6a has a plurality of ribs 6a1 arranged radially at equal angles, and the ribs 6a1 are integrally formed with the connecting surface between the first diaphragm 5a and the second diaphragm 5b located in the preset exhaust port 8.

[0031] In this embodiment, the PTFE embedded layer 5 injection-molded and filled in the first injection molding material accommodating chamber 2 and the second injection molding material accommodating chamber 3 extends into the preset exhaust port 8 to form an exhaust hole 6a, which plays the role of exhaust. The exhaust hole 6a has a plurality of ribs 6a1 arranged radially at equal angles, which not only ensures sufficient gas channel area, but also effectively supports the first diaphragm 5a and the second diaphragm 5b, without causing the first diaphragm 5a and the second diaphragm 5b to deform too much when the pressure difference is large.

[0032] Combine Figure 2-3 As shown, the valve seat air inlet portion 7 includes an air inlet hole 7 a provided in the preset air inlet port 9 , and the cross-sectional area of the air inlet hole 7 a is smaller than the cross-sectional area of the preset air inlet port 9 .

[0033] In this embodiment, the PTFE embedded layer 5 injection-molded and filled in the first injection molding material accommodating chamber 2 and the second injection molding material accommodating chamber 3 extends into the preset air inlet 9 to form the air inlet hole 7a for air intake.

[0034] The air chamber valve seat 1 has several diaphragm connection holes 1a connecting the first injection plastic accommodating chamber 2 and the second injection plastic accommodating chamber 3, and the PTFE embedded layer 5 injection-molded and filled in the first injection plastic accommodating chamber 2 and the second injection plastic accommodating chamber 3 extends into the diaphragm connection hole 1a.

[0035] In this embodiment, the diaphragm connecting hole 1 a is used to form an effective integral connection between the first diaphragm 5 a and the second diaphragm 5 b to prevent the first diaphragm 5 a and the second diaphragm 5 b from being separated from the air chamber valve seat 1 .

[0036] The bottom of the first injection material accommodating chamber 2 is bowl-shaped, and the front of the air chamber valve seat 1 is provided with an annular injection groove 2 a connected to the first injection material accommodating chamber 2 .

[0037] In this embodiment, the bottom of the first injection molding material accommodating chamber 2 is bowl-shaped, forming a bowl-shaped diaphragm close to the air inlet connector and the air outlet connector. The annular injection groove 2a can facilitate the injection of the PTFE embedding layer 5 in the form of injection molding, and form a fixed part of the first diaphragm 5a, thereby forming effective fixation.

[0038] Combine Figure 2 、 Figure 4As shown, the second diaphragm 5b has a shaft sleeve 5b1 sleeved on the mounting column 4, and the shaft sleeve 5b1 and the second diaphragm 5b are integrally formed.

[0039] In this embodiment, the sleeve 5 b 1 can cover the mounting post 4 so that the outer ring of the mounting post 4 has the material properties of the PTFE embedding layer 5 .

[0040] The PTFE embedding layer 5 is made of polytetrafluoroethylene, and the air chamber valve seat 1 is made of aluminum.

[0041] In this embodiment, the PTFE embedded layer 5 is made of polytetrafluoroethylene (PTFE), also known as Teflon, which has good mechanical properties, can withstand harsh temperature and environmental conditions, is resistant to chemical corrosion, can withstand the nuisance of a large amount of harmful gases, has good resistance to humid environments, good anti-static properties, good resistance to surface contamination, strong alkali resistance, and good tensile strength and compression resistance. The air chamber valve seat 1 is made of aluminum material, which has good corrosion resistance and high strength.

[0042] The working principle of this utility model is:

[0043] The air chamber valve seat 1 is integrally formed of a metal material with high strength. PTFE is injected into the first injection molding plastic accommodating chamber 2 and the second injection molding plastic accommodating chamber 3 in the form of injection molding to form a PTFE embedded layer 5 that fits the air chamber valve seat 1. The valve seat exhaust portion 6 and the valve seat air inlet portion 7 are used for exhaust and air intake to control the expansion or contraction of the first diaphragm 5a and the second diaphragm 5b. The middle layer is a metal part, and the upper and lower layers are PTFE embedded layers 5 diaphragms to form a "sandwich" sandwich structure. On the one hand, the strength of the overall structure is strengthened and the service life of the vacuum pump diaphragm is increased. On the other hand, it can avoid the vacuum pump diaphragm from hitting the cylinder due to deformation, thereby reducing the failure rate.

[0044] The PTFE inlay 5 injection-molded and filled in the first injection plastic accommodating chamber 2 and the second injection plastic accommodating chamber 3 extends into the preset exhaust port 8 to form an exhaust hole 6a, which plays the role of exhaust. The exhaust hole 6a has a plurality of ribs 6a1 arranged radially at equal angles, which not only ensures sufficient gas channel area, but also effectively supports the first diaphragm 5a and the second diaphragm 5b, without causing the first diaphragm 5a and the second diaphragm 5b to deform too much when the pressure difference is large. The PTFE inlay 5 injection-molded and filled in the first injection plastic accommodating chamber 2 and the second injection plastic accommodating chamber 3 extends into the preset air inlet 9 to form an air inlet 7a, which plays the role of air intake.

[0045] The diaphragm connection hole 1a is used to form an effective integral connection between the first diaphragm 5a and the second diaphragm 5b to prevent the first diaphragm 5a and the second diaphragm 5b from being separated from the air chamber valve seat 1.

[0046] The bottom of the first injection molding chamber 2 is bowl-shaped, forming a bowl-shaped diaphragm close to the air inlet and outlet joints. The annular injection groove 2a can easily inject the PTFE insert 5 in the form of injection molding and form the fixing part of the first diaphragm 5a, forming an effective fixation.

[0047] The sleeve 5b1 can cover the mounting column 4 so that the outer ring of the mounting column 4 has the material properties of the PTFE embedding layer 5. The PTFE embedding layer 5 is made of polytetrafluoroethylene (PTFE), also known as Teflon, and has good mechanical properties. It can withstand harsh temperature and environmental conditions, is resistant to chemical corrosion, can withstand the nuisance of a large amount of harmful gases, has good resistance to humid environments, good anti-static properties, good resistance to surface contamination, strong alkali resistance, and good tensile strength and compression resistance. The air chamber valve seat 1 is made of aluminum material and has good corrosion resistance and high strength.

[0048] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the spirit of the present invention.

[0049] Although this document frequently uses terms such as chamber valve seat 1, diaphragm connecting hole 1a, first injection molding chamber 2, annular injection groove 2a, second injection molding chamber 3, mounting post 4, PTFE insert 5, first diaphragm 5a, second diaphragm 5b, sleeve 5b1, valve seat exhaust portion 6, exhaust hole 6a, rib 6a1, valve seat air inlet portion 7, air inlet hole 7a, preset exhaust port 8, and preset air inlet port 9, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention. Interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. A cavity insert structure for a diaphragm vacuum pump chamber, comprising an air chamber valve seat (1), wherein the front surface of the air chamber valve seat (1) comprises a first injection molding accommodating chamber (2), the back surface of the air chamber valve seat (1) comprises a second injection molding accommodating chamber (3) and a plurality of mounting columns (4) located in the second injection molding accommodating chamber (3), characterized in that: The air chamber valve seat (1) is made of a metal material. A PTFE embedded layer (5) is injection-molded and filled in the first injection molding plastic accommodating chamber (2) and the second injection molding plastic accommodating chamber (3). The PTFE embedded layer (5) located in the first injection molding plastic accommodating chamber (2) is called a first diaphragm (5a), and the PTFE embedded layer (5) located in the second injection molding plastic accommodating chamber (3) is called a second diaphragm (5b). A valve seat exhaust portion (6) and a valve seat air inlet portion (7) are provided between the first diaphragm (5a) and the second diaphragm (5b).

2. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 1, characterized in that: The air chamber valve seat (1) is provided with a preset exhaust port (8) and a preset air inlet (9) which are connected at one end to the first injection molding accommodating chamber (2) and at the other end to the second injection molding accommodating chamber (3); the valve seat exhaust portion (6) is located in the preset exhaust port (8), and the valve seat air inlet portion (7) is located in the preset air inlet (9).

3. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 2, characterized in that: The valve seat exhaust portion (6) comprises an exhaust hole (6a) arranged in a preset exhaust port (8), and the cross-sectional area of the exhaust hole (6a) is smaller than the cross-sectional area of the preset exhaust port (8).

4. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 3, characterized in that: The exhaust hole (6a) has a plurality of ribs (6a1) radially arranged at equal angles, and the ribs (6a1) are integrally formed with the connecting surface between the first diaphragm (5a) and the second diaphragm (5b) located in the preset exhaust port (8).

5. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 4, characterized in that: The valve seat air inlet portion (7) comprises an air inlet hole (7a) arranged in a preset air inlet port (9), and the cross-sectional area of the air inlet hole (7a) is smaller than the cross-sectional area of the preset air inlet port (9).

6. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 5, characterized in that: The air chamber valve seat (1) has a plurality of diaphragm connection holes (1a) communicating with the first injection molding accommodating chamber (2) and the second injection molding accommodating chamber (3); the PTFE embedded layer (5) injection-molded and filled in the first injection molding accommodating chamber (2) and the second injection molding accommodating chamber (3) extends into the diaphragm connection holes (1a).

7. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 6, characterized in that: The bottom of the first injection molding accommodating chamber (2) is bowl-shaped.

8. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 7, characterized in that: The front face of the air chamber valve seat (1) is provided with an annular injection groove (2a) which is in communication with the first injection molding material accommodating chamber (2).

9. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 8, characterized in that: The second diaphragm (5b) has a shaft sleeve (5b1) sleeved on the mounting column (4), and the shaft sleeve (5b1) and the second diaphragm (5b) are integrally formed.

10. The cavity insert structure for a diaphragm vacuum pump cavity according to claim 9, characterized in that: The PTFE embedded layer (5) is made of polytetrafluoroethylene, and the air chamber valve seat (1) is made of aluminum material.

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