Vacuum measuring device for vacuum pump

Abstract

The vacuum measuring device for the vacuum pump comprises a vacuum gauge and a converter cylinder, the converter cylinder is communicated with the vacuum pump, and the vacuum gauge is used for measuring the vacuum degree in the converter cylinder; wherein the converter cylinder is provided with at least one air inlet connector, the at least one air inlet connector is close to the joint of the vacuum gauge and the converter cylinder, the air inlet connector can be communicated with the external environment, and the air inlet connector is used for guiding air into the converter cylinder. According to the vacuum measuring device for the vacuum pump, the vacuum gauge and the converter cylinder are arranged, the converter cylinder is communicated with the air exhaust channel of the vacuum pump, and the vacuum gauge can be communicated with the vacuum pump through the converter cylinder, so that the pressure in the compressor tank is measured; the air inlet connector can convey external air into the converter cylinder, and when the vacuum pump exhausts air, macromolecules in the external air can take away light fractions near the vacuum gauge, so that the measurement influence of the light fractions on the vacuum gauge is reduced, the measurement error is reduced, and the measurement accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum pumps, and in particular to a vacuum measuring device for vacuum pumps. Background Art

[0002] During the current production process of refrigerators and air conditioners, the refrigerant compressor tank needs to be evacuated to a certain pressure using a vacuum pump before the refrigerant can be injected to achieve a cooling effect.

[0003] However, due to the small amount of compressor oil remaining in the refrigerant compressor tank and the copper tubes connected to it, the compressor oil will vaporize into gas during the vacuum pumping process, and the gas will be pumped into the vacuum system pipeline and the vacuum pump by the vacuum pump. Since the gaseous compressor oil contains trace components with very small molecular weight, and these gaseous molecules with very small molecular weight are difficult to be pumped away and discharged by the vacuum pump, under the effect of vacuum pressure rebound, these light distillate molecules directly lead to an increase in the molecular weight measured by the vacuum gauge, making the vacuum gauge reading too large and causing vacuum gauge reading errors, thus affecting the acceptance indicators of the compressor tank.

[0004] Therefore, there is room for further improvement in the prior art device for measuring the vacuum degree of a vacuum pump. Summary of the invention

[0005] In view of this, in order to solve the technical problem in the above-mentioned prior art that the vacuum degree measurement in the vacuum pump will be affected by the light distillation molecules generated by the compressor oil, the present application provides a vacuum measuring device for a vacuum pump, which is provided with a flow exchange cylinder, which can continuously leak a certain amount of ambient atmosphere into the exhaust pipe, so that the large molecular atmospheric components entering the pipe can take away the light distillation small molecules in the pumped container during the process of being pumped away by the vacuum pump, thereby reducing the influence of the light distillation molecules on the measurement of the vacuum gauge and improving the measurement accuracy.

[0006] The present application provides a vacuum measuring device for a vacuum pump, comprising a vacuum gauge and a commutation cylinder, wherein the commutation cylinder is connected to the vacuum pump, and the vacuum gauge is used to measure the vacuum degree in the commutation cylinder;

[0007] Among them, at least one air intake joint is provided on the commutator cylinder, wherein at least one air intake joint is close to the connection between the vacuum gauge and the commutator cylinder, the air intake joint can be connected to the external environment, and the air intake joint is used to guide air into the commutator cylinder.

[0008] Compared with the prior art, the vacuum measuring device for a vacuum pump provided in the present application is provided with a vacuum gauge and a commutation cylinder, the commutation cylinder is connected to the exhaust passage of the vacuum pump, and the vacuum gauge can be connected to the vacuum pump through the commutation cylinder, so as to measure the pressure in the compressor tank;

[0009] Among them, in the present application, an air inlet connector is provided on the exchange tube, and the air inlet connector can transport external air into the exchange tube. When the vacuum pump is pumping air, the large molecules in the external air can take away the light distillation molecules near the vacuum gauge, thereby reducing the measurement influence of the light distillation molecules on the vacuum gauge, reducing the measurement error, and improving the measurement accuracy; and, at least one air inlet connector is arranged near the connection between the vacuum gauge and the exchange tube, which can further reduce the measurement misleading of the vacuum gauge by the light distillation molecules and improve the measurement accuracy of the vacuum gauge.

[0010] Preferably, it further comprises an air outlet pipe, and the commutation cylinder is connected with the air extraction pipeline of the vacuum pump through the air outlet pipe;

[0011] An interface is provided at the end of the commutation cylinder away from the air outlet pipe, and the vacuum gauge is connected with the commutation cylinder through the interface.

[0012] Preferably, the commutation cylinder is provided with two air inlet connectors, namely a first air inlet connector and a second air inlet connector;

[0013] The first air inlet connector is arranged at the end where the interface is located, and the first air inlet connector is connected to the commutation cylinder;

[0014] The second air inlet connector is disposed at a side end of the air outlet pipe, and the second air inlet connector is communicated with the air outlet pipe.

[0015] Preferably, the air intake joint comprises a connecting pipe and an air intake pipe, the connecting pipe is in communication with the commutator cylinder, and the air intake pipe is sleeved on an end of the connecting pipe away from the commutator cylinder;

[0016] Wherein, the air intake pipe is provided with an air intake hole, and the air intake hole penetrates the air intake pipe along the axial direction of the air intake pipe.

[0017] Preferably, the air intake pipe comprises a first hole portion, a second hole portion and a third hole portion connected in sequence, the aperture of the first hole portion is R1, the aperture of the second hole portion is R2, and the aperture of the third hole portion is R3, wherein R1 <R2<R3。

[0018] Preferably, the air inlet is arranged between the first hole portion and the second hole portion, and the aperture of the air inlet is R, R <R1;

[0019] Wherein, along the axis direction of the air inlet joint, the end of the first hole portion close to the air inlet hole is provided with a first conical guide surface;

[0020] A second conical guide surface is provided at the end of the second hole portion close to the air inlet;

[0021] A third conical guide surface is provided at the end of the third hole portion close to the air inlet.

[0022] Preferably, the connecting pipe is provided with a connecting portion and a mounting portion, the mounting portion is connected to the connecting portion, the mounting portion is arranged in the third hole portion, and the connecting portion is connected to the commutation cylinder;

[0023] The outer diameter of the connecting portion is R4, the outer diameter of the mounting portion is R5, R5>R4, R5>R3;

[0024] Wherein, the end of the mounting portion is a conical structure.

[0025] Preferably, the commutation cylinder comprises a first cylinder and a second cylinder, and the first cylinder is coaxially connected with the second cylinder;

[0026] A first connecting plate is disposed outside the first cylinder, and a first connecting hole is disposed on the first connecting plate;

[0027] A second connecting plate is disposed outside the second cylinder, and a second connecting hole is disposed on the second connecting plate;

[0028] The first connecting hole and the second connecting hole are coaxially arranged to allow the same connecting piece to be inserted, so as to realize the connection between the first cylinder and the second cylinder.

[0029] Preferably, the air outlet pipe and the commutation tube are made of metal material;

[0030] The air outlet pipe and the axis of the commutator cylinder are on the same straight line, and the diameter of the air outlet pipe is smaller than the diameter of the commutator cylinder.

[0031] Preferably, a plug is further included, and the plug is used to close the connection between the air inlet connector and the external environment.

[0032] The vacuum measuring device for a vacuum pump of the present application has at least the following technical effects:

[0033] 1. By providing a commutation cylinder and an air inlet joint on the commutation cylinder, the air inlet joint is connected to the external environment, so that the commutation cylinder can be introduced with external air, so that when the vacuum pump is evacuating air, the macromolecules in the external air can take away the light distillation molecules near the vacuum gauge, thereby reducing the influence of the light distillation molecules on the measurement of the vacuum gauge, reducing the measurement error, and improving the measurement accuracy;

[0034] 2. By setting up an air outlet pipe, and the air outlet pipe and vacuum gauge are respectively set at both ends of the exchange tube, when the vacuum pump is pumping gas, the light distillate molecules near the vacuum gauge can be quickly pumped into the vacuum pump;

[0035] 3. By setting a plug, the air inlet joint can be blocked when air leakage is not required to meet the usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1It is a schematic diagram of the three-dimensional structure of a vacuum measuring device for a vacuum pump provided in one embodiment of the present application;

[0037] Figure 2 yes Figure 1 A schematic diagram of a local A enlargement;

[0038] Figure 3 It is a partial cross-sectional structural schematic diagram of a vacuum measuring device for a vacuum pump provided in one embodiment of the present application;

[0039] Figure 4 yes Figure 3 A partial enlarged schematic diagram of B;

[0040] Figure 5 It is a schematic diagram of the partial structure of a connecting pipe provided in one embodiment of the present application.

[0041] Figure 6 is a schematic diagram of a partial structure of an air intake pipe provided in an embodiment of the present application;

[0042] Reference numerals: 1. vacuum measuring device for vacuum pump; 2. vacuum pump;

[0043] 11. Inlet connector; 12. commutation tube; 13. outlet pipe; 14. first inlet connector; 15. second inlet connector; 16. interface; 17. vacuum gauge;

[0044] 111. connecting pipe; 112. air intake pipe;

[0045] 1111. mounting portion; 1112. connecting portion;

[0046] 1121, air inlet; 1122, first hole portion; 1123, second hole portion; 1124, third hole portion; 1125, first conical guide surface; 1126, second conical guide surface; 1127, third conical guide surface;

[0047] 121. First cylinder; 122. Second cylinder; 123. First connecting disk; 124. Second connecting disk. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is described in detail, clearly and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0049] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0050] Those skilled in the art should understand that, in the disclosure of the present application, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0051] The present application is further described in detail below in conjunction with the accompanying drawings. Figures 1 to 6 illustrate.

[0052] The present application provides a vacuum measuring device 1 for a vacuum pump (hereinafter referred to as the measuring device 1). The measuring device 1 is connected to the exhaust pipe of the vacuum pump 2. When the vacuum pump 2 evacuates the compressor and other equipment, the measuring device 1 can measure the vacuum degree in the compressor and other equipment, so that the staff can observe in time whether the vacuum degree of the compressor and other equipment has met the indicators.

[0053] Specifically, Figure 1 As shown, the measuring device 1 includes a vacuum gauge 17 and a commutation tube 12. The bottom of the commutation tube 12 is connected to the vacuum pump 2, and the top is connected to the vacuum gauge 17. The vacuum gauge 17 can measure the vacuum degree in the commutation tube 12 through the commutation tube 12; Figure 2 As shown, at least one air inlet connector 11 is provided on the exchange tube 12, and the air inlet connector 11 can be connected to the external environment. The air inlet connector 11 is used to guide air into the exchange tube 12, so that when the vacuum pump 2 is evacuating air, the macromolecules in the external air can take away the light distillation molecules near the vacuum gauge 17, thereby reducing the influence of the light distillation molecules on the measurement of the vacuum gauge 17, reducing the measurement error, and improving the measurement accuracy;

[0054] At least one of the air inlet connectors 11 is close to the connection between the vacuum gauge 17 and the exchange tube 12, that is, at least one of the air inlet connectors 11 is arranged on the top of the exchange tube 12, close to the vacuum gauge 17, so that after the external air enters, the probability of contact with the light distillation molecules near the vacuum gauge 17 is increased, and then when the vacuum pump 2 is pumping air, the probability of the light distillation molecules near the vacuum gauge 17 being carried away by the large molecules in the external air is increased, thereby improving the measurement accuracy of the vacuum gauge 17.

[0055] Further, such as Figures 1 to 3As shown, the measuring device 1 also includes an air outlet pipe 13, and the commutator tube 12 is a tubular structure as a whole, wherein the commutator tube 12 and the air outlet pipe 13 are coaxially arranged, and the air outlet pipe 13 is a tubular structure as a whole, and the inner diameter of the air outlet pipe 13 is smaller than the inner diameter of the commutator tube 12, and the air outlet pipe 13 is connected to the bottom of the commutator tube 12, and the vacuum gauge 17 is connected to the top of the commutator tube 12, and the commutator tube 12 is connected to the exhaust pipe of the vacuum pump 2 through the air outlet pipe 13, and the commutator tube 12 is mainly used to accommodate the gas entering from the outside, and allows the external gas to contact with the light distillation molecules near the vacuum gauge 17, thereby reducing the influence of the light distillation molecules on the measurement of the vacuum gauge 17, and reducing the acceptance index error of the compressor tank.

[0056] Among them, Figure 4 As shown, an interface 16 is provided on the exchange tube 12 for inserting a vacuum gauge 17, wherein the interface 16 protrudes outward in parallel with the axial direction, and the axis of the interface 16 is parallel to the axis of the exchange tube 12, and the outlet pipe 13 is coaxially arranged with the exchange tube 12, so that the light distillate molecules near the vacuum gauge 17 can be sucked away more smoothly.

[0057] It should be noted that, in the present application, the commutator tube 12 can be set as an integrated structure or a split structure; Figures 1 to 3 As shown, the commutator cylinder 12 is a split structure, which is divided into two parts, namely the first cylinder 121 and the second cylinder 122. The first cylinder 121 is coaxially connected with the second cylinder 122. The inner diameter of the first cylinder 121 is the same as the inner diameter of the second cylinder 122. The lower end of the first cylinder 121 is connected to the upper end of the second cylinder 122, wherein the vacuum gauge 17 is connected to the upper end of the first cylinder 121, and the air outlet cylinder is connected to the lower end of the second cylinder 122. By setting the commutator cylinder 12 as a split structure, the manufacturing difficulty of the commutator cylinder 12 can be simplified and the manufacturing cost can be reduced.

[0058] Further, such as Figure 2 , Figure 3 As shown, the first cylinder 121 is provided with a first connection disk 123 outside the end portion near the second cylinder 122, and the end surface of the first connection disk 123 is flush with the end surface of the first cylinder 121; the first connection disk 123 is an annular structure, and the first connection disk 123 and the first cylinder 121 can be an integrally formed structure; the first connection disk 123 is provided with a first connection hole, and the first connection hole penetrates the first connection disk 123 along the axial direction, and a plurality of first connection holes are provided, and the plurality of first connection holes are equidistantly distributed in the circumferential direction;

[0059] Similarly, a second connecting disk 124 is provided on the end of the second cylinder 122 close to the first cylinder 121, and the end surface of the second connecting disk 124 is flush with the end surface of the second cylinder 122; the second connecting disk 124 is an annular structure, and the second connecting disk 124 and the second cylinder 122 can be an integrally formed structure; a second connecting hole is provided on the second connecting disk 124, and the second connecting hole penetrates the second connecting disk 124 along the axial direction, and a plurality of second connecting holes are provided, and the plurality of second connecting holes are equidistantly distributed in the circumferential direction;

[0060] Among them, the first connecting hole and the second connecting hole are coaxially arranged for the insertion of the same connecting member. In this embodiment, the connecting member is preferably a screw or a bolt, which is used to lock the first connecting plate 123 and the second connecting plate 124 with a nut to achieve the connection between the first cylinder 121 and the second cylinder 122.

[0061] In addition, a sealing ring is provided between the ends of the first connecting disk 123 and the second connecting disk 124 close to the center of the axis to achieve a sealed connection between the first cylinder 121 and the second cylinder 122 .

[0062] like Figures 1 to 3 As shown, in the present application, the axes of the air outlet pipe 13 and the exchange tube 12 are in the same straight line, and the inner diameter of the exchange tube 12 is larger than the inner diameter of the air outlet pipe 13. Through such a structural arrangement, when the gas in the exchange tube 12 enters the air outlet pipe 13, the flow rate is increased, so that the large molecules in the external air in the exchange tube 12 can carry the light fraction molecules to flow into the air outlet pipe 13 more quickly.

[0063] It should be noted that, in the present application, the gas outlet pipe 13 and the exchange tube 12 are both made of metal materials; preferably, they are made of aluminum materials, which have good corrosion resistance and can prevent light distillate molecules from affecting the measuring device 1.

[0064] In the present application, the measuring device 1 also includes a plug, which can seal the air intake connector 11, and is used to close the connection between the air intake connector 11 and the external environment, so that the commutator tube 12 can meet the usage requirements in different situations. When the commutator tube 12 does not need to take in air, it can be sealed from the external environment through the plug; when it is needed, the plug is removed from the air intake connector 11 to achieve the connection between the commutator tube 12 and the external environment.

[0065] Among them, in this application, Figures 1 to 3As shown, two air inlet joints 11 are provided on the commutation tube 12, namely the first air inlet joint 14 and the second air inlet joint 15; the first air inlet joint 14 is connected with the commutation tube 12, the first air inlet joint 14 is arranged at the top of the commutation tube 12, and is located at the side end of the vacuum gauge 17, and the axis of the first air inlet joint 14 is parallel to the commutation tube 12; the second air inlet joint 15 is arranged at the side end of the outlet pipe 13, the second air inlet joint 15 is connected with the outlet pipe 13, and the axis of the second air inlet joint 15 is perpendicular to the axis of the outlet pipe 13. In the present application, the first air inlet joint 14 and the second air inlet joint 15 have the same structure, only the positions and directions are different, and different air inlet requirements can be provided to the measuring device 1; in actual use, any one or two can be opened according to the use requirements.

[0066] Among them, the axial direction of the first air inlet interface 16 is parallel to the axial direction of the interface 16, so that after the external air enters the exchange tube 12 through the first air inlet interface 16, under the suction action of the vacuum pump 2, more light distillation molecules can be taken away more quickly, thereby improving the measurement accuracy of the vacuum gauge 17.

[0067] Based on any of the above embodiments, the structure of the air intake connector 11 is further described; Figure 4 , Figure 6 As shown, the air intake connector 11 includes a connecting pipe 111 and an air intake pipe 112. Both the air intake pipe 112 and the connecting pipe 111 are tubular structures. The connecting pipe 111 is connected to the commutator tube 12. The connecting pipe 111 and the commutator tube 12 can be integrally formed or separately connected. The air intake pipe 112 is sleeved on the end of the air intake pipe 112 away from the commutator tube 12. The air intake pipe 112 and the connecting pipe 111 are interference fit, thereby ensuring the tightness of the connection between the air intake pipe 112 and the connecting pipe 111.

[0068] Among them, Figure 4 , Figure 6 As shown, the air inlet pipe 112 is provided with an air inlet hole 1121, which penetrates the air inlet pipe 112 along the axial direction of the air inlet pipe 112. The air inlet hole 1121 is set to be relatively small, thereby ensuring the extremely small air leakage performance of the air inlet joint 11 and avoiding the air inlet hole 1121 being too large to affect the suction pressure of the vacuum pump 2.

[0069] Specifically, the aperture of the air inlet hole 1121 is set between 0.01 mm and 0.02 mm. Of course, the size of the air inlet hole 1121 can be selected according to actual needs, but the overall aperture of the air inlet hole 1121 is relatively small to ensure extremely small air leakage performance.

[0070] like Figure 6As shown in the figure, the intake pipe 112 includes a first hole portion 1122, a second hole portion 1123, and a third hole portion 1124 arranged in sequence. The intake hole 1121 is provided between the first hole portion 1122 and the second hole portion 1123. The first hole portion 1122, the intake hole 1121, the second hole portion 1123, and the third hole portion 1124 are arranged in sequence along the axis direction of the intake pipe 112. The first hole portion 1122 opens on the outer end face of the intake pipe 112, and the third hole portion 1124 opens on the end face where the intake pipe 112 is connected to the connecting pipe 111. And the connecting pipe 111 is arranged in the third hole portion 1124 to realize the connection between the connecting pipe 111 and the intake pipe 112.

[0071] Wherein, the aperture of the first hole portion 1122 is R1, the aperture of the second hole portion 1123 is R2, the aperture of the third hole portion 1124 is R3, and the aperture of the intake hole 1121 is R. Among them, R < R1 < R2 < R3. So that when the external air flows from the first hole portion 1122 to the intake hole 1121, due to the decrease in the flow diameter, the flow velocity increases, so that the gas entering the first hole portion 1122 can flow into the intake hole 1121 relatively quickly. When the gas in the intake hole 1121 flows into the second hole portion 1123, the diameters of the second hole portion 1123 and the third hole portion 1124 gradually increase, and the gas will become stable, avoiding disorder, and being able to reduce the impact on the operation of the vacuum pump 2.

[0072] Furthermore, as Figure 6 shown, along the axis direction of the intake joint 11, at the end of the first hole portion 1122 close to the intake hole 1121, there is a first conical guiding surface 1125. The first conical guiding surface 1125 can slow down the flow of gas from the first hole portion 1122 to the intake hole 1121, play a role in moderating the change of gas flow velocity, reduce the adverse effect of the sudden change of aperture size on the gas, and make the gas flow more stable. Similarly, at the end of the second hole portion 1123 close to the intake hole 1121, there is a second conical guiding surface 1126, and at the end of the third hole portion 1124 close to the intake hole 1121, there is a third conical guiding surface 1127. The functions of the second conical guiding surface 1126 and the third conical guiding surface 1127 are the same as that of the first conical guiding surface 1125, both playing a buffering and connecting role, and both can make the gas flow entering the intake pipe 112 more stable, reduce the impact of the gas on the intake pipe 112 and the commutation cylinder 12, ensure the operation stability of the measuring device 1, and make the measuring environment of the vacuum gauge 17 more stable.

[0073] Furthermore, as Figure 4 、 Figure 5As shown, the connecting pipe 111 is provided with a connecting portion 1112 and a mounting portion 1111, the mounting portion 1111 is connected to the connecting portion 1112, the mounting portion 1111 is arranged in the third hole portion 1124, and the connecting portion 1112 is connected to the exchanger tube 12; wherein, the outer diameter of the connecting portion 1112 is R4, the outer diameter of the mounting portion 1111 is R5, R5>R4, R5>R3, that is, the outer diameter of the mounting portion 1111 is larger than the connecting portion 1112, so as to ensure the structural strength of the mounting portion 1111, the mounting portion 1111 is inserted into the third hole portion 1124, so as to realize the connection between the connecting pipe 111 and the air intake pipe 112, and the outer diameter of the mounting portion 1111 is larger than the aperture of the third hole portion 1124, so as to realize the interference fit between the mounting portion 1111 and the third hole portion 1124, so as to ensure the connection stability between the air intake pipe 112 and the connecting pipe 111.

[0074] Further, such as Figures 4 to 6 As shown, both ends of the mounting portion 1111 are configured as conical structures, that is, the side end faces of the mounting portion 1111 are inclined with respect to the axis, so as to reduce stress concentration on the end faces of the mounting portion 1111, improve the structural strength of the mounting portion 1111, and improve the service life of the connecting pipe 111. Figures 4 to 6 As shown, the inner diameter of the mounting portion 1111 is smaller than the inner diameter of the third hole portion 1124 , so that the gas in the intake pipe 112 can quickly enter the exchange cylinder 12 through the connecting pipe 111 .

[0075] At the same time, if Figures 4 to 6 As shown, the mounting portion 1111 faces the conical structure in the third hole portion 1124, which can guide the fluid; taking the air intake direction as the positive direction, the first conical guide surface 1125 and the conical surface of the conical structure of the mounting portion 1111 located in the third hole portion 1124 are both facing the positive direction, and the conical surfaces of the second conical guide surface 1126 and the third conical guide surface 1127 are both facing the opposite direction.

[0076] It should be noted that the various embodiments of the present application can be arbitrarily combined into a new embodiment if the solutions do not conflict and the technical solutions can coexist.

[0077] The present application is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A vacuum measuring device for a vacuum pump, characterized in that: It comprises a vacuum gauge (17) and a commutation cylinder (12), wherein the commutation cylinder (12) is connected to a vacuum pump (2), and the vacuum gauge (17) is used to measure the vacuum degree in the commutation cylinder (12); At least one air intake connector (11) is provided on the commutator cylinder (12), wherein at least one air intake connector (11) is close to the connection between the vacuum gauge (17) and the commutator cylinder (12), and the air intake connector (11) can be connected to the external environment, and the air intake connector (11) is used to guide air into the commutator cylinder (12).

2. The vacuum measuring device for a vacuum pump according to claim 1, characterized in that: It also includes an air outlet pipe (13), and the commutation cylinder (12) is connected to the air extraction pipeline of the vacuum pump (2) through the air outlet pipe (13); An interface (16) is provided at the end of the commutator cylinder (12) away from the air outlet pipe (13), and the vacuum gauge (17) is connected to the commutator cylinder (12) through the interface (16).

3. The vacuum measuring device for a vacuum pump according to claim 2, characterized in that: The commutator cylinder (12) is provided with two air inlet connectors (11), namely a first air inlet connector (14) and a second air inlet connector (15); The first air inlet connector (14) is arranged at the end where the interface (16) is located, and the first air inlet connector (14) is connected to the commutation cylinder (12); The second air inlet connector (15) is arranged at a side end of the air outlet pipe (13), and the second air inlet connector (15) is in communication with the air outlet pipe (13).

4. The vacuum measuring device for a vacuum pump according to claim 2, characterized in that: The air intake joint (11) comprises a connecting pipe (111) and an air intake pipe (112); the connecting pipe (111) is in communication with the commutator cylinder (12); and the air intake pipe (112) is sleeved on an end of the connecting pipe (111) away from the commutator cylinder (12); The air intake pipe (112) is provided with an air intake hole (1121), and the air intake hole (1121) penetrates the air intake pipe (112) along the axial direction of the air intake pipe (112).

5. The vacuum measuring device for a vacuum pump according to claim 4, characterized in that: The air intake pipe (112) comprises a first hole portion (1122), a second hole portion (1123) and a third hole portion (1124) which are connected in sequence, the first hole portion (1122) has a hole diameter of R1, the second hole portion (1123) has a hole diameter of R2, and the third hole portion (1124) has a hole diameter of R3, wherein R1 <R2<R3。 6. The vacuum measuring device for a vacuum pump according to claim 5, characterized in that: The air inlet hole (1121) is arranged between the first hole portion (1122) and the second hole portion (1123), and the aperture of the air inlet hole (1121) is R, R <R1; Wherein, along the axial direction of the air inlet joint (11), the end of the first hole portion (1122) close to the air inlet hole (1121) is provided with a first conical guide surface (1125); A second conical flow guide surface (1126) is provided at the end of the second hole portion (1123) close to the air inlet hole (1121); A third conical flow guide surface (1127) is provided at the end of the third hole portion (1124) close to the air inlet hole (1121).

7. The vacuum measuring device for a vacuum pump according to claim 5, characterized in that: The connecting pipe (111) is provided with a connecting portion (1112) and a mounting portion (1111), the mounting portion (1111) is connected to the connecting portion (1112), the mounting portion (1111) is arranged in the third hole portion (1124), and the connecting portion (1112) is connected to the commutator cylinder (12); The outer diameter of the connecting portion (1112) is R4, the outer diameter of the mounting portion (1111) is R5, R5>R4, R5>R3; Wherein, the end of the mounting portion (1111) is a conical structure.

8. The vacuum measuring device for a vacuum pump according to claim 2, characterized in that: The commutator cylinder (12) comprises a first cylinder body (121) and a second cylinder body (122), wherein the first cylinder body (121) and the second cylinder body (122) are coaxially connected; A first connection disk (123) is disposed outside the first cylinder (121), and a first connection hole is disposed on the first connection disk (123); A second connection plate (124) is disposed outside the second cylinder (122), and a second connection hole is disposed on the second connection plate (124); The first connecting hole and the second connecting hole are coaxially arranged to allow the same connecting piece to be inserted, so as to realize the connection between the first cylinder (121) and the second cylinder (122).

9. The vacuum measuring device for a vacuum pump according to claim 2, characterized in that: The air outlet pipe (13) and the commutation tube (12) are made of metal material; The axis of the air outlet pipe (13) and the commutator cylinder (12) are on the same straight line, and the diameter of the air outlet pipe (13) is smaller than the diameter of the commutator cylinder (12).

10. The vacuum measuring device for a vacuum pump according to claim 1, characterized in that: It also comprises a plug, which is used to close the connection between the air inlet connector (11) and the external environment.

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