Element for compressing a gas and method for controlling such an element
By using a variable-volume internal buffer space and an overpressure valve design in the contraction section of the gas compression element, the problems of overcompression and noise vibration caused by pressure changes are solved, achieving a more efficient and stable gas compression process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ATLAS COPCO AIRPOWER NV
- Filing Date
- 2022-05-13
- Publication Date
- 2026-07-31
AI Technical Summary
Existing compressed gas components are prone to over-compression or under-compression when pressure changes, resulting in energy waste and noise vibration. Furthermore, existing overpressure valve designs are also prone to vibration and noise when pressure changes, affecting component stability.
The overpressure valve design features an internal buffer space with variable volume and a contraction section. By opening the channel when the pressure difference reaches a preset value and adjusting the gas flow direction when it is closed, the vibration and noise of the overpressure valve are reduced, and overcompression is avoided.
It effectively reduces vibration and noise in components, improves compression efficiency, reduces energy waste, and enhances component stability and durability.
Smart Images
Figure CN117337361B_ABST
Abstract
Description
[0001] The present invention relates to an element for compressing gas and a method for controlling such an element.
[0002] More specifically, the present invention relates to an element for compressing gas, the element having a housing enclosing a compression chamber, wherein the compression chamber is divided into successive chambers by a rotor, wherein the element is provided with a first passage between an outlet of the element for compressed gas and a first chamber in the compression chamber, the first chamber being in a first position not adjacent to the outlet port of the compression chamber, and wherein the first passage is provided with an overpressure valve for opening the first passage when the pressure in the first chamber in the first position exceeds a first preset value.
[0003] The element used to compress gas, in which the compression chamber is divided into successive working chambers by the rotor, is also called a rotating positive displacement element. This element generally operates based on the following principle: as the rotor rotates repeatedly, the working chambers in the compression chamber are successively divided...
[0004] - Formed at the inlet port of the compression chamber;
[0005] -Then it moves in the direction from the inlet port to the outlet port and draws in gas from the inlet port;
[0006] - As the rotor rotates further, the fluid contact with the inlet port terminates at a certain moment; and
[0007] - Finally, it begins to make contact with the outlet port and discharges the compressed gas from the compression chamber through the outlet port.
[0008] In some types of rotating positive displacement components (such as screw compressor components or screw vacuum pump components), the total volume of the working chamber decreases between the moment when fluid contact with the inlet port is terminated and the moment when the working chamber begins to make adjacent contact with the outlet port.
[0009] This reduction in volume causes an increase in the internal pressure within the compression chamber.
[0010] Therefore, the internal pressure in the compression chamber is determined by the total decrease in volume of the chamber just before it begins to come into contact with the outlet port.
[0011] In this context, the "internal pressure ratio in the compression chamber" refers to the ratio of the pressure at the outlet port of the compression chamber to the pressure at the inlet port of the compression chamber.
[0012] However, this increase in internal pressure does not always correspond to the desired pressure ratio across the element.
[0013] In this context, "pressure ratio across elements" refers to the ratio of the pressure at the outlet of an element for compressed gas to the pressure at the inlet of the element for gas.
[0014] By analyzing the pressure loss between the component inlet and the inlet port of the compression chamber, and the pressure loss between the outlet of the compression chamber and the outlet of the component, a non-correlation between the increase in internal pressure and the expected increase in pressure is revealed, as follows:
[0015] - When the internal pressure ratio in the compression chamber is higher than the expected pressure ratio across the element, the gas is over-compressed;
[0016] - When the internal pressure ratio in the compression chamber is lower than the expected pressure ratio across the element, the gas is undercompressed.
[0017] If gas can only enter or leave the compression chamber of the element through the inlet port or the outlet port, then the internal pressure ratio is fixed by the internal geometry of the rotor and the internal geometry of the compression chamber having the inlet port and the outlet port.
[0018] However, the compression ratio across components is not fixed and depends on the environmental factors of the components.
[0019] For example, in the case of a compressor component, the gas pressure at the inlet of the component is usually fixed at the ambient atmospheric pressure of the component, but the pressure of the compressed gas at the outlet can vary according to the user's requirements for the pressure of the compressed gas.
[0020] In the case of vacuum pump components, the pressure of the compressed gas at the outlet of the component is usually fixed at the ambient atmospheric pressure of the component, but the gas pressure at the inlet can be varied according to the user's requirements for the pressure in the space connected to the inlet of the vacuum pump component, which is usually below atmospheric pressure.
[0021] Therefore, depending on the environmental factors of the component, the same component may be over-compressed or under-compressed.
[0022] The environmental factors of the component can also change over time, which means that, for example, there may be over-compression at the initial moment and under-compression at a different second moment.
[0023] The downside of overcompression is that the gas is compressed too intensely, which means wasting energy to compress the gas.
[0024] In addition, regarding overcompression, the gas in the compression chamber experiences a sudden and potentially severe pressure drop at the outlet port, which can cause shock and damage to the associated components.
[0025] JP S61-65087 A, US 5,674,063 A and US2012 / 0039737 A1 describe a screw vacuum pump element having a passage with an overpressure valve between the ambient atmosphere of the element and a first chamber in the compression chamber of the screw vacuum pump element, the first chamber being in a first position not yet adjacent to the outlet port of the compression chamber.
[0026] When the gas pressure in the first chamber, which is in the first position, exceeds atmospheric pressure, the overpressure valve opens and carries the gas away from the ambient atmosphere through the channel even before the first chamber comes into contact with the outlet port, thus avoiding further overcompression in the compression chamber and the associated energy waste.
[0027] The overpressure valve used in JP S61-65087 A is a spring-loaded valve, while the overpressure valve used in US 2012 / 0039737A1 is a weight-loaded valve.
[0028] If the component operates without excessive compression in the first chamber in the first position, the spring-loaded valve in JPS61-65087 A uses a spring to keep the passage closed, which pushes the movable part of the valve against the valve seat.
[0029] The less force the spring in this type of spring-loaded valve uses to push the movable part of the valve against the valve seat, the easier and faster the spring-loaded valve opens under excessive compression. However, this has a drawback: the spring-loaded valve is more difficult and slower to return to the closed position.
[0030] When the component is operating in the first chamber in the first position without excessive compression, the weight-loaded valve in US2012 / 0039737 A1 keeps the passage closed by means of a movable part of the valve that pushes against the valve seat with its weight.
[0031] The less weight is required for the movable part of the valve to rest against the valve seat, the easier it is for a weight-loaded valve to open under excessive compression. However, this has a drawback: the weight-loaded valve is more difficult and slower to return to the closed position.
[0032] As a result of pressure changes in the ambient atmosphere of the vacuum pump components in JP S61-65087 A or US2012 / 0039737 A1, spring-loaded valves or weight-loaded valves also begin to vibrate and make noise between the closed and open positions, causing vibration and noise hazards in the components.
[0033] The present invention aims to address at least one of the aforementioned and / or other disadvantages.
[0034] Therefore, the present invention relates to an element for compressing gas.
[0035] The component includes a housing having an inlet for gas and an outlet for compressed gas.
[0036] The housing encloses a compression chamber, which is disposed within the housing. The compression chamber has an inlet port connected to the inlet and an outlet port connected to the outlet.
[0037] The compression chamber has a rotor that is rotatably mounted relative to the housing such that it divides the compression chamber into several chambers, the chambers being arranged sequentially in the direction from the inlet port to the outlet port and being mutually sealed or nearly sealed.
[0038] As the rotor rotates in the compression chamber, the working chamber is successively formed at the inlet port, then moves in the direction from the inlet port to the outlet port, decreases in volume after fluid contact with the inlet port terminates, and finally comes into adjacent contact with the outlet port.
[0039] The element is provided with a first channel configured to allow fluid connection between the outlet and a first chamber within the compression chamber, the first chamber being in a first position not yet adjacent to or in contact with the outlet port.
[0040] The first channel is equipped with a first overpressure valve, which is configured to open the first channel when the pressure difference between the pressure in the first chamber at the first position and the pressure at the outlet exceeds a first preset value, and to close the first channel when the first pressure difference is lower than the first preset value.
[0041] The first overpressure valve is characterized by comprising a valve body, the valve body enclosing an internal buffer space with a variable volume, the internal buffer space being connected to the outlet fluid via a contraction section.
[0042] It is configured such that when the first channel is opened, the variable volume decreases and gas is carried from the internal buffer space through the contraction to the outlet, and
[0043] This causes the variable volume to increase when the first channel is closed, and gas is carried from the outlet through the contraction section into the internal buffer space.
[0044] In this context, "contraction" refers to a structure having cross-sectional properties for gas flow that are smaller than the cross-sectional properties for gas flow in the internal buffer space.
[0045] Having a variable-volume internal buffer space and a contraction section between the internal buffer space and the outlet has the following advantages: the opening or further opening movement of the first overpressure valve is reduced.
[0046] Ultimately, by fluidly connecting the internal buffer space to the component's outlet via the contraction section, when the overpressure valve opens and the variable volume of the internal buffer space decreases, the pressure of the gas in the internal buffer space will temporarily increase to a level higher than the pressure of the gas in the outlet.
[0047] This temporary increase in pressure of the gas in the internal space will cause the gas in the internal buffer space to exert a counteracting force on the further opening of the overpressure valve.
[0048] The fluid connection between the internal buffer space and the component's outlet via the contraction section also makes the pressure of the gas in the internal buffer space less susceptible to pressure changes at the component's outlet.
[0049] In this way, the overpressure valve will be less likely to start vibrating and will make noise less frequently and louder, which will reduce or even eliminate the hazards of vibration and noise in the component.
[0050] In a preferred embodiment of the element according to the invention, the element is provided with at least one second channel configured to allow the outlet to be fluidly connected to the first working chamber in the first position, wherein the second channel is provided with a second overpressure valve configured to open the second channel when the first pressure difference exceeds a first preset value, and to close the second channel when the first pressure difference is lower than the first preset value.
[0051] By providing overpressure valves to both the first and second channels, the loads and vibrations associated with pressure changes in the first chamber or at the outlet of the component are distributed across the two overpressure valves, thereby reducing or even eliminating vibration and noise hazards in the component.
[0052] In a subsequent preferred embodiment of the element according to the invention, the element is provided with at least one third channel configured to enable fluid connection between the outlet and a second chamber in the compression chamber, the second chamber being in a second position not yet adjacent to the outlet port, and the second chamber being different from the first chamber, wherein the third channel is provided with a third overpressure valve configured to open the third channel when a second pressure difference between the pressure in the second chamber in the second position and the pressure at the outlet exceeds a second preset value, and to close the third channel when the second pressure difference is below the second preset value.
[0053] Because of the presence of the third channel, in addition to the first and / or second channels, overcompressed gas from the chambers that have not yet come into contact with the fluid at the outlet port can be carried from the compression chamber to the outlet.
[0054] In this way, the overcompressed gas in the compression chamber can be carried from the compression chamber to the outlet at various locations.
[0055] This is particularly advantageous when factors in the surrounding environment of the component are variable, and therefore the location where the overcompression of the gas first occurs in the compression chamber is also variable.
[0056] In a more preferred embodiment of the element according to the invention, the element is provided with at least one fourth channel configured to enable fluid connection between the outlet and the second working chamber in the second position, wherein the fourth channel is provided with a fourth overpressure valve configured to open the fourth channel when the second pressure difference exceeds a second preset value, and to close the fourth channel when the second pressure difference is lower than the second preset value.
[0057] By providing overpressure valves to both the third and fourth channels, the associated loads and vibrations caused by pressure changes in the second chamber or by pressure variations at the component's outlet are distributed across the two overpressure valves, thereby reducing or even eliminating vibration and noise hazards in the component.
[0058] Preferably, the first pressure difference and the second pressure difference are equal or nearly equal.
[0059] Thus, the same or similar valves are used for all overpressure valves in the elements according to the invention, for example, for each overpressure valve in the elements, a spring-loaded valve having the same spring and therefore the same spring strength.
[0060] This makes it easier to repair or maintain components, as only one type of valve is needed.
[0061] In another preferred embodiment of the element according to the invention, the element is a vacuum pump element.
[0062] For a vacuum pump element, the outlet has an outlet pressure equal to atmospheric pressure plus the typically limited pressure drop across the outlet system downstream of the outlet. The overpressure valve of the vacuum pump element is then also exposed to the outlet pressure.
[0063] Therefore, the same standard overpressure valve can be used in such vacuum pump components, while for compressor components, one or more overpressure valves must be specifically selected based on the user-specified and potentially variable end pressure of the compressed gas at the component's outlet.
[0064] In another preferred embodiment of the element according to the invention, the element is a screw-type element.
[0065] In screw-type components, the rotor in the compression space is a screw rotor. Typically, the compression space of a screw-type component even has two meshing screw rotors with opposite pitches.
[0066] The compression chamber in a screw-type element is subdivided into multiple chambers in the axial direction from the inlet port to the outlet port according to the pitch of the screw rotor or multiple screw rotors.
[0067] Based on this pitch, the correct position of the first channel in the axial direction can be determined so that the first channel ends at the working chamber in the compression chamber before it comes into contact with the fluid at the outlet port.
[0068] In another preferred embodiment of the element according to the invention, the element is a liquid-spraying element.
[0069] A liquid-spraying element is an element in which liquid is sprayed into the compression chamber of the element.
[0070] The sprayed liquid ensures that the gap between the sealed rotor and the wall of the compression chamber is sealed or nearly sealed to each other, without the rotor and the wall of the compression chamber coming into contact with each other, which could lead to energy loss in the components due to friction and / or damage to the rotor and / or the wall of the compression chamber.
[0071] Furthermore, the sprayed liquid can be used to cool the gas in the compression chamber, which would otherwise become hot due to the heat of compression during compression. This cooling protects the components from high temperature peaks caused by over-compression of the gas. It also allows for more energy-efficient gas compression within the compression chamber when the gas temperature increases less with the same increase in pressure.
[0072] In another preferred embodiment of the element according to the invention, the first overpressure valve is a spring-loaded valve.
[0073] In this context, "spring-loaded valve" refers to the fact that, in order to close the first overpressure valve, the first overpressure valve includes a separate spring, and / or the first overpressure valve is at least partially made of an elastic material.
[0074] When the pressure difference between the pressure in the first chamber that is in fluid contact with the first overpressure valve and the pressure at the outlet is lower than a first preset value, the spring force of the spring or elastic material closes the first overpressure valve.
[0075] In a subsequent preferred embodiment of the element according to the invention, the first channel is provided with a valve seat, wherein the first overpressure valve includes a valve base configured to be mounted in a housing, and wherein the first overpressure valve includes a portion that is movable relative to the valve base and configured to contact the valve seat and thus close the first channel.
[0076] The valve base ensures the first overpressure valve is securely mounted in the housing, while the movable portion provides flexibility to the first overpressure valve so that the first passage can be opened or closed.
[0077] In a more preferred embodiment of the element according to the invention, the valve base is configured to be removably mounted in the housing.
[0078] Therefore, the first overpressure valve in the component can be easily removed for replacement, maintenance or repair.
[0079] Furthermore, this allows the component to be modified by installing a specially modified first overpressure valve that opens the first passage when the pressure in the first chamber at the first position exceeds a particularly desired value of the first pressure difference between the pressure at the outlet and the pressure at the first position.
[0080] In a further preferred embodiment of the element according to the invention, the valve seat and / or movable portion are provided with an O-ring for sealing the first channel.
[0081] These O-rings are easy-to-manufacture and fairly reliable components that can be easily installed and replaced.
[0082] Alternatively, or additionally, the valve seat and / or movable portion may be provided with an insert of resilient material for sealing the first channel.
[0083] Compared to a standalone O-ring, this type of resilient material insert is generally more robust and less susceptible to damage (such as tearing).
[0084] Preferably, the elastic material is vulcanized rubber.
[0085] In another preferred embodiment of the element according to the invention, the contraction portion is provided in the valve base.
[0086] Therefore, the contraction section does not need to be integrated into the channel within the component's housing.
[0087] Integrating the shrinkage section into the channel within the housing of the component may require complex machining of the housing and will reduce the mechanical strength of the housing.
[0088] In a subsequent preferred embodiment of the element according to the invention, the contraction portion has a minimum diameter that is smaller than the maximum size of the internal buffer space in a direction perpendicular to the direction in which the first overpressure valve is opened or closed.
[0089] Preferably, the maximum ratio between the minimum diameter of the contraction section and the maximum size of the internal buffer space does not exceed 10%.
[0090] This maximum ratio ensures that the opening or further opening of the first overpressure valve can be reduced to a certain extent.
[0091] In a more preferred embodiment of the element according to the invention, the minimum ratio between the minimum diameter of the contraction portion and the maximum diameter of the internal buffer space is not less than 4%.
[0092] This minimum ratio ensures that the opening or further opening of the first overpressure valve can occur to some extent, although the reality is that this movement is reduced.
[0093] In addition, the present invention relates to an overpressure valve used in an embodiment of one of the above embodiments of the elements according to the present invention.
[0094] It goes without saying that this overpressure valve contributes to the advantages described above for the elements according to the invention.
[0095] In addition, the present invention relates to an apparatus for compressing gas, the apparatus being provided with elements according to one embodiment of the above-described embodiments of the elements according to the present invention.
[0096] It goes without saying that this device provides the same advantages as the above-described embodiments of the elements according to the invention.
[0097] Finally, the present invention also relates to a method for controlling an element used for compressing gas.
[0098] The component includes a housing having an inlet for gas and an outlet for compressed gas.
[0099] The housing encloses a compression chamber, which is disposed within the housing. The compression chamber has an inlet port connected to the inlet and an outlet port connected to the outlet.
[0100] In the direction from the inlet port to the outlet port, the compression chamber is divided by means of a rotor into a number of successive and mutually sealed or nearly sealed chambers.
[0101] As the rotor rotates in the compression chamber, the working chamber is successively formed at the inlet port, then moves in the direction from the inlet port to the outlet port, decreases in volume after terminating fluid contact with the inlet port, and finally comes into adjacent contact with the outlet port.
[0102] The element is provided with a first channel configured to allow fluid connection between the outlet and a first chamber within the compression chamber, the first chamber being in a first position in which it is not yet in adjacent contact with the outlet port.
[0103] The first channel opens via a first overpressure valve when the pressure difference between the pressure in the first chamber at the first position and the pressure at the outlet exceeds a first preset value, and closes when the first pressure difference falls below the first preset value.
[0104] The characteristic feature is that, when the first channel is opened, the variable volume of the internal buffer space enclosed by the valve body of the first overpressure valve decreases, and the gas carried from this internal buffer space reaches the outlet through the contraction section.
[0105] When the first channel is closed, the variable volume increases and gas is carried from the outlet through the contraction section into the internal buffer space.
[0106] It goes without saying that this method provides the same advantages as the above-described embodiments of the elements according to the invention.
[0107] To better illustrate the features of the invention, preferred embodiments of the elements according to the invention are described below by way of example without limitation, with reference to the accompanying drawings, in which:
[0108] Figure 1 A perspective view of an element according to the invention is shown;
[0109] Figure 2 It shows that according to Figure 1 The cross section of line II-II in the middle;
[0110] Figure 3 Showing more details Figure 2 The part indicated by F3.
[0111] The terminology used is intended only to describe preferred embodiments by way of example and should not be construed as a limitation on the scope of protection as defined in the claims.
[0112] Using "a" or "the" before the singular form to indicate an item does not preclude these items from being present in the plural form in this invention, unless otherwise defined.
[0113] Although the terms "first," "second," "third," or "fourth" are used below to refer to various chambers, positions, channels, overpressure valves, or preset values, these chambers, positions, channels, overpressure valves, or preset values are not limited to these terms. These terms are used at most to distinguish the type of chamber, position, channel, overpressure valve, or preset value. When terms such as "first," "second," "third," or "fourth" are used below, these terms do not imply any particular order or sequence. Therefore, a first chamber, position, channel, overpressure valve, or preset value can be readily specified as, for example, a second or third chamber, position, channel, overpressure valve, or preset value, in which case it does not exceed the scope of the exemplary embodiments. It should also be mentioned that more first, second, third, or fourth chambers, positions, channels, overpressure valves, or preset values may exist.
[0114] Figure 1 An element 1 for compressing gas is shown. The element 1 includes a housing 2 having an inlet 3 for gas and an outlet 4 for the compressed gas.
[0115] Figure 2 The basis of element 1 is shown. Figure 1 The cross section of line II-II in the middle.
[0116] The cross-section shows that the housing 2 encloses the compression chamber 5, which is provided with an inlet port 6 fluidly connected to the inlet 3 and an outlet port 7 fluidly connected to the outlet 4.
[0117] In the compression chamber 5, the rotor 8 is rotatably mounted relative to the housing 2 such that the rotor 8 divides the compression chamber 5 into several chambers arranged sequentially in the direction from the inlet port 6 to the outlet port 7 and almost mutually sealed.
[0118] In this case, rotor 8 is designed as a screw rotor. In other words, element 1 is a screw element.
[0119] In this case, but not necessarily for the present invention, the rotor 8 is rotatably mounted to the housing 2 by means of the bearing 9.
[0120] As the rotor 8 rotates in the compression chamber 5, the working chamber 8 is successively formed at the inlet port 6, and then moves in the direction from the inlet port 6 to the outlet port 7. After terminating fluid contact with the inlet port 6, the volume decreases and eventually comes into adjacent contact with the outlet port 7.
[0121] Component 1 is provided with a first channel 10, which is configured to enable the outlet 4 to be fluidly connected to a first chamber in the compression chamber 5, which is in a first position where it is not yet in adjacent contact with the outlet port 7.
[0122] The first channel 10 is provided with a first overpressure valve 11, which is configured to open the first channel 10 when the pressure difference between the pressure in the first chamber at the first position and the pressure at the outlet 4 exceeds a first preset value, and to close the first channel when the first pressure difference is lower than the first preset value.
[0123] The first overpressure valve 11 includes a valve body 12 that encloses an internal buffer space 13 with a variable volume, the internal buffer space being fluidly connected to an outlet 4 via a contraction section 14.
[0124] When the first channel 10 is opened, the variable volume of the internal buffer space 13 decreases, and the gas from the internal buffer space 13 is carried to the outlet 4 through the contraction section 14.
[0125] When the first channel 10 is closed, the variable volume of the internal buffer space 13 increases, and the gas from the outlet 4 is carried into the internal buffer space 13 through the contraction section 14.
[0126] Component 1 can be equipped with a second channel ( Figure 2 (not shown in the image), the second channel is configured to fluidly connect the outlet 4 to the first chamber when the first chamber in the compression chamber 5 is in the first position.
[0127] Similar to the first channel 10, the second channel may be equipped with a second overpressure valve. Through this second overpressure valve, the second channel opens when the first pressure difference exceeds the first preset value and closes when the first pressure difference is lower than the first preset value.
[0128] Within the framework of this invention, it is not excluded that outlet 4 can be fluidly connected to the first working chamber in the first position through more than two channels having one or more overpressure valves.
[0129] In this case, but not generally necessary for the present invention, element 1 is provided with a third channel 15, which is configured to enable outlet 4 to be fluidly connected to a second chamber in compression chamber 5, the second chamber being in a second position where it is not yet in adjacent contact with outlet port 7, and the second chamber being different from the first chamber.
[0130] The third channel 15 is provided with a third overpressure valve 16. The third channel 15 opens when the pressure difference between the pressure in the second chamber at the second position and the pressure at the outlet 4 exceeds a second preset value, and closes when the second pressure difference is lower than the second preset value.
[0131] Component 1 can be equipped with a fourth channel ( Figure 2 (Not shown in the image), the fourth channel is configured to allow outlet 4 to be fluidly connected to the second chamber located in the second position.
[0132] Similar to the first channel 15, the fourth channel may be equipped with a fourth overpressure valve. Through this fourth overpressure valve, the fourth channel opens when the second pressure difference exceeds the second preset value and closes when the second pressure difference is lower than the second preset value.
[0133] Within the framework of this invention, it is not excluded that outlet 4 can be fluidly connected to the second working chamber in the second position through more than two channels having one or more overpressure valves.
[0134] Within the framework of this invention, it is not excluded that the element includes at least one additional channel configured to enable fluid connection between outlet 4 and at least one chamber in compression chamber 5, wherein the at least one chamber is in a third position where it is not yet in adjacent contact with outlet port 7, and the at least one chamber is different from the first and second chambers.
[0135] In this case, the first overpressure valve 11 and the third overpressure valve 16 are designed as spring-loaded valves, wherein when the corresponding first pressure difference or second pressure difference between the gas pressure in the first chamber or the second chamber, which is in the first position or the second position, and the pressure at the outlet 4, is lower than the first preset value or the second preset value, the first overpressure valve 11 and the third overpressure valve 16 are closed by means of the spring force of the spring 17.
[0136] Within the framework of this invention, it is not excluded that one of the overpressure valves in one of the channels does not include a spring, but is at least partially composed of an elastic or resilient material, wherein the elastic or resilient material can deliver a spring force sufficient to close the overpressure valve when the pressure difference between the pressure in the working chamber of the compression chamber in contact with the fluid in the channel and the pressure at the outlet is less than a preset value.
[0137] Within the framework of this invention, it is not excluded that one of the overpressure valves in the components is a different type of valve, such as a weight loading valve.
[0138] In this configuration, the first channel 10 and the third channel 15 are provided with valve seats 18, wherein the first overpressure valve 11 and the third overpressure valve 16 each include a valve base 19, which is configured to be mounted in the housing 2.
[0139] The first overpressure valve 11 and the third overpressure valve 16 include movable portions 20 that are movable relative to the valve base 19, the movable portions being configured to contact the valve seat and thus close the first channel 10 or the third channel 15, respectively.
[0140] Here, the movable part 20 is provided with an O-ring 21 for sealing the first channel 10.
[0141] Within the framework of this invention, it is not excluded that the O-ring 21 is provided on the valve seat 18, or that both the movable part 20 and the valve seat 18 are provided with O-rings, or that the movable part 20 and / or the valve seat 18 are provided with a plurality of O-rings.
[0142] Within the framework of this invention, it is not excluded that, as an alternative or additional to the aforementioned O-ring, the movable portion 20 and / or the valve seat 18 may be provided with an elastic material insert for sealing the first channel 10 or the third channel 15. Preferably, the elastic material insert is made of vulcanized rubber.
[0143] In this case, the contraction section 14 is provided in the valve base 19.
[0144] In this case, the contraction section 14 is also provided as a whole in the valve base 19, rather than in the housing 2 of the element 1.
[0145] However, within the framework of this invention, it is not excluded that the contraction portion is at least partially disposed in the housing 2.
[0146] Figure 3 Show in more detail Figure 2 The first overpressure valve 11 in the section marked F3.
[0147] The invention is by no means limited to the embodiments described by way of example and shown in the accompanying drawings, but rather the elements according to the invention can be implemented in all shapes and sizes without departing from the scope of the invention as defined in the claims.
Claims
1. A component for compressing gas, The component (1) includes a housing (2) having an inlet (3) for gas and an outlet (4) for compressed gas. The housing (2) encloses the compression chamber (5), which is disposed in the housing (2) and has an inlet port (6) connected to the inlet (3) and an outlet port (7) connected to the outlet (4). The compression chamber (5) has a rotor (8) which is rotatably mounted relative to the housing (2) such that the rotor (8) divides the compression chamber (5) into a plurality of chambers, the plurality of chambers being arranged sequentially in the direction from the inlet port (6) to the outlet port (7) and being mutually sealed or nearly sealed. As the rotor (8) rotates in the compression chamber (5), the working chamber is successively formed at the inlet port (6), and then moves in the direction from the inlet port (6) to the outlet port (7), decreasing in volume after terminating fluid contact with the inlet port (6) and finally coming into adjacent contact with the outlet port (7). The element (1) is provided with a first channel (10) configured to allow the outlet (4) to be fluidly connected to a first chamber in the compression chamber (5), the first chamber being in a first position not yet adjacent to the outlet port (7). The first channel (10) is provided with a first overpressure valve (11), which is configured to open the first channel (10) when the pressure difference between the pressure in the first chamber at the first position and the pressure at the outlet (4) exceeds a first preset value, and to close the first channel when the first pressure difference is lower than the first preset value. Its features are, The first overpressure valve (11) includes a valve body (12) enclosed by an internal buffer space (13) having a variable volume, the internal buffer space being fluidly connected to the outlet (4) via a contraction section (14). It is configured such that when the first channel (10) is opened, the variable volume decreases and gas is carried from the internal buffer space (13) through the contraction section (14) to the outlet (4), and When the first channel (10) is closed, the variable volume increases and gas is carried from the outlet (4) through the contraction section (14) into the internal buffer space (13).
2. The element according to claim 1, characterized in that, The element (1) is provided with at least one second channel, the second channel being configured to allow the outlet (4) to be fluidly connected to the first working chamber in the first position. The second channel is provided with a second overpressure valve, which is configured to open the second channel when the first pressure difference exceeds the first preset value, and to close the second channel when the first pressure difference is lower than the first preset value.
3. The element according to claim 1 or 2, characterized in that, The element (1) is provided with at least one third channel (15) configured to allow the outlet (4) to be fluidly connected to a second chamber in the compression chamber (5), the second chamber being in a second position not yet adjacent to the outlet port (7), and the second chamber being different from the first chamber. The third channel (15) is provided with a third overpressure valve (16), which is configured to open the third channel (15) when the pressure in the second chamber at the second position and the pressure at the outlet (4) exceed a second preset value, and to close the third channel when the second pressure difference is lower than the second preset value.
4. The element according to claim 3, characterized in that, The element (1) is provided with at least one fourth channel, which is configured to allow the outlet (4) to be fluidly connected to the second working chamber in the second position. The fourth channel is provided with a fourth overpressure valve, which is configured to open the fourth channel when the second pressure difference exceeds the second preset value, and to close the fourth channel when the second pressure difference is lower than the second preset value.
5. The element according to claim 3, characterized in that, The first pressure difference and the second pressure difference are equal or nearly equal.
6. The element according to claim 1 or 2, characterized in that, The component (1) is a vacuum pump component.
7. The element according to claim 1 or 2, characterized in that, The element (1) is a screw-type element.
8. The element according to claim 1 or 2, characterized in that, The element (1) is a liquid-spraying element.
9. The element according to claim 1 or 2, characterized in that, The first overpressure valve (11) is a spring-loaded valve.
10. The element according to claim 1 or 2, characterized in that, The first channel (10) is provided with a valve seat (18). The first overpressure valve (11) includes a valve base (19) configured to be mounted in the housing (2), and the first overpressure valve (11) includes a movable portion (20) movable relative to the valve base (19) and configured to contact the valve seat (18) and thus close the first passage (10).
11. The element according to claim 10, characterized in that, The valve base (19) is configured to be removably mounted in the housing (2).
12. The element according to claim 10, characterized in that, The valve seat (18) and / or the movable part (20) are provided with an O-ring (21) for sealing the first channel (10).
13. The element according to claim 10, characterized in that, The valve seat (18) and / or the movable portion (20) are provided with an elastic material insert for sealing the first channel (10).
14. The element according to claim 13, characterized in that, The elastic material is vulcanized rubber.
15. The element according to claim 10, characterized in that, The contraction section (14) is disposed in the valve base (19).
16. The element according to claim 1 or 2, characterized in that, The contraction section (14) has a minimum diameter that is smaller than the maximum size of the internal buffer space (13) in a direction perpendicular to the direction in which the first overpressure valve is opened or closed.
17. The element according to claim 16, characterized in that, The maximum ratio between the minimum diameter of the contraction section (14) and the maximum size of the internal buffer space (13) shall not exceed 10%.
18. The element according to claim 16, characterized in that, The minimum ratio between the minimum diameter of the contraction section (14) and the maximum size of the internal buffer space (13) is not less than 4%.
19. An apparatus for compressing gas, the apparatus for compressing gas being provided with an element according to any one of claims 1 to 18.
20. A method for controlling an element used to compress gas, The component (1) includes a housing (2) having an inlet (3) for gas and an outlet (4) for compressed gas. The housing (2) encloses the compression chamber (5), which is disposed in the housing (2) and has an inlet port (6) connected to the inlet (3) and an outlet port (7) connected to the outlet (4). In the direction from the inlet port (6) to the outlet port (7), the compression chamber (5) is divided by means of a rotor (8) into a plurality of successive and mutually sealed or nearly sealed chambers. As the rotor (8) rotates in the compression chamber (5), the working chamber is successively formed at the inlet port (6), and then moves in the direction from the inlet port (6) to the outlet port (7), decreasing in volume after terminating fluid contact with the inlet port (6) and finally coming into adjacent contact with the outlet port (7). The element (1) is provided with a first channel (10) configured to allow the outlet (4) to be fluidly connected to a first chamber in the compression chamber (5), the first chamber being in a first position not yet adjacent to the outlet port (7). The first channel (10) opens via a first overpressure valve (11) when the pressure difference between the pressure in the first chamber at the first position and the pressure at the outlet (4) exceeds a first preset value, and closes when the first pressure difference is lower than the first preset value. Its features are, When the first channel (10) is opened, the variable volume of the internal buffer space (13) enclosed by the valve body (12) of the first overpressure valve (11) decreases, and gas is carried from the internal buffer space (13) to the outlet (4) through the contraction section (14), and When the first channel (10) is closed, the variable volume increases and gas is carried from the outlet (4) through the contraction section (14) into the internal buffer space (13).