A centralized unloading device with multiple pump heads for air compressor units

Abstract

The present invention belongs to the technical field of compressors, and relates to a centralized unloading device for multiple pump heads of an air compressor unit, which is characterized in that multiple pump heads of an air compressor unit share an unloading device, and the unloading device is arranged between the pump head and the gas tank, and includes an unloading valve and a transition chamber, and the transition chamber is connected to the gas tank of the unit, and the unloading valve controls the on-off state of the transition chamber and the outside atmosphere. Since multiple pump heads of an air compressor unit share an unloading device, the present invention can achieve the following beneficial goals: 1) The number of unloading devices is greatly reduced, so the manufacturing cost of the entire unit is reduced; 2) The number of unloading devices is greatly reduced, so the system of the entire unit is simplified, thereby improving its overall reliability; 3) The number of unloading devices is greatly reduced, so the exhaust system layout of the entire unit becomes more compact.

Description

Technical field:

[0001] The present invention belongs to the technical field of compressors, and relates to a shutdown and startup unloading device for an air compressor air supply system, specifically to a multi-pump head unloading device for an air compressor unit, and more specifically to a centralized unloading device that helps each compressor unit of the unit to complete normal startup and operation in an orderly and smooth manner. Background technology:

[0002] The air compressor system is generally composed of a compressor, a gas tank, a pipeline and various control valves, and the existing air compressor units all contain more than two compressors or pump heads. The task of the compressor is to compress the air working medium to increase its pressure, the task of the gas tank is to store the compressed high-pressure gas, and the role of the pipeline and control valve is to transport the high-pressure gas discharged from the compressor to the gas tank and prevent the gas in the tank from flowing back to the compressor. The control valve that prevents the high-pressure gas in the tank from flowing back to the compressor is called a check valve, and a pipeline is used to connect the check valve and the exhaust chamber of the compressor (commonly known as the exhaust pipe). Under normal circumstances, when the gas pressure in the tank reaches a certain preset value, the pressure valve in the control valve will feedback a signal and stop the compressor accordingly. When part of the gas in the tank is consumed, the gas pressure inside will drop accordingly. If the pressure in the tank drops to another preset value, the pressure valve will send a signal to restart the compressor to replenish new high-pressure gas to the gas tank, so the compressor is repeatedly started and stopped according to the above procedure.

[0003] The problem is that before the compressor restarts, even if the pressure in the tank has dropped to the preset lower limit of the working pressure, although the pressure valve has issued a start signal, the high pressure gas still remains in the exhaust pipe, forming a high so-called exhaust back pressure, resulting in a large starting load of the compressor, causing difficulty in starting or even failure to start. Therefore, in order to avoid the above-mentioned adverse phenomenon, existing compressors must be equipped with a so-called shutdown unloading device, that is, after the compressor output pressure reaches the standard and stops, the gas in the exhaust pipe can be quickly emptied to prepare for the next start.

[0004] However, the current air compressor units have multiple pump heads, each of which is individually equipped with a shutdown unloading device. In other words, each independent compressor unit (or pump head) is equipped with its own shutdown unloading device on the pipeline connecting the exhaust to the gas tank. Although this can achieve the unloading function of the air compressor unit, the disadvantages brought about by this are: 1) Multiple relatively independent unloading devices will inevitably lead to an increase in the manufacturing cost of the entire unit; 2) A system composed of multiple unloading devices will inevitably lead to a decrease in the overall reliability of the unit; 3) A system composed of multiple unloading devices will also make the control system of the unit complicated, and cause the exhaust system of the unit, especially the connection layout with the gas tank, to be not compact enough. Summary of the invention:

[0005] In view of the above-mentioned deficiencies in the existing exhaust unloading methods of multi-pump head air compressor units, the present invention proposes a multi-pump head centralized unloading device for an air compressor unit, the purpose of which is: while effectively achieving the exhaust unloading function of the air compressor unit, it can also achieve improved reliability of the unloading device, reduced manufacturing costs and compact layout of the unloading device.

[0006] The object of the present invention is achieved in this way: a centralized unloading device for multiple pump heads of an air compressor unit, characterized in that: the multiple pump heads included in the air compressor unit share an unloading device together, and the unloading device is arranged between the pump head of the unit and the gas tank of the unit. The unloading device includes an unloading valve and a transition chamber. One end of the unloading valve is connected to the transition chamber, and the other end of the unloading valve is connected to the external atmosphere. The unloading valve controls the on-off state of the transition chamber and the external atmosphere; in addition, the transition chamber is connected to the gas tank of the unit, and the exhaust pipes of the various pump heads of the unit are connected to the unloading device and these exhaust pipes are connected to the transition chamber of the unloading device.

[0007] There is only one unloading device mentioned above.

[0008] The above-mentioned unloading valve is of solenoid valve type.

[0009] The unloading device is provided with a check valve between its transition chamber and the gas tank, and the check valve only allows the gas in the transition chamber to flow into the gas tank in one direction but does not allow the gas in the gas tank to return to the transition chamber in reverse.

[0010] A one-way valve is arranged between the unloading device and each pump head. The one-way valve only allows the gas outputted by the pump head to flow into the transition chamber in one direction but does not allow the gas in the transition chamber to flow back to the pump head.

[0011] The one-way valve is arranged at the connection between the exhaust pipe of each pump head and the unloading device, and the one-way valve is fastened to the body of the unloading device.

[0012] The unloading operating period set for the above-mentioned unloading device is: within the period ⊿t from the moment when the last pump head among all the pump heads of the air compressor unit stops outputting gas, the unloading valve of the unloading device is in a conducting state connecting the transition chamber with the external atmosphere, and the remaining period is the period when the unloading valve of the unloading device is in a closed state that disconnects the transition chamber from the external atmosphere.

[0013] The numerical interval of the time period ⊿t of the unloading valve in the conduction state in which the transition chamber is connected to the external atmosphere is set to 0s<⊿t≤3s.

[0014] The unloading device responds to the fact that at least one pump head among all the pump heads has not been started during the unloading valve conduction period ⊿t set therein.

[0015] Compared with the prior art, the present invention has the following outstanding advantages: all pump heads of the air compressor unit share a centralized unloading device, and therefore the following beneficial goals can be achieved: 1) the number of unloading devices is greatly reduced, so the manufacturing cost of the entire unit is reduced; 2) the number of unloading devices is greatly reduced, so the system of the entire unit is simplified and its overall reliability is improved; 3) the number of unloading devices is greatly reduced, so the exhaust system layout of the entire unit becomes more compact. Description of the drawings:

[0016] Figure 1 It is a layout schematic diagram of a multi-pump head centralized unloading device for an air compressor unit of the present invention;

[0017] Figure 2 The utility model discloses an axonometric cross-sectional view of a multi-pump head centralized unloading device for an air compressor unit according to the present invention. Specific implementation method:

[0018] The present invention is further described below with reference to specific embodiments. Figure 1 and Figure 2 :

[0019] A multi-pump head centralized unloading device for an air compressor unit, wherein the air compressor unit includes at least two pump heads 1, in other words, the unit includes two pump heads, three pump heads or even more pump heads. The feature of the present invention is that the multiple pump heads 1 of the air compressor unit share a unloading device 2, and the unloading device 2 is arranged between the pump head 1 of the unit and the gas tank 3 of the unit (such as Figure 1 As shown), the unloading device 2 includes an unloading valve 4 and a transition chamber 5. One end of the unloading valve 4 is connected to the transition chamber 5, and the other end of the unloading valve 4 is connected to the external atmosphere. The unloading valve 4 controls the on-off state of the transition chamber 5 and the external atmosphere, that is, the unloading valve 4 controls whether the transition chamber 5 is formed to be connected with the external atmosphere or whether the transition chamber 5 is formed to be disconnected with the external atmosphere; in addition, the transition chamber 5 is connected to the gas tank 3 of the unit, and the exhaust pipes 6 of each pump head 1 of the unit are connected to the unloading device 2, and these exhaust pipes 6 are connected to the transition chamber 5 of the unloading device 2. In particular, the unloading device 2 of the air compressor unit of the present invention has only one, that is, the multiple pump heads of the air compressor unit adopt and only adopt one centralized unloading device 2. Further, the above-mentioned unloading valve 4 of the present invention adopts the type of solenoid valve, so that it can be more convenient to control. The unloading device 2 of the present invention is provided with a check valve 7 between its transition chamber 5 and the gas tank 3 (see Figure 1 and Figure 2 ), the check valve 7 only allows the gas in the transition chamber 5 to flow into the gas tank 3 in one direction and does not allow the gas in the gas tank 3 to return to the transition chamber 5. In order to reduce the unloading time, the present invention can be provided with a check valve 8 (such as Figure 1 and Figure 2 As shown in FIG. 1 , the one-way valve 8 only allows the gas outputted from the pump head 1 to flow into the transition chamber 5 in one direction and does not allow the gas in the transition chamber 5 to flow back to the pump head 1. Further, the one-way valve 8 in the present invention is arranged at the connection between the exhaust pipe 6 of each pump head 1 and the unloading device 2, and the one-way valve 8 is fastened to the body of the unloading device 2 (see FIG. 1 ). Figure 2 ), such a layout can make the entire device more compact.

[0020] The unloading device 2 of the present invention sets the unloading condition period as follows: from the moment when the last pump head 1 of all pump heads 1 of the air compressor unit stops outputting gas, the unloading valve 4 of the unloading device 2 is in a conducting state that connects the transition chamber 5 with the external atmosphere (this corresponds to the unloading condition of the unloading device 2 at this time). The remaining periods are the unloading valve 4 of the unloading device 2, which is in a closed state that disconnects the transition chamber 5 from the external atmosphere (this corresponds to the non-unloading condition of the unloading device 2 at this time). Further, the numerical interval of the period ⊿t in which the unloading valve 4 in the unloading device 2 of the present invention presents the conducting state that connects the transition chamber 5 with the external atmosphere is set to 0s<⊿t≤3s. Furthermore, the unloading device 2 of the present invention, in the conducting period ⊿t of the unloading valve 4 set therein, corresponds to the fact that at least one pump head 1 among all pump heads 1 has not been started. The purpose of such a layout is to allow the last started pump head 1 to also operate in an unloading environment.

[0021] Compared with the prior art, the present invention has the following outstanding advantages: all pump heads 1 of the air compressor unit share a centralized unloading device 2, and therefore the following beneficial goals can be achieved: 1) the number of unloading devices 2 is greatly reduced, so the manufacturing cost of the entire unit is reduced; 2) the number of unloading devices 2 is greatly reduced, so the system of the entire unit is simplified and its overall reliability is improved; 3) the number of unloading devices 2 is greatly reduced, so the exhaust system layout of the entire unit becomes more compact.

[0022] The above embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A centralized unloading device for multiple pump heads of an air compressor unit, characterized in that: The air compressor unit includes multiple pump heads that share a unloading device, which is arranged between the pump head of the unit and the gas tank of the unit. The unloading device includes an unloading valve and a transition chamber. One end of the unloading valve is connected to the transition chamber, and the other end of the unloading valve is connected to the external atmosphere. The unloading valve controls the on-off state of the transition chamber and the external atmosphere; in addition, the transition chamber is connected to the gas tank of the unit, and the exhaust pipes of the various pump heads of the unit are connected to the unloading device and these exhaust pipes are connected to the transition chamber of the unloading device.

2. The multi-pump head centralized unloading device for an air compressor unit according to claim 1, characterized in that: There is only one unloading device.

3. The multi-pump head centralized unloading device for an air compressor unit according to claim 2, characterized in that: The unloading valve is of electromagnetic valve type.

4. The multi-pump head centralized unloading device for an air compressor unit according to claim 3, characterized in that: The unloading device is provided with a check valve between its transition chamber and the gas tank, and the check valve only allows the gas in the transition chamber to flow into the gas tank in one direction but does not allow the gas in the gas tank to return to the transition chamber in reverse.

5. The multi-pump head centralized unloading device for an air compressor unit according to claim 4, characterized in that: A one-way valve is arranged between the unloading device and each pump head. The one-way valve only allows the gas outputted by the pump head to flow into the transition chamber in one direction but does not allow the gas in the transition chamber to flow back to the pump head.

6. The multi-pump head centralized unloading device for an air compressor unit according to claim 5, characterized in that: The one-way valve is arranged at the connection between the exhaust pipe of each pump head and the unloading device, and the one-way valve is fastened to the body of the unloading device.

7. An air compressor unit multi-pump head centralized unloading device as claimed in any one of claims 1 to 6, characterized in that: The unloading operating period set for the unloading device is: within the period ⊿t from the moment when the last pump head among all the pump heads of the air compressor unit stops outputting gas, the unloading valve of the unloading device is in a conducting state connecting the transition chamber with the external atmosphere, and the remaining period is the period when the unloading valve of the unloading device is in a closed state that disconnects the transition chamber from the external atmosphere.

8. The multi-pump head centralized unloading device for an air compressor unit according to claim 7, characterized in that: The numerical interval of the time period ⊿t during which the unloading valve is in a conducting state in which the transition chamber is connected to the external atmosphere is set to 0s<⊿t≤3s.

9. The multi-pump head centralized unloading device for an air compressor unit according to claim 8, characterized in that: The unloading device responds to the fact that at least one pump head among all the pump heads has not been started during the unloading valve conduction period ⊿t set therein.

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