CN211900969U - No-load starting type refrigeration screw compressor - Google Patents
No-load starting type refrigeration screw compressor Download PDFInfo
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- CN211900969U CN211900969U CN201922344949.4U CN201922344949U CN211900969U CN 211900969 U CN211900969 U CN 211900969U CN 201922344949 U CN201922344949 U CN 201922344949U CN 211900969 U CN211900969 U CN 211900969U
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- control valve
- screw compressor
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- air inlet
- inner cavity
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Abstract
The utility model discloses an empty load starts formula refrigeration screw compressor, this empty load starts formula refrigeration screw compressor includes the casing, screw rotor and driver and control valve, form the compression chamber that carries out the compression to the refrigerant gas between casing and the screw rotor, the compression chamber is equipped with induction port and gas vent, the induction port is linked together with the air inlet of control valve, the gas vent passes through the inner chamber intercommunication of bypass pipeline with the control valve, install the solenoid valve on the bypass pipeline, the inner chamber that the high-pressure gas who follows the gas vent exhaust passes through the bypass pipeline entering control valve makes the core of control valve remove in order to close the control valve. The utility model discloses a no-load start-up formula refrigeration screw compressor makes the compressor when just starting up through setting up the control valve at casing inlet end, and the high-pressure gas of following the gas vent exhaust makes the core remove with the air inlet of closing the control valve through the bypass pipeline, and the compressor gets into idle running off-load state, realizes no-load start-up, has reduced the pick-up current, has improved equipment operational reliability.
Description
Technical Field
The utility model relates to a refrigeration screw compressor no-load starts technical field, especially relates to a no-load start-up formula refrigeration screw compressor.
Background
Screw refrigeration compressors and piston refrigeration compressors are of the positive displacement type, in which the gas is compressed by a change in volume, in the same way as gas compression.
In the related art, in order to realize the low-load safe start of the refrigeration screw compressor, a slide valve is mostly adopted for starting the existing refrigeration screw compressor to adjust the air displacement when the refrigeration screw compressor is started, so that the internal pressure ratio of the screw compressor is close to the external pressure ratio, and the low-load start of the screw compressor is realized. The sliding valve is a moving part, so that abrasion is generated during working, faults occur frequently, the working reliability is poor, and the service life is short; and the screw compressor is started by adopting a slide valve, so that the load is still about 25 percent, and the screw compressor is not economical.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem, an embodiment of the utility model expects to provide a no-load start-up formula refrigeration screw compressor with reduction pick-up current's no-load start-up.
The technical scheme of the utility model is realized like this:
a no-load starting type refrigeration screw compressor comprises a shell, a screw rotor and a driver which are arranged in the shell, and a control valve arranged at the air inlet end of the shell, wherein the screw rotor is driven by the driver to rotate, a compression chamber for compressing refrigerant gas is formed between the shell and the screw rotor, the compression chamber is provided with an air suction port and an air exhaust port, the air suction port is communicated with an air inlet of the control valve, the air exhaust port is communicated with an inner cavity of the control valve through a bypass pipeline, an electromagnetic valve is arranged on the bypass pipeline, the electromagnetic valve is opened, high-pressure gas exhausted from the air exhaust port enters the inner cavity of the control valve through the bypass pipeline to move a core body of the control valve so as to close the air inlet of the control valve.
Preferably, the control valve includes the shell and locates valve body in the shell, the air inlet is seted up in the shell, the core including insert locate in the valve body and with the valve body forms the piston seat of inner chamber, locate spring in the inner chamber and connect in the spring is kept away from the piston rod of the one end of valve body, the piston rod passes the piston seat with spring coupling is fixed, bypass pipeline with the inner chamber intercommunication.
Preferably, the valve body is fixed at the air inlet end of the shell, a ventilation channel communicated with the bypass pipeline is formed in the valve body, and the ventilation channel is communicated with the inner cavity.
Preferably, the bypass line includes a pipe and a pipe connector, one end of the pipe connector is connected to the pipe, the other end of the pipe connector is connected to the housing and inserted into the ventilation channel, one end of the pipe, which is away from the pipe connector, is connected to the exhaust port, and the electromagnetic valve is disposed in the pipe.
Preferably, the pipe connector is connected to the housing by a screw thread.
Preferably, the drive is a motor.
Preferably, the control valve is a check valve.
Preferably, the control valve is a two-position two-way check valve.
Preferably, the gas control valve further comprises a filter fixed in the housing and arranged at one end of the gas outlet of the control valve.
The embodiment of the utility model provides an empty load starting formula refrigeration screw compressor makes the compressor when just starting up through setting up the control valve at the casing inlet end, follows gas vent exhaust high-pressure gas passes through bypass pipeline gets into the inner chamber of control valve makes the core of control valve removes in order to close the air inlet of control valve prevents gaseous the follow the air inlet continues to get into, and the compressor gets into the idle running off-load state, realizes empty load starting, has effectively reduced the starting current of compressor to improve the reliability of refrigeration screw compressor operation greatly, reduced and revealed.
Drawings
Fig. 1 is a schematic structural view of a no-load start-up refrigeration screw compressor provided by the present invention;
FIG. 2 is a schematic structural view of the control valve shown in FIG. 1 in an open state;
fig. 3 is a schematic structural view of the control valve shown in fig. 1 in a closed state.
Detailed Description
In order to illustrate embodiments of the present invention or technical solutions in the prior art more clearly, the following description will be made in conjunction with the accompanying drawings in embodiments of the present invention to describe the technical solutions in the embodiments of the present invention clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Please refer to fig. 1, which is a schematic structural diagram of a no-load start-up type refrigeration screw compressor according to the present invention. The no-load starting type refrigeration screw compressor comprises a shell 1, a screw rotor 3 and a driver 5 which are arranged in the shell 1, a control valve 7 which is arranged at the air inlet end of the shell 1, and a filter 8 which is arranged at the outlet of the control valve 7, wherein the air inlet end of the shell 1 is connected with an evaporator.
The screw rotor 3 is driven by the driver 5 to rotate, specifically, in this embodiment, the driver 5 is a motor, and the motor drives the screw rotor 3 to rotate.
Referring to fig. 2 and fig. 3 in combination, fig. 2 is a schematic structural diagram of the control valve shown in fig. 1 in an open state; fig. 3 is a schematic structural view of the control valve shown in fig. 1 in a closed state. Refrigerant gas enters from the air inlet end of the shell 1, a compression chamber 11 for compressing the refrigerant gas is formed between the shell 1 and the screw rotor 3, the compression chamber 11 is provided with an air suction port 13 and an air exhaust port 15, the air suction port 13 is communicated with an air inlet 70 of the control valve 7, and the refrigerant gas entering from the air inlet end is compressed and then discharged through the air exhaust port 15. The exhaust port 15 is communicated with an inner cavity 71 of the control valve 7 through a bypass pipeline 9, an electromagnetic valve 10 is installed on the bypass pipeline 9, when the compressor is started, the electromagnetic valve 10 is opened, high-pressure gas exhausted from the exhaust port 15 enters the inner cavity 71 of the control valve 7 through the bypass pipeline 9 to move a core 77 of the control valve 7 so as to close the control valve 7, the gas is prevented from entering from the gas inlet 70 continuously, the compressor enters an idling unloading state, no-load starting is achieved, starting current of the compressor is effectively reduced, and therefore running reliability of the refrigeration screw compressor is greatly improved, and leakage is reduced.
The control valve 7 comprises a housing 73 and a valve body 75 arranged in the housing 73, the air inlet 70 is arranged in the housing 73, the core 77 comprises a piston seat 771 which is inserted in the valve body 75 and forms the inner cavity 71 with the valve body 75, a spring 773 arranged in the inner cavity 71 and a piston rod 775 which is connected with one end of the spring 773 far away from the valve body 75, the piston rod 775 penetrates through the piston seat 771 and is fixedly connected with the spring 773, the bypass pipeline 9 is communicated with the inner cavity, and the piston seat 771 closes or opens the air inlet 70 under the thrust action of the spring 773. When the high-pressure gas enters the inner cavity 71 from the bypass 9, the core 77 moves toward the gas inlet 70 to close the gas inlet 70.
The valve body 75 is fixed to the air inlet end of the housing 1, a vent channel 751 communicated with the bypass pipeline 91 is formed in the valve body 75, and the vent channel 751 is communicated with the inner cavity 71.
The bypass line 9 includes a duct 91 and a duct 91 connector 93, one end of the duct 91 connector 93 is connected to the duct 91, the other end is connected to the housing 1 by a screw and inserted into the ventilation passage 751, one end of the duct 91 remote from the duct 91 connector 93 is connected to the exhaust port 15, and the duct 91 connector 93 effectively connects the duct 91 to the housing 1.
Specifically, the control valve 7 is a check valve, and in the present embodiment, the control valve 7 is a two-position two-way check valve. The electromagnetic valve 10 is arranged in the pipeline 91, when the electromagnetic valve 10 is just started, the electromagnetic valve 10 is in an open state, the exhaust port 15 instantly generates high-pressure gas which is led to the inner cavity 71 of the control valve 7 through the bypass pipeline 91, the core body 77 moves towards the direction of the air inlet 70 due to pressure difference, the air inlet 70 is closed, and the electromagnetic valve is simple in structure and high in action stability.
The filter 8 is fixed in the casing 1 and locate the one end of the gas outlet of control valve 7 certainly the cavity 71 discharge gas of control valve 7 passes through earlier the filter 8 filters the back and arranges extremely the induction port 13 gets into compression chamber 11, like this, can effectual improvement refrigerant gas's purity, reduce the friction damage of parts such as screw rotor 3 among the refrigeration screw compressor.
The starting process of the refrigeration screw compressor is as follows:
when the compressor is started, the electromagnetic valve 10 is opened, refrigerant gas of the evaporator enters the shell 1 from the gas inlet 70 to the control valve 7, the screw rotor 3 compresses the gas to form high-pressure gas, the high-pressure gas enters the inner cavity 71 of the control valve 7 from the gas outlet 15 through the bypass pipeline 9, at the moment, the pressure of the inner cavity 71 is larger than that of the gas inlet 70, the core body 77 is driven to move towards the gas inlet 70 to close the gas inlet 70, after the compressor is completely started, the electromagnetic valve 10 is closed, the electromagnetic valve 10 is powered off, the refrigerant gas from the evaporator drives the core body 77 to move towards the gas inlet 13 under the condition that a certain pressure difference is formed between the evaporator and the gas inlet 13, at the moment, the control valve 7 is opened, and the compressor enters full-load operation.
The embodiment of the utility model provides an empty load starting formula refrigeration screw compressor makes the compressor when just starting up through setting up the control valve at the casing inlet end, follows gas vent exhaust high-pressure gas passes through bypass pipeline gets into the inner chamber of control valve makes the core of control valve removes in order to close the air inlet of control valve prevents gaseous the follow the air inlet continues to get into, and the compressor gets into the idle running off-load state, realizes empty load starting, has effectively reduced the starting current of compressor to improve the reliability of refrigeration screw compressor operation greatly, reduced and revealed.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An unloaded start type refrigeration screw compressor is characterized by comprising a shell, a screw rotor and a driver which are arranged in the shell, and a control valve arranged at the air inlet end of the shell, wherein the screw rotor is driven by the driver to rotate, a compression chamber for compressing refrigerant gas is formed between the shell and the screw rotor, the compression chamber is provided with an air suction port and an air exhaust port, the air suction port is communicated with an air inlet of the control valve, the air exhaust port is communicated with the inner cavity of the control valve through a bypass pipeline, an electromagnetic valve is arranged on the bypass pipeline, and the electromagnetic valve is opened to enable high-pressure gas exhausted from the air exhaust port to enter the inner cavity of the control valve through the bypass pipeline so as to enable a core body of the control valve to move to close the air inlet of the control valve.
2. The no-load start-up refrigeration screw compressor according to claim 1, wherein the control valve comprises a housing and a valve body disposed in the housing, the air inlet opening is disposed in the housing, the core comprises a piston seat inserted in the valve body and forming the inner cavity with the valve body, a spring disposed in the inner cavity, and a piston rod connected to an end of the spring away from the valve body, the piston rod is fixedly connected to the spring through the piston seat, and the bypass line is communicated with the inner cavity.
3. The no-load start-up refrigeration screw compressor according to claim 2, wherein the valve body is fixed to the air inlet end of the housing, and the valve body is provided with a vent passage communicating with the bypass line, and the vent passage communicates with the inner cavity.
4. The no-load start-up refrigeration screw compressor according to claim 3, wherein the bypass line comprises a pipe and a pipe connector, one end of the pipe connector is connected with the pipe, the other end of the pipe connector is connected with the shell and is inserted into the ventilation channel, one end of the pipe, which is far away from the pipe connector, is connected with the exhaust port, and the electromagnetic valve is arranged in the pipe.
5. The no-load start-up refrigeration screw compressor of claim 4, wherein the pipe connector is threadedly connected to the housing.
6. The no-load start-up refrigeration screw compressor of claim 1, wherein the driver is an electric motor.
7. The no-load start-up refrigeration screw compressor of claim 1, wherein the control valve is a check valve.
8. The no-load start-up refrigeration screw compressor of claim 7, wherein the control valve is a two-position, two-way check valve.
9. An empty-start refrigeration screw compressor according to any one of claims 1 to 8 further comprising a filter secured within the housing at one end of the gas outlet of the control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922344949.4U CN211900969U (en) | 2019-12-24 | 2019-12-24 | No-load starting type refrigeration screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922344949.4U CN211900969U (en) | 2019-12-24 | 2019-12-24 | No-load starting type refrigeration screw compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211900969U true CN211900969U (en) | 2020-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922344949.4U Expired - Fee Related CN211900969U (en) | 2019-12-24 | 2019-12-24 | No-load starting type refrigeration screw compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211900969U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982916A (en) * | 2021-09-18 | 2022-01-28 | 江森自控空调冷冻设备(无锡)有限公司 | Compressor |
-
2019
- 2019-12-24 CN CN201922344949.4U patent/CN211900969U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982916A (en) * | 2021-09-18 | 2022-01-28 | 江森自控空调冷冻设备(无锡)有限公司 | Compressor |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201110 Termination date: 20211224 |
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| CF01 | Termination of patent right due to non-payment of annual fee |