CN220929823U - Air pressure stepless regulating loop and system of ballistic type shock wave massage instrument - Google Patents
Air pressure stepless regulating loop and system of ballistic type shock wave massage instrument Download PDFInfo
- Publication number
- CN220929823U CN220929823U CN202322657222.8U CN202322657222U CN220929823U CN 220929823 U CN220929823 U CN 220929823U CN 202322657222 U CN202322657222 U CN 202322657222U CN 220929823 U CN220929823 U CN 220929823U
- Authority
- CN
- China
- Prior art keywords
- air
- buffer tank
- air pressure
- shock wave
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000035939 shock Effects 0.000 title claims abstract description 34
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000001276 controlling effect Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000000926 separation method Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
Landscapes
- Percussion Or Vibration Massage (AREA)
Abstract
The utility model relates to an air pressure stepless regulating circuit and a system of a ballistic type shock wave massage device, wherein the air pressure stepless regulating circuit of the ballistic type shock wave massage device comprises an air compressor, a buffer tank, a precise proportional valve, a controller, a pressure sensor and a temperature sensor; air pumped by the air compressor is stored through the arranged cache tank, so that the problem that the utilization rate of compressed gas is low due to the fact that compressed gas is discharged without doing work is avoided, and meanwhile, the continuous operation of the air compressor is avoided. The pressure sensor is used to check the air pressure in the buffer tank. The air pressure is infinitely adjusted through the precise proportional valve, so that the problem that the working air pressure of the impact handle cannot be precisely adjusted in the prior art is solved. And controlling the start and stop of the cooling fan according to the detection result of the temperature sensor, and performing heat management on the related heat source so as to prevent the device in the shell from being over-high in temperature and affecting the normal operation of the device and prolong the service life of the device.
Description
Technical Field
The utility model relates to a shock wave therapeutic apparatus, in particular to an air pressure stepless regulating loop and a system of a ballistic shock wave massage apparatus.
Background
The ballistic type shock wave massage instrument is widely applied to the field of medical rehabilitation, and the working principle of the ballistic type shock wave massage instrument is that compressed air is utilized to drive a bullet head in an impact handle to reciprocate at a high speed, the bullet head impacts a treatment probe with specific frequency, and the treatment probe is abutted to a treatment part of a human body.
In the prior art, as shown in fig. 1, an air compressor is communicated with an impact handle through a main pneumatic circuit, compressed air generated by the air compressor is conveyed to the impact handle through the main pneumatic circuit, and the air pressure in a pipeline of the main pneumatic circuit controls the impact energy level of the impact handle. The starting circuit is provided with a plurality of exhaust valves, and the air pressure of the main pneumatic circuit is regulated by opening and closing one or more exhaust valves, specifically, when the exhaust valves are opened, part of compressed air in the main pneumatic circuit is discharged from the opened exhaust valves to reduce the air pressure in the main pneumatic circuit, the more the opened exhaust valves are, the larger the air pressure reduction amount of the main pneumatic circuit is, the less the compressed air supplied to the impact handle is, and the lower the working air pressure of the impact handle is.
However, there are at least several problems in the prior art:
(1) The working air pressure of the impact handle is controlled by opening and closing the exhaust valves with different numbers, so that a large amount of compressed air is discharged without acting, and the utilization rate of the compressed air is reduced.
(2) The working air pressure of the impact handle is adjusted in a grading manner by opening and closing the exhaust valves with different numbers, the steps of the working air pressures of adjacent levels are larger, fine adjustment cannot be realized, and the use effect and the adaptability are reduced.
In order to solve the above problems, an ideal technical solution is always sought.
Disclosure of Invention
The utility model aims at overcoming the defects of the prior art, and provides an air pressure stepless regulating circuit and an air pressure stepless regulating system of a ballistic type shock wave massage device, which can buffer compressed air and can steplessly regulate output air pressure.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
The air pressure stepless regulation loop of the ballistic type shock wave massage instrument comprises an air compressor, a buffer tank, a precise proportional valve, a controller and a pressure sensor; the buffer tank is provided with a first interface and a second interface, the first interface of the buffer tank is communicated with the air compressor through a pipeline, and the second interface of the buffer tank is communicated with the precise proportional valve through a pipeline; the controller is electrically connected with the air compressor, the pressure sensor and the like at the same time; the pressure sensor is used for detecting the pressure of the cache tank, converting the detection result into an electric signal and transmitting the electric signal to the controller, and the controller controls the start and stop of the air compressor according to the detection result of the pressure sensor; the controller is used for continuously adjusting the pressure of the working gas output by the buffer tank by controlling the precise proportional valve.
Further, a pipeline filter is arranged between the precise proportional valve and the buffer tank, and the pipeline filter is used for filtering impurities in output gas in the buffer tank.
Further, a one-way valve is arranged between the air compressor and the first interface, and the one-way valve is used for limiting compressed air in the buffer tank to act on the air compressor for a long time so as to influence the starting of the air compressor.
Further, it still includes solenoid valve and aqueous vapor separator, the solenoid valve is connected with the controller for regularly drain the temporary storage liquid of buffer tank bottom, aqueous vapor separator's outlet department is connected with the water storage cup, aqueous vapor separator can be with water drainage in the water storage cup, water storage cup bottom is provided with the drain valve, through pressing the drain valve of water storage cup bottom can the drainage.
Further, the precise proportional valve and the electromagnetic valve are linked through the controller.
Further, it further includes a primary filter provided at an air inlet of the air compressor for filtering impurities in the air.
Further, the massage device further comprises a massage device shell, a temperature sensor and a cooling fan, wherein the massage device shell is used as a foundation of other part mounting columns, the temperature sensor is connected with the controller and used for detecting the temperature in the massage device shell and converting the detection result into an electric signal to be transmitted to the controller, and the controller controls the start and stop of the cooling fan according to the detection result of the temperature sensor.
Further, the pressure relief valve is communicated with the buffer tank, and when the air pressure in the buffer tank is higher than a second preset value, the pressure relief valve is used for opening the exhaust until the air pressure in the buffer tank is equal to or lower than the second preset value.
The air pressure stepless regulating system of the ballistic type shock wave massage device comprises a shock handle and the air pressure stepless regulating loop of the ballistic type shock wave massage device, wherein an air passage interface of the shock handle is communicated with an air outlet of the precise proportional valve.
Compared with the prior art, the utility model has substantial characteristics and progress, and particularly has at least the following advantages:
1. Air is pumped into the air compressor through the buffer tank to be stored, compressed gas is released when needed, the problem that the utilization rate of the compressed gas is low because the compressed gas is discharged without doing work is avoided, and meanwhile the compressed gas can be stored through the buffer tank, so that the continuous work of the air compressor is avoided.
2. The pressure of the compressed gas discharged from the buffer tank is steplessly regulated through the precise proportional valve, so that the problem that the working pressure of the impact handle cannot be precisely regulated in the prior art is solved.
3. The water-gas separation device is used for guiding out liquid in the buffer tank, preventing the accumulation of the liquid in the buffer tank and further preventing the normal operation of the pneumatic circuit.
4. Based on the design of the technical upgrading, the operation noise of the pneumatic loop is extremely low, the use experience of a user is improved, and the pneumatic loop is convenient to play its main functions.
Drawings
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic diagram of an air pressure stepless regulation system of a ballistic shockwave massage according to an embodiment of the present utility model;
In the figure:
1. an air compressor; 2. a cache tank; 3. a precision proportional valve; 4. a pressure release valve; 5. a pipe filter; 6. a one-way valve;
72. a temperature sensor; 73. a pressure sensor;
81. A water-gas separation device; 82. an electromagnetic valve; 83. an impact handle;
92. And (5) exhausting the valve.
Detailed Description
The technical scheme of the present utility model will be described in further detail below with reference to fig. 1 to 2 and by way of specific embodiments.
A pneumatic stepless regulation loop of a ballistic type shock wave massage device comprises an air compressor 1, a buffer tank 2, a precise proportional valve 3, a controller and a pressure sensor 73.
The buffer tank 2 is provided with a first interface and a second interface, the air compressor 1 is communicated with the first interface through a pipeline, the precise proportional valve 3 is communicated with the second interface through a pipeline, the first interface is an air inlet of the buffer tank 2, and the second interface is an air outlet of the buffer tank 2; the buffer tank 2 is a device capable of storing gas, such as an air bag or an air tank. Air pumped in by the air compressor 1 is stored through the arranged cache tank 2, air power is provided for the impact handle 83 through the cache tank 2, the problem that compressed air is discharged without acting to cause low utilization rate of the compressed air is avoided, and meanwhile the compressed air can be stored through the cache tank 2, so that the air compressor 1 is prevented from continuously working.
The air compressor 1 can pump external gas into the cache tank 2 and raise the air pressure in the cache tank 2, the gas in the cache tank 2 is discharged through the precise proportional valve 3, and the precise proportional valve 3 can continuously and proportionally control the pressure of the gas medium discharged from the cache tank 2 according to the input electric signal; the air pressure of the compressed gas discharged from the buffer tank 2 is steplessly regulated through the precise proportional valve 3, so that the problem that the output air pressure cannot be precisely regulated by the exhaust valve 92 in the prior art is avoided.
The air pressure stepless regulation loop of the ballistic shock wave massage device also comprises a pressure sensor 73, wherein the pressure sensor 73 is electrically connected with the controller, and the pressure sensor 73 is used for detecting the air pressure in the buffer tank 2 and converting the detection result into an electric signal to be transmitted to the controller; when the air pressure in the buffer tank 2 is larger than a first preset value, the controller stops the operation of the air compressor 1; when the air pressure in the buffer tank 2 is smaller than a first preset value, the controller enables the air compressor 1 to start to operate.
The controller is electrically connected with the precise proportional valve 3, and the controller is used for continuously adjusting the pressure of the gas released by the buffer tank 2 by controlling the precise proportional valve 3. Specifically, the compressed gas output by the air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus according to the embodiment of the utility model can be applied to the shock handle 83 of the ballistic type shock wave massage apparatus, and provides stable and continuous air pressure capable of stepless regulation for the shock handle 83.
In some embodiments, the air pressure stepless regulation circuit of the ballistic shock wave massage apparatus further comprises a primary filter, wherein the primary filter is arranged at the air inlet of the air compressor 1 and is used for filtering impurities in air, so that the air compressor 1 is prevented from being damaged or the circuit is blocked due to excessive suction of impurities in the air by the air compressor 1.
In some embodiments, the pressure relief valve 4 is communicated with the buffer tank 2, and when the air pressure in the buffer tank 2 is higher than a second preset value, the air in the buffer tank 2 is discharged through the pressure relief valve 4, so that the air pressure in the buffer tank 2 is prevented from being overloaded. Specifically, the second preset value is a range value, the size of the second preset value depends on the cache tank 2, and the second preset value is greater than or equal to the first preset value.
In some embodiments, a pipeline filter 5 is arranged between the precise proportional valve 3 and the buffer tank 2, an air inlet of the pipeline filter 5 is connected with the second interface of the buffer tank 2, and an air outlet of the pipeline filter 5 is connected with the precise proportional valve 3. The pipe filter 5 is used to filter impurities in the gas discharged from the buffer tank 2.
Further, a one-way valve 6 is arranged between the air compressor 1 and the first interface, the one-way valve 6 is arranged on the first interface, and the one-way valve 6 is used for limiting compressed air in the buffer tank 2 to act on the air compressor 1 for a long time so as to influence the starting of the air compressor 1.
In some embodiments, the air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus further comprises a water-air separation device 81, the buffer tank 2 is further provided with a third interface, the water-air separation device 81 is communicated with the third interface of the buffer tank 2 through a pipeline, and liquid contained in air in the buffer tank 2 is discharged through the water-air separation device 81.
In detail, the third interface is positioned below the buffer tank 2 to facilitate the outflow of the liquid; the air compressor 1 compresses the external air into the buffer tank 2, the air compression condenses the water vapor in the air into liquid, and the condensed liquid is discharged through the water-air separation device 81. The water-gas separation device 81 is provided with a water outlet, the water-gas separation device 81 discharges liquid through the water outlet, and a water storage cup is arranged at the water outlet and used for storing the liquid discharged by the water outlet. The bottom of the water storage cup is provided with a drain valve, and water can be drained by pressing the drain valve at the bottom of the water storage cup.
The air pressure stepless regulating loop of the ballistic shock wave massage device further comprises a massage device shell, a temperature sensor 72 and a radiator fan, wherein the massage device shell is used as a foundation of other part mounting columns, the temperature sensor 72 is connected with the controller, the temperature sensor 72 is used for detecting the temperature in the massage device shell and converting the detection result into an electric signal to be transmitted to the controller, and the controller controls the start and stop of the radiator fan according to the detection result of the temperature sensor 72.
Further, an electromagnetic valve 82 is arranged between the inlet of the water-gas separation device 81 and the buffer tank 2; the electromagnetic valve 82 is electrically connected with a controller, and the controller can control the opening and closing of the electromagnetic valve 82; when the electromagnetic valve 82 is opened, the water-gas separation device 81 is communicated with the cache tank 2, and liquid in the cache tank 2 can enter the water-gas separation device 81; when the electromagnetic valve 82 is closed, the water-gas separation device 81 is isolated from the buffer tank 2. When the precision proportional valve 3 is closed, the solenoid valve 82 is continuously opened for a first preset time.
Specifically, the solenoid valve 82 is a two-position two-way valve; when the cache tank 2 is required to output compressed gas, the controller opens the precise proportional valve 3 to discharge the compressed gas in the cache tank 2; when the buffer tank 2 stops outputting the compressed air, the controller causes the solenoid valve 82 to be continuously opened for a first preset value time to discharge the liquid in the buffer tank 2. The length of the first preset time is set according to actual engineering requirements.
The air pressure stepless regulating circuit of the ballistic type shock wave massage device can be arranged in a closed shell, and the air compressor 1 adopts a compressor for a refrigerator so as to reduce noise during operation.
A system for continuously regulating the air pressure of a ballistic shockwave massage device, comprising a shockhandle 83 and a continuously regulating air pressure circuit of the ballistic shockwave massage device according to any one of the above. The air passage interface of the impact handle 83 is communicated with the air outlet of the precise proportional valve 3 through a pipeline, and the precise proportional valve 3 supplies compressed air to the impact handle 83 when opened.
For convenience of understanding, the following describes in detail the use of the air pressure stepless regulation system of the ballistic shockwave massage apparatus of the present utility model.
Initially, the precision proportional valve 3 is closed and the solenoid valve 82 is closed.
The air compressor 1 is started and air is pumped into the surge tank 2 through the one-way valve 6. The check valve 6 separates the air pressure of the pipeline system from the air compressor 1, so that the air compressor 1 is prevented from being started due to the pressure. The pressure sensor 73 detects the air pressure in the buffer tank 2 and converts the detection result into an electric signal to be transmitted to the controller, and when the air pressure in the buffer tank 2 is greater than a first preset value, the controller stops the operation of the air compressor 1.
The fine proportional valve 3 is opened, and the compressed gas in the surge tank 2 sequentially reaches the impact handle 83 from the pipe filter 5 and the fine proportional valve 3 to supply the compressed gas required for the operation to the impact handle 83. The pipe filter 5 suppresses the entry of impurities, uncleaned gas, and the like in the pipe into the precision proportional valve 3 or the impact handle 83, and the pipe filter 5 filters the compressed air discharged from the buffer tank 2 and supplies the filtered air to the impact handle 83.
When the air compressor 1 pumps air into the cache tank 2, water in the air can be condensed in the cache tank 2, after the impact handle 83 is used, the electromagnetic valve 82 is opened, the water-gas separation device 81 is communicated with the cache tank 2, and the water in the cache tank 2 is discharged after flowing through the electromagnetic valve 82 and the water-gas separation device 81 in sequence.
The pressure sensor 73 detects the air pressure in the buffer tank 2, and the temperature sensor 72 detects the temperature in the massage machine housing. The controller controls the start and stop of the cooling fan according to the air pressure in the buffer tank 2 and the temperature in the shell of the massage device. When the temperature in the shell of the massage device is higher than the allowable temperature of the sensor, the cooling fan is started to run.
When the pressure sensor 73 fails, the air compressor 1 continuously pumps air into the buffer tank 2, and then the air in the buffer tank 2 is larger than a second preset value, the pressure release valve 4 is opened, and compressed air in the buffer tank 2 is discharged from the pressure release valve 4.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present utility model and are not limiting; while the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present utility model or equivalents may be substituted for part of the technical features thereof; the above embodiments may be combined in any reasonable range without departing from the spirit of the technical solution of the present utility model, and all the embodiments are covered in the scope of the technical solution claimed by the present utility model.
Claims (9)
1. The utility model provides a stepless regulation return circuit of atmospheric pressure of ballistic type shock wave massage appearance which characterized in that:
the device comprises an air compressor, a buffer tank, a precise proportional valve, a controller and a pressure sensor;
The buffer tank is provided with a first interface and a second interface, the first interface of the buffer tank is communicated with the air compressor through a pipeline, and the second interface of the buffer tank is communicated with the precise proportional valve through a pipeline; the controller is electrically connected with the air compressor and the pressure sensor at the same time; the pressure sensor is used for detecting the pressure of the cache tank, converting the detection result into an electric signal and transmitting the electric signal to the controller, and the controller controls the start and stop of the air compressor according to the detection result of the pressure sensor;
the controller is used for continuously adjusting the pressure of the working gas output by the buffer tank by controlling the precise proportional valve.
2. The air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus according to claim 1, wherein:
And a pipeline filter is arranged between the precise proportional valve and the buffer tank and is used for filtering impurities in output gas in the buffer tank.
3. The air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus according to claim 2, wherein:
The air compressor and the first interface are provided with a one-way valve therebetween, and the one-way valve is used for limiting compressed air in the cache tank to act on the air compressor for a long time so as to influence the starting of the air compressor.
4. The air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus according to claim 1, wherein:
The water-gas separation device is characterized by further comprising an electromagnetic valve and a water-gas separation device, wherein the electromagnetic valve is connected with the controller and is used for regularly discharging temporary water liquid at the bottom of the buffer tank, a water storage cup is connected to a water outlet of the water-gas separation device, water can be discharged into the water storage cup by the water-gas separation device, a drain valve is arranged at the bottom of the water storage cup, and water can be discharged by pressing the drain valve at the bottom of the water storage cup.
5. The air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus according to claim 4, wherein:
The precise proportional valve is in linkage with the electromagnetic valve through the controller.
6. The air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus according to claim 1, wherein:
it also includes a primary filter provided at the air inlet of the air compressor for filtering impurities in the air.
7. The air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus according to claim 1, wherein:
The massage device comprises a controller, a temperature sensor and a heat radiation fan, wherein the temperature sensor is connected with the controller and used for detecting the temperature in the massage device and converting the detection result into an electric signal to be transmitted to the controller, and the controller controls the start and stop of the heat radiation fan according to the detection result of the temperature sensor.
8. The air pressure stepless regulation circuit of the ballistic type shock wave massage apparatus according to claim 1, wherein:
And the buffer tank is communicated with a pressure relief valve, and when the air pressure in the buffer tank is higher than a second preset value, the pressure relief valve is used for opening the exhaust until the air pressure in the buffer tank is equal to or lower than the second preset value.
9. An air pressure stepless regulating system of a ballistic type shock wave massage device is characterized in that:
Comprising an impact handle and the air pressure stepless regulating circuit of the ballistic type shock wave massage apparatus according to any one of claims 1 to 8, wherein an air passage interface of the impact handle is communicated with an air outlet of the precise proportional valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322657222.8U CN220929823U (en) | 2023-09-28 | 2023-09-28 | Air pressure stepless regulating loop and system of ballistic type shock wave massage instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322657222.8U CN220929823U (en) | 2023-09-28 | 2023-09-28 | Air pressure stepless regulating loop and system of ballistic type shock wave massage instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220929823U true CN220929823U (en) | 2024-05-10 |
Family
ID=90933533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322657222.8U Active CN220929823U (en) | 2023-09-28 | 2023-09-28 | Air pressure stepless regulating loop and system of ballistic type shock wave massage instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220929823U (en) |
-
2023
- 2023-09-28 CN CN202322657222.8U patent/CN220929823U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7922457B2 (en) | System and method for controlling a variable speed compressor during stopping | |
| US6474950B1 (en) | Oil free dry screw compressor including variable speed drive | |
| CN105997468B (en) | A kind of pulsed ESW wave device for the treatment of bone Muscular diseases | |
| EP0642629A1 (en) | Method and apparatus for regulating a compressor lubrication system. | |
| TW324777B (en) | Method for operating refrigeration apparatus during pull-down at high ambient temperature | |
| RU2006106185A (en) | GAS COMPRESSOR | |
| CN101545486A (en) | Multistage vacuum pump unit and an operation method thereof | |
| JP6058054B2 (en) | Compressor control method | |
| CN111928507B (en) | Refrigerant circulation system, control method and air conditioning unit | |
| CN220929823U (en) | Air pressure stepless regulating loop and system of ballistic type shock wave massage instrument | |
| CN208456806U (en) | A kind of pressure charging system of oil-free mute super-pressure inflator pump | |
| CN207012336U (en) | A kind of pulsed ESW wave device for the treatment of bone Muscular diseases | |
| CN111706540B (en) | Centrifugal air compressor and screw air compressor combined operation method | |
| CN212898875U (en) | Gas compression device based on liquid piston | |
| CN111902631B (en) | Gas compressor | |
| CN111720294A (en) | Gas compression device based on liquid piston | |
| JP6249671B2 (en) | Inverter-driven compressor operation control method and inverter-driven compressor | |
| CN112302901A (en) | Multi-stage compression structure, control method and multi-stage compressor | |
| CN208203561U (en) | A kind of impeller pump with safety valve | |
| CN117469137A (en) | Quick pressure regulating system and shock wave therapeutic instrument | |
| JP2688945B2 (en) | Capacity controller for oil-free screw compressor | |
| CN111207062A (en) | Efficient compressed air energy storage system and control method | |
| CN220726506U (en) | Two-stage compression drainage balance system | |
| CN220581260U (en) | Water pump with pressure regulating function | |
| JP2952377B2 (en) | Capacity control device for compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |