CN114811137A - Pressure control valve for controlling opening degree of valve core by using sensitive element and refrigeration system - Google Patents
Pressure control valve for controlling opening degree of valve core by using sensitive element and refrigeration system Download PDFInfo
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- CN114811137A CN114811137A CN202210226799.0A CN202210226799A CN114811137A CN 114811137 A CN114811137 A CN 114811137A CN 202210226799 A CN202210226799 A CN 202210226799A CN 114811137 A CN114811137 A CN 114811137A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 27
- 230000005540 biological transmission Effects 0.000 claims abstract description 57
- 230000007246 mechanism Effects 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- 230000008859 change Effects 0.000 claims abstract description 21
- 230000005489 elastic deformation Effects 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/34—Excess-flow valves in which the flow-energy of the flowing medium actuates the closing mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a pressure control valve for controlling the opening degree of a valve core by using a sensitive element, which comprises: the valve body is provided with an inlet and an outlet, valve holes are arranged on a communication pipeline of the inlet and the outlet, the outer end of each valve hole is provided with a valve port, and a steel ball is placed at each valve port; the bourdon tube comprises a fixed end and a free end, and the fixed end is communicated with the inlet; the free end of the Bourdon tube is fixedly connected with the push block, a first slide bar and a second slide bar are connected to two sides of the push block respectively, and a gear transmission mechanism used for converting elastic deformation of the Bourdon tube into rotation angle change is hinged to the other side of the first slide bar. The invention can shorten the conduction time and improve the braking efficiency on one hand, and has a constraint effect on the deformation direction of the free end of the Bourdon tube on the other hand, so that the pressure variation of the refrigeration working medium can be better and faster transmitted to the first transmission rod, the opening degree of the valve core can be better controlled, and the change of the front pressure value and the rear pressure value can be visualized.
Description
Technical Field
The invention relates to the field of pressure control valves and refrigeration systems, in particular to a pressure control valve and a refrigeration system, wherein the opening degree of a valve core is controlled by using a sensitive element.
Background
With the development of technology, devices using high-pressure working media are more and more widely used, such as: in a refrigeration system, carbon dioxide which is widely considered as a refrigeration working medium with development prospect is used as a natural refrigeration working medium, so that the environment protection is facilitated, and meanwhile, the performance of the transcritical carbon dioxide refrigeration cycle is equivalent to that of the traditional freon refrigeration working medium circulation system. In a transcritical carbon dioxide refrigeration system, the high side pressure must be regulated, and therefore a corresponding pressure control device is required. In order to meet the requirement of modern technology on pressure control, in particular to the requirement of pressure regulation of a transcritical carbon dioxide refrigeration system, various pressure control valves are disclosed in the prior art, for example, a pressure control valve and a refrigeration system which utilize a sensitive element to control the opening degree of a valve core, the pressure control valve accurately transmits the inlet pressure to a threaded transmission connection through a gear transmission assembly according to a certain transmission proportion in a form of a rotating angle, the rotating angle is converted into axial displacement through the threaded transmission, the position of the valve core is controlled through the axial displacement, the control on the opening degree of a valve port is realized, high control precision can be easily ensured through selecting a proper gear transmission and threaded transmission relationship, and the stability of a control process is ensured. However, there are some disadvantages as follows: (1) because the Bourdon tube adopted by the scheme is of a structure similar to a C shape, when the pressure of a refrigeration working medium is changed, the free end of the Bourdon tube is deformed by utilizing the characteristic of the Bourdon tube, the deformation of the Bourdon tube is converted into axial displacement, and the position of the valve core is controlled by the axial displacement, so that the control on the opening degree of the valve port is realized, the method has long transmission process and low efficiency, and the display of the opening degree of the valve port is not visual; (2) when the pressure of the inlet refrigeration working medium is increased, the pressure of the inner cavity of the Bourdon tube is increased, the elastic deformation amount is increased, and when the pressure of the refrigeration working medium is changed excessively and frequently, the steel ball of the Bourdon tube is driven by the transmission rod and the spring to frequently contact the valve port, so that the valve port structure can be damaged if the time is long.
Disclosure of Invention
The invention aims to provide a pressure control valve and a refrigeration system which can reduce the conduction time, have high efficiency, visually display the opening degree of a valve port and protect the valve port structure of a valve body, and control the opening degree of a valve core by using a sensitive element, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a pressure control valve for controlling a valve element opening degree using a sensing element, comprising:
the valve body is provided with an inlet and an outlet, a valve hole is arranged on a communication pipeline of the inlet and the outlet, a valve port is arranged at the outer end of the valve hole, and a steel ball is placed at the valve port;
the bourdon tube comprises a fixed end and a free end, and the fixed end is communicated with the inlet;
the free end of the Bourdon tube is fixedly connected with the push block, a first slide bar and a second slide bar are connected to two sides of the push block respectively, the other side of the first slide bar is hinged with a gear transmission mechanism used for converting elastic deformation of the Bourdon tube into change of a rotation angle, and the other side of the second slide bar is connected with a sliding mechanism used for converting change of pressure of the inlet refrigeration working medium into change of sectional area of a throttling channel so as to control opening of the valve core.
Preferably, gear drive includes the driving gear, and driving gear engaged with driven gear, driven gear's central fixedly connected with pivot, slide mechanism includes the guide way, the guide way with one side sliding connection of second slide bar, the opposite side elastic connection of second slide bar has first spring, first spring set up in the guide way bottom.
Preferably, a first transmission rod is nested in the rotating shaft, the upper end of the first transmission rod is fixedly connected with a gauge shaft of the pressure gauge, a pointer is installed on the gauge shaft, and the lower end of the first transmission rod extends to an outer end valve port of a valve hole communicated with the inlet and the outlet.
Preferably, still including the symmetry setting be in the buffer gear of tip both sides under the first drive rod, buffer gear includes the backup pad, and backup pad fixed connection's first connecting rod to and the guide bar, the other end of first connecting rod articulates there is the second connecting rod, cup joint two corresponding support sleeve on the guide bar, support sleeve with the other end fixed connection of second connecting rod, be provided with reset spring between two support sleeve.
Preferably, still including supporting the supporting mechanism of steel ball, supporting mechanism includes support column, second spring and cavity screw, the welding of support column upper end has the steel ball, and lower extreme fixed connection is on the second spring, the other end of second spring sets up in the cavity screw, the cavity screw passes through the threaded fixation on the valve body.
Preferably, the two sides of the supporting column are symmetrically provided with wheel-moving mechanisms, and each wheel-moving mechanism comprises a second transmission rod hinged on the supporting column and a wheel disc movably connected with the other side of the second transmission rod.
Preferably, the first sliding rod and the second sliding rod are respectively embedded in the first sliding groove and the second sliding groove and slide in the first sliding groove and the second sliding groove.
Preferably, the driving gear is a sector gear.
Preferably, the shaft is coaxial with the first driving lever and the watch shaft.
In order to achieve the above purpose, the invention also provides the following technical scheme:
a refrigerating system comprises a compressor, a gas cooler, an internal heat exchanger, an evaporator, a gas-liquid separator and a pressure control valve, wherein the opening degree of a valve core of the pressure control valve is controlled by a sensitive element, the inlet of the gas cooler is communicated with the outlet of the compressor, the outlet of the gas cooler is communicated with the high-pressure side inlet of the internal heat exchanger, the inlet of the pressure control valve is communicated with the high-pressure side outlet of the internal heat exchanger, the outlet of the pressure control valve is communicated with the inlet of the evaporator, the inlet of the gas-liquid separator is communicated with the outlet of the evaporator, the outlet of the gas-liquid separator is communicated with the low-pressure side inlet of the internal heat exchanger, and the low-pressure side outlet of the internal heat exchanger is communicated with the inlet of the compressor.
Compared with the prior art, the invention has the beneficial effects that:
the free end of the Bourdon tube is connected through the push block, the push block is pushed to drive the first slide rod and the second slide rod to slide in the first slide groove and the second slide groove respectively after the free end is deformed due to pressure, the variation of the pressure of the refrigerating working medium is transmitted through the action of the gear transmission mechanism, the push block is directly connected to the free end of the Bourdon tube, on one hand, the conduction time can be shortened, the braking efficiency is improved, on the other hand, the deformation direction of the free end of the Bourdon tube is restrained through the first slide groove and the second slide groove, the variation of the pressure of the refrigerating working medium can be transmitted to the first transmission rod better and faster, the first transmission rod is enabled to move up and down, the opening degree of the valve core is controlled better, through connecting the pressure gauge to the upper end of the first transmission rod, when the pressure of the refrigerating working medium is changed, the difference between the internal pressure and the external pressure of the Bourdon tube is changed, and the elastic deformation of the Bourdon tube is changed due to the change of the pressure difference, the first transmission rod is driven to generate axial displacement to control the position of the steel ball relative to the valve port, and the pressure gauge can visually change the front and back pressure values.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic view of a buffer mechanism according to the present invention;
FIG. 4 is a schematic structural view of the sliding mechanism of the present invention;
FIG. 5 is a schematic structural view of a support mechanism and a wheel-moving mechanism according to the present invention;
fig. 6 is a schematic diagram of the refrigeration system of the present invention.
In the figure: 1 valve body, 2 valve core, 101 inlet, 102 outlet, 3 valve hole, 301 valve port, 4 Bourdon tube, 401 fixed end, 402 free end, 5 pushing block, 6 first slide bar, 7 second slide bar, 8 gear transmission mechanism, 801 driving gear, 802 driven gear, 803 rotating shaft, 9 sliding mechanism, 901 guide groove, 902 first spring, 10 first transmission bar, 11 pressure gauge, 111 gauge shaft, 112 pointer, 12 buffer mechanism, 121 supporting plate, 122 first connecting bar, 123 guide bar, 124 second connecting bar, 125 supporting sleeve, 126 reset spring, 13 steel ball, 14 supporting mechanism, 141 supporting column, 142 second spring, 143 hollow screw, 15 wheel transmission mechanism, 151 second transmission bar, 152 wheel disc, 16 compressor, 17 gas cooler, 18 internal heat exchanger, 19 evaporator, 20 gas-liquid separator, 21 pressure control valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to fig. 1 to 6, the present invention provides a technical solution:
a pressure control valve for controlling the opening degree of a spool using a sensing element, as shown in fig. 1, comprising: the valve comprises a valve body 1 and a valve core 2, wherein the valve body 1 is provided with an inlet 101 and an outlet 102, a communicating pipeline of the inlet 101 and the outlet 102 is provided with a valve hole 3, the outer end of the valve hole 3 is provided with a valve port 301, and a steel ball 13 is placed at the valve port 301; as shown in fig. 2, the method further includes: the bourdon tube 4 comprises a fixed end 401 and a free end 402, the free end 402 is a part which is expanded due to elastic deformation when subjected to high temperature or high pressure or contracted due to elastic deformation from high temperature or high pressure to low temperature or low pressure, the fixed end 401 is communicated with the inlet 101, the free end 402 of the bourdon tube 4 is fixedly connected with the push block 5, two sides of the push block 5 are respectively connected with a first slide bar 6 and a second slide bar 7, the first slide bar 6 and the second slide bar 7 are respectively embedded in the first slide groove 601 and the second slide groove 701 and slide in the first slide groove 601 and the second slide groove 701, the other side of the first slide bar 6 is hinged with a gear transmission mechanism 8 which is used for converting the elastic deformation of the bourdon tube 4 into rotation angle change, the other side of the second slide bar 7 is connected with a slide mechanism 9 which is used for converting the change of the pressure of the refrigerating working medium at the inlet 101 into the change of the sectional area of a throttling channel, in order to control the opening of the valve element, the gear transmission mechanism 8 includes a driving gear 801 and a driven gear 802 engaged with the driving gear 801, the driving gear 801 is a sector gear, a rotating shaft 803 is fixedly connected to the center of the driven gear 802, as shown in fig. 4, the sliding mechanism 9 includes a guide groove 901, the guide groove 901 is slidably connected to one side of the second slide bar 7, the other side of the second slide bar 7 is elastically connected to a first spring 902, and the first spring 902 is disposed at the bottom of the guide groove 901.
As shown in fig. 1, a first transmission rod 10 is nested in the rotation shaft 803, the upper end of the first transmission rod 10 is fixedly connected with a gauge shaft 111 of a pressure gauge 11, a pressure value is carved on an inner dial of the pressure gauge 11, as shown in fig. 2, a pointer 112 is installed on the gauge shaft 111, as shown in fig. 4, the lower end of the first transmission rod 10 extends to an outer end valve port 301 of a valve hole 3 communicating an inlet 101 and an outlet 102, as shown in fig. 1, and the rotation shaft 803 is coaxial with the first transmission rod 10 and the gauge shaft 111.
As shown in fig. 3, the pressure control valve further includes a buffer mechanism 12 symmetrically disposed at two sides of the lower end of the first transmission rod 10, the buffer mechanism 12 includes a support plate 121, a first connecting rod 122 fixedly connected to the support plate 121, and a guide rod 123, the other end of the first connecting rod 122 is hinged to a second connecting rod 124, two corresponding support sleeves 125 are sleeved on the guide rod 123, the support sleeves 125 are fixedly connected to the other end of the second connecting rod 124, and a return spring 126 is disposed between the two support sleeves 125.
As shown in fig. 5, the pressure control valve further includes a supporting mechanism 14 for supporting the steel ball 13, the supporting mechanism 14 includes a supporting column 141, a second spring 142 and a hollow screw 143, the steel ball 13 is welded at the upper end of the supporting column 141, the lower end of the supporting column 141 is fixedly connected to the second spring 142, the other end of the second spring 142 is disposed in the hollow screw 143, the hollow screw 143 is fixed to the valve body 1 through a thread, the two sides of the supporting column 141 are symmetrically provided with the wheel-moving mechanisms 15, and each wheel-moving mechanism 15 includes a second transmission rod 151 hinged to the supporting column 141 and a wheel disc 152 movably connected to the other side of the second transmission rod 151.
In the invention, in order to intuitively know the relation between the pressure change of the working medium and the opening degree of the valve core, the pressure gauge 11 is connected at the upper end of the first transmission rod 10, when the pressure of the refrigeration working medium is changed, the difference between the internal pressure and the external pressure of the Bourdon tube 4 is changed, the elastic deformation change of the Bourdon tube 4 is generated by the change of the pressure difference, the first transmission rod 10 is driven to generate axial displacement, so that the position of the steel ball 13 relative to the valve port 301 is controlled, and the front and back pressure values on the pressure gauge 11 can be intuitively changed.
According to the invention, the push block 5 is connected with the free end 402 of the Bourdon tube 4, the push block 5 is pushed to drive the first slide rod 6 and the second slide rod 7 to respectively slide in the first slide groove 601 and the second slide groove 701 after the free end 402 is deformed due to compression, the pressure variation of the refrigerant is transmitted through the action of the gear transmission mechanism 8, and the push block 5 is directly connected with the free end 402 of the Bourdon tube 4, so that on one hand, the conduction time can be shortened, the braking efficiency is improved, on the other hand, the deformation direction of the free end 402 of the Bourdon tube 4 is restrained through the first slide groove 601 and the second slide groove 701, the pressure variation of the refrigerant can be transmitted to the first transmission rod 10 better and faster, the first transmission rod 10 can move up and down, and the change of the opening of the valve core can be better controlled.
In the present invention, due to the upward restraining force of the second spring 142 below the supporting column 141 welded with the steel ball 13, the steel ball 13 is always kept in contact with the end of the transmission rod 10, and the second spring 142 acts: firstly, supporting the steel ball 13, and secondly, eliminating the transmission clearance; the hollow screw 143 is used for adjusting and setting the compression amount of the second spring 142, finally adjusting the force required for driving the valve plug, and adjusting the sensitivity of the pressure control valve, and the buffering mechanism 12 can prevent the steel ball 13 from frequently contacting the valve port driven by the transmission rod 10 and the second spring 142 when the pressure of the refrigerant changes too much and frequently, and the valve port structure can be damaged if the time is long.
In the invention, the second transmission rod 151 and the wheel disc 152 of the wheel-moving mechanism 15 can be used for supporting the supporting column 141 in the process of moving the supporting column 141 up and down, so as to ensure that the steel ball 13 can vertically move up and down.
A refrigeration system, as shown in FIG. 6, comprising a compressor 16, a gas cooler 17, an internal heat exchanger 18, an evaporator 19, a gas-liquid separator 20 and a pressure control valve using a sensing element to control the opening degree of a valve core, as described in any one of the above, comprising the compressor 16, the gas cooler 17, the internal heat exchanger 18, the evaporator 19, the gas-liquid separator 20 and a pressure control valve using a sensing element to control the opening degree of a valve core, as described in any one of the above, wherein an inlet of the gas cooler 17 is communicated with an outlet of the compressor 16, an outlet is communicated with a high pressure side inlet of the internal heat exchanger 18, an inlet 101 of the pressure control valve 21 is communicated with a high pressure side outlet of the internal heat exchanger 18, an outlet 102 is communicated with an inlet of the evaporator 19, an inlet of the gas-liquid separator 20 is communicated with an outlet of the evaporator 19, the outlet communicates with the low-side inlet of the internal heat exchanger 18, and the low-side outlet of the internal heat exchanger 18 communicates with the inlet of the compressor 16. In the present invention, the compressor 16, the gas cooler 17, the internal heat exchanger 18, the evaporator 19, the gas-liquid separator 20, and the like may be implemented by hardware in the related art, and will not be described herein.
The detailed structure of the pressure control valve for controlling the opening degree of the valve core by using the sensing element can refer to the embodiment and is not described again; it can be understood that, because the pressure control valve which controls the opening degree of the valve element by using the sensing element is used in the refrigeration system of the present invention, the embodiment of the refrigeration system of the present invention includes all technical solutions of all embodiments of the pressure control valve which controls the opening degree of the valve element by using the sensing element, and the achieved technical effects are also completely the same, and are not described herein again.
The working principle of the pressure control valve and the refrigerating system which utilize the sensitive element to control the opening degree of the valve core is as follows:
when the pressure of the refrigerating working medium at the inlet 101 is increased, the pressure of the inner cavity of the Bourdon tube 4 is increased, and the elastic deformation amount is increased; when the pressure of the refrigeration working medium at the inlet 101 is reduced, the elastic deformation amount of the Bourdon tube 4 is reduced, the free end 402 of the Bourdon tube 4 displaces along with the change of the elastic deformation amount, the push block 5 and the first slide bar 6 drive the driving gear 801 to rotate, the driving gear 801 drives the driven gear 802 and the rotating shaft 803 to rotate through gear meshing, the rotating shaft 803 rotates and simultaneously has the change of axial displacement, the first transmission rod 10 is nested in the rotating shaft 803 and is rigidly connected with the rotating shaft 803, so the transmission rod 10 moves up and down along with the rotating shaft 803, the pressure gauge 11 is connected with the upper end of the first transmission rod 10, the change of front and back pressure values can be directly observed through the pressure gauge 11, the steel ball 13 is always kept in contact with the end of the transmission rod 10 due to the upward constraint force of the second spring 142 of the support column 141 welded with the steel ball 13, and the position of the steel ball 13 relative to the driving rod 301 is controlled through the axial displacement of the transmission rod 10, a throttling channel is formed between the steel ball 13 and the valve port 301, and the sectional area of the throttling channel is reduced when the steel ball 13 moves upwards; when the steel ball 13 moves downwards, the sectional area of the throttling channel is increased, and the pressure change of the refrigeration working medium is different according to the difference of the sectional areas of the throttling channels, so that the control of the pressure of the refrigeration working medium is realized.
The working principle of the refrigerating system is as follows:
the refrigerant is boosted to supercritical pressure in the compressor 16, then enters the gas cooler 17 and is cooled by the cooling medium, in order to improve the performance of the system, the high-pressure gas after exiting the gas cooler 17 is further cooled in the internal heat exchanger 18, the heat exchange of the internal heat exchanger 18 is realized by low-temperature low-pressure steam in front of the return pipe of the compressor 16, then the pressure is reduced and throttled by the pressure control valve 21, the throttled gas is cooled, part of the gas is liquefied, and the wet steam enters the evaporator 19 to be vaporized, thereby absorbing the heat of the surrounding medium. Since the liquid in the evaporator 19 is not completely vaporized, but a small amount of liquid is left, a gas-liquid separator 20 is disposed between the evaporator 19 and the internal heat exchanger 18 to prevent the compressor 16 from liquid impact, and the low-pressure saturated steam from the gas-liquid separator 20 enters the low-pressure side passage of the internal heat exchanger 18, absorbs the heat of the high-temperature high-pressure supercritical gas, becomes superheated steam, enters the compressor 16 for boosting, and the cycle is repeated.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A pressure control valve for controlling a valve element opening degree using a sensing element, comprising:
the valve comprises a valve body (1) and a valve core (2), wherein the valve body (1) is provided with an inlet (101) and an outlet (102), a valve hole (3) is arranged on a communication pipeline of the inlet (101) and the outlet (102), the outer end of the valve hole (3) is provided with a valve port (301), and a steel ball (13) is placed at the valve port (301);
a bourdon tube (4) comprising a fixed end (401) and a free end (402), the fixed end (401) being in communication with the inlet (101);
it is characterized in that the preparation method is characterized in that,
the free end (402) of the Bourdon tube (4) is fixedly connected with the push block (5), the two sides of the push block (5) are respectively connected with a first slide bar (6) and a second slide bar (7), the other side of the first slide bar (6) is hinged with a gear transmission mechanism (8) which is used for converting elastic deformation of the Bourdon tube (4) into change of a rotation angle, and the other side of the second slide bar (7) is connected with a sliding mechanism (9) which is used for converting change of pressure of refrigerating working media of the inlet (101) into change of sectional area of a throttling channel so as to control the opening degree of the valve core.
2. The pressure control valve for controlling the opening degree of a valve core by using a sensing element as claimed in claim 1, wherein the gear transmission mechanism (8) comprises a driving gear (801) and a driven gear (802) engaged with the driving gear (801), a rotating shaft (803) is fixedly connected to the center of the driven gear (802), the sliding mechanism (9) comprises a guide groove (901), the guide groove (901) is slidably connected to one side of the second slide bar (7), the other side of the second slide bar (7) is elastically connected to a first spring (902), and the first spring (902) is arranged at the bottom of the guide groove (901).
3. The pressure control valve for controlling the opening degree of a valve core by using a sensing element according to claim 2, wherein a first transmission rod (10) is nested in the rotating shaft (803), the upper end of the first transmission rod (10) is fixedly connected with a gauge shaft (111) of a pressure gauge (11), a pointer (112) is mounted on the gauge shaft (111), and the lower end of the first transmission rod (10) extends to an outer end valve port (301) of a valve hole (3) communicating the inlet (101) and the outlet (102).
4. The pressure control valve for controlling the opening degree of the valve core by using the sensing element according to claim 1, further comprising a buffer mechanism (12) symmetrically arranged at two sides of the lower end portion of the first transmission rod (10), wherein the buffer mechanism (12) comprises a support plate (121), a first connecting rod (122) fixedly connected with the support plate (121), and a guide rod (123), the other end of the first connecting rod (122) is hinged with a second connecting rod (124), the guide rod (123) is sleeved with two corresponding support sleeves (125), the support sleeves (125) are fixedly connected with the other end of the second connecting rod (124), and a return spring (126) is arranged between the two support sleeves (125).
5. The pressure control valve for controlling the opening degree of the valve core by using the sensing element is characterized by further comprising a supporting mechanism (14) for supporting the steel ball (13), wherein the supporting mechanism (14) comprises a supporting column (141), a second spring (142) and a hollow screw (143), the steel ball (13) is welded at the upper end of the supporting column (141), the lower end of the supporting column (141) is fixedly connected to the second spring (142), the other end of the second spring (142) is arranged in the hollow screw (143), and the hollow screw (143) is fixed on the valve body (1) through threads.
6. The pressure control valve for controlling the opening degree of the valve core by using the sensing element as claimed in claim 5, wherein the two sides of the supporting column (141) are symmetrically provided with the wheel-moving mechanism (15), and the wheel-moving mechanism (15) comprises a second transmission rod (151) hinged on the supporting column (141) and a wheel disc (152) movably connected with the other side of the second transmission rod (151).
7. The pressure control valve for controlling the opening degree of a valve element by using a sensing element according to claim 1, wherein the first sliding rod (6) and the second sliding rod (7) are respectively embedded in the first sliding groove (601) and the second sliding groove (701) and slide in the first sliding groove (601) and the second sliding groove (701).
8. The pressure control valve for controlling the opening degree of a spool using a sensing element according to claim 2, wherein the driving gear (801) is a sector gear.
9. A pressure control valve for controlling the opening degree of a spool using a sensing element according to claim 3, wherein the rotation shaft (803) and the first transmission rod (10) are coaxial with the gauge shaft (111).
10. A refrigeration system comprising a compressor (16), a gas cooler (17), an internal heat exchanger (18), an evaporator (19), a gas-liquid separator (20), and a pressure control valve according to any one of claims 1 to 9 in which the opening degree of a valve element is controlled by a sensor element, the inlet of the gas cooler (17) communicates with the outlet of the compressor (16), the outlet communicates with the inlet of the high pressure side of the internal heat exchanger (18), an inlet (101) of the pressure control valve (21) communicates with a high-pressure side outlet of the internal heat exchanger (18), an outlet (102) communicates with an inlet of the evaporator (19), the inlet of the gas-liquid separator (20) is communicated with the outlet of the evaporator (19), the outlet is communicated with the inlet of the low-pressure side of the internal heat exchanger (18), the low pressure side outlet of the internal heat exchanger (18) communicates with the inlet of the compressor (16).
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