Temperature type expansion valve and refrigeration cycle system provided with same
阅读说明:本技术 温度式膨胀阀及具备该温度式膨胀阀的冷冻循环系统 (Temperature type expansion valve and refrigeration cycle system provided with same ) 是由 关谷到 大河原一郎 桥本和树 于 2020-03-09 设计创作,主要内容包括:本发明提供一种温度式膨胀阀,在从阀芯的开始打开至变成全开为止的期间内,能够可靠地抑制阀芯的振动。副室(20AU)形成于阀主体(20)的中间部(20B)中的阀口(20Va)的正下方且比连通路(20CP2)的开口端的位置靠上方的位置,并且形成为以中心位置(C1)为中心的近似圆形,该中心位置(C1)相对于主室(20AL)的中心位置(Co)朝向连通路(20CP2)的开口端偏心预定距离(δ)。(The invention provides a temperature type expansion valve, which can reliably restrain the vibration of a valve core in the period from the opening of the valve core to the full opening. The sub-chamber (20AU) is formed in a position immediately below the valve port (20Va) and above the position of the open end of the communication passage (20CP2) in the intermediate portion (20B) of the valve body (20), and is formed in an approximately circular shape centered on a center position (C1), the center position (C1) being eccentric by a predetermined distance () toward the open end of the communication passage (20CP2) with respect to a center position (Co) of the main chamber (20 AL).)
1. A temperature-type expansion valve is characterized by comprising:
a valve main body which is disposed in a pipe for supplying a refrigerant to an evaporator and has a flow path for guiding the refrigerant;
a valve body mechanism portion including a valve body, a biasing member, and a vibration-proof vane, wherein the valve body is disposed in a valve body housing portion of the valve body so as to be able to approach to or separate from a valve port of a valve seat formed in the flow path, the biasing member biases the valve body in a direction approaching the valve port of the valve seat, the vibration-proof vane is attached to the valve body and includes a plurality of abutting pieces, and the valve body mechanism portion controls an opening area of the valve port; and
a valve element mechanism driving unit disposed in the valve main body, for driving the valve element mechanism portion via a transmission shaft for operation linked with a diaphragm according to a pressure in an operating pressure chamber, wherein the operating pressure chamber is formed by the diaphragm and an outer contour member, and is supplied with a pressure in a temperature sensing portion disposed in a peripheral portion of an outlet of the evaporator,
the valve body includes a valve body having a valve port, a valve body housing portion, and a valve body portion, wherein the valve body housing portion includes a main chamber and a sub-chamber, the main chamber is formed on an axis shared with a central axis of the valve port and has an inner peripheral surface of a contact piece for guiding the vibration-proof vane, the sub-chamber is a sub-chamber communicating with the main chamber at a position directly below the valve port, is formed above an opening end communicating with an outlet of the flow path, and is formed around a position of the central axis eccentric with respect to a position of the axis of the main chamber such that a position of the central axis of the sub-chamber is close to the opening end communicating with the outlet of the flow.
2. A temperature type expansion valve according to claim 1,
the inner diameter of the sub-chamber having a circular cross section is set smaller than the inner diameter of the main chamber having a circular cross section.
3. A temperature type expansion valve according to claim 1,
the sub-chamber is formed above the main chamber.
4. A temperature type expansion valve according to claim 1,
the sub-chamber has a tapered portion that expands downward at a portion where an upper portion adjacent to the valve port is formed.
5. A refrigeration cycle system is characterized in that,
comprises an evaporator, a compressor and a condenser,
the thermal expansion valve according to any one of claims 1 to 4, which is provided in a pipe disposed between an outlet of the condenser and an inlet of the evaporator.
Technical Field
The present invention relates to a temperature type expansion valve and a refrigeration cycle system including the same.
Background
In the refrigeration cycle, a temperature expansion valve is used which controls the amount of refrigerant passing therethrough in accordance with a change in the temperature of the refrigerant discharged from an outlet of the evaporator. In such a temperature type expansion valve, for example, as shown in patent document 1, a valve for adjusting the flow rate of refrigerant passing through a valve port communicating with a valve chamber is provided in the valve chamber of a main body. The valve chamber communicates with a line communicating to the inlet via a valve port and communicates with a line communicating to the outlet. In such a valve, the valve is pressed in a direction away from the valve port via the pressure plate and the connecting rod in accordance with displacement of the diaphragm that partitions an upper pressure chamber and a lower pressure chamber formed in an upper portion of the main body communicating with the inside of the temperature sensing cylinder via the capillary tube, and the valve is biased in a direction approaching the valve port by the adjustment spring. The upper end surface of the connecting rod is in contact with the pressure plate, and the lower end surface of the connecting rod is in contact with the edge of the valve. In this configuration, the gas sealed in the temperature sensing cylinder expands, the pressure in the upper pressure chamber increases, and the diaphragm lowers, whereby the platen and the connecting rod lower. On the other hand, when the gas sealed in the temperature sensing cylinder contracts, the pressure in the upper pressure chamber decreases, and the diaphragm rises, whereby the platen and the connecting rod rise, the valve approaches the valve port by the biasing force of the adjusting spring, and the flow rate of the refrigerant passing through decreases.
As described above, in the thermal expansion valve in which the valve is supported by the adjustment spring, there is a case where the valve vibrates due to a fluctuation in fluid pressure or the like, thereby generating an unpleasant sound. In such a case, for example, as shown in patent document 2, in order to suppress the generation of unpleasant sound, a technique has been proposed in which a valve chattering preventing vane that slides in contact with an inner peripheral surface forming a valve chamber is fixed to a valve body by an upper spring seat and a lock nut.
Disclosure of Invention
Problems to be solved by the invention
In the refrigeration cycle described above, for example, in the temperature type expansion valve shown in patent document 1, the valve body repeatedly hits the periphery of the valve port due to pressure fluctuation of the refrigerant in the pipe caused by pulsation of the reciprocating compressor and turbulence caused by rapid expansion of the refrigerant after passing through the valve port, and thus, abnormal noise (vibration sound) may be generated. In such a case, a technique of further mounting a valve chatter preventing vane on the valve body as disclosed in patent document 2 is also considered. However, the valve chattering preventing vane may not reliably suppress the vibration of the valve body during a period from the start of opening of the valve body to the full opening.
In view of the above problems, it is an object of the present invention to provide a temperature type expansion valve and a refrigeration cycle including the same, in which vibration of a valve element can be reliably suppressed during a period from when the valve element starts to open to when the valve element becomes fully open.
Means for solving the problems
In order to achieve the above object, a temperature type expansion valve according to the present invention includes: a valve main body which is disposed in a pipe for supplying a refrigerant to an evaporator and has a flow path for guiding the refrigerant; a valve body mechanism unit including a valve body, a biasing member, and a vibration-proof vane, wherein the valve body is disposed in a valve body housing unit so as to be able to approach to or separate from a valve port of a valve seat formed in a flow path, the biasing member biases the valve body in a direction approaching the valve port of the valve seat, the vibration-proof vane is attached to the valve body and has a plurality of abutting pieces, and the valve body mechanism unit controls an opening area of the valve port; and a valve element mechanism driving unit which is arranged on the valve main body and drives the valve element mechanism part through a work transmission shaft linked with the diaphragm according to the pressure in the work pressure chamber, wherein the working pressure chamber is formed by a diaphragm and an outer contour member and is supplied with pressure in a temperature sensing part arranged at the periphery of an outlet of the evaporator, the valve core accommodating part of the valve main body comprises a main chamber and a sub chamber, wherein the main chamber is formed on an axis shared with a central axis of the valve port and has an inner peripheral surface of a contact piece for guiding the vibration-proof blade, the sub-chamber is a sub-chamber communicated with the main chamber at a position right below the valve port and is formed above a position of an opening end communicated with the outlet of the flow path, and is formed around the position of the central axis eccentric with respect to the position of the main chamber axis so that the position of the central axis of the sub-chamber is close to the open end communicating with the outlet of the flow path.
It is preferable that the inner diameter of the sub-chamber having a circular cross section is set smaller than the inner diameter of the main chamber having a circular cross section. Preferably, the sub-chamber is formed above the main chamber. Preferably, the sub-chamber has a tapered portion that expands in a downward direction at a portion where an upper portion adjacent to the valve port is formed.
The refrigeration cycle system of the present invention is characterized by comprising an evaporator, a compressor, and a condenser, wherein the thermal expansion valve is provided in a pipe arranged between an outlet of the condenser and an inlet of the evaporator.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the temperature type expansion valve and the refrigeration cycle including the same of the present invention, the sub-chamber communicates with the main chamber at a position directly below the valve port, is formed at a position above the position of the open end communicating with the outlet of the flow path, and is formed around the position of the central axis eccentric from the position of the axis of the main chamber so that the position of the central axis of the sub-chamber is close to the open end communicating with the outlet of the flow path, whereby the refrigerant flows into the sub-chamber, the flow rate of the refrigerant flowing toward the open end communicating with the outlet of the flow path is larger than the flow rate on the opposite side of the open end, and the fluid acting on the outlet end side of the valve body generates a larger force than the force on the opposite side of the open end, and therefore the valve body and the vibration isolating blade are urged in the opposite side of the open end, and the frictional force between the outer periphery of the working drive shaft and the inner periphery of the guide thereof and the frictional force between the As a result, the valve body can be reliably suppressed from vibrating during the period from the start of opening to the full opening of the valve body.
Drawings
Fig. 1 is a partially enlarged partial cross-sectional view of a main portion of an example of a temperature type expansion valve according to the present invention.
Fig. 2 (a) is a view showing a positional relationship between the sub-chamber and the main chamber as viewed from the direction indicated by the arrow IIA in fig. 1, and (B) is a view for explaining a flow passage area of the sub-chamber.
Fig. 3 is a sectional view showing a structure of an example of the temperature type expansion valve of the present invention.
Fig. 4 is a diagram for explaining a positional relationship between the center position of the sub-chamber and the center position of the main chamber in the example shown in fig. 1.
Fig. 5 is a cross-sectional view for explaining an operation in the example shown in fig. 3.
Fig. 6 is a diagram schematically showing a configuration of a refrigeration cycle to which an example of the temperature expansion valve of the present invention is applied.
Fig. 7 is a partial sectional view showing a main portion of another example of the valve main body used in the example shown in fig. 3.
Fig. 8 is a view showing a positional relationship between the sub-chamber and the main chamber as viewed from the direction indicated by the arrow VIII in fig. 7.
In the figure:
10-temperature type expansion valve, 12-valve core mechanism driving unit, 12D-diaphragm, 12F-pressure plate, 14-capillary tube, 16-temperature sensing cylinder, 18A-working transmission shaft, 20-valve main body, 20A-valve core containing chamber, 20AU, 20 'AU-auxiliary chamber, 20AL, 20' AL-main chamber, 22-valve core, 26-coil spring, 32-vibration-proof vane.
Detailed Description
Fig. 3 shows an example of the structure of the temperature type expansion valve of the present invention.
For example, as shown in fig. 6, the
In fig. 3, the
The valve
Inside the outer contour portion in the
As partially enlarged in fig. 1, the sub-chamber 20AU is formed in the
Eccentricity (0.075 to 0.15) × D1 (1)
For example, inner diameter D1 of main chamber 20AL and inner diameter D2 of sub-chamber 20AU are set according to the following equation (2).
D2/D1=0.7~0.85 (2)
In the above example, the sub-chamber 20AU is formed in an approximately circular shape centered on the center position C1, wherein the center position C1 is eccentric by a predetermined distance (eccentric amount) toward the open end of the communication path 20CP2 with respect to the center position Co of the main chamber 20AL, but the present invention is not limited to this example, and for example, the center position C1 of the sub-chamber 20AU may be set at a position in any direction within the area CA of the semicircular portion (oblique line portion) closer to the communication path 20CP2 shown in fig. 4 with respect to the center position Co of the
As partially enlarged in fig. 1, a
The
The
The
As shown in fig. 3, the valve core
The
The
The periphery of the
The
The
The working
In this configuration, when the refrigerant is supplied to the inlet port 20P1 and the communication passage 20CP1 of the valve
Thus, the force acting on the thin head portion 22PA of the
Fig. 7 shows a main part of another example of a valve main body used in the
In fig. 7, the same components as those in the example shown in fig. 1 are denoted by the same reference numerals, and redundant description thereof will be omitted.
The valve main body 20' is made of a metal material such as brass, and is composed of: a head portion (not shown) for fixing the valve body
Inside the outer contour portion of the intermediate portion 20 'B, a communication passage 20' CP1 communicating with the inlet port and a communication passage 20 'CP 2 communicating with the outlet port are formed so as to be orthogonal to the central axis Lo of the valve main body 20'. One end of the communication passage 20 ' CP1 opens to a valve port 20 ' Va of a valve seat 20 ' V forming a part of the sub chamber 20 ' AU of the valve body housing chamber 20 ' a. One end of the communication passage 20 ' CP2 opens into the main chamber 20 ' AL of the valve body housing chamber 20 ' a and faces the valve body 42.
The sub-chamber 20 'AU is formed in the intermediate portion 20' B immediately below the valve port 20 'Va and above the open end of the communication passage 20' CP 2. As shown in fig. 8, sub-chamber 20 ' AU is formed in an approximately circular shape centered on center position C1, where center position C1 is eccentric by a predetermined distance (eccentric amount) toward the open end of communication path 20 ' CP2 with respect to center position Co of main chamber 20 ' AL. A tapered portion 20 'AW that expands in the downward direction, that is, in the boundary portion with the main chamber 20' AL, is formed in a portion of the sub-chamber 20 'AU that forms an upper portion adjacent to the valve port 20' Va. The tapered portion 20 'AW intersects the central axis Lo of the valve body 20' at a predetermined taper angle α. The taper angle α is set to a taper angle of 45 ° or more and 60 ° or less, for example. At this time, the dimension HA from the upper surface adjacent to the valve port 20 'Va in the sub-chamber 20' AU intersecting the upper end of the tapered portion 20 'AW to the boundary portion with the main chamber 20' AL is set to 1/2 of the distance HB from the upper surface adjacent to the valve port 20 'Va in the above-described sub-chamber 20' AU to the projecting portion 42F of the valve body 42 held at a predetermined position, for example.
The valve body 42 is made of a metal material such as stainless steel, and is composed of: a thin head 42PA having a tip end inserted into the valve port 20' Va; an extension 42F which is in contact with the lower ends of the three working transmission shafts (connecting rods) 18A and extends outward from the hem of the thin head 42 PA; and an engagement end portion 42PB which is continuous with the protruding portion 42F and is formed on a central axis line common to the central axis line of the thin head portion 42 PA. The engagement end portion 42PB having an arc at the tip is inserted into the recess of the
In this configuration, the vibration damping effect of the contact piece of the
Therefore, in the above example, the
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