CN109469997B

CN109469997B - Refrigerating system and electronic expansion valve thereof

Info

Publication number: CN109469997B
Application number: CN201710798166.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2017-09-07
Filing date: 2017-09-07
Publication date: 2021-10-29
Anticipated expiration: 2037-09-07
Also published as: CN109469997A

Abstract

The invention provides an electronic expansion valve, which is characterized by comprising: a valve seat portion, wherein a first valve port (110a) is opened on the valve seat portion; a valve needle (107), wherein the valve needle (107) is fixedly connected with a valve seat core (117), and the valve seat core (117) can contact with or be far away from the first valve port (110a) to enable the first valve port (110a) to be in a closed state or an open state; a first silencing part (118) is fixedly arranged inside the valve seat core (117); the valve rod (106) is connected with the valve needle (107) in a floating mode, the valve rod (106) is provided with a valve rod cavity (1061), a second silencing part (114) is arranged in the valve rod cavity (1061), and a first opening part (106c) and a second opening part (106b) are formed in the valve rod (106); the first opening portion (106c) and the second opening portion (106b) are both communicated with the valve stem chamber (1061). According to the electronic expansion valve provided by the invention, no matter the refrigerant of the small-flow regulating part flows into the electronic expansion valve from any direction, the refrigerant must pass through a plurality of silencing elements, so that the turbulent flow and noise reduction of the refrigerant medium are realized, and the use comfort of a user is improved.

Description

Refrigerating system and electronic expansion valve thereof

Technical Field

The invention relates to the field of refrigeration, in particular to an electronic expansion valve for adjusting the flow of a refrigerant.

Background

In the technical field of refrigeration and heating, an electronic expansion valve is a refrigerant flow control component of refrigeration and heating equipment and mainly comprises two parts, wherein one part is a valve body part for flow regulation, and the other part is a coil part for driving. The working process is generally as follows: the screw rod is fixedly connected with the magnetic rotor and rotates along with the magnetic rotor to drive the valve needle to move, a nut component is arranged in the electronic expansion valve and is provided with an internal thread structure, correspondingly, the screw rod is provided with an external thread structure, the screw rod drives the valve needle to move up and down while rotating through the matching of a thread pair, and the flow of a refrigerant flowing through the valve port is regulated in a mode of regulating the opening degree between the valve needle and the valve port, so that the system function is realized and the aim of precise control is fulfilled.

Fig. 1 is an electronic expansion valve with a small flow regulation function in the background art. Wherein the coil part includes: the permanent magnet type stepping motor, the gear reducer with three-stage speed reduction and the screw pair structure for converting the rotary motion of the motor into the vertical motion of the screw rod are arranged. The valve body part comprises a valve seat 1, a valve rod 8, a valve needle 2, a stopping component 3 arranged between the valve rod 8 and the valve needle 2, a corrugated pipe 7 for controlling the lifting of the valve needle 2 and other core components. The valve seat 1 is provided with a first valve port 4, and the valve needle 2 has a closing position abutting against the first valve port 4 and an opening position opening the first valve port 4. The valve needle 2 and the valve rod 8 move synchronously when contacted by the stopping component 3, and the valve rod 8 can move up and down relative to the valve needle 2 when the valve needle 2 is positioned at the closing position. The valve needle 2 is provided with a second valve port 5 communicated with the first valve port 4 and a overflowing channel 9. The following describes several operating states of the electronic expansion valve: when the valve needle 2 is in the open position, the electronic expansion valve is in a fully open state. When the valve needle 2 is in the closed position and the valve rod 8 abuts on the second valve port 5, the fluid can only enter the valve needle 2 or flow out of the valve needle 2 through the flow passage 9, so that the electronic expansion valve is in a state of a fixed small flow (the flow is determined by the size of the flow passage). When small flow regulation is needed, the valve rod 8 moves upwards under the action of the bellows 7, and the flow is changed by the movement of the regulating valve rod 8, so that the small flow regulation is realized. When the valve rod 8 moves to a preset position, the stop component 3 arranged on the valve rod 8 contacts with the valve needle 2 to drive the valve needle 2 to move towards the direction far away from the first valve port 4, so that large-flow regulation is realized.

Above-mentioned electronic expansion valve structure, though have better little flow control function and noise reduction effect, nevertheless can further carry out structural design, when promoting its performance of making an uproar that falls, can also further promote user's comfort in use.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve and a refrigeration system with the same so as to further improve the noise reduction performance and the comfort level of users.

In order to achieve the above object, according to one aspect of the present invention, there is provided an electronic expansion valve comprising:

the valve comprises a valve seat part, a valve body and a valve body, wherein the valve seat part is provided with a first valve port;

the valve needle is fixedly connected with a valve seat core, and the valve seat core can contact or be far away from the first valve port so that the first valve port is in a closed or open state; a first silencing part is directly or indirectly fixedly arranged in the valve needle;

the valve rod is in floating connection with the valve needle, the valve rod is provided with a valve rod cavity, a second silencing part is arranged in the valve rod cavity, and a first opening part and a second opening part are formed in the side wall of the valve rod; the first opening portion and the second opening portion are both communicated with the valve stem cavity.

According to the electronic expansion valve provided by the invention, no matter the refrigerant of the small-flow regulating part flows into the electronic expansion valve from any direction, the refrigerant must pass through a plurality of silencing elements, so that the turbulent flow and noise reduction of the refrigerant medium are realized, and the use comfort of a user is improved.

In order to further obtain better technical effects, the following modifications or further limitations can be made on the basis of the technical scheme:

the valve seat core is provided with a second valve port, and the valve rod can contact or be far away from the second valve port, so that the second valve port is in a closed or open state.

The valve is characterized in that a valve needle limiting surface is arranged on the valve needle, a convex part is arranged on the valve rod, a valve rod limiting surface is arranged on the convex part, and the valve needle limiting surface and the valve rod limiting surface are arranged oppositely.

And a first spring is arranged in the valve rod, one end of the first spring is abutted against the lower end of the convex part, and the other end of the first spring is abutted against the valve seat core.

The valve seat portion is fixed with the guide, the outer marginal part fixedly connected with retaining ring of valve rod, the retaining ring with be provided with the second spring between the guide.

The guide piece is provided with a bottom and a through hole arranged in the center of the bottom, and an opening flow channel is arranged at the inner edge of the through hole.

The valve comprises a valve seat part and a valve cavity silencing part, wherein the valve cavity silencing part is fixedly connected in a cavity formed by the valve seat part, is arranged on one side far away from a first connecting pipe and is arranged opposite to the first connecting pipe.

The bottom of valve pocket noise elimination portion is provided with the step portion, be provided with the constant head tank on the valve seat portion, the step portion is installed in the constant head tank, in order to fix valve pocket noise elimination portion.

The valve rod is provided with a through small hole.

The columnar porous noise reduction material is arranged in the valve rod, so that the noise reduction and flow disturbance action length can be increased, and the processing is convenient. And set up the water conservancy diversion passageway on the guide, through porous amortization spare for the cold medium matter of circulation obtains the vortex again after the flow direction adjustment and falls the noise, has further promoted the effect of falling the noise.

According to another aspect of the present invention, there is provided a refrigeration system comprising: the electronic expansion valve is the electronic expansion valve. Obviously, when the electronic expansion valve with the above technical effects is applied to a refrigeration system, the refrigeration system obviously also has the above technical effects.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a partial longitudinal cross-sectional structure of an electronic expansion valve in the related art;

FIG. 2 is a schematic diagram of an embodiment of an electronic expansion valve according to the present invention;

FIG. 3 is an enlarged schematic view of part A of FIG. 2;

FIG. 4 shows a schematic view of a guide construction according to an embodiment of the invention;

FIG. 5 is a schematic view showing the fitting structure of the silencing part of the valve cavity according to the embodiment of the invention;

FIG. 6 is a schematic view of a silencing part of the valve cavity according to the embodiment of the invention;

fig. 7 shows a schematic view of a valve stem configuration according to another embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 2, the electronic expansion valve of the present embodiment includes a valve seat 109, a housing 104 fixed on the valve seat 109, and a base 110 disposed at the bottom of the valve seat 109 and fixed in a sealing manner with the valve seat 109. The valve seat 109 and the seat 110 form a valve seat portion. Of course, as an alternative embodiment, the valve seat 109 and the base 110 may be made of a single material. The valve seat 109, the housing 104 and the base 110 enclose a space which is relatively isolated from the outside. A first connection pipe 111a is connected to a sidewall of the valve seat 109, a second connection pipe 111b is connected to a bottom of the base 110, and the base 110 is provided with a first port 110 a. Thus, the refrigerant may flow from the first connection pipe 111a into the second connection pipe 111b through the first port 110a, or may flow from the second connection pipe 111b to the first connection pipe 111a through the first port 110a in the opposite direction.

In a space enclosed by the housing 104 and the valve seat 109, a rotor 101 that rotates in response to an urging force of an electromagnetic coil (not shown), a gear reduction mechanism 102 that increases an output torque, and a screw 103 that serves as a power transmission are provided. The rotor 101 is driven by the electromagnetic coil to rotate, which drives the gear reduction mechanism 102 to rotate and drives the screw 103 to rotate. Inside the space, a guide 108 and a nut 105 fixed to the guide 108 are also provided. The nut 105 has an internal thread and, correspondingly, the screw 103 is provided with an external thread, so that, when the screw 103 is rotated, the screw 103 is rotated while being lifted due to the thread pair. The valve rod 106 and the valve needle 107 can be driven to move up and down.

It should be noted that, in the present embodiment, the gear reduction mechanism 102 is provided, but of course, the screw 103 may be directly connected to the rotor 101 without providing the gear reduction mechanism 102, that is, the rotor 101 directly drives the screw 103 to rotate. Those skilled in the art will appreciate that such a configuration in which the rotor directly rotates the lead screw is common in the background art.

The needle 107 has a substantially hollow cylindrical structure, and a seat core 117 is fixedly connected to the bottom of the needle 107 with reference to the orientation shown in the drawing, and the lower end of the seat core 117 is used to contact the first port 110a and close the first port 110 a. That is, when the needle 107 moves down to the limit position, the valve seat core 117 contacts the first port 110a, so that the refrigerant fluid cannot directly flow from the first connection pipe 111a into the second connection pipe 111b through the first port 110a, and conversely, the refrigerant cannot directly flow from the second connection pipe 111b into the first connection pipe 111a through the first port 110 a.

The upper end of the valve seat core 117 further opens a second valve port 117a, and the valve stem 106 partially disposed inside the valve needle 107 may contact the second valve port 117a to close the second valve port 117a, or the valve stem 106 may be away from the second valve port 117a to open the second valve port 117 a. Thus, a small flow rate adjusting portion is formed between the valve stem 106 and the second valve port 117 a. A first sound deadening member 118 is further provided between the second port 117a and the lower end portion of the seat core 117, and specifically, as in the present embodiment, a cavity for placing a sound deadening member is provided in the seat core 117, and the cavity communicates with the second port 117a provided in the seat core 117 and also communicates with the outside of the seat core 117. The cavity may be cylindrical or rectangular, and the first muffler member 118 is placed in the cavity, and then the bottom portion of the seat core 117 is deformed by caulking, pressure-bonding, or the like, thereby fixing the first muffler member 118 in the cavity and forming the seat core opening portion 117 b. Since the cavity and the second port 117a penetrate the valve seat core 117, when the second port 117a is in an open state, even if the valve seat core 117 moves down to a limit position, the refrigerant can still flow into the cavity inside the valve seat core 117 through the second port 117a, pass through the first silencing part 118 in the cavity, be silenced, and then flow out from the lower end of the valve seat core 117 when the first port 110a is in a closed state by being in contact with the first port 110 a.

The valve rod 106 and the valve needle 107 are connected in a floating manner, that is, the valve rod 106 can move up and down relative to the valve needle 107, but the valve rod 106 cannot be completely separated from the valve needle 107 during the operation of the electronic expansion valve. The term "completely disengaged" as used herein refers to a situation where "no part of the valve stem 106 is physically located inside the valve needle 107". In order to achieve a floating connection, a needle stop surface 107b is provided on the needle 107, and a valve stem stop surface 106d is provided on the valve stem 106, as shown in fig. 3. The valve needle limiting surface 107b and the valve rod limiting surface 106d are oppositely arranged, and the maximum distance between the two limiting surfaces can be preset according to actual needs. The bottom of the valve stem 106 is provided with a sealing portion 106a, in this embodiment, the sealing portion 106a is a tapered surface, and when the valve stem 106 moves downward to the limit position, the sealing portion 106a contacts with the second valve port 117a, so that the second valve port 117a is in a closed state. Obviously, when the valve rod 106 moves upward so that the needle stopper surface 107b abuts against the valve rod stopper surface 106d, the second valve port 117a is in the state shown in fig. 3 when the opening degree adjustment is maximum; when the valve rod 106 moves downward so that the sealing portion 106a abuts against the second valve port 117a, the opening of the second valve port 117a is adjusted to the minimum. The needle stopper surface 107b is not limited to the valve needle 107 described in the embodiment and the valve rod stopper surface 106d is not limited to the valve rod 106 described in the embodiment and may be formed by combining parts by those skilled in the art based on the present design concept.

A first spring 119 is disposed between the valve stem 106 and the valve seat core 117. In order to facilitate the arrangement of the first spring 119 and the arrangement of the valve rod limiting surface 106d, in the present embodiment, a protruding protrusion 1063 may be provided on the circumferential outer edge of the valve rod 106, and the protrusion 1063 may be completely continuous in the circumferential direction or discontinuous in the circumferential direction. Those skilled in the art will understand that even in a discontinuous state, the upper end surface of the protrusion 1063 may be the valve stem stopper surface 106d for abutting against the valve needle stopper surface 107 b; the lower end surface of the protrusion 1063 may still be used to abut against the upper end of the first spring 119. The valve needle 107 is configured to bring the first port 110a into a closed state by the first spring 119, and the valve stem 106 is vertically displaced by the driving force transmitted from the first spring 119 and the electromagnetic coil to adjust the opening degree, thereby realizing the valve opening flow rate adjustment of the small flow rate adjustment member. Meanwhile, since the outer diameter of the protrusion 1063 is larger than the inner diameter of the upper end opening of the needle 107, the valve stem 106 cannot be detached from the needle 107.

In order to further improve the noise reduction effect, the inside of the valve stem 106 is also hollow to form a stem cavity 1061, and a second noise reduction member 114 is provided inside the stem cavity 1061, and a first opening 106c is opened in a side wall of the valve stem 106 so that fluid can flow into the stem cavity 1061. The sidewall is conveniently provided with an opening, and certainly not limited to the opening on the sidewall of the valve rod 106 in this embodiment, and those skilled in the art can understand that the opening may be provided at any suitable position of the valve rod 106, so that the inner cavity of the valve rod 106 can be communicated with the outside. The top of the valve rod 106 is fixedly connected with a transmission part 1062 for transmitting the driving force of the screw rod 103. In the present embodiment, the transmission part 1062, the valve rod 106 and the protrusion 1063 thereof, and the second silencing part 114 together constitute a valve rod assembly. During assembly, the second silencing component 114 may be placed in the stem cavity 1061 of the valve stem 106, and then the transmission 1062 may be fixed to the valve stem 106 to form a valve stem assembly. The valve stem assembly is then installed into the valve needle 107 from below, the first spring 119 is installed, and then the valve seat core 117 is fixed below the valve stem 107.

A retainer ring 112 is fixedly connected to the outer edge of the valve stem 106 at a portion located outside the valve needle 107, and a second spring 113 is provided between the retainer ring 112 and the guide 108 fixed to the valve seat 109, that is, one end of the second spring 113 abuts against the lower surface of the retainer ring 112 and the other end abuts against the guide 108. The outer edge of the valve stem 106 is further provided with a second opening 106 b. Similarly, the opening position of the second opening 106b is not limited to the side wall of the valve stem 106 described in the embodiment, and the second opening 106b may be provided so as to allow conduction between the inside and the outside of the valve stem 106.

As shown in fig. 4, the guiding element 108 is substantially hollow and cylindrical, and has a sidewall fixed to the valve seat 109, a bottom 108b and a through hole 108c opened in the center of the bottom 108b, wherein the through hole 108c has an inner diameter matched with the outer diameter of the valve needle 107, so that the guiding element 108 can guide the valve needle 107 when the valve needle is displaced up and down. An open flow passage 108a is further provided at an inner edge portion of the through hole 108c of the guide for circulation of the refrigerant.

A valve cavity sound-deadening portion 115 is fixedly connected to a cavity formed by the valve seat 109 and the base 110, and the valve cavity sound-deadening portion 115 is disposed on a side away from the first connection pipe 111a, i.e., disposed opposite to the first connection pipe 111a, as shown in fig. 5. In order to mount the valve chamber sound-deadening portion 115 into the valve seat 109, in one arrangement provided in the present embodiment, a stepped portion 115a is provided at the bottom of the valve chamber sound-deadening portion 115, as shown in fig. 6. Accordingly, the positioning groove is formed on the base 110, so that the step portion 115a is fitted into the positioning groove, thereby fixing the valve chamber noise reduction portion 115 to the base 110. Of course, the step portion 115a is not limited to be disposed at the bottom of the valve cavity sound-deadening portion 115, and may be disposed at the top, the side, or other manners, and those skilled in the art may make several equivalent alternatives based on the technical teaching of the present invention.

Thus, when the refrigerant flows in from the first connecting pipe 111a, passes through the valve chamber silencing part 115 for silencing, then passes through the opening flow passage 108a of the guide 108, flows to the second opening 106b, passes through the second silencing part 114 for silencing, and then flows into the inner expansion chamber 107e of the needle 107 (i.e., the chamber enclosed between the needle 107 and the valve seat core 117) from the first opening 106 c; the refrigerant is dispersed in the silencing part made of the porous part, bubbles in the fluid are greatly dispersed, and noise generated in the dispersion process is absorbed by the porous silencing part, so that the silencing and noise reduction of the refrigerant flowing into the porous part are realized. After the refrigerant passes through the second port 117a, the refrigerant is disturbed and reduced in noise by the first silencing part 118, and finally flows to the second connecting pipe 111 b.

When the refrigerant flows in from the valve seat core opening 117b, the bubbles existing in the fluid are greatly disturbed by the dispersion and impact process of the first muffler 118, and the noise generated in the disturbance process is absorbed by the porous first muffler 118, thereby achieving the noise reduction of the inflow refrigerant. The refrigerant flows into the inner expanding cavity 107e of the valve needle 107 through the second valve port 117a, passes through the first opening 106c, is subjected to noise reduction by the second noise reduction part 114, and then flows out through the second opening 106 b; then, the flow passes through the open flow passage 108a of the guide member 108, and the valve chamber sound-deadening portion 115 is silenced and flows out. The bubbles in the fluid are further disturbed and reduced in noise by the action of several noise reduction components.

While the technical solutions of the present application have been described in detail by taking a specific embodiment as an example, it should be noted that various changes, modifications, etc. of technical features may be made to the specific embodiment according to various practical requirements.

When the second port 117a is in a fully closed state, if the system needs to have a certain fixed small flow rate in the closed state, a through small hole 106e may be provided on the valve stem 106, as shown in fig. 7. The diameter of the small hole 106e can be designed as required. Of course, those skilled in the art will appreciate that the implementation of the fixed small flow rate is not limited to the valve rod 106 having a small hole therethrough, but may be implemented by forming a flow channel in the second valve port 117a, so that the refrigerant can still flow out of the flow channel even when the second valve port 117a is completely closed. The fixed low flow rate can also be shut off by notching the seal 106a of the valve stem 106; alternatively, a small hole may be provided directly in the valve seat insert 117. It will be appreciated by those skilled in the art that various equivalent substitutions for a fixed small flow rate may be made in light of the above teachings, and such equivalent substitutions are intended to fall within the scope of the present application.

The terms of orientation such as up, down, left and right in the text of this specification are based on the state shown in the corresponding drawings, and should not be construed as limiting the technical solutions of the present application.

Embodiments of a refrigeration system according to the present application include an electronic expansion valve. Wherein, the electronic expansion valve is the electronic expansion valve. Because the electronic expansion valve has the advantage of accurate flow regulation, the refrigeration system with the electronic expansion valve also has the advantage.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

a valve seat portion, wherein a first valve port (110a) is opened on the valve seat portion;

a valve needle (107), wherein the valve needle (107) is fixedly connected with a valve seat core (117), and the valve seat core (117) can gradually contact with or be away from the first valve port (110a) to enable the first valve port (110a) to be in a gradually closed or gradually opened state; a first silencing part (118) is directly or indirectly fixedly arranged inside the valve needle (107);

a valve rod (106) connected with the valve needle (107) in a floating manner, wherein the valve rod (106) is provided with a valve rod cavity (1061), a second silencing part (114) is arranged in the valve rod cavity (1061), and the valve rod (106) is provided with a first opening part (106c) and a second opening part (106 b); the first opening portion (106c) and the second opening portion (106b) both communicate with the valve stem chamber (1061);

the valve needle (107) includes an inner expansion chamber (107e), and the first opening portion (106c) communicates with the inner expansion chamber (107 e); a guide (108) is fixed to the valve seat portion, an opening flow channel (108a) is provided in the guide (108), and the second opening portion (106b) communicates with the opening flow channel (108 a).

2. The electronic expansion valve according to claim 1, wherein the valve seat core (117) defines a second valve port (117a), and the valve rod (106) can gradually contact or move away from the second valve port (117a) to make the second valve port (117a) in a gradually closed or gradually opened state.

3. An electronic expansion valve according to claim 2, wherein the valve needle (107) is provided with a valve needle limiting surface (107b), the valve rod (106) is provided with a protrusion (1063), the protrusion (1063) is provided with a valve rod limiting surface (106d), and the valve needle limiting surface (107b) and the valve rod limiting surface (106d) are oppositely arranged.

4. An electronic expansion valve according to claim 3, wherein a first spring (119) is arranged inside the valve rod (107), one end of the first spring (119) abutting against the lower end of the protrusion (1063), the other end of the first spring (119) abutting against the valve seat core (117).

5. An electronic expansion valve according to claim 1, wherein a retainer ring (112) is fixedly attached to an outer edge portion of the valve stem (106), and a second spring (113) is arranged between the retainer ring (112) and the guide member (108).

6. An electronic expansion valve according to claim 5, wherein the guide member (108) has a bottom portion (108b) and a through hole (108c) opened in the center of the bottom portion (108b), and the open flow passage (108a) is provided in an inner edge portion of the through hole (108 c).

7. The electronic expansion valve according to claim 1, wherein a valve chamber sound-deadening portion (115) is fixedly connected to a chamber formed by the valve seat portion, and the valve chamber sound-deadening portion (115) is disposed on a side away from the first connection pipe (111a) and is disposed opposite to the first connection pipe (111 a).

8. An electronic expansion valve according to claim 7, wherein the valve chamber sound-deadening portion (115) is provided with a step portion (115a) provided with a positioning groove, the step portion (115a) being mounted in the positioning groove to fix the valve chamber sound-deadening portion (115).

9. An electronic expansion valve according to claim 1, wherein the valve stem (106) is provided with an aperture (106e) therethrough, the aperture (106e) communicating the valve stem chamber (1061) with the second valve port (117 a).

10. A refrigeration system comprising: an electronic expansion valve according to any of claims 1 to 9.