CN110686085A

CN110686085A - Valve and device provided with valve

Info

Publication number: CN110686085A
Application number: CN201910157670.7A
Authority: CN
Inventors: 铃木启爱; 小岛舜介
Original assignee: Hitachi Global Life Solutions Inc
Current assignee: Hitachi Global Life Solutions Inc
Priority date: 2018-07-06
Filing date: 2019-03-01
Publication date: 2020-01-14
Anticipated expiration: 2039-03-01
Also published as: CN110686085B; JP6966387B2; JP2020007950A

Abstract

The invention provides a valve, which improves the characteristics of the valve. The valve includes a spring reed that is positioned on the opposite side of the head with the valve element interposed therebetween and has a flexible portion that can come into contact with the valve element, and a stopper that is positioned on the opposite side of the valve element with the spring reed interposed therebetween, wherein the spring reed includes a head contact portion that comes into contact with the head, a stopper contact portion that comes into contact with the stopper, and a coupling portion that couples the head contact portion and the stopper contact portion, respectively, on both end sides of the flexible portion.

Description

Valve and device provided with valve

Technical Field

The present invention relates to a valve and an apparatus provided with the valve.

Background

As an actual valve used for suction and discharge of a fluid in a compressor or the like, a valve whose stiffness varies depending on a pressure is used as a coefficient, and a substantially linear relationship is established between the pressure and an opening degree. However, ideally, a valve that instantaneously switches between an opening degree of 0 and a large value (becomes a step function) with a certain pressure as a boundary is desired.

Patent document 1 includes a discharge reed 40 having a boss 41, and a spring reed 43 having a bent portion 42 that presses the boss 41. The spring reed 43 presses the discharge reed 40 only by the bent portion 42 and is fixed to the valve plate 15. The front end 48 of the spring reed 43 is fitted in the recess 21 of the valve plate 15 (paragraph 0019 and 0021, fig. 5). The spring constant of the discharge valve can be read as the differential coefficient of fig. 12.

Documents of the prior art

Patent document 1: japanese laid-open patent publication No. 10-259784

Disclosure of Invention

Problems to be solved by the invention

In the discharge valve of patent document 1, when the opening of the discharge valve is started, only the discharge reed 40 operates to realize a low spring constant, and when the discharge reed 40 and the spring reed 43 come into contact with each other, the combined spring of the discharge reed 40 and the spring reed 43 is obtained, and thus the spring constant changes to a high spring constant.

However, in the spring reed 43 of patent document 1, the tip end portion 48 is merely fitted into the recess 21, and therefore, the spring reed 43 has a so-called cantilever structure, and the spring constant thereof is low. Further, since the recess 21 is usually provided in the metal valve plate 15, it is difficult to support the tip end portion 48 by reducing the size of the recess 21 after the tip end portion 48 is inserted (fitted) into the recess 21 in the structure of patent document 1.

Means for solving the problems

In view of the above circumstances, a first invention of a valve includes:

a valve core;

a head portion having a recess portion in which the valve element is disposed;

a spring reed which is located on the opposite side of the head portion with the valve element interposed therebetween and has a flexible portion capable of contacting the valve element; and

a stopper located on the opposite side of the valve element with respect to the spring reed,

the above-mentioned valve is characterized in that,

the spring reed includes, on both end sides of the flexible portion:

a head contact portion which is in direct or indirect contact with the head;

a stopper contact portion that is in direct or indirect contact with the stopper; and

and a connecting portion connecting the head contact portion and the stopper contact portion.

In view of the above circumstances, a valve according to a second aspect of the present invention includes:

a valve core;

a head portion having a recess portion in which the valve element is disposed;

the above-mentioned valve is characterized in that,

the spring reed has a double support structure supported by the head or the valve element on one side of the spring reed and the stopper on the other side.

Drawings

Fig. 1 is a longitudinal sectional view of a hermetic compressor of the embodiment.

Fig. 2 is an exploded perspective view of the head of the embodiment.

Fig. 3 is a longitudinal sectional view of the head of the embodiment.

Fig. 4 is a longitudinal sectional view of the head portion when the valve element displacement amount of the embodiment is large.

Fig. 5 is a diagram showing the spring characteristics of the valve element of the embodiment.

In the figure:

1-head cover, 2-head, 21-recess, 22-discharge valve seat, 23-discharge hole, 40-valve element, 401-lug, 402-main face, 43-spring reed, 431-lug pressing portion (head contact portion), 432-supported portion, 4321-first inclined portion, 4322-first parallel portion (stopper contact portion), 4323-second inclined portion (coupling portion), 4324-second parallel portion (head contact portion), 433-mounted portion, 434-flexible portion, 435-lug pressing coupling portion (stopper contact portion and coupling portion), 436-lug pressing side inclined portion, 53-open end, 54-cylinder, 55-piston, 62-stopper, 7-cylinder.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same components are denoted by the same reference numerals, and the same description will not be repeated.

The various components of the present invention are not necessarily independent of each other, and for example, a case where one component is configured by a plurality of members, a case where a plurality of components is configured by one member, a case where a part of a certain component overlaps with a part of another component, or the like is allowed.

Fig. 1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention. The hermetic compressor has a compression element 52 elastically supported in a hermetic container 51. The compression unit 52 includes a cylinder 54 having a cylinder tube 7, a head 2 closing an opening end 53 of the cylinder tube 7, a piston 55 accommodated from the opposite side of the opening end 53, a connecting rod 57 connecting the piston 55 and a crankshaft 56, and a motor 58 rotating the crankshaft 56.

Fig. 2 is an exploded perspective view of the head 2 of the embodiment. On the discharge side of the head 2, a valve body 40, a spring reed 43, and a stopper 62 are arranged in order from the near side to the far side from the head 2.

The discharge side of the head portion 2 has a recess 21, a discharge hole 23 disposed in the recess 21, and a discharge valve seat 22 disposed around the discharge hole 23.

The valve body 40 has a boss 401 on one end side in the longitudinal direction and a main surface 402 on the other end side in the longitudinal direction. The lug 401 is a portion extending in a direction substantially orthogonal to the longitudinal direction. The main surface 402 is a flat plate-like portion that opens and closes the discharge hole 23 (seals or opens the discharge valve seat 22).

The spring reed 43 has a boss pressing portion 431, a supported portion 432 and a mounted portion 433 that mount the spring reed 43 to the recess 21, a flexible portion 434 located between the boss pressing portion 431 and the supported portion 432, a boss pressing connection portion 435 connected to the boss pressing portion 431, and a boss pressing-side inclined portion 436 located between the boss pressing connection portion 435 and the flexible portion 434.

In the state where the head 2 is assembled, the boss pressing portion 431 is a portion on the boss pressing portion 431 side that supports the flexible portion 434 by bringing the boss 401 into contact with the recess 21 and pressing the recess 21, and the supported portion 432 is a portion on the supported portion 432 side that supports the flexible portion 434 by being sandwiched between the recess 21 and the stopper 62. The attached portion 433 is a portion that is inserted into a slit (not shown) provided in the outer edge of the recess 21 and suppresses the spring reed 43 from being excessively displaced toward the stopper 62. The flexible portion 434 is a flat plate-like portion extending from between the two lug pressing portions 431 (one end side) to the supported portion 432 side (the other end).

The stopper 62 is a member that is fixed to the recess 21 in a state where the head 2 is assembled, and in a state where the stopper contacts the boss pressing portion 431 and the supported portion 432, and does not contact the flexible portion 434.

Fig. 3 is a longitudinal sectional view of the head 2 of the embodiment, and is a longitudinal sectional view of a line a-a of fig. 2. Fig. 4 is a longitudinal sectional view of the head portion 2 when the valve element displacement amount is large in the embodiment, and fig. 5 is a diagram showing the spring characteristic of the discharge valve in the embodiment.

The supported portion 432 includes, from the flexible portion 434 side, a first inclined portion 4321, a first parallel portion 4322, a second inclined portion 4323, and a second parallel portion 4324.

The first inclined portion 4321 is a portion having one end connected to the flexible portion 434 and inclined toward the other end toward the side close to the recess 21, and preferably contacts the stopper 62. One end of the first parallel portion 4322 is connected to the other end of the first inclined portion 4321, preferably extends in a direction substantially parallel to the stopper 62, and contacts the stopper 62. The second inclined portion 4323 is a portion having one end connected to the first parallel portion 4322 and inclined toward the other end to a side close to the recess 21. One end of the second parallel portion 4324 is connected to the other end of the second inclined portion 4323, extends substantially parallel to the recess 21, and contacts the recess 21.

In this way, the supported portion 432 is effectively supported by the stopper 62 by having a portion in contact with the recess 21 and a portion in contact with the stopper 62, and a portion connecting the two points. This can support the other end of the flexible portion 434, and can harden the flexible portion 434. As in the present embodiment, it is preferable that the

parallel portions

4322 and 4324 contact the recess 21 and the stopper 62, respectively, because the contact area with the recess 21 and the stopper 61 can be secured.

Further, although not clear from fig. 3, the boss pressing portion 431 side of the spring reed 43 contacts the stopper 62. The lug pressing connecting portion 435 is preferably in contact with the stopper 62, and the lug pressing-side inclined portion 436 is also preferably in contact with the stopper 62. That is, the spring reed 43 indirectly contacts the recess 21 with the boss 401 interposed therebetween by the boss pressing portion 431. Therefore, the spring reed 43 also has a portion that contacts the recess 21, a portion that contacts the stopper 62, and a portion that connects these portions on the side of the boss pressing portion 431.

Fig. 5 is a graph showing the relationship between the displacement amount of the discharge-side valve and the load (discharge pressure) in the present embodiment. Since the valve body 40, the spring reed 43, and the stopper 62 have the above-described configuration, the spring constant of the flexible portion 434 of the present embodiment has a large value because of the so-called double support. That is, the spring reed 43 is a double support structure that is in contact with the head 2 or the valve element 40 on one side in the opening/closing direction of the valve element 40 and is sandwiched in contact with the stopper 62 on the other side. Therefore, the spring constant when the valve body 40 starts to open (the displacement amount is small, and is a degree that the main surface 402 does not contact the flexible portion 434) is low, and then becomes a combined spring of the flexible portion 434 and the spring reed 43, and the spring constant becomes high.

Claims

1. A valve, having:

a valve core;

a head portion having a recess portion in which the valve element is disposed;

a spring reed that is positioned on the opposite side of the head portion with the valve element interposed therebetween and has a flexible portion that the valve element can contact; and

the above-mentioned valve is characterized in that,

the spring reed includes, on both end sides of the flexible portion:

a head contact portion which is in direct or indirect contact with the head;

2. The valve of claim 1,

the spring reed has a structure on one end side of the flexible portion, the structure including:

a first inclined portion having one end connected to the flexible portion and inclined toward the other end toward a side close to the head portion;

a first parallel portion as a portion having one end connected to the other end of the first inclined portion, extending in a direction substantially parallel to the stopper, and contacting the stopper;

a second inclined portion, one end of which is connected to the first parallel portion and which is inclined toward the other end toward a side close to the head portion; and

and a second parallel portion having one end connected to the other end of the second inclined portion, extending substantially parallel to the head portion, and contacting the head portion.

3. A valve, having:

a valve core;

a head portion having a recess portion in which the valve element is disposed;

the above-mentioned valve is characterized in that,

the spring reed has a double support structure in which the head or the valve element on one side of the spring reed is supported by the stopper on the other side.

4. An apparatus, characterized in that it comprises,

having a valve as claimed in any one of claims 1 to 3.